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Modified waterborne epoxy resin curing agent and preparation method thereof

A technology of water-based epoxy resin and curing agent, applied in the direction of epoxy resin coating, coating, etc., can solve the problem of high viscosity, achieve the effect of mild reaction, good dispersion and emulsification performance, and convenient operation

Active Publication Date: 2019-09-13
上海骁鹏新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems existing in the current prior art, the present invention is to solve the disadvantages of high viscosity in the preparation of water-based epoxy curing agents in the prior art, provide a water-based epoxy curing agent emulsion that is easy to prepare and has low viscosity, and provides A curing agent for modified water-based epoxy resin that is easy to prepare, can improve the stability of water-based epoxy curing agent emulsion, and is easy to scale production, and a preparation method thereof

Method used

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  • Modified waterborne epoxy resin curing agent and preparation method thereof
  • Modified waterborne epoxy resin curing agent and preparation method thereof
  • Modified waterborne epoxy resin curing agent and preparation method thereof

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preparation example Construction

[0068] The present invention also provides a kind of preparation method of curing agent for modified water-based epoxy resin as described above, comprising the following steps:

[0069] Step 1: reacting diisocyanate with polyethylene glycol monomethyl ether to obtain a reaction product I containing a urethane intermediate product A containing an isocyanate group at one end and a methoxy group at one end;

[0070] Step 2: The reaction product I obtained in step 1 contains enough remaining isocyanate groups to react with aliphatic polyamines to obtain a reaction product II containing a urea intermediate product B containing a methoxy group at one end and a primary amine group at one end;

[0071] Step 3: The amount of primary amino groups contained in the reaction product II obtained in step 2 is sufficient to react with the monofunctional epoxy reactive diluent to obtain the curing agent for the modified water-based epoxy resin containing an alcohol amine product.

[0072] The ...

Embodiment 1

[0095] Step 1: Add 10g of isophorone diisocyanate (IPDI) into a 500mL four-neck flask with a thermometer and a condenser tube, raise the temperature to 30°C under nitrogen protection, and start the stirrer; A total of 33.78 g of polyethylene glycol monomethyl ether MPEG750, which had been dehydrated, was reacted for 1 hour; a reaction product I containing a urethane intermediate product A containing an isocyanate group at one end and a methoxyl group at one end was obtained;

[0096] Step 2: Add 8.51g of tetraethylenepentamine to the flask, slowly add the reaction product I obtained in step 1 to the flask dropwise, after the addition, slowly raise the temperature to 50°C and continue the reaction for 2h, and obtain Methoxyl group, reaction product II of urea intermediate product B containing primary amino group at one end;

[0097] Step 3: Add a monofunctional reactive diluent to the flask: 34.62g C12-14 alkyl glycidyl ether, slowly add the above-mentioned reaction product II ...

Embodiment 2

[0102] Step 1: Add 10g of isophorone diisocyanate (IPDI) into a 500mL four-necked flask with a thermometer and a condenser tube, raise the temperature to 40°C under nitrogen protection, and start the stirrer; A total of 54 g of polyethylene glycol monomethyl ether MPEG1200, which had been dehydrated, was reacted for 1 hour; a reaction product I containing a urethane intermediate product A containing an isocyanate group at one end and a methoxyl group at one end was obtained;

[0103] Step 2: Add 8.51g of tetraethylenepentamine to the flask, slowly add the reaction product I obtained in step 1 to the flask dropwise, after the dropwise addition, slowly raise the temperature to 70°C to continue the reaction for 2h, and obtain Methoxyl group, reaction product II of urea intermediate product B containing primary amino group at one end;

[0104] Step 3: Add monofunctional reactive diluent to the flask: 34.62g C12-14 alkyl glycidyl ether, slowly add the above-mentioned reaction produ...

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Abstract

The invention provides a modified waterborne epoxy resin curing agent and a preparation method thereof. The modified waterborne epoxy resin curing agent is alcamines curing agent including a carbamateunit and a carbamide unit, and is prepared from raw materials including the following substances: diisocyanate, polyethylene glycol monomethyl ether, fatty polyamine and a monofunctional epoxy reactive diluents. According to the preparation method of the modified waterborne epoxy resin curing agent, the preparation route is short, reaction is mild, viscosity is low, and pressure reaction equipment is not required. Thereby, the preparation method has advantages of simple preparation process, simple operation and mild reaction condition, is suitable for industrial production, and can be widelyapplied to preparation of a protective coating for aircrafts, ships, buildings, traffic and various kinds of mechanical equipment.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a curing agent for modified water-based epoxy resin. Background technique [0002] Epoxy resin refers to a polymer prepolymer containing two or more epoxy groups, with aliphatic, alicyclic or aromatic segments as the main chain, because of its excellent substrate adhesion, heat resistance, Corrosion resistance and other properties are widely used in two-component epoxy anti-corrosion coatings. Solvent-based epoxy coatings contain organic volatiles such as toluene, xylene, and even benzene and formaldehyde, which seriously endanger the ecological environment and human health. Therefore, the development of water-based epoxy coatings that use water instead of organic solvents is an inevitable trend in the development of the coatings industry today. The water-based epoxy curing agent is an important part of the water-based epoxy coating, which plays a decisive ...

Claims

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Application Information

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IPC IPC(8): C08G59/50C08G65/333C09D163/00
CPCC08G59/504C08G65/33306C08G65/33355C09D163/00
Inventor 陈洪英
Owner 上海骁鹏新材料科技有限公司
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