鲜胶乳稀释浓度对酶凝固天然橡胶组成及性能的影响
Effect of dilution concentration of fresh latex on composition and properties of natural rubber coagulated by enzymes
李建伟 1杨茹茹 2丁丽 1李云 3黄红海 1戴拓 1吴凡 1桂红星1
作者信息
- 1. 中国热带农业科学院橡胶研究所,海南 海口 571101;海南省天然橡胶栽培与加工工程研究中心,海南 海口 571101
- 2. 海南医学院 国际护理学院,海南 海口 571199
- 3. 勐腊田野橡胶销售有限责任公司,云南 西双版纳 666303
- 折叠
摘要
采用碱性蛋白酶凝固稀释浓度为34%,25%,20%,17%的鲜胶乳,制备天然橡胶样品,探究鲜胶乳稀释浓度对酶凝固天然橡胶组成及性能的影响.分别采用无转子流变仪、橡胶加工分析仪、拉力试验机等仪器来表征天然橡胶的性能.结果表明,随着鲜胶乳稀释浓度的降低,天然生胶的塑性初值(P0)先升高后降低,而塑性保持率(PRI)则相反;其氮含量、丙酮溶物含量及分子链支化度逐渐降低;混炼胶的焦烧时间(t10)、正硫化时间(t90)分别增加了19.05%,5.62%,而扭矩差则逐渐降低;硫化胶的拉伸强度、撕裂强度、定伸应力等略有降低,而扯断伸长率略有增加.
Abstract
Natural rubber samples were prepared using alkaline proteinase coagulation of fresh latex with dilution concentrations of 34%,25%,20%and 17%to investigate the effect of dilution concentration of fresh latex on composition and properties of natural rubber coagulated by enzymes.The natural rubber was characterised using instruments such as rotorless rheometer,rubber processing analysers and tensile testing machines,respectively.The results showed that as the dilution concentration of fresh latex decreased,the plasticity initial value(P0)of natural raw rubber firstly increased and then decreased,while the plasticity retention rate(PRI)was the opposite;its nitrogen content,acetone soluble content and molecular chain branching gradually decreased;the scorch time(t10)and positive vulcanisation time(t90)of the com-pound rubber increased by 19.05%and 5.62%respectively,while the torque difference gradually de-creased;the tensile strength,tear strength and constant elongation stress of the vulcanised rubber slightly decreased,while the elongation at tear slightly increased.
关键词
鲜胶乳/稀释浓度/酶凝固/天然橡胶Key words
fresh latex/dilution concentration/enzyme coagulation/natural rubber引用本文复制引用
基金项目
国家重点研发计划部省联动项目(2022YFD2301203)
国家天然橡胶产业技术体系建设专项(CARS-33-JG1)
出版年
2024
NETL
NSTL
万方数据