A kind of preparation method and application of monodisperse alkali lignin molecular liquid

Abstract

The invention discloses a preparation method and an application of a monodispersed alkali lignin molecular liquid. The liquid alkali lignin molecular liquid is produced by adopting techniques of dissolving the lignin with alkali; precipitating silicon with carbon dioxide, removing impurities with calcium oxide, purifying by a nano-filtration membrane, thickening by reverse osmosis and catalytic cracking. The alkali lignin molecular liquid has high activity and no agglomeration, can be directly used as a reactant to participate in in-situ polymerization during a production process of polymer materials such as a urea resin, a phenolic resin and an epoxy resin. Artificial board adhesive prepared by using the lignin to replace 30-70 wt% of fossil raw materials still meets a standard GB / T14732-2006 (adhesive for wood processing) and meet strength requirements of type I plywood regulated in the standard GB / T14732-2006. The method and the application provided by the invention thoroughly overcome disadvantages of an alkali dissolution and acid precipitation method in a studying process of preparing and applying the lignin. Acid precipitation enables the lignin aggregating in particles state, greatly reducing the activity of the lignin, so that the lignin can only be used as an additive in the polymer materials. In the polymerization, the lignin prepared by the method is used as the reactant while the lignin prepared by the alkali dissolution and acid precipitation method is used as the additive, thereby being different completely in nature.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method and application of a monodisperse alkali lignin molecular liquid. Background technique [0002] Fossil resources are the material basis and energy source that people rely on for survival. All human activities and the steady development of society are inseparable from the use of fossil resources. However, with the rapid development of the world economy, the overexploitation and use of fossil resources has caused very serious consequences to people's living environment. Therefore, in today's world of increasingly scarce resources, deteriorating environment, political and economic disputes over resources, and even frequent armed conflicts and wars, all countries in the world regard the development of new energy and the utilization of renewable resources as an important strategic decision for their long-term development. [0003] Biomass is a kind of a...

AI Technical Summary

Problems solved by technology

However, the utilization rate of lignin produced as a by-product in the current biomass utilization process is only 1-2%, and most of it is discharged or burned as waste.