摘要
以丙烯酸酯类低聚物（DJW-330）为改性剂、聚醚和异氟尔酮二异氰酸酯为原料，采用自乳化法合成厂改性的水性聚氨酯（WPU）乳液。采用GPC、FTIR、DSC和荧光显微镜等方法对产物进行了结构表征及性能分析。实验结果表明，当采用分步法滴加引发剂偶氮二异丁腈（AIBN）和混合溶剂（丙酮和乙酸乙酯的体积比3：4）时，AIBN用量（基于丙烯酸酯单体总质量）为0．4％～0．6％时可得到黏度和相对分子质量适中的DJW-330；当DJW-330用量（基于固体总质量）为1．4％时改性WPU的综合性能最佳，初黏度可达14号球，持黏度达100min，且乳液稳定性好。表征结果显示，DJW-330是以化学键的形式结合到WPU分子链中的，用DJW～330改性的WPU颗粒的粒径明显变大且改性的WPU胶膜的耐热性能有所提高。
The modified waterborne polyurethane （WPU） emulsion was prepared from polyether and isophorone diisocyanate with acrylate oligomer （DJW-330） as modifier through self-emulsion method. The product was characterized by means of GPC, FTIR, DSC and Fluorescence microscope. The results showed that DJW-330 with required viscosity and relative molecular mass could be obtained by stepwisely adding 0.4% -0.6% azodiisobutyronitrile （based on the total acrylate monomer mass） and mixed acetone/ethyl acetate solvent with volume ratio of 3 ： 4. When the dosage of DJW-330 was 1.4% （based on the total solid mass）, integrative properties of the modified WPU was good, for example, the initial tack could reach 14#（ ball number）, the persistent adhesivity could maintain longer than 100 minutes and stability of the emulsion was high. The characterization results showed that DJW- 330 was combined with the polyurethane by chemical bonding, the modified WPU had obvious bigger particle size and its thermal stability was greatly increased compared to unmodified WPU.
出处
《石油化工》
CAS
CSCD
北大核心
2011年第8期895-900,共6页
Petrochemical Technology
基金
常州大学校基金赞助项目(09ZMF005)
关键词
水性聚氨酯乳液
自乳化法
丙烯酸酯类低聚物
压敏胶
初黏度
持黏度
waterborne polyurethane emulsion
self-emulsion method
acrylate oligomer
pressure sensitive adhesive
initial tack
persistent adhesivity
