JP2573897C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vinyl chloride resin film for vacuum press molding for decorative boards. [0002] Decorative boards are widely used in various products such as building materials, furniture, cabinets of household electric appliances and the like. Conventionally, resin films are laminated on plywood, MDF, steel plate, inorganic plate and the like. It is manufactured. However, in recent years, in particular, decorative boards formed by laminating a vinyl chloride resin film on a substrate having a three-dimensional curved surface by vacuum press molding have come to be widely used. As described above, an adhesive is applied to a base material having a three-dimensional curved surface, and the base material is bonded to the base material by using a vacuum press (hereinafter, referred to as vacuum press molding) to form a decorative plate. The vinyl chloride resin film used for manufacturing usually stretches well at a vacuum press molding temperature (usually 60 to 80 ° C.), and conforms well to a three-dimensional three-dimensional curved surface. It is required as a characteristic that the stretched portion of the film does not shrink after being bonded to the material. The smaller the amount of the plasticizer in the film, the smaller the above-mentioned shrinkage of the film. However, on the other hand, the elongation at the time of vacuum press molding is deteriorated, and the printability, that is, the wetting index, the squeeze transfer property, etc. are also deteriorated. For example, it is generally said that the wetting index is preferably in the range of 33 to 36 dyn / cm. When the squeezing transferability is poor, for example, in the case of matting, the effect of matting squeezing is obtained. On the other hand, in the case of gloss, problems such as lack of gloss occur. SUMMARY OF THE INVENTION [0004] The present invention has been made to solve the problems in the conventional vinyl chloride resin film for decorative boards used in vacuum press molding. In addition to conforming to a three-dimensional curved surface, the stretched portion of the film does not shrink after being bonded to the base material by vacuum press molding. It is an object of the present invention to provide an excellent vinyl chloride resin film for vacuum press molding for decorative boards. [0005] A vinyl chloride resin film for vacuum press molding for decorative boards according to the present invention is obtained by applying an adhesive to a substrate and bonding the substrate to the substrate by a vacuum press. A vinyl chloride resin film for vacuum press molding for decorative boards for producing decorative boards, wherein 100 parts by weight of a vinyl chloride polymer are: (a) 8 to 20 parts by weight of a plasticizer; and (b) methacrylic acid. It is characterized by containing 3 to 30 parts by weight of a methyl methacrylate copolymer selected from methyl acrylate-alkyl acrylate copolymer and methyl methacrylate-maleimide copolymer. The vinyl chloride resin film for vacuum press molding for decorative boards according to the present invention contains a plasticizer in a range of 8 to 20 parts by weight based on 100 parts by weight of a vinyl chloride polymer. When the amount of the plasticizer exceeds 20 parts by weight with respect to 100 parts by weight of the vinyl chloride polymer, the film stretched and adhered to the substrate by vacuum press molding shrinks, and the substrate peels off. , The product value may be significantly impaired. In particular, in the present invention, the amount of the plasticizer is preferably in the range of 8 to 12 parts by weight based on 100 parts by weight of the vinyl chloride polymer. Further, the vinyl chloride resin film for vacuum press molding according to the present invention is selected from methyl methacrylate-alkyl acrylate copolymer and methyl methacrylate-maleimide copolymer with respect to 100 parts by weight of the vinyl chloride polymer. From 3 to 30 parts by weight of a methyl methacrylate copolymer. Such a methyl methacrylate copolymer has a higher bitat softening temperature, heat deformation temperature, and softening temperature than the vinyl chloride resin used, and has compatibility with the vinyl chloride resin, and thus has an effect on the film temperature. sensitive to suppress, inhibit shrinkage of the film in the bonded Ri together portions extending to the base material by a vacuum press molding. Moreover, such a methyl methacrylate copolymer, even when blended with a vinyl chloride resin film, has reduced film elongation, wettability index, draw transferability, etc. during vacuum press molding, compared to a film not blended. They are almost the same. The present invention will be described below with reference to examples, but the present invention is not limited to these examples. 100 parts by weight of polyvinyl chloride having an average degree of polymerization of 850 were mixed with a plasticizer, dioctyl phthalate and methyl methacrylate copolymer, in the amounts shown in Tables 1 and 2 to form a film by calendering. The grain was embossed. In Tables 1 and 2, Comparative Examples 1 and 2 and Examples 1 to 6 used a methyl methacrylate copolymer as a methyl methacrylate-alkyl acrylate copolymer (H-602 manufactured by Mitsubishi Rayon Co., Ltd.), and In Example 7 , a methyl methacrylate-maleimide copolymer (H-630 manufactured by Mitsubishi Rayon Co., Ltd.) was used. Next, an adhesive (urethane two-liquid made by Konishi Co., Ltd.) is applied to a base material (MDF) composed of a flat plate member having a flat bottom surface, both in a cross section and in a vertical cross section (the R portions at the upper four corners are 10R). (Aqueous mold adhesive CVC45L) was applied thereto, and the above-mentioned film was bonded thereto by vacuum press molding (vacuum press). The vacuum pressing conditions were a pressure of 3.0 kg / cm ² , a temperature of 60 ° C., a time of 150 seconds, and a preheating time of 15 seconds. The evaluation of film and vacuum press formability was performed as follows. Table 1 shows the results
And Table 2. The No. 1 dumbbell based on tensile elongation JIS K-6734 to prepare a test piece, 60 ° C. 及
At 80 ° C. and 80 ° C., the elongation in the machine direction only was measured with a tensile tester. A sample having a creeping width of 25 mm and a marked line of 100 mm was set on a tensile tester at 60 ° C., and allowed to stand for 1 minute. Then, the sample was pulled at a speed of 50 mm / min to 200 mm, the lower chuck was removed, and the sample was released. It was later removed and the shrinkage was measured. This creep property is a substitute test for shrinkage of the film after bonding the film to the base material by a vacuum press. As described above heat shrinkage amount, after attaching the film by a vacuum press to a substrate consisting of a flat plate member of the bottom is a cross-sectional and longitudinal sectional Both semicylindrical, incision along connexion film a diagonal of the substrate Was put in a gear oven at 60 ° C., taken out after 72 hours, and the edge part shrinkage and the corner part shrinkage were measured. As a result of the film shrinking along the substrate, a lower portion of the substrate is exposed. Therefore, the average value of the exposed length of the base material at the center of each side (the shrinkage length of the film from the lower end of the base material) was defined as the edge part shrinkage (mm). Shrinkage of the film along the substrate results in opening between the films at the four corners of the substrate. The average value of the opening of the film at each corner is calculated as the corner shrinkage (m
m). Wetting index A wetting index standard test based on JIS K-6768 was performed. Gross value after embossing The grain embossed of the film rolled by calendering is put in, and then the gloss value of the film is measured according to JIS Z-8741 by a variable angle gloss meter (VG manufactured by Nippon Denshoku Industries Co., Ltd.). -ID type), both the incident angle and the light receiving angle were measured at 60 °. [Table 1] [Table 2] As is clear from the results shown in Tables 1 and 2, by blending a predetermined methyl methacrylate copolymer with a vinyl chloride-based polymer, the wetting index, the gloss value and the elongation are substantially reduced. Without affecting the heat shrinkage and creep properties, and according to the present invention, it is possible to obtain a vinyl chloride resin film for decorative board which can be suitably used for vacuum press molding. it can. As described above, according to the vinyl chloride resin film for vacuum press molding for decorative boards of the present invention, the elongation is large, and therefore, in vacuum press molding, a three-dimensional three-dimensional curved surface is obtained. After being adhered to the base material by vacuum press molding, the stretched portion of the film does not shrink or is suppressed as described above, so that the film is excellent in vacuum press moldability, and further, printability and Excellent squeezing transferability.

Claims (1)

Claims: 1. A vinyl chloride resin for vacuum press molding of a decorative board for producing a decorative board by applying an adhesive to a base material and bonding the adhesive to the base material by a vacuum press. It shall apply in the film, the vinyl chloride polymer 100 parts by weight, (a) 8 to 20 parts by weight of a plasticizer, and (b) methyl methacrylate - maleimide copolymer - alkyl copolymer and methyl methacrylate acrylate A vinyl chloride resin film for vacuum press molding for decorative boards, comprising 3 to 30 parts by weight of a selected methyl methacrylate copolymer.