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Preparation method and application of cardanol-based waterborne epoxy resin curing agent

A water-based epoxy resin, cardanol-based technology, applied in the direction of epoxy resin coatings, coatings, etc., can solve the problems of increasing energy consumption and environmental protection pressure, and achieve the reduction of environmental protection pressure, good compatibility and good stability Effect

Inactive Publication Date: 2020-03-31
岳阳中展科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process ratio, the amine is relatively excessive, and an organic solvent is added during the reaction process. After the reaction is completed, the excess amine and solvent must be removed, which increases energy consumption and environmental protection pressure.

Method used

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  • Preparation method and application of cardanol-based waterborne epoxy resin curing agent
  • Preparation method and application of cardanol-based waterborne epoxy resin curing agent
  • Preparation method and application of cardanol-based waterborne epoxy resin curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment includes the following steps:

[0031] (1) Put 160g of PPG4000 (polypropylene glycol 4000) and 15.2g of epoxy resin E51 (epoxy equivalent 190) into a 500mL glass reactor with reflux condenser and automatic temperature control, heat and melt, start stirring, and mix well , heated up to 100°C, and kept at a constant temperature, 1mL of boron trifluoride ether solution (46.5% by mass) was added within 3 hours, and then reacted at constant temperature for 1 hour, and then cooled to 65°C to obtain an emulsified epoxy functional group agent;

[0032] (2) Put 60g of ethylenediamine and 300g of cardanol into a 1000mL glass reactor with a reflux condenser and automatic temperature control, stir and mix evenly, heat up to 80°C, and add 31g of solid formaldehyde in batches to control The reaction temperature does not exceed 90°C, and then reacts at a constant temperature for 2 hours, vacuumizes and dehydrates for 1 hour (by mass, the water content is less than 2.5...

Embodiment 2

[0038] This embodiment includes the following steps:

[0039] (1) Put 128g PEG4000 and 12.2g E51 epoxy resin (epoxy equivalent 190) into a 500mL glass reactor with reflux condenser and automatic temperature control, heat and melt, start stirring, mix well, and heat up to 100 ℃, and keep the constant temperature, add 0.85mL boron trifluoride ether solution (46.5% by mass) within 3 hours, and then react at constant temperature for 1 hour. Cool to 65 DEG C then, obtain epoxy functional group emulsifier;

[0040] (2) In a 1000mL glass reactor with a reflux condenser and automatic temperature control, put 100g of diethylenetriamine and 240g of cardanol respectively, stir and mix evenly, heat up to 80°C, and put in 30g of solid formaldehyde in batches , control the reaction temperature not to exceed 90°C, then react at a constant temperature for 2 hours, vacuumize and dehydrate for 1 hour (by mass, the water content is lower than 2.5%), and cool to 60°C to obtain the cardanol modif...

Embodiment 3

[0043] This embodiment includes the following steps:

[0044] (1) Put 128g PEG2000 and 28.2g E44 epoxy resin (epoxy equivalent weight 220) into a 500mL glass reactor with reflux condenser and automatic temperature control, heat and melt, start stirring, mix well, and heat up to 100°C , and keep a constant temperature, drop into 0.8mL boron trifluoride ether solution (mass percentage is 46.5%) within 3 hours, then react at a constant temperature for 1 hour, then cool to 65°C to obtain an epoxy functional group emulsifier;

[0045](2) Put 24g of ethylenediamine, 40g of diethylenetriamine, and 240g of cardanol into a 1000ml glass reactor with reflux condenser and automatic temperature control, stir and mix evenly, heat up to 80°C, and divide into batches Put in 25g of solid formaldehyde once, control the reaction temperature not to exceed 90°C, then react at constant temperature for 2 hours, vacuumize and dehydrate for 1 hour (by mass, the water content is less than 2.5%), cool t...

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Abstract

The invention discloses a preparation method and application of a cardanol-based waterborne epoxy resin curing agent. The preparation method comprises the following steps: (1) mixing an epoxy resin and a polyether polyol, heating for melting, adding a catalyst at 50-100 DEG C, and carrying out condensation reaction to obtain an epoxy functional group emulsifier after the reaction is finished; (2)carrying out Mannich reaction on cardanol, a polyamine and formaldehyde to obtain a cardanol modified curing agent; and (3) adding the epoxy functional group emulsifier obtained in the step (1) into the cardanol modified curing agent obtained in the step (2), heating to 60-80 DEG C, and reacting to obtain the cardanol-based waterborne epoxy resin curing agent. The cardanol-based waterborne epoxy resin curing agent prepared by the preparation method disclosed by the invention is insensitive to the pH value and good in stability; the process is simple, amine does not need to be excessive, no organic solvent is added, and energy conservation and environmental protection are achieved.

Description

technical field [0001] The invention belongs to the field of curing agents for water-based epoxy resins, and in particular relates to a preparation method and application of a cardanol-based water-based epoxy resin curing agent. Background technique [0002] Water-based epoxy coatings are one of the most important varieties of water-based industrial paints, widely used in floor coating materials, containers, ships, railways, building steel structures and other industrial fields that require extremely high wear resistance and corrosion resistance. [0003] The film-forming substance of waterborne epoxy coatings is composed of resin and curing agent, and the performance of curing agent plays an important role in the final performance of the coating film. The development of curing agents with different performance characteristics can promote the application of epoxy coatings in various industrial fields. [0004] At present, most of the water-based epoxy curing agents in the m...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08G59/62C09D163/00
CPCC08G59/62C08G81/00C09D163/00
Inventor 刘慧森余志良孟勇
Owner 岳阳中展科技有限公司
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