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Anti-fog SPEEK/PE controlled atmosphere composite film with high separation performance, and preparation method and applications thereof

A technology with high separation and anti-fogging properties, applied in the field of modified atmosphere membranes, it can solve the problems of low efficiency of modified atmosphere membranes and few patents of SPEEK modified atmosphere composite membranes, and achieve low cost, high separation and good moisture permeability. Effect

Active Publication Date: 2019-10-15
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned patents are related to SPEEK atmosphere-modified membranes, the efficiency of oxygen and carbon dioxide permeation of the atmosphere-modified membranes is not high, and there are few patents on SPEEK-modified atmosphere composite membranes

Method used

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  • Anti-fog SPEEK/PE controlled atmosphere composite film with high separation performance, and preparation method and applications thereof
  • Anti-fog SPEEK/PE controlled atmosphere composite film with high separation performance, and preparation method and applications thereof
  • Anti-fog SPEEK/PE controlled atmosphere composite film with high separation performance, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Take a certain mass (about 1KG) of low-density PE pellets, use a small single-screw extruder to extrude low-density PE, and blow it into a film. Extrusion conditions: the extrusion speed is 20rpm, the traction speed is 5rpm, the temperature range is 160°C, the thickness of the obtained PE film is about 20μm, and the film size is about 10*15cm.

[0040] (2) Take the SPEEK polymer with a sulfonation degree of 0.25, soak it in clean water, wash it, and fully remove the water after drying. Dissolve the SPEEK polymer in N,N-dimethylformamide (DMF) at a constant temperature of 40°C. ), stirring constantly to dissolve SPEEK completely and obtain a homogeneous polymer solution. And the SPEEK polymer solution was centrifuged at 4000r / min for 15min, and the upper layer solution was taken for ultrasonic defoaming. Then, on the basis of extrusion blown low-density PE film, a certain amount of SPEEK polymer solution is evenly coated on the surface of the PE film. By adjusting ...

Embodiment 2

[0043] (1) Take a certain mass (about 2KG) of low-density PE pellets, extrude the low-density PE with a small single-screw extruder, and blow it into a film. Extrusion conditions: the extrusion speed is 50rpm, the traction speed is 10rpm, the temperature range is 180°C, the thickness of the obtained PE film is about 25μm, and the film size is about 10*15cm.

[0044] (2) Take the SPEEK polymer with a sulfonation degree of 0.46, soak it with clean water, wash it, and fully remove the water after drying. Dissolve the SPEEK polymer in N,N-dimethylformamide (DMF) at a constant temperature of 40°C. ), stirring constantly to dissolve SPEEK completely and obtain a homogeneous polymer solution. And the SPEEK polymer solution was centrifuged at 4000r / min for 15min, and the upper layer solution was taken for ultrasonic defoaming. Then, on the basis of extrusion blown low-density PE film, a certain amount of SPEEK polymer solution is evenly coated on the surface of the PE film. By adjus...

Embodiment 3

[0047] (1) Take a certain mass (about 2KG) of low-density PE pellets, extrude the low-density PE with a small single-screw extruder, and blow it into a film. Extrusion conditions: the extrusion speed is 60rpm, the traction speed is 20rpm, the temperature range is 185°C, the thickness of the obtained PE film is about 25μm, and the film size is about 10*15cm.

[0048] (2) Take the SPEEK polymer with a sulfonation degree of 0.76, soak it with clean water, wash it, and fully remove the water after drying. Dissolve the SPEEK polymer in N,N-dimethylformamide (DMF) at a constant temperature of 40°C. ), stirring constantly to dissolve SPEEK completely and obtain a homogeneous polymer solution. And the SPEEK polymer solution was centrifuged at 4000r / min for 15min, and the upper layer solution was taken for ultrasonic defoaming. Then, on the basis of extrusion blown low-density PE film, a certain amount of SPEEK polymer solution is evenly coated on the surface of the PE film. By adjus...

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Abstract

The invention belongs to the field of controlled atmosphere film, and discloses an anti-fog SPEEK / PE controlled atmosphere composite film with high separation performance, and a preparation method andapplications thereof. The preparation method comprises following steps: low density PE particles are subjected to extrusion blow molding film forming so as to obtain PE film, the PE film is uniformlycoated with a DMF solution of SPEEK through scraping coating, drying is carried out, and the anti-fog SPEEK / PE controlled atmosphere composite film with high separation performance is obtained aftercomplete volatilization of DMF solvent. The SPEEK material is excellent in gas permeability and separation performance, the PE material is low in cost and moisture permeability, so that the prepared anti-fog SPEEK / PE controlled atmosphere composite film is high in gas permeability and separation performance, and low in moisture permeability, and can be used in vegetable fresh keeping; and high research value and promising practical application prospect in solving of vegetable processing and fresh keeping common key technology problems, promoting domestic vegetable after-harvesting storage andtransportation technology system improvement, and accelerating fresh e-commerce development are achieved.

Description

technical field [0001] The invention belongs to the field of modified atmosphere membranes, and in particular relates to a highly separable anti-fog SPEEK / PE modified atmosphere composite membrane and its preparation and application. Background technique [0002] After fruits and vegetables are picked, organisms are still undergoing complex physical and physiological changes. During storage, anaerobic respiration produces ethanol, which accelerates the decay of fruits and vegetables; aerobic respiration consumes oxygen, exhales carbon dioxide, produces ethylene, and reduces moisture. In order to maximize the freshness of fruits and vegetables and prolong the ripening process, it is necessary to create low temperature, low oxygen, high carbon dioxide, sterile and other environments. my country is a veritable vegetable country, and its vegetable production and consumption rank among the top in the world. However, due to the strong seasonality of vegetables and the backwardne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08L23/06B01D53/22B01D67/00B01D69/12B01D71/26B01D71/38
CPCB01D71/26B01D71/38B01D69/12B01D53/228B01D67/0002C08J2323/06C08J7/0427
Inventor 肖凯军程瑶朱良申益何家鹏
Owner SOUTH CHINA UNIV OF TECH
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