Self-repairing waterborne polyurethane-polyacrylic acid emulsion and preparation method thereof

A technology of polyacrylic acid emulsion and water-based polyurethane, which is applied in the direction of coating, etc., can solve the problems of shortening the service life of materials, becoming sticky at high temperature, poor tensile performance, etc., and achieves the effect of strong self-healing ability

Pending Publication Date: 2021-02-26
安徽程涵科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Water-based polyurethane (WPU) refers to the formation of polyurethane resin dissolved or dispersed in water. It has the advantages of low toxicity, non-combustibility, and no pollution to the environment. During use, mechanical damage caused by friction, collision, and bending will damage the appearance of the material. , Affect the material performance, and ultimately shorten the service life of the material
[0003] Polyacrylate materials have the properties of weather resistance, water resistance, pollution res

Method used

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  • Self-repairing waterborne polyurethane-polyacrylic acid emulsion and preparation method thereof
  • Self-repairing waterborne polyurethane-polyacrylic acid emulsion and preparation method thereof
  • Self-repairing waterborne polyurethane-polyacrylic acid emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0028]Such asfigure 1As shown,figure 1It is a flow chart of the preparation method of the self-healing waterborne polyurethane-polyacrylic acid emulsion. The preparation method of the self-repairing water-based polyurethane-polyacrylic acid emulsion of the present invention, the raw materials are calculated in parts by mass, including the steps:

[0029]S1, heating 60~120 parts of polymer polyol to 100℃~130℃, vacuum dehydration for 1h~2h;

[0030]S2, the solution obtained in step S1 is protected by nitrogen, and the temperature is lowered to 60℃~90℃, 30~60 parts of polyisocyanate and 0.01~0.03 parts of catalyst are added, react for 1h~3h, and 30~60 parts of organic solvent are added to adjust the viscosity ;

[0031]S3, adding 5-10 parts of hydrophilic chain extender to the solution obtained in step S2, and reacting at 50°C to 90°C for 1h to 3h;

[0032]S4, adding 5 to 15 parts of disulfide bond compound and 5 to 10 parts of acylhydrazone bond compound to the solution obtained in step S3, and r...

Example Embodiment

[0050]Example one

[0051]The preparation method of the self-healing water-based polyurethane-polyacrylic acid emulsion, the raw materials are calculated in parts by mass, including the steps:

[0052]S1, adding 100 parts of polytetrahydrofuran glycol to the reactor, and vacuum dehydration treatment at 120°C for 2 hours;

[0053]S2, in N2Under protection, the temperature is lowered to 80°C, 44.5 parts of isophorone diisocyanate and 0.03 parts of dibutyltin dilaurate are added, and the reaction is heated at 90°C for 3 hours, and 40 parts of N-methylpyrrolidone are used to adjust the viscosity;

[0054]S3, cooling down to 70℃, adding 8 parts of sodium N-(2-aminoethyl)-2-aminoethane sulfonate and reacting for 3h

[0055]S4, cooling down to 50℃, adding 10 parts of 4,4′-diaminodiphenyl sulfide and 5 parts of quinone oxime hydrazone to react for 2 hours;

[0056]S5, add 10 parts of hydroxyethyl methacrylate (HEMA), and react at 90°C for 3h;

[0057]S6: Add 10 parts of acrylic acid, 20 parts of acrylate, 30 pa...

Example Embodiment

[0062]Example two

[0063]The preparation method of the self-healing water-based polyurethane-polyacrylic acid emulsion, the raw materials are calculated in parts by mass, including the steps:

[0064]S1, adding 100 parts of polycaprolactone diol to the reactor, vacuum dehydration treatment at 120°C for 2h;

[0065]S2, in N2Under protection, reduce the temperature to 70°C, add 50 parts of 4,4-diphenylmethane diisocyanate (MDI) and 0.02 parts of stannous octoate, and react at 85°C for 3 hours, 40 parts of 20ml dioxane to adjust the viscosity;

[0066]S3, cooling down to 70°C, adding 10 parts of sodium ethylenediaminoethane sulfonate to react for 3h;

[0067]S4, increase the temperature to 50°C, add 12 parts of 4,4′-dihydroxydiphenyl sulfide, 6 parts of fluopyron hydrazone, and react for 3 hours;

[0068]S5, add 10 parts of hydroxyethyl acrylate (HEA), and react at 90°C for 2h;

[0069]S6, adding 10 parts of acrylic acid (AA), 20 parts of methyl methacrylate, 20 parts of styrene, and 0.010 parts of azobis...

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Abstract

The invention discloses a self-repairing waterborne polyurethane-polyacrylic acid emulsion and a preparation method thereof. The preparation method comprises the steps of firstly, synthesizing a polyurethane prepolymer containing a disulfide bond and an acylhydrazone bond, and carrying out end capping by utilizing hydroxy acrylic acid to prepare a polyurethane prepolymer with double bonds; and then carrying out free radical copolymerization with acrylic acid, and finally salifying and emulsifying to obtain the waterborne polyurethane-polyacrylic acid emulsion containing the disulfide bond. According to the invention, damage repair is achieved through reversible reaction chemical bonds of the disulfide bond and the acylhydrazone bond and the hydrogen-bond interaction of polyurethane-polyacrylic acid, and the method has the advantages of being high in self-repair force, capable of self-healing cracks and damaged coatings and capable of being carried out infinitely.

Description

technical field [0001] The invention relates to the technical field of self-repairing polymers, in particular to a self-repairing water-based polyurethane-polyacrylic acid emulsion and a preparation method thereof. Background technique [0002] Water-based polyurethane (WPU) refers to the formation of polyurethane resin dissolved or dispersed in water. It has the advantages of low toxicity, non-combustibility, and no pollution to the environment. During use, mechanical damage caused by friction, collision, and bending will damage the appearance of the material. , Affect the material performance, and ultimately shorten the service life of the material. [0003] Polyacrylate materials have the properties of weather resistance, water resistance, pollution resistance, acid resistance, alkali resistance, good transparency, etc., and the production cost is low, but there are also problems such as easy to become brittle at low temperature, sticky at high temperature, poor solvent r...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F220/06C08F220/10C08F220/14C08F212/08C09D151/08
CPCC08F283/008C09D151/08C08F220/06C08F220/10C08F220/14C08F212/08
Inventor 胡先海章旭徐艳李锡良
Owner 安徽程涵科技有限公司
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