Method for preparing nano amphoteric polyacrylamide additives

Abstract

The invention discloses a method for preparing a nano-amphoteric polyacrylamide accessory ingredient used for reclaiming sediment in paper making waste. The method comprises the steps as follows: Span80, Tween60, normal butyl alcohol and isooctane are added into a four-opening reaction bulb and are beaten for emulsification. AM, MA and DMDAAC monomers are mixed to get solution; a reducer which issodium bisulfite is added; subsequently, the solution is dropped into the four-opening reaction bulb; when the solution is heated to the initiation temperature, potassium persulfate is dropped; polymerization is initiated under the protection of N2. On completion of the reaction, heating, supply of N2 and beating are stopped; micro-emulsion is poured into an excessive dose of acetone for emulsionbreaking and settlement; the solution is filtered, washed with acetone and dried, thus getting the product; the product is preserved in a sealed container. The method solves the problems of the interference of small quantity of fiber remaining in the sediment of paper making waste, poor paper strength, anion waste on papermaking wet ends. By adopting the method, the sediment can be reclaimed and used in production as a paper making raw material. In addition, the method eliminates the secondary pollution caused by the sediment resulting from the traditional paper making waste processing technology.

Description

technical field [0001] The present invention relates to macromolecule chemical synthesis technology, in particular to a method for preparing a nano amphoteric polyacrylamide auxiliary agent used for recycling and utilizing sediment in waste paper and papermaking wastewater Background technique [0002] The paper industry is an important part of the national economy. Since 1992, my country's paper and cardboard production and total consumption have ranked third in the world, and the paper industry has developed rapidly. However, the physical and chemical treatment of waste paper and papermaking wastewater will produce a large amount of papermaking sediment. The characteristics of this type of sediment are: ① high water content (above 60%), in the state of sludge, and complex components. After passing through the cone sand remover, its composition is Fibers account for 74%, fine inorganic fillers account for 18%, and other inorganic components account for 8%. ②The physical p...

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Problems solved by technology

②The physical properties and structure of the fibers contained in it have been damaged to a certain extent. The fibers have shortcomings such as short fibers, poor strength, difficult to filter water, and high impurity content. It is difficult to adapt to the papermaking of today's high-speed paper machines. Anionic impurities, which will affect papermaking and paper performance in various ways

[0004] Because the total charge content of the sediment is 18.62mmol / 100g, the surface charge content is 6.11mmol / 100g, the demand for anions is 0.1871meq / g, and the demand for cations is 0.251meq / g; the fine components less than 100 mesh in the sediment account for 32.01% , the particle size of filler particles is generally 0.1-10 μm, and the particle size of other microfibers, non-fibrous fine substances, soluble polymers, etc. is less than 1-2 μm, and its specific surface area is about 0.6-600m 2 / g, and when a large amount of sediment is recycled, the fine components will make the slurry in a colloidal state as a whole, and the interaction between the surface and the colloid plays an important role. The traditional papermaking additives can no longer meet its high anion and cation requirements. Amount of additives and its requirements for small particle size and large specific surface area, large addition amount and poor effect, high cost of recycling sediment

Synthesizing a papermaking additive suitable for the recycling of sludge in waste paper and papermaking wastewater, and solving the problem of paper performance degradation caused by the reuse of fibers in sludge is of great significance for realizing the resource utilization of pollutants in papermaking wastewater

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