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Carbon fiber recycling compositions and methods

A composition and fiber technology, applied in chemical instruments and methods, plastic recycling, fiber chemical characteristics, etc., can solve the problems of slow recovery of alkaline catalysis, incomplete removal of resin components, and danger.

Active Publication Date: 2022-07-15
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Basic catalytic recovery is slow and often results in incomplete removal of resin components
Chemical recovery at supercritical pressure is expensive and dangerous
Additionally, ionic liquids capable of depolymerizing FRP are expensive and prone to degradation through oxidation and ionization

Method used

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  • Carbon fiber recycling compositions and methods
  • Carbon fiber recycling compositions and methods
  • Carbon fiber recycling compositions and methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 5g PPh 4 -TFSI (tetraphenyl bis(trifluoromethanesulfonyl)imide) was heated to 350°C and mixed with a 1 cm 2 A 5-layer sheet of thick CFRP was incorporated. After 10 minutes, free carbon fibers were recovered from the mixture. The recovered carbon fibers were obtained as black and blue fibers and there was very little polymer residue on the recovered fibers. The ionic liquid was recrystallized and used to treat another 1 cm block under the same conditions 2 of 5-layer sheet-thick CFRP, again recovering free fibers from the mixture.

[0053] Then use 5g fresh PPh 4 -TFSI, use a piece of 1cm 2 Experiments were repeated with 16-layer slices of CFRP. Free fibers recovered from 16-ply thick CFRP included some residual resin particles. These experiments demonstrate that the exact ratio of ionic liquid to resin mass is not critical.

[0054] PPh before and after heating 4 - TFSI with CFRP 31 P NMR to observe material changes. Some ionic liquids degrade in the presen...

Embodiment 2

[0057] The cured resin decomposition mechanism is explored in this example to understand whether ionic liquids are heat transfer fluids or are chemically involved in cured resin decomposition in CFRP. A chemically similar material with a boiling point above the process temperature was heated at 350°C for 10 minutes with a 5-layer sheet of CFRP. None of the liquids behaved as well as PPh in terms of releasing fibers from CFRP. 4 -TFSI is just as good. Table 1 below shows the PPh 4 - TFSI promotes the decomposition of cured resin in CFRP. The data also show that ionic salts, which are liquid at processing temperatures, outperform other high temperature stable fluids.

[0058] Table 1

[0059]

[0060] The data in Table 1 indicate that PPh 4 - The role of TFSI ionic liquid in breaking down CFRP resin exceeds that of heat transfer fluid because it can react with the resin in CFRP or act like a catalyst to accelerate CFRP fracture. Heat transfer fluids such as triphenylmet...

Embodiment 3

[0062] To further explore the PPh 4 -Whether TFSI is a reactant or catalyst for the depolymerization of the cured resin, making the ionic liquid 20:1 (organic:PPh) in the other organic materials in Table 1 4 -TFSI) dilution. The catalysts or reactants still function at lower levels, but if the ionic liquid is simply a solvent to swell and dissolve the epoxy resin, we would expect carbon fiber recovery to fail due to dilution in less solvated materials. Table 2 shows that 1) the ionic liquid still depolymerizes CFRP in diluted form and 2) other organic materials must all decompose CFRP efficiently to some extent to support the process. figure 1 PPh is shown in 3 When with PPh 4 - Efficacy of TFSI upon merging to induce depolymerization, before and after photographs of a partially delaminated 16-layer sheet-thick CFRP layer after processing. The layered openings allow easier deep penetration of ionic liquids into CFRP. Diluted ionic liquid alone does not cause carbon fiber ...

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Abstract

The present application relates to carbon fiber recycling compositions and methods, and discloses methods and compositions for depolymerizing the polymer components of fiber-reinforced polymers to facilitate free fiber recovery.

Description

technical field [0001] The present disclosure describes compositions for depolymerizing the polymer components of fiber-reinforced polymers and methods of using the compositions to recover free fibers from fiber-reinforced polymer components. Background technique [0002] Fiber-reinforced polymers (FRP) are widely used to create structural elements and parts used in aerospace, automotive, marine, sporting goods, and civil / structural engineering applications, among others. FRP is a lightweight, strong material with a high strength-to-weight ratio. FRP is typically formed by combining fibers with an uncured adhesive thermoset polymer or resin and then curing the adhesive polymer, or by melt impregnation under heat and pressure to combine fibers with a thermoplastic resin to form. Some non-limiting examples of FRP include carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer. [0003] The widespread use of FRP has given rise to waste disposal problems and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/00C08K7/06
CPCC07C63/28C08J11/18C08J11/28C08J11/00C08K7/06B09B5/00B09B3/40Y02W30/62B29B17/0206C08J11/04Y02W30/66D01F9/12
Inventor A·F·格罗斯J·J·瓦乔A·M·纳尔逊A·R·罗德里格斯H·达拉勒P·E·乔治
Owner THE BOEING CO
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