Epoxy curing agent

An epoxy curing agent, epoxy technology, used in organic chemistry, mercaptan preparation and other directions, can solve problems such as the decline of paint film performance, achieve the effects of low VOC, easy dispersion and dissolution, and improved mechanical properties

Active Publication Date: 2019-06-21
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
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of sulfhydryl-containing cyclic carbonate: 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 were added to the reaction flask. Reaction at 80°C for 8 hours, washing and drying to obtain cyclic carbonate containing mercapto group.

[0029] Take 4.9 parts of cyclic carbonate containing mercapto group, 1.2 parts of diethylenetriamine, and 3 parts of propylene glycol methyl ether. After mixing, heat in a water bath at 70°C for 8 hours to obtain a diethylenetriamine-based dibasic mercaptan compound containing urethane bonds. .

[0030] 6.2 parts of diethylenetriamine-based dibasic mercaptan compound and 3.0 parts of formaldehyde, after the temperature in the reactor does not change, the reaction ends, and the diethylenetriamine-based quick-drying epoxy curing agent is obtained.

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

Embodiment 2

[0033] Take 4.9 parts of mercapto group-containing cyclic carbonate, 3.5 parts of triethylenetetramine, and 3.5 parts of propylene glycol methyl ether in Example 1 and mix them and react by heating in a water bath at 70°C for 8 hours to obtain a triethylenetetraamine-based dibasic mercaptan compound.

[0034] Take 10.48 parts of triethylenetetraamine-based dibasic mercaptan compound and 0.9 parts of formaldehyde, and react at room temperature. After the temperature in the reactor does not change, the reaction is completed, and a triethylenetetramine-based quick-drying containing 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 a tinplate, and test the curing time at -24℃, -5℃, room temperature and 60℃, and test the mechanical properties , The remaining material is poured on the Teflon board to test the opening time

Embodiment 3

[0037] Take 4.9 parts of mercapto group-containing cyclic carbonate in Example 1, 2.2 parts of tetraethylenepentamine, and 5 parts of propylene glycol methyl ether. After mixing, the mixture is heated in a water bath at 70°C for 8 hours to obtain a tetraethylenepentamine dibasic mercaptan compound.

[0038] Take 9.1 parts of tetraethylenepentamine-based dibasic mercaptan compound and 1.1 parts of formaldehyde, and react at room temperature. After the temperature in the reactor does not change, the reaction is completed, and the tetraethylenepentamine-based quick-drying containing carbamate bond 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 a tinplate, and test the curing time at -24℃, -5℃, room temperature and 60℃, and test the mechanical properties , The remaining material is poured on the PTFE board to test the opening time.

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Abstract

The invention relates to a waterborne epoxy curing agent for waterborne epoxy resin as well as a preparation method and an application method of the waterborne epoxy curing agent. Mercapto and amino groups are taken as curing reaction groups of the waterborne epoxy curing agent, a curing agent structure comprises a tertiary amine structure which can be dispersed or dissolved in water. Compared with a polyamine curing agent, the prepared quick-drying curing agent is faster in curing and better in impact resistance and can realize low-temperature curing; compared with a thiol curing agent, the prepared quick-drying curing agent is faster in curing, and hardness, bending performance and impact resistance of a film are improved remarkably.

Description

Technical field [0001] The invention relates to a fast-drying epoxy resin low-temperature curing agent with the two major characteristics of fast reaction speed and low reaction temperature, in particular to a preparation method of mercaptan-type autocatalytic 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, abrasion resistance, etc.), water-based epoxy resins also have environmental protection properties and are organic-free It has the advantage of low solvent or volatile organic solvent content, so it is widely used as paint, adhesive, and beautifying agent. During the curing process of waterborne epoxy coatings, the drying speed of the coating will have a great impact on the improvement of early hardness and the production efficiency of the assembly line. The fast drying speed and the rapid increase of the early har...

Claims

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Application Information

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