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Method for nondestructive recovery of reinforcement in waste carbonyl-containing thermosetting resin under mild conditions

A reinforcement and thermosetting technology, applied in the field of degradation of polymer composite materials, can solve the problems of low efficiency and harsh waste recycling conditions, and achieve the effects of high resin removal rate, low requirements for reaction equipment, and mild degradation temperature

Pending Publication Date: 2021-11-09
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of harsh recovery conditions and low efficiency of carbonyl-containing thermosetting resin waste in the prior art, and to provide a method for non-destructive recovery of carbonyl-containing thermosetting resin reinforcement under mild conditions

Method used

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  • Method for nondestructive recovery of reinforcement in waste carbonyl-containing thermosetting resin under mild conditions
  • Method for nondestructive recovery of reinforcement in waste carbonyl-containing thermosetting resin under mild conditions
  • Method for nondestructive recovery of reinforcement in waste carbonyl-containing thermosetting resin under mild conditions

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specific Embodiment approach 1

[0027] A method for recycling carbon fiber reinforcements from waste carbonyl-containing thermosetting resins, taking unsaturated polyester composite materials as an example, specifically includes the following steps: firstly, the waste unsaturated polyester composite materials are subjected to the first pretreatment, and the second The pretreated resin is mixed with an alkaline solution and heated to obtain a degradation product that can be further degraded.

[0028] Further, the above-mentioned first pretreatment method includes: mechanically cutting short and soaking in an alkaline solution, the alkaline solution includes an alkaline solvent and an alkaline substance, and the alkaline solvent includes but is not limited to Hydrazine and hydrazine derivatives, organic solutions of 2-hydroxyethylamine, 1,2-propylenediamine, 1,3-propylenediamine, 1,4-butylenediamine, diethylenetriamine, triethylenetetramine and water mixture. The alkaline substances include but are not limite...

Embodiment 1

[0042] Mechanically pulverize 20g of waste commercial unsaturated polyester to 20-40 mesh, weigh 1g of pulverized resin, add 3.9996g of NaOH and 4.86mL of 80% hydrazine hydrate solution to mix, heat to 80°C and continue to react for 2 hours to obtain degradation products, degradation products The solid product and the degradation solution were obtained by filtration. The solid product was dried at 80° C. for three days and weighed to measure 0.45 g. The calculated degradation rate was 55%.

Embodiment 2

[0044] Mechanically pulverize 20g of waste commercial unsaturated polyester to 20-40 mesh, weigh 1g of pulverized resin, add 2.6664g of NaOH and 6.48mL of 80% hydrazine hydrate solution to mix, heat to 80°C and continue to react for 2 hours to obtain degradation products, degradation products The solid product and the degradation solution were obtained by filtration. The solid product was dried at 80° C. for three days and weighed to measure 0.37 g. The calculated degradation rate was 63%.

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Abstract

The invention discloses a method for nondestructive recovery of a reinforcement in waste carbonyl-containing thermosetting resin under mild conditions and belongs to the technical field of polymer composite degradation. The specific scheme comprises the following steps: step 1, mixing the waste carbonyl-containing thermosetting resin with an alkaline solution, and heating to obtain a liquid-phase product and a gel-state solid-phase product; 2, regulating swelling of a solid-phase product in a gel state in different solvents to enable the solid-phase product to have viscosity, and removing resin on the surface of the reinforcement by adopting a physical separation mode after drying to obtain a precursor of the reinforcement; step 3, further degrading the precursor of the reinforcement by adopting an advanced oxidation technology, and recovering to obtain the reinforcement. According to the invention, the reaction solvent is green, the degradation temperature is mild, and the energy consumption is reduced; the degradation process is rapid and efficient, the resin removal rate reaches up to 100%, nondestructive recovery of the carbon fibers can be achieved, and high-added-value carbon fiber resources are recycled; and the method has very important industrialization prospects.

Description

technical field [0001] The invention belongs to the technical field of degradation of polymer composite materials, and in particular relates to a method for non-destructive recovery of reinforcements in waste carbonyl-containing thermosetting resins under mild conditions. Background technique [0002] Carbonyl-containing thermosetting resins represented by unsaturated polyester resins are the most used thermosetting resins in my country. They have the characteristics of high specific strength, low price and mild curing conditions, and play an irreplaceable role in many application fields. For example, aerospace , shipbuilding industry, wind power energy, pressure vessels and other fields. Unsaturated polyester composites contain a large number of stable carbon-carbon bond crosslinked network structures, which make them more difficult to degrade than thermoplastic resins. In recent years, with the continuous increase of the amount of unsaturated polyester composite materials,...

Claims

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Application Information

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IPC IPC(8): C08J11/00C08L101/06
CPCC08J11/00C08J2300/104Y02W30/62
Inventor 胡桢王宝龙黄玉东刘丽卢飞许樨榕许宁觌原玮颢刘莹莹沈一博李达
Owner HARBIN INST OF TECH
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