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Polytetrafluoroethylene (PTFE) outer lining butterfly plate making method

A technology of polytetrafluoroethylene and butterfly plate, which is applied in the field of chemistry and chemical industry, can solve the problems of low molding rate of molding and sintering and low density of butterfly plate

Inactive Publication Date: 2014-07-02
TIANJIN BINHAI JINHANG CERAMIC VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patented butterfly valve spool PTFE outer lining blank is sintered once, but it does not solve the problems of low mold compression sintering rate and low butterfly plate density.

Method used

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  • Polytetrafluoroethylene (PTFE) outer lining butterfly plate making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] a. Place the polytetrafluoroethylene suspension powder and the metal plate core in the mold, and the metal plate core is located on the axis of the mold;

[0014] b. Put the mold into the press, pressurize to 19Mpa, hold the pressure for 100 minutes, and then demould to obtain the semi-finished butterfly plate;

[0015] c. Put the semi-finished butterfly plate above into the sintering furnace, raise the sintering temperature from room temperature to 130°C, keep it warm for 85 minutes, then raise the temperature to 220°C, keep it warm for 240 minutes, then raise the temperature to 330°C, keep it warm for 110 minutes, and then raise the temperature to 360°C, hold for 130 minutes, then raise the temperature to 375°C, hold for 430 minutes, cool down to 360°C, hold for 130 minutes, then cool down to 330°C, hold for 110 minutes, then cool down to 220°C, hold for 240 minutes, then cool down to 130°C ℃, heat preservation for 85 minutes, and then cooled to room temperature to ob...

Embodiment 2

[0017] a. Place the polytetrafluoroethylene suspension powder and the metal plate core in the mold, and the metal plate core is located on the axis of the mold;

[0018] b. Put the mold into the press, pressurize to 20Mpa, hold the pressure for 70 minutes, and then demould to obtain the semi-finished butterfly plate;

[0019] c. Put the semi-finished butterfly plate above into the sintering furnace, raise the sintering temperature from room temperature to 138°C, keep it for 78 minutes, then raise the temperature to 235°C, keep it for 245 minutes, then raise the temperature to 340°C, keep it for 95 minutes, and then raise the temperature to 364°C, hold for 127 minutes, then raise the temperature to 386°C, hold for 460 minutes, cool down to 364°C, hold for 127 minutes, then cool down to 340°C, hold for 95 minutes, then cool down to 235°C, hold for 245 minutes, then cool down to 138 ℃, heat preservation for 78 minutes, and then cooled to room temperature to obtain the finished bu...

Embodiment 3

[0021] a. Place the polytetrafluoroethylene suspension powder and the metal plate core in the mold, and the metal plate core is located on the axis of the mold;

[0022] b. Put the mold into the press, pressurize to 21Mpa, hold the pressure for 60 minutes, and then demould to obtain the semi-finished butterfly plate;

[0023] c. Put the semi-finished butterfly plate above into the sintering furnace, raise the sintering temperature from room temperature to 150°C, keep it warm for 75 minutes, then raise the temperature to 250°C, keep it warm for 255 minutes, then raise the temperature to 345°C, keep it warm for 106 minutes, and then raise the temperature to 370°C, hold for 120 minutes, then raise the temperature to 390°C, hold for 440 minutes, cool down to 370°C, hold for 130 minutes, then cool down to 345°C, hold for 106 minutes, then cool down to 250°C, hold for 255 minutes, then cool down to 150 ℃, heat preservation for 75 minutes, and then cooled to room temperature to obtai...

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Abstract

The invention provides a polytetrafluoroethylene (PTFE) outer lining butterfly plate making method which is characterized by comprising the following steps: A. placing PTFE suspension powder and a metal board core inside a die with the metal board core in a die centre shaft; B. placing the die in a press, pressurizing to 19-21Mpa with the pressure holding time of 60-100 minutes, then demolding to obtain a butterfly plate semi-finished product; and C. putting the butterfly plate semi-finished product into a sintering furnace for multi-segment sintering for moulding to obtain a butterfly plate product. After the multi segment sintering for moulding, the butterfly plate mould pressing sintering moulding rate can reach more than 85%. After the metal board core is coated with the PTFE suspension powder, no arc phenomenon is produced in PTFE surface and the metal board core which is internally coated in the PTFE surface by 20000 volt electric shock test, so that the PTFE surface is qualified in density. If the PTFE surface is not qualified in density, arc phenomena may be produced. The valve plate surface water drop seepage phenomenon can be tested by use of 1.1Mpa of water pressure, the pressure is held for 3 minutes, and no water drop is seeped, so that a valve plate is qualified by a water pressure seal test.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a preparation method of a polytetrafluoroethylene-lined butterfly plate. Background technique [0002] At present, the existing anti-corrosion butterfly valve plates in China are made of polyperfluoroethylene injection-molded fluorine materials. Compared with polytetrafluoroethylene, this material has 50°C lower temperature resistance and slightly worse corrosion resistance, which cannot meet the needs of users. However, the butterfly plate made of polytetrafluoroethylene combined with the metal plate core is limited by its manufacturing method, the molding rate of molding and sintering is low, the density of the butterfly plate is low, and the relevant technical indicators cannot meet the requirements for use. Chinese patent 91102247.3 discloses a polytetrafluoroethylene outer lining molding method for a butterfly valve core, which is char...

Claims

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Application Information

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IPC IPC(8): B29C69/00B29C67/04B29C43/02
Inventor 曹大鸣
Owner TIANJIN BINHAI JINHANG CERAMIC VALVE
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