JPS6090723A - Molding method of synthetic resin electric conductor - Google Patents

Abstract

PURPOSE:To prepare a conductive filament free from creases and breaks by putting a continuous strand mat as reinforcement on both the internal and the external surface of the conductive filament. CONSTITUTION:Continuous strand mats (in which a bundle of hundreds of glass filaments are arranged without being cut, non-directionally, uniformly, laminated to a specified thickness and hardened with synthetic resin adhesives) are laminated on the SMC containing 25% of glass and mats of glass filament whose surface is coated with aluminum are laminated and pressed in a concave form to mold a parabola antenna. The molded body obtained shows excellent reflection factor and is free from breaks of the mat.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for press molding a synthetic resin conductor.

Conductors made by filling synthetic resin with conductive fibers are used in electromagnetic shielding materials, heating elements, antistatic packaging materials, radio wave receiving antennas, and the like. In applications such as electromagnetic shielding materials and antennas, it is necessary to provide uniform and high conductivity, and therefore, mat-like materials of filament fibers having a diameter of approximately 10 μm are known as conductive fibers. In cases where the conductive layer is present on the surface of a concave surface, such as in a parabolic antenna, such a conductive filament mat is placed on the surface and integrally press-molded using a reverse electrical fiber-reinforced synthetic resin as a supporting material. It is possible. However, the conductive filament (S) as the surface layer has drawbacks such as being easily wrinkled and cut due to press pressure.

Conductive filaments that are wrinkled and unevenly distributed, or have cut portions, can cause electromagnetic wave leakage and have a significant impact on radio wave reception performance, and are issues that should be prevented.

The inventors of the present invention have conducted extensive research to develop a press molding method for synthetic resin conductors having conductive filament mats that does not have the drawbacks mentioned above. It was found that the problem could be solved by using a strand mat in combination. That is, the present invention provides a press-molding method for a synthetic resin conductor having a conductive filament mat in its surface layer, which is characterized in that a continuous strand mat is coexisted in the surface layer. It is related to.

Generally, it is essential that the conductive layer of the conductor exists uniformly on the surface with a thickness of about 1 m and at high density.

In particular, conductive materials such as parabolic antennas are required to have a smooth surface. Therefore, it is preferable that the diameter of the filament fibers constituting the conductive filament mat is not too large. For this reason, the filament fibers are easily cut during press molding, and countermeasures are required, but this can be effectively prevented according to the present invention. Continuous strand mat is a strand made of several hundred glass fiber filaments, which are arranged uniformly in the direction of the turn without cutting, to a predetermined thickness, e.g. 0.5 strands.
- It is a mat-like reinforcement material stacked on 4 fins and hardened with a binding agent.

By coexisting such a continuous strand mat in the inner layer or outer layer of the conductive filament mat layer, filament breakage can be prevented. In the housing material for the electric W1 lotus shield, the conductive filament mat layer does not necessarily have to be located on the outermost surface, but may be located inside the continuous strand mat layer. Usually, a supporting material layer is often provided together with these layers (and these can be integrally formed by heating and press-molding.As a supporting material, for example, unsaturated polyester resin or thickened glass chopped strand mat is used). So-called BMO, etc., which is preformed into a block by blending so-called 13M01 short fiber reinforcing material impregnated with an agent and unsaturated polyester resin, etc., is suitable, and this unsaturated polyester resin forms a continuous strand mat layer and a layer during pressing. It can be transferred to a conductive filament mat layer and integrally molded by heat curing.

The reinforcing fibers in the support material are not limited to glass fibers, but include carbon fibers, boron fibers, fused silica fibers, silica fibers,
Inorganic fibers such as alumina fibers, zirconia fibers, boron nitride fibers, silicon nitride fibers, boron carbide fibers, silicon carbide fibers, asbestos fibers, metal fibers, etc., or natural or synthetic fibers such as hemp, polyamide, polyester, etc. are used. obtain. Thermosetting resins are not limited in any way, and include unsaturated polyester resins, epoxy resins,
Phenolic resin, vinyl ester resin, silicone resin,
Polyimide resin, alkyd resin, thermosetting polyurethane resin, etc. can be used. Further, examples of the filament material of the conductive filament mat include carbon fiber, aluminum fiber, brass fiber, copper fiber, stainless steel fiber, metallized glass fiber, carbon coated glass fiber, and metallized carbon fiber.

Example 1 A parabolic antenna having a concave surface with a diameter of 800 m and a maximum depth of 100 m was press-molded. In the concave surface area, from the side farthest from the concave surface, SMO with a glass content of 25 cm, followed by continuous strand mat (unit type t4 s o f
/m') Then, a glass fiber filament mat (unit weight 801/rr?) whose surface layer of the filament was coated with aluminum was placed. The molded product after integral molding and solidification had good reflectance, and the aluminum-coated glass fiber filament mat did not have any breaks.

Example 2 A paraboloid for a parabolic antenna was obtained in the same manner as in Example 1 except that the continuous strand mat was placed on the outermost surface of the concave surface portion. As a result, the aluminum-coated glass fiber mat had only one break, and the reflectance was good.

Comparative Example A paraboloid for a parabolic antenna was obtained in the same manner as in Example I except that the continuous strand mat was not disposed. As a result, many breaks occurred in the aluminum-coated glass fiber mat, resulting in a decrease in reflectance.

Agent [Person 11] Akira Agent! Restored by Ryo Hara - Procedural amendment January 1982? υ Japan Patent Office Commissioner 1, Indication of the case, Patent Application No. 198273, filed in 1982, 2, Name of the invention, Method for molding synthetic resin conductor 3, Relationship with the person making the amendment, patent applicant address, Sagamihara, Kanagawa Prefecture 1-2-27 Miyashita, Ichi Name Dainichi Glass Industry Co., Ltd. Voluntary amendment 6. Number of inventions increased by amendment None? , Subject of the amendment Column 8 of the detailed explanation of the invention in the specification, the content of the amendment is corrected to the following statement without truncating it.

that's all

Claims (1)

[Claims] (1) In a press molding method for a synthetic resin conductor having a conductive filament mat in its surface layer, molding of a synthetic resin conductor in which a continuous strand mat coexists in the core surface layer is a characteristic feature. Law.