Silica gel composition and preparation method thereof

Abstract

The invention provides a silica gel composition. The silica gel composition comprises a silica gel body consisting of components A and B in a mass ratio of 1 to 5, wherein the component A comprises, by mass, 34-83% of dimethyl polysiloxane, 12-65% of polymethylhydrosiloxane and 1-5% of catalysts; the component B is prepared from, by mass, 34-83% of dimethyl polysiloxane, 12-65% of polymethylhydrosiloxane and 1-5% of cross-linking agent; the silica gel composition further contains, based on the total mass of the silica gel body, 0.4-1% of fumed silica, 3.3-4% of prefoamed polymer microspheres and 20-30% of phase change paraffin or 40-50% of solid-state phase change microcapsules; wherein, the prefoamed polymer microspheres are prefoamed polystyrene microspheres, and shells of the prefoamed polystyrene microspheres are made of polystyrene. The silica gel composition is low in specific gravity and weight, has high thixotropy and a good phase change function and is particularly suitable for preparing silica gel prosthesis products. The invention further provides a preparation method of the silica gel composition. According to the preparation method, steps are few, the process is short, operation is easy and convenient, and preparation cost is low.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a silicone composition for making a silicone prosthesis and a preparation method thereof. Background technique [0002] Silicone prosthesis is the abbreviation of silicone gel prosthesis, which is formed by heating and molding after filling silicone gel in a film bag. At present, silicone prosthesis has been widely used in medicine, plastic surgery and other fields, and breast silicone prosthesis is the most widely used. Silicone breast prosthesis is also called prosthetic breast, artificial breast and false breast. It is a substitute for breast cancer patients after resection (a type of prosthesis, which is different from adult products, and is a surgical rehabilitation product). The commonly used material for prosthetic breasts is medical silicone. Medical silicone has good biocompatibility, non-irritating, non-toxic, non-allergic to human tissue, and very little re...

AI Technical Summary

Problems solved by technology

[0003] However, at present, silicone materials basically only have a single function. Silicone prosthesis products are made of one or more layers of ordinary silicone gel covered with TPU film, and the contact surface with the human body surface is fixed according to the design shape, without variability

However, the body shape of each user is different, or special consumer groups (surgical trauma users) need more silicone materials that can fully repair body defects. The existing silicone prostheses made of silicone materials cannot meet the requirements due to their low thixotropy. Needs to be used in various forms

Moreover, the proportion of silicone gel used in ordinary silicone prosthesis is about 0.98G / CM3, which is much larger than that of human fat tissue, so that the user feels a heavy load

On the other hand, the existing silica gel materials have poor heat storage capacity, and the temperature will cool down quickly after being placed, and the phase change effect is poor.

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