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Composite intermediate layer sliding plate with filled polytetrafluoroethylene and method for preparing the same

A polytetrafluoroethylene layer and polytetrafluoroethylene technology, which is used in bridge parts, bridges, buildings, etc., can solve the problem of low compressive strength of pure polytetrafluoroethylene plates, large vertical deformation of bearings, and unfavorable sliding of bearings. It can achieve the effect of low friction coefficient, conducive to bearing sliding, and small compression deformation.

Active Publication Date: 2009-07-29
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the pure PTFE plate has low bearing strength and large creep, which leads to large vertical deformation of the bearing under long-term pressure; the pressure bearing performance of the filled PTFE plate is improved, but its High coefficient of friction is not conducive to support slippage

Method used

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  • Composite intermediate layer sliding plate with filled polytetrafluoroethylene and method for preparing the same
  • Composite intermediate layer sliding plate with filled polytetrafluoroethylene and method for preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The raw material composition and mass percentage of the modified polytetrafluoroethylene layer filled in the middle layer 2 are: polytetrafluoroethylene 72%, carbon fiber 20%, MoS 2 5%, cadmium oxide 3%.

[0030] Weigh each component, put it into a high-speed mixer and mix evenly; use compression molding, fill the mold with material, the upper and lower surface layers are made of pure polytetrafluoroethylene material, the middle layer is filled with modified polytetrafluoroethylene material, and the thickness of the middle layer is 60% of the total thickness, the thickness of the upper and lower surface layers is the same, pressurize on the press, the pressure is 45MPa, hold the pressure for 5min, and release the mold to obtain the blank; put the blank into a polytetrafluoroethylene sintering furnace for sintering, slowly heat up, and the sintering temperature is 370 ℃, the sintering time is 2h, the temperature is lowered to 320°C and kept for 1h, and then slowly coole...

Embodiment 2

[0032] The raw material composition and mass percentage of the modified polytetrafluoroethylene layer filled in the middle layer 2 are 65% polytetrafluoroethylene, 30% glass fiber, 4% polyphenylene, and 1% graphite.

[0033] Weigh each component, put it into a high-speed mixer and mix evenly; use compression molding, fill the mold with material, the upper and lower surface layers are made of pure polytetrafluoroethylene material, the middle layer is filled with modified polytetrafluoroethylene material, and the thickness of the middle layer is 70% of the total thickness, the thickness of the upper and lower surface layers is the same, pressurize on the press, the pressure is 60MPa, hold the pressure for 6min, and release the mold to obtain the blank; put the blank into a polytetrafluoroethylene sintering furnace for sintering, slowly heat up, and the sintering temperature is 360 ℃, the sintering time is 2h, the temperature is lowered to 320°C and kept for 1h, and then slowly co...

Embodiment 3

[0035] The raw material composition and mass percentage of the modified polytetrafluoroethylene layer filled in the middle layer 2 are: polytetrafluoroethylene 95%, carbon fiber 4%, MoS 2 1%.

[0036] Weigh each component, put it into a high-speed mixer and mix evenly; use compression molding, fill the mold with material, the upper and lower surface layers are made of pure polytetrafluoroethylene material, the middle layer is filled with modified polytetrafluoroethylene material, and the thickness of the middle layer is 65% of the total thickness, the thickness of the upper and lower surface layers is the same, pressurize on the press, the pressure is 30MPa, hold the pressure for 2min, and release the mold to obtain the blank; put the blank into a polytetrafluoroethylene sintering furnace for sintering, slowly heat up, and the sintering temperature is 380 ℃, the sintering time is 1.5h, the temperature is lowered to 320°C and kept for 1h, and then slowly cooled to room tempera...

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Abstract

The invention belongs to the technical field of composite modification of high molecular materials, and provides a filling polyfluortetraethylene composite interlayer slide board for a bridge support and a preparation method thereof. The filling polyfluortetraethylene composite interlayer slide board adopts a three-layer composite structure, wherein, the middle layer is a filling modified polyfluortetraethylene layer, the upper surface layer and the lower surface layer are pure polyfluortetraethylene layers, namely, the integral bearing capacity of the slide board is improved by mainly utilizing the filling modified polyfluortetraethylene layer in the middle layer with the characteristics of high bearing capacity and small creepage; and the surface layers are the pure polyfluortetraethylene layers, so that the slide board keeps the low frictional coefficient property of the pure polyfluortetraethylene. The filling polyfluortetraethylene composite interlayer slide board has the characteristics of low frictional coefficient, high bearing capacity, small creepage and small compressive deformation, can meet the requirement of high-speed railway bridge supports on frictional pair materials, can be widely applied to the frictional pair materials used as bridge support products, and can also be applied to other fields such as pipeline supports and the like.

Description

technical field [0001] The invention belongs to the technical field of composite modification of polymer materials, and in particular relates to a polytetrafluoroethylene composite interlayer sliding plate filled with bridge supports and a preparation method thereof. Background technique [0002] With the development of my country's transportation industry, bridge construction has also entered a period of rapid development. Bridge bearings are an important part of bridge structures. With the emergence of various bridge-type long-span bridges, higher requirements are put forward for the bearing capacity of bridge supports and the ability to adapt to displacement and rotation angle. At present, pot rubber bearings and spherical bearings are the two most widely used bridge bearings. [0003] The friction pair material of the bearing is an important part of the bridge bearing to realize the sliding function. my country's "GB20688.4-2007 Rubber Bearings Part 4: Ordinary Rubber...

Claims

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Application Information

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IPC IPC(8): E01D19/04B29C43/20B29C43/58B29K27/18
Inventor 冯刚宪宋建平刘绍辉
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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