Using methyltrimethoxysilane as a raw material, high-purity methylphenyldimethoxysilane was synthesized. Using this monomer and diphenyldimethoxysilane as raw materials, after complete co-hydrolysis, using hexamethyldisiloxane as a blocking agent and trifluoromethanesulfonic acid as a catalyst, various phenyl groups were obtained by equilibrium condensation. Molar content of methylphenyl silicone oil and diphenyl silicone oil. The effects of the changes in the molar content of phenyl on the properties of silicone oils, such as thermal stability, refractive index, and rheological properties, were studied. The results show that for diphenyl silicone oil, the refractive index is highest when the molar fraction of phenyl is 40%, reaching 1.5435, and the thermal stability is best when the molar fraction is 30%.
Using diphenyldimethoxysilane and dimethyldimethoxysilane as raw materials and 1,3-divinyltetramethyldisiloxane as a blocking agent, a vinyl-terminated phenyl silicone oil was prepared. A phenyl hydrogen-containing silicone oil was synthesized by using diphenyldimethoxysilane, dimethyldimethoxysilane, and methyldichlorosilane as raw materials and hexamethyldisiloxane as a blocking agent. A silicone rubber is obtained after the two components of vinyl-terminated phenyl silicone oil and phenyl hydrogen-containing silicone oil are cross-linked and cured under the action of a catalyst. The prepared film can transmit up to 97.14% under 460nm UV light. The properties of phenyl silicone rubber systems with different phenyl silicone oil compositions were explored, and the refractive index of phenyl silicone rubber was found to be positively related to the molecular weight of vinyl-terminated phenyl silicone oil.
Finally, several phenyl silicone oils were applied to the fabric treatment, and the mechanical properties, whiteness, etc. of the fabric before and after the treatment were compared and tested, as well as the fastness of the fabric treated with phenyl silicone oil. The study found that the tensile strength of the fabric after phenyl silicone oil finishing generally increased, but the whiteness slightly decreased. When the color cloth is treated with phenyl silicone oil, the soaping fastness, wet rubbing fastness and sun fastness of the treated color cloth are all improved by one level.
The changes of microstructure of the fabric before and after finishing were studied by scanning electron microscope (SEM) and X-ray diffraction (XRD).