Effect of Vacuum Degree on Properties of Natural Rubber Coagulated by Vacuum

Shuang HE; Shuang-quan L1AO; Yan-fang ZHAO; Shu-juan SHI; Xiao-xue LIAO; Bing-bing ZHANG; Ru ZHANG

doi:10.14028/j.cnki.1003-3726.2019.07.004

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Effect of Vacuum Degree on Properties of Natural Rubber Coagulated by Vacuum

更新时间：2022-09-02

- Effect of Vacuum Degree on Properties of Natural Rubber Coagulated by Vacuum
- Polymer Bulletin Vol. 32, Issue 7, Pages: 31-36(2019)
- 作者机构：
  
  1.海南大学材料科学与工程学院，海口 570228
  2.海南大学热带岛屿资源先进材料教育部重点实验室，海口 570228
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2019.07.004
  CLC：
- Published：20 July 2019，
  
  Received：18 October 2018，
  
  Revised：27 March 2019，
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Shuang HE, Shuang-quan L1AO, Yan-fang ZHAO, Shu-juan SHI, Xiao-xue LIAO, Bing-bing ZHANG, Ru ZHANG. Effect of Vacuum Degree on Properties of Natural Rubber Coagulated by Vacuum. [J]. Polymer Bulletin 32(7):31-36(2019)
DOI：

Shuang HE, Shuang-quan L1AO, Yan-fang ZHAO, Shu-juan SHI, Xiao-xue LIAO, Bing-bing ZHANG, Ru ZHANG. Effect of Vacuum Degree on Properties of Natural Rubber Coagulated by Vacuum. [J]. Polymer Bulletin 32(7):31-36(2019) DOI： 10.14028/j.cnki.1003-3726.2019.07.004.

摘要

采用真空凝固天然胶乳，探讨真空度对真空凝固天然橡胶（NR）理化性能、力学性能、热稳定性、交联密度及加工性能的影响，并与酸凝固的天然橡胶进行了对比。研究表明，真空凝固NR生胶的氮含量低于酸凝固的生胶，且随着真空度的增加而逐渐降低，塑性初值（

）以及塑性保持率（PRI）均高于酸凝固生胶，灰分含量和门尼粘度相差不大。真空凝固NR的力学性能优于酸凝固，且随着真空度的增加，硫化胶的拉伸强度稍有提高。两种方式凝固的胶料硫化特性和热稳定性相差不大；真空凝固NR的交联密度比酸凝固的大，其加工性能好于酸凝固胶样。在所研究的真空度范围内，采用—0.95MPa真空度进行辅助凝固所得天然橡胶的综合性能较好。

Abstract

Vacuum treatment was used to coagulate natural latex. The effects of vacuum on physical and chemical properties

mechanical properties

thermal stability

crosslink density and processing properties of vacuum coagulated natural rubber (NR) were investigated

and compared with acid-coagulated natural rubber. The results show that the nitrogen content of vacuum coagulated NR is lower than that of acid coagulated NR. The nitrogen content gradually decreases with the increase of vacuum degree. The initial plastic value (

) and plastic retention rate (PRI) of vacuum coagulated NR are higher than those of acid coagulated NR. The ash content and Mooney viscosity are not much different. The mechanical properties of vacuum solidified NR are better than acid solidificatied NR

and the tensile strength of vulcanizate increases slightly with the increase of vacuum. As the degree of vacuum increases

the tensile strength of vulcanizates rises slowly. The vulcanization characteristics and thermal stability of NR are not much difference. The crosslinking density of vacuum solidified NR is larger than that of acid solidification

and its processing performance is better than that of acid-solidified rubber. In the range of vacuum

the comprehensive performance of NR is good when vacuum is —0.95MPa.

关键词

天然橡胶真空度凝固性能

Keywords

Nature rubberVacuumCoagulationProperties

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