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Preparation method of graphene/nylon reinforced toughened composite material for center wear plates of railway freight wagons

A railway freight car, strengthening and toughening technology, which is applied in the field of preparation of graphene/nylon reinforced and toughened composite materials, can solve the problems of reducing the service life of the core disk wear plate, affecting the safety of the car body operation, and increasing the frequency of replacement. Easy to operate, prevent aggregation, reduce frictional resistance

Inactive Publication Date: 2018-01-19
青岛万林橡塑科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The frictional resistance of the center disc wear plate restricts the lateral movement of the car body to a certain extent, which will affect the safety of the car body; in severe cold areas, the probability of damage to the injection molded center disc wear disc will be greatly increased, which reduces the risk of damage to the center disc wear disc. service life, increasing the frequency of replacement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, a preparation method of a graphene / nylon reinforced and toughened composite material used for the wear disc of the center disc of a railway freight car includes the following steps:

[0020] (1) Add γ(2,3-glycidoxy)propyltrimethoxysilane coupling agent to the graphene slurry, and use the coupling agent to disperse the graphene in a high-speed shear emulsifier. Cutting speed is 10000r / min, time is 1.5h, then vacuum drying to constant weight, drying temperature is 80℃; the weight percentage of graphene solid content in graphene slurry is 5%, and the amount of coupling agent added is graphene The solid content is 1.5% by weight.

[0021] (2) Add 5% of graphene treated with coupling agent to 94.6% by weight of nylon 6, and 0.4% of 3,5-di-tert-butyl-4-hydroxyphenylpropionyl-hexamethylenediamine is thermally stable Mix it evenly on a high-speed mixer with a rotation speed of 5000r / min and then add it to the Hacker internal mixer for banburying. The temperature...

Embodiment 2

[0025] In this embodiment, a preparation method of a graphene / nylon reinforced and toughened composite material used for the wear disc of the center disc of a railway freight car includes the following steps:

[0026] (1) Add γ(2,3-glycidoxy)propyltrimethoxysilane coupling agent to the graphene slurry, and use the coupling agent to disperse the graphene in a high-speed shear emulsifier. Cutting speed is 10000r / min, time is 1.5h, then vacuum drying to constant weight, drying temperature is 80℃; the weight percentage of graphene solid content in graphene slurry is 5%, and the amount of coupling agent added is graphene The solid content is 1.5% by weight.

[0027] (2) Add 5% of graphene treated with coupling agent to 94.6% by weight of nylon 6, and 0.4% of 3,5-di-tert-butyl-4-hydroxyphenylpropionyl-hexamethylene diamine heat stabilizer , After mixing evenly on a high-speed mixer with a rotation speed of 5000r / min, add it to the Hacker internal mixer for banburying. The internal mixer...

Embodiment 3

[0031] In this embodiment, a preparation method of a graphene / nylon reinforced and toughened composite material used for the wear disc of the center disc of a railway freight car includes the following steps:

[0032] (1) Add γ(2,3-glycidoxy)propyltrimethoxysilane coupling agent to the graphene slurry, and use the coupling agent to disperse the graphene in a high-speed shear emulsifier. Cutting speed is 10000r / min, time is 1.5h, then vacuum drying to constant weight, drying temperature is 80℃; the weight percentage of graphene solid content in graphene slurry is 5%, and the amount of coupling agent added is graphene The solid content is 1.5% by weight.

[0033] (2) Add 5% of graphene treated with coupling agent to 94.6% by weight of nylon 6, and 0.4% of 3,5-di-tert-butyl-4-hydroxyphenylpropionyl-hexamethylene diamine heat stabilizer , After mixing evenly on a high-speed mixer with a rotation speed of 5000r / min, add it to the Hacker internal mixer for banburying. The internal mixer...

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Abstract

The invention discloses a preparation method of a graphene / nylon reinforced toughened composite material for center wear plates of railway freight wagons. The preparation method comprises the following steps: (1) dispersing graphene by a coupling agent; (2) mixing the treated graphene, nylon, and a heat stabilizer in a high-speed mixer, and then adding the obtained mixture into an internal mixer for internal mixing; (3) through the method that the material subjected to internal mixing are sheared by a high-speed shearing machine or are tableted and crushed, dividing the mixed material into a granular or flaky material which is uniform in size, and is used as a master batch; and (4) mixing the master batch, the nylon, the heat stabilizer and a toughening agent in a high-speed mixer, and then adding the obtained mixture into a double-screw extruder for extrusion and granulation to prepare the graphene / nylon reinforced toughened composite material. The composite material prepared by the invention has high strength, excellent low-temperature toughness and high abrasive resistance, reduces the damage rate of the center wear plates of railway freight wagons, prolongs the service life ofthe center wear plates, and increases the operation safety of the railway freight wagon body, therefore, the graphene / nylon reinforced toughened composite material prepared by the method disclosed bythe invention has a wide market application prospect.

Description

Technical field [0001] The invention relates to the field of polymer / inorganic compound high-performance nanocomposite materials. Specifically, nylon, graphene and other additives are melt-blended with the aid of mechanical external force using a Hack internal mixer and a twin-screw extruder to obtain A preparation method of graphene / nylon reinforced and toughened composite material. Background technique [0002] Nylon resin for wear discs of railway freight cars has high mechanical strength, self-lubrication, heat resistance and chemical corrosion resistance, but its shortcomings, such as easy absorption of water, cause material strength to decrease and friction coefficient to increase. Shortcomings such as poor low-temperature performance restrict the service life of the nylon core wear disc of railway freight cars. [0003] The injection-molded core plate wear disc is one of the important parts of railway freight cars. The core plate wear disc of railway freight cars is the key...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L51/04C08K9/06C08K3/04C08K5/20C08K5/526C08J3/22C08J3/20
Inventor 郑丛丛韩立静
Owner 青岛万林橡塑科技有限公司