Self-repairing polyurethane based on boroxine and preparation method of self-repairing polyurethane

A self-healing, polyurethane technology, applied in the field of material science, can solve problems such as complex synthesis routes and processing methods

Active Publication Date: 2021-10-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the complex synthesis route and processing method of self-repairing polyurethane in the above-mentioned prior art, and provide a self-repairing polyurethane of boron hexane and its preparation method

Method used

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  • Self-repairing polyurethane based on boroxine and preparation method of self-repairing polyurethane
  • Self-repairing polyurethane based on boroxine and preparation method of self-repairing polyurethane
  • Self-repairing polyurethane based on boroxine and preparation method of self-repairing polyurethane

Examples

Experimental program
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Effect test

Embodiment 1

[0040] A kind of preparation method of the self-healing type polyurethane of boroxane, comprises the following steps, and synthetic route is as follows figure 1 as shown,

[0041] Step 1: NH 2 - Preparation of Boroxine

[0042] Weigh 3mmol of 3-aminophenylboronic acid as the solute, use toluene as the solvent, and mix the concentration of 3-aminophenylboronic acid at 0.01644g / ml, react at 80°C for 12h, suction filter after the reaction, and dry under vacuum at 60°C to obtain Boroxane-containing crosslinker NH 2 - Boroxine.

[0043] Preparation of isocyanate-based polyurethane prepolymer:

[0044] Add 20mmol of isophorone diisocyanate, 10mmol of polypropylene glycol (PPG2000), and 1.3mmol of small molecule chain extender 1,4-butanediol into a three-necked flask equipped with a stirrer and a glass bottle stopper, mix well, Under a nitrogen atmosphere, use a collector-type constant temperature heating magnetic stirrer to heat (oil bath), heat up to 70° C., and react for 4 ho...

Embodiment 2

[0050] A kind of preparation method of the self-healing type polyurethane of oxane, comprises the steps:

[0051] Step 1: NH 2 - Preparation of Boroxine

[0052] Weigh 6mmol of 3-aminophenylboronic acid as the solute, use toluene as the solvent, and mix the concentration of 3-aminophenylboronic acid at 0.01600g / ml, react at 85°C for 13h, suction filter after the reaction, and vacuum dry at 60°C to obtain The product NH containing boroxane 2 - Boroxine.

[0053] Preparation of isocyanate-based polyurethane prepolymer

[0054] Add 20mmol of isophorone diisocyanate, 10mmol of polypropylene glycol (PPG2000), and 1.4mmol of small molecule chain extender 1,4-butanediol into a three-necked flask equipped with a stirrer and a glass bottle stopper, and mix well. Under a nitrogen atmosphere, use a collector-type constant temperature heating magnetic stirrer to heat (oil bath), raise the temperature to 70° C. and react for 4 hours to obtain PPU.

[0055] Step 2: Based on NH 2 -Prepar...

Embodiment 3

[0060] A kind of preparation method of the self-healing type polyurethane of oxane, comprises the steps:

[0061] Step 1: NH 2 - Preparation of Boroxine

[0062] Weigh 9 mmol of 3-aminophenylboronic acid as the solute, use toluene as the solvent, and mix the concentration of 3-aminophenylboronic acid at 0.01820g / ml, react at 80°C for 13h, suction filter after the reaction, and dry under vacuum at 60°C to obtain The product NH containing boroxane 2 - Boroxine.

[0063] Preparation of isocyanate-based polyurethane prepolymer:

[0064] Add 30mmol of isophorone diisocyanate, 10mmol of polypropylene glycol (PPG2000), and 1.5mmol of small molecule chain extender 1,4-butanediol into a three-necked flask equipped with a stirrer and a glass bottle stopper, mix well, Under a nitrogen atmosphere, use a collector-type constant temperature heating magnetic stirrer to heat (oil bath), raise the temperature to 70° C. and react for 4 hours to obtain PPU.

[0065] Step 2: Based on NH 2 -...

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Abstract

The invention discloses self-repairing polyurethane based on boroxine and a preparation method of the self-repairing polyurethane, belonging to the technical field of material science. The preparation method comprises the following steps: firstly, preparing an isocyanate-terminated polyurethane prepolymer, and then subjecting the isocyanate-terminated polyurethane prepolymer to reacting with boroxine having different terminal groups under different conditions to prepare the self-repairing polyurethane based on the boroxine. According to the invention, the boroxine with a three-foot structure and dynamic reversible performance is introduced into a polyurethane chain as a cross-linking agent, so the cross-linking density of polyurethane is improved, and the self-repairing polyurethane with more excellent mechanical performance is prepared; and through combination with the advantages of designability of polyurethane and adjustability of soft and hard segments of polyurethane, the preparation route of the method is simple, the complexity of the system in design and processing is reduced, and an effective way is expected to be provided for solving contradiction between high mechanical strength and good repairing performance of a polyurethane material.

Description

technical field [0001] The invention belongs to the technical field of material science, and relates to a self-repairing polyurethane based on boroxane and a preparation method thereof. Background technique [0002] Polyurethane materials are widely used in many fields such as aerospace, transportation, building materials and construction due to a wide variety of raw materials, diverse formulations, strong designability, and many excellent physical and chemical properties. However, during the processing and use of polyurethane materials, due to the influence of thermal, mechanical and chemical factors, micro-cracks will appear in different degrees inside the material, and these micro-cracks are likely to expand into macro-cracks, resulting in a decline in the mechanical properties of the material and Reduced service life. Research on high-performance self-healing polyurethane is of great significance to meet the requirements of sustainable development. However, to achieve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/12C08J5/18C08L75/08
CPCC08G18/6685C08G18/48C08G18/3206C08G18/12C08J5/18C08J2375/08C08G18/3897
Inventor 任龙芳林聪聪余思杰
Owner SHAANXI UNIV OF SCI & TECH
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