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Novel method for preparing hydrophobic self-healing hyperelastic polyurethane elastomer

A polyurethane elastic and superelastic technology, applied in the field of polyurethane, can solve the problems of complicated steps, high cost, slow material self-repairing process, etc., and achieve the effects of avoiding complicated steps, mild conditions and low cost.

Inactive Publication Date: 2021-01-19
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods can prepare hydrophobic self-healing PU, but the preparation process is time-consuming and the steps are complicated, and the self-healing process of some materials is slow and the cost is high

Method used

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  • Novel method for preparing hydrophobic self-healing hyperelastic polyurethane elastomer
  • Novel method for preparing hydrophobic self-healing hyperelastic polyurethane elastomer
  • Novel method for preparing hydrophobic self-healing hyperelastic polyurethane elastomer

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Experimental program
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Effect test

Embodiment 1

[0026] (1) Synthesis of 2,2'-dithiodiethanol: take a 30% hydrogen peroxide solution and β-mercaptoethanol with a molar ratio of 1.1:1 to prepare a sodium hydroxide solution with a pH of 9 to 11, and mix β -Mercaptoethanol was added to the sodium hydroxide solution, and 30% hydrogen peroxide solution was added dropwise with stirring at 25°C. After the dropwise addition, the two were mixed evenly, and the reaction was stirred at 300 rpm in a three-necked flask for 2.5 hours. After the reaction was completed, the synthesized organic product was extracted with ethyl acetate and repeated 4 times. The obtained organic layer was subjected to rotary evaporation treatment with a rotary evaporator. The ethyl acetate extractant was removed, and finally it was placed in a vacuum oven and dried at 50 °C for 12 h to remove trace water.

[0027] (2) Preparation of twin-type chain extender: place bisphenol AF in a vacuum oven at 110 ° C to dry and remove water for 8 h, take bisphenol AF and ...

Embodiment 2

[0030] (1) Synthesis of dithiodiphenol: take a 30% hydrogen peroxide solution and 2-hydroxy thiophenol with a molar ratio of 1.1:1 to prepare a sodium hydroxide solution with a pH of 9 to 11. The thiophenol was added to the sodium hydroxide solution, and 30% hydrogen peroxide solution was added dropwise with stirring at 25°C. After the dropwise addition, the two were mixed evenly, and the reaction was stirred at 300 rpm in a three-necked flask for 2.5 hours. After the reaction was completed, the synthesized organic product was extracted with ethyl acetate and repeated 4 times. The obtained organic layer was subjected to rotary evaporation treatment with a rotary evaporator. The ethyl acetate extractant was removed, and finally it was placed in a vacuum oven and dried at 50 °C for 12 h to remove trace water.

[0031] (2) Preparation of twin-type chain extender: 3-(N,N-dihydroxyethyl) hexafluorobutyl methacrylate was placed in a vacuum oven at 50 ° C to dry and remove water for...

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Abstract

The invention discloses a novel method for preparing a hydrophobic self-healing hyperelastic polyurethane elastomer. The preparation method comprises the steps: firstly, taking mercaptan and small-molecular fluoroalcohol as raw materials to prepare a gemini-type chain extender containing disulfide bonds and rich fluorine atoms; and then, feeding the raw materials of isocyanate, polyhydric alcoholand the gemini chain extender at a time to react, and thus preparing the polyurethane elastomer containing alternately distributed short hard segment nodes through a 'one-pot boiling' method. The preparation method is simple and easy to operate, low in cost and short in consumed time, the prepared polyurethane elastomer has excellent hydrophobicity, self-healing performance and superelasticity andcan be repaired at the temperature of 40 DEG C, meanwhile, the tensile strength of the polyurethane elastomer can reach 12.469 MPa, the breaking elongation of the polyurethane elastomer can reach 747.2%, and the polyurethane elastomer can restore to 96.5% of the original after being stretched 1000 times under 500% strain.

Description

technical field [0001] The invention relates to the technical field of polyurethane, in particular to a new method for preparing a hydrophobic self-healing superelastic polyurethane elastomer. Background technique [0002] Polyurethane (PU) elastomer is a polymer with urethane repeating structural units made by the reaction of polyisocyanates and polyols, which has the advantages of high abrasion resistance, flexibility and stretchability. However, there are hydrophilic groups on the polyurethane, and the hydrophobicity is poor. At the same time, the tiny cracks generated in the PU elastomer during processing, transportation and use will reduce its mechanical properties and shorten its life. Therefore, it is necessary to study hydrophobic self-healing properties. PU is very meaningful, and most of the hydrophobic self-healing PU elastomers are currently prepared by "two-step synthesis method", first synthesizing PU prepolymer and then cross-linking, such as Chinese patent ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/69C08G18/67C08G18/48C08G18/32
CPCC08G18/3812C08G18/3868C08G18/6775C08G18/7671C08G18/755C08G18/4854C08G18/69
Inventor 周春华赵政张明明
Owner UNIV OF JINAN
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