TiO<sub>2</sub>/有机硅溶胶改性含氟苯丙乳液的制备及性能表征

doi:10.11896/cldb.21110053

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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%.

Key words： TiO₂/organosilicon modification emulsion polymerization fluorinated styrene acrylic emulsion hydrophobicity thermal stability

Published: 25 April 2023 Online: 2023-04-24

CLC number:

O63

Fund:Shaanxi Province Key R & D Program(2020ZDLGY13-11), and National Ministry of Science and Technology Key R & D Program(2017YFB0307700).

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	SHI Shuyuan
	AN Qiufeng
	QIU Jiayun

Cite this article:

SHI Shuyuan,AN Qiufeng,QIU Jiayun. Preparation and Characterization of TiO₂/Organic Silica Sol Modified Fluorinated Poly(styrene-acrylate) Emulsion[J]. Materials Reports, 2023, 37(8): 21110053-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21110053 OR http://www.mater-rep.com/EN/Y2023/V37/I8/21110053

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