A kind of 1-ureido-2-hydroxypropyl vinylamine copolymer and its preparation method and application

Abstract

The invention discloses a 1-uramido-2-hydroxypropyl vinylamine copolymer, and a preparation method and application thereof. The preparation method comprises the following steps: putting an acrylamide monomer and distilled water into a reactor in an N2 protective atmosphere, adding a chain-transfer agent, a complexing agent and an initiator, stirring at 30-70 DEG C for 10-30 minutes, standing for 10-30 minutes, cooling to -10-15 DEG C, adding sodium hydroxide, stirring uniformly, slowly adding sodium hypochlorite, reacting for 1-3 hours, adding sodium hydroxide, reacting for 2-4 hours, heating to 50-90 DEG C, slowly and dropwisely adding an epoxy chloropropane-urea mixed solution, reacting for 2-5 hours, and cooling to normal temperature to obtain the 1-uramido-2-hydroxypropyl vinylamine copolymer. The 1-uramido-2-hydroxypropyl vinylamine copolymer is a light yellow thick liquid, the solid content is greater than or equal to 13%, the pH value is 9-10, the polymerization degree is 80-100, the amination degree is 60% or above, and the 1-uramido-2-hydroxypropyl vinylamine copolymer can be used as a paper reinforcer, paper sizing agent or flocculant. The method has the advantages of simple preparation technique, accessible production raw materials, short production cycle and mild reactions, is convenient for industrialized mass production, and has wide application prospects.

Description

technical field [0001] The invention belongs to the fields of fine chemicals, environment-friendly materials, papermaking additives and water treatment agents, and specifically relates to a 1-ureido-2-hydroxypropyl vinylamine copolymer and its preparation method and application. Background technique [0002] With the improvement of consumption level, people have higher and higher requirements for paper grade and quality. How to improve the strength of paper to meet people's needs is the direction that people have been studying. The traditional method is to increase the ratio of long fibers by beating and use reinforcing agents to enhance the strength of paper. Among them, there are many defects in the two methods of beating and the ratio of long fibers, such as large power consumption and low water drainage. , tearing becomes weaker, etc., and paper additives are favored by people because they do not have the above problems [1] . [0003] Paper sizing agents can improve th...

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Problems solved by technology

[0004] Starch additives are also one of the focus of people's research, but generally starch-based paper-making strengthening agents have limited improvement in the bonding area of ​​fiber molecules. Traditional sizing agent emulsions use cationic starch as emulsifier and stabilizer, but the effect of this type of emulsion on fibers Low retention rate, slow reaction with fiber, long sizing time [4,5] , moreover, starch reinforcing agent and sizing agent will also consume more food resources, the present invention mainly studies the technology and application of polyvinylamine as papermaking additive [6]

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