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Self-repaired waterborne polyurethane material and preparation method thereof

A water-based polyurethane, self-healing technology, applied in the field of materials, to achieve the effects of good self-healing performance, simple operation and good mechanical properties

Inactive Publication Date: 2019-07-19
芜湖万隆新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But so far, the self-healing research by introducing furan groups into the main chain and / or end groups of waterborne polyurethanes using DA reaction has not been reported.

Method used

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  • Self-repaired waterborne polyurethane material and preparation method thereof
  • Self-repaired waterborne polyurethane material and preparation method thereof
  • Self-repaired waterborne polyurethane material and preparation method thereof

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preparation example Construction

[0032] The invention provides a kind of preparation method of self-repairing waterborne polyurethane, comprising:

[0033] A) heating and dehydrating the macromolecular diol and reacting with diisocyanate under stirring to obtain the first prepolymer;

[0034] B) reacting the first prepolymer with an organic solvent, a small molecule diol chain extender containing a furan ring, a hydrophilic chain extender, an end-capping agent and a catalyst to obtain a second prepolymer;

[0035] C) neutralizing the second prepolymer with a neutralizing agent, then reacting with a diamine chain extender in deionized water, after high-speed dispersion and emulsification, removing the solvent in a vacuum to obtain an aqueous polyurethane emulsion;

[0036] D) mixing the water-based polyurethane emulsion with the maleimide cross-linking agent, and heating and reacting to obtain the self-healing water-based polyurethane.

[0037] The preparation method of the self-healing water-based polyuretha...

Embodiment 1

[0066] (1) Add 40.00g of polyethylene glycol 4000 into the reactor, heat to 100°C, use an oil pump to remove water for 4h, cool down to 70°C, add 15.01g of isophorone diisocyanate into the reactor, stir, React for 40 minutes under the protection of nitrogen, lower the temperature to 50°C, dissolve 1.84g of 2,5-furandimethanol, 3.06g of dimethylolbutyric acid and 0.015g of dibutyltin laurate in 60g of acetone and add it dropwise to the reactor. After the solution was completed, the reaction was continued for 6 hours, the temperature was lowered to 40° C., and 2.511 g of triethylamine was added for neutralization for 2 hours.

[0067] Dissolve 1.35g of ethylenediamine in 300ml of deionized water. After the reaction system is cooled to room temperature, slowly drop it into the deionized water in which ethylenediamine is dissolved, and at the same time stir and disperse at a high speed (stirring speed 8000rpm). Continue to Stir for 1 h, filter with gauze, and then use a rotary eva...

Embodiment 2

[0070] (1) Add 40.00g of polyethylene glycol 4000 into the reactor, heat to 100°C, use an oil pump to remove water for 4h, cool down to 70°C, add 15.01g of isophorone diisocyanate into the reactor, stir, Under the protection of nitrogen, react for 40min, lower the temperature to 50°C, dissolve 2.24g of 2,5-furandimethanol, 2.59g of dimethylolbutyric acid and 0.015g of dibutyltin laurate in 60g of acetone and add it dropwise to the reactor. After the solution was completed, the reaction was continued for 7 hours, the temperature was lowered to 35° C., and 1.77 g of triethylamine was added for neutralization for 1 hour.

[0071] Dissolve 0.66g of ethylenediamine in 300ml of deionized water. After the system is cooled to room temperature, slowly drop it into the deionized water in which ethylenediamine is dissolved, and at the same time stir and disperse at a high speed (stirring speed 8000rpm). Continue to Stir for 1 h, filter with gauze, and then use a rotary evaporator to remo...

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Abstract

The invention provides a preparation method of self-repaired waterborne polyurethane. The preparation method comprises the following steps: after thermal dehydration of macromolecular dihydric alcohol, stirring with diisocyanate for a reaction to obtain a first prepolymer; reacting the first prepolymer with an organic solvent, a micromolecular glycol chain extender containing furan rings, a hydrophilic chain extender, an end-capping reagent and a catalyst to obtain a second prepolymer; neutralizing the second prepolymer with a neutralizer, then reacting with a diamine chain extender in deionized water, and after high-speed dispersed emulsification, carrying out vaccum solvent removal to obtain a waterborne polyurethane emulsion; mixing the waterborne polyurethane emulsion with a maleinimide cross-linking agent, and carrying out a heating reaction to obtain the self-repaired waterborne polyurethane. The self-repaired waterborne polyurethane prepared in the invention can show good mechanical properties and self-repair performance under specific structure conditions, is high in emulsion stability, green and environmentally-friendly, can realize self-repairing under a heating condition, does not need a catalyst, and is mild in condition, simple in operation and good in repair effect.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a self-repairing water-based polyurethane material and a preparation method thereof. Background technique [0002] Water-based polyurethane is a new type of polyurethane system that uses water instead of organic solvents as the dispersion medium. It not only has some important characteristics of solvent-based polyurethane materials, but also has the advantages of non-toxic, non-flammable, non-polluting, resource-saving, easy to store, and convenient to use. It is gradually It replaces the traditional solvent-based polyurethane, develops rapidly, and attracts people's attention. However, in actual use, polymer materials will inevitably produce local damage and microcracks, which will cause macroscopic cracks and breakage, affecting the normal use of materials and shortening their service life. Therefore, it is a realistic and important problem to achieve early repair of cracks ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/34C08L75/08C08K5/3415
CPCC08G18/3218C08G18/3228C08G18/348C08G18/4833C08G18/6674C08G18/6685C08G18/6692C08K5/3415C08L75/08
Inventor 周光远姜敏梁全铎张强
Owner 芜湖万隆新材料有限公司
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