Preparation method for ester and alcohol soluble type polyurethane resin used for plastic composite ink
A polyurethane resin and polyurethane technology, applied in the field of polyurethane, can solve the problems of good adhesion and poor adhesion, and achieve the effects of low solvent residue, improved compatibility and wettability, and good wetting and dispersion.
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Embodiment 1
[0028] Under nitrogen atmosphere, heat 24 parts of dimer fatty acid to 90°C, add 3 parts of hexamethylenediamine dropwise, raise the temperature to 140°C for 3 hours, then add 2 parts of ethanolamine to react for 4 hours, cool down to 70°C, add 43 parts of pre-dehydrated Polybutylene adipate with a number average molecular weight of 2000, 0.8 parts of 1,4-butanediol, 0.9 parts of fatty alcohol polyoxyethylene ether and 19 parts of isophorone diisocyanate, in the catalyst dibutyltin dilauryl In the presence of presence, the temperature was raised to 80°C until the mass fraction of isocyanate groups in the reaction system was 3.3%, the temperature was lowered to 40°C, 6.7 parts of isophoronediamine and 0.6 parts of dibutylamine were added to react for 3 hours, and ethyl acetate and isopropyl The mixed solvent of alcohol adjusts the solid content to 30% to obtain the product with a viscosity of 1200mPa·s / 25°C and a number average molecular weight of 45000.
Embodiment 2
[0030] Under a nitrogen atmosphere, heat 22 parts of dimer fatty acid to 90°C, add 5 parts of ethanolamine, raise the temperature to 140°C for 4 hours, cool down to 70°C, add 39 parts of pre-dehydrated polyε-caprolactone with a number average molecular weight of 2000 Ester diol, 0.6 part of 1,4-butanediol, 1 part of fatty alcohol polyoxyethylene ether, 24 parts of isophorone diisocyanate, in the presence of catalyst dilauryl dibutyltin, the temperature is raised to 80 ° C to react to the mass of isocyanate group The fraction is 3.7%, lower the temperature to 40°C, add 7.7 parts of isophorone diamine and 0.7 parts of diethanolamine, react for 3 hours, add a mixed solvent of ethyl acetate and isopropanol to adjust the solid content to 30%, and the product is obtained. The viscosity is 500mPa·s / 25℃, and the number average molecular weight is 28000.
Embodiment 3
[0032] Under a nitrogen atmosphere, heat 22 parts of dimerized fatty acid to 90°C, add 0.8 parts of butanediamine dropwise, raise the temperature to 140°C for 3 hours, add 5 parts of 2-amino-2-methyl propanol, react for 4 hours, and cool down to 70 ℃, add 39 parts of dehydrated polybutylene adipate with a number average molecular weight of 1500, 0.7 parts of fatty alcohol polyoxyethylene ether, and 21 parts of isophorone diisocyanate, in the presence of the catalyst dibutyltin dilauryl Heat up to 80°C, react until the mass fraction of isocyanate groups is 3.8%, cool down to 40°C, add 10.5 parts of 1,3-bicyclo(aminoethyl)cyclohexane, 1 part of dibutylamine, react for 3 hours, add ethyl acetate and The mixed solvent of isopropanol is adjusted to a solid content of 30% to obtain a product with a viscosity of 800mPa·s / 25°C and a number average molecular weight of 36,000.
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