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Synthesis of waterborne epoxy curing agent and preparation method of waterborne epoxy curing agent

A water-based epoxy and curing agent technology, applied in the direction of epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems of short application period of anti-corrosion paint, improve hydrophilicity, improve construction performance, enhance phase capacitive effect

Inactive Publication Date: 2017-08-18
深圳市深赛尔股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a synthesis of water-based epoxy curing agent and its preparation method, to solve the problem of short construction pot life of anti-corrosion paint, and further improve the water resistance of the coating

Method used

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  • Synthesis of waterborne epoxy curing agent and preparation method of waterborne epoxy curing agent
  • Synthesis of waterborne epoxy curing agent and preparation method of waterborne epoxy curing agent
  • Synthesis of waterborne epoxy curing agent and preparation method of waterborne epoxy curing agent

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preparation example Construction

[0037] The preparation method of water-based curing agent is completed according to the following steps:

[0038] 1) Introducing a hydrophilic segment: use polypropylene glycol diglycidyl ether (epoxy value 0.28 to 0.36) to react with triethylenetetramine, and drop triethylenetetramine into a three-necked flask equipped with a condenser at a temperature of 60°C In the middle, after the dropwise addition is completed, the temperature is controlled at 65°C, the rotation speed is 50-100r / min, and the reaction is performed for 1-2 hours. The measured amine value is 530±20mgKOH / g. The recommended molar ratio of triethylenetetramine to polypropylene glycol diglycidyl ether is 2.3-2.6:1.

[0039] 2) Introduce epoxy resin for modification: in the aforementioned reaction device, drop epoxy adducts in a molar ratio of 0.5-0.7, (the epoxy adducts are bisphenols with a mass ratio of 1:1 A mixture of epoxy resin and propylene glycol methyl ether.), control the reaction temperature at 65 °...

Embodiment 1

[0046] Polyether polyol diglycidyl ether and triethylenetetramine were selected for addition reaction to prepare an intermediate containing a hydrophilic segment. The reaction temperature was 65° C. and the reaction time was 2 hours. The molar ratio of triethylenetetramine to polyether polyol diglycidyl ether is 2.2:1. Then drop epoxy adduct in 0.5-0.7 by molar ratio, (this epoxy adduct is the mixture of bisphenol A type epoxy resin and propylene glycol methyl ether according to mass ratio 1:1.) Control reaction temperature At 65°C, the reaction was continued for about 3 hours after the dropwise addition was completed. Adjust the solid content of the aforementioned reaction product to 50% with propylene glycol methyl ether, which is a water-based epoxy curing agent.

[0047] Use this curing agent to prepare a water-based zinc-rich primer, spray it on the surface-treated steel plate for containers, test performance: bake in an oven at 50°C for 10 minutes, observe water stains ...

Embodiment 2

[0049] Polyether polyol diglycidyl ether and triethylenetetramine were selected for addition reaction to prepare an intermediate containing a hydrophilic segment. The reaction temperature was 65° C. and the reaction time was 2 hours. The molar ratio of triethylenetetramine to polyether polyol diglycidyl ether is 2.2:1. Then drop the epoxy adduct in a molar ratio of 0.5-0.7, (the epoxy adduct is a mixture of bisphenol A type epoxy resin and propylene glycol methyl ether according to a mass ratio of 1:1.), control the reaction The temperature was 65°C, and the reaction was continued for 3 hours after the dropwise addition was completed. Finally, it is capped with a capping agent. The material molar ratio (chain-extended product of amino-terminated intermediate / phenyl glycidyl ether) was 5 / 7, and the reaction was carried out at 100° C. for 2 hours. Also adjust the solid content to 50% with propylene glycol methyl ether to obtain a blocked water-based epoxy curing agent.

[005...

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Abstract

The invention discloses synthesis of a waterborne epoxy curing agent and a preparation method of the waterborne epoxy curing agent. The raw materials used for the composition include polyether polyol diglycidyl ether, polyamine, an epoxy affixture and a siloxane end-capping reagent at the mole ratio of 1:(2.3-2.6):(0.5-0.7):(1-1.2). A hydrophilic segment polypropylene glycol diglycidyl ether is introduced into the waterborne epoxy curing agent, so that the hydrophilicity is improved; and meanwhile, a silane group is also introduced and has good water resistance, so that a series of research experiments prove that a paint film does not turn white, does not bubble and is not softened after being soaked into cold water for 168h through introduction of water-based silane, and the water resistance of the paint film and the adhesive force on a base material are significantly improved.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to the synthesis and preparation method of a low-cost high-performance water-based epoxy curing agent. Background technique [0002] At present, the environmental protection situation is particularly severe, and the water-based paint for containers is imminent. However, there are still many unsatisfactory aspects in applying the new material of water-based epoxy curing agent directly to anti-corrosion coatings as a film-forming material. Generally, the synthesis of materials such as water-based epoxy curing agents is generally prepared by introducing polyetheramine into epoxy resin for chain extension, and then using a single epoxy group capping agent for capping. However, the coating prepared by this kind of water-based epoxy curing agent has problems such as slow surface drying speed during film formation, long time-consuming improvement of comprehensive performance, easy w...

Claims

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Application Information

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IPC IPC(8): C08G59/64C08G65/331C08G65/333C08G65/336C08G81/00C09D5/08C09D163/00
CPCC08G65/33306C08G59/64C08G65/331C08G65/336C08G81/00C09D5/08C09D163/00
Inventor 胡克倩张驰
Owner 深圳市深赛尔股份有限公司
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