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A kind of filling modified PTFE sealing plate and preparation method thereof

A sheet and modification technology, applied in the field of filling and modified PTFE sealing sheet and its preparation, can solve the problems of unsatisfactory sealing performance, poor ability to resist creep relaxation and cold phenomenon, etc., so as to reduce creep relaxation or cold phenomenon. , good tensile breaking strength and crushing strength, and the effect of reducing the content

Active Publication Date: 2018-02-06
NIPPON VALQUA IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the defects of the existing filled and modified polytetrafluoroethylene sealing materials are that the content of polytetrafluoroethylene is relatively high, and for the filled and modified PTFE sealing plate gasket, there is poor ability to resist creep relaxation and coldness, and the subsequent Or the sealing performance is not ideal, and there are few sealing gaskets with low creep relaxation and high sealing performance

Method used

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  • A kind of filling modified PTFE sealing plate and preparation method thereof
  • A kind of filling modified PTFE sealing plate and preparation method thereof
  • A kind of filling modified PTFE sealing plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: Prepare a kind of filling modified PTFE sealing plate

[0047] (1) Stirring and mixing: 47 wt% of powdery dispersed polytetrafluoroethylene (PTFE fine powder CD-1 manufactured by Asahi Glass Co., Ltd.), 50 wt% of SiO with an average particle size of 9 to 13 μm 2 Mix and stir with 3wt% mean particle diameter 5~9 μ m flat talcum powder (three total amount 100wt%), add the processing aid (ISOPAR C of Exxon Mobil) of aforementioned material total amount 23wt% in the stirring process , and stir until a homogeneous mixture is formed;

[0048] (2) Preforming: at room temperature (25°C), extrude with an extruder with a die size of 300mm×20mm to make a preformed body;

[0049] (3) Rolling: Roll the above-formed preform with a biaxial roll under the conditions of a roll diameter of 700 mm, a roll spacing of 20 mm, a roll surface moving speed of 10 mm / s, and a roll temperature of 80° C.; finally, the roll spacing is adjusted to 1.5 mm, rolled to obtain a sheet with a...

Embodiment 2

[0054] Embodiment 2: Prepare a kind of filling modified PTFE sealing plate

[0055] (1) stirring and mixing: the average particle diameter of 55wt% dispersing polytetrafluoroethylene (PTFE fine powder CD-1 produced by Asahi Glass Co., Ltd.), 27wt% average particle diameter is 16-20 μ m mullite and 18wt% average particle diameter is 11-15 μm flaky talcum powder (the total amount of the three 100wt%) is mixed and stirred, and the ISOPAR C processing aid of ExxonMobil with a total amount of the aforementioned materials of 14wt% is added during the stirring process, and stirred until a uniform mixture is formed;

[0056] (2) Preforming: at room temperature (25°C), extrude with an extruder with a die size of 300mm×20mm to make a preformed body;

[0057] (3) Rolling: Roll the above-formed preformed body with two-axis rolls under the conditions of roll diameter 700mm, roll spacing 20mm, roll surface moving speed 50mm / sec, and roll temperature 60°C; finally adjust the roll spacing to ...

Embodiment 3

[0062] Embodiment 3: Prepare a kind of filling modified PTFE sealing plate

[0063] (1) Stirring and mixing: 47wt% powdery dispersed polytetrafluoroethylene (PTFE fine powder CD-1 manufactured by Asahi Glass Co., Ltd.), 51wt% kaolin with an average particle diameter of 18-22 μm and 2wt% average particle diameter of 3-7 μm Flake talcum powder (the total amount of the three 100wt%) is mixed and stirred, and the ISOPAR C processing aid of ExxonMobil with a total amount of the aforementioned materials of 16wt% is added during the stirring process, and stirred until a uniform mixture is formed;

[0064] (2) Preforming: at room temperature (25°C), extrude with an extruder with a die size of 300mm×20mm to make a preformed body;

[0065] (3) Rolling: Roll the preform formed above with two-axis rolls under the conditions of roll diameter 700mm, roll spacing 20mm, roll surface moving speed 30mm / sec, and roll temperature 40°C; finally adjust the roll spacing to 1.5 mm, rolled to obtain ...

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Abstract

The invention relates to a filling-modified PTFE (polytetrafluoroethylene) sealing plate comprising the following raw material components: 30-70wt% of PTFE, 10-60wt% of silicon-containing substances and 2-25wt% of talcum powder. The preparation process of the filling-modified PTFE sealing plate comprises the steps of (1) mixing and stirring all raw materials, and adding a processing aid in the stirring process to form a uniform mixture; (2) extruding and forming the mixture by using an extruder to form a pre-formed body; (3) rolling the formed pre-formed body by using a roller to form a sheet; (4) drying and removing the processing aid; and (5) sintering to obtain the filling-modified PTFE sealing plate. The filling-modified PTFE sealing plate prepared by the invention has the characteristics of low PTFE dosage and also has low creep relaxation and high sealing performance.

Description

technical field [0001] The invention relates to a filled modified PTFE sealing plate and a preparation method thereof, in particular to a filled modified PTFE sealing plate with low creep and high sealing performance and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene is a perfluorinated polymer obtained by free radical polymerization of monomer tetrafluoroethylene. Due to its special structural characteristics, it has high chemical stability, strong high and low temperature resistance, and outstanding Non-viscous, good lubricity, beneficial electrical insulation, aging resistance, minimal water absorption, etc., and a wide range of operating temperatures, widely used as various seals. However, a single PTFE material has poor mechanical properties, a large linear expansion coefficient, poor creep resistance, poor wear resistance, low hardness, and difficult molding and secondary processing. [0003] To modify PTFE, the current methods mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08K7/00C08K3/34C08K3/36
CPCC08K3/34C08K3/346C08K3/36C08K7/00C08K2201/003C08L27/18
Inventor 林天锋
Owner NIPPON VALQUA IND LTD