Aqueous polyurethane emulsion for synthetic leather and preparation thereof
A water-based polyurethane and synthetic leather technology, applied in textiles, papermaking, fiber treatment, etc., can solve the problems of air permeability and waterproof, etc., and achieve the effect of plump hand feeling, reliable process and sufficient source
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[0019] Example 1
[0020]Add 100 parts of toluene diisocyanate (TDI), 120 parts of polyoxypropylene glycol, 20 parts of 2,2-dimethylolpropionic acid (DMPA), and 2 parts of tert-butyldimethylchlorosilane under stirring at room temperature. In a reaction vessel filled with nitrogen, the temperature was controlled at 80°C and reacted for 5 hours to obtain a prepolymer; at 5°C, the above prepolymer was slowly added dropwise to 500 parts of deionized water dissolved in 10 parts of triethylamine at high speed. Stir and emulsify, then continue to add 100 parts of nano-silica and 20 parts of (3,3'-diethyl-4,4'-diaminodiphenylmethane) terminal amino chain extender under high-speed stirring to react at 20℃5 Within hours, an aqueous polyurethane emulsion with a solid content of 60 wt% was obtained.
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[0021] Example 2
[0022] Put 70 parts of dicyclohexylmethane diisocyanate, 160 parts of polyoxypropylene triol, and 15 parts of 3-hydroxy-2-(hydroxymethyl)-2-methylpropionic acid in a reactor isolated from air. Control the reaction temperature at 80°C and react for 6 hours to obtain the prepolymer; at 0°C, slowly add the above prepolymer dropwise to 600 parts of deionized water dissolved in 10 parts of triethylamine, stir and emulsify at high speed, and then Continue to add 20 parts of nano silica under stirring, and react at 30° C. for 5 hours to obtain an aqueous polyurethane emulsion with a solid content of 55 wt%.
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