超支化聚酯接枝超细二氧化硅改性环氧树脂研究  

Study of modifying expoxy by hyper-branched polyester grafted ultrafine silica

作　　者：杨亮亮[1] 杨隽[1] 匡志娟[1] 高玉军[1] 

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430073

出　　处：《应用化工》2011年第9期1492-1495,1499,共5页Applied Chemical Industry

基　　金：国家杰出青年基金资助项目(50725414)

摘　　要：在催化剂存在下,二羟甲基丙酸(DMPA)为反应单体,可成功地接枝超支化聚酯到经硅烷偶联剂γ-氨丙基三乙氧基硅烷(KH-550)处理过的超细二氧化硅表面。通过IR、TG、氨基分析、亲水性测试等表征其性能。结果表明,每1.5 g二氧化硅和0.65 g KH-550反应表面氨基含量最多,为7.986 mmol/g;每1.00 g KH-550改性二氧化硅和3.00 g DMPA反应产物接枝率最高,为85.55%,产物亲油疏水性最好,使液体石蜡黏度改变最小。不同代超支化聚酯改性二氧化硅固化环氧树脂,漆膜性能表明,4.00 g DMPA改性二氧化硅固化环氧树脂漆膜铅笔硬度和柔韧性增加,改性效果最优。Hyper-branched polyester can be sucessfully grafted onto the ultra silica modified by the silane coupling agent 3-arninopropyltriethoxysilane （KH-550） , with dimethylol propinic acid （DMPA） as monomer in the prensence of catalyst. The properties of the SiO2 were characterized by IR, TG, titration of amino groups analysis and hydrophilicity tests. Results showed that maximum level of amino was 7. 986 mmol/g,under the condition that 0.65 g KH-550 reacted with 1.50 g Si02. The ultimate grafting rate of the hyper-branched polyester was 85.55% ,per 1.00 g KH-550 modified SiO2 reacted with 3.00 g DMPA,the product showed the best lipophilic-hydrophobicity, and made the smallest change of viscosity adding into the liquid paraffin. Curing the expoxy with different generations of polyester modified silica, the film performance properties indicated that the usage of 4.00 g DMPA modified silica improved the pencil hardness as well as the film flexibility, and modifying effect was the best.

关 键 词：超细二氧化硅 超支化聚酯 环氧树脂 漆膜 接枝率 

分 类 号：TQ317[化学工程—高聚物工业] TQ127.2