Manufacturing method of polytetrafluoroethylene sealing sheet or sealing strip for aircraft hatch cover

A technology of polytetrafluoroethylene and its production method, which can be used in household seals, chemical instruments and methods, applications, etc., and can solve the problems of lack of elasticity, lack of elasticity, and stiffness of sealing materials

Inactive Publication Date: 2020-03-06
嘉善东方氟塑有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high-temperature hot pressing of the produced board, the fibers of tetrafluoroethylene are still in a state of straightness, stiffness and lack of elasticity when stretched. It is simply a layer of polytetrafluoroethylene base film. The physical pressing (bonding) together, obviously, as a sealing material also lacks elasticity, it is not an ideal sealing material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Choose polytetrafluoroethylene dispersion resin with a molecular weight of more than 30,000 as the raw material. After screening the raw materials, add 10% of the total amount of aviation kerosene for mixing to form a mixed material → put the mixed material in a constant temperature oven at 40°C Insulate for 24 hours to allow aviation kerosene to fully penetrate into the raw material → make a billet into a cylindrical billet → put the billet in an oven at 50°C for 24 hours → extrude into a strip-shaped billet → put the strip-shaped billet into the calender In the machine, extrude the strip-shaped flat billet → degrease the billet at 260°C to remove aviation kerosene in the billet → stretch the flat billet to a thickness of 0.2mm under the environment of 300°C The strip material is stretched at a ratio of 6 times, and rolled up, and enters a constant temperature box at 100°C → then biaxially stretched at an environment of 180°C, the ratio of biaxial stretching is 6 times,...

Embodiment 2

[0011] Select polytetrafluoroethylene dispersion resin with a molecular weight of more than 30,000 as the raw material. After screening the raw materials, add 20% of the total amount of aviation kerosene for mixing to form a mixed material → put the mixed material in a constant temperature oven at 60°C Insulate for 24 hours to allow aviation kerosene to fully penetrate into the raw material → punch the billet into a cylindrical billet → put the billet in an oven at 80°C for 24 hours → extrude into a strip-shaped billet → put the strip-shaped billet into the calender In the machine, extrude the strip-shaped flat billet → degrease at 280°C to remove the aviation kerosene in the billet → stretch the flat billet to a thickness of 0.2mm at 360°C The tape is stretched at a ratio of 9 times, and rolled, and enters a constant temperature box at 150°C → then biaxially stretched at 280°C, the ratio of biaxial stretching is 9 times, and the thickness is 0.03mm film material → Immediately...

Embodiment 3

[0013] Choose polytetrafluoroethylene dispersion resin with a molecular weight above 30,000 as the raw material. After the raw material is screened, add 15% of the total amount of aviation kerosene for mixing to form a mixed material → put the mixed material in a constant temperature oven at 50°C Insulate for 24 hours to allow aviation kerosene to fully penetrate into the raw material → make a billet into a cylindrical billet → put the billet in an oven at 70 ° C for 24 hours → extrude into a strip-shaped billet → put the strip-shaped billet into the calender In the machine, extrude the strip-shaped flat billet → degrease at 270°C to remove the aviation kerosene in the billet → stretch the flat billet to a thickness of 0.2mm at 340°C The strip material is stretched at a ratio of 7 times, and rolled up, and enters a constant temperature box at 130°C → then biaxially stretched at 230°C, the ratio of biaxial stretching is 7 times, and the thickness is 0.03mm film material → Immed...

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Abstract

The invention discloses a manufacturing method of a polytetrafluoroethylene sealing sheet or sealing strip for an aircraft hatch cover. Polytetrafluoroethylene dispersion resin with the molecular weight of 30000 or above is selected as a raw material, aviation kerosene is added and mixed, the mixture is put into a thermostat for heat preservation, a blank is made in a knocking mode, the blank is put into the thermostat for heat preservation, extrusion molding is carried out to form a blank, the blank is extruded into a strip-shaped flat blank, degreasing and unidirectional stretching are carried out, the flat blank is put into the thermostat, a film material is formed after bidirectional stretching, the film material is moved into a setting furnace for setting and rolled, and multiple layers of the film materials are overlapped, put into a bulking furnace for bulking, and compounded to form an integrated wide sheet material, the wide sheet material is cut into needed flaky or strip-shaped product specifications, and packaging and warehousing are carried out after quality inspection. The whole processing technology is beneficial to continuous and batch work of a production line, production efficiency is high, the quality is guaranteed, the main performance indexes are superior to those of existing similar products, and high-quality sealing materials are provided for aircraft andother aviation and aerospace equipment.

Description

technical field [0001] The invention relates to a method for manufacturing a sealing member, in particular to a method for manufacturing a polytetrafluoroethylene sealing sheet or sealing strip used for sealing on an aircraft port cover. Background technique [0002] Seals are very commonly used parts in engineering design, including water seals, oil seals, and gas seals. Many seals also need to withstand certain pressure and high or low temperature. For the sealing of aviation equipment, the requirements are higher, especially the weather resistance for more than 50 years, flame retardancy, high temperature resistance of 260 ° C and ultra-low temperature resistance of -160 ° C, and long-term maintenance of dynamic and static pressure. The seal is not deformed, and ordinary rubber and plastic materials cannot meet such harsh requirements. For most of the flap seals and strips on civil aircraft, they can only be made of high-grade rubber and plastic materials, but the servic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D99/00B29C55/06B29C55/12B32B37/06B32B37/10B32B43/00
CPCB29C55/06B29C55/12B29D99/0053B29K2027/18B32B37/06B32B37/10B32B43/003B32B2307/712B32B2307/714B32B2581/00B32B2605/18
Inventor 于文根包伟勇
Owner 嘉善东方氟塑有限公司
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