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利用异佛尔酮二异氰酸酯(IPDI)和纳米SiO2表面—OH基团反应的特点,制备了表面含—NCO基团的纳米SiO2,用端羟基聚丙二醇醚(PPG)对其扩链并进一步和丙烯酸羟乙酯(HEA)反应,制备了丙烯酸酯封端、IPDI和PPG连接纳米SiO2粒子的纳米SiO2杂化材料.用红外光谱(FTIR)、热失重(TGA)和扫描电镜(SEM)对接枝前后纳米SiO2进行表征分析,结果表明,IPDI、PPG和HEA以化学键的形式接枝于纳米SiO2表面,接枝率为92.2%.改性后的纳米SiO2团聚现象明显得到改善.虽然整个杂化材料的粒径超过了纳米材料的定义范围,但纳米SiO2粒子仍然保持纳米尺寸,粒度分布为30～50 nm.和未改性的纳米SiO2相比,将3%的改性纳米SiO2加入紫外光固化涂料中,涂料黏度从55 mPa.s降低到48 mPa.s(25℃);在相同的UV固化时间内,C C双键转化率提高;固化膜的铅笔硬度从3 H提高到4 H;经300 r/min的耐磨性能测试,磨耗量从6.2 mg降低到4.6 mg.
Using the reaction of isophorone diisocyanate (IPDI) and nano-SiO2 on the surface of -OH groups, nano-SiO2 with -NCO group on the surface was prepared, and its end-hydroxyl polypropylene glycol ether (PPG) Acrylic acid hydroxyethyl acrylate (HEA) was used to prepare nano-SiO2 hybrid materials with acrylate-capped, IPDI and PPG-linked nano-SiO2 particles. FTIR, TGA and SEM The results showed that IPDI, PPG and HEA were chemically grafted on the surface of nano-SiO2 with a grafting rate of 92.2%, and the agglomeration of modified nano-SiO2 obviously improved.Although the whole hybridization The particle size of the material exceeds the defined range of the nanomaterials, but the nano-SiO2 particles still maintain the nano-size and the particle size distribution is 30-50 nm. Compared with the unmodified nano-SiO2, 3% of the modified nano-SiO2 is added into the ultraviolet In the cured coating, the viscosity of the coating decreased from 55 mPa.s to 48 mPa.s (25 ° C); the CC double bond conversion increased with the same UV curing time; the pencil hardness of the cured film increased from 3 H to 4 H; After 300 r / min wear resistance test, wear reduced from 6.2 mg to 4.6 mg.