JPS6047085B2 - Molding method of patterned synthetic resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding a patterned synthetic resin, such as an artificial stone imitating natural marble. By stirring and mixing the synthetic resin composition, it is possible to improve the sense of reality and productivity.

Conventionally, when molding this type of patterned synthetic resin,
Examples include a method in which decorative paper printed with a natural marble pattern is impregnated with a melamine initial condensate solution and then laminated and cured, and a method in which colored liquid synthetic resin is simply injected into a mold and cured.

However, in the former case, with such conventional molding methods, although a somewhat similar pattern can be produced, the pattern printing paper is only hardened on the surface and inside by hard synthetic resin, and the pattern is not printed. It has no depth and almost no sense of reality.

In the latter case, it is possible to add depth to the pattern by selectively combining the types of synthetic resin and filler for marrix, but it is not possible to create a pattern similar to natural stone. Moreover, the white snow-like pattern between crystals, which is unique to onyx and marble patterns, cannot be obtained at all. Furthermore, as a conventional means for producing the above-mentioned onyx and marble patterns, the present applicant developed a technique in April 1973.
Although the prior art described in Japanese Patent Application No. 52-42303 (Japanese Unexamined Patent Publication No. 53-127558) filed on May 13 is known, in this type of molding method, the appearance of the molded product after molding is Although a pattern similar to a natural pattern appeared and was satisfactory, there were various inconveniences such as the troublesome pattern forming work during molding and poor productivity. The present invention aims to eliminate the above-mentioned conventional drawbacks, and will be described below based on the illustrated embodiments.

As shown in Fig. 1, numeral 1 in the figure is a stone-like synthetic resin molded body molded by a molding means described later, and the surface 1a has a pattern a similar to J natural marble, such as onyx or marble pattern. It is appearing.

That is, in order to mold the molded body 1, as shown in FIGS. 2 to 5 as the first embodiment, in the mold 10,
The main translucent casting liquid synthetic resin composition 11 (for example, acrylic resin, unsaturated i-polyester resin, or epoxy resin, etc.) is added to the matrix synthetic resin composition 11, and a translucent material such as aluminum hydroxide, calcium sulfate, calcium phosphate, silica, etc. A different color liquid synthetic resin composition 12 (mixed with a filler) is injected as a first layer, and then immediately a different color liquid synthetic resin composition 12 (for example, Injecting a matrix synthetic resin liquid similar to the first layer with a different color filler or pigment such as titanium white, carbon black, aniline black, titanium yellow, lead white or zinc white as the second layer; or by coating or dispersing the liquid synthetic resin composition 12 of the second layer to at least a part of the depth of the translucent casting liquid synthetic resin composition 11 of the first layer before curing both layers. After stirring and mixing by partially drawing an appropriate curve according to the desired pattern using the stirring bar 13 so as to reach the desired pattern, the mixture is cured. Also, Figure 6 shows
A second embodiment according to the present invention is shown, in which the different color liquid synthetic resin composition in the first embodiment is injected or coated into two layers 12a and 12b of different colors to form a translucent casting mold for the first layer. It is obtained by stirring and mixing into the liquid synthetic resin composition 11.

Further, FIG. 7 shows a third embodiment according to the present invention, in which a liquid synthetic resin composition 14 for casting, which will become a backing layer, is injected onto the layer surface after stirring in the first and second embodiments. It is formed by simultaneously curing and molding the first layer and the second layer.

By the way, in curing and molding both layers after stirring, if additives such as a curing agent such as diacyl peroxide, an accelerator, or an ultraviolet absorber are mixed into the synthetic resin liquid for the matrix, the curing conditions are from room temperature to 80°C. Requires heating at a temperature of ℃.

Also, both layers. For example, the stirring rod used for stirring is approximately 5 mm. A square rod is used, and during the stirring operation, the tip of the rod is brought into contact with the bottom of the mold, and is occasionally floated as it travels in an appropriate curved pattern.At this time, the pattern layer (Second layer) is the part! When the surface of the main body (first layer) is injected, coated, or sprayed, stirring is performed mainly in the second layer, but is not limited to the part where the second layer is located to the part without it. If the stirring bar is continuously run over the first layer or vice versa, a more natural feeling of the real thing can be obtained. However,
When the stirring rod 13 is inserted into the layers of the liquid synthetic resin compositions 11 and 12 of the first and second layers injected into the mold 10 and moved in a pattern, the liquid synthetic resin composition for casting of the first layer is inserted. Since the resin composition 11 has a relatively high viscosity, streaks are formed in the travel trace of the stirring rod 13, and while the streaks change in flow and disappear, a second layer is formed therein.
The different-colored liquid synthetic resin composition 12 of the layer flows in and restores the original surface state of the layer, and at the same time, a stirring pattern is formed in the first layer with a thin infiltration, and the deep pattern is cured through the first layer. It is made to appear on the surface of the subsequent molded product. Next, specific examples according to the present invention will be shown below.

Specific example O: Blend example of first layer (main body) MMA syrup 1 (1) part Ca
SO4・2H20 (pure white) 15 stores? Curing agent (benzoyl peroxide) 0.5 parts Accelerator (N,
N-dimethylaniline) 0. Compounding example of Z■O second layer (pattern) MMA syrup 10α■
Carbon black w part Curing agent (benzoyl peroxide) 0.5 parts Accelerator (N,N-dimethylaniline) 0. ? (This MMA syrup or polymer-in-monomer solution can be made by either the methods described in British Patent No. 870,191 or US Pat. No. 31,546.

Specifically, the syrup can be prepared by heating a small amount of a polymerization initiator in solution in a methacrylic ester at appropriate pressure and temperature and in the presence of a chain transfer agent. can. This heating continues until the solution reaches a predetermined viscosity. Thereafter, the hot solution is quenched by adding a cold monomer containing a polymerization inhibitor. More specifically, the monomer methyl methacrylate was placed in a jacketed kettle and heated under reflux conditions at 50-150%
0.5 at 25℃ by heating at ℃
Syrup with a viscosity of ~50 poise can be prepared from methyl methacrylate. ) Place the first layer in the mold 57
Immediately, a second layer was injected onto the layer surface to a thickness of 1 Tm, and then both layers were partially stirred in a pattern using a stirring rod, and cured at 80°C for 2 hours. A molded article was obtained by curing and molding.

The molded article had a natural onyx-like pattern in which the pattern-forming colored resin appeared in a narrow meandering or fluid shape in the translucent synthetic resin, giving it a highly aesthetic appearance. Therefore, according to the above-described molding means according to the present invention, since the different-colored liquid synthetic resin composition is stirred and mixed in an appropriate pattern in the translucent liquid synthetic resin composition layer, molding is possible. The formation of time patterns can be done easily and easily in a very short time, and the appearance of the pattern appearing on the surface of the molded object can be similar to that of natural stone with depth. It has excellent functionality and effect, both in terms of functionality and realism.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the patterned synthetic resin according to the present invention, Figs. 2 to 5 are explanatory diagrams showing the first embodiment of the molding means, and Fig. 6 is also an explanatory diagram showing the second embodiment. An explanatory diagram showing
FIG. 7 is also an explanatory diagram showing the third embodiment. 1... Molded object, a... Pattern, 10... Molding mold, 1
1... Translucent liquid synthetic resin composition for casting, 12...
Different color liquid synthetic resin composition, 13... Stirring bar.

Claims (1)

[Claims] 1. When curing and molding a liquid synthetic resin composition using a mold, the main translucent liquid synthetic resin composition is injected into the mold, and then a unique liquid synthetic resin composition that forms a pattern on the layer surface is poured into the mold. 1. A method for molding a patterned synthetic resin, which comprises injecting, coating or scattering the resin, and stirring the two so that the pattern partially reaches the depth of at least a part of the main body.