不同硅源所得聚丙烯酸/二氧化硅复合乳液的性能
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摘要
以丙烯酸类单体为主要原料,采用核-壳乳液聚合法并在反应的后期加入γ-甲基丙烯酰氧基丙基三甲氧基硅烷(KH-570)作为改性剂,合成了表面具有硅羟基的聚合物模板乳液。随后通过正硅酸乙酯(TEOS)或硅溶胶来引入二氧化硅,得到聚合物/SiO_2复合乳液。考察了SiO_2加入量、KH-570加入量和SiO_2来源对乳液及其涂膜性能的影响,得出KH-570加入量为1.0 g,SiO_2添加量(固含量)与模板乳液中粒子质量之比为1∶40,且SiO_2来源于TEOS时,所得乳液的稳定性及其涂膜的硬度、透光率等性能都最好。
A polymer emulsion with silanol groups at the surfaces of its particles was prepared by core–shell polymerization from acrylic monomers with 3-(trimethoxysilyl)propyl methacrylate(KH-570) added at the later stage of the reaction as a modifier, and then used as a template to synthesize a polymer/SiO_2 composite emulsion by introduction of SiO_2 derived from tetraethyl orthosilicate(TEOS) or colloidal silica suspension. The effects of the dosages of SiO_2 and KH-570 as well as the silicate sources on properties of the emulsion and its film were studied. The emulsion obtained with TEOS as SiO_2 source and KH-570 1.0 g at a ratio of 1:40 for solid SiO_2 content to the mass of particles in the template emulsion was the most stable,and its film had the highest hardness and the best transmittance.
A polymer emulsion with silanol groups at the surfaces of its particles was prepared by core–shell polymerization from acrylic monomers with 3-(trimethoxysilyl)propyl methacrylate(KH-570) added at the later stage of the reaction as a modifier, and then used as a template to synthesize a polymer/SiO_2 composite emulsion by introduction of SiO_2 derived from tetraethyl orthosilicate(TEOS) or colloidal silica suspension. The effects of the dosages of SiO_2 and KH-570 as well as the silicate sources on properties of the emulsion and its film were studied. The emulsion obtained with TEOS as SiO_2 source and KH-570 1.0 g at a ratio of 1:40 for solid SiO_2 content to the mass of particles in the template emulsion was the most stable,and its film had the highest hardness and the best transmittance.
引文
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[2]WADA T,INUI K,URAGAMI T.Properties of organic-inorganic composite materials prepared from acrylic resin emulsions and colloidal silicas[J].Journal of Applied Polymer Science,2006,101(3):2051-2056.
[3]TISSOT I,NOVAT C,LEFEBVRE F,et al.Hybrid latex particles coated with silica[J].Macromolecules,2001,34(17):5737-5739.
[4]刘长利,吴文健,满亚辉,等.光固化有机硅/纳米SiO2杂化材料的制备和表征[J].材料科学与工程学报,2006,24(6):808-810,820.
[5]张佼如,皮丕辉,文秀芳,等.纳米二氧化硅/聚丙烯酸酯复合乳液的合成及其涂膜性能[J].电镀与涂饰,2012,31(9):59-62.
[6]胡哲.纳米二氧化钛/丙烯酸酯核-壳复合乳液的制备及其性能研究[D].广州:华南理工大学,2012.
[7]ZHENG J P,ZHU R,HE Z H,et al.Synthesis and characterization of PMMA/SiO2 nanocomposites by in situ suspension polymerization[J].Journal of Applied Polymer Science,2010,115(4):1975-1981.
[8]陈师,吉静.高SiO2含量硅溶胶/聚丙烯酸酯复合乳液的制备[J].北京化工大学学报,2005,32(3):57-60,65.
[9]WATANABE M,TAMA T.Acrylic polymer/silica organic-inorganic hybrid emulsions for coating materials:role of the silane coupling agent[J].Journal of Polymer Science:Part A:Polymer Chemistry,2006,44:4736-4742.