改性聚硫橡胶的研究及制备

Development of Modified Polysulfide Sealant

用过量的甲苯二异氰酸酯(TDI)与不同分子量的聚醚(PPG)反应,首先形成有活性端基(-NCO)的聚氨酯预聚体。加入液态聚硫橡胶(LP3),经过催化剂的催化反应生成改性聚硫橡胶,用丁苄酯,通过分子设计,合成出了具有良好性能又能应用于中空玻璃的新型改性聚硫橡胶。用红外光谱鉴定了其物质结构,并作固化试验测定其固化后的硬度,及其黏度等一系列性能,最终确定甲苯二异氰酸酯与聚醚的比率为2∶1(摩尔比);预聚体、液态聚硫橡胶和溶剂的比为1∶1∶1(质量比)。通过于原来的中空玻璃密封胶比较,其具有很好的性能且成本很低。

Excess tolylene diisocyanate can be reacted suitably with the polyether to be superior insulated glass sealants , and the invention comprises making a sealant base first by mixing the isocyanate -terminated prepolymer , which reacted with suitable liquid polysulfide.The dibutyl phthalate was solvenvt.Product in the produce for making the insulated glass sealant had a good hehaviour , and the product physical propercy can be assuranced with IR spectrum.After the curing experiment , it determinated that tolylene diisocyante：polyether ratios was 2：1 （ mole ratio ） and propolymeres：liqud polysulfide：dibutyl phthalate ratios was 1：1：1 （ mass ratio ）.Through the comparison of the insulating glass , it had good characteristics and performance.