新品系云研774浓缩天然胶乳贮存性能研究  

Storage Properties of Yunyan 774 Concentrated Natural Latex

作　　者：万立红 仪明源 方林[1] 汪志芬[1] 廖建和[1] WAN Lihong;YI Mingyuan;FANG Lin;WANG Zhifen;LIAO Jianhe(College of Materials Science and Engineering,Hainan University,Haikou,Hainan 570228,China)

机构地区：[1]海南大学材料科学与工程学院,海南海口570228

出　　处：《热带作物学报》2024年第8期1696-1704,共9页Chinese Journal of Tropical Crops

基　　金：广东省重点领域研发计划项目(No.2020B020217001)。

摘　　要：云研774作为云南新开割的橡胶品种,对其胶乳成分与性能的研究,以及对其推广应用具有重要意义。本研究以新品系云研774浓缩天然胶乳为对象,以混合品系为对照,研究云研774浓缩天然胶乳在贮存过程中非胶组分、胶体性能和分子量及其分布的变化,以及贮存90 d后胶乳硫化胶膜交联密度、物理机械性能、老化性能和胶乳粒子大小及其分布等。结果表明:贮存90 d后,云研774的总固体含量和灰分含量基本不变,干胶含量下降1.1%,这与一些非胶物质反应生成加酸无法沉淀的物质有关;挥发物含量略有下降,而丙酮溶物含量、水溶物和氮含量则有不同程度的增加。云研774的高级脂肪酸含量随着贮存时间的延长而增加,生成有保护作用的铵皂,在前期起到提高机械稳定性的作用;热稳定度则逐渐下降,黏度先降低后基本恒定。挥发脂肪酸含量的增加在一定程度上不利于胶乳的保存;云研774胶乳硫化胶膜的物理机械性能和老化性能优于混合品系,与混合品系相比,云研774的分子量分布变宽,分子量稍低,粒径大小相差不大。Yunyan 774 is a newly bred rubber tree cultivar in Yunnan,the research on its latex composition and proper-ties is of great significance for its popularization and application.The changes of non-rubber components and colloidal properties,molecular weight and distribution of Yunyan 774 concentrated natural latex during storage,as well as the differences of crosslinking density,physical and mechanical properties,aging properties and latex particle size and dis-tribution after 90 days of storage were measured and analyzed.The experimental results showed that the total solid content and ash content of Yunyan 774 remained unchanged after 90 days of storage,and the dry rubber content de-creased by 1.1%,which was related to the reaction of some non-adhesive substances to form substances that could not be precipitated by adding acid.The content of volatile matter decreased slightly,but the content of acetone soluble con-tent,water soluble content and nitrogen increased in different degrees.The content of advanced fatty acids of Yunyan 774 increased with the extension of storage time,and the ammonium soap with protective effect was generated,which played a role in improving the mechanical stability in the early stage.The thermal stability decreased gradually,and the viscosity decreased first and then was basically constant.The increase of volatile fatty acid content was not conducive to the preservation of latex.The physical mechanical properties and aging properties of Yunyan 774 latex vulcanized rub-ber film were better than those of the mixed strain.Compared with the mixed strain,the molecular weight distribution of Yunyan 774 was wider,the molecular weight was slightly lower,and the particle size was not different.

关 键 词：浓缩天然胶乳 云研774 非胶组分 胶体性能 力学性能 

分 类 号：TQ331.2[化学工程—橡胶工业]