Preparation and Performance Study of Modified Silica Sol/Phenolic Resin
Preparation and Performance Study of Modified Silica Sol/Phenolic Resin
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DOI：
10.15376/biores.16.4.6669-6683
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发表时间：
2021-11-01
期刊：
影响因子：
1.5
通讯作者：
Li, Chunfeng
中科院分区：
文献类型：
--
作者：
Zhang, Yinliang;Liu, Yu;Li, Chunfeng
以硅溶胶、苯酚、甲醛等为原料，采用原位聚合法制备硅溶胶/酚醛树脂。讨论了硅溶胶含量对复合树脂粘度、固含量等性能的影响。采用激光粒度分析仪、红外光谱仪、热重分析仪、流变仪等对产物的结构和性能进行了表征和测试。结果表明，随着硅溶胶含量的增加，复合树脂的粘度增加，而固含量和游离甲醛含量则呈相反的趋势。激光粒度分析表明，当硅溶胶的用量为40%时，复合树脂的粒度分布比较均匀。傅立叶变换红外光谱分析表明硅溶胶与酚醛树脂之间形成了新的Si-O-C化学键。TG分析表明，当改性硅溶胶的加入量为40%时，（10%失重）从294.8 ℃提高到324.4 ℃，残留量从55.2%提高到60.2%;流变学分析表明，硅溶胶含量为40%时，具有较好的流动性能，为复合树脂渗透木材创造了条件。
This study used silica sol, phenol, formaldehyde, etc. as raw materials to prepare silica sol/phenolic resin based on in-situ polymerization. The influence of silica sol content on the viscosity, solid content, and other properties of the composite resin were discussed. The structure and performance of the product were characterized and tested via laser particle size analyzer, infrared spectrum analyzer, thermogravimetric (TG) analyzer, and rheometer. The results show that the viscosity of the composite resin increased with increased silica sol content, and the solid content and the free formaldehyde content exhibited the opposite trend. The laser particle size analysis revealed that when the amount of silica sol was 40%, the particle size distribution of the composite resin was relatively uniform. Fourier transform infrared analysis illustrated a new chemical bond of Si-O-C formed between silica sol and phenolic resin. TG analysis showed that when the amount of modified silica sol was added at a 40% level, the decomposition temperature of composite resin (10% weight loss) increased from 294.8 to 324.4 degrees C, and the residual amount increased from 55.2% to 60.2%; rheological analysis revealed that when the content of silica sol was 40%, it had better flow properties, creating conditions for the composite resin to penetrate the wood.