JPS58184807A - Manufacture of parabola antenna board - Google Patents

Abstract

PURPOSE:To obtain an inexpensive parabola antenna with high performance, by using an antenna reflecting plate and an insert in forming an antenna main body, forming the main body and the reflecting plate incorporatedly at the same time. CONSTITUTION:A gel coat resin is coated and cured on the surface of an MMD (metal-matched die) forming metallic mold with spraying, brushing or a lancet to form a gel coat layer 1. A carbon fiber 2 is placed on the layer 1, an MMD compound 3 is impregnated to perform compressed forming to form the reflecting plate 4 formed preliminarily. The plate 4 is taken as an insert and placed on an SMC (sheet molding compound) forming metallic mold 5, and an SMC7 is placed further and a metallic mold 6 is tightened. Thus, through the so-called compressed forming, a product 8 having the sectional construction of the parabola antenna is manufactured.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a parabolic antenna plate.

In recent years, carbon fiber reinforced plastics (hereinafter referred to as C', F, R, and P) have been commonly used as constituent materials for parabolic antennas, and are known for their excellent radio wave reflection properties, corrosion resistance, light weight, and high rigidity. It is becoming increasingly popular because it has an extremely low coefficient of thermal expansion.

However, since carbon fiber, which is the reinforcing material for C, F, R, and P, is very expensive, how can it be used?
The challenge was how to provide c, F, R, and P economically and without impairing their original characteristics. Conventional C, F, R, P
The mainstream manufacturing method was the so-called hand lay-up method, in which carbon fiber mats or crosses were laminated, but there were limits to productivity.
It has drawbacks such as difficulty in producing uniform products and inability to reduce costs. On the other hand, compression molding, injection molding, etc. are available for the purpose of improving productivity, but in this case, there are problems with durability, weather resistance, etc., since there is no surface protective layer, so-called gel coat layer.

This invention was made in view of the above situation, and its purpose is to improve the material composition of F: R and P (molding method)
By applying a wide range of characteristics, the reflector part of the antenna can be made of materials whose primary purpose is to reflect radio waves, such as C,
The main body is pre-molded with F, R, and P, and the main body is made of a material composition whose primary purpose is economy considering strength and rigidity, such as sheet molding compound (hereinafter referred to as S, M,
(referred to as C), when molding the main body part, by molding the main body using the reflector part as an insert, and molding the reflector part and the main body part integrally at the same time,
The objective is to provide an inexpensive, economical, and high-performance parabolic antenna.

That is, the feature of this invention is that first, the reflector part, which is an essential component of a parabolic antenna, is made of carbon fiber using a gel coat layered metal matte die (hereinafter referred to as M, M, D) molding method. C as reinforcement material,
F, R, and P are preformed, and these C, F, R, and P are used as a kind of insert, and bank-up reinforcement is performed using the usual S, M, and C molding method, and then integrally molded.

The molding methods called M, M, and D methods are composed of a liquid resin, a filler, and a hardening agent, and additives such as a toner and an accelerator are used as necessary, and the liquid resin is an unsaturated polyester resin. , a thermosetting resin such as an epoxy resin, the filler being 1, (1) an inorganic filler such as calcium carbonate or clay, an organic filler such as cellulose powder or plastic powder, and a peroxide as the hardening agent. There are various types such as amine-based, amine-based, acid anhydride-based, etc.The compound consisting of the above composition is injected onto the reinforcing material such as carbon fiber or glass fiber installed in the lower part of the mold, and the product is made by compression molding. This method is characterized by the fact that it uses liquid resin.
Excellent impregnation with reinforcing material and low pressure (10kg/cd)
In addition, the compound has good fluidity, so the reinforcing effect is not impaired.

In this invention, the purpose of molding by the M, M, and D methods is that the gel coat layer can be easily provided due to the above characteristics. The gel coat layer here refers to a surface protective layer of F, R, and P that is provided in areas where weather resistance, durability, heat resistance, abrasion resistance, and even aesthetics are required, and is an unsaturated resin layer. Thermosetting resins such as polyester resins and epoxy resins, peroxide-based, amine-based, acid anhydride-based curing agents, and fillers.
1 Consists of inorganic fillers such as calcium carbonate and clay, organic fillers such as cellulose powder and plastic powder, and additives such as toners and accelerators as required.

Furthermore, in this invention, the purpose of using the S, M, C molding method is that S, M, and C materials are generally molded by compression molding, so productivity is high (and the glass fiber content is high, so reinforcement is possible). It is highly effective as a bank-up material, and has good dimensional stability due to the addition of a low shrinkage agent.
This is also because the cost is low. S, M here
, C is a sheet-like molding material, which is usually made by impregnating mat-like glass fibers with a chemically thickened tree manure mixture having an unsaturated polyester resin base.
It consists of resin, filler, curing agent, mold release agent, coloring agent, and binder.

To further explain the C, F, R, and P molded product composed of the above in detail with reference to drawings, Figure 1 shows the cross-sectional structure of the reflector part of the parabolic antenna, where l is the gel coat layer. Yes, M, M.

Apply gel coat resin to the surface of the mold for D molding with a spray, brush, spatula, etc., harden it, place carbon fiber 2 on top, inject compound 3 for M, M, and D, and perform compression molding. . The reflector part 4 preformed above is installed as an insert on the S, M, C mold 5, and then the S, M.

By placing C7 and tightening the mold 6, so-called compression molding, a product having the cross-sectional structure of a parabolic antenna as shown in 8 is produced.

Next, this invention will be explained in more detail with reference to Examples and Comparative Examples.

Example 1 A gel coat resin consisting of 100 parts of unsaturated polyester resin Polymer 8413P (gel coat resin manufactured by Narita Pharmaceutical Co., Ltd.) and 1 part of Vermec N (manufactured by NOF) a methyl ethyl ketone peroxide hardener was used for M, M, and D molding. Spray it on the mold to a thickness of 0.2,
The coating is cured. On top of that, a carbon fiber surf mat-like [TRESOKA MAT BO-03
0J (manufactured by Toshi, 30 g/rrr) was installed, and Polymer 9802P (manufactured by Shikinichi Yakuhin Kogyo, M, M,
Resin for D) 100 parts, 5L-300 of calcium
A compound for M, M, and D consisting of 150 parts (manufactured by Takehara Chemical Co., Ltd.), 2 parts of benzoyl peroxide-based Lucidol B, P, and O (manufactured by Kayaku Nury Co., Ltd.), and 5 parts of pigment was injected, and the mold temperature was 120°C. Molding time 3 minutes, compression pressure 10kg/c
Compression molding is performed under the conditions of d to a thickness of 1 wa.
S, M using the reflector part molded above as an insert
, installed in the mold for C molding, and on top of this, polymer
Matsutoro 44-730 (S, M, C manufactured by Shikinichi Yakuhin Kogyo)
Stack them together and compression mold them to a total thickness of 5 cranes to integrate them. The molding conditions at that time were: mold temperature 130°C;
The molding time was 6 minutes, and the compression pressure was 30/-.

Example 2 In the same manner as in Example 1, the gel coat layer was cured, and the trading card mat BO-030 was placed on it,
Furthermore, on top of that, glass fiber pine NJe (7) MC-4
50 (B crystal'.-'FJ450 g/rrr) were stacked and M, M, and D molding was performed in the same manner as in Example 1. The thickness in this case is 2fi. Further, as in Example 1, the thickness is 5
S, M, and C molding is performed to integrate them so that fi becomes fi.

Example 3 In the same manner as in Example 1, the film of the gel coat layer was cured, and a carbon fiber cross-shaped trading card cloth 6141 (210 g/m manufactured by Toshi) was installed on it. M, M, and D molding is performed in the same manner. The thickness at this time will be 2 cranes. Thereafter, in the same manner as in Example 1, S, M, and C molding is performed to a thickness of 5 cm, and the pieces are integrated.

Comparative Example 1 The reflecting plate portion in Example 1 was molded by the hand lay-up method instead of the M, M, D method. This molded product is used as an insert, and S, M, and C molding is performed to a thickness of 5 fi in the same manner as in Example 1, and the insert is integrated.

hlJII2 ,,,, As in Examples 1 to 3, directly S without molding M, M, and D.
, M, C, set the trading card cloth "6141" in the mold, and place the "Polymer 7" and "Toro 44-73" on it.
017) Place S, M, and C, and form them to a thickness of five cranes in the same manner as in Example 1, and integrate them.

Test results for products molded from Examples 1 to 3 and Comparative Examples 1 to 2 above are shown in the following table.

Judgment ◎...(○...Good △...Possible ×...
- As is clear from the graph, the parabolic antenna manufactured by the present invention has far superior performance compared to the parabolic antenna manufactured by the conventional method.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a cross-sectional view of the reflector part of a parabolic antenna plate, FIG. 2 is an explanatory diagram of a compression molding method for the parabolic antenna plate, and FIG. 3 is a cross-sectional view of the parabolic antenna plate. It is. 1... Gel coat layer, 2... Carbon fiber, 3...
・Compound for M, M, D, 4...Reflector part,
5, 6... Mold, 7... Sheet-shaped molding material (S,
M, C), 8... Parabolic antenna board. Patent applicant Yashiguchi Kako Co., Ltd. (Figure 1, Figure 2, Figure i: 3)

Claims (1)

[Claims] The reflector portion of the parabolic antenna plate is separately F in advance. A method for manufacturing a parabolic antenna plate made of F, R, and P, characterized in that the insert and the antenna body are integrally molded by molding R and P, and inserting this to mold the antenna body. .