多酚改性两性聚氨酯的制备及性能

Preparation and properties of amphoteric polyurethane modified by polyphenol

以异氟尔酮二异氰酸酯(IPDI)和聚丙二醇(PPG)为原料,采用多酚PP为阴离子扩链剂,N-甲基二乙醇胺(MDEA)为阳离子扩链剂,制备出一种新型两性聚氨酯乳液(AWPU).用紫外光谱(UV)和红外光谱(FT-IR)对AWPU主组分的分子结构进行了表征,证实了PP嵌入到聚氨酯主链上,并研究了不同配方下PP用量对乳液粒径的影响,测定了不同pH值下AWPU的电位与电导率.最后将AWPU乳液与甲醛标准溶液反应前后的甲醛浓度进行了测试.结果表明:随着PP用量的增加,AWPU的粒径呈现先减小后增大的趋势;pH等于6.6时,AWPU不显电性,电位为零且其等电区位于5.0~7.8,本实验制备的AWPU乳液有降低溶液中甲醛浓度的功能,在降低甲醛含量方面具有较好的应用前景.

A new type of amphoteric polyurethane emulsion（AWPU）was prepared with isoflolone diisocyanate（IPDI）and polypropanediol（PPG）as raw materials,polyphenols PP as anionic chain extender and N-methyl two ethanolamine（MDEA）as cationic chain extender.The structure of AWPU was characterized by UV spectroscopy（UV）and infrared spectroscopy（FT-IR）.It was confirmed that PP was embedded in the main chain of polyurethane.The effect of PP dosage on the particle size of the emulsion under different formulations was studied.The potential and electrical conductivity of AWPU under different pH were measured.Finally,the formaldehyde concentration before and after the reaction of AWPU emulsion and formaldehyde standard solution was tested.The results show that as the amount of PP increases,the particle size of AWPU decreases first and then increases.When pH is equal to 6.6,AWPU is not explicit,the potential is zero and its isoelectric area is located in 5.0~7.8.The AWPU emulsion prepared in this experiment has the function of reducing the concentration of formaldehyde in the solution,and it has a good application prospect in reducing formaldehyde content.