High-heat-resistant modified polytetrafluoroethylene material for pump valves

The technology of polytetrafluoroethylene and polytetrafluoroethylene powder is applied in the field of high heat-resistant modified polytetrafluoroethylene materials for pumps and valves, which can solve the problems of poor dimensional stability, large coefficient of linear expansion, small coefficient of friction, etc. The effect of improved wear resistance and high temperature resistance, good social promotion and application, and improved mechanical properties

Inactive Publication Date: 2019-08-06
吴军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] PTFE material has excellent performance characteristics such as small friction coefficient, non-absorbent, flame retardant, and corrosion resistance. It is mainly used in various devices such as diaphragms, seals, and sealing friction pairs in pump valves. However, in actual applications , PTFE has the disadvantages of large linear expansion coefficient, poor dimensional stability, poor thermal conductivity and heat resistance, easy cold flow, and difficult to form, which make it defective during use and seriously affect the performance of pumps and valves. Therefore, it is necessary to Modify PTFE to improve its performance and shortcomings, expand the scope of use, prolong the service life, and ensure the normal operation of pumps and valves. Therefore, a high heat-resistant modified PTFE material for pumps and valves is invented. It is necessary to solve the above problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A high heat-resistant modified polytetrafluoroethylene material for pump valves, comprising the following components (by mass percentage): 20% polytetrafluoroethylene powder, 15% clay, 12% dolomite powder, 8% attapulgite, graphite 6% olefin, 5% high temperature resistant adhesive, 4% high temperature resistant coating, 4% high temperature resistant fiber, and auxiliary additives are the balance.

[0018] Further, both clay and attapulgite are calcined at 700°C for 7 hours in a calciner, then taken out and cooled for 2 hours, pulverized by a pulverizer, then put into 25-35% weak alkali aqueous solution, soaked for 80 Minutes, followed by drying in a hot water dryer for 6 hours, and finally ball milling for 40 minutes to obtain powder.

[0019] Further, the particle size of the dolomite powder is 400 mesh.

[0020] Further, the high-temperature-resistant adhesive is a milky white or transparent viscous liquid, and 5% ionized water, 2% inorganic photocatalytic nano-titani...

Embodiment 2

[0025] A high heat-resistant modified polytetrafluoroethylene material for pump valves, comprising the following components (by mass percentage): 22% polytetrafluoroethylene powder, 16% clay, 13% dolomite powder, 9% attapulgite, graphite 7% alkene, 6% high temperature resistant adhesive, 6% high temperature resistant coating, 5% high temperature resistant fiber, and the balance of auxiliary additives.

[0026] Further, both the clay and the attapulgite were calcined at 720°C for 8 hours in a calciner, then taken out and cooled for 3 hours, pulverized by a pulverizer, then put into a 30% weak alkali aqueous solution, soaked for 100 minutes, Then, it was dried in a hot water drier for 7 hours, and finally ball milled for 60 minutes to obtain powder.

[0027] Further, the particle size of the dolomite powder is 600 mesh.

[0028] Further, the high temperature resistant adhesive is a milky white or transparent viscous liquid, and 10% ionized water, 3% inorganic photocatalytic nan...

Embodiment 3

[0032] Embodiment 3: A high heat-resistant modified polytetrafluoroethylene material for pump valves, including the following components (by mass percentage): 24% polytetrafluoroethylene powder, 18% clay, 14% dolomite powder, attapulgite 10%, graphene 8%, high temperature resistant adhesive 7%, high temperature resistant coating 7%, high temperature resistant fiber 6%, auxiliary additives are the balance.

[0033] Further, both the clay and the attapulgite are calcined at 750°C for 9 hours in a calciner, then taken out and cooled for 4 hours, pulverized by a pulverizer, then put into a 35% weak alkali aqueous solution, soaked for 120 minutes, Then, it was dried in a hot water drier for 8 hours, and finally ball milled for 80 minutes to obtain powder.

[0034] Further, the particle size of the dolomite powder is 800 mesh.

[0035] Further, the high temperature resistant adhesive is a milky white or transparent viscous liquid, and 12% ionized water, 5% inorganic photocatalytic ...

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Abstract

The invention discloses a high-heat-resistant modified polytetrafluoroethylene material for pump valves, wherein the components comprise, by mass, 20-24%of polytetrafluoroethylene powder, 15-18%of clay, 12-14%of dolomite powder, 8-10%of attapulgite, 6-8%of graphene, 5-7%of a high-temperature-resistant adhesive, 4-7%of a high-temperature-resistant coating material, 4-6%of high-temperature-resistantfiber, and the balance of an auxiliary additive. According to the present invention, the polytetrafluoroethylene is used as the raw material, the clay, the dolomite powder, the attapulgite and the graphene are used as the auxiliary materials, and the high-temperature-resistant adhesive, the high-temperature-resistant coating material and the high-temperature-resistant fiber are cooperatively added, such that the modified polytetrafluoroethylene material has advantages of greatly-improved heat resistance, improved mechanical property, improved hardness, improved corrosion resistance, improvedwear resistance and improved high-temperature resistance; and the device used for pumps and valves and prepared by using the modified polytetrafluoroethylene material has characteristics of long service life, safety, reliability and good social promotion and application.

Description

technical field [0001] The invention relates to the technical field related to polytetrafluoroethylene, in particular to a high heat-resistant modified polytetrafluoroethylene material for pump valves. Background technique [0002] PTFE material has excellent performance characteristics such as small friction coefficient, non-absorbent, flame retardant, and corrosion resistance. It is mainly used in various devices such as diaphragms, seals, and sealing friction pairs in pump valves. However, in actual applications , PTFE has shortcomings such as large linear expansion coefficient, poor dimensional stability, poor thermal conductivity and heat resistance, easy cold flow, and difficult to form, which make it defective during use and seriously affect the performance of pumps and valves. Therefore, it is necessary to To modify PTFE, improve its performance and shortcomings, expand the scope of use, prolong the service life, and ensure the normal operation of pumps and valves. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L23/06C08L27/06C08L23/12C08L83/04C08K3/34C08K3/04C08K3/22C08K3/30
CPCC08K2003/2241C08K2003/3009C08K2201/011C08K2201/014C08L27/18C08L2201/08C08L2205/035C08L2205/16C08L23/06C08L27/06C08L23/12C08L83/04C08K3/346C08K3/34C08K3/04C08K3/22C08K3/30
Inventor 吴军
Owner 吴军
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