Functional film for preventing ammonia gas from escaping in composting process and preparation method of functional film

Abstract

The invention belongs to the technical field of functional membranes and preparation thereof, and discloses a functional membrane for preventing ammonia gas from escaping in a composting process and a preparation method of the functional membrane. According to the functional membrane, a polyester fiber oxford fabric or a non-woven fabric with high yarn weaving density is selected as a first defensive line of the fabric layer and is used for protecting a second layer of polymer membrane, so that the membrane is prevented from being worn; an expanded polytetrafluoroethylene film with proper thickness and smaller pore diameter and the like are selected to improve the waterproof and air-permeable performance; activated carbon non-woven fabric capable of adsorbing gaseous ammonia molecules of unformed hydrogel liquid water drops is selected as an adsorption layer, and the adsorption layer is prepared through a gluing and hot-pressing composite technology. The functional film can adsorb a small amount of ammonia gas escaped along with water vapor and other gases, so that the ammonia resistance of the functional cover film is further improved. The membrane preparation process of the functional membrane is used for secondarily blocking ammonia molecules which are not dissolved in liquid water, so that the ammonia escape rate is further reduced. The functional film is suitable for preventing ammonia gas from escaping in the fields of stale garbage treatment and soil remediation.

Description

technical field [0001] The invention belongs to the technical field of functional film and its preparation, and in particular relates to a functional film for blocking the escape of ammonia gas in the composting process and a preparation method thereof. Background technique [0002] Garbage, a misplaced resource, is gaining more and more attention. Composting technology, as the mainstream waste treatment technology at home and abroad, not only makes up for many shortcomings of the current waste treatment methods, but at the same time, studies have shown that the decomposed products after composting various wastes have high nutritional content, loose texture, and no harmful effects. It is very suitable for urban landscaping and agricultural use, and has very good development prospects. [0003] Membrane Cover Technology (MCT for short), as the technical core of modern composting technology, is a research topic that many researchers in related research fields pay more attenti...

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Problems solved by technology

[0004] Although the film covering technology plays a role in blocking odor during the composting process, the existing research shows that due to the limitation of the existing film making process, the micropore diameter of the functional covering film is 0.2um-2.0um, and the diameter of the blocking molecule is only The barrier effect of ammonia gas molecules of 0.365nm-0.38nm is still very limited; in addition, a part of ammonia gas that is not dissolved in liquid water and escapes with water vapor has not taken secondary barrier measures

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