High-toughness high-activity epoxy resin curing agent and preparation method thereof

An epoxy resin curing and high activity technology, applied in the field of epoxy resin curing agent, can solve the problems of incomplete curing, high brittleness, long gel time, etc., and achieve the effects of shortening the construction period, good impact strength and excellent toughness

Active Publication Date: 2013-10-02
WUHAN KEDA MARBLE PROTECTIVE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The impact strength of the epoxy resin cured product is not high, and the brittleness is large.
[0004] 2. When used in winter, the curing reaction of epoxy resin is not complete
[0006] General polyamide has good toughness, but its viscosity is high, it is difficult to mix with epoxy resin, and the gel time is long in winter, and the curing i

Method used

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  • High-toughness high-activity epoxy resin curing agent and preparation method thereof
  • High-toughness high-activity epoxy resin curing agent and preparation method thereof
  • High-toughness high-activity epoxy resin curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1

[0041] Synthesis steps of high toughness and high activity epoxy resin curing agent:

[0042] 1) Weigh 0.5 mol of ethylene glycol carbonate and 1 mol of tetraethylene pentamine, put ethylene glycol carbonate into the reactor containing tetraethylene pentamine in batches, and control the temperature to react at 50℃±2℃ for 2h;

[0043] 2) Then weigh 0.5mol of thiourea, put it into the reactor in batches, use an oil bath to heat up to make it fully dissolved, and react at 170℃±2℃ for 2 hours;

[0044] 3) After the reaction is completed, the system is cooled to 80°C, and then 2,4,6-tris(dimethylaminomethyl)phenol is added in 1% of the total mass of the product in step 2), stirred evenly, and then discharged and sealed.

Example Embodiment

[0045] Example 2

[0046] Synthesis steps of high toughness and high activity epoxy resin curing agent:

[0047] 1) Weigh 0.1mol of 2,3-butanediol carbonate and 1mol of ethylenediamine, put 2,3-butanediol carbonate into the reactor containing ethylenediamine in batches, and control the temperature at 60 ±2℃ for 0.5h;

[0048] 2) Then weigh 0.6mol of thiourea, put it into the reactor in batches, use an oil bath to heat up to make it fully dissolved, and react at 110℃±2℃ for 5h;

[0049] 3) After the reaction is completed, the system is cooled to 80° C., and then 2-thiol benzothiazole with a total mass of 5% of the product in step 2) is added, and the material is discharged and sealed after stirring evenly.

Example Embodiment

[0050] Example 3

[0051] Synthesis steps of high toughness and high activity epoxy resin curing agent:

[0052] 1) Weigh 1 mol of 1,2-propanediol carbonate and 1 mol of hexamethylenediamine, put 1,2-propanediol carbonate into the reactor containing hexamethylenediamine in batches, and control the temperature to react at 40±2℃ for 1h;

[0053] 2) Then weigh 2.5mol of thiourea, put it into the reactor in batches, use an oil bath to heat up to make it fully dissolved, and react at 150℃±2℃ for 5h;

[0054] 3) After the reaction is completed, the system is cooled to 80°C, and then the benzyl dimethylamine of 0.5% of the total product mass of step 2) is put into the reactor, and the material is discharged and sealed after stirring.

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Abstract

The invention discloses a high-toughness high-activity epoxy resin curing agent and a preparation method of the curing agent. The method comprises the following steps of: weighing cyclic carbonate and polyamine according to the condition that the molar ratio of the cyclic carbonate to the polyamine is (0.1-1):1, feeding the cyclic carbonate into a reactor filled with the polyamine in batches for reaction, weighing thiourea, the molar weight of which is 0.5-2.5 times that of the polyamine, feeding the thiourea into the reactor in batches, reducing the temperature of the system to 80 DEG C after the reaction is finished, adding an accelerant, the mass of which is 0.5-5% of the total mass of the products, into the products, uniformly mixing the accelerant and the products, discharging the mixture and storing the mixture. The curing agent prepared by using the preparation method disclosed by the invention is different from a traditional curing agent in that: the curing agent comprises a polyurethane flexible chain segment synthesized from nonisocyanate, and is excellent in toughness and good in impact resistance; a molecule of the curing agent comprises the polyamine of a thiourea link, which exists in a balanced state with a ketone form and an enol form; the enol compound can rapidly react with an epoxy group so that the epoxy resin can be completely cured in winter and a construction period is effectively shortened.

Description

technical field [0001] The invention relates to the field of epoxy resin curing agents, in particular to a high-toughness and high-activity epoxy resin curing agent and a preparation method thereof. Background technique [0002] After the epoxy resin and curing agent are fully cured, the product has good physical and chemical properties, electrical insulation, low shrinkage, high and low temperature resistance, and excellent wear resistance. Therefore, epoxy resin is widely used in the fields of construction, machinery, electrical and electronic, and aerospace. Most of the general-purpose epoxy resins are bisphenol A type. Affected by the molecular structure of bisphenol A, the epoxy resin curing system has the following defects: [0003] 1. The impact strength of the epoxy resin cured product is not high, and the brittleness is large. [0004] 2. When used in winter, the curing reaction of epoxy resin is not complete. [0005] Therefore, the toughening and winter curing ...

Claims

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Application Information

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IPC IPC(8): C08G59/62
Inventor 杜昆文杜昆武蔡珩王云飞袁婷婷张巍张忠侠
Owner WUHAN KEDA MARBLE PROTECTIVE MATERIALS
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