Enzymatic hydrolysis lignin epoxy resin material formula and its preparation method

Abstract

The invention provides a raw material formula of enzymatic lignin epoxy resin and its preparation method. The formula is enzymatic lignin or its derivatives, bisphenol A compound, epichlorohydrin or its mixed solution with an organic solvent, and a catalyst , curing agent, filler; the preparation method is to add enzymatic lignin or its derivatives to epichlorohydrin solution or its mixed solution with organic solvent, stir and dissolve, then add catalyst and add curing agent or curing agent and filler at the same time The mixture is heated to complete the reaction, and the final reactant is evaporated under reduced pressure to remove excess epichlorohydrin or organic solvent to obtain a water-insoluble brown solid, which is washed with water and dried to obtain an enzymatic lignin epoxy resin. The enzymatic lignin used in this method is a natural polymer material extracted from wood chips, bamboo, and grass straw, which not only effectively utilizes biological resources but also can replace petrochemical raw materials. The enzymatic lignin epoxy resin prepared can be used for engineering materials, Adhesives, coatings or modifiers of polymer materials have broad application prospects.

Description

Technical field [0001] The invention relates to the comprehensive utilization of biomass resources and epoxy resin manufacturing, and more specifically to a preparation method using enzymatic hydrolysis of lignin and its derivatives as the main raw material of lignin epoxy resin. Background technique [0002] Previous research reports on the preparation of epoxy resins have used lignosulfonate as a raw material. However, lignosulfonate is extracted from traditional papermaking "black liquor", which not only contains high impurity content, but also plant The natural lignin in the raw material undergoes major structural changes after the alkali and sulfite cooking, and the chemical activity is significantly reduced. The preparation of epoxy resin must undergo complex acidification, phenol modification and other complex modification treatments and purification processes. Only by reacting with epichlorohydrin can the lignin epoxy resin be obtained, and it will have a large adverse ef...

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Problems solved by technology

[0002] There is a precedent for using lignosulfonate as a raw material in previous research reports on the preparation of epoxy resins, but lignosulfonate is extracted from traditional papermaking "black liquor", which not only contains high impurities, but also plants The natural lignin in the raw material undergoes major structural changes after cooking with alkali and sulfite, and its chemical activity is significantly reduced. The preparation of epoxy resin must undergo complex modification and purification processes such as acidification and phenolization modification. Then react with epichlorohydrin to get lignin epoxy resin, and it will have a greater adverse effect on the performance of epoxy resin

In addition, a new method of preparing epoxy resin from high boiling alcohol lignin prepared by high boiling alcohol solvent method has been studied. The preparation of epoxy resin from high boiling alcohol lignin has many improvements compared with using lignin sulfonate as raw material, but high boiling alcohol The solvent method process needs to use higher-priced high-boiling alcohols when preparing lignin, and the recovery of high-boiling alcohol solvents requires more energy

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