Self-repairing low-modulus high-strength waterborne polyurethane and preparation method thereof

A water-based polyurethane self-healing technology, applied in the field of water-based polyurethane, can solve problems affecting safety and service life

Inactive Publication Date: 2017-11-17
安徽思敬齐环保材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyurethane, especially its use, will inevitably be bumped

Method used

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  • Self-repairing low-modulus high-strength waterborne polyurethane and preparation method thereof
  • Self-repairing low-modulus high-strength waterborne polyurethane and preparation method thereof

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preparation example Construction

[0022] The present invention provides a kind of preparation method of self-healing low-modulus high-strength waterborne polyurethane, comprising the following steps:

[0023] a) React macromolecular diol I, macromolecular polyol II and diisocyanate at 90-100°C for 2-4 hours to obtain polyurethane prepolymer a 1 ; Macromolecular diol I is the polyester diol obtained by esterification of disulfide and adipate;

[0024] B) to the polyurethane prepolymer a that step a) obtains 1 Add small molecule chain extender, hydrophilic chain extender I, solvent, catalyst, and react at 60-80°C for 4-7 hours to obtain water-based polyurethane prepolymer a 2 ;

[0025] c) to the aqueous polyurethane prepolymer a that step b) obtains 2 Add solvent and hydrophilic chain extender II to the mixture, and react at 50-60°C for 0.5-1h to obtain water-based polyurethane prepolymer a 3 ;

[0026] d) to the water-based polyurethane prepolymer a obtained in step c) 3 Add solvent in the medium, add sa...

Embodiment 1

[0051] a) The macromolecular diol I with a relative molecular weight of 1000, polytetrahydrofuran diol and isophorone diisocyanate with a relative molecular weight of 2000 were reacted at 90° C. for 4 hours to obtain polyurethane prepolymer a 1 ; Macromolecular diol I is the polyester diol obtained by esterification of 2-hydroxyethyl disulfide and adipate;

[0052] B) to the polyurethane prepolymer a that step a) obtains 1 Add 1,2-propanediol, dimethylolpropionic acid, acetone, and stannous octoate to the mixture, and react at 60°C for 7 hours to obtain water-based polyurethane prepolymer a 2 ;

[0053] c) to the aqueous polyurethane prepolymer a that step b) obtains 2 Add acetone and sodium ethylenediamine sulfonate to the mixture, and react at 50°C for 1 hour to obtain the water-based polyurethane prepolymer a 3 ;

[0054] d) to the water-based polyurethane prepolymer a obtained in step c) 3 Add methyl ethyl ketone, add N, N dimethylethanolamine under high-speed shearin...

Embodiment 2

[0058] a) React macromolecular diol I with a relative molecular weight of 2000, polytetrahydrofuran diol with a relative molecular weight of 3000, and 4,4'-dicyclohexylmethane diisocyanate at 100°C for 2 hours to obtain polyurethane prepolymer a 1 ; Macromolecular diol I is the polyester diol obtained by esterification of 2-hydroxyethyl disulfide and adipate;

[0059] B) to the polyurethane prepolymer a that step a) obtains 1 Add 2-methyl-1,3-propanediol, dimethylolbutyric acid, butanone, n-butyltin dilaurate, and react at 80°C for 4 hours to obtain water-based polyurethane prepolymer a 2 ;

[0060] c) to the aqueous polyurethane prepolymer a that step b) obtains 2 Add acetone and sodium ethylenediamine sulfonate to the mixture, and react at 60°C for 0.5h to obtain the water-based polyurethane prepolymer a 3 ;

[0061] d) to the water-based polyurethane prepolymer a obtained in step c) 3 Add acetone, add sodium hydroxide under high-speed shearing, stir for 1 minute, add w...

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Abstract

The invention discloses self-repairing low-modulus high-strength waterborne polyurethane and a preparation method thereof. The preparation method comprises the following steps that macromolecular diol I, macromolecular polyol II and diisocyanate are subjected to a reaction, and polyurethane prepolymer a<1> is obtained; micromolecular chain extender, hydrophilic chain extender I, a solvent and a catalyst are added, and waterborne polyurethane prepolymer a<2> is obtained by a reaction; then a solvent and hydrophilic chain extender II are added, and waterborne polyurethane prepolymer a<3> is obtained by a reaction; a solvent is added, a salt-forming agent is added under high-speed shearing, water is added for high-speed dispersion and emulsification after even stirring is conducted, then later chain extender diluted with water of 3-5 times is added, and the solvents are removed in vacuum to obtain the product. According to the preparation method, disulfide bonds are introduced in the soft segment and hard segment of waterborne polyurethane, so that the modulus of the waterborne polyurethane is effectively reduced, the strength of the waterborne polyurethane is improved, the waterborne polyurethane has the self-repairing property, and thus self-repairing of polyurethane is achieved without any repairing agent.

Description

technical field [0001] The invention relates to the field of water-based polyurethane, in particular to a self-repairing low-modulus high-strength water-based polyurethane and a preparation method thereof. Background technique [0002] Polyurethane is a general term for a class of polymer compounds whose main chain contains urethane units. It is a multi-block polymer formed by the gradual polymerization of polyols, small molecule chain extenders and polyisocyanates. The polyol constitutes the soft segment, and the small molecule chain extender and polyisocyanate constitute the hard segment. By adjusting the composition and ratio of the soft and hard segments, the molecular structure and physical and chemical properties of polyurethane can be effectively controlled. The polarity of the hard segment is strong and it is easy to aggregate; the thermodynamic incompatibility between the hard segment and the soft segment can form a microphase separation. The microphase separation ...

Claims

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Application Information

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IPC IPC(8): C08G18/42C08G18/48C08G18/12C08G18/66C08G18/75C08G18/32C08G18/34C08G18/38
Inventor 陶灿徐杰王继印戎佳萌贾娟潘轸
Owner 安徽思敬齐环保材料有限公司
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