The crystallization melting point of PTFE ke 327 ℃, empa resin e ke ke ea ba boemong ba ho qhibiliha ho fihlela e ka holimo ho 380 ℃, 'me viscosity ea ho qhibiliha e holimo ho 1 010 Pa*S.Ho feta moo, PTFE e na le khanyetso e matla ea solvent.Ka hona, ha e khone ho qhibiliha mokhoa oa ho sebetsa, o ke ke oa qhibiliha mokhoa oa ho sebetsa, hangata tlhahiso ea lihlahisoa tsa eona e ka tšoana le ts'ebetso ea tšepe le ceramic - sampole, compaction ea pele ea phofo, joale sintering le mechanical processing, kapa ka extrusion molding, isotactic pressing. ho bopa, ho roala ho bopa le ho etsa calendering le mekhoa e meng ea ho sebetsa.
The crystallization melting point of PTFE ke 327 ℃, empa resin e ke ke ea ba boemong ba ho qhibiliha ho fihlela e ka holimo ho 380 ℃, 'me viscosity ea ho qhibiliha e holimo ho 1 010 Pa*S.Ho feta moo, PTFE e na le khanyetso e matla ea solvent.Ka hona, ha e khone ho qhibiliha mokhoa oa ho sebetsa, o ke ke oa qhibiliha mokhoa oa ho sebetsa, hangata tlhahiso ea lihlahisoa tsa eona e ka tšoana le ts'ebetso ea tšepe le ceramic - sampole, compaction ea pele ea phofo, joale sintering le mechanical processing, kapa ka extrusion molding, isotactic pressing. ho bopa, ho roala ho bopa le ho etsa calendering le mekhoa e meng ea ho sebetsa.
1. Ho bopa
Ho bopa hona joale ke mokhoa o sebelisoang ka ho fetisisa oa ho bōpa bakeng sa PTFE.Theknoloji ea ho bopake thepa e itseng ea ho bōpa (phofo, granule, fibrous material, joalo-joalo) ka har'a hlobo ea tšepe, ka - - mocheso o tsitsitseng, khatello - - mokhoa oa ho etsa.Li-polymers tse bōpiloeng ha li felle ka boima ba tsona ba limolek'hule, 'me hoo e ka bang li-plastiki tsohle li ka bōptjoa.Likarolo tse kholo tsa ho bopa ke;Theko e tlaase, lisebelisoa tse bonolo, lichelete tse tlaase, tse sa lekanyetsoang ke boima ba limolek'hule tsa polasetiki e entsoeng;Mefokolo ke katleho e tlase ea tlhahiso, matla a phahameng a basebetsi le boleng bo sa tsitsang ba sehlahisoa.PTFE e boima bo phahameng ba limolek'hule 'me metsi a fokola haholo.Ha mekhoa e meng ea ts'ebetso e sa butsoa, lihlahisoa tsa PTFE li sebelisoa haholo ke ho bopeha lefatšeng ka bophara.
Ho bōptjoa ho ka aroloa ka mekhoa e mehlano ho ea ka phapang ea mokhoa o itseng: (1) ho hatella - ho hatisa mokhoa oa ho hatisa (o tsejoang hape e le mokhoa oa mahala oa sintering); (2) sintering - mokhoa oa ho hatella;(3) ho futhumatsa ka potlako ho hatella. mokhoa;(5) mokhoa oa ho tobetsa ka nako e le ngoe le ho sintering.
2. Mokhoa oa Hydroform
Mokhoa oa khatello ea Hydraulic, o tsejoang hape e le mokhoa oa ho lekana, mokhoa oa khatello ea isobaric kapa mokhoa oa ho bopa rabara, ke ho eketsa resin ea PTFE ka ho lekana pakeng tsa mokotla le lebota la hlobo, ebe ho ea mokotleng ho kena mokelikeli (metsi a sebelisoang hangata), khatello ea mokotla oa rabara ho atolosoa ha lebota la hlobo, ho kopanya resin le ho fetoha sehlahisoa se entsoeng esale pele - mokhoa.Mokhoa ona o ka sebelisoa ho etsa sleeve ea boholo bo boholo, tanka ea polokelo e ka tlaase, khetla ea hemispheric, tora ea tora, letlapa le leholo, joalo-joalo, hammoho le lihlahisoa tse rarahaneng tse nang le sebopeho sa motsoako oa PTFE, tse kang tee, setsoe le profile.Melemo e ka sehloohong ea ho bopa ha hydraulic ke sebopeho se bonolo sa lisebelisoa le hlobo - pompo e tloaelehileng ea metsi e nkela mochine oa khatiso oa lithane tse phahameng, 'me lihlahisoa li hatelloa ka mokhoa o ts'oanang le o teteaneng - o fella ka ho etsoa ha likarolo tse kholo, libopeho tse rarahaneng le mokhoa o bonolo oa lesela. .
3. Sututsa ho bopa
Khatello ea Push e boetse e tsejoa e le "paste extrusion molding", 20-30 mesh sieve ea disperse resin le organic additives (toluene, petroleum ether, solvent oil, ratio ea resin boima ba 1/5) e kopantsoeng le pente, prepress ho cylindrical cylindrical blank. , ebe o kenya ka har'a moqomo oa mochini o hatellang, o futhumatsang ka mochini oa plunker push.Ka mor'a ho omisa le ho sila ka mocheso oa 360 ~ 380 ° C, lihlahisoa tse matla le tse thata tsa li-tube le li-bar li fumanoa ka mor'a ho pholile.Lihlahisoa tsa ho sututsa le ho hatella li lekanyelitsoe ho molamu o nang le bophara ba 16mm kapa ka tlase le phaephe e nang le botenya ba 3mm kapa ka tlase.
4. Spiral extrusion molding
The screw extruder ea PTFE phofo e fapane le extruder e sebelisoang ke li-plastiki tse ling tsa thermoplastic.Ho bōptjoa ha extrusion ea polasetiki e tloaelehileng ea thermoplastic ke ho sutumelletsa thepa pele ka thuso ea ho potoloha ha screw, 'me khabareng ho hatella, ho kuta le ho kopanya thepa.Thepa e boetse e qhibilihisoa ke mocheso o hlahisoang ke matla a ho kuta le ho futhumatsa ka ntle ho silinda ea thepa.Leha ho le joalo, screw ea PTFE extruder e phetha karolo feela ea ho fetisa le ho sutumetsa, e le hore thepa e fetele hloohong ea sekoti se le seng se nang le khoele e nang le lihlooho tse peli le sekontiri se tšoanang le botebo, ebe se kena ka har'a hlobo ea molomo bakeng sa. sintering and cooling, le mefuta e nang le kgatello e fanoang ke sesebediswa sa kgatello ya kgatello ho fihlela sepheo se tswellang.Hangata ho thata ho sebetsana le PTFE ka screw extruder e le 'ngoe.Motsoako o fokolang oa ho ferekana oa phofo ea PTFE o baka skidding nakong ea ho fepa, e leng ho fokotsang haholo matla a ho fetisa a screw.'Me ka lebaka la mocheso oa khohlano, e ka boela ea etsa hore phofo e khomarele screw kapa barrel, ho etsa hore ho fepa ho be thata le ho se tsitse.
Lilemong tsa morao tjena, li-twin-screw li boetse li sebelisoa ho sebetsa thepa ea mofuta ona o khethehileng.Molao-motheo oa eona oa ho fepa o fapane le oa extruder e le 'ngoe,' me o na le ts'ebetso e ntle ea lipalangoang, e ka hlōlang bothata ba ho thella ha phofo ea UHMWPE ka screw le ho ntlafatsa haholo matla a ho fepa a screw.The counter-rotating twin-screw extruder e na le motsoako o betere le phello ea homogenization ho feta mokhoa o ts'oanang oa tataiso ea mafahla-screw extruder, empa ka lebaka la matla a eona a maholo a karohano, ketso ea ho kuta ka lekhalo la screw e kholoanyane, e etsang hore thepa e futhumale haholo. , 'me boima ba molek'hule ba extruder bo ka theoha ka hoo e ka bang 40%.Haeba lekhalo le le leholo mme sekoti se sa kopane, thepa e tla khomarela tšepe e chesang.Leha ho le joalo, tšebeliso ea ho potoloha e tšoanang ea mafahla screw extruder, ha ho na bothata bo joalo.Lintho tse bonahalang ka extruder ka ho kuta ketso tse nyenyane tse, plasticizing palo e hlokahalang ea mocheso, tsohle ho tloha mohloding le mocheso, 'me kahoo e ka ba taolo e nepahetseng, e leng se ka etsa hore lintho tse bonahalang tshebetsong extrusion ho fokotsa ho senyeha ha mocheso, ka nako e tšoanang ka. e le ho boloka phallo ea thepa e tloaelehileng le e tsitsitseng ka nko, boholo ba karolo ea nko ea moralo e lokela ho lumellana le molumo oa lisebelisoa tse tsamaisang screw.Lebelo la Screw ha le potlake, hangata hoo e ka bang makhetlo a 10 ka motsotso.E le hore u qobe boitsebiso bo khomarelang ka tšohanyetso holim'a tšepe, mocheso oa extrusion o tlameha ho laoloa ka thata.
5. Plunger extrusion molding
Plunger extrusion processing polasetiki, ho sebetsa ka polasetiki ke mokhoa o batlang o le oa khale, ho tloha ha thepa ena e hlaha, batho ba ile ba qala ho sebelisa mokhoa ona ho sebetsa polasetiki.PTFE e sebetswa ka plunger extruder ka ho tobetsa quantitative resin ka har'a hlobo e kenang, ho etsa hore plunger e boele e boele e be sehlahisoa se entsoeng esale pele.Kahoo ho ea pele le ho ea pele, ka har'a hlobo ea molomo ho theha lihlahisoa tse ngata tsa ho bopa.Ka lebaka la khohlano pakeng tsa PTFE resin le khohlano pakeng tsa PTFE resin le hlobo lerako, le bophahamo ba modumo katoloso ya preformed sehlahiswa nakong sintering ka hlobo, sehlahiswa preformed e sintered le cooled ka e tsoelang pele kaofela tlas'a khatello.Melemo ea mokhoa ona ke e latelang: ha ho na ho kuta ha ho etsoa mokhoa oa ho bōpa, boima ba molek'hule bo fokolang bo fokotseha, boleng ba sehlahisoa bo botle, 'me ha bo felle ka boima ba molek'hule.Leha ho le joalo, ka lebaka la sebaka se senyenyane sa ho kopana pakeng tsa lisebelisoa tse tala le likarolo tse futhumatsang ts'ebetsong ea extrusion, ts'ebetso ea ho futhumatsa e tlaase, e fokotsang lebelo la extrusion.
6. Mekhoa e meng ea ho sebetsa;
PTFE e ka boela ea sebetsoa ka ho bōptjoa ka ente, ho bōptjoa ha calendering, ho bopa ka ho roala kapa ho bōptjoa ha bobeli.
Nako ea poso: Jul-31-2018