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Tough mannich base curing agent and preparation thereof

A Mannich base and curing agent technology, applied in the field of curing agent, can solve the problems of difficult source of raw materials, insufficient flexibility, unsatisfactory water resistance and seawater resistance, etc., achieve good development prospects, improve adhesion and adhesion Relay effect

Inactive Publication Date: 2009-01-21
CHENGUANG RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned modified design also has problems such as difficult source of raw materials, high price, high product cost, short service life, insufficient flexibility, unsatisfactory water resistance and seawater resistance, long and complicated process, and a large amount of "three wastes" etc.

Method used

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  • Tough mannich base curing agent and preparation thereof
  • Tough mannich base curing agent and preparation thereof
  • Tough mannich base curing agent and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 (small test synthetic example)

[0041] Add 200g of nonylphenol, 120g of tung oil, and 1.0g of p-toluenesulfonic acid to a 2000ml four-neck flask equipped with a stirrer, electric heating mantle, dropping device, condenser and thermometer, and control the system temperature at 95°C to maintain the reaction 1.0h. The temperature of the system was controlled at 50°C, and 180 g of ethylenediamine was added dropwise for 1.5 hours. After the dropwise addition is completed, the temperature of the system is controlled at 50° C., and 380 g of formaldehyde is started to be added dropwise for 1.5 hours. Heat the material, control the temperature at 100°C, and react for 2.0 hours. The system was heated up and dehydrated under normal pressure and reduced pressure. Cool the material, that is, add 30g of ethanol, stir evenly, and obtain the finished product.

[0042]The technical indicators of the finished product are: amine value (mgKOH / g): 500; viscosity (25°C, mPa...

Embodiment 2

[0049] Add 200g of phenol, 120g of tung oil, and 1.0g of p-toluenesulfonic acid to a 2000ml four-neck flask equipped with a stirrer, electric heating mantle, dropping device, condenser and thermometer. Control the system temperature at 95°C and maintain the reaction for 1.0h . The temperature of the system was controlled at 50°C, and 180 g of ethylenediamine was added dropwise for 1.5 hours. After the dropwise addition is completed, the temperature of the system is controlled at 50° C., and 380 g of formaldehyde is started to be added dropwise for 1.5 hours. Heat the material, control the temperature at 100°C, and react for 2.0 hours. The system was heated up and dehydrated under normal pressure and reduced pressure. Cool the material, that is, add 30g of ethanol, stir evenly, and obtain the finished product.

[0050] The technical indicators of the finished product are: amine value (mgKOH / g): 490; viscosity (25°C, mPa.s): 1600; appearance: reddish-brown transparent viscous...

Embodiment 3

[0052] Add 200g of nonylphenol, 120g of tung oil, and 1.0g of p-toluenesulfonic acid to a 2000ml four-neck flask equipped with a stirrer, electric heating mantle, dropping device, condenser and thermometer, and control the system temperature at 95°C to maintain the reaction 1.0h. The temperature of the system was controlled at 50°C, and 180 g of ethylenediamine was added dropwise for 1.5 hours. After the dropwise addition is completed, the temperature of the system is controlled at 50° C., and 380 g of formaldehyde is started to be added dropwise for 1.5 hours. Heat the material, control the temperature at 100°C, and react for 2.0 hours. The system was heated up and dehydrated under normal pressure and reduced pressure. Cool the material, that is, add 30g of benzyl alcohol, stir evenly, and obtain the finished product.

[0053] The technical indicators of the finished product are: amine value (mgKOH / g): 510; viscosity (25°C, mPa.s): 1450; appearance: reddish-brown transpare...

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Abstract

The invention relates to a mannich alkali hardener with flexibility and a preparation method thereof. The method comprises the following steps of: under the action of an acidic catalyst, firstly carrying out the Friedel-Crafts reaction of tung oil and phenols; then under the conditions of certain temperature and time, adding gradually amine and aldehyde into the reaction system to complete a mannich condensation reaction; removing water content and matters with a low boiling point after the reaction is finished; finally adding additives of proper amount for dissolution to obtain a finished product. The mannich alkali hardener has a flexible long chain, an intramolecular toughening capability, abundant active hydrogen and phenolic aldehyde structures in the molecular structure, good reaction activity and low temperature solidification performance, and obviously improved heat tolerance, thereby belonging to an epoxy resin hardener with excellent performance. Simultaneously, the preparation method provided by the invention is simple and easily controlled; the product is actually nontoxic and has good industrialization prospects.

Description

technical field [0001] The invention relates to a curing agent, in particular to a tough Mannich base curing agent, and at the same time, the invention also relates to a preparation method of the tough Mannich base curing agent. Background technique [0002] General-purpose epoxy resin has excellent bonding strength, chemical resistance, low shrinkage and other characteristics, and is widely used in various fields of national economy. However, only when it is used in conjunction with an excellent epoxy resin curing agent, can the above characteristics be exhibited after curing. At present, due to the fast curing speed and high irritation of unmodified amines, the cured product is brittle, the pot life is short, the proportioning requirements are strict, and it is easy to mix with CO in the air. 2 Ammonium carbonate is generated, the cured paint film is white, oily, and the curing is not complete. Simple unmodified amines are no longer used as curing agents. Epoxy resin mod...

Claims

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Application Information

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IPC IPC(8): C08G59/50C08L63/00C08K5/17
Inventor 刘守贵王家贵
Owner CHENGUANG RES INST OF CHEM IND
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