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

A type of silicon-boron and polymer technology, which is applied in the field of intelligent stress-responsive silicon-boron polymer microgel and its preparation, can solve the inconvenience of large-scale production and subsequent procedures, high synthesis temperature of silicon-boron cross-linked polymer, and product safety. problems such as adverse effects on performance, to achieve the effect of being conducive to large-scale production, excellent energy absorption efficiency, and improving energy absorption efficiency

Inactive Publication Date: 2013-09-25
THE HONG KONG RES INST OF TEXTILES & APPAREL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] A preparation method of intelligent stress-responsive silicon-boron polymer microgel includes the following steps:

[0032] The pre-polymerization reaction solution is stirred and reacted at 70-130°C for 1-6 hours; the pre-polymerization reaction solution includes low molecular weight polydiorganosiloxane and a boron-containing compound, and the above two react to form a linear silico-boron polymer;

[0033] Then add the bifunctional chain extender and continue to stir and react for 2-6 hours, and the reaction temperature is 30-90℃; at this time, after adding the bifunctional chain extender, the chain extension reaction occurs in the reaction solution to make the linear silico-boron polymer molecules Chain diffusion is extended;

[0034] Finally, add functional modifier and stir for 4-8 hours under the condition of 30-120℃. After adding functional modifier here, cross-linking reaction occurs in the reaction liquid, and the linear silico-boron polymer entangled by chain extensi...

Embodiment 1

[0052] Polydimethylsiloxane with a molecular weight of 4000 and a viscosity of 1600mpa.s at 25°C, which accounts for 75wt% of the weight of the prepolymerization reaction solution, and cyclohexylethylene borate, which accounts for 25wt% of the weight of the prepolymerization reaction solution Mix into a pre-polymerization reaction solution, stir and react for 4 hours at 110°C, then add 5% of the mass of the pre-polymerization reaction solution, a bifunctional chain extender, hexamethyl diisocyanate, and continue to stir and react for 2 hours. Reaction temperature At 40°C, the functional modifier tetraisobutyl titanate equivalent to 3% of the mass of the prepolymerization reaction solution is added at the end, and the reaction is stirred at 70°C for 8 hours to obtain the intelligent stress-responsive silicon-boron polymerization Substance microgel (the stirring speed in the experiment is 300rpm); 25℃, 170S -1 The viscosity of the silicon-boron polymer microgel dispersion obtained...

Embodiment 2

[0054] Mixing polydimethylsiloxane with a molecular weight of 2000 and a viscosity of 1200mpa.s at 25°C, which accounts for 85wt% of the weight of the prepolymerization reaction solution, and trimethoxyboroxane, which accounts for 15wt% of the weight of the prepolymerization reaction solution The pre-polymerization reaction solution was stirred and reacted at 90°C for 4 hours, and then 2.5% of the mass of the pre-polymerization reaction solution was added to the bifunctional chain extender toluene diisocyanate for 4 hours. The reaction temperature was 70°C. Finally, add the functional modifier tetraisopropyl titanate equivalent to 4.5% of the mass of the prepolymerization reaction solution and stir for 8 hours at 90°C to obtain the intelligent stress-responsive silicon-boron polymer microgel (The stirring speed in the experiment is 500rpm); 25℃, 170S -1 The viscosity of the silicon-boron polymer microgel dispersion obtained below is 135mpa.s; the particle size test of the microg...

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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...

Claims

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Application Information

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IPC IPC(8): C08G79/08C08J3/24D06M15/687C08J9/42C08L75/04C08L1/02D06M101/34D06M101/32D06M101/36D06M101/06D06M101/12D06M101/26
CPCC08G77/56C08L83/14
Inventor 忻浩忠徐昆胡红
Owner THE HONG KONG RES INST OF TEXTILES & APPAREL
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