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Preparation method of continuous long bulked polytetrafluoroethylene panel

A polytetrafluoroethylene and polytetrafluoroethylene film technology, which is applied in the field of plastic processing, can solve problems such as low efficiency, length and width limitations, and achieve the effect of improving production efficiency and simplifying the lamination process.

Active Publication Date: 2013-03-20
SHANGHAI PLASTICS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although continuous long biaxially stretched sealing tape can be obtained by this method, the method is limited by length and width, and longer and wider tapes need to be produced, which requires large-scale equipment protection. In addition, this method is inefficient, and only one time Capable of producing one continuous long strip

Method used

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  • Preparation method of continuous long bulked polytetrafluoroethylene panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) The dispersed polytetrafluoroethylene resin is prepared into a calendered film by a paste molding method, and the expanded polytetrafluoroethylene film 2 is obtained through biaxial stretching. The thickness of the film is 0.05 mm, and it is directly coated on the surrounding steel belt 3 from the biaxial stretching machine 1. The surrounding steel belt 3 is 30 m long, 900 mm wide, and 0.2 mm thick. Adjust the rotation speed of the surrounding steel belt 3 to keep consistent with the forward speed of the bidirectional stretching machine 1, and the speed is 5 m / min. The steel belt 3 makes a circular motion to wrap the polytetrafluoroethylene film around the stack, a total of 30 laps, and fix the polytetrafluoroethylene film on the steel belt 3 after the wrapping is completed.

[0018] (2) Put the steel strip 3 coated with polytetrafluoroethylene film obtained in step (1) into a sintering furnace, heat it to 385° C. and keep it for 8 hours, turn off the electric heati...

Embodiment 2

[0021] (1) Dispersed polytetrafluoroethylene resin is prepared into a calendered film by a paste molding method, and an expanded polytetrafluoroethylene film is obtained through biaxial stretching. The thickness of the film is 0.1 mm, and it is directly coated on the surrounding steel belt 3 from the biaxial stretching machine 1. The surrounding steel belt 3 is 30 m long, 900 mm wide, and 0.2 mm thick. Adjust the rotation speed of the surrounding steel belt 3 to keep consistent with the forward speed of the bidirectional stretching machine 1, and the speed is 5 m / min. The steel belt 3 makes a circular movement to wrap the polytetrafluoroethylene film around the stack, a total of 40 laps, and fix the polytetrafluoroethylene film on the steel belt after the wrapping is completed.

[0022] (2) Put the steel strip coated with polytetrafluoroethylene film obtained in step (1) into a sintering furnace, heat it to 385° C. for 12 hours, turn off the electric heating and freely cool to...

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Abstract

The invention relates to a preparation method of a continuous long bulked polytetrafluoroethylene panel. The method comprises the following steps of: directly coating a set biaxially-oriented polytetrafluoroethylene film from a biaxial orientation machine to a surrounding steel belt; controlling a rotary speed of the surrounding steel belt to be accordant with a forward speed of the biaxial orientation machine, wherein the speed is 2 to 10 metres per minute; after finishing coating, putting a steel belt coil which is coated with the polytetrafluoroethylene film into a sintering furnace for sintering, wherein a temperature is 350 to 390 DEG C and heat preservation time is 5 to 20 h, and naturally cooling to room temperature; and taking down a sintered bulked polytetrafluoroethylene panel from the steel belt to obtain the continuous long bulked polytetrafluoroethylene panel. The continuous long bulked polytetrafluoroethylene panel is produced by using the method, so overlapped processes are greatly simplified, the length of the continuous long bulked polytetrafluoroethylene panel is not influenced by equipment, and production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of plastic processing, and in particular relates to a preparation method of a continuous long expanded polytetrafluoroethylene plate. Background technique [0002] PTFE material has the advantages of corrosion resistance, weather resistance, high and low temperature resistance, etc. It is widely used in important sectors such as national defense, atomic energy, petroleum, radio, electrical machinery, chemical industry, etc., and has the reputation of "King of Plastics". Compared with traditional molded or extruded PTFE materials, expanded PTFE has lower density and stronger creep resistance, while retaining many physical and chemical properties of traditional PTFE, it is an ideal gasket sheet material. [0003] US Patent No. 5,964,465 describes a method for forming a continuous long low-creep polytetrafluoroethylene sealing tape, which wraps a film on a cylinder, and after sintering, spirally cuts it into a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D7/01B29K27/18
Inventor 高亦岚姚磊刘华新
Owner SHANGHAI PLASTICS RES INST CO LTD
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