Composition of air-permeable film with low permeation volume and preparation method thereof

Abstract

The invention discloses a composition of an air-permeable film with a low permeation volume. The composition consists of the following components in percentage by weight: 30-60 percent of polyolefin resin mixture, 5-15 percent of permeation volume regulator, 30-55 percent of surface-modified nano-grade organic particles, 0.2-0.5 percent of antioxidant, 0.1-2.0 percent of lubricant and 1-3 percent of coupling agent. A preparation method of the composition comprises the following steps of: mixing a micro-grade inorganic filler with the coupling agent in a high-speed mixer to obtain a pretreated filler; feeding the pretreated filler, polyolefin resin, a modifier, the antioxidant and the lubricant into a double screw extruder by using a feeding system, extruding, cooling, pelletizing, drying, and packaging with an aluminum film bag in vacuum to obtain a finished air-permeable film composition with low permeation volume; and casting the prepared composite by using an extruder with a T-shaped film head, and stretching with a single shaft in two steps, wherein the stretching rate is 0.5-3.5. The invention has the advantages: 1, the nano inorganic filler is added, so that the mechanical property of the air-permeable film can be enhanced; 2, the surface of the inorganic particles is coupled, so that the compatibility with the polyolefin resin can be enhanced; 3, due to the adoption of the T-shaped film head, the drawing efficiency and the flatness can be fully enhanced; and 4, due to the adoption of the permeation volume regulator, the permeation volume of the air-permeable film can be lowered remarkably.

Description

technical field [0001] The invention relates to a polyolefin composition of a low-air-permeable air-permeable film, and provides a preparation method of the low-air-permeable air-permeable film. Background technique [0002] Breathable film is a kind of polymer filled with a certain proportion of mineral fillers, which forms a controllable size gap around the filler, which allows water vapor, air and other gases to pass through, but does not allow liquids to pass through. It is mainly used for the production of baby diapers, women's hygiene Products such as towels, medical protective clothing, and heating and cooling packs (heating patches). Its production method is to stretch the breathable film composite particles after casting or blow molding. During the stretching process, the polymer is stretched and the inorganic particles added to it cannot be stretched, thus producing micropores that can pass through. The micropores of water vapor, because of the relatively small di...

AI Technical Summary

Problems solved by technology

But its disadvantage is that the compatibility of nanoparticles and polyolefin resin is poor, which will cause uneven air permeability of the material and affect the use.

The advantage is that the macromolecular dispersant or polymer dispersant is mixed with the filler in advance to avoid incompatibility when pulling the film, but its dispersion performance is still not ideal

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