液体天然橡胶氧化降解制备工艺的比较  

Preparation of liquid natural rubber by chemical degradation with four kinds of oxidation agent

作　　者：从琴琴[1] 张哲[2] 杨晓红[2] 廖双泉[2] 谢贵水[3] 

机构地区：[1]海南大学农学院,海南儋州571737 [2]海南大学材料与化工学院,海南海口570228 [3]中国热带农业科学院橡胶研究所,海南儋州571737

出　　处：《弹性体》2012年第3期32-36,共5页China Elastomerics

基　　金：海南省自然科学基金(509005);海南大学校基金(hd09xm69);中国热带农业科学院橡胶研究所基本科研业务费专项资金项目(1630022011038)

摘　　要：采用了3种新的降解体系硝基苯过氧化氢、过硫酸钾丙醛和高碘酸制备液体天然橡胶(LNR),并与传统的降解剂苯肼进行了对比。通过正交实验考察了降解剂用量、温度、时间等对粘均相对分子质量(Mη)的影响,并通过红外光谱对降解后橡胶分子的结构进行了探讨,得到最佳降解体系。结果表明:高碘酸降解所得LNR结构单一稳定,当其用量为干胶质量的0.3%、30℃下反应6h可得到Mη为13 067的LNR,高碘酸是最佳的天然橡胶降解剂。Nitrobenzene-hydrogen peroxide, potassium persulfate-propionaldehyde and periodic acid as three new type s of chemical degradation were adopted to prepare liquid natural rubber （LNR） and compared with the conventional one, phenyl hydrazine. The effects of the amount of oxidant, reaction temperature, reac tion time on the viscosity-average relative molecular mass （Mη）of LNR were investigated. The structure of LNR was discussed with ItL The results showed that the LNR with Mη=13 067 could be obtained when the amount of periodic acid was 0. 3 percent, under the conditions of 30 ℃ for 6h. And the structure of product is stability. So periodic acid is the most suitable for the preparation of LNR.

关 键 词：液体天然橡胶 降解剂 粘均相对分子质量 

分 类 号：TQ332.5[化学工程—橡胶工业]