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Self-repaired waterborne polyurethane/cellulose nanocrystalline composite material and preparation method thereof

A technology of water-based polyurethane and composite materials, applied in the field of materials, can solve the problems of non-self-repairing functionality, unfavorable uniform dispersion of cellulose nanocrystals, etc., and achieve the effect of improving mechanical properties and self-repairing properties

Pending 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

However, the above composite materials only realize the composite of polyurethane and cellulose nanocrystals without self-healing functionality, and the composite method requires organic solvents or high temperatures, which is not conducive to environmental protection and uniform dispersion of cellulose nanocrystals.

Method used

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  • Self-repaired waterborne polyurethane/cellulose nanocrystalline composite material and preparation method thereof
  • Self-repaired waterborne polyurethane/cellulose nanocrystalline composite material and preparation method thereof
  • Self-repaired waterborne polyurethane/cellulose nanocrystalline composite material and preparation method thereof

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preparation example Construction

[0038] The present invention provides a kind of preparation method of self-healing waterborne polyurethane / cellulose nano crystal composite material, comprising:

[0039] A) prepare aqueous polyurethane emulsion;

[0040] a) heating and dehydrating the macromolecular diol and reacting with diisocyanate under stirring to obtain the first prepolymer;

[0041]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;

[0042] c) neutralizing the second prepolymer with a neutralizing agent, reacting with a diamine chain extender in deionized water, dispersing and emulsifying, removing the solvent to obtain an aqueous polyurethane emulsion;

[0043] B) mixing the cellulose nanocrystal powder or aqueous dispersion with the carboxylic acid containing maleimide groups, heating and reacting, and obtaining the maleimide grafted ce...

Embodiment 1

[0081] (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 14.58g of isophorone diisocyanate into the reactor, stir, React for 40 minutes under the protection of nitrogen, lower the temperature to 50°C, dissolve 3.07g of furan dimethanol, 3.07g of dimethylol butyric acid and 0.015g of dibutyltin laurate in 60g of acetone and add it dropwise to the reactor. The reaction was continued for 7h, the temperature was lowered to 35°C, and 2.52g of triethylamine was added for neutralization for 1h.

[0082] 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 remove the acetone in the emulsion to obtain a p...

Embodiment 2

[0086] (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 14.58g of isophorone diisocyanate into the reactor, stir, React for 40 minutes under the protection of nitrogen, lower the temperature to 50°C, dissolve 3.07g of furan dimethanol, 3.07g of dimethylol butyric acid and 0.015g of dibutyltin laurate in 60g of acetone and add it dropwise to the reactor. The reaction was continued for 7h, the temperature was lowered to 35°C, and 2.52g of triethylamine was added for neutralization for 1h.

[0087] 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 1h, filter with gauze, and remove the acetone in the emulsion with a rotary evaporator to obtain a polyureth...

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Abstract

The invention provides a preparation method of a self-repaired waterborne polyurethane / cellulose nanocrystalline composite material. The preparation method comprises the following steps: preparing a waterborne polyurethane emulsion; mixing cellulose nanocrystalline powder or an aqueous dispersion with carboxylic acid containing maleinimide radicals in deionized water, carrying out vacuum-pumping water removal during a heating reaction to obtain maleinimide grafted cellulose nanocrystallines; mixing the waterborne polyurethane emulsion with the maleinimide grafted cellulose nanocrystallines, carrying out ultrasonic dispersion uniformly, and heating to obtain the self-repaired waterborne polyurethane / cellulose nanocrystalline composite material. Furan rings are introduced into a waterborne polyurethane macromolecular chain structure through a furan ring chain extender and / or an end-capping reagent, the maleinimide radicals are grafted to the surfaces of the cellulose nanocrystallines through an esterification reaction, the two components are uniformly mixed and heated to obtain the novel self-repaired waterborne polyurethane / cellulose nanocrystalline composite material, so that direct and uniform fastening recombination of the waterborne polyurethane and cellulose nanocrystallines is facilitated, and mechanical properties and self-repair performance of the material are improved.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a self-repairing waterborne polyurethane / cellulose nanocrystal composite material and a preparation method thereof. Background technique [0002] Water-based polyurethane has good physical properties, non-toxic, non-flammable, non-polluting, resource-saving, easy to store, and convenient to use. It has attracted widespread attention and has a wide range of applications. However, waterborne polyurethane, like most polymer materials, will inevitably produce local damage and microcracks in actual use, and thus cause macroscopic cracks and breakage, affecting the normal use of the material and shortening the service life. In addition, compared with solvent-based polyurethane, waterborne polyurethane has poor solvent resistance and mechanical properties. Therefore, it is a realistic and important issue to realize self-healing of waterborne polyurethane and improve its mechanical pro...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08L1/04C08G18/75C08G18/66C08G18/48C08G18/34C08G18/32
CPCC08G18/3218C08G18/4833C08G18/6674C08G18/6685C08G18/6692C08G18/755C08L75/08C08L1/04
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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