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Active epoxy toughening-curing agent, and its preparing method

A curing agent and epoxy technology, used in the field of thermosetting resin curing, can solve the problems of high curing temperature and decreased resin tensile strength

Inactive Publication Date: 2007-06-13
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the curing agent content reaches 40%, the impact strength of the cured resin reaches a peak value of 23kJ m -1 , the toughness is very good, but the curing temperature is too high (higher than 120 ℃), and the tensile strength of the resin decreases with the increase of the curing agent content

Method used

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  • Active epoxy toughening-curing agent, and its preparing method
  • Active epoxy toughening-curing agent, and its preparing method
  • Active epoxy toughening-curing agent, and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] step 1:

[0022] Mix 44g of nonylphenol, 2.52g of tetraethylammonium bromide, and 200ml of 15% NaOH solution and heat to 70°C, add 20.2g of 1,3-dibromopropane, continue heating to 90°C, mechanically stir for 5h, stop Heat, continue stirring to room temperature, add 50ml of diethyl ether for extraction, wash the organic phase with saturated brine until neutral, dry over anhydrous sodium sulfate, and remove the solvent under reduced pressure to obtain 40.2g of the product with a yield of 84.6%.

[0023] Step 2:

[0024] Dissolve 4.87 g of the product of the above steps in 10 ml THF, add 10.2 g of 37% nitric acid dropwise into the system, control the temperature at 50 ° C, monitor with TLC, stir mechanically, react for 4 h, remove THF under reduced pressure, and extract with ether; Wash with brine until neutral, dry over anhydrous sodium sulfate, and remove the solvent under reduced pressure to obtain 2.45 g of product with a yield of 37.1%.

[0025] Step 3:

[0026] Mi...

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Abstract

This invention involves a aromatic amine epoxy curing agent and its preparation. The curing agent takes the nonylphenol and dibromo substitute hydrocarbon as raw materials. After coupling, nitration, reduction to obtain. Not add any toughening agent circumstances, impact toughness of curing product risen 30% than ordinary aromatic amine curing agent, also molecule contains more amid, making the curing agent activity, in the medium temperature (60-100 C degree) curing resins, made up the shortcomings of high curing temperature of aromatic amine curing agent.

Description

technical field [0001] The invention belongs to the technical field of thermosetting resin curing. It specifically involves the research on the synthesis method and curing process of medium and low temperature curing agent and toughening agent of epoxy resin. Background technique [0002] Epoxy resins are a class of thermosetting resins that are widely used. With the advancement of science and technology, all walks of life have put forward higher requirements on the performance of epoxy resin, especially the curing temperature. This is mainly because curing epoxy resin at medium temperature (60-100°C) or room temperature can greatly reduce the shrinkage thermal stress and curing residual stress of the cured resin, thereby improving the mechanical properties of the resin. In addition, medium and low temperature curing is easy to operate, has a high safety factor, and has advantages in usability. Low-temperature epoxy curing agents are mainly based on aliphatic amines or lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C07C211/51
Inventor 杨洋陈功
Owner BEIHANG UNIV
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