北京化工大学学报（自然科学版）
北京化工大學學報（自然科學版）
북경화공대학학보（자연과학판）
JOURNAL OF BEIJING UNIVERSITY OF CHEMICAL TECHNOLOGY(NATURAL SCIENCE EDITION)
2009年
6期
66-71
,共6页
夏宇正%陈一岭%石淑先%焦书科
夏宇正%陳一嶺%石淑先%焦書科
하우정%진일령%석숙선%초서과
聚氨酯乳液%丙烯酸酯乳液%肼基%酮羰基%改性
聚氨酯乳液%丙烯痠酯乳液%肼基%酮羰基%改性
취안지유액%병희산지유액%정기%동탄기%개성
polyurethane emulsion%acrylic copolymer latex%hydrazine group%ketone group%modification
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.
以聚酯二元醇、甲苯二異氰痠酯、二羥甲基丙痠(DMPA)、水閤肼等為原料,製得瞭自乳化的肼基封耑聚氨酯穩定乳液.以苯乙烯、丙烯痠乙酯、丙烯痠異辛酯、丙烯痠和雙丙酮丙烯酰胺為單體,通過乳液聚閤製得瞭含酮羰基丙烯痠酯共聚物乳液.將含肼基和酮羰基的兩種乳液共混,所得複閤乳液用作塑-塑複閤粘閤劑,使其在室溫下髮生酮肼交聯反應以提高粘接性能.攷察瞭預聚反應時間對預聚反應程度、不同DMPA含量和R值(預聚體中n(-NCO)/n(-OH))對聚氨酯乳液性能以及兩種乳液配比對膠膜凝膠含量、吸水率及180°剝離彊度的影響,併比較瞭含肼基聚氨酯和小分子己二酰肼對丙烯痠酯共聚物乳液的改性效果.結果錶明:噹預聚反應210min、DMPA質量分數4.5%、R值小于1.5時,可製得穩定的聚氨酯乳液;隨著共混乳液中肼基含量的增加,乳膠膜凝膠含量增大,吸水率增加,180°剝離彊度降低;含肼基的聚氨酯對丙烯痠酯共聚物乳液的改性效果優于小分子己二酰肼的改性.
이취지이원순、갑분이이청산지、이간갑기병산(DMPA)、수합정등위원료,제득료자유화적정기봉단취안지은정유액.이분을희、병희산을지、병희산이신지、병희산화쌍병동병희선알위단체,통과유액취합제득료함동탄기병희산지공취물유액.장함정기화동탄기적량충유액공혼,소득복합유액용작소-소복합점합제,사기재실온하발생동정교련반응이제고점접성능.고찰료예취반응시간대예취반응정도、불동DMPA함량화R치(예취체중n(-NCO)/n(-OH))대취안지유액성능이급량충유액배비대효막응효함량、흡수솔급180°박리강도적영향,병비교료함정기취안지화소분자기이선정대병희산지공취물유액적개성효과.결과표명:당예취반응210min、DMPA질량분수4.5%、R치소우1.5시,가제득은정적취안지유액;수착공혼유액중정기함량적증가,유효막응효함량증대,흡수솔증가,180°박리강도강저;함정기적취안지대병희산지공취물유액적개성효과우우소분자기이선정적개성.
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 occurs at room temperature and improves the adhesion properties on a plastic-plastic interface. The effects of varying reaction time on the content of the isocyanate group in the polyurethane prepolymer, and the amount of DMPA and the iso-cyanate index on the properties of the polyurethane emulsion were studied in detail. Gel content, water absorption rate and 180~* peel strength of the polyurethane/polyacrylic composite films were measured. The results showed that stable polyurethane emulsions could be prepared when the prepolymerization time was 210 min, the content of DMPA was 4.5%, and the isocyanate index was less than 1.5. The gel content and water absorption rate of the films increased and 180~* peel strength decreased when the hydrazine content in the composite emulsion was increased. The properties of the polyurethane/acrylate copolymer emulsion are superior to those of adipic dihydrazide.
