以丙烯酸十八酯为主要单体,环己烷为溶剂,偶氮二异丁腈为引发剂,合成一种长链丙烯酸酯共聚物溶液.并以失水山梨糖醇脂肪酸酯(Span-80)/脂肪醇聚氧乙烯醚为复合乳化剂,将上述共聚物溶液制备成乳液.将聚合物乳液作为剥离剂加入天然乳胶,对比加入前后天然乳胶的表面张力、成膜时间、胶膜力学强度、吸水率及剥离强度等性能.结果表明,加入聚合物乳液作为剥离剂后,天然乳胶的表面张力由46.7 mN/m降低到37.2 mN/m.在25℃时成膜时间为15h,平均拉伸强度可达4.225 MPa,断裂伸长率为940.120％,吸水率为12.82％,剥离强度降至0.32 kN/m.形成的乳胶薄膜在纸张表面可以完全剥离,且不损害纸纤维.
A long chain acrylate copolymer solution was prepared using octadecyl acrylate as main monomer,cyclohexane as solvent,azobisisobutyronitrile as initiator.The emulsion was also prepared based on the copolymer solution by using sorbitol fatty acid ester(Span-80)/fatty alcohol ethoxylates as emulsifiers.The polymer emulsion was added to natural latex as release agent.The surface tension,forming time,film mechanical strength and water absorption properties of natural latex were all measured.The results show that after addition of polymer emulsion,the surface tension decreases from 46.7 mN/m to 37.2 mN/m.At 25 ℃,the film deposition time is 15 h,the average tensile strength is up to 4.225 MPa,the elongation at break 940.120％,and the water absorption 12.82％,the peel strength is down to 0.32 kN/m.The latex film formation can be completely peeled off the paper surface without any damage to paper fibers.
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