WO2020088429A1 - 一种电子变压器用的水性绝缘漆及其制备方法和应用 - Google Patents

一种电子变压器用的水性绝缘漆及其制备方法和应用 Download PDF

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WO2020088429A1
WO2020088429A1 PCT/CN2019/113861 CN2019113861W WO2020088429A1 WO 2020088429 A1 WO2020088429 A1 WO 2020088429A1 CN 2019113861 W CN2019113861 W CN 2019113861W WO 2020088429 A1 WO2020088429 A1 WO 2020088429A1
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water
based insulating
insulating varnish
anhydride
diisocyanate
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English (en)
French (fr)
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井丰喜
吴斌
顾建峰
张明玉
张春琪
景录如
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苏州太湖电工新材料股份有限公司
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C09D175/06—Polyurethanes from polyesters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/0804—Manufacture of polymers containing ionic or ionogenic groups
    • C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
    • C08G18/0823—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups containing carboxylate salt groups or groups forming them
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3271—Hydroxyamines
    • C08G18/3278—Hydroxyamines containing at least three hydroxy groups
    • C08G18/3281—Hydroxyamines containing at least three hydroxy groups containing three hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
    • C08G18/348—Hydroxycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/4205—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups
    • C08G18/4208—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups containing aromatic groups
    • C08G18/4211—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups containing aromatic groups derived from aromatic dicarboxylic acids and dialcohols
    • C08G18/4219—Polycondensates having carboxylic or carbonic ester groups in the main chain containing cyclic groups containing aromatic groups derived from aromatic dicarboxylic acids and dialcohols from aromatic dicarboxylic acids and dialcohols in combination with polycarboxylic acids and/or polyhydroxy compounds which are at least trifunctional
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6633—Compounds of group C08G18/42
    • C08G18/6659—Compounds of group C08G18/42 with compounds of group C08G18/34
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/73—Polyisocyanates or polyisothiocyanates acyclic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds
    • C08G63/20—Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78—Preparation processes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • 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
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/65—Additives macromolecular

Definitions

  • the invention belongs to the field of insulating impregnating varnish for electrical equipment, and particularly relates to a water-based insulating varnish for electronic transformers and a preparation method and application thereof.
  • the technical problem to be solved by the present invention is to overcome the shortcomings in the prior art, and to provide an improved water-based insulating paint for electronic transformers, which can prevent the electronic transformer impregnated with the water-based insulating paint from first performing at a high temperature of about 400 ° C.
  • Secondary solder but can be given to the solder conductive properties at the working temperature of the plug-in circuit board (about 200 °C), which can be applied to the plug-in circuit board, not only simplifies the process steps, but also saves energy.
  • the invention also provides a method for preparing water-based insulating paint for electronic transformers.
  • the invention also provides an application of the water-based insulating paint for the electronic transformer in the impregnation of the electronic transformer.
  • a water-based insulating paint for electronic transformers The raw materials of the water-based insulating paint include polyol, acid anhydride, neutralizer, cosolvent, water-based curing agent and water.
  • the polyol is composed of glycerin and neopentyl glycol.
  • the acid anhydride is composed of phthalic anhydride and trimellitic anhydride, and the raw materials further include diisocyanate and chain extender;
  • the water-based insulating paint is prepared by the following method: the glycerin and the neopentyl glycol ⁇
  • the phthalic anhydride and the trimellitic anhydride are mixed to produce polycondensation reaction to prepare a hydroxyl-terminated hyperbranched polyester, react the hydroxyl-terminated hyperbranched polyester with the diisocyanate, and then add the neutralizer,
  • the co-solvent, the chain extender and the water are reacted, the water-based curing agent is added, and the water-based insulating varnish for the electronic transformer is prepared by mixing.
  • the feeding molar ratio of the glycerin to the neopentyl glycol is 2.5-3.5: 1.
  • the feeding molar ratio of the phthalic anhydride to the trimellitic anhydride is 6.5-7.5: 1.
  • the feeding molar ratio of the polyol to the acid anhydride is 0.65-0.8: 1.
  • the polyol in terms of mass percentage, in the raw material, the polyol accounts for 15-20%, the acid anhydride accounts for 35-42%, and the diisocyanate accounts for 1-8%.
  • the chain extender accounts for 1-5%, the neutralizer accounts for 0.5-3%, the cosolvent accounts for 2-10%, the aqueous curing agent accounts for 2-15%, and the water accounts for 15-40% .
  • the acid value of the hydroxyl-terminated hyperbranched polyester prepared by control is less than or equal to 20 mgKOH / g.
  • the polycondensation reaction is controlled to be carried out at 180-200 ° C.
  • the reaction of the hydroxyl-terminated hyperbranched polyester and the diisocyanate is controlled to be carried out at 75-85 ° C.
  • the neutralizing agent is triethanolamine.
  • the co-solvent is propylene glycol methyl ether.
  • the aqueous curing agent is a highly methylated melamine formaldehyde resin.
  • the diisocyanate is 1,6-hexane diisocyanate or diphenylmethane diisocyanate.
  • the chain extender is 2,2-dimethylolpropionic acid.
  • the glycerin, the neopentyl glycol, the phthalic anhydride, and the trimellitic anhydride are mixed to produce a polycondensation reaction to prepare a hydroxyl-terminated hyperbranched polyester.
  • the diisocyanate is reacted, and then the neutralizer, the co-solvent, the chain extender and the water are added, reacted, the aqueous curing agent is added, and the aqueous insulating paint for the electronic transformer is prepared by mixing.
  • Another technical solution provided by the present invention an application of the above-mentioned water-based insulating paint for electronic transformers in impregnating electronic transformers.
  • the present invention has the following advantages compared with the prior art:
  • the water-based insulating paint of the invention is made into a hydroxyl-terminated hyperbranched polyester by using a specific compound polyol and a compound acid anhydride, and then modified with a diisocyanate, then a chain extender is added to extend the chain, and a neutralizer is added at the same time
  • the raw material is made into water-based insulating paint, which is applied to the impregnation of electrical transformers, which solves the need in the prior art to conduct the second soldering of the electronic transformer after impregnating the insulating paint at a high temperature of about 400 °C to give it conductivity, and It can be applied to the problem of subsequent plug-in circuit boards, and the present invention can make the electronic transformer impregnated with water-based insulating paint free from the first secondary soldering at a high temperature of about 400 °C, but can directly work at the working temperature of the plug-in circuit board ( At about 200 °C) to give its solder conductive properties, which can be applied to plug circuit
  • the water-based insulating paint of the present invention has good water resistance, overcomes the problem of hydrolysis caused by long-term storage in the prior art, has a low baking temperature, and also improves the mechanical and electrical properties of the water-based insulating paint.
  • This embodiment provides a water-based insulating varnish for electronic transformers.
  • the raw materials include 100g of glycerin, 40g of neopentyl glycol, 265g of phthalic anhydride, 50g of trimellitic anhydride, 35g of 1,6-hexanediisocyanate, and 2,2. -28 g of dimethylolpropionic acid, 15 g of triethanolamine, 40 g of propylene glycol methyl ether, 55 g of melamine formaldehyde resin, and 200 g of water.
  • the preparation method is as follows: In a three-necked flask, add glycerol, neopentyl glycol, phthalic anhydride, trimellitic anhydride, temperature control 180 ⁇ 200 °C, polycondensation reaction occurs, until the acid value ⁇ 20mgKO / H, prepared Hydroxyl-terminated hyperbranched polyester, cool to 80 °C, add 1,6-hexanediisocyanate dropwise, add 2,2-dimethylolpropionic acid, triethanolamine, propylene glycol methyl ether and water after 2 hours of heat preservation, and react for 2 hours , The temperature is reduced to 50 °C, add water-based curing agent, mix well, that is to make the water-based insulating paint for the electronic transformer.
  • This embodiment provides a water-based insulating varnish for electronic transformers.
  • the raw materials include 105g of glycerin, 40g of neopentyl glycol, 296g of phthalic anhydride, 55g of trimellitic anhydride, 35g of 1,6-hexanediisocyanate, and 2,2. -30 g of dimethylolpropionic acid, 15 g of triethanolamine, 40 g of propylene glycol methyl ether, 60 g of melamine formaldehyde resin, and 230 g of water.
  • the preparation method is also Example 1.
  • This embodiment provides a water-based insulating varnish for electronic transformers, the raw materials of which include glycerin 100g, neopentyl glycol 45g, phthalic anhydride 265g, trimellitic anhydride 50g, diphenylmethane diisocyanate 52g, 2,2- Dimethylolpropionic acid 28g, triethanolamine 20g, propylene glycol methyl ether 50g, melamine formaldehyde resin 55g, water 210g.
  • glycerin 100g neopentyl glycol 45g, phthalic anhydride 265g, trimellitic anhydride 50g, diphenylmethane diisocyanate 52g, 2,2- Dimethylolpropionic acid 28g, triethanolamine 20g, propylene glycol methyl ether 50g, melamine formaldehyde resin 55g, water 210g.
  • the preparation method is also Example 1.
  • Example 2 It is basically the same as Example 1, except that diphenylmethane diisocyanate is replaced with an equivalent molar amount of rosin acid.
  • Example 2 It is basically the same as Example 1, except that glycerin is not added, and the addition amount of neopentyl glycol is adjusted accordingly to 153 g.
  • Example 2 It is basically the same as Example 1, except that trimellitic anhydride is not added, and the addition amount of phthalic anhydride is adjusted accordingly to 303 g.
  • the electrical transformer was immersed in the insulating varnish prepared in the above Examples 1-3 and Comparative Examples 1-3, and the performance parameters of the cured coating film formed were shown in Table 1, and the Examples 1-3 and Comparative Example 1-3 Whether the electronic transformer obtained after immersion needs to be re-soldered first at a high temperature of about 400 °C, and then can it be directly applied to a plug-in circuit board (need to be re-soldered at a high temperature of about 400 °C, and then (Applied to plug-in circuit board is indicated by "need", on the contrary, it is indicated by "not required”).

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Abstract

一种电子变压器用的水性绝缘漆、其制备方法及在浸渍电子变压器中的应用，该绝缘漆的原料包括多元醇、酸酐、中和剂、助溶剂、水性固化剂、水、二异氰酸酯和扩链剂，多元醇由丙三醇和新戊二醇构成，酸酐由邻苯二甲酸酐和偏苯三酸酐构成。通过使丙三醇、新戊二醇、邻苯二甲酸酐和偏苯三酸酐混合发生缩聚反应，制得端羟基超支化聚酯，使端羟基超支化聚酯和二异氰酸酯反应，再加入中和剂、助溶剂、扩链剂和水，反应，加入水性固化剂，混合制得。该绝缘漆能够使得浸渍水性绝缘漆的电子变压器免于在400℃左右高温下先行进行二次焊锡，并能够在插接电路板的工作温度下赋予其焊锡导电特性，进而能够应用于插接电路板，精简了工艺步骤，且节约了能源。

Description

一种电子变压器用的水性绝缘漆及其制备方法和应用
本申请要求2018年10月29日向中国国家知识产权局递交的申请号为201811266765.4的发明专利申请的优先权，该优先权文本内容明确通过援引加入并入本申请中。
技术领域
本发明属于电气设备的绝缘浸渍漆领域，具体涉及一种电子变压器用的水性绝缘漆及其制备方法和应用。
背景技术
目前，市场上电子变压器在浸渍绝缘漆后需要二次焊锡，而市面上的大部分水性绝缘漆并不能满足二次焊锡要求，针对上述水性漆不能二次焊锡难题，中国发明专利CN105348502B公开了一种水性绝缘漆及其制备方法，然而此专利虽然可赋予水性漆二次焊锡特性，但是却需要将浸渍绝缘漆后的电子变压器在400℃左右高温下先行进行二次焊锡，赋予其导电性，进而才能应用在后续插接电路板(工作温度约200℃)的工艺中，能耗较高，不利于节约能源，且增加了生产工序，提高了生产成本。
发明内容
本发明所要解决的技术问题是克服现有技术中的不足，提供一种改进的电子变压器用的水性绝缘漆，其能够使得浸渍水性绝缘漆的电子变压器免于在400℃左右高温下先行进行二次焊锡，而是能够在插接电路板的工作温度(约200℃)下赋予其焊锡导电特性，进而能够应用于插接电路板，不仅精简了工艺步骤，而且还节约了能源。
本发明还提供了一种电子变压器用的水性绝缘漆的制备方法。
本发明同时还提供了一种电子变压器用的水性绝缘漆在浸渍电子变压器中的应用。
为解决以上技术问题，本发明采取的一种技术方案如下：
一种电子变压器用的水性绝缘漆，所述水性绝缘漆的原料包括多元醇、酸酐、中和剂、助溶剂、水性固化剂和水，所述多元醇由丙三醇和新戊二醇构成，所述酸酐由邻苯二甲酸酐和偏苯三酸酐构成，所述原料还包括二异氰酸酯和扩 链剂；所述水性绝缘漆通过如下方法制备而得：使所述丙三醇、所述新戊二醇、所述邻苯二甲酸酐和所述偏苯三酸酐混合发生缩聚反应，制得端羟基超支化聚酯，使所述端羟基超支化聚酯和所述二异氰酸酯反应，再加入所述中和剂、所述助溶剂、所述扩链剂和所述水，反应，加入所述水性固化剂，混合制得所述电子变压器用的水性绝缘漆。
根据本发明的一些优选方面，所述丙三醇与所述新戊二醇的投料摩尔比为2.5-3.5︰1。
根据本发明的一些优选方面，所述邻苯二甲酸酐与所述偏苯三酸酐的投料摩尔比为6.5-7.5︰1。
根据本发明的一些优选方面，所述多元醇与所述酸酐的投料摩尔比为0.65-0.8︰1。
根据本发明的一些优选方面，以质量百分含量计，所述原料中，所述多元醇占15-20％、所述酸酐占35-42％、所述二异氰酸酯占1-8％、所述扩链剂占1-5％、所述中和剂占0.5-3％、所述助溶剂占2-10％、所述水性固化剂占2-15％和所述水占15-40％。
根据本发明的一些优选方面，所述水性绝缘漆的制备方法中，控制制得的所述端羟基超支化聚酯的酸值小于等于20mgKOH/g。
根据本发明的一些优选方面，控制所述缩聚反应在180-200℃下进行。
根据本发明的一些优选方面，所述水性绝缘漆的制备方法中，控制所述端羟基超支化聚酯和所述二异氰酸酯的反应在75-85℃下进行。
根据本发明的一些具体且优选的方面，所述中和剂为三乙醇胺。
根据本发明的一些具体且优选的方面，所述助溶剂为丙二醇甲醚。
根据本发明的一些具体且优选的方面，所述水性固化剂为高甲醚化三聚氰胺甲醛树脂。
根据本发明的一些具体且优选的方面，所述二异氰酸酯为1,6-己二异氰酸酯或二苯基甲烷二异氰酸酯。
根据本发明的一些优选方面，所述扩链剂为2,2-二羟甲基丙酸。
本发明提供的又一技术方案：一种上述所述的电子变压器用的水性绝缘漆的制备方法，所述制备方法为：
使所述丙三醇、所述新戊二醇、所述邻苯二甲酸酐和所述偏苯三酸酐混合发生缩聚反应，制得端羟基超支化聚酯，使所述端羟基超支化聚酯和所述二异氰酸酯反应，再加入所述中和剂、所述助溶剂、所述扩链剂和所述水，反应，加入所述水性固化剂，混合制得所述电子变压器用的水性绝缘漆。
本发明提供的又一技术方案：一种上述所述的电子变压器用的水性绝缘漆在浸渍电子变压器中的应用。
由于以上技术方案的采用，本发明与现有技术相比具有如下优点：
本发明的水性绝缘漆通过采用特定的复配多元醇与复配酸酐反应制成端羟基超支化聚酯，再采用二异氰酸酯进行改性，然后加入扩链剂扩链，同时加入中和剂等原料，制成水性绝缘漆，将其应用于浸渍电气变压器后，解决了现有技术中需要将浸渍绝缘漆后的电子变压器在400℃左右高温下先行进行二次焊锡，赋予其导电性，进而才能应用在后续插接电路板的问题，而本发明能够使得浸渍水性绝缘漆的电子变压器免于在400℃左右高温下先行进行二次焊锡，而是能够直接在插接电路板的工作温度(约200℃)下赋予其焊锡导电特性，进而能够应用于插接电路板，不仅精简了工艺步骤，而且还节约了能源。
同时本发明的水性绝缘漆耐水性好，克服了现有技术中长期存放而产生水解的问题，烘烤温度低，同时还提升了水性绝缘漆的机械性能和电性能。
具体实施方式
以下结合具体实施例对上述方案做进一步说明；应理解，这些实施例是用于说明本发明的基本原理、主要特征和优点，而本发明不受以下实施例的范围限制；实施例中采用的实施条件可以根据具体要求做进一步调整，未注明的实施条件通常为常规实验中的条件。
下述中，如无特殊说明，所有的原料均来自于商购或者通过本领域的常规方法制备而得。
实施例1
本实施例提供一种电子变压器用的水性绝缘漆，其原料包括丙三醇100g、新戊二醇40g、邻苯二甲酸酐265g、偏苯三酸酐50g、1,6-己二异氰酸酯35g、2,2-二羟甲基丙酸28g、三乙醇胺15g、丙二醇甲醚40g、三聚氰胺甲醛树脂55g、水200g。
其制备方法为：在三口烧瓶中，加入丙三醇，新戊二醇，邻苯二甲酸酐，偏苯三酸酐，控温180～200℃，发生缩聚反应，直至酸值≤20mgKO H/g，制得端羟基超支化聚酯，降温至80℃，滴加1,6-己二异氰酸酯，保温2h后加入2,2-二羟甲基丙酸、三乙醇胺、丙二醇甲醚和水，保温反应2小时，降温至50℃加入水性固化剂，混匀，即制成所述电子变压器用的水性绝缘漆。
实施例2
本实施例提供一种电子变压器用的水性绝缘漆，其原料包括丙三醇105g、新戊二醇40g、邻苯二甲酸酐296g、偏苯三酸酐55g、1,6-己二异氰酸酯35g、2,2-二羟甲基丙酸30g、三乙醇胺15g、丙二醇甲醚40g、三聚氰胺甲醛树脂60g、水230g。
其制备方法同时实例1。
实施例3
本实施例提供一种电子变压器用的水性绝缘漆，其原料包括丙三醇100g、新戊二醇45g、邻苯二甲酸酐265g、偏苯三酸酐50g、二苯基甲烷二异氰酸酯52g、2,2-二羟甲基丙酸28g、三乙醇胺20g、丙二醇甲醚50g、三聚氰胺甲醛树脂55g、水210g。
其制备方法同时实例1。
对比例1
基本同实施例1，其区别仅在于将二苯基甲烷二异氰酸酯替换为同等摩尔量的松香酸。
对比例2
基本同实施例1，其区别仅在于不加丙三醇，相应调整新戊二醇的添加量为153g。
对比例3
基本同实施例1，其区别仅在于不加偏苯三酸酐，相应调整邻苯二甲酸酐的添加量为303g。
性能测试
将电气变压器浸渍于上述实施例1-3以及对比例1-3所制得的绝缘漆中，测得形成的固化涂膜的性能参数如表1所示，以及测试本实施例1-3以及对比例1-3浸渍后得到的电子变压器是否需要在400℃左右高温下先行进行二次焊锡， 进而可否直接应用于插接电路板(需要在400℃左右高温下先行进行二次焊锡，进而才能应用于插接电路板以“需要”表示，相反，则以“不需要”表示)。
表1
Figure PCTCN2019113861-appb-000001
上述实施例只为说明本发明的技术构思及特点，其目的在于让熟悉此项技术的人士能够了解本发明的内容并据以实施，并不能以此限制本发明的保护范围，凡根据本发明精神实质所作的等效变化或修饰，都应涵盖在本发明的保护范围之内。

Claims (10)

  1. 一种电子变压器用的水性绝缘漆，所述水性绝缘漆的原料包括多元醇、酸酐、中和剂、助溶剂、水性固化剂和水，其特征在于，所述多元醇由丙三醇和新戊二醇构成，所述酸酐由邻苯二甲酸酐和偏苯三酸酐构成，所述原料还包括二异氰酸酯和扩链剂；所述水性绝缘漆通过如下方法制备而得：使所述丙三醇、所述新戊二醇、所述邻苯二甲酸酐和所述偏苯三酸酐混合发生缩聚反应，制得端羟基超支化聚酯，使所述端羟基超支化聚酯和所述二异氰酸酯反应，再加入所述中和剂、所述助溶剂、所述扩链剂和所述水，反应，加入所述水性固化剂，混合制得所述电子变压器用的水性绝缘漆。
  2. 根据权利要求1所述的电子变压器用的水性绝缘漆，其特征在于，所述丙三醇与所述新戊二醇的投料摩尔比为2.5-3.5︰1；和/或，所述邻苯二甲酸酐与所述偏苯三酸酐的投料摩尔比为6.5-7.5︰1。
  3. 根据权利要求1所述的电子变压器用的水性绝缘漆，其特征在于，所述多元醇与所述酸酐的投料摩尔比为0.65-0.8︰1。
  4. 根据权利要求1所述的电子变压器用的水性绝缘漆，其特征在于，以质量百分含量计，所述原料中，所述多元醇占15-20％、所述酸酐占35-42％、所述二异氰酸酯占1-8％、所述扩链剂占1-5％、所述中和剂占0.5-3％、所述助溶剂占2-10％、所述水性固化剂占2-15％和所述水占15-40％。
  5. 根据权利要求1所述的电子变压器用的水性绝缘漆，其特征在于，所述水性绝缘漆的制备方法中，控制制得的所述端羟基超支化聚酯的酸值小于等于20mgKOH/g；和/或，控制所述缩聚反应在180-200℃下进行。
  6. 根据权利要求1所述的电子变压器用的水性绝缘漆，其特征在于，所述水性绝缘漆的制备方法中，控制所述端羟基超支化聚酯和所述二异氰酸酯的反应在75-85℃下进行。
  7. 根据权利要求1所述的电子变压器用的水性绝缘漆，其特征在于，所述中和剂为三乙醇胺；和/或二甲基乙醇胺，所述助溶剂为丙二醇甲醚；和/或乙二醇丁醚，所述水性固化剂为高甲醚化三聚氰胺甲醛树脂。
  8. 根据权利要求1所述的电子变压器用的水性绝缘漆，其特征在于，所述二异氰酸酯为1,6-己二异氰酸酯或二苯基甲烷二异氰酸酯；和/或，所述扩链剂为2,2-二羟甲基丙酸。
  9. 一种权利要求1-8中任一项权利要求所述的电子变压器用的水性绝缘漆的制备方法，其特征在于，所述制备方法为：
    使所述丙三醇、所述新戊二醇、所述邻苯二甲酸酐和所述偏苯三酸酐混合发生缩聚反应，制得端羟基超支化聚酯，使所述端羟基超支化聚酯和所述二异氰酸酯反应，再加入所述中和剂、所述助溶剂、所述扩链剂和所述水，反应，加入所述水性固化剂，混合制得所述电子变压器用的水性绝缘漆。
  10. 一种权利要求1-8中任一项权利要求所述的电子变压器用的水性绝缘漆在浸渍电子变压器中的应用。
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