Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Chemically Decomposable Epoxide Resin System

a technology of epoxide resin and cured epoxide, which is applied in the field of chemically decomposable can solve the problems of difficult recycling of cured epoxide resin systems, economic problems, and inability to recycle by melting or dissolving analogous to thermoplastics

Inactive Publication Date: 2016-12-01
FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an epoxide resin system that can be economically decomposed without compromising the properties of cured epoxide resin systems. The addition of cyanates as a curing agent leads to a highly decomposable material with excellent material properties. The cured epoxide resin product can be finely ground and recycled economically by exposing it to an aminolysis. Alternatively, larger components with or without enforcing fibers can be decomposed even without shredding, allowing for longer fiber recycling. The use of aromatic cyanates is preferred as they are well available and less expensive. The invention also provides the possibility to remove the resin matrix without significantly impacting the mechanical properties of the reinforcing fibers.

Problems solved by technology

The recycling of cured epoxide resin systems is difficult due to its cross-linked structure.
Therefore, recycling by melting or dissolving analoguous to thermoplastics is not possible.
They are not economic due to the long durations.
Furthermore, aggressive or corrosive chemicals are necessary with such methods.
The regeneration of the decomposition products generated during the decomposition is expensive.
The anhydridically cured epoxide resins have great disadvantages regarding storage stability of the uncured resin-curing agent-mixture.
For this reason they cannot be used for the production of storable prepreg-type materials.

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
  • Chemically Decomposable Epoxide Resin System
  • Chemically Decomposable Epoxide Resin System
  • Chemically Decomposable Epoxide Resin System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035]FIG. 1 shows the dependency of normed sample mass on the ordinate axis on the decomposition duration on the abscissa axis for different samples at 20° C. 2-aminoethanol was used as recycling agent. The homopolymer 1,1′-bis(4-cyanatophenyl)ethane, also called LECY, shown in formula V can be decomposed in a relatively short period of time. This is illustrated by the graph 97 in FIG. 1. The decomposition times increase with increasing DGEBF-content when LECY is used as a curing agent for the epoxide resin diglycidyl ether of Bisphenol F, also called DGEBF. The polymer 80 with 40 mass-% DGEBF shows a different decomposition behaviour than those with less or more epoxide resin: the sample body decomposed into several small pieces which prohibited an exact weighing. The polymer 77 has a DGEBF mass content of 10 mass-%, the polymer 78 a mass content of 20 mass-%, the polymer 79 a mass content of 30 mass-% and the polymer 81 a mass content of 50 mass-%. No significant decomposing coul...

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

PropertyMeasurementUnit
massaaaaaaaaaa
cross-linking densityaaaaaaaaaa
mass-%aaaaaaaaaa
Login to View More

Abstract

The invention relates to a chemically degradable cured epoxy resin system containing one or more epoxide resins and one or more curing agents, characterized in that the curing agent contains at least one cyanate, with which the epoxy resin reacts to form an epoxy resin polymer containing cyanurates.

Description

TECHNICAL FIELD[0001]The invention relates to a chemically decomposable cured epoxide resin system comprising one or more epoxide resins and one or more curing agents. Epoxide resins, i.e. di- or poly functional mono- or oligomers with epoxide groups can be cured with various, typically aminic or anhydridic, curing agents to cure to duromer plastic materials. Examples for suitable di- or poly functional mono- or oligomers are glycidyl ethers and glycidyl amines.PRIOR ART[0002]The recycling of cured epoxide resin systems is difficult due to its cross-linked structure. This applies, in particular, to chemical recycling under “mild” conditions. Considering the three-dimensional network such plastic materials cannot be melted or dissolved. Therefore, recycling by melting or dissolving analoguous to thermoplastics is not possible.[0003]There are special epoxide resin systems which are decomposable. Decomposition is possible only with compositions where compromises regarding properties of...

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(United States)
IPC IPC(8): C08G59/40C08K7/06C08K7/14
CPCC08G59/4014C08K7/06C08K7/14
Inventor DREYER, CHRISTIANBAUER, MONIKASOTHJE, DOMINIK
Owner FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com