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Cardanol modified waterborne epoxy curing agent and preparation method thereof

A technology of water-based epoxy and water-based epoxy resin, which is applied in the direction of epoxy resin coatings and coatings, can solve the problems of poor mechanical properties and thermal stability of coating films, and achieve low VOC content, convenient use, good mechanical properties and The effect of water resistance

Active Publication Date: 2019-03-26
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a method for preparing a cardanol-modified water-based epoxy resin curing agent, which solves the problem of poor mechanical properties and thermal stability of the coating film obtained by curing the existing water-based epoxy curing agent

Method used

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  • Cardanol modified waterborne epoxy curing agent and preparation method thereof
  • Cardanol modified waterborne epoxy curing agent and preparation method thereof
  • Cardanol modified waterborne epoxy curing agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: A kind of cardanol modified waterborne epoxy resin curing agent and preparation method thereof

[0034] Prepare cardanol modified water-based epoxy resin curing agent according to the following steps:

[0035] Add 60g (0.2mol) of cardanol, 74g (0.8mol) of epichlorohydrin, 40g (0.4mol) of 40% NaOH aqueous solution, and 0.3g of benzyltriethylammonium chloride into a four-necked flask, and heat up to 70°C. After reacting for 6 hours, vacuum distillation (60°C, -0.09MPa) recovered excess epichlorohydrin and water, and the product was centrifugally filtered to obtain cardanol glycidyl ether (CGE) for use;

[0036] Weigh 40g of PEG400 (0.1mol), 37g (0.4mol) of epichlorohydrin and 0.3g of boron trifluoride diethyl ether in a four-neck flask, heat up to 60°C for 3 hours, add 30g (0.3mol) of 40% NaOH aqueous solution, 60 Continue to react at ℃ for 3 hours, the product is recovered under reduced pressure (60℃, -0.09MPa) to recover excess epichlorohydrin and water, ...

Embodiment 2

[0046] Embodiment 2: A kind of cardanol modified waterborne epoxy resin curing agent and preparation method thereof

[0047]Prepare cardanol modified water-based epoxy resin curing agent according to the following steps:

[0048] Add 60g (0.2mol) of cardanol, 74g (0.8mol) of epichlorohydrin, 42g (0.3mol) of 40% KOH aqueous solution, and 0.4g of tetrabutylammonium bromide into a four-necked flask, raise the temperature to 70°C, and react for 6h Afterwards, vacuum distillation (60°C, -0.09MPa) recovers excess epichlorohydrin and moisture, and the product is centrifugally filtered to obtain cardanol glycidyl ether (CGE) for use;

[0049] Weigh 60g of PEG600 (0.1mol), 37g (0.4mol) of epichlorohydrin and 0.4g of boron trifluoride diethyl ether in a four-neck flask, heat up to 60°C for 3 hours, add 30g (0.3mol) of 40% NaOH aqueous solution, 60 Continue to react at ℃ for 3 hours, the product is recovered under reduced pressure (60℃, -0.09MPa) to recover excess epichlorohydrin and wa...

Embodiment 3

[0051] Embodiment 3: A kind of cardanol modified waterborne epoxy resin curing agent and preparation method thereof

[0052] Prepare cardanol modified water-based epoxy resin curing agent according to the following steps:

[0053] Add 60g (0.2mol) of cardanol, 56g (0.6mol) of epichlorohydrin, 20g (0.2mol) of 40% NaOH aqueous solution, and 0.25g of benzyltriethylammonium chloride into a four-necked flask, and heat up to 70°C. After reacting for 6 hours, vacuum distillation (60°C, -0.09MPa) recovered excess epichlorohydrin and water, and the product was centrifugally filtered to obtain cardanol glycidyl ether (CGE) for use;

[0054] Weigh 20g of PEG400 (0.05mol), 30g of PEG600 (0.05mol), 37g (0.4mol) of epichlorohydrin and 0.2g of boron trifluoride ether in a four-neck flask, heat up to 60°C for 3 hours, add 30g of 40% NaOH aqueous solution (0.3mol), continue to react at 60°C for 3h, recover excess epichlorohydrin and water from the product under reduced pressure (60°C, -0.09MP...

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Abstract

The invention discloses a cardanol modified waterborne epoxy curing agent and a preparation method thereof. The cardanol modified waterborne epoxy curing agent is prepared by taking cardanol and polyethylene glycol as raw materials through the following steps: firstly, synthesizing polyethylene glycol diglycidyl ether and cardanol glycidyl ether respectively; then dropwise adding the polyethyleneglycol diglycidyl ether and fatty amine to react; and adding the cardanol glycidyl ether and carrying out reaction to prepare a product. The epoxy curing agent has water dispersibility and the viscosity is relatively low and is 1000 to 4000mpa.s, so that the epoxy curing agent can be stably stored under the condition that no diluting agent exists and is used for epoxy resin coating. According to the cardanol modified waterborne epoxy curing agent, the raw material cardanol is low in price, is easy to obtain and is a renewable biomass energy source; the structure contains a benzene ring rigid structure and a long-chain hydrocarbonyl substituent group, so that the thermal stability and mechanical properties of an epoxy resin cured product are improved; the curing agent which takes water as adispersion medium is convenient to use and can be constructed on a low-temperature and damp structure to form a film; and the content of VOC (Volatile Organic Compounds) is low and an energy-saving and environment-friendly development concept is met better.

Description

technical field [0001] The invention relates to the technical field of water-based epoxy resin curing agents, in particular to a cardanol-modified water-based epoxy curing agent and a preparation method thereof. Background technique [0002] Due to its excellent adhesion, electrical insulation, thermal stability and mechanical properties, epoxy resin has been widely used in industrial production fields such as coatings, advanced composite materials, engineering plastics, and electronic and electrical materials. Traditional solvent-based epoxy curing agents contain a large amount of organic solvents, resulting in high cost, flammability and toxicity, which seriously pollute the air and endanger human health. [0003] As people's awareness of environmental protection continues to increase, water-based epoxy curing agents that use water as a solvent and dispersant have gradually received attention. Water-based epoxy curing agent is an important part of the water-based epoxy sy...

Claims

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Application Information

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IPC IPC(8): C08G59/50C08G65/333C08G65/331C09D163/00
CPCC08G59/5033C08G65/3315C08G65/33306C09D163/00
Inventor 杨建军王思学吴庆云吴明元张建安刘久逸
Owner ANHUI UNIVERSITY
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