JPS61160248A - Damp-proof laminated board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a moisture-proof laminate, and the surface decoration of composite po-V, which is called a paint base material, is made by laminating this laminate to particle board or plywood and integrating it. Later, we developed a moisture-proof laminate that greatly reduces the permeation of water vapor, which is the cause of eye thinning and the disturbance of the reflection pattern on the surface due to diffused reflection of light due to uneven surface smoothness or spot-like pinholes. This is what we provide.

Conventional technology Thermosetting synthetic resin laminate of composite board made by laminating thermosetting synthetic resin laminates such as melamine resin, phenol resin, polyester resin, DATSUZO (diallyl phthalate) resin on the surface of particle board or plywood. By painting the surface of the plate with a colored polyester resin or the like, followed by curing and polishing, a decorative paint with an excellent surface appearance can be obtained at low cost. For this reason, decorative boards manufactured by this method are used in large quantities in fields such as musical instruments, furniture, and building materials.

However, in the surface decoration process after painting in the above manufacturing process, moisture in the particle board or plywood and moisture liberated during the curing stage of the adhesive become water vapor and permeate the thermosetting synthetic resin laminate layer. Then, it migrates to the surface of the makeup pot V. As a result, a spot-like appearance defect called a thinning of the mouth occurs.

From the above point of view, moisture management throughout the entire manufacturing process is an important factor in preventing eye loss. For this reason, efforts are currently being made to reduce the incidence of defective products by controlling moisture content as strictly as possible in each process, but this has not been sufficiently effective.

Problems to be Solved by the Invention As a result of various studies on the above-mentioned problem of poor appearance caused by moisture, the present inventors have found that by imparting moisture resistance to thermosetting synthetic resin laminates, conventional adhesives can be used. The present invention has been completed based on the discovery that it is possible to completely prevent the occurrence of defective phenomena such as thinning of the decorative board surface without changing the surface decoration technology or the like.

Means to Solve the Problem The moisture-proof laminate of the present invention has a water vapor permeability of 50 g/m2.
A synthetic resin film of 24 hours or less was interposed in the intermediate layer. A laminate of impregnated sheets impregnated with a thermosetting synthetic resin liquid is obtained by heating and pressure molding by conventional means.

That is, the present invention has a water vapor permeability of 50 g/m'' as defined by the method of A8TM E96-66.

A synthetic resin film of 24 hours or less is interposed between any layers in the laminate of thermosetting synthetic resin-impregnated paper, using a conventional method, for example, 70 kl/cIn2.150°C.

Pressure and heat molding are performed under conditions of 60 minutes.

The synthetic resin film used in the present invention is (a)
It has good adhesion to the thermosetting synthetic resin in the impregnated sheet during pressurization and heating, and (b) does not cause deterioration or thermal shrinkage at the curing temperature of the thermosetting synthetic resin, and has excellent moisture resistance. Water vapor permeation groove dust is 50,!i'/m"・24
It is necessary that it is below Hr. Typical films include aliphatic polyamide film, aromatic polyamide film, polyethylene terephthalate film that has undergone known surface treatment to improve adhesion, polyvinyl chloride film, vinylidene chloride film, and nylidene chloride/acrylonitrile copolymer. There are films, heat-resistant polybutadiene films, vinylon films, etc., and laminate films of these, but any film that satisfies the three conditions (a), (b), and (-→) may be used. It is not limited to.

The reason why the water vapor permeability of a synthetic resin film is defined as 509/m"・24 Hr or less as a measure of moisture resistance is because the water vapor permeability of a thermosetting synthetic resin laminate converted to a thickness of 20μ is approximately 200~ 300j?/m2・24 Hr
Yes, the water vapor permeability of any intermediate layer of this laminate is 50.
f! /m2・24Hr or less, preferably 30 g/m
This is because the presence of a synthetic resin film of 24 Hr imparts the desired moisture resistance to the laminate, making it possible to obtain a decorative Beau V with excellent surface appearance performance without causing any fading.

The water vapor transmission rate is influenced by both the physical properties associated with the composition of the polymeric substance constituting the synthetic resin film and the thickness of the synthetic resin film. Therefore, it is possible to reduce the thickness of a synthetic resin film made of components with low water vapor permeability.

Function In the present invention, the effect that the synthetic resin film with low water vapor permeability is interposed in the intermediate layer of the laminate is that it is effective for particle boards, etc. in the surface decoration process of decorative boards using the laminate as a base material for painting. This prevents water vapor generated from the backing material and adhesive from penetrating the surface of the decorative board 2.

Effects of the Invention According to the present invention, any intermediate layer of a laminate of thermosetting synthetic resin impregnated sheets has a water vapor permeability of 501! /rrL2・24
By interposing the synthetic resin film having a temperature of less than Hr, permeation of water vapor to the surface of the makeup bow 2 can be extremely effectively prevented. As a result, defects such as spot-like smoothness defects and spot-pattern pinholes do not occur on the resin surface such as colored polyester resin on the surface of the makeup bow V, so it is possible to completely prevent appearance defects such as eye thinning. Furthermore, there is no possibility of peeling of the laminates, which is a great advantage for the operation of the decorative board manufacturing industry.Examples Examples of the present invention are shown below, but the present invention is not limited to these. It's not something you can do.

Example 1 Melamine resin-impregnated paper (M), phenolic resin-impregnated paper ( P) and polyester:Datsuzo 1:1 mixed resin-impregnated paper (D) were each prepared according to conventional methods. An aliphatic polyamide Y film with a thickness of 20μ (water vapor permeability 10-129/m2・24Hr) [manufactured by Unitika ■, product name Emblem': l] is placed between two sheets of thermosetting synthetic resin-impregnated paper.
(70kg/cIn2,130-15
0℃.

A laminate was obtained by heating and pressure molding for 60 minutes. The obtained performance is shown in Table 1. Note that the comparative example is an example in which no intermediate film layer is present.

The first surface water vapor permeability is low because the thickness of the laminate is 400 μm. To prevent makeup from causing unsightly eyes, the water vapor permeability of the laminate should be 10 Fl/m2・24
It needs to be less than Hr.

Example 2 The effect of film thickness on the water vapor permeability of a laminate using phenolic resin-impregnated paper was investigated by changing only the thickness of the aliphatic polyamide V film and keeping the other conditions exactly the same as in Example 1. investigated.

The results are shown in Table 2.

Table 2 Example 3 Commercially available thickness 20μ (water vapor permeability 20-22, !i'/
A phenolic resin laminate was obtained by using a polyvinyl chloride film (m2·24 Hr) and using the other conditions exactly as in Example 1. Water vapor permeability is 9.0.9/m
It took 2.24 hours. Adhesion was also examined, but no peeling occurred and good adhesion was obtained.

In each of the above examples, the water vapor permeability is ASTME96
-66, and the adhesion was determined by boiling the test piece for 2 hours, forcibly peeling off the layers with a knife blade, and checking for the occurrence of peeling.

Application Examples Melamine resin moisture-proof laminates and phenolic resin moisture-proof laminates were manufactured using the 40μ thick aliphatic polyamide V film described in Example 2 and under the same conditions as in Example 1. did.

The obtained moisture-proof laminates were laminated to a particle board or plywood having a thickness of 12 mm using a urea adhesive to obtain 620 panels (80 panels in total). Each panel is painted with colored polyester resin.

Claims (1)

[Claims] A laminate of impregnated sheets impregnated with a thermosetting synthetic resin liquid, with a synthetic resin film having a water vapor permeability of 50 g/m^2.24 Hr or less interposed in the intermediate layer, is formed by heating and pressure. A moisture-proof laminate featuring: