4∶1双组分室温硫化硅橡胶的制备及性能研究  

Preparation and Properties of 4∶1 Two-Component Room-Temperature-Vulcanized Silicone Rubber

作　　者：罗元章 付子恩 戴飞亮 周波雄 洪展鹏 蒋金博 黄恒超 LUO Yuanzhang;FU Zien;DAI Feiliang;ZHOU Boxiong;HONG Zhanpeng;JIANG Jinbo;HUANG Hengchao(Guangzhou Baiyun Chemical Industry Co.,Ltd.,Guangzhou 510540,Guangdong)

机构地区：[1]广州市白云化工实业有限公司,广州510540

出　　处：《有机硅材料》2023年第3期21-25,共5页Silicone Material

基　　金：广州市白云区创新创业领军团队(BYCX-创新)。

摘　　要：以α,ω-二羟基聚二甲基硅氧烷为基胶、纳米碳酸钙为补强填料、二甲基硅油为增塑剂,添加交联剂、增粘剂和催化剂等制得一种4∶1双组分有机硅密封胶。研究了纳米碳酸钙用量、交联剂复配质量比、催化剂种类及用量对密封胶性能的影响。结果表明,其较佳的制备条件为A组分中α,ω-二羟基聚二甲基硅氧烷与纳米碳酸钙质量比1∶1.1,交联剂采用正硅酸甲酯与甲基三甲氧基硅烷低聚物按质量比1∶1复配,催化剂采用0.4份含硫有机锡。此时,双组分有机硅密封胶的拉断时间为25 min,消粘时间为75 min,邵尔A硬度为48度,拉伸强度为2.07 MPa,拉断伸长率为344%,剪切强度为2.06 MPa,90℃热处理7 d后力学性能基本保持稳定,硫化速率小幅降低。4∶1 two-component silicone sealant was prepared withα,ω-dihydroxy-poly dimethylsiloxane as the base material,nano-calcium carbonate as the reinforcing filler,and dimethylsilicone oil as the plasticizer,crosslinking agent,tackifiers and catalyst.The effects of the amount of nano calcium carbonate,mass ratio of crosslinking agent,type and amount of catalyst on the properties of sealant were studied.The results indicated that the optimal preparation conditions were when the mass ratio ofα,ω-dihydroxy-polydimethylsiloxane to nano-calcium carbonate in the component A reached 1∶1.1,and the crosslinking agent was mixed with methyl orthosilicate and methyl trimethoxy-silane oligomers at a mass ratio of 1∶1 with a catalyst of 0.4 phr of sulfur-containing organotin.Under this condition,the tensile break time of the two-component silicone sealant was 25 min,with a debonding time of 75 min,a Shore A hardness of 48A,a tensile strength of 2.07 MPa,an elongation at break at 344%,and a shear strength of 2.06 MPa.After heat treatment at 90℃for 7 days,the rubber has maintained comparatively stable mechanical properties,with slightly decreased vulcanization rate.

关 键 词：双组分 硅橡胶 交联剂 复配 催化剂 贮存稳定性 

分 类 号：TQ333.93[化学工程—橡胶工业]