Method for recovering fiber from epoxy resin/fiber composite material

A fiber composite material and epoxy resin technology, applied in the field of recycled fibers, can solve the problems of fiber monofilament tensile strength loss, mechanical property loss, waste of resources, etc., and achieve the effect of increasing the decomposition rate, reducing the impact and reducing the loss.

Active Publication Date: 2010-07-28
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, physical recycling is to mechanically crush waste materials and use them as fillers to make recycled products, but this method is only applicable to uncontaminated materials, and the use value of recycled products is low; heat energy recovery refers to directly burning waste materials to obtain heat energy , suitable for waste materials with high resin content, but at the same time the fibers in them are also burned as fuel, wasting resources; chemical recycling is to decompose the matrix resin in waste materials into small molecules by heating or solvents so as to decompose fibers or other inorganic For material recovery, the pyrolysis method requires a higher temperature, and the properties of the fibers obtained after decomposition are greatly reduced. However, by solvent decomposition of waste materials, damage to the fibers in waste materials can be avoided by crushing or pulverization, and fibers with less loss of mechanical properties can be obtained. , and the resin can be recycled at the same time, therefore, the solvent decomposition method is one of the research hotspots in the recycling method of waste epoxy resin composite materials
[0004] The prior art has disclosed a variety of methods for solvent decomposition and recovery of waste epoxy resin composite materials. F

Method used

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  • Method for recovering fiber from epoxy resin/fiber composite material
  • Method for recovering fiber from epoxy resin/fiber composite material
  • Method for recovering fiber from epoxy resin/fiber composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Select a composite material in which the matrix resin is cured bisphenol A diglycidyl ether type epoxy resin and the reinforcing material is carbon fiber, wherein the epoxy resin accounts for 40% by mass of the composite material, and the composite material with a thickness of 0.1 cm is cut into a rectangular piece of 1cm×5cm;

[0043] Mix 50g of water, 8g of phenol and 0.2g of potassium hydroxide to make reaction mother liquor, add it into a high-pressure stainless steel reactor with a volume of 100mL, and then add 20g of the above-mentioned composite material; heat the reactor to 300°C after sealing, and react for 90min; cool Finally, the solid fibers are taken out, soaked in acetone and cleaned, and dry to obtain clean carbon fibers; at this time, the resin decomposition rate is 98.7%, and the resin decomposition rate=(the quality of the epoxy resin decomposed / resin content in the composite material)× 100%.

[0044] A monofilament tensile strength test is carried ou...

Embodiment 2

[0046] The reaction time was controlled to 60min, and the other conditions were the same as in Example 1 to decompose the composite material and recycle the fibers. At this time, the resin decomposition rate was 96.3%; the loss of monofilament tensile strength of carbon fiber was 1.4%.

Embodiment 3

[0048] The reaction temperature was controlled at 350° C., the reaction time was controlled at 30 minutes, and other conditions were the same as in Example 1 to decompose the composite material and recover fibers. At this time, the resin decomposition rate was 100%; the loss of single filament tensile strength of carbon fiber was 3.2%.

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PUM

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Abstract

The invention provides a method for recovering fiber from an epoxy resin/fiber composite material, which comprises the following steps: mixing the first epoxy resin/fiber composite material with reaction mother liquor for obtaining a first mixed material; heating the mixed material for decomposing the first epoxy resin/fiber composite material; and recovering the fiber from decomposition products of the first epoxy resin/fiber composite material, wherein the reaction mother liquor comprises phenolic compounds, water and a catalyst; and the catalyst in the reaction mother liquor is an alkali metal hydroxide. The method adopts the solvent decomposition method for decomposing the epoxy resin/fiber composite material without the need of carrying out breaking or smashing and other pretreatment on the epoxy resin/fiber composite material, thereby reducing the impacts on the mechanical properties of the fiber, reducing the loss of the mechanical properties of the fiber, being more conductive to carrying out plastic injection molding, hot compression molding or making into non-woven fabric for further application. Simultaneously, the method provided by the invention can realize higher decomposition efficiency of resin and lower cost.

Description

technical field [0001] The invention relates to the technical field of recycling waste polymers, in particular to a method for recycling fibers from epoxy resin / fiber composite materials. Background technique [0002] Epoxy resin composite materials, especially fiber-reinforced epoxy resin composite materials, have the advantages of high strength, light weight, heat resistance, chemical resistance, and high reliability, and are widely used in electronic power, transportation, aerospace, sports equipment, wind power, etc. Power generation and other fields. However, this kind of material has a certain service life, and it has a three-dimensional cross-linked network structure, so it cannot be re-melted and re-molded after being discarded. The traditional method of disposing of epoxy resin composite waste is landfill and incineration. These two treatment methods not only pollute the environment, but also waste materials. For example, fiber production in fiber-reinforced epoxy ...

Claims

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Application Information

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IPC IPC(8): C08J11/24C08L63/00C08K7/02
CPCY02W30/62
Inventor 唐涛刘杰姜治伟马丽
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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