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an epoxy curing agent

An epoxy curing agent, epoxy technology, applied in the direction of organic chemistry, mercaptan preparation, etc., can solve the problem of paint film performance decline

Active Publication Date: 2021-08-20
SUZUKA INTERNATIONAL (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention embeds the tertiary amine structure into the structure of the mercaptan curing agent to realize the self-catalysis effect of the mercaptan curing agent, and solves the disadvantage that the performance of the paint film is reduced by adding a small molecule accelerator

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] Preparation of mercapto-containing cyclic carbonate: Add 59 parts of glycerol carbonate, 78.8 parts of 3-mercaptopropionic acid, 6.9 parts of p-toluenesulfonic acid, and 30 parts of anhydrous magnesium sulfate into the reaction flask. React at 80°C for 8 hours, wash and dry to obtain mercapto-containing cyclocarbonate.

[0029] Take 4.9 parts of mercapto-containing cyclocarbonate, 1.2 parts of diethylenetriamine, and 3 parts of propylene glycol methyl ether, mix them and heat them in a water bath at 70°C for 8 hours to obtain a diethylenetriamine-based dihydric thiol compound containing a carbamate bond. .

[0030] 6.2 parts of diethylenetriamine-based dihydric mercaptan compound, 3.0 parts of formaldehyde, wait until the temperature in the reaction kettle is no longer changed, and the reaction is completed to obtain a diethylenetriamine-based quick-drying epoxy curing agent.

[0031] Take 0.56 parts of curing agent and 10.23 parts of EPKI 6520-W-53 epoxy emulsion and ...

Embodiment 2

[0033] Take 4.9 parts of mercapto-containing cyclocarbonate in Example 1, 3.5 parts of triethylenetetramine, and 3.5 parts of propylene glycol methyl ether, mix them, and then heat and react in a water bath at 70° C. for 8 hours to obtain a triethylenetetramine-based dihydric mercaptan compound.

[0034] Get 10.48 parts of triethylenetetramine-based dihydric mercaptan compound, 0.9 part of formaldehyde, and react at normal temperature. After the temperature in the reactor is no longer changed, the reaction is completed, and a triethylenetetramine-based quick-drying compound containing a carbamate bond is obtained. type epoxy curing agent.

[0035] Take 1.09 parts of curing agent and 10.23 parts of EPKI 6520-W-53 epoxy emulsion and mix evenly, scrape the film on the tin plate, place it at -24°C, -5°C, room temperature and 60°C to test the curing time and mechanical properties , pour the remaining material on the polytetrafluoroethylene plate to test the opening time

Embodiment 3

[0037] Take 4.9 parts of mercapto-containing cyclocarbonate in Example 1, 2.2 parts of tetraethylenepentamine, and 5 parts of propylene glycol methyl ether, mix them, heat and react in a water bath at 70° C. for 8 hours, and obtain a tetraethylenepentamine-based dihydric mercaptan compound.

[0038]Get 9.1 parts of tetraethylenepentamine-based dihydric mercaptan compound, 1.1 parts of formaldehyde, and react at normal temperature. After the temperature in the reactor is no longer changed, the reaction is completed, and the tetraethylenepentamine-based quick-drying compound containing carbamate bonds is obtained. type epoxy curing agent.

[0039] Take 0.52 parts of curing agent and 10.23 parts of EPKI 6520-W-53 epoxy emulsion and mix evenly, scrape the film on the tin plate, place it at -24°C, -5°C, room temperature and 60°C to test the curing time and mechanical properties , and the remaining material was poured on a polytetrafluoroethylene plate to test the opening time.

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Abstract

The invention relates to a water-based epoxy curing agent for water-based epoxy resin, its preparation method and its use method. The water-based epoxy curing agent uses mercapto and amino groups as curing reaction groups. The structure of the curing agent contains a tertiary amine structure, which can be dispersed or dissolved in water. Compared with the polyamine curing agent, the quick-drying curing agent prepared by the present invention has a shorter curing time. Faster, can achieve low-temperature curing, better impact resistance, and the quick-drying curing agent prepared by the present invention has a faster curing time than the mercaptan curing agent, and at the same time, the hardness, bending and impact resistance of the film are significantly improved.

Description

technical field [0001] The invention relates to a fast-drying epoxy resin low-temperature curing agent characterized by fast reaction speed and low reaction temperature, in particular to a preparation method of mercaptan self-catalyzed epoxy curing agent. Background technique [0002] In addition to the many advantages of solvent-based epoxy resins (such as chemical resistance, good adhesion to many substrates, strong rigidity, heat resistance, wear resistance, etc.), water-based epoxy resins also have environmental protection properties and are organic-free. The advantage of less solvent or volatile organic solvent content, so it is widely used as coatings, adhesives, and beauty joints. In the curing process of water-based epoxy coating, the drying speed of the coating will have a great impact on the improvement of the early hardness and the production efficiency of the assembly line. The drying speed is fast, and the early hardness of the coating will increase quickly, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/66C07D339/06C07C319/12C07C323/25
Inventor 蔡荣聪
Owner SUZUKA INTERNATIONAL (SHANGHAI) CO LTD
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