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Method for preparing developing polyurethane

A polyurethane and developable technology, applied in catheters, medical science, prostheses, etc., can solve the problems of product change, loss of developable atoms, etc., and achieve the effect of easy processing, good physical properties, and easy realization

Inactive Publication Date: 2009-03-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the preparation of developable polyurethane materials, the method of blending can easily lead to changes in the product; and if the formation of ionic developing resins is easy to absorb water and cause the loss of developable atoms, these will limit the preparation and production of polyurethane developable materials to a certain extent. application

Method used

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  • Method for preparing developing polyurethane
  • Method for preparing developing polyurethane
  • Method for preparing developing polyurethane

Examples

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preparation example Construction

[0023] Its preparation method comprises steps:

[0024] (1) Mix polymer diol and diisocyanate, the molar ratio of mixing is: polymer diol:diisocyanate=0.25~0.80:1, stir and mix at 60~85°C for 2~5 hours under nitrogen protection , to obtain the prepolymer;

[0025] (2) Raise the temperature of the above-mentioned prepolymer to 80-100°C, add a chain extender in a molar ratio: chain extender: diisocyanate = 0.20-0.75:1, and stir for about 5-120 minutes;

[0026] (3) Curing the above polymer at a temperature of 80±5° C. for 3 to 12 hours.

[0027] In the method of the present invention, the solution polymerization method can also be used in the reaction process, adding a solvent to the system to stir the reaction, and the chain extension reaction takes about 1 to 4 hours to discharge the material, purify and mature to obtain the developable polyurethane. The effect of adding a solvent is to reduce the viscosity of the system and make the reactants mix more evenly, so that the re...

Embodiment 1

[0030] Mix the pre-vacuum dehydrated polytetrahydrofuran ether diol with a molecular weight of 1000 and 4,4'-diphenylmethane diisocyanate in a molar ratio of 0.74:1, stir and mix at 80°C for 2.5 hours under the protection of nitrogen to obtain Prepolymer; raise the temperature to 85°C, add pre-melted chain extender N, N-dihydroxyethyl-p-iodoaniline, and its molar ratio to 4,4'-diphenylmethane diisocyanate is 0.22:1 , stirring and reacting for about 20 minutes to discharge the material, and aging the obtained polymer at a temperature of 75° C. for 5 hours.

[0031] figure 1 It is the infrared spectrogram of the developable polyurethane (polyether polyurethane) prepared in Example 1. Wherein, a represents the infrared spectrum of the prepolymer synthesized in Example 1, and b represents the infrared spectrum of the developable polyether polyurethane synthesized in Example 1. We can see 3305cm -1 It is the stretching vibration peak of hydrogen bond association NH, but it is not ...

Embodiment 2

[0033] Mix the pre-vacuum dehydrated polytetrahydrofuran ether diol with a molecular weight of 2000 and isophorone diisocyanate in a molar ratio of 0.46:1, stir and mix at 78°C for 5 hours under the protection of nitrogen to obtain a prepolymer; Temperature to 85°C, add pre-melted chain extender N, N-dihydroxyethyl p-iodoaniline, the molar ratio of it to isophorone diisocyanate is 0.49:1, stir for about 3 hours, add 0.08% of the total mass % catalyst stannous octoate, and then stirred for 10 minutes, discharged, and the obtained polymer was matured at a temperature of 75° C. for 4 hours.

[0034] figure 2 It is the infrared spectrogram of the developable polyurethane (polycarbonate polyurethane) prepared in embodiment 2, wherein, a represents the prepolymer infrared spectrogram synthesized in embodiment 2, and b represents the developable polycarbonate type synthesized in embodiment 2 Infrared spectrum of polyurethane. We can see 3334cm -1 It is the stretching vibration pe...

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Abstract

The invention relates to a preparation method of developing polyurethane, which pertains to the technical field of high polymer material. The preparation method comprises the steps that: firstly, polymers, diatomic alcohol and diisocyanate are mixed; the mixture of the diatomic alcohol and the diisocyanate is stirred and reacts under the protection of nitrogen gas to obtain a prepolymer; after the temperature thereof is raised, the prepolymer is added with a chain extender and stirred for reaction; and the polymers are cured. As the chain extender contains developing atoms and developing groups are connected with the polyurethane by the effect of chemical bonds, the developing polyurethane prepared by the preparation method has long lasting development effect, good stability, biocompatibility and anticoagulant performance, arouses no inflammation in human bodies, is biological aging resistant and animalcule resistant, has good physical properties, can be sterilized by usual methods, is easy to be processed and takes advantages over non-developing polyurethane when being applied to heart valves, conduits and vascular stents. The preparation method is flexible, effective, simple and easy to be realized.

Description

technical field [0001] The invention relates to a preparation method of developable polyurethane, which belongs to the technical field of polymer materials. Background technique [0002] Polyurethane materials have the advantages of high tensile strength and elongation at break, good wear resistance, adhesion, solvent resistance, non-toxicity, easy molding and processing, and controllable performance, especially its good biological properties. The field of biomedicine occupies a very important position. Since Boretos and others conceived it as a biological material for the first time in 1967, polyurethane has been widely used in artificial heart assist devices, artificial blood vessels, artificial valves, etc. However, as the application of polyurethane materials in the field of human implants has become more and more widespread, it is increasingly desirable to be able to evaluate the application of these implant materials in the human body in a non-invasive way. X-ray ima...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/38C08G18/32C08G18/10A61L27/18A61L29/06A61L31/06
Inventor 夏维娟庹新林谢政连彦青王晓工
Owner TSINGHUA UNIV
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