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Preparation method for modified water-borne epoxy resin curing agent

A water-based epoxy resin and epoxy resin technology, applied in the field of curing agents, can solve the problems of metal parts flash rust, coating film performance degradation, and easy instability, etc., to achieve strong alkali resistance, good mechanical properties and durability Sex, good flexibility effect

Inactive Publication Date: 2017-10-24
常州兆威不锈钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: the organic acid in the ionic water-based epoxy resin curing agent causes the performance of the coating film to decrease, and it is easy to produce flash rust when applied to metal parts, causing pollution to the environment, and it can be used together with alkaline fillers. When used, the problem of unstable phenomenon is prone to occur, and a preparation method of a modified water-based epoxy resin curing agent is provided.

Method used

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  • Preparation method for modified water-borne epoxy resin curing agent

Examples

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example 1

[0014] Weigh 20g of regenerated cellulose fibers, add 300mL of 10% sodium hydroxide solution, stir at 300r / min for 1h, let it stand for activation for 20h, then filter, wash the filter residue with deionized water until the washing liquid is neutral, Then put the filter residue in a drying oven and dry at 50°C for 3 hours to obtain activated regenerated cellulose fibers. Weigh 3 g of activated regenerated cellulose fibers, grind them in a mortar, pass through a 400-mesh sieve, and mix them with 595 mL of three Put ethylene tetramine into a four-necked flask, and disperse it with a 300W ultrasonic wave for 3 hours, and then add 155 mL of ethylene glycol diglycidyl ether dropwise at 1 mL / min under a constant temperature water bath at 60 ° C. After the addition is completed, keep the temperature and Stir and react at 300r / min for 3h to obtain a pre-reaction solution, then add 185mL of bisphenol A epoxy resin E-51 dropwise at 1mL / min to the pre-reaction solution under continuous st...

example 2

[0017] Weigh 25g of regenerated cellulose fibers, add 325mL of 10% sodium hydroxide solution, stir at 350r / min for 1h, let it stand for activation for 22h, then filter, wash the filter residue with deionized water until the washing liquid is neutral, Then put the filter residue in a drying oven and dry at 55°C for 4 hours to obtain activated regenerated cellulose fibers. Weigh 4 g of activated regenerated cellulose fibers, grind them in a mortar, pass through a 400-mesh sieve, and mix them with 598 mL of three Put ethylene tetramine into a four-necked flask, and use 300W ultrasonic wave to ultrasonically disperse for 3 hours, then add 158mL of ethylene glycol diglycidyl ether dropwise at 1mL / min under a constant temperature water bath at 63°C. After the dropwise addition is completed, keep the temperature and Stir and react at 350r / min for 4h to obtain a pre-reaction solution, and then add 197mL of bisphenol A epoxy resin E-44 dropwise at 1mL / min to the pre-reaction solution un...

example 3

[0020] Weigh 30g of regenerated cellulose fibers, add 350mL of 10% sodium hydroxide solution, stir at 400r / min for 2h, let it stand for activation for 24h, then filter, wash the filter residue with deionized water until the washing liquid is neutral, Then put the filter residue in a drying oven and dry at 60°C for 5 hours to obtain activated regenerated cellulose fibers. Weigh 5 g of activated regenerated cellulose fibers, grind them in a mortar, pass through a 400-mesh sieve, and mix them with 600 mL of three Put ethylene tetramine into a four-necked flask, and disperse it with a 300W ultrasonic wave for 4 hours, and then add 160 mL of ethylene glycol diglycidyl ether dropwise at 2 mL / min under a constant temperature water bath at 65 ° C. After the addition is completed, keep the temperature and Stir and react at 400r / min for 5h to obtain a pre-reaction solution, and then add 210mL of bisphenol A epoxy resin E-20 dropwise at 2mL / min to the pre-reaction solution under continuou...

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Abstract

The invention discloses a preparation method for a modified water-borne epoxy resin curing agent and belongs to the technical field of a curing agent. The method comprises the following steps: firstly, using a sodium hydroxide solution for activating a regenerated cellulose fiber; grinding and then bonding with triethylene tetramine and performing addition reaction with ethylene glycol diglycidyl ether; adopting epoxy resin for performing chain extension; lastly, using phenyl glycidyl ether for blocking the terminal, thereby acquiring the modified water-borne epoxy resin curing agent. The modified water-borne epoxy resin curing agent acquired according to the invention has excellent mechanical properties and durability, is non-toxic and harmless, is free from volatile organic solvent, is pollution-free to ecological environment, is free from organic acid, is impossible to corrode metal parts, is high in alkali resistance, is free from instable phenomenon under the condition of use together with alkaline filler and is non-irritant to the skin of the user.

Description

technical field [0001] The invention discloses a preparation method of a modified water-based epoxy resin curing agent, which belongs to the technical field of curing agents. Background technique [0002] Epoxy resin has excellent adhesion, radiation resistance, thermal stability, acid and alkali resistance, insulation and mechanical strength, and is widely used in various fields such as coatings, adhesives and composite materials. However, epoxy resin is an amorphous viscous liquid, which is plastic when heated, has no obvious melting point, becomes soft and gradually melts and becomes sticky when heated, is insoluble in water, and will not harden itself, so it has almost no independent use value. Only when the curing agent reacts to form an infusible polymer with a three-dimensional network structure can it be applied. When a certain amount of curing agent is added, it will gradually solidify to form chemical substances with different properties. Therefore, it is necessar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C08G81/00
CPCC08G59/5013C08G81/00
Inventor 尚秋彤杨阳李雪晴
Owner 常州兆威不锈钢有限公司
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