Preparation method of carboxylated lignin polymer-aminomethylated acrylamide copolymerization type amphoteric organic anti-dispersant agent

Abstract

The invention relates to a method for preparing an amphoteric organic anti-dispersion agent by using natural lignin and acrylamide. The phenolic hydroxyl on the lignin polymer is oxidized to carboxyl, and the acrylamide is reacted with formaldehyde and dimethylamine to obtain N,N'-dimethylmethylene acrylamide. Under the initiation of complex chain initiator, carboxylated lignin polymer and N,N'-dimethylmethylene acrylamide graft copolymerized to prepare carboxylated lignin polymer-aminomethylated acrylamide copolymerization type Amphoteric organic antidispersant. The invention uses the lignin high polymer to prepare the organic anti-dispersant agent, which reduces the amount of acrylamide used and the production cost; the concrete mixed with the amphoteric organic anti-dispersant agent has better fluidity, longer coagulation time and more efficient than the concrete mixed with polyacrylamide High resistance to water dispersion, above water, underwater compressive strength and underwater / above water compressive strength ratio. The carboxylated lignin polymer-amine methylated acrylamide copolymerized amphoteric organic anti-dispersant has broad application prospects.

Description

Carboxylated lignin polymer-amine methylated acrylamide copolymer amphoteric organic antioxidant Preparation method of dispersant technical field The present invention relates to the field of underwater concrete materials, be specifically related to a kind of system using natural lignin and acrylamide. A method for preparing a carboxylated lignin high polymer-amine methylated acrylamide copolymer-type amphoteric organic anti-dispersing agent. Background technique With the rapid development of modern industrial civilization, terrestrial resources have been unable to meet the needs of people's production and life. The development of marine resources began to move from the land to the sea, and countries around the world are increasingly concerned about the development and utilization of marine resources. more and more sea crossing Construction of marine structures such as bridges, harbour terminals, marine drilling platforms, and marine floating nuclear power plants be...

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Problems solved by technology

However, the amount of lignin currently used to prepare organic anti-dispersants for underwater concrete is only 10% of the total waste lignin, and a large number of lignin polymers have not been fully utilized and are still directly discharged as waste, resulting in waste of resources and pollution. surroundings

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