【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 ,是导致硅橡胶断裂的重要原因之一更多还原

【Abstract】 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.更多还原