JPH0327004B2 - - 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 of the present invention 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 master mold made of wood or plaster. On the upper surface of the master mold 1, a mold part 2 having a shape almost similar to a part of the external shape of the cold-curing resin product is formed, and a truncated conical mold part 2 is formed. An 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 resins such as polyethylene, polypropylene, polystyrene, vinyl chloride, vinylidene chloride, polyamide, polycarbonate, ionomer, and ethylene/vinyl acetate copolymer. , ethylene/vinyl acetate copolymer,
Some are made of rubber such as styrene-butadiene copolymer, polyolefin block polymer, butyl rubber, and natural rubber. These materials are dyed or coated with pigments, dyes, ultraviolet absorbers, etc., or laminated with metal foil, etc., and used as the molding film 9, which is then directly attached to the molded product to form a molded product. can be colored. Alternatively, a textured pattern can be imparted to a molded product by using a material with a textured pattern such as a grain pattern or a thread pattern on its surface 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. 10 is a non-porous barrier membrane made of plastic, rubber, metal,
Some are made of paper. 11 is a resin that hardens at room temperature, and includes polyurethane, polyester, acrylic, epoxy, polyamide, furan, etc. Instead of these resins, synthetic rubbers such as polyurethane, silicone, polysulfide, etc. may be used, and blowing agents may be added to these resins. It can also be made into a foamed product.
Furthermore, fillers such as calcium carbonate, talc, clay, silica, alumina, etc. may be mixed therewith. Reference numeral 12 denotes a fibrous reinforcing material roughly in the shape of a product, which is made by molding a fibrous material such as glass fiber or carbon fiber in the form of a sheet or strand chip into the roughly shape of the product.

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 shielding film 10 at the upper end of the injection port formed by the injection port model 3 are removed by fusing, and the fusing portions are joined together. Next, as shown in FIG. 3, in the same manner as the molding of the upper mold U, the lower frame body 24, the molded film 29, and the shielding film 3 are formed.
A lower mold D made of particulate matter 28 surrounded by 0 and solidified by a binder is molded, and the fiber reinforcing material 12 is set on the mold part of this lower mold D according to the shape. Upper mold U on D
The molds are matched and placed to define a product cavity having an injection port 3 and containing a fibrous reinforcing material 12 (see FIG. 3). A liquid room-temperature curing resin is injected into the thus defined product cavity from the injection port 3 under atmospheric pressure or under pressure, and after the resin has reacted and hardened, the driving of the vacuum pump (not shown) is stopped and the particulate matter 8 is removed. , 28 and then separate the upper frame 4 and the lower frame 24, the room-temperature curing resin containing the fibrous reinforcing material 12 hardens and the molded films 9, 29 adhere to the surfaces. The molded product can be taken out. By cutting and removing unnecessary parts such as the excess molding films 9 and 29 and the injection port part from this molded product, a room temperature curing resin containing the fibrous reinforcing material 12 and having a color or an uneven pattern on the surface is obtained. You can get the product. 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. The fibrous reinforcing material 12 is set in advance according to its shape, and then a predetermined amount of room-temperature curable resin 11 is injected, and then 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 assembled. The room temperature setting resin 1 may be molded into a predetermined shape by matching the molds, and in this case, the injection port 13 can be omitted, and the room temperature setting resin 1 in a high viscosity state can be omitted.
1 can also 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. Furthermore, by setting the fibrous reinforcing material in the approximate shape of the product in the mold, it has excellent effects such as easily and reliably increasing the strength of the product.

[Brief explanation of the drawing]

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: Fibrous reinforcement material, 28: Particulate material, 29: Molded film.

Claims (1)

[Claims] 1. 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 molding one of these molds. After setting the fibrous reinforcing material in the approximate shape of the product, the other mold is matched to form a product cavity containing the fibrous reinforcing material, and a liquid cold-setting resin is injected into the product cavity. After curing the room temperature curable resin, the adsorption state of the molded film on the surface of the particulate matter is released, the molds are separated from each other, and then the molded product of the room temperature curable resin to which the molded film is attached is taken out and A method for producing a room-temperature curable resin product, which comprises cutting and removing unnecessary parts from a molded product or cutting and removing unnecessary materials and peeling off the molded film. 2 Molding two or more molds by adsorbing a flexible molding film to the surface of particulate matter solidified into a predetermined shape by a binder, and molding the approximate product into one of the two or more molds. After setting the shaped fibrous reinforcing material and injecting a predetermined amount of room temperature curable resin, the other mold is inserted and the room temperature curable resin is molded into the predetermined shape, and after the room temperature curable resin is cured, After releasing the adsorption state of the molded film onto the surface of the particulate matter and separating the molds from each other, the molded product of the room temperature curing resin to which the molded film is attached is removed, and unnecessary parts are cut and removed from the molded product. A method for manufacturing a room-temperature curable resin product, which comprises cutting off or removing unnecessary materials and peeling off the molded film.