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Reversible covalent cross-linked epoxy resin and preparation method thereof

A technology of epoxy resin and covalent crosslinking, which is applied in the field of reversible covalent crosslinking epoxy resin and its preparation, and can solve the problems of many reaction steps, low Young's modulus or elongation at break of epoxy resin materials, etc. , to achieve the effect of simple conditions, easy implementation, and relatively low cost

Inactive Publication Date: 2014-01-01
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But above-mentioned two kinds of epoxy resins all are to synthesize the epoxy resin monomer with the functional group of reversible reaction, there are more reaction steps, the Young's modulus of the obtained epoxy resin material or elongation at break are lower

Method used

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  • Reversible covalent cross-linked epoxy resin and preparation method thereof
  • Reversible covalent cross-linked epoxy resin and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] A kind of preparation method of reversible covalent crosslinking epoxy resin, epoxy resin monomer selects bisphenol A diglycidyl ether, and the steps are as follows:

[0028] 1) At room temperature, add 38g of bisphenol A diglycidyl ether and 10g of 2-furylmethylamine into a 100mL single-necked round bottom flask and stir well, then pour it into a polytetrafluoroethylene mold and place it in a vacuum protected by argon In an oven, react at room temperature for 12 hours, then heat to 65°C for 8 hours to obtain a light yellow transparent solid that is a linear epoxy resin;

[0029] 2) Demould the obtained linear epoxy resin at room temperature and dissolve it in 200mL of N,N'-dimethylacetamide, add 18g of N,N'-(4,4'-methylenediphenyl) Bismaleimide, after stirring evenly, pour it into a mold placed in a vacuum oven, remove the N,N'-dimethylacetamide solvent under vacuum conditions, and then react at 60°C for 20 hours to obtain a yellow transparent solid It is a reversible...

Embodiment 2

[0033] A kind of preparation method of reversible covalent cross-linking epoxy resin, epoxy resin monomer selects polyethylene glycol diglycidyl ether, and the steps are as follows:

[0034] 1) Add 10.5g polyethylene glycol diglycidyl ether (number average molecular weight: 526), ​​1.9g 2-furylmethylamine and 40mL tetrahydrofuran into a 100mL single-necked round bottom flask at room temperature, stir well, and store at 60°C under nitrogen protection After reacting for 24 hours, the tetrahydrofuran solvent was removed by rotary evaporation, and the obtained yellow liquid was linear polyethylene glycol with a furan group in the side chain;

[0035] 2) Dissolve the obtained linear polyethylene glycol with furan group in the side chain into 20mL N,N'-dimethylacetamide at room temperature, add 7.1g N,N'-(4,4'- Methyl diphenyl) bismaleimide, after stirring evenly, pour it into a mold placed in a vacuum oven, remove the N, N'-dimethylacetamide solvent under vacuum conditions, and the...

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Abstract

The invention discloses a reversible covalent cross-linked epoxy resin. The reaction between diene monoamine and an epoxy resin monomer is adopted for obtaining a linear epoxy resin with a diene on a side chain, the linear epoxy resin and a dienophile cross-linking agent form a Diels-Alder reversible reaction cross-linked point on the side chain, the reversible covalent cross-linked bond of the cross-linked epoxy resin breaks at a temperature of 100 to 150 DEG C, and can be restored again when the temperature is lowered to below 90 DEG C, so that the crosslink reversibility can be achieved. The reversible covalent cross-linked epoxy resin and the preparation method, provided by the invention, have the advantages that: (1), the reversible covalent cross-linked point is introduced to the side chain of the linear epoxy resin, so that the thermostability, solvent corrosion resistance and mechanical property of the material are improved, and by changing the cross-linking density, the material performance can be adjusted within a larger range; (2), both structures of the diene and the dienophile in the cross-linked epoxy resin have reversible reaction properties, so that recycling and reprocessing under certain conditions can be conducted; (3), the preparation method is simple and convenient, and is easy to implement, the relative cost is low, and raw material sources are wide.

Description

technical field [0001] The invention belongs to the epoxy resin-based polymer material preparation technology, in particular to a reversible covalently crosslinked epoxy resin and a preparation method thereof. Background technique [0002] Epoxy resin materials have many advantages such as strong adhesion, low shrinkage, high dielectric properties, strong chemical stability, and mold resistance. Therefore, it has a wide range of applications in the fields of adhesives, civil construction materials, device packaging, and coatings. The traditional covalent bond cross-linked epoxy resin material has high strength due to its high cross-link density, but poor toughness. Similar to other cross-linked polymer materials, due to the irreversibility of the cross-linking reaction, once formed, it is difficult to process again, especially after the material is damaged, it is difficult to recycle, resulting in large losses and waste of resources. Therefore, the introduction of reversib...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08G59/14C08G59/22
Inventor 孙平川何鑫陈胜利吴强陈铁红
Owner NANKAI UNIV
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