Moisture-curable rubbers

1.氨丙基三乙氧基硅烷（APS）与二月桂酸二丁基锡（DBTDL）复配的氯醚橡胶（ECO）可湿固化，其网链密度达5 × 10 - 4 mol/cm 3，最大拉伸强度为7.0 MPa。由于ECO.2的亲水性，该弹性体显示出极高的吸湿性。氯化聚乙烯（CPE）的湿固化氯化聚乙烯在氯中的低反应活性阻止了与APS的接枝反应，即使在加入DBTDL后也是如此。因此，CPE不能与水分固化. APS与DBTDL混炼的氯丁橡胶（CR）为湿固化，其网链密度为3 × 10 - 4 mol/cm 3，最大拉伸强度为10 MPa。但是，CR与APS之间不可避免的预硫化反应降低了拉伸强度.结论含卤聚合物、1-氯丁二烯-丁二烯共聚物、氯化丁基橡胶、溴化丁基橡胶、氯磺化聚乙烯、氯醚橡胶和氯丁橡胶在APS和DBTDL存在下可湿固化。所得弹性体给出了相对较高的拉伸强度，这是与那些通常的热硫化橡胶。湿固化反应的研究使我们能够确定最佳的反应条件。白炭黑复合材料对湿硫化橡胶有很好的补强效果。从这些结果，我们可以证明湿固化的可行性。

1. Moisture-cure of epichlorohydrin rubber (ECO) ECO compounded with aminopropyltriethoxysilane (APS) and dibutyltin dilaurate (DBTDL) was moisture-curable; the resulting network-chain density attained 5 x <10^(-4)> mol/ <cm^3> and the maximum tensile strength was 7.0 MPa. This elastomer showed an extremely high hygroscopic nature due to hydrophilicity of ECO.2. Moisture-cure of chlorinated polyethylene (CPE)Low reactivity in chlorine of CPE prevents grafting reaction with APS even after an addition of DBTDL. And thus, CPE cannot be cured with moisture.3. Moisture-cure of chloroprene rubber (CR)CR compounded with APS and DBTDL was moisture-curable; the network-chain density was 3 x <10^(-4)> mol/ <cm^3> and the maximum tensile strength was 10 MPa. However, an unavoidable prevulcanization reaction between CR and APS reduced the tensile strength.4. ConclusionHalogen containing polymers, 1-chlorobutadiene-butadiene copolymer, chlorinated butyl rubber, brominated butyl rubber, chlorosulfonated polyethylene, epichlorohydrin rubber, and chloroprene rubber were moisture-curable in the presence of APS and DBTDL. The resulting elastomers gave relatively high tensile strength which were comparable with those of usual heat-vulcanizated rubbers. Investigations of the moisture-curing reaction enabled us to determine the optimal reaction conditions. Silica composites gave the moisture-cured rubber high reinforcing effects. From these results, we could prove a feasibility of moisture-cure.