A kind of cardanol modified water-based epoxy curing agent and preparation method thereof

A technology of water-based epoxy and water-based epoxy resin, applied in epoxy resin coatings, coatings, etc., can solve the problems of poor mechanical properties and thermal stability of coating films, achieve low VOC content, low synthesis temperature, and good impact resistance sexual effect

Active Publication Date: 2021-01-01
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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  • A kind of cardanol modified water-based epoxy curing agent and preparation method thereof
  • A kind of cardanol modified water-based epoxy curing agent and preparation method thereof
  • A kind of cardanol modified water-based epoxy curing agent and preparation method thereof

Examples

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 water-based epoxy curing agent and a preparation method thereof. Using cardanol and polyethylene glycol as raw materials, polyethylene glycol diglycidyl ether and cardanol glycidyl ether are first synthesized respectively. Then, polyethylene glycol diglycidyl ether and aliphatic amine were dripped and reacted, and then cardanol glycidyl ether was added for further reaction to prepare a cardanol-modified water-based epoxy resin curing agent. The epoxy curing agent is water-dispersible and has a low viscosity of 1000-4000mpa.s, so it can be stored stably without diluent and used for epoxy resin coatings. The raw material cardanol used in the present invention is cheap and easy to obtain as renewable biomass energy. The structure contains a benzene ring rigid structure and a long-chain hydrocarbon substituent, which improves the thermal stability and mechanical properties of the epoxy resin cured product. Water is used as the dispersion medium The high-quality curing agent is easy to use, and can be applied to form a film on a low-temperature, humid surface. The VOC content is low, which is more in line with the development concept of energy saving and environmental protection.

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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Patent Type & Authority Patents(China)
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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