Emulsion type epoxy curing agent and preparation method thereof

An epoxy curing agent, emulsion type technology, applied in epoxy resin coatings, coatings, etc., can solve the problems of reducing the water resistance, corrosion resistance and instability of the coating film, achieve fast drying speed, easy room temperature curing, Simple preparation method

Active Publication Date: 2021-02-09
上海华谊涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although ionic water-based epoxy curing agents have achieved good applications in coatings, adhesives and other industries, ionic water-based epoxy curing agents are easily affected by the pH of the environment during the curing process. For example, it is easy to use with alkaline fillers. Instability occurs, and the organic acid added in the salt-forming process will reduce the water resistance and corrosion resistance of the coating film. Therefore, the development and use of non-ionic water-based epoxy curing agents has broad prospects

Method used

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  • Emulsion type epoxy curing agent and preparation method thereof
  • Emulsion type epoxy curing agent and preparation method thereof
  • Emulsion type epoxy curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Synthesis of emulsion type epoxy curing agent:

[0032] Step 1: Under nitrogen protection, add 54g of monofunctional polyetheramine (Hunsman M-1000) with a molecular weight of 1000 to a 500mL three-necked flask, add 246g of liquid epoxy resin E54, raise the temperature to 90°C, and start the stirring reaction After 2h, a yellow and transparent intermediate product can be obtained.

[0033] Step 2: Add 50 g of DMDC into a 500 mL three-necked flask, then slowly add 70 g of the above-mentioned intermediate product into the flask, and stir and react at 60° C. for 6 h.

[0034] Step 3: Add 3g of C 12 -C 14 Alkyl glycidyl ether was added to the above reaction, and the reaction was stirred at 60°C for 2h.

[0035] Step 4: Add 110g of deionized water dropwise into the flask under high-speed stirring, control the emulsification temperature at 50°C, and rotate at 1000r / min, stir and disperse to obtain the milky white target emulsion-type epoxy curing agent.

[0036] The perfo...

Embodiment 2

[0040] Synthesis of emulsion type epoxy curing agent:

[0041] Step 1: Under nitrogen protection, add 60g of difunctional polyetheramine (ED-600) with a molecular weight of 600 to a 500mL three-necked flask, add 240g of liquid epoxy resin E54, heat up to 125°C, and start stirring for 3.5 hours. A yellow transparent intermediate was obtained.

[0042] Step 2: Add 6g of TETA and 30g of MXDA into a 500mL three-necked flask, then slowly add 80g of the above-mentioned intermediate product into the flask, and stir and react at 60°C for 5h.

[0043] The third step: 5 g of C12-C14 alkyl glycidyl ether was added, and stirred and reacted at 80° C. for 2 h.

[0044] Step 4: Add 121g of deionized water dropwise into the flask under high-speed stirring, control the emulsification temperature at 60°C, and rotate at 1000r / min, stir and disperse to obtain the milky white target emulsion-type epoxy curing agent.

[0045] The performance parameters of the products prepared in this embodiment ...

Embodiment 3

[0049] Synthesis of emulsion type epoxy curing agent:

[0050] Step 1: Under nitrogen protection, add 62g of monofunctional polyetheramine (Hunsman M-2070) with a molecular weight of 2000 to a 500mL three-necked flask, add 238g of liquid epoxy resin E51, raise the temperature to 150°C, and start the stirring reaction After 4h, a yellow and transparent intermediate product can be obtained.

[0051] Step 2: Add 30g of IPDA and 10g of PACM into a 500mL three-neck flask, then slowly add 70g of the above-mentioned intermediate product into the flask, and stir and react at 60°C for 5h.

[0052] The third step: 3g of butyl glycidyl ether (C 7 h 14 o 2 ) was added, and the reaction was stirred at 60°C for 2h.

[0053] Step 4: Add 90g of deionized water dropwise into the flask under high-speed stirring, control the emulsification temperature at 70°C, and rotate at 1500r / min, stir and disperse to obtain the milky white target emulsion-type epoxy curing agent.

[0054] The performan...

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Abstract

The invention provides a quick-drying emulsion type epoxy curing agent and a preparation method thereof. According to the preparation method, polyether amine with certain hydrophilicity reacts with excessive epoxy resin to form an amphiphilic prepolymer; and residual epoxy groups continuously reacts with proper excessive micromolecular polyamine due to the fact that the epoxy groups are greatly excessive, and therefore, an emulsion type epoxy curing agent with certain active hydrogen content can be formed; due to the existence of unreacted primary amine in the polyamine, the working life of the curing agent is shortened, so that the monofunctional epoxy compound is subsequently added to block the primary amine; and finally, water is added for emulsification, so that the emulsion type epoxycuring agent can be obtained. The synthesis method of the emulsion type epoxy curing agent is simple; a catalyst and a solvent do not need to be added; the raw materials are easy to obtain; the VOC content is zero; the application range of the emulsion type epoxy curing agent is wide; a paint film prepared from the emulsion type epoxy curing agent is high in surface drying speed, and related mechanical properties, salt spray resistance and other properties of the paint film are excellent; and therefore the emulsion type epoxy curing agent has a great industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an emulsion-type epoxy curing agent and a preparation method thereof. Background technique [0002] Compared with solvent-based coatings, water-based epoxy coatings have the advantages of less volatile gas, convenient sources, non-toxicity, and non-flammability. It has become one of the main development directions of coatings in the future, and epoxy resin has strong adhesion and good corrosion resistance. , are widely used in the preparation of water-based anti-corrosion coatings. Waterborne epoxy curing agent is an important part of waterborne epoxy coatings, and its composition and structure directly affect the physical and chemical properties of the coating film. At present, water-based epoxy curing agents are mainly divided into two types: ionic and non-ionic. [0003] Although ionic water-based epoxy curing agents have achieved good applications in c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C09D163/00
CPCC08G59/504C08G59/5026C08G59/5006C08G59/5033C09D163/00Y02E60/10
Inventor 段华李小林刘逸昕
Owner 上海华谊涂料有限公司
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