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Self-repairing polyurethane coating and preparation method thereof

A polyurethane coating, self-healing technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the complex preparation process of the microcapsule repair method, the influence of coating transparency and film formation, and the inability to achieve multiple repairs, etc. problems, to achieve the effect of easy control of the synthesis process, improved physical and mechanical properties, and high yield

Active Publication Date: 2015-02-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the microcapsule repair method is complicated, the cost is high, and the application of the coating has great limitations, and it cannot be repaired multiple times; the thermal reversible repair method requires a specific repair environment or condition, and the transparency of the coating properties and film-forming properties are easily affected; Chinese invention patent CN102153856B reports a photoreversible self-healing polyurethane film, which needs to be irradiated with 350nm ultraviolet light for 10 to 200 minutes or irradiated with sunlight for 3 to 5 hours to repair cracks, that is, it needs Restoration can only be achieved under the stimulation of external conditions
There are no relevant literature reports on self-healing polyurethane coatings

Method used

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  • Self-repairing polyurethane coating and preparation method thereof
  • Self-repairing polyurethane coating and preparation method thereof
  • Self-repairing polyurethane coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Synthesis of hydrophilic polyurethane prepolymer: In terms of mass fraction, add 40 parts of polyethylene glycol and 3 parts of 1,4-butanediol chain extender into the Erlenmeyer flask, stir evenly, heat up to 120 ° C, and make Keep the vacuum degree of the reaction system above 0.08MPa. After dehydration for 3 hours, place it to lower the temperature to 60°C; then, add 15 parts of isophorone diisocyanate dropwise, and keep the reaction system at a temperature of 85°C The reaction was carried out for 3 hours, and the mass content of ─N═C═O in the prepolymer was determined by di-n-butylamine titration. When the actual measured value is close to the theoretical value, vacuum defoaming, sealed and stored for future use, the isocyanate group mass content of the hydrophilic polyurethane prepolymer is 3.5g / 100g, and the molar concentration is 0.0833mol / 100g;

[0036] Preparation of self-healing polyurethane coating: In terms of mass fraction, add 10 parts of MIC white powder a...

Embodiment 2

[0043] Synthesis of hydrophilic polyurethane prepolymer: Add 60 parts of hydrophilic polyether polyol, 1 part of 1,4-butanediol and 2 parts of trimethylolpropane chain extender into the Erlenmeyer flask, stir evenly, and heat up to 130°C, and keep the vacuum degree of the reaction system above 0.08MPa. After dehydration for 2 hours, place it to lower the temperature to 60°C; then, add 15 parts of isophorone diisocyanate dropwise, and let the reaction The system was reacted at a temperature of 85° C. for 2 hours, and the mass content of ─N═C═O in the prepolymer was determined by di-n-butylamine titration. When the actual measured value is close to the theoretical value, vacuum defoaming, sealed and stored for later use, the mass content of isocyanate group is 2.5g / 100g, and the molar concentration is 0.0595mol / 100g;

[0044] Preparation of self-healing polyurethane coating: Add 7 parts of MIC white powder and 100 mL of chloroform to a Erlenmeyer flask equipped with a mechanical...

Embodiment 3

[0047] Synthesis of hydrophilic polyurethane prepolymer: Add 40 parts of polyethylene glycol and 2 parts of 1,4-butanediol chain extender into the Erlenmeyer flask, stir evenly, heat up to 130°C, and make the vacuum of the reaction system Keep it above 0.08MPa, after dehydration for 2.5 hours, let it stand to lower the temperature to 60°C; then, add 20 parts of 1,6‐hexamethylene diisocyanate dropwise, and make the reaction system at a temperature of 80°C After reacting for 4 hours, the mass content of ─N═C═O in the prepolymer was measured by di-n-butylamine titration method. When the actual measured value is close to the theoretical value, vacuum defoaming, sealed and stored for later use, the mass content of isocyanate group is 4.0g / 100g, and the molar concentration is 0.0952mol / 100g;

[0048] Preparation of self-healing polyurethane coating: Add 10 parts of HMIC white powder and 100 parts of N,N‐dimethylformamide into a Erlenmeyer flask equipped with a mechanical stirring pa...

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Abstract

The invention discloses a self-repairing polyurethane coating and a preparation method thereof. The polyurethane coating comprises the following raw materials in parts by mass: 15-20 parts of polyisocyanates, 40-60 parts of hydrophilic polyester polyol or polyether polyol, 2-3 parts of a chain extender and 7-15 parts of methylcystein. The preparation method comprises the following steps: preparing a hydrophilic polyurethane prepolymer from hydrophilic polyester polyol or polyether polyol and the chain extender, and reacting the isocyanate group in the hydrophilic polyurethane prepolymer with methylcystein, so as to obtain a polyurethane material of which the tail end or the main chain contains 2-urea-4-pyrimidone units; spraying or coating the polyurethane material on the surface of a substrate, thereby obtaining the self-repairing polyurethane coating. The self-repairing of the self-repairing polyurethane coating disclosed by the invention can be completed without external repairing agent or requirements of special environment, the coating is good in transparency, high in strength, good in filming property, simple in process and low in cost, and the function of repeated repairing in same positions can be achieved.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane coating, in particular to a polyurethane coating with self-repairing performance and a preparation method thereof. Background technique [0002] Polyurethane (PU) is a general term for a class of polymer compounds whose main chain contains carbamate (─NH─COO─) units. It is a multi-block polymer formed by the gradual polymerization of polyols, small molecule chain extenders and polyisocyanates. polymer. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32C08G18/12C09D175/06C09D175/08
CPCC08G18/12C08G18/3206C08G18/3246C08G18/48C08G18/4833C08G18/667C08G18/73C08G18/755C09D175/08
Inventor 李光吉林殷雷王立莹陈志锋何德柳
Owner SOUTH CHINA UNIV OF TECH
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