Preparation and Characterization of TiO2/Organic Silica Sol Modified Fluorinated Poly(styrene-acrylate) Emulsion
SHI Shuyuan, AN Qiufeng*, QIU Jiayun
Shaanxi Provincial Key Laboratory of Light Chemical Additives, School of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
Abstract: In order to improve the hydrophobicity, thermal stability and mechanical properties of the fluorine-containing styrene-acrylic emulsion, Using butyl titanate (TBT) and γ-methacryloyloxypropyltrimethoxysilane (KH-570) as raw materials, TiO2/organosilica sol (TS) was prepared by sol-gel method. With butyl acrylate (BA), styrene (ST), dodecafluoroheptyl methacrylate (G04) and other acrylic functional monomers as the main raw materials through semi-continuous feeding method and seed emulsion polymerization, a fluorine-containing styrene-acrylic emulsion (TS-BHSAG) modified by TiO2/organosilicon sol was prepared. The effects of different TS contents on the emulsion conversion were discussed. The structure composition and application properties of the emulsion and latex film were studied by FTIR, nanometer particle size analyzer, stability analyzer, XPS, XRD, SEM, AFM, and TGA. The results show that when the TS content gradually increased, the emulsion conversion rate and stability showed a continuous downward trend. As the TS content increase, the average particle size of the emulsion increased from 55.58 nm to 106.16 nm. FTIR and XPS results show that Si-O-Si, Si-O-Ti, CF2 bonds were formed in the TS-BHSAG latex film, confirming the fact that preliminary synthesis of TS has been achieved, and it has been introduced into the polymer with G04. XRD results show that TS was dispersed in the acrylic resin matrix in an amorphous phase. It was observed by SEM and AFM that TS nanoparticles formed a peak-like rough structure on the surface of the latex film, which enhanced the hydrophobicity. TGA results show that when the thermal weight loss is 10% and 50%, the thermal decomposition temperatures of TS-BHSAG are 380.59 ℃ and 415.39 ℃, while at 600 ℃ the residual content increased from 4.78% to 8.56%. When the amount of TS added is 3%, the contact angle of the TS-BHSAG latex film is 121°, the adhesion is grade 1, the impact resistance is 50 cm, the hardness is 2H, and the water absorption rate is 6.1%.
通讯作者:
*安秋凤,陕西科技大学化学与化工学院教授、博士研究生导师。1994年西北轻工业学院应用化学专业硕士毕业,2001年华东理工大学应用化学专业博士毕业,2008年西北大学博士后流动站博士后,1984年至今于陕西科技大学任教。目前主要从事功能性有机硅材料与助剂的合成、应用及基础理论研究。发表有机氟硅方面的学术研究论文100余篇,包括Progress in Chemistry、Acta Polymerica Sinica、Chemical Journal of Chinese Universities、Progress in Organic Coatings等。395439701@qq.com
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2023, Vol. 37 
