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Preparation method of heat resistant acetal wire enamel

A technology of acetal varnish and wire-covered varnish, which is applied in the direction of coating, etc., can solve the problems that the solvent formula does not fully consider the workability, poor adhesion between the paint film and the conductor, and cannot meet the requirements of use, so as to achieve good process adaptability and product quality. The effect of good consistency and good compatibility

Inactive Publication Date: 2010-11-24
溧阳市佳禾电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Low heat resistance, generally ≤120°C (Grade E);
[0006] 2. The viscosity of the paint liquid is too high (generally ≥3800mpa.s / 30℃), the process stability is poor, and the batch fluctuation is large;
[0007] 3. The adhesion between paint film and conductor is poor, which cannot meet the requirements of use, especially the change of seasonal temperature difference;
[0008] 4. The solvent formula does not fully consider the workability, the odor is irritating, and the environmental pollution is serious

Method used

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  • Preparation method of heat resistant acetal wire enamel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] According to the molar ratio, add 240 parts of cresol, 360 parts of xylene and 100 parts of butanol into the reaction kettle with agitator and reflux pipe, turn on the agitator and heat it, when the temperature reaches 50±5℃, at 0.5 Within 1 hour, add 125 parts of polyvinyl acetal resin in batches by feeding gradually, keep stirring at 80±5°C for 3 hours, cool to 50±5°C, and make semi-finished product A; Add 40 parts of cresol and 86 parts of xylene into the reaction kettle with agitator and reflux tube, turn on the agitator and heat, put 62 parts of novolac epoxy resin, keep it at 60±5℃ for 2 hours, and cool to 50±5°C to prepare semi-finished product B; put semi-finished product B into semi-finished product A and stir evenly, then add 28 parts of silicone resin and 4 parts of melamine resin, keep warm at 50±5°C / 2h, until the liquid is clear and homogeneous, Cool down to less than 45°C, add 0.1 part of leveling agent, stir for 1 hour, and filter to obtain the finished p...

Embodiment 2

[0047] According to the molar ratio, add 260 parts of cresol, 330 parts of xylene and 120 parts of butanol into the reaction kettle with agitator and reflux tube, turn on the agitator and heat it, when the temperature reaches 50±5℃, at 0.5 Within 1 hour, add 100 parts of polyvinyl acetal resin in batches by feeding step by step, keep stirring at 80±5°C for 3 hours, cool to 50±5°C, and make semi-finished product A; Add 50 parts of cresol and 90 parts of xylene into a reaction kettle with a stirrer and a reflux pipe, turn on the stirrer and heat, put in 65 parts of novolac epoxy resin, keep it at 60±5°C for 2 hours, and cool to Prepare semi-finished product B at 50±5°C; put semi-finished product B into semi-finished product A and stir evenly, then add 34 parts of silicone resin and 7 parts of melamine resin, keep warm at 50±5°C / 2h, until the liquid is clear and homogeneous, Cool down to less than 45°C, add 0.15 parts of leveling agent, stir for 1 hour, and filter to obtain the f...

Embodiment 3

[0049]According to the molar ratio, add 250 parts of cresol, 320 parts of xylene and 140 parts of butanol into the reaction kettle with agitator and reflux pipe, turn on the agitator and heat it, when the temperature reaches 50±5℃, at 0.5 Within 1 hour, add 105 parts of polyvinyl acetal resin in batches by feeding step by step, keep stirring at 80±5°C for 3 hours, cool to 50±5°C, and make semi-finished product A; Add 45 parts of cresol and 85 parts of xylene into the reaction kettle with agitator and reflux pipe, turn on the agitator and heat it, add 60 parts of novolac epoxy resin, keep it at 60±5℃ for 2 hours, and cool to 50±5°C to prepare semi-finished product B; put semi-finished product B into semi-finished product A and stir evenly, then add 32 parts of silicone resin and 6 parts of melamine resin, keep warm at 50±5°C / 2h, until the liquid is clear and homogeneous, Cool down to less than 45°C, add 0.12 parts of leveling agent, stir for 1 hour, and filter to obtain the fin...

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Abstract

The invention relates to acetal wire enamel meeting the heat level of 155 DEG C and above, which has good coating film and conductor adhesion. The heat resistant acetal wire enamel comprises the following components: 280-310 parts of methylphenol, 390-450 parts of dimethylbenzene, 100-160 parts of butanol, 100-125 parts of polyvinyl acetal resins, 57-65 parts of novolac epoxy resins, 28-34 parts of organic silicon resins, 4-7 parts of melamine resins and 0.08-0.15 of leveling agents by mole. The method has the following advantages: 1. in the subsequent wire enamel baking process, the process is easy to control, the molecular weight is uniform and the consistency is good; 2. the peculiar smell generated under normal temperature and during baking is reduced; 3. the product is stable in storage; 4. the coating processability is good and the prepared product has bright, clean and uniform surface; and 5. the heat resistance class of the prepared product is not less than 155 DEG C (F class), the hot stamping temperature thereof is not less than 180 DEG C and the cut-through temperature thereof is not less than 240 DEG C; and the prepared product has excellent medium resistance and excellent adhesion.

Description

technical field [0001] The invention relates to a preparation method of heat-resistant acetal wire enamel, in particular to a preparation method of heat-resistant acetal insulating varnish. Background technique [0002] Acetal wire enamel is a traditional insulating material that can be used to produce coils and wires for electrical equipment in oil-immersed environments. Due to the particularity of the winding machining process, the wire is required to have excellent paint film adhesion, outstanding transformer oil resistance, and can be used for a long time under the condition of working temperature ≤ 120 ° C. It has been widely used in oil-immersed transformer windings. Coating of coil wire. [0003] At present, according to the international IEC60317-18 / 19 standard, the heat level of traditional acetal paint is positioned at 105°C or 120°C. It has been difficult to meet the higher and higher heat level requirements. [0004] According to the characteristics of the ace...

Claims

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Application Information

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IPC IPC(8): C09D129/14C09D163/04C09D183/04C09D161/28C09D5/25
Inventor 王成宜史昌明陈永凤
Owner 溧阳市佳禾电子材料有限公司
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