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Non-ionic self-emulsifying epoxy resin curing agent and preparation method thereof

An epoxy resin curing, non-ionic technology, applied in the field of non-ionic self-emulsifying epoxy resin curing agent and its preparation, can solve the problems of increased cost, many operation steps, high viscosity of curing agent, etc., and achieve the overall coating film Improved performance, simple preparation equipment, and excellent mechanical properties

Inactive Publication Date: 2013-06-12
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commercial development of cardanol is mainly the preparation of modified phenolic resin, which is also applied to the preparation of Mannich base. The obtained Mannich base cured epoxy resin has excellent performance, but it is an oily product. Chinese patent CN02116454. 1. Chinese patent CN201210106159.2 and Chinese patent CN200810033592.1 both proposed the preparation method of cashew phenalkamine. These patents all have the following disadvantages: the obtained curing agent has a high viscosity and is an oily product, which is inconvenient for construction and difficult for tool cleaning. If Cleaning with organic solvents will definitely cause health hazards to the builders; on the surface of wet substrates, such as wet concrete surfaces, it cannot be spread well, and various appearance problems may be caused after curing, and the performance will also decline; the scope of application is therefore It is limited and cannot be used in combination with water-based materials, such as directly used to modify Portland cement
A non-ionic modified addition amine curing agent is obtained. Compared with the addition amine curing agent, its water resistance and chemical resistance will be significantly reduced
Moreover, according to the descriptions of these two patents, it can be seen that the production and reaction of this product take a relatively long time, basically more than 10 hours, and there are many operating steps.
Similar non-ionic modified addition amine curing agent also has Chinese patent CN201110377636.4, which uses more organic solvents such as acetone and butanone in the preparation process, which not only increases the cost, but also is not conducive to the health of production workers

Method used

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  • Non-ionic self-emulsifying epoxy resin curing agent and preparation method thereof
  • Non-ionic self-emulsifying epoxy resin curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 100g of cardanol and 58.93g of m-xylylenediamine into a 250ml three-necked flask equipped with a stirrer, reflux condenser and constant pressure dropping funnel, heat to 70°C, and add 32.43g of 37wt% formaldehyde solution dropwise under stirring After 30 minutes of dropwise addition, the temperature was raised to 100°C for 3 hours, then washed with warm water, and the water layer was separated by standing. Then, at 70°C and -0.095MPa vacuum, the water was removed under reduced pressure for 30 minutes to obtain a brownish-red liquid with an amine value of 256mgKOH / g, the viscosity is 1765mPas, lowered to room temperature for use.

[0037] Add 100g of polyethylene glycol 6000 and 13.06g of epoxy resin E51 into a 250ml flask with a stirrer, raise the temperature to 90°C, and under stirring, add the catalyst boron trifluoride ether 0.27g in 6 times, each interval 20min, reacted for 120min, a white waxy solid was obtained.

[0038]Take 15g of the white waxy solid and 8...

Embodiment 2

[0043] Add 90g of cardanol and 66.3g of isophoronediamine into a 250ml three-neck flask equipped with a stirrer, a reflux condenser and a constant pressure dropping funnel, heat to 70°C, and dropwise add 37wt% formaldehyde solution 26.76 g, after 30 minutes of dropwise addition, warm up to 100°C for 3 hours, wash with warm water, let stand to separate the water layer, and then remove water under reduced pressure at 70°C and -0.095MPa vacuum for 30 minutes to obtain a brownish-red liquid with an amine value of 295mgKOH / g, viscosity 2256mPas, cooled to room temperature for use.

[0044] Add 100g of polyethylene glycol 6000 and 13.06g of epoxy resin E51 into a 250ml flask with a stirrer, raise the temperature to 90°C, and under stirring, add the catalyst boron trifluoride ether 0.27g in 6 times, each interval 20min, reacted for 120min, a white waxy solid was obtained.

[0045] Take 20g of the white waxy solid, 80g of the above-mentioned maroon liquid and 3g of γ-glycidyl ether p...

Embodiment 3

[0049] Add 100g of cardanol and 63.27g of triethylenetetramine into a 250ml three-necked flask equipped with a stirrer, a reflux condenser and a constant pressure dropping funnel, heat to 70°C, and add 32.43g of 37wt% formaldehyde solution dropwise while stirring, After 30 minutes of dropping, raise the temperature to 100°C for 2 hours, then wash with warm water, let stand to separate the water layer, and then remove water under reduced pressure at 70°C and -0.095MPa vacuum for 30 minutes to obtain a brownish-red liquid with an amine value of 268mgKOH / g, the viscosity is 1605mPas, lowered to room temperature for use.

[0050] Add 100g of polyethylene glycol 6000 and 13.06g of epoxy resin E51 into a 250ml flask with a stirrer, raise the temperature to 90°C, and under stirring, add a total of 0.27g of boron trifluoride ether as a catalyst in 6 times, each interval 20min, reacted for 120min, a white waxy solid was obtained.

[0051] Take 8g of the white waxy solid and 92g of th...

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Abstract

The invention discloses a non-ionic self-emulsifying epoxy resin curing agent and a preparation method thereof. The method comprises that polyethylene glycol and epoxy resin of low molecular weight are adopted to pre-prepare a water-based chain segment under the function of a catalytic agent, the water-based segment is reacted with a mannich base which is prepared from cardanol, formaldehyde and polymine, and at the same time, organosilicone is added to conduct partial end blocking, compatibility of a system on an inorganic component is increased, and the non-ionic cashew phenol amine epoxy curing agent with the self-emulsifying capacity is obtained. The natural cardanol and the polyethylene glycol in the main raw materials of the curing agent have no adverse effect on environment. The prepared curing agent integrates the advantages of non-ionic emulsion and cashew phenol amine.

Description

technical field [0001] The invention relates to a nonionic self-emulsifying epoxy resin curing agent and a preparation method thereof. Background technique [0002] Epoxy resin products are widely used in life and industry because of their excellent mechanical properties and chemical resistance. Epoxy resin curing agents are products used for hardening epoxy resins, which have an important impact on the curing properties of epoxy resins. Amine curing agents are mainly used for room temperature curing epoxy resins. With the improvement of social awareness of environmental protection and the release of stricter regulations on volatile organic solvents in many countries, water-based products have already become a trend. Cardanol itself is a by-product of the cashew nut processing industry, which is natural, biodegradable and in line with sustainable development. The commercial development of cardanol is mainly the preparation of modified phenolic resin, which is also applied ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/64C08G81/00C08G65/48C08G14/073C08G14/06
Inventor 王飞镝李庭忠郭宝春易国斌康正张一聪
Owner GUANGDONG UNIV OF TECH
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