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
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[0044] Example 1:
[0045] According to the molar ratio, add 240 parts of cresol, 360 parts of xylene, and 100 parts of butanol into a reactor with a stirrer and a reflux tube. Turn on the stirrer and heat. When the temperature reaches 50±5℃, the temperature is 0.5 Within 1 hour, add 125 parts of polyvinyl acetal resin in batches by means of gradual feeding, and keep stirring at 80±5℃ for 3h, and then cool to 50±5℃ to make semi-finished product A; In a reactor with a stirrer and a reflux tube, add 40 parts of cresol and 86 parts of xylene, turn on the stirrer and heat, put in 62 parts of phenolic epoxy resin, keep it at 60±5℃ for 2h, and cool to 50±5℃, make 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 at 50±5℃ / 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 a...
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[0046] Example 2:
[0047] According to the molar ratio, add 260 parts of cresol, 330 parts of xylene, and 120 parts of butanol into a reactor with a stirrer and a reflux tube. Turn on the stirrer and heat. When the temperature reaches 50±5℃, the temperature is 0.5 Within 1 hour, add 100 parts of polyvinyl acetal resin in batches by means of gradual feeding, and keep stirring at 80±5℃ for 3h, and cool to 50±5℃ to make semi-finished product A; In a reactor with a stirrer and a reflux tube, add 50 parts of cresol and 90 parts of xylene, turn on the stirrer and heat, put in 65 parts of phenolic epoxy resin, keep the temperature at 60±5℃ for 2h, and cool to 50±5℃, make semi-finished product B; 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 at 50±5℃ / 2h, until the liquid is clear and homogeneous. Cool down to less than 45°C, add 0.15 parts of leveling agent, stir for 1h, and filter to ob...
Example Embodiment
[0048] Example 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 tube, turn on the agitator and heat, and when the temperature reaches 50±5℃, the temperature is 0.5 Within 1 hour, add 105 parts of polyvinyl acetal resin in batches by means of gradual feeding, and keep stirring at 80±5℃ for 3h, then cool to 50±5℃ to make semi-finished product A; In a reactor with a stirrer and a reflux tube, add 45 parts of cresol and 85 parts of xylene, turn on the stirrer and heat, put in 60 parts of phenolic epoxy resin, keep the temperature at 60±5℃ for 2h, and cool to 50±5℃, make 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 at 50±5℃ / 2h, until the liquid is clear and homogeneous. Cool to less than 45°C, add 0.12 part of leveling agent, stir for 1h, and filte...
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