Preparation method of non-ionic waterborne epoxy curing agent

A water-based epoxy, non-ionic technology, applied in the field of fine chemicals, can solve the problems of difficult preparation of non-ionic water-based epoxy curing agent, poor performance of water-based epoxy resin system, etc., achieve excellent application effect, improve metal Anti-corrosion performance, the effect of improving the anti-corrosion effect

Inactive Publication Date: 2019-01-08
莫锐彬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the above-mentioned technologies, the purpose of the present invention is to overcome the technical problems such as the poor performance of the current water-based epoxy resin system in metal anti-corrosion engineering, and the difficulty in preparing non-ionic water-based epoxy curing agents, and provide a non-ionic The preparation method of waterborne epoxy curing agent

Method used

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Examples

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Embodiment 1

[0022] A preparation method of nonionic water-based epoxy curing agent, the steps are as follows:

[0023] (1) Preparation of amino-terminated prepolymer: Add 21.9g of triethylenetetramine into the reactor, stir and heat to 70°C, then drop 18.5g of epoxy resin E-54 into the reactor within 2 hours Reaction, after the dropwise addition is completed, keep warm for 1 hour to obtain an amino-terminated prepolymer;

[0024] (2) Preparation of aldehyde group capping agent: mix 30g of styrene phenol polyoxyethylene ether (10) with 0.15g of PdCl 2 -CuCl 2 Mix and heat to 100°C, feed oxygen at a ventilation rate of 0.4mL / g min, and react for 4 hours to prepare benzaldehyde phenol polyoxyethylene ether;

[0025] (3) Capping reaction: Mix and heat the products of the above two steps to 85°C, react for 2 hours, then cool to 60°C, slowly add 47g of water, cool to room temperature after adding water, and obtain a clear viscous liquid, obtained Non-ionic water-based epoxy curing agent.

Embodiment 2

[0027] A preparation method of nonionic water-based epoxy curing agent, the steps are as follows:

[0028] (1) Preparation of amino-terminated prepolymer: Add 29.2g of triethylenetetramine into the reactor, stir and heat to 70°C, then add 19.6g of epoxy resin E-51 dropwise into the reactor within 2 hours Reaction, after the dropwise addition is completed, keep warm for 1 hour to obtain an amino-terminated prepolymer;

[0029] (2) Preparation of aldehyde group capping agent: mix 60g of styrene phenol polyoxyethylene ether (10) with 0.3g of PdCl 2 -CuCl 2 Mix and heat to 100°C, feed oxygen at a ventilation rate of 0.5mL / g min, and react for 4 hours to prepare benzaldehyde phenol polyoxyethylene ether;

[0030] (3) Capping reaction: Mix and heat the products of the above two steps to 85°C, react for 2 hours, then cool to 60°C, slowly add 80.5g of water, cool to room temperature after adding water, and obtain a clear viscous liquid. Obtain non-ionic water-based epoxy curing age...

Embodiment 3

[0032] A preparation method of nonionic water-based epoxy curing agent, the steps are as follows:

[0033] (1) Preparation of amino-terminated prepolymer: Add 20.6g of diethylenetriamine into the reactor, stir and heat to 70°C, then drop 22.7g of epoxy resin E-44 into the reactor within 3 hours Reaction, after the dropwise addition is completed, keep warm for 1 hour to obtain an amino-terminated prepolymer;

[0034] (2) Preparation of aldehyde-blocking agent: mix 100g of styrene phenol polyoxyethylene ether (20) with 0.5g of PdCl 2 -CuCl 2 Mix and heat to 100°C, feed oxygen at a ventilation rate of 0.5mL / g min, and react for 4 hours to prepare benzaldehyde phenol polyoxyethylene ether;

[0035] (3) Capping reaction: Mix and heat the products of the above two steps to 85°C, react for 3 hours, then cool to 60°C, slowly add 95.5g of water, cool to room temperature after adding water, and obtain a clear viscous liquid. Obtain non-ionic water-based epoxy curing agent.

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Abstract

The invention discloses a preparation method of a non-ionic waterborne epoxy curing agent. The method comprises the following steps: firstly, reacting epoxy resin with aliphatic polyamine to obtain anamino-terminated oligomer; then carrying out catalytic oxidation on styrene phenol polyoxyethylene ether to obtain an aldehyde-based compound served as an end capping reagent; finally, adding the endcapping reagent for carrying out end capping on residual primary amine to obtain the non-ionic waterborne epoxy curing agent. The curing agent prepared by the method disclosed by the invention has aSchiff base structure, so that the effect of an epoxy system in metal corrosion protection can be greatly improved; meanwhile, the end capping method disclosed by the invention has the selectivity ofthe primary amine, and more secondary amines can be retained so as to obtain a better curing density and potlife of the epoxy system; the non-ionic waterborne epoxy curing agent has good application effects in waterborne metal anti-corrosion coatings and waterborne epoxy building material systems.

Description

technical field [0001] The invention relates to the technical field of fine chemicals, and relates to a non-ionic water-based epoxy curing agent, in particular to a preparation method of a non-ionic water-based epoxy curing agent. Background technique [0002] Epoxy resin is a type of polymer with multiple epoxy groups. Due to the low molecular weight of most epoxy resins, the application range of single-component use is small and the application value is low, so it needs to be used in combination with a curing agent. In order to obtain excellent mechanical properties. The two-component epoxy resin has excellent mechanical properties, electrical properties, chemical resistance, and has the advantages of easy construction and low curing shrinkage. It is currently widely used in metal coatings, architectural coatings, civil engineering composite materials, and electronics industries. and automotive industry painting and other fields. At present, with the further tightening o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C08G59/62
CPCC08G59/5006C08G59/5013C08G59/621
Inventor 莫锐彬莫其惠
Owner 莫锐彬
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