Degradation solution and method of decomposing epoxy resin

Patent metadata

Field	Value
Publication number	US-2025188249-A1
Application number	US-202318391968-A
Country	US
Kind code	A1
Filing date	Dec 21, 2023
Priority date	Dec 7, 2023
Publication date	Jun 12, 2025
Grant date	—

Abstract

A degradation solution includes 100 parts by weight of 30 to 50 vol % of hydrogen peroxide aqueous solution, 44 to 80 parts by weight of C 2 to C 4 organic acid or anhydride thereof, 50 to 90 parts by weight of an organic acid containing a plurality of carboxylic acid groups, and 1 to 15 parts by weight of degradation auxiliary agent. The degradation solution can be used to decompose an epoxy resin.

First claim

What is claimed is:

1 . A degradation solution, comprising:
100 parts by weight of 30 to 50 vol % of hydrogen peroxide aqueous solution; 44 to 80 parts by weight of C 2 to C 4 organic acid or anhydride thereof; 50 to 90 parts by weight of an organic acid containing a plurality of carboxylic acid groups; and 1 to 15 parts by weight of degradation auxiliary agent.

2 . The degradation solution as claimed in claim 1 , wherein the C 2 to C 4 organic acid comprises acetic acid, propionic acid, butyric acid, or a combination thereof.

3 . The degradation solution as claimed in claim 1 , wherein the organic acid containing a plurality of carboxylic acid groups comprises malonic acid, succinic acid, glutaric acid, maleic acid, malic acid, citric acid, or a combination thereof.

4 . The degradation solution as claimed in claim 1 , wherein the degradation auxiliary agent comprises copper chloride, cuprous chloride, zinc chloride, potassium permanganate, sulfuric acid, phosphoric acid, or a combination thereof.

5 . The degradation solution as claimed in claim 1 , further comprising 5 to 34 parts by weight of water.

6 . A method of decomposing epoxy resin, comprising:
soaking a waste material containing epoxy resin in the degradation solution as claimed in claim 1 at a temperature of 25° C. to 100° C. under a normal pressure for 1 to 72 hours, wherein the epoxy resin in the waste material is decomposed by the degradation solution to form a residual liquid.

7 . The method as claimed in claim 6 , wherein the waste material further comprises a fiber, and the epoxy resin is decomposed by the degradation solution to separate the fiber from the waste material.

8 . The method as claimed in claim 7 , further comprising washing and drying the fiber separated from the waste material, and recycling and reusing the fiber.

9 . The method as claimed in claim 7 , wherein the fiber comprises carbon fiber, glass fiber, or a combination thereof.

10 . The method as claimed in claim 6 , further comprising distilling the residual liquid or concentrating the residual liquid under reduced pressure to recycle the C 2 to C 4 organic acid.

Assignees

• Ind Tech Res Inst

Inventors

• Chen Jhen-Rong
• Huang Chiung-Hui
• Yeh Jih-Hsiang

Classifications

• B29B2017/0293

  Dissolving the materials in gases or liquids · CPC title

• B29L2031/085

  Wind turbine blades · CPC title

• B29L2031/3005

  Body finishings · CPC title

• B29B17/02 Primary

  Separating plastics from other materials · CPC title

• Y02W30/62

  Plastics recycling; Rubber recycling · CPC title