Method for preparing waterproof poromeric sterilizing polyurethane elastomer

A polyurethane elastomer, waterproof and breathable technology, which is applied in the field of polyurethane elastomer preparation, can solve the problems of high surface adhesion, poor mechanical properties, difficult demoulding and use, etc., and achieves mature technology, good mobility, and rapid sterilization. Effect

Inactive Publication Date: 2005-06-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since the 1960s, polyvinyl chloride, neoprene and various synthetic rubbers have been very popular as clothing for harsh environments. Although these clothing have the advantages of waterproofing and liquid leakage prevention, the sweat produced by the body's own metabolism cannot Excreted from the body in time, causing people to feel hot, cold and wet, etc., mainly because the polymer materials at that time lacked "breathability"
but still not antibacterial
[0006] In addition, the present inventors found that although the polyurethane material with PEG as the soft segment has good air permeability, due to the good hydrophilicity of PEG, the mechanical properties of this material are poor, the surface adhesion is very large, and it is not easy to demoulding and use, such as the material prepared by WO90 / 00180 can not fully meet the use requirements

Method used

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  • Method for preparing waterproof poromeric sterilizing polyurethane elastomer
  • Method for preparing waterproof poromeric sterilizing polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、3

[0048] What these two examples adopted is solvent-free two-step synthesis technique. Add polymer diols with corresponding molecular weights into a reactor equipped with a stirrer, thermometer and nitrogen protection, heat up to the corresponding temperature, and then vacuum degassing for a certain period of time; after cooling down to the corresponding temperature, add diisocyanate and prepolymerize React for a certain period of time; then add chain extender and bactericidal end-capping agent, stir rapidly, and heat up to the corresponding temperature for polymerization reaction for a certain period of time; finally pour it out into the preheated polytetrafluoroethylene tray and mature at the corresponding temperature After a certain period of time, a white polyurethane elastomer can be obtained. See Table 1 for specific component varieties, proportions and process conditions.

Embodiment 2、5～9

[0050] What this group of embodiment adopts is to have solvent two-step synthesis technique. Add polymer diols with corresponding molecular weights into a reaction kettle equipped with a stirrer, a thermometer, nitrogen protection and a solvent, and raise the temperature to the corresponding temperature; then add diisocyanate that has been dissolved in the solvent, stir, mix and Prepolymerize at high temperature for a certain period of time; then add the chain extender and end-capping agent that have been dissolved in the solvent, and heat up to the corresponding temperature for polymerization reaction for a certain period of time; finally, pour the reactant into the mixed solution of methanol and water for precipitation, and obtain after drying White elastomer. See Table 1 for specific component varieties, proportions and process conditions.

Embodiment 4

[0052] In this example, a solvent-free one-step synthesis process was adopted. Add the corresponding molecular weight polymer diol, chain extender and bactericidal end-capping agent into the reaction kettle equipped with agitator, thermometer and nitrogen protection, stir and mix, and heat up to the corresponding temperature, vacuum degassing for a certain period of time ; Then add diisocyanate, polymerize for a certain period of time; then pour the reaction mixture into a preheated polytetrafluoroethylene tray, and ripen for a certain period of time at the corresponding temperature to obtain a white polyurethane elastomer. See Table 1 for specific component varieties, proportions and process conditions.

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Abstract

The invention relates to a method for preparing water-proof antibacterial polyurethane elastomer. Use one-step or two-step synthesizing method which inorganic solvent which is easy and useful to control, or that with organic solvent, with the polymer diatomic alcohol of 20-75%, diisocyanate and chain-extending agent of 25-80%through a certain technique mol ratio of diisocyanate chain-extending agent is 1.03-1.2, while the antibacterial blocking agent is 1.5-2times of the mole number difference of diisocyanate and polymer diatomic alcohol+ chain-extending agent. The antibacterial polyurethane elastomer made by the invention has outstanding mechanical property and permeability of water steam, as well as antibacterial effect, including gram-positive bacterium and gram-negative bacterium; it can be applied to produce protective product like medical protective glove, safeguard and various kinds of coating material.

Description

1. Technical field [0001] The invention belongs to the technical field of preparation methods of polyurethane elastomers, and in particular relates to a preparation method of waterproof, breathable and bactericidal polyurethane elastomers. 2. Background technology [0002] Since the 1960s, polyvinyl chloride, neoprene and various synthetic rubbers have been very popular as clothing for harsh environments. Although these clothing have the advantages of waterproofing and liquid leakage prevention, the sweat produced by the body's own metabolism cannot Excreted in time, it makes people feel hot, cold and wet, etc., which is mainly due to the lack of "breathability" of the polymer materials at that time. [0003] In order to solve this problem, people have developed a waterproof and breathable polymer material, which does not allow the penetration of liquids such as external water droplets, but can ensure that the water vapor generated in it can freely penetrate from the inside ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/32C08G18/72C08G18/10C08K5/3445
Inventor 钟银屏罗建斌谭鸿李洁华谢兴益何成生樊翠蓉
Owner SICHUAN UNIV
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