乳液型丙烯酸树脂改性阳离子淀粉增干强剂的制备及性能

Preparation and Properties of Dry Strength Agents the Acrylate Resin Modified Cationic Starch

淀粉与阳离子醚化剂在碱性介质和氧化剂存在下 ,搅拌加热至 6 5～ 70℃ ,进行氧化降解和阳离子化反应 ,反应时间为 2h。再加入丙烯酸及丙烯酸酯单体于 80～ 85℃进行接枝共聚 ,m (玉米淀粉 )∶m (改性单体 ) =1 0∶0 8时 ,得到的乳液型丙烯酸树脂接枝共聚阳离子淀粉增干强剂的增强效果最好 ,对增加纸张干强度和耐撕裂度有明显效果 ,用量为绝干浆质量的 0 4%～ 0 .5 %时 ,可使纸的干强度增加 15 %以上 ,耐撕裂度提高 8%以上。并用IR、SEM。

The oxidative degradation and cationization reaction of starch were carried out at 65 - 70 °C for 2 h and then monomers of acrylate were grafted on the starch chain in the ratio m(starch): m(monomers) = 1.0:0.8 at 75 - 80 °C for 2 h. The initiator amounted to 4% - 5% (w/w) of monomers. The grafted cationic starch showed obvious strengthening effect to increase the dry strength and the tearing resistance of paper more than 15% and 8% respectively. The structure and properties of the modified copolymers were characterized by methods of IR, DSC, SEM etc.