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将纳米碳酸钙(简称纳钙)分别与重质碳酸钙(简称重钙)、粉煤灰进行复配,制备了单组分RTV-1型(室温固化-1型)硅酮密封胶,并对密封胶的表干时间、硬度、拉伸剪切强度、拉伸强度和断裂伸长率等进行了测定。研究结果表明:重钙、粉煤灰可部分取代纳钙,对表干时间影响不大,但不同程度地增加了密封胶的硬度、降低了拉伸强度和断裂伸长率;重钙的引入降低了密封胶的拉伸剪切强度,当m(纳钙)∶m(重钙)>1∶4(相对于复配填料质量而言)时,密封胶的综合性能仍满足国家标准要求;粉煤灰的增强效果优于重钙,当m(纳钙)∶m(粉煤灰)=4∶1(相对于复配填料质量而言)时,密封胶的拉伸剪切强度优于纳钙单独填充体系;在试验范围内,粉煤灰可取代纳钙单独引入密封胶中。
One-component RTV-1 (RTV-1 type) silicone sealant was prepared by compounding nano-CaCO3 with CaCO3 and fly ash, respectively. The sealant dry time, hardness, tensile shear strength, tensile strength and elongation at break were measured. The results showed that: TSP and fly ash could partly replace calcium and little effect on the drying time, but increased the hardness of sealant and reduced the tensile strength and elongation at different extents. The introduction of TSP The tensile shear strength of the sealant is reduced, and the comprehensive performance of the sealant still meets the requirements of the national standard when m (calcium): m (calcium)> 1: 4 (relative to the mass of the compounding filler) The reinforcing effect of fly ash is better than that of heavy calcium, and the tensile shear strength of the sealant is better than that of m (calcium nitrate): m (fly ash) = 4: 1 Calcium alone filling system; within the scope of the test, fly ash instead of calcium can be introduced into the sealant alone.