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- Title
有机硅微胶囊粉末防水剂作用机理及性能.
- Authors
何燕; 张雄; 张永销; 夏晓丹
- Abstract
Organic silicone microcapsule powder water-repellent was prepared through film-forming microcapsule technology and spray drying technology. Performance of organic silicone powder water-repellent was evaluated in terms of relative surface oil content, productive rate, mean particle size, morphology, waterproof property, anti-penetrability property and influence on compressive strength and shrinkage rate of cement based materials. The effect of organic silicone microcapsule powder water-repellents was superior to that of liquid polydimethylsiloxane(PDMs). With 3% content(by mass) of octyl triethoxy silane substituting for PDMs, core material of organic silicone water-repellent was optimized, the water absorption rate of mortar after soaking for 48 h decreased to 3%-4%, impermeability pressure increased by 48.9%, and shrinkage rate decreased by 6. 8% at 90 d loading age. It is indicated from SEM analysis that organic silicone microcapsule powder water-repellent is of core-shell structure, with active organic silicone core materials and nano calcium carbonate fillers wrapped with polyvinyl alcohol and distributed inside. After hydrolysis, water-soluble polyvinyl alcohol is dissolved, and active organic silicone core material was gradually released, which participated in the formation of organic silicone hydrophobic membrane and made effects for waterproofing, and for the improvement of hydration degree and structure compactness.
- Publication
Jianzhu Cailiao Xuebao: Journal of Building Materials, 2015, Vol 18, Issue 3, p433
- ISSN
1007-9629
- Publication type
Article
- DOI
10.3969/j.issn.1007-9629.2015.03.013