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Borate-based self-repairing polyurethane based on internal coordination and preparation method thereof

A technology of boric acid ester and polyurethane, which is applied in the field of polyurethane polymers, can solve problems such as poor hydrolysis stability, and achieve the effects of low cost, simple operation method, and easy large-scale production

Pending Publication Date: 2022-05-13
李玲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional borate compounds have poor hydrolytic stability, so they are rarely used in the field of polyurethane

Method used

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  • Borate-based self-repairing polyurethane based on internal coordination and preparation method thereof
  • Borate-based self-repairing polyurethane based on internal coordination and preparation method thereof
  • Borate-based self-repairing polyurethane based on internal coordination and preparation method thereof

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preparation example Construction

[0036] The present invention proposes a kind of preparation method based on the self-healing polyurethane of borate bond, it comprises:

[0037] 1) Mixing functional group-containing phenylboronic acid A, functional group-containing collar diol monomer B with an organic solvent, and generating a borate-based small-molecule chain extender C based on nitrogen-boron coordination through condensation reaction;

[0038] The dosage ratio of A, B and the organic solvent is 1 mol: 1 mol: 4-10L; the synthesis condition of the small molecule chain extender is: at a temperature of 25-60°C, the condensation reaction is 0.5-2h, preferably, the reaction time is 1h;

[0039] 2) adding polydiol D and diisocyanate E to the organic solvent and mixing respectively, and reacting to generate polyurethane prepolymer;

[0040] The amount ratio of polydiol D, diisocyanate E and organic solvent is 1mol: 1mol: 2.2-3.3L; the synthesis conditions of the prepolymer are: at a temperature of 60-80°C, react ...

Embodiment 1

[0069] The preparation method of the self-healing polyurethane based on the borate ester bond provided in this embodiment comprises:

[0070] 1) Dissolve 4-hydroxyphenylboron (1.24g, molecular weight 137.93, 0.009mol) and triethanolamine (1.34g, molecular weight 149.188, 0.009mol) in 50ml of DMF solution, react at 60°C for 1h, remove the solvent to obtain Small molecule chain extender C;

[0071] 2) Dissolve isophorone diisocyanate (8.4g, molecular weight 222.32, 0.038mol) and polyethylene glycol (9g, 0.038mol) in 100ml of DMF solution, and react at 75°C for 4h to generate polyurethane prepolymer solution;

[0072] 3) Add all the small molecule chain extender C dropwise to all the polyurethane prepolymer solutions, and continue to react for 1 hour after the dropwise addition to obtain the polyurethane primary polymer F;

[0073] 4) Add the crosslinking agent 2,4,6-triaminopyrimidine (0.99g, molecular weight 125.13, 0.008mol) in batches to the entire polyurethane primary poly...

Embodiment 2

[0075] The preparation method of the self-healing polyurethane based on the borate ester bond provided in this embodiment comprises:

[0076] 1) Dissolve 4-hydroxyphenylboron (0.74g, 0.0053mol) and triethanolamine (0.8g, 0.0053mol) in 50ml of DMF solution, react at 60°C for 1h, remove the solvent, and obtain small molecule chain extender C ;

[0077] 2) Dissolve isophorone diisocyanate (6.72g, 0.030mol) and polyethylene glycol (9g, 0.030mol) in 100ml of DMF solution, and react at 75°C for 4h to generate a polyurethane prepolymer solution;

[0078] 3) Add all the small molecule chain extender C dropwise to all the polyurethane prepolymer solutions, and continue to react for 1 hour after the dropwise addition to obtain the polyurethane primary polymer F;

[0079] 4) Add the crosslinking agent 2,4,6-triaminopyrimidine (0.59g, 0.0047mol) in batches to the entire polyurethane primary polymer F, react at 45°C for 2h, and then pour the obtained solution into the mold Dry to form a ...

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Abstract

The invention belongs to the technical field of polyurethane macromolecules, and relates to borate-based self-repairing polyurethane based on internal coordination and a preparation method thereof.The preparation method comprises the steps that 1, phenylboronic acid A and a lead diol monomer B are subjected to a condensation reaction to generate a micromolecule chain extender C; 2) generating a polyurethane prepolymer from the polyglycol D and the diisocyanate E; 3) reacting the micromolecule chain extender C with the polyurethane prepolymer to obtain a polyurethane primary polymer F; and 4) preparing a target product from the cross-linking agent G and the polyurethane primary polymer F. The water resistance and heat resistance of NCB bonds are improved by increasing N-to-B coordination, no catalyst needs to be added, and the prepared borate-based self-repairing polyurethane is excellent in mechanical property and has good self-repairing performance.

Description

technical field [0001] The invention belongs to the technical field of polyurethane polymers, and relates to a borate-based self-healing polyurethane based on internal coordination and a preparation method thereof. Background technique [0002] Invented in 1930, polyurethane is widely used in all aspects of life, such as decoration, automobiles, clothes, shoes, elastomers, coatings, walls, roof partitions, bridges and pipeline transportation, etc. It plays a very important role in modern social life role. In 2016, my country's annual output of polyurethane reached 22 million tons. The main raw materials for preparing polyurethane are diphenylmethane diisocyanate (MDI), toluene diisocyanate (TDI), polypropylene glycol (PPG) and chain extenders, all of which have become international commodities. However, the traditional irreversible cross-linking makes it difficult for polyurethane materials to self-heal after local damage, resulting in the damaged polyurethane materials be...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/10
CPCC08G18/4825C08G18/4833C08G18/10C08G18/6666C08G18/3897C08G18/3246
Inventor 李玲延晨政哲杨小龙
Owner 李玲
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