细乳液聚合制备纳米SiO2PSt及其对丙烯酸类浆料改性

 溶液-凝胶法制备纳米SiO2粒子，利用MPS对纳米SiO2粒子进行偶联处理。以苯乙烯为单体，十六烷基三甲基溴化铵为乳化剂，环己烷为助稳定剂，通过细乳液聚合制得纳米SiO2/PSt粒子。改变乳化剂用量，得到不同稳定性及粒径的杂化粒子，以FTIR、DLS和TEM对纳米SiO2及SiO2/PSt表征，结果显示：经MPS修饰的纳米SiO2平均粒径为38.7 nm；当乳化剂用量为0.035 g时，细乳液稳定性较好，粒径分布较窄，平均粒径为148.8 nm。将所制得的细乳液加入丙烯酸类浆料SX-5中，对其进行改性。测试SX-5和纳米改性SX-5浆料的粘度，并分别对T/C涤棉纱进行上浆试验，测试浆纱断裂强力、断裂伸长和耐磨性能，得出结论：改性前后的浆料粘度基本无变化，而上浆率有一定提高，提高8.9 %；改性后的浆料浆纱性能较原浆料有一定提高，浆纱断裂强力、断裂伸长和耐磨分别提高4.7 %、- 6.5 %和7.0 %。

Synthesis of nano-SiO2/PSt via miniemulsion polymerization and modification of polyacrylate sizes with it

Nano-SiO2 particles were prepared via Sol-Gel method and then they were coupled with MPS. Miniemulsion polymerization, using styrene as monomer, CTAB as emulsifier and cyclohexane as costabilizer, was processed to prepare nano-SiO2/PSt microspheres. A series of nano-SiO2/PSt miniemulsion, with different stability and particle size, were prepared with different contents of emulsifier. Nano-SiO2 and nano-SiO2/PSt were characterized by means of FTIR, DLS and TEM. The results showed that: The average particle size of MPS-modified Nano-SiO2 was 38.7 nm; when the content of CTAB was 0.035 g, the prepared miniemulsion, with an average particle size of 148.8 nm, had a good stability and a narrow particle size distribution. Then the prepared miniemulsion was charged into the polyacrylate sizing agent SX-5 to form the nano-modified SX-5. The viscosities of SX-5 and nano-modified SX-5 were determined. Finally, T/C blended single yarns were sized by these two sizing agents, and breaking strength, breaking elongation and abrasion resistance of sized yarns were examined. The results showed that: There was tiny difference of viscosity between SX-5 and nano-modified SX-5, but the sizing rate of nano-modified SX-5 improved 8.9 %; Sizing properties of T/C yarns sized by nano-modified SX-5 improved in comparison with SX-5, since breaking strength, breaking elongation and abrasion resistance improved 4.7 %, - 6.5 % and 7.0 % respectively.