阳离子型HDI三聚体乳液表面施胶剂的制备及其应用

Preparation and Application of Cationic HDI Trimer Emulsion Surface Sizing Agent

关键词:  表面施胶剂  乳化剂  HDI三聚体乳液  吸水性

Key Words:surface sizing agent  emulsifier  HDI trimer emulsion  Cobb value

摘要:以N，N-二甲基甲酰胺（DMF）为溶剂，以苯乙烯（St）、丙烯酸丁酯（BA）、甲基丙烯酸二甲氨乙酯（DM）为原料合成阳离子乳化剂，制备得到六亚甲基二异氰酸酯（HDI）三聚体乳液。讨论了乳化剂质量分数对乳液粒径及稳定性能的影响，并采用红外光谱、动态光散射测试对其结构、性能进行了表征；分析了施胶液浓度对施胶效果的影响，并测试了纸张的抗张强度、吸水性等性能。结果表明， 乳化剂质量分数为14%时，所制备的HDI三聚体乳液粒径小且稳定性能好；施胶液浓度为7%时，施胶纸张耐折度相较于未施胶原纸增加了1087.5%，纸张抗张强度和湿抗张强度最大可达到7.30 kN/m和3.69 kN/m，且纸张吸水性降低至15.6 g/m²，比原纸低了83.6%。所制得的HDI三聚体乳液表面施胶剂可以显著的提高纸张的施胶效果和物理性能。

Abstract:Hexamethylene diisocyanate(HDI） trimer emulsion was prepared using styrene(St）， butyl acrylate(BA）， dimethylamino ethyl methacrylate(DM） as raw materials， N，N dimethylformamide(DMF） as solvent.The effects of emulsifier concentration on the particle size and stability of the emulsion were discussed.The structure and properties of the emulsion were characterized by FT-IR， dynamic light scattering. The effect of sizing agent concentration on sizing performance and tensile strength，water absorption rate of the sizing paper were studied.The results showed that the prepared trimer emulsion had small particle size and good stability when the emulsifier content was 14%.And the folding endurance of sized paper increased by 1087.5% when the concentration of sizing agent was 7%.The wet and dry tensile strength index reached up to 7.30 kN/m and 3.69 kN/m， respectively， the Cobb value reduced to 15.6 g/m²， 83.6% lower than that of unsized paper.It was demonstrated that the as prepared HDI trimer emulsion surface sizing agent was able to significantly improve sizing efficiency and physical properties of sized paper．