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A kind of breathable composite film and preparation method thereof

A composite film and air permeability technology, applied in the field of breathable composite film and its preparation, can solve the problems affecting the air permeability uniformity of the film material, the small structure of the polypropylene hydrocarbon film, the harm to the human body and the environment, etc. Small size and improved hydrophilicity

Active Publication Date: 2019-06-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its advantage is that the nano-micron inorganic filler can improve the mechanical properties of the breathable film, and the surface coupling modified inorganic particles increase the compatibility with the polyolefin matrix resin, but the disadvantage is that the high addition amount (30%-55% ) micron inorganic particles can not be well dispersed in the matrix resin, thus affecting the air permeability uniformity of the film material
Its advantage is that the polypropylene hydrocarbon film prepared by the traditional wet method has a small structure and a large number, but it adopts a two-step extraction process with a high volume percentage concentration, and the extraction solvent is N, N'-dimethylformamide, dichloro Methane, chloroform, etc. are highly polluting and toxic solvents, which can cause great harm to the human body and the environment

Method used

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  • A kind of breathable composite film and preparation method thereof
  • A kind of breathable composite film and preparation method thereof
  • A kind of breathable composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) 3.2kg concentration is 25g / L micronanocrystalline soybean seed coat cellulose aqueous dispersion liquid (particle diameter is 50nm-2 μ m) and 6g silane coupling agent KH580 in high-speed disperser (1000rpm), disperse again Add 300g dispersant polyethylene glycol PEG-200 and mix homogeneously in a high-speed mixer (1000rpm), and dry the mixture in an oven to obtain a pretreatment filler;

[0037] (2) 500g linear low density polyethylene (LLDPE), 100g ethylene-acrylate-glycidyl methacrylate (GMA), pretreatment filler, 4g phenolic 264 and phosphite BHT antioxidant, 10g lubricant Agent calcium stearate is premixed by high-speed mixer (1000rpm), gets premixed material;

[0038] (3) The premixed material is added to the feed port of the extruder through a metering feeder, melted and extruded by a co-rotating twin-screw extruder, cooled and granulated to obtain a finished gas permeable composite film composition. The aspect ratio of the twin-screw extruder used in the abo...

Embodiment 2

[0044] (1) Disperse 2.5kg of microcrystalline cotton cellulose aqueous dispersion (particle size: 500nm-10μm) with a concentration of 20g / L and 10g of silane coupling agent KH550 in a high-speed disperser (1000rpm), and then add the dispersant 225g Polyethylene Glycol PEG-400 is mixed in high-speed mixer (1000rpm), and its mixture is dried in baking oven and obtains pretreatment filler;

[0045] (2) 600g low-density polyethylene (LDPE), 100g ethylene-propylene copolymer (EPM), pretreatment filler, 4g hindered phenolic antioxidant 1010, 10g lubricant zinc stearate are passed through high-speed mixer (1200rpm) Perform premixing to obtain premixed materials;

[0046] (3) The premixed material is added to the feed port of the extruder through a metering feeder, melted and extruded by a co-rotating twin-screw extruder, cooled and granulated to obtain the air-permeable composite film composition pellets. The aspect ratio of the twin-screw extruder used in the above process is 40, t...

Embodiment 3

[0051] (1) Disperse 0.5 kg of microcrystalline hemp cellulose aqueous dispersion (with a particle size of 2 μm-50 μm) and 2 g of silane coupling agent KH590 in a high-speed disperser (1000 rpm) evenly, and then add the dispersant 150g polyethylene glycol PEG1000 is mixed homogeneously in high-speed mixer (1000rpm), and its mixture is dried in baking oven and obtains pretreatment filler;

[0052] (2) 700g high-density polyethylene (HDPE), 120g ethylene-octene copolymer (POE), pretreatment filler, 7g hindered phenolic antioxidant 1076 and 1g lubricant low-molecular PE wax are passed through a high-speed mixer (1200rpm ) for premixing;

[0053] (3) The premixed material is added to the feed port of the extruder through a metering feeder, melted and extruded by a co-rotating twin-screw extruder, cooled and granulated to obtain a finished gas permeable composite film composition. The aspect ratio of the twin-screw extruder used in the above processing process is 50, the screw spee...

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Abstract

The invention discloses an air-permeable composite film and a preparation method thereof. The air-permeable composite film is prepared from the following components by weight percent: 60%-82% of a polyolefin resin polymer, 2%-8% of micro-nanocrystalline cellulose particles, 0.4%-1% of an antioxidant, 15%-30% of a dispersing agent, 0.1%-0.5% of a lubricating agent and 0.2%-1% of a coupling reagent. The preparation method comprises the following steps: uniformly dispersing a micro-nanocrystalline cellulose aqueous dispersion and a coupling reagent; adding the dispersing agent, uniformly mixing and drying, thereby obtaining a pretreated padding; adding the obtained pretreated padding, polyolefin resin, antioxidant and lubricating agent into a twin-screw extrusion machine; melting and extruding, cooling and pelletizing, thereby obtaining the air-permeable composite film compound; hotly rolling, thereby preparing a smooth film; immerging into a cleaning agent, ultrasonically treating and drying; and bi-directionally stretching and performing thermoforming treatment, thereby obtaining the air-permeable composite film. The air-permeable composite film has efficient air permeability and excellent mechanical properties.

Description

technical field [0001] The invention relates to the field of composite films, in particular to a breathable composite film and a preparation method thereof. Background technique [0002] Cellulose is the most abundant natural renewable polymer compound in nature. Products based on cellulose are widely used in fuel ethanol, papermaking, permeable membranes, plastics, electronic products, medical engineering, electrical engineering, and industrial processing. , has excellent characteristics such as environmental protection and degradability, good thermal stability, high chemical stability, and high dielectric constant. In recent years, a large number of researchers have devoted themselves to modifying and strengthening cellulose to prepare high-performance film materials, mainly used for filtration, permeable membranes and lithium battery separator materials. The traditional gas permeable film is a polymer film filled with a certain amount of inorganic particle filler. When s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08L23/06C08L1/04C08L71/02C08K5/06
CPCC08J5/18C08J2323/06C08J2323/08C08J2423/08C08L23/06C08L23/0815C08L2203/16C08L2205/03C08L2207/062C08L2207/066C08L23/0884C08L1/04C08K5/06C08L71/02
Inventor 丁恩勇徐宁
Owner SOUTH CHINA UNIV OF TECH
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