JPH08318608A - Translucent resin molding and manufacture thereof - Google Patents

Abstract

PURPOSE: To simply manufacture a translucent resin molding having a deep rift pattern by providing a colored layer having the rift pattern on the rear surface of a translucent base material layer of a cured thermosetting resin composition in which a rift pattern imparting material is dispersed. CONSTITUTION: A translucent base material sheet 11' made of thermosetting resin composition containing rift pattern imparting material is charged in a press mold 2 having an upper mold 21 and a lower mold 22, mold-clamped, thermally press molded, and then the mold is opened to obtain a translucent base material layer 11". Then, the rear surface of the layer 11" is coated with colored layer forming material 12' having a rift pattern, again mold-clamped, thermally press molded, and then the mold is opened to a translucent resin molding 1. The thermosetting resin includes, unsaturated polyester resin, or vinyl ester resin. The rift pattern imparting material includes polyester resin like multi-colored gelcoat, cured material of acrylic resin, mica or flake.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a translucent resin molded product having a stone pattern with a feeling of depth and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, there have been widely used methods for obtaining a molded article by molding and curing a thermosetting resin composition containing an inorganic filler in a thermosetting resin such as an unsaturated polyester resin, an acrylic resin or an epoxy resin. Are known. As such molded articles, they are widely used as bathtubs, washstands, kitchen counters, tables and the like. In addition, the one with a transparent feeling is especially appreciated as a high-class image.

As a method of imparting transparency, for example,
As described in JP-A-63-239045, a surface layer is a clear gel coat layer, an intermediate layer is a semitransparent resin concrete layer composed of a mixture of a polyester resin and a glassy filler having a refractive index similar thereto, and a back layer. Artificial marble composed of a glass mat reinforcing layer containing a colorant has been proposed.

[0004]

However, in the case of the conventional artificial marble as described above, the intermediate layer is composed of the semitransparent resin concrete layer.
For example, a glass mat strengthening layer is formed on a female mold, a clear layer is formed on a male mold, then both molds are combined, and a resin concrete layer is injected and cured between the glass mat strengthening layer and the clear layer. It is necessary to go through the steps, and the semi-transparent resin concrete layer has a pattern even though the coloring of the glass mat strengthening layer can be made into a deep transparent color tone by refracting the light rays passing through the layer. However, there is a problem in that a pattern with a sense of depth cannot be made to appear.

The present invention has been made for the purpose of solving the above-mentioned conventional problems and providing a semi-transparent resin molded product having a stone pattern with a feeling of depth and a simple manufacturing method thereof. .

[0006]

The invention according to claim 1 of the present application (hereinafter referred to as the present invention 1) is a semitransparent group obtained by curing a thermosetting resin composition in which a grain pattern imparting material is dispersed. It is a semitransparent resin molded product in which a colored layer having a stone pattern is provided on the back surface of the material layer.

The invention according to claim 2 of the present application (hereinafter referred to as the present invention 2) is a semi-transparent molded product having a corner portion, wherein a thermosetting resin composition in which a stone pattern imparting material is dispersed is provided. It is a semitransparent resin molded product in which a dark colored layer is provided at the corner of the back surface of the cured semitransparent base material layer.

The invention according to claim 3 of the present application (hereinafter referred to as the present invention 3) is a semi-transparent base material sheet formed from a thermosetting resin composition containing a stone pattern imparting material by heat and pressure molding. It is a method for producing a translucent resin molded article, in which a transparent substrate layer is formed and a colored layer is provided on the back surface of the translucent substrate layer.

The invention according to claim 4 of the present application (hereinafter referred to as the present invention 4) is a method for producing a semitransparent molded article having a corner portion, which is a thermosetting resin composition containing a stone pattern imparting material. A semi-transparent base material sheet is formed by heating and pressing a semi-transparent base material sheet to form a semi-transparent base material layer, and a dark colored layer forming material is provided at a corner portion on the back surface of the semi-transparent base material layer. It is a manufacturing method.

In the present invention, the thermosetting resin composition is
It comprises a thermosetting resin, a curing agent, a filler, and if necessary, a curing accelerator, an inhibitor, a reinforcing material, an internal release agent, a thickener, a low shrinkage agent, a pigment, a resin chip and the like. As the thermosetting resin, any known one can be used, and examples thereof include unsaturated polyester resin, epoxy resin, vinyl ester resin, acrylic resin, urethane resin and the like.

Examples of the curing agent include t-butylperoxybenzoate, benzoylperoxide, methyl ethyl ketone peroxide, dicumyl peroxide, t-butylperoxy-2-ethylhexanoate, 1,1-di-t. Examples include organic peroxides that act on thermosetting resins such as butyl butyloxy cyclohexane and t-butylperoxy isopropyl carbonate.

Examples of the filler include calcium carbonate, magnesium carbonate, barium sulfate, talc, clay, mica, silica, alumina, glass powder, aluminum hydroxide, magnesium hydroxide, cold water stone, silica sand, and the like. May be used alone or in combination of two or more. Of these, glass powder, aluminum hydroxide, and the like are preferably used in order to obtain a deep feeling of the molded product, and it is preferable that the thermosetting resin and the filler have similar refractive indexes. The amount of the filler added is 10
50 to 360 parts by weight is preferable with respect to 0 parts by weight.

Examples of the reinforcing material include glass fibers, organic fibers such as polyester, phenol and vinylon, carbon fibers and the like, and generally glass fibers are used.

As the low-shrinking agent, for example, polyethylene, polystyrene, polymethylmethacrylate, polyvinyl chloride, polyvinyl acetate, polycaprolactam, thermoplastic resins such as saturated polyester, polybutadiene, polystyrene-acrylonitrile copolymer and the like are used. To be done.

Examples of the internal release agent include higher fatty acids and higher fatty acid salts such as stearic acid and zinc stearate,
An alkyl phosphate ester or the like is used.

The thickening agent is chemically bonded to, for example, a hydroxyl group, a carboxyl group or an ester group contained in the unsaturated polyester to form a linear or partial cross-linking, thereby increasing the molecular weight, thereby forming an unsaturated polyester resin. Thickeners, for example, diisocyanates such as toluene diisocyanate, aluminum isopropoxide, metal alkoxides such as titanium tetrabutoxide, magnesium oxide, calcium oxide, oxides of divalent metals such as bryllium oxide, Examples thereof include hydroxides of divalent metals such as calcium hydroxide.

As the stone pattern imparting agent, a cured product of polyester resin such as multicolor gel coat or acrylic resin,
Mica, flakes and the like are used.

In the present invention, the semitransparent of the semitransparent substrate layer means that the light transmittance measured according to JIS K7105 is 5 to 90%. When the light transmittance is less than 5%, the clearness of the stone pattern of the obtained semi-transparent resin molded product is lost, and when it exceeds 90%, the sense of depth of the stone pattern of the obtained semi-transparent resin molded product is lost. .

In the present inventions 1 and 3, in order to form a colored layer having a stone pattern, a multicolor coating using a general paint or a multicolor gel coating method can be adopted. As the gel coat resin, for example, unsaturated polyester resin, vinyl ester resin, methyl methacrylate resin, etc. are used.

In the present inventions 2 and 4, in order to form the dark color layer, coating using a general dark color paint or a dark color gel coating method can be adopted.

The present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view showing an example of a semitransparent resin molded product of the present invention. Reference numeral 1 is a semi-transparent resin molded product, and a colored layer 1 having a stone pattern on the back surface of the semi-transparent base material layer 11 on which the thermosetting resin composition in which the stone pattern imparting material 111 is dispersed is cured.
2 are provided.

FIG. 2 is a sectional view for explaining an example of a method of manufacturing the semitransparent resin molded product shown in FIG. First, FIG.
As shown in (a), a semitransparent substrate sheet 11 'is prepared from a thermosetting resin composition containing a stone pattern imparting material.
As shown in FIG. 2A, the semi-transparent base material sheet 11 ′ is charged into a press-molding die 2 composed of an upper die 21 and a lower die 22 to perform mold clamping, and then heat and pressure molding is performed. , The mold is opened, and the semitransparent base material layer 1 as shown in FIG.
Get 1 ''.

Next, as shown in FIG. 2 (b), a colored layer forming material 12 'having a stone pattern is applied to the back surface (upper surface in the drawing) of the semitransparent base material layer 11'', and again. The mold is clamped, heated and pressure-molded, and then the mold is opened to obtain a translucent resin molded product 1 as shown in FIG.

FIG. 3 is a sectional view for explaining another example of the semitransparent resin molded product of the present invention. 3 is a semitransparent resin molded product, and has a corner portion 3A. A dark colored layer 32 is provided on the corner portion 31A on the back surface of the semitransparent base material layer 31 on which the thermosetting resin composition in which the stone pattern imparting material 311 is dispersed is cured.

FIG. 4 is a sectional view for explaining an example of a method of manufacturing the semitransparent resin molded product shown in FIG. First, FIG.
As shown in (a), a semitransparent substrate sheet 31 'is prepared from a thermosetting resin composition containing a stone pattern imparting material.
As shown in FIG. 4A, the semi-transparent base material sheet 31 ′ is charged into a press-molding die 2 composed of an upper die 21 and a lower die 22 to perform mold clamping, and then heat-press molding. , The mold is opened, and as shown in FIG.
Get 1 ''.

Next, as shown in FIG. 4 (b), a dark colored layer forming material 32 'is applied to the back surface (upper surface in the drawing) of the semitransparent base material layer 31'', and the mold is clamped again. After performing heat and pressure molding, the mold is opened to obtain a semitransparent resin molded product 3 as shown in FIG.

[0027]

The semitransparent resin molded article of the present invention 1 has a colored layer having a stone pattern on the back surface of the semitransparent base material layer on which the thermosetting resin composition in which the stone pattern imparting material is dispersed is cured. By being provided, a synergistic effect of the normal depth feeling due to the stone pattern imparting material dispersed in the semitransparent base material layer and the colored layer having a stone pattern provided on the back surface of the semitransparent base material layer Depending on the effect,
It has a stone pattern with a deeper feeling than the conventional one.

The semi-transparent resin molded article of the present invention 2 has a dark colored layer at the corner of the back surface of the semi-transparent substrate layer obtained by curing the thermosetting resin composition in which the stone pattern imparting material is dispersed. By being provided, the synergistic effect of the normal depth feeling due to the stone pattern imparting material dispersed in the semitransparent base material layer and the dark colored layer provided in the corner portion of the back surface of the semitransparent base material layer Due to the effect, it has a stone pattern with a deeper feeling than the conventional one.

In the method for producing a translucent resin molded article of the present invention 3, a translucent substrate sheet is heat-pressed from a thermosetting resin composition containing a stone pattern imparting material to form a translucent substrate layer. By forming a colored layer on the back surface of the semi-transparent base material layer, a normal depth feeling due to the stone pattern imparting material dispersed in the semi-transparent base material layer and a corner on the back surface of the semi-transparent base material layer Due to the synergistic effect with the dark colored layer provided in the part, it is possible to manufacture a translucent resin molded product imparted with a stone pattern having a more deep feeling than the conventional one.

The method for producing a translucent resin molded article according to the present invention 4 is to heat-press a translucent substrate sheet from a thermosetting resin composition containing a stone pattern imparting material to form a translucent substrate layer. By forming a dark colored layer forming material at the corner portion of the back surface of the semitransparent base material layer formed, a normal depth feeling due to the stone pattern imparting material dispersed in the semitransparent base material layer, Due to the synergistic effect with the dark colored layer provided at the corner of the back surface of the transparent base material layer, it is possible to manufacture a translucent resin molded product with a stone pattern with a deeper feeling than the conventional one. it can.

[0031]

The present invention will be described below with reference to examples. Example 1 According to the process described with reference to FIG. 2A, the semitransparent base material sheet 11 'is heat-pressed by a press-molding die to form a semitransparent base material layer 11' having a thickness of 6 mm. Got ‘

As the thermoplastic resin composition in which the stone pattern is dispersed, 100 parts by weight of an unsaturated polyester resin (having isophthalic acid and propylene glycol maleate as main components) is added to glass as a filler. 300 parts by weight of powder (manufactured by Nippon Fellow, trade name "M-500S") and aluminum hydroxide (manufactured by Sumitomo Chemical Co., Ltd., trade name "CW"
L-326S ") 50 parts by weight, zinc stearate 3 parts by weight as an internal plasticizer, magnesium oxide 2 parts by weight as a thickener, and tert-butyl perbenzoate (TBPB) 1 part by weight as a curing agent. And 20 parts by weight of glass fiber (fiber length 5 mm) as reinforcing fiber, 3 parts by weight of pigment (pink), and 10 parts by weight of resin chip as a stone pattern imparting material, and mixed by a kneader Was used.

The molding conditions are as follows: molding temperature 130
° C., molding pressure 100 kgf / cm ^2, and a molding time of 4 minutes.

Next, by the process described with reference to FIG. 2B, the back surface of the semitransparent base material layer 11 '' (the upper surface in the drawing).
The colored layer 1 having a stone pattern by the multicolor gel coat
2'was applied, the mold was clamped again, and heat and pressure molding was performed to obtain a translucent resin molded product 1 as shown in FIG. The multicolor gel coat was prepared by mixing carbon (made by Koshin Chemical Co., Ltd., trade name “63B1 Black” with 100 parts by weight of a mixed resin in which a vinyl ester resin and a polyester resin were mixed at a ratio of 1: 1 (weight ratio). )) 1 part by weight and a mixture of 1 part by weight and titanium oxide (manufactured by Koshin Chemical Co., Ltd., trade name "63B1 White") by weight, were sprayed from separate nozzles. In addition, the molding conditions include a molding temperature of 130
° C., molding pressure 20 kgf / cm ^2, and a 4 minute hold time.

Semi-transparent base material layer 11 '' obtained during the process
Had a light transmittance of 25.3%. The translucent molded product thus obtained was subjected to a sensitivity test of depth and transparency by 20 panelists and evaluated according to the following scoring criteria. The results are shown in Table 1.

Sensitivity test 3 points: depth and transparency. 2 points: A slight sense of depth and transparency is felt. 1 point: Depth and transparency are not felt. Scoring criteria 50 points or more: ◎, 40 points or more: ○, 30 points or more: △, 3
Less than 0 points: ×.

Example 2 The amount of the pigment added to the thermoplastic resin composition in which the stone pattern was dispersed was 1 part by weight, and a coloring layer molding material having a dense stone pattern was used. A translucent molded article was manufactured in the same manner as in Example 1 except for the above. The light transmittance of the semitransparent base material layer 11 ″ obtained during the process is
It was 34.3%. About the obtained translucent molded product,
The same sensitivity test as in Example 1 was performed. The results are shown in Table 1.

Comparative Example 1 A semi-transparent molded article was produced in the same manner as in Example 1 except that a colored layer molding material having no stone pattern was used. About the obtained semi-transparent molded product, Example 1
The same sensitivity test was conducted. The results are shown in Table 1.

Comparative Example 2 A semi-transparent molded product was produced in the same manner as in Example 2 except that a colored layer molding material having no stone pattern was used. About the obtained semi-transparent molded product, Example 1
The same sensitivity test was conducted. The results are shown in Table 1.

Example 3 According to the process described with reference to FIG. 4 (a), the semi-transparent base material sheet 31 'is heat-pressed and molded by the press-molding die to form the corner portion 31A having a thickness of 6 mm. A semi-transparent base material layer 31 ″ having the above was obtained. The thermoplastic resin composition used and the molding conditions are the same as in Example 1.

Next, by the process described with reference to FIG. 4B, acrylic having a density of 10 times the color of the molded product is formed at the corner of the back surface (upper surface in the drawing) of the semitransparent base material layer 31 ''. Urethane-based paint (manufactured by Dainippon Paint Co., Ltd., trade name "V Seran # 100"
S36-164 ") for forming a dark colored layer forming material
It was applied to an m width and dried to obtain a semitransparent resin molded product 3 as shown in FIG. The translucent molded product thus obtained was subjected to the same sensitivity test as in Example 1. The results are shown in Table 2.

Example 4 A semi-transparent resin molding as shown in FIG. 3 was carried out in the same manner as in Example 3 except that the addition amount of the pigment in the thermoplastic resin composition in which the stone pattern was dispersed was 1 part by weight. Item 3 was obtained. The translucent molded product thus obtained was subjected to the same sensitivity test as in Example 1. The results are shown in Table 2.

Comparative Example 3 Example 1 except that the dark colored layer forming material was not used.
A semi-transparent resin molded product was manufactured in the same manner as in. The translucent molded product thus obtained was subjected to the same sensitivity test as in Example 1. The results are shown in Table 2.

Comparative Example 4 Example 4 except that the dark colored layer forming material was not used.
A semi-transparent resin molded product was manufactured in the same manner as in. The translucent molded product thus obtained was subjected to the same sensitivity test as in Example 1. The results are shown in Table 2.

[0045]

[Table 1]

[0046]

[Table 2]

[0047]

EFFECTS OF THE INVENTION Since the semi-transparent resin molded products of the present inventions 1 and 2 have the above-mentioned constitution, they have a stone pattern with a deeper feeling than the conventional ones.

Since the method for producing a semi-transparent resin molded product of the present invention 3 and 4 is configured as described above, the semi-transparent resin molded product having a stone pattern having a more deep feeling than the conventional one. Can be manufactured.

[Brief description of drawings]

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

2A and 2B are explanatory views of an example of a method for manufacturing the semitransparent resin molded product shown in FIG. 1, in which FIG. 2A is a cross-sectional view illustrating a first half process and FIG. 2B is a second half process. FIG.

FIG. 3 is a cross-sectional view showing another example of the semi-transparent resin molded product of the present invention.

4A and 4B are cross-sectional views illustrating an example of a method for manufacturing the translucent resin molded product illustrated in FIG. 3, in which FIG. 4A is a cross-sectional view illustrating a first half process and FIG. 4B is a second half process. It is sectional drawing explaining.

[Explanation of symbols]

 1,3 Semi-transparent resin layer 3A Corner part 11,31 Semi-transparent base material layer 12 Coloring layer 32 Dark coloring layer 111,311 Stone pattern imparting material

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B32B 27/20 B32B 27/20 Z 31/12 7148-4F 31/12 // B29K 101: 10

Claims (4)

[Claims] 1. A colored layer having a stone pattern is provided on the back surface of a semitransparent base material layer on which a thermosetting resin composition in which a stone pattern imparting material is dispersed is cured. Semi-transparent resin molded product. 2. A semi-transparent molded product having a corner portion, wherein the corner portion on the back surface of the semi-transparent base material layer cured with the thermosetting resin composition in which the stone pattern imparting material is dispersed has a dark color. A semi-transparent resin molded product, which is provided with a colored layer. 3. A semi-transparent base material sheet is formed by heat-pressing a thermosetting resin composition containing a stone pattern imparting material to form a semi-transparent base material layer, and the semi-transparent base material layer is provided on the back surface thereof. A method for producing a semitransparent resin molded article, which comprises providing a colored layer. 4. A method for producing a translucent molded article having a corner portion, wherein a translucent base material sheet is heat-pressed from a thermosetting resin composition containing a stone pattern imparting material to form a translucent substrate. A method for producing a semitransparent resin molded article, which comprises forming a material layer and providing a dark colored layer forming material at a corner portion on the back surface of the semitransparent base material layer.