Nitrile Rubber Modified With Organosilicon And A New Curing System For Silicon Rubber

Organosilicon has various excellent properties because of its unique molecular chain structure, such as excellent high and low temperature resistance, aging resistance, electrical insulation, ozone resistance and physiological inertia, etc. This is cannot replace by other organic materials. Rubber modified with Organosilicon(polysiloxane, silane, etc.) via graft copolymerization modification, blending modification and crosslinking modification is a good way to obtain the excellent properties of organosilicon: air permeability, hydrophobic, weatherability, high and low temperature resistance, adhesiveness, etc. So rubber can be achieved high functional, refinement and differentiation to meet the increasingly diverse requirements of the current society. Therefore, the research of rubber modified by organosilicon not only provided us the rubber materials with the best performance, also promoted the development of organosilicon industry and rubber industry, which is a very meaningful research.In this paper the performance of low temperature resistance of acrylonitrile-butadiene rubber (NBR) was improved by blending acrylonitrile-butadiene rubber with fluorosilicone rubber (FSR). However, in the process of blending research, phase separation was occurred in the proportion of7/3(NBR/FSR). In order to improve the compatibility, NBR modified by mercapto-functionalized polymethyltrifluoropropylsilicone prior to blending was an effective technique. The mercapto-functionalized polymethyltrifluoropropylsilicone with low molecular weight was prepared according to controlled acid-catalyzed ring opening polymerization of1,3,5-tris[(3,3,3-trifluoropropyl)methyl]cyclotrisiloxane (D3F) and1,3-bis(mercaptomethyl)tetramethyldisiloxane. Branching of mercapto-functionalized polymethyltrifluoropropylsilicone onto NBR via thiol-ene reaction was carried out with2,2’-azobisisobutyronitrile as initiator in a Haake torque rheometer. The rheological properties of NBR branching obtained by varying dosages of polymethyltrifluoropropylsilicone in a Haake torque rheometer were studied using torque curves. The branching reaction was confirmed by1H NMR and energy dispersive X-ray spectra. The compatibility of a modified NBR/FSR blend at70/30ratio was also investigated. The mechanical properties were improved owing to better compatibility. The results of SEM and DMA also show that the branching chains acted as interfacial agents and exhibited good adhesion.In this paper, oganosilicon peroxide (three tertiary butyl peroxide vinyl silane) was added into silicon rubber. After molded and heated, we founded that the silicon rubber was vulcanization. Moreover, the result of vulcanization curve and DSC also show that silicone rubber can be vulcanized by three tertiary butyl peroxide vinyl silane. The breakdown product (CH2=CHSi(OH)3) was also participated in the silicon rubber crosslinking for provided additional cross-linked by a condensation reaction of the silanol groups. Furthermore, we also studied the influence on the properties of silicon rubber by varying dosage of three tertiary butyl peroxide vinyl silane and fumed silica.2,5-Bis(tert-butylperoxy)-2,5-dimethylhexane and three tertiary butyl peroxide vinyl silane blends as silicon rubber vulcanizing agent was also researched.