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Polyurethane porous film and its preparing method

A technology of porous film and polyurethane, applied in the field of preparation of polyurethane porous film, to achieve the effects of improving physiological adaptability, preventing transitional loss, and low cost

Inactive Publication Date: 2004-12-15
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, considering the properties of the raw materials themselves, the film-making process, the control of the pore size and their influence on the moisture permeability and air permeability of the final film, there are relatively few studies at present.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add a stirrer and a thermometer to a 250ml four-necked bottle, add 30g PTMG-2000 (vacuum dehydration), 13.125g MDI, and react at 85±2°C for 2 hours under the protection of nitrogen to make a prepolymer; dissolve 3.375g BDO in In 69.8g of DMF, add the solution to the prepolymer under the protection of nitrogen, and react at 85±2°C for 1.5 hours to prepare a polyurethane solution. Add 15g ethylene glycol in this solution, dilute to 15wt% with DMF and make film-casting liquid; This film-casting liquid is poured on the glass mold, scrape evenly, place 30 seconds, immerse in the coagulation bath and coagulate for 8 minutes, again through Wash with water at 60°C, wash with water at 90°C, and finally dry and remove the film to obtain a film product. The film prepared by the method has a thickness of about 100um, an outer surface pore diameter of 5-10um, and an inner surface pore diameter of 30-40um. The tensile strength of the film is 20MPa, the elongation at break is 150%, a...

Embodiment 2

[0023] Use a 250ml four-necked bottle with a stirrer and a thermometer, add 16g of PTMG-1000 and 4g of PEG-1000 (vacuum dehydration), 12g of MDI, and react at 75±2°C for 3 hours under the protection of nitrogen to make a prepolymer; 2.52g of BDO Dissolve in 104g DMF, add the solution to the prepolymer under the protection of nitrogen, and react at 80±2°C for 1.5 hours to prepare a polyurethane solution. Dilute the solution to 15wt% with DMF to prepare the casting solution; pour the casting solution on the glass mold, scrape it evenly, let it stand for 30 seconds, put it into the coagulation bath to solidify for 10 minutes, and then wash it with water at 60°C and 90°C , and finally dried and stripped to obtain a film product. The film prepared by the method has a thickness of about 90um, an outer surface pore diameter of 5-10um, and an inner surface pore diameter of 30-40um. The tensile strength of the film is 13Mpa, the elongation at break is 300%, and the moisture permeabili...

Embodiment 3

[0025] Use a 250ml four-necked bottle with a stirrer and a thermometer, add 30g of PTMG-2000 (vacuum dehydration), 12g of MDI, and react at 85±2°C for 2 hours under the protection of nitrogen to make a prepolymer; mix 1.4g of BDO and 6.2g Hydroxy silicone oil was dissolved in 75g DMF, and the solution was added to the prepolymer under the protection of nitrogen, and reacted at 85±2°C for 1.5 hours to prepare a polyurethane solution. Dilute the solution to 20wt% with DMF to prepare the casting solution; pour the casting solution on the glass mold, scrape it evenly, let it stand for 30 seconds, immerse in the coagulation bath to solidify for 8 minutes, and then wash it with water at 60°C and 90°C , and finally dried and stripped to obtain a film product. The thickness of the film prepared by this method is about 110um, the pore diameter of the outer surface is 5-10um, and the pore diameter of the inner surface is 30-40um. The tensile strength of the film is 17Mpa, the elongatio...

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Abstract

The porous polyurethane film has thickness of 80-120 micron, tensile strength of 10-20 MPa, elongation at breaking of 100-350 %, pore size in the outer surface contacting with solidifying agent of 5-20 micron, pore size in the inner surface contacting with mold of 30-80 micron, humidity transmission rate of 900-1800 g / m in 2.24 hr, water absorption of 30-300 wt% and porosity of 40-100 %. Its preparation process includes two-step solution polymerization to synthesize polyurethane solution, adding proper solvent, core creating agent, etc. into the solution, diluting the solution into film forming liquid in certain concentration, and wet coating to form the film. The present invention has the advantages of simple technological process, low cost, compact outer surface of the film and loose and porous inner surface.

Description

Technical field: [0001] The invention belongs to a polyurethane porous film and a preparation method thereof, in particular to a preparation method of a polyurethane porous film whose pore size and moisture permeability meet the requirements of burn and wound coverage. Background technique: [0002] The benefits of creating a "moist healing environment" for wounds by covering them with occlusive, semi-occlusive dressings or coverings that form a gel over the wound have been recognized for many years. At present, it is generally believed that an ideal dressing should have the following characteristics: it can absorb a large amount of exudate and toxic substances; it can allow a certain amount of water vapor and oxygen to pass through; It is not easy to cause secondary trauma when dressing. Following the principle of moist wound healing, there are roughly three types of dressings manufactured by newly developed modern technologies: hydrogel, foam, and polyurethane film. Due ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L75/08
Inventor 王心葵亢茂青徐志磊赵雨花
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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