Water polyurethane elastic thin-wall products preparation

A water-based polyurethane, elastic thin-walled technology, applied in the direction of coating, etc., can solve the problems of decreased storage stability, emulsion storage stability, and inability to effectively improve the film-forming performance of emulsion leaching, so as to reduce the number of repeated leaching , Easy to operate, economical and easy to operate, good biocompatibility effect

Inactive Publication Date: 2003-09-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot effectively improve the leaching and film-forming performance of the emulsion, and it will also lead to a decline in the storage stability of the emulsion.
[0005] The inventor once tried to improve its viscosity by increasing the solid content, but found through a large number of experiments that although the solid content reaches more than 40%, the viscosity of polyurethane emulsion can be obviously improved, but it will also cause a large decline in storage stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. Preparation of polyester / polyether polyurethane emulsion

[0047] Add 70 grams of polypropylene oxide diol (Mn=1000) and 70 grams of polybutylene adipate diol (Mn=1000) into a 250ml three-necked bottle, heat to 60°C and stir to dissolve for 10 minutes, Vacuum at 105°C, dehydrate for 10 minutes; cool down to 90°C, then add 16.59 grams of toluene diisocyanate (TDI), keep at 90°C for about 2 hours, measure NCO%, if NCO% is less than or equal to theory When the value is 6.8, add 5.03 grams of chain extender dimethylolpropionic acid (DMPA), react at 90°C for 25 minutes, cool down to 75°C and continue the reaction for 40 minutes, then start to measure NCO%, and measure it every 15 minutes , until the NCO% is less than or equal to the theoretical value of 0.7; cooling to 60 ℃, adding 90ml of acetone and stirring for 10 minutes, then adding 5 grams of triethylamine and stirring for 10 minutes, pouring the polyurethane prepolymer into a container containing 488 ml of distille...

Embodiment 2

[0053] 1. Purchase Bayer's Desmocoll KA No. 8066 water-based polyurethane emulsion, which has a solid content of 40%, a tensile strength of 37Mpa, and an elongation at break of 500%;

[0054] 2. Weigh 1000 grams of polyurethane emulsion and add it to a three-neck bottle, heat it to 30°C, dissolve 1 gram of sodium alginate, 4 grams of gelatin, and 15 grams of starch compound thickener with 120 times distilled water, add it, and start stirring. Stir at a speed of 120 rpm for 30 minutes to obtain;

[0055] This kind of thickened emulsion can be used to produce products such as gloves, condoms, because the specific preparation process is existing, so it is omitted. After the emulsion is thickened, the tensile strength of the film-forming material is 40 MPa, and the elongation at break is 460%.

Embodiment 3

[0057] 1. Preparation of polyester / polyether polyurethane emulsion

[0058] Put 350 grams of polyethylene adipate (Mn=1000) into the reactor, melt at 60°C, stir and cool down to 50°C, add polyethylene oxide propylene oxide copolyethylene glycol (Mn =1000) 350 grams and mix well; then add 110 grams of isophorone diisocyanate (IPDI), prepolymerize at 75°C for 50 minutes, then add 40 grams of bismethylol propionic acid and react at 90°C for 25 minutes , then lower the temperature to 75°C and react for 40 minutes to start measuring NCO%, and measure it every 15 minutes until NCO% is less than or equal to the theoretical value of 0.7; add 100 ml of acetone at 60°C and stir for 10 minutes, then add 35 grams of three After ethylamine was stirred for 10 minutes, the polyurethane prepolymer was poured into an emulsification device equipped with 1354 ml and vigorously stirred. After emulsification for 3 to 4 hours, the material could be discharged, and a polyester / polyether polyurethane...

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Abstract

A process for preparing the elastic thin-wall product of water polyurethane includews such steps as adding thickneing agent in water polyurethane emulsion, immersing the mould of thin-wall product in it, taking it out, drying and demoulding.

Description

1. Technical field [0001] The invention belongs to the technical field of polyurethane elastic thin-walled products and preparation thereof, and in particular relates to a method for preparing elastic thin-walled products with water-based polyurethane emulsion. 2. Background technology [0002] With its excellent physical and mechanical properties, good biocompatibility and flex resistance, polyurethane can replace natural rubber in preparations such as gloves, condoms, sleeves, boots, balloons, pacifiers, enema heads, inflatable bags and others. Elastic thin-walled products such as tubes have been widely used, especially in medical elastic thin-walled products. But when obtaining the polyurethane solution that prepares elastic thin-walled product with immersion, spraying, tape-casting mode, all be to adopt organic solvent to dissolve usually, as the European patent that application number is 0413467, what discloses is that model is immersed in organic solvent to dissolve A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C41/14
Inventor 钟银屏傅皓何成生樊翠蓉谢兴益李洁华
Owner SICHUAN UNIV
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