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Application of Heteropolyacids and Lewis Acids as Catalysts in Degradation of Thermosetting Resins

A thermosetting, heteropolyacid technology, applied in the field of heteropolyacids and Lewis acids, to achieve the effect of excellent mechanical properties

Active Publication Date: 2018-09-18
江苏中信世纪新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the stable chemical structure and high-density cross-linked network of thermosetting resins in composite materials, recycling of materials is a great challenge

Method used

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  • Application of Heteropolyacids and Lewis Acids as Catalysts in Degradation of Thermosetting Resins
  • Application of Heteropolyacids and Lewis Acids as Catalysts in Degradation of Thermosetting Resins
  • Application of Heteropolyacids and Lewis Acids as Catalysts in Degradation of Thermosetting Resins

Examples

Experimental program
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Effect test

Embodiment Construction

[0021] (1) Example of chemical degradation using a heteropolyacid catalyst system

[0022] The degradation reaction is carried out in a pressure reactor. Dissolve 0.2g of phosphotungstic acid in 20.0g of water. The resulting solution and 6.0 g of epoxy-anhydride cured product were charged into the pressure reactor. The temperature of the reactor was raised to the predetermined temperature and reacted for 5 hours. After the reaction, the reactor was cooled to room temperature, and the reaction solution was filtered. The degraded polymer was washed with water to remove residual catalyst, and then dried in a vacuum oven at 80 °C. The final degradation product was light yellow powder. The infrared analysis results before and after resin degradation are as follows: figure 2 shown.

[0023] (2) Example of chemical degradation using a Lewis acid catalyst system

[0024] The degradation reaction is carried out in a pressure reactor. The ZnCl2 / ethanol solution and the epoxy-am...

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PUM

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Abstract

The invention discloses application of heteropoly acid and lewis acid as a catalyst to degradation of thermosetting resin. Compared with a supercritical and high-temperature pyrolysis method, a chemical catalyst degradation method can be used for selectively breaking a specific chemical bond (an ester or ether bond) of the thermosetting resin under a moderate reaction condition (less than 200 DEG C), so that soluble and machinable degradable resin is obtained. When the degradable resin is used as a reactive curing agent and is added into a novel resin system, an obtained curing material still keeps excellent mechanical properties.

Description

technical field [0001] The present invention relates to the use of a heteropolyacid and a Lewis acid. Background technique [0002] A thermosetting resin is an insoluble and infusible material with a cross-linked structure formed by a polymerization reaction during curing and molding. Once crosslinked, the polymer cannot be reprocessed or reshaped. Compared with thermoplastics, thermosetting polymers have good dimensional stability, chemical resistance, and high thermal stability, so they are widely used in coatings, adhesives, structural composites, and electronic materials. Due to the stable chemical structure and high-density cross-linked network of thermosetting resins in composite materials, material recycling is a great challenge. At present, landfill and incineration are the main ways to deal with waste materials and scraps generated during processing. If the fibers and resins in composite materials can be recycled and utilized, the economy will be greatly improved...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/16C08L63/00C08L67/06C08L75/04C08L33/00C08L61/06
CPCC08J11/16C08J2333/00C08J2361/06C08J2363/00C08J2367/06C08J2375/04Y02P20/54Y02W30/62
Inventor 虞天笔张锦文刘湍辛俊娜陈永华
Owner 江苏中信世纪新材料有限公司
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