CN111393949A - Self-adhesive paint, corona-resistant polyimide paint and preparation method thereof - Google Patents
Self-adhesive paint, corona-resistant polyimide paint and preparation method thereof Download PDFInfo
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention relates to self-adhesive paint and corona-resistant polyimide paint and a preparation method thereof. The invention also relates to the application of the self-adhesive paint and the corona-resistant polyimide paint in the preparation of self-adhesive corona-resistant polyimide paint and enameled wire. The self-adhesive corona-resistant polyimide paint and the corona-resistant polyimide paint provided by the invention have the advantages of simple preparation process and environmental friendliness, and the subsequent products prepared from the self-adhesive corona-resistant polyimide paint and the enameled wire have excellent comprehensive performance, are very suitable for manufacturing coil windings of high-power motors and large-scale high-power transformers, and have good application prospects.
Description
Technical Field
The invention belongs to the field of electrical insulating materials and electromagnetic wires, and particularly relates to self-adhesive paint and corona-resistant polyimide paint and a preparation method thereof
Technical Field
Enameled wires occupy a very important position in daily life of people, and the enameled wires cannot be separated from small electric hair dryers to deflection coils of large-scale machines. The enameled wires commonly used in the market are coated and wound into a coil, and then the coil is soaked and heated to bond the turns of the conducting wires together. This process has several disadvantages, such as unpredictable permeation inside the coil, frequent occurrence of bubbles and failure to stick; after the impregnating varnish penetrates into the coil, the coil may be subjected to more or less physicochemical reactions through evaporation of the solvent, and the evaporated solvent may pollute the environment and even cause fire. Therefore, researchers at home and abroad continuously develop novel wire enamel, and the self-adhesive wire enamel can reduce the process and the environmental pollution and has good application prospect.
The self-adhesive enameled wire is a special enameled wire and consists of a basic paint film (primer) and an outer self-adhesive paint film, and the performance of the outer self-adhesive paint film is mainly to improve the adhesive strength. The coil wound by the self-adhesive paint can be heated by baking or electrifying to enable the outer coating adhesive layers to interact, and the coil is automatically formed after cooling.
The self-adhesive enameled wire generally adopts a composite layer structure, and the composite layer enameled wire is paid considerable attention to abroad at present, and has multiple varieties and good performance. Because the composite layer enameled wire is formed by coating two (or three) layers of different lacquers, compared with a single-coating enameled wire made of the same material, the composite layer enameled wire has the respective performances of two different materials, and overcomes the performance defects caused by the same material. In the composite layer self-adhesive enameled wire structure, the base line is a main functional insulation part which ensures the insulation performance of the self-adhesive enameled wire, and the self-adhesive layer is mainly used for meeting the requirements of a coil forming process, plays a role in adhesion and has a protection and enhancement effect on the base line.
Compared with the traditional armature winding, the self-adhesive enameled wire also has good coiling property, formability, embeddability and processability, and has the obvious characteristics of greatly simplifying the manufacturing process of the coil winding, omitting complex procedures such as binding, dipping and cleaning in many occasions, saving equipment, electric energy, labor force and other aspects, being beneficial to realizing production automation, improving the product quality and simultaneously bringing remarkable social and economic benefits.
Since the development of self-adhesive wire enamels has been successful, there are many improvements according to the social development progress and the market demand, and at present, from the viewpoint of use, there are mainly the following 5 types.
1 acetal self-adhesive wire enamel
Polyvinyl butyral self-adhesive wire enamel (with the heat-resistant grade of E grade) is a paint which is widely applied in the market, and is generally coated on the outermost layer of insulating paints such as polyvinyl formal, polyurethane and the like, and the bonding mode is heating. In which Monsanto, USA, develops a self-adhesive paint with better adhesion, namely, amine compound with five thousandth of mass is added into the butyral.
2 epoxy resin self-adhesive wire enamel
The epoxy resin self-adhesive paint has good dilutability and convenient wire coating process, and the heat resistance of the epoxy resin wire enamel is higher than that of acetal resin. The enameled wire of the epoxy system mainly comprises the following composite systems: the epoxy resin enamel wire comprises a modified polyester/epoxy composite self-adhesive enameled wire, a polyester imide/polyamide imide/epoxy composite self-adhesive enameled wire, a polyamide imide/epoxy composite enameled wire and a polyimide/epoxy composite enameled wire, wherein the main function of epoxy is an adhesion effect, and the bottom resin enamel plays a key insulating property.
The relevant references are as follows:
weiwenkang, Yu Xinhai, Li Yu Wan [ Chinese adhesive, 2019,28(05):18-20+30 ] developed a high-performance epoxy resin adhesive with excellent comprehensive performance.
Systematic studies on the preparation and performance characterization of epoxy matrix resins were performed by weiwenkang, yuxin hai [ chinese adhesives, 2019,28(02):12-15 ]. The boundary phoenix, Caizinglin, leaf pungent, Linshiyun, Yu Xinhai [ adhesive, 2019,40(05):92-95 ] uses carboxyl-terminated nitrile rubber to toughen and modify epoxy resin for research.
Wufeng, Yuxin Hai, Zhongxing Ping (adhesive 2016,37(05): 53-56.) studied to prepare a novel high temperature resistant two-component epoxy adhesive system.
Modification studies of epoxy resins with bismaleimide resins were carried out in Rozhou, Yu Xin Hai, Chen chiffon, Chen Ji Wei, Liu Wan chapter, Tangxing [ adhesive, 2015,36(12):56-59 ].
The preparation and performance of solvent-free high-temperature-resistant epoxy resin are researched by Tongmai, Yu Xinhai, Chen Jiwei, Liu Wan chapter and Tang Xin [ insulating materials, 2016,49(02):18-21+27 ].
Guo Xiang, Yu Xin Hai, Liu Wan chapter [ adhesive, 2014,35(09):56-60 ] studied the high temperature epoxy adhesives and their curing kinetics.
Yu Xinhai, Chen chiffon, Chen Ji Wei, Liu Wan chapter, Tang Xin [ insulating material, 2016,49(01):25-28+33 ] studied the preparation of high temperature resistant epoxy resin and its curing kinetics.
A novel high-temperature-resistant polyimide modified epoxy adhesive system is developed from Yu Xinhai, Sun Mega [ insulating materials, 2017,50(10):6-9 ].
A novel high-temperature resistant solvent-free epoxy adhesive is developed from Yu Xinhai, Guo Xiang, Chengji Wei, Liu Wan chapter and Hubin [ adhesive, 2014,35(01):33-35+39 ].
3 polyester self-adhesive wire enamel
Polyester resin paint has poor thermal shock resistance, and polyester resin is rapidly aged and decomposed in closed oil, so that polyester is generally modified to improve the heat resistance in practical application, such as two types of BDZ-M and APB enameled wires of Phelps Dodge company in America.
4 polyurethane self-adhesive wire enamel
The polyurethane self-adhesive wire enamel has two characteristics: direct weldability and high frequency property. The coil wound by the self-adhesive paint can be automatically adhered and formed by adopting a baking method, and the coil can be directly welded without removing a paint film when a welding head is welded, so that the process flow is shortened, and the production efficiency is improved.
5 polyamide resin self-adhesive wire enamel
The heat-resistant grade of the polyamide resin self-adhesive paint is up to 180-200 ℃, the enameled wire prepared from the resin has the advantages of high wear resistance, smooth surface, good adhesive force, small friction coefficient and the like, and the enameled wire paint status is increasingly remarkable along with the high-speed development of a high-speed automatic winding machine.
Since the first development of self-adhesive wire enamels by american companies in the last century, different types of self-adhesive wire enamels have been developed successively worldwide, mainly comprising: the direct welding type self-adhesive enameled wire can bear an enameled wire which has excellent moisture resistance, small thermal forming change and low bonding temperature and can be directly welded; the flame-retardant self-adhesive enameled wire is an enameled wire obtained by adding some fireproof flame retardants on the original basis of the self-adhesive enameled wire; the self-lubricating self-adhesive enameled wire is characterized in that the self-adhesive material has lubricating property, so that the internal lubrication of the bonding layer can be realized; B. the F-grade self-adhesive enameled wire, namely the self-adhesive enameled wire has the heat resistance grade reaching B grade (130 ℃) or F grade (155 ℃) and the like.
The global electromagnetic winding wire accounts for 41 percent of sales volume in Asia, wherein the proportion of China is the largest, and is about 11.7 percent of the global market, so that the wire enamel using amount demand of China is naturally vigorous as the largest market of the global winding wire. However, the quality and the brand of various wire enamel products in China have insufficient international competitiveness, and particularly on the high-end wire enamel brand, the wire enamel is very dull and old, and the competitive advantage is lacked, so that the development of the high-end wire enamel and the wire enamel is urgent and imperative. Particularly, a high-end variable frequency motor is developed rapidly, the market share reaches more than 50%, and the variable frequency motor is developed continuously, so that the development of a corona-resistant polyimide enameled wire is urgent in order to meet the market demand, and the nano enameled wire has corona resistance and frequency-change motor pulse resistance and can meet the high technical requirements of the variable frequency motor on the enameled wire. In addition, the high-end enameled wire can meet the requirement of national economic infrastructure, drive the development of related industrial chains, promote the update iteration of industries and products, and improve the competitiveness of domestic products in the international market; the industrial structure of the wire and the cable can be adjusted to advance to a high level; the whole technology development capability of the wire and cable industry is improved; is beneficial to the upgrading and updating of products in the industries of driving motors and transformers.
Disclosure of Invention
The invention provides self-adhesive paint and corona-resistant polyimide paint and a preparation method thereof, and also provides application of the self-adhesive paint and the corona-resistant polyimide paint in preparation of self-adhesive corona-resistant polyimide paint and a method for preparing the self-adhesive corona-resistant polyimide paint. The preparation method is simple in preparation process, environment-friendly, excellent in comprehensive performance of the obtained product, very suitable for manufacturing coil windings of high-power motors and large high-power transformers, and good in application prospect.
In a first aspect, the invention provides a self-adhesive paint, which comprises marine epoxy resin, N, N, N ', N ' -tetraglycidyl-2, 2-bis [4- (4-aminophenoxy) phenyl ] propane TGBAPP, CE793 epoxy resin, 4 ' -diaminodiphenyl sulfone and m-xylylenediamine in a mass ratio of 1: 5-10: 3-8: 0.5-1: 0.1-0.3.
Further, preferably, the structural formula of the marine epoxy resin is as follows:
in a second aspect, the invention also provides a preparation method of the self-adhesive paint, which comprises the following steps:
adding marine epoxy resin, N, N, N ', N ' -tetraglycidyl-2, 2-bis [4- (4-aminophenoxy) phenyl ] propane TGBAPP and 4,4 ' -diaminodiphenyl sulfone into a reaction kettle, stirring, heating to 70-80 ℃, stirring for reacting for 0.5-1 hour, adding CE793 epoxy resin, stirring uniformly, cooling to room temperature, adding m-xylylenediamine, and stirring uniformly at room temperature to obtain the self-adhesive paint.
In a third aspect, the invention provides corona-resistant polyimide paint, which is composed of 20% (w/w) of polyamic acid solution and inorganic nano powder treated by a coupling agent, wherein the mass ratio of the 20% (w/w) polyamic acid solution to the inorganic nano powder treated by the coupling agent is 100: 3-12.
Further, the coupling agent is selected from one or more of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, glycidoxypropyltrimethoxysilane and glycidoxypropyltriethoxysilane, and more preferably, the coupling agent is selected from 3-aminopropyltrimethoxysilane.
Further, the inorganic nano powder is selected from one or more of nano alumina powder, nano silica powder, nano titania powder, nano ferric oxide powder and nano magnesium oxide powder.
Adding aromatic binary primary amine and a strong-polarity aprotic organic solvent into a reaction kettle, stirring and dissolving at room temperature, adding aromatic binary anhydride, stirring and reacting at room temperature for 1-4 hours, adding inorganic nano powder treated by a coupling agent, stirring and grinding uniformly to obtain the corona-resistant polyimide paint; wherein the molar ratio of the aromatic dibasic primary amine to the aromatic dibasic anhydride is 1.05-1.15: 1.00.
In the above method for producing a corona resistant polyimide varnish, preferably, the aromatic primary diamine is selected from the group consisting of p-phenylenediamine, m-phenylenediamine, o-phenylenediamine, trimethyl-m-phenylenediamine, o-methyl-p-phenylenediamine, 4 ' -diaminodiphenylmethane, 3 ' -dimethyl-4, 4 ' -diamino-5, 5 ' -diethyldiphenylmethane, 3 ', 5,5 ' -tetramethyl-4, 4 ' -diaminodiphenylmethane, 3 ' -diaminodiphenylmethane, 4 ' -diaminodiphenyl ether, 3 ' -diaminodiphenyl ether, 4 ' -diaminobenzophenone, 4 ' -diaminodiphenyl sulfone, 4 ' -diaminodiphenyl sulfone, and mixtures thereof, 3,3 ' -diaminodiphenyl sulfone, 4 ' -diaminodiphenyl sulfide, 4 ' -diaminobiphenyl, 2 ' -dimethyl-4, 4 ' -diaminobiphenyl, 2 ' -bis (trifluoromethyl) -4,4 ' -diaminobiphenyl, 1, 4-bis (4-aminophenoxy) benzene, 1, 4-bis (3-aminophenoxy) benzene, 1, 3-bis (4-aminophenoxy) benzene, 1, 3-bis (3-aminophenoxy) benzene, 1, 4-bis (2-trifluoromethyl-4-aminophenoxy) benzene, 1, 3-bis (2-trifluoromethyl-4-aminophenoxy) benzene, 4 ' -bis (4-aminophenoxy) biphenyl, 4 ' -bis (4-aminophenoxy) biphenyl, and mixtures thereof, 4,4 '-bis (2-trifluoromethyl-4-aminophenoxy) biphenyl, 4' -bis (3-aminophenoxy) biphenyl, 4 '-bis (4-aminophenoxy) -3, 3', 5,5 '-tetramethylbiphenyl, 4' -bis (2-trifluoromethyl-4-aminophenoxy) -3,3 ', 5, 5' -tetramethylbiphenyl, 4 '-bis (3-aminophenoxy) -3, 3', 5,5 '-tetramethylbiphenyl, 4' -bis (4-aminophenoxy) diphenyl ether, 4 '-bis (2-trifluoromethyl-4-aminophenoxy) diphenyl ether, 4' -bis (3-aminophenoxy) diphenyl ether, 4,4 ' -bis (4-aminophenoxy) diphenyl sulfide, 4 ' -bis (2-trifluoromethyl-4-aminophenoxy) diphenyl sulfide, 4 ' -bis (3-aminophenoxy) diphenyl sulfide, 4 ' -bis (4-aminophenoxy) diphenyl sulfone, 4 ' -bis (2-trifluoromethyl-4-aminophenoxy) diphenyl sulfone, 4 ' -bis (3-aminophenoxy) diphenyl sulfone, 4 ' -bis (4-aminophenoxy) benzophenone, 4 ' -bis (2-trifluoromethyl-4-aminophenoxy) benzophenone, 4 ' -bis (3-aminophenoxy) benzophenone, 4 ' -bis (4-aminophenoxy) diphenylmethane, 4 ' -bis (4-aminophenoxy) diphenyl sulfide, 4 ' -bis (2-aminophenoxy) diphenyl sulfone, 4 ' -bis (4-, 4,4 '-bis (2-trifluoromethyl-4-aminophenoxy) diphenylmethane, 4' -bis (3-aminophenoxy) diphenylmethane, 2-bis [4- (4-aminophenoxy) phenyl ] propane, 2-bis [4- (2-trifluoromethyl-4-aminophenoxy) phenyl ] propane, 2-bis [4- (3-aminophenoxy) phenyl ] propane, 2-bis [4- (4-aminophenoxy) phenyl ] hexafluoropropane, 2-bis [4- (2-trifluoromethyl-4-aminophenoxy) phenyl ] hexafluoropropane, 2-bis [4- (3-aminophenoxy) phenyl ] hexafluoropropane, 2- (4-aminophenyl) -5-aminobenzimidazole, 4 '-diamino-4' -hydroxytriphenylmethane, 2-bis (3-hydroxy-4-aminophenyl) propane, 2-bis (3-hydroxy-4-aminophenyl) hexafluoropropane, 3, 5-diaminobenzoic acid and/or 3, 5-bis (4-aminophenoxy) benzoic acid.
Further, the aromatic dibasic anhydride is selected from pyromellitic dianhydride, 3 ', 4, 4' -tetracarboxylic benzophenone dianhydride, 3 ', 4, 4' -tetracarboxylic diphenyl ether dianhydride, 3 ', 4, 4' -tetracarboxylic diphenyl sulfone dianhydride, 3 ', 4, 4' -tetracarboxylic diphenyl dianhydride, 1, 4-bis (3, 4-dicarboxyphenoxy) benzene dianhydride, 1, 3-bis (3, 4-dicarboxyphenoxy) benzene dianhydride, 4,4 '-bis (3, 4-dicarboxyphenoxy) diphenyl sulfone dianhydride, 4, 4' -bis (3, 4-dicarboxyphenoxy) benzophenone dianhydride, 4,4 '-bis (3, 4-dicarboxyphenoxy) diphenyl ether dianhydride, 4, 4' -bis (3, 4-dicarboxyphenoxy) diphenyl dianhydride, 2, 2-bis [4- (3, 4-dicarboxyphenoxy) phenyl ] propane dianhydride, 2-bis [4- (3, 4-dicarboxyphenoxy) phenyl ] hexafluoropropane dianhydride and/or 2, 2-bis (3, 4-dicarboxyphenyl) hexafluoropropane dianhydride.
Further, the strong polar aprotic organic solvent is selected from one or more of N, N-dimethylformamide, N-dimethylacetamide, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone and dimethyl sulfoxide.
In a fifth aspect, the invention also provides the use of the self-adhesive paint or the corona-resistant polyimide paint for preparing the self-adhesive corona-resistant polyimide paint or the self-adhesive corona-resistant polyimide enameled wire.
Preferably, the self-adhesive corona-resistant polyimide paint consists of self-adhesive paint and corona-resistant polyimide paint; wherein the content of the first and second substances,
the self-adhesive paint consists of marine bacterial epoxy resin, N, N, N ', N ' -tetraglycidyl-2, 2-bis [4- (4-aminophenoxy) phenyl ] propane TGBAPP, CE793 epoxy resin, 4 ' -diaminodiphenyl sulfone and m-xylylenediamine in a mass ratio of 1: 5-10: 3-8: 0.5-1: 0.1-0.3;
the corona-resistant polyimide paint is composed of 20% (w/w) of a polyamic acid solution and inorganic nano powder treated by a coupling agent, wherein the mass ratio of the 20% (w/w) polyamic acid solution to the inorganic nano powder treated by the coupling agent is 100: 3-12.
Further, the coupling agent is selected from one or more of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, glycidoxypropyltrimethoxysilane and glycidoxypropyltriethoxysilane, and more preferably, the coupling agent is selected from 3-aminopropyltrimethoxysilane.
Further, the inorganic nano powder is selected from one or more of nano alumina powder, nano silica powder, nano titania powder, nano ferric oxide powder and nano magnesium oxide powder.
Further, the structural formula of the marine epoxy resin is as follows:
on the other hand, the invention also provides a self-adhesive corona-resistant polyimide enameled wire which consists of an inner red copper wire core and an outer self-adhesive corona-resistant polyimide paint layer.
In another embodiment, the invention also provides a preparation method of the self-adhesive corona-resistant polyimide enameled wire, which comprises the following steps:
(1) adding marine epoxy resin, N, N, N ', N ' -tetraglycidyl-2, 2-bis [4- (4-aminophenoxy) phenyl ] propane TGBAPP and 4,4 ' -diaminodiphenyl sulfone into a reaction kettle, stirring, heating to 70-80 ℃, stirring for reacting for 0.5-1 hour, adding CE793 epoxy resin, stirring uniformly, cooling to room temperature, adding m-xylylenediamine, and stirring uniformly at room temperature to obtain self-adhesive paint;
(2) adding aromatic binary primary amine and a strong polar aprotic organic solvent into a reaction kettle, stirring and dissolving at room temperature, adding aromatic binary anhydride, stirring and reacting at room temperature for 1-4 hours, adding inorganic nano powder treated by a coupling agent, stirring and grinding uniformly to obtain corona-resistant polyimide paint; wherein the molar ratio of the aromatic dibasic primary amine to the aromatic dibasic anhydride is 1.05-1.15: 1.00.
(3) Putting the corona-resistant polyimide paint into a paint groove of an enameled wire machine, enabling the red copper wire to pass through the paint groove for 12-18 times, passing through a high-temperature drying channel, starting up for wiring, curing at high temperature, and winding to obtain a corona-resistant polyimide enameled wire;
(4) and (3) putting the self-adhesive paint into a paint groove of an enameled wire machine, enabling the corona-resistant polyimide enameled wire to pass through the paint groove and pass through a drying channel, starting up for wiring, heating, semi-curing and rolling to obtain the self-adhesive corona-resistant polyimide enameled wire.
In the above method, preferably, the aromatic diprimary amine described in the step (2) is selected from the group consisting of p-phenylenediamine, m-phenylenediamine, o-phenylenediamine, trimethyl-m-phenylenediamine, o-methyl-p-phenylenediamine, 4 '-diaminodiphenylmethane, 3' -dimethyl-4, 4 '-diamino-5, 5' -diethyldiphenylmethane, 3 ', 5, 5' -tetramethyl-4, 4 '-diaminodiphenylmethane, 3' -diaminodiphenylmethane, 4 '-diaminodiphenyl ether, 3' -diaminodiphenyl ether, 4 '-diaminobenzophenone, 4' -diaminodiphenyl sulfone, o-phenylenediamine, and mixtures thereof, 3,3 ' -diaminodiphenyl sulfone, 4 ' -diaminodiphenyl sulfide, 4 ' -diaminobiphenyl, 2 ' -dimethyl-4, 4 ' -diaminobiphenyl, 2 ' -bis (trifluoromethyl) -4,4 ' -diaminobiphenyl, 1, 4-bis (4-aminophenoxy) benzene, 1, 4-bis (3-aminophenoxy) benzene, 1, 3-bis (4-aminophenoxy) benzene, 1, 3-bis (3-aminophenoxy) benzene, 1, 4-bis (2-trifluoromethyl-4-aminophenoxy) benzene, 1, 3-bis (2-trifluoromethyl-4-aminophenoxy) benzene, 4 ' -bis (4-aminophenoxy) biphenyl, 4 ' -bis (4-aminophenoxy) biphenyl, and mixtures thereof, 4,4 '-bis (2-trifluoromethyl-4-aminophenoxy) biphenyl, 4' -bis (3-aminophenoxy) biphenyl, 4 '-bis (4-aminophenoxy) -3, 3', 5,5 '-tetramethylbiphenyl, 4' -bis (2-trifluoromethyl-4-aminophenoxy) -3,3 ', 5, 5' -tetramethylbiphenyl, 4 '-bis (3-aminophenoxy) -3, 3', 5,5 '-tetramethylbiphenyl, 4' -bis (4-aminophenoxy) diphenyl ether, 4 '-bis (2-trifluoromethyl-4-aminophenoxy) diphenyl ether, 4' -bis (3-aminophenoxy) diphenyl ether, 4,4 ' -bis (4-aminophenoxy) diphenyl sulfide, 4 ' -bis (2-trifluoromethyl-4-aminophenoxy) diphenyl sulfide, 4 ' -bis (3-aminophenoxy) diphenyl sulfide, 4 ' -bis (4-aminophenoxy) diphenyl sulfone, 4 ' -bis (2-trifluoromethyl-4-aminophenoxy) diphenyl sulfone, 4 ' -bis (3-aminophenoxy) diphenyl sulfone, 4 ' -bis (4-aminophenoxy) benzophenone, 4 ' -bis (2-trifluoromethyl-4-aminophenoxy) benzophenone, 4 ' -bis (3-aminophenoxy) benzophenone, 4 ' -bis (4-aminophenoxy) diphenylmethane, 4 ' -bis (4-aminophenoxy) diphenyl sulfide, 4 ' -bis (2-aminophenoxy) diphenyl sulfone, 4 ' -bis (4-, 4,4 '-bis (2-trifluoromethyl-4-aminophenoxy) diphenylmethane, 4' -bis (3-aminophenoxy) diphenylmethane, 2-bis [4- (4-aminophenoxy) phenyl ] propane, 2-bis [4- (2-trifluoromethyl-4-aminophenoxy) phenyl ] propane, 2-bis [4- (3-aminophenoxy) phenyl ] propane, 2-bis [4- (4-aminophenoxy) phenyl ] hexafluoropropane, 2-bis [4- (2-trifluoromethyl-4-aminophenoxy) phenyl ] hexafluoropropane, 2-bis [4- (3-aminophenoxy) phenyl ] hexafluoropropane, 2- (4-aminophenyl) -5-aminobenzimidazole, 4 '-diamino-4' -hydroxytriphenylmethane, 2-bis (3-hydroxy-4-aminophenyl) propane, 2-bis (3-hydroxy-4-aminophenyl) hexafluoropropane, 3, 5-diaminobenzoic acid and/or 3, 5-bis (4-aminophenoxy) benzoic acid.
Further, the aromatic dibasic anhydride described in the step (2) is selected from pyromellitic dianhydride, 3 ', 4, 4' -tetracarboxylic benzophenone dianhydride, 3 ', 4, 4' -tetracarboxylic diphenyl ether dianhydride, 3 ', 4, 4' -tetracarboxylic diphenyl sulfone dianhydride, 3 ', 4, 4' -tetracarboxylic biphenyl dianhydride, 1, 4-bis (3, 4-dicarboxyphenoxy) benzene dianhydride, 1, 3-bis (3, 4-dicarboxyphenoxy) benzene dianhydride, 4,4 '-bis (3, 4-dicarboxyphenoxy) diphenyl sulfone dianhydride, 4, 4' -bis (3, 4-dicarboxyphenoxy) benzophenone dianhydride, 4,4 '-bis (3, 4-dicarboxyphenoxy) diphenyl ether dianhydride, 4, 4' -bis (3, 4-dicarboxyphenoxy) biphenyl dianhydride, 2-bis [4- (3, 4-dicarboxyphenoxy) phenyl ] propane dianhydride, 2-bis [4- (3, 4-dicarboxyphenoxy) phenyl ] hexafluoropropane dianhydride and one or more of 2, 2-bis (3, 4-dicarboxyphenyl) hexafluoropropane dianhydride.
Further, the strongly polar aprotic organic solvent in step (2) is one or more selected from the group consisting of N, N-dimethylformamide, N-dimethylacetamide, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, and dimethylsulfoxide.
Further, the preparation method of the self-adhesive corona-resistant polyimide enameled wire comprises the step (3) of forming the high-temperature drying channel, wherein the highest temperature of the high-temperature drying channel is 400 ℃.
Furthermore, the starting-up wiring in the step (3) is preferably selected, and the linear speed is controlled to be 1-5 m/min.
Further, the preparation method of the self-adhesive corona-resistant polyimide enameled wire comprises the step (4), wherein the highest temperature of the drying channel in the step (4) is 150 ℃.
Further preferably, the linear speed of the power-on wiring in the step (4) is controlled to be 20-35 m/min.
In another more specific embodiment of the present invention, there is provided a method for preparing a self-adhesive corona-resistant polyimide varnish or enameled wire, which comprises the following main steps:
(1) adding marine epoxy resin, N, N, N ', N ' -tetraglycidyl-2, 2-bis [4- (4-aminophenoxy) phenyl ] propane TGBAPP and 4,4 ' -diaminodiphenyl sulfone into a reaction kettle, stirring, heating to 70-80 ℃, stirring for reacting for 0.5-1 hour, adding CE793 epoxy resin, stirring uniformly, cooling to room temperature, adding m-xylylenediamine, and stirring uniformly at room temperature to obtain self-adhesive paint;
(2) adding aromatic binary primary amine and a strong polar aprotic organic solvent into a reaction kettle, stirring and dissolving at room temperature, adding aromatic binary anhydride, stirring and reacting at room temperature for 1-4 hours, adding inorganic nano powder treated by a coupling agent, stirring and grinding uniformly to obtain corona-resistant polyimide paint; wherein the molar ratio of the aromatic dibasic primary amine to the aromatic dibasic anhydride is 1.05-1.15: 1.00.
(3) Putting the corona-resistant polyimide paint into a paint groove of an enameled wire machine, enabling the red copper wire to pass through the paint groove for 12-18 times, passing through a high-temperature drying channel, starting up for wiring, curing at high temperature, and winding to obtain a corona-resistant polyimide enameled wire;
(4) and (3) putting the self-adhesive paint into a paint groove of an enameled wire machine, enabling the corona-resistant polyimide enameled wire to pass through the paint groove and pass through a drying channel, starting up for wiring, heating, semi-curing and rolling to obtain the self-adhesive corona-resistant polyimide enameled wire.
Wherein the aromatic dibasic primary amine and the strong polar aprotic organic solvent in the step (2) are defined as the aromatic dibasic anhydride.
And (4) controlling the linear speed of the starting-up wiring to be 1-5 m/min by controlling the highest temperature of the high-temperature drying tunnel in the step (3) to be 400 ℃.
And (4) controlling the linear speed of the starting-up wiring to be 20-35 m/min at the highest temperature of the drying tunnel in the step (4) of 150 ℃.
Interpretation of terms:
the room temperature is 20-30 ℃.
The 20% (w/w) polyamic acid solution refers to a polyamic acid solution having a concentration of 20% by mass, i.e., wherein "w/w" represents the mass%.
The preparation method of the self-adhesive corona-resistant polyimide paint and the enameled wire provided by the invention has the advantages that the operation process is simple, the environment is protected, and the self-adhesive paint system is a solvent-free system; and secondly, the product obtained by the invention has excellent comprehensive performance, is very suitable for manufacturing coil windings of high-power motors and large high-power transformers, has good application prospect, and is easy for large-scale production.
The high-temperature-resistant polyimide wire enamel provided by the invention is used as a primer, and can further improve the performances of corona resistance and the like after inorganic oxide is added. Meanwhile, a rare hydantoin epoxy resin self-adhesive paint is designed and prepared, the introduction of the self-adhesive paint can change the traditional impregnation method of the motor coil winding, and the advantages of time saving, energy saving, labor saving, environment protection and the like can be achieved.
Detailed Description
The following examples further illustrate the invention in detail, including but not limited to the scope of the claims.
Example 1
100g of marine epoxy resin, 500g of N, N, N ', N ' -tetraglycidyl-2, 2-bis [4- (4-aminophenoxy) phenyl ] propane TGBAPP and 50g of 4,4 ' -diaminodiphenyl sulfone are added into a reaction kettle, stirred, heated to 70-80 ℃, stirred and reacted for 0.5 hour, then 300g of CE793 epoxy resin is added, after uniform stirring, cooled to room temperature, 30g of m-xylylenediamine is added, and the mixture is uniformly stirred at room temperature, namely the self-adhesive paint is recorded as SA-1.
100g of marine epoxy resin, 800g of N, N, N ', N ' -tetraglycidyl-2, 2-bis [4- (4-aminophenoxy) phenyl ] propane TGBAPP and 80g of 4,4 ' -diaminodiphenyl sulfone are added into a reaction kettle, stirred, heated to 70-80 ℃, stirred for reaction for 1 hour, 600g of CE793 epoxy resin is added, after uniform stirring, cooled to room temperature, 20g of m-xylylenediamine is added, and the mixture is uniformly stirred at room temperature, namely the self-adhesive paint is recorded as SA-2.
100g of marine epoxy resin, 1000g of N, N, N ', N ' -tetraglycidyl-2, 2-bis [4- (4-aminophenoxy) phenyl ] propane TGBAPP and 100g of 4,4 ' -diaminodiphenyl sulfone are added into a reaction kettle, stirred, heated to 70-80 ℃, stirred and reacted for 0.8 hour, 800g of CE793 epoxy resin is added, after uniform stirring, cooled to room temperature, 10g of m-xylylenediamine is added, and the mixture is uniformly stirred at room temperature, namely the self-adhesive paint is recorded as SA-3.
Example 2
The self-adhesive paint of example 1 was subjected to performance tests including viscosity, adhesion, volume resistivity of cured product, dielectric loss of cured product, and breakdown field strength of cured product, and the specific test results are shown in table 1, and the test methods were as follows:
1. viscosity test
The test was carried out using a viscometer model CAP2000+ manufactured by Bohler aircraft USA, rotor number 1 being selected, temperature range 25 ℃.
2. Adhesion test
And (3) immersing the wound spiral copper wire into self-adhesive paint, curing for 1h at 180 ℃, performing adhesion force test by adopting a microcomputer control electronic universal tester, wherein each formula is used for testing three samples, and then averaging.
3. Volume resistivity test
Uniformly coating the self-adhesive paint in a circular mould with the diameter of 110mm, solidifying for 1h at 180 ℃, and naturally cooling and taking down. The resistance was measured with a ZC36 insulation resistance tester manufactured by Shanghai sixth electric Meter, Inc. at a test voltage of 1 kV.
4. Dielectric loss test
The sample with the tested volume resistivity is placed on a clamp, and a dielectric test is carried out by using an S6000-H + type dielectric loss tester of the Wuhan Huarui measurement and control technology Co., Ltd, wherein the test voltage is 1 kV.
5. Breakdown field strength test
And testing the breakdown field intensity of the sample by using an HT-50c type breakdown voltage tester, measuring the thickness of the sample at the breakdown position, and calculating the breakdown field intensity of the sample.
The test results are shown in table 1.
TABLE 1 Performance data for self-adhesive paints
Example 3
19.8g (0.1mol) of 4,4 '-diaminodiphenylmethane, 26.0g (0.13mol) of 3, 4' -diaminodiphenyl ether and 36.6g (0.1mol) of aromatic diprimary amine of 2, 2-bis (3-hydroxy-4-aminophenyl) hexafluoropropane, 400.0g of N, N-dimethylformamide and 232.8g of a strongly polar aprotic organic solvent for N-methyl-2-pyrrolidone were charged into a reaction vessel, and after stirring and dissolving at room temperature, 43.6g (0.2mol) of pyromellitic dianhydride and 32.2g (0.1mol) of aromatic dibasic anhydride of 3,3 ', 4, 4' -tetracarboxybenzophenone dianhydride were added, and after stirring and reacting at room temperature for 1 hour, 69.1g of silica inorganic nanopowder treated with 3-aminopropyltrimethoxysilane coupling agent and 10.0g of titania inorganic nanopowder treated with 3-aminopropyltrimethoxysilane coupling agent were added, the mixture was stirred and ground uniformly to obtain 870.1g of corona-resistant polyimide varnish, which was designated as CR-1.
23.0g (0.115mol) of 4,4 '-diaminodiphenyl ether, 20.0g (0.1mol) of 3, 4' -diaminodiphenyl ether, 36.6g (0.1mol) of aromatic diprimary amine of 2, 2-bis (3-hydroxy-4-aminophenyl) hexafluoropropane, 616.8g of N, N-dimethylacetamide strongly polar aprotic organic solvent were added to a reaction vessel, stirred and dissolved at room temperature, 43.6g (0.2mol) of pyromellitic dianhydride and 31.0g (0.1mol) of aromatic dibasic anhydride of 3,3 ', 4, 4' -tetracarboxydiphenyl ether dianhydride were added, stirred and reacted at room temperature for 4 hours, 13.2 g of 3-aminopropyltriethoxysilane coupling agent-treated silica inorganic nanopowder and 10.0g of 3-aminopropyltriethoxysilane coupling agent-treated alumina inorganic nanopowder were added, the mixture was stirred and ground uniformly to obtain 794.2g of corona-resistant polyimide varnish, which was designated as CR-2.
Adding 29.2g (0.1mol) of 1, 3-bis (4-aminophenoxy) benzene, 49.0g (0.245mol) of aromatic diprimary amine of 3,4 ' -diaminodiphenyl ether and 689.6g of N-methyl-2-pyrrolidone strong polar aprotic organic solvent into a reaction kettle, stirring and dissolving at room temperature, adding 62.0g (0.2mol) of 3,3 ', 4,4 ' -tetracarboxydiphenyl ether dianhydride and 32.2g (0.1mol) of aromatic dibasic anhydride of 3,3 ', 4,4 ' -tetracarboxydibenzophenone dianhydride, stirring and reacting for 3 hours at room temperature, adding 53.1g of silica inorganic nano-powder treated by 3-aminopropyltrimethoxysilane coupling agent and 50.2g of ferric oxide inorganic nano-powder treated by 3-aminopropyltrimethoxysilane coupling agent, stirring and grinding uniformly to obtain 965.3g of corona resistant polyimide paint, denoted as CR-3.
Example 4
The corona-resistant polyimide paint film of example 3 (curing process: starting to raise the room temperature to 100 ℃, keeping for 1 hour, continuing to raise the temperature to 200 ℃, keeping for 1 hour, continuing to raise the temperature to 300 ℃, keeping for 1 hour, naturally cooling to room temperature) was subjected to performance tests including volume resistivity, dielectric loss, breakdown field strength, and corona resistance, and the specific test results are shown in table 2, and the test method was as follows:
1. volume resistivity test
The cured paint film copper sheet is tested under the condition of 1kV by adopting a ZC-90G high insulation resistance measuring instrument produced by Shanghai TaiEuro electronics Limited company, and the thickness of a sample is measured.
2. Dielectric loss test
The sample was cut into a shape of 2cm in length and width, and then tested by using an automatic element analyzer model TH2828S manufactured by Yokogaku, Changzhou city.
3. Breakdown field strength test
Under the action of an applied electric field, the insulating material loses its insulating properties due to the phenomenon of short-circuiting between the electrodes, known as dielectric breakdown. The voltage at which the insulating material breaks down is called the breakdown voltage, and the breakdown field strength is the ratio of the breakdown voltage to the dielectric thickness.
The cured paint film copper sheet was tested using an automatic high voltage breakdown device model CW2672H from changzhou micro special electric machinery general works.
4. Corona resistance test
Corona resistance time refers to the time that occurs from corona discharge of an insulating material to the time the material is broken down. The corona resistance life of a material is related to factors such as frequency, temperature, electric field strength and the like besides the self-reason.
In the experiment, an JGM-3F high-frequency pulse voltage tester produced by Shanghai Shenfa detection instrument Limited is adopted to test the corona resistance of the prepared paint film. And (3) testing conditions are as follows: temperature: room temperature; pulse frequency: 20 kHz; duty ratio of pulse: 50 percent; peak pulse voltage: 2.5 kV.
The test results are shown in table 2.
TABLE 2 corona resistant polyimide film Performance data
Example 5
Respectively putting the corona-resistant polyimide paints CR-1, CR-2 and CR-3 obtained in the embodiment 3 into a paint groove of an enameled wire machine, enabling red copper wires to pass through the paint groove for 12-18 times, passing through a high-temperature drying channel, starting up and routing, respectively setting the linear speeds to be 1m/min, 3m/min and 5m/min, curing at high temperature, and rolling at the highest temperature of 400 ℃ to respectively obtain corona-resistant polyimide enameled wires ECR-1, ECR-2 and ECR-3.
Respectively putting the self-adhesive paints SA-1, SA-2 and SA-3 of the embodiment 1 into a paint groove of an enameled wire machine, respectively and sequentially passing corona-resistant polyimide enameled wires ECR-1, ECR-2 and ECR-3 through the paint groove, passing through a drying channel, starting up and wiring, respectively, wherein the linear speeds are respectively 20m/min, 30m/min and 35m/min, heating and semi-curing are carried out, the highest temperature is 150 ℃, and rolling is carried out, so that the self-adhesive corona-resistant polyimide enameled wires SECR-1, SECR-2 and SECR-3 are respectively obtained.
The following methods were used for performance testing, and the specific test data are shown in table 3:
1. paint film thickness test
The diameter of the enameled wire is tested by a micrometer produced by Deqingshengtai electronic technology Limited.
2. Elongation test
The elongation of the enameled wire is tested by using an SC-5B type elongation tensile tester produced by Xinxiong instruments Co., Ltd until the pattern is broken.
3. Round bar winding test
The enameled wire is wound by a JR-16A type enameled round wire winding tester produced by aerospace technologies, and whether the number of preset turns is reached or not is observed.
4. Breakdown voltage test
The voltage of the enameled wire is tested by an automatic ZDS-50B voltage tester produced by aerospace technologies, and the lower voltage is recorded after the pattern is broken down.
5. Corona resistance test
The method comprises the following steps of carrying out corona resistance test on the enameled wire by adopting an JGM-3F type high-frequency pulse insulation tester produced by Shanghai development detecting instrument company Limited, wherein the test conditions are as follows: and (3) testing conditions are as follows: temperature: 155 ℃; pulse frequency: 20 kHz; duty ratio of pulse: 50 percent; peak pulse voltage: 3.0 kV.
6. Scratch resistance test
The method comprises the steps of testing the enameled wires by adopting a ZDG-25 type intelligent unidirectional paint scraping tester produced by aerospace science and technology limited, placing the enameled wires according to the steps, and then setting a certain load to carry out the scraping force test.
7. Snap test
The enameled wire is placed according to the steps by adopting a J L D-10 type snap-off tester produced by Xinxiong instruments Limited company, and a snap-off test is carried out when a barometer reaches 0.7-0.8 MPa.
TABLE 3 Performance test data for enameled wires
Claims (11)
1. The self-adhesive paint is characterized by comprising marine epoxy resin, N, N, N ', N ' -tetraglycidyl-2, 2-bis [4- (4-aminophenoxy) phenyl ] propane TGBAPP, CE793 epoxy resin, 4 ' -diaminodiphenyl sulfone and m-xylylenediamine in a mass ratio of 1: 5-10: 3-8: 0.5-1: 0.1-0.3.
2. The self-adhesive paint according to claim 1, wherein the marine epoxy resin has a structural formula of:
3. a method of preparing a self-adhesive paint according to any one of claims 1 to 2, comprising:
adding marine epoxy resin, N, N, N ', N ' -tetraglycidyl-2, 2-bis [4- (4-aminophenoxy) phenyl ] propane TGBAPP and 4,4 ' -diaminodiphenyl sulfone into a reaction kettle, stirring, heating to 70-80 ℃, stirring for reacting for 0.5-1 hour, adding CE793 epoxy resin, stirring uniformly, cooling to room temperature, adding m-xylylenediamine, and stirring uniformly at room temperature to obtain the self-adhesive paint.
4. The corona-resistant polyimide paint is characterized by consisting of 20% (w/w) of polyamic acid solution and inorganic nano powder treated by a coupling agent, wherein the mass ratio of the 20% (w/w) polyamic acid solution to the inorganic nano powder treated by the coupling agent is 100: 3-12.
5. The corona resistant polyimide paint of claim 4, wherein the coupling agent is selected from one or more of 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, glycidoxypropyltrimethoxysilane, and glycidoxypropyltriethoxysilane.
6. The corona-resistant polyimide paint as claimed in claim 4, wherein the inorganic nano powder is one or more selected from nano alumina powder, nano silica powder, nano titania powder, nano iron oxide powder and nano magnesia powder.
7. A method of preparing a corona resistant polyimide paint as claimed in any one of claims 4 to 6, comprising:
adding aromatic binary primary amine and a strong polar aprotic organic solvent into a reaction kettle, stirring and dissolving at room temperature, adding aromatic binary anhydride, stirring and reacting at room temperature for 1-4 hours, adding inorganic nano powder treated by a coupling agent, stirring and grinding uniformly to obtain corona-resistant polyimide paint; wherein the molar ratio of the aromatic dibasic primary amine to the aromatic dibasic anhydride is 1.05-1.15: 1.00.
8. The method for preparing a corona resistant polyimide varnish as recited in claim 7, wherein said aromatic diamine primary diamine is selected from the group consisting of p-phenylenediamine, m-phenylenediamine, o-phenylenediamine, trimethyl-m-phenylenediamine, o-methyl-p-phenylenediamine, 4 ' -diaminodiphenylmethane, 3 ' -dimethyl-4, 4 ' -diamino-5, 5 ' -diethyldiphenylmethane, 3 ', 5,5 ' -tetramethyl-4, 4 ' -diaminodiphenylmethane, 3 ' -diaminodiphenylmethane, 4 ' -diaminodiphenyl ether, 3 ' -diaminodiphenyl ether, 4 ' -diaminobenzophenone, 4 ' -diaminodiphenyl ether, 3 ' -diaminodiphenyl ether, and mixtures thereof, 4,4 ' -diaminodiphenyl sulfone, 3 ' -diaminodiphenyl sulfone, 4 ' -diaminodiphenyl sulfide, 4 ' -diaminobiphenyl, 2 ' -dimethyl-4, 4 ' -diaminobiphenyl, 2 ' -bis (trifluoromethyl) -4,4 ' -diaminobiphenyl, 1, 4-bis (4-aminophenoxy) benzene, 1, 4-bis (3-aminophenoxy) benzene, 1, 3-bis (4-aminophenoxy) benzene, 1, 3-bis (3-aminophenoxy) benzene, 1, 4-bis (2-trifluoromethyl-4-aminophenoxy) benzene, 1, 3-bis (2-trifluoromethyl-4-aminophenoxy) benzene, 4 ' -bis (4-aminophenoxy) biphenyl, and mixtures thereof, 4,4 '-bis (2-trifluoromethyl-4-aminophenoxy) biphenyl, 4' -bis (3-aminophenoxy) biphenyl, 4 '-bis (4-aminophenoxy) -3, 3', 5,5 '-tetramethylbiphenyl, 4' -bis (2-trifluoromethyl-4-aminophenoxy) -3,3 ', 5, 5' -tetramethylbiphenyl, 4 '-bis (3-aminophenoxy) -3, 3', 5,5 '-tetramethylbiphenyl, 4' -bis (4-aminophenoxy) diphenyl ether, 4 '-bis (2-trifluoromethyl-4-aminophenoxy) diphenyl ether, 4' -bis (3-aminophenoxy) diphenyl ether, 4,4 ' -bis (4-aminophenoxy) diphenyl sulfide, 4 ' -bis (2-trifluoromethyl-4-aminophenoxy) diphenyl sulfide, 4 ' -bis (3-aminophenoxy) diphenyl sulfide, 4 ' -bis (4-aminophenoxy) diphenyl sulfone, 4 ' -bis (2-trifluoromethyl-4-aminophenoxy) diphenyl sulfone, 4 ' -bis (3-aminophenoxy) diphenyl sulfone, 4 ' -bis (4-aminophenoxy) benzophenone, 4 ' -bis (2-trifluoromethyl-4-aminophenoxy) benzophenone, 4 ' -bis (3-aminophenoxy) benzophenone, 4 ' -bis (4-aminophenoxy) diphenylmethane, 4 ' -bis (4-aminophenoxy) diphenyl sulfide, 4 ' -bis (2-aminophenoxy) diphenyl sulfone, 4 ' -bis (4-, 4,4 '-bis (2-trifluoromethyl-4-aminophenoxy) diphenylmethane, 4' -bis (3-aminophenoxy) diphenylmethane, 2-bis [4- (4-aminophenoxy) phenyl ] propane, 2-bis [4- (2-trifluoromethyl-4-aminophenoxy) phenyl ] propane, 2-bis [4- (3-aminophenoxy) phenyl ] propane, 2-bis [4- (4-aminophenoxy) phenyl ] hexafluoropropane, 2-bis [4- (2-trifluoromethyl-4-aminophenoxy) phenyl ] hexafluoropropane, 2-bis [4- (3-aminophenoxy) phenyl ] hexafluoropropane, 2- (4-aminophenyl) -5-aminobenzimidazole, 4 '-diamino-4' -hydroxytriphenylmethane, 2-bis (3-hydroxy-4-aminophenyl) propane, 2-bis (3-hydroxy-4-aminophenyl) hexafluoropropane, 3, 5-diaminobenzoic acid and/or 3, 5-bis (4-aminophenoxy) benzoic acid.
9. The method of claim 7, wherein the aromatic dicarboxylic anhydride is selected from the group consisting of pyromellitic dianhydride, 3 ', 4,4 ' -tetracarboxylic benzophenone dianhydride, 3 ', 4,4 ' -tetracarboxylic diphenyl ether dianhydride, 3 ', 4,4 ' -tetracarboxylic diphenyl sulfone dianhydride, 3 ', 4,4 ' -tetracarboxylic biphenyl dianhydride, 1, 4-bis (3, 4-dicarboxyphenoxy) benzene dianhydride, 1, 3-bis (3, 4-dicarboxyphenoxy) benzene dianhydride, 4,4 ' -bis (3, 4-dicarboxyphenoxy) diphenyl sulfone dianhydride, 4,4 ' -bis (3, 4-dicarboxyphenoxy) benzophenone dianhydride, 4,4 ' -bis (3, 4-dicarboxyphenoxy) diphenyl ether dianhydride, and mixtures thereof, 4, 4' -bis (3, 4-dicarboxyphenoxy) biphenyl dianhydride, 2-bis [4- (3, 4-dicarboxyphenoxy) phenyl ] propane dianhydride, 2-bis [4- (3, 4-dicarboxyphenoxy) phenyl ] hexafluoropropane dianhydride and one or more of 2, 2-bis (3, 4-dicarboxyphenyl) hexafluoropropane dianhydride.
10. The method for preparing corona-resistant polyimide paint as claimed in claim 7, wherein the strongly polar aprotic organic solvent is selected from one or more of N, N-dimethylformamide, N-dimethylacetamide, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, and dimethylsulfoxide.
11. Use of the self-adhesive varnish according to claim 1 or the corona-resistant polyimide varnish according to claim 4 for the production of self-adhesive corona-resistant polyimide varnishes or self-adhesive corona-resistant polyimide varnishes.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010245585.9A CN111393949A (en) | 2020-03-31 | 2020-03-31 | Self-adhesive paint, corona-resistant polyimide paint and preparation method thereof |
| PCT/CN2020/111014 WO2021196512A1 (en) | 2020-03-31 | 2020-08-25 | Self-bonding paint, corona-resistant polyimide paint and preparation method therefor |
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| CN202010245585.9A CN111393949A (en) | 2020-03-31 | 2020-03-31 | Self-adhesive paint, corona-resistant polyimide paint and preparation method thereof |
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| CN111393949A true CN111393949A (en) | 2020-07-10 |
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| CN202010245585.9A Pending CN111393949A (en) | 2020-03-31 | 2020-03-31 | Self-adhesive paint, corona-resistant polyimide paint and preparation method thereof |
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| WO (1) | WO2021196512A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021196512A1 (en) * | 2020-03-31 | 2021-10-07 | 苏州巨峰电气绝缘***股份有限公司 | Self-bonding paint, corona-resistant polyimide paint and preparation method therefor |
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| CN103773302B (en) * | 2014-02-14 | 2016-01-06 | 东华大学 | A kind of single-component halogen-free flameproof epoxy adhesive and preparation method thereof |
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| WO2021196512A1 (en) | 2021-10-07 |
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