淀粉接枝苯丙无皂共聚物乳液的制备与表征

Preparation and Characterization of Starch Graft Soap-free Styrene-acrylate Copolymer Emulsion

中文关键词:  淀粉  无皂乳液聚合  松香  表面施胶剂

Key Words:starch  soap-free emulsion polymerization  rosin  surface sizing agent

中文摘要:

      以芬顿试剂为引发剂，木薯淀粉为主链，苯乙烯（St）、丙烯酸丁酯（BA）、松香、甲基丙烯酸二甲基氨基乙酯（DM）和N-羟甲基丙烯酰胺（NMA）为单体，采用无皂乳液聚合法在木薯淀粉分子上接枝苯丙共聚单体，合成出一种苯丙无皂乳液表面施胶剂，并通过傅里叶变换红外光谱仪、热重分析仪、粒径分析仪、静态接触角和扫描电镜对乳液的结构和性能进行了表征。结果表明，在淀粉用量10%、m(单体总量)∶m(淀粉)=2∶1、H₂O₂用量5.0%、m(St)∶m(BA)=3∶1、松香用量0.8%、DM用量1.2%、NMA用量0.2%条件下，合成了苯丙无皂乳液表面施胶剂；当其用量为淀粉施胶液的0.4%时，施胶度为46 s，纸张环压指数为5.47 N·m/g。

Abstract:

      Using Fenton reagent as initiator, cassava starch as main chain, the styrene (St), butyl acrylate(BA), rosin, dimethyl amino ethyl methacrylate(DM) and N-hydroxymethyl acrylamide (NMA) as main monomers，the soap-free emulsion sizing agent based on cassava starch grafted by styrene-acrylate comonomer was prepared by free-soap emulsion polymerization, and the structure and properties of the copolymer were characterized by FT-IR, TGA, particle size analyzer, static contact angle and SEM. The results showed that the excellent performance of styrene-acrylate copolymer emulsion was achieved when the dosage of starch was 10%, the mass ratio of total monomers and starch was 2∶1, the mass ratio of St and BA was 3∶1, the dosage of H₂O₂, rosin, DM and NMA were 5.0%, 0.8%, 1.2% and 0.2%, respectively. When the dosage of soap-free emulsion was 0.4% on the surface sizing agent, sizing degree was 46 s and ring crush index was 5.47 N·m/g.