A kind of high heat-resistant polyurethane insulating varnish and preparation method thereof
A polyurethane and insulating varnish technology, which is applied in polyurea/polyurethane coatings, coatings, fireproof coatings, etc., can solve the problems that polyesterimide insulating varnishes do not have direct welding performance and are inconvenient to use, and achieve superior softening resistance, Wide range of applications and the effect of improving mechanical strength
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Embodiment 1
[0024] A kind of high heat-resistant polyurethane insulating varnish, described high heat-resistant polyurethane insulating varnish is made by the reaction of polyester polyol, blocked isocyanate, modified PU resin, catalyst and mixed solvent; Wherein, polyester polyol, blocked isocyanate , The mass ratio of the modified PU resin to the mixed solvent is 1:1:0:0.4, and the consumption of the catalyst is 0.1% of the total mass of the reactants.
[0025] The preparation method of the polyester polyol is as follows: mix imide carboxylic acid, diol, dibasic acid, tribasic alcohol and catalyst, mix evenly and then raise the temperature to 160°C for esterification reaction, when the water yield reaches 80% After that, slowly raise the temperature to 210°C, react for 4 hours to reach the end of the reaction, then cool down to 150°C, add a certain amount of mixed solvent, stir evenly, and prepare polyester polyol with a solid content of 40%; among them, imide carboxylic acid, The mass ...
Embodiment 2
[0035] A kind of high heat-resistant polyurethane insulating varnish, described high heat-resistant polyurethane insulating varnish is made by the reaction of polyester polyol, blocked isocyanate, modified PU resin, catalyst and mixed solvent; Wherein, polyester polyol, blocked isocyanate , The mass ratio of the modified PU resin to the mixed solvent is 1:1.2:0.1:0.7, and the consumption of the catalyst is 1% of the total mass of the reactants.
[0036] The preparation method of the polyester polyol is as follows: mix imide carboxylic acid, dibasic alcohol, dibasic acid, tribasic alcohol and catalyst, mix evenly and then raise the temperature to 162°C for esterification reaction, when the water yield reaches 80% Afterwards, slowly raise the temperature to 215°C, react for 4.5 hours to reach the end of the reaction, then cool down to 150°C, add a certain amount of mixed solvent, stir evenly, and prepare polyester polyol with a solid content of 42%; among them, imide carboxylic a...
Embodiment 3
[0046] A kind of high heat-resistant polyurethane insulating varnish, described high heat-resistant polyurethane insulating varnish is made by the reaction of polyester polyol, blocked isocyanate, modified PU resin, catalyst and mixed solvent; Wherein, polyester polyol, blocked isocyanate , The mass ratio of the modified PU resin to the mixed solvent is 1:1.4:0.25:0.8, and the consumption of the catalyst is 2.5% of the total mass of the reactants.
[0047] The preparation method of the polyester polyol is as follows: mix imide carboxylic acid, dibasic alcohol, dibasic acid, tribasic alcohol and catalyst, mix evenly and then raise the temperature to 165°C for esterification reaction, when the water yield reaches 80% After that, slowly raise the temperature to 225°C, react for 5 hours to reach the end of the reaction, then cool down to 150°C, add a certain amount of mixed solvent, stir evenly, and prepare polyester polyol with a solid content of 45%; among them, imide carboxylic ...
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Abstract
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