自交联苯丙乳液的无皂聚合及其结构与表面施胶性能

Self-crosslinking Styrene-acrylate Latex: Soap-free Synthesis,Structure Characteristic and Sizing Performance

以N-羟甲基丙烯酰胺作自交联单体,聚乙烯醇(PVA)为高分子分散稳定剂,采用无皂种子聚合制备了稳定的自交联苯丙乳液。当软硬单体比例n(BA)/n(St)=1.0,w(PVA)=6%,w(ODA)=10%,w(NMA)=6%时,自交联苯丙乳液具有优异的施胶效果,当用质量分数为1%的苯丙乳液进行表面施胶时,纸张施胶度可达43.0 s,表面强度达3.2 m/s,耐折度88次,环压指数达7.38N.m/g;苯丙乳液与淀粉有良好的适配性,并可取得优异的复合施胶效果。通过动态激光粒径分析(DLLS)、差示扫描量热(DSC)等对乳液粒径及其分布和共聚物热转变性能及微相结构进行了表征。

Using N-hydroxymethyl Acrylamide（NMA） as self-crosslinking monomer,and polyvinyl alcohol（PVA） as polymeric colloid stabilizer,a kind of self-crosslinking surfactant-free copolystyrene-acrylat latex with good stability and excellent sizing performance was successfully synthesized by the free-radical copolymerization.At the same time,the synthesis process was optimized.The emulsion is endowed with excellent sizing performance when n（BA）/n（St）=1.0,w（PVA）=6%,w（ODA）=10%,and w（NMA）=6%,and with 1.0% polymer emulsion addition,the sizing value can reach 43.0 s,and surface strength of the paper approaches 3.2 m/s,folding endurance 88 times,ring crush index 7.38 N·m/g.The polymer emulsion is compatible with starch very well,the mixture has excellent sizing performance,and the emulsion particle size distribution and its copolymers thermal performance and microphase structures were characterized by the method of DLLS,DSC and so on.