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Moisture permeation, ventilation and high hydrostatic pressure breathable film and preparation method thereof

A technology of hydrostatic pressure and breathable membrane, which is applied to flat products, other household appliances, applications, etc. It can solve the problems of high moisture permeability of breathable membranes, high air permeability and high hydrostatic pressure cannot coexist, and achieve excellent physical properties and uniform moisture permeability , High resistance to external pressure effect

Inactive Publication Date: 2020-01-21
山东恒鹏卫生用品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention realizes the improvement of the micropore path through the raw material formula and the dosage of each raw material, and cooperates with three-layer co-extrusion, so that the gas-permeable membrane has countless intercommunicating micropores, and the micropores can pass through water vapor molecules with small particle diameters. Water droplets or other liquid droplets with large particle sizes cannot pass through, so that the product has excellent moisture permeability and air permeability under the premise of excellent high hydrostatic pressure performance; through the cooperation of upper traction and MDO stretching steps, the product can be moisture permeable , The air permeability is further improved, which solves the problem that the existing air-permeable membranes cannot coexist with high moisture permeability, high air permeability and high hydrostatic pressure

Method used

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  • Moisture permeation, ventilation and high hydrostatic pressure breathable film and preparation method thereof
  • Moisture permeation, ventilation and high hydrostatic pressure breathable film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: the preparation of breathable film

[0030] The method comprises the following steps: (1) uniformly feeding the raw materials metallocene linear low-density polyethylene, linear low-density polyethylene and calcium carbonate fine powder with a particle size of 2 μm respectively using a feeder; the raw materials are calculated by weight percentage : Metallocene linear low density polyethylene is 5%, linear low density polyethylene is 10%, breathable material is 85%;

[0031] (2) The mixture is extruded through a three-layer co-extrusion and melted, and then extruded through a die, wherein the screw temperature on both sides is 185°C, the middle screw temperature is 190°C, and the die head temperature is 190-200°C;

[0032] (3) Cooling after blowing the film to form a film bubble; when blowing the film, it is blown by cold wind, and the temperature of the cold wind is 12-18°C; cooling is carried out at a room temperature of 20-25°C by air flow;

[0033] (4)...

Embodiment 2

[0036] Embodiment 2: the preparation of breathable film

[0037] The method comprises the following steps: (1) uniformly feeding the raw materials metallocene linear low density polyethylene, linear low density polyethylene and calcium carbonate fine powder with a particle size of 5 μm respectively using a feeder; the raw materials are calculated by weight percentage : Metallocene linear low density polyethylene is 15%, linear low density polyethylene is 15%, breathable material is 70%;

[0038] (2) The mixture is extruded through a three-layer co-extrusion and melted, and then extruded through a die, wherein the screw temperature on both sides is 185°C, the middle screw temperature is 190°C, and the die head temperature is 190-200°C;

[0039] (3) Cooling after blowing the film to form a film bubble; when blowing the film, it is blown by cold wind, and the temperature of the cold wind is 12-18°C; cooling is carried out at a room temperature of 20-25°C by air flow;

[0040] (4...

Embodiment 3

[0043] Embodiment 3: the preparation of breathable film

[0044] The method comprises the following steps: (1) uniformly feeding the raw materials metallocene linear low-density polyethylene, linear low-density polyethylene and calcium carbonate fine powder with a particle size of 2 μm respectively using a feeder; the raw materials are calculated by weight percentage : Metallocene linear low density polyethylene is 20%, linear low density polyethylene is 20%, breathable material is 60%;

[0045] (2) The mixture is extruded through a three-layer co-extrusion and melted, and then extruded through a die, wherein the screw temperature on both sides is 185°C, the middle screw temperature is 190°C, and the die head temperature is 190-200°C;

[0046] (3) Cooling after blowing the film to form a film bubble; when blowing the film, it is blown by cold wind, and the temperature of the cold wind is 12-18°C; cooling is carried out at a room temperature of 20-25°C by air flow;

[0047] (4) ...

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Abstract

The invention discloses a preparation method of a moisture permeation, ventilation and high hydrostatic pressure breathable film. The preparation method of the moisture permeation, ventilation and high hydrostatic pressure breathable film includes following steps: (1) mixing raw materials to obtain a mixed material, wherein the raw materials are mixed according to the following weight percentage:5-20% of metallocene linear low density polyethylene, 10-20% of linear low density polyethylene and 60-85% of breathable material; (2) after extruding and fusing the mixed material through three-layerco-extrusion, extruding the mixed material from a mold head, wherein temperature of a screw is 180-200 DEG C, and temperature of the mold head is 190-200 DEG C; (3) after forming film buckles throughfilm blowing, performing cooling; (4) performing upward traction on the film buckles, wherein traction speed is 20m / min; (5) performing MDO (machine direction orientation) stretching on a film, setting heating temperature of the MDO stretching at 95 DEG C, completing 4-5 times of stretching through a stretching roller, and forming the breathable film; and (6) preforming corona treatment. The preparation method of the moisture permeation, ventilation and high hydrostatic pressure breathable film solves the puzzle that high moisture permeability, high breathability and high hydrostatic pressurecannot coexist in an existing breathable film.

Description

technical field [0001] The invention relates to the technical field of polymer breathable membranes, in particular to a breathable membrane with moisture permeability, air permeability and high hydrostatic pressure and a preparation method thereof. Background technique [0002] A breathable film is a film that allows air and gas to pass through, but can block liquids like water. It is a functional material, also known as "Breathable-Film", which is usually used in occasions that require both breathability and waterproof. At present, breathable membranes are widely used in health, medicine, construction, automobile and sports industries, and the products produced by them involve baby diapers, adult incontinence pants, nursing products and women's hygiene products; medical protective products, hospital anti-allergic bedding; protective clothing, work clothing and their lining materials; roof protection materials and breathable waterproof materials, etc. [0003] In recent ye...

Claims

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Application Information

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IPC IPC(8): B29C48/21B29C48/00C08L23/08C08K3/26C08J5/18B29L7/00
CPCB29L2007/00B29C48/0017B29C48/0018B29C48/21C08J5/18C08J2323/08C08J2423/08C08K2003/265C08K2201/003
Inventor 王玉梅赵培磊邓林林蔡源孙文强马德勋张志毅
Owner 山东恒鹏卫生用品有限公司
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