Hexaphenyl cyclotrisilazane was synthesized from diphenyl dichlorosilane and ammonia with toluene as solvent.The effects of input material concentration, reaction temperature, ammonia flow rate and separation method o...Hexaphenyl cyclotrisilazane was synthesized from diphenyl dichlorosilane and ammonia with toluene as solvent.The effects of input material concentration, reaction temperature, ammonia flow rate and separation method on product yield were investigated.The structure of hexaphenyl cyclotrisilazane was characterized with FTIR and XRD.It was found that when diphenyl dichlorosilane concentration was 0.96 mol·L -1 , reaction temperature was 111—112℃,NH3 flow rate was 0.02 m3·h -1 , the yield of hexaphenyl cyclotrisilazane could reach 91.1%.Using ammonia water was better than hot filtration to weed out ammonium chloride at the period of product separation.It enhanced separation efficiency and simplified the process.At the same time it also decreased pollution to the environment by reducing volatile matter of toluene.展开更多
The effect of isocyanates(TDI, MDI, PAPI) on the adhesion of EPDM rubber was studied. The results indicate that isocyanates affect the adhesion strength obviously. After carbon-white, sulfur, accelerator and zinc oxid...The effect of isocyanates(TDI, MDI, PAPI) on the adhesion of EPDM rubber was studied. The results indicate that isocyanates affect the adhesion strength obviously. After carbon-white, sulfur, accelerator and zinc oxide were added to EPDM, the adhesion strengths were 1.922 MPa at 0.4% TDI, 1.830 MPa at 0.4% MDI, and 1.937 MPa at 0.4% PAPI, respectively. The EPDM rubber with PAPI has the highest adhesion strength.展开更多
文摘Hexaphenyl cyclotrisilazane was synthesized from diphenyl dichlorosilane and ammonia with toluene as solvent.The effects of input material concentration, reaction temperature, ammonia flow rate and separation method on product yield were investigated.The structure of hexaphenyl cyclotrisilazane was characterized with FTIR and XRD.It was found that when diphenyl dichlorosilane concentration was 0.96 mol·L -1 , reaction temperature was 111—112℃,NH3 flow rate was 0.02 m3·h -1 , the yield of hexaphenyl cyclotrisilazane could reach 91.1%.Using ammonia water was better than hot filtration to weed out ammonium chloride at the period of product separation.It enhanced separation efficiency and simplified the process.At the same time it also decreased pollution to the environment by reducing volatile matter of toluene.
文摘The effect of isocyanates(TDI, MDI, PAPI) on the adhesion of EPDM rubber was studied. The results indicate that isocyanates affect the adhesion strength obviously. After carbon-white, sulfur, accelerator and zinc oxide were added to EPDM, the adhesion strengths were 1.922 MPa at 0.4% TDI, 1.830 MPa at 0.4% MDI, and 1.937 MPa at 0.4% PAPI, respectively. The EPDM rubber with PAPI has the highest adhesion strength.
