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A kind of fluorine-containing corrosion-resistant material and preparation method thereof

A technology of corrosion-resistant materials and raw materials, applied in the field of polymer chemistry, can solve problems such as waste of materials, potential safety hazards, impact on service life, etc., achieve excellent mechanical properties and chemical corrosion resistance, facilitate popularization and application, and reduce production costs.

Active Publication Date: 2022-07-08
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Under the corrosion of fluorine gas, the service life of the above-mentioned sealing devices including PTFE is no more than three days, so that it is very easy to cause leakage or even combustion of fluorine gas, forming a serious safety hazard and causing a great waste of materials
[0004] CN 102153828A mentions a composite material that uses inorganic fluorine-containing compounds to fill PTFE. Compared with pure PTFE, this filling can improve the service life of the material in a fluorine gas environment, but due to the fusion of inorganic fluoride and PTFE Not good, it will increase the brittleness of the material, affect the mechanical properties of the product, and finally affect the service life. The longest can only reach about 5 months, so there is still room for further improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a fluorine-containing corrosion-resistant material, which is prepared by the following method:

[0032] First, calcium fluoride was pretreated at 390 °C for 3 hours, and then calcium fluoride, PFA and PTFE with particle sizes of 45 μm, 40 μm and 50 μm were mixed in a weight ratio of 8:1:11 in a high-speed mixer. Mix for 5 minutes, mix well, then add the mixture into the metal mold, pressurize at room temperature, the pressure is 70MPa, and the pressure is maintained for 4 minutes to obtain a preformed product, and then the preformed product is heated to 120 ° C, kept for 3 hours, and then heated to 370°C, and kept at this temperature for 3 hours, and then cooled for 8 hours to obtain a product of the required specification and size, and the tensile strength of the obtained material was 10.9 MPa after testing.

Embodiment 2

[0034] This embodiment provides a fluorine-containing corrosion-resistant material, which is different from Embodiment 1 in that the particle sizes of calcium fluoride, PFA and PTFE are 35 μm, 30 μm and 25 μm respectively, and the tensile strength of the obtained material is 11.5 MPa.

Embodiment 3

[0036] This embodiment provides a fluorine-containing corrosion-resistant material, which is different from Embodiment 1 in that the particle sizes of calcium fluoride, PFA and PTFE are 50 μm, 37 μm and 16 μm respectively, and the tensile strength of the obtained material is 10.7 MPa.

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Abstract

The invention relates to the field of polymer chemistry, in particular to a fluorine-containing corrosion-resistant material and a preparation method thereof. The raw materials of the fluorine-containing corrosion-resistant material include polytetrafluoroethylene resin (PTFE) and a composite modifier, and the composite modifier includes an inorganic fluorine-containing compound. Based on the total weight of the raw materials, the composite modifier The agent also includes 5-20 wt % of fusible polytetrafluoroethylene (PFA). The fluorine-containing material provided by the invention has excellent mechanical properties and chemical corrosion resistance, and the processed products have low porosity and good density. Not only can it be resistant to strong acids and alkalis, but also can be used for a long time in the presence of strong oxidants such as fluorine gas, and it is not easy to be corroded. At the same time, the cost of the material is low, the preparation method is simple, and the popularization and application are convenient.

Description

technical field [0001] The invention relates to the field of polymer chemistry, in particular to a fluorine-containing corrosion-resistant material and a preparation method thereof. Background technique [0002] At present, the domestic materials used for anti-corrosion and leakage mainly include: (1) rare metals titanium, zirconium, tantalum; (2) PTFE resin; (3) furan resin; (4) acid-resistant phenolic resin, etc. The corrosion resistance of these materials is excellent, and they are all resistant to corrosion by strong acids, strong oxidants, reducing agents, strong alkalis and various organic solvents, but they are all corroded by fluorine gas. [0003] Under the corrosion of fluorine gas, the service life of the above-mentioned sealing devices including PTFE is not more than three days at most, and it is very easy to cause leakage or even combustion of fluorine gas, which will cause serious safety hazards and cause great waste of materials. [0004] CN 102153828A mentio...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08K3/16
Inventor 周云峰姚权卫苏小龙张春静
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD