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Multilayer polyporous foam dressing material and its producing method

A microporous, foam technology, applied in viscous dressings, dressings, etc., can solve problems such as difficulty in wide use, inappropriate wounds, and complicated manufacturing processes

Inactive Publication Date: 2003-01-08
株式会社界优维
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the manufacturing process of this dressing is complicated, the price is expensive, and it is difficult to use it widely.
[0010] Summarize the above-mentioned problems of the original occlusive dressing: low absorption, wound adhesion, low physical properties, high price, etc., plus the defect that the wound with more pus is extremely unsuitable

Method used

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  • Multilayer polyporous foam dressing material and its producing method
  • Multilayer polyporous foam dressing material and its producing method

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 2

[0031] When producing polyurethane prepolymers with isocyanate end groups, use a 3-liter round-bottomed flask equipped with a stirrer to put 242.8g of toluene isocyanate (TDI), and after the humidity rises to 60°C, add a small amount of 3 hydroxyl groups, and ethylene oxide / propylene oxide random copolymer, TR-705 (Polyol company) 816.3g with ethylene oxide content of 75%, and polypropylene glycol GT-4000 ( Polyol company) 435.4g, manufacture through the chemical reaction of 7 hours, be 5.7 until reaching theoretical NCO content. Samples were taken during the reaction to measure the NCO content. At this time, use n-butylamine standard solution and measure according to the titration method. [Example 1]

Embodiment 1

[0032] The production process of the outer protective film is as follows. Put 18g of polyurethane elastomer into DMF / MEK (40 / 60) solvent, heat and stir at 60°C, and dissolve into a colorless and transparent polyurethane solution in a viscous liquid state. After sticking adhesive tape on its periphery, drip polyurethane solution on release paper made of silicon with a certain thickness, and then spread it evenly with a film coating machine to form a certain thickness, then dry it in an oven at 100°C for one hour. many hours. The film thicknesses after drying were 15, 30, and 50 μm, respectively. [Example 2]

Embodiment 2

[0033] The manufacturing process of the hydrophilic polyurethane foam dressing is as follows. 27.2% by weight of distilled water as a foaming agent, 13.6% by weight of glycerin as a crosslinking agent, and 0.5% by weight of F-127 (BASF Corporation) as an additive were added to 57.1% by weight of the polyurethane prepolymer produced in Synthesis Example 1 above. %, 0.9% by weight of L-64, 0.5% by weight of sodium alginate, after stirring for 5 seconds at 4000rpm, stick the polyurethane film with a thickness of 15 μm made in Example 1 on the molding side, and then inject it into a certain In the mold of the shape, the final foam is made. At this time, the temperature of the mold is 35°C, and it is opened after 10 minutes of injecting the liquid, and the density of the prepared dressing is 0.21g / cm 3 .

[0034] The hydrophilic polyurethane foam dressing thus obtained was measured for its physical properties according to the following methods, and the above measurement results a...

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Abstract

The present invention relates to a multimicroporous foamed dressing with multilayer structure and its preparation method. The thickness of said dressing is 1-7 mm, and its structure contains the following three layers: first layer is outside protective film layer whose thickness is 10-90 micrometer, second layer is internal absorption foamed layer with several holes whose diameter is 80-400 micrometer and third layer is wound-contacting layer with several microfine pores whose average diameter is below 60 micrometer, and its thickness is 0.1-200 micrometer. Its preparation process is simple and includes the following steps: firstly, mixing 40-75 wt% of polyurethane prepolymer, 15-45 wt% of foaming agent, 5-35 wt% of cross-linking agent and 0.5-15wt% of additive containing surfactant, humectant, releasing agent, bactericide and pigment, stirring them, injecting them into mould, foaming and moulding.

Description

technical field [0001] The invention relates to a foam dressing (Dressing Aand) used for an occlusive wet dressing and a manufacturing method thereof. Its structure is three layers: the first is the outer protective film layer 1 with a thickness of 10-90 μm, the second is the inner absorbent foam layer 2 containing most open-cells with a diameter of 80-400 μm, and the third is the wound The contact layer 3 is a film having a thickness of 0.1 to 200 μm, and this film has many fine pores with an average diameter of 60 μm or less. This kind of foam dressing with multi-layer structure has a high absorbency of 500-3,000% by weight and a relative humidity of 10-100% at 37.5°C, and has a density of 500-3000g / m 2 / 24hrs high moisture permeability, also can prevent the external leakage of pus. Background technique [0002] The skin has important functions such as protecting the body, regulating body temperature, preventing bacterial infection, perception, and secretion. If various ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61F13/02B29C44/00B29C44/36
Inventor 朴明焕李寿昌金炫廷姜鲜爱
Owner 株式会社界优维
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