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Self-emulsifying water-borne epoxy resin curing agent and preparation method thereof

A water-based epoxy resin and epoxy resin technology, applied in the coating and other directions, can solve the problems of the decline of the coating film performance, pH value sensitivity, environmental pollution, etc., to achieve a good adaptation period and coating film performance, raw materials are easily available, simplified Effects of process steps

Inactive Publication Date: 2014-06-18
BEIJING BSS CORROSION PROTECTION IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the final curing agent, due to the presence of organic acids, the performance of the coating film will be reduced, and flash rust will easily occur when used on metals, and the organic acids will also pollute the environment; in addition, the cationic water-based epoxy curing The value is relatively sensitive, and when used together with basic pigments and fillers, it is prone to instability

Method used

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  • Self-emulsifying water-borne epoxy resin curing agent and preparation method thereof

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preparation example Construction

[0021] In order to solve the problems in the prior art when preparing self-emulsifying water-based epoxy resin curing agents, the performance of cationic water-based epoxy curing agent coatings formed by neutralization of end-capped products with organic acids is reduced, and flash rust is easy to occur when used on metals. Environmental pollution and sensitivity to pH value and unstable problem when used together with basic pigments and fillers, the invention provides a kind of preparation method of self-emulsifying waterborne epoxy resin curing agent, comprises the following steps: S1, will single Polyamine and epoxy resin are mixed and reacted at a molar ratio of 1.8:1 to 2.1:1 to obtain an intermediate adduct; and S2, using a single epoxy compound to cap the intermediate adduct to obtain a self-emulsifying water-based Epoxy resin curing agent.

[0022] By controlling the molar ratio of a single polyamine and epoxy resin within a certain range for the addition reaction, and...

Embodiment 1

[0039] 1) Take 200g of tetraethylenepentamine (provided by Rizhao Lidex Chemical Co., Ltd.), and add it and liquid epoxy resin E44 (provided by Langfang Nuoerxin Chemical Co., Ltd.) In the three-necked flask reaction device, the molar ratio of tetraethylenepentamine to liquid epoxy resin is 2.0:1, and the three-necked flask is slowly heated to 70°C in a water bath and reacted at a constant temperature for 4 hours to obtain an intermediate adduct, and then depressurized Distill to remove excess tetraethylenepentamine.

[0040] 2) Under the condition of keeping the temperature constant, add the end-capping agent octane epoxy to the intermediate adduct dropwise, in which the epoxy octane (provided by Shanghai Puzhen Biotechnology Co., Ltd.) and the intermediate adduct The molar ratio is 2:1, react at a constant temperature of 70°C for 4 hours, and cool down to room temperature to obtain a self-emulsifying water-based epoxy resin curing agent with a light yellow appearance.

[00...

Embodiment 2

[0044] 1) Take 200g of triethylenetetramine (provided by Tianjin Guangfu Fine Chemical Research Institute), and add it and liquid epoxy resin E51 (provided by Langfang Nuoerxin Chemical Co., Ltd.) In the three-necked flask reaction device, wherein the molar ratio of triethylenetetramine to liquid epoxy resin E51 is 2.1:1, the water bath slowly heats the three-necked flask to 50°C and reacts at a constant temperature for 6 hours to obtain an intermediate adduct, and then reduce Unreacted triethylenetetramine was removed by pressure distillation.

[0045] 2) Under the condition of keeping the temperature constant, add the capping agent o-phenylphenol glycidyl ether (provided by Hangzhou Tuomu Technology Co., Ltd.) dropwise to the intermediate adduct, in which o-phenylphenol glycidyl ether and intermediate The molar ratio of the body adduct is 1:1, react at a constant temperature of 50°C for 6 hours, and cool down to room temperature to obtain a self-emulsifying water-based epoxy...

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Abstract

The invention discloses a self-emulsifying water-borne epoxy resin curing agent and a preparation method thereof. The method comprises the following steps: S1, mixing and reacting single polyamine with epoxy resin according to the molar ratio of (1.8:2) to (2.1:1), so as to obtain an intermediate addition product; S2, blocking the intermediate addition product by adopting a single epoxy compound, so as to obtain the self-emulsifying water-borne epoxy resin curing agent; controlling the molar ratio of the single polyamine to the epoxy resin within a certain range; blocking the addition product by adopting the single epoxy compound, so as to obtain the curing agent which meets the water soluble requirements and has excellent application performance. The self-emulsifying water-borne epoxy resin curing agent has a good adaptive phase and coating property when being applied to a coating. The mode of neutralizing and blocking by adopting an organic acid when the self-emulsifying water-borne epoxy resin curing agent is prepared at present is abandoned, the process is simplified, and the problems that the cation water-soluble epoxy curing agent neutralized and prepared by adopting the organic acid is sensitive to pH value, and the unstability is generated when a basic dye and a filler are used together are solved.

Description

technical field [0001] The invention relates to the technical field of anti-corrosion coatings, in particular to a self-emulsifying water-based epoxy resin curing agent and a preparation method thereof. Background technique [0002] Epoxy resin has excellent metal adhesion, corrosion resistance and excellent physical and chemical properties. It is widely used in the fields of electronics, machinery, construction, aviation and transportation. It is currently the most widely used resin in anti-corrosion coatings. However, with the continuous deterioration of the natural environment and the improvement of people's awareness of environmental protection, as well as the successive promulgation of environmental regulations restricting volatile organic solvents (VOC) in many countries, solvent-based epoxy resin coatings are gradually being favored by people because they contain a large amount of organic solvents. The calls to abandon, reduce or even eliminate organic solvents are ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C08G59/20C09D7/12
Inventor 刘永辉邸建军刘小平李依璇董雪超任建鹏栾莉樊艳达赵金庆何永敬郑超谢静
Owner BEIJING BSS CORROSION PROTECTION IND
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