JPH03244204A - Reflector for parabola antenna and manufacture thereof - Google Patents

Abstract

PURPOSE:To eliminate the necessity of a painting process and to improve weather resistance by providing a weather proofing colored fiber reinforcing synthetic resin layer in the outer-most layer on a reflection surface side, providing woven fabric or nonwoven fabric composed of conductive fiber just on the downside of the weather proofing colored fiber reinforcing synthetic resin layer on the reflection surface, and providing a fiber reinforcing synthetic resin layer through (or not through) a reinforcing layer on the down side. CONSTITUTION:A weather proofing colored fiber reinforcing synthetic resin layer 2 is a sheet-shaped SMC arranged not only on the reflection surface side but also on the back side on the opposite side and a filling agent, curing agent, thickening agent and others are blended into resin for gel coat. On a lower press metal mold 6 to be vertically separately closed, an SMC forming material to be previously cut into the 80% size of a surface shape, reinforcing layer 4, woven fabric 3 composed of the conductive resin previously cut into the 100% size of the surface shape, and forming material 2 composed of setting resin, reinforcing resin, coloring agent and filling agent equipped with the satisfactory weather resistance are laminated in this order from the downside to the upside and afterwards, an upper mold 7 falls down, is pressurized and cured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a reflector for a parabolic antenna and a method for manufacturing the same.

(Prior Art) Parabolic antennas are already known. A parabolic antenna receives radio waves sent from the other party,
It is also used to send radio waves to the other party. A parabolic antenna has a structure in which a waveguide extending in the axial direction is fixed inside a reflecting mirror whose inner surface is a paraboloid of revolution, and a radiator is installed at the focal point of the paraboloid.

The performance of the parabolic antenna depends on the structure of the reflector, with a nonwoven fabric made of conductive fibers as the surface layer, and a woven or nonwoven fabric made of mineral fibers or chemical fibers interposed in the middle to serve as a reinforcing layer. Furthermore, it is known that a molding material made of short glass fibers, a curable resin, a filler, etc. is superimposed on the lower side as a back layer, and the molding material is pressed and cured integrally. Products with this structure have a woven or nonwoven fabric made of conductive fibers as a reflective material on the front side, so they have good radio wave reflection performance, but fiber-reinforced synthetic resins usually have poor weather resistance, so it is difficult to finish molding. The rear surface side is heated, and depending on the case, it may be necessary to paint the back side as well.

(Problem H to be solved by the invention) However, in the case of the above-mentioned prior art, the painting performed after the completion of molding is a separate process, and since painting is usually performed two or more times, the cost increases accordingly.

Also, instead of painting, it is possible to layer colored films and press-form them at the same time, but this is a complicated process and may cause defects such as wrinkles and blisters if you are not skilled, and the colored film itself is expensive. Therefore, there was a problem that there was no solution to the problem of increasing manufacturing costs.

The reflector for a parabolic antenna of the present invention and its manufacturing method include:
The object of this invention is to eliminate the above-mentioned drawbacks, omit the painting process, and provide a reflector for a parabolic antenna that has excellent weather resistance.

(Means for Solving the Problems) A first aspect of the present invention is that at least the outermost layer on the reflective surface side is provided with a weather-resistant colored fiber-reinforced synthetic resin layer, and the weather-resistant colored fiber-reinforced synthetic resin layer on the reflective surface side is provided with a weather-resistant colored fiber-reinforced synthetic resin layer. A parabola characterized in that a woven fabric or non-woven fabric made of conductive fibers is provided on the lower side of the scoop, and then a fiber-reinforced synthetic resin layer is provided on the lower side (with or without a reinforcing layer). The gist of the invention is a reflector for an antenna, and the second aspect of the present invention is:
At least three layers of a molding material consisting of a curable resin with excellent weather resistance, reinforcing fibers, a colorant, and a filler, a woven or nonwoven fabric made of conductive fibers, and a molding material consisting of a curable resin, reinforcing fibers, and a filler. The gist of the present invention is a method of manufacturing a reflecting mirror for a parabolic antenna, which is characterized in that it is integrally cured by stacking the mirrors in this order and applying pressure.

The weather-resistant colored fiber-reinforced synthetic resin layer in the first aspect of the present invention is manufactured from a molding material consisting of a curable resin with excellent weather resistance, reinforcing fibers, a colorant, and a filler in the second aspect of the present invention. It is something.

In general, the so-called FRP molding method involves impregnating reinforcing fibers with materials used for gel coating, which is performed for the purpose of improving the appearance of the bottom body formed by the spray amp casting method or hand lay amp molding method, and for the purpose of protecting the bottom body. It is made possible by
The resin used for gel coat is usually a resin with higher performance than the resin used for molding the main body, and has excellent thermal weather resistance. For example, in the case of unsaturated polyester resin, bisphenol resin, isophthalic acid resin, etc. etc. fall under this category. The main resin is mixed with a coloring agent, a filler such as calcium carbonate, a hardening agent such as benzoyl peroxide, and a thickener such as magnesium oxide, but in the case of the present invention, This compounding agent is impregnated into chopped strands of reinforcing fibers such as glass fibers, and SMC
It is used as a converted sheet.

Further, the glass content is preferably around 10%.

Furthermore, the thickness before curing is in the range of 0.5 to 1.5, more preferably 0.7 to 1. Thicknesses in the Owa+ range are used.

In the present invention, examples of woven or nonwoven fabrics made of conductive fibers include metal surface-treated glass fibers and carbon fiber nonwoven fabrics, and alumium-coated glass fiber nonwoven fabrics such as Lomo Glass Mant (manufactured by Landei Co., Ltd.) ), microglass aluminum coated fiber CAM70-A (manufactured by Nippon Sheet Glass Co., Ltd.), etc. is preferably pre-cut into a size that is 90 to 100% of the surface shape.

Examples of the material forming the reinforcing layer in the first aspect of the present invention include woven fabrics or nonwoven fabrics made of mineral fibers or chemical fibers, and those made of glass fibers, aramid fibers, etc. It is preferable to pre-cut the material woven or joined at 5 mm intervals to a size that is 90 to 100% of the surface shape. In addition, the second aspect of the present invention
In this case, molding materials made of a curable resin with excellent weather resistance, reinforcing fibers, colorants, and fillers, woven or nonwoven fabrics made of conductive fibers, and molding materials made of curable resins, reinforcing fibers, and fillers. It is necessary to stack at least three layers in this order, but in some cases, this reinforcing layer may be interposed under the woven or nonwoven fabric made of conductive fibers.

The fiber-reinforced synthetic resin layer in the first aspect of the present invention is
It is manufactured from a molding material consisting of a curable resin, reinforcing fibers, and a filler, and is made of glass fiber strands (10 to 40%) and unsaturated polyester resin (20 to 40%).
~40%) and fillers such as calcium carbonate (30~80%)
), a hardening agent such as benzoyl peroxide, and a thickening agent such as magnesium oxide, etc., and the SMC or BMC is thickened in the form of a sheet or block. Among these, sheet-like S with a viscosity of 100,000 to 300,000 P
MC is suitable, and the glass fiber chopped strand content is 20 to 30%, and the surface shape is 80%.
It is preferable to pre-cut to a size of ~100%.

In the first aspect of the present invention, it is necessary that at least the outermost layer on the reflective surface side is provided with a weather-resistant colored fiber-reinforced synthetic resin layer, but in some cases, the outermost layer on the back surface, that is, the opposite side to the reflective surface, Furthermore, a weather-resistant colored fiber-reinforced synthetic resin layer may also be provided around the periphery of the reflecting mirror.

(Function) In the first aspect of the present invention, a weather-resistant colored fiber-reinforced synthetic resin layer is provided at least on the outermost layer on the reflective surface side, and a conductive layer is provided below the weather-resistant colored fiber-reinforced synthetic resin layer on the reflective surface side. A woven fabric or a non-woven fabric made of fibers is provided, and then a fiber-reinforced synthetic resin layer is provided below (with or without a reinforcing layer). The synthetic resin layer works as well as or better than painted surfaces or weather-resistant colored films. In addition, the material constituting the woven fabric or non-woven fabric made of conductive fibers other than the weather-resistant colored fiber-reinforced synthetic resin layer and the reinforcing layer is a fibrous material, and the weather-resistant colored fiber-reinforced synthetic resin and the fiber-reinforced synthetic resin are also used. Since these are resins of the same type, they are highly compatible, and when they are laminated under pressure, they penetrate well into layers that do not contain resin and are cured as one piece.

The second aspect of the present invention is a molding material made of a curable resin with excellent weather resistance, reinforcing fibers, a colorant, and a filler, a woven or nonwoven fabric made of conductive fibers, and a molding made of a curable resin, reinforcing fibers, and a filler. Because it is integrally cured by stacking at least three layers of materials in this order and applying pressure,
A reflector for a parabolic antenna can be obtained without going through a painting process.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partial sectional view (of the left half) showing an example of a reflector for a parabolic antenna according to the present invention.

l is a reflector for a parabolic antenna according to the present invention,
2 is a weather-resistant colored fiber-reinforced synthetic resin layer, which is a sheet-shaped S layer disposed on the reflective surface side and on the opposite back side.
MC, a gel coat resin (Revolac RG-8264, manufactured by Showa Kobunshi Co., Ltd.) is blended with a filler, a curing agent, a thickener, etc., and is impregnated into a surface mat (5M3600E, manufactured by Asahi Fiberglass Co., Ltd.). The sheet has a thickness of approximately 0.7 mm before curing. 3 is a woven fabric made of conductive fibers, and is made of aluminum-coated glass fiber cloth. 4 is a reinforcing layer made of cheesecloth;
5 is a fiber-reinforced synthetic resin layer, which is made of sheet-like SMC (
Glass content: 25-30%, resin viscosity: 160,000 P, manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd., 113070-16).

The manufacturing method of the reflector for a parabolic antenna according to the first aspect of the present invention will be described based on FIG. A molding material 2 consisting of reinforcing fibers, a colorant, and a filler, a 3MC molding material 5 pre-cut to a size of 80% of the surface shape, a reinforcing layer 4, a conductive fiber pre-cut to a size of 100% of the surface shape. A woven fabric 3 consisting of a woven fabric 3 consisting of a curable resin with excellent weather resistance, a molding material 2 consisting of a reinforcing fiber, a coloring agent, and a filler are laminated in this order from bottom to top, and then the upper mold 7 is lowered and cured by applying pressure. Just let it happen.

(Effects) Since the reflector for a parabolic antenna according to the first aspect of the present invention is configured as described above, in terms of weather resistance, the weather-resistant colored fiber-reinforced synthetic resin layer can be applied to the painted surface or the weather-resistant colored film. It works as well as or better than. In addition, the material constituting the woven fabric or non-woven fabric made of conductive fibers other than the weather-resistant colored fiber-reinforced synthetic resin layer and the reinforcing layer is a fibrous material, and the weather-resistant colored fiber-reinforced synthetic resin and the fiber-reinforced synthetic resin are also used. Because they are resins of the same type, they are highly compatible, and because they are laminated, they can be pressurized,
When cured, it penetrates well into the layer that does not contain resin and is cured as an integral part, so it can be used to improve the quality of products, such as the abrasion resistance and impact resistance of weather-resistant colored fiber-reinforced synthetic resin layers. It is excellent.

The second method of manufacturing a reflector for a parabolic antenna of the present invention is as follows:
Since it has a soft soil structure, the painting process can be omitted and manufacturing costs are low.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of the left half of an embodiment of a reflector for a parabolic antenna according to the present invention, and FIG. 2 is a partial sectional view of the left half showing the main parts of the manufacturing process of the same. 1-Reflector for parabolic antenna according to the present invention, 2-- Weather-resistant colored fiber-reinforced synthetic resin layer, 3-- Woven fabric made of conductive fibers, 4-- Reinforcement layer, 5- Fiber-reinforced synthetic resin layer. Figure 2

Claims (1)

[Claims] 1. A weather-resistant colored fiber-reinforced synthetic resin layer is provided at least on the outermost layer on the reflective surface side, and conductive fibers are provided immediately below the weather-resistant colored fiber-reinforced synthetic resin layer on the reflective surface side. 1. A reflector for a parabolic antenna, characterized in that a woven or nonwoven fabric is provided, and a fiber-reinforced synthetic resin layer is provided below the woven fabric or non-woven fabric with (or without) a reinforcing layer interposed therebetween. 2. A molding material consisting of a curable resin with excellent weather resistance, reinforcing fibers, a colorant, and a filler, a woven fabric or nonwoven fabric consisting of conductive fibers, and a molding material consisting of a curable resin, reinforcing fibers, and a filler. A method for manufacturing a reflector for a parabolic antenna, characterized in that the layers are stacked in this order and pressurized to cure them integrally.