Preparation method of super-hydrophobic filter paper for oil-water separation

Abstract

The invention discloses a preparation method of super-hydrophobic filter paper for oil-water separation. The preparation method comprises the following steps: (1) uniformly mixing attapulgite clay and paper pulp to obtain mixed slurry, carrying out suction filtration on the mixed slurry, flattening, and airing to obtain filter paper containing the attapulgite clay; and (2) putting an open container filled with alkyl trialkoxysilane and the attapulgite-clay-containing filter paper prepared in the step (1) into a closed reactor with a condensing device, heating the closed reactor to promote the alkyl trialkoxysilane to volatilize to generate steam, carrying out hydrophobic modification on the attapulgite-clay-containing filter paper to obtain the super-hydrophobic filter paper, and recycling organic steam generated in the modification process through a condensing device. The preparation method is simple and environment-friendly, does not use an organic solvent, does not generate waste gas and waste liquid, and is easy for large-scale preparation of the super-hydrophobic filter paper. When the prepared super-hydrophobic filter paper is used for oil-water separation, oil-water separation can be repeatedly carried out for 500 times or above.

Description

technical field [0001] The invention belongs to the field of preparation of superhydrophobic materials, and relates to the preparation of superhydrophobic filter paper, in particular to a preparation method of superhydrophobic filter paper used for oil-water separation. Background technique [0002] All over the world, oil spills occur frequently, and industries such as crude oil exploitation, mechanical processing, and biochemical industry produce a large amount of oil-water mixture, which faces the problem of oil-water separation. The existing separation methods such as gravity separation, ultrasonic separation, centrifugal separation and other methods have long separation time and large equipment size, which will cause secondary pollution during the treatment process. Therefore, there is an urgent need to develop new efficient and green filter materials. Paper has the characteristics of low production cost, biodegradability, recyclability and good mechanical properties, ...

AI Technical Summary

Problems solved by technology

Chinese Patent Publication No. CN111549568A discloses a preparation method of superhydrophobic paper, which uses octadecylamine emulsion to mix with pulp, then adds tannic acid and aluminum chloride to react to form microcapsule modified paper pulp, and then flattens and dries to obtain superhydrophobic paper. Hydrophobic paper, the preparation process involves more reaction raw materials, and the process is more complicated

Chinese Patent Publication No. CN 107401086A discloses a method for preparing superhydrophobic paper. The preparation method includes processes such as primary spraying, baking, and secondary spraying. The preparation is cumbersome, and there is pollution caused by solvent volatilization.

This method requires expensive plasma etching equipment and high production costs

Chinese Patent Publication No. CN 102808357A discloses a superhydrophobic paper and its preparation method. The method is to construct a modified nano-silica coating on the surface of the paper, but this method requires the use of organic solvents.

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