Font Size: a A A

MQ Silicone Resin Reinforced Room Temperature Vulcanized Silicone Rubber

Posted on:2015-07-13Degree:MasterType:Thesis
Country:ChinaCandidate:J H LinFull Text:PDF
GTID:2181330422482147Subject:Materials science
Abstract/Summary:PDF Full Text Request
Room temperature vulcanized (RTV) silicone rubber has been receiving considerableattention and widely used in electronics, electrical, automotive, aerospace and medical andother fields for its excellent comprehensive properties such as good heat resistance, coldresistance, weatherability, chemical resistance, radiation resistance, electrical insulation andhydrophobicity etc. In this paper, transparent reinforcing addition type RTV silicone rubberand condensation type RTV silicone were prepared by use of vinyl MQ silicone resin andmethoxyl MQ silicone resin as reinforcing filler, respectively, and the main contents andresults are as follows:In chapter2, one kind of vinyl MQ silicone resin was prepared through the reactionamong tetraethoxysilane, hexamethyl disiloxane and divinyl tetramethyl disiloxane, whichexhibited disappearance of residual silanol, narrow molecular weight distribution andcomplete molecular structure. When the MQ silicone resin was filled in addition type RTVsilicone rubber in order to improve its mechanical properties, the generated rubber displayedlow viscosity, excellent mechanical properties and transparency, good solvent resistance andresistance to high and low temperature. When the mass ratio of vinyl silicone oil and vinylMQ silicone resin (M/Q=0.8, the content of vinyl was2.46%) was6:4, the tensile strength ofthe produced silicone rubber reached up to3.6MPa, tear strength, hardness, lighttransmittance, solubility and swelling ratio was4.8kN/m,60HA,93.8%,2.8%and1.79,respectively.In chapter3, a kind of methoxyl-capped MQ resin was synthesized through thehydrosilylation reaction of vinyl MQ resin and trimethoxysilane in the presence of platinumcatalyst, and then filled in the condensed type RTV silicone rubber in order to prepare MQresin reinforced silicone rubber. The generated rubber displayed good mechanical propertiesand transparency, perfect solvent resistance and resistance to high and low temperature, theresultant strength increased with the increase of methoxyl MQ resin’s mass fraction andmethoxyl mass fraction. While loading of40%mass fraction of MQ resin (M/Q=1.3, thecontent of methoxyl was7.57%), the tensile strength of the produced silicone rubber reachedup to4.0MPa, tear strength, hardness, light transmittance, solubility and swelling ratio was 7.9kN/m,43HA,90.1%,4.5%, and1.92, respectively. The thermo-gravimetric qualityresidual rate of the reinforcing rubber was up to21%.
Keywords/Search Tags:Addition type RTV silicone rubber, Condensation type RTV silicone rubber, Vinyl MQ silicone resin, Methoxyl MQ silicone resin, transparent reinforcement
PDF Full Text Request
Related items