JPH0219766B2 - - 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, this conventional manufacturing method requires the use of expensive metal molds or resin molds, which increases the production cost of the product.Furthermore, when coloring the molded product, it removes the flakes that adhere to the molded product. It was necessary to wash and remove the molding agent and to roughen the surface of the molded product, making it troublesome to color the molded product. In addition, since room-temperature-curing resin products require specularity and gloss, equipment that takes this into consideration is required, which leads 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 master mold, on the upper surface of which a mold part 2 having a shape almost identical to a part of the external shape of the room-temperature curing resin product is formed, and a hollow chamber 3 is provided in the lower part. The surface of the mold part 2 is communicated with the hollow chamber 3 via the suction holes 4, 4.
The hollow chamber 3 is connected via a ventilation pipe 5 to a vacuum pump (not shown).

Further, on the upper surface of the master mold 1, a truncated conical injection port model 6 is erected. 7 is the frame body,
In the space of the frame body 7, there is an intake pipe 8 with ventilation.
8 is installed, and the intake pipe 8 is connected to a vacuum pump (not shown) through a hollow chamber (not shown) provided in the frame 7. 9 is a flexible but non-permeable molded membrane made of synthetic resin such as polyethylene, polypropylene, polystyrene, vinyl chloride, vinylidene chloride, polyamide, polycarbonate, ionomer, ethylene/vinyl acetate copolymer, etc. and those made of rubber such as ethylene/vinyl acetate copolymer, styrene/butadiene copolymer, polyolefin book polymer, butyl rubber, natural rubber, etc.
There is. These materials contain or are coated with coloring agents such as pigments, dyes, and metal foils, or contain or are coated with ultraviolet absorbers, and are 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 can be imparted to a molded product by using a material having 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. Reference numeral 10 denotes a non-breathable shielding membrane, which may be made of plastic, rubber, metal, or paper. 11 is particulate matter, including metal powder, glass powder,
There are inorganic particles such as sand and other inorganic compound powders, and organic particles such as wood flour and plastic powder. The necessary properties of this particulate material 11 are that it has good filling properties, and furthermore, when the room-temperature curing resin generates heat during curing or needs to be heated to a certain extent during molding, it has sufficient resistance to these temperatures. It is to have heat resistance so as to obtain. Further, the particle size of the particulate matter 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 will be improved, but the particulate matter will be difficult to handle and will generate dust, which will worsen 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. 12 is a room temperature curable resin, such as polyurethane, polyester, acrylic, epoxy,
Examples include polyamide and furan, and instead of these resins, synthetic rubbers such as polyurethane, silicone, and polysulfide 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 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. By driving a vacuum pump (not shown), the inside of the hollow chamber 3 of the master mold 1 is suctioned and depressurized to apply suction to the upper surface of the master mold 1 and the surface of the mold part 2,
Subsequently, when a molded film 9 made of a thermoplastic synthetic resin softened by heating is placed on the upper surface of the master mold 1, the molded film 9 is suctioned and stretched to be adsorbed to the upper surface of the master mold 1 and the surface of the mold part 2. Next, the formed film 9
The frame body 7 is placed on the upper surface of the master mold 1 which has been adsorbed, and in the space constituted by the frame body 7 and the molding film 9,
Particulate matter 11 is introduced and filled while vibrating master mold 1 and frame 7, and then a shielding film 10 is placed over frame 7 and particulate matter 11 to shield the upper end opening of frame 7. Next, a vacuum pump (not shown) is driven to remove the frame 7, the molded film 9, and the shielding film 1.
When the space constituted by 0 and containing particulate matter 11 is suctioned and depressurized through the intake pipes 8, 8, the particulate matter 11 is solidified by the action of atmospheric pressure. Next, by stopping the drive of the vacuum pump (not shown), the suction action on the upper surface of the master mold 1 and the surface of the mold section 2 is stopped, and the adsorption state of the molding film 9 on the upper surface of the master mold 1 and the surface of the mold section 2 is released. A frame body 7 that solidifies and holds particulate matter 11
When it is separated and lifted from the master mold 1, 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 6 are removed by fusing, and their fusing parts are joined together. Next, as shown in Figure 2,
The frame body 27 and the molded film 29 are formed in the same manner as in the molding of the upper mold U.
and particulate matter 3 surrounded by a shielding film 30
Molding a lower mold D in which 1 is solidified and held,
Place the upper mold U on top of the lower mold D,
A product cavity 14 having an inlet 13 is defined.

Liquid room-temperature curable resin 12 is injected into the product cavity 14 defined in this way from the injection port 13 under atmospheric pressure or under pressure. After the resin 12 has hardened, the drive of the vacuum pump (not shown) is stopped and the frame is 7,27
After stopping the inward suction action, the shielding membranes 10, 30
is removed and the particulate matter 11, 31 is discharged from the frames 7, 27, and then the frame 7 is replaced with the frame 2.
When separated and raised from 7, the room temperature curable resin is cured and a molded product with molded films 9, 29 attached to its surface can be taken out. By cutting and removing unnecessary portions such as the excess molded films 9 and 29 and the injection port portion from this molded product, a room-temperature curable resin product with a colored or uneven pattern on the surface can be obtained.

If the surface of the product does not require a color or uneven pattern, use an untreated molded film, peel the molded film from the molded product, and, if necessary, coat the surface of the molded films 9 and 29. Apply mold release agent. Further, in the above embodiment, the upper mold U is placed on the lower mold D to define the product cavity 14, and then the room temperature curing resin 12 is injected. As shown, after injecting a predetermined amount of room temperature curable resin 12 into the recess of the lower mold D, 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. The room temperature curable resin may be molded into a predetermined shape; in this case, the injection port 13
can be omitted, and even a room temperature curing resin 12 in a high viscosity state can be used.

As is clear from the above description, the present invention involves sucking and depressurizing the space that is composed of a frame, a molding film, and a shielding film and containing particulate matter to solidify the particulate matter to form a mold. Because of this, it is possible to accurately mold the mold using an inexpensive wooden mold or plaster mold without using expensive metal molds or resin molds, and the molding film is colored or has an uneven pattern. This not only makes it easier to color and add patterns to the product, but the resulting product also has excellent weather resistance.Furthermore, the molded film can be peeled off from the molded product at the end of the manufacturing process. By doing so, excellent effects such as the ability to easily obtain a product with specularity and glossiness are produced.

[Brief explanation of drawings]

1 and 2 are longitudinal cross-sectional views of main parts of one embodiment of the present invention, and FIGS. 3 and 4 are longitudinal cross-sectional views of main parts of other embodiments. 1: Master mold, 2: Mold section, 8: Intake pipe, 7:
Frame, 9: Molded film, 10: Shielding film, 11: Particulate matter, 12: Room temperature curable resin, 14: Product cavity, 27: Frame, 29: Molded film, 30: Shielding film, 31: Particulate material.

Claims (1)

[Claims] 1. After a molded film is adsorbed onto the upper surface of a master mold having a mold portion on the upper surface and the surface of the mold portion, a frame body equipped with an intake pipe is placed on the upper surface of the master mold, and the molded film and the molded film are adsorbed onto the upper surface of the master mold. After filling the space defined by the frame with particulate matter, a shielding film is placed over the upper surface of the frame and the particulate matter to shield the upper end opening of the frame, and the frame and the molded film are and a space formed by a shielding film and containing the particulate matter is vacuumed and depressurized through the suction pipe to solidify the particulate matter, and the forming film is adsorbed onto the upper surface of the master mold and the surface of the mold part. After releasing the condition, the frame body is separated from the master mold to mold two or more molds, and the two or more molds are brought together to define a product cavity. After injecting a room temperature curable resin into the product cavity and curing it at room temperature, the solidified state of the particulate matter is released and the room temperature curable resin molded product to which the molded film is attached is taken out, and unnecessary materials are removed from the molded product. A method for producing a room temperature curable resin product, which comprises cutting and removing or peeling off the molded film. 2. After adsorbing a molded film to the upper surface of a master mold having a mold portion on the upper surface and the surface of the mold portion, a frame body equipped with an intake pipe is placed on the upper surface of the master mold, and the molded film and the frame form a defined area. After the particulate matter is filled in the space where the particulate matter is formed, a shielding film is placed over the upper surface of the frame body and the particulate matter to shield the upper end opening of the frame body, and the particulate matter is formed by the frame body, the molded film, and the shielding film. The space containing the particulate matter is suctioned and depressurized through the suction pipe to solidify the particulate matter, and after releasing the adsorption state of the molded film to the upper surface of the master mold and the surface of the mold part, Two or more molds are molded by separating the frame from the master mold and molding the mold, and after injecting a predetermined amount of room-temperature curable resin into one of the two or more molds, the other mold is injected into the other mold. After inserting the mold and aligning the room temperature curable resin into a predetermined shape and curing it, the solidified state of the particulate matter is released and the molded product of the room temperature curable resin to which the molded film is attached is taken out. A method for producing a room-temperature curable resin product, which comprises cutting and removing unnecessary materials from a molded product or peeling off the molded film.