Epoxy resin curing agent and preparation method

An epoxy resin curing and curing agent technology, which is applied in the preparation of imino compounds, organic chemistry, etc., can solve the problems that epoxy resin is difficult to process and recycle, so as to alleviate environmental pollution and waste of resources, meet the needs of use, Effect of good solvent resistance and mechanical properties

Inactive Publication Date: 2018-06-08
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
View PDF1 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing traditional curing agent can only play the role of curing and cross-linking. While bringing excellent physical and chemical properties, this irreversible chemical cross-linking network is insoluble and infusible after curing and forming, resulting in very difficult epoxy resins. It is difficult to reprocess and recycle, so it is particularly important to develop a new type of epoxy resin curing agent to further improve the recyclability of epoxy resin

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Epoxy resin curing agent and preparation method
  • Epoxy resin curing agent and preparation method
  • Epoxy resin curing agent and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Weigh 15.0g of ethylenediamine and dissolve it in 30ml of methanol, stir at room temperature for 10min to obtain a clear solution 1; weigh 16.5g of terephthalaldehyde and dissolve it in 15ml of methanol, and ultrasonically treat it for 5min at room temperature to obtain a clear solution 2. Heat solution 1 to 40°C, and slowly add solution 2 drop by drop to rapidly stirred solution 1 with a constant pressure dropping funnel, and after fully reacting for 12 hours, vacuum-dry to obtain an epoxy curing agent containing an imine bond structure, The structural formula is as follows:

[0029]

[0030] Step 2: Mix 100g of bisphenol A epoxy resin solution E51 and 28g of the above-mentioned curing agent evenly, put it in a vacuum oven for 30-50 minutes to vacuumize and defoam, and pour the defoamed solution into a preheated stainless steel mold The epoxy resin was obtained after curing at 60°C for 4 hours, at 80°C for 4 hours, and after cooling and demoulding.

[0031...

Embodiment 2

[0033] Step 1: Weigh 50g of diaminodiphenylmethane (DDM) and dissolve it in 60ml of methanol, stir at room temperature for 10min to obtain a clear solution 1; weigh 16.7g of terephthalaldehyde and dissolve it in 15ml of methanol, and sonicate at room temperature for 5min , a clear solution 2 was obtained. Heat solution 1 to 40°C, and slowly add solution 2 drop by drop to rapidly stirred solution 1 with a constant pressure dropping funnel, and after fully reacting for 12 hours, vacuum-dry to obtain an epoxy curing agent containing an imine bond structure, The structural formula is as follows:

[0034]

[0035] Step 2: Mix 100g of bisphenol A epoxy resin solution E51 and 60g of the above-mentioned curing agent evenly, put it in a vacuum oven for 30-50 minutes to vacuumize and defoam, and pour the defoamed solution into a preheated stainless steel mold In the middle, cure at 60°C for 4 hours, and then cure at 100°C for 4 hours, and then obtain the epoxy resin after cooling an...

Embodiment 3

[0038] Step 1: Weigh 20g of ethylenediamine and dissolve it in 30ml of ethanol / dichloromethane solvent (volume ratio 8:2), stir at room temperature for 10min to obtain a clear solution 1; weigh 18g of trimesaldehyde and dissolve it in 15ml of ethanol / In dichloromethane solvent, sonication at room temperature for 5 min, a clear solution 2 was obtained. Heat solution 1 to 40°C, and slowly add solution 2 drop by drop to rapidly stirred solution 1 with a constant pressure dropping funnel, and after fully reacting for 12 hours, vacuum-dry to obtain an epoxy curing agent containing an imine bond structure, The structural formula is as follows:

[0039]

[0040] Step 2: Mix 100g of bisphenol A epoxy resin solution E51 and 25g of the above-mentioned curing agent evenly, put it in a vacuum oven for 30-50 minutes to vacuumize and defoam, and pour the defoamed solution into a preheated stainless steel mold The epoxy resin was obtained after curing at 60°C for 4 hours, at 90°C for 4 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides an epoxy resin curing agent and a preparation method. The curing agent is a polyamine curing agent with a dynamic imine bridging bond structure, and after the curing agent is subjected to cross-linking curing with epoxy resin, epoxy resin with excellent recycling property can be obtained. The method has universality for different kinds of epoxy resin, reaction conditions aremild, the preparation process is simple, no additives are required during recovering, besides, based on the heat exchange reaction of imine bonds, better recovery can be realized under the air hot-press condition, and most of mechanical properties are reserved after repeated cycles, so that the problems of environmental pollution and resource waste caused by waste high-polymer materials are effectively solved.

Description

technical field [0001] The invention relates to an epoxy resin curing agent and a preparation method, in particular to a curing agent for recyclable epoxy resin and a preparation method. Background technique [0002] Epoxy resin is a kind of thermosetting resin material widely used in the industry at present, but it is generally an oligomer with a small molecular weight, and its own mechanical strength is poor, so it is rarely used directly as a material, and only reacts under appropriate conditions through a curing agent , solidified into a three-dimensional network structure, in order to obtain structural materials and bonding materials with excellent performance. Therefore, in the performance research of epoxy resin, the development of epoxy resin curing agent occupies a very important position, and its related research has attracted much attention. At present, there are many kinds of epoxy curing agents, mainly including amine curing agents, acid anhydride curing agents...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/50C07C249/02C07C251/24
CPCC07C249/02C08G59/5033C07C251/24
Inventor 汪东嵇培军张安苏王国勇
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap