WO2015166610A1 - 1液湿気硬化型ポリウレタン組成物 - Google Patents
1液湿気硬化型ポリウレタン組成物 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy groups
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4804—Two or more polyethers of different physical or chemical nature
- C08G18/4812—Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4829—Polyethers containing at least three hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/6715—Unsaturated monofunctional alcohols or amines
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/73—Polyisocyanates or polyisothiocyanates acyclic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
- C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/78—Nitrogen
- C08G18/7806—Nitrogen containing -N-C=0 groups
- C08G18/7818—Nitrogen containing -N-C=0 groups containing ureum or ureum derivative groups
- C08G18/7831—Nitrogen containing -N-C=0 groups containing ureum or ureum derivative groups containing biuret groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/78—Nitrogen
- C08G18/7875—Nitrogen containing heterocyclic rings having at least one nitrogen atom in the ring
- C08G18/7893—Nitrogen containing heterocyclic rings having at least one nitrogen atom in the ring having three nitrogen atoms in the ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/78—Nitrogen
- C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
- C08G18/791—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups
- C08G18/792—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing isocyanurate groups formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/80—Masked polyisocyanates
- C08G18/8003—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen
- C08G18/8006—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen with compounds of C08G18/32
- C08G18/8009—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen with compounds of C08G18/32 with compounds of C08G18/3203
- C08G18/8022—Masked polyisocyanates masked with compounds having at least two groups containing active hydrogen with compounds of C08G18/32 with compounds of C08G18/3203 with polyols having at least three hydroxy groups
- C08G18/8025—Masked aliphatic or cycloaliphatic polyisocyanates
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/08—Polyurethanes from polyethers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
Definitions
- the present invention relates to a one-component moisture-curable polyurethane composition.
- urethane resin compositions have been widely used as sealing agents, adhesives and the like.
- a urethane resin composition a two-component type composed of a polyol compound and an isocyanate compound and a one-component type composition that is cured by moisture in the air are known.
- the use of a one-component moisture-curable polyurethane composition is expanding in that it does not require mixing adjustment of the composition and is easy to handle.
- Patent Document 1 states that “an isocyanate silane compound which is a reaction product of a compound having at least three isocyanate groups obtained by reacting trimethylolpropane and a diisocyanate compound and a secondary aminosilane having a specific structure, and urethane.
- 1-component moisture-curing polyurethane composition containing a prepolymer ([Claim 1]).
- Patent Document 2 and Patent Document 3 describe a preliminary composition comprising a predetermined urethane prepolymer, a filler, and a plasticizer, as follows: “Equivalent ratio of NCO group and OH group by adding bifunctional isocyanate to trimethylolpropane.
- Compound (A) obtained by reacting so that the equivalent ratio of is 1.8 to 3.5 ”,“ isocyanurate body of bifunctional isocyanate, burette body, and bifunctional isocyanate and triol are reacted.
- a compound having an imino group in which an aryl group is directly bonded to a nitrogen atom and at least one compound selected from the group consisting of compounds and having a hydrolyzable silyl group A compound (B) obtained by reacting so that the equivalent ratio of CO group and NH group is 1.8 to 3.5, and “isocyanurate body, burette body of bifunctional isocyanate, and bifunctional isocyanate;
- One-component moisture-curable urethane compositions containing at least one compound (C) selected from the group consisting of compounds obtained by reacting with triols, and “organotin compounds” are described (each patent) [Claim 1]) of the literature.
- Patent Document 3 describes a one-component moisture-curable urethane composition that uses “dimorpholinodiethyl ether” and “N, N-dimethylaminoethylmorpholine” together with an organotin compound ([[ Claim 1]).
- Patent Document 4 discloses that “the urethane prepolymer (A) is selected from the group consisting of a reaction product of hexamethylene diisocyanate and trimethylolpropane, a biuret of hexamethylene diisocyanate and an isocyanurate of hexamethylene diisocyanate.
- a compound comprising a compound (B) obtained by reacting at least one hexamethylene diisocyanate modified with an imino group-containing alkoxysilane, a polymer (C) containing a specific structural unit, and a catalyst (D). Liquid moisture curable urethane resin composition "is described ([Claim 1]).
- Patent Documents 1 to 4 and the like are the types of adhesion-imparting agents (for example, isocyanate silane compounds of Patent Document 1) and adherends (coated plates). It was revealed that the adhesiveness may be inferior depending on the type of the material.
- an object of the present invention is to provide a one-component moisture-curable polyurethane composition having excellent adhesion to an adherend (coated plate).
- the present inventor has found that a compound having three or more isocyanate groups, a compound represented by formulas (1) to (4) described later, and formulas (1) to (3) By admixing a specific amount of a reaction product of at least one compound selected from the group consisting of hydrogenated compounds of the compound represented by the above as an adhesion-imparting agent, adhesion to the adherend (coating plate) can be improved.
- the present invention was completed by finding that it was favorable. That is, the present inventor has found that the above problem can be solved by the following configuration.
- an organotin compound (C) is contained, The one-component moisture-curable urethane composition according to [1], wherein the content of the organotin compound (C) is 0.001 to 0.5 parts by mass with respect to 100 parts by mass of the preliminary composition.
- a tertiary amine compound (D) is contained, The one-component moisture-curable urethane according to [1] or [2], wherein the content of the tertiary amine compound (D) is 0.01 to 4 parts by mass with respect to 100 parts by mass of the preliminary composition. Composition.
- the one-component moisture-curable polyurethane composition of the present invention includes a preliminary composition containing a urethane prepolymer (A) and a compound having three or more isocyanate groups ( b1) and at least one compound (b2) selected from the group consisting of compounds represented by formulas (1) to (4) described later and hydrogenated compounds of the compounds represented by formulas (1) to (3) ) Is reacted so that the ratio (NCO / OH) of the isocyanate group (NCO) of the compound (b1) to the hydroxyl group (OH) of the compound (b2) is 1.2 to 3.2.
- the “preliminary composition” means a composition containing components other than the adhesion-imparting agent (B) and any of the organic tin compounds (C) and tertiary amine compounds (D) described later. Specifically, it refers to a composition containing the urethane prepolymer (A) and optional additives (for example, a filler, a plasticizer, etc.).
- optional additives for example, a filler, a plasticizer, etc.
- urethane prepolymer (A) A conventionally well-known thing can be used for the urethane prepolymer (A) used for the preliminary
- a reaction product obtained by reacting a polyisocyanate compound with an active hydrogen compound having two or more active hydrogen groups in one molecule so that the isocyanate groups are excessive with respect to the active hydrogen groups. can be used.
- the urethane prepolymer (A) may contain 0.5 to 5% by mass of NCO groups at the molecular ends.
- the polyisocyanate compound used in the production of the urethane prepolymer (A) is not particularly limited as long as it has two or more isocyanate groups in the molecule.
- Specific examples of the polyisocyanate compound include TDI (for example, 2,4-tolylene diisocyanate (2,4-TDI), 2,6-tolylene diisocyanate (2,6-TDI)), MDI ( For example, 4,4'-diphenylmethane diisocyanate (4,4'-MDI), 2,4'-diphenylmethane diisocyanate (2,4'-MDI)), 1,4-phenylene diisocyanate, polymethylene polyphenylene polyisocyanate, xylylene diene Aromatic polyisocyanates such as isocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI), tolidine diisocyanate (TODI), 1,5-naphthal
- Such polyisocyanate compounds can be used alone or in combination of two or more.
- aromatic polyisocyanate is used because of the balance between the storage stability and the curing speed of the polyurethane composition of the present invention containing the urethane prepolymer (A) obtained, and the mechanical strength after curing is good. It is preferable to be TDI, MDI is more preferable, and MDI is still more preferable.
- the active hydrogen compound having two or more active hydrogen groups in one molecule used in the production of the urethane prepolymer (A) is not particularly limited.
- Preferred examples of the active hydrogen compound include a polyol compound having two or more hydroxyl (OH) groups in one molecule and a polyamine compound having two or more amino groups and / or imino groups in one molecule. Among them, a polyol compound is more preferable.
- the polyol compound is a compound having two or more OH groups
- its molecular weight and skeleton are not particularly limited, and specific examples thereof include low-molecular polyhydric alcohols, polyether polyols, polyester polyols, and the like. Examples thereof include polyols and mixed polyols thereof.
- low molecular weight polyhydric alcohols include ethylene glycol (EG), diethylene glycol, propylene glycol (PG), dipropylene glycol, (1,3- or 1,4-) butanediol, and pentanediol.
- Low molecular polyols such as neopentyl glycol, hexanediol, cyclohexanedimethanol, glycerin, 1,1,1-trimethylolpropane (TMP), 1,2,5-hexanetriol, pentaerythritol; saccharides such as sorbitol; etc. Is mentioned.
- polyether polyol and polyester polyol those derived from the above low-molecular polyhydric alcohols are usually used.
- aromatic diols, amines and alkanolamines are further used. Those derived from the above can also be suitably used.
- aromatic diol specifically, for example, resorcin (m-dihydroxybenzene), xylylene glycol, 1,4-benzenedimethanol, styrene glycol, 4,4′-dihydroxyethylphenol; Bisphenol A structure (4,4'-dihydroxyphenylpropane), bisphenol F structure (4,4'-dihydroxyphenylmethane), brominated bisphenol A structure, hydrogenated bisphenol A structure, bisphenol S structure, bisphenol AF Those having a bisphenol skeleton having a structure;
- amines include ethylene diamine and hexamethylene diamine
- alkanol amines include ethanol amine and propanol amine
- polyether polyol for example, at least one selected from the compounds exemplified as the above low molecular polyhydric alcohols, the above aromatic diols, the above amines, and the above alkanolamines, ethylene oxide, propylene oxide, butylene oxide
- polyether polyols include polyethylene glycol, polypropylene glycol (PPG), polypropylene triol, ethylene oxide / propylene oxide copolymer, polytetramethylene ether glycol (PTMEG), polytetraethylene glycol, sorbitol-based polyol. Etc.
- polyester polyol for example, a condensate (condensed polyester polyol) of any one of the low molecular polyhydric alcohols, the aromatic diols, the amines and the alkanolamines with a polybasic carboxylic acid. ); Lactone polyol; polycarbonate polyol; and the like.
- the polybasic carboxylic acid forming the condensed polyester polyol specifically, for example, glutaric acid, adipic acid, azelaic acid, fumaric acid, maleic acid, pimelic acid, suberic acid, sebacic acid, Hydroxycarboxylic acids such as phthalic acid, terephthalic acid, isophthalic acid, dimer acid, pyromellitic acid, other low-molecular carboxylic acids, oligomeric acids, castor oil, reaction products of castor oil and ethylene glycol (or propylene glycol), etc. Is mentioned.
- lactone polyol specifically, for example, a lactone such as ⁇ -caprolactone, ⁇ -methyl- ⁇ -caprolactone, ⁇ -methyl- ⁇ -caprolactone was subjected to ring-opening polymerization with an appropriate polymerization initiator. And those having hydroxyl groups at both ends.
- polystyrene resin examples include acrylic polyols; polybutadiene polyols; polymer polyols having carbon-carbon bonds in the main chain skeleton such as hydrogenated polybutadiene polyols;
- the various polyol compounds exemplified above may be used alone or in combination of two or more.
- polypropylene glycol has good viscosity of the urethane prepolymer (A) obtained, and the polyurethane composition of the present invention containing this has good mechanical strength, water resistance, cost and the like. It is preferable for the reason.
- a polyol having a weight average molecular weight of about 100 to 10,000 is preferred, and a polyol having a weight average molecular weight of 1,000 to 5,000 is more preferred. When the weight average molecular weight is within this range, the physical properties (for example, hardness, breaking strength, breaking elongation) and viscosity of the urethane prepolymer (A) to be obtained are good.
- polyamine compound examples include ethylenediamine, propylenediamine, butylenediamine, diethylenetriamine, triethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, hexamethylenediamine, trimethylhexamethylenediamine, 1 Aliphatic polyamines such as, 2-propanediamine, iminobispropylamine, methyliminobispropylamine, 1,5-diamino-2-methylpentane (MPMD, manufactured by DuPont Japan); metaphenylenediamine, orthophenylenediamine, Such as paraphenylenediamine, m-xylylenediamine (MXDA), diaminodiphenylmethane, diaminodiphenylsulfone, diaminodiethyldiphenylmethane.
- MXDA m-xylylenediamine
- N-aminoethylpiperazine a monoamine having an ether bond in the main chain such as 3-butoxyisopropylamine; a diamine having a polyether skeleton typified by Jeffamine EDR148 manufactured by Sun Techno Chemical Co .; isophorone diamine, 1, Cycloaliphatic polyamines such as 3-bisaminomethylcyclohexane (1,3BAC, manufactured by Mitsubishi Gas Chemical Company), 1-cyclohexylamino-3-aminopropane, 3-aminomethyl-3,3,5-trimethyl-cyclohexylamine; Norbornane diamine such as norbornane diamine (NBDA, Mitsui Chemicals); polyamide amine having an amino group at the molecular end of polyamide; 2,5-dimethyl-2,5-hexamethylenediamine, mensendiamine, 1,4 -Bis (2-Ami -2-Methylpropyl) piperazine, Jeffermine D230 and Jeffamine D400 manufactured by Sun Techno
- PPG polypropylene glycol
- a diamine having a polyether skeleton (Jefamine) and hexamethylenediamine are preferable.
- the preliminary composition of the polyurethane composition of the present invention is a filler, a plasticizer, an anti-sagging agent, an anti-aging agent, an antioxidant, a pigment (dye), a rocking agent as long as the purpose of the present invention is not impaired.
- Various additives such as a modification imparting agent, an ultraviolet absorber, a flame retardant, a surfactant (including a leveling agent), a dispersant, a dehydrating agent, an adhesion imparting agent, and an antistatic agent can be contained.
- the preliminary composition preferably contains a filler and a plasticizer.
- the filler examples include organic or inorganic fillers having various shapes. Specifically, for example, carbon black; calcium carbonate, heavy calcium carbonate, precipitated calcium carbonate (light calcium carbonate), colloidal calcium carbonate, magnesium carbonate, zinc carbonate; fumed silica, calcined silica, precipitated silica, ground silica , Fused silica; diatomaceous earth; iron oxide, zinc oxide, titanium oxide, barium oxide, magnesium oxide; waxite clay, kaolin clay, calcined clay; treated with these fatty acids, treated with resin acid, treated with urethane compound, fatty acid ester Treated products; and the like, and these may be used alone or in combination of two or more.
- the content when the filler is contained, is preferably 20 to 60% by mass, and more preferably 30 to 50% by mass with respect to the total mass of the preliminary composition.
- plasticizer examples include diisononyl phthalate (DINP); dioctyl adipate, isodecyl succinate; diethylene glycol dibenzoate, pentaerythritol ester; butyl oleate, methyl acetylricinoleate; tricresyl phosphate, trioctyl phosphate
- DINP diisononyl phthalate
- dioctyl adipate isodecyl succinate
- diethylene glycol dibenzoate pentaerythritol ester
- butyl oleate methyl acetylricinoleate
- tricresyl phosphate trioctyl phosphate
- Adipic acid propylene glycol polyester, adipic acid butylene glycol polyester, etc. may be mentioned, and these may be used alone or in combination of two or more.
- the content is preferably 4 to 40% by mass, and more preferably 25 to 35% by mass with respect to the total mass of the preliminary composition.
- Examples of the sag-preventing agent include acetylene black, ketjen black, colloidal silica, and the like.
- Specific examples of the anti-aging agent include hindered phenol compounds.
- Specific examples of the antioxidant include butylhydroxytoluene (BHT) and butylhydroxyanisole (BHA).
- the pigment include inorganic pigments such as titanium oxide, zinc oxide, ultramarine, bengara, lithopone, lead, cadmium, iron, cobalt, aluminum, hydrochloride, sulfate, etc .; azo pigment, phthalocyanine pigment, quinacridone Pigment, quinacridone quinone pigment, dioxazine pigment, anthrapyrimidine pigment, ansanthrone pigment, indanthrone pigment, flavanthrone pigment, perylene pigment, perinone pigment, diketopyrrolopyrrole pigment, quinonaphthalone pigment, anthraquinone pigment, thioindigo pigment, benzimidazolone And organic pigments such as pigments, isoindoline pigments, and carbon black.
- inorganic pigments such as titanium oxide, zinc oxide, ultramarine, bengara, lithopone, lead, cadmium, iron, cobalt, aluminum, hydrochloride, sulfate, etc
- thixotropic agent examples include aerosil (manufactured by Nippon Aerosil Co., Ltd.), disparon (manufactured by Enomoto Kasei Co., Ltd.), and the like.
- adhesion-imparting agent examples include terpene resins, phenol resins, terpene-phenol resins, rosin resins, xylene resins, and the like.
- the flame retardant include chloroalkyl phosphate, dimethyl / methylphosphonate, bromine / phosphorus compound, ammonium polyphosphate, neopentyl bromide-polyether, brominated polyether, and the like.
- Specific examples of the antistatic agent include quaternary ammonium salts; hydrophilic compounds such as polyglycols and ethylene oxide derivatives.
- the adhesion-imparting agent (B) used in the polyurethane composition of the present invention and not contained in the preliminary composition is represented by a compound (b1) having three or more isocyanate groups and formulas (1) to (4) described later. And at least one compound (b2) selected from the group consisting of hydrogenated compounds of the compounds represented by formulas (1) to (3) and an isocyanate group (NCO) of compound (b1) This is a reaction product obtained by reacting the compound (b2) with the hydroxyl group (OH) so that the ratio (NCO / OH) is 1.2 to 3.2.
- Patent Document 1 describes “a reaction product of a compound having at least three isocyanate groups obtained by reacting trimethylolpropane and a diisocyanate compound and a secondary aminosilane having a specific structure”.
- Patent Documents 2 and 3 “A compound obtained by reacting trimethylolpropane with a bifunctional isocyanate so that the equivalent ratio of NCO group to OH group is 0.8 to 1.5 is mixed with aryl.
- a compound obtained by reacting a compound having an imino group directly bonded to a nitrogen atom and having a hydrolyzable silyl group such that the equivalent ratio of NCO group to NH group is 1.8 to 3.5 (A) ” is described, but the hydrogenated compounds of the compounds represented by formulas (1) to (4) and the compounds represented by formulas (1) to (3) described later It has not been described.
- adhesiveness with the to-be-adhered body (coating board) of the polyurethane composition of this invention becomes favorable by containing a predetermined amount of such an adhesion imparting agent (B).
- adhesion imparting agent (B) such an adhesion imparting agent (B).
- the inventor presumes as follows. That is, the compound represented by the formulas (1) to (4) and the formulas (1) to (3), which will be described later, with respect to the compound (b1) having three or more isocyanate groups known as adhesion promoters. This is considered to be because wettability to the adherend (coated plate) was improved by reacting at least one compound (b2) selected from the group consisting of hydrogenated compounds.
- aminosilane eg, ⁇ -N-phenylaminopropyltrimethoxysilane
- a compound similar to terpineol represented by formulas (1) to (3) described later eg, carbenol, peryl alcohol.
- Berbenol, etc. is an effect that cannot be obtained.
- the compound (b1) used in the preparation of the adhesion-imparting agent (B) is not particularly limited as long as it is a compound having three or more isocyanate groups, and specific examples thereof include a diisocyanate compound and trimethylolpropane (hereinafter referred to as “a”). Or a reaction product obtained by reacting glycerin with NCO / OH to be 1.8 to 2.2, a biuret form of a diisocyanate compound, an isocyanurate form of a diisocyanate compound, and the like. These may be used alone or in combination of two or more.
- generation of a compound (b1) it has two isocyanate groups in a molecule
- these diisocyanate compounds aliphatic polyisocyanates are used because the adhesion with the adherend (coated plate) of the polyurethane composition of the present invention containing the resulting adhesion-imparting agent (B) is better. Is preferable, and HDI is more preferable.
- reaction product of diisocyanate compound and TMP is a reaction product obtained by reacting a diisocyanate compound and TMP at an equivalent ratio of NCO / OH of 1.8 to 2.2, and is the same as the preparation of a normal urethane prepolymer. For example, it can be carried out by heating and stirring the above-mentioned equivalent ratio of HDI and TMP at 50 to 100 ° C. If necessary, a urethanization catalyst such as an organic tin compound, organic bismuth, or amine can be used. As said reaction material, the compound represented by following formula (5) is mentioned suitably, for example.
- reaction product of diisocyanate compound and glycerin is a reaction product obtained by reacting a diisocyanate compound and glycerin at an equivalent ratio of NCO / OH of 1.8 to 2.2, and is the same as the preparation of a normal urethane prepolymer. For example, it can be carried out by heating and stirring the above-mentioned equivalent ratio of HDI and glycerin at 50 to 100 ° C. If necessary, a urethanization catalyst such as an organic tin compound, organic bismuth, or amine can be used. As said reaction material, the compound represented by following formula (6) is mentioned suitably, for example.
- biuret body of diisocyanate compound As a biuret body of a diisocyanate compound, for example, a compound represented by the following formula (7) is preferably exemplified.
- isocyanurate of diisocyanate compound As an isocyanurate body of a diisocyanate compound, for example, a compound represented by the following formula (8) is preferably exemplified.
- the compound (b2) used in the preparation of the adhesion-imparting agent (B) includes compounds represented by the following formulas (1) to (4) and compounds represented by the following formulas (1) to (3). It is at least one compound selected from the group consisting of hydrogenated compounds.
- the compound represented by the above formula (1) ( ⁇ -terpineol), the compound represented by the above formula (2) ( ⁇ -terpineol), the compound represented by the above formula (3) ( ⁇ -terpineol) ) are preferably used, and these may be used alone or in combination of two or more.
- the ratio of the isocyanate group of the compound (b1) to the hydroxyl group of the compound (b2) (NCO / OH) is 1.2 to 3. 2 is a reaction product reacted to be 2.
- the reaction conditions can be carried out in the same manner as in the preparation of a normal urethane prepolymer.
- the compound (b1) and the compound (b2) having the above-mentioned equivalent ratio are heated and stirred at 50 to 100 ° C. Can be done.
- a urethanization catalyst such as an organic tin compound, organic bismuth, or amine can be used.
- the content of the adhesion-imparting agent (B) is 0.1 to 10 parts by weight, preferably 0.5 to 8 parts by weight, based on 100 parts by weight of the preliminary composition. It is more preferably 1 to 5 parts by mass.
- the polyurethane composition of the present invention has better adhesion to an adherend (coating plate) and is not included in the preliminary composition because it can adhere to the adherend without using a primer, particularly at low temperatures. It is preferable to contain an organotin compound (C) as a component.
- organotin compound (C) examples include conventionally known organotin catalysts, and specific examples thereof include dioctyltin dilaurate, dibutyltin dilaurate, dibutyltin maleate, stannous octate, dibutyltin diacetylacetonate, dioctyl.
- a tin maleate etc. are mentioned, These may be used individually by 1 type and may use 2 or more types together.
- a molar ratio of 1,3-diacetoxy-1,1,3,3-tetrabutyl-distanoxane and ethyl silicate is 1: 0.8 to 1: 1.2.
- distanoxane reactant (Hereinafter, simply referred to as “distanoxane reactant” in this paragraph).
- dibutyltin diacetylacetonate and distanoxane reactants are preferred because the adhesion to the adherend (coating plate) becomes better at low temperatures and the water-resistant adhesion is also good, and the distanoxane reactant is preferred. It is more preferable that
- the content is preferably 0.001 to 0.5 parts by mass with respect to 100 parts by mass of the preliminary composition, and 0.01 to The amount is more preferably 0.10 parts by mass.
- the polyurethane composition of the present invention preferably contains a tertiary amine compound (D) as an optional component not included in the preliminary composition from the viewpoint of adjusting to an appropriate curing rate.
- tertiary amine compound (D) examples include conventionally known tertiary amine catalysts, and specific examples thereof include trimethylamine, triethylamine, tripropylamine, tributylamine, triamylamine, trihexyl.
- N, N-dimethylaminoethyl morpholine and dimorpholino diethyl ether are preferable because the film-forming property at the time of application is good and the balance between storage stability and curing speed is good. It is preferable to use these in combination.
- the content when the tertiary amine compound (D) is contained is preferably 0.01 to 4 parts by mass, preferably 0.1 to 4 parts by mass with respect to 100 parts by mass of the preliminary composition. It is more preferable that it is 0.8 mass part.
- N, N-dimethylaminoethylmorpholine is used as the tertiary amine compound (D)
- the content thereof is 0.01 to 2.0 mass with respect to 100 mass parts of the preliminary composition. Part is preferable, and 0.01 to 0.2 part by mass is more preferable.
- the content thereof is 0.01 to 2.0 parts by mass with respect to 100 parts by mass of the preliminary composition. It is preferably 0.05 to 0.8 parts by mass.
- the production method of the polyurethane composition of the present invention is not particularly limited.
- the adhesion-imparting agent (B) any organic tin compound (C) and tertiary amine compound (D) are mixed and used at room temperature or under heating (40-60 ° C., for example 40 ° C.) using a roll, kneader, extruder, universal stirrer, etc. Can be sufficiently mixed and uniformly dispersed (kneaded).
- ⁇ Urethane prepolymer (A-1)> 500 g of polyoxypropylene diol (average molecular weight 2000), 1150 g of polyoxypropylene triol (average molecular weight 5000), and 264 g of 4,4′-diisocyanatophenylmethane (molecular weight 250) are mixed (NCO / OH 1.8 at this time) Further, 800 g of diisononyl phthalate was added, and the mixture was stirred for 24 hours at 80 ° C. in a nitrogen stream, and reacted to synthesize a urethane prepolymer (A-1) containing 1.45% of isocyanate groups.
- a pre-composition was prepared by mixing 40 parts by mass of diisononyl phthalate (DINP, manufactured by J-Plus) using a stirrer.
- DINP diisononyl phthalate
- ⁇ Preparation of adhesion promoter B-4> The HDI biuret body which is the compound (b1-3) and the compound represented by the above formula (4) (manufactured by Nippon Terpene Chemical Co., Ltd.) are mixed so that the equivalent ratio (NCO / OH) is 3.0.
- the adhesion-imparting agent B-4 was prepared by heating and stirring at 80 ° C. for 30 minutes.
- Each urethane composition prepared was applied to an adherend for curing test evaluation (glass coated with a primer (MS-90, manufactured by Yokohama Rubber Co., Ltd.)) and allowed to stand at 20 ° C. and 60% relative humidity for 3 hours. After that, it was immersed in warm water at 40 ° C. for 24 hours. Thereafter, one end of the cured product of the urethane composition was gripped and peeled 180 degrees, and the destruction state was observed.
- a primer MS-90, manufactured by Yokohama Rubber Co., Ltd.
- Cohesive failure of the cured product is CF (the numerical value is the area (%) where the cohesive failure of the cured product occurs relative to the area of the part where the cured product is peeled off), PS is the interface peeling between the primer and the cured product (the numerical value is the cured product) Is the area (%) at which interfacial peeling between the primer and the cured product occurred relative to the area of the peeled portion.
- Each urethane composition prepared was applied to an adherend for curing test evaluation (glass coated with primer (MS-90, manufactured by Yokohama Rubber Co., Ltd.)) and cured under conditions of 20 ° C. and 60% relative humidity.
- the skinning time was measured. A case where the skinning time is 20 minutes or more and less than 70 minutes is evaluated as “ ⁇ ” as having good curability, and a case where the skinning time is 70 minutes or more and less than 100 minutes has a practical problem in curability. “ ⁇ ” was evaluated as not present, and “ ⁇ ” was evaluated as inferior in curability when the skinning time was less than 20 minutes or 100 minutes or more.
- Each urethane composition prepared on a glass plate was extruded in a strip shape with a right triangle bead with a base of 6 mm and a height of 10 mm, immediately attached with a holder, held at a 90 ° angle, and under conditions of 20 ° C. and 65% relative humidity. Left for 30 minutes. The hung distance h (mm) of the apex of each urethane composition after standing for 30 minutes was measured.
- Each urethane composition prepared is applied to an adherend for curing test evaluation (glass coated with primer (MS-90, manufactured by Yokohama Rubber Co., Ltd.)) and left for 7 days under conditions of 20 ° C. and 60% relative humidity. After that, it was left at 120 ° C. for 5 days and gradually cooled to 20 ° C. Thereafter, one end of the cured product of the urethane composition was gripped and peeled 180 degrees, and the destruction state was observed.
- an adherend for curing test evaluation glass coated with primer (MS-90, manufactured by Yokohama Rubber Co., Ltd.)
- Cohesive failure of the cured product is CF (the numerical value is the area (%) where the cohesive failure of the cured product occurs relative to the area of the part where the cured product is peeled off), PS is the interface peeling between the primer and the cured product (the numerical value is the cured product) Is the area (%) at which interfacial peeling between the primer and the cured product occurred relative to the area of the peeled portion.
- urethane composition was directly applied to the coated plates 1 to 3 on which the following paints 1 to 3 were respectively applied to the steel plates without using a primer, and allowed to stand at 20 ° C. and 60% relative humidity for 7 days. Thereafter, one end of the cured product of the urethane composition was gripped and peeled 180 degrees, and the destruction state was observed.
- Cohesive failure of the cured product is CF (the numerical value is the area (%) where the cohesive failure of the cured product occurs relative to the area of the part where the cured product is peeled off), PS is the interface peeling between the primer and the cured product (the numerical value is the cured product) Is the area (%) at which interfacial peeling between the primer and the cured product occurred relative to the area of the peeled portion.
- CF the numerical value is the area (%) where the cohesive failure of the cured product occurs relative to the area of the part where the cured product is peeled off
- PS is the interface peeling between the primer and the cured product (the numerical value is the cured product) Is the area (%) at which interfacial peeling between the primer and the cured product occurred relative to the area of the peeled portion.
- -Paint 1 acid / epoxy paint
- Paint 2 acrylic / melamine
- Paint-Paint 3 acrylic / silicone paint
- Comparative Examples 1, 2, and 8 in which a conventionally known HDI-TMP adduct, HDI isocyanurate, and aminosilane are blended as an adhesion imparting agent, but also an adhesion imparting agent X- having a structure similar to that of the adhesion imparting agent (B). It was also found that Comparative Examples 5 to 7 containing 3 to X-5 were inferior in adhesion.
- Examples 1 to 22 in which a specific amount of the adhesion-imparting agent (B) was blended had good adhesion to the coated plate.
- the content of the adhesion-imparting agent (B) is 0.1 to 5.0 parts by mass with respect to 100 parts by mass of the preliminary composition, the elongation at break was found to be good.
- the content of the organotin compound (C) is 0.001 to 0.5 parts by mass with respect to 100 parts by mass of the preliminary composition. It was found that the heat resistant adhesiveness was good.
- Example 2 the content of N, N-dimethylaminoethylmorpholine used as the tertiary amine compound (D) is 0.
- the content of dimorpholinodiethyl ether is 0.01 to 2.0 parts by mass with respect to 100 parts by mass of the preliminary composition, high-temperature and high-humidity adhesiveness and curability are good. I found out that
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Abstract
Description
このようなウレタン樹脂組成物として、ポリオール系化合物とイソシアネート系化合物とからなる2液型と、空気中の湿気等によって硬化する1液型の組成物とが知られているが、近年、現地施工における組成物の混合調整が不要で取扱いが容易である等の点で、1液湿気硬化型ポリウレタン組成物の利用が拡大している。
更に、特許文献3には、有機スズ化合物とともに、「ジモルフォリノジエチルエーテル」および「N,N-ジメチルアミノエチルモルフォリン」を併用する一液湿気硬化型ウレタン組成物が記載されている([請求項1])。
すなわち、本発明者は、以下の構成により上記課題が解決できることを見出した。
イソシアネート基を3個以上有する化合物(b1)と、下記式(1)~(4)で表される化合物および下記式(1)~(3)で表される化合物の水添化合物からなる群から選択される少なくとも1種の化合物(b2)とを、上記化合物(b1)のイソシアネート基(NCO)と上記化合物(b2)の水酸基(OH)との比(NCO/OH)が1.2~3.2となるように反応させた反応物である接着付与剤(B)と、を含有し、
上記接着付与剤(B)の含有量が、上記予備組成物100質量部に対して0.1~10質量部である、1液湿気硬化型ウレタン組成物。
上記有機スズ化合物(C)の含有量が、上記予備組成物100質量部に対して0.001~0.5質量部である、[1]に記載の1液湿気硬化型ウレタン組成物。
[3] 更に、第3級アミン化合物(D)を含有し、
上記第3級アミン化合物(D)の含有量が、上記予備組成物100質量部に対して0.01~4質量部である、[1]または[2]に記載の1液湿気硬化型ウレタン組成物。
[4] 上記化合物(b1)が、ジイソシアネート化合物とトリメチロールプロパンまたはグリセリンとをNCO/OHが1.8~2.2となるように反応させた反応物、ジイソシアネート化合物のビウレット体、および、ジイソシアネート化合物のイソシアヌレート体からなる群から選択される少なくとも1種である、[1]~[3]のいずれかに記載の1液湿気硬化型ウレタン組成物。
ここで、本明細書において、「予備組成物」とは、接着付与剤(B)ならびに後述する任意の有機スズ化合物(C)および第3級アミン化合物(D)以外の成分を含む組成物といい、具体的には、ウレタンプレポリマー(A)および任意の添加剤(例えば、充填剤、可塑剤など)を含有する組成物をいう。
次に、ウレタンプレポリマー(A)、接着付与剤(B)、有機スズ化合物(C)および第3級アミン化合物(D)ならびに添加剤について詳述する。
本発明のポリウレタン組成物の予備組成物に用いられるウレタンプレポリマー(A)は、通常の1液型のポリウレタン組成物と同様、従来公知のものを用いることができる。例えば、ポリイソシアネート化合物と1分子中に2個以上の活性水素基を有する活性水素化合物とを、活性水素基に対してイソシアネート基が過剰となるように反応させることにより得られる反応生成物等を用いることができる。
また、上記ウレタンプレポリマー(A)は、0.5~5質量%のNCO基を分子末端に含有することができる。
ウレタンプレポリマー(A)の製造の際に使用されるポリイソシアネート化合物は、分子内にイソシアネート基を2個以上有するものであれば特に限定されない。
ポリイソシアネート化合物としては、具体的には、例えば、TDI(例えば、2,4-トリレンジイソシアネート(2,4-TDI)、2,6-トリレンジイソシアネート(2,6-TDI))、MDI(例えば、4,4′-ジフェニルメタンジイソシアネート(4,4′-MDI)、2,4′-ジフェニルメタンジイソシアネート(2,4′-MDI))、1,4-フェニレンジイソシアネート、ポリメチレンポリフェニレンポリイソシアネート、キシリレンジイソシアネート(XDI)、テトラメチルキシリレンジイソシアネート(TMXDI)、トリジンジイソシアネート(TODI)、1,5-ナフタレンジイソシアネート(NDI)、トリフェニルメタントリイソシアネートのような芳香族ポリイソシアネート;ヘキサメチレンジイソシアネート(HDI)、トリメチルヘキサメチレンジイソシアネート(TMHDI)、リジンジイソシアネート、ノルボルナンジイソシアネート(NBDI)のような脂肪族ポリイソシアネート;トランスシクロヘキサン-1,4-ジイソシアネート、イソホロンジイソシアネート(IPDI)、ビス(イソシアネートメチル)シクロヘキサン(H6XDI)、ジシクロヘキシルメタンジイソシアネート(H12MDI)のような脂環式ポリイソシアネート;これらのカルボジイミド変性ポリイソシアネート;これらのイソシアヌレート変性ポリイソシアネート;等が挙げられる。
これらのうち、得られるウレタンプレポリマー(A)を含有する本発明のポリウレタン組成物の貯蔵安定性と硬化速度のバランスや、硬化後の機械的強度が良好となる理由から、芳香族ポリイソシアネートであるのが好ましく、TDI、MDIであるのがより好ましく、MDIであるのが更に好ましい。
ウレタンプレポリマー(A)の製造の際に使用される1分子中に2個以上の活性水素基を有する活性水素化合物は特に限定されない。
ここで、芳香族ジオール類としては、具体的には、例えば、レゾルシン(m-ジヒドロキシベンゼン)、キシリレングリコール、1,4-ベンゼンジメタノール、スチレングリコール、4,4′-ジヒドロキシエチルフェノール;下記に示すようなビスフェノールA構造(4,4′-ジヒドロキシフェニルプロパン)、ビスフェノールF構造(4,4′-ジヒドロキシフェニルメタン)、臭素化ビスフェノールA構造、水添ビスフェノールA構造、ビスフェノールS構造、ビスフェノールAF構造のビスフェノール骨格を有するもの;等が挙げられる。
このようなポリエーテルポリオールの具体例としては、ポリエチレングリコール、ポリプロピレングリコール(PPG)、ポリプロピレントリオール、エチレンオキサイド/プロピレンオキサイド共重合体、ポリテトラメチレンエーテルグリコール(PTMEG)、ポリテトラエチレングリコール、ソルビトール系ポリオール等が挙げられる。
ここで、上記縮合系ポリエステルポリオールを形成する多塩基性カルボン酸としては、具体的には、例えば、グルタル酸、アジピン酸、アゼライン酸、フマル酸、マレイン酸、ピメリン酸、スベリン酸、セバシン酸、フタル酸、テレフタル酸、イソフタル酸、ダイマー酸、ピロメリット酸、他の低分子カルボン酸、オリゴマー酸、ヒマシ油、ヒマシ油とエチレングリコール(もしくはプロピレングリコール)との反応生成物などのヒドロキシカルボン酸等が挙げられる。
また、上記ラクトン系ポリオールとしては、具体的には、例えば、ε-カプロラクトン、α-メチル-ε-カプロラクトン、ε-メチル-ε-カプロラクトン等のラクトンを適当な重合開始剤で開環重合させたもので両末端に水酸基を有するものが挙げられる。
これらのうち、ポリプロピレングリコールであるのが、得られるウレタンプレポリマー(A)の粘度が良好となり、また、これを含有する本発明のポリウレタン組成物の機械的強度や耐水性、コストなどが良好となる理由から好ましい。
また、重量平均分子量が100~10000程度であるポリオールが好ましく、1000~5000であるポリオールがより好ましい。重量平均分子量がこの範囲であると、得られるウレタンプレポリマー(A)の物性(例えば、硬度、破断強度、破断伸び)および粘度が良好となる。
これらのうち、ポリエーテル骨格のジアミン(ジェファーミン)、ヘキサメチレンジアミンであるのが好ましい。
本発明のポリウレタン組成物の予備組成物は、必要に応じて本発明の目的を損なわない範囲で、充填剤、可塑剤、垂れ止め剤、老化防止剤、酸化防止剤、顔料(染料)、揺変性付与剤、紫外線吸収剤、難燃剤、界面活性剤(レベリング剤を含む)、分散剤、脱水剤、接着付与剤、帯電防止剤などの各種添加剤等を含有することができる。
これらのうち、予備組成物には、充填剤および可塑剤を含有しているのが好ましい。
充填剤としては、各種形状の有機または無機の充填剤が挙げられる。具体的には、例えば、カーボンブラック;炭酸カルシウム、重質炭酸カルシウム、沈降性炭酸カルシウム(軽質炭酸カルシウム)、コロイダル炭酸カルシウム、炭酸マグネシウム、炭酸亜鉛;ヒュームドシリカ、焼成シリカ、沈降シリカ、粉砕シリカ、溶融シリカ;ケイソウ土;酸化鉄、酸化亜鉛、酸化チタン、酸化バリウム、酸化マグネシウム;ろう石クレー、カオリンクレー、焼成クレー;これらの脂肪酸処理物、樹脂酸処理物、ウレタン化合物処理物、脂肪酸エステル処理物;等が挙げられ、これらを1種単独で用いても2種以上を併用してもよい。
老化防止剤としては、具体的には、例えば、ヒンダードフェノール系等の化合物が挙げられる。
酸化防止剤としては、具体的には、例えば、ブチルヒドロキシトルエン(BHT)、ブチルヒドロキシアニソール(BHA)等が挙げられる。
接着付与剤としては、具体的には、例えば、テルペン樹脂、フェノール樹脂、テルペン-フェノール樹脂、ロジン樹脂、キシレン樹脂等が挙げられる。
帯電防止剤としては、具体的には、例えば、第四級アンモニウム塩;ポリグリコール、エチレンオキサイド誘導体等の親水性化合物等が挙げられる。
本発明のポリウレタン組成物に用いられ、予備組成物に含まれない接着付与剤(B)は、イソシアネート基を3個以上有する化合物(b1)と、後述する式(1)~(4)で表される化合物および式(1)~(3)で表される化合物の水添化合物からなる群から選択される少なくとも1種の化合物(b2)とを、化合物(b1)のイソシアネート基(NCO)と化合物(b2)の水酸基(OH)との比(NCO/OH)が1.2~3.2となるように反応させた反応物である。
ここで、上述したように、特許文献1では、「トリメチロールプロパンおよびジイソシアネート化合物を反応させて得られるイソシアネート基を少なくとも3個有する化合物と特定の構造を有する2級アミノシランとの反応物」が記載されており、また、特許文献2および3では、「トリメチロールプロパンに2官能イソシアネートをNCO基とOH基の当量比が0.8~1.5になるように反応させてなる化合物に、アリール基が窒素原子に直接結合したイミノ基を有し、かつ加水分解性シリル基を有する化合物を、NCO基とNH基の当量比が1.8~3.5になるように反応させてなる化合物(A)」などが記載されているが、後述する式(1)~(4)で表される化合物および式(1)~(3)で表される化合物の水添化合物については記載されていない。
これは、詳細には明らかではないが、本発明者は以下のように推測している。
すなわち、接着付与剤として公知のイソシアネート基を3個以上有する化合物(b1)に対して、後述する式(1)~(4)で表される化合物および式(1)~(3)で表される化合物の水添化合物からなる群から選択される少なくとも1種の化合物(b2)を反応させることにより、被着体(塗板)に対する濡れ性が向上したためであると考えられる。
また、この効果は、アミノシラン(例えば、γ-N-フェニルアミノプロピルトリメトキシシラン)や、後述する式(1)~(3)で表されるターピネオールに類似する化合物(例えば、カルベノール、ぺリルアルコール、ベルベノールなど)を用いた場合には得られない効果であるため、極めて意外な効果であると言える。
接着付与剤(B)の調製の際に使用される化合物(b1)は、イソシアネート基を3個以上有する化合物であれば特に限定されないが、その具体例としては、ジイソシアネート化合物とトリメチロールプロパン(以下、「TMP」とも略す。)またはグリセリンとをNCO/OHが1.8~2.2となるように反応させた反応物、ジイソシアネート化合物のビウレット体、ジイソシアネート化合物のイソシアヌレート体等が挙げられ、これらを1種単独で用いてもよく、2種以上を併用してもよい。
ここで、化合物(b1)の生成に用いられるジイソシアネート化合物としては、例えば、上述したウレタンプレポリマー(A)の製造の際に使用されるポリイソシアネート化合物のうち、分子内にイソシアネート基を2個有するものが挙げられる。
これらのジイソシアネート化合物のうち、得られる接着付与剤(B)を含有する本発明のポリウレタン組成物の被着体(塗板)との接着性がより良好となる理由から、脂肪族ポリイソシアネートであるのが好ましく、HDIであるのがより好ましい。
ジイソシアネート化合物とTMPとの反応物は、ジイソシアネート化合物とTMPとを、NCO/OHが1.8~2.2となる当量比で反応させた反応物であり、通常のウレタンプレポリマーの調製と同様の方法で行うことができ、例えば、上述の当量比のHDIとTMPとを50~100℃で加熱撹拌することによって行うことができる。
なお、必要に応じて、有機錫化合物、有機ビスマス、アミン等のウレタン化触媒を用いることもできる。
上記反応物としては、例えば、下記式(5)で表される化合物が好適に挙げられる。
ジイソシアネート化合物とグリセリンとの反応物は、ジイソシアネート化合物とグリセリンとを、NCO/OHが1.8~2.2となる当量比で反応させた反応物であり、通常のウレタンプレポリマーの調製と同様の方法で行うことができ、例えば、上述の当量比のHDIとグリセリンとを50~100℃で加熱撹拌することによって行うことができる。
なお、必要に応じて、有機錫化合物、有機ビスマス、アミン等のウレタン化触媒を用いることもできる。
上記反応物としては、例えば、下記式(6)で表される化合物が好適に挙げられる。
接着付与剤(B)の調製の際に使用される化合物(b2)は、下記式(1)~(4)で表される化合物および下記式(1)~(3)で表される化合物の水添化合物からなる群から選択される少なくとも1種の化合物である。
接着付与剤(B)は、上述した化合物(b1)と化合物(b2)を、化合物(b1)のイソシアネート基と化合物(b2)の水酸基との比(NCO/OH)が1.2~3.2となるように反応させた反応物である。
ここで、上記反応条件は、通常のウレタンプレポリマーの調製と同様の方法で行うことができ、例えば、上述の当量比の化合物(b1)と化合物(b2)とを50~100℃で加熱撹拌することによって行うことができる。
なお、必要に応じて、有機錫化合物、有機ビスマス、アミン等のウレタン化触媒を用いることもできる。
本発明のポリウレタン組成物は、被着体(塗板)との接着性がより良好となり、特に低温下においてプライマーを使用せずに被着体と接着できる理由から、予備組成物に含まれない任意成分として、有機スズ化合物(C)を含有しているのが好ましい。
上記有機スズ化合物の他の具体例としては、1,3-ジアセトキシ-1,1,3,3-テトラブチル-ジスタノキサンとエチルシリケートとをモル比が1:0.8~1:1.2となるように反応させた反応物(以下、本段落において単に「ジスタノキサン反応物」と略す。)が挙げられる。
これらのうち、低温下において被着体(塗板)との接着性がより良好となり、また耐水接着性も良好となる理由から、ジブチルスズジアセチルアセトネート、ジスタノキサン反応物であるのが好ましく、ジスタノキサン反応物であるのがより好ましい。
本発明のポリウレタン組成物は、適切な硬化速度に調整する観点から、予備組成物に含まれない任意成分として、第3級アミン化合物(D)を含有しているのが好ましい。
これらのうち、塗布時の塗膜形成性が良好となり、また、貯蔵安定性と硬化速度とのバランスが良好となる理由から、N,N-ジメチルアミノエチルモルフォリン、ジモルフォリノジエチルエーテルであるのが好ましく、これらを併用するのがより好ましい。
特に、上記第3級アミン化合物(D)として、N,N-ジメチルアミノエチルモルフォリンを用いる場合は、その含有量は、上記予備組成物100質量部に対して0.01~2.0質量部であるのが好ましく、0.01~0.2質量部であるのがより好ましい。
また、上記第3級アミン化合物(D)として、ジモルフォリノジエチルエーテルを用いる場合は、その含有量は、上記予備組成物100質量部に対して0.01~2.0質量部であるのが好ましく、0.05~0.8質量部であるのがより好ましい。
<ウレタンプレポリマー(A-1)>
ポリオキシプロピレンジオール(平均分子量2000)500g、ポリオキシプロピレントリオール(平均分子量5000)1150g、および4,4′-ジイソシアネートフェニルメタン(分子量250)264gを混合し(この時NCO/OH=1.8)、更にフタル酸ジイソノニル800gを加えて、窒素気流中、80℃で24時間撹拌を行い、反応させて、イソシアネート基を1.45%含有するウレタンプレポリマー(A-1)を合成した。
<化合物(b1-1)の合成>
接着付与剤の調製に用いる化合物(b1-1)として、上記式(5)で表されるHDI-TMP付加体(合成品)を用いた。なお、合成は、HDIを予め添加したフラスコ内に、NCO/OHが2.0となる当量比でTMPを撹拌しながら滴下し、その後、80℃で24時間反応させることにより行った。
<化合物(b1-2)>
接着付与剤の調製に用いる化合物(b1-2)として、上記式(8)で表されるHDIイソシアヌレート体(D170N、三井化学社製)を用いた。
<化合物(b1-3)>
接着付与剤の調製に用いる化合物(b1-3)として、上記式(7)で表されるHDIビウレット体(D165N、三井化学社製)を用いた。
上記化合物(b1-2)であるHDIイソシアヌレート体と上記式(1)~(3)で表されるターピネオールの混合物(日本テルペン化学社製)とを、当量比(NCO/OH)が3.0となるように混合し、80℃で30分間加熱撹拌することにより、接着付与剤B-1を調製した。
上記化合物(b1-3)であるHDIビウレット体と上記式(1)~(3)で表されるターピネオールの混合物(日本テルペン化学社製)とを、当量比(NCO/OH)が3.0となるように混合し、80℃で30分間加熱撹拌することにより、接着付与剤B-2を調製した。
上記化合物(b1-1)であるHDI-TMP付加体と上記式(1)~(3)で表されるターピネオールの混合物(日本テルペン化学社製)とを、当量比(NCO/OH)が3.0となるように混合し、80℃で30分間加熱撹拌することにより、接着付与剤B-3を調製した。
上記化合物(b1-3)であるHDIビウレット体と上記式(4)で表される化合物(日本テルペン化学社製)とを、当量比(NCO/OH)が3.0となるように混合し、80℃で30分間加熱撹拌することにより、接着付与剤B-4を調製した。
上記化合物(b1-3)であるHDIビウレット体と上記式(1)~(3)で表されるターピネオールの水添化合物の混合物(日本テルペン化学社製)とを、当量比(NCO/OH)が3.0となるように混合し、80℃で30分間加熱撹拌することにより、接着付与剤B-5を調製した。
上記化合物(b1-2)であるHDIイソシアヌレート体と上記式(1)~(3)で表されるターピネオールの混合物(日本テルペン化学社製)とを、当量比(NCO/OH)が1.1となるように混合し、80℃で30分間加熱撹拌することにより、接着付与剤X-1を調製した。
上記化合物(b1-2)であるHDIイソシアヌレート体と上記式(1)~(3)で表されるターピネオールの混合物(日本テルペン化学社製)とを、当量比(NCO/OH)が3.3となるように混合し、80℃で30分間加熱撹拌することにより、接着付与剤X-2を調製した。
上記化合物(b1-3)であるHDIビウレット体と下記式(9)で表されるカルベノール(日本テルペン化学社製)とを、当量比(NCO/OH)が3.0となるように混合し、80℃で30分間加熱撹拌することにより、接着付与剤X-3を調製した。
上記化合物(b1-3)であるHDIビウレット体と下記式(10)で表されるぺリルアルコール(日本テルペン化学社製)とを、当量比(NCO/OH)が3.0となるように混合し、80℃で30分間加熱撹拌することにより、接着付与剤X-4を調製した。
上記化合物(b1-3)であるHDIビウレット体と下記式(11)で表されるベルベノール(日本テルペン化学社製)とを、当量比(NCO/OH)が3.0となるように混合し、80℃で30分間加熱撹拌することにより、接着付与剤X-5を調製した。
下記第1表に示す各成分を、第1表に示す組成(質量部)で、かくはん機を用いて混合し、第1表に示される各ポリウレタン組成物を得た。
硬化試験評価用被着体(プライマー(MS-90、横浜ゴム社製)を塗布したガラス)に、調製した各ウレタン組成物を塗布し、20℃、60%相対湿度の条件下で3時間放置した後、40℃の温水に24時間浸漬させた。
その後、ウレタン組成物の硬化物の一端を把持して180度剥離し、破壊状態を観察した。硬化物の凝集破壊をCF(数値は、硬化物を剥離した部分の面積に対する硬化物の凝集破壊が起きた面積(%))、プライマー/硬化物間の界面剥離をPS(数値は、硬化物を剥離した部分の面積に対するプライマー/硬化物間の界面剥離が起きた面積(%))とした。
硬化試験評価用被着体(プライマー(MS-90、横浜ゴム社製)を塗布したガラス)に、調製した各ウレタン組成物を塗布し、20℃、60%相対湿度の条件下で硬化させた際の皮張り時間を測定した。
皮張り時間が20分以上70分未満であるものを硬化性が良好であるものとして「○」と評価し、皮張り時間が70分以上100分未満であるものを硬化性に実用上問題がないものとして「△」と評価し、皮張り時間が20分未満または100分以上であるものを硬化性に劣るものとして「×」と評価した。
ガラス板に調製した各ウレタン組成物を底辺6mm、高さ10mmの直角三角形ビードで帯状に押し出し、直ちに保持具を取り付け、90°の角度に保持し、20℃、65%相対湿度の条件下で30分放置した。
30分放置後の各ウレタン組成物の頂点の垂れ下がりの距離h(mm)を測定した。
調製した各ポリウレタン組成物を容器に密封し、40℃で7日間貯蔵した後のSOD粘度(Pa・s)を測定し、貯蔵前のSOD粘度からの粘度上昇率を算出した。結果を下記第1表に示す。
ここで、SOD粘度は、JASO M338-89に準拠して、圧力粘度計(ASTM D 1092)を用いて測定した。
硬化試験評価用被着体(プライマー(MS-90、横浜ゴム社製)を塗布したガラス)に、調製した各ウレタン組成物を塗布し、20℃、60%相対湿度の条件下で7日間放置した後、120℃で5日間放置し、20℃まで徐冷した。
その後、ウレタン組成物の硬化物の一端を把持して180度剥離し、破壊状態を観察した。硬化物の凝集破壊をCF(数値は、硬化物を剥離した部分の面積に対する硬化物の凝集破壊が起きた面積(%))、プライマー/硬化物間の界面剥離をPS(数値は、硬化物を剥離した部分の面積に対するプライマー/硬化物間の界面剥離が起きた面積(%))とした。
調製した各ウレタン組成物の硬化物を厚さ2mmのダンベル状試験片(ダンベル状3号形)に切り出し、JIS K6251:2010に準拠して、破断伸び(%)を測定した。
下記の塗料1~3をそれぞれ鋼板に塗布した塗板1~3に、それぞれプライマーを用いず直接ウレタン組成物を塗布し、20℃、60%相対湿度の条件下で7日間放置させた。
その後、ウレタン組成物の硬化物の一端を把持して180度剥離し、破壊状態を観察した。硬化物の凝集破壊をCF(数値は、硬化物を剥離した部分の面積に対する硬化物の凝集破壊が起きた面積(%))、プライマー/硬化物間の界面剥離をPS(数値は、硬化物を剥離した部分の面積に対するプライマー/硬化物間の界面剥離が起きた面積(%))とした。
・塗料1:酸/エポキシ系塗料
・塗料2:アクリル/メラミン系塗料
・塗料3:アクリル/シリコン系塗料
・化合物(b1-1):上記式(5)で表されるHDI-TMP付加体(合成品)
・化合物(b1-2):上記式(8)で表されるHDIイソシアヌレート体(D170N、三井化学社製)
・接着付与剤B-1~B-5:上述した各接着付与剤
・有機スズ化合物C-1:1,3-ジアセトキシ-1,1,3,3-テトラブチル-ジスタノキサンとエチルシリケートとをモル比が1:1となるように反応させた反応物
・有機スズ化合物C-2:ジブチルスズジアセチルアセトネート(日本化学産業社製)
・第3級アミン化合物D-1:ジモルフォリノジエチルエーテル(サンアプロ社製)
・第3級アミン化合物D-2:N,N-ジメチルアミノエチルモルフォリン(エアプロダクツ社製)
・接着付与剤X-1~X-5:上述した各接着付与剤
・接着付与剤Y-1:γ-N-フェニルアミノプロピルトリメトキシシラン(KBM573、信越化学社製)
特に、接着付与剤として従来公知のHDI-TMP付加体、HDIイソシアヌレート体、アミノシランを配合した比較例1、2および8だけでなく、接着付与剤(B)と構造が近い接着付与剤X-3~X-5を配合した比較例5~7についても、接着性が劣ることが分かった。
特に、実施例1~3と実施例22との対比から、接着付与剤(B)の含有量が予備組成物100質量部に対して0.1~5.0質量部であると、破断伸びが良好となることが分かった。
また、実施例2、4および5と実施例18との対比から、有機スズ化合物(C)の含有量が上記予備組成物100質量部に対して0.001~0.5質量部であると、耐熱接着性が良好となることが分かった。
また、実施例2と実施例19~21との対比から、第3級アミン化合物(D)として用いるN,N-ジメチルアミノエチルモルフォリンの含有量が予備組成物100質量部に対して0.01~2.0質量部であり、ジモルフォリノジエチルエーテルの含有量が予備組成物100質量部に対して0.01~2.0質量部であると、高温多湿接着性や硬化性が良好となることが分かった。
Claims (4)
- 更に、有機スズ化合物(C)を含有し、
前記有機スズ化合物(C)の含有量が、前記予備組成物100質量部に対して0.001~0.5質量部である、請求項1に記載の1液湿気硬化型ウレタン組成物。 - 更に、第3級アミン化合物(D)を含有し、
前記第3級アミン化合物(D)の含有量が、前記予備組成物100質量部に対して0.01~4質量部である、請求項1または2に記載の1液湿気硬化型ウレタン組成物。 - 前記化合物(b1)が、ジイソシアネート化合物とトリメチロールプロパンまたはグリセリンとをNCO/OHが1.8~2.2となるように反応させた反応物、ジイソシアネート化合物のビウレット体、および、ジイソシアネート化合物のイソシアヌレート体からなる群から選択される少なくとも1種である、請求項1~3のいずれかに記載の1液湿気硬化型ウレタン組成物。
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