A kind of self-healing polyurethane based on boroxane and preparation method thereof

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: 2022-06-21
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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  • A kind of self-healing polyurethane based on boroxane and preparation method thereof
  • A kind of self-healing polyurethane based on boroxane and preparation method thereof
  • A kind of self-healing polyurethane based on boroxane and preparation method thereof

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 the synthetic route is such as figure 1 shown,

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

[0042] Weigh 3 mmol of 3-aminophenylboronic acid as the solute, take toluene as the solvent, the concentration of 3-aminophenylboronic acid is 0.01644g / ml during mixing, react at 80 ° C for 12 h, after the reaction is completed, suction filtration, and vacuum drying at 60 ° C to obtain Boroxane-containing crosslinking agent NH 2 -Boroxine.

[0043] Preparation of isocyanate-based polyurethane prepolymer:

[0044] Add 20 mmol of isophorone diisocyanate, 10 mmol of polypropylene glycol (PPG2000), and 1.3 mmol of small molecule chain extender 1,4-butanediol into a three-necked flask equipped with a stirrer and a glass stopper, mix well, Under a nitrogen atmosphere, it is heated with a collector-type constant temperature heating magnetic stirrer (oil bath), and...

Embodiment 2

[0050] A preparation method of a self-healing polyurethane of boroxane, comprising the following steps:

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

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

[0053] Preparation of Isocyanate-Based Polyurethane Prepolymers

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

[0055] Step 2: Based on NH 2 - Preparation of s...

Embodiment 3

[0060] A preparation method of a self-healing polyurethane of boroxane, comprising the following steps:

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

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

[0063] Preparation of isocyanate-based polyurethane prepolymer:

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

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

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Abstract

The invention discloses a boroxane-based self-healing polyurethane and a preparation method thereof, belonging to the technical field of material science. Firstly, the polyurethane prepolymer with terminal isocyanate group was prepared, and then reacted with Boroxine with different terminal groups under different conditions to prepare self-healing polyurethane based on boroxane. Boroxine, which has a tripod structure and dynamic reversible properties, is introduced into the polyurethane chain as a crosslinking agent to increase the crosslinking density of polyurethane and obtain self-healing polyurethane with better mechanical properties. Combining the advantages of the designability of polyurethane and the controllability of soft and hard segments, the preparation route of the present invention is simple, which reduces the complexity of system design and processing, and is expected to solve the problem of high mechanical strength and good repair performance of polyurethane materials. The contradiction between provides an effective way.

Description

technical field [0001] The invention belongs to the technical field of material science, and relates to a self-healing polyurethane based on boroxane and a preparation method thereof. Background technique [0002] Polyurethane materials are widely used in aerospace, transportation, building materials and construction and many other fields due to their wide variety of raw materials, diverse formulations, strong designability, and many excellent physical and chemical properties. However, in the process of processing, forming and using polyurethane materials, due to the influence of thermal, mechanical and chemical factors, micro-cracks of different degrees will appear inside the material, and these micro-cracks are likely to expand into macro-cracks, resulting in a decrease 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. ...

Claims

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Application Information

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Patent Type & Authority Patents(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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