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Preparation method of high-strength high-barrier TPU composite material

A composite material and high-barrier technology, applied in the field of polymer composite material synthesis, to achieve the effect of increasing the number of hydroxyl groups, increasing the degree of cross-linking, and increasing the number of reaction sites

Active Publication Date: 2020-05-12
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the inadequacy of existing TPU synthesis methods that cannot obtain TPU composite materials with both high barrier performance and high mechanical properties, the present invention provides a preparation method for high-strength and high-barrier TPU composite materials. TPU composite material has high mechanical properties and barrier properties at the same time, and the comprehensive performance is more excellent

Method used

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  • Preparation method of high-strength high-barrier TPU composite material
  • Preparation method of high-strength high-barrier TPU composite material
  • Preparation method of high-strength high-barrier TPU composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0037]1) Preparation of graphene oxide: Take 1g of flake graphite, add it to 23mL of concentrated sulfuric acid and mix well, keep magnetic stirring; slowly add 3g of KMnO in batches under the condition of temperature 4 , 0.5g of NaNO 3 , the reaction continued for 4 hours, raised to 35°C and reacted for 2 hours, then raised the temperature to 98°C; added 44mL deionized water to the system, and added 5wt% H2 dropwise after 10min 2 o 2 Until the solution is golden yellow and no bubbles are generated, finally add 20mL of 5wt% HCl; centrifuge and wash the suspension several times until pH = 7, and freeze-dry at -80°C after ultrasonication for 2 hours to obtain graphene oxide;

[0038] 2) Preparation of modified graphene oxide: Add 0.0335g of graphene oxide prepared in step 1) into 10mL of DMF to obtain graphene oxide / DMF suspension, ultrasonically disperse for 1h, add 0.1675g of chitosan under magnetic stirring at 500rpm, React at 25°C for 12 hours to obtain a modified graphene ...

Embodiment 2

[0045] 1) Preparation of graphene oxide: Take 1g of flake graphite, add it to 23mL of concentrated sulfuric acid and mix well, keep magnetic stirring; slowly add a total of 3g of KMnO in batches at low temperature (4 , 0.5g NaNO 3 , the reaction continued for 4 hours, raised to medium temperature (35°C) and then reacted for 2 hours, then raised the temperature to 98°C; added 44mL deionized water to the system, and added 5wt%H2 dropwise after 10min 2 o 2 Until the solution is golden yellow and no bubbles are generated, finally add 20mL of 5wt% HCl; centrifuge and wash the suspension several times until pH = 7, and freeze-dry at -80°C after ultrasonication for 2 hours to obtain graphene oxide;

[0046] 2) Modification of graphene oxide: add 0.0670g graphene oxide prepared in step 1) to 10mL DMF to obtain graphene oxide / DMF suspension, ultrasonically disperse for 1h, add 0.3350g chitosan under the condition of 500rpm magnetic stirring, 25 °C for 12 hours to obtain a modified gra...

Embodiment 3

[0053] 1) Preparation of graphene oxide: Take 1g flake graphite, add it to 23mL concentrated sulfuric acid and mix well, keep magnetic stirring; slowly add 3gKMnO in batches at low temperature (4 , 0.5gNaNO 3 , the reaction continued for 4 hours, raised to medium temperature (35°C) and reacted for 2 hours, then raised the temperature to 98°C; added 44mL deionized water to the system, and added 5% H2O dropwise after 10min 2 o 2 Until the solution is golden yellow and no bubbles are generated, finally add 20mL of 5% HCl; centrifuge and wash the suspension several times until PH = 7, and freeze-dry at -80°C after ultrasonication for 2 hours to obtain graphene oxide;

[0054] 2) Modification of graphene oxide: Add 0.1005g of graphene oxide prepared in step 1) to 10mL of DMF to obtain a graphene oxide / DMF suspension, ultrasonically disperse for 1h, and add 0.5025g of chitosan under the condition of 500rpm magnetic stirring, React at 25°C for 12 hours to obtain a modified graphene ...

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Abstract

The invention discloses a preparation method of a high-strength high-barrier TPU composite material, and belongs to the technical field of polymer composite material synthesis. According to the method, carrying out a reaction between polytetramethylene ether glycol and 4, 4 '-methylenediphenyl diisocyanate to obtain an isocyanate-terminated TPU prepolymer, adding modified graphene oxide into the TPU prepolymer, and taking the modified graphene oxide and 1, 4-butanediol as a compound chain extender to participate in an in-situ polymerization process, so as to complete a chain extension reaction, thereby obtaining the high-strength and high-barrier TPU composite material. The modified graphene oxide enables reaction sites of a reaction system to be increased; the crosslinking degree of the composite material is improved, and a large number of covalent bonds and hydrogen bonds exist in the prepared TPU composite material, so that the dispersity of the modified graphene oxide in a TPU matrix is good, the interface bonding force with the TPU matrix is enhanced, and the barrier property and the mechanical property of the TPU composite material are improved.

Description

technical field [0001] The invention belongs to the technical field of polymer composite material synthesis, and in particular relates to a preparation method of a high-strength and high-barrier TPU composite material. Background technique [0002] Thermoplastic polyurethane (TPU) is a block polymer composed of a soft soft segment and a rigid hard segment. The soft segment is composed of a polymeric polyol with a large molecular weight, and the hard segment is composed of a small molecule polyol and a diisocyanate. TPU has the characteristics of both elastomers and plastics, and has excellent performance characteristics such as wear resistance, oil resistance and ozone resistance. It is widely used in the fields of adhesives, medical devices, fabrics, coatings and other materials. However, the barrier properties of TPU films to oxygen and other small molecules are not good. Improving the barrier properties of TPU films simply by adding fillers will lead to a decrease in mech...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/64C08G18/48C08G18/10C08G18/32C08K9/02C08K3/04
CPCC08G18/10C08G18/4854C08G18/6484C08G18/7671C08K9/02C08K3/042C08G18/3206C08G18/64
Inventor 郑玉婴张钊滟
Owner FUZHOU UNIVERSITY
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