两性无皂苯丙聚合物的制备及其乳化烷基烯酮（AKD）的应用研究

以甲基丙烯酰氧乙基三甲基氯化铵（DMC）为反应性阳离子单体,羟甲基丙烯酰胺（NMA）、甲基丙烯酸（MAA）为功能性单体,苯乙烯（St）、甲基丙烯酸甲酯（MMA）为硬性、亲油性单体,经无皂乳液聚合制备了两性无皂苯丙聚合物（ASAP）—AKD乳化剂,界面张力、红外光谱、差示扫描量热测试、热重分析表征该ASAP具有较强的表面活性且为共聚物并具有很好的热稳定性。讨论了ASAP乳化AKD的较佳配比为：m（AKD）/m（ASAP）=4.5/1,该配比下ASAP/AKD复合乳液具有分散、放置稳定性良好的特点;考察了在阳离子淀粉和阳离子聚丙烯酰胺双元助留剂下,ASAP/AKD复合乳液用量对草木混合浆进行浆内施胶纸张的施胶度、强度的影响,结果表明ASAP/AKD复合乳液的较佳施胶用量（占绝干浆）为：w（ASAP/AKD）=0.2%～0.3%;w（ASAP/AKD）=0.2%时纸张强度最大。

Preparation of amphoteric soap-free styrene-acrylate copolymer and its application in emulsification of AKD

The amphoteric styrene-acrylate copolymer （ASAP） was prepared by the surfactant-free copolymerization through using functional monomers N-methyl acrylamide （NMA）,methacrylic acid （MAA）,hard and lipophilic monomer styrene （St）,methyl methacrylate （MMA）,self-emulsified reactive cationic monomer methacryloyloxyethyl trimethyl ammonium chloride （DMC）.ASAP were characterized by interfacial tensiometer,Fourier transform infrared spectrum （FT-IR）,differential scanning calorimetry （DSC） and thermogravimetry analysis （TG）,the result indicates ASAP has good surface activity and it is copolymer and it has better thermal stability.It was discussed that ASAP emulsified alkyl ketene dimmer （AKD）,the obtained optimum weight ratio m（AKD）/m（ASAP） =4.5/1,formed ASAP/AKD hybrid emulsions with better dispersion and storage stability.In the presence of cationic starch （CS） and cationic polyacrylamide （CPAM） acting as double retention agents,the influences of using dosage of composite emulsion about ASAP/AKD in sizing effect and surface strength were investigated in the sizing experiments in the case of straw and wood mixed stock,the obtained optimum using dosage for dry pulp is w（ASAP/AKD）=0.2%～0.3%,w（ASAP/AKD）=0.2%,sizing performance and surface strength is better in sizing paper sheet.