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.
CN103642199AInactive Publication Date: 2014-03-19NANKAI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANKAI UNIV
Publication Date
2014-03-19
Estimated Expiration
Not applicable · inactive patent

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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.
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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

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
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