JPS6032633A - Manufacture of cold-setting resin item - Google Patents

Abstract

PURPOSE:To shape a master by an inexpensive wooden mold or gypsum mold, by filling a space defined by a frame body, a molding film and a shielding film with a particulate material and sucking to apply vacuum to shape a mold. CONSTITUTION:A molding section 2 is shaped by a master 1 of wood or gypsum, a frame body 7, a molding film 9 and a shielding film 10 constitute a space, and the space is filled with a particular material 11 and is sucked via a suction pipe 8 to cause the pressure therein to be reduced. Thus, the particulate material 11 is solidified thereby producing top force (U) and a bottom force (D). A liquid cold-setting resin 12 is injected from an injection port into a cavity 14 followed by curing, and a molded item having the molding films 9, 29 adhered on the surface is removed.

Description

[Detailed description of the invention] The present invention relates to a method for producing a room temperature curable resin product.

Conventionally, in the production of room temperature curable resin products, a 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 room temperature curable resin. After the resin has hardened, the mold is opened, the molded product is taken out, the molded product is removed, 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 difficult to paint the molded product with color. In addition, since room-temperature-curing resin products require specularity and gloss, equipment that takes this into consideration is required, resulting in problems such as complicated processes and poor productivity. .

The present invention was made in order to solve the two problems mentioned above, and its purpose is to provide a molded product with high strength, which can be molded using an inexpensive wooden mold or plaster mold, and to provide a high strength to the molded product. The object of the present invention is to provide a method for manufacturing a room temperature curable resin product that can be easily colored, glossed, etc. Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

(1) is a master mold in the form of a wooden mold or a plaster mold, and 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 on the upper surface, and a hollow chamber (3) in the lower part. is provided. And the surface of the mold part (2) has suction holes (4)
(4) to a hollow chamber (3), and the hollow chamber (3) is connected to a vacuum pump (not shown) via a ventilation pipe (5). Further, a truncated conical injection port model (6) is erected on the upper surface of the master mold (1). (7) is a frame body, and air-permeable intake pipes (8), (8) are installed in the space of the frame body (7), and the intake pipe (8) is connected to the frame body (7). ) is connected to a vacuum pump, not shown, through a hollow chamber, not shown. (
9) is a molded membrane that is flexible and has no air permeability;
Those made from synthetic resins such as polyethylene, polypropylene, polystyrene, vinyl chloride, vinylidene chloride, polyamide, polycarbonate, ionomer, ethylene/hynyl acetate copolymer, ethylene/vinyl acetate copolymer, styrene/butadiene copolymer , polyolefin book polymers, butyl rubber, natural rubber, and other rubbers. These materials contain or are coated with coloring agents such as pigments, dyes, and metal foils, and are coated with or contain ultraviolet absorbers, and then used as a molding film (9) and then directly attached to the molded product. This allows the molded product to be colored. 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 molding film (9) can be removed by cutting, but if the adhesiveness between the molded product and the molding film (9) is poor, it may be necessary to apply an adhesive to the molding film (9) in advance. Processing is required.

(10) is a non-air permeable shielding membrane, which may be made of plastic, rubber, metal, or paper. (11) is particulate matter, which includes inorganic particles such as metal powder, glass powder, sand, and other inorganic compound powders, and organic particles such as wood powder and plastic powder. The necessary property of this particulate material (11) is that it has good filling properties.Furthermore, when room-temperature curable resin generates heat during curing or requires heating to a certain extent during molding, it can be heated at these temperatures. It must have sufficient heat resistance. Further, the particle size of the particulate matter may be about 1011 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, if the particles are coarse, the opposite phenomenon will occur, and the particle size is generally about 50 to 600 μm. (12) is a room temperature curable resin, including polyurethane, polyester, acrylic, epoxy, polyamide,
In place 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,
A mixture of fillers such as clay and silica alumina may also be used. (15) is a fibrous reinforcing material in the general 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 general shape of the product.

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), and then softened by heating. When the molded film (9) made of thermoplastic synthetic resin is placed over the two sides of the master mold (1), the molded film (9) is suctioned and stretched while covering the top surface of the master mold (1) and the mold part (
2) Adsorb to the surface.

Next, the frame (7) is placed on the upper surface of the master mold (1) to which the molding film (9) has been adsorbed, and the master mold is placed in the space formed by the frame (7) and the molding film (9). (1) and frame (7)
Inject and fill the particulate matter (11) while vibrating the
Subsequently, the frame (7) and the particulate matter (11) 1 are covered with a shielding film (10) to shield the upper end opening of the frame (7). Next, a vacuum pump (not shown) is driven to remove the frame (7).
), the intake pipe (8) runs through the space that is composed of the formed film (9) and the shielding film (lO) and contains particulate matter (11).
(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 part (2) is stopped, and the molding film (9) is removed from the upper surface of the master mold (1) and the mold part (2).
2) Release the adsorption state on the surface, and then release particulate matter (11
) into a master mold (
When separated and raised from 1), an upper mold (U) for molding the cold-curing resin into a molded product can be obtained. Note that the molded film (9) and shielding film (lO) 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 FIG. 2, the particulate matter (31) surrounded by the frame (27), the molding film (29) and the shielding film (30) is molded in the same manner as in the molding of the upper mold (U). A lower mold (D) which is solidified and held is molded. This lower mold (D
) The fibrous reinforcing material (15) is set on the mold surface according to its shape, and then the upper mold (U) is placed on the lower mold (D) with the molds aligned, thereby opening the injection port (13). and a product cavity (1) having a built-in fibrous reinforcing material (15).
4) Define. The product cavity thus defined (
14) Liquid room temperature curing resin (
12) is injected under atmospheric pressure or under pressure to form a resin (12).
After curing, the drive of the vacuum pump (not shown) is stopped to stop the suction action into the frame (7) (27), and then the shielding film (10) (30) is removed and the frame (7) (
27) When the particulate matter (11) (31) is discharged from inside and then the frame (7) is separated from the frame (27) and raised, the room temperature curing resin hardens and a formed film is formed on its surface. (
9) The molded product to which (29) is attached can be taken out. Excess molded films (9) and (2) are removed from this molded product.
By cutting and removing unnecessary parts such as 9) and the injection port part, it is possible to obtain a room-temperature curing resin product which has a built-in fibrous reinforcing material (15) and has a colored or uneven pattern on its surface.

In addition, if a color or uneven pattern is not required on the surface of the product, use an untreated molded film, peel the molded film from the molded product, and use molded film (9), (29)
) Apply a mold release agent to the surface. Furthermore, in the above embodiment, the second 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 in FIGS. 3 and 4, a fibrous reinforcing material (15
) according to its shape, and then, after injecting a predetermined amount of room-temperature curing resin (12), insert the convex part of the J-shape (U) into the four parts of the D-shape (D), and then Type (U) (D)
It is also possible to mold the cold-curing resin into a predetermined shape by matching the molds, and in this case, injection Ill (13
) can be omitted, and a high viscosity room temperature curable resin (12) can also be used.

As is clear from the explanation below-1-, the present invention includes: a frame;
Particulate matter can be removed by suctioning and reducing the pressure in the space that is composed of a forming film and a shielding film and containing particulate matter.Moreover, by using a molded film that is colored or has an uneven pattern, it is possible to color the product. In addition to making it easier to apply patterns and patterns, the resulting product has excellent weatherability.-1-1 By peeling off the molded film from the molded product at the end of the second manufacturing step, specularity can be improved. , it is easy to obtain a product with gloss, and furthermore, by setting a fibrous reinforcing material in the approximate shape of the product in the mold, the strength of the product can be easily and reliably increased. play.

[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 part (8): Intake pipe (7): Frame (9): Molding film (10): Shielding film

Claims (1)

[Claims] 1. After a molding film is adsorbed to the -1- side and the surface of the mold part of a master mold having a mold part on the '- side, a frame body equipped with an intake pipe is placed on the upper surface of the master mold. After filling the space defined by the molded film and the frame with particulate matter, a shielding film is placed over the two sides of the frame and the particulate matter, and the upper opening of the frame is closed. The particulate matter is solidified by suctioning and depressurizing the space that is shielded and configured by the frame body, the molded film, and the shielding film and contains the particulate matter through the suction pipe, and the upper surface of the master mold of the molded film is After releasing the adsorption state to the surface of the mold part, the frame is separated from the master mold to form a mold, and one of the two or more molds formed by this molding process has an approximate product shape. After setting the fibrous reinforcing material, the other mold is inserted into the mold to define a product cavity containing the fibrous reinforcing material, and a room temperature curing resin is injected into the product cavity, and after the resin hardens. , the solidified state of the particulate matter is released, the room temperature curable resin molded product to which the molded film is attached is taken out, and unnecessary materials are cut and removed from the molded product or the molded film is peeled off. Method for manufacturing curable resin products. 2. After adsorbing a molded film to the upper surface of a master mold having a mold part on the upper surface and the surface of the mold part, a frame body equipped with an intake pipe is placed on the upper surface of the master mold, and the molded film body and the molded film body described in Ail are placed. After filling the formed space with particulate matter, a shielding film is placed over the upper surface of the frame and the particulate matter -1- to shield the -L end opening section of the frame, and the frame is molded. The particulate matter is solidified by suctioning and reducing the pressure in the space formed by the membrane and the shielding membrane and containing the particulate matter through the suction pipe, and the particulate matter is solidified and transferred to the upper surface of the master mold and the mold part surface of the forming film. After releasing the suction state, the frame body is separated from the master mold to form a mold, and the molded 2
A fibrous reinforcing material having an approximate product shape is set in one of the plurality of molds, and a predetermined amount of room-temperature curable resin is injected into the mold. A room temperature curable resin is formed into a predetermined shape, and after the room temperature curable resin is cured, 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. A method for producing a room-temperature curable resin product, which comprises cutting off unnecessary materials or peeling off the molded film.