尿素衍生物对硅橡胶海绵性能的影响

以硅橡胶海绵的孔隙率、口模膨胀率、密度和硬度为测评参数，研究了尿素衍生物及其与氧化锌并用作发泡助剂对以发泡剂H发泡的硅橡胶海绵性能的影响。结果显示：在用发泡剂H制备硅橡胶海绵中，尿素衍生物作发泡助剂可有效提高发泡效果，当其用量为0．3份时．硅橡胶海绵的孔隙率达到70%，口模膨胀率达到325％，其密度为0.33g／cm^3，硬度为22；当以尿素衍生物为第一发泡助剂，ZnO为第二发泡助剂时，发泡效果进一步改善，当ZnO用量为0.6份时，硅橡胶海绵的孔隙率达到75％，口模膨胀率达到400%，其密度为0.31g／cm^3，硬度为22，且质地均匀美观，泡孔结构更为理想。SIEM电镜分析表明，当发泡剂H与氧化锌配合尿素衍生物并用时，可得到较理想的硅橡胶海绵。

Influence of Urea Derivative on Silicone Rubber Sponge

The measurement of the porosity, expansion ratio, density, and hardness of molder rubber articles was exerted to study the influence of urea derivative and urea derivative/ZnO on the foaming of heat vulcanization silicone rubber with foamer H.The results showed that if urea derivative was added into the system as a foamer, then the foaming could be improved effectively, and when its concentration was 0.3phr, the porosity of silicone rubber foam was 70%,the expansion ratio 325%, the density 0.33g/cm~3,and the hardness 22; when ZnO/urea derivative were cooperated with foamer H, a relatively ideal result would be obtained and the foaming effect was also further improved, and at the dosage of 0.6phr of ZnO, the porosity of silicone rubber foam was 75%, the expansion ratio 400%,the density 0.31g/cm~3,and the hardness 22, and the structure of foam was more ideal. Finally, the analysis of SEM proved that when the system of foamer H/urea derivative/ZnO was applied, a relatively ideal silicone rubber foam could be achieved.