亲水基团对高固含量磺酸盐型水性聚氨酯性能的影响

Effects of hydrophilic chain-extending agent on characterization of high-solid content sulphonated waterborne polyurethane

摘要:

以异氟尔酮二异氰酸酯、六亚甲基二异氰酸酯、聚己二酸1,4-丁二醇酯为主要原料,以1,4-丁二醇为小分子扩链剂,以乙二胺基乙磺酸钠（AAS）为亲水性扩链剂，合成了高固含量的磺酸盐型水性聚氨酯乳液(SWPU)。实验采用FT-IR、TEM、XRD等方法研究了AAS加料方式及扩链时间对水性聚氨酯性能的影响。研究结果表明：当一次性加入AAS、且扩链时间为25min时，可得到固含量高达50%的磺酸盐型水性聚氨酯乳液，乳液外观呈乳白，乳胶粒都呈规则的球形结构，乳液的粘度、平均粒径适中，且具有较佳的综合性能； 在XRD谱图的2θ= 21.30?和2θ=22.34?处，出现了两个衍射峰，这表明所得产物的乳胶膜具有明显的结晶特性。

Abstract:

Sulphonated waterborne polyurethane (SWPU) emulsions were synthesized by the reaction of polyethylene glycol adipate diol (PBA) and isophorone diisocyanate(IPDI) , hexamethylene diisocyanate (HDI), and N-(2-aminoethyl)-amino ethane sulphonated sodium was used as hydrophilic chain extender. The influences of the feeding methods and chain extension time of AAS on performance of SWPU were investigated by using FT-IR, TEM, XRD and so on. The results showed that when the one-time feeding mode of AAS was applied and the chain extension time was 25min, SWPU with 50% solid content was obtained, and the particles of SWPU were spherical shapes, the average particle size, viscosity and hardness were appropriate, and two sharp diffraction peaks at 2θ=21.30?and 22.34?in XRD indicated the crystallization of the synthesized sulphonated waterborne polyurethane films.