JPS61218203A - Installation for communication - Google Patents

Abstract

PURPOSE:To obtain a material with excellent weather resistance, dirt resistance and adhesion with a fiber reinforced resin or a metal used for a communication installation such as an antenna, its accessory and a radome by providing a protecting layer including a fluorinated vinylidene copolymer and an ultraviolet ray absorbing agent. CONSTITUTION:The protection layer is a layer having a film thickness of 5-100mum obtained by applying a fluorine resin paint consisting of a polymer component using a fluorinated vinylidene copolymer having a functional group as the major component, a cross-linked agent and an ultraviolet ray absorbing agent to a film and cross-linking and curing the coated paint at a normal temperature. As the ultraviolet ray absorbing agent, for example, a benzophenon chemical compound is used. The compounding ratio of the copolymer including fluorine or cross-linked body to the benzophenon chemical compound is 100/0.1-10 in weight ratio, and preferably 100/0.5-7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to communication equipment. More specifically, the present invention relates to communication equipment provided with a protective layer that has excellent antifouling properties, high adhesion to a base material, and excellent weather resistance and corrosion resistance.

[Conventional technology]

With the start of satellite broadcasting by the Japan Broadcasting Corporation and the beginning of consideration of satellite communications using advanced information systems, many types of antennas, including parabolic antennas, helical antennas, loaded antennas, corner reflector antennas, and flat antennas, were developed. Antenna has been developed.

Fiber-reinforced resins such as FRP are used for these antennas, their auxiliary equipment, and radomes, but since they lack weather resistance when used alone, polyvinyl fluoride resin films are bonded to the surface.

[Problem that the invention seeks to solve]

When conventional polyvinyl fluoride resin films are bonded together, the films tend to peel off at the seams.
Further, there are problems such as poor processability and the need for a special adhesive to attach the film.

Furthermore, since the protective layers of antennas, radomes, etc. must be transparent to radio waves, there is a problem in that conventional ultraviolet protection methods using pigments cannot be used.

The present invention provides communication equipment that is provided with a protective layer that has excellent adhesion to fiber-reinforced resin or metal used in communication equipment such as antennas, their auxiliary equipment, and radomes, and has excellent weather resistance and anti-slip properties. The purpose is to provide

Means for Solving Problems] The present invention provides a communication device provided with a protective layer containing a vinylidene fluoride copolymer having a functional group and/or a crosslinked product of a vinylidene fluoride copolymer and an ultraviolet absorber. Regarding equipment for use.

In this specification, communication equipment refers to outdoor antennas such as parabolic antennas, helical antennas, loaded antennas, and corner reflector antennas, communication antennas for communication satellites, radomes for large antennas, simple radomes, converters, and mounting poles. This concept includes antennas such as antennas and their attached equipment.

[Function and Examples]

The protective layer in the present invention is a fluororesin paint consisting of a polymer composition whose main component is a vinylidene fluoride copolymer having a functional group (hereinafter referred to as a fluorine-containing copolymer), a crosslinking agent, and an ultraviolet absorber. The film thickness obtained by coating and crosslinking and curing at room temperature is about 100 μm.

The fluorine-containing copolymer has properties that conventional fluororesins do not have, namely, it cures at room temperature to form a hard film, and the formed coating film has properties such as corrosion resistance and weather resistance that fluorine-based polymers have. It is kept as is. Furthermore, it has good adhesion to base materials for communication equipment such as FRP. Regarding each component, composition, etc. of such a fluorine-containing copolymer, please refer to the patent application filed in 1973.
8-175123.

In the present invention, the fluorine-containing copolymer usually contains 50 to 99 mol% vinylidene fluoride, preferably 65 to 85 mol%, and 1 to 50 mol% vinyl monomer having a functional group, preferably 1 to 10 mol%. or vinylidene fluoride 50 to 99 mol%, preferably 65 to 85 mol%, vinyl monomer having a functional group 1 to 50 mol%, preferably 1 to 10 mol%, and preferably less than 30 mol% of fluoroolefins other than vinylidene fluoride. is comprised of 10 to 25 mol%.

Gel vermini-silane chromatography (G
The molecular weight measured by PC (based on polystyrene) is usually 1
It ranges from 10,000 to 500,000.

The vinyl monomer having the above functional group usually has the formula: % formula %) (wherein, X is a hydroxyl group, carboxyl group or glycidyl group, k is O or lsm is an integer of θ to 10,
is a compound represented by the formula: %formula% (wherein X and n are as above) , Formula: %Formula%) (In the formula, Y is hydrogen or a methyl group, p is an integer of 1 to 4,
X is as defined above, or a compound represented by the formula: %Formula% (wherein, Y is as defined above).

The fluoroolefins other than vinylidene fluoride mentioned above are usually tetrafluoroethylene, chlorotrifluoroethylene, monofluoroethylene, trifluoroethylene, hexafluoropropene, lower fluoroalkyl vinyl ether, etc., and preferably tetrafluoroethylene or chlorotrifluoroethylene. be.

Examples of ultraviolet absorbers include benzophenone compounds. The blending ratio of the fluorine-containing copolymer or crosslinked product and the benzophenone compound is usually 10010 by weight.
．． 1 to 10, preferably 10010.5 to 7.

The benzophenone compound is a compound having a so-called benzophenone structure, and preferably has the general formula: The compound is a compound represented by a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or a benzyl group, but is not limited thereto.

This benzophenone compound is a known compound and is commercially available.

Examples of such benzophenone compounds include 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-
4-ethoxybenzophenone, 2-hydroxy-4-butoxybenzophenone, 2-hydroxy-4-octaoxybenzophenone, 2.2g-dihydroxy-4,4
1-dimethoxybenzophenone, 2,4'-dihydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2-hydroxy-4- Octadecyloxybenzophenone, 2,2°.

4.4-Tetrahydroxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, 2-
Examples include hydroxy-4-methoxy-2'-carboxypunzophenone and 2,2'-dihydroxy-4,4'-dimethoxy-5-sulfobenzophenone.

As a method for producing the fluorine-containing copolymer used in the present invention, for example, each component is mixed with a polymerization catalyst in the presence of a solvent at a temperature of -20 to 150°C, preferably 5 to 95°C, and
~30 k+r/dG, preferably 10 pupils/dG
Methods such as emulsion polymerization, suspension polymerization bed or solution polymerization in an aqueous medium under the following pressure conditions may be employed.

Further, the fluorine-containing copolymer of the present invention has good compatibility with an acrylic resin and can be used in combination with an acrylic resin.

The above-mentioned acrylic resin means a single or copolymer of acrylate or methacrylate containing an alkyl group having 1 to 8 carbon atoms. For example, a single or copolymer of methyl methacrylate, ethyl methacrylate, butyl methacrylate, cyclohexyl acrylate, etc. Commercially available acrylic resins such as copolymers of the above acrylates or methacrylates with hydroxyethyl methacrylate, methacrylic acid, glycidyl methacrylate, styrene, acrylonitrile, etc. include Hytaloid 3004, Hythaloid 3018, Hythaloid 3046C (all Hitachi Chemical types), Acrydic Examples include, but are not limited to, A31G-45, Acrizo Ink A314, and Acrizo Ink 47-540 (all manufactured by Dainippon Ink and Chemicals).

The acrylic resin preferably contains 50% by weight or more of methyl methacrylate and has a molecular weight (GPC) of 5,000 to 300,000 from the viewpoint of compatibility with the fluorine-containing copolymer.

The blending ratio of the fluorine-containing copolymer and acrylic resin is usually 1 part by weight of the fluorine-containing copolymer to 1 part by weight of the acrylic resin.
The amount is 0 to 1900 parts by weight, preferably 25 to 400 parts by weight. When blended within this range, the weather resistance, translucency, and
Good pigment dispersibility etc.

The protective layer in the present invention is usually prepared by blending a fluorine-containing copolymer with a crosslinking agent and an ultraviolet absorber as described above, and uniformly mixing and dissolving the coating composition in a suitable solvent. It is formed by applying it to the surface, crosslinking and curing it at room temperature. ``Curing proceeds quickly at room temperature, and a hard coating film can be obtained normally in 1 to 10 days, but the time required for curing can be shortened by drying at a temperature raised to a level that does not adversely affect the substrate.

The crosslinking agent is a functional group (
hydroxyl group, carboxyl group or glycidyl group)
It is a compound having two or more groups capable of crosslinking the fluorine-containing copolymer by reacting with the fluorine-containing copolymer. When the functional group is a hydroxyl group, the crosslinking agent is usually an isocyanate, an acid anhydride, or the like. When the functional group is a carboxyl group, it is usually an isocyanate, an amine, an amino resin, a compound containing a glycidyl group, etc. When the functional group is a glycidyl group, it is usually an amine. Examples of isocyanates include, but are not limited to, hexamethylene diisocyanate, tolylene diisocyanate, hydrogenated tolylene diisocyanate, and block isocyanates thereof. Examples of amines include diethylene triamine, triethylene tetramine, xylene diamine. , metaphenylenediamine, benzyldimethylamine, bisaminopropyltetraoxaspiroundecane, etc. Examples of acid anhydrides include, but are not limited to, phthalic anhydride, pyromellitic anhydride, mellitic anhydride, etc. Examples of amino resins include, but are not limited to, alkyl etherified methylol melamine, alkyl etherified methylol urea, alkyl etherified benzoylguanamine, etc. Examples of compounds containing glycidyl groups include, but are not limited to: Formula: %Aliphatic diepoxide or aromatic diepoxide represented by formula% (wherein 2 is a glycidyl group, R1 is an alkylene group having 2 to 10 carbon atoms or a divalent aromatic group having 6 to 10 carbon atoms) Examples include, but are not limited to, dieboxide, aromatic triepoxide represented by the formula: % formula % (wherein R1 is a trivalent aromatic group, and Z is the same as above).

The amount of the crosslinking agent is preferably adjusted to 0.5 to 2 equivalents based on all the functional groups in the fluorine-containing copolymer and the acrylic resin.

Unlike conventional fluorine-containing copolymers, a wide range of ordinary solvents can be used as the solvent. Specific examples include esters such as ethyl acetate, butyl acetate, isobutyl acetate, and cellosolve acetate; acetone, methyl ethyl ketone,
Ketones such as methyl isobutyl ketone; cyclic ethers such as tetrahydrofuran; amides such as N-dimethylformamide and N-dimethylacetamide; alcohols such as methyl alcohol, ethyl alcohol, and butyl alkonyl; aromatics such as toluene and xylene One or more types of hydrocarbons may be used.

The concentration of the fluorine-containing copolymer varies depending on the coating method and coating manufacturing method, but is usually 5 to 70% by weight, preferably 20 to 60% by weight.

In the fluorine-containing copolymer coating composition, other polymers, curing accelerators, dyes, pigments, viscosity modifiers, leveling agents, anti-gelling agents, light stabilizers, anti-scald agents, A dispersant, an antifoaming agent, etc. may be added.

The communication equipment of the present invention coats a base material made of FRP or the like with a fluororesin paint containing a polymer composition whose main component is a vinylidene fluoride copolymer having a functional group, a crosslinking agent, and an ultraviolet absorber. , obtained by crosslinking and curing at room temperature to elevated temperature.

When painting, it may be applied directly to the base material, but if necessary, other layers such as acrylic resin, urethane resin, etc. may be applied to the base material.
One or more layers of undercoating paint such as epoxy resin may be provided, and the protective layer used in the present invention may be formed thereon.

Application to the substrate can be carried out by a conventional method such as a spray method, a dipping method, a dipping method, a roll coating method, or a knife coating method.

Next, the present invention will be explained with reference to Examples, but the present invention is not limited to these Examples.

Production example VdF/CTFE/M5FP containing 50% by weight (7G/
To 100 parts of a fluorine-containing copolymer solution (solvent: methyl isobutyl ketone) with a molar ratio of 20/10, 1 g of Sumithorp 110 (specially manufactured by Sumitomo Chemical) was added as an ultraviolet absorber, mixed well, and then mixed with 30% by weight of butyl acetate. diluted to. This is called varnish (1).

In addition, 1 g of the ultraviolet absorber Sumithorp 130 (manufactured by Sumitomo Chemical Co., Ltd.) was added in the same manner, and the mixture was diluted to 30% by weight with butyl acetate. This is called varnish (2).

The copolymer solution containing no ultraviolet absorber was coated with varnish (3
).

Varnishes (4) to (2) were prepared in the same manner as for varnish 111 using the fluorine-containing copolymers and compositions shown in Table 1 by changing the copolymers.

Coronate EH for these varnishes (11-(2)
(polyisocyanate crosslinking agent manufactured by Nippon Polyurethane Industries ■) to fluorine-containing copolymer and acrylic resin OHHI3
In contrast, an amount equivalent to NC0 value 1.1 of Coronate EH and 1 g of solid content of dibutylcindilaurate as a curing accelerator.
Paints 1 to 12 were prepared by adding 1X10-'g to the sample.

Example 1 Unsaturated polyester sheet containing 30% by weight of glass fiber (
50 cranes x 100 m x 2 pieces) was used as a sample piece, the surface of this was washed with acetone, dried, and then coated with paint 1 to form a coating film with a thickness of about 40 μm, cured at room temperature for 7 days, and then used as a test piece. I got it.

Examples 2 to 22 Test pieces of Examples 2 to 22 were obtained by combining paints prepared from the varnishes shown in Table 3 and sample pieces in the same manner as in Example 1.

Comparative Examples 1 to 4 Test pieces of Comparative Examples 1 to 4 were obtained by combining the paints and sample pieces shown in Table 3 in the same manner as in Example 1.

The following tests were conducted on each of the test pieces obtained in Examples 1 to 22 and Comparative Examples 1 to 4. The results are shown in Table 4.

〔Weatherability〕

Using a Sunshine Weather-O-meter manufactured by Suga Test Instruments, we conducted an accelerated weather resistance test for 4,000 hours with continuous irradiation, a rainfall cycle of 18 minutes and 7,120 minutes, a humidity of 60%, and a black panel temperature of 63°C, and observed the appearance. ○ in table 4
indicates no abnormality, Δ indicates discoloration, and X indicates occurrence of blisters.

〔Weatherability〕

Using a salt spray tester manufactured by Suga Test Instruments ■, 5% saline was sprayed onto the test piece with scratches marked with an x mark, and the test was conducted for 2000 hours, and the surface condition was observed after the test. Indicates no abnormality.

The abbreviations in Table 1 indicate the following compounds.

VdF: vinylidene fluoride CTFE: chlorotrifluoroethylene TFE
: Tetrafluoroethylene M5FP: CF, Hawk CF CF t CHz OH3F HA : CF
t -CF CHt CHz OHHBVE: Hydroxybutyl vinyl ether 7FHA: CF, 雛-C
FCFtCFtCHzCM! O) I MMA: 'Methyl methacrylate EMA:
Ethyl methacrylate HEMA: Hydroxyethyl methacrylate BMA: Butyl methacrylate MA: Methacrylic acid 5FBA: CFg"CFCFiCOOH Table 1 Table 2 Table 3 Table 4 [Effects of the invention] As described above, vinylidene fluoride copolymers containing functional groups Polymer compositions containing polymers as a main component can be cured at room temperature and can form a coating film with excellent corrosion resistance and weather resistance that adheres closely to the substrate, so the coating film can be used as a protective layer. The provided communication equipment of the present invention has extremely excellent corrosion resistance, weather resistance, and excellent durability.

Claims (1)

[Claims] 1. Vinylidene fluoride copolymer having a functional group and/or
Or communication equipment provided with a protective layer containing a crosslinked vinylidene fluoride copolymer and an ultraviolet absorber.