Solvent-free hydrophobic self-repairing polyurethane coating and preparation method thereof

A polyurethane coating and self-repairing technology, which is applied in the field of polyurethane, can solve the problems of using solvents, no self-cleaning, and non-durable coatings, and achieve the effects of increased service life, short repair time, and excellent performance

Active Publication Date: 2018-11-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problems that the traditional polyurethane coating uses solvents, the coating is not durable and has no self-cleaning, and the preparation method is fast, simple and harmless

Method used

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  • Solvent-free hydrophobic self-repairing polyurethane coating and preparation method thereof
  • Solvent-free hydrophobic self-repairing polyurethane coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1: Mix 0.2 parts of graphene oxide, 1.8 parts of octadecylamine and 120 parts of ethanol, stir and react at 65°C for 22 hours, and dry in vacuum at 60°C to obtain modified graphene oxide;

[0033] Step 2: Under the protection of an inert gas, mix a certain amount of polyisocyanate and polyol evenly, and react at 60°C for 2 hours, measure the content of -NCO in the system to determine the end of the reaction, and prepare an isocyanate-terminated pre-isocyanate with a content of -NCO of 5%. Polymer;

[0034] Step 3: under the protection of an inert gas, add furylamine to the above prepolymer, n (FMA): n (-NCO)=2:1, stirring and reacting at 80°C for 30 minutes, raising the temperature to 90°C and continuing stirring and reacting for 6 hours, so that the content of -NCO in the system is completely consumed, and furan ring-terminated polyurethane is obtained;

[0035] Step 4: under the protection of an inert gas, add bismaleimide to the above furan ring-terminated pol...

Embodiment 2

[0038] Step 1: Mix 0.3 parts of graphene oxide, 2.1 parts of octadecylamine and 150 parts of ethanol, stir and react at 75°C for 24 hours, and dry in vacuum at 60°C to obtain modified graphene oxide;

[0039] Step 2: Under the protection of an inert gas, mix a certain amount of polyisocyanate and polyol evenly, and react at 70°C for 2 hours, measure the content of -NCO in the system to determine the end of the reaction, and prepare an isocyanate-terminated pre-isocyanate with a content of -NCO of 5%. Polymer;

[0040] Step 3: under the protection of an inert gas, add furylamine to the above prepolymer, n (FMA): n (-NCO)=2:1, stirring and reacting at 80°C for 30 minutes, raising the temperature to 90°C and continuing stirring and reacting for 6 hours, so that the content of -NCO in the system is completely consumed, and furan ring-terminated polyurethane is obtained;

[0041] Step 4: under the protection of an inert gas, add bismaleimide to the above furan ring-terminated pol...

Embodiment 3

[0044] Step 1: Mix 0.3 parts of graphene oxide, 2.1 parts of octadecylamine and 150 parts of ethanol, stir and react at 80°C for 24 hours, and dry in vacuum at 60°C to obtain modified graphene oxide;

[0045] Step 2: Under the protection of an inert gas, mix a certain amount of polyisocyanate and polyol evenly, and react at 80°C for 2 hours, measure the content of -NCO in the system to determine the end of the reaction, and prepare an isocyanate-terminated pre-isocyanate with a content of -NCO of 6%. Polymer;

[0046] Step 3: under the protection of an inert gas, add furylamine to the above prepolymer, n (FMA): n (-NCO)=2:1, stirring and reacting at 80°C for 30 minutes, then raising the temperature to 100°C and continuing to stir and react for 6 hours, so that the content of -NCO in the system is completely consumed, and furan ring-terminated polyurethane is obtained;

[0047] Step 4: under the protection of an inert gas, add bismaleimide to the above furan ring-terminated p...

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Abstract

The invention belongs to the field of polymer materials, and discloses a preparation method of a thermoreversible self-repairing solvent-free hydrophobic coating; polyisocyanate, polyhydric alcohol, furfuryl amine, bismaleimide and graphene oxide and other raw materials are used to synthesize a bifunctionality polyurethane coating with a coarse structure and a furan-maleimide addition product. Thespecific steps are as follows: (1) preparing a prepolymer having an isocyanate group; (2) preparing a furan-terminated prepolymer; (3) preparing bifunctionality polyurethane containing furan-maleimide; and (4) preparing a low surface energy polyurethane coating. The self-repairing solvent-free hydrophobic coating has simple preparation process, excellent performance, and high tensile strength andelongation at break, a raw material can be repaired from damage in only 4 minutes at the temperature of 120DEG C, material life cycle cost is reduced, and material service life is extended.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, in particular to a solvent-free hydrophobic self-healing polyurethane coating and a preparation method thereof. Background technique [0002] In recent years, energy saving, emission reduction and environmental protection have become the focus of attention all over the world. Polyurethane has excellent properties such as corrosion resistance, wear resistance and elasticity, which make it widely used in daily life. The traditional solvent-based polyurethane coating process The use of a large amount of solvents in the process endangers the health of processing workers and causes environmental pollution. Solvent residues in finished products will affect product quality and cause harm to users and the environment. The development of solvent-free polyurethane and its coating preparation technology is one of the effective methods to solve the solvent pollution of traditional solvent-based polyuret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/06C08L75/04C08K9/04C08K3/04C08K5/3415
CPCC08J7/06C08J2375/04C08K5/3415C08K9/04C08K3/042
Inventor 罗晓民胡文杰冯见艳白鹏霞郑驰
Owner SHAANXI UNIV OF SCI & TECH
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