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Hydrophilic polyurethane pressure-sensitive adhesive and preparing method thereof

A hydrophilic polyurethane and hydrophilic technology, applied in polyurea/polyurethane adhesives, adhesives, pharmaceutical formulations, etc., can solve the problems of inability to guarantee the strength of pressure-sensitive adhesives, low degree of cross-linking, and impact on performance. Achieve good water absorption and air permeability, and improve the effect of water absorption and air permeability

Inactive Publication Date: 2003-11-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the degree of cross-linking of this pressure-sensitive adhesive is too low to ensure the strength required for pressure-sensitive adhesives for skin applications.
Moreover, the emulsifier is not easy to remove, which has a certain impact on the performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025]In a four-neck flask, add 64g of polytetrahydrofuran diol with a relative molecular mass of 2000, 4g of polyoxypropylene triol with a relative molecular mass of 1000, and 16g of polyethylene glycol with a relative molecular mass of 800, and seal it at 120°C. Water was removed by purging nitrogen for 1.5 hours. At 65°C, under normal pressure, 25.7 g of isophorone diisocyanate and 20 g of methyl ethyl ketone were added, and the mixture was reacted at 85°C for 4 hours. Then, 40 g of a butanone solution containing 3.48 g of ethylenediamine was added. React for 2 hours. The butanone solvent was removed under reduced pressure at 70°C, and the material was discharged. The crude product was moved to a vacuum drying oven, and dried for 24 hours at 100° C. and a vacuum degree of 0.1 MPa to obtain a polyurethane pressure-sensitive adhesive PSA1.

example 2

[0027] In a four-necked bottle, add 32g of polyoxypropylene diol with a relative molecular mass of 1000, 5g of polyoxypropylene tetraol with a relative molecular mass of 3000, and 20g of polyethylene glycol with a relative molecular mass of 1000. , nitrogen gas to remove water for 1.5 hours. At 65°C, under normal pressure, 20.78 g of isophorone diisocyanate and 20 g of methyl ethyl ketone were added, and the mixture was reacted at 85°C for 4 hours. Then, 25 g of a butanone solution containing 2.31 g of ethylenediamine was added to react for 2 hours. The butanone solvent was removed under reduced pressure at 70°C, and the material was discharged. The crude product containing a certain amount of solvent was moved to a vacuum drying oven, and dried at 100° C. for 24 hours under a vacuum degree of 0.1 MPa to obtain a polyurethane pressure-sensitive adhesive PSA2.

example 3

[0029] In a four-necked bottle, adding relative molecular mass is 2000 polybutadiene diol 64g, relative molecular mass is 2000 polyoxypropylene triol 4g, relative molecular mass is 800 polyethylene glycol 16g, seals back in 120 °C, blow nitrogen gas to remove water for 1.5 hours. At 65°C, under normal pressure, 18.34 g of isophorone diisocyanate and 20 g of butanone were added, and the mixture was reacted at 85°C for 4 hours. Then diethylenetriamine / butanone mixed solution (2.11 g of diethylenetriamine, 25 g of butanone) was added, and the reaction was continued for 2 hours. The butanone solvent was removed under reduced pressure at 70°C, and the material was discharged. The crude product was moved to a vacuum drying oven, and dried for 24 hours at 100° C. and a vacuum degree of 0.1 MPa to obtain a polyurethane pressure-sensitive adhesive PSA3.

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PUM

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Abstract

A pressure-sensitive hydrophilic polyurethane adhesive for medical purpose is prepared from diisocyanate through polycondensating with at least 3 kinds of macro-molecular polyol (polyethanediol or its derivative, hydrophobic macro-molecular biol, and macro-molecular polyol containing at least 3 hydroxy groups) to obtain prepolymer, and enlarging chain via low-molecular diamine or its polymer. Its advantages are good hydrophilicity, and good compatibility to skin.

Description

technical field [0001] The invention relates to a random block polyurethane copolymer pressure-sensitive adhesive and a preparation method thereof. The pressure-sensitive adhesive has good water absorption and air permeability, is comfortable to attach, and is suitable for use as a medical and medicinal pressure-sensitive adhesive. Background technique [0002] Until the 1950s, pressure-sensitive adhesives for skin were mainly rubber-based pressure-sensitive adhesives. This pressure-sensitive adhesive uses natural or synthetic rubber as the main raw material and adds low molecular weight thickeners, plasticizers and stabilizers. The pressure-sensitive adhesives prepared from these raw materials are hydrophobic and cannot effectively absorb water, so it will cause water accumulation in the sticking part and cause the skin to turn white. In addition, the added low-molecular-weight components may penetrate into the skin and cause adverse reactions ...

Claims

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Application Information

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IPC IPC(8): A61K47/34C09J7/02C09J175/04
Inventor 董岸杰李军龚志超
Owner TIANJIN UNIV
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