Method for preparing intelligent stress responding type silicon-boron polymer microgel

Abstract

The invention discloses a method for preparing intelligent stress responding type silicon-boron polymer microgel, comprising the following steps of: stirring a prepolymerization reaction solution at 70-130 DEG C to react for 1-6h, continuously stirring after adding a bifunctional chain extender to react at 30-90 DEG C for 2-6h, and finally stirring after adding a functional modifier to react at 30-120 DEG C for 4-8h, to obtain the intelligent stress responding type silicon-boron polymer microgel. The prepolymerization reaction solution comprises: 75.0-96.5 wt. % low molecular weight polydiorganosiloxane, and 3.50-25.0 wt. % of boron-containing compound. The method for preparing the intelligent stress responding type silicon-boron polymer microgel has advantages of low reaction temperature and easy operation, has no need to introduce a catalyst, and is in favor of large scale production.

Description

Technical field [0001] The invention relates to the field of polymer synthesis, and more specifically, to an intelligent stress-responsive silicon-boron polymer microgel that can be impregnated or coated on flexible sheets and impact-resistant protective textiles and a preparation method. Background technique [0002] Impact protection materials are a kind of special functional materials with wide application prospects. Because of their good energy absorption characteristics, they are widely used in sports protection, product packaging, and military and police protective clothing. An ideal impact resistant protective fabric should have obvious stress response. It should be soft and comfortable when it is not impacted by external forces. When it is impacted by an external force, the material gives the fabric temporary rigidity and absorbs a large amount of energy during the impact, playing an excellent protective function. [0003] Boron-crosslinked siloxane has special dilatant p...

AI Technical Summary

Problems solved by technology

1. Under the condition of no external catalyst, the synthesis temperature of silicon-boron cross-linked polymer is too high, such as 150-250°C

2. Although the addition of the catalyst can reduce the reaction temperature to a certain extent, it increases the cost and has an adverse effect on the safety performance of the product

3. In the reaction system disclosed in the above patent, since the chain extension and crosslinking reactions of the silicon boron polymer occur simultaneously in the system, the high viscosity of the product brings great inconvenience to large-scale production and subsequent processes.

4. Although the dilatant siloxane emulsion disclosed in the patent CN 102037088A has certain technical advantages, it uses a large amount of surfactants and the operation is complicated