Self-repairing waterborne polyurethane film and preparation method thereof

A water-based polyurethane and self-repairing technology, which is applied in the field of self-repairing material preparation, can solve problems such as product value damage, mechanical property damage, accidental impact or scratches, etc., and achieve recovery of mechanical properties, good mechanical properties, and low VOC. Effect

Inactive Publication Date: 2021-05-14
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of storage, transportation, sales, etc., polymer materials will inevitably encounter unexpected impacts or scratches. After the polymer materials are damaged, their original mechanical properties will be destroyed, resulting in damage to the product value.

Method used

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  • Self-repairing waterborne polyurethane film and preparation method thereof
  • Self-repairing waterborne polyurethane film and preparation method thereof
  • Self-repairing waterborne polyurethane film and preparation method thereof

Examples

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preparation example Construction

[0020] A preparation method for self-repairing water-based polyurethane film, comprising the following steps:

[0021] 1) Dissolve 3g of polytetrahydrofuran diol in 20mL of acetone after pumping water at 130°C, add 2g of isophorone diisocyanate and catalyst, and react at 70°C to 80°C for 2 hours to form a polyurethane prepolymer;

[0022] 2) After adding 5mL of N-methylpyrrolidone and 0.275g of 2,2-dimethylolpropionic acid to react for 2 hours, add 0.3-0.9g of 2-hydroxyethyl disulfide, cool to room temperature after two hours of reaction, and add 0.202g After reacting with triethylamine for 2-3 minutes, add 15 mL of water dropwise while stirring at a high speed to obtain a self-healing water-based polyurethane emulsion;

[0023] 3) Pouring the self-healing water-based polyurethane emulsion on the PTFE board and drying it at 40°C for two hours, then adding an appropriate amount of self-healing water-based polyurethane emulsion as needed, generally 4-5ml, and raising the tempera...

Embodiment 1

[0028] A preparation method for self-repairing water-based polyurethane film, comprising the following steps:

[0029] 1) Dissolve 3g of polytetrahydrofuran diol in 20mL of acetone after pumping water at 130°C, add 2g of isophorone diisocyanate and catalyst, and react at 70°C to 80°C for 2 hours to form a polyurethane prepolymer;

[0030] 2) After adding 5mL of N-methylpyrrolidone and 0.275g of 2,2-dimethylolpropionic acid to react for 2 hours, add 0.3g of 2-hydroxyethyl disulfide, react for two hours and cool down to room temperature, add 0.202g of triethyl After amine reaction for 2-3 minutes, add 15mL of water dropwise while stirring at a high speed to obtain a self-healing water-based polyurethane emulsion;

[0031] 3) Pouring self-healing water-based polyurethane emulsion on the PTFE board and drying at 40°C for two hours, then adding an appropriate amount of self-healing water-based polyurethane emulsion, after two hours, raising the temperature to 70°C and drying for 24...

Embodiment 2

[0033] A preparation method for self-repairing water-based polyurethane film, comprising the following steps:

[0034] 1) Dissolve 3g of polytetrahydrofuran diol in 20mL of acetone after pumping water at 130°C, add 2g of isophorone diisocyanate and catalyst, and react at 70°C to 80°C for 2 hours to form a polyurethane prepolymer;

[0035] 2) After adding 5mL of N-methylpyrrolidone and 0.275g of 2,2-dimethylol propionic acid to react for 2 hours, add 0.45g of 2-hydroxyethyl disulfide, react for two hours and cool down to room temperature, add 0.202g of triethyl After amine reaction for 2-3 minutes, add 15mL of water dropwise while stirring at a high speed to obtain a self-healing water-based polyurethane emulsion;

[0036] 3) Pouring self-healing water-based polyurethane emulsion on the PTFE board and drying at 40°C for two hours, then adding an appropriate amount of self-healing water-based polyurethane emulsion, after two hours, raising the temperature to 70°C and drying for ...

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Abstract

The invention belongs to the technical field of preparation of self-repairing materials, and provides a preparation method of a self-repairing waterborne polyurethane film, wherein the preparation method comprises the following steps: 1) dissolving polytetrahydrofuran glycol in acetone, adding isophorone diisocyanate and a catalyst, and reacting to generate a polyurethane prepolymer; (2) sequentially adding N-methyl pyrrolidone, 2,2-dimethylolpropionic acid, 2-hydroxyethyl disulfide and triethylamine into the polyurethane prepolymer, and carrying out stirring reaction, so as to obtain a self-repairing waterborne polyurethane emulsion; and 3) pouring the self-repairing waterborne polyurethane emulsion on a polyfluortetraethylene plate, and drying to obtain the self-repairing waterborne polyurethane film. The reversible disulfide bond is introduced, based on the instability of the disulfide bond, a covalent bond of the disulfide bond is easy to break and recombine with other sulfur atoms, and self-repairing can be realized by utilizing an oxidation-reduction reaction between the disulfide bond and sulfydryl, so that the prepared waterborne polyurethane film has good self-repairing performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of self-repairing materials, and in particular relates to a self-repairing water-based polyurethane film and a preparation method thereof. Background technique [0002] In the process of storage, transportation, and sales, polymer materials will inevitably encounter unexpected impacts or scratches. After the polymer material is damaged, its original mechanical properties will be destroyed, resulting in damage to the product value. Self-healing materials refer to a new class of intelligent polymer materials that can self-diagnose and self-repair when the material is damaged. The purpose of preparing self-healing polymer materials is to enable the material to automatically repair the mechanical properties of the material after damage, eliminating The potential safety hazards in the use of materials can be avoided, and the service life of materials can be extended, so as to obtain polymer materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/66C08G18/48C08G18/34C08G18/32C08L75/08C08J5/18
CPCC08G18/10C08G18/6692C08G18/4854C08J5/18C08J2375/08C08G18/348C08G18/3855
Inventor 易昌凤张宏量杨晓昕黄漂
Owner HUBEI UNIV
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