二苯甲烷二异氰酸酯基水性聚氨酯分散液的制备方法

Method for preparing dispersion liquid of aqueous polyurethane of diphenyl methane diisocyanate

Abstract

一种二苯甲烷二异氰酸酯基水性聚氨酯分散液的制备方法是将聚酯二醇、聚醚二醇或聚碳酸酯二醇和二羟甲基丙酸加入到反应器中,在室温搅拌下加入二苯甲烷二异氰酸酯和惰性异氰酸酯,加入丙酮后加热至丙酮回流温度反应,再加入1,4-丁二醇,在丙酮的回流温度下继续反应,降至室温,加入三乙氨中和二羟甲基丙酸,室温下搅拌5~30min后,滴加去离子水和哌嗪,强烈搅拌10~30min后,加热至丙酮回流温度反应,升温减压脱除丙酮得产品;本发明具有粘结强度高、硬度大的优点。
This invention relates to a method for preparing diphenylmethane diisocyanate-based aqueous polyurethane dispersion. The method comprises: (1) adding polyester diol, polyether diol or polycarbonate diol, and dihydroxymethyl propionic acid into a reactor; (2) adding diphenylmethane diisocyanate and inert isocyanate at room temperature under stirring; (3) adding acetone, heating to the refluxing temperature of acetone, and reacting; (4) adding 1,4-butylene glycol, and reacting at the refluxing temperature; (5) cooling to room temperature, adding triethylamine and dihydroxymethyl propionic acid, and stirring at room temperature for 5-30 min; (6) dropping deionized water and piperazine, vigorously stirring for 10-30 min, heating to the refluxing temperature of acetone, reacting, heating, and vacuum-distilling to remove acetone and obtain the product. The product has such advantages as high adhesiveness and high hardness.

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