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Method for preparing modified urethane elastomer

A polyurethane elastomer and polyurethane material technology, applied in the field of materials, can solve the problems of reduced elongation at break, reduced elongation at break of composite materials, poor dispersion of carbon nanotubes, etc. The effect of improving mechanical properties

Inactive Publication Date: 2008-12-31
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

They found that the modulus, tensile strength, electrical conductivity, and antistatic ability of the polyurethane material were improved by carbon nanotubes, but the elongation at break of the composite material of the original carbon nanotubes decreased, which was because the untreated Carbon nanotubes cannot achieve a good dispersion effect in the polyurethane matrix, so even if other mechanical properties are improved to a certain extent, the elongation at break is reduced
[0004] The dispersion of micron-scale carbon nanotubes in the polymer matrix is ​​extremely poor, and an unsatisfactory aggregation state appears in the final composite material, and the intertwined carbon nanotube coils cannot give full play to their own advantages

Method used

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  • Method for preparing modified urethane elastomer
  • Method for preparing modified urethane elastomer
  • Method for preparing modified urethane elastomer

Examples

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Effect test

Embodiment 1

[0032] Embodiment 1: Preparation of polyethylene glycol (molecular weight 2000) PEG-2000 modified single-wall carbon nanotube (SWNT-PEG2000) modified polyurethane elastomer:

[0033] (1) Take 1.0g of single-walled carbon nanotubes prepared by CVD (produced by Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences, diameter 1-2nm, purity ≥ 90%), add 300ml ratio of 3 / 1 concentrated sulfuric acid / concentrated nitric acid mixed acid In the solution, react under 100kHz ultrasonic wave for half an hour, heat to 40° C. and reflux for 4 hours. Then wash repeatedly with water until pH=7. The product was obtained by vacuum drying. Then mix it with the acidified product in 300ml of sulfuric acid / hydrogen peroxide mixture (ratio 2 / 1), ultrasonicate at 100kHz for half an hour, and heat to reflux at 70°C for 2 hours. Then wash repeatedly with water until pH=7. The product was vacuum-dried and collected for future use.

[0034](2) Take 500 mg of the above-mentioned acidified ca...

Embodiment 2

[0038] Embodiment 2: Preparation of polyethylene glycol (molecular weight 800) PEG-800 modified multi-walled carbon nanotubes (MWNT-PEG800) modified polyurethane elastomer

[0039] (1) Take 1.0 g of multi-walled carbon nanotubes prepared by CVD (produced by Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences, with a diameter of 8 to 15 nm and a purity of ≥90%), and add 300 ml of mixed acid with a ratio of 3 / 1 concentrated sulfuric acid / concentrated nitric acid In the solution, react under 100kHz ultrasonic wave for half an hour, heat to 40° C. and reflux for 4 hours. Then wash repeatedly with water until pH=7. The product was obtained by vacuum drying. Then mix it with the acidified product in 300ml of sulfuric acid / hydrogen peroxide mixture (ratio 2 / 1), ultrasonicate at 100kHz for half an hour, and heat to reflux at 70°C for 2 hours. Then wash repeatedly with water until pH=7. The product was vacuum-dried and collected for future use.

[0040] (2) Take 500 mg...

Embodiment 3

[0045] Embodiment 3: Preparation of pentaerythritol modified single-walled carbon nanotube (SWNT-PE) modified polyurethane elastomer

[0046] (1) Take 1.0g of single-walled carbon nanotubes prepared by CVD (produced by Chengdu Organic Chemistry Co., Ltd., Chinese Academy of Sciences, diameter 1-2nm, purity ≥ 90%), add 300ml ratio of 3 / 1 concentrated sulfuric acid / concentrated nitric acid mixed acid In the solution, react under 100kHz ultrasonic wave for half an hour, heat to 40° C. and reflux for 4 hours. Then wash repeatedly with water until pH=7. The product was obtained by vacuum drying. Then mix it with the acidified product in 300ml of sulfuric acid / hydrogen peroxide mixture (ratio 2 / 1), ultrasonicate at 100kHz for half an hour, and heat to reflux at 70°C for 2 hours. Then wash repeatedly with water until pH=7. The product was vacuum-dried and collected for future use.

[0047] (2) Take 500 mg of the above-mentioned acidified single-walled carbon nanotubes and 10 g of...

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Abstract

The invention discloses a method for preparing polyurethane elastomer modified by a carbon nano-tube. After acidification and acylchlorination at the surface, the carbon nano-tube reacts with polyhydroxy compound or oligomer to produce a carbon nano-tube with functionalized hydroxyls; one or more hydroxyls are connected to the surface of the functionalized carbon nano-tube through covalent bonds and have certain crosslinking and chain extension functions if being applied in the synthesis of polyurethane, thus greatly increasing the bonding force between the interfaces of the carbon nano-tube and the polyurethane base body, and meanwhile, the existence of hydroxyls improves the dispersibility of the carbon nano-tube in the polyurethane base body, which greatly improves the mechanical properties in all aspects of the functionalized carbon nano-tube / polyurethane composite material as compared the original carbon nano-tube / polyurethane composite material. Furthermore, the carbon nano-tube is capable of changing the dielectric property of the polyurethane composite material or even producing conductive polyurethane, thus enlarging the application range and field of polyurethane.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a preparation method of polyurethane elastomer modified by carbon nanotubes. Background technique [0002] Carbon nanotubes not only have unique properties such as very high strength, excellent electromagnetic properties and thermal stability, but also have similar structures to polymer materials. Therefore, it is of great research and application value to improve the performance of polymers by compounding with carbon nanotubes. [0003] Polyurethane materials have high elasticity, good flexibility, high Young's modulus and excellent wear resistance, good weather resistance, oil resistance, grease resistance and many solvent resistance. In addition, the products have various shapes and molding processes. It is simple and convenient, so it is widely used in various industries. However, its strength is not high, and its heat resistance, water resistance, and antistatic performance are poor...

Claims

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Application Information

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IPC IPC(8): C08G18/28C08G18/42C08G18/48C08K9/04C08L75/04C08K3/04
Inventor 王国建董玥杨姝许乾慰李岩邱军
Owner TONGJI UNIV
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