以聚乙烯醇为胶体保护剂,正硅酸乙酯为前躯体,通过无皂乳液聚合法合成了SiO_2/聚丙烯酸酯杂化材料纸张表面增强剂.通过红外光谱(IR)、差示扫描量热(DSC)、热重分析(TGA)和透射电镜(TEM)对杂化材料进行表征,结果表明纳米SiO_2和丙烯酸酯之间产生了化学键的结合,无机相的引入使杂化材料的热分解温度升高.初步应用实验结果表明,当增强剂用量为1%时,纸张的环压指数提高36%,抗张强度提高30%,撕裂度提高31%,拉毛强度提高30%.
SiO_2/polyacrylate hybrid materials paper strength agent was prepared by in-situ emulsifier-free emulsion polymerization with tetraethoxysilane(TEOS) as a silica component precursor and polyvinyl alcohol(PVA) as polymeric colloid stabilizer. The hybrid material was characterized by fourier transform infrared (FT-IR),differential scanning calorimeter (DSC). thermal gravimetric analyzer (TGA) and transmission electron microscope (TEM).The results indicated that there were chemical bonds between SiO_2 and polyacrylate, and that the thermal stability and the glass transition temperature (T_g) in polyacrylate/SiO_2 was 8℃ higher compared to pure polyacrylate. Moreover, the applied properties of the paper were measured as follows when the dosage of the strength agent was 1%: ring crush index of paper increased by 36%, paper tensile strength increased by 30%, and tearing strength and picking velocity increased by 31% and 30% respectively.
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