目的 通过试验研究表面改性方法制备包装纸用疏水剂。 方法 采用硅烷偶联剂 KH550 为表面处理剂,以疏水型气相二氧化硅为功能性填料, 制备了包装纸和纸板用疏水剂。 考察了各组分含量、固化处理对该疏水剂性能的影响。 结果 研究确定了最佳工艺配方( 质量分数) 为硅烷偶联剂KH550 2 . 0% ,气相二氧化硅 0 . 8% ,余量为无水乙醇。 制备的试样经 120 ℃ 固化后,实测其疏水涂层水接触角达 138 . 3 ^o ,涂层对纸板外观无影响,且附着力强。 结论 硅烷偶联剂-气相二氧化硅疏水剂可有效改善纸张表面的疏水性。

Objective To study the preparation of hydrophobic agent by surface modification. Methods Using silane coupling agent as the surface finishing agent, hydrophobic fumed silica power as the functional filler, a hydrophobic agent was prepared for wrapping paper and cardboard. The contents of each component and the curing processing of the hydrophobic agent were investigated. Results The optimal formula ( mass fraction) determined was, silane coupling (2. 0% ) , fumed silica power ( 0. 8% ) , and allowance for anhydrous ethanol. After curing the prepared sample at 120℃ , its contact angle was measured as 138. 3^o , the coating showed strong adhesion and had no influence on the appearance of cardboard. Conclusion The hydrophobic agent consisting of silane coupling agent and fumed silica power can effectively improve the hydrophobicity of the paper surface, and the curing processing has a significant role in improving the transparency and adhesion of the coating.