PTFE mediakazhinji inoreva nhepfenyuro yakagadzirwa nepolytetrafluoroethylene (PTFE kwenguva pfupi). Izvi zvinotevera sumo yakadzama yePTFE media:
Ⅰ. Material properties
1.Chemical kugadzikana
PTFE chinhu chakasimba kwazvo. Iyo ine yakasimba makemikari kuramba uye inert kune anenge ese makemikari. Semuenzaniso, munharaunda yeasidhi yakasimba (yakadai se sulfuric acid, nitric acid, etc.), mabhesi akasimba (akadai sodium hydroxide, nezvimwewo) uye akawanda organic solvents (akadai sebenzene, toluene, nezvimwewo), PTFE zvinhu hazvizoiti makemikari. Izvi zvinoita kuti ive yakakurumbira zvikuru mumashandisirwo akadai sezvisimbiso uye pombi linings mumakemikari nemishonga yemishonga, nokuti maindasitiri aya anowanzoda kutarisana nemhando dzakasiyana dzemakemikari akaoma.
2.Temperature resistance
PTFE midhiya inogona kuchengetedza kuita kwayo pane yakakura tembiricha renji. Inogona kushanda zvakajairwa mutembiricha ye -200 ℃ kusvika 260 ℃. Pakutonhora kwakadzika, hazvizove brittle; pakupisa kwepamusoro, haizoora kana kukanganisa zviri nyore semamwe mapurasitiki akajairwa. Uku kupikisa tembiricha yakanaka kunoita kuti PTFE midhiya ive yakakosha mashandisiro mumhepo, zvemagetsi nezvimwe. Semuenzaniso, mu hydraulic system yendege, PTFE midhiya inogona kumira tembiricha yakakwira inogadzirwa neambient tembiricha shanduko uye mashandiro ehurongwa panguva yekubhururuka.
3.Low friction coefficient
PTFE ine yakanyanya kuderera friction coefficient, imwe yepasi pakati pezvinozivikanwa zvakasimba zvinhu. Ayo ane simba uye static friction coefficients ese ari madiki kwazvo, angangoita 0.04. Izvi zvinoita kuti PTFE dielectric inyatsoshanda kana ichishandiswa semafuta muzvikamu zvemakanika. Semuyenzaniso, mune mamwe machina ekutapurirana midziyo, mabhengi kana mabhushi akagadzirwa nePTFE anogona kuderedza kukweshera pakati pemakina zvikamu, kuderedza kushandiswa kwesimba, uye kuwedzera hupenyu hwebasa remidziyo.
4.Electrical insulation
PTFE ine yakanaka magetsi ekudzivirira zvivakwa. Iyo inochengetedza yakakwirira insulation kuramba pamusoro pehupamhi frequency renji. Mumidziyo yemagetsi, PTFE dielectric inogona kushandiswa kugadzira insulating zvinhu, senge insulation layer yewaya netambo. Inogona kudzivirira kudonha kwazvino, kuve nechokwadi chekushanda kwakajairwa kwemidziyo yemagetsi, uye kuramba kukanganiswa kwekunze kwemagetsi.
Semuenzaniso, mumatambo ekukurumidzira ekutaurirana, iyo PTFE insulation layer inogona kuve yakagadzikana uye nekurongeka kwekufambiswa kwechiratidzo.
5.Kusanamatira
Iyo yepamusoro yePTFE dielectric ine yakasimba isina-stickiness. Izvi zvinodaro nekuti iyo electronegativity yemaatomu efluorine muPTFE molecular structure yakakwira zvakanyanya, zvichiita kuti zviome kuti PTFE surface ibatane nemakemikari nezvimwe zvinhu. Kusanamatira uku kunoita kuti PTFE ishandiswe zvakanyanya mumachira emidziyo yekubikira (yakadai semapani asina tsvimbo). Kana chikafu chikabikwa mune pani isiri-tsvimbo, hazvizobatike nyore kumadziro epani, zvichiita kuti zvive nyore kuchenesa uye kuderedza huwandu hwemafuta anoshandiswa panguva yekubika.
Ndeupi musiyano uripo pakati pePVDF nePTFE?
PVDF (polyvinylidene fluoride) uye PTFE (polytetrafluoroethylene) ese ari mapolima ane fluorinated ane akawanda akafanana zvimiro, asi zvakare ane mimwe misiyano yakakosha muchimiro chemakemikari, kuita uye mashandisirwo. Izvi zvinotevera misiyano yavo mikuru:
Ⅰ. Chimiro chemakemikari
PVDF:
Chimiro chemakemikari ndeye CH2−CF2n, iri semi-crystalline polymer.
Iyo molecular chain ine alternating methylene (-CH2-) uye trifluoromethyl (-CF2-) zvikamu.
PTFE:
Chimiro chemakemikari iCF2−CF2n, iri perfluoropolymer.
Iyo molecular chain inoumbwa zvachose nemaatomu efluorine uye kabhoni maatomu, asina maatomu ehydrogen.
Ⅱ. Kuenzanisa kwekuita
| Performance Index | PVDF | PTFE |
| Chemical resistance | Yakanaka makemikari kuramba, asi kwete yakanaka sePTFE. Kuramba kwakanaka kune akawanda acids, mabhesi uye organic zvinonyungudutsa, asi kushomeka kuramba kune mabhesi akasimba pakupisa kwakanyanya. | Inert kune angangoita ese makemikari, zvakanyanya kupikisa makemikari. |
| Tembiricha kuramba | Iyo tembiricha yekushandisa ndeye -40 ℃～150 ℃, uye kuita kunodzikira pakupisa kwakanyanya. | Iyo tembiricha yekushandisa ndeye -200 ℃～260 ℃, uye tembiricha yekudzivirira yakanakisa. |
| Mechanical simba | Iyo mechanical simba yakakwira, ine yakanaka tensile simba uye kukanganisa kupikisa. | Iyo mechanical simba ishoma, asi ine yakanaka kuchinjika uye kuneta kuramba. |
| Friction coefficient | Iko friction coefficient yakaderera, asi yakakwirira kupfuura PTFE. | Iko friction coefficient yakaderera zvakanyanya, imwe yepasi pakati pezvinozivikanwa zvakasimba zvinhu. |
| Kuiswa kwemagetsi | Iko kushanda kwemagetsi ekudzivirira kwakanaka, asi kwete kwakanaka sePTFE. | Iko kushanda kwemagetsi ekudzivirira kwakanakisa, kwakakodzera kune yakakwirira frequency uye yakakwirira voltage nharaunda. |
| Kusanamatira | Iko kusanamatira kwakanaka, asi hakuna kunaka sePTFE. | Iyo ine yakanyanya kusimba isinganamate uye ndicho chinhu chikuru chekusina-tsvimbo pani coatings. |
| Processability | Zviri nyore kugadzirisa uye zvinogona kuumbwa nenzira dzakajairwa senge jekiseni molding uye extrusion. | Izvo zvakaoma kugadzirisa uye zvinowanzoda nzira dzakakosha dzekugadzirisa dzakadai se sintering. |
| Density | Density inosvika 1.75 g/cm³, iyo iri kureruka. | Density inenge 2.15 g/cm³, iyo inorema. |
Ⅲ. Nzvimbo dzekushandisa
| Applications | PVDF | PTFE |
| Indasitiri yemakemikari | Inoshandiswa kugadzira pombi dzisingaite ngura, mavharuvhu, pombi nemimwe midziyo, kunyanya yakakodzera kubata nzvimbo dzine acidic kana alkaline. | Inoshandiswa zvakanyanya mu linings, zvisimbiso, mapaipi, nezvimwewo zvemakemikari emidziyo, yakakodzera kune yakanyanyisa makemikari mamiriro. |
| Electronic industry | Inoshandiswa kugadzira dzimba, insulation layers, nezvimwe zvemagetsi ezvikamu, akakodzera yepakati frequency uye voltage nharaunda. | Inoshandiswa kugadzira insulating zvikamu zve-high-frequency cables uye zvemagetsi zvinongedzo, zvakakodzera kune yakakwirira frequency uye yakakwirira voltage nharaunda. |
| Mechanical industry | Inoshandiswa kugadzira mekiniki zvikamu, mabhengi, zvisimbiso, nezvimwewo, yakakodzera kune yepakati mutoro uye tembiricha nharaunda. | Inoshandiswa kugadzira yakaderera-kukwesha zvikamu, zvisimbiso, nezvimwewo, zvakakodzerwa nepamusoro tembiricha uye yakaderera friction nharaunda. |
| Indasitiri yezvekudya nemishonga | Inoshandiswa kugadzira zvikamu zvemidziyo yekugadzira chikafu, linings emidziyo yemishonga, nezvimwewo, yakakodzera kune yepakati tembiricha uye makemikari nharaunda. | Inoshandiswa kugadzira isina-tsvimbo pani coatings, mabhandi ekutakura chikafu, marashi emidziyo yemishonga, nezvimwewo, akakodzera kupisa kwakanyanya uye nharaunda yakasimba yemakemikari. |
| Indasitiri yekuvaka | Inoshandiswa kugadzira zvivakwa zvekunze zvemadziro ekunze, zvekufurira zvinhu, nezvimwe, zvine kunaka kwemamiriro ekunze kuramba uye aesthetics. | Inoshandiswa kugadzira zvivharo zvekuisa chisimbiso, zvinhu zvisingapindi mvura, nezvimwe, zvakakodzera kune zvakanyanya nharaunda. |
Ⅳ. Mutengo
PVDF: Mutengo wakaderera, unokwanisika.
PTFE: Nekuda kwehunyanzvi hwekugadzira tekinoroji uye kuita kwakanakisa, mutengo wakakwira.
Ⅴ. Environmental impact
PVDF: Huwandu hushoma hwemagasi anokuvadza hunogona kuburitswa pakupisa kwakanyanya, asi kukonzeresa kwezvakatipoteredza kudiki.
PTFE: Zvinhu zvinokuvadza zvakaita se perfluorooctanoic acid (PFOA) zvinogona kuburitswa pakupisa kwakanyanya, asi maitiro emazuva ano ekugadzira akadzikisa zvakanyanya njodzi iyi.
Nguva yekutumira: Chivabvu-09-2025