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Preparation and Application of Cationic HDI Trimer Emulsion Surface Sizing Agent
  
DOI：10.11980/j.issn.0254-508X.2018.08.003
Key Words:surface sizing agent  emulsifier  HDI trimer emulsion  Cobb value
Fund Project:陕西省重点研发计划项目(2017GY-154)；陕西省重点实验室项目(16JS011)。
Author NameAffiliation
FEI Gui-qiang1 1.Shaanxi University of Science & Technology，Xi’an， Shaanxi Province，710021 
HAO Li-juan1 1.Shaanxi University of Science & Technology，Xi’an， Shaanxi Province，710021 
QIN Shu-di1 1.Shaanxi University of Science & Technology，Xi’an， Shaanxi Province，710021 
MA Jian2 2.The First Oil Production Plant，Changqing Oilfield Branch Company of Petro China，Yan’an， Shaanxi Province，716000 
ZHU Ke3 3.Weinan Normal University，Weinan，Shaanxi Province，714099 
WANG Hai-hua1，* 1.Shaanxi University of Science & Technology，Xi’an， Shaanxi Province，710021 
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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．
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