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Method for improving strength and wear resistance of polytetrafluoroethylene

A technology of polytetrafluoroethylene and strength, applied in the field of plastics, can solve the problems of limiting the practical application of polytetrafluoroethylene materials, poor wear resistance of polytetrafluoroethylene, low mechanical strength, etc., and achieve high strength and wear resistance, production Safe, low-cost results

Inactive Publication Date: 2015-08-05
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]However, PTFE has poor wear resistance, low mechanical strength, easy cold flow, and strong viscoelastic deformation under external force
This largely limits the practical application of PTFE materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) The method is as follows:

[0014] 1) Mix 1000-325 purpose Na 2 O-modified corundum superfine powder is mixed with polytetrafluoroethylene plastic powder according to the mass fraction of 10.5-50.0%, and mechanically stirred to make the mixed powder mix evenly;

[0015] 2) Put the uniformly mixed powder raw materials into the mold, hold the pressure for 1-5 minutes under the pressure of 30-70MPa, and then keep it in the sintering furnace for 50-70 minutes at 350-400°C to sinter and shape.

[0016] (2) Test results

[0017] The tensile strength is tested according to GB1040-79, and the Brinell hardness is tested according to HG168-65. The results are shown in Table 1.

[0018] Table 1 Add Na 2 Effect of O-modified corundum powder on the tensile strength and Brinell hardness of polytetrafluoroethylene

[0019] Na 2 Amount of O-modified corundum powder (wt.%) Tensile strength (MPa) Brinell hardness (kg / mm 2 ) 0 27.34 HB4.56 10.5 46.89 H...

Embodiment 2

[0021] (1) The method is as follows:

[0022] 1) Set 1000-325 purpose K 2 O-modified corundum superfine powder is mixed with polytetrafluoroethylene plastic powder according to the mass fraction of 10.5-50.0%, and mechanically stirred to make the mixed powder mix evenly;

[0023] 2) Put the uniformly mixed powder raw materials into the mold, hold the pressure for 1-5 minutes under the pressure of 30-70MPa, and then keep it in the sintering furnace for 50-70 minutes at 350-400°C to sinter and shape.

[0024] (2) Test results

[0025] The tensile strength is tested according to GB1040-79, and the Brinell hardness is tested according to HG168-65. The results are shown in Table 2.

[0026] Table 2 Add K 2 Effect of O-modified corundum powder on the tensile strength and Brinell hardness of polytetrafluoroethylene

[0027] K 2 Amount of O-modified corundum powder (wt.%) Tensile strength (MPa) Brinell hardness (kg / mm 2 ) 0 27.34 HB4.56 10.5 46.07 HB5....

Embodiment 3

[0029] (1) The method is as follows:

[0030] 1) Mix 1000-325 purpose Na 2 O-modified corundum superfine powder is mixed with polytetrafluoroethylene plastic powder according to the mass fraction of 10.5-50.0%, and mechanically stirred to make the mixed powder mix evenly;

[0031] 2) Put the uniformly mixed powder raw materials into the mold, hold the pressure for 1-5 minutes under the pressure of 30-70MPa, and then keep it in the sintering furnace for 50-70 minutes at 350-400°C to sinter and shape.

[0032] (2) Test results

[0033] The tensile strength is tested according to GB1040-79, and the Brinell hardness is tested according to HG168-65. The results are shown in Table 3.

[0034] Table 3 Add Li 2 Effect of O-modified corundum powder on the tensile strength and Brinell hardness of polytetrafluoroethylene

[0035] Li 2 Amount of O-modified corundum powder (wt.%) Tensile strength (MPa) Brinell hardness (kg / mm 2 ) 0 27.34 HB4.56 10.5 45.36 H...

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Abstract

The invention relates to a method for improving strength and hardness of polytetrafluoroethylene. According to the method, modified corundum submicron powder with a particle size of 1000 to 325 meshes is added as a reinforcing agent and a wear-resisting agent for polytetrafluoroethylene in the preparation process of polytetrafluoroethylene; the modified corundum submicron powder is corundum submicron powder modified by K2O, Na2O, Li2O and / or a mixture of K2O, Na2O and Li2O; and the addition amount of the modified corundum submicron powder with a particle size of 1000 to 325 meshes is 10.5 to 50.0% of the total weight of raw materials. Since the corundum submicron powder modified by K2O, Na2O, Li2O and / or a mixture of K2O, Na2O and Li2O is added in the production process of polytetrafluoroethylene, strength and wear resistance of polytetrafluoroethylene are substantially improved; and the method provided by the invention has the advantages of production safety and low product cost, and polytetrafluoroethylene modified by the submicron powder has the advantages of high strength, hardness, etc.

Description

technical field [0001] The invention belongs to the field of plastics, and in particular relates to a method for improving the strength and wear resistance of polytetrafluoroethylene. Background technique [0002] Polytetrafluoroethylene is known as the "King of Plastics". It has many excellent properties such as colorless, non-toxic, wide temperature resistance range, chemical inertness and small friction coefficient. It is an important material that is indispensable in all industries centered on electronics, construction and other industries. [0003] According to the performance characteristics and processing characteristics of PTFE, its products are mainly used in the fields of anti-corrosion, anti-sticking, electrical and electronic, static and dynamic sealing, pharmaceutical packaging, etc. The types of products include plates, pipes, films, porous materials, glass Fiber impregnated cloth and filled modified products, etc. [0004] However, PTFE has poor wear resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K9/02C08K3/34B29C43/58B29C67/04B29C69/00
CPCB29C43/58B29C67/04B29C69/00C08K3/34C08K9/02C08L27/18
Inventor 曹大力
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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