Epoxy resin-PTFE/TiO2/graphene oxide composite coating and preparation method thereof

A graphene composite, epoxy resin technology, applied in epoxy resin coatings, coatings, anti-corrosion coatings and other directions, can solve problems such as hindering corrosive media, reducing accuracy, reliability and stability, and prone to agglomeration

Inactive Publication Date: 2019-07-12
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The loss caused by friction will not only cause energy loss and waste of resources, but also reduce the accuracy, reliability and stability of mechanical parts due to the wear and tear of materials. makes sense for normal use
[0003] Traditional anti-friction film materials often have problems such as insufficient hardness, uneven distribution of composite materials, and poor corrosion resistance.
[0004] Although PTFE is a material with excellent performance, the addition of PTFE will cause the hardness of the coating to decrease, so it is necessary to modify the epoxy resin-PTFE composite coating by other means; TiO 2 Is a very good nanoparticle to improve the hardness of the coating, however TiO 2 The presence of hydroxyl groups on the surface will not only increase the hydrophilicity of the coating but also cause TiO 2 It is easy to agglomerate, resulting in TiO 2 The performance of graphene oxide cannot be fully exerted; theoretically, after graphene oxide is added to the composite material, the sheet structure of graphene oxide will play a role in hindering the corrosion medium, but because graphene oxide itself is very easy to agglomerate, it will cause graphite oxide The structural properties of alkenes cannot be fully utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0051] Preparation of modified graphene oxide: Take water, ethanol, and silane coupling agent to prepare a silane coupling agent hydrolyzate, adjust the pH value of the hydrolyzate, add graphene oxide before modification to the silane coupling agent hydrolyzate, heat Stirring reaction, separation and purification to obtain modified graphene oxide.

[0052] The silane coupling agent is silane coupling agent KH550.

[0053] The graphene oxide before modification is graphene oxide with oxygen-containing groups on the surface, and the oxygen-containing groups are preferably hydroxyl or carboxyl.

[0054] The mass ratio of silane coupling agent: ethanol: water in the silane coupling agent hydrolyzate is 1:12:30.

[0055] The mass ratio of the graphene oxide before the modification to the silane coupling agent KH550 is 1:20.

[0056] The reaction is carried out under the condition of magnetic stirring, the reaction temperature is 60°C, and the reaction time is 12h. Before startin...

preparation example 2

[0059] Preparation of modified graphene oxide: Take water, ethanol, and silane coupling agent to prepare a silane coupling agent hydrolyzate, adjust the pH value of the hydrolyzate, add graphene oxide before modification to the silane coupling agent hydrolyzate, heat Stirring reaction, separation and purification to obtain modified graphene oxide.

[0060] The silane coupling agent is silane coupling agent KH550.

[0061] The graphene oxide before modification is graphene oxide with oxygen-containing groups on the surface, and the oxygen-containing groups are preferably hydroxyl or carboxyl.

[0062] The mass ratio of silane coupling agent: ethanol: water in the silane coupling agent hydrolyzate is 4:7:20.

[0063] The mass ratio of the graphene oxide before the modification to the silane coupling agent KH550 is 0.8:15.

[0064] The reaction is carried out under the condition of magnetic stirring, the reaction temperature is 80°C, and the reaction time is 24h. Before starti...

preparation example 3

[0067] Modified TiO 2 Preparation: Take ethanol and silane coupling agent to configure silane coupling agent hydrolyzate, adjust the pH value of the hydrolyzate, and mix TiO 2 Add to the hydrolyzed solution of silane coupling agent, heat and stir to react, separate and purify to obtain modified TiO 2 .

[0068] Described silane coupling agent is silane coupling agent KH570

[0069] The mass ratio of silane coupling agent: ethanol: water in the silane coupling agent hydrolyzate is 6:65:14.

[0070] For adjusting the pH value of the hydrolyzate, oxalic acid is used to adjust the pH value to 5.5.

[0071] The TiO 2 The mass ratio to silane coupling agent KH570 is 15:2.

[0072] The reaction is carried out under the condition of magnetic stirring, the reaction temperature is 60° C., and the reaction time is 3 h. Before starting the reaction, ultrasonic dispersion is required for 10 minutes to disperse the graphene oxide before modification evenly.

[0073] The separation an...

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Abstract

The invention discloses an epoxy resin-PTFE / TiO2 / graphene oxide composite coating and a preparation method thereof, and relates to the field of composite material preparation. The composite coating comprises epoxy resin, PTFE, TiO2 and graphene oxide. The preparation method comprises the following steps: (1) adding the PTFE into n-butanol, and performing uniform dispersion to form a PTFE dispersion liquid; (2) adding the TiO2; (3) adding the graphene oxide and polyvinylpyrrolidone; (4) adding the dispersion liquid obtained in the step (3) into the epoxy resin, and adding a curing agent; and (5) coating the surface of a substrate by the dispersion liquid obtained in the step (4) to form a film, and performing heating curing to obtain the epoxy resin-PTFE / TiO2 / graphene oxide composite coating. According to the coating and method provided by the invention, excellent performance of each kind of nano particles can be fully exerted by modification, and the epoxy resin-PTFE / TiO2 / graphene oxide composite coating has greatly-improved bonding strength, hardness, corrosion resistance and tribological properties.

Description

technical field [0001] The invention belongs to the field of composite material preparation, in particular to an epoxy resin-PTFE / TiO 2 / graphene oxide composite coating and preparation method thereof. Background technique [0002] The loss caused by friction will not only cause energy loss and waste of resources, but also reduce the accuracy, reliability and stability of mechanical parts due to the wear and tear of materials. Makes sense for normal use. [0003] Traditional anti-friction film materials often have problems such as insufficient hardness, uneven distribution of composite materials, and poor corrosion resistance. [0004] Although PTFE is a material with excellent performance, the addition of PTFE will cause the hardness of the coating to decrease, so it is necessary to modify the epoxy resin-PTFE composite coating by other means; TiO 2 Is a very good nanoparticle to improve the hardness of the coating, however TiO 2 The presence of hydroxyl groups on the s...

Claims

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Application Information

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IPC IPC(8): C09D127/18C09D163/00C09D5/08C09D7/62
CPCC08K2003/2241C09D5/08C09D7/62C09D127/18C08L63/00C08K9/06C08K3/042C08K3/22
Inventor应丽霞吴春喜谢越付振王桂香
OwnerHARBIN ENG UNIV