摘要
应用N2H4·H2O(水合肼)/H2O2/CuSO4催化体系在常压下使天然胶乳氢化制备氢化天然橡胶,结果表明硬脂酸钠、五水硫酸铜、水合肼用量及反应温度对HNR饱和度有显著的影响,当没有外加硬脂酸钠,铜离子与天然橡胶干胶分子链上双键的摩尔数之比为1:10000,水合肼与干胶分子链上双键的摩尔数之比为1.4:1,反应温度45℃时,HNR饱和度可达到64.6%。天然橡胶氢化后,其硫化胶力学性能得到改善,耐老化性能显著提高。
Hyd rogenaton of natural rubber （HNR） was made by using N2H4· H2O/H2O2/CuSO4 system under normal pressure to hydrogenate NR latex. The reaction temperature as well as concentrations of sodium stearate, copper sulfate pentahydrate and hydrazine hydrate were found to have a pronounced effect on saturation of HNR. Hydrogenation of HNR of upto 64.6 % was achieved in the absence of sodium stearate but with molar ratios of copper ion versus double bond of NR molecular chain at 1：10 000, molar ratios of hydrazine hydrate versus double bond of NR molecular chain at 1.4：1 and at the reaction temperature of 45℃. Compared with NR, the mechanical properties of HNR vulcanizate were improved and the aging resistance increased distinctly.
出处
《热带作物学报》
CSCD
2006年第2期95-98,共4页
Chinese Journal of Tropical Crops
关键词
天然胶乳
氢化
性能
natural rubber latex hydrogenation properties
