Graphene oxide modified polyurethane electrophoresis resin, polyurethane electrophoresis paint and preparation method thereof
A graphene modification, electrophoretic resin technology, applied in polyurea/polyurethane coatings, electrophoretic coatings, conductive coatings, etc., can solve the problem of limiting the promotion and application of surface decoration and protection, affecting the uniformity of graphene oxide dispersion, heat resistance It can improve the performance, solve the problems of easy settling and improve the stability.
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[0034] The present invention also provides a kind of preparation method of graphene oxide modified polyurethane electrophoretic resin as described in the above-mentioned embodiment, comprises the following steps:
[0035] S1: Mix graphene oxide with toluene diisocyanate, ultrasonically react at 70-80°C, then centrifuge to obtain toluene diisocyanate-modified graphene oxide, dissolve it in isophorone diisocyanate and mix Uniform;
[0036]In this step, toluene diisocyanate is used to react with the hydroxyl functional group of graphene oxide to prepare isocyanate-modified activated graphene oxide. Since there are reactive isocyanate active functional groups on the surface of graphene oxide, graphene oxide can be chemically connected to the molecular backbone of polyurethane through a chemical reaction by in-situ polymerization to form a graphene oxide-grafted macromolecular backbone. The new polyurethane / graphene oxide composite electrodeposition resin better solves the technic...
Embodiment 1
[0052] Take 25.8g of polyether polyol with a relative molecular mass of 1000, and dehydrate it at 120°C for 1h; then add 74g of the mixture of isophorone diisocyanate and graphene oxide rice tubes, and react at 80°C for 2h; In the presence of the solvent 1,4-dioxane, add 22.5g of N-methyldiethanolamine and react at 40°C for 3h; then in the presence of the solvent 1,4-dioxane, add 8.13g of epoxy Resin and 16.41g 1,4-butanediol, chain extension reaction at 80°C for 2h; finally cool down to 30°C, add 11.31g of glacial acetic acid, 10g of n-butanol and 20g of ethylene glycol butyl ether for neutralization reaction for 1h to obtain Graphene oxide modified polyurethane resin.
[0053] Take 40g of the above-mentioned graphene oxide modified polyurethane resin, add 10.72g of blocked isocyanate trimer and 1.2g of propylene glycol phenyl ether to it, emulsify and shear in water, then electroplate to form a film, and bake in an oven at 80°C for 30min , and then the temperature was raise...
Embodiment 2
[0055] Take 20.1g of polyether polyol with a relative molecular mass of 1000, and dehydrate it at 120°C for 1h; add 74g of isophorone diisocyanate and modified graphene oxide mixture, and react at 80°C for 2h; In the presence of the solvent 1,4-dioxane, add 22.5g of N-methyldiethanolamine and react at 40°C for 3h; then in the presence of the solvent 1,4-dioxane, add 8.13g of cyclo Oxygen resin and 16.41g 1,4-butanediol, chain extension reaction at 80°C for 2h; finally cool down to 30°C, add 11.31g of glacial acetic acid, 10g of n-butanol and 20g of ethylene glycol butyl ether for neutralization reaction for 1h. Obtain graphene oxide modified polyurethane resin.
[0056] Take 40g of the above-mentioned graphene oxide modified polyurethane resin, add 10.72g of blocked isocyanate trimer and 1.2g of propylene glycol phenyl ether to it, emulsify and shear in water, then electroplate to form a film, and bake in an oven at 80°C for 30min , and then the temperature was raised to 140°...
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