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Preparation method of breathable film for medical protective clothing

A gas-permeable membrane and membrane material technology, which is applied in the production of bulk chemicals, etc., can solve the problems of film transparency decrease and limit the application of PLA microporous membrane, and achieve uniform pore size distribution, high equipment pore formation efficiency, and high film intensity effect

Active Publication Date: 2021-07-09
BENSONG ENG PLASTICS HANGZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, although the addition of nanoparticles improves the cell structure of the PLA foam material, it will reduce the transparency of the film, which limits the application of PLA microporous membranes

Method used

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  • Preparation method of breathable film for medical protective clothing
  • Preparation method of breathable film for medical protective clothing
  • Preparation method of breathable film for medical protective clothing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A gas-permeable membrane for medical protective clothing, which is a PLA membrane layer, and micropores formed by supercritical carbon dioxide fluid are evenly distributed on the surface of the PLA membrane layer, which is conducive to improving the breathable and waterproof performance. The preparation method is as follows:

[0029] (1) Mixing extrusion casting of PLA resin raw material and supercritical gas: Add dry PLA pellets through the main feeding hopper 1 of the twin-screw extruder 8, and then add supercritical carbon dioxide fluid into the twin-screw extruder 2 through the metering pump 2. In screw extruder, sc CO 2 The volume of fluid used is 5% of the volume fraction of PLA pellets, sc CO 2 The pressure of the fluid is 20Mpa, the temperature of the screw from the barrel to the head of the extruder is 160-240°C, the screw speed is 200rpm / min, sc CO 2 After the fluid and PLA melt are fully mixed evenly through the shearing section, they enter the casting mouth...

Embodiment 10-11

[0039] Examples 10-11, Comparative Examples 2-3, changing the screw speed, and other parameters are the same as Example 8, the performance of the gas-permeable film is shown in Table 3. The screw speed is too small, sc CO 2 Fluid and PLA melt are mixed unevenly, resulting in large and uneven holes, resulting in a film that is not waterproof and cannot be used as a breathable film; the screw speed is too high, and the extruded film has shark skin disease, and a film with a smooth surface cannot be obtained.

[0040] table 3

[0041]

Embodiment 12-19 and comparative example 4-7

[0042] Examples 12-19 and Comparative Examples 4-7, the preparation method refers to Example 1, sc CO 2 The volume of fluid used is 10% of the volume fraction of PLA pellets, sc CO 2 The pressure of the fluid is 28, the temperature of the screw from the barrel to the head of the extruder is 160-240°C, and the screw speed is 200rpm / min. After the fluid and the PLA melt are fully mixed in the shearing section of the extruder, The melt metering section enters the mouth of the film, and the process parameters of other steps are shown in Table 4. The performance of the breathable film is shown in Table 5.

[0043] Table 4

[0044]

[0045]

[0046] table 5

[0047]

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Abstract

The invention discloses a preparation method of a breathable film for medical protective clothing, and relates to the technical field of microporous film preparation. The method comprises the following steps: mixing a PLA resin raw material and supercritical gas, then performing extrusion and casting; then forming holes by controlling the air pressure and temperature of a die orifice, and performing cooling, shaping and the like operations to prepare the transparent breathable film with a certain hole diameter. The process, being different from a traditional wet pore-forming process, has the advantages of high pore-forming efficiency of equipment, more uniform pore-forming aperture distribution, more regular pore shape and the like, wherein the more uniform aperture is beneficial to the transmittance control of the film, and the more regular pore shape can provide higher film strength.

Description

technical field [0001] The invention relates to the technical field of microporous membrane preparation, in particular to a preparation method of a breathable membrane for medical protective clothing. Background technique [0002] At present, disposable medical protective clothing mainly uses polyethylene / polypropylene spunbond nonwovens and breathable microporous films, or spunlace nonwovens and breathable microporous films, or wood paddles to spunlace nonwovens. Among them, the breathable microporous film is a key component of disposable protective clothing, which endows the protective clothing with the function of liquid and breathability, that is, "breathing". Its "three resistances and one resistance", liquid barrier performance and mechanical properties determine the comfort of protective clothing. and a key element of protection. [0003] The common disposable medical protective clothing breathable membranes in the domestic market are mainly polyethylene (PE) breatha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L67/04
CPCC08J9/122C08J2203/06C08J2203/08C08J2205/044C08J2367/04Y02P20/54
Inventor 刘振国张光辉
Owner BENSONG ENG PLASTICS HANGZHOU