JPH02252553A - Decorative veneer plastic composite material and method for molding the same - Google Patents

Abstract

PURPOSE:To require no complicated coating application process and to obtain a decorative composite material of high quality by using a base material, decorative veneer, and a resin sheet material impregnated with resins capable of being mutually set thermally by crosslinking reaction to integrally cure all of them by a hot press and mounting the thermally set layer of the fiber sheet material as a transparent resin surface coating layer. CONSTITUTION:A decorative veneer plastic composite material is formed by integrally curing a base material 11 formed by impregnating a reinforcing fiber material with a thermosetting resin, a thin plate 12 composed of natural precious wood impregnated with a thermosetting resin and the fiber sheet material 13 impregnated with a thermosetting resin for a transparent resin surface coating layer applied to said thin plate 12 by a hot press. All of the impregnated members are strongly bonded by crosslinking reaction to show high strength. The resin impregnated fiber sheet material 13 is used as the transparent resin surface coating layer to strongly protect the decorative veneer (thin plate) 12 and has high durability along with high strength. The reinforcing fiber material used in the base material is org. and inorg. high strength fibers and, among them, a mat of glass wool being relatively short fiber is pref.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a decorative panel having a transparent resin surface coating layer used for, for example, interior parts of automobiles such as center clusters, console upper panels, door trim ornament panels, etc. Regarding plastic composite materials and their molding methods,
In particular, it includes a decorative veneer plastic composite material with a transparent resin coating layer that shows the grain of natural precious wood used in luxury vehicles.

[Conventional technology]

As shown in Figure 3, the high-grade decorative composite material, which has a natural wood decorative veneer and a surface coating layer of transparent resin for automobile interiors, uses beech, shina, shade, lauan, etc. plywood as the base material 4, and has a wood grain pattern on it. Beautiful natural wood such as teak, bird's eye maple, walnut, and scrap wood is sliced into 0.2-1.5 ca. After heat-pressing and bonding together using a resin-impregnated adhesive film 5, the inner and outer peripheries are trimmed and then finished by painting a transparent resin coating 6 with a spray gun 7. There is.

Due to the recent improvement in the general economic level, natural materials are being reconsidered, and in the automobile market, transparent resin coating is applied to natural wood decorative veneers, giving the painted surface a high gloss like a high-end piano or a mirror. Products that are smooth and have a deep feel are being put into practical use mainly for internal parts of luxury cars.

However, the transparent resin coating requires preparation before painting: sanding the decorative board to smooth it and remove dirt, and spraying polyester or urethane coloring paint to prevent discoloration and uniformity of appearance color. After multiple undercoating and re-sanding using Air Screw No. 7 and re-sanding, the finishing process is done with polyester or urethane-based paint to give a feeling of fleshiness, depth, and transparency and to prevent discoloration. Intermediate coating and top coating with transparent paint,
Finally, sanding and polishing with compound wax are required. In addition, these coatings are generally applied using air spray coating methods, but the coating efficiency of the coating is low, resulting in large losses, and it is difficult to finish a smooth and uniform coating film, causing boils, sagging, and sagging on the painted surface. Color unevenness,
It is prone to surface defects such as whitening and orange beers, so it was finished with careful consideration by skilled painting technicians and with sufficient time and strict work management.

Furthermore, decorative veneer plastic composite materials used as interior materials for automobiles are strongly exposed to external effects such as temperature, humidity, and sunlight, so base materials made from natural plywood are prone to expansion and contraction. Due to the effects of microbubbles and moisture contained in the decorative veneer that is glued on top, as well as differences in wood grain density, the transparent resin coating expands and contracts, creating minute irregularities on the painted surface and impairing its smoothness and gloss. However, in the long run, cracks, peeling,
This may cause warping or deformation.

[Problem to be solved by the invention]

As mentioned above, in the production of decorative veneer plastic composites, when conventional techniques are used, especially transparent resin coatings
! The painting process using i6's spray gun 7 requires highly skilled technology, multiple steps, painting equipment, and a lot of time, resulting in low production efficiency, a large impact on manufacturing costs, and a lack of long-term durability. Therefore, there was a strong desire for improvement.

Furthermore, since the decorative veneer is made of natural wood and the base material is plywood, air and moisture (
(included in adhesive) is easy to collect, +1! When the film dries, it can cause problems such as cloudy spots and boiling that occur within the paint film or at the interface between the paint film and the decorative veneer, and minute irregularities, cracks, and peeling that occur under environmental conditions with significant changes in temperature and humidity, as well as color unevenness. , orange beer, sagging, sanding, fading, and other paint defects, loss of paint during spray painting, and prevention of equipment and environmental pollution due to paint spray dust and volatilization of organic solvents. This has become an issue in Japan.

Decorative veneers include teak, rosewood (board grain and straight grain),
Thin boards such as bird's eye maple (heated) and walnut (board grain, straight grain, and heather) are used by bonding to the base material of beech, sinew, and shade plywood, but they have low tensile strength and are difficult to elongate. It has the disadvantage that it can only be molded into flat or simple curved shapes even in general furniture because it is easy to break during molding.

The present invention was made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a high-quality decorative composite material that does not require the conventional complicated painting process, and a method for molding the same.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present inventors created a decorative composite by using a separately formed resin sheet and heat-press hardening it, instead of the conventional painting process. Various studies have been conducted with a focus on forming a transparent resin surface coating layer for materials, but the research has focused on forming a transparent resin surface coating layer on materials. A decorative veneer of natural wood impregnated with resin and a fiber sheet material impregnated with thermosetting resin are stacked one on top of the other, placed in a mold with a mirror-polished inner surface, and heat-pressed in one shot to harden them into one piece. A decorative veneer plastic composite material with a beautiful glossy surface and a high-strength, highly durable transparent resin surface coating layer is suitable for complex painting processes even for three-dimensionally curved surfaces. The present invention has been achieved based on the discovery that it can be manufactured economically with a small number of work steps and under favorable work conditions without the need for such a process.

The decorative veneer plastic composite material of the present invention includes a base material made of reinforcing fiber material impregnated with a thermosetting resin, a thin board of natural precious wood impregnated with the thermosetting resin, and a thin board of natural wood impregnated with the thermosetting resin, which is covered with a thermosetting resin. The above-mentioned thermosetting resins are made of a material that can be cross-linked with each other and thermosetted as one body, and the above-mentioned resin-impregnated fibers are cured and molded into one piece by heat pressing from a fiber sheet material made of fibers. The thermoset layer of the sheet material is provided as a transparent resin surface coating layer and is degassed under reduced pressure.

In an advantageous embodiment of the cosmetic composite according to the invention,
As a base material, a low-shrinkage sheet-like compound is used, in which a reinforcing material made of inorganic or organic fibers is impregnated with a resin liquid containing a thermosetting resin and a low-shrinkage agent.

The method for forming a decorative veneer plus deck composite material according to the present invention includes a base material made of a reinforcing material made of inorganic or organic fibers impregnated with a thermosetting resin, a decorative veneer of natural precious wood impregnated with a thermosetting resin, Fiber sheet materials impregnated with thermosetting resin are stacked one on top of the other, set in a mold having a mirror-polished inner surface, and heat-pressed in one shot to be cured as one piece. Forming a transparent resin surface coating layer by curing, and using thermosetting resins for the base material, decorative veneer, and fiber sheet material that can be crosslinked and thermoset as one body under reduced pressure. Degas.

In another embodiment of the above molding method, a sheet-like reinforced fiber material as a base material is impregnated with a resin mixture containing a thermosetting resin and a low shrinkage agent, and aged over time to a tag-free state. A low shrinkage sheet molding compound preform is used.

In another embodiment of the above-mentioned molding method, a fibrous reinforcing sheet is used as the decorative veneer on the back side of a grained or straight-grained thin board of natural wood.

In yet another embodiment of the above molding method, when hot pressing the laminate in the mold, the inside of the mold is degassed under reduced pressure after clamping and prior to pressurization.

[Effect]

The decorative veneer plastic composite material according to the present invention comprises a base material made of reinforcing fiber material impregnated with a thermosetting resin, a thin board of natural precious wood impregnated with the thermosetting resin, and a transparent resin surface coating layer covered thereon. The product is made of fiber sheet material impregnated with a thermosetting resin and hardened into one piece by heat pressing, and the entire product is strongly bonded through a crosslinking reaction, giving it a higher strength than conventional products. Furthermore, since the resin-impregnated fiber sheet material is used as a transparent resin surface coating layer, the decorative veneer is strongly protected and exhibits high strength and durability.

The reinforcing fiber material used for the base material may be organic or inorganic high-strength fibers, but glass wool mats, which are relatively short fibers, are particularly preferred.

As the thermosetting resin of the base material, 14 or more unsaturated polyester 2 diallyl phthalate resins or alkyd resins are used. In addition to these thermoset prepolymers, thermoplastic resins as low-shrinkage agents (polyethylene, polyester, styrene-butadiene copolymers, polymethyl methacrylate, etc.), as well as other customary materials, such as fillers, crosslinkers, etc. The above-mentioned reinforcing fiber material is impregnated with a mixture of additives, thickeners, mold release agents, catalyst 5 colorants, polymerization stabilizers, solvents, etc., and aged to a tag-free state over time. It is preferable to use a preform of a low-shrinkage sheet molding compound (hereinafter abbreviated as SMC) obtained by. As a result, the resulting decorative veneer plastic composite material has high rigidity, high strength, thin wall thickness, high heat resistance,
In addition to being highly water resistant, it also has moderate flexibility, and with high dimensional stability, it can be inserted into reinforcing ribs or bosses for screw fittings and retainer driving fittings for parts mounting. Since planar as well as non-planar decorative materials can be made by the hot press molding method according to the present invention, the degree of freedom in design is improved and the cost of parts installation can be significantly reduced.

The sheet material for the transparent resin surface coating layer (hereinafter referred to as the resin sheet material) is a relatively thin sheet made of a fibrous sheet impregnated with a thermosetting resin, and when it is later hot pressed in a mold, the underlying layer It is heat-cured to give it a transparency that allows the wood grain of the decorative veneer to be clearly revealed.

As the thermosetting resin used for this resin material, diallyl phthalate resin, unsaturated polyester resin, and alkyd resin can be used in the same way as the thermosetting resin for the base material, and prepolymers of these resins can be used. Each of them alone or as a mixture is impregnated into the fibrous sheet I.

As a fibrous sheet of this resin sheet material, it has strong toughness and
Valve paper, or polyester fiber, acrylic fiber or nylon fiber, whose physical and chemical properties are also stable;
Preferably, a non-woven fabric made of synthetic fibers such as polyvinyl alcohol fibers is used.

Such a resin sheet material includes the resin prepolymer described above together with a solvent, a polymerization catalyst, an internal fi type agent, a polymerization stabilizer, etc., and if necessary, other resin amount adjusters for modification and inorganic The mixture is mixed with the addition of a filler, impregnated into paper or synthetic Sa fiber nonwoven fabric with a basis weight of 20-4.0 g/i, and dried to form a resin with a resin content of +00-250 g/i''. It is preferable to use a sheet material with a diameter of 0.3-0.5 inches.One or several sheets of this sheet material are placed on top of a decorative veneer, laminated together with the base material, and then molded with a polished inner surface. When hot-pressed in a wafer, a crosslinking reaction of the resin occurs within each layer and between each layer, achieving high interlayer adhesion and a beautiful glossy surface. Furthermore, by adding a matting agent such as an inorganic pigment to the impregnated resin liquid or adjusting the number of laminated resin sheet materials, it is possible to obtain a gloss from high gloss to matte. In the present specification, the expression "impregnated with a thermosetting resin" means impregnated with an impregnating resin solution mixed with the above-mentioned prepolymers and monomers.

Decorative veneers can be applied directly to the grain, straight-grain, or heathered thin boards of natural wood such as oak, rosewood, walnut, scrap, and bird's eye maple, or after toning treatment by dyeing or painting, using the resin sheet materials and substrates mentioned above. A resin capable of crosslinking with the thermosetting resin of the material, preferably also impregnated with a prepolymer of one or more of diallyl phthalate resins, unsaturated polyester resins, and alkyd resins, is used.

If you use a fibrous sheet such as washi paper or other synthetic Ia fiber non-woven fabric as a reinforcing backing material for the decorative veneer and line it with heat-resistant SBR adhesive, etc., the decorative veneer will not crack during molding. This can be prevented and a good product can be obtained. As this fibrous sheet, use valve paper, which has strong toughness and stable physical and chemical properties, or a nonwoven fabric made of synthetic fibers such as polyester fiber, acrylic #A fiber, or nylon fiber W5 polyvinyl alcohol fiber. is preferable.

The thermosetting resin prepolymer impregnated into the decorative veneer causes a crosslinking reaction between the resin sheet material and the base material resin or prepolymer during heat pressing to increase the interlayer adhesion strength. At the initial stage of molding heating, that is, at the early stage of reaction, it shows softening and flexibility, so it is extremely effective in preventing cracking during molding. In addition, in this resin impregnation process, microbubbles and moisture adsorbed in the back cracks of decorative veneers and minute gaps such as essential fiber conduits are dried in advance and removed by filling with resin liquid, so the temperature Even in a usage environment where there are repeated changes in temperature and humidity, minute irregularities (eye discoloration), whitening, peeling, cracks, etc. may occur on the surface of the transparent resin surface coating layer due to the difference in expansion and contraction of the transparent resin layer and decorative veneer. Prevented.

The method for producing a decorative veneer plastic composite material according to the present invention is characterized in that various chemical reaction effects and physical effects between layers work synergistically. In particular, even if no adhesive is applied between the resin sheet and the decorative veneer or base material layer, the resins impregnated in each layer will cause a crosslinking reaction with each other and thermoset, so the whole will be firmly bonded as a whole. This product greatly streamlines the adhesive and paint coating process, and achieves high functionality not found in conventional products, that is, a high-grade surface appearance and a significant increase in product strength and rigidity. Various molded products having dimensional curved surface shapes can also be produced in one shot.

When a preform of a sheet-like molding compound with low shrinkage is used as a base material, high mold-embedding stability and strength can be obtained even with a relatively thin wall, and the resulting product also has high dimensional stability.

Before hot-pressing the laminate in the mold, once the pressure inside the mold is reduced, the inside of the resin sheet material for the surface coating layer, the back reinforcement material of the decorative veneer, and the fibers used as reinforcement for the base material are removed. As the microbubbles (air) remaining in the voids of the resin sheet and the decorative veneer are degassed, the impregnation of the resin into the decorative veneer becomes more even, and defects such as cloudy spots and air bubbles that occur in the resin sheet and the decorative veneer are eliminated. The effect of prevention will be even greater.

The decorative veneer plastic composite material according to the present invention has good surface gloss, smoothness, moldability, high strength, high rigidity, high water resistance, etc., all of which are achieved by the thermosetting resin prepolymer of the resin sheet material according to the present invention. and the thermosetting resin impregnated into the fibrous sheet material of the base material and the thermosetting resin in the resin-impregnated decorative veneer, and the low shrinkage taI of the base material.
This is achieved as a result of the I-reinforced resin impregnated material having high strength, high rigidity, high heat resistance, high moisture resistance, etc.

〔Example〕

Hereinafter, the present invention will be described in detail based on Examples and Comparative Examples with reference to the accompanying drawings.

The base material was cut in advance so that the charge rate was 90%, and the resin-impregnated decorative material thin plate and the resin-impregnated sheet H for the transparent glossy surface coating layer were 95% of the projected area of the Koi-Yu flat plate mold. .

The base material is a glass roving chopped strand mat (approximately 1/4-2" in length) and an unsaturated polyester resin containing a low-shrinkage agent made of thermoplastic polymer in 5 layers of thermosetting resin. A low-shrinkage sheet-like SMC obtained by impregnating the mixture and aging it to a tag-free state (Nistermat AU-12 manufactured by Mitsui Toatsu Chemical Co., Ltd.)
0) was used.

As the decorative veneer, a single heathered bird's eye maple veneer with a thickness of 0.3 mm was used, and on the back side of the veneer, Japanese paper was bonded and strengthened with a styrene-butadiene rubber adhesive. This decorative veneer was coated with unsaturated polyester (Orestar RP-10331 manufactured by Mitsui Toatsu Chemical Co., Ltd., 100 parts by weight, 0.7 parts by weight of tert-butyl perbenzoate as a catalyst, and 0.2 parts by weight of methylhydroquinone as a polymerization stabilizer) using a vacuum/pressure method. A resin-impregnated decorative veneer was used, which had been impregnated with 50 parts of a mixed solution consisting of 50 parts.

The resin-impregnated sheet material was made of valve paper with a basis weight of 25 g/+", commercially available diallyl phthalate prepolymer (Dap A, manufactured by Hitosaka Soda Co., Ltd.), 40 parts, and unsaturated polyester resin (5P = l, manufactured by Fuji Kobunshi Co., Ltd.). 60 parts by weight and 5 parts by weight of tert-butyl peroxide as a catalyst, and effective amounts of a polymerization stabilizer, an inorganic filler, an internal mold release agent, and a solvent were impregnated and dried. Four sheets of this material, each having a resin content of 108 g/m'', were used in stacks.

As shown in FIG. 1, a base material H1 resin-impregnated decorative veneer 12,
The resin-impregnated sheet materials 13 were stacked one on top of the other in this order starting from the bottom layer, and then set in a laminated manner in a non-planar mold. This mold is
As shown in Figure 2, the width is 250 m + w at the center of the top surface.
, a depth of 250 mra, a height of 5.01, and an inclination angle of 45° and 78° for the side rising portion, respectively, and the corners are both rounded off with a curvature of R = 1.5s + mφ: Protrusion 21'+: equipped. Width 460 l1lIIX Depth 350 r*va X Thickness 2.5mm (7) Molded product 2
A material with a mirror-finished inner surface was used so that a value of 0 was obtained. The mold temperature was set to 145℃ for the upper mold and 140℃ for the lower mold, and the inside of the mold was set at 60 mrm II g before mold clamping.
Depressurize and degas, mold clamping speed 2 tars/sec
, and hot pressed for 10 minutes at a pressure of 100 kgf/cm'. After demolding, the molded product has cracks in the thin decorative material, peeling,
Although no blisters, bubbles, cloudiness, or warping were observed, this was further cooled at room temperature for 24 hours, and the surface was coated with #800-'t.
After lightly sanding with ono waterproof sandpaper, apply finishing liquid compound (FMC-1 manufactured by Ishihara Pharmaceutical Co., Ltd.).
Polished in step 1).

While maintaining the beauty of Bird's Eye Maple, which is a precious natural wood, it has superior appearance quality and heat resistance, such as gloss, depth, transparency, and smoothness, and is superior to conventional products, as shown in the attached table. A molded article having an acute three-dimensional surface that could not be obtained with a conventional molded article was obtained.

Erosion-1 Unsaturated polyester resin and reaction aids were applied under the same impregnation conditions as Example 1 to a straight-grained teak wood veneer with a thickness of 0.3 mm, which had Japanese paper on the back side reinforced with SBR adhesive as in Example 1. Then, this resin-impregnated sheet material was used together with the same unsaturated polyester SMC base material containing a low shrinkage agent as used in Example 1 and the resin-impregnated sheet material in Example 1! They were cut according to the charge ratio according to the following, overlapped, and then set in a non-planar mold.

Resin-impregnated sheet material is diallylphthale] prepolymer (Dap A manufactured by Osaka Soda Co., Ltd.) 60 parts, unsaturated polyester (Nystar D-400 manufactured by Mitsui Toatsu Chemical Co., Ltd.)
40 parts by weight, benzoyl peroxide 3 as catalyst
A mixed solution containing an effective amount of internal mold release 71f11!111: and a polymerization stabilizer in an organic solvent has a basis weight i.
t 23 g/impregnated and dried polyvinyl alcohol fiber nonwoven fabric (Kuraton manufactured by Kuraray Co., Ltd.) m @ amount 1
It was 10g and 7m'', and was used by stacking 4 pieces of kneading.

The same mold as in Example 1 was used for heat pressing, and the above resin-impregnated sheet 13, fat-impregnated decorative veneer 12,
and base material (1) were heat pressed together, and the surface finishing after demolding was also applied in the same manner.

There are no cracks, peeling, blisters, air bubbles, cloudiness, or warping in the molded product, and while maintaining the beauty of the straight grain of teak, which is a precious natural wood, it is equivalent to or better than conventional products as shown in the attached table. A molded product with excellent appearance qualities such as gloss, depth, transparency, and smoothness, as well as excellent moisture resistance, and an acute three-dimensional surface that cannot be obtained with conventional products. Obtained.

Example - Once a thin natural walnut board with a board thickness of 0.3 ffim was bonded and strengthened on the back side in the same manner as in Example 1, the previous two
It was impregnated with unsaturated polyester filtrate and reaction aids under the same impregnation conditions as in the example and used as a decorative veneer. This decorative veneer was cut to the same charge ratio as in the previous two cases, together with a base material made of the same low-shrinkage unsaturated polyester SMC as in the previous two cases, and a resin-impregnated sheet material. Laminated and set in a mold.

As the resin-impregnated sheet material for the coating layer, a mixed solution of a resin prepolymer and reaction aids having the exact same formulation as in Example 2 was used, and a nonwoven fabric of acrylic fibers with a basis weight of 38 g/m (OL made by Nippon Vilene Co., Ltd.) was used. -7371) and dried, three sheets of resin @ 230 g/m'' were used in layers.

The resin-impregnated sheet 13, the resin-impregnated decorative veneer 12, and the base material 11 were heat-pressed together using the same mold and molding conditions as in the previous two examples, and the surface finish polishing after demolding was also carried out in the same manner. provided.

The resulting molded product has no surface defects, maintains the beauty and luxury of the grain of walnut, a precious natural wood, and has superior appearance quality that is equal to or better than conventional products as shown in the attached table. , which had excellent moisture resistance and an acute three-dimensional surface that could not be obtained with conventional products.

A certain person Quality of surface of heat press molded product (Note) Shows the second eye.

Shows surface whitening.

Indicates thin plate peeling.

Items with no abnormal appearance.

Items with a slight abnormality in appearance.

Something that has an abnormal appearance.

Items with significant abnormalities in appearance.

Test method (1) Visibility Glossiness was measured using a PGD II type tester manufactured by Nippon Color Research.

(2) Specular gloss was measured using S&+14 color computer MoDel-4 manufactured by Suga Test Instruments.

(3) Smoothness is a visual comparison evaluation with a reference plate.

However, the reference plate is used as a standard for visual sensory evaluation in five stages, and consists of five stages 1 to 5 below.

5 had no orange beer and was completely flat (the fluorescent lights looked straight on).

4 shows very little orange beer.

3 has a slightly noticeable orange beer.

2 stands out as orange beer.

Orange beer stands out very much (the fluorescent lights look extremely jagged).

(4) Moisture resistance: JIS Z 0228 &:”
, Yo ivy.

A humidity tester manufactured by Suga Test Instruments Co., Ltd. was used at a temperature of 50±1''C1 and a humidity of 95% or higher.

All comparative products were manufactured using conventional techniques.

〔Effect of the invention〕

The decorative veneer plastic composite material according to claim 1 of the present invention uses a base material, a decorative veneer, and a resin sheet material each impregnated with a resin that can be thermosetted by a crosslinking reaction, so that the whole is firmly bonded together. It has high strength and provides a highly durable and luxurious finish. In addition, in manufacturing the same, as the transparent resin surface coating layer, a resin sheet material obtained by impregnating a fiber sheet with a thermosetting resin is heat-pressed in a mold with a mirror-finished inner surface, and then hardened. Since a molded product is used, the numerous painting steps required in conventional manufacturing methods, as well as the equipment, work time, and skilled techniques involved, are greatly reduced, improving work efficiency.
Not only does it contribute to a significant reduction in manufacturing costs, but it also provides a finished surface with a more luxurious appearance. Furthermore, good formability, which could not be obtained with conventional manufacturing methods, makes it possible to form products with three-dimensional curved shapes, as well as ribs for reinforcing strength and rigidity, screw fittings for attaching parts, etc. Since the boss etc. for inserting the retainer driving fitting can be embedded in the base material, the degree of freedom in design is greatly improved, and the cost of installing parts can also be significantly reduced.

When a sheet-like compound impregnated with a thermosetting resin containing a low shrinkage material is used as a base material according to claim 2, high rigidity, high strength, good moldability, and high dimensional stability are imparted to this composite material. Its added value is further enhanced by its highly functional features such as durability, heat resistance, and water resistance.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure and lamination of a decorative veneer composite according to an embodiment of the present invention, FIG. 2 is a perspective view showing a molded product according to the same embodiment, and FIG. 3 is a decorative veneer composite according to the prior art. FIG. 2 is a cross-sectional view showing the structure of a plate composite material and its molding method. 2.12, ... Decorative veneer 4,! 1. Base material 5... Adhesive layer 6.
13. Transparent resin surface coating layer 7 Spray gun agent Patent attorney Masaharu Fukutome Figure 3

Claims (6)

[Claims] (1) In a decorative veneer plastic composite material consisting of a base material, a decorative veneer placed over the base material, and a transparent resin surface coating layer, the base material is made of reinforcing fiber material impregnated with a thermosetting resin, It is integrally cured and molded by heat pressing from a thin plate of natural wood impregnated with a curable resin and a fiber sheet material impregnated with a thermosetting resin covered thereon. A decorative veneer, characterized in that it is made of materials that can be cross-linked with each other and heat-cured together, and that it is provided with a thermo-cured layer of the resin-impregnated fiber sheet material as a transparent resin surface coating layer. plastic composite. (2) A sheet-like compound made of fiber-reinforced plastic impregnated with a reinforcing material made of inorganic or organic fibers with a resin liquid containing a thermosetting resin and a low shrinkage agent is used as the base material. Decorative veneer plastic composite. (3) In manufacturing the decorative veneer plastic composite material according to claim 1, which comprises a base material, a decorative veneer covered thereon, and a transparent resin surface coating layer, the composite material is made of inorganic or organic fibers. A base material made of a sheet-like compound made of reinforcing material impregnated with a thermosetting resin, a decorative veneer of natural precious wood impregnated with a thermosetting resin, and a fiber sheet material impregnated with a thermosetting resin are layered in order. Set in a mold having a mirror-polished inner surface, heat press in one shot and cure as one piece, and at that time, form a transparent resin surface coating layer by heat curing the resin-impregnated fiber sheet, and A method for molding a decorative veneer plastic composite material, characterized in that the base material, the decorative veneer, and the fiber sheet material each use thermosetting resins that can undergo a crosslinking reaction with each other and thermoset as one body. (4) As a base material, a sheet-like reinforced fiber material is impregnated with a resin mixture containing a thermosetting resin and a low-shrinkage agent, and then aged to a tag-free state over time. 4. A molding method according to claim 3, wherein a sheet molding compound preform is used. (5) The molding method according to claim 3, wherein a fibrous reinforcing sheet is bonded in advance to the back surface of the decorative veneer. (6) The molding method according to claim 3, wherein during hot pressing, the inside of the mold is degassed under reduced pressure after clamping and prior to pressurization.