CN102643113B - Production method of polytetrafluoroethylene impregnated graphite heat exchange block - Google Patents
Production method of polytetrafluoroethylene impregnated graphite heat exchange block Download PDFInfo
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- CN102643113B CN102643113B CN201210111232.5A CN201210111232A CN102643113B CN 102643113 B CN102643113 B CN 102643113B CN 201210111232 A CN201210111232 A CN 201210111232A CN 102643113 B CN102643113 B CN 102643113B
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- graphite heat
- heat exchange
- exchange block
- block
- production method
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- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 122
- 239000010439 graphite Substances 0.000 title claims abstract description 122
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- -1 polytetrafluoroethylene Polymers 0.000 title abstract description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 title abstract 4
- 239000004810 polytetrafluoroethylene Substances 0.000 title abstract 4
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000004140 cleaning Methods 0.000 claims abstract description 14
- 238000004381 surface treatment Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 25
- 239000006185 dispersion Substances 0.000 claims description 20
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 16
- 238000010792 warming Methods 0.000 claims description 12
- 239000013543 active substance Substances 0.000 claims description 11
- 238000007598 dipping method Methods 0.000 claims description 11
- NXGRFXYFVBQEHE-UHFFFAOYSA-N 2,6-dimethyl-3-tetradecylpyridine Chemical compound C(CCCCCCCCCCCCC)C=1C(=NC(=CC=1)C)C NXGRFXYFVBQEHE-UHFFFAOYSA-N 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 6
- 125000000217 alkyl group Chemical group 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- 238000002203 pretreatment Methods 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- MYWUZJCMWCOHBA-VIFPVBQESA-N methamphetamine Chemical compound CN[C@@H](C)CC1=CC=CC=C1 MYWUZJCMWCOHBA-VIFPVBQESA-N 0.000 claims description 5
- NQNOMXXYKHWVKR-UHFFFAOYSA-N methylazanium;sulfate Chemical compound NC.NC.OS(O)(=O)=O NQNOMXXYKHWVKR-UHFFFAOYSA-N 0.000 claims description 5
- 241000282326 Felis catus Species 0.000 claims description 4
- 241000270295 Serpentes Species 0.000 claims description 4
- 230000002378 acidificating effect Effects 0.000 claims description 4
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 4
- 239000004094 surface-active agent Substances 0.000 claims description 4
- AJXBTRZGLDTSST-UHFFFAOYSA-N amino 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)ON AJXBTRZGLDTSST-UHFFFAOYSA-N 0.000 claims description 2
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 claims description 2
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 2
- 238000000643 oven drying Methods 0.000 claims 1
- 238000001035 drying Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 5
- 238000005470 impregnation Methods 0.000 abstract 3
- 238000003825 pressing Methods 0.000 abstract 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229920003987 resole Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
Abstract
The invention discloses a production method of a polytetrafluoroethylene impregnated graphite heat exchange block, belonging to the technical field of chemical equipment manufacturing. The method is mainly characterized by comprising the following steps of: first performing cleaning, drying, impregnation and high-temperature plasticization of the graphite heat exchange block; performing surface treatment, impregnation and pressing; plasticizing under high pressure, and repeating the operation of the second step to finish the processing; and performing long-time pressing check under the pressure of 4-5 kg, wherein the product without leakage is qualified. According to the method disclosed by the invention, the graphite heat exchange block is subjected to multiple times of impregnation with polytetrafluoroethylene so that the polytetrafluoroethylene can be effectively fused with the graphite heat exchange block.
Description
Technical field
The present invention relates to a kind of modified producing method of graphite heat exchange block, belong to field of chemical equipment, be specifically related to a kind of production method of polytetrafluoroethylimpregnated impregnated graphite heat transfer block.
Background technology
Dipping polytetrafluoro graphite heat exchanger is the many equipment of chemical industry, environment protection industry application, and its feature is can the very strong solvent of designed to contain corrosive, and the dissolving that solvability is strong, oxidizing substance, alkaline matter, uses heatproof to reach 300 DEG C.
In prior art, to dipping method mainly twice tetrafluoroethylene dipping and a resin impregnating of the graphite heat exchange block in graphite heat exchanger, because the chemical stability of resol can not show a candle to tetrafluoroethylene, therefore with this explained hereafter product out, corrosion-resistant, heat resistance is bad, using can seepage after for some time.
Summary of the invention
The object of the invention is to make up the deficiencies in the prior art, provide a kind of three plasticizings to produce the production method of dipping tetrafluoroethylene graphite heat exchange block, heatproof, the resistance to chemical corrosion of the graphite heat exchange block utilizing this production method to produce are better.
A production method for polytetrafluoroethylimpregnated impregnated graphite heat transfer block, comprises the steps:
A, graphite heat exchange block pre-treatment, clean graphite heat exchange block, put into baker, regulates baker
Temperature is warming up to 200 ~ 300 DEG C in 3 ~ 4h, dries 1 ~ 2h;
The first time plasticizing of B, graphite heat exchange block, after graphite heat exchange block temperature is down to normal temperature, puts it in dipping still, keeps the spacing having 3 ~ 5mm between graphite heat exchange block, be evacuated to 1 × 10
-3~ 2 × 10
-3pa, suck polytetrafluoroethyldispersion dispersion, exceed after graphite heat exchange block 5 ~ 10mm until tetrafluoroethylene liquid level, eliminate vacuum, dispersion liquid is released after 0.5 ~ 1.5h, take out graphite heat exchange block, treat that liquid stream is clean, graphite heat exchange block is put into baker, 100 ~ 200 DEG C are warming up in 1 ~ 3h, keep 4 ~ 5h, then put into high temperature sintering furnace, take out after 340 ~ 360 DEG C of plasticizing 4 ~ 5h;
The secondary plasticizing of C, graphite heat exchange block, carries out surface treatment by the graphite heat exchange block tensio-active agent plastified in step B, then carries out secondary plasticizing according to the method described in step B to graphite heat exchange block, and the time is 3 ~ 5h;
The third time plasticizing of D, graphite heat exchange block, carries out third time plasticizing according to the method described in step C to graphite heat exchange block.
In the present invention, carrying out surface-treated method to graphite heat exchange block in described step C is: graphite heat exchange block is placed in supersonic cleaning machine, inject efficient surfactant, supersound process 1 ~ 2h, take out graphite heat exchange block, change tensio-active agent, again graphite heat exchange block is placed in supersonic cleaning machine, takes out after supersound process 0.5 ~ 1h, use deionized water drip washing, the tensio-active agent that removing is residual, then dries.Because ultrasonic cleaning utilizes ultrasonic wave cavatition in a liquid, acceleration effect and direct flow effect to liquid and dirt direct, indirectly act on, crud layer is disperseed, emulsification, peel off and reach cleaning object, wherein, cavatition is exactly that ultrasonic wave carries out transmission in the high frequency conversion mode of the force of compression of more than 20,000 times per second and decompression power interactivity to liquid, in the decompression masterpiece used time, the phenomenon of vacuum nuclear colony bubble is produced in liquid, when compression force, vacuum nuclear colony bubble is stressed when crushing and produces powerful surging force, peel off the dirt on cleaned material surface thus, thus reach accurate clean object, and in the present invention, utilize the surface treatment that the hyperacoustic cavatition of ultrasonic wave is carried out graphite heat exchange block exactly.
In the present invention, described polytetrafluoroethyldispersion dispersion is the aqueous liquid dispersion of mass concentration 45-55%, and the median size of tetrafluoroethylene particulate is wherein 0.1 ~ 0.5 μm.
In the present invention, described tensio-active agent is cats product.
In the present invention, the mass concentration of described aqueous dispersion of polytetrafluoroethyland preferably 50% because disperse dense higher than 55% time, dispersion liquid is unstable, easily condenses; Dispersion liquid concentration lower than 45% time, then too much moisture, to dipping unfavorable.
In the present invention, described cats product is one or more in tetradecyl-lutidine brometo de amonio, dialkylethanolamines METH sulfate methyl ammonium, tri alkyl ammomium chloride, snake oil acidic group quaternary ammonium salt, aliphatic amine polyoxyethylene ether ammonio methacrylate.
The invention has the beneficial effects as follows, graphite heat exchange block tetrafluoroethylene is repeatedly flooded, tetrafluoroethylene can more effectively be merged with graphite heat exchange block mutually.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but protection scope of the present invention is not only confined to embodiment.
Embodiment 1
A, graphite heat exchange block pre-treatment, clean graphite heat exchange block, put into baker, and what regulate baker is warming up to 200 DEG C in 3h, starts to dry, and keeps drying 1h;
The first time plasticizing of B, graphite heat exchange block, after graphite heat exchange block temperature is down to normal temperature, puts it in dipping still, keeps the spacing having 3mm between graphite heat exchange block, be evacuated to 1 × 10
-3pa, sucking massfraction is the aqueous dispersion of polytetrafluoroethyland of 50%, and the median size of tetrafluoroethylene particulate is wherein 0.1 ~ 0.5 μm, exceed after graphite heat exchange block 5mm until tetrafluoroethylene liquid level, eliminate vacuum, after 0.5h, release aqueous dispersion of polytetrafluoroethyland, take out graphite heat exchange block, treat that liquid stream is clean, graphite heat exchange block is put into baker, in 1h, is warming up to 100 DEG C, keep 4h, then put into high temperature sintering furnace, take out after 340 DEG C of plasticizing 5h;
C, graphite heat exchange block secondary plasticizing, the graphite heat exchange block tensio-active agent tetradecyl-lutidine brometo de amonio plastified in step B is carried out surface treatment, exactly graphite heat exchange block is placed in supersonic cleaning machine, inject tetradecyl-lutidine brometo de amonio, supersound process 1h, take out graphite heat exchange block, change tetradecyl-lutidine brometo de amonio, again graphite heat exchange block is placed in sound cleaning machine, take out after supersound process 0.5h, use deionized water drip washing, tetradecyl-lutidine brometo de amonio that removing is residual, then dry, then according to step B, graphite heat exchange block is plastified, time is 3h,
The third time plasticizing of D, graphite heat exchange block, carries out third time plasticizing according to step C to graphite heat exchange block.
Embodiment 2
A, graphite heat exchange block pre-treatment, clean graphite heat exchange block, put into baker, and what regulate baker is warming up to 400 DEG C in 4h, starts to dry, and keeps drying 2h;
B, graphite heat exchange block flood, and after graphite heat exchange block temperature is down to normal temperature, put it in dipping still, keep the spacing having 5mm between graphite heat exchange block, be evacuated to 2 × 10
-3pa, sucking massfraction is the polytetrafluoroethyldispersion dispersion of 45%, and the median size of tetrafluoroethylene particulate is wherein 0.1 ~ 0.5 μm, exceed after graphite heat exchange block 10mm until tetrafluoroethylene liquid level, eliminate vacuum, after 1.5h, release dispersion liquid, take out graphite heat exchange block, treat that liquid stream is clean, graphite heat exchange block is put into baker, in 3h, is warming up to 150 DEG C, keep 5h, then put into high temperature sintering furnace, take out after 350 DEG C of plasticizing 4.5h;
C, graphite heat exchange block secondary plasticizing, the graphite heat exchange block tensio-active agent plastified in step B is carried out surface treatment, the graphite heat exchange block efficient surfactant dialkylethanolamines METH sulfate methyl ammonium plastified in step B is carried out surface treatment, exactly graphite heat exchange block is placed in supersonic cleaning machine, inject tetradecyl-lutidine brometo de amonio, supersound process 2h, take out graphite heat exchange block, change dialkylethanolamines METH sulfate methyl ammonium, again graphite heat exchange block is placed in sound cleaning machine, take out after supersound process 0.5h, use deionized water drip washing, the dialkylethanolamines METH sulfate methyl ammonium that removing is residual, then dry, continue to plastify graphite heat exchange block according to step B, time is 5h,
The third time plasticizing of D, graphite heat exchange block, carries out third time plasticizing according to step C to graphite heat exchange block.
Embodiment 3
A, graphite heat exchange block pre-treatment, clean graphite heat exchange block, put into baker, and what regulate baker is warming up to 250 DEG C in 3h, starts to dry, and keeps drying 2h;
B, graphite heat exchange block flood, and after graphite heat exchange block temperature is down to normal temperature, put it in dipping still, keep the spacing having 4mm between graphite heat exchange block, be evacuated to 2 × 10
-3pa, sucking mass concentration is the aqueous dispersion of polytetrafluoroethyland of 50%, and the median size of tetrafluoroethylene particulate is wherein 0.1 ~ 0.5 μm, exceed after graphite heat exchange block 8mm until tetrafluoroethylene liquid level, eliminate vacuum, after 1h, release dispersion liquid, take out graphite heat exchange block, treat that liquid stream is clean, graphite heat exchange block is put into baker, in 2.5h, is warming up to 150 DEG C, keep 5h, then put into high temperature sintering furnace, take out after 360 DEG C of plasticizing 4h;
C, graphite heat exchange block secondary plasticizing, the graphite heat exchange block tensio-active agent plastified in step B is carried out surface treatment, exactly graphite heat exchange block is placed in supersonic cleaning machine, inject tri alkyl ammomium chloride, supersound process 1.5h, take out graphite heat exchange block, change tri alkyl ammomium chloride, again graphite heat exchange block is placed in sound cleaning machine, takes out after supersound process 0.5h, use deionized water drip washing, the tri alkyl ammomium chloride that removing is residual, then dry, then plastify graphite heat exchange block according to step B, the time is 5h;
The third time plasticizing of D, graphite heat exchange block, carries out third time plasticizing according to step C to graphite heat exchange block.
Embodiment 4
A, graphite heat exchange block pre-treatment, clean graphite heat exchange block, put into baker, and what regulate baker is warming up to 300 DEG C in 3.5h, starts to dry, and keeps drying 1h;
B, graphite heat exchange block flood, and after graphite heat exchange block temperature is down to normal temperature, put it in dipping still, keep the spacing having 5mm between graphite heat exchange block, be evacuated to 1 × 10
-3pa, sucking mass concentration is 55% aqueous dispersion of polytetrafluoroethyland, and the median size of tetrafluoroethylene particulate is 0.1 ~ 0.5 μm, exceed after graphite heat exchange block 8mm until tetrafluoroethylene liquid level, eliminate vacuum, after 1.5h, release dispersion liquid, take out graphite heat exchange block, treat that liquid stream is clean, graphite heat exchange block is put into baker, in 1h, is warming up to 200 DEG C, keep 5h, then put into high temperature sintering furnace, take out after 360 DEG C of plasticizing 4h;
C, graphite heat exchange block secondary plasticizing, the graphite heat exchange block tensio-active agent plastified in step B is carried out surface treatment, exactly graphite heat exchange block is placed in supersonic cleaning machine, inject snake oil acidic group quaternary ammonium salt, supersound process 1.5h, take out graphite heat exchange block, change tri alkyl ammomium chloride, again graphite heat exchange block is placed in sound cleaning machine, takes out after supersound process 0.5h, use deionized water drip washing, the snake oil acidic group quaternary ammonium salt that removing is residual, then dry, then plastify graphite heat exchange block according to step B, the time is 4h;
The third time plasticizing of D, graphite heat exchange block, carries out third time plasticizing according to step C to graphite heat exchange block.
Last it is noted that above embodiment only in order to illustrate the present invention and and unrestricted technical scheme described in the invention; Therefore, although this specification sheets with reference to each above-mentioned embodiment to present invention has been detailed description, those of ordinary skill in the art should be appreciated that and still can modify to the present invention or equivalent to replace; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, it all should be encompassed in right of the present invention.
Claims (6)
1. a production method for polytetrafluoroethylimpregnated impregnated graphite heat transfer block, is characterized in that, comprises the steps:
A, graphite heat exchange block pre-treatment, clean graphite heat exchange block, put into baker, regulates oven drying temperature in 3 ~ 4h, be warming up to 200 ~ 400 DEG C, dry 1 ~ 2h;
B, the first time plasticizing of graphite heat exchange block, after graphite heat exchange block temperature is down to normal temperature, put it in dipping still, keep the spacing having 3 ~ 5mm between graphite heat exchange block, be evacuated to 1 × 10-3 ~ 2 × 10-3pa, suck polytetrafluoroethyldispersion dispersion, exceed after graphite heat exchange block 5 ~ 10mm until tetrafluoroethylene liquid level, eliminate vacuum, dispersion liquid is released after 0.5 ~ 1.5h, take out graphite heat exchange block, treat that liquid stream is clean, graphite heat exchange block is put into baker, 100 ~ 200 DEG C are warming up in 1 ~ 3h, keep 4 ~ 5h, then high temperature sintering furnace is put into, take out after 340 ~ 360 DEG C of plasticizing 4 ~ 5h,
The secondary plasticizing of C, graphite heat exchange block, carries out surface treatment by the graphite heat exchange block tensio-active agent plastified in step B, then carries out secondary plasticizing according to the method described in step B to graphite heat exchange block, and the time is 3 ~ 5h;
The third time plasticizing of D, graphite heat exchange block, carries out third time plasticizing according to the method described in step C to graphite heat exchange block.
2. the production method of polytetrafluoroethylimpregnated impregnated graphite heat transfer block according to claim 1, it is characterized in that, carrying out surface-treated method to graphite heat exchange block in described step C is: graphite heat exchange block is placed in supersonic cleaning machine, inject efficient surfactant, supersound process 1 ~ 2h, take out graphite heat exchange block, change tensio-active agent, again graphite heat exchange block is placed in sound cleaning machine, take out after supersound process 0.5 ~ 1h, use deionized water drip washing, the efficient surfactant that removing is residual, then dry.
3. the production method of polytetrafluoroethylimpregnated impregnated graphite heat transfer block according to claim 1, it is characterized in that, described polytetrafluoroethyldispersion dispersion is the aqueous liquid dispersion of mass concentration 45-55%, and the median size of tetrafluoroethylene particulate is wherein 0.1 ~ 0.5 μm.
4. the production method of polytetrafluoroethylimpregnated impregnated graphite heat transfer block according to claim 1 and 2, is characterized in that, described tensio-active agent is cats product.
5. the production method of polytetrafluoroethylimpregnated impregnated graphite heat transfer block according to claim 3, is characterized in that, the mass concentration of described aqueous dispersion of polytetrafluoroethyland is 50%.
6. the production method of polytetrafluoroethylimpregnated impregnated graphite heat transfer block according to claim 4, it is characterized in that, described cats product is one or more in tetradecyl-lutidine brometo de amonio, dialkylethanolamines METH sulfate methyl ammonium, tri alkyl ammomium chloride, snake oil acidic group quaternary ammonium salt, aliphatic amine polyoxyethylene ether ammonio methacrylate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210111232.5A CN102643113B (en) | 2012-04-16 | 2012-04-16 | Production method of polytetrafluoroethylene impregnated graphite heat exchange block |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210111232.5A CN102643113B (en) | 2012-04-16 | 2012-04-16 | Production method of polytetrafluoroethylene impregnated graphite heat exchange block |
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| CN102643113A CN102643113A (en) | 2012-08-22 |
| CN102643113B true CN102643113B (en) | 2014-12-31 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103319202B (en) * | 2013-05-22 | 2015-01-07 | 宁波银海机械制造有限公司 | Graphite heat exchange block used for highly corrosion-resistant medium, and preparation method thereof |
| CN104788122A (en) * | 2015-04-09 | 2015-07-22 | 南通晨光石墨设备有限公司 | Impregnation technology of PTFE (polytetrafluoroethylene) resin |
| CN106517176A (en) * | 2016-11-04 | 2017-03-22 | 南通贝思特石墨设备有限公司 | Preparation method of polytetrafluoroethylene impregnated graphite material |
| CN109877023A (en) * | 2019-02-26 | 2019-06-14 | 常州福升新材料科技有限公司 | A kind of production technology of fluoroplastics graphite heat exchanger |
| CN110407205A (en) * | 2019-07-11 | 2019-11-05 | 上海应用技术大学 | A kind of method that compound impregnating agent promotes impregnated graphite performance |
| CN113880605B (en) * | 2021-11-16 | 2023-03-31 | 贵州兰鑫石墨机电设备制造有限公司 | Method for modifying polytetrafluoroethylene impregnated graphite by dynamic isostatic pressing method |
| CN114736040B (en) * | 2022-03-08 | 2023-01-03 | 青岛渤化石墨设备有限公司 | Processing technology of high-efficiency heat exchange graphite heat exchanger |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2474533Y (en) * | 2001-02-08 | 2002-01-30 | 冯圣君 | Polytetrafluoroethylene graphite part |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2474533Y (en) * | 2001-02-08 | 2002-01-30 | 冯圣君 | Polytetrafluoroethylene graphite part |
Non-Patent Citations (1)
| Title |
|---|
| 聚四氟乙烯浸渍剂在石墨设备中的应用;吴建飞;《全面腐蚀控制》;20050831;第19卷(第4期);第35-36、41页 * |
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Effective date of registration: 20191122 Address after: 226000 group 3, Maqiao village, Jiuhua Town, Rugao City, Nantong City, Jiangsu Province Patentee after: Jiangsu Suyu Chemical Equipment Co.,Ltd. Address before: Maqiao town Rugao City Jiuhua village 226541 Jiangsu city of Nantong province twenty-two Group No. 31 Patentee before: NANTONG SUYU CHEMICAL EQUIPMENT MANUFACTURING Co.,Ltd. |
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