JPH0367865B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a fluororubber coated product obtained by coating a base material with a fluororubber water-based paint, and more specifically, the present invention relates to a fluororubber-coated product made by coating a base material with a fluororubber water-based paint, and more specifically, the present invention relates to a fluororubber-coated product comprising a base material coated with a fluororubber water-based paint, and more specifically, a fluororubber-coated product comprising a fluororubber, a fluororesin, a specific aminosilane compound, an aqueous liquid carrier, and a fluororubber-coated product. In short, it relates to a coated product in which a fluororubber water-based paint containing an inorganic fibrous substance and containing a specific ratio of fluororubber and fluororesin is applied to a base material and cured. [Conventional technology] Fluoro rubber paints are based on the excellent heat resistance of fluoro rubber,
Due to its weather resistance, oil resistance, solvent resistance, and chemical resistance, it is widely used as an industrial material by coating or impregnating it on various substrates such as metals, plastics, rubber, textiles, nonwoven fabrics, fibers, and others. The present inventors have found that as long as a specific aminosilane compound having an amino group at the end of the molecule is first used, the fluoro rubber water-based paint will not gel and will not work as an adhesive like conventional fluoro rubber water-based paints. Not only does it have excellent adhesion to the base material, but it also has a long pot life and does not cause undesirable phenomena such as stringing even when spray painting with a high fluorine rubber concentration, making it advantageous for painting applications. I got the knowledge that it can be done (patent application 1984-103813)
No. Specification). Furthermore, by adding an amine compound having at least one amino group directly connected to an aliphatic hydrocarbon group, a coating film with excellent mechanical properties (particularly tensile strength) can be obtained. (Specification of Japanese Patent Application No. 123620/1982). [Object and structure of the invention] Based on the above knowledge, the present inventors improved the non-adhesiveness and lubricity of the surface of the fluororubber coating film obtained from the fluororubber water-based paint, and developed the application of the fluororubber coating. As a result of further studies to expand the range, we found that by blending a specific amount of fluororesin into each of the above fluoro rubber water-based paints, we were able to obtain a coating that did not impair any of the characteristics of the above-mentioned fluoro rubber water-based paints. The present invention was completed based on the discovery that the non-adhesiveness and lubricity of the film surface can be increased, and if an inorganic fibrous substance is added thereto, the compressive recovery properties of the coating film can be improved. That is, the gist of the present invention is, first, (a) fluorocarbon rubber, (b) fluorocarbon resin, and (c) general formula: [Wherein, R is -CH ₃ or -C ₂ H ₅ , X is a single bond, -(CH ₂ ) ₂ -NH-, -CONH-, or -
( _CH2 ) ₂ -NH( _CH2 ) ₂ -NH-, n represents 2 or 3], (d) an aqueous liquid carrier, and optionally (e) an inorganic fibrous material. The weight ratio of component (a) and component (b) is 95:5 to 35:65
A fluororubber coated product comprising a base material coated with a fluororubber water-based paint characterized by the following. Furthermore, another gist of the present invention is to produce a fluoro rubber water-based paint having the above-mentioned characteristics by further containing an amine compound having at least one terminal amino group directly connected to an aliphatic hydrocarbon group in the above-mentioned components. It consists of fluoro rubber coated products coated on a base material. In the present invention, the fluororubber coating film obtained by blending a specific amount of fluororesin imparts non-adhesion and lubricity to its surface without substantially impairing its adhesion to the substrate and mechanical properties. This is possible because the fluororesin, which itself has non-adhesive and lubricating properties, surprisingly gathers on the surface of the fluororubber coating, without adversely affecting the adhesion to the substrate or the mechanical properties of the coating. It is presumed that the above-mentioned performance of the fluororesin is effectively manifested on the surface of the fluororubber coating film. Component (a), that is, the fluororubber used in the present invention, is a highly fluorinated elastic copolymer, and particularly preferred fluororubber is usually 40 to 85 mol% of vinylidene fluoride. Examples include elastic copolymers with at least one other fluorine-containing ethylenically unsaturated monomer that can be copolymerized with this. In addition, fluororubber containing iodine in the polymer chain has, for example, 0.001~
10% by weight, preferably from 0.01 to 5% by weight of iodine, and at least one other fluorine-containing ethylenically unsaturated monomer which can be copolymerized with the same 40 to 85 mol% of vinylidene fluoride as described above. This is a fluororubber whose main composition is an elastic copolymer consisting of Other fluorine-containing ethylenically unsaturated monomers that can be copolymerized with vinylidene fluoride to give elastic copolymers include hexafluoropropylene, pentafluoropropylene, trifluoroethylene, trifluorochloroethylene, and tetrafluoroethylene. ethylene,
Vinyl fluoride, perfluoro(methyl vinyl ether), perfluoro(ethyl vinyl ether), perfluoro(propyl vinyl ether)
etc. are exemplified as representative examples. Particularly desirable fluororubbers are vinylidene fluoride/hexafluoropropylene dielastic copolymers and vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene terelastic copolymers. Fluororubbers are usually used in the form of aqueous dispersions. For aqueous dispersion, a fluororubber emulsion itself obtained by polymerizing the above-mentioned monomers by emulsion polymerization is generally used, but it can also be obtained by emulsion polymerization, suspension polymerization, bulk polymerization, etc. The produced fluoro rubber is crushed or pulverized as necessary,
If necessary, a material dispersed in water using a surfactant may also be used. The aqueous dispersion of fluorocarbon rubber generally contains 10 to 70% by weight, preferably 30 to 60% by weight.
Those containing fluororubber at % by weight are used,
These concentrations can generally be adjusted by concentration or dilution. Usually, in addition to the surfactants mentioned above, pigments used as general paint compounding agents, acid acceptors, fillers, etc. commonly used in the processing of fluororubber can be added as appropriate to these aqueous dispersions. Component (b), that is, the fluororesin, includes polytetrafluoroethylene, tetrafluoroethylene, and at least one other ethylenically unsaturated monomer copolymerizable therewith (for example, olefins such as ethylene and propylene, hexafluoroethylene, etc.). Examples include copolymers with propylene, vinylidene fluoride, chlorotrifluoroethylene, halogenated olefins such as vinyl fluoride, perfluoroalkyl vinyl ethers, etc.), polychlorotrifluoroethylene, polyvinylidene fluoride, and the like. Among these, preferred fluororesin is at least one of polytetrafluoroethylene, tetrafluoroethylene and hexafluoropropylene, perfluoromethyl vinyl ether, perfluoroethyl vinyl ether, and perfluoropropyl vinyl ether (usually 40 mol% based on tetrafluoroethylene). (included below). Fluororesins are usually used in the form of aqueous dispersions. Aqueous dispersion is a polymer emulsion itself obtained by emulsion polymerization of the above monomers,
A polymer obtained by suspension polymerization, bulk polymerization, etc. may be crushed, pulverized, and dispersed in water using a surfactant if necessary. Component (c), that is, a specific aminosilane compound having an amino group bonded to the end of the molecule shown in the above general formula, functions as a vulcanizing agent for fluororubber, and
It is also believed to greatly contribute to improving the adhesion to the base material, and can be safely used in aqueous media. Examples of typical compounds include γ-
Aminopropyltriethoxysilane (hereinafter referred to as A-
1100), N-β-aminoethyl-γ-aminopropyltrimethoxysilane, N-(trimethoxysilylpropyl)ethylenediamine, N-β
Examples include -aminoethyl-γ-aminopropylmethyldimethoxysilane, γ-ureidopropyltriethoxysilane, and β-aminoethyl-β-aminoethyl-γ-aminopropyltrimethoxysilane. Component (d), that is, an aqueous liquid carrier, is selected from water and a mixture of water and a water-soluble organic liquid, and examples of the water-soluble organic liquid include alcohols such as methanol, ethanol, propanol, ethylene glycol, carbitol, and cellosolve. can. Component (e), that is, an inorganic fibrous material, is not an essential component in the present invention, but may be used if necessary for coating gaskets, packing, etc., in order to improve the compression recovery properties of fluoro rubber coatings. Examples include glass fiber, carbon fiber, asbestos fiber, potassium titanate fiber, etc. This inorganic fibrous material has an average length of at least
It is desirable that the thickness is 1μ, preferably 1μ to 100μ. Furthermore, an amine compound having at least one terminal amino group directly connected to an aliphatic hydrocarbon group (hereinafter referred to as an amine compound) is optionally added.
mainly functions as a vulcanizing agent for fluorocarbon rubber, and also improves mechanical properties together with the aminosilane compound. Typical examples thereof include ethylamine, propylamine,
Butylamine, benzylamine, allylamine,
Monoamines such as n-amylamine and ethanolamine, ethylenediamine, trimethylenediamine, tetramethylenediamine, hexamethylenediamine, 3,9-bis(3-aminopropyl)
-2,4,8,10-tetraoxaspiro[5,
5] Diamines such as undecane (hereinafter referred to as V-11), polyamines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, among others, compounds having two or more terminal amino groups is preferred. In order to prepare the water-based paint used in the present invention, the pigment, acid acceptor, filler, etc. described above are usually blended into an aqueous dispersion mixture of fluoro rubber and fluoro resin according to a conventional method (as necessary). Depending on the situation, a surfactant may be further used.) To the obtained dispersion, an aminosilane compound represented by the above general formula and, if necessary, an amine compound are added. (Additives such as fluorine rubber may be added.) A uniform fluororubber water-based paint can be obtained by thoroughly mixing in a conventional manner. In addition, when adding the aminosilane compound of the above general formula to the aqueous dispersion of the fluororubber, if it is added directly, the viscosity may increase and gelation may occur in some parts. To prevent this, it is preferable to partially or completely hydrolyze the aminosilane compound with water before adding it. The ratio of fluoro rubber and fluoro resin is 95:5 by weight.
~35:65, and if the ratio of fluororesin is less than the above lower limit, the desired improvement in non-stick properties and lubricity will not be sufficient; conversely, if it is higher than the above upper limit, the desired improvement will not be achieved. A coating film with the desired thickness cannot be obtained, and cracks and pinholes are likely to occur in the coating film. The amount of the aminosilane compound added is usually 1 to 30 parts by weight, preferably 1 part by weight per 100 parts by weight of fluororubber.
~20 parts by weight. When an amine compound is added as desired, it is blended so that the total sum of the aminosilane compound and the amine compound takes the above value. In this case, the molar ratio of the aminosilane compound to the amino compound is selected from the range of 1:99 to 90:10. As the acid acceptor, those commonly used in the vulcanization of fluororubber can be similarly used, such as one or more divalent metal oxides or hydroxides. Specific examples include oxides or hydroxides of magnesium, calcium, zinc, lead, and the like. Further, as the filler, silica, clay, diatomaceous earth, talc, carbon, etc. are used. The fluororubber water-based paint used in the present invention is applied or impregnated onto a base material by a normal coating method (brushing, dipping, spraying, etc.) at a temperature of room temperature to 400°C, preferably 100 to 400°C. The desired fluororubber coating film is cured for an appropriate period of time (the aminosilane compound and further the amine compound chemically react with the main chain molecules of the fluororubber to form a crosslinked product with a three-dimensional network structure). It can be done. The fluororubber coating film of the present invention thus obtained has the above-mentioned outstanding performance inherent to fluororubber,
It has excellent adhesion to the base material and mechanical properties (especially tensile strength), and also has non-adhesive and lubricious properties on its surface. Therefore, the fluororubber water-based paint used in the present invention can be usefully used in the production of coated products in fields that require each of these properties, particularly non-stick properties and lubricity. For example, various gaskets, especially metal gaskets made of iron, aluminum, and copper metals (including alloys of these metals), gaskets, valve stem seals for automobiles, reed valves, rubber seal rings for hydraulic equipment, printing, and woven fabrics. , various paper rolls, mixing rolls, paint mixer tanks, stirring blades, conveyor belts for rubber and resin molded products, printing belts, high-frequency heating belts, diaphragms, fibers, decolorization and dyeing in the paper industry, Rubber coupling materials for household mixers such as doctor knives and guides used in cleaning processes, molds for molding various resins, cleaning jigs for precision equipment, various plating bathtubs and their cleaning bathtubs, fuel holders and chemicals. It is used for coating the inside surfaces of cars, the surfaces of resin and rubber linings, and various wires, as well as for conductive paints. For example, the metal gasket of a car cooler compressor coated with the fluoro rubber water-based paint according to the present invention has a non-adhesive coating film, so that the sealing surface that occurs with a gasket coated with a conventional fluoro rubber paint can be avoided. There are no adverse effects caused by adhesion to the compressor, such as difficulty when removing and replacing worn parts of the compressor, impossibility of reusing the removed gasket, and seal failures when assembling a new product due to residual rubber partially adhering to the sealing surface. Furthermore, the removed gasket can withstand reuse. By the way, the metal gasket applied to the swash plate compressor as the car cooler compressor will be explained with reference to FIGS. 1 and 2. A pair of silling blocks 1F, Both ends of 1R are valve plates 3F and 3R.
One end of the drive shaft 16 is sealed by front and rear housings 4F and 4R disposed with the cylinder blocks 1F and 1R interposed therebetween, and is rotatably supported through approximately the axial center of the cylinder blocks 1F and 1R. teeth,
It penetrates the front housing 4F and protrudes to the outside (a shaft sealing device 50 is disposed in the protruding portion to maintain airtightness), and can be connected to an external power source. The cylinder blocks 1F, 1R have an appropriate number of pairs of cylinder bores 2F, 2R arranged on the same circumference centered on the axis of the drive shaft 16.
The cylinder bore 2 is bored parallel to the drive shaft.
The piston 20 fitted into F and 2R is attached to the swash plate 17 which is fixed to the drive shaft 16 at an angle.
It is moored to the shoe 18 and ball 19 via bearing means. The valve plates 3F, 3R are provided with an inlet 31 and an outlet 32 corresponding to the cylinder bores 2F, 2R, respectively.
Suction valve seats 33, 33 each having a suction reed valve portion that can be opened and closed to freely close the cylinder block 1.
A discharge valve seat 2 is provided with a discharge reed valve portion 21A which is sandwiched between F, 1R and valve plates 3F, 3R and which freely opens and closes the discharge port 32.
1 and 21 are held between the housings 4F and 4R and the valve plates 3F and 3R, respectively, together with a gasket 100, which will be described later and also serves as a discharge valve holder, which is disposed overlappingly thereon. Inside the housings 4F, 4R are suction chambers 6F, 6R and discharge chambers 5F, 5R.
are respectively formed into sections, and these are inlets 31,
31 and discharge ports 32, 32, it can communicate with the cylinder bores 2F, 2R, respectively, and is also communicated with the suction side and the discharge side of the external refrigeration circuit, respectively, by appropriately known means (not shown). Note that 8 is a tightening bolt for assembling and holding the entire compressor. Here, the gasket 1
00 and the discharge valve seat 21. First, the discharge valve seat 21 has an annular base 21B,
It is composed of a discharge reed valve portion 21A that protrudes radially corresponding to the discharge port 23, and the gasket 1
00 indicates the first annular portion 104 corresponding to the base 21B of the discharge valve seat 21 and the partition walls 41F and 41R for separating the inner peripheral sides of the discharge chambers 5F and 5R of the housings 4F and 4R, and the discharge chamber 5F. ,5
Partition walls 42F and 4 that separate R from the suction chambers 6F and 6R
A second annular portion 103 corresponding to 2R, and a third annular portion 105 corresponding to partition walls 43F and 43R that separate the outer peripheral sides of the suction chambers 6F and 6R from the outside of the compressor.
, a rib portion 106 bridged at an appropriate location between the second annular portion 103 and the third annular portion 105 , and the discharge wall between the first annular portion 104 and the second annular portion 103 . Discharge reed valve part 2 of seat 21
1A, the rib portion 107 is bent so as to be further away from the discharge reed valve portion 21A toward its tip, and the rib portion 107 is bent to be further away from the discharge reed valve portion 21A. It is configured to also serve as a retainer that restricts deformation of the valve portion 21A. Then, the gasket 1
On the surface of 00, a fluoro rubber water-based paint is applied to a substantially uniform film thickness of 20 to 50 microns using a known coating method such as dipping or spray painting. At this time, the desired shape may be obtained by punching and press-forming a plate material that has been previously coated with the paint. If the paint is applied to the object formed into the desired shape, the paint will also be applied to the broken surface of the punch, so peeling of the paint film can be effectively prevented, and the base material can be When it is made of metal, it is preferable because it can prevent rust. As the base material, plate materials made of metals such as iron-based, aluminum-based, and copper-based metals (including alloys of these metals), as well as plates made of various hard resins can be used. In the swash plate compressor configured in this way, the gasket 100 is compressed on both sides at each portion of the first annular portion 104, the second annular portion 103, and the third annular portion 105. The sealing property is sufficiently maintained by the fluoro rubber water-based paint applied to the swash plate 17. During operation, when the drive shaft 16 rotates under the driving force from an external power source, the rotational force of the swash plate 17 Yotsute piston 20
The cylinders reciprocate within the cylinder bores 2F and 2R to perform the suction, compression, and discharge operations that are inherent to a compressor, and the manner in which they are performed is as follows. That is, due to the suction action generated in the cylinder bores 2F, 2R, the housing 4F,
The refrigerant introduced into the suction chambers 6F and 6R of 4R pushes open the suction reed valve portions of the suction valve seats 33 and 33 through the suction ports 31 and 31, and flows into the cylinder bores 2F and 2.
After flowing into R and being compressed there, its discharge action pushes open the discharge reed valve parts 21A, 21A of the discharge valve seats 21, 21 from the discharge ports 32, 32, and the housings 4F, 4R. Discharge chamber 5
It flows into F and 5R and is sent out from there to the external refrigeration circuit. At this time, the discharge reed valve parts 21A, 21A, which are deformed by the discharge refrigerant pressure, are pressed against the rib part 107 of the gasket 100 which also serves as a retainer, and the amount of deformation is regulated. Although damage to 21A is prevented,
The fluorocarbon water-based paint film adhered to the surface of the rib portion 107 is applied to the discharge reed valve portion 21.
This reduces the impact when A and 21A come into contact, prevents noise, and also helps prevent damage. Although this embodiment has been described with respect to a swash plate type compressor, the present invention can also be implemented with respect to various other types of compressors such as other reciprocating types and rotary types such as vane types. Furthermore, when painted on the surface of a rubber seal ring for hydraulic equipment, the lubricity of the coating film reduces sliding resistance while maintaining sealing properties, thereby preventing troubles such as malfunctions. In addition, since it provides lubricity, the stick-slip properties on the coating film surface are generally improved, and the deformation of the coating film and the occurrence of scratches on the coating film are reduced. In addition, the fluororubber water-based paint used in the present invention has a long pot life of 2 weeks to 1 month, is easy to handle during painting, and has no abnormalities such as stringing even at fluororubber concentrations of up to 60% by weight. It is possible to spray paint without causing any problems,
It has the advantage of being easy to obtain a thick coating film. Hereinafter, the content of the present invention will be specifically explained with reference to Examples. However, all parts are by weight. Examples 1 to 7 and Comparative Examples 1 to 4 (Non-adhesiveness test on painted surface) After uniformly mixing the following liquids A and B at a predetermined ratio, they were purified by filtration through a 200-mesh wire mesh to remove fluorine. A rubber water-based paint was obtained. Liquid A (Note 1) Fluororubber water-based dispersion (fluororubber content 60% by weight, Nonion HS-208
including. ) 166 parts (Note 2) Fluororesin aqueous dispersion (fluororesin content 50% or 60% by weight, nonionic HS-
Contains 208. ) Magnesium oxide shown in Table 1 3 parts Medium thermal carbon 20 parts Nonionic HS-208 (20% by weight aqueous solution) 2 parts Water 50 parts Note 1) Vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene elastic copolymer ( Note 2) Polytetrafluoroethylene (hereinafter simply referred to as fluorocarbon rubber)
PTFE) or tetrafluoroethylene/
Hexafluoropropylene copolymer (hereinafter referred to as
FEP). B Liquid A-1100 40 parts V-11 20 parts Water 40 parts Mixing ratio of Liquid A and B Liquid A containing 166 parts of fluororubber aqueous dispersion: Liquid B 10 parts On the other hand, length 100 mm, width 50 mm, An aluminum plate with a thickness of 1 mm was degreased by washing with acetone. The above paint was spray-painted on the degreased aluminum plate surface, and then dried at 50 to 70°C for 10 minutes.
A coating film with a film thickness of 30 μm was formed and heated at 300°C (Examples 4 to 7).
In Comparative Example 2, the coating film was cured at 380°C for 10 minutes. In order to check the contact angle of the coating film of each test piece with water, one drop of pure water was dropped at 24°C using a goniometer manufactured by Elma Optical Co., Ltd., and the contact angle was measured. . The results are shown in Table 1. As a comparative example, a similar test was conducted without using the fluororesin aqueous dispersion, and the results are also listed in Table 1.

[Table] In Comparative Examples 3 and 4, pinholes and cracks occurred even at a film thickness of 10 μm, and the desired coating film could not be obtained. Examples 8 to 14 and Comparative Examples 5 to 6 (Lubricity test of coating film surface) Using the test piece prepared in Example 1, a steel ball 8 was measured at 24°C using a Bauden-Lebel friction coefficient measuring machine.
The friction coefficient was measured under the following conditions: mm, load 250 g, and linear velocity 0.2 cm/sec. The results are shown in Table 2.

【table】

[Table] Examples 15 to 17 and Comparative Examples 7 to 9 (Adhesiveness test) After uniformly mixing the following solutions A and B at a predetermined ratio, they were purified by filtration through a 200-mesh wire mesh to obtain fluorocarbon rubber. A water-based paint was obtained. A Liquid fluororubber aqueous dispersion (fluororubber content 60% by weight, including Nonion HS-208) 166 parts Fluorine resin (FEP) aqueous dispersion (FEP content 50% by weight, Nonion HS-208) 208) 60 parts Magnesium oxide 3 parts Medium thermal carbon 20 parts Water 50 parts B Liquid aminosilane compound 90 parts Water 10 parts Mixing ratio of liquids A and B 100 parts of liquid A: 5 parts of liquid B Meanwhile, length 100 mm An aluminum plate and an iron plate each having a width of 50 mm and a thickness of 1 mm were degreased by washing with acetone, and then the iron plate was subjected to a blasting process. The above paint was spray-coated on the surfaces of the aluminum plate and iron plate, and then dried at 50 to 70°C for 10 minutes. Furthermore, the same spraying and drying process was performed for a total of 3 times.
This was repeated several times to form a coating film with a thickness of 100 to 150 μm. Subsequently, the coating film was cured at 150°C for 30 minutes.
Each of the obtained coating films was cut into strips with a width of 10 mm to the extent that the base material was scratched, and the edges were heated at 50.0 ± 2.5 mm/min at 24°C using a Shimadzu Autograph IS-500.
A 180 degree peel test was conducted by pulling at a speed of . The results are shown in Table 3.

[Table] Examples 18 to 21 and Comparative Examples 10 to 11 (Tensile strength test of coating film) In Examples 19 to 21, the same liquids A and B of Example 1 were used. Liquid B was added to 166 parts of the raw rubber aqueous dispersion in the proportions shown in Table 4. However, Example 18
In Comparative Examples 10 and 11, A-1100
and the molar ratio of the amine compound is 1:1,
Both were added so that the total amount was 0.01 mol.

[Table] Example 22 (Pot life, spray painting, and painted product test) The following solutions A and B were mixed at a ratio of 5 parts of solution B to 100 parts of solution A, and pot life was carried out in the same manner as in Example 1. A water-based paint made of raw rubber was obtained. A Liquid fluororubber aqueous dispersion (fluororubber content 60% by weight, including Nonion HS-208) 166 parts Fluororesin aqueous dispersion (FEP content 50% by weight as fluororesin, Nonion HS) -208) 60 parts Magnesium oxide 3 parts Medium thermal carbon 20 parts Nonion HS-210 (manufactured by NOF Corporation) 2 parts Water 50 parts B Solution A-1100 40 parts V-11 20 parts Water 40 parts Obtained The fluoro rubber paint was placed in a 300 ml glass bottle with a lid, allowed to stand at 24°C, and the pot life was examined. As a result, the solid content of the paint did not gel even after 10 days, and redispersion was possible. In addition, the above-mentioned fluororubber paint was separately sprayed on an SPCC metal gasket of a car cooler compressor under the following conditions: nozzle diameter 0.8 mm, spray pressure 3.0 Kg/cm ² . As a result, a smooth coating film with a thickness of approximately 30 μm was obtained without any abnormalities in the spray coating. The resulting fluororubber-coated gasket was assembled into a car cooler compressor with a surface pressure of 300 kg/ ^cm2 , and the discharge gas temperature was approximately 120°C (this gasket was
The compressor was operated for 500 hours at a temperature of 120°C. When the compressor was disassembled after the operation was stopped and the gasket was attached and removed, it was found that it could be easily removed from the sealing surface, and there was almost no swelling due to fluorocarbon gas (R-12) or refrigerating machine oil, and the gasket was reusable. (See reference photo A). On the other hand, for comparison, after operating the compressor under the same conditions as above, using the same gasket as the conventional product coated with ordinary fluoro rubber or nitrile rubber treated with graphite to prevent adhesion on the surface. , I also removed the gasket in the same way. In the former case, the work was difficult due to the tight contact with the sealing surface, and furthermore, the fluororubber partially peeled off, making the gasket impossible to reuse. Additionally, fluorocarbon rubber was protruding around the gasket (see reference photo B). In the latter case, nitrile rubber protruded around the gasket (see reference photo C). Note that if this protrusion falls off during compressor operation, it may become a foreign object in the circuit and get caught in the sliding surface or valve seat surface, causing malfunction. Example 23 (Compression recovery test) A: 166 parts of liquid fluorocarbon rubber aqueous dispersion (fluorocarbon rubber content: 60% by weight, including nonionic HS-208) Fluorocarbon resin aqueous dispersion (as fluorocarbon resin) FEP content 50% by weight, including nonionic HS-208) 60 parts magnesium oxide 3 parts medium thermal carbon 20 parts potassium titanate fiber 6 parts nonionic HS-208 (20% aqueous solution) 2 parts water 110 parts B Liquid A- 1100 40 parts V-11 20 parts water 40 parts Mixing ratio of liquids A and B Liquid A containing 166 parts of fluorocarbon aqueous dispersion: 30 parts of liquid B Painting is done by spray painting on an iron plate, with a uniform thickness of approximately 50μ. A coating film was obtained. A metal ring was placed on the painted surface and heat pressed at 150° C. for 5 minutes with a surface pressure of 300 kg/cm ² . When painting with a conventional water-based fluororubber paint (liquid A, excluding the fluororesin and potassium titanate fibers), traces of metal rings remained on the pressed surface of the paint film, whereas the water-based paint of the present invention In the case of fluoro rubber paint,
There were no such abnormalities. Example 24 and Comparative Examples 11 to 12 After uniformly mixing the following liquids A and B,
The mixture was purified by filtration through a 200-mesh wire mesh to obtain a fluoro rubber water-based paint. A Liquid fluororubber aqueous dispersion (fluororubber content 60% by weight, including nonion HS-208) 166 parts fluoroplastic (FEP) aqueous dispersion (fluoroplastic content 50% by weight, nonionic) (Contains HS-208.) (Note 1) 60 parts magnesium oxide 3 parts nonionic HS-208 (20% by weight aqueous solution) 2 parts water 50 parts Note 1) In Comparative Example 11, no fluororesin aqueous dispersion was used. B Solution A-1100 40 parts V-11 20 parts Water 40 parts According to the procedure of Example 1, Solution A containing 166 parts of fluororubber aqueous dispersion and 10 parts of Solution B were mixed. In Example 12, only liquid A was used. Fluorine rubber vulcanized plate (length 50 mm, width 50 mm, thickness 2
The obtained water paint was spray-painted on the surface (mm), dried at 25℃ for 5 minutes, then at 60℃ for 10 minutes, and the thickness was
A coating film of 30μ was formed. Subsequently, the coating film was cured at 300°C for 15 minutes. n for cured coating film
- To check the contact angle of hexane, one drop of n-hexane was dropped at 24°C, immediately after dropping, 30 minutes later, and 72
After a period of time, the contact angle was measured using the same device as in Example 1. The results are shown in Table 5.

[Table] It is understood that the composition of the present invention is superior in non-adhesive properties and is also superior in durability compared to the compositions of comparative examples.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the swash plate compressor, and FIG. 2 is a front view of the gasket. 1F and 1R...Cylinder block, 2F and 2R...Cylinder bore, 3F and 3R...
Valve plate, 4F and 4R...Housing, 16...
Drive shaft, 17... Swash plate, 20... Piston, 10
0...Gasket.

Claims (1)

[Claims] 1 (a) Fluororubber, (b) Fluororesin, (c) General formula: [Wherein, R is -CH ₃ or -C ₂ H ₅ , X is a single bond, -(CH ₂ ) ₂ -NH-, CONH-, or -
( _CH2 ) ₂ -NH-( _CH2 ) ₂ -NH-, n represents 2 or 3], (d) an aqueous liquid carrier, and if necessary (e) an inorganic fibrous material. The weight ratio of component (a) and component (b) is 95:5 to 35:65
A fluoro-rubber coated product made by coating a base material with a fluoro-rubber water-based paint. 2. The fluororubber coated product according to item 1, wherein the base material is a gasket. 3. The fluororubber coated product according to item 1, wherein the base material is a metal gasket. 4. The fluororubber coated product according to item 3, wherein the metal is iron, aluminum, or copper-based metal. 5 (a) Fluorine rubber, (b) Fluorine resin, (c) General formula: [Wherein, R is -CH ₃ or -C ₂ H ₅ , X is a single bond, -(CH ₂ ) ₂ -NH-, -CONH-, or -
( _CH2 ) ₂ -NH-( _CH2 ) ₂ -NH-, n represents 2 or 3]; (d) an aqueous liquid carrier; an amine compound having one terminal amino group, and optionally (e) an inorganic fibrous substance, the weight ratio of component (a) to component (b) being 95:5 to 35:65;
A fluoro-rubber coated product made by coating a base material with a fluoro-rubber water-based paint. 6. The fluororubber coated product according to item 5, wherein the base material is a gasket. 7. The fluororubber coated product according to item 5, wherein the base material is a metal gasket. 8. The fluororubber coated product according to item 7, wherein the metal is iron, aluminum, or copper-based metal.