摘要
以正硅酸乙酯和γ-甲基丙烯酰氧基丙基三甲氧基硅烷为原料,采用溶胶-凝胶方法制备了一系列不同摩尔比的SiO_2溶胶。将溶胶与活性稀释剂三丙二醇二丙烯酸酯、环氧丙烯酸酯树脂混合得到UV固化杂化涂料。对杂化涂料的保存稳定性进行了详细分析;利用红外光谱对溶胶及涂料结构进行了表征;通过热重分析、微量量热(MCC)等测试方法研究了SiO_2含量对杂化涂层热稳定性、阻燃性能及力学性能的影响。结果表明,添加SiO_2有利于提高杂化涂层的热稳定性和力学性能。当SiO_2溶胶质量分数为50%时,杂化涂层的硬度从3H增加到6H。耐磨系数从0.0852g/100r下降到0.0606g/100r。MCC分析显示,溶胶质量分数为40%的杂化涂层热释放峰值和热释放总量较有机涂层分别下降了41.98%和41.12%,表现出良好的阻燃特性。
A series of SiO2 sols were synthesized with tetraethylorthosilicate （TEOS） and γ- methacryloxypropyltrimethoxysilane （NIPS） as precursors via the acid-catalyzed sol-gel method. The stable SiO2/ TPGDA mixing dispersions were obtained by vacuum distillation process. Then the dispersions, reactive diluent and oligomers were mixed together to prepare UV-curable organic-inorganic hybrid coatings. The storage stability of hybrid coatings was discussed in detail. The chemical structure of SiO2 sol and hybrid coatings was characterized by FT-IR. The effects of SiO2 contents on thermal stability, flame retardancy and mechanical properties of hybrid coatings were investigated by the thermogravimetric analysis（TGA）, microcalorimeter （MCC） and cone calorimeter test, etc. The results show that thermal stability and mechanical properties of hybrid coatings are improved significantly. With increased the content of SiO2 sol from 0 to 50%, a increase of pencil hardness from 3H to 6H and a decrease of abrasion resistance from 0. 0852g/100r to 0.0606g/100r are observed. The MCC test indicates that the hybrid coatings show excellent flame retardancy. The peak heat release rate （PHRR） and total heat release（THR） of the hybrid coatings with 40% SiO2 contents decrease 41.98% and 41.12% compared with organic coating.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2017年第11期53-59,共7页
Polymer Materials Science & Engineering
基金
国家科技支撑计划项目(2014BAE12B02)
上海市先进复合材料设计与制造专业技术服务平台(16DZ2292100)
关键词
UV固化
溶胶
杂化涂料
微量量热
阻燃性能
UV-curable
sol
hybrid coatings
microscale combustion calorimeter
flame retardancy
