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Recyclable epoxy resin and preparation method

A technology for recycling epoxy resin and epoxy resin, applied in the field of recyclable epoxy resin and preparation, can solve the problems of high condition requirements, low product rate, cumbersome process, etc., and achieves simple preparation process, good recovery, and alleviation of the environment. The effect of pollution

Inactive Publication Date: 2018-06-08
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, some polymers are modified by dynamic covalent chemical bonds, but this type of modification is to directly graft dynamic covalent chemical bonds on the polymer, such as the modification of rubber, resulting in low efficiency of the preparation process, The conditions are high, the process is cumbersome, and the product rate is low. The above-mentioned problems will also exist when this method is introduced into the preparation of epoxy resin.

Method used

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  • Recyclable epoxy resin and preparation method
  • Recyclable epoxy resin and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Step 1: Dissolve 15.0g ethylenediamine in 30ml methanol, stir at room temperature for 10min to obtain clear solution 1; weigh 16.5g terephthalaldehyde, dissolve in 15ml methanol, and ultrasonically treat for 5min at room temperature to obtain a clear solution 2. The solution 1 was heated to 40°C, and the solution 2 was slowly added dropwise to the rapidly stirring solution 1 with a constant pressure dropping funnel. After fully reacting for 12 hours, vacuum drying was performed to obtain an epoxy curing agent containing an imine bond structure. The structural formula is as follows:

[0032]

[0033] Step 2: Mix 100g of bisphenol A epoxy resin solution E51 with 28g of the above-prepared curing agent evenly, put it into a vacuum oven for vacuum deaeration for 30-50min, and pour the deaerated solution into a preheated stainless steel mold The epoxy resin was obtained after curing at 60° C. for 4 hours, post-curing at 80° C. for 4 hours, and cooling and demoulding.

[...

Embodiment 2

[0036] 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 ultrasonically treat it for 5min at room temperature , a clear solution 2 was obtained. The solution 1 was heated to 40°C, and the solution 2 was slowly added dropwise to the rapidly stirring solution 1 with a constant pressure dropping funnel. After fully reacting for 12 hours, vacuum drying was performed to obtain an epoxy curing agent containing an imine bond structure. The structural formula is as follows:

[0037]

[0038] Step 2: Mix 100g of bisphenol A epoxy resin solution E51 with 60g of the above-prepared curing agent evenly, put it in a vacuum oven for vacuum deaeration for 30-50min, and pour the deaerated solution into a preheated stainless steel mold The epoxy resin is obtained after curing at 60° C. for 4 hours, after curing at 10...

Embodiment 3

[0041] 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 trimesicaldehyde and dissolve it in 15ml of ethanol / In dichloromethane solvent, sonication was performed at room temperature for 5 min to obtain clear solution 2. The solution 1 was heated to 40°C, and the solution 2 was slowly added dropwise to the rapidly stirring solution 1 with a constant pressure dropping funnel. After fully reacting for 12 hours, vacuum drying was performed to obtain an epoxy curing agent containing an imine bond structure. The structural formula is as follows:

[0042]

[0043]Step 2: Mix 100g of bisphenol A epoxy resin solution E51 with 25g of the above-prepared curing agent evenly, put it in a vacuum oven for vacuum deaeration for 30-50min, and pour the deaerated solution into a preheated stainless steel mold The epoxy resin was obtained after curin...

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Abstract

The invention provides recyclable epoxy resin and a preparation method. A polyamine curing agent with a dynamic imine bridging bond structure is synthesized and performs cross-linking curing on epoxyresin, and novel epoxy resin with recycling property is obtained. The method has universality for different kinds of epoxy resin, reaction conditions are mild, a preparation technology is simple, no additives are required during recycling, furthermore, on the basis of the heat exchange reaction of imine bonds, better recycling can be realized under the air hot-press condition, and most mechanicalproperties 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 specifically relates to a recyclable epoxy resin and a preparation method, and belongs to the field of recyclable polymers. Background technique [0002] Epoxy resin is widely used in all aspects of the national economy from daily necessities to high-tech fields due to its excellent physical and mechanical properties, process properties, electrical insulation properties and bonding properties. However, traditional thermosetting epoxy resins are insoluble and infusible after curing due to their irreversible chemical cross-linked network structure, which makes it difficult to reprocess and recycle them. In recent years, the global annual output of epoxy resin is about 2 million tons, but most of them cannot be recycled. These waste epoxy resins are usually landfilled, incinerated or directly degraded into small molecules by strong acids and alkalis. Serious waste of resources, energy consumption and environmental pollution. Therefore, it ...

Claims

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Application Information

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IPC IPC(8): C08G59/50
CPCC08G59/504
Inventor 汪东嵇培军张安苏王国勇
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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