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Preparation method of thermoplastic polyurethane porous membrane

A technology of thermoplastic polyurethane and porous film, which is applied in medical science, bandages, absorbent pads, etc. It can solve the problems of limited application range, uneven internal pore structure, film moisture permeability, air permeability and water absorption performance, etc., to achieve hand feeling The effect of comfort, good application prospects, and good biocompatibility

Pending Publication Date: 2020-05-05
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the thermoplastic polyurethane porous film obtained by the non-solvent-induced phase separation method has a dense skin layer and an uneven internal pore structure, which has an impact on the moisture permeability, air permeability and water absorption performance of the film, which limits its application range.

Method used

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  • Preparation method of thermoplastic polyurethane porous membrane
  • Preparation method of thermoplastic polyurethane porous membrane
  • Preparation method of thermoplastic polyurethane porous membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 5g of bio-based thermoplastic polyurethane with a hardness of 85A and 20g of N,N-dimethylformamide were uniformly mixed, dissolved, filtered, and defoamed under heating and stirring at 65°C to obtain a bio-based thermoplastic polyurethane casting solution; Cast on a glass plate, use a scraper to make a 350 μm thick film, and place it in an air humidity environment of 70% for 20 seconds, and put it in an ethanol coagulation bath with a temperature of 25°C, 35°C, 45°C, and 55°C Soak for 20 minutes, take out the film, soak it in deionized water for 1 hour, take it out and bake it at 40°C for 3 hours to obtain a thermoplastic polyurethane porous film. The porosity of the obtained film was 56.4%. As the temperature of the coagulation bath increased, the uniformity of the internal pore structure of the film was improved, and the moisture permeability and mechanical properties were improved. The porosity of the obtained film did not change much, and the average porosity was 56...

Embodiment 2

[0035] 5 g of bio-based thermoplastic polyurethane with a hardness of 85A, 20 g of N,N-dimethylformamide, and 1.25 g of polyethylene glycol (Mn2000) were uniformly mixed, dissolved, filtered, and defoamed at 65°C to obtain bio Base thermoplastic polyurethane film casting solution; cast it on a glass plate, scrape it with a scraper to make a 350μm thick film, and place it in an air humidity environment of 70% for 20s, and put it in the temperature of 25°C, 35°C, 45°C ℃, 55℃ ethanol coagulation bath for 20min, take out the membrane, soak it in deionized water for 1h, take it out and bake it at 40℃ for 3h to get a thermoplastic polyurethane porous film. With the increase of coagulation bath temperature, the surface hole density of the film , The uniformity of the internal pore structure is improved, and the moisture permeability and mechanical properties are improved. The porosity of the obtained film did not change much with temperature, and the average porosity was 66.2%. When ...

Embodiment 3

[0037] 5 g of bio-based thermoplastic polyurethane with a hardness of 85A, 20 g of N,N-dimethylformamide, and 3.125 g of polyethylene glycol (Mn2000) were uniformly mixed, dissolved, filtered, and defoamed at 65°C to obtain bio Base thermoplastic polyurethane film casting solution; cast it on a glass plate, scrape it with a scraper to make a 350μm thick film, and place it in an air humidity environment of 70% for 20s, and put it in the temperature of 25°C, 35°C, 45°C ℃, 55℃ ethanol coagulation bath for 20min, take out the membrane, soak it in deionized water for 1h, take it out and bake it at 40℃ for 3h to get a thermoplastic polyurethane porous film. With the increase of coagulation bath temperature, the surface hole density of the film , The uniformity of the internal pore structure is improved, and the moisture permeability and mechanical properties are improved. The porosity of the film obtained varies little with the temperature of the coagulation bath, and the average po...

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Abstract

The invention discloses a preparation method of a thermoplastic polyurethane porous membrane. The method can be used for preparing thermoplastic polyurethane porous membranes with different pore structures, and the porosity and water vapor permeability of a thermoplastic polyurethane porous membrane are controlled by controlling the content of a pore-foaming agent and coagulating bath. The methodcomprises the following steps: dissolving thermoplastic polyurethane or thermoplastic polyurethane and a pore-forming agent in a solvent, scraping a membrane on a flat plate by using a scraper, soaking the membrane in a coagulating bath at different temperatures to cause phase separation, and soaking the membrane in running water to wash out the residual solvent and pore-forming agent, thereby obtaining the thermoplastic polyurethane porous membrane. The preparation method is simple and convenient to operate, thermoplastic polyurethane porous membranes with different water vapor transmission rates and porosities can be prepared as required, and the thermoplastic polyurethane porous membranes have good mechanical properties, biocompatibility and chemical stability, can be applied to the fields of medical dressings, fabrics, leather and the like, and have good application prospects.

Description

technical field [0001] The invention belongs to the field of membrane engineering and science and technology, and in particular relates to a preparation method of a thermoplastic polyurethane porous membrane. Background technique [0002] Bio-based degradable thermoplastic polyurethane (TPU) has excellent mechanical properties, chemical stability, good biocompatibility and degradability. It has a wide range of applications in biomedicine, such as medical dressings, catheters, artificial blood vessels and heart valves. TPU can be prepared into a porous membrane structure by phase separation, electrospinning process, foaming or 3D gel printing. Porous TPU films are widely used in wound dressings, tissue engineering scaffolds, and separation membranes due to their good mechanical properties and adjustable porous structure. Due to its degradability and the excellent performance of traditional TPU, bio-based thermoplastic polyurethane materials can be widely used in the medical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J9/26C08J5/18A61L15/26A61L15/42A61L15/62C08L75/04
CPCC08J9/28C08J9/26C08J5/18A61L15/26A61L15/425A61L15/62C08J2375/04C08J2201/0422C08L75/04
Inventor 翟文涛伍旭奕
Owner SUN YAT SEN UNIV
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