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Impact hardening material and preparation method thereof

A technology of catalyst and boron compound, which is applied in the field of impact hardening materials and its preparation, can solve the problems of poor formability and low material strength, and achieve the effects of improving elastic modulus and dimensional stability, excellent mechanical properties, and good flexibility

Active Publication Date: 2018-05-18
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the many properties of protective materials, the improvement of external force sensitivity and material energy absorption efficiency requires the material to have obvious viscous properties, which will make the material lower in strength and poor in formability

Method used

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  • Impact hardening material and preparation method thereof
  • Impact hardening material and preparation method thereof
  • Impact hardening material and preparation method thereof

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preparation example Construction

[0063] The invention provides a method for preparing an impact hardening material, comprising:

[0064] A) The main chain oligomer having the structure shown in formula (I), the chain extender and the boron-containing compound are mixed and reacted to obtain an initial reaction system;

[0065]

[0066] Among them, R 1 and R 2 independently selected from -H, hydroxyl, vinyl or amino;

[0067] R 3 selected from -H, alkyl, vinyl, ester or benzyl;

[0068] n is 40-2800;

[0069] B) mixing the initial reaction system, a branched oligomer having a structure represented by formula (II), a chemical crosslinking agent and a catalyst, and reacting to obtain an impact hardening material;

[0070]

[0071] Among them, R 4 selected from -H, hydroxyl or vinyl;

[0072] R 5 is an alkyl group;

[0073] R 6 selected from alkyl or benzyl;

[0074] n is 3-280;

[0075] The catalyst is selected from one of (1,5-cyclooctadiene) platinum dichloride, sodium tetrachloroaurate and b...

Embodiment 1

[0145] Mix 15 g of the main chain oligomer (n=170) having the structure shown in formula (2) and 0.75 g of toluene diisocyanate, and react for 4 hours at 150° C. and a stirring speed of 400 rad / s; then, add four 1.25g of hydroxydiborane was continued to react at 150°C for 4h to obtain the initial reaction system.

[0146] The initial reaction system was mixed with 5 g of branched oligomers (n=50) having a structure represented by formula (9), and reacted for 2 hours at 70° C. and a stirring speed of 400 rad / s; then, adding 3g of the chemical crosslinking agent (n=10) and 0.01g of (1,5-cyclooctadiene)platinum dichloride were reacted at 70°C for 12h to obtain an impact hardened material.

Embodiment 2

[0148] Mix 12 g of the main chain oligomer (n=2000) having a structure represented by formula (4) and 0.65 g of 4,4-dicyclohexylmethane diisocyanate, and mix them at 130°C and a stirring speed of 300 rad / s. React for 3 hours; then, add 1.35 g of p-hydroxyphenylboronic acid and continue to react for 3 hours at 130° C. to obtain an initial reaction system.

[0149] The initial reaction system was mixed with 5 g of branched oligomers (n=150) having the structure shown in formula (12), and reacted for 2 hours at 80° C. with a stirring speed of 300 rad / s; then, adding 3g of chemical crosslinking agent (n=25) and 0.02g of bicyclooctene rhodium chloride dimer were reacted at 80°C for 16h to obtain an impact hardening material.

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Abstract

The invention takes main chain oligomer with a structure shown by formula (I), a chain extender and a boron-containing compound for mixing and reacting to obtain a first heavy polymer system. The invention also takes a branch chain oligomer with a structure shown by formula (II); the branch chain oligomer reacts with a chemical cross-linking agent to obtain a branched and cross-linked structure, forming a second heavy network. According to the impact hardening material and the preparation method thereof disclosed by the invention, the first heavy polymer system provides a stress response characteristic; then the second heavy cross-linked network is introduced to give the material dimensional stability and relatively good mechanical property. A catalyst plays a role of enabling a group reaction between the branched polymer chain added in the second step of reaction and the cross-linking agent, so as to obtain a constant cross-linked structure. The interpenetrating structure can improvethe elasticity modulus and dimensional stability of the material. Therefore, the prepared impact hardening material has relatively high self-stability and mechanical strength as well as relatively good impact hardening performance.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to an impact hardening material and a preparation method thereof. Background technique [0002] Intelligent protective materials can be in a soft and light natural state in normal times, but when subjected to external forces, they will quickly harden and absorb a large amount of energy, thereby achieving efficient protection of external force receptors. Therefore, intelligent protective materials has always been the focus of attention. From inorganic rigid materials (such as cement, metal materials, etc.), to high-strength polymer fibers (such as ultra-high molecular weight polyethylene, Kevler fibers, etc.), porous foam materials and damping materials (such as polyurethane, cross-linked rubber, etc.), Intelligent protective materials have made great contributions to human beings in the field of protection. In 2005, the U.S. Army Laboratory launched the "liquid armor" ma...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08G18/61C08G18/75C08G18/76C08G18/83C08G77/44
CPCC08G18/61C08G18/755C08G18/758C08G18/7614C08G18/838C08G77/44C08J3/24C08J2383/10
Inventor 徐昆谭颖邓裕坤王丕新张文德裴小朋翟侃侃梁学称
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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