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Nonionic self-emulsifying water-based epoxy curing agent with Gemini surfactant structure and preparation method thereof

A surfactant and non-ionic technology, used in the field of non-ionic self-emulsifying water-based epoxy curing agent and its preparation, can solve the problems of poor compatibility of water-based epoxy systems, poor water resistance of coating films, and short pot life. Achieve excellent wettability, improve flexibility and increase hardness

Inactive Publication Date: 2015-01-07
GUANGZHOU SUPER CHEM COATING CO LTDGUANGZHOU SUPER CHEM COATING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of Gemini surfactants in water-based epoxy curing agents is basically zero. Therefore, in combination with the development direction of type III water-based epoxy curing agents, a non-ionic self-emulsifying water-based epoxy curing agent with a Gemini surfactant structure is prepared. It has important theoretical innovation and practical application significance. At the same time, it can also overcome the poor stability of the current water-based epoxy curing agent, the poor compatibility of the water-based epoxy system after mixing, and the short pot life. And the water resistance of the coating film is poor, low hardness and other series of problems

Method used

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  • Nonionic self-emulsifying water-based epoxy curing agent with Gemini surfactant structure and preparation method thereof
  • Nonionic self-emulsifying water-based epoxy curing agent with Gemini surfactant structure and preparation method thereof
  • Nonionic self-emulsifying water-based epoxy curing agent with Gemini surfactant structure and preparation method thereof

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preparation example Construction

[0039] A preparation method of a nonionic self-emulsifying water-based epoxy curing agent with a Gemini surfactant structure, the steps are as follows:

[0040] 1) Put the alkylphenol, polyamine, and formaldehyde solution in a solvent to carry out the Mannich reaction, and remove the solvent and by-products after the reaction to obtain the Mannich amine containing the primary amino group;

[0041] 2) Fully react the Mannich amine containing primary amino groups prepared above with diglycidyl ether, after the reaction is completed, lower the temperature, add water to fully disperse to form an emulsion, and obtain the product.

[0042] Preferably, the steps are as follows:

[0043] 1) Dissolve alkylphenols and polyamines in a solvent with a molar ratio of 1:1, mix them evenly and place them in a reactor, gradually raise the temperature to 70-90°C under stirring conditions, and then add dropwise an equimolar Formaldehyde solution (that is, the amount of formaldehyde in the forma...

Embodiment 1

[0053] Preparation of nonionic self-emulsifying waterborne epoxy curing agent with Gemini surfactant structure:

[0054] (1) 78.7g p-dodecyl-phenol (Suifenhe Wanfengyuan Economic and Trade Co., Ltd., Chinese name can also be called p-dodecylphenol, 4-dodecylphenol), 43.9g triethylene Tetramine was dissolved in 60ml ethanol solvent, placed in a three-necked flask equipped with a thermometer, agitator and condenser, and gradually heated up to 80°C under stirring conditions, and 23.4g of 38% mass fraction was added dropwise to it after the temperature was constant. Formaldehyde aqueous solution, keep the constant temperature reaction for 5 hours after the dropwise addition within 30 minutes, after the reaction is completed, the solvent ethanol, water and other volatile components are removed by distillation under reduced pressure at 50 ° C, and transparent Mannich amine containing primary amines is obtained;

[0055] (2) Slowly raise the temperature of the Mannich amine containin...

Embodiment 2

[0064] Preparation of nonionic self-emulsifying waterborne epoxy curing agent with Gemini surfactant structure:

[0065] (1) Dissolve 95.6g p-hexadecyl-phenol (Wuhan Fude Fine Chemical Co., Ltd., Chinese name can also be called p-hexadecylphenol, 4-hexadecylphenol), 18.0g ethylenediamine In 230ml of propylene glycol methyl ether solvent, place in a three-necked flask equipped with a thermometer, a stirrer and a condenser, gradually heat up to 90°C under stirring conditions, and dropwise add 23.4g of 38% Formaldehyde aqueous solution, keep the constant temperature reaction for 8 hours after the dropwise addition within 90 minutes, after the reaction is completed, distill off the solvent propylene glycol methyl ether, water and other volatile components at 90 ° C under reduced pressure to obtain transparent Mannich amine containing primary amine; ( 2) Slowly raise the temperature of the above-prepared Mannich amine containing primary amine to 80°C, and add 120.0g of polyethylene...

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Abstract

The invention discloses a nonionic self-emulsifying water-based epoxy curing agent with Gemini surfactant structure, of which the molecular general formula is disclosed in the specification. The preparation method comprises the following steps: 1) adding alkyl phenol, polyamine and formalin in a solvent to carry out Mannich reaction, and removing the solvent and byproduct after the reaction finishes, thereby obtaining Mannich amine containing primary amine group; and 2) sufficiently reacting the Mannich amine containing primary amine group with diglycidyl ether, cooling after the reaction finishes, adding water, and sufficiently dispersing to obtain an emulsion, thereby obtaining the product. The synthesis technique is simple and pollution-free; the synthesized curing agent does not need to perform salification reaction to implement self-emulsifying action by using organic acid; the epoxy curing agent has the advantages in the Gemini surfactant and has the characteristics of excellent wettability, excellent emulsibility, excellent stability and the like; and the epoxy curing agent can directly emulsify and cure the liquid epoxy resin, and can also cure an epoxy resin dispersion solution.

Description

technical field [0001] The invention relates to a nonionic self-emulsifying water-based epoxy curing agent with a Gemini surfactant structure and a preparation method thereof. Background technique [0002] Epoxy resin has excellent adhesion, radiation resistance, thermal stability, acid and alkali resistance, insulation and high mechanical strength, which endows epoxy coatings with excellent physical and chemical properties, making it a popular choice in the coatings industry. One of the pillar products. In recent years, with the gradual improvement of people's awareness of environmental protection, they have become increasingly vigilant about the serious harm caused by organic solvents to the ecological environment; the issuance of laws and regulations on the control of volatile organic compounds (VOC) has made the coating industry move towards low VOC, low HAP, High-efficiency, energy-saving, and ecological development. Water-based epoxy coatings use water as the dispers...

Claims

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Application Information

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IPC IPC(8): C08G59/64C07C217/28C07C213/04
Inventor 高南马超张虎
Owner GUANGZHOU SUPER CHEM COATING CO LTDGUANGZHOU SUPER CHEM COATING CO LTD
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