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Method for preparing cross-linked polytetrafluoroethylene through electron beam irradiation

A technology of polytetrafluoroethylene and electron beam irradiation is applied in the field of preparing cross-linked polytetrafluoroethylene, which can solve the problems of lowering crystallinity, lowering melting point and keeping mechanical properties unchanged.

Inactive Publication Date: 2010-09-08
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if PTFE is cross-linked and a network structure is formed between the molecular chains, the mechanical properties remain basically unchanged; after cross-linking, the molecular chain segments of PTFE are difficult to arrange regularly, which is manifested by a decrease in crystallinity and a decrease in melting point.

Method used

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  • Method for preparing cross-linked polytetrafluoroethylene through electron beam irradiation
  • Method for preparing cross-linked polytetrafluoroethylene through electron beam irradiation
  • Method for preparing cross-linked polytetrafluoroethylene through electron beam irradiation

Examples

Experimental program
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Effect test

Embodiment 1

[0032] According to the above implementation procedure, the irradiated sample is a 1mm thick PTFE sheet, the electron beam energy is 1.6MeV, the inert gas is 1atm nitrogen, the dose rate is 333Gy / s, the radiation time is 7.5min, and the total radiation dose is 150kGy, radiation temperature 330~350℃, the properties of the obtained radiation cross-linked polytetrafluoroethylene and non-radiated polytetrafluoroethylene are listed in Table 1. Among them, the performance of the non-irradiated PTFE sheet is listed in Table 1 for comparison testing.

Embodiment 2

[0034] According to the above implementation procedure, the irradiated sample is a 1mm thick PTFE sheet, the electron beam energy is 1.6MeV, the inert gas is 1atm nitrogen, the dose rate is 333Gy / s, the radiation time is 7.5min, and the total radiation dose is 150kGy, the radiation temperature is room temperature, and the properties of the obtained radiation polytetrafluoroethylene are listed in Table 1.

Embodiment 3

[0036] According to the above implementation procedure, the irradiated sample is a 1mm thick PTFE sheet, the electron beam energy is 1.6MeV, the inert gas is 1atm nitrogen, the dose rate is 333Gy / s, the radiation time is 7.5min, and the total radiation dose is 150kGy, the radiation temperature is 330~350℃, and the properties of the radiation crosslinked polytetrafluoroethylene are listed in Table 1.

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Abstract

The invention relates to a method for preparing cross-linked polytetrafluoroethylene through electron beam irradiation, which comprises the following steps: 1. arranging a polytetrafluoroethylene sample in an irradiation container; 2. sealing the irradiation container, pumping until the pressure in the irradiation container is 0-1000Pa, and filling an inert gas until the pressure reaches the atmospheric pressure; 3. heating the irradiation container until the temperature in the container rises to 300-400 DEG C, and keeping the temperature constant; 4. arranging the irradiation container under electron beams, irradiating with the irradiation dose rate ranging from 1Gy / s to 1 multiplied by 105Gy / s, so that the irradiation dose reaches 10-3000kGy; and 5. stopping the irradiation, lowering the temperature, filling an inert gas into the irradiation container continuously to blow the sample to the room temperature, and then taking out the sample after being irradiated. The method can fundamentally maintain the mechanical properties of the prepared cross-linked polytetrafluoroethylene material, and has a broad application value in the production of polytetrafluoroethylene-based wear-resistant and radiation-resistant materials.

Description

Technical field [0001] The invention relates to a method for preparing cross-linked polytetrafluoroethylene (PTFE) by electron beam irradiation. Background technique [0002] Polytetrafluoroethylene (PTFE) has excellent properties and is known as the "Plastic King". It is widely used and is one of the important materials indispensable for modern industry. PTFE has shortcomings such as creep resistance, wear resistance, and poor radiation resistance, which limit its use under certain cutting-edge conditions. At the same time, improving these shortcomings is also one of the important directions of modified PTFE materials. The above shortcomings of PTFE can be attributed to its long-chain molecular structure. Research reports have shown that if the long-chain PTFE molecules are cross-linked, the above shortcomings can be effectively improved. Because PTFE has excellent chemical stability, it cannot be cross-linked chemically. At present, the radiation method is the only feasible m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/28C08J3/24C08L27/18
Inventor 王谋华吴国忠唐忠锋赵艳凝钟磊
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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