A model study on the impact of metal ions on pre-vulcanization of concentrated natural rubber latex and dipped-products

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, COMPOSITES Progress in Rubber Plastics and Recycling Technology Pub Date : 2021-12-27 DOI:10.1177/14777606211062909

P. Rojruthai, Narueporn Payungwong, J. Sakdapipanich

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Abstract

A model study on the influence of some heavy metal ions on the stability and vulcanization efficiency of uncompounded and compounded high-ammonia natural rubber (HANR) latex was carried out by an exogenous addition and then determined by Brookfield viscometer, mechanical stability time (MST) tester, and tensile testing machine. The case of pre-vulcanized HANR latex with different aging times was determined by the change in the volatile fatty acid (VFA) number, MST, and viscosity. The compounded HANR latex was coagulated by adding Mn2+and Mg2+ while it was unaltered by adding Zn2+, Fe2+, and Cu2+ ions, leading to their colloidal stability. Therefore, these metal ions were chosen further to study the pre-vulcanization of compounded HANR latex. The presence of Zn2+, Fe2+, and Cu2+ in the latex is responsible for the delay in the vulcanization process and changes the appearance of compounded latex. Before compounding, the addition of such metal ions led to the reduction in tensile strength of the obtained gloves. At the same time, there was no effect on the tensile properties of the gloves made from the compounded HANR latex containing the metal ions.

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金属离子对浓缩天然胶乳及浸渍制品预硫化影响的模型研究

采用外源添加法研究了部分重金属离子对未复配和复配高氨天然橡胶(HANR)胶乳稳定性和硫化效率的影响，并通过Brookfield粘度计、机械稳定时间(MST)测试仪和拉伸试验机进行了测定。通过挥发性脂肪酸(VFA)数、MST和粘度的变化来确定不同老化时间的预硫化HANR胶乳的情况。添加Mn2+和Mg2+能使复合HANR胶乳凝固，而添加Zn2+、Fe2+和Cu2+对复合HANR胶乳的胶体稳定性没有影响。因此，进一步选择这些金属离子对复合HANR胶乳的预硫化进行研究。胶乳中Zn2+、Fe2+和Cu2+的存在导致了硫化过程的延迟，改变了复合胶乳的外观。在复配前，这些金属离子的加入会导致得到的手套的抗拉强度降低。同时，含金属离子的复合HANR乳胶对手套的拉伸性能没有影响。

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来源期刊

Progress in Rubber Plastics and Recycling Technology MATERIALS SCIENCE, COMPOSITES-POLYMER SCIENCE

CiteScore

4.40

自引率

7.70%

发文量

审稿时长

>12 weeks

期刊介绍： The journal aims to bridge the gap between research and development and the practical and commercial applications of polymers in a wide range of uses. Current developments and likely future trends are reviewed across key areas of the polymer industry, together with existing and potential opportunities for the innovative use of plastic and rubber products.