Humic substances-based polymer system

B - Operations – Transporting – 22 – C

Patent

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B22C 1/22 (2006.01)

Patent

CA 2705827

A system for use in forming polymer compositions, including as a replacement for phenolic based resin systems, for instance, in preparing foundry molds. In a preferred embodiment, the system includes the use of a) a polyermizable hydroxyl-containing component comprising a humic substance (as can be provided by lignite), b) an isocyanate component, and c) a catalyst, and preferably amine catalyst, component adapted to catalyze the polymerization of a) and b). The system is optionally used as binder system in the presence of a filler, such as, in combination with a foundry aggregate such as sand. A polymer system of this invention can be substantially free of formaldehyde or phenol, and preferably contains little or no aromatic solvents.

L'invention concerne un système destiné à être utilisé dans la formation de compositions polymères, y compris en remplacement de systèmes à base de résine phénolique, par exemple, pour préparer des moules de fonderie. Dans un mode de réalisation préféré, le système comprend l'utilisation de a) un composant contenant de l'hydroxyle polymérisable comprenant une substance humique (telle que celle que peut fournir le lignite), b) un composant isocyanate, et c) un catalyseur, et de préférence un catalyseur amine, un composant adapté pour catalyser la polymérisation de a) et de b). Le système est facultativement utilisé en tant que système de liaison en présence d'une charge, en combinaison avec un agrégat de fonderie tel que du sable. Un système de polymère de cette invention peut être sensiblement exempt de formaldéhyde ou de phénol, et contient de préférence peu ou pas de solvants aromatiques.

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