JPH0673949B2 - Veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a decorative board, and more specifically, it has excellent moisture permeability while being resin-coated.

(Prior Art) Unsaturated dibasic acids such as maleic anhydride and fumaric acid (generally, saturated dibasic acids such as phthalic anhydride and adipic acid are used as unsaturated polyester resin compositions for coating in conventional decorative boards. A typical example is one in which a mixture) is reacted and condensed with glycols such as ethylene glycol, diethylene glycol and propylene glycol and dissolved in a polymerizable monomer such as styrene.

(Problems to be Solved by the Invention) In the above-mentioned conventional resin composition, importance is attached to water resistance, and little consideration is given to water permeability.

Therefore, there is a problem that dew condensation is likely to occur, and the humidity control ability is hardly expected.

The present invention has been made in view of such circumstances, the object is to have an excellent water permeability while having a conventional coating film function and transparency (depth) is improved, It is also an object of the present invention to provide a decorative board coated with a resin composition for water-permeable coating, which has good adhesiveness for most paints.

(Means for Solving the Problems) In order to achieve such an object, the present invention provides an unsaturated polyester with hydroxyethyl methacrylate and / or hydroxyethyl acrylate.
The unsaturated polyester resin composition for water-permeable coating, which is mixed in the range of 40 to 150 parts by weight with respect to parts by weight, is applied to a wood base material and then the composition is cured.

In the present invention, the unsaturated polyester includes an unsaturated dibasic acid such as maleic anhydride or fumaric anhydride (generally, a saturated dibasic acid such as phthalic acid or adipic acid is mixed) and ethylene glycol, diethylene glycol or propylene glycol. The thing which carried out the reaction condensation of glycols is mentioned.

In adjusting the blending amount of the hydroxyl group-containing (meth) acrylate monomer with respect to the unsaturated polyester, the water permeability becomes higher as the amount of the hydroxyl group-containing (meth) acrylate monomer used is larger than the unsaturated polyester within an appropriate ratio. However, if the amount exceeds the proper ratio and the amount becomes large, the resin composition easily penetrates into the wood base material and the shrinkage at the time of curing becomes large, so that good gloss cannot be obtained. Further, the water permeability becomes excessive, and defects such as blisters due to lack of water resistance are likely to occur during water absorption.

On the other hand, if the amount is too small, the desired water permeability will be insufficient, and the dew condensation prevention effect and humidity control ability will not be exhibited. Also,
The curability of the resin composition decreases.

Further, as a curing catalyst or a curing accelerator, in heat curing, cyclohexanone peroxide, cumene hydroperoxide, lauroyl peroxide, tert-butyl perbenzoate, di-tert-butyl peroxide, benzoyl peroxide or the same paste, azo There are bisisobutyronitrile and the like, and those diluted with an appropriate amount of dimethyl phthalate, dibutyl phthalate, phosphate and the like may be used. For room temperature curing, a system of peroxide-accelerator is generally contained, and common examples include methyl ethyl ketone peroxide, cobalt naphthenate or cobalt octylate, and benzoyl peroxide.
There are dimethylaniline or toluidine, but their content is 1% by weight with respect to the resin, for example, methyl ethyl ketone peroxide, and cobalt naphthenate.
0.5 wt% is desirable. In addition to this, metallic soaps and several organic compounds are also effective as accelerators.

Further, depending on the purpose of use, for example, pigments, dyes, viscosity modifiers, anti-sagging agents, gloss and leveling materials, anti-settling agents, color separation inhibitors, pigment dispersants, anti-skinning agents, fillers, reinforcing agents. , Various additives such as release agents are added.

(Examples) Hereinafter, the present invention will be described in detail with reference to Examples.

The decorative board is an unsaturated polyester resin composition for water-permeable coating, which is obtained by mixing hydroxyethyl methacrylate and / or hydroxyethyl acrylate in an unsaturated polyester in a range of 40 to 150 parts by weight with respect to 100 parts by weight of the unsaturated polyester. It is formed by applying the composition to a wood base material and then curing the composition.

Examples of the unsaturated polyester resin composition for water-permeable coating are shown below.

Example I 0.95 mol of propylene glycol, diethylene glycol
0.2 mol, phthalic anhydride 0.4 mol and maleic anhydride 0.
An unsaturated polyester resin liquid was prepared by adding 100 parts by weight of 2-hydroxyethyl methacrylate to 100 parts by weight of the reaction liquid obtained by reacting and condensing 6 mol.

Example II Propylene glycol 0.2 mol, trimethylolpropane diallyl ether 0.2 mol, diethylene glycol 0.6
An unsaturated polyester resin liquid was prepared by adding 50 parts by weight of 2-hydroxyethyl methacrylate to 100 parts by weight of a reaction liquid obtained by reacting and condensing 0.2 mol of ethylene glycol and 1.02 mol of maleic anhydride.

Example III 1.3 mol of propylene glycol, diethylene glycol
An unsaturated polyester resin solution was prepared by adding 66 parts by weight of 2-hydroxyethyl methacrylate to 100 parts by weight of a reaction solution obtained by reacting and condensing 1.3 mol, 0.7 mol of het acid, 0.3 mol of phthalic anhydride and 1.4 mol of maleic anhydride.

Next, a general unsaturated polyester resin is shown for comparison with the resin composition in the decorative board of the present invention.

Comparative Example Propylene glycol 2 mol, diethylene glycol 2
An unsaturated polyester resin was prepared by adding 50 parts by weight of styrene to 100 parts by weight of a reaction solution obtained by reacting and condensing 2 mol of phthalic anhydride and 2 mol of maleic anhydride.

Table 1 shows the compounding compositions of Examples I to III and Comparative Examples for these resin compositions.

Next, a water-permeable unsaturated polyester resin-coated veneer of the present invention and a water-permeable unsaturated polyester resin-coated veneer of Comparative Example In order to show the difference, the resin liquid C obtained in Example II and the resin liquid D of the comparative example were applied to A having a wood board adhered to the veneer and B having a decorative paper adhered to the veneer, respectively. Compared with those cured at room temperature.

The results are shown in Table 2.

(Effects of the Invention) Therefore, the present invention has the following advantages.

Since the resin composition coated on the wooden base material has water permeability, dew condensation can be prevented, and it is particularly suitable for a constituent material in a humid place such as a kitchen or a bathroom.

Since it has a humidity control ability, it is particularly useful for adjusting the humidity of a wood base material.

The resin composition is excellent in impregnation property and adhesion property to the wood base material and excellent.

The coating surface has good transparency (depth) and is particularly useful for applications where gloss is required.

Claims (1)

[Claims] 1. An unsaturated polyester resin composition for a water-permeable coating, comprising an unsaturated polyester compounded with hydroxyethyl methacrylate and / or hydroxyethyl acrylate in an amount of 40 to 150 parts by weight per 100 parts by weight of the unsaturated polyester. A decorative board obtained by applying the composition to a wood base material and then curing the composition.