JPH03151217A - Parabolic antenna reflector and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a parabolic antenna reflector and a method for manufacturing the same.

TECHNICAL BACKGROUND OF THE INVENTION Conventionally, parabolic antenna reflectors have been manufactured by applying anti-corrosion coating to a metal plate or by press-molding anti-corrosion metal.

1. However, if you manufacture a parabolic antenna reflector using this method, the manufacturing cost will be high.
Alternatively, after forming a parabolic antenna reflector having a predetermined shape,
There is a problem in that so-called springback occurs in this reflector, the surface precision of the parabolic antenna reflector decreases, and the radio wave reflection performance decreases.

By the way, as a method of manufacturing a parabolic antenna reflector, there is a method of manufacturing by press molding using a conductive nonwoven fabric and a fiber-reinforced unsaturated polyester sheet (sheet molding compound, SMC), but this method requires a long cycle. (ie, there are many manufacturing steps), and the resulting reflector requires finishing and surface coating.

In addition, a press-molded product made of metal foil and glass fiber-reinforced olefin resin sheet has been proposed as a parabolic antenna reflector, but this molded product has poor surface properties such as poor surface smoothness. There was also the problem of low accuracy.

By the way, in the method of manufacturing a parabolic antenna reflector described in JP-A-81-161004 and JP-A-61-161003, the metal layer and the inorganic filler-containing resin protective layer or inorganic filler-containing resin protective layer or inorganic In order to prevent delamination between the filler-containing olefin polymer layer and the inorganic filler-containing resin protective layer, a large amount of filler must be used when forming the inorganic filler-containing resin protective layer, which causes the appearance of the parabolic antenna reflector to deteriorate. In addition, there were problems in that the interlayer adhesion strength was insufficient. In addition, after molding, the antenna reflector is deformed, making it difficult to increase the surface area, and furthermore, there are problems in that there are large sink marks at the boss attachment portion of the reflecting surface.

In addition, there is also the problem that the filler used in such a large amount causes wear of the screw or cylinder of the molding machine and has a negative effect on the life of the mold.

Purpose of the Invention The present invention aims to solve the problems associated with the prior art as described above. It has particularly excellent adhesive strength, does not cause delamination due to expansion and contraction due to heat cycles after molding, and the resulting parabolic antenna reflector has excellent surface precision.
Therefore, parabolic antenna reflectors that do not cause uneven radio wave reflection, have excellent corrosion resistance, can maintain good radio wave reflection ability over a long period of time, and can be manufactured using a simple manufacturing process. The purpose is to provide a manufacturing method.

Summary of the Invention The parabolic antenna reflector according to the present invention includes a resin protective layer,
It is characterized in that a metal layer and a layer made of a composition comprising a polyamide and a polyolefin or a modified polyolefin (hereinafter both simply referred to as polyolefin) are laminated in this order.

In addition, the method for manufacturing a parabolic antenna reflector according to the present invention involves laminating a thermoplastic resin film or sheet with a metal, or coating a metal with a resin to form a laminate, and then, if necessary, coating the other metal. The surface is subjected to surface treatment such as primer treatment or plasma treatment, or is laminated with a resin film for adhesion, and the resin protective layer of the resulting laminate is in contact with the inner surface of the injection mold, and the metal The two-layer laminate is placed in a mold so that a gap is formed between the layer and the mold, and then a nozzle provided in the mold enters the mold, and the polyamide and polyolefin are introduced into the mold. The method is characterized in that a layer of a composition containing polyamide and polyolefin is formed on the metal layer by injecting the composition.

In the parabolic antenna reflector according to the present invention, a resin protective layer with excellent weather resistance is laminated on one side of the metal layer that reflects radio waves as described above, and the resin protective layer with excellent weather resistance is laminated on the other side of the metal layer. Since the layers made of the composition containing polyamide and polyolefin are laminated, there is no interlayer adhesion between the metal layer constituting the parabolic antenna reflector and the layer made of the composition containing polyamide and polyolefin. It has particularly excellent strength, and does not cause interlayer peeling due to expansion and contraction of each layer due to heat cycles after molding. Furthermore, the barabo antenna reflector according to the present invention has excellent surface area, therefore does not cause uneven radio wave reflection, has excellent corrosion resistance, and can maintain radio wave reflecting ability well for a long period of time. Moreover, it can be manufactured through a simple process.

DETAILED DESCRIPTION OF THE INVENTION Next, the parabolic antenna reflector according to the present invention will be specifically described.

The parabolic antenna reflector according to the present invention includes, for example, the first
As shown in the figure, it is composed of a laminate in which a resin protective layer 2, a metal layer 3, and a layer (referred to as composition layer) 4 made of a composition containing polyamide and polyolefin are laminated in this order. There is.

In the parabolic antenna reflector 1 according to the present invention, the thickness of the resin protective layer is usually 5 pm = 5 mm, preferably 10 μm = lIB.

If the thickness of the resin protective layer is less than 5 .mu.m, the metal layer is likely to be corroded, and if it exceeds 5 .mu.m, the reflectance of radio waves tends to decrease and the cost increases.

The thickness of the metal layer is usually 0.01 μm to 1111 mm, preferably 10 μm=0.5 mm.

If the V of this metal layer is less than 0.01 μm, the radio wave reflection performance will be poor, and if it is less than 10 μm, wrinkles, cuts, and folds will easily occur in this metal layer when manufacturing a parabolic antenna reflector, and the resin The thickness of the protective film (2) may require reinforcing the gold pA layer as the adhesive film becomes thicker, and if the thickness exceeds 1, the weight of the resulting parabolic anti-boo reflector increases, resulting in an increase in cost. Moreover, there is a tendency that it becomes difficult to form the laminate made of the three layers.

The thickness of the composition layer containing polyamide and polyolefin is usually 500 μm to 15 am, preferably L<10
It is desirable that the thickness is 00 μm to 51 μm. The thickness of the composition layer containing this polyamide and polyolefin is 50 mm.
Less than 0 μm means rigidity and ? Ij impact strength is insufficient,
In addition, if the weight exceeds 15, the product tends to have sink marks and distortion, and the weight of the product tends to increase.

When the parabolic anti-reflector according to the present invention is used as a reflector, a primer layer may be provided on one or both sides of the metal layer constituting the reflector. , 2 can further increase the interlayer adhesion strength of each layer constituting the secondary reflector.

The primer layer 17 is preferably formed of a material such as acrylic, epoxy, phenol, polyester, polyurethane, or polyamide primer.

The thickness of the primer layer formed in such a shrine t4 is
Usually, it is about 0.1 μm to 500 μm.

Although the diameter of the parabolic antenna reflector according to the present invention varies depending on the application, it is usually between 2 and 1.
It is about 00(7).

Further, the parabolic antenna reflector 1 according to the present invention as described above is used together with a converter 21, a converter support arm 22, a parabolic antenna reflector support 23, a cable 24, etc., as shown in FIG. 2, for example.

t-1 Even if the parabolic antenna reflector according to the present invention is provided with a boss portion 11, a rig portion (not shown), etc., there is no problem.

As described above, the manufacturing method of the parabolic antenna reflector provided with the boss portion etc. is as shown in Fig. 3 (A) and Fig. 1 (A).
As shown in , a metal layer laminate 10 consisting of a metal layer 3 and a resin protective layer 2 is applied to a parabolic convex surface, and a composition containing polyamide and polyolefin is applied to a concave shape.
Alternatively, as shown in FIG. 3 (B) and FIG. 1 (B), the laminate 1 [
) to form the peripheral flange shape,
It is also possible to injection mold the layer 4 by applying the metal layer laminate 10 to the parabolic convex surface 9 and injecting a composition containing polyamide and polyolefin so as to conform to the shape of the four sides 12.

Next, each layer constituting such a parabolic antenna reflector 1 will be explained.

Resin Protective Layer For the resin protective layer 2, a thermoplastic resin with excellent heat resistance is used.

Examples of such thermoplastic resin include PTFE.
, FEPSPFA, polyvinylidene fluoride resin (Pvd
F), fluorine resins such as P V F, vinyl chloride resins, olefin resins such as ethylene homopolymers, propylene homopolymers, ethylene-propylene copolymers,
Examples include acrylic resins, fluorine-acrylic copolymer resins, polyamide resins, polyester resins, polycarbonate resins, and modified products and copolymers of these resins.

The resin protective layer made of such a thermoplastic resin may be formed by foaming the thermoplastic resin as described above.

Among these thermoplastic resins, it is preferable to use fluororesins, and more preferably pVF, PVdF
It is desirable to use

There are film lamination methods and coating methods described below to adhere these resins to the metal layer, but especially when laminating films, chemical treatment such as chemical conversion treatment, corona treatment, sputtering etc. are used on the adhesion side or both sides of the film. Strong adhesion can be obtained by applying treatment, such as treatment or primer treatment, depending on the material.

When such a fluororesin is used, a parabolic antenna reflector with excellent heat resistance tends to be obtained.

Methods for producing such thermoplastic resins and their physical properties are already known.

Metal layer The metal layer constituting the parabolic antenna reflector according to the present invention has the function of reflecting radio waves, and may include, for example, a single metal such as aluminum, iron, nickel, copper, or zinc, or Alloys whose main components are these metals,
For example, stainless steel, brass, etc. are used.

These metals may be previously subjected to chemical treatment such as chemical conversion treatment or chromate treatment, or surface treatment such as plating treatment, and may also be coated or printed. Or, as described below, polyolefins, modified polyolefins, ethylene-vinyl acetate copolymers, ethylene-vinyl acetate copolymers,
Adhesive films such as vinyl alcohol copolymers and modified products thereof, acrylic, polyamide, and polyester adhesive films, or a laminated film obtained by laminating two to three layers of these films may be laminated on the metal in advance.

Composition layer containing polyamide and polyolefin The composition layer containing polyamide and polyolefin mainly has the function of maintaining the shape of a parabolic antenna reflector, and is used for such a layer. As the polyamide, hexamethylene diamine, decamethylene diamine, dodecamethylene diamine, 2.2.4- or 2.
4.4-Trimethylhexamethylenediamine, [,3-
or 1,4-bis(aminomethyl)cyclohexane,
Aliphatic, alicyclic, aromatic diamines such as bis(p-aminocyclohexylmethane), ■- or p-xylylene diamine, adipic acid, superric acid, sebacic acid, cyclohexanedicarboxylic acid, terephthalic acid, isophthalic acid, etc. Polyamide obtained by polycondensation of ε-aminocaproic acid with an aliphatic, alicyclic, or aromatic dicarboxylic acid, 1
Polyamide obtained by condensation of aminocarboxylic acids such as 1-aminoundecanoic acid, ε-caprolactam, ω-
Polyamides obtained from lactams such as laurolactam,
Alternatively, copolyamides made of these components, or mixtures of these polyamides may be used.

Specifically, nylon 6, nylon 66, nylon 61
0, nylon 6/66, nylon 66/610, nylon 6/11, etc. are used.

Among these, nylon 6 and nylon 66 are preferably used because of their excellent rigidity and modification effect on polyolefin.

The molecular weight of such polyamide is not particularly limited, but
Usually, a polyamide having a relative viscosity η (JIS 68IO198% measured in sulfuric acid) of 1.0 or more, preferably 2.0 or more is desirable.

Moreover, the polyolefin constituting this m-composition layer and 11.
Examples include monopolymers of olefins, copolymers of two or more olefins, and the like.

The component units and 1- in such polymers include olefins that usually have about 2 to 18 carbon atoms and are linear or branched. Specifically, examples include ethylene, propylene, Linear olefins such as ■-butene, 2-butene, ■-pentene, 2-pentene, l-hexene, t-heptene, tobexene, ■-decene, 1-dodecene, 2-methyl-1-butene, 3- Olefins which can be used include methyl-1-butene, 2-methyl-2-butene, 3-methyl-1-heptene, 4-methyl-1-pentene, and the like. Among these, propylene is preferably used.

Copolymers of two or more olefins include ethylene-α-primary nophine copolymers, such as ethylene-propylene copolymers, ethylene/l-butene copolymers, propylene/l-butene copolymers, - Binary copolymers such as butene copolymers, or ethylene and two or more other α-primary copolymers
Examples include copolymers with /fin, such as terpolymers such as ethylene-propylene-1-butene copolymers. In addition, as long as these α-olefins are the main ingredients,
Vinyl acetate, vinyl chloride, vinyl alcohol, (meth)
Even if it is a crystalline copolymer made by copolymerizing a vinyl group-containing compound such as acrylic acid, (meth)acrylic ester, maleic acid, maleic anhydride, or glycidyl maleate in an amount of 10 mol% or less. good. Among these, Echi 1
/N-propylene 1f1 combination is preferably used.

These copolymers may be block polymers or random copolymers.

The polyolefin used in the present invention usually has crystallinity (7, density is usually 0.89 to 0.98r10J
, preferred L <l; 10°89~0.93g/yA
and ilF! in decalin at 135°C! The determined limiting viscosity [η] is usually 0.3 to 15 d (17 g, preferably 0.
4 to 10 dfI/g', melt flow rate (
Old 'R: ASTM D 1238.1,) is usually 0.0
1-400 g/10 min, preferably 0.02-7
Desired to be 0 g/10 minutes 1-. Yes.

For example, polyolefins with MFR within the above range are
The difference in melt viscosity from polyamide is small, and the dispersion effect tends to be excellent.Using such a polyol/fin makes it possible to obtain a parabolic antenna reflector with excellent impact resistance.

In addition, all or part of such polyolefin may be graft-modified with a modifier. Such modifiers include graft monomers such as unsaturated carboxylic acids or derivatives thereof.

Specific examples of unsaturated carboxylic acids or derivatives thereof include acrylic acid, fumaric acid, tetrahydrophthalic acid,
Itaconic acid, citraconic acid, crotonic acid, isocrotonic acid, nadic acid (endocys-bicyclo[2,2,1
unsaturated carboxylic acids such as 1hept-5-ene-2,3-dicarboxylic acid), or derivatives thereof, such as acid halides, amides, imides, anhydrides, esters, and more specifically, Nonyl, 71 neuimide, 71 twinic anhydride, cytolinic anhydride, methyl acrylate,
Examples include methyl methacrylate, monomethyl 71tonic acid, dimethyl maleate, and glycidilma]noe-1. Among these, unsaturated dicarboxylic acids or their acid anhydrides are preferably used, and maleic acid, nadic acid, or their acid anhydrides are particularly preferably used.

The modified polyolefin obtained by graft modification with such a modifier contains 10% by weight or less of the graft monomer, usually 0.
．． 0.001 to 10% by weight, preferably 0.1 to 5% by weight.

In order to graft-modify the above-mentioned polyolefin with a modifier, a known method can be adopted, such as a method in which the polyolefin is melted and then a modifier is added to the polyolefin to carry out graft copolymerization, or There is a method in which a polyolefin is dissolved in a solvent, and then a modifier is added to the polyolefin to perform graft copolymerization. In any case, in order to efficiently graft copolymerize the modifier to the polyolefin, it is preferable to carry out the reaction in the presence of a radical initiator.

The graft reaction is usually carried out at a temperature of 60 to 350°C. The usage ratio of the radical initiator is 100% polyolefin
It is usually in the range of o,oot to 20 parts by weight. As a radical initiator, organic peroxide,
organic peresters, such as benzoyl peroxide,
Dichlorobenzoyl peroxide, dicumyl peroxide, di-tart-butyl peroxide, 2,5-dimethyl-2,5-di(peroxide benzoate) hexyne-3,1,4-bis(tart-butylperoxyisopropyl)benzene, lauroyl peroxide ,ta
rt-butyl peracetate, 2,5-dimethyl-2,
5-di(terL-butylperoxy)hexyne-3,2
, 5-dimethyl-2,5-di(tert-butylperoxy)hexane, tart-butylperbenzoate,
Lert-butylperphenylacetate, terL-
Butyl perisobutyrate, tert-butyl perisobutyrate 5
ee-octoate, lert-butyl perpivalate, cumyl pervivalate and tert-butyl perdiethyl acetate, as well as other azo compounds such as azobisisobutyronitrile, dimethylazoisobutyrate. Among these, dicumyl peroxide, di-terL-butyl peroxide, 2,5-dimethyl-2
,5-di(tert-butylperoxy)hexyne-3
, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 1,4-bis(tert-butylperoxyisopropyl)benzene and the like are preferred.

In the composition layer containing the above-mentioned polyamide and polyolefin, the polyolefin is usually 20 to 500 parts by weight, preferably 2 parts by weight, per 100 parts by weight of the polyamide.
It is used in an amount of 5 to 400 parts by weight. If the polyolefin is less than 25 parts by weight, deformation is large and sufficient surface precision cannot be obtained.

On the other hand, if it exceeds 400 parts by weight, there is a tendency that sufficient adhesive strength cannot be obtained.

In order to obtain a composition comprising the polyamide and polyolefin described above, the various components described above are mixed using a conventionally known method such as a Henschel mixer, a Ribbon blender, a Kumbler blender, etc.; A method of melt-kneading, granulating or pulverizing using a screw extruder, twin-screw extruder, kneader, Banbury mixer, etc. can be adopted.

In the parabolic antenna reflector according to the present invention, a layer made of a composition containing polyamide and polyolefin having a coefficient of linear expansion similar to that of the metal forming the metal layer is provided on the metal layer on the opposite side to the resin protective layer. Because of this, excellent interlayer adhesive strength between the metal layer and the composition layer containing polyamide and polyolefin is maintained even if the layer expands and contracts due to heat cycles or the like.

The composition layer made of the composition obtained as described above is
It has excellent rigidity and low water absorption, so changes in physical properties or dimensions are small due to changes in temperature.

Therefore, when forming this composition layer, it is not necessary to use an inorganic or organic filler in order to improve the above-mentioned properties as in the past, but an inorganic or organic filler may be used. .

Examples of inorganic fillers include powder fillers such as alumina,
Oxides such as magnesium oxide, calcium oxide, zinc white, aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, calcium hydroxide, tin oxide hydrate,
Hydrated metal oxides such as zirconium oxide hydrate; carbonates such as calcium carbonate and magnesium carbonate; silicates such as talc, clay bentonite, and attapulgite; borates such as barium diborate and zinc borate; and aluminum phosphate. , sulfates such as digypsum phosphate such as sodium tripolyphosphate; sulfites; and mixtures of two or more of these; fibrous fillers such as glass fibers, potassium titanate fibers, metal-coated glass fibers, ceramic fibers, Examples include lastite, carbon fiber, metal carbide fiber, metal cured fiber, etc., as well as spherical objects such as glass beads, glass balloons, and shirasu balloons, glass powder, glass flakes, and mica.

In addition, the surface of the inorganic filler may be coated with a silane compound such as vinyltriethoxysilane, 2-aminobrobyltrie 1-
It may be treated with xysilane, 2-glycidoxypropyltrimethoxysilane, etc. Among these inorganic fillers, mica, talc, and glass fiber are preferred because they have excellent reinforcing effects such as rigidity.

0 machine filler and 1. Examples include polyester fiber, polypropylene-free fiber, polyester fiber, polyamide fiber, vinylon fiber, rayon fiber, hemp, human silk, and cellulose.

In the present invention, these fillers can also be used in combination.

The amount of such a filler is not particularly limited, but
When forming the composition layer described above, 1% by weight is usually added to the composition containing polyamide and polyolefin.
Below, preferably 0 to 10% by weight, more preferably 0
It is desirable to use melon with a content of ~5 times.

When forming a composition layer containing polyamide and polyolefin, the above polyamide and polyolefin are combined with a stabilizer against oxygen, heat, ultraviolet rays, etc., a metal degrading coloring agent, Various additives such as electrical property improvers, antistatic agents, lubricants, processability improvers, nucleating agents, flame retardants, pigments, and tackiness improvers may be added to the extent that the purpose of the present invention is not impaired. good.

Production of a parabolic antenna reflector The parabolic antenna reflector according to the present invention is composed of three layers: a resin protective layer as described above, a metal layer, and a composition layer containing polyamide and polyolefin (or modified polyolefin). To manufacture, first, dry lamination method, hot melt method, glue lamination method, polylamination method,
The metal and the plastic resin are thermally laminated by a method such as an extrusion lamination method. Alternatively, a pre-coat layer can be applied to the metal surface using coating methods such as roll coating, reverse coating, or gravure coating. Mo1.

It is also possible to post-paint parabolic antego with metal surfaces.

Such lamination can be performed according to a conventional method.

At this time, the metal surface 1, which is to be brought into contact with the thermoplastic resin, may be subjected to a primer treatment 12 by a gravure coating method, a reverse coating method, or the like.

The primer treatment is carried out, for example, by applying a primer to one side of the metal in the manner described above and then drying it at 50-100°C. Next, a thermoplastic resin film or sheet, etc., is applied on the metal surface that has been primed as necessary in a film of 50 to 100 ml.
Pressure bonding may be performed using a pressure bonding roll heated to .degree.

Next, a composition layer containing polyamide and polyolefin is formed on the metal layer of the two-layer laminate consisting of the metal layer and the resin protective layer laminated as described above, and the parabolic material according to the present invention is formed. Manufactures antenna reflectors.

Prior to laminating the composition layer containing polyamide and polyolefin and the (two-layer) laminate in this way,
On the metal surface of the two-layer laminate that is to be bonded with the above composition in advance,
Surface treatments such as primer treatment, chemical conversion treatment, polymerization treatment, plasma treatment, sputtering treatment, etc. are performed in the same manner as above, or polyolefin groups, modified polyolefin systems, ethylene-acetic acid L'-, L-copolymer, ethylene- An adhesive film of vinyl alcohol copolymer, acrylic, polyamide, polyester, etc. may be laminated on the metal in advance.

When forming a composition layer containing polyamide and polyolefin on the laminate as described above, for example, the third
An injection mold 5 as shown in the figure is used. This mold usually includes a movable mold 6 and a fixed mold 7 facing the movable mold.

First, this mold is provided with an injection molding nozzle 8. Although the position of this nozzle is not particularly limited, it is usually provided in a fixed mold.

In order to manufacture the parabolic antenna reflector according to the present invention using such an injection mold, first, the surface of the resin protective layer of the two-layer laminate is brought into contact with the inner surface 9 of the movable mold. ,
The laminate 10 is set in a mold so that a gap is formed between the metal layer and the mold for injection molding a composition containing polyamide and polyolefin. That is, the laminate is dropped between the molds and the circumference is held down with a ring such as an air cylinder, or the laminate is preformed in advance, preferably with a flange shape, and then the laminate is placed in the mold paraboloid. Insert on the surface (convex) side.

Next, a composition containing polyamide and polyolefin is injected into the mold from an injection molding nozzle provided in the mold, and a composition layer containing polyamide and polyolefin is formed on the metal layer of the laminate. 4 should be formed.

The injection molding temperature of the composition containing the above polyamide and polyolefin varies depending on the properties of the copolymer used, but is higher than the melting point of the composition containing this polyamide and polyolefin, and is thermally decomposable. The temperature is usually 230 to 350°C, preferably 250 to 300°C.

The injection pressure also changes depending on the injection molding temperature, etc., but is usually 50 to 150 kg/c, preferably 80 to 1
It is 20 kg/c-.

Effects of the Invention The parabolic antenna reflector according to the present invention uses a composition containing polyamide and polyolefin whose coefficient of linear expansion is small over a wide temperature range. The difference in coefficient of linear expansion between the metal layer and the composition containing the polyamide and polyolefin is small, and delamination is particularly difficult to occur between the metal layer and the composition layer containing the polyamide and polyolefin. Therefore, when forming a composition layer containing polyamide and polyolefin, there is no need to add a large amount of filler to the composition as in the conventional case.

In addition, since the parabolic antenna reflector according to the present invention uses a composition containing polyamide and polyolefin as described above, it has a significantly superior surface area and less uneven radio wave reflection than conventional ones. A board is obtained.

Furthermore, in the parabolic antenna reflector according to the present invention, various complicated shapes such as boss portions can be easily provided, and even if the boss etc. are provided, no sink marks are produced on the reflective surface.
It maintains its beautiful appearance, its mechanical strength, dimensions, etc. do not easily change even if the environment changes, it has excellent impact resistance, and is weather resistant, water resistant,
It also has an excellent balance of chemical resistance and hot water resistance.

In this way, the parabolic antenna reflector according to the present invention is
Because it has excellent impact resistance, it is possible to obtain excellent heat-resistant rigidity without adding large amounts of fillers such as inorganic fillers to the composition containing polyamide and polyolefin. By reducing the amount of
The composition layer can be made thinner, and the weight of the antenna reflector can be reduced.

Further, the parabolic antenna reflector according to the present invention can be manufactured by a simple manufacturing process as described above.

[Examples] The present invention will be described below with reference to Examples, but the present invention is not limited to these Examples.

In the following Examples and Comparative Examples, each measured value was determined by the following method.

Weather resistance test: After exposing the parabolic antenna reflector for 2,000 hours using a Sunshine Carbon Weathermeter at a black panel temperature of 63°C and a due cycle of 12 minutes/(60 minutes of irradiation), the appearance of its surface ( Deleterious changes such as changes in gloss, crazing, blistering, peeling of metal foil, and cracks) were evaluated. Note that in Table 1, the O mark means "no problem as determined by visual inspection", and the X mark means "abnormality is observed as determined by visual inspection".

Heat cycle test: The sample was exposed to 80°C for 2 hours, then gradually cooled to -45°C over 4 hours, exposed at this temperature for 2 hours, and then gradually heated to 80°C over 4 hours. After conducting the test 100 times, the appearance of the surface of the sample was evaluated in the same manner as in the weather resistance test.

Flexural modulus: 11 according to ASTM D-790
It was fixed at 11.

Linear expansion coefficient: Measured according to ASTM D~696.

Deformation of the reflector: Deformation was performed by visual judgment (by placing the sample on a surface plate) 〇 Used in Examples and Comparative Examples 1. The types and physical properties of the thermoplastic resin, inorganic filler, and metal foil of the resin protective layer are shown below.

[Thermoplastic resin] <PVdF> Melt Solo-L/ is a thermoplastic resin with excellent weather resistance.
- (ASTM D 1238L': Accordingly, temperature 250
Polyvinylidene fluoride (hereinafter referred to as rP dPJ) <PV
Double-sided treated polyvinyl fluoride film with a thickness of 38 μm (trade name: Tetra-Dekopon Oki) [Metal foil] Aluminum (hereinafter rAI) with a thickness of about 15 μm
It's called IJ. ) [Thermoplastic resin comprising polyamide and polyolefin] Polyamide> Ny66 having a relative viscosity of 2.50 as a polyamide
(Manufactured by Ube Industries, Ltd. Product name: Nylon 2
01513) Nylon 6 having a relative viscosity of 2.3 (manufactured by Unitika, trade name Unitika Nylon B A1025), aromatic nylon> Aromatic NY (aromatic polyamide) was synthesized as follows.

1,6-diamithexane 254 g (2,19M)
, 2471 g (1,49 M) of terephthalic acid 106 g (0,64 M) of isophthalic acid and 0.45 g (4,25 x 1) of sodium hypophosphite (4,25 x 1
0'''H) and 148 ml of ion-exchanged water were charged into a 1°OfI reactor, and after nitrogen substitution, the reaction was carried out at 250°C and 35 kg/cm for 1 hour.
kg/cd is extracted to a receiver with a low pressure setting, and the intrinsic viscosity [η] is 0, 10 dff/g (concentrated sulfuric acid, 30
545 g of polyamide (°C) was obtained.

Next, after drying this polyamide, a cylinder setting ifi[33o'e-t
'P melt polymerization and the intrinsic viscosity [η] is 1, 1 d j?
/ g (i9i! acid, 30° C.) of an aromatic polyamide was obtained.

This aromatic polyamide contained 71% of the mole 96 of the 1 min unit of te1nophthalic acid peel, and the melting point was 320'C.

Modified polyolefin> As a modified polyolefin, MFR=1.4/10
A sample of homopolypropylene (manufactured by Mitsui Ishiura Kagaku Gyokugyo, trade name: Highball J300) was graft-modified with maleic anhydride so that the grafting rate was 0.5% by weight.

Polyolefin> Polyolefin/fins include homopolypropylene with MFR = 12 g/10 min (Mitsui Petrochemicals Intermediate Co., Ltd. trade name: Highball 700) [Inorganic filler] Talc and mica (with an average particle size of 5 μm) Aspect ratio 10) Glass fiber (tJI M 7113
μrn, Nonotsu l” length 3 b+l+-, hereinafter rGF
It's called J. ) and calcium carbonate (hereinafter referred to as CaCOa J) having an average particle size of 0.5 μmn. On the other hand, apply an acrylic primer (manufactured by Showa Kobunshi Co., Ltd., trade name Vinyroll 92) to a thickness of 20 μm on one side of A470, and apply 1 methane primer on the other side. A primer (manufactured by Toyo Morton Co., Ltd., trade name Atonito!! 35) was applied to a thickness of 20 μm and dried.Then, the Ai foil (metal foil) treated with the primer was treated with an acrylic primer. The Ai) foil and the PVdF film were laminated so that the surfaces faced inside.

Furthermore, 60 parts by weight of Ny66 and modified P P 4 C1
parts by weight for 5 minutes using a Henschel mixer, and from the resulting mixture, pellets were produced using a Ikegai 1) CM 45 twin-screw extruder at a resin temperature of 280°C.

The laminated metal foil produced as described above was placed on the male side of the mold of an injection molding machine (mold clamping force: 550 tons) so that it would become the mold side (with a resin protective layer with excellent weather resistance on the moving side of the mold). inserted into. After closing the mold, the injection pressure is 80kg/c on the metal layer side.
- NY66/modified PP pellets at a resin temperature of 240℃
Knead at the same temperature, insert injection molding at the same temperature,
A type 5 parabolic antenna reflector was manufactured.

Table 1 shows the physical properties of this reflector.

Examples 2 to 4 and Comparative Examples 1 to 3 The resin composition of the layer containing polyamide and polyolefin and the resin temperature during insert injection molding are shown in Table 2, but otherwise the molding was carried out in the same manner as in Example 1.

Table 1 shows the physical properties of the manufactured parabolic antenna reflector.

Table 2 Example 5 A 38 μm layer of polyvinyl fluoride (PVF) film (product name: manufactured by Tetra DuPont ■) was provided as a surface resin protective layer on one side of a 100 μm soft aluminum foil, and an adhesive layer was provided on the other side of the aluminum foil. as ethylene-vinyl acetate, R
I case (1; VA) 100 μIli of film was dry laminated using a urethane-based rolling agent. 6. The resulting laminate was preliminarily molded with a PVF protective surface on the concave side of a paraboloid. In 4j- on the object side (moving side)
) Shita.

After closing the mold, injection molding of 5% of NV6 modified PP mica was carried out on the EVA contact n-layer at an injection pressure of 80 dazzles/C- at a resin temperature of 240°C to form a 45-type parabolic antenna reflector. Built.

Example 6 Eight sides of a 100 μm soft aluminum foil were coated with an epoxy primer with a thickness of 5μ as a surface resin retaining layer, and then a polyester top coat was applied on top of the 3 layers with a polyester top coat of 15 μm.
It was coated with μmFq-sample and baked. On the aluminum surface side of the obtained color-coated aluminum, a layer of adhesive was applied.
Copolymer film 40um 1/tan welding W'l1
The obtained laminate was heated in the same manner as in Example 5 using a dry laminated horn of 3 mm (D>6).
Injection molded at a resin temperature of 240℃, 4
5 type parabolic antenna reflector! ! ! Construction 1. Ta.

[Brief explanation of the drawing]

1A and 1B are schematic cross-sectional views showing one embodiment of a parabolic antenna reflector according to the present invention, and FIG. 2 is a partial perspective view of a parabolic antenna to which a parabolic antenna reflector according to the present invention is attached. FIGS. 3A and 3B are schematic sectional views of a parabolic antenna reflector according to the present invention and a mold used in manufacturing the parabolic antenna reflector. 1... Parabolic antenna reflector 2... Resin protective layer 3... Metal layer 4... Composition layer containing polyamide and polyolefin 5... Mold 6... Moving mold 7...
・Fixed mold 8... Nozzle 10 ・Double layer 1
j? Rest 21 ・Converter~22...=1 Inverter support arm 23... Barabozu] ゛・Tena reflector support column 24...
Gauge Jlz

Claims (4)

[Claims] (1) A parabolic antenna reflector comprising a resin protective layer, a metal layer, and a layer made of a composition containing polyamide and polyolefin, which are laminated in this order. (2) The parabolic antenna reflector according to claim 1, wherein part or all of the polyolefin has been graft-modified with a modifier. (3) A resin protective layer is formed on the metal surface by laminating a resin film or sheet or coating with resin on one side of the metal, and the other side of the metal is subjected to plasma treatment, primer treatment, etc. An adhesive layer is formed by surface treatment or lamination of an adhesive film, and the resulting laminate is placed in a mold so that the resin protective layer of the laminate is in contact with the convex surface of the mold, and then prepared for the mold. A parabolic antenna characterized in that a layer made of a composition containing polyamide and polyolefin is formed on an adhesive layer by injecting a composition containing a polyamide and a polyolefin into a mold from a nozzle formed in the mold. Method of manufacturing a reflector. (4) The method for manufacturing a parabolic antenna reflector according to claim 3, characterized in that the polyolefin is a modified polyolefin partially or entirely graft-modified with a modifier.