Polyurethane foam material and preparation method thereof, and application in wound dressing

A technology of polyurethane foam and water-based polyurethane, applied in the field of polyurethane foam materials, can solve problems such as unfavorable dressing replacement, difficult wound slough distinction and the like

Active Publication Date: 2020-07-03
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the calcium alginate sponge dressing obtained by this method will become gel and exist on the wound after absorbing the woun...

Method used

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  • Polyurethane foam material and preparation method thereof, and application in wound dressing
  • Polyurethane foam material and preparation method thereof, and application in wound dressing
  • Polyurethane foam material and preparation method thereof, and application in wound dressing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Add 90g to a precisely graduated 1L plastic beaker 3458, 30g of the above-mentioned synthetic nonionic aqueous polyurethane emulsion A, 6g STA, 1.2g SR, then use an egg beater to stir at a high speed at 1000rpm in an air atmosphere for 10min, to obtain a slurry with fluidity and rich foam, and no large cells greater than 1mm by visual inspection, and the volume of the aqueous polyurethane dispersion slurry rises to 550mL, the density of the foam slurry is 231.2g / L.

[0099] Add 12g of sodium alginate aqueous solution with a concentration of 2.5wt% to the above foam slurry, and stir evenly to obtain a foam slurry with a viscosity of 15000 cps. In order to detect the stability of the high-viscosity foam slurry, the height change of the slurry in the beaker before and after standing at room temperature for 10 minutes was recorded, and the results showed that the height of the foam slurry after standing for 10 minutes was 95% of the initial height.

[0100] Afterwards...

Embodiment 2

[0103] Add 68g to a precisely graduated 1L plastic beaker 3458, 40g 7396, 22g 5318, 6g STA, 1.2g SR, then use an egg beater to stir at a high speed at 1500rpm in an air atmosphere for 5 minutes to obtain a slurry with fluidity and rich foam, and there are no large cells greater than 1mm by visual inspection, and the volume of the aqueous polyurethane dispersion slurry rises to 560mL, the density of the foam slurry is 227.1g / L.

[0104] Add 6g of 5wt% sodium alginate aqueous solution to the above foam slurry, and stir evenly to obtain a foam slurry with a viscosity of 16500cps. In order to detect the stability of the high-viscosity foam slurry, the height change of the slurry in the beaker before and after standing at room temperature for 10 minutes was recorded, and the results showed that the height of the foam slurry after standing for 10 minutes was 91% of the initial height.

[0105] Afterwards, the above-mentioned viscous foam slurry was scraped onto a TPU film wi...

Embodiment 3

[0108] Add 45g to a precisely graduated 1L plastic beaker FD103, 40g 7396, 35g non-ionic water-based polyurethane emulsion A, 6g 188, 2.4g Brij721, and then use an egg beater to stir at 1500rpm in an air atmosphere at high speed for 5 minutes to obtain a fluid and foam-rich slurry, and there are no large cells larger than 1mm by visual inspection. At the same time, the water-based polyurethane dispersion slurry The volume rises to 530mL, then the density of the foam slurry is 240g / L.

[0109] Add 10 g of sodium alginate aqueous solution with a concentration of 2.5 wt % to the above foam slurry, and stir evenly to obtain a foam slurry with a viscosity of 12500 cps. In order to detect the stability of the high-viscosity foam slurry, the height change of the slurry in the beaker before and after standing at room temperature for 10 minutes was recorded, and the results showed that the height of the foam slurry after standing for 10 minutes was 87% of the initial height.

[0...

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Abstract

The invention discloses a polyurethane foam material and a preparation method thereof, and the application of the polyurethane foam material in wound dressing, wherein the polyurethane foam material is particularly suitable for being used as a wound dressing, can be produced in a safe, simple and convenient mode and is high in biological safety. The preparation method of the polyurethane foam material comprises the following steps: 1) mechanically foaming waterborne polyurethane dispersion slurry to form foam slurry; 2) adding a thickener aqueous solution, preferably a sodium alginate aqueoussolution, into the foam slurry, and uniformly stirring to obtain viscous foam slurry; 3) coating a base material with the slurry to obtain a complex; 4) applying a calcium chloride aqueous solution tothe surface, coated with the slurry, of the complex; and 5) drying the composite material obtained in the step (4) to remove water so as to obtain the foam material with a foam cell structure and a compact surface.

Description

technical field [0001] The invention relates to a polyurethane foam material obtained by mechanical stirring, drying and curing based on aqueous polyurethane dispersion and its application in wound dressing. Background technique [0002] Wound dressings are medical materials used to cover wounds, sores, etc. The polyurethane foam dressing can not only provide a constant temperature and humid microenvironment for the wound, but also has the advantages of good air permeability, non-adhesiveness, lightness and comfort, and is suitable for wounds with moderate to large amounts of exudate. Greater concern. [0003] Usually, polyurethane foam is prepared by "one-step method" using raw materials such as polyisocyanate, polyol, foaming agent, surfactant, crosslinking agent, catalyst, etc., but this method requires a long aging time and the monomers and The content of catalysts and the like is often high, which brings greater biosafety risks to actual medical applications. [0004...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L75/08C08L5/04C08G18/66C08G18/48C08G18/32C08G18/12C08K3/16A61L15/18A61L15/26A61L15/28A61L15/42A61L26/00
CPCC08J9/122C08G18/4812C08G18/12A61L26/0019A61L26/0023A61L26/0004A61L26/0085A61L15/26A61L15/28A61L15/18A61L15/425C08J2375/08C08J2405/04C08J2475/08C08K2003/162C08G18/3206C08G18/3228C08G18/3278C08L75/08C08L5/04
Inventor 雷琪尹金超邓俊英
Owner WANHUA CHEM GRP CO LTD
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