肼基封端聚氨酯乳液的制备及其对丙烯酸酯共聚物乳液粘合剂的改性

以聚酯二元醇、甲苯二异氰酸酯、二羟甲基丙酸(DMPA)、水合肼等为原料，制得了自乳化的肼基封端聚氨酯稳定乳液。以苯乙烯、丙烯酸乙酯、丙烯酸异辛酯、丙烯酸和双丙酮丙烯酰胺为单体，通过乳液聚合制得了含酮羰基丙烯酸酯共聚物乳液。将含肼基和酮羰基的两种乳液共混，所得复合乳液用作塑 塑复合粘合剂，使其在室温下发生酮肼交联反应以提高粘接性能。考察了预聚反应时间对预聚反应程度、不同DMPA含量和R-值(预聚体中n(—NCO)/n(—OH))对聚氨酯乳液性能以及两种乳液配比对胶膜凝胶含量、吸水率及180°剥离强度的影响，并比较了含肼基聚氨酯和小分子己二酰肼对丙烯酸酯共聚物乳液的改性效果。结果表明：当预聚反应210min、DMPA质量分数4.5%、R值小于1.5时，可制得稳定的聚氨酯乳液；随着共混乳液中肼基含量的增加，乳胶膜凝胶含量增大，吸水率增加，180°剥离强度降低；含肼基的聚氨酯对丙烯酸酯共聚物乳液的改性效果优于小分子己二酰肼的改性。

Preparation and study of hydrazine-terminated polyurethane emulsions for modifying polyacrylic-copolymer latex adhesives

Stable hydrazine-terminated polyurethane emulsions have been prepared using toluene diisocyanate,polyester diol,dimethylol propanic acid(DMPA) and hydrazine hydrate as raw materials.A polyacrylic latex incorporating ketone groups was synthesized by emulsion polymerization using styrene,ethyl acrylate and iso-octyl acrylate as the main monomers,and acrylic acid and diacetone acrylamide as functional monomers.The reaction between the hydrazine and ketone groups in a composite polyurethane/polyacrylic emulsion...