Catalyst for preparing carbon dioxide-based multi-arm polycarbonate polyols

By using a partially intumium-salted multifunctional ontumium salt initiator, the problems of low activity and ontumium salt ion depletion in existing initiators were solved, enabling the stable preparation of high molecular weight multi-arm carbon dioxide-based polycarbonate and improving the performance and molecular weight distribution control of the polymer.

CN120965985APending Publication Date: 2025-11-18SHANDONG LECSIN GREEN TECH CO LTD
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Patent Information

Application Number
CN202410620805.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-05-17
Publication Date
2025-11-18

AI Technical Summary

Technical Problem

Existing initiators have low reactivity, and onium salt ions are easily detached, resulting in a wide molecular weight distribution and high performance randomness in carbon dioxide-based polycarbonate products, making it difficult to prepare high molecular weight multi-arm polycarbonate plastics.

Method used

By using incompletely onium-salted multifunctional onium salt initiators and controlling the degree of neutralization between carboxylic acids and bases, highly active multi-arm macromolecular initiators are prepared for the anionic polymerization of carbon dioxide-based polycarbonates.

Benefits of technology

Stable preparation of high molecular weight multi-arm carbon dioxide-based polycarbonate was achieved, with narrow molecular weight distribution, stable polymer properties, excellent tensile strength and elongation at break, making it suitable for high-performance polyurethane materials.

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Abstract

Provided is a polyfunctional onium salt initiator having the following general formula (I): 'R (-L) n' '(MR'x) bHc' (I) wherein n = b + c; r (-L) n is an n-valent anionic group derived from (A) a nitrogen-free aliphatic or aromatic organic polycarboxylic acid, (B) a polyphenol, (C) a polyacrylic acid, an acrylic acid-methacrylic acid copolymer, or a polymaleic acid, (D) a hydroxyaromatic carboxylic acid, or (E) a nitrogen-containing aliphatic or aromatic organic polycarboxylic acid; -L is-COO <-> or-O <->; mR'x is an ammonium ion, sulfonium ion or phosphonium ion and H is a hydrogen ion (H +); r'is a C1-C30 hydrocarbyl group, x is 3 or 4, M is N, P or S; n is an integer from 2 to 30; b is an integer from 1 to 29, and c is an integer from 1 to 15. The incompletely onium salinized or incompletely salified initiator has high reaction activity and can be used for preparing carbon dioxide-based multi-arm polycarbonate with narrow molecular weight distribution, and the molecular weight is between hundreds of thousands and millions.
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