WO2008055985A1 - Composition silicone monocomposante sans etain reticulable en elastomere - Google Patents
Composition silicone monocomposante sans etain reticulable en elastomere Download PDFInfo
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- WO2008055985A1 WO2008055985A1 PCT/EP2007/062165 EP2007062165W WO2008055985A1 WO 2008055985 A1 WO2008055985 A1 WO 2008055985A1 EP 2007062165 W EP2007062165 W EP 2007062165W WO 2008055985 A1 WO2008055985 A1 WO 2008055985A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
Definitions
- the field of the invention is that of single-component silicone compositions which are stable to storage in the absence of moisture and crosslinkable to silicone elastomers by condensation reactions at room temperature and in the presence of water.
- the silicone compositions in question are tin-free.
- the cold adhesives, mastics and one-component silicone coatings are generally obtained by hydrolysis / condensation from methoxy, cetiminoxy or acetoxy-functional silicone oils, during application, by contact with the atmospheric moisture.
- patent application FR 2,557,582 A1 discloses crosslinkable one-component compositions of an elastomer containing a tin chelate catalyst, for example dibutyltin bis (acetylacetonate).
- a tin chelate catalyst for example dibutyltin bis (acetylacetonate).
- the French patent application FR 2,638,752 A1 also describes a process for functionalizing an ⁇ , ⁇ -dihydroxypolydimethylsiloxane oil, by reaction with a polyalkoxysilane, in the presence of a functionalization catalyst, lithium hydroxide.
- the functionalized oils obtained are useful for the preparation of compositions crosslinkable by condensation in the presence of water, comprising, as condensation catalyst, an organometallic compound based on tin.
- the process described in the application FR 2,638,752 A1 comprises the use of methyltrimethoxysilane, vinyltrimethoxysilane or methylvinyldimethoxysilane, compounds which have the disadvantage of causing a release of methanol during the crosslinking by condensation.
- French patent application FR 2 856 694 A1 describes, for its part, one-component silicone compositions which crosslink in the cold in the presence of water.
- the condensation reactions are catalyzed using a mixed catalyst consisting of the combination of an organic derivative of a metal (titanium, zirconium) and an organic derivative of another metal (zinc, aluminum , boron, bismuth).
- a mixed catalyst consisting of the combination of an organic derivative of a metal (titanium, zirconium) and an organic derivative of another metal (zinc, aluminum , boron, bismuth).
- These formulations have the disadvantage of releasing, when they are taken, toxic or malodorous volatile products.
- some of these products also contain catalysts based on tin salts deemed ecotoxic.
- an object of the invention is to provide single-component, tin-free, highly reactive silicone compositions despite the absence of tin catalysts.
- reactivity is meant the constitution of a chemical network which results in the increase of the hardness of the elastomer formed.
- the pause time of the elastomer composition be as short as possible, both from the point of view of the crosslinking in the mass (stability of the elastomer obtained), and from the point of view of the crosslinking in surface (removal of sticky touch from the surface).
- Another object of the invention is to provide a one-component silicone composition for general use, that is to say that its implementation is not accompanied by the emission of products considered toxic, irritating or simply smelly. .
- it is desirable that the implementation of such a silicone composition is particularly easy and fast.
- an object of the invention is to arrive at a satisfactory compromise, both from the point of view of the reactivity of the silicone composition in the presence of moisture, and from the point of view of storage stability or safety. of the silicone composition.
- the invention relates first of all to a one-component silicone composition, which is tin-free, stable to storage in the absence of moisture and capable, in the presence of water, of cross-linking by polycondensation of elastomer, preferably of adherent elastomer.
- the composition comprises at least one alkoxy-functional polyorganosiloxane (POS) oil
- the composition may include one or more of the following optional components:
- crosslinking co-catalyst D at least one organometallic compound, in which the metal is different from tin,
- At least one crosslinkable alkoxy-functional polyorganosiloxane resin E a residual amount of a functionalization catalyst F used during the preparation of the oil A and / or the resin E,
- At least one alkoxy-functional silane and / or at least one alkyl-G polysilicate at least one alkoxy-functional silane and / or at least one alkyl-G polysilicate
- silicone mastics comprising, in addition to at least one cross-linkable alkoxy-functional polyorganosiloxane (POS) oil A and a crosslinking catalyst C, at least one inorganic filler B and, preferably, at least one less a crosslinkable alkoxy-functional polyorganosiloxane resin E.
- POS cross-linkable alkoxy-functional polyorganosiloxane
- a silicone sealant may, like a silicone composition, comprise other optional components from those listed above.
- the invention relates to a silicone elastomer free of tin, obtained by crosslinking and curing a one-component silicone composition free of tin according to the invention.
- silicone elastomers find their application in many industrial fields. Among these applications include, for example, the preparation of coatings for paints, for antifouling and for antiadhesion food, the formulation of water repellents or thick joints such as cold glues, and mastics used in particular in the construction, household appliances or automobiles, as well as coatings on textile substrates.
- the one-component silicone composition described herein has all the properties of interest and specific to this type of product and has the following advantages: it has a setting kinetics very close to that of a composition comprising a tin-based catalyst;
- the silicone composition is economical and leads to crosslinked elastomers having advantageous mechanical properties.
- the elastomers obtained adhere to many supports.
- oils and the polyorganosiloxane resins will be conventionally described using the following usual notations, used to designate various siloxyl units of formula M, D, T and Q as follows:
- R may represent various saturated or unsaturated hydrocarbon groups, in particular aromatic, and optionally substituted with hetero atoms, as well as non-hydrocarbon groups.
- the meaning of R will be indicated in the description.
- the oxygen atoms are shared between two silicon atoms.
- a particular R group is indicated by quoting it by exponent after the symbol M, D or T.
- M OH represents a unit M where a group R is a hydroxyl group -OH.
- D phe2 represents a D unit whose two R groups are phenyl groups (abbreviated Phe) -C 6 H 5 .
- T OMe represents a unit T whose group R is a methoxy group -OCH3 (where Me is methyl).
- substantially linear is meant a POS oil composed of siloxyl units D further comprising siloxyl units T and / or siloxyl units Q, the number of siloxyl units T and Q being less than or equal to one percent silicon.
- the crosslinkable alkoxy-functional polyorganosiloxane oil A may be linear or substantially linear. It can also be a mixture of several silicone oils.
- the POS A oil preferably comprises a linear silicone oil of the following general formula (I):
- the groups R 1 are identical to or different from each other and each represents a monovalent hydrocarbon group, saturated or unsaturated, substituted or unsubstituted, aliphatic, cyclanic or aromatic, comprising from 1 to 13 carbon atoms,
- the groups R f are identical to or different from each other and each represents a group of formula R 2 O- (CH 2 CH 2 O) b- in which the groups R 2 are identical to or different from each other and each represents a linear alkyl or branched compound comprising 1 to 8 carbon atoms, or a cycloalkyl comprising 3 to 8 carbon atoms, and wherein b is 0 or 1,
- the groups R 3 are identical to or different from each other and each represents an oxygen atom or a divalent saturated aliphatic hydrocarbon group comprising from 1 to 4 carbon atoms,
- n is sufficient to give the oil POS A a dynamic viscosity at 25 ° C. ranging from 10 3 mPa.s to 10 6 mPa.s, - a is 0 or 1.
- POS A oil comprises a substantially linear silicone oil
- the latter also has the general formula (I) wherein D siloxyl units of formula (R 1 SiO ⁇ 2 Z 2 are replaced by siloxyl units T of formula R 1 SiO 2 and / or siloxyl units Q of formula SiO 4/2, the number of siloxyl units T and
- the silicone composition corresponds to an embodiment in which an essential component, namely the oil POS A is at least partially functionalized at its ends by one or other of the following methods: when R represents an atom oxygen: by carrying out a condensation reaction between ⁇ Si-OH units of a hydroxylated precursor A 'POS and an alkoxyl group of an alkoxysilane, in the presence of a functionalization catalyst F, or
- R 3 represents a divalent hydrocarbon group: by carrying out an addition reaction between ⁇ Si-H units of a hydrogenated precursor POS A "and an olefin group of an olefinic alkoxysilane, or alternatively by carrying out an addition reaction between an olefin group of a precursor olefinic POS A '"and a hydrogen group of a hydrogenoalkoxysilane.
- POS A oil is functionalized according to techniques known to those skilled in the art.
- the functionalized POS A oil corresponds to a stable form, in the absence of moisture, of the one-component silicone composition, or of the one-component silicone mastic, here considered.
- this stable form is that of the composition packaged in hermetically sealed cartridges, which will be opened by the operator during use and which will allow him to apply the composition or putty on all desired media.
- Crosslinking occurs in the presence of water, especially the humidity of the air.
- a hydroxylated precursor A 'of the chain-functional alkoxy-functional POS A oil is an ⁇ , o> hydroxylated polydiorganosiloxane of formula (F):
- a hydrogenated precursor A "of the alkoxy-functional POS A oil at the end of the chain is an ⁇ , o> hydrogen polydiorganosiloxane of formula (I"): with R 1 and n being as defined above in formula (I).
- a precursor A 'of the chain-functional alkoxy-functional POS A oil is a polydiorganosiloxane corresponding to the definition given above for A "except that the terminal hydrogen atoms are replaced by olefinic unsaturated groups.
- the silicone composition may comprise a crosslinkable alkoxy-functional polyorganosiloxane resin E (POS E resin).
- POS E resin crosslinkable alkoxy-functional polyorganosiloxane resin
- This resin has at least two different siloxyl units chosen from siloxyl M units of formula the siloxyl units T of formula R 1 SiO 3 Z 2 and the siloxyl units Q of formula SiO 4 Z 2 , at least one of these siloxyl units being a T or Q unit, where:
- the groups R 1 are identical to or different from each other and each represents a monovalent hydrocarbon group, saturated or unsaturated, substituted or unsubstituted, aliphatic, cyclanic or aromatic, comprising from 1 to 13 carbon atoms,
- the POS E resin has a weight content in groups R f ranging from 0.1 to 10%.
- the optional POS E alkoxy-functional resin is produced in the same way as the functionalized POS A oil, by condensation with an alkoxysilane.
- the precursor of the alkoxy-functional POS E resin is then a hydroxylated POS E 'resin corresponding to the definition given above for E, with the exception that part of the R 1 groups correspond to -OH groups.
- the -OH groups will be replaced by R 4 groups.
- the POS E resin can also be produced by reacting a precursor POS E resin bearing ⁇ Si-H units on an olefinic alkoxysilane, which resin E "meets the definition given above for E with the difference that part of the groups R 1 are now hydrogen atoms, which will be replaced by R 4 groups during the functionalization reaction.
- An alkoxy functional POS resin E can also be prepared by hydrolyzing condensation of alkyl silicates or an alkyltrialkoxysilane.
- hydrolysis-condensation can be carried out from ethyl silicate or ethyl-triethoxysilane.
- the optional POS E resin and the optional inert POS H, constituting the silicone composition it is important to specify that the groups R 1 are identical or different from each other and are selected from:
- alkyl and haloalkyl groups having from 1 to 13 carbon atoms
- cycloalkyl and halogenocycloalkyl groups having 5 to 13 carbon atoms, alkenyl groups having 2 to 8 carbon atoms,
- cyanoalkyl groups whose alkyl members have from 2 to 3 carbon atoms.
- the groups R 1 mentioned above for the oil POS A, the optional POS E resin and the optional inert H POS include:
- alkyl and haloalkyl groups having from 1 to 13 carbon atoms such as methyl, ethyl, propyl, isopropyl, butyl, pentyl, hexyl, 2-ethylhexyl, octyl, decyl, 3,3,3-trifluoropropyl, 4,4,4-trifluorobutyl, 4,4,4,3,3-pentafluorobutyl,
- cycloalkyl and halogenocycloalkyl groups having 5 to 13 carbon atoms such as cyclopentyl, cyclohexyl, methylcyclohexyl, propylcyclohexyl, 2,3-difluorocyclo-butyl, 3,4-difluoro-5-methylcycloheptyl groups, alkenyl groups having 2 to 8 carbon atoms such as vinyl, allyl, butene-2-yl,
- mononuclear aryl and haloaryl groups having from 6 to 13 carbon atoms, such as phenyl, tolyl, xylyl, chlorophenyl, dichlorophenyl or trichlorophenyl groups; cyanoalkyl groups whose alkyl members have from 2 to 3 carbon atoms, such as ⁇ -cyanoethyl and ⁇ -cyanopropyl groups.
- siloxyl units D (R 1) 2 SiO 2 Z 2 present in the dialkoxypolysiloxanes A of formula (I), the precursors A 1 and A "of formulas (F and I") and in the inert polydiorganosiloxanes
- (CH 2 ) SiO, CH 3 (CH 2 CH) SiO, CH 3 (C 6 H 5 ) SiO, (C 6 H 9 ) 2 SiO, CF 3 CH 2 CH 2 (CH 3 ) SiO,
- polymers A 1 and A "of formulas (F and I") a mixture consisting of several polymers which differ from each other by the value of the viscosity and / or the nature of the groups bonded to the silicon atoms.
- the polymers A 1 and A 'of formula (I' and I ") may include the siloxyl units T of formula R 1 SiO ⁇ and / or siloxyl units Q: SiO 4/2, in the proportion at most 1% (this percentage expressing the number of T and Q units per 100 silicon atoms).
- inert polymers H the same remarks apply to inert polymers H.
- the R 1 groups of the POS A oils, the A 1 and A "oils and the inert H poses advantageously used, because of their availability in industrial products, are the methyl, ethyl, propyl, isopropyl, n-hexyl and phenyl groups. , vinyl and 3,3,3-trifluoropropyl, More preferably at least 80% by number of such groups are methyl radicals.
- Precursor POS oils A 1 and A having a dynamic viscosity at 25 ° C ranging from 1,000 to 1,000,000 mPa.s and preferably ranging from 10,000 to 200,000 mPa.s. are used. acting inert H (optional) POSs, they exhibit a dynamic viscosity at
- 25 ° C ranging from 10 to 200,000 mPa.s and preferably from 50 to 150,000 mPa.s.
- the inert H-poses when used, can be introduced in whole or in several fractions and at several stages or at a single stage of the preparation of the composition. Any fractions may be the same or different in terms of nature and / or proportions. Preferably, H is introduced in its entirety at a single stage.
- R 1 of the alkoxy-functional POS E resins which are suitable or which are advantageously used include the various R 1 groups of the type mentioned above, for the alkoxy-functional POS oils A, POS oils, for example. precursors A 1 and A "and inert POS H. These silicone resins are branched polyorganosiloxanes E well known polymers whose methods of preparation are described in numerous patents. As concrete examples of resins include MQ resins, MDQ , TD and MDT.
- examples of optionally POS E alkoxy-functional resins that may be mentioned include POS E resins which do not comprise, in their structure, a Q-unit. More preferentially, examples of resins that may be used include resins TD and MDT functionalized comprising at least 20% by weight of T units and having a weight content of R f group ranging from 0.3 to 5%. Even more preferably, resins of this type are used, in the structure of which at least 80% by number of the groups R 1 are methyl groups.
- the functional groups R f of the optional POS E resins may be borne by the M, D and / or T units.
- alkoxy-functional POS A oils the alkoxy-functional POS E resins and the possible alkoxy-functional silanes G1
- they carry groups R f alkoxyls of formula R 2 O- (CH 2 CH 2 O) b-.
- R 2 groups which are particularly suitable are the same groups as mentioned above, for the R 1 groups of POS A oils, POS precursor oils A 1 and A "and inert polymers. H.
- R 2 groups are linear or branched alkyl groups comprising from 1 to 4 carbon atoms (methyl, ethyl, propyl, methylethyl, butyl, methyl-1-propyl, methyl-2-propyl,
- b is 0
- R f is an alkoxy group selected from ethoxy and propoxy.
- the ethoxy group is particularly preferred because, in the context of the invention, it offers the best compromise between the stability of the silicone composition and reactivity in the presence of moisture, despite the absence of a tin-based polyaddition catalyst.
- each R 3 group it represents, as has already been pointed out, an oxygen atom or a divalent hydrocarbon group.
- divalent hydrocarbon groups mention will preferably be made of methylene, ethylene, propylene and butylene groups; the ethylene group is more particularly preferred.
- each R symbol represents an oxygen atom.
- the composition may further comprise at least one functionalization catalyst F, in the presence of which the reaction proceeds precursor A 1 and A "(and optionally precursors E 1 and E") with Suitable alkoxysilane G1, reaction leading to oil POS A and resin POS E respectively.
- the functionalization catalyst F is generally residual in the composition according to the invention.
- this functionalization catalyst F can advantageously be selected from the following compounds: :
- R 3 represents an oxygen atom
- functionalization catalyst F lithium, of formula LiOH or LiOH, H 2 O. It can be used for example in solution in at least one aliphatic alcohol having 1 to 3 carbon atoms, such as, for example, methanol, ethanol, isopropanol or a mixture of these alcohols.
- an alcohol (s) is (are) present in the reaction medium, the amount employed is in the range of 0.1 to 2 parts by weight, and preferably 0.2 to 1 part by weight, per 100 parts of polymer (s) hydroxylated (s) precursor A '.
- catalyst F In most cases, from 0.001 to 5 moles of catalyst F are used per 1 mole of silanol groups ( ⁇ Si-OH) supplied, on the one hand, by the precursor (s) A 1 of the ( or of the alkoxylated oil (s) POS A and, on the other hand, by the precursor (s) E 1 of the alkoxylated (s) resin (s) POS E.
- precursor (s) A 1 of the ( or of the alkoxylated oil (s) POS A the precursor (s) E 1 of the alkoxylated (s) resin (s) POS E.
- LiOH 0.005 to 0.5 moles of LiOH are used per 1 mole of silanol groups of A 1 or E 1 .
- each R 3 symbol represents an oxygen atom derived from an alkyl polysilicate G 2. It is thus possible to prepare an alkoxy-functional POS resin E by hydrolysis-condensation of alkyl silicates or of an alkyltrialkoxy silane.
- hydrolysis-condensation can be carried out from ethyl silicate or from ethyl triethoxy silane.
- the oil POS A and the resin are the oil POS A and the resin
- the one-component polyorganosiloxane composition comprises, in addition to at least one POS A oil, at least one crosslinking catalyst C in the form of a carboxylic acid and / or a carboxylic anhydride.
- the carboxylic acid C1 comprises at least three carbon atoms, or even better still, at least five carbon atoms.
- at least one carboxylic acid from which the carboxylic anhydride C2 is derived has at least three carbon atoms.
- the crosslinking catalyst is derived from two carboxylic acids, at least one of which has at least three carbon atoms, preferably each of the two acids having at least 2 or 3 carbon atoms.
- the carboxylic acid anhydride C2 is cyclic and is derived from a dicarboxylic acid in which the carboxyl groups COOH are separated from each other by at least 3 carbon atoms.
- the crosslinking catalyst C may be chosen, preferably, from: 2-ethylhexanoic acid, octanoic acid, 2-ethylbutyric acid, iso -butyric acid, anhydrides derived from one or two of these carboxylic acids, acetic anhydride and mixtures thereof.
- the silicone composition may further comprise a mineral filler B selected from acidic or neutral mineral fillers, or mixtures thereof.
- the charge B provided is mineral and may consist of products selected from siliceous or non-siliceous materials.
- the inorganic filler B may consist of products chosen from siliceous or non-siliceous materials: from siliceous materials, preferably colloidal silicas, pyrogenation, combustion or precipitation silica powders, or amorphous diatomaceous earth silicas , crushed quartz, mixtures thereof, or among non-siliceous fillers, preferably carbon black, titanium dioxide, aluminum oxide, hydrated alumina, expanded vermiculite, unexpanded vermiculite, treated calcium carbonate, zinc oxide, mica, talc, iron oxide, barium sulfate, slaked lime, and mixtures thereof.
- siliceous or non-siliceous materials from siliceous materials, preferably colloidal silicas, pyrogenation, combustion or precipitation silica powders, or amorphous diatomaceous earth silicas , crushed quartz, mixtures thereof, or among non-siliceous fillers, preferably carbon black, titanium dioxide, aluminum oxide, hydrated alumina, expanded vermiculite,
- siliceous materials they can act as reinforcing or semi-reinforcing filler.
- the reinforcing siliceous fillers are chosen from colloidal silicas, pyrogenation (or combustion) and precipitation silica powders or their mixture.
- These powders have an average particle size of generally less than 0.1 .mu.m and a BET surface area greater than 50 m 2 / g, preferably between 100 and 350 m 2 / g.
- Semi-reinforcing siliceous fillers such as amorphous silicas, diatomaceous earths or crushed quartz may also be used.
- non-siliceous mineral materials they can be used as semi-reinforcing mineral filler or stuffing.
- these non-siliceous fillers that may be used alone or in admixture are carbon black, titanium dioxide, aluminum oxide, hydrated alumina, expanded vermiculite, unexpanded vermiculite, calcium carbonate, calcium carbonate and the like. zinc oxide, mica, talc, iron oxide, barium sulfate and slaked lime.
- These fillers have a particle size generally of between 0.001 and 300 ⁇ m and a BET surface area of less than 100 m 2 / g.
- the filler used is fumed silica powder; this silica is in amorphous form when it is intended to obtain translucent mastics.
- these fillers can be surface-modified by treatment with the various organosilicon compounds usually employed for this purpose.
- these organosilicon compounds may be organochlorosilanes, diorganocyclopolysiloxanes, hexaorganodisiloxanes, hexaorganodisilazanes or diorganocyclopolysilazanes (patents FR 1 126 884, FR 1 136 885, FR 1 236 505, GB 1 024 234).
- the treated fillers contain, in most cases, from 3 to 30% of their weight of organosilicic compounds.
- the purpose of introducing the fillers is to impart good mechanical and rheological characteristics to the elastomers resulting from the hardening of the compositions in accordance with the invention. Only one species of feedstock or mixtures of several species can be introduced.
- the silicone composition optionally comprises a crosslinking cocatalyst D.
- This crosslinking cocatalyst D is an organometallic compound in which the metal is different from tin.
- the metal of the crosslinking cocatalyst D is selected from zinc, titanium, aluminum, bismuth, zirconium, boron and mixtures thereof.
- the crosslinking cocatalyst D can be defined as follows:
- L represents a ligand ⁇ donor with or without a participation ⁇ , as for example the ligands of the type of those derivatives of acetylacetone, ⁇ -keto esters, malonic esters and acetylimines;
- C represents 0, 1, 2, 3 or 4;
- Ml is a metal selected from titanium, zirconium and mixtures thereof;
- the groups R 5 which may be identical or different, each represent a linear or branched C 1 to C 12 alkyl group
- the groups R 6 which are identical or different, each represent a linear or branched C 1 to C 20 alkyl group
- the symbol R 7 with the meaning given above in the formula (V) for R 5 ;
- the symbol L represents a ligand ⁇ donor with or without a participation ⁇ , such as ligands such as those derived from acetylacetone, ⁇ -keto esters, malonic esters and acetylimines;
- M2 is a metal of valence v selected from zinc, aluminum, bismuth, boron and mixtures thereof; E represents a number ranging from zero to v.
- the cocatalyst D consists in the combination of at least one organic derivative D1 and at least one organic derivative D2. Without this being limiting, it must be considered that the following choices are particularly appropriate:
- metal M1 titanium
- M2 metal zinc, aluminum or their mixtures.
- Dl.1 monomers of formula (II) mention may be made of: titanate or ethyl zirconate, titanate or propyl zirconate, titanate or isopropyl zirconate, titanate or zirconate.
- the monomeric metal compounds Dl.1 more particularly preferred are the following products, taken alone or in a mixture: ethyl titanate, propyl titanate, isopropyl titanate, butyl titanate (n-butyl).
- polymers D 1.2 originating from the partial hydrolysis of monomers D 1.1 mention may be made of: polymers D 1.2 originating from the partial hydrolysis of titanates or zirconates of isopropyl, butyl or 2-ethylhexyl .
- the curing catalyst D there may be mentioned: by way of examples of the symbols R 6 and R 7 in the derivatives D2.1 and D2.2 of the formulas (III) and (IV), the propyl groups, isopropyl, butyl (n-butyl), isobutyl, sec-butyl, tert-butyl, hexyl, 2-ethylhexyl, octyl, decyl and dodecyl; and as examples of the symbol L in the D2.2 derivatives of formula (IV), the acetylacetonate ligand.
- organic derivatives D2 may be mentioned: zinc dioctoate, tributyl borate, a bismuth carboxylate and aluminum acetylacetonate.
- the D2 compounds that are more particularly preferred are the following products, taken alone or as a mixture: zinc dioctoate, aluminum acetylacetonate, and aluminum butoxide (linear or branched).
- crosslinking cocatalyst D is chosen from: tetrabutyl titanate, zinc bis (ethyl-2-hexanoate), zinc bis-octoate, aluminum acetyl acetonate, tributyl borate , bismuth carboxylate, tetrapropyl zirconate, and mixtures thereof.
- the one-component silicone compositions according to the present invention may also contain one or more auxiliary agent (s) I such as, for example, per 100 parts by weight of POS A oil: - optionally from 0.1 to 10 parts of an adhesion promoter II,
- plasticizers 15 belonging for example to the group of alkylbenzenes with a molecular weight of greater than 200 g / mol, comprising a branched or unbranched alkyl radical having from 10 to 30 carbon atoms; thixotropic agents 16; stabilizing agents 17 (such as in particular: an organic acid salt of iron or cerium, for example iron or cerium octoate; cerium, cerium hydroxide, iron oxide, CaO oxide, MgO oxide); colored pigments 18.
- adhesion promoter II is preferably selected from organosilicon compounds bearing both (1) hydrolysable groups bonded to the silicon atom and
- VTMS vinyltrimethoxysilane
- MEMO methacryloxypropyltrimethoxysilane
- the one-component silicone composition comprises:
- auxiliary agent (s) I from 0 to 20 parts by weight of auxiliary agent (s) I, the complement to 100% by weight of oil POS A, with the condition according to which the oil POS A represents at least 45% by weight, preferably at least 55% by weight, of the composition.
- the molar ratio D: C is between 1: 1 and 4: 1 moles of metal of cocatalyst D per mole of catalyst C.
- compositions according to the invention harden at room temperature, especially at temperatures between 5 and 35 ° C, in the presence of moisture.
- the hardening (or crosslinking) is carried out from the outside towards the inside of the mass of the composition. Firstly, on the surface, a skin is formed, then the reticulation continues in the mass. The formation time of the skin is faster in the presence of a branched carboxylic acid crosslinking catalyst than in the presence of only an organometallic cocatalyst.
- compositions can be used for multiple applications such as grouting in the building industry, assembly and bonding of various materials (metals, plastics such as PVC, PMMA, natural and synthetic rubbers; wood, cardboard, earthenware, brick, glass, stone, concrete, masonry), and this in the context of the construction industry as well as that of the automobile, appliance and home appliance industries. electronic.
- the subject of the present invention is also (second subject of the invention) a tin-free elastomer capable of adhering to different substrates and obtained by crosslinking and hardening of the single-component silicone composition described above. .
- tin-free one-component silicone compositions according to the present invention are prepared in the absence of moisture by operating in a closed reactor equipped with stirring, in which a vacuum can be evacuated, if necessary, and then optionally replaced air expelled by an anhydrous gas, for example by nitrogen.
- Alkoxy-functional POS E optionally olefinic alkoxysilane (which may be silane G1), and / or G2 alkyl polysilicate, functionalization catalyst F, inert POS H (optional); • then in a step 2, the reaction mixture of step 1 completed by the addition of constituents B (optional), C, I (optional), H (optional) and D (optional); and
- Step 1 A '+ possibly E' + G + F + possibly D + B, with evacuation at this stage of the volatile materials;
- Step 2 C + G + optionally I + possibly D + D.
- equipment include: slow dispersers, blade mixers, propeller, arm, anchor, planetary kneaders , hook mixers, single or multiple screw extruders.
- each of the steps implemented in this preparation is conducted at a temperature within the temperature range from 10 to 110 0 C.
- each of the steps is conducted at a temperature ranging from 15 to 90 0 C.
- Step 1 is carried out for a sufficient period of time (for example from 10 seconds to 10 minutes) to carry out a complete functionalization reaction or as close as possible to the maximum degree of functionalization accessible under the operating conditions chosen.
- Step 2 is conducted for a sufficient period of time (for example from 10 seconds to 30 minutes) to arrive at homogeneous compositions.
- Step 3 is generally conducted under reduced pressure between
- a condensation catalyst C and optionally a crosslinking cocatalyst D are added to the slurry obtained according to Preparation 1.
- 0.7 g is added.
- the various catalysts C are 2-ethyl hexanoic acid, octanoic acid, 2-ethyl butyric acid, isobutyric acid and acetic anhydride.
- the various co-catalysts D are butyl titanate, zinc bis (2-ethyl hexanoate).
- Various mixtures of catalyst C and cocatalyst D are also tested:
- pyrogenation silica B (Degussa Aerosil 150) developing a specific surface area of 150 m 2 / g, are incorporated at moderate stirring speed (10 min at 160 rpm) and then more vigorous (4 min at 400 rpm). ) to complete the dispersion in the mixture.
- a viscoelastic fluid is obtained which is rather thick and not very flowing.
- the resulting slurry is degassed under vacuum (less than 50mbar for 6 min at 130rpm) and then transferred to a storage container.
- a condensation catalyst C and cocatalysts D To obtain an elastomer crosslinking with atmospheric moisture, it is necessary to add to the slurry obtained according to Preparation 3, a condensation catalyst C and cocatalysts D. To compare a catalyst and a co-catalyst according to the invention, with a commercial catalyst based solely on an organic titanium compound, 3.8 mmol of titanium catalyst per 100 g of impregnation are introduced using a fast mixer (2 times 20 sec at 2000 rpm).
- the different catalysts are:
- titanium tetrakis ethyl-2 hexanolate
- Tyzor TOT of Dupont
- Examples 1 to 6 use the slurry prepared according to Preparation 2.
- Examples 7 and 8 use the slurry prepared according to Preparation 4.
- butyl titanate is substituted with a C8 carboxylic acid, the setting kinetics are faster, especially if the carboxylic acid is branched, as is 2-ethyl hexanoic acid.
- butyl titanate with 2-ethyl hexanoic acid makes it possible to have faster crosslinking kinetics than the two components taken separately.
- the proportion of the two constituents in the mixture plays a role.
- the molar proportion of 2 moles of butyl titanate per 1 mole of 2-ethyl hexanoic acid is that which gives the fastest setting kinetics.
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200780046920A CN101743271A (zh) | 2006-11-09 | 2007-11-09 | 可交联成弹性体的无锡的单组分有机硅组合物 |
EP07822453A EP2089461A1 (fr) | 2006-11-09 | 2007-11-09 | Composition silicone monocomposante sans etain reticulable en elastomere |
US12/514,243 US20100234510A1 (en) | 2006-11-09 | 2007-11-09 | Tin-free single-component silicone compositions crosslinkable into elastomeric state |
JP2009535746A JP5261395B2 (ja) | 2006-11-09 | 2007-11-09 | エラストマーに架橋し得る単一成分の無錫シリコン組成物 |
KR1020097011834A KR101135918B1 (ko) | 2006-11-09 | 2007-11-09 | 엘라스토머로 가교될 수 있는 주석을 함유하지 않는 단일-성분 실리콘 조성물 |
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FR0609785A FR2908420A1 (fr) | 2006-11-09 | 2006-11-09 | Composition silicone monocomposante sans etain reticulable en elastomere |
FR0609785 | 2006-11-09 |
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WO2008055985A1 true WO2008055985A1 (fr) | 2008-05-15 |
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PCT/EP2007/062165 WO2008055985A1 (fr) | 2006-11-09 | 2007-11-09 | Composition silicone monocomposante sans etain reticulable en elastomere |
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US (1) | US20100234510A1 (fr) |
EP (1) | EP2089461A1 (fr) |
JP (1) | JP5261395B2 (fr) |
KR (1) | KR101135918B1 (fr) |
CN (2) | CN101743271A (fr) |
FR (1) | FR2908420A1 (fr) |
WO (1) | WO2008055985A1 (fr) |
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EP2492323A1 (fr) | 2011-02-23 | 2012-08-29 | Akzo Nobel Coatings International B.V. | Composition résistante au bio-encrassement |
WO2013024106A1 (fr) | 2011-08-18 | 2013-02-21 | Akzo Nobel Coatings International B.V. | Composition anti-encrassement comprenant des stérols et/ou des dérivés de ceux-ci |
WO2014131695A1 (fr) | 2013-02-26 | 2014-09-04 | Akzo Nobel Coatings International B.V. | Compositions antisalissure avec un polymère ou oligomère contenant un oxyalkylène fluoré |
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- 2007-11-09 KR KR1020097011834A patent/KR101135918B1/ko not_active IP Right Cessation
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JP2012510531A (ja) * | 2008-11-25 | 2012-05-10 | ブルースター・シリコーンズ・フランス | グアニジン構造を有する化合物及びそのオルガノポリシロキサン重縮合触媒としての使用 |
EP2492323A1 (fr) | 2011-02-23 | 2012-08-29 | Akzo Nobel Coatings International B.V. | Composition résistante au bio-encrassement |
WO2013024106A1 (fr) | 2011-08-18 | 2013-02-21 | Akzo Nobel Coatings International B.V. | Composition anti-encrassement comprenant des stérols et/ou des dérivés de ceux-ci |
US9388316B2 (en) | 2011-08-18 | 2016-07-12 | Akzo Nobel Coatings International B.V. | Fouling-resistant composition comprising sterols and/or derivatives thereof |
WO2014131695A1 (fr) | 2013-02-26 | 2014-09-04 | Akzo Nobel Coatings International B.V. | Compositions antisalissure avec un polymère ou oligomère contenant un oxyalkylène fluoré |
WO2015082408A2 (fr) | 2013-12-03 | 2015-06-11 | Akzo Nobel Coatings International B.V. | Procédé de revêtement d'une vieille couche de revêtement sur un substrat, et composition de revêtement pouvant être utilisée dans ce procédé |
CN105489418A (zh) * | 2015-12-31 | 2016-04-13 | 宝鸡市晨光真空电器有限责任公司 | 用于户外高压真空断路器的固封式极柱模块的固封工艺 |
CN105950099B (zh) * | 2016-04-27 | 2018-12-07 | 深圳市利群通电子科技有限公司 | 一种单组分脱醇型室温硫化硅橡胶及其制备方法、应用 |
CN105950099A (zh) * | 2016-04-27 | 2016-09-21 | 宁波高新区夏远科技有限公司 | 一种单组分脱醇型室温硫化硅橡胶及其制备方法、应用 |
WO2018134124A1 (fr) | 2017-01-17 | 2018-07-26 | Akzo Nobel Coatings International B.V. | Composition de revêtement antisalissure, substrat revêtu d'une telle composition de revêtement et utilisation de cette composition de revêtement |
WO2018178319A1 (fr) * | 2017-03-29 | 2018-10-04 | Elkem Silicones France Sas | Composition silicone reticulant par polyaddition utile pour le surmoulage de pieces |
US11370936B2 (en) | 2017-03-29 | 2022-06-28 | Elkem Silicones France Sas | Polyaddition-crosslinking silicone composition that is useful for the overmoulding of parts |
WO2019115020A1 (fr) | 2017-12-14 | 2019-06-20 | Akzo Nobel Coatings International B.V. | Composition de revêtement antisalissure, substrat revêtu d'une telle composition de revêtement et utilisation de cette composition de revêtement |
WO2019115021A1 (fr) | 2017-12-14 | 2019-06-20 | Akzo Nobel Coatings International B.V. | Substrat revêtu d'un système de revêtement multicouche et procédé de lutte contre l'encrassement biologique aquatique sur des objets fabriqués par l'homme à l'aide d'un tel système de revêtement multicouche |
WO2020011839A1 (fr) | 2018-07-13 | 2020-01-16 | Akzo Nobel Coatings International B.V. | Composition de couche d'accrochage |
WO2022207681A1 (fr) | 2021-03-30 | 2022-10-06 | Akzo Nobel Coatings International B.V. | Compositions de revêtement antisalissure |
Also Published As
Publication number | Publication date |
---|---|
KR20090085678A (ko) | 2009-08-07 |
CN101743271A (zh) | 2010-06-16 |
CN103937262A (zh) | 2014-07-23 |
US20100234510A1 (en) | 2010-09-16 |
JP5261395B2 (ja) | 2013-08-14 |
JP2010509424A (ja) | 2010-03-25 |
EP2089461A1 (fr) | 2009-08-19 |
FR2908420A1 (fr) | 2008-05-16 |
KR101135918B1 (ko) | 2012-04-16 |
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