Preparation method of waterborne polyurethane emulsion
A technology of water-based polyurethane and emulsion, which is applied in the direction of textiles, papermaking, fiber treatment, etc., and can solve the problem that the hydrophobicity of water-based polyurethane does not meet the requirements of the ideal hydrophobicity of coated fabrics.
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[0013] The preparation method of the aqueous polyurethane emulsion of the present invention includes the following steps: (1) In a four-necked round-bottomed flask, sequentially add 9.86 g isophorone isocyanate, 15 g polyether 210, 1.88 g castor oil and double-terminal hydroxyl poly Siloxane, fully stirred and heated at 40℃, added catalyst, and reacted for 2h; (2) Add DMPA, continue to react for 2h, then add BDOTMP, continue to react for 100min, and then cool; (3) Add triethylamine to neutralize, and cool to Add 70g of deionized water to emulsify at 25°C and stir vigorously to obtain a waterborne polyurethane emulsion modified with castor oil and double-terminated polysiloxane.
[0014] In the preparation method of the aqueous polyurethane emulsion of the present invention, the four-neck round-bottom flask in step (1) is provided with a thermometer and a stirrer. The heating temperature in step (1) is 70°C. The catalyst in step (1) is dibutyl tin dilaurate.
[0015] In the prepar...
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