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SPEEK spontaneous asymmetric gas component adjustment film and its preparation method and use

A gas composition, asymmetric technology, applied in the field of membrane materials, can solve the problems of difficult film forming, insoluble, high melting point, etc., and achieve the effect of improving film forming conditions, low cost and high separation coefficient

Active Publication Date: 2017-02-08
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the stable nature of PEEK, it is difficult to dissolve in almost all solvents, and its melting point is very high, so it is difficult to process into a film
Therefore, the use of PEEK as a plastic wrap is greatly restricted

Method used

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  • SPEEK spontaneous asymmetric gas component adjustment film and its preparation method and use
  • SPEEK spontaneous asymmetric gas component adjustment film and its preparation method and use
  • SPEEK spontaneous asymmetric gas component adjustment film and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Take 200mL concentrated H 2 SO 4 and 10g of PEEK, stirred at 300r / min and 60°C for 5h to obtain a crude product, which was washed with 1000 times the mass of water, and then dried at 60°C for 24h to obtain sulfonated polyether ether ketone (SPEEK), with a yield of 13.2g, the degree of sulfonation (DS) is 62.3%;

[0040] (2) Add SPEEK to DMF after pulverization, magnetically stir at 60°C and 500r / min for 2h until completely dissolved, cool for later use, and obtain a casting solution with a concentration of 1g / 10mL;

[0041] (3) Cast the film casting solution obtained in step (2) on a clean glass plate to form a film with a film thickness of 50 μm, then put it in an oven and dry it at 60°C for 12 hours, cool it to room temperature naturally, and immerse it in distilled water at room temperature , taken out, and dried at room temperature to obtain the SPEEK spontaneous asymmetric gas composition adjustment membrane.

Embodiment 2

[0043] (1) Take 200mL concentrated H 2 SO 4 and 10g of PEEK, stirred at 300r / min and 60°C for 7h to obtain a crude product, washed with 1000 times the mass of water, and then dried at 60°C for 24h to obtain sulfonated polyether ether ketone (SPEEK), sulfonated Degree (DS) is 67.4%;

[0044] (2) Add SPEEK to DMF after pulverization, magnetically stir at 60°C and 500r / min for 2h until completely dissolved, cool for later use, and obtain a casting solution with a concentration of 1g / 10mL;

[0045] (3) Cast the film casting solution obtained in step (2) on a clean glass plate to form a film with a film thickness of 50 μm, then put it in an oven and dry it at 60°C for 12 hours, cool it to room temperature naturally, and immerse it in distilled water at room temperature , taken out, and dried at room temperature to obtain the SPEEK spontaneous asymmetric gas composition adjustment membrane.

[0046] The specific surface area of ​​the SPEEK spontaneous asymmetric gas composition a...

Embodiment 3

[0048] (1) Take 200mL concentrated H 2 SO 4 and 10g of PEEK, stirred at 300r / min and 50°C for 7h to obtain a crude product, washed with 1000 times the mass of water, and then dried at 60°C for 24h to obtain sulfonated polyether ether ketone (SPEEK), sulfonated The degree is (DS) 49.8%;

[0049] (2) Add SPEEK to DMF after pulverization, magnetically stir at 60°C and 500r / min for 2h until completely dissolved, cool for later use, and obtain a casting solution with a concentration of 1g / 10mL;

[0050] (3) Cast the film casting solution obtained in step (2) on a clean glass plate to form a film with a film thickness of 50 μm, then put it in an oven and dry it at 60°C for 12 hours, cool it to room temperature naturally, and immerse it in distilled water at room temperature , taken out, and dried at room temperature to obtain the SPEEK spontaneous asymmetric gas composition adjustment membrane.

[0051] The specific surface area of ​​the SPEEK spontaneous asymmetric gas compositi...

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Abstract

The invention belongs to the technical field of film materials and discloses a SPEEK spontaneous asymmetric gas component adjustment film and its preparation method and use. The preparation method comprises stirring PEEK and concentrated sulfuric acid at a temperature of 40-60 DEG C so that the materials undergo a reaction for 5-7h to produce a crude product, washing the crude product, drying the product to obtain SPEEK, dissolving the SPEEK in an organic solvent to obtain a membrane casting solution, forming a film on a flat plate from the membrane casting solution, drying the film, dipping the film in distilled water, taking out the film and drying the film to obtain the SPEEK spontaneous asymmetric gas component adjustment film. SPEEK has good dissolvability, greatly improves film forming conditions and reduces a film forming cost and technical requirements. The SPEEK film has good gas adjustment functions and can be used for fruit and vegetable fresh-keeping.

Description

technical field [0001] The invention belongs to the technical field of membrane materials, and in particular relates to a SPEEK spontaneous asymmetric gas component adjustment membrane and its preparation and application. Background technique [0002] The fresh-keeping storage methods of modern fruits and vegetables can be divided into three stages: the first is to use cellars and ventilation warehouses, which are relatively simple and primitive; the second method is to use mechanical refrigeration such as cold storage or refrigerated containers; Modified atmosphere preservation method. The modified atmosphere preservation method is therefore also known as the preservation method of the 21st century. Controlled atmosphere storage and preservation refers to storing fruits and vegetables in appropriate proportion of packaging according to the physiological characteristics and preservation needs of fruits and vegetables, so as to prolong their freshness period. This fresh-kee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08G8/02C08J5/18C08J9/28A23B7/148C08L61/16
CPCA23B7/148C08G8/02C08G8/28C08J5/18C08J9/28C08J2361/16
Inventor 肖凯军何其龚斌朱良易立中
Owner SOUTH CHINA UNIV OF TECH
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