超细碳酸钙填料在脱丙酮型RTV-1硅橡胶中的应用研究  

Application of ultrafine calcium carbonate powder in deacetonized RTV-1 silicone rubber

作　　者：贺火明[1] 潘慧铭[1] 王耀林 李和昌 

机构地区：[1]华南理工大学材料学院,广东广州510641 [2]广州白云粘胶厂,广东广州510510

出　　处：《橡胶工业》2000年第6期335-337,共3页China Rubber Industry

摘　　要：研究了碳酸钙粒径大小及其在体系中的分散状况对脱丙酮型RTV 1硅橡胶性能的影响。结果表明 ,采用粒径小于 0 0 8μm、表面经脂肪酸处理的超细碳酸钙可制备拉伸强度大于 1 35MPa,扯断伸长率大于35 7%且具有较好触变性能的脱丙酮型RTV 1硅橡胶 ;混料过程中采用较高的脱水温度易产生碳酸钙密集的聚集体 ,使硅橡胶拉伸强度和扯断伸长率下降 ;体系中分散不均匀的聚集体可能容易诱发应力缺陷 。The influence of the particle size and dispersion of ultrafine calcium carbonate on the properties of the deacetonized RTV 1 silicone rubber was studied.The results showed that the deacetonized RTV 1 silicone rubber with tensile strength >1.35 MPa,elongation at break >357% and better thixotropy could be obtained by adding a fatty acid treated ultrafine calcium carbonate with particle size <0.08 μm;the higher dehydration temperature during mixing might cause concentrated calcium carbonate aggregates resulting in lower tensile strength and elongation at break of silicone rubber;and the ununiformly dispersed aggregates in the system could cause stress concentration resulting in premature fracture of silicone rubber.

关 键 词：超细碳酸钙 脱丙酮型 RTV-1 硅橡胶 填充补强剂 

分 类 号：TQ330[化学工程—橡胶工业]