CN112592551A - Heat-conducting polytetrafluoroethylene sealing gasket - Google Patents
Heat-conducting polytetrafluoroethylene sealing gasket Download PDFInfo
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- CN112592551A CN112592551A CN202011313916.4A CN202011313916A CN112592551A CN 112592551 A CN112592551 A CN 112592551A CN 202011313916 A CN202011313916 A CN 202011313916A CN 112592551 A CN112592551 A CN 112592551A
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- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 69
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 49
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 46
- 238000007789 sealing Methods 0.000 title claims abstract description 18
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 64
- 239000000843 powder Substances 0.000 claims abstract description 57
- 230000005251 gamma ray Effects 0.000 claims abstract description 13
- 229920001661 Chitosan Polymers 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 31
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 20
- 238000000498 ball milling Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 13
- 239000000839 emulsion Substances 0.000 claims description 13
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 10
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- 240000004808 Saccharomyces cerevisiae Species 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000004108 freeze drying Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 5
- 229940100890 silver compound Drugs 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 238000009210 therapy by ultrasound Methods 0.000 claims description 2
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 2
- 239000004809 Teflon Substances 0.000 claims 1
- 229920006362 Teflon® Polymers 0.000 claims 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000855 fermentation Methods 0.000 abstract description 5
- 230000004151 fermentation Effects 0.000 abstract description 5
- 238000002156 mixing Methods 0.000 abstract description 5
- 239000000758 substrate Substances 0.000 abstract description 5
- 238000005054 agglomeration Methods 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 abstract description 3
- 238000001179 sorption measurement Methods 0.000 abstract description 3
- 230000001737 promoting effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 5
- 238000010298 pulverizing process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 241000235342 Saccharomycetes Species 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229940125758 compound 15 Drugs 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/12—Adsorbed ingredients, e.g. ingredients on carriers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0806—Silver
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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Abstract
The invention discloses a heat-conducting polytetrafluoroethylene sealing gasket, which has the advantages of low volume resistivity, high heat conductivity coefficient and superior wear resistance. By Co60Irradiating Concha Ostreae powder with gamma ray to fully activate surface activity of Concha Ostreae powder, promoting its fermentation, mixing with chitosan and yeastAfter mixed fermentation, the internal structure of the oyster shell powder is changed, the adsorption performance is enhanced, the activity is enhanced, and the nano-silver is favorably attached to the surface of the oyster shell powder; the nano silver is attached to the surface of the oyster shell powder, so that the characteristics of easy agglomeration and difficult dispersion of the nano silver are improved, the compatibility of the oyster shell powder and a substrate is promoted, and the mechanical property of the obtained product is further improved.
Description
Technical Field
The invention belongs to the technical field of sealing materials, and particularly relates to a heat-conducting polytetrafluoroethylene sealing gasket.
Background
In the production process of petroleum, chemical and pharmaceutical industries, pipelines, valves, containers and other equipment are connected through channels, and a sealing gasket is generally placed at each flange connection part to play a role in sealing and preventing leakage. Because of its excellent high temperature resistance, aging resistance and chemical corrosion resistance, polytetrafluoroethylene materials are often used in the field of pipeline or chemical pump sealing. However, due to the fact that the pipeline conveys high-temperature media for a long time, due to poor heat conducting performance of polytetrafluoroethylene, the pipeline is overheated, and potential safety hazards are generated.
Disclosure of Invention
In view of the above problems, the present invention is directed to a heat conductive polytetrafluoroethylene sealing gasket.
The invention is realized by the following technical scheme:
a heat-conducting polytetrafluoroethylene sealing gasket comprises the following components in percentage by mass:
82-90% of polytetrafluoroethylene powder;
10-18% of oyster shell powder-nano silver-polytetrafluoroethylene compound;
the particle size of the polytetrafluoroethylene powder is 35-50 mu m.
Further, the preparation method comprises the following steps: evenly stirring the oyster shell powder-nano silver-polytetrafluoroethylene compound and the polytetrafluoroethylene powder at 20-50rpm, then placing the mixture at-20 to-25 ℃ for 30-40min, carrying out cold press molding at 30-35 MPa, keeping the pressure for 3-4min, then transferring the mixture into a roasting furnace, heating the mixture to 230 ℃ and 240 ℃ at the speed of 1-4 min/DEG C, roasting the mixture for 30-40min, then continuously heating the mixture to 280 ℃ and 300 ℃, roasting the mixture for 20-30min, heating the mixture to 350 ℃ and 360 ℃, roasting the mixture for 20-30min, and finally cooling the mixture to room temperature at the speed of 4-6 ℃/min.
Further, the preparation method of the oyster shell powder-nano silver-polytetrafluoroethylene compound comprises the following steps:
(1) drying 5-10 parts by weight of oyster shell powder at 100-120 deg.C for 30-40min, and using Co60Gamma-ray irradiation is carried out for 10-20s, then chitosan is added into the gamma-ray irradiation, the mixture is stirred uniformly, yeast is inoculated into the mixture, the mixture is fermented for 2-4 days under the conditions of 40-50 ℃ and 50-60% of humidity, the obtained fermented product is dried for 10-12h at the temperature of 70-80 ℃, then the fermented product is placed for 3-4h at the temperature of-30 to-35 ℃, and the fermented product is crushed to the particle size of 200-600nm, so as to obtain the pretreated oyster shell powder; by Co60The gamma ray irradiates the oyster shell powder, so that the surface activity of the oyster shell powder can be fully activated and promotedFermentation, after the oyster shell powder is mixed with chitosan and saccharomycetes for fermentation, the internal structure of the oyster shell powder is changed, the adsorption performance is enhanced, the activity is enhanced, and the attachment of nano-silver on the surface of the oyster shell powder is facilitated;
(2) adding the pretreated oyster shell powder obtained in the step (1) into a silver nitrate solution, performing ultrasonic dispersion for 20-30min at 35-40KHz, then dropwise adding an ammonia water solution into the solution, performing ultrasonic treatment for 20-30min after dropwise adding, standing for 2-3h, filtering, drying the obtained product at the temperature of 120-125 ℃ for 10-12h, and performing ball milling for 10-20min to obtain an oyster shell powder-nano silver compound; the nano silver is attached to the surface of the oyster shell powder, so that on one hand, the characteristics of easy agglomeration and difficult dispersion of the nano silver are improved, on the other hand, the nano silver promotes the compatibility of the oyster shell powder and a substrate, and the mechanical property of the obtained product is further improved;
(3) and (3) placing the nano silver-oyster shell powder obtained in the step (2) at the temperature of 200-210 ℃, roasting for 30-50min, then placing the mixture in a ball mill, adding 10-15 parts of ethanol and 4-6 parts of polytetrafluoroethylene emulsion, carrying out ball milling at the temperature of 70-80 ℃ until the solvent is completely volatilized, then freeze-drying the obtained product at the temperature of-30-40 ℃, and carrying out ball milling again until the particle size is 600nm, thus obtaining the oyster shell powder-nano silver-polytetrafluoroethylene composite. The polytetrafluoroethylene emulsion is used for modifying the oyster shell powder-nano silver, so that the dispersibility of the oyster shell powder-nano silver in a polytetrafluoroethylene substrate is obviously improved, the interface bonding force is improved, the mechanical property is enhanced, meanwhile, the formed oyster shell powder-nano silver-polytetrafluoroethylene can form a relatively perfect conductive network, the volume resistivity of the obtained material is reduced, and the heat conductivity of the material is enhanced.
Further, step (1) of said Co60The gamma ray radiation dose is 10-20 kGy.
Further, the mass fraction of the silver nitrate solution in the step (2) is 10-12%.
Further, the mass fraction of the ammonia water in the step (2) is 10-14%.
Further, the solid content of the polytetrafluoroethylene emulsion in the step (3) is 30-35%.
The invention has the beneficial effects that: the polytetrafluoroethylene sealing gasket prepared by the inventionThe sheet has low volume resistivity, high heat conductivity coefficient and excellent wear resistance. By Co60The gamma ray irradiates the oyster shell powder, so that the surface activity of the oyster shell powder can be fully activated, the fermentation of the oyster shell powder is promoted, and after the oyster shell powder is mixed with chitosan and saccharomycetes for fermentation, the internal structure of the oyster shell powder is changed, the adsorption performance is enhanced, the activity is enhanced, and the attachment of nano-silver on the surface of the oyster shell powder is facilitated; the nano silver is attached to the surface of the oyster shell powder, so that on one hand, the characteristics of easy agglomeration and difficult dispersion of the nano silver are improved, on the other hand, the nano silver promotes the compatibility of the oyster shell powder and a substrate, and the mechanical property of the obtained product is further improved; finally, the polytetrafluoroethylene emulsion is utilized to modify the oyster shell powder-nano silver, the dispersibility of the oyster shell powder-nano silver in a polytetrafluoroethylene substrate is obviously improved, the interface bonding force is improved, the mechanical property is enhanced, meanwhile, the formed oyster shell powder-nano silver-polytetrafluoroethylene can form a relatively perfect conductive network, the volume resistivity of the obtained material is reduced, and the heat conductivity of the material is enhanced.
Detailed Description
The invention is illustrated by the following specific examples, which are not intended to be limiting.
Example 1
A heat-conducting polytetrafluoroethylene sealing gasket comprises the following components in percentage by mass:
82% of polytetrafluoroethylene powder;
10% of oyster shell powder-nano silver-polytetrafluoroethylene compound;
the particle size of the polytetrafluoroethylene powder is 35 mu m.
Further, the preparation method comprises the following steps: evenly stirring the oyster shell powder-nano silver-polytetrafluoroethylene compound and polytetrafluoroethylene powder at 20rpm, then placing at-20 ℃ for 30min, carrying out cold press molding at 30 MPa, keeping for 3min, then transferring into a roasting furnace, heating to 230 ℃ at the speed of 1 min/DEG C, roasting for 30min, then continuing heating to 280 ℃, roasting for 20min, heating to 350 ℃, roasting for 20min, and finally cooling to room temperature at the speed of 4 ℃/min.
Further, the preparation method of the oyster shell powder-nano silver-polytetrafluoroethylene compound comprises the following steps:
(1) drying 5 parts by weight of oyster shell powder at 100 deg.C for 30min, and using Co60Irradiating with gamma ray for 10s, adding chitosan, stirring, inoculating yeast, mixing, fermenting at 40 deg.C and 50% humidity for 2 days, drying at 70 deg.C for 10 hr, standing at-30 deg.C for 3 hr, and pulverizing to particle size of 200nm to obtain pretreated Concha Ostreae powder; the Co60The gamma ray radiation dose is 10 kGy;
(2) adding the pretreated oyster shell powder obtained in the step (1) into a silver nitrate solution, ultrasonically dispersing for 20min at 35KHz, dripping an ammonia water solution into the solution, ultrasonically treating for 20min after dripping is finished, standing for 2h, filtering, drying the obtained product at 120 ℃ for 10h, and ball-milling for 10min to obtain an oyster shell powder-nano silver compound; the mass fraction of the silver nitrate solution is 10%, and the mass fraction of the ammonia water is 10%;
(3) placing the nano silver-oyster shell powder obtained in the step (2) at 200 ℃, roasting for 30min, then placing the mixture in a ball mill, adding 10 parts of ethanol and 4 parts of polytetrafluoroethylene emulsion, carrying out ball milling at 70 ℃ until the solvent is completely volatilized, then freeze-drying the obtained product at-30 ℃, and carrying out ball milling again until the particle size is 100nm to obtain an oyster shell powder-nano silver-polytetrafluoroethylene composite; the solid content of the polytetrafluoroethylene emulsion is 30%.
Example 2
A heat-conducting polytetrafluoroethylene sealing gasket comprises the following components in percentage by mass:
86% of polytetrafluoroethylene powder;
oyster shell powder-nano silver-polytetrafluoroethylene compound 15%;
the particle size of the polytetrafluoroethylene powder is 40 mu m.
Further, the preparation method comprises the following steps: evenly stirring the oyster shell powder-nano silver-polytetrafluoroethylene compound and polytetrafluoroethylene powder at 40rpm, then placing at-22 ℃ for 35min, carrying out cold press molding at 32 MPa, keeping for 4min, then transferring into a roasting furnace, heating to 235 ℃ at the speed of 2 min/DEG C, roasting for 35min, then continuing heating to 290 ℃, roasting for 25min, heating to 355 ℃, roasting for 25min, and finally cooling to room temperature at the speed of 5 ℃/min.
Further, the preparation method of the oyster shell powder-nano silver-polytetrafluoroethylene compound comprises the following steps:
(1) drying 8 parts by weight of oyster shell powder at 110 deg.C for 35min, and using Co60Irradiating with gamma ray for 15s, adding chitosan, stirring, inoculating yeast, mixing, fermenting at 45 deg.C and 55% humidity for 3 days, drying at 75 deg.C for 11 hr, standing at-32 deg.C for 4 hr, and pulverizing to particle size of 400nm to obtain pretreated Concha Ostreae powder; the Co60The gamma ray radiation dose is 15 kGy;
(2) adding the pretreated oyster shell powder obtained in the step (1) into a silver nitrate solution, ultrasonically dispersing for 25min at 38KHz, dripping an ammonia water solution into the solution, ultrasonically dispersing for 25min after dripping is finished, standing for 3h, filtering, drying the obtained product at 122 ℃ for 11h, and ball-milling for 15min to obtain an oyster shell powder-nano silver compound; the mass fraction of the silver nitrate solution is 11%, and the mass fraction of the ammonia water is 12%;
(3) placing the nano silver-oyster shell powder obtained in the step (2) at 205 ℃, roasting for 40min, then placing the mixture in a ball mill, adding 12 parts of ethanol and 5 parts of polytetrafluoroethylene emulsion, carrying out ball milling at 75 ℃ until the solvent is completely volatilized, then freeze-drying the obtained product at-35 ℃, and carrying out ball milling again until the particle size is 400nm to obtain an oyster shell powder-nano silver-polytetrafluoroethylene composite; the solid content of the polytetrafluoroethylene emulsion is 32%.
Example 3
A heat-conducting polytetrafluoroethylene sealing gasket comprises the following components in percentage by mass:
90% of polytetrafluoroethylene powder;
18% of oyster shell powder-nano silver-polytetrafluoroethylene compound;
the particle size of the polytetrafluoroethylene powder is 50 microns.
Further, the preparation method comprises the following steps: evenly stirring the oyster shell powder-nano silver-polytetrafluoroethylene compound and polytetrafluoroethylene powder at 50rpm, then placing the mixture at-25 ℃ for 40min, carrying out cold press molding at 35 MPa, keeping the temperature for 4min, then transferring the mixture into a roasting furnace, heating to 240 ℃ at the speed of 4 min/DEG C, roasting for 40min, then continuously heating to 300 ℃, roasting for 30min, heating to 360 ℃, roasting for 30min, and finally cooling to room temperature at the speed of 6 ℃/min.
Further, the preparation method of the oyster shell powder-nano silver-polytetrafluoroethylene compound comprises the following steps:
(1) drying 10 weight parts of oyster shell powder at 120 deg.C for 40min, and mixing with Co60Irradiating with gamma ray for 20s, adding chitosan, stirring, inoculating yeast, mixing, fermenting at 50 deg.C and humidity of 60% for 4 days, drying at 80 deg.C for 12 hr, standing at-35 deg.C for 4 hr, and pulverizing to particle size of 600nm to obtain pretreated Concha Ostreae powder; the Co60The radiation dose of the gamma ray is 20 kGy;
(2) adding the pretreated oyster shell powder obtained in the step (1) into a silver nitrate solution, ultrasonically dispersing for 30min at 40KHz, dripping an ammonia water solution into the solution, ultrasonically dispersing for 30min after dripping is finished, standing for 3h, filtering, drying the obtained product at 125 ℃ for 12h, and ball-milling for 20min to obtain an oyster shell powder-nano silver compound; the mass fraction of the silver nitrate solution is 12 percent, and the mass fraction of the ammonia water is 14 percent;
(3) placing the nano silver-oyster shell powder obtained in the step (2) at 210 ℃, roasting for 50min, then placing the mixture in a ball mill, adding 15 parts of ethanol and 6 parts of polytetrafluoroethylene emulsion, carrying out ball milling at 80 ℃ until the solvent is completely volatilized, then freeze-drying the obtained product at-40 ℃, and carrying out ball milling again until the particle size is 600nm to obtain an oyster shell powder-nano silver-polytetrafluoroethylene composite; the solid content of the polytetrafluoroethylene emulsion was 35%.
Comparative example 1
Compared with the embodiment 2, the method has the same steps except that the addition of the oyster shell powder-nano silver-polytetrafluoroethylene composite is omitted.
Comparative example 2
In this comparative example, the procedure was the same as in example 2 except that the addition of oyster shell powder was omitted.
Comparative example 3
Compared with example 2, the comparative example omits the addition of nano silver, and the method steps are the same except for this.
Comparative example 4
In this comparative example, the procedure was the same as in example 2 except that the addition of the polytetrafluoroethylene emulsion was omitted.
And (3) performance testing:
the volume resistivity is tested according to GB/T1410-;
the thermal conductivity is tested according to GB/T10297-;
the friction and wear performance is tested according to GB/T3960-1983, the load is 100N, and the rotating speed is 200 r/min.
The test results are shown in table 1:
TABLE 1
| Volume resistivity/. about.1013（Ω﹒cm） | Heat conductivity/[ W. mush. K ]-1] | Abrasion loss/mg | |
| Example 1 | 3.5 | 0.52 | 26.5 |
| Example 2 | 3.2 | 0.55 | 25.2 |
| Example 3 | 3.4 | 0.53 | 25.8 |
| Comparative example 1 | 8.4 | 0.21 | 105.2 |
| Comparative example 2 | 5.5 | 0.36 | 78.6 |
| Comparative example 3 | 8.2 | 0.25 | 82.5 |
| Comparative example 4 | 6.8 | 0.33 | 75.6 |
As can be seen from Table 1, the polytetrafluoroethylene sealing gasket prepared by the invention has the advantages of lower volume resistivity, higher heat conductivity coefficient and superior wear resistance.
Claims (7)
1. A heat-conducting polytetrafluoroethylene sealing gasket is characterized by comprising the following components in percentage by mass:
82-90% of polytetrafluoroethylene powder;
10-18% of oyster shell powder-nano silver-polytetrafluoroethylene compound;
the particle size of the polytetrafluoroethylene powder is 35-50 mu m.
2. A heat-conducting ptfe gasket seal according to claim 1, prepared by the process of: evenly stirring the oyster shell powder-nano silver-polytetrafluoroethylene compound and the polytetrafluoroethylene powder at 20-50rpm, then placing the mixture at-20 to-25 ℃ for 30-40min, carrying out cold press molding at 30-35 MPa, keeping the pressure for 3-4min, then transferring the mixture into a roasting furnace, heating the mixture to 230 ℃ and 240 ℃ at the speed of 1-4 min/DEG C, roasting the mixture for 30-40min, then continuously heating the mixture to 280 ℃ and 300 ℃, roasting the mixture for 20-30min, heating the mixture to 350 ℃ and 360 ℃, roasting the mixture for 20-30min, and finally cooling the mixture to room temperature at the speed of 4-6 ℃/min.
3. The heat-conducting polytetrafluoroethylene sealing gasket according to claim 1, wherein the preparation method of the oyster shell powder-nano silver-polytetrafluoroethylene composite comprises the following steps:
(1) drying 5-10 parts by weight of oyster shell powder at 100-120 deg.C for 30-40min, and using Co60Gamma-ray irradiation is carried out for 10-20s, then chitosan is added into the gamma-ray irradiation, the mixture is stirred uniformly, yeast is inoculated into the mixture, the mixture is fermented for 2-4 days under the conditions of 40-50 ℃ and 50-60% of humidity, the obtained fermented product is dried for 10-12h at the temperature of 70-80 ℃, then the fermented product is placed for 3-4h at the temperature of-30 to-35 ℃, and the fermented product is crushed to the particle size of 200-600nm, so as to obtain the pretreated oyster shell powder;
(2) adding the pretreated oyster shell powder obtained in the step (1) into a silver nitrate solution, performing ultrasonic dispersion for 20-30min at 35-40KHz, then dropwise adding an ammonia water solution into the solution, performing ultrasonic treatment for 20-30min after dropwise adding, standing for 2-3h, filtering, drying the obtained product at the temperature of 120-125 ℃ for 10-12h, and performing ball milling for 10-20min to obtain an oyster shell powder-nano silver compound;
(3) and (3) placing the nano silver-oyster shell powder obtained in the step (2) at the temperature of 200-210 ℃, roasting for 30-50min, then placing the mixture in a ball mill, adding 10-15 parts of ethanol and 4-6 parts of polytetrafluoroethylene emulsion, carrying out ball milling at the temperature of 70-80 ℃ until the solvent is completely volatilized, then freeze-drying the obtained product at the temperature of-30-40 ℃, and carrying out ball milling again until the particle size is 600nm, thus obtaining the oyster shell powder-nano silver-polytetrafluoroethylene composite.
4. A heat-conducting ptfe gasket seal according to claim 3, wherein step (1) said Co60The gamma ray radiation dose is 10-20 kGy.
5. A heat-conducting ptfe gasket seal according to claim 3, wherein the silver nitrate solution in step (2) is present in an amount of 10-12% by mass.
6. A heat-conducting teflon sealing gasket according to claim 3, wherein the mass fraction of ammonia water in step (2) is 10-14%.
7. A heat-conductive polytetrafluoroethylene sealing gasket according to claim 3, wherein said polytetrafluoroethylene emulsion of step (3) has a solids content of 30-35%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011313916.4A CN112592551A (en) | 2020-11-21 | 2020-11-21 | Heat-conducting polytetrafluoroethylene sealing gasket |
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