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Method for preparing grease/rosin-based polyamide aqueous epoxy curing agent

A technology of rosin-based polyamide and water-based epoxy, which is applied in the direction of epoxy resin coatings and coatings, and can solve the problems of poor chemical resistance, poor compatibility, poor chemical resistance and moisture resistance of coating films, etc. , to achieve the effect of improving mechanical strength, reducing excessive dependence and improving compatibility

Active Publication Date: 2011-04-27
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compatibility of mono fatty acid modified amidated polyamine curing agent with epoxy resin is not very good, it is prone to phase separation and surface defects such as slick oil and pits appear on the surface of the coating film, and the insufficient curing causes the coating film to be damaged. Poor chemical and moisture resistance
The polyamide curing agent emulsified epoxy resin system synthesized by ordinary dimer fatty acid has a short pot life, and generally it will gel within 1 hour, which will bring some troubles to the construction, and the chemical resistance is poor
The polyamine modified with epoxy resin has good compatibility with epoxy resin, and it has water solubility. There are reports on epoxy-amine water-based epoxy curing agent both at home and abroad.
U.S. Patents US 5567748, US 6277928, US 6653369 and other patented technologies involve epoxy-amine water-based epoxy curing agents, but the preparation process is very complicated, the cost is high, and it is difficult to industrialize

Method used

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  • Method for preparing grease/rosin-based polyamide aqueous epoxy curing agent
  • Method for preparing grease/rosin-based polyamide aqueous epoxy curing agent
  • Method for preparing grease/rosin-based polyamide aqueous epoxy curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Preparation of grease / rosin-based polyamide

[0049] In a 1000ml three-necked flask equipped with a heating mantle, a stirring device, a thermometer, a reflux condenser and a distillation device, add 1 mole of grease / rosin-based dibasic acid and 2.2 moles of diethylenetriamine, heat up to 150°C, and reflux for 1 After 1 hour, heat up to 210° C. for 4 hours to react, and vacuum distill to remove water and free amine to obtain a grease / rosin-based polyamide epoxy resin curing agent.

[0050] (2) Preparation of grease / rosin-based polyamide adduct

[0051] Add 0.6 moles of benzyl glycidyl ether to the grease / rosin-based polyamide epoxy resin curing agent prepared in step (1), slowly heat up to 60°C and stir until the amine value is less than 250 mg / g to obtain grease / Adducts of rosin-based polyamides.

[0052] (3) Synthesis of grease / rosin-based polyamide waterborne epoxy curing agent

[0053] Then to the grease / rosin-based polyamide adduct prepared in the second step...

Embodiment 2

[0056] (1) Preparation of grease / rosin-based polyamide

[0057] In a 1000ml three-neck flask equipped with a heating mantle, a stirring device, a thermometer, a reflux condenser and a distillation device, add 1 mole of grease / rosin-based dibasic acid and 2.2 moles of triethylenetetramine, heat up to 150°C, and reflux for 1 After 1 hour, heat up to 210° C. for 4 hours to react, and vacuum distill to remove water and free amine to obtain grease / rosin-based polyamide.

[0058] (2) Preparation of grease / rosin-based polyamide adduct

[0059] Add 0.4 moles of chain extender E-51 propylene glycol methyl ether solution to the oil / rosin-based polyamide prepared in step (1), slowly heat up to 60°C and stir until the amine value is less than 250 mg / g, and the oil is obtained / Adducts of rosin-based polyamides.

[0060] (3) Synthesis of grease / rosin-based polyamide waterborne epoxy curing agent

[0061] Then, in the adduct of grease / rosin-based polyamide prepared in the second step, sl...

Embodiment 3

[0063] (1) Preparation of grease / rosin-based polyamide

[0064] In a 1000ml three-neck flask equipped with a heating mantle, a stirring device, a thermometer, a reflux condenser and a distillation device, add 1 mole of grease / rosin-based dibasic acid and 2.2 moles of tetraethylenepentamine, heat up to 150°C, and reflux for 1 After 1 hour, heat up to 210° C. for 4 hours to react, and vacuum distill to remove water and free amine to obtain grease / rosin-based polyamide.

[0065] (2) Preparation of grease / rosin-based polyamide adduct

[0066] Add 0.5 moles of chain extender E-51 propylene glycol methyl ether solution to the oil / rosin-based polyamide prepared in step (1), slowly heat up to 60°C and stir until the amine value is less than 250 mg / g, and the oil is obtained / Adducts of rosin-based polyamides.

[0067] (3) Synthesis of grease / rosin-based polyamide waterborne epoxy curing agent

[0068] Then to the grease / rosin-based polyamide adduct prepared in the second step, slow...

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Abstract

The invention discloses a method for preparing grease / rosin-based polyamide aqueous epoxy curing agent, which prepares the grease / rosin-based polyamide aqueous epoxy curing agent according to the reaction formulae in the following steps: 1, synthesis of grease / rosin-based polyamide, namely reacting grease / rosin-based diacid and polyamine to obtain grease / rosin-based polyamide; 2, synthesis of addition product of grease / rosin-based polyamide, namely reacting the product of the first step with a chain extender to obtain the addition product of grease / rosin-based polyamide; and 3, obtaining the grease / rosin-based polyamide aqueous epoxy curing agent product by terminalling. In the invention, the ring structure of rosin is introduced into the diacid, so both the mechanical strength and thermal resistance of the system and the compatibility of the aqueous curing agent with aqueous epoxy resin are improved on the basis of ensuring the flexibility of the original system. When the aqueous epoxy curing agent is used in combination with the aqueous epoxy resin, the working life of the system is prolonged due to the large steric hindrance of the ring structure in rosin.

Description

technical field [0001] The invention belongs to the field of epoxy resin curing agents, and in particular relates to a method for preparing a water-based epoxy curing agent from grease / rosin-based dibasic acid. Background technique [0002] Epoxy resin coatings have the characteristics of high hardness, good wear resistance, high adhesion and excellent chemical resistance, and are widely used in the field of coating. In recent years, with the continuous improvement of people's awareness of environmental protection, many countries have promulgated environmental regulations to limit volatile organic solvents (volatile organic compounds: VOC), and water-based coatings have become an important trend in the development of coatings. Water-based epoxy coatings not only have good chemical resistance, adhesion, physical and mechanical properties, and electrical insulation properties of solvent-based epoxy coatings, but also have the characteristics of low pollution, easy construction...

Claims

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Application Information

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IPC IPC(8): C08G69/50C08G69/26C08G59/44C09D163/00
Inventor 夏建陵杨小华黄坤李梅连建伟
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY