JP2006015613A - Laminated plywood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide laminated plywood which (1) prevents the occurrence of a crack in various SL materials and (2) demonstrates good adhesion to plywood by mixing a resin emulsion containing a resin of 0&deg;C or below with a curable substance, applying the mixture directly or indirectly on the surface of the plywood, and drying it. <P>SOLUTION: In the laminated plywood, a compound comprising at least one curable substance (1) selected from a hydraulic substance and an air hardening substance and the resin emulsion (2) containing the resin having a glass transition temperature of 0&deg;C or lower is laminated on at least one surface of the plywood. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

  The present invention relates to a plywood having good crack resistance and adhesion of a hardened cement or a gypsum hardened material when, for example, a cement-based self-leveling (hereinafter abbreviated as SL) material or a gypsum-based SL material is applied to the plywood surface and dried. Is. More specifically, a composition comprising one or more curable substances (1) selected from a hydraulic substance and a pneumatic substance on the plywood surface and a resin emulsion (2) containing a resin having a glass transition temperature of 0 ° C. or lower, It relates to laminated plywood.

The various plywood surfaces coated with various SL materials and dried are used on the floors and walls of building materials. Conventionally, a resin emulsion or the like is sometimes applied in order to improve the adhesion between the plywood and various SL materials and the SL material.
However, in recent years, cracking of the SL material has become more likely to occur due to diversification of usage conditions of floors and walls. Moreover, in order to prevent formaldehyde emission from a plywood, the process of mix | blending components, such as paraffin, may be given at the time of plywood preparation, etc., and the transfer | transfer to the surface of paraffin etc. may become a problem. As a result, there is a further increase between the conventional resin emulsion and the plywood, resulting in poor adhesion between the plywood and the SL material.

  In the present invention, a resin emulsion containing a resin of 0 ° C. or lower is combined with a curable substance, and applied to the plywood surface and dried to prevent (1) cracking of various SL materials, and (2) excellent plywood and An object of the present invention is to provide a laminated plywood that exhibits the adhesiveness of the above.

In order to solve the above problems (1) to (2) at the same time, the present invention finds a laminated plywood in which a resin emulsion having a specific glass transition temperature and a curable substance are applied and cured on the surface of the plywood. Invented the invention.
That is, the present invention
[1] A composition comprising at least one curable substance (1) selected from a hydraulic substance and a pneumatic substance, and a resin emulsion (2) containing a resin having a glass transition temperature of 0 ° C. or lower, is added to at least a plywood. Laminated plywood, characterized by being laminated on one surface,
[2] The ratio of at least one curable material (1) selected from hydraulic materials and pneumatic materials to the resin emulsion (2) containing a resin having a glass transition temperature of 0 ° C. or less is 100 (1). The laminated plywood according to [1] above, wherein (2) is 5 to 50 parts by mass (solid content) with respect to parts by mass,
[3] The resin emulsion containing a resin having a glass transition temperature of 0 ° C. or lower as described in [1] 1 or [2] above is selected from aromatic vinyl monomers and (meth) acrylic acid ester monomers Laminated plywood obtained by emulsion polymerization of a monomer composition containing the above monomers,
It is.

  The laminated plywood of the present invention has the effect of exhibiting excellent adhesion between the SL material and the plywood without occurrence of cracking when various SL materials are applied and cured.

The present invention will be specifically described below.
The plywood used in the present invention refers to various plywoods defined by JAS, and the type is not particularly limited.
The hydraulic substance used in the present invention refers to a substance that hardens by a hydration reaction in air or water, and includes, for example, cement. The cement is defined by, for example, JIS R5210 (Portland cement), R5211 (blast furnace cement), R5212 (silica cement), R5213 (fly ash cement), ordinary Portland cement, early-strength Portland cement, ultra-early-strength Portland cement, Medium-heated Portland cement, sulfate-resistant Portland cement, blast furnace cement, silica cement, fly ash cement can be used, and a special cement described in the common sense of cement (issued in March 1994) by the Japan Cement Association Various cements such as white Portland cement, cement-based solidified material, alumina cement, super-hard cement, colloid cement, Yui cement, geothermal cement, expanded cement, and other special cements can be used.

The air-hardening substance used in the present invention is a substance that cures by reacting with carbon dioxide in the air, and also refers to a substance that hardens only after moisture evaporates, such as gypsum. Examples of the substance that reacts with carbon dioxide in the air and hardens include lime-based plaster, such as plaster slaked lime as defined in JIS A6902, dolomite plaster as defined in JIS A6903, and the like.
The type of the resin emulsion containing a resin having a glass transition temperature of 0 ° C. or lower used in the present invention is not particularly limited. Examples include acrylic, acryl-styrene, styrene-butadiene, acrylonitrile-butadiene, vinyl acetate, ethylene-vinyl acetate, urethane, chloroprene, and the like.

In the present invention, the ratio of one or more curable substances (1) selected from hydraulic substances and pneumatic substances to the resin emulsion (2) containing a resin having a glass transition temperature of 0 ° C. or less is (1) being 100. (2) is 5-50 mass parts (solid content) with respect to mass parts. When (1) is 100 parts by mass, (2) is 5 parts by mass (solid content) or more and crack resistance and adhesion are good, and (2) is 50 parts by mass (solid content) or less and crack resistance. Good adhesion. More preferably, (1) is 10 to 40 parts by mass (solid content) with respect to 100 parts by mass.
In the present invention, the resin emulsion (2) containing a resin having a glass transition temperature of 0 ° C. or lower contains one or more monomers selected from aromatic vinyl monomers and (meth) acrylic acid ester monomers. An acrylic emulsion obtained by emulsion polymerization of the monomer composition and a styrene-acrylic emulsion are preferred.

Examples of the aromatic vinyl monomer include styrene, vinyl toluene, α-methyl styrene, β-methyl styrene and the like. Styrene is preferred.
Examples of (meth) acrylic acid ester monomers include methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, isobutyl acrylate, hexyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, lauryl acrylate, benzyl acrylate, and phenyl. Examples include acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate, isobutyl methacrylate, hexyl methacrylate, cyclohexyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, benzyl methacrylate, and phenyl methacrylate. Preferred are butyl acrylate, 2-ethylhexyl acrylate, and methyl methacrylate.

In order to improve various qualities and physical properties, monomer components other than those described above can be used. Examples of monomers other than those described above include (a) amide group-containing vinyl monomers, (b) cyano group-containing vinyl monomers, (c) crosslinkable monomers, and (d) hydroxyl group-containing vinyl monomers. And (e) an unsaturated carboxylic acid monomer, (f) other ethylenically unsaturated monomers, and the like.
There is no restriction | limiting in particular regarding the method of emulsion polymerization, A conventionally well-known method can be used. That is, based on a monomer composition, a radical polymerization initiator, a non-reactive surfactant, a reactive surfactant, and other additive components such as a chain transfer agent used as necessary in an aqueous medium. This is a method of polymerizing a monomer composition in a dispersion system as a composition component. In the polymerization, the composition of the supplied monomer composition is made constant throughout the entire polymerization process, and the morphological composition change of the latex particles produced is changed by changing the polymerization process sequentially or continuously. Various methods can be used as desired.

In the present invention, the glass transition temperature of the resin is preferably 0 ° C. or lower. The glass transition temperature is 0 ° C. or less, and the crack resistance and the adhesion to the plywood are good. More preferably, the glass transition temperature is −10 ° C. to −60 ° C.
The glass transition temperature of the polymer referred to in the present invention can be defined by the following formula from the glass transition temperature of the monomer homopolymer and the copolymerization ratio of the monomer.
1 / Tg = W1 / Tg1 + W2 / Tg2 + ...
Tg: Glass transition temperature (° K) of a polymer comprising monomers 1, 2...
W1, W2...: Mass fraction of monomer 1, monomer 2,..., Where W1 + W2 +.
Tg1, Tg2,...: Glass transition temperature (° K) of homopolymer of monomer 1, monomer 2,.

  The Tg (° K) of the monomer homopolymer used in the calculation is described in, for example, the polymer handbook (Jhon Willy & Sons). The numerical value used in this application is illustrated. The value in parentheses indicates the Tg of the homopolymer. Polystyrene (373 ° K), polymethyl methacrylate (378 ° K), polybutyl acrylate (219 ° K), poly 2-ethylhexyl acrylate (205 ° K), polyacrylic acid (379 ° K), polymethacrylic acid (403 ° K), polyacrylonitrile (373 ° K), poly-2-hydroxyethyl acrylate (258 ° K), and poly-2-hydroxyethyl methacrylate (328 ° K).

  In order to improve the performance, the following materials may be blended in the resin emulsion of the present invention. For example, water-soluble resins, solvents, plasticizers, antifoaming agents, thickeners, leveling agents, dispersants, coupling agents, colorants, water resistance agents, lubricants, pH adjusters, preservatives, inorganic pigments, organic Examples include pigments, surfactants, and crosslinking agents such as epoxy compounds, polyvalent metal compounds, and isocyanate compounds. Also, water reducing agents and fluidizing agents (polycarboxylic acid, melamine sulfonic acid, naphthalene sulfonic acid, lignin sulfonic acid, etc.), shrinkage reducing agents (glycol ether, polyether, etc.), cold-resistant agents (calcium chloride) , Silicates, etc.), waterproofing agents (stearic acid, silicones, etc.), rust inhibitors (phosphates, nitrites, etc.), viscosity modifiers (methylcellulose, hydroxyethylcellulose, polyvinyl alcohol, etc.), setting modifiers (phosphoric acid) Salt etc.) may be added.

  There are various types of formulations comprising one or more curable substances (1) selected from the hydraulic substance and the pneumatic substance of the present invention and a resin emulsion (2) containing a resin having a glass transition temperature of 0 ° C. or lower. In order to improve quality and physical properties, fillers, water reducing agents and fluidizing agents mentioned above (polycarboxylic acids, melamine sulfonic acids, naphthalene sulfonic acids, lignin sulfonic acids, etc.), shrinkage reducing agents (glycols) Ether-based, polyether-based, etc.), cold-resistant agents (calcium chloride, silicates, etc.), waterproofing agents (stearic acid, silicon-based, etc.), rust inhibitors (phosphates, nitrites, etc.), viscosity modifiers (methylcellulose, Hydroxyethyl cellulose, polyvinyl alcohol, etc.), setting modifiers (phosphate, etc.), swelling agents (etringite, lime, etc.), colorants (iron oxide, chromium oxide, etc.), antifoaming (Silicone, mineral oils, etc.), reinforcing materials (steel fibers, glass fibers, synthetic fibers, etc.), surfactants (anions, nonions, cationics, etc.), thickeners, leveling agents, film-forming aids, solvents, Examples thereof include a plasticizer, a dispersant, a water resistant agent, and a lubricant.

  As fillers, sand, silica sand, cold water sand, natural and artificial lightweight aggregates and the like generally used for cement mortar can be used, and inorganic or organic pigments can also be used. For example, inorganic pigments include magnesium and calcium. , Zinc, barium, titanium, aluminum, antimony, lead and other metal oxides, hydroxides, sulfides, carbonates, sulfates or silicate compounds. Specific examples include calcium carbonate, kaolin, talc, titanium dioxide, aluminum hydroxide, silica, gypsum, barite powder, alumina white, and satin white. Examples of organic pigments include solid polymer fine powders such as polystyrene, polyethylene, and polyvinyl chloride.

In this invention, it is preferable that the usage-amount of a filler is (1) 5-500 mass parts of fillers with respect to 100 mass parts. With 5 parts by mass or more of filler, cracking resistance and adhesion are good. On the other hand, crack resistance is good at 500 parts by mass or less. Preferably it is the range of 50-400 mass parts.
There is no restriction | limiting in particular regarding the manufacturing method of the laminated plywood of this invention, It can manufacture by a conventionally well-known method. That is, a composition comprising one or more curable substances (1) selected from a hydraulic substance and a pneumatic substance and a resin emulsion (2) containing a resin having a glass transition temperature of 0 ° C. or lower is prepared, and then plywood Apply to the surface of and laminate. There are no particular restrictions on the application method, and examples include brush coating, trowel coating, spray coating, roller coating, brush coating, spatula coating, ruler coating, and dragonfly coating. Is mentioned. After application, drying is performed, but the drying method, drying conditions, and the like are not particularly limited, and examples include room temperature drying and forced drying.

  One or more curable substances selected from the hydraulic substance and the pneumatic substance of the present invention (1) A composition comprising a resin emulsion (2) containing a resin having a glass transition temperature of 0 ° C. or less is applied to the surface of the plywood. They may be laminated directly, or may have a multilayer structure as necessary. For example, there may be a layer of paint or the like under the formulation.

The present invention will be described based on examples. However, the embodiments of the present invention are not limited thereto. In addition, all the parts in the examples indicate the number of parts as they are (that is, the resin emulsion is the number of parts containing water itself). “Part” means “part by mass” unless otherwise specified.
[Measurement of physical properties]
Each characteristic was calculated | required as follows.
(1) Cracking property:
Plywood laminated with a mixture of curable substance and resin emulsion is subjected to JIS A6909 (finishing coating material for construction) 7.11 Heated / cooled repeated test conditions, and the cured resin cement mortar is left for 20 cycles of repeated heating and cooling. did. Thereafter, cracking was visually determined.
(2) Adhesion:
a. Normal adhesion A plywood laminated with a compound of a curable substance and a resin emulsion is bonded to a plywood and a cured compound in accordance with 7.2 bond strength test of JIS A1171-2000 (Testing method for polymer cement mortar). Adhesion was measured.
b. After heating / cooling cycle: Plywood laminated with a mixture of a curable substance and a resin emulsion is subjected to JIS A6909 (finishing coating material for construction) 7.11 Repeated testing for heating / cooling, and the cured resin cement mortar is left to cool. After 10 repeated cycles, a. The adhesion was measured in the same manner as described above.

[Examples 1-2]
A laminated plywood was produced using the formulation shown in Table 1. The production is as follows. The compound is applied to a commercially available plywood so as to be 1.5 kg / m ² . It was dried at room temperature for 1 day, and then a commercial cement-based SL material was applied to 20 kg / m ² and cured for 2 weeks.
Then, (1) cracking property and (2) adhesion test were performed. The results are shown in Table 1.

[Examples 3 to 4]
A paraffin 5% toluene solution was applied to the surface of the plywood so as to be 1 g / m ² to prepare a model plywood of paraffin-containing plywood.
Using this model plywood, the composition shown in Table 1 was produced in the same manner as in Example 1 to produce a laminated plywood. Further, as in Example 1, (1) cracking property and (2) adhesion test were performed. The results are shown in Table 1.

[Comparative Examples 1-3]
Using the model plywood used in Example 3, the composition shown in Table 2 was produced to produce a laminated plywood. In the same manner as in Example 1, (1) cracking property and (2) adhesion test were performed. The results are shown in Table 2.
Comparative Example 1 is an example in which no resin emulsion is used, and Comparative Example 2 is an example in which only a resin emulsion is used. Comparative Example 3 is an example using a resin emulsion containing a resin having a glass transition temperature of 10 ° C.

  The laminated plywood of the present invention can be suitably used in the field of floor and wall building members by applying and curing various SL materials on the surface. In other cases, for example, cement mortar, polymer cement mortar, cement paste, lime-based plaster, or the like can be applied and cured on the surface, and can be used as a building preparation material.

Claims (3)

  At least one surface of a plywood comprising a composition comprising at least one curable substance (1) selected from hydraulic and air-hardening substances and a resin emulsion (2) containing a resin having a glass transition temperature of 0 ° C. or lower A laminated plywood, characterized in that it is laminated.   The ratio of one or more curable materials (1) selected from hydraulic materials and air-hard materials to a resin emulsion (2) containing a resin having a glass transition temperature of 0 ° C. or lower is such that (1) is 100 parts by mass. On the other hand, (2) is 5-50 mass parts (solid content), The laminated plywood of Claim 1 characterized by the above-mentioned.   The resin emulsion containing a resin having a glass transition temperature of 0 ° C. or less according to claim 1 or 2 comprises at least one monomer selected from an aromatic vinyl monomer and a (meth) acrylate monomer. A laminated plywood obtained by emulsion polymerization of a monomer composition containing the laminated plywood.