JPS60162608A - Preparation of resin product curing under ordinary temperature - Google Patents

Abstract

PURPOSE:To make possible molding with an inexpensive wood or plaster mold and easy to color and glaze molded articles by a method wherein the air in a space constituted by a frame, forming film and shielding film and containing granular material is absorbed to reduce the pressure and solidify the granular material. CONSTITUTION:The forming film 9 is adsorbed on the upper surface of the pattern part 2 and then the frame body 7 is mounted on the upper surface of the master die 1. The inner part of the space partitioned by the forming film 9 and the frame body 7 is charged with granular material 11 then covered with the shielding film 10 to shield the upper end opening part of the frame body 7. The air in the space containing the granular material 11 is extracted to reduce the pressure, to solidify the granular material 11. Then, the attracted state of the formed film 9 is released to separate the frame body 7 from the master die 1 and to form the mold. Two molds U, D made in this manner are mated with each other to construct a product cavity 14 and to inject resin to set under ordinary temp. from the injection port 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing cold-curing resin products. Conventionally, in the production of room temperature curable 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 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 is necessary to wash and remove the molding agent and roughen the surface of the molded product.
Painting the molded parts was difficult. In addition, since room-temperature-curing resin products require specularity and gloss, equipment that takes this into account is required, which can lead to problems such as complicated processes and poor productivity. Ta.

The present invention was made to solve the above problems.
The purpose is to enable molding using inexpensive wooden molds or plaster molds, and to explain in detail the coloring and gloss treatment of molded products based on drawings.

(1) is a wooden or plaster master mold, on the upper surface of which there is formed a mold part (2) of almost the same shape as a part of the external shape of the room-temperature curing resin product, and in the lower part there is a hollow chamber (3). 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).

Furthermore, a truncated conical injection port model (6) is erected on the upper surface of the master mold (1). (7) is a frame body, and the frame body (7) is provided with an intake mechanism that is communicatively connected to a vacuum pump (not shown). The intake mechanism includes a frame body (7
) is formed in the side wall of the frame (16) and is connected to the vacuum pump via the ventilation pipe (15), and the side wall of the frame (7) is formed with a transparent hole that penetrates from the inside to the hollow chamber (16). A large number of through holes (17) (17) are provided to communicate the hollow chamber (16) with the inner space of the frame (7), and through holes (17) (17) are installed on the inner surface of the side wall of the frame (7). ) and a wire mesh (18) through which only air can pass. (9)
is a flexible but non-porous molded membrane that can be used with polyethylene, polypropylene, polystyrene, vinyl chloride, vinylidene chloride, polyamide, polycarbonate,
Those made from synthetic resins such as ionomers and ethylene-vinyl acetate copolymers, and those made from rubbers such as ethylene-vinyl acetate copolymers, styrene-butadiene copolymers, polyolefin book polymers, butyl rubber, and natural rubber. There are things and things. Then, pigments are added to these materials.
It is possible to color a molded product by using a material containing or coating a coloring agent such as a dye or metal foil, or a material containing or coating an ultraviolet absorber as a molding film (9) and then directly adhering it to the molded product. can. 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, such as metal powder, glass powder, sand,
Inorganic particles such as other inorganic compound powders, and wood powder,
There are organic particles such as 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 is necessary to have good filling properties. It must have sufficient heat resistance. Further, the particle size of the particulate matter may be about 10 μm to 31111 μm, 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 becomes difficult to handle and generates dust, which worsens 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, such as polyurethane, polyester, acrylic, epoxy, polyamide, furan, etc. Instead of these resins, synthetic rubbers such as polyurethane, silicone, polysulfide, etc. may be used. Moreover, a foaming product can be made by adding a foaming agent to these products. Furthermore, fillers such as calcium carbonate, talc, clay, silica, alumina, and reinforcing materials such as glass fibers, carbon fibers, ceramic whiskers, and metal whiskers may be mixed therewith.

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 on the top surface of the master mold (1), the molded film (9) is suctioned and stretched and covers the top surface of the master mold (1) and the mold part (2).
) is adsorbed 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
Next, the frame (7) and the particulate matter (11) are covered with a shielding film (1) to cover the upper end opening of the frame (7).Next, a vacuum pump (not shown) is driven to remove the frame. (7),
When the space formed by the forming film (9) and the shielding film (10) and containing particulate matter (11) is sucked and depressurized through the suction mechanism, the particulate matter (11) becomes solid due to the action of atmospheric pressure. be converted into Next, by stopping the drive of the vacuum pump (not shown), the suction action on the upper surface of the mask-mold (1) and the surface of the mold part (2) is stopped, and the upper surface of the master mold (1) and the mold part of the molding film (9) are removed. (2) The adsorption state on the surface is released, and the frame body (7) that solidifies and holds the particulate matter (11) is separated from the master mold (1) and raised. An upper mold (U) for molding the 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 model (6) are removed by fusing, and their fusing parts are joined together. Next, as shown in Fig. 2, the upper mold (
A frame body (27) and a molded film (29) are formed in the same manner as in U).
and particulate matter (3o) surrounded by a shielding film (3o).
Molding a lower mold (D) in which 1) is solidified and held,
An upper mold (U) is placed on top of the lower mold (D) to define a product cavity (14) having an injection port (13).

A liquid room temperature curable resin (12) is injected into the thus defined product cavity (14) from the injection port (13) under atmospheric pressure or under pressure, and after the resin (12) is cured by reaction, a vacuum (not shown) is applied. Stop driving the pump and remove the frames (7) and (27).
) After stopping the suction action into the shielding membranes (10) and (3
0) is removed and the particulate matter (11), (31) is discharged from the frames (7), (27), and then the frame (
7) is separated from the frame body (27) and lifted up, the room temperature curing resin hardens and a molded film (9), (29) is formed on its surface.
It is possible to take out the molded product that has been adhered to. By cutting and removing unnecessary parts such as the excess molding 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.

In addition, if you do not need color or uneven patterns on the surface of the product,
An untreated molded film is used, the molded film is peeled off from the molded product, and if necessary, the molded film (9
), (29) are coated with a mold release agent. Matco,
In the above implementation, 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 in the figure and Fig. 4, after injecting a predetermined amount of room temperature curing resin (12) into the recess of the lower mold (D), insert the convex part of the upper mold (U) into the recess of the lower mold (D). The molds (U) and (D) may then be matched to mold the room-temperature curing resin into a predetermined shape. In this case, the injection port (13) can be omitted, and the high viscosity It is also possible to use a room temperature curable resin (12).

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 with an inexpensive wooden mold or plaster mold without using expensive metal molds or resin molds, and the molding film can be colored or textured. By doing so, it becomes easy to color and pattern the product, and the resulting product has excellent durability.Furthermore, the molded film can be peeled off from the molded product at the end of the manufacturing process. This provides excellent effects such as the ability to easily obtain products with specularity and gloss.

[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 (7): Frame (9): Molded film (10): Shielding film (11): Particulate matter (12)
: Room temperature curable resin (14) : Product cavity (1
6); Hollow chamber (27) : Frame (29) : Molding film (30) : Shielding film (31) :
Particulate matter patent applicant Shinto Kogyo Co., Ltd. 1

Claims (1)

[Claims] 1. A molding film is adsorbed to the upper surface of a master mold having a mold portion on the upper surface and the surface of the mold portion, and then an air intake mechanism is provided on the side wall of the upper surface of the master mold to act on the inner hollow portion thereof. After placing the frame and filling the space defined by the molded film and the frame with particulate matter, a shielding film is placed over the upper surface of the frame and the particulate matter, and the upper end of the frame is opened. The particulate matter is solidified by suctioning and depressurizing the space constituted by the frame, the molded film, and the shielding film and containing the particulate matter through the suction mechanism, and solidifies the particulate matter. After releasing the adsorption state to the upper surface of the master mold and the surface of the mold part, the frame body is separated from the master mold to mold two or more molds, and the two or more molds are molded. Together, they define a product cavity, and 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 molded film is attached to the room temperature curable resin molding. 1. A method for producing a room-temperature curable resin product, which comprises taking out a molded product and cutting and removing unnecessary materials from the molded product, or cutting and removing unnecessary materials and peeling off the molded film. 2. After adsorbing the molding 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 having a side wall equipped with an air intake mechanism that acts on the inner hollow portion 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 upper surface of the frame and the particulate matter to shield the upper end opening of the frame; The particulate matter is solidified by suctioning and reducing the pressure in the space constituted by the frame, the molding film, and the shielding film and containing the particulate matter through the suction mechanism, and the upper surface of the master mold of the molding film and the mold are After the adsorption state on the part surface is released, the frame is separated from the master mold and two or more molds are molded, and a predetermined amount is placed in one of the two or more molds. After injecting the room-temperature curable resin, the other mold is inserted into the mold and the room-temperature curable resin is formed into a predetermined shape and cured. After that, the solidified state of the particulate matter is released and the molded film is attached. A method for manufacturing a room temperature curable resin product, which comprises taking out a room temperature curable resin molded product, and cutting and removing unnecessary materials from the molded product, or cutting and removing the unnecessary materials and peeling off the molded film.