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Large-diameter thin-wall polytetrafluoroethylene pasty extrusion pipe and preparation method thereof

A polytetrafluoroethylene, large-diameter technology, applied in the field of materials, can solve the problems of insufficient thermal conductivity and wear resistance, and achieve the effects of strong toughness, increased sintering temperature, excellent hardness and self-lubricating properties

Active Publication Date: 2021-06-25
ZHEJIANG DEQING CONCEPTFE PLASTIC PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the PTFE paste extruded tubes currently on the market are used in waste heat recovery heat exchangers, and waste heat recovery heat exchangers have high requirements for the thermal conductivity and wear resistance of PTFE paste extruded tubes. The current PTFE Paste extruded tubes still have deficiencies in thermal conductivity and wear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this embodiment, a large-diameter thin-walled polytetrafluoroethylene paste extruded pipe comprises the following raw materials in terms of weight percentage: 1% of aluminum nitride micropowder (average particle diameter: 0.3 micron), potassium hexatitanate fiber (average length: 5 Micron, the average diameter is 0.1 micron) 1%, calcium oxide 0.1%, Mobil isopar G 20%, the balance is PTFE dispersion resin.

[0028] The preparation method of the large-diameter thin-walled polytetrafluoroethylene paste extruded tube comprises the following steps:

[0029] (1) According to the preset mass percentage, mix each raw material evenly, and after mixing, place it in an environment of 30° C. for more than 24 hours to obtain the mixed raw material;

[0030] (2) adding the mixed raw materials into a cylinder with an inner diameter of 198 mm, and preforming at 2 MPa for 40 min to obtain a cylindrical green body;

[0031] (3) Cylindrical green body is inserted in extruder, and the ...

Embodiment 2

[0034] In this embodiment, a large-diameter thin-walled polytetrafluoroethylene paste extruded pipe comprises the following raw materials in terms of weight percentage: 2% of aluminum nitride micropowder (average particle diameter: 0.3 micron), potassium hexatitanate fiber (average length: 5 Micron, the average diameter is 0.1 micron) 3%, calcium oxide 0.15%, Mobil isopar G 18%, and the balance is PTFE dispersion resin.

[0035] The preparation method of the large-diameter thin-walled polytetrafluoroethylene paste extruded tube comprises the following steps:

[0036] (1) According to the preset mass percentage, mix each raw material evenly, and after mixing, place it in an environment of 30° C. for more than 24 hours to obtain the mixed raw material;

[0037] (2) Add the mixed raw materials into a cylinder with an inner diameter of 198mm, preform for 30min at 1.5Mpa, and obtain a cylindrical green body;

[0038] (3) Cylindrical green body is inserted in extruder, and the diam...

Embodiment 3

[0041] In this embodiment, a large-diameter thin-walled polytetrafluoroethylene paste extruded tube comprises the following raw materials in terms of weight percentage: 3% of aluminum nitride micropowder (average particle diameter 0.3 micron), potassium hexatitanate fiber (average length of 5 Micron, the average diameter is 0.1 micron) 5%, calcium oxide 0.4%, Mobil isopar G 17.5%, the balance is PTFE dispersion resin.

[0042] The preparation method of the large-diameter thin-walled polytetrafluoroethylene paste extruded tube comprises the following steps:

[0043](1) According to the preset mass percentage, mix each raw material evenly, and after mixing, place it in an environment of 30° C. for more than 24 hours to obtain the mixed raw material;

[0044] (2) Add the mixed raw materials into a cylinder with an inner diameter of 198mm, preform for 30min at 1.5Mpa, and obtain a cylindrical green body;

[0045] (3) Cylindrical green body is inserted in extruder, and the diamete...

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Abstract

The invention discloses a large-diameter thin-wall polytetrafluoroethylene pasty extrusion pipe and a preparation method thereof, and the large-diameter thin-wall polytetrafluoroethylene pasty extrusion pipe comprises the following raw materials in percentage by weight: 1-3% of aluminum nitride micro powder, 1-5% of potassium hexatitanate fiber, 10-20% of solvent and the balance of PTFE dispersion resin. The aluminum nitride micro powder has high thermal conductivity, after the aluminum nitride micro powder is added, the polytetrafluoroethylene pasty extrusion pipe has excellent thermal conductivity, and the thermal conductivity can reach 2.7 W / m / K. The potassium hexatitanate fiber is high in strength, strong in toughness and light in weight, after the potassium hexatitanate fiber is added as a filler, the polytetrafluoroethylene pasty extrusion pipe has excellent hardness and self-lubricating performance, the shore hardness can reach 94, the static friction coefficient can be as low as 0.04, and the polytetrafluoroethylene pasty extrusion pipe has good wear resistance. At the working temperature (1000 DEG C or below) of a waste heat recovery heat exchanger, the heat conductivity of the potassium hexatitanate fiber is not obviously reduced, and the heat conduction performance of the polytetrafluoroethylene paste extrusion pipe is not influenced.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a large-diameter thin-wall polytetrafluoroethylene paste extruded pipe and a preparation method thereof. Background technique [0002] Among all plastics, polytetrafluoroethylene (PTFE) is currently one of the materials with the best electrical insulation, chemical stability, and corrosion resistance. Due to the extremely narrow phase transition range and loose elasticity of PTFE, it is difficult to extrude or injection mold PTFE like ordinary thermoplastics. At present, it is the main production method of polytetrafluoroethylene products to make PTFE dispersed resin fine powder by emulsion polymerization, and then add appropriate organic solvent to make paste mixture for extrusion molding. [0003] For example, the Chinese invention patent application with the publication number CN107263884A discloses a preparation method for paste extrusion of super-large-diamete...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08K7/08C08K3/28C08K3/22B29C48/09B29C67/04
CPCC08K7/08C08K3/28C08K3/22B29C48/001B29C48/09B29C67/04C08K2003/282C08L2203/18C08K2003/2206C08L27/18Y02P20/10Y02P70/10
Inventor 熊行
Owner ZHEJIANG DEQING CONCEPTFE PLASTIC PROD