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Reversible covalent crosslinked polyurethane and epoxy resin composite and preparation method thereof

A technology of epoxy resin and composite material, applied in the field of reversible covalently cross-linked polyurethane-epoxy resin composite material and its preparation, can solve the problem of difficulty in recycling or reprocessing, poor performance controllability and regulation, isocyanide The problem of high acid radical reaction activity is to achieve the effect of simple and controllable preparation method, wide applicability and high product yield.

Inactive Publication Date: 2014-03-19
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the irreversibility of the reaction, the composite material obtained by reacting polyurethane and epoxy resin is difficult to recycle or reprocess once it is molded or damaged during material use, which will cause a large waste of resources.
At the same time, the isocyanate in polyurethane raw materials has high reactivity and is prone to side reactions with epoxy resin, resulting in poor controllability and adjustability of the performance of the material.

Method used

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  • Reversible covalent crosslinked polyurethane and epoxy resin composite and preparation method thereof
  • Reversible covalent crosslinked polyurethane and epoxy resin composite and preparation method thereof
  • Reversible covalent crosslinked polyurethane and epoxy resin composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of preparation method of reversible covalently crosslinked polyurethane-epoxy resin composite material, the long-chain diol of synthesizing linear polyurethane is based on polytetrahydrofuran diol, and the steps are as follows:

[0028] 1) Add 20g of N,N'-dimethylacetamide, 20mg of stannous isooctanoate and 5g of 4,4'-diphenylmethane diisocyanate in turn to dissolve in a round bottom flask to obtain solution a; Polytetrahydrofuran diol was dissolved in 40 g of N,N'-dimethylacetamide to obtain solution b; under nitrogen protection, solution b was added dropwise to solution a, and the temperature was controlled at 60°C for 4 hours to obtain a prepolymerized product; Then add 2.6g N-(2,3-dihydroxypropyl)maleimide chain extender, keep warm for 3.5 hours to obtain a linear polyurethane solution;

[0029] 2) Add 5.4g of bisphenol A diglycidyl ether and 1.4g of 2-furylmethylamine into a polytetrafluoroethylene beaker and stir evenly; place in an argon-protected oven, re...

Embodiment 2

[0040] A kind of reversible covalently cross-linked polyurethane-epoxy resin composite material, the preparation method of long-chain diol based on poly(ε-caprolactone) diol for synthesizing linear polyurethane, the steps are as follows:

[0041] 1) Add 30g of N,N'-dimethylacetamide, 24mg of stannous isooctanoate and 5.1g of 4,4'-diphenylmethane diisocyanate in turn to dissolve in a round bottom flask to obtain solution a; The poly(ε-caprolactone) diol was dissolved in 50g N,N'-dimethylacetamide to obtain solution b; under nitrogen protection, solution b was added dropwise to solution a, and the temperature was controlled at 65°C React for 3 hours to obtain a prepolymerized product; then add 2.7g N-(2,3-dihydroxypropyl)maleimide chain extender to carry out chain extension reaction, keep warm for 4 hours to obtain a linear polyurethane solution;

[0042] 2) Add 2.7g of bisphenol A diglycidyl ether and 0.7g of 2-furylmethylamine into a polytetrafluoroethylene beaker and stir eve...

Embodiment 3

[0046] A kind of reversible covalently crosslinked polyurethane-epoxy resin composite material, the isocyanate of synthesizing linear polyurethane is the preparation method of 1,6-hexamethylene diisocyanate, and the steps are as follows:

[0047] 1) Add 17g of N,N'-dimethylacetamide, 14mg of dibutyltin dilaurate, and 3.4g of 1,6-hexamethylene diisocyanate in turn to dissolve in a round bottom flask to obtain solution a; Polytetrahydrofuran diol was dissolved in 20g N,N'-dimethylacetamide to obtain solution b; under nitrogen protection, solution b was added dropwise to solution a, and the temperature was controlled at 68°C for 3 hours to obtain a prepolymerized product ; Then add 2.6g N-(2,3-dihydroxypropyl) maleimide chain extender, keep warm and react for 4 hours to obtain a linear polyurethane solution;

[0048] 2) Add 8.1g of bisphenol A diglycidyl ether and 2.1g of 2-furylmethylamine into a polytetrafluoroethylene beaker and stir evenly; place in an argon-protected oven, r...

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Abstract

The invention discloses a reversible covalent crosslinked polyurethane and epoxy resin composite comprising two components: linear polyurethane and linear epoxy resin, wherein side chains of the reversible covalent crosslinked polyurethane and epoxy resin composite are respectively provided with a dienophile functional group and a diene functional group; the composite is a material with a crosslinked network structure, which is formed by connecting linear polyurethane and linear epoxy resin through a Diels-Alder reversible covalent bond; the Diels-Alder reversible covalent bond can be reversibly broken and bonded through temperature adjustment, so that the composite conversion between a linear polymer and the material with the crosslinked network structure has the characteristic of reversible covalent crosslinking. The reversible covalent crosslinked polyurethane and epoxy resin composite has the advantages that the mechanical and thermodynamic properties are excellent, and the mechanics can be adjusted within a relatively wide range; the preparation method is simple, convenient and controllable, the reversible covalent crosslinked polyurethane and epoxy resin composite is high in yield, good in quality and wide in application range, and the performance of the composite can be optimized through being re-modified by using filler.

Description

technical field [0001] The invention belongs to polymer-based composite materials, in particular to a reversible covalently crosslinked polyurethane-epoxy resin composite material and its preparation. Background technique [0002] Polyurethane materials play a very important role in daily life and production, and are widely used in shock-absorbing materials, foam materials, adhesives, coatings and other products. However, due to the poor strength, low modulus and poor thermal stability of polyurethane materials, their applications are greatly limited. Epoxy resin is a kind of common thermosetting resin, which has the advantages of high strength, high modulus and good thermal stability. It has a wide range of applications in the fields of adhesives, civil construction materials, device packaging and coatings. However, due to the high cross-linking density of conventional epoxy resins, the internal stress is large and the toughness is insufficient, and the use is also greatl...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08L75/08C08L75/06C08L63/00C08J3/24C08G18/66C08G18/32C08G18/10C08G59/50
Inventor 孙平川何鑫陈胜利吴强陈铁红
Owner NANKAI UNIV
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