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Self-repairing aqueous polyurethane prepolymer, and dispersion liquid and application thereof

A water-based polyurethane and prepolymer technology, which is applied in medical science, prosthesis, tissue regeneration, etc., can solve problems that have not been seen, and achieve the effect of restoring the mechanical properties of materials and the appearance of materials

Inactive Publication Date: 2017-05-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, it has not been seen that small molecules containing DA bonds are used as modified chain extenders, and are directly introduced into the molecular chains of waterborne polyurethanes during polymerization to prepare intrinsic self-healing waterborne polyurethanes.

Method used

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  • Self-repairing aqueous polyurethane prepolymer, and dispersion liquid and application thereof
  • Self-repairing aqueous polyurethane prepolymer, and dispersion liquid and application thereof
  • Self-repairing aqueous polyurethane prepolymer, and dispersion liquid and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Melt 62.5g of MDI100 and add it to 200g of PPG2000. After mixing evenly, add 0.25g of dibutyltin dilaurate as a catalyst, raise the temperature to 75°C, and stir the reaction for 1.5h under the protection of nitrogen. Determination of R value by amine titration;

[0029] (2), add 18.4g of hydrophilic chain extender DMAP to the product of step (1), under the protection of inert gas, after reacting at 80°C for 0.5-2h, add 9g of the diol containing Diels-Alder bond to extend the chain Agent DA1, continue to react at 80°C for 2 hours, cool down to 30-50°C, add triethylamine, react for 40 minutes to neutralize to pH=8-9, and obtain self-repairing waterborne polyurethane prepolymer;

[0030] (3), after dissolving the water-based polyurethane prepolymer prepared in step (2) with 30ml of acetone, slowly add 540g of deionized water at a temperature of 20 to 40°C and an emulsifier rotating speed of 4000 rpm. After dispersing and dispersing, extract and remove the organic sol...

Embodiment 2

[0032] (1) Melt 109g of TDI and add it to 200g of PPG2000. After mixing evenly, add 0.22g of dibutyltin dilaurate as a catalyst, raise the temperature to 85°C, and stir the reaction for 1h under the protection of nitrogen. Titrate with acetone-di-n-butylamine Determination of R value by method;

[0033] (2), add 16g of hydrophilic chain extender DMAP to the product of step (1), under the protection of inert gas, after reacting at 75°C for 2h, add 16g of diol chain extender DA2 containing Diels-Alder bond, Continue to react at 80°C for 2-4 hours, cool down to 45°C, add ammonia water, react for 30 minutes to neutralize to pH=8-9, and obtain self-healing water-based polyurethane prepolymer;

[0034] (3) After diluting the water-based polyurethane prepolymer prepared in step (2) with 40ml of acetone, slowly add 820g of deionized water at a temperature of 35°C and an emulsifier speed of 3500 rpm for shear dispersion After that, the organic solvent is removed by extraction under re...

Embodiment 3

[0036] (1) After melting 109g of MDI, add it to 180g of PTMEG2000, mix it evenly, add 0.3g of stannous octoate as a catalyst, heat up to 85°C, under the protection of argon, stir and react for 1h, use acetone-di-n-butylamine titration method Determination of R value;

[0037](2), add 16g of hydrophilic chain extender DMAP to the product of step (1), under the protection of inert gas, after reacting for 2h at 75°C, add 23g of diol chain extender DA2 containing Diels-Alder bond, Continue to react at 80°C for 2.5h, cool down to 30°C, add triethylamine, react for 30min to neutralize to pH=8-9, and obtain self-healing waterborne polyurethane prepolymer;

[0038] (3) After dissolving the water-based polyurethane prepolymer prepared in step (2) with 60ml of methyl ethyl ketone, slowly add 600g of deionized water at a temperature of 45°C and an emulsifier speed of 4000 rpm for shear dispersion After dispersion, the organic solvent is removed by vacuum extraction to obtain the corresp...

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Abstract

The invention discloses a self-repairing aqueous polyurethane prepolymer, and a dispersion liquid and application thereof. A preparation method comprises the following steps: adding a prepolymer with good self-emulsifying properties into water, wherein the prepolymer is polymerized from diisocyanate, macromolecular polyol, a hydrophilic chain extender, and diatomic alcohol containing Diels-Alder dynamic bonds; and dispersing the mixture with high speed stirring by an emulsifier to obtain an aqueous polyurethane dispersion liquid with a solid content of 10-60%wt. The introduction of the diatomic alcohol containing the Diels-Alder dynamic bonds allows self-repairing of cracks and damages of the material by cracking and recombination of the Diels-Alder bonds during an application process, thus improving the service life and safety of the material.

Description

technical field [0001] The invention relates to a self-repairing waterborne polyurethane prepolymer, its dispersion liquid and its application, and belongs to the field of polymer materials. Background technique [0002] Water-based polyurethane is a new type of polyurethane system that uses water instead of organic solvents as the dispersion medium, also known as water-dispersed polyurethane, water-based polyurethane or water-based polyurethane. Water-based polyurethane uses water as a solvent, and has the advantages of no pollution, safety and reliability, excellent mechanical properties, good compatibility, and easy modification. The water-based polyurethane resin has gradually replaced the solvent-based and has become an important direction for the development of the polyurethane industry. Waterborne polyurethane can be widely used in coatings, adhesives, fabric coating and finishing agents, leather finishing agents, paper surface treatment agents and fiber surface trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/10C08G18/34C08G18/32A61L27/60A61L27/50A61L27/18C08J3/03
CPCC08G18/6692A61L27/18A61L27/507A61L27/60A61L2430/06A61L2430/22C08G18/10C08G18/4277C08G18/4825C08G18/4833C08G18/6655C08G18/6685C08J3/03C08J2375/04C08J2375/06C08J2375/08C08G18/348C08G18/3846C08G18/3228C08G18/3275C08L75/04C08L75/06C08L75/08
Inventor 夏和生杨莉卢锡立
Owner SICHUAN UNIV
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