纸张表面施胶剂的应用实验设计

Application experiment design of surface sizing agent

利用DOE(Design of Experiment)实验设计方法中的Plackett-Burman和全因子设计方法,采用乳液聚合法,以酶转化淀粉作为乳化剂,以聚苯乙烯、丙烯酸和丙烯酸丁酯作为单体合成纸张表面施胶剂。结果表明:引发剂用量(A)、反应温度(B)、滴加时间(C)以及单体用量与反应温度的交互作用(AC)是影响成纸表面强度的关键因子;建立了纸张表面强度(S)与各关键因子之间的数学模型:S=-17.375 0+196.259A+1.5B+48.375 0C-41.25AC,并对数学模型进行了验证。最佳合成条件为:淀粉酶反应温度80℃,淀粉酶反应时间10 min,淀粉与单体质量比为1∶1,丙烯酸的质量分数为2%,单体苯乙烯与丙烯酸丁酯质量比为6∶1,引发剂H2O2与FeSO4质量比为1∶1。合成表面施胶剂的固含量(质量分数)为26.13%,黏度为28.3 mPa.s,玻璃化温度为70.72℃。

Emulsion polymerization was adopted to synthesize the surface sizing agent with polystyrene,acrylic acid,butyl acrylate as monomers and enzyme-converted starch as a emulsifier,using Plackett-Burman and total divisor design as the design of experiment（DOE）.The results showed that dosage of evocation agent（A）,reaction temperature（B）,charging time（C） and the interaction（AC） between dosage of evocation agent and titration time were the key factors affecting the surface strength（S） of paper.The relationship among them was expressed with a mathematics model：S=-17.375 0＋196.259A＋1.5B＋48.375 0C-41.25AC and the experiment confirmed its correct ness.The optimum reaction conditions of enzyme was 80 ℃,10 min and the mass ratio of it to monomer quality was 1∶1.The optimum synthesis condition was 2 % acrylic acid,the ratio of polystyrene to butyl acrylate 6∶1 and the mass ratio of H2O2 to FeSO4 1∶1.The surface sizing agent＇s solid content was 26.13 %,viscosity was 28.3 mPa·s and the glass transition temperature was 70.72 ℃.