MMA/DMC/AM/AA共聚物乳液的合成及其环压增强作用

Preparation of Amphoteric MMA/DMC/AM/AA Quadripolymer Emulsion and Its Ring Crush-strengthening Function

关键词:  两性四元共聚物  环压强度  表面施胶  增强

Key Words:amphometric quadripolymer  ring crush strength  surface sizing  strengthening

摘要:以丙烯酰胺(AM)、甲基丙烯酰氧乙基三甲基氯化铵（DMC）、甲基丙烯酸甲酯（MMA）和丙烯酸（AA）为主要原料，通过无皂乳液聚合制备了稳定且性能优异的两性MMA/DMC/AM/AA四元共聚物乳液纸张环压增强剂，并优化了合成工艺条件。通过傅里叶红外光谱仪(FT-IR)、热失重分析仪(TGA)、激光颗粒粒度分析仪(DLS)和扫描电镜(SEM)对MMA/DMC/AM/AA四元共聚物乳液纸张环压增强剂结构、胶膜热稳定性、乳液粒径及应用该乳液进行表面施胶前后的纸张进行了分析，并考察了MMA、AM 含量和AA与DMC质量比对共聚物乳液环压增强性能的影响。结果表明，w(MMA)=1.5%，w(AM)=8.5%，m(AA)∶m(DMC)=1.5～2.0时，制备的共聚物乳液的环压增强性能优异；以共聚物乳液（质量分数为0.5%）和淀粉（质量分数5%）组成的表面施胶液对瓦楞原纸施胶时,施胶后纸张环压指数高达8.68 N·m/g，与施胶前相比提高93.8%。

Abstract:A amphoteric ring crush strengthening agent MMA/DMC/AM/AA for surface sizing application with good stability and excellent property was prepared through surfactant-free emulsion polymerization with acrylamide (AM), methacryloyl oxygen ethyl three methyl ammonium chloride (DMC), methyl methacrylate (MMA) and acrylic acid (AA) as raw materials, and the synthetic process was optimized. The structure, thermal stability and particle size of MMA/DMC/AM/AA were characterized by Fourier transform spectroscopy (FT-IR), Thermogravimetric analysis (TGA) and Dynamic light scattering (DLS), and the surface morphology of sized and unsized papers were studied by Scanning electron microscope (SEM). Furthermore, effects of AM and MMA contents as well as the mass ratio of AA to DMC on papers’ ring crush index were investigated. It was found that the paper sized with the MMA/DMC/AM/AA was endowed with excellent ring crush strength when w(MMA)=1.5%, m(AA)∶m(DMC)=1.5~2.0, w(AM)=8.5%. The ring crush index of the corrugating medium with 100 g/m2 basis weight was up to 8.68 N·m/g.