Method for preparing double-anion catalyst and use thereof in catalytic degradation of polyurethane material

The prepared bi-anionic catalyst utilizes the synergistic effect of metal salts, nitrogen heterocycles, and amine compounds to solve the problem of high-temperature and long-time polyurethane degradation, achieving efficient polyurethane material recovery, improving the quality and degradation rate of polyols, and making it suitable for industrial applications.

WO2026044893A1 Publication Date: 2026-03-05ZHEJIANG UNIV OF TECH
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Patent Information

Application Number
PCT/CN2024/126578
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-08-27
Filing Date
2024-10-22
Publication Date
2026-03-05

AI Technical Summary

Technical Problem

Existing technologies are insufficient for efficiently degrading and recycling high-quality polyurethane materials, especially flexible foams, resulting in low recycling rates and resource waste. Furthermore, existing catalysts require high reaction temperatures and long reaction times during the degradation process, leading to insignificant effects.

Method used

A bi-anionic catalyst is employed, which consists of a metal salt, a nitrogen heterocyclic compound containing hydroxyl or amino groups, and an amine compound. Through complexation and coordination, the catalyst enhances the attack ability of nucleophiles and the positive charge of urethane bonds, thereby reducing the reaction temperature and increasing the degradation rate and extent.

Benefits of technology

It significantly improves the rate and extent of polyurethane degradation, and the prepared polyol has a quality close to that of the raw material, with good activity and high-temperature stability, making it suitable for industrial applications.

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Abstract

Disclosed in the present invention are a method for preparing a double-anion catalyst and the use thereof in the catalytic degradation of a polyurethane material. The method comprises: dissolving a metal salt in deionized water to prepare a metal salt solution; taking a nitrogen heterocyclic compound containing hydroxyl or amino as a substrate in a reactor, adding the metal salt solution in a dropwise manner into the reactor, and performing condensation reflux at 60°C-150°C for 1-8 h; adding an amine compound in a dropwise manner, reacting the mixture after the dropwise addition has finished, and performing a vacuum filtration treatment after the reaction has finished, so as to obtain a filtrate; and evaporating the filtrate and drying the product to obtain a double-anion catalyst. The basic physical properties, such as hydroxyl value, amine value and viscosity, of a recovered polyol obtained via degradation by means of the catalyst of the present invention are substantially equivalent to those of the raw material polyol, and the recovered polyol can partially replace the raw material polyol for preparing a flexible polyurethane foam.
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