Method for synthesizing polyether amine

Abstract

The invention relates to a method for synthesizing polyether amine. The method comprises the following steps of: polymerizing epoxy ethane, epoxy propane or mixture thereof into polyether with different molecular weights; reacting the polyether with acrylonitrile under the catalytic action of sodium hydroxide or potassium hydroxide to prepare polycyanoarylether; and selectively hydrogenating carbon-nitrogen double bond in the polycyanoarylether by using a catalyst complex, wherein the catalyst complex is prepared by compounding a titanocene compound serving as a main catalyst, alkyl aluminum, alkyl lithium or an alkyl compound of another alkaline metal and an alkali earth metal serving as a first cocatalyst and a lewis base such as benzoic ether, siloxane and the like serving as a second cocatalyst; 0.05 to 0.2mmol of titanocene compound, 0.1 to 6mmol of alkyl metal compound and 0.01 to 0.4mmol of lewis base are used in every 100g of polymer; the hydrogenation is performed for 0.5 to 2.0 hours at a certain temperature under the hydrogen pressure; the degree of hydrogenation of a nitrile group in the polymer is over 98 percent; and the degree of hydrogenation of an ether bond is less than 1 percent. The method effectively solves the problem of side reaction of ether bond hydrogenation breakage brought by hydrogenating the conventional polycyanoarylether with raney nickel, and the yield of the polyether amine serving as the target product is over 90 percent.

Description

technical field [0001] The invention relates to a synthesis method of polyether amine, more specifically a method for obtaining polyether amine through selective hydrogenation of polyether nitrile. Background technique [0002] Polyetheramine is a tough curing agent for epoxy resin and soft segment component of polyurethane elastomer. Polyetheramine used as a curing agent for epoxy resin not only reduces the brittleness of the cured product, improves the flexibility of the cured product, but also overcomes the disadvantage of high toxicity of the simple polyamine curing agent. Polyether amine reacts with toluene diisocyanate to obtain polyurethane elastomer coatings for corrosion protection of various materials. [0003] The existing synthesis of polyether amine is divided into three steps. First, ethylene oxide, propylene oxide or their mixtures are used to polymerize polyethers of different molecular weights, and then polyether is reacted with acrylonitrile to obtain poly...

AI Technical Summary

Problems solved by technology

The curing agent of polyether amine used in epoxy resin not only reduces the brittleness of the cured product, but also improves the flexibility of the cured product, and overcomes the disadvantage of high toxicity of the simple polyamine curing agent.

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