Polytetrafluoroethylene-based core-shell nano composite material as well as preparation method and application thereof

A polytetrafluoroethylene-based, nano-composite material technology, which is applied in the direction of lubricating compositions, additives, petroleum industry, etc., can solve the problems of self-lubricating performance impact, polytetrafluoroethylene damage, etc., and achieve low raw material cost, environmental friendliness, The effect of simple process

Active Publication Date: 2020-06-16
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of PTFE after irradiation and plasma treatment has been damaged, which will inevitably affect its self-lubricating properties.

Method used

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  • Polytetrafluoroethylene-based core-shell nano composite material as well as preparation method and application thereof
  • Polytetrafluoroethylene-based core-shell nano composite material as well as preparation method and application thereof
  • Polytetrafluoroethylene-based core-shell nano composite material as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0035] The present invention also provides a method for preparing the polytetrafluoroethylene-based core-shell nanocomposite described in the above technical solution, comprising the following steps:

[0036] 1) Under protective atmosphere, polytetrafluoroethylene emulsion, the first monomer, the second monomer, the first initiator, the second initiator and water are mixed, carry out polymerization reaction, in described polytetrafluoroethylene emulsion A polymer layer is formed on the surface of the polytetrafluoroethylene latex particles;

[0037] 2) Mix the polymerization reaction product obtained in the step 1), ethanol, water, ammonia water and silicon source reagent, carry out hydrolysis and condensation reaction, form a silicon dioxide layer on the surface of the polymer layer, and obtain the polytetrafluoroethylene Core-shell nanocomposites.

[0038] Under the protective atmosphere, the present invention mixes the polytetrafluoroethylene emulsion, the first monomer, t...

Embodiment 1

[0052] (a) Emulsion polymerization of the inner shell:

[0053] Add 10mL of PTFE emulsion and 80mL of deionized water into a five-necked flask for ultrasonic dispersion, stir at room temperature for 30min under nitrogen atmosphere, and the stirring rate is 250rpm, then raise the temperature to 70°C, the heating rate is 10°C / min, and start to drop slowly For 10mL of methyl methacrylate, the rate of addition is 10s / drop. After the addition, keep the temperature for 400min, slowly add 30mL of potassium persulfate initiator aqueous solution (dissolved with 0.1g of potassium persulfate), and the rate of addition is 12s / drop. , keep the temperature for 240min after the dropwise addition. Adjust the pH to 7 with a buffer solution of disodium hydrogen phosphate and sodium dihydrogen phosphate, and slowly add 5 mL of vinyltrimethoxysilane and 10 mL of potassium persulfate aqueous solution (dissolved with 0.05 g of potassium persulfate) dropwise at the same time. 12s / drop, continue to ...

Embodiment 2

[0066] (a) Emulsion polymerization of the inner shell:

[0067] Add 10mL of PTFE emulsion and 100mL of deionized water into a five-neck flask for ultrasonic dispersion, stir at room temperature for 30min under nitrogen atmosphere, and the stirring rate is 300rpm, then raise the temperature to 75°C, the heating rate is 10°C / min, and start to slowly drop 10mL of butyl acrylate, the rate of addition is 12s / drop, keep the temperature for 2 hours after the addition, slowly add 30mL of potassium persulfate initiator aqueous solution (dissolved with 0.1g of potassium persulfate), the rate of addition is 10s / drop, drop After the addition, keep the temperature constant for 2h. Adjust the pH to 7 with a buffer solution of disodium hydrogen phosphate and sodium dihydrogen phosphate, and slowly add 5 mL of γ-methacryloxypropyl trimethoxysilane and 10 mL of potassium persulfate aqueous solution (dissolved with 0.05 g of potassium persulfate) ), the dropping rate is 12s / drop, continue to s...

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Abstract

The invention provides a polytetrafluoroethylene-based core-shell nano composite material as well as a preparation method and application thereof, and belongs to the technical field of polymer composite materials. According to the polytetrafluoroethylene-based core-shell nano composite material provided by the invention, polytetrafluoroethylene latex particles are used as a core, a polymer layer obtained by polymerization reaction of a first monomer, a second monomer, a first initiator, a second initiator and water is used as a first shell layer, and a silicon dioxide layer obtained by hydrolysis condensation reaction of the polymer layer, ethanol, water, ammonia water and a silicon source reagent is used as a second shell layer. The polytetrafluoroethylene-based core-shell nano compositematerial provided by the invention has excellent self-lubricating property, high chemical activity and high wear resistance under the condition that a C-F molecular chain skeleton is not damaged.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to a polytetrafluoroethylene-based core-shell nanocomposite material and its preparation method and application. Background technique [0002] As an important solid lubricant, polytetrafluoroethylene (PTFE) has played an important role in the fields of aviation, aerospace and automobiles. However, the creep resistance and wear resistance of polytetrafluoroethylene are poor, so its service life under severe working conditions cannot meet the technical requirements. [0003] Chinese patent CN201610058400.7 discloses a preparation method of nano-β-manganese dioxide-graphite oxide-polytetrafluoroethylene wear-resistant and friction-reducing composite material. In order to improve the compatibility with the matrix, the surface of polytetrafluoroethylene UV radiation treatment. Similarly, in order to improve the surface activity of PTFE, the Chinese patent CN20161005...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08F220/14C08F220/18C08F230/08C10M161/00C08L27/18
CPCC08F220/14C08F220/18C08J3/128C08J2327/18C10M161/00C10M2201/105C10M2213/062C08F230/08
Inventor 王宏刚王娜王金清任俊芳高贵陈生圣赵更锐杨亚文王瑾沈家骕
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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