JPH0327005B2 - - 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 reaction hardening of the resin, open the mold and take out the molded product,
This method involved removing burrs from the molded product and painting it with color. However, this conventional manufacturing method requires the use of expensive metal molds and resin molds, which increases the production cost of the product.
Furthermore, when coloring a molded product, it is necessary to wash and remove the mold release agent adhering to the molded product and to roughen the surface of the molded product, making it troublesome to color the molded product. In addition, for room temperature curable resin products,
Since specularity and glossiness are required, equipment that takes this point 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 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, with a mold part 2 having a shape almost the same as a part of the external shape of the room-temperature curing resin product, a resin injection port model 15 for molding the resin injection port, and air in the product cavity on the top surface. Exhaust hole models 16 are respectively formed to form exhaust holes for discharging the air (see FIG. 1), and a hollow chamber 3 is provided in the lower part (see FIG. 2). The upper surface of the master mold 1 is connected to the hollow chamber 3 through the suction holes 4, 4.
The hollow chamber 3 is connected via a ventilation pipe 5 to a vacuum pump (not shown).

Reference numeral 7 denotes a frame body, and a hollow chamber 8 is formed in the side wall of the frame body 7 and is connected to a vacuum pump (not shown). The inner space of the frame body 7 is made to allow only air to pass through by means of a wire mesh 17 attached to the inner surface of the frame body 7, and has a large number of intake holes 18, 18 transparently provided on the inner surface of the frame body 7, and Wire mesh wrapped around the body surface 1
Small holes 2 through which only air can pass through 9 and 19
A plurality of intake pipes 21, 21 are provided through the body of the frame 7, and both ends of the intake pipes 21, 21 are fixed to the side wall of the frame 7 in communication with the hollow chamber 8 (see Fig. 2). reference).

9 is a flexible but non-permeable molded film that can be used to synthesize polyethylene, polypropylene, polystyrene, vinyl chloride, vinylidene chloride, ABS resin, polyamide, acrylic resin, polycarbonate, ionomer, ethylene/vinyl acetate copolymer, etc. There are those made of resin and those made of rubber such as ethylene/vinyl acetate copolymer, styrene/butadiene copolymer, butyl rubber, and natural rubber.

Then, 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 the molded product. can be rendered substantially 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 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. Particulate matter 11 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 properties of this particulate material 11 are that it has good filling properties, and furthermore, when the room temperature curable 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, with coarse particles, the opposite phenomenon will occur.
Generally, the particle size is about 50 to 600μ. Room temperature curable resins include polyurethane, polyester, acrylic, epoxy, polyamide, furan, etc. Instead of these resins, polyurethane,
Synthetic rubber such as silicone or polysulfide may also be used. Further, foamed products can be made by adding a foaming agent to these products. Furthermore, fillers such as calcium carbonate, talc, clay, and 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 depressurized by suction, and suction is applied to the upper surface of the master mold 1 including the surfaces of the mold part 2, the resin injection port model 15, and the exhaust hole model 16. Molded film 9 made of thermoplastic synthetic resin softened by heating
When the molded film 9 is placed on the upper surface of the master mold 1, the molded film 9 is suctioned and stretched to the upper surface of the master mold 1.

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 1 and the frame 7 are vibrated in the space formed by the frame 7 and the molding film 9. The particulate matter 11 is charged and filled, and then the frame body 7 and the particulate matter 11 are covered with the shielding film 10 to shield the upper end opening of the frame body 7. Next, a vacuum pump (not shown) is driven to suck the space formed by the frame 7, the molded film 9, and the shielding film 10 and containing the particulate matter 11 through the intake holes 18, 18 and the intake pipes 21, 21. When the pressure is reduced, the particulate matter 11 is solidified by the action of atmospheric pressure. Next, the suction action on the upper surface of the master mold 1 is stopped by stopping the drive of the vacuum pump (not shown).
The adsorption state of the molding film 9 on the upper surface of the master mold 1 is released, and then the frame body 7 holding the solidified particulate matter 11 is separated from the master mold 1 and raised, whereby the room temperature curable resin is released. It is possible to obtain an upper mold U for molding into a molded product.

Next, in the same manner as the molding of the upper mold U, the frame body 27,
A lower mold D in which particulate matter 31 surrounded by a molding film 29 and a shielding film 30 is solidified and held.
is molded, and the upper mold U is molded and placed on the lower mold D to define a product cavity having a resin injection port 51 on the mold matching surface, and then the upper and lower molds U and D are molded.
After clamping with an appropriate clamping device, 90
degree to move the resin injection port 51 upward.

A liquid room-temperature curable resin is injected into the thus defined product cavity from the resin injection port 51 under atmospheric pressure or pressurization, and after the resin has hardened, the drive of the vacuum pump (not shown) is stopped and the frame 7, After stopping the suction into the frame 7, 27, the shielding films 10, 30 are removed and the particulate matter 11, 27 is removed from the frame 7, 27.
31 is discharged and then the frame 7 is separated from the frame 27 and lifted up, the molded product having the room temperature curing resin cured and the molded films 9 and 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, an untreated molding film is used, and if necessary, the surface of the molding films 9 and 29 is coated to peel the molding film from the molded product. Apply a mold release agent in advance. In addition, as shown in Fig. 4, the lower mold D
A fibrous reinforcing material made by molding a fibrous material such as glass fiber or carbon fiber in the form of plain weave or strand chips into the general shape of the manufacturing process is set in the recess of The upper and lower molds U and D are inserted into the recess and placed on the molds to define a product cavity that has a resin injection port 51 on the molding surface and contains a fibrous reinforcing material, and then the upper and lower molds U and D are placed. , D may be rotated by 90 degrees to move the resin injection port 51 upward to inject the room temperature curable resin. In addition, the intake holes 18, 18 and the intake pipe 2
Either one of 1 and 21 may be omitted.
Furthermore, the matched upper and lower molds U and D are not rotated 90 degrees, but the position of the resin injection port 51 is left as is, and the room temperature curable resin is poured from the resin injection port 51 under atmospheric pressure into an L-shaped shape. The injection may be carried out under pressure via an injection tube (not shown) or via a suitable injection tube.

As is clear from the above description, the present invention is capable of molding a mold by 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. Moreover, since the room-temperature curing resin is injected from the resin injection ports formed on the molding surfaces of the upper and lower molds, it is possible to use inexpensive wooden molds or plaster molds without using expensive metal molds or resin molds. The mold can be formed accurately, and by using a molding film that is colored or has an uneven pattern, it is easy to color or pattern the product, and it is also possible to use reinforcing materials. The resulting product is highly durable, and by peeling off the molded film from the molded product at the end of the manufacturing process, it is easy to create products with specularity and gloss. Furthermore, since the mold has a resin injection port molded on the mold mating surface, it has excellent effects such as extremely easy molding.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a master mold used in the present invention, Figs. 2 and 3 are longitudinal cross-sectional views of main parts of one embodiment of the present invention, and Fig. 4 is a longitudinal cross-sectional view of main parts of another embodiment. It is. 1: Master mold, 2: Mold part, 7: Frame, 9: Molding film, 10: Shielding film, 11: Particulate matter, 14:
Product cavity, 15: Resin injection port model, 27...
Frame body, 29: Molding film, 30: Shielding film, 31: Particulate matter, 51: Resin injection port.

Claims (1)

[Claims] 1. A molded film is adsorbed to the upper surface of a master mold having a mold part and a resin injection port model on the upper surface, and then a frame body equipped with an air intake mechanism is placed on the upper surface of the master mold,
After filling a 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 particulate matter is solidified by applying the molding film to the upper surface of the master mold. After releasing the suction state, the frame is separated from the master mold to form a mold, and the mold is matched with a separately molded mold to form a product cavity and a resin injection port located on the mold matching surface. A room-temperature-curing resin molded product, in which a room-temperature-curing resin is injected into the product cavity from the resin injection port, reaction-cured, and then the solidified state of the particulate matter is released and the molded film is attached. A method for producing a room-temperature curable resin product, which comprises taking out the 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. 2. After adsorbing a molding film to the upper surface of a master mold having a mold part and a resin injection port model on the upper surface, a frame body equipped with an air intake mechanism is placed on the upper surface of the master mold,
After filling a 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 particulate matter is solidified by applying the molding film to the upper surface of the master mold. After the suction state is released, the frame is separated from the master mold and a mold is formed, and after setting the fibrous reinforcing material in the general shape of the product into one of the mold and the separately molded mold, the other mold is separated. Inserting the molds and aligning the molds to define a product cavity containing a fibrous reinforcing material and a resin injection port located on the mold matching surface, and injecting a room-temperature curable resin into the product cavity from the resin injection port,
After reaction curing of the resin, the solidified state of the particulate matter is released, the molded product of the room temperature curable resin to which the molded film is attached is taken out, and unnecessary materials are cut and removed from the molded product, or the unnecessary materials are cut and removed. A method for producing a room-temperature curable resin product, which comprises peeling off the molded film at the same time.