Preparation of functionalized carbon nano-tube modification polyurethane elastomer

A technology of carbon nanotube modification and polyurethane elasticity, which is applied in the field of preparation of functionalized carbon nanotube modified polyurethane elasticity, can solve the problem of changing the performance effect of polymer materials, poor dispersion of carbon nanotubes, weak binding force, etc. problems, to achieve the effect of facilitating large-scale industrial production, improving mechanical properties, and enhancing interaction force

Inactive Publication Date: 2011-01-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the dispersion of existing carbon nanotubes in polymer materials is not good, and the effect of changing the properties of polymer materials is not significant due to the weak binding force between carbon nanotubes and polymers.

Method used

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  • Preparation of functionalized carbon nano-tube modification polyurethane elastomer
  • Preparation of functionalized carbon nano-tube modification polyurethane elastomer
  • Preparation of functionalized carbon nano-tube modification polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Put 2g of multi-walled carbon nanotubes (MWNT) into a single-necked flask, add 70% concentrated nitric acid and 95% concentrated sulfuric acid mixture (100ml, volume ratio 1:3) for ultrasonication for 1h, then heat in a water bath at 80°C Condensate and reflux for 3 hours, centrifuge, add deionized water and wash for several times until the pH value of the mixed solution is about neutral, put the washed MWNT in a vacuum oven and dry for 48 hours to obtain oxidized multi-walled carbon nanotubes MWNT-COOH, which are placed in Store in a desiccator.

[0023] (2) Dissolve 0.05g of dried oxidized MWNT in 10ml of DMAC and ultrasonically shake for 1h to completely disperse the carbon nanotubes in DMAC, then heat it in a water bath to 70°C, add 0.8ml of TDI, and react for 4h to obtain surface-grafted Carbon nanotubes with TDI groups.

[0024] (3) 10 g of thermoplastic polyurethane particles were dissolved in 30 ml of DMAc solvent, swelled at room temperature for 4 hours, a...

Embodiment 2

[0029] (1) Same as Example 1, except that the multi-walled carbon nanotubes are replaced by single-walled carbon nanotubes (SWNTs).

[0030] (2) Dissolve 0.15g of dry oxidized SWNT in 10ml DMF and oscillate ultrasonically for 1h to completely disperse the carbon nanotubes in DMF, then heat in a water bath to 70°C, add 2.5ml of TDI, and react for 4h to obtain surface-grafted Carbon nanotubes with TDI groups.

[0031] (3) As in Example 1, mix the carbon nanotubes grafted with TDI in (2) into the prepared polyurethane solution.

[0032] (4) The carbon nanotube / polyurethane solution prepared in (3) is cast into a film to obtain a carbon nanotube / polyurethane composite material with a mass percentage of SWNT-TDI of about 1.5%. The measured tensile strength of the composite material is 21MPa, and the elongation at break is 426%.

Embodiment 3

[0034] (1) With embodiment 1.

[0035] (2) Dissolve 0.3g of dried oxidized MWNT in 10ml DMSO and ultrasonically shake for 1h to completely disperse the carbon nanotubes in DMSO, then heat in a water bath to 70°C, add 5mlMDI, and react for 4h to obtain MDI grafted on the surface groups of carbon nanotubes.

[0036] (3) Same as Example 1, mix the carbon nanotubes grafted with MDI in (2) into the prepared polyurethane solution.

[0037] (4) The carbon nanotube / polyurethane solution prepared in (3) is cast into a film to obtain a carbon nanotube / polyurethane composite material with a mass percentage of MWNT-MDI of about 3%.

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Abstract

The invention relates to a method for preparing a functional carbon nanotube modified polyurethane, which comprises: firstly, preparation of the functional carbon nanotube, namely, dissolving a carbon nanotube into a mixed solution of concentrated sulfuric acid and concentrated nitric acid the volume ratio of which is 3:1, performing ultrasonic vibration for 1 to 2 hours, heating the mixed solution in water bath, refluxing the mixed solution for 3 to 4 hours, taking out the mixed solution, and obtaining CNT-COOH after dilution, centrifugation, filtration and drying of the mixed solution by deionized water; and dispersing the CNT-COOH into an organic solvent, adding isocyanate into the organic solvent, performing heating in water bath, and obtaining the functional carbon nanotube; and secondly, preparation of a functional carbon nanotube / polyurethane composite system, namely, dissolving the functional carbon nanotube into a thermoplastic polyurethane solution by a solution mixing method, and processing the functional carbon nanotube to form the functional carbon nanotube / polyurethane composite system; or directly mixing the functional carbon nanotube and polyurethane by means of fusing and processing, and extruding the functional carbon nanotube to form the functional carbon nanotube / polyurethane composite system. The method is easy, simple and convenient, has simple equipment,and is suitable for mass production and used in the fields of material reinforcement, electrical conductance, heat conduction and so on; and the elasticity, the mechanical property and the thermal stability of the material obtained are changed correspondingly.

Description

technical field [0001] The invention belongs to the field of preparation of modified polyurethane elasticity, and in particular relates to a preparation method of functionalized carbon nanotube modified polyurethane elasticity. Background technique [0002] As a common polymer material, polyurethane (PU) has high elasticity, good flexibility, high elastic modulus and excellent wear resistance. Among many polyurethane products, thermoplastic polyurethane elastomer (TPU) is a linear block copolymer composed of oligomer polyol soft segment and diisocyanate-chain extender hard segment, and its output accounts for about 25% of the total polyurethane elastomer is mainly used in auto parts and machine parts, sports shoe soles, rubber rollers, wires and cables, hoses, films and sheets, fabrics (coating and high elastic socks, etc.), tape adhesives , fabric coatings, adhesives, etc. Similar to other thermoplastics, TPU has rubber-elastic or plastic properties at room temperature, m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08K9/04C08J3/20
CPCC08K7/22C08K9/02
Inventor 张清华杨昱赵昕尤志强陈大俊
Owner DONGHUA UNIV
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