Research Of Synthesis Of Silicone Resin And Its Application In Cosmetics For Hair

This paper focused on studying the synthesis of silicone resin by the traditional hydrolysis-polycondensation method, as well as emulsion polymerization of methyltrimethoxysilane(MTMS).The structure, particle size and morphology of silicone resin were characterized by fourier transform infrared (FTIR) ,scanning electron microscopy (SEM) and laser particle size analyzer. At the same time, its application in hair conditioner was also studied .Firstly, silicone resin microspheres were prepared using hydrolysis-polycondensation method , the influence of reaction parameters, such as pH value, the ratio of MTMS to water and stir had been investigated. It was found that the preferred preparation conditions were pH value 3.0~6.0,ratio of MTMS to water <1:20 in hydrolysis reaction and pH value 8.0~10.0 in condensation reaction. The particle size was decreased and the distribution became narrow with the increase of pH value in condensation reaction and the decrease of ratio of MTMS to water. The spheric silicone resin was obtained in the condition of condensation reaction without stir.Secondly, silicone resin emulsion was synthesized through the base-catalyzed emulsion polymerization of MTMS. The effect of the reaction parameters on the conversion of MTMS and stability of emulsion were investigated. And appearance of the latex was analyzed by optical microscope. The silicone resin emulsion with the highest conversion and the best stability was obtained, its average particle size was 7μm and the distribution was symmetrical, when the amount of mixed emulsifier(SDS and TX-10) was 30%, the mass ratio of SDS and TX-10 was 2︰1, catalyst(NaOH) was 6%, the temperature was 80℃and the reaction time was 9h.Finally, the silicone resin was applied in hair conditioner, all of the results confirmed that both the hair's wet and dry combing could be decreased evidently while the hair was dealed with hair conditioner with silicone resin,so it is possible to make use of silicone resin to improve the function of cosmetics.