知识与财富的链接
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０．０８μｍ、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３５７％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
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.
