Method for preparing polyurethane nano-composite material

A nano-composite material and nano-material technology are applied in the field of preparation of polyurethane nano-composite materials to achieve the effects of expanding application fields, improving mechanical properties and heat resistance, and promoting cross-linking

Active Publication Date: 2017-05-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, there have been more and more studies on the modification of polyurethane, but it is rare to combine multiple materials together to modify polyurethane. Therefore, it is very important to explore the joint modification of polyurethane with various inorganic materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] At 25°C, 0.5g of multi-walled carbon nanotubes (MWCNTs) was added to the sand core acidifier, and the sand core acidifier was suspended in a 100mL closed reaction kettle containing 2.5mL (mass fraction 65wt.%) of nitric acid, and then Raise the temperature to 160°C and acidify for 4h. Cool to room temperature after the reaction, remove the nitric acid solution, wash with deionized water until neutral, and dry in a vacuum oven at 60°C to obtain acidified carbon nanotubes. Then take 0.1 g of acidified carbon nanotubes into the reactor, add 5 mL of ethanol and 5 mL of water, and ultrasonically disperse for 1 h. Use ammonia water with a mass fraction of 25wt.% to 28wt.% to adjust the pH to 9.0 to 10.0, and add 1 mL of tetraethyl orthosilicate and 1 mL of n-butyl titanate to the reaction system dropwise within 1 hour using a constant pressure dropping funnel. 60mL ethanol mixed solution, reacted for 8h. Filtered, washed three times with 50 mL ethanol, then washed three tim...

Embodiment 2

[0027] At 25°C, 0.5 g of multi-walled carbon nanotubes (MWCNTs) was added to the sand core acidifier, and the sand core acidifier was suspended in a 100 mL closed reaction kettle containing 5 mL (mass fraction 65 wt.%) of nitric acid, and then the temperature was raised To 170°C, acidify for 5h. Cool to room temperature after the reaction, remove the nitric acid solution, wash with deionized water until neutral, and dry in a vacuum oven at 65°C to obtain acidified carbon nanotubes. Then take 0.1g acidified MWCNTs into the reactor, add 6mL ethanol and 6mL water, and ultrasonically disperse for 1h. Use ammonia water with a mass fraction of 25wt.% to 28wt.% to adjust the pH to 9.0 to 10.0, and add 1.5mL tetraethyl orthosilicate and 1.5mL orthotitanate to the reaction system dropwise with a constant pressure dropping funnel within 1h. 90mL ethanol mixed solution of butyl ester, reacted for 9h. Filtered, washed three times with 50 mL ethanol, then washed three times with 50 mL de...

Embodiment 3

[0032] At 25°C, add 0.5 g of single-walled carbon nanotubes (SWCNTs) into the sand core acidifier, and place the sand core acidifier in a 100 mL closed reaction containing 7.5 mL (mass fraction 65wt.% to 68wt.%) of nitric acid. Kettle, and then heated to 180 ° C, acidified for 5.5h. Cool to room temperature after the reaction, remove the nitric acid solution, wash with deionized water until neutral, and dry in a vacuum oven at 70°C to obtain acidified carbon nanotubes. Then take 0.1g acidified SWCNTs into the reactor, add 7mL ethanol and 7mL water, and ultrasonically disperse for 1h. Use ammonia water with a mass fraction of 25wt.% to 28wt.% to adjust the pH to 9.0 to 10.0, and add 2 mL of tetraethyl orthosilicate and 2 mL of n-butyl titanate to the reaction system dropwise within 1 hour using a constant pressure dropping funnel. 120mL ethanol mixed solution, reacted for 10h. Filtered, washed three times with 50 mL ethanol, then washed three times with 50 mL deionized water,...

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Abstract

The invention provides a method for preparing a polyurethane nano-composite material. According to the method, through adding a modified carbon nanotube composite nano-material into thermoplastic polyurethane elastomer (TPU) by a solution melt blending method, the mechanical properties and heat resistance of the TPU are improved, and then, high-performance polyurethane nano-composite hoses are prepared. Through growing a nano-silica (SiO2) and nano-titania (TiO2) core-shell wrapping layer on the surface of each acidized carbon nanotube in situ, a core-shell type carbon nanotube composite nano-material is formed, and the carbon nanotubes (CNTs), SiO2 and TiO2 can be uniformly dispersed and compounded; through the coupling modification of a silane coupling agent and the effective compounding of TPU, the mechanical properties and heat resistance of the TPU are excellently improved, the dispersity of inorganic materials in the composite material is improved, and then, the high-performance polyurethane nano-composite hoses are prepared, so that the field of application of the TPU is extended by the polyurethane nano-composite material.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane nanocomposite material, which is mainly used for improving the mechanical properties and thermal stability and heat resistance of thermoplastic polyurethane, and further preparing a high-performance polyurethane nanocomposite hose. Background technique [0002] Thermoplastic polyurethane (TPU) is a kind of high polymer with unique properties that can be heated and plasticized by reacting polyisocyanate and polyol, and can be dissolved in a certain solvent. TPU has high hardness, high elasticity, good oil resistance and excellent low temperature performance. Hose, because of its long service life, low cost of use, and higher social benefits than rubber, will become an upgraded product of rubber hose. But there are some obvious disadvantages, which greatly limit its scope of application. The strength is not high, the heat resistance is poor, and it is easy to soften and decompose at high t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08L75/06C08K9/10C08K9/06C08K7/24C08K3/36C08K3/22
CPCC08K3/22C08K3/36C08K7/24C08K9/06C08K9/10C08K2003/2241C08K2201/011C08L75/08C08L75/06
Inventor 周钰明丁彬彬任慧何曼张一卫黄镜怡王泳娟申华黄裕中
Owner SOUTHEAST UNIV
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