JPH0219767B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing cold-curing resin products.

Conventionally, in the production of cold-setting resin products, a mold release agent is applied to the surface of the product cavity of a mold, the mold is closed to define the product cavity, and the product cavity is injected and filled with liquid cold-setting resin. After the resin has hardened, the mold is opened, the molded product is taken out, burrs are removed from the molded product, and the molded product is colored and painted. However, with this traditional manufacturing method,
The production cost of the product is high because expensive metal molds and resin molds must be used as molds.Moreover, when coloring the molded product, the mold release agent adhering to the molded product must be washed and removed. It was necessary to roughen the surface, and coloring the molded product was troublesome. Furthermore, since room-temperature curable resin products are required to have specularity and gloss, equipment that takes these points into consideration is required, which has led to problems such as complicated processes and poor productivity.

The present invention was made to solve the above-mentioned problems.The purpose of the present invention is to have a room-temperature curable property that can be molded using inexpensive wooden molds or plaster molds, and that makes it easy to color and gloss the molded product. The purpose is to provide a method for manufacturing resin products. Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Reference numeral 1 denotes a wooden or plaster-shaped master mold, and on the upper surface of the master mold 1, a mold part 2 having a shape almost similar to a part of the outer diameter of the room-temperature curing resin product is formed. A shaped injection port model 3 is erected. Reference numeral 4 denotes a frame body, and a hollow chamber 5 is formed within the constituent members of the frame body 4, and the hollow chamber 5 is connected via a ventilation pipe 6 to a vacuum pump (not shown). Further, the inner surface of the frame body 4 is communicated with the hollow chamber 5 through a plurality of vent holes 7, 7. Reference numeral 8 denotes a particulate material such as metal powder, glass powder, sand, etc. containing a binder, and the necessary property of this particulate material 8 is that it has good filling properties. Further, the particle size of the particulate material may be about 10 μm to 3 mm, but care must be taken because the smoothness of the surface of the molded product is affected by the particle size. If the particle size is small, the smoothness of the surface of the molded product and the transferability of fine uneven patterns are improved, but the particulate matter 8 becomes difficult to handle and generates dust, which worsens the environment. On the other hand, the opposite phenomenon will occur with coarse particles, and generally particles with a diameter of about 50 to 600 μm are preferable. Further, as the binder, a furan resin to which a curing catalyst is added in advance, a urethane resin that is hardened by amine gas, and sodium silicate that is hardened by carbon dioxide gas can be used. 9 is a flexible but non-porous molded membrane made of synthetic resin such as polyethylene, polypropylene, polystyrene, vinyl chloride, vinylidene chloride, polyamide, polycarbonate, ionomer, ethylene/vinyl acetate copolymer, etc. and ethylene/vinyl acetate copolymer,
Some are made of rubber such as styrene-butadiene copolymer, polyolefin book polymer, butyl rubber, and natural rubber. These materials are coated with coloring agents such as pigments, dyes, and metal foils, or coated with ultraviolet absorbers, and then used as the molding film 9 and then directly attached to the molded product. It is possible to color the molded product. Alternatively, a textured pattern such as a grain pattern or a thread pattern can be applied to the surface of the molded product by using it as the molding film 9 and then directly adhering it to the molded product. In this case, the excess portion of the molded film 9 may be cut and removed, but if the adhesiveness between the molded product and the molded film 9 is poor, treatment such as applying an adhesive to the molded film 9 in advance is required. Reference numeral 10 denotes a non-breathable shielding membrane, which may be made of plastic, rubber, metal, or paper. Reference numeral 11 is a cold-setting resin, which includes polyurethane, polyester, acrylic, epoxy, polyamide, furan, etc. Instead of these resins, synthetic rubber such as polyurethane, silicone, polysulfide, etc. may be used. Moreover, a foaming product can be made by adding a foaming agent to these products. In addition, calcium carbonate, talc, clay,
It may also be a mixture of fillers such as silica and alumina, reinforcing materials such as glass fibers, carbon fibers, ceramic whiskers, and metal whiskers.

Next, a method for manufacturing a room temperature curable resin product will be explained. The upper frame 4 is placed on the upper surface of the master mold 1, and particulate matter 8 containing a binder is charged into the space defined by the master mold 1 and the upper frame 4. Next, when the particulate matter 8 contains a furan resin, the particulate matter 8 is solidified by natural curing of the resin, and when the particulate matter 8 contains a urethane resin and sodium silicate. If necessary, amine gas and carbon dioxide gas are passed through to harden the urethane resin and sodium silicate, thereby solidifying the substance 8 (see FIG. 1). After the particulate matter 8 has hardened, the upper frame 4 is separated and lifted from the master mold 1 to extract the hardened particulate matter 8 from the mold part 2, and then the upper frame 4 is removed by driving a vacuum pump (not shown). The inside of the hollow chamber 5 is depressurized by suction to apply suction to the surface of the particulate matter 8 of the upper frame 4. Next, a shielding film 10 is attached to the upper surface of the upper frame 4 and the upper surface of the particulate matter 8, and then a molded film 9 made of thermoplastic synthetic resin softened by heating is applied to the lower surface of the upper frame 4 and the particulate matter 8. Attach it to the bottom surface of 8. Thereby, an upper mold U for molding the room temperature curable resin into a molded product can be obtained. Note that the molded film 9 and the shielding film 10 at the upper end of the injection port model 3 are removed by fusing, and their fusing parts are joined together. Next, as shown in FIG. 3, in the same manner as in the molding of the upper mold U, a mold made of particulate matter 28 surrounded by the lower frame 24, the molding film 29 and the shielding film 30 and solidified by the binder. A lower mold D is molded, and an upper mold U is placed on top of this lower mold D.
The molds are matched and placed to define a product cavity 12 having an injection port 3 (see FIG. 3). A liquid room temperature curing resin is injected into the thus defined product cavity 12 from the injection port 3 under atmospheric pressure or under pressure. After the resin has hardened, the drive of the vacuum pump (not shown) is stopped and the particulate matter 8, After stopping the suction action on 28, if the upper frame body 4 and the lower frame body 24 are separated, the molded product with the room temperature curing resin hardened and the molded films 9 and 29 attached to the surface can be taken out. . By cutting and removing unnecessary parts such as the excess molded films 9 and 29 and the injection port portion from this molded product, a room-temperature curable resin product having a colored or uneven pattern on the surface can be obtained. Thereafter, the molded films 9 and 29 are repeatedly adsorbed onto the particulate matter 8 and 28 solidified by the binder to form upper and lower molds U and D.
By molding, room temperature curable resin products can be manufactured.

If color or pattern is not required on the surface of the product, use an untreated molded film and peel the molded film from the molded product, and if necessary, apply a coating to the surface of the molded films 9, 29 in advance. Apply mold release agent. In addition, in the above embodiment, the lower mold D
After the upper mold U is placed on top to define the product cavity 12, the room-temperature curing resin 11 is injected into the recess of the lower mold D, as shown in FIGS. 4 and 5. After injecting a predetermined amount of the room-temperature curable resin 11, the convex part of the upper mold U is inserted into the recess of the lower mold D, and both molds U and D are matched, thereby molding the room-temperature curable resin into a predetermined shape. In this case, the injection port 13 can be omitted, and even a high-viscosity room-temperature curing resin 12 can be used.

The molded films 9 and 29 in the present invention are absolutely necessary in order to prevent the cold-curing resin 11 from being inserted into the particulate matter 8 and 28.

As is clear from the above description, the present invention is capable of forming a mold by adsorbing a molding film onto the surface of particulate matter solidified into a predetermined shape by a binder, and therefore does not require expensive metal molds or resin molds. Even if you do not use a molding mold, you can accurately mold the mold using an inexpensive wooden mold or plaster mold, and by using a molding film that is colored or has an uneven pattern, it is possible to color or pattern the product. In addition, the resulting product has excellent weather resistance, and by peeling off the molded film from the molded product at the end of the manufacturing process, it is easy to create a product with specular and glossy properties. It has excellent effects such as:

[Brief explanation of drawings]

1 to 3 are longitudinal cross-sectional views of main parts of one embodiment of the present invention, and FIGS. 4 and 5 are longitudinal cross-sectional views of main parts of other embodiments. 8: Particulate matter, 9: Molded film, 11: Room temperature curable resin, 12: Product cavity, 28: Particulate material, 29: Molded film.

Claims (1)

[Claims] 1. A flexible molding film is adsorbed onto the surface of particulate matter solidified into a predetermined shape by a binder, two or more molds are molded, and these molds are matched. After defining a product cavity, a liquid room temperature curable resin is injected into the product cavity, and after the room temperature curable resin is cured, the adsorption state of the molded film to the surface of the particulate matter is released, and the molds are bonded to each other. of the room-temperature-curing resin product, which is characterized in that after separating the molded products from each other, the molded product of the room-temperature-curable resin to which the molded film is attached is taken out, and unnecessary parts are cut and removed from the molded product, or the molded film is peeled off. Production method. 2 Molding two or more molds by adsorbing a flexible molding film onto the surface of particulate matter solidified into a predetermined shape by a binder, and depositing a predetermined amount into one of the two or more molds. After injecting the room temperature curable resin, the other mold is inserted and the room temperature curable resin is molded into a predetermined shape, and after the room temperature curable resin is cured, the molded film is adsorbed onto the surface of the particulate matter. After releasing the condition and separating the molds from each other, the molded product made of a cold-setting resin to which the molded film is attached is taken out, and unnecessary parts are cut and removed from the molded product or the molded film is peeled off. A method of manufacturing a room-temperature curable resin product.