Preparation method for cross-linked three-dimensional carbon nano composite polyurethane material

A technology of carbon nanocomposite and polyurethane materials, which is applied in the field of preparation of cross-linked three-dimensional carbon nanocomposite polyurethane materials, can solve the problems of TPU's low strength, limited application range, poor heat resistance, etc., and achieve expanded application fields and good dispersion effect, mechanical properties and improved thermal stability

Active Publication Date: 2018-11-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TPU has defects such as low strength and relatively poor heat resistance (the long-term use temperature of TPU should not exceed 80°C, and the short-term use temperature should not exceed 120°C), which limits its application range.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] At 25°C, add 0.2g of acidified carbon nanotubes (o-CNTs), 0.1g of carboxylated graphene oxide (GO-COOH) and 400g of distilled water into a 1L reactor. After ultrasonic dispersion for 1.5h, the temperature of the reaction solution was raised to 70°C , put 4g of polyethyleneimine (molecular weight 1800) into the reaction kettle, react for 10h, wash with 800g of distilled water for 5 times, and vacuum dry the product at 60°C for 10h to prepare a composite carbon nanomaterial;

[0032]At 25°C, take 0.125g of the above-prepared composite carbon nanomaterial and 25g of polyether thermoplastic polyurethane (TPU) and stir evenly, first add the twin-screw extruder, the screw speed is 150r / min, and the blending temperature is 210°C. Then, the thermoplastic polyurethane is injected into molding by an injection molding machine, the injection temperature is 210°C, the mold temperature is 35°C, the injection pressure is 45MPa, the holding pressure is 25MPa, and the holding time is 15s...

Embodiment 2

[0035] At 25°C, add 0.1g of acidified carbon nanotubes (o-CNTs), 0.4g of carboxylated graphene oxide (GO-COOH) and 600g of distilled water into a 1L reactor. After ultrasonic dispersion for 1.5h, the temperature of the reaction solution was raised to 70°C , adding 5 g of polyethyleneimine (molecular weight: 8000) into the reactor, reacting for 10 h, washing with 800 g of distilled water for 5 times, and drying the product in vacuum at 60° C. for 10 h to obtain a composite carbon nanomaterial;

[0036] At 25°C, take 0.125g of the above-prepared composite carbon nanomaterial and 25g of polyether thermoplastic polyurethane (TPU) and stir evenly, first add the twin-screw extruder, the screw speed is 150r / min, and the blending temperature is 210°C. Then, the thermoplastic polyurethane is injected into molding by an injection molding machine, the injection temperature is 210°C, the mold temperature is 35°C, the injection pressure is 45MPa, the holding pressure is 25MPa, and the holdi...

Embodiment 3

[0039] At 25°C, add 0.2g of acidified carbon nanotubes (o-CNTs), 0.2g of carboxylated graphene oxide (GO-COOH) and 400g of distilled water into a 1L reactor. After ultrasonic dispersion for 1.5h, the temperature of the reaction solution was raised to 95°C , adding 6g of polyethyleneimine (molecular weight: 8000) into the reactor, reacting for 12h, washing with 800g of distilled water for 5 times, drying the product in vacuum at 60°C for 10h, to obtain a composite carbon nanomaterial;

[0040] At 25°C, take 0.5g of the functionalized graphite oxide / carbon nanotube composite nanocarbon material prepared above and 25g of polyether thermoplastic polyurethane (TPU) and stir evenly, and then add it to a twin-screw extruder at a speed of 150r / min , the blending temperature is 210°C, and then the thermoplastic polyurethane is injected into the injection molding machine. The injection temperature is 210°C, the mold temperature is 35°C, the injection pressure is 45MPa, the holding pressu...

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Abstract

The invention discloses a preparation method for a cross-linked three-dimensional carbon nano composite polyurethane material. The covalent cross-linked three-dimensional composite carbon nano material is prepared by a nucleophilic reaction of an amine compound with carboxylated graphene oxide (GO-COOH) and acidified carbon nanotubes (o-CNTs). Compared with a carbon nano material having a hydrogenbond and a pi-pi bond superposition effect, the three-dimensional composite carbon nano material prepared by a covalent bond effect facilitates increase of bonding force among the carbon nano material; and the prepared three-dimensional composite carbon nano material has obviously-improved dispersibility in a TPU substrate when being used as a filler of thermoplastic polyurethane (TPU), interaction force of an interface between the filler and the TPU substrate is enhanced, the TPU nano composite material has unique mechanical and thermal stability properties of graphene oxide and carbon nanotubes, tensile strength, elongation at break and thermal decomposition temperature of the TPU are respectively up to 63MPa, 1700% and 426 DEG C, and applications of the TPU in various national economyfields such as national defense, oil fields and mines are facilitated.

Description

technical field [0001] The invention relates to a preparation method of a cross-linked three-dimensional carbon nanocomposite polyurethane material, which is mainly used to improve the mechanical properties and thermal stability of thermoplastic polyurethane. Background technique [0002] Thermoplastic Polyurethane (TPU) is a linear block polymer polymerized by oligomer polyol (soft segment) and diisocyanate-chain extender (hard segment). The thermodynamic incompatibility between the soft segment and the hard segment produces microscopic phase separation. This unique structure endows TPU with high hardness, low temperature resistance, chemical resistance, oil resistance, water resistance, aging resistance, and weather resistance. It has excellent functions such as high water resistance, moisture permeability, windproof, cold proof, antibacterial, mildew proof, warm keeping, anti-ultraviolet rays, etc. It is widely used in the fields of automobile, electronics, machinery, med...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/06C08L75/08C08K9/04C08K3/04C08K7/24
CPCC08K9/04C08K9/08C08K2201/011C08L2201/08C08K3/041C08K3/042C08L75/06C08L75/08
Inventor 周钰明任慧何曼卜小海王泳娟南秋利黄裕中申华
Owner SOUTHEAST UNIV
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