JPH09239762A - Production of molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a design having a transparent feeling, a depth feeling and a high grade feeling by using a transparent thermosetting molding material as a thermosetting molding material. SOLUTION: A first thermosetting molding material 1 and a second thermosetting molding material 3 are superposed one upon another so that a transparent sheet 2 is interposed between both of them to be molded under heating and pressure. At this time, a transparent thermosetting molding material is used as one of the first and second thermosetting molding materials 1, 3 and a colored thermosetting molding material is used as other one of them. By this constitution, since the transparent thermosetting molding material and the colored thermosetting molding material are not mixed at the part where the transparent sheet 2 is interposed at a time of molding, a molded product excellent in design effect having a depth feeling, a transparent feeling and a high grade feeling can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a molded article capable of exhibiting a design having a high-class feeling.

[0002]

2. Description of the Related Art Historically, in the field of fiber reinforced plastics (hereinafter referred to as FRP), particularly in the production of FRP bathtubs, bath units, etc., there is a molding method called a hand-up molding method or a spray-up molding method. . In these molding methods, it takes a lot of time and man-hours to produce one product. Therefore, as a method of significantly improving these productivity, a sheet molding compound (hereinafter referred to as SMC), Alternatively, a molding material for thermoforming such as bulk molding compound (hereinafter referred to as BMC) has been developed, and a press molding method using the same has been widely used.

However, such SMC or BMC
The molded product obtained by the press molding method of 1. is limited to a single color for the entire molded product.For example, if the molded product is red, only the red molded product can be produced, and the degree of freedom in design is very narrow. It has drawbacks. Of course, if post-processing such as printing or painting is performed, it is possible to appropriately add a design, but in this case, a complicated post-processing step is required, resulting in poor productivity.

Therefore, as a method for decorating these FRP products, for example, as described in JP-A-5-285973, a decorative sheet made of printed titanium paper is used.
A method has been proposed in which a decorative molded product is obtained by laminating and molding on an MC.

[0005]

However, the decorative molded product obtained by such a method has a decorative surface because the decorative sheet is only placed on the surface of the molded product. The product had a low commercial value because it was inferior in feeling and transparency, and could give an image of high quality.
Further, since the decorative sheet is exposed on the surface, there is a problem that the hot water resistance is poor and a defect such as swelling is likely to occur when exposed to hot water.

The present invention has been made by paying attention to the problems of the conventional FRP decorative molded product as described above, and has a transparent feeling, a deep feeling, and a high-class feeling without inhibiting hot water resistance. It is an object of the present invention to provide a method for producing a molded product capable of expressing a design of the product.

[0007]

According to the present invention, a first thermosetting molding material and a second thermosetting molding material are superposed and heated with a transparent sheet interposed therebetween. A method of manufacturing a molded article for pressure molding, comprising a transparent thermosetting molding material as at least one of the first thermosetting molding material and the second thermosetting molding material. It is a manufacturing method.

In the present invention, as the transparent sheet,
Basically, paper, woven fabric, and non-woven fabric without coloring or printing are used. As the paper, various conventionally known ones can be appropriately used, and examples thereof include thin paper, overlay paper, newspaper roll paper, high-quality paper, medium-quality paper, waste paper, gravure paper, art paper, coated paper, and writing. Examples include paper and drawing paper.

As the woven cloth, various conventionally known cloths can be appropriately used. Examples thereof include natural fibers such as silk, hemp and cotton, regenerated fibers such as rayon, synthetic fibers such as polyester fibers, polyamide fibers and acrylic fibers. Examples include woven materials.

As the non-woven fabric, various conventionally known ones can be appropriately used. For example, natural fibers such as silk, hemp and cotton, regenerated fibers such as rayon, synthetic fibers such as polyester fibers, polyamide fibers and acrylic fibers are chemically used. Examples of the cloth-shaped one include a material that is thermally or thermally used by adhesion or fusion of fibers.

A transparent sheet to which a color pigment such as titanium paper is added can be used. In this case, the amount of the color pigment used is 1 for the entire sheet.
It is preferably 0% by weight or less, and more preferably 5% by weight. When the amount of the coloring pigment is too large, the transparency is lowered and the appearance design of the molded product is apt to be lowered.

The thickness of the transparent sheet is 0.02 to 0.2.
mm is preferable, and more preferably 0.05 to
It is 0.15 mm. If it is too thick, the transparency tends to deteriorate, and the appearance design of the molded product tends to deteriorate. On the contrary, if it is too thin, it tends to break during molding.

The transparency of the transparent sheet is, of course, preferably 100% of the light transmittance, but if the colored SMC can be seen in the back of the transparent sheet after molding, the effect of the present invention can be achieved. Any material having a light transmittance of at least 40% can be used, and one having a light transmittance of at least 40% is more preferred.

In the present invention, a transparent curable molding material is used as at least one of the first thermosetting molding material and the second thermosetting molding material. That is, a transparent thermosetting molding material may be used as the first thermosetting molding material, and a coloring thermosetting molding material may be used as the second thermosetting molding material, or the first thermosetting molding material may be used. A transparent thermosetting molding material may be used as both the molding material and the second thermosetting molding material.

The thermosetting molding material for forming the first thermosetting molding material and the second thermosetting molding material is SM
C and BMC are used. Examples of the thermosetting resin component forming the thermosetting molding material include unsaturated polyester resin, epoxy acrylate resin, urethane acrylate resin and the like.

The unsaturated polyester resin is usually produced by a known and conventional method from an organic polyol, an aliphatic unsaturated polycarboxylic acid, and if necessary, an aliphatic saturated carboxylic acid and / or an aromatic polycarboxylic acid. What has been done is used.

Examples of organic polyols include diols, triols, tetrols and mixtures thereof, and they are mainly classified into aliphatic polyols and aromatic polyols.

As the aliphatic polyol, for example, ethylene glycol, propylene glycol, neopentyl glycol, dibromoneopentyl glycol, hexamethylene glycol, trimethylene glycol, trimethylolpropane, pentaerythryl diallyl ether, hydrogenated bisphenol A, etc. Is mentioned. Examples of the aromatic polyol include bisphenol A and bisphenol A.

As the aliphatic unsaturated polycarboxylic acid,
(Anhydrous) maleic acid, fumaric acid, (anhydrous) itaconic acid, etc. may be mentioned. Examples of the saturated aliphatic polycarboxylic acid include sebacic acid, adipic acid, (anhydrous) succinic acid and the like.

As the aromatic polycarboxylic acid, (anhydrous)
Examples thereof include fusaric acid, isophthalic acid, terephthalic acid, methyltetrahydrophthalic anhydride and endomethylenetetrahydrophthalic anhydride.

As the epoxy acrylate resin, a resin produced by a known and commonly used method from an epoxy resin and a monocarboxylic acid having a reactive double bond such as (meth) acrylic acid is usually used.

As the epoxy resin, for example, epichlorohydrin and bisphenol A can be prepared by a known method.
Bisphenol A type epoxy resin produced from, epichlorohydrin and brominated bisphenol A produced brominated bisphenol A type epoxy resin, phenol novolac or orthocresol novolac glycidyl ether produced novolac type epoxy resin, various amines Examples thereof include glycidyl amine type epoxy resins obtained by reacting epichlorohydrin.

As the urethane acrylate resin, an organic polyisocyanate is usually reacted with an organic polyol such as an alkylene diol, an alkylene diol ester, an alkylene diol ether, a polyether polyol or a polyester polyol, and a hydroxyalkyl (meth) acrylate is further reacted. The one manufactured by

Examples of the polyol include alkylene diols such as ethylene glycol, propylene glycol, diethylene glycol, polyethylene glycol, polypropylene glycol and butane diol, and polyether polyols include polyoxymethylene and polyoxymethylene.
Examples of polyester polyols such as polyethylene oxide and polypropylene oxide include condensation compounds of organic polyols such as alkylene diols and polycarboxylic acids.

Examples of the polyisocyanate include tolylene diisocyanate, isophorone diisocyanate, polymethylene polyphenyl diisocyanate and the like.
As the hydroxyalkyl (meth) acrylate, usually, hydroxyethyl (meth) acrylate, hydroxy (meth) acrylate and the like can be mentioned. The hydroxyl group is usually attached to the carbon in the β-position of the alkyl group. Alkyl groups can usually contain up to 8 carbon atoms.

The thermosetting resin component forming the thermosetting molding material contains, in addition to a low-shrinking agent, a copolymerizable monomer, an organic peroxide, various fillers, reinforcing materials, and additives as necessary. A transparent thermosetting molding material can be compounded with a transparent filler and the like to ensure transparency, and a colored thermosetting molding material can be mixed with a coloring pigment or the like. Gives colorability.

As the low-shrinking agent, for example, polyvinyl acetate, polymethyl (meth) acrylate, polyethylene,
Examples thereof include thermoplastic resins such as ethylene-vinyl acetate copolymer, vinyl acetate-styrene copolymer, polybutadiene, saturated polyesters and saturated polyethers.

The blending amount of the thermoplastic resin is preferably 0.1 to 30% by weight of the resin component, and 0.3 to 20.
% Is more preferred. If the blending amount is too large, the viscosity of the molding material becomes high, so that sufficient fluidity cannot be obtained at the time of molding, and conversely, if it is too small, a sufficient low shrinkage effect cannot be obtained.

As the copolymerizable monomer, styrene, α-
Methylstyrene, divinylbenzene, vinyltoluene,
Examples thereof include diallyl phthalate, various acrylate monomers, and various methacrylate monomers. Among them, styrene and methyl methacrylate are preferably used in terms of price and various performances.

The blending amount of the copolymerizable monomer is preferably 1 to 70% by weight, more preferably 3 to 50% by weight in the resin component. If the blending amount is too large, the viscosity of the molding material becomes high, so that sufficient fluidity cannot be obtained at the time of molding, and conversely if it is too small, the adhesiveness tends to decrease.

Examples of organic peroxides include ketone peroxides such as methyl ethyl ketone peroxide, diacyl peroxides such as isobutyryl peroxide, hydroperoxides such as cumene hydroperoxide, and dicumyl peroxide. Dialkyl peroxides, alkyl peresters such as t-butylperoxy-2-ethylhexanoate, 1,
Examples include peroxyketals such as 1-dibutylperoxycyclohexane, and t-butylperoxybenzoate, t-butylperoxyisopropyl carbonate and the like are generally used.

The amount of peroxide blended is 10 based on the sum of thermosetting resin having reactive unsaturated bond and copolymerizable monomer.
0.3 to 5 parts by weight is preferable with respect to 0 parts by weight, and 0.5
-5 parts by weight is more preferred. If the compounding amount is too small, the curing speed of the molding material tends to be slow, and conversely, if it is too large, yellowing is likely to occur during curing of the molding material.

A handle material can be mixed in the thermosetting molding material. Examples of usable pattern materials include colored mica, colored resin chips, natural stone particles, colored cold water stone, colored aluminum, colored glass flakes, and the like. As the size of the handle material, the diameter or the maximum diameter is preferably 0.1 to 4 mm, more preferably 0.3 to 2.5 mm.
It is. If the size is too small, the design of the pattern material hardly appears, and if the size is too large, kneading tends to be difficult.

When the transparent thermosetting molding material contains a pattern material, its content is preferably 0.5 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the resin component. More preferable. If the content is too small, the design of the pattern material is hardly expressed, and if it is too large, transparency cannot be obtained.

When the coloring thermosetting molding material contains a pattern material, its content is preferably 0.5 to 40 parts by weight, and 1 to 30 parts by weight, based on 100 parts by weight of the resin component. More preferable. If the content is too small, the design of the pattern material will not be exhibited, and conversely, if it is too large, the viscosity of the molding material will be high, and sufficient fluidity in the mold cannot be obtained during molding.

Further, in the thermosetting molding material, an appropriate amount of a color pigment or an inorganic filler can be mixed depending on the purpose and application. As the color pigment, conventionally known pigments can be used, for example, titanium oxide, benzidine yellow, titanium yellow, Hansa yellow, molybdate orange,
Yellow lead, disazo yellow, benzine orange, quinacridone red, quinacridone magenta, naphthol violet, chrome green, phthalocyanine green, alkali blue, cobalt blue, phthalocyanine blue, iron oxide (red iron oxide), copper azo brown, aniline black, carbon black, iron Various well-known and common ones such as black, aluminum flakes, nickel powder, etc. can be mentioned.

Among them, titanium oxide, titanium yellow, quinacridone red, quinacridone magenta, phthalocyanine blue, iron oxide (red iron oxide), carbon black,
Iron black, aluminum flakes and the like are preferably used because they have little influence on the curability of the molding material.

Examples of the inorganic filler include elemental minerals such as graphite, halogenated minerals such as rock salt and potassium rock salt,
Carbonate minerals such as calcium carbonate, phosphate minerals such as cyanite, vanadate minerals such as carnolite, sulfate minerals such as barite (barium sulfate) and gypsum (calcium sulfate), borates such as borax Minerals, titanate minerals such as perovskite,
Silica minerals such as mica, talc (talc), pyrophyllite, kaolin, quartz and feldspar, metal oxides such as titanium oxide, corundum (aluminum oxide) and aluminum hydroxide,
Natural or artificial minerals such as glass products such as (hollow) glass spheres, processed or purified or processed minerals, and mixtures thereof are used.

When a coloring pigment or an inorganic filler is mixed in the transparent thermosetting molding material, the content of the coloring pigment is preferably 0 to 5 parts by weight, more preferably 100 parts by weight of the resin component. The content of the inorganic filler is preferably 0 to 3 parts by weight, the content of the inorganic filler is preferably 0 to 30 parts by weight, and more preferably 0 to 20 parts by weight, based on 100 parts by weight of the resin component. As the content of the filler, the resin component 1
The amount is preferably 0 to 30 parts by weight, more preferably 0 to 20 parts by weight, based on 00 parts by weight.

If the content is too large, the transparency of the molding material tends to decrease. However, for example, in the case of containing an inorganic filler having a refractive index similar to that of the thermosetting resin, as in the case where glass powder is mixed with the unsaturated polyester resin,
Since the transparency of the material hardly decreases even if the content of the inorganic filler is added in the above range or more, the content of the inorganic filler is preferably 0 to 300 parts by weight with respect to 100 parts by weight of the resin component, It is more preferably 0 to 250 parts by weight, and the content of the sum of the color pigment and the inorganic filler is preferably 0 to 300 parts by weight, and more preferably 0 to 250 parts by weight. If the contents of the color pigment and the inorganic filler are too large, the viscosity of the material increases, and it is difficult to obtain sufficient fluidity in the mold during molding.

When the coloring thermosetting molding material contains a coloring pigment or an inorganic filler, the content of the coloring pigment is preferably 1 to 100 parts by weight, more preferably 100 parts by weight of the resin component. It is preferably 3 to 50 parts by weight, and the addition amount of the inorganic filler is 0 to 3 with respect to 100 parts by weight of the resin component.
00 parts by weight is preferable, more preferably 0 to 250 parts by weight, and the content of the sum of the color pigment and the inorganic filler is 30.
Is preferably 320 to 320 parts by weight, more preferably 40 to 20 parts by weight.
0 parts by weight. If the content of the coloring pigment or the inorganic filler is too small, it is difficult to obtain sufficient hiding property of the material. On the contrary, if the content is too large, the viscosity of the material becomes high and it is difficult to obtain sufficient fluidity in the mold during molding.

In the thermosetting molding material, as a reinforcing material,
For example, various reinforcing fibers such as glass fiber and carbon fiber may be mixed in an appropriate amount. The content of the reinforcing material is 100 resin components.
The amount is preferably 1 to 100 parts by weight, more preferably 3 to 90 parts by weight, based on parts by weight. If the content is too small, sufficient reinforcement hardening cannot be obtained, and if too large, it is difficult to obtain sufficient fluidity in the mold during molding.

Here, as the content of the reinforcing material increases,
Since the reinforcing material tends to stand out on the surface, it is better not to mix it on the surface side, that is, the transparent thermosetting molding material, but to the coloring thermosetting molding material to obtain a product with a better appearance. It is preferable because it is possible.

In the thermosetting molding material, if necessary,
Dimethylaniline, known curing accelerators such as cobalt naphthenate, polymerization inhibitors such as parabenzoquinone, azo dyes, anthraquinone-based, indigoid-based, stilbene-based dyes, conductivity imparting agents such as carbon black, emulsifiers, Metal soaps such as zinc stearate, aliphatic phosphates,
An appropriate amount of a release agent such as lecithin can be mixed depending on the use and purpose.

The transparency of the transparent thermosetting molding material is, of course, preferably 100% of the light transmittance, but after molding,
If the colored SMC can be seen in the back of the transparent sheet, the effect of the present invention can be achieved. Therefore, the thickness varies slightly depending on the thickness design of the transparent layer of the target molded article. For example, the thickness of the transparent layer is 5
In the case of about 0 μm to 5 mm, the effect of the present invention can be achieved as long as it has a light transmittance of about 20% at a thickness of 1 mm, but normally, a light transmittance of about 30% at a thickness of 1 mm is achieved. Those having are more preferable.

Further, in the case of designing a transparent layer having a thickness of several cm, the above-mentioned materials may not have sufficient transparency in some cases. The content of the material and the reinforcing material is reduced, and the compounding is improved by reducing the difference between the resin and the refractive index of the inorganic filler and the reinforcing material.

Specific examples of blending the transparent thermosetting molding material include, for example, a styrene solution of an unsaturated polyester resin, an epoxy acrylate resin, and a urethane acrylate resin (styrene concentration 40 to 70% by weight) 60 to 100.
% Of the total amount of the resin component consisting of 0-40% by weight of a styrene solution of a thermoplastic resin such as polymethylmethacrylate, polystyrene, polyvinyl acetate (styrene concentration 40-70% by weight), and t-butylperm 0.7 to 2.5 parts by weight of an organic peroxide such as oxybenzoate,
Coloring pigments such as titanium oxide, iron oxide, carbon black 0
To 2 parts by weight and 0 to 15 parts by weight of inorganic filler powder consisting of inorganic filler powder such as calcium carbonate and aluminum hydroxide, and a total of 0 to 15 parts by weight are kneaded to form a compound, which is a glass fiber or the like. 5 to 80 parts by weight of the reinforcing material may be impregnated into the form of SMC or BMC.

Specific examples of blending of the coloring thermosetting molding material include, for example, a styrene solution of an unsaturated polyester resin, an epoxy acrylate resin and a urethane acrylate resin (styrene concentration 40 to 70% by weight) 60 to 100.
% Of the total amount of the resin component consisting of 0-40% by weight of a styrene solution of a thermoplastic resin such as polymethylmethacrylate, polystyrene, polyvinyl acetate (styrene concentration 40-70% by weight), and t-butylperm 0.7 to 2.5 parts by weight of an organic peroxide such as oxybenzoate,
A total of 70 to 180 parts by weight of inorganic components consisting of 5 to 20 parts by weight of color pigments such as titanium oxide, iron oxide, carbon black and titanium yellow, and 60 to 160 parts by weight of inorganic filler powder such as calcium carbonate and aluminum hydroxide. The compound added with is kneaded to form a compound, and the compound is impregnated with 5 to 80 parts by weight of a reinforcing material such as glass fiber to form SMC or BMC.

The method for producing a molded article of the present invention uses the above materials and takes the following processes. In the present invention, as the molding machine, a conventionally known press molding machine can be used. In the present invention, a conventionally known mold or casting mold can be used as the mold. The type of the molding die may be a left-right type (horizontal type) or a vertical type (vertical type), but generally, a vertical type is preferable. In this case,
Usually, the upper mold is used as a movable mold and the lower mold as a fixed mold.

A molding die is attached to the molding machine, and 80 to 180
After heating to 0 ° C, the transparent thermosetting molding material, the transparent sheet, and the coloring thermosetting molding material are superposed in this order in the molding die, and the mold is clamped at a pressure of 10 to ²⁰ kg / cm ² . After pressure molding for 30 seconds to 15 minutes to cure the three members integrally, the mold is opened and the product is demolded to obtain a laminated decorative molded product.

On the contrary to the above, the coloring thermosetting molding material, the transparent sheet and the transparent thermosetting molding material may be superposed in this order in the molding die. Alternatively, the three members may be superposed on each other before being fed into the molding die and then fed into the molding die.

The charge pattern of each material is as follows.
It is preferable to make the charging area as large as possible so that each material does not flow so much during molding. If the charge area is small, the thickness of each molding material tends to be non-uniform. The size of the transparent sheet is preferably close to the size of the molded product,
When it is provided only on a part of the molded product, a small product corresponding thereto may be used.

As a form of the molded article obtained by the present invention, as shown in FIG. 1, the coloring molding material layer 3, the transparent sheet layer 2, and the transparent molding material layer 1 are arranged in this order from the bottom. A laminated state, as shown in FIG. 2, a pattern-adhering color molding material layer 5, a transparent sheet layer 2, and a transparent molding material layer 1 are laminated in this order from the bottom. As shown in FIG. 3, a pattern-adhesive coloring molding material layer 5, a transparent sheet layer 2, and a patterned transparent molding material layer 4 are laminated in this order from the bottom. . Further, in place of the coloring molding material layer 3 and the pattern-adhering coloring molding material layer 5 described above, a transparent molding material layer 1 and a patterned transparent molding material layer 4 may be provided in a laminated state. .

(Function) According to the method for producing a molded article of the present invention, the first thermosetting molding material and the second thermosetting molding material are superposed with a transparent sheet interposed therebetween. A method of manufacturing a molded article, which comprises heat-press molding together,
By using a transparent thermosetting molding material for at least one of the first thermosetting molding material and the second thermosetting molding material, the first thermosetting molding material and the second thermosetting molding material are used.
When a transparent thermosetting molding material is used for one side and a colored thermosetting molding material is used for the other side among the thermosetting molding materials of 1), the transparent thermosetting at the portion where the transparent sheet is present at the time of molding Since the thermosetting molding material and the coloring thermosetting molding material do not mix, when viewed from the surface, for example, the pattern is not visible in the shallow layer but the pattern is visible in the deep layer, It is possible to obtain a molded article which has a sense of depth and transparency such that the pattern in the shallow layer and the pattern in the deep layer look three-dimensional, and which has a high-grade feeling and the like and which is excellent in design.

When a transparent thermosetting molding material is used as both the first thermosetting molding material and the second thermosetting molding material, the transparent thermosetting material is used at the portion where the transparent sheet is interposed during molding. The transparent molding material and the transparent thermosetting molding material do not mix, so by using a combination that is transparent and has a subtle difference in color tone and pattern, the pattern etc. does not settle down and it can be seen from the surface. For example, when you can't see the pattern in the shallow layer, but you can see the pattern in the deep layer, or the pattern in the shallow layer and the pattern in the deep layer look three-dimensional, a sense of transparency. It is possible to obtain a molded product having a high quality and excellent design.

In the present invention, since the step of spraying a gel coat on the molding die and the post-processing such as coating after demolding are not required, the productivity is usually the same as that of a press-molded article without decoration. A molded product having an excellent design can be manufactured. In addition, since the transparent sheet is not exposed on the surface of the obtained molded product, the hot water resistance is not hindered.

[0057]

Embodiments of the present invention will be described below. 1. Preparation of molding machine and molding die As a molding die, a 300-ton press molding machine manufactured by Kawasaki Yuko Co., Ltd. was prepared. As a forming die, a die including an upper die and a lower die for forming a 30 cm × 30 cm square flat plate, in which an electric heater and a cooling pipe were both embedded, was prepared. This mold was attached to a press molding machine, and the upper mold was made a movable mold and the lower mold was made a fixed mold.

2. Preparation of transparent thermosetting molding material The following three types were prepared as transparent thermosetting molding materials. (1) 70 parts by weight of SMC1 unsaturated polyester resin liquid [unsaturated isophthalic polyester resin (number average molecular weight of about 2000) dissolved in styrene (styrene concentration 40% by weight)] and polystyrene resin liquid [polystyrene ( (Weight concentration average molecular weight of about 95,000) dissolved in styrene (styrene concentration 65% by weight)] 30 parts by weight, a curing agent (t-butyl peroxybenzoate) 1 part by weight, and a thickener [magnesium oxide powder (Kyowa Chemical Co., Ltd. 1 part by weight of Kyowamag 150 manufactured by Kogyo Co., Ltd.) and 3 parts by weight of an internal mold release agent (zinc stearate (Sakai Chemical Co., Ltd.)) are mixed and sufficiently kneaded. , Glass fiber [Roving made by Asahi Fiber Glass Co., Ltd. (ER4630LB
D166W) cut to a length of 25 mm] Impregnated in 25 parts by weight and aged for 24 hours at 40 ° C., thickness 2 m
m transparent SMC1 was obtained.

In the above step, after impregnating the glass fiber, a part of the material before being matured was taken out and compressed using the above press molding machine and mold to obtain a sheet having a thickness of 1 mm. After aging this in the same manner as in the above step, the light transmittance was specified. The result was 53%.

(2) SMC2 Further, 2 parts by weight of a white pattern material (colored mica, average major axis about 2 mm: manufactured by Ito Sangyo Co., Ltd.) and 1 part by weight of black patterned material (colored mica, average major axis about 1 mm: manufactured by Ito Sangyo Co., Ltd.) Parts were mixed with 1 part by weight of a curing agent (t-butyl peroxydibenzoate), and transparent SMC2 having a thickness of 2 mm was obtained in the same manner as SMC1. The light transmittance of this material was specified as in SMC1. The result was 43%.

(3) 100 parts by weight of BMC unsaturated polyester resin liquid (same as used for SMC1), 1 part by weight of curing agent (same as used for SMC1), and inorganic filler (spherical glass powder, 200 parts by weight of Toshiba Ballotini Co., Ltd. and 1 part by weight of a coloring pigment (phthalocyanine blue powder, manufactured by Dainichi Seika Kogyo Co., Ltd.),
1 part by weight of a thickening agent (the same as that used for SMC1) and 2 parts by weight of an internal release agent (the same as that used for SMC1)
Glass fiber [Roving made by Asahi Fiber Glass (E
R4630LBD166W) cut into a length of 5 mm] 3 parts by weight were mixed, sufficiently kneaded, and aged at 40 ° C. for 24 hours to obtain a transparent BMC of 9 cm × 10 cm × 2 cm. The light transmittance of this material was specified as in SMC1. The result was 71%.

2. Preparation of Coloring Thermosetting Molding Material The following two types were prepared as the coloring thermosetting molding materials. (1) SMC3 Further, calcium carbonate powder (manufactured by Nitto Koka Co., Ltd., trade name “N
S-100 ") and 120 parts by weight of color pigment (titanium oxide powder, manufactured by Sakai Chemical Industry Co., Ltd., trade name" SR-1 ") 6 parts by weight were mixed in the same manner as SMC1 and had a thickness of 2 m.
m of a coloring SMC3 was obtained. About this material, SM
The light transmittance was specified similarly to C1. The result is 2.3
%Met. (2) SMC4 Further, 2 parts by weight of a white pattern material (colored mica, average major axis about 2 mm: manufactured by Ito Sangyo Co., Ltd.) and 1 part by weight of black pattern material (colored mica, average major axis about 1 mm: manufactured by Ito Sangyo Co., Ltd.) A coloring SMC4 having a thickness of 2 mm was obtained in the same manner as SMC3 except that 1 part by weight of a curing agent (t-butylperoxydibenzoate) was mixed. The light transmittance of this material was specified as in SMC1. The result was 1.5%.

3. Preparation of transparent sheet The following were used as the transparent sheet. , (1) Transparent sheet 1: Overlay paper (thickness 0.1
2 mm: 85 g / m ² , light transmittance of 55%, manufactured by Kojinsha,
(Product name "PAN-3A") (2) Transparent sheet 2: cloth (made of nylon, thickness 0.1m)
m, 90 g / m ² , light transmittance 48%,) (3) Transparency sheet 3: non-woven fabric (made of polyester, thickness 0.36 mm, 40.7 g / m ² light transmittance 68%, manufactured by Toray DuPont) , Product name "Sontara # 8000")

4. Molding method The above molding material and the transparent sheet were molded as follows. Example 1 After heating the upper mold to 140 ° C. and the lower mold to 150 ° C., one transparent thermosetting molding material (SMC1) cut into a size of 30 cm × 30 cm was supplied onto the lower mold, and 28c on top
One transparent sheet 1 cut into a size of m × 28 cm is placed, and two colored thermosetting molding materials (SMC3) cut into a size of 30 cm × 30 cm are placed on the transparent sheet 1. Was tightened and pressure-molded at a pressure of 100 kg / cm ² for 240 seconds. After that, the mold was opened and the mold was released to obtain a molded product.

Examples 2 to 7 Molded articles were prepared in the same manner as in Example 1 except that the transparent thermosetting molding material, the transparent sheet and the coloring thermosetting molding material shown in Table 1 were used. Got In addition, in Table 1,
What is described as "BMC" is the above BMC
One piece having a size of cm × 10 cm × 2 cm was used.

Comparative Examples 1 and 2 The same as Example 1 except that the transparent sheet was not used and that the transparent thermosetting molding material and the coloring thermosetting molding material shown in Table 1 were used. Then, a molded product was obtained. In Table 1, as "BMC", one BMC having a size of 9 cm x 10 cm x 2 cm was used.

[0067] 5. Evaluation method The following evaluations were performed on the molded products obtained in Examples 1 to 8 and Comparative Examples 1 and 2. Appearance: The appearance of the surface was evaluated by visually observing from the upper surface of each molded product. Thickness of transparent layer (sum of transparent molding material layer and transparent sheet layer): The center of each molded product was cut, the thickness of the transparent layer was measured for the cross section, and the maximum and minimum values of the thickness were recorded. .

Gloss: JIS-K-5 for each molded product
The gloss value was measured by a gloss meter (Gloss Checker IG-300, manufactured by Horiba Ltd.) according to 400 "General Test Method for Paint" 6.7 "60 degree specular gloss".

The results are shown in Table 1. In the appearance column in Table 1, ◯, Δ, and × represent the following states. ◯: A transparent layer is formed on the entire surface. (Triangle | delta): The transparent layer is formed in the area of about half of the surface, and the transparent layer and the coloring layer are formed in the state which mixed with the remaining part. X: Most of the surface is formed in a state where the transparent layer and the coloring layer are mixed.

[0070]

[Table 1]

[0071]

EFFECT OF THE INVENTION Since the method for producing a molded article of the present invention is constructed as described above, it is possible to obtain a heat-pressed molded article having a deep feeling, a transparent feeling, a high-class feeling and an excellent design. Obtainable.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a molded product obtained by the present invention.

FIG. 2 is a cross-sectional view showing another example of a molded product obtained by the present invention.

FIG. 3 is a cross-sectional view showing still another example of the molded product obtained by the present invention.

[Explanation of reference numerals] 1 transparent molding material layer 2 transparent sheet 3 coloring molding material layer 4 transparent molding material layer with handle 5 pattern-adhering coloring molding material layer

Claims (1)

[Claims] 1. Production of a molded article in which a first thermosetting molding material and a second thermosetting molding material are superposed on each other with a transparent sheet interposed therebetween and heated and pressure-molded. A method comprising the first thermosetting molding material and the second thermosetting molding material
A method for producing a molded article, characterized in that a transparent thermosetting molding material is used as at least one of the thermosetting molding materials.