Synthetise Of Silane Modified Cellulose And Carboxyl Polysiloxane Derivatives And Study Of The Application For Flame Retardant

The low addition of Silicon-containing flame retardants not only improve the flame Retar-dant properties, but also improve the processing performance, mechanical properties and heat resistance of materials. What’s more, the Silicon-containing flame retardants is no pollution to environment, and can be reused. Silicon-containing flame retardant technology is developing rapidly, especially those contain functional group of polysiloxane have become a hot research area of flame retardant for polymer material-ls.In this dissertation, cellulose, acrylic acid, methylbiethoxysilane (including triethoxy silane) and hydrogencontaining silicone oil were used as raw materials, silanization modified cellulose (SOCL) and two kinds of carboxyl polysiloxane were synthesized.The structure and morphology of SOCL was analyzed by FTIR and SEM, thermal stability was tested, and combined APP, SOCL’s application of carbon source on PP was investigated. The results showed that silane modified cellulose materials can effectively improve the thermal stability of cellulose, and when cellulose and triethoxy silicon hydrogen had a ratio of5:1, APP and SOCL had a ratio of3:1showed the best effect on PP. When the addition of flame retardant was24%, the oxygen index was increased from17.6%to28.5%on PP, and the UL-94level increased to V-0.The results of FTIR and1H-NMR silicone intermediates (SCOOH) containing carboxyl groups was successfully synthesized. The oil silicone flame retardant (L-PSCOOH) was gotten through hydrolysis method. The L-PSCOOH was blended with PC to study the effects of flame retardant on flame retardancy and mechanical properties of PC. The result showed that the addition of L-PSCOOH can effectively improve the flame retardancy of PC, when the two methyl two silane/intermediate SCOOH ratio was5:1, L-PSCOOH/PC (L-PSCOOH’s addition was1wt.%) composite LOI from the pure PC26.5%to35%, and the UL-94test by the pure PC V-Level2to V-0. L-PSCOOH test results on the mechanical properties of PC showed that the PC tensile strength and bending strength were slightly reduced by adding L-PSCOOH.By using IR and TGA, the chemical structure and thermal stability of the flame retardant S-PSCOOH were characterized. The results showed that the silicone flame retardant with carboxyl was successfully synthesized. It has good thermal stability, it can become carbon at high temperature. The flame retardant properties and mechanical properties of S-PSCOOH/PC composite material were characterized. The results showed that the LOI value was significantly increased by addition of flame retardant, when the addition was7%, the oxygen index of the composite material reached32.5%, and and through the UL-94V0(3.2mm), and flame retardant S-PSCOOH on tensile strength and bending strength of PC were decreased, when the flame retardant added7%, compared with pure PC, the tensile strength and bending strength were decreased by10.915MPa and17.593MPa, respectively. Through the scanning electron microscope and energy observation analysis, the carbon layer surface is uniform and compact, silicone of S-PSCOOH flame retardant migration from the inner to the surface, and form a protective layer containing-Si-O-bond and-Si-C-bond.