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Method for preparing aqueous epoxy resin curing agents

A water-based epoxy resin and curing agent technology, applied in the field of fine chemicals, can solve problems such as the gap between the water resistance of the cured product and the solvent-based epoxy system, and achieve the effect of improving comprehensive performance and increasing compatibility.

Inactive Publication Date: 2011-05-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the introduction of hydrophilic surfactants and (or) water-soluble polymers (as colloidal protective agents) in the existing water-based epoxy systems, especially the third generation water-based epoxy systems, the water resistance of the cured products is not as good as that of solvent-based epoxy systems. There is a certain gap in the oxygen system, which needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: with a isoflurane diketone diisocyanate (IPDI), b dimethylol propionic acid, c polycaprolactone diol, d bisphenol A, e organic solvent N-methylpyrrolidone, f catalyst dilaurel Mix dibutyltin acid evenly and react at 80°C for 3 hours to obtain a polyurethane prepolymer, then add g blocking agent imidazole to the polyurethane prepolymer, react at 90°C for 4 hours, then cool down to 40°C, and finally place the cooled product in h And in the mixture of agent imidazole and i deionized water, obtain water-based epoxy resin curing agent through stirring emulsification, filtration;

[0019] Wherein the substance ratio of a, b, c, d is 1.0: 0.3: 0.3: 0.2;

[0020] e and f account for 10% and 0.05% of the total mass of a, b, c, and d, respectively;

[0021] The amount of substance in g is 100% of the amount of free isocyanate group substance in polyurethane prepolymer;

[0022] The amount of substance h is 70% of the amount of substance b;

[0023] i accounts for...

Embodiment 2

[0025] Embodiment 2: A toluene diisocyanate (TDI), b dimethylol propionic acid, c polycarbonate diol, d bisphenol A, e organic solvent acetone, f catalyst dibutyltin dilaurate are mixed homogeneously and in 100 React at ℃ for 4 hours to obtain a polyurethane prepolymer, then add g blocking agent 2-methylimidazole to the polyurethane prepolymer, react at 80℃ for 5 hours, then cool down to 46℃, and finally place the cooled product in h neutralizing agent 1- In the mixture of methylpyrazole and deionized water, water-based epoxy resin curing agent is obtained through stirring and emulsifying and filtering;

[0026] Wherein the substance ratio of a, b, c, d is 1.0: 0.1: 0.1: 0.5;

[0027] e and f account for 80% and 0.01% of the total mass of a, b, c, and d, respectively;

[0028] The amount of substance in g is 103% of the amount of free isocyanate group substance in the polyurethane prepolymer;

[0029] The amount of substance h is 90% of the amount of substance b;

[0030] i...

Embodiment 3

[0031] Embodiment 3: with a diphenylmethane diisocyanate (MDI), b dimethylol propionic acid, c polyoxypropylene ether glycol, d bisphenol A, e organic solvent dimethyl formamide, f catalyst dilauric acid Mix dibutyltin evenly and react at 90°C for 5 hours to obtain a polyurethane prepolymer, then add g blocking agent 4-methylimidazole to the polyurethane prepolymer, react at 105°C for 3 hours, then cool down to 37°C, and finally place the cooled product In the mixture of h neutralizing agent 3-methylpyrazole and i deionized water, the water-based epoxy resin curing agent is obtained through stirring and emulsifying and filtering;

[0032] Wherein the substance ratio of a, b, c, d is 1.0: 0.5: 0.2: 0.1;

[0033] e and f account for 200% and 0.08% of the total mass of a, b, c, and d, respectively;

[0034] The amount of substance in g is 108% of the amount of free isocyanate group substance in polyurethane prepolymer;

[0035] The amount of substance h is 110% of the amount of...

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Abstract

The invention relates to a method for preparing aqueous epoxy resin curing agents, which comprises the following steps: firstly, uniformly mixing vulcabond, dimethylolpropionic acid, terminal hydroxyl polymers, bisphenol A, organic solvents and catalysts, preparing terminal isocyanate polyurethane performed polymers through prepolymefization reaction, using imidazole and imidazole derivatives or pyrromonazole and imidazole derivatives as terminal sealing agents for reaction, and finally, neutralizing the imidazole and the imidazole derivatives or the pyrromonazole and the imidazole derivatives to obtain the aqueous epoxy resin curing agents. In the method provided by the invention, because both the sealing agents and the neutralizing agents can react with epoxy resin, no existence of free components after curing is ensured, active -NCO released after the sealing removal can react with carboxylic acid to reduce the hydrophilicity of a system and can also react with the epoxy resin to increase the cross linking density of curing objects, the toughening effect can be realized on the epoxy resin through the induction of the terminal hydroxyl polymers, and the bisphenol A can be used for enhancing the compatibility of the curing agents and the epoxy resin and improving the integrated performance of the curing objects.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a preparation method of a water-based epoxy resin curing agent. Background technique [0002] Waterborne epoxy system has been widely used because of its low VOC, small odor, better physical and chemical properties and many other advantages. The first and second generation water-based epoxy systems are both oil-based epoxy resin and water-based epoxy curing agent mixed, the compatibility of the two is poor, not only sandwich curing occurs, but also the free components in the system greatly affect the cured product final performance. The epoxy resin and curing agent in the third-generation water-based epoxy system are both water dispersions, which improves the compatibility of the two and significantly reduces the degree of sandwich curing; in addition, the curing agent is self-emulsifying and hydrophilic The surfactant is connected to the molecules of the resin and cur...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/66C08G18/32C08G59/40C08G59/50C08L63/00C08L75/04
Inventor 李刚辉沈一丁李新赖小娟
Owner SHAANXI UNIV OF SCI & TECH
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