JPH04366606A - Resin molded product having fresh decorative pattern and its manufacture - Google Patents

Abstract

PURPOSE:To make a color change continuous and finish superior in natural feeling or soft feeling, by constituting the title method so that it has a colored spotted pattern constituted of at least two kinds of colors which are different from each other in any of at least a color phase, chroma and brightness on its surface layer. CONSTITUTION:In a washing and dressing stand, at the time of manufacturing of the washing and dressing stand, whose dressing stand part is made white and washing bowl part is made blue, from silica high filling methacrylate resin by making use of a mold, after a white or blue colored composition is spread on the surface of the mold, silica high filling acrylic syrup is introduced into a system. After the spreading, the mold is assembled and heated, a matter obtained by mixing and agitating high-purity silica is cast, heated, polymerized and cured. With this construction, a white and blue are mixed up appropriately with each other at an interface between the dressing stand part and washing bowl part and the interface possesses a beautiful spotted pattern where various intermediate colors changing continuously from a thin sky-blue up to a deep blue are expressed and is superior in natural feeling and free from unevenness.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a resin molded product and a method for manufacturing the same, and more particularly to a resin molded product having various original patterns with excellent decorative properties on its surface and a method for manufacturing the same. More specifically, resin products used for the interior and exterior of buildings, houses, etc., resins used for curtain walls, wall panels, floor boards, bathroom vanities, kitchen counters, wash basins, bathtubs, shower trays, etc. Related to molded products and their manufacturing methods.

0002

2. Description of the Related Art A resin molded product having a colored spot pattern is described, for example, in Japanese Patent Application Laid-open No. 197346/1983. However, this is a resin molded product that mixes resin with a filler to obtain a speckled pattern, and is not a resin molded product where the speckled pattern is on the surface layer.Also, it is a colored speckled pattern in which the intermediate colors of the colors that make up each speck are continuous. None had a pattern with a pattern of colored spots that varied randomly or discontinuously.

[0003] Furthermore, a method for imparting a stone-like colored spot pattern to resin molded products such as acrylic resin is disclosed in Japanese Patent Laid-Open No. 59-13.
As described in Japanese Patent Publication No. 3254, crushed colored resin is added to the resin raw material liquid, or as described in Japanese Patent Publication No. 1-30777, inorganic powder made of calcium carbonate, crushed stone, fine sand, etc. There is a known method of manufacturing a thermosetting resin molded product with a stone-like pattern by placing it in the resin and curing it. However, in the case of adding crushed resin to give a stone-like pattern as in the former case, if you want to obtain a slightly larger granite-like pattern, you will have to add slightly larger colored resin particles. After molding, the shrinkage rates of the resin particles and the matrix resin during curing were different, causing sink marks on the surface and making the surface uneven. In the latter case, the use of natural minerals may give a beautiful appearance, but these so-called polymer concretes are not only difficult to process, such as cutting, drilling, and gluing, but also difficult to actually use. If hot water comes into direct contact with the sink, for example, the sink,
When used on bathroom floors, bathtubs, etc., the difference in expansion coefficient between the resin and the inorganic material that gives the pattern causes problems in microscopic contact between the two interfaces, causing minute cracks to gradually form. This caused cracks and cracks to occur.

On the other hand, as a method of imparting a colored spot pattern that eliminates these problems of sink marks and cracks, it is also possible to create a pattern by spraying a colored composition such as a paint onto the surface of a resin molded product. Spraying directly onto the surface of a molded product causes unevenness to be formed on the surface, resulting in unfavorable appearance, texture, etc. In addition, in order to give a colored spot pattern by spraying the colored composition and to obtain a resin molded product with no irregularities on the surface, the colored composition is sprayed on the surface of a mold such as a mold before injecting the resin liquid. method is implemented. This method is excellent in that it is inexpensive and easy to apply a colored spot pattern to the surface of a resin molded product, but it only expresses the number of colors corresponding to the number of times the coloring composition is sprayed, and it also produces a so-called polka dot pattern. It has the disadvantage that it can only express circular, spot-like patterns, and cannot express deep patterns with depth, height, or multi-layered feel like natural marble, for example.

[0005]

[Problems to be Solved by the Invention] The present invention is capable of expressing a plurality of neutral tones of a natural stone grain tone on the surface of a resin molded product without unevenness or sink marks, and is capable of expressing a sense of depth and depth, a sense of height and depth, or a multi-layered appearance. To provide a resin molded product having various new and aesthetically pleasing patterns that are rich in variety and have an excellent natural feel, and to provide a method for producing the same.

[0006]

[Means for Solving the Problems] The present invention provides a colored spot pattern composed of two or more colors that differ from each other in at least one of hue, saturation, and brightness, and intermediate colors at various stages. It is a resin molded product characterized by having a surface layer.

The colored spot pattern of the present invention is composed of each color and an intermediate color that changes stepwise or continuously, gradually or suddenly from one color to the other, so that the pattern is laminated into a pattern. Each pattern has a sense of depth and depth or a sense of height and depth, and the depth of the pattern is accompanied by dynamic beauty. In addition, the varied color tones of each level and their combinations give the impression of a change in the color system. For example, when derived from two colors, black and white, colors that give the illusion of yellowish, brownish, bluish, etc. on gray. There is a change in feeling.

Furthermore, the present inventors have invented a method by which a resin molded product having such an excellent pattern can be produced extremely easily. That is, when manufacturing a resin molded product by solidifying or curing the resin using a mold, the surface of the mold is colored in advance with a coloring composition that has the property of being transferred to the surface of the molded product, and the surface of the molded product is colored. By forming an appropriate pattern with the desired color and/or color pattern on the surface of the mold, and then injecting a resin molding material into the mold to transfer the pattern onto the surface of the resin molded product. , a method for producing a resin molded product having a decorative surface, in which a pattern to be transferred to the surface of the molded product is formed on the surface of the mold, using two or more coloring compositions having different hues, saturations, and/or brightnesses. until the liquid droplets of the two or more types of coloring compositions sprayed and sprayed simultaneously or almost simultaneously from at least the same number of nozzles as the types of the coloring compositions reach the surface of the mold, or On the surface of the mold, all or part of the colored compositions are fused to each other, and the mixing ratio is gradually or rapidly changed from the color of each coloring composition before fusion or a color close to it, continuously or discontinuously. by producing droplets having the color of said colored composition and/or a wide variety of colors in between, with or without changing the color of said coloring composition, and optionally adjusting the size of said droplets; By adjusting the mixing ratio of droplets of different sizes, transfer patterns with various desired colors and/or color patterns can be formed on the entire surface or part of the mold surface, thereby creating intermediate colors of various tones. 2 that can be expressed and that differ from each other in at least any of hue, saturation, and lightness
It was possible to obtain a resin molded product having a spotted pattern on its surface layer, which is a mixture of colored speckled patterns consisting of more than one color and intermediate colors at various stages thereof.

[0009] In the case of thermoplastic resins used in the present invention, heating and melting temperatures of 100°C or higher are required, and the colored spot pattern formed in the mold may change. , thermosetting resins are preferred, and examples of resins include acrylic resins, methacrylic resins, phenolic resins, polyester resins, epoxy resins, polyimide resins, urethane resins, etc., but acrylic resins, methacrylic resins and polyester resins are preferred. This is suitable from the viewpoint of the application of the invented molded product.

0010

EXAMPLES The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited to these Examples in any way.

[0011] In the examples, "parts" refer to parts by weight.

Example 1 When manufacturing a bathroom vanity with a white vanity part and a blue vanity bowl part using a mold using a methacrylic resin filled with silica, the surface of the mold was After spraying the white and blue colored compositions, silica-rich acrylic syrup was introduced into the system. The white colored composition is
The blue coloring composition was prepared by stirring and mixing 100 parts of spray paint 1P05 manufactured by Imperial Chemical Industries (UK) with 1 part of bis-(4-t-butylcyclohexyl) peroxydicarbonate and 20 parts of thinner.
Spray paint made by Industries (UK)
A mixture of 100 parts of 7P18, 1 part of bis-(4-t-butylcyclohexyl) peroxydicarbonate and 30 parts of thinner was stirred and mixed using separate spray guns (manufactured by Iwata Painting, nozzle diameter 1.0 mm). Bathroom vanity mold (width 450mm, length 1200mm,
Keeping a distance of 5-40 cm from a depth of 250 mm, the white coloring composition is sprayed from the outside of the vanity part away from the bowl part, while the blue coloring composition is started from the center part of the bowl and sprayed onto the vanity part. The mixture was sprayed for about 4 minutes at the same time near the interface between the ball and the ball. The total amount spread was approximately 50 g each. After spraying, the mold was assembled and heated to 80°C, and 100 parts of a methacrylic resin composition (manufactured by Imperial Chemical Industries (UK), Asterite [registered trademark] Natural) containing 65% high-purity silica (particle size 10 μm or less) was added. A stirred mixture of 1 part of bis(4-t-butylcyclohexyl)peroxydicarbonate was injected and heated at 80°C for 30 minutes and then at 100°C for 30 minutes to polymerize and harden.

[0013] In the obtained washstand, white and blue were appropriately mixed at the interface between the washstand part and the washbowl part, and the interface expressed a variety of intermediate colors that continuously changed from light sky blue to deep blue. It had a beautiful spotted pattern with no unevenness and an excellent natural feel. Example 2 When manufacturing a bathtub, a bathtub mold (width 750 mm) was used.
, length 1400 mm, depth 700 mm) using the same method as in Example 1, the same white coloring composition and wine red coloring composition (Imperial Chemical
Spray paint made by Industries (UK)
4P09 A mixture of 100 parts of bis-(4-t-butylcyclohexyl) peroxydicarbonate and 1 part of bis-(4-t-butylcyclohexyl) peroxydicarbonate was simultaneously sprayed onto the surface of the mold heated to 80°C to create a pattern, and after the spraying, the mold was assembled. A mixture of the same methacrylic resin composition containing 65% high-purity silica (particle size 10 μm or less) and bis-(4-t-butylcyclohexyl) peroxydicarbonate as in Example 1 was injected, polymerized, and cured.

The spraying time was about 8 minutes, and the spray amount was about 150 g for each coloring composition.

[0015] The obtained bathtub has an intermediate color ranging from white to wine red, that is, from light pink to pink, gradually becoming darker wine red, and a beautiful stone grain pattern with rich shading and a continuous mixture of colors. It had a spotted pattern.

Comparative Example 1 The same method as in Example 1 was used, but the white and blue colored compositions were sprayed separately at intervals of 3 minutes, and then a mold was assembled, and high-purity silica (particle size 10 μm) was sprayed. below) 65%
A mixture of the containing methacrylic resin composition and bis(4-t-butylcyclohexyl) peroxydicarbonate was injected, polymerized, and cured.

[0017] The obtained bathroom vanity could not sufficiently express neutral colors, and the interface between the vanity part and the bowl part was too clear, and a beautiful finish could not be obtained.

Example 3 When manufacturing a bathtub, a polyester black gel coat (MC-225 manufactured by Mikuni Shimei Co., Ltd.) and a polyester white gel coat (MC-666 manufactured by Mikuni Shimei Co., Ltd.) were coated with a width of 75 mm.
Separate spray guns (manufactured by Iwata Painting,
Using a nozzle diameter of 1.0 mm), the pattern was sprayed almost simultaneously for about 10 minutes. After the spraying, the mold was assembled, and then 100 parts of unsaturated polyester resin (manufactured by U-Pica Japan) was mixed with polymethyl methacrylate as a low shrinkage agent, 2 parts each of zinc stearate as a mold release agent, 2 parts each of bis(4-t-butylcyclohexyl) peroxydicarbonate as a hardening agent, and W- manufactured by Bick Chemie as a polymeric dispersant.
990 10 parts, aluminum hydroxide as filler (
Sumitomo Chemical C-315 Average particle diameter approximately 15μm) 10
Pour a well-dissolved and dispersed mixture of 0 parts, and heat at approximately 80°C.
Polymerization and curing took place for 30 minutes.

[0019] The obtained bathtub is made of granite that has a rich natural feel and is rich in shading and has no irregularities, with white, black, and intermediate colors between these, that is, a mixed color that continuously changes from light gray to dark gray, giving it a natural feel. It had a pattern of colored spots.

[0020]

Effects of the Invention According to the present invention, a spotted pattern consisting of two or more colors mutually different in at least one of hue, saturation, and brightness and intermediate colors at various stages thereof is formed on the surface layer. It is possible to obtain resin molded products with In order to achieve the effect of the present invention using conventional techniques, countless intermediate coloring compositions are required, and it is necessary to perform spraying an almost infinite number of times, which is laborious and time-consuming.
Furthermore, since spraying from the nozzle is performed sequentially, the first sprayed color and the second sprayed color overlap, making it difficult for either color to be expressed on the surface. Therefore, it becomes difficult to produce an overall natural feeling. According to the present invention, the color changes continuously, resulting in a finish with an excellent natural or soft feel. Further, according to the present invention, it is possible to easily express an excellent stone-like colored spot pattern with a rich natural feel in which the interface changes continuously, which is different from the pattern obtained by conventional methods.

[0021] The colored spot pattern of the present invention is composed of each color and an intermediate color that changes stepwise or continuously, gradually or rapidly, from one color to the other.
The patterns have a layered or depressed feel, and each pattern has a sense of depth and depth, or a sense of height and depth, and is accompanied by both deepness and dynamic beauty. In addition, the variety of color tones in each level and their combinations can create a sense of change in the color system, for example, when derived from two colors, black and white, the color creates the illusion of yellowish, brownish, bluish, etc. in gray. There is a change in

Claims (5)

[Claims] Claim 1: It has a colored spot pattern on its surface layer consisting of two or more colors that differ from each other in at least one of hue, saturation, and brightness, and intermediate colors at various stages of these colors. Characteristic resin molded product. 2. The resin molded product according to claim 1, wherein the resin constituting the resin molded product is made of a thermosetting resin. 3. When manufacturing a resin molded product by solidifying or curing the resin using a mold, the surface of the mold is colored in advance with a coloring composition that is transferred to the surface of the molded product,
A suitable pattern having the desired color and/or color pattern to be transferred to the surface of the molded product is formed on the surface of the mold, and then a resin molding material is injected into the mold to transfer the pattern onto the surface of the resin molded product. In a method for manufacturing a resin molded product having a decorative surface by transfer, when forming a pattern to be transferred onto the surface of the mold on the surface of the mold, the hue, saturation and/or
Alternatively, liquid droplets of two or more coloring compositions having different lightness are ejected and scattered simultaneously or almost simultaneously from at least the same number of nozzles as the types of the coloring compositions, Until it reaches the mold surface,
Or, on the surface of the mold, all or part of the colored compositions are fused together, and the coloring compositions are mixed continuously or discontinuously, gradually or suddenly, starting from the color of each coloring composition before fusion or a color close to it. By producing droplets with the color of said colored composition and/or intermediate colors in their various stages, with or without changing the proportions, and optionally adjusting the size of said droplets, or A resin molded product characterized by forming transfer patterns with various desired colors and/or color patterns on the entire surface or part of the mold surface by adjusting the mixing ratio of droplets of different sizes. manufacturing method. 4. The method for producing a resin molded product according to claim 3, wherein the resin molded product is the resin molded product according to claim 1. 5. The method for producing a resin molded product according to claim 3, wherein the resin constituting the resin molded product is a thermosetting resin.