改性木质素磺酸盐/丙烯酸酯共聚乳液的制备

Study on Preparation of Modified Lignosulfonate/Acrylate Copolymerization Emulsion

木质素磺酸盐(LS)是亚硫酸盐制浆工艺的副产物,利用马来酸酐和丙烯酰氯分别与其反应进行改性,在分子中引入双键,然后在乳液中与丙烯酸酯单体接枝共聚,得到木质素基接枝共聚物,研究后发现,原LS与单体比为1∶5时,LS转化率仅为25.1%,接枝效率为26.3%,接枝率为129.5%;而采用马来酸酐和丙烯酰氯改性后的LS时,其木质素转化率分别为81.2%和83%,接枝效率达71.8%和72.6%,接枝率达378.3%和341.4%。改性产物的结构和共聚乳液的粒子形态分别用IR和TEM进行研究。

Lignosulfonate （LS） is the byproduct of sulfite pulping process. In this paper vinyl group was introduced into the molecule of LS by reacting it respectively with maleic anhydride and acryloyl chloride. Then grafted copolymer of modified lignosulfonate/acrylate was prepared through emulsion polymerization . It was found that as the dosage ratio of lignin to monomers was 1 ： 5 ,conversion rate of non-modified LS was only 25, 1%, grafting efficiency was 26.3 %, grafting rate was 129, 5 %, For LS modified by maleic anhydride and acryloyl chloride respectively, conversion rates were 81.2 % and 83 %, grafting efficiencies reached 71.8 % and 72.6 %,grafting rates reached 378, 3 % and 341.4 % respectively. Furthermore,the structure of modified LS and the morphology of copolymerization emulsion particles were studied by IR and TEM respectively.