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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 is not complete, which limits the use of epoxy resin in winter
[0007] Ordinary modified amines, such as the Chinese invention patent with publication number CN102604044A, disclose a thiourea modified low-temperature curing agent and a preparation method thereof. The toughness of the cured product is poor, which restricts the application of epoxy resin

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 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 tetraethylenepentamine, put the ethylene glycol carbonate into the reactor filled with tetraethylenepentamine in batches, and control the temperature at 50°C±2°C for 2 hours;

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

[0044] 3) After the reaction is completed, cool down the system to 80°C, and then add 1% of the total mass of the product in step 2) of 2,4,6-tris(dimethylaminomethyl)phenol, stir evenly, and discharge the material for storage.

Embodiment 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 the 2,3-butanediol carbonate into the reactor filled with ethylenediamine in batches, and control the temperature at 60 Reaction at ±2°C for 0.5h;

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

[0049] 3) After the reaction is completed, cool the system down to 80°C, and then add 2-mercaptobenzothiazole with 5% of the total mass of the product in step 2), stir evenly, and then discharge and seal.

Embodiment 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 the 1,2-propylene glycol carbonate into the reactor containing hexamethylenediamine in batches, and control the temperature at 40±2°C for 1 hour;

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

[0054] 3) After the reaction is completed, lower the temperature of the system to 80°C, and then add 0.5% benzyldimethylamine of the total mass of the product in step 2) into the reactor, stir evenly, and discharge the material for storage.

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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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