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在(NH4)2SO4和NaCl组成的复盐水溶液中,以甲基丙烯酰氧乙基三甲基氯化铵(DMC)为阳离子单体,聚甲基丙烯酰氧乙基三甲基氯化铵(PDMC)为分散稳定剂,偶氮二异丁基脒二盐酸盐(V50)为引发剂,通过分散聚合法成功合成了固含量高、黏度低、稳定性好、溶解速度快的阳离子聚丙烯酰胺(CPAM)水基分散体。考察了总单体浓度、分散剂用量、盐用量和配比、反应温度等对CPAM性能的影响,并用激光衍射粒度仪和颗粒电荷测定仪(PCD)等对分散体进行表征。通过优化得出,在单体浓度14%,盐用量24%,m((NH4)2SO4):m(NaCl)=23.5:0.5,PDMC4%时,聚合得到的CPAM水基分散体各项性能较佳。将制得的CPAM用作文化用纸生产的助留助滤剂,对CPAM用量、CPAM与浆料的接触时间、搅拌速度等工艺参数进行了优化。当应用条件达到最佳时,浆料的填料留着率从空白时的23.35%提高到73.74%,打浆度也从39°SR降低至25°SR。
In the double salt solution of (NH4) 2SO4 and NaCl, methacryloyloxyethyltrimethylammonium chloride (DMC) as the cationic monomer, polymethacryloyloxyethyltrimethylammonium chloride (PDMC) as dispersion stabilizer and azobisisobutylamidine dihydrochloride (V50) as initiator, the cationic poly (vinyl alcohol) with high solid content, low viscosity, good stability and high dissolution rate was successfully synthesized by dispersion polymerization Acrylamide (CPAM) water-based dispersion. The effects of total monomer concentration, dispersant dosage, salt dosage and ratio, reaction temperature on the performance of CPAM were investigated. The dispersion was characterized by laser diffraction particle sizer and particle charge analyzer (PCD). The results showed that the performance of the CPAM aqueous dispersion obtained by the polymerization was 14%, the amount of the salt 24%, m ((NH4) 2SO4): m (NaCl) = 23.5: 0.5 and PDMC4% good. The prepared CPAM was used as filter aid for cultural paper production. The process parameters such as the amount of CPAM, contact time between CPAM and pulp, stirring speed and so on were optimized. When the application conditions are optimized, the filler retention of the slurry increases from 23.35% to 73.74% of blank, and the beating degree decreases from 39 ° SR to 25 ° SR.