Iphoyinti lokuncibilika elicwebezelayo le-PTFE lingu-327℃, kodwa inhlaka ayikwazi ukuba sesimweni sokuncibilika ize ibe ngaphezu kuka-380℃, futhi i-viscosity encibilikayo iphezulu njengo-1 010 Pa*S.Ngaphezu kwalokho, i-PTFE inokumelana okuqinile kwe-solvent.Ngakho-ke, ayikwazi ukuncibilika indlela yokucubungula, ayikwazi ukuncibilika indlela yokucubungula, ngokuvamile ukukhiqizwa kwemikhiqizo yayo kungaba njengensimbi ne-ceramic processing - isampula, i-powder compaction yokuqala, bese i-sintering kanye ne-mechanical processing, noma ngokusebenzisa ukubunjwa kwe-extrusion, ukucindezela kwe-isotactic. ukubumba, ukuhlanganisa ukubumba kanye nokubumba i-calendering nezinye izindlela zokucubungula.
Iphoyinti lokuncibilika elicwebezelayo le-PTFE lingu-327℃, kodwa inhlaka ayikwazi ukuba sesimweni sokuncibilika ize ibe ngaphezu kuka-380℃, futhi i-viscosity encibilikayo iphezulu njengo-1 010 Pa*S.Ngaphezu kwalokho, i-PTFE inokumelana okuqinile kwe-solvent.Ngakho-ke, ayikwazi ukuncibilika indlela yokucubungula, ayikwazi ukuncibilika indlela yokucubungula, ngokuvamile ukukhiqizwa kwemikhiqizo yayo kungaba njengensimbi ne-ceramic processing - isampula, i-powder compaction yokuqala, bese i-sintering kanye ne-mechanical processing, noma ngokusebenzisa ukubunjwa kwe-extrusion, ukucindezela kwe-isotactic. ukubumba, ukuhlanganisa ukubumba kanye nokubumba i-calendering nezinye izindlela zokucubungula.
1. Ukubumba
Ukubumba okwamanje kuyindlela yokubumba esetshenziswa kakhulu ye-PTFE.Ubuchwepheshe bokubumbakuyinto ethile yokubumba (impuphu, i-granule, i-fibrous material, njll.) ibe isikhunta sensimbi, - - izinga lokushisa elilinganiselwe, ingcindezi - - indlela yokwenza.Ama-polymers abunjiwe awanqunyelwe isisindo sawo samangqamuzana, futhi cishe wonke amapulasitiki angabunjwa.Izici eziyinhloko zokubumba yilezi;Izindleko eziphansi, imishini elula, ukutshalwa kwezimali okuphansi, okunganqunyelwe isisindo samangqamuzana amapulasitiki acutshunguliwe;Okubi ukukhiqiza kahle okuphansi, izinga eliphezulu labasebenzi kanye nekhwalithi yomkhiqizo engazinzile.I-PTFE inesisindo samangqamuzana aphezulu kanye ne-fluidity embi kakhulu.Lapho ezinye izindlela zokucubungula zingavuthiwe, imikhiqizo ye-PTFE icutshungulwa ngokuyibumba emhlabeni wonke.
Ekubumbeni zingahlukaniswa zibe izindlela ezinhlanu ngokomehluko wenqubo ethile: (1) ukucindezela - ukucindezela indlela yokucindezela (eyaziwa nangokuthi indlela yokucindezela yamahhala); (2) indlela yokucindezela - yokucindezela; (3) ukushisa ngokushesha ukucindezela indlela;(5) indlela yokucindezela kanyekanye kanye ne-sintering.
2. Indlela ye-Hydroform
Indlela ye-Hydraulic pressure, eyaziwa nangokuthi indlela yokulinganisa, indlela yokucindezela kwe-isobaric noma indlela yokubumba irabha, ukwengeza i-PTFE resin ngokulinganayo phakathi kwesikhwama nodonga lwesikhunta, bese esikhwameni ku-liquid (amanzi asetshenziswa ngokuvamile), ingcindezi isikhwama senjoloba ekukhuliseni udonga lwesikhunta, ukuhlanganisa i-resin futhi ube umkhiqizo owenziwe ngaphambili - indlela.Le ndlela ingasetshenziselwa ukwakha umkhono wevolumu enkulu, ithangi lokugcina elingaphansi, igobolondo le-hemispheric, ikholomu yombhoshongo, i-slab enkulu, njll., kanye nemikhiqizo eyinkimbinkimbi enesakhiwo esiyinhlanganisela ye-PTFE, njenge-tee, indololwane kanye nephrofayili.Izinzuzo eziyinhloko zokubunjwa kwe-hydraulic yisakhiwo esilula semishini kanye nesikhunta - ipompo yamanzi evamile ithatha indawo yomshini we-high-tonnage press, futhi imikhiqizo icindezelwa ngokulinganayo futhi iminyene - okuholela ekwenziweni kwezingxenye ezinkulu, ukubunjwa okuyinkimbinkimbi kanye nesakhiwo esilula se-lining. .
3. Push ukubumba
I-Push pressure yaziwa nangokuthi i-paste extrusion molding, i-20-30 mesh sieve ye-disperse resin kanye nezithasiselo eziphilayo (i-toluene, i-petroleum ether, uwoyela we-solvent, isilinganiso sesisindo se-resin esingu-1/5) ixutshwe kunamathisele, cindezela kuqala odongeni olungenalutho olungenalutho. , bese ufaka emgqonyeni womshini wokucindezela, ngaphansi kokushisisa nge-plunker push molding.Ngemva kokumisa nokucwilisa ezingeni lokushisa elingu-360–380°C, ukusunduza okuqinile nokuqinile kanye neshubhu lokucindezela kanye nemikhiqizo yebha kutholakala ngemva kokupholisa.Imikhiqizo yokusunduza nokucindezela ikhawulelwe entweni enobubanzi obungu-16mm noma ngaphansi kanye nepayipi elinogqinsi oluwu-3mm noma ngaphansi.
4. Ukubunjwa kwe-spiral extrusion
I-screw extruder ye-PTFE powder ihlukile kune-extruder esetshenziswa amanye amapulasitiki ashisayo.Ukubunjwa kwe-extrusion kwamapulasitiki avamile we-thermoplastic ukusunduza impahla phambili ngosizo lokuzungezisa isikulufu, futhi okwamanje ukuminyanisa, ukugunda nokuxuba impahla.Impahla iphinde incibilikiswe ukushisa okukhiqizwa amandla e-shear kanye nokushisa kwangaphandle kwesilinda esibonakalayo.Kodwa-ke, isikulufu se-PTFE extruder sidlala kuphela indima yokudlulisa nokusunduza, ukuze impahla idlule ekhanda le-extruder ene-screw eyodwa enekhanda eliphindwe kabili kanye nephimbo nokujula okufanayo, bese ingena emlonyeni i-sintering kanye nokupholisa, futhi amafomu ngokucindezela okunikezwa idivayisi yokucindezela ukufeza injongo eqhubekayo.Kuvamise ukuba nzima ukucubungula i-PTFE nge-scruder eyodwa yesikulufu.I-coefficient ephansi ye-friction ye-PTFE powder ibangela ukushushuluza phakathi nenqubo yokudla, okunciphisa kakhulu umthamo wokudlulisa wesikulufu.Futhi ngenxa yokushisa kokungqubuzana, kungase futhi kwenze ukunamathela kwempushana kusikulufa noma emgqonyeni, okwenza ukudla kube nzima futhi kungazinzi.
Eminyakeni yamuva nje, i-twin-screw nayo isetshenziswe ekucubunguleni izinto zalolu hlobo olukhethekile.Umgomo wayo wokondla uhlukile kulowo we-extruder-screw extruder, futhi inomsebenzi wokuthutha omuhle, onganqoba inkinga yokuslayida ye-UHMWPE powder kusikulufu futhi ithuthukise kakhulu amandla okuphakela isikulufu.I-extruder ye-twin-screw extruder ezungezayo inomphumela ongcono wokuhlanganisa kanye no-homogenization kune-twin-screw extruder enesiqondiso esifanayo, kodwa ngenxa yamandla ayo amakhulu okuhlukanisa, isenzo sokugunda esikhaleni sesikulufu sikhulu, esibangela ukuthi okokusebenza kushise ngokweqile. , futhi isisindo samangqamuzana e-extruder singehla cishe ngo-40%.Uma igebe likhulu futhi isikulufu singabandakanyiwe, impahla izonamathela ensimbi eshisayo.Kodwa-ke, ukusetshenziswa kokujikeleza okufanayo kwe-twin screw extruder, ayikho inkinga enjalo.Okubalulekile ku-extruder ngesenzo sokugunda ezincane, ukwenza ipulasitiki inani elidingekayo lokushisa, konke kusuka emthonjeni wokushisa okuhlangene, futhi ngaleyo ndlela kungaba ukulawula okunembile, okungenza okubalulekile kunqubo yokukhishwa kunciphise ukuwohloka kokushisa, ngesikhathi esifanayo ukuze kugcinwe ukugeleza kwezinto ezivamile nezizinzile ekhaleni, usayizi wesigaba sekhala somklamo kufanele uhambisane nevolumu yento edlulisa isikulufu.Isivinini se-screw asisheshi, ngokuvamile cishe ama-revolution angu-10 ngomzuzu.Ukuze ugweme izinto ezinamathele ngokuzumayo endaweni yensimbi, izinga lokushisa le-extrusion kufanele lilawulwe ngokuqinile.
5. Ukubumba i-plunger extrusion
I-Plunger extrusion processing plastic, i-plastic processing iyindlela yasendulo, kusukela ekuveleni kwalokhu, abantu baqala ukusebenzisa le ndlela ukucubungula ipulasitiki.I-PTFE icutshungulwa nge-plunger extruder ngokucindezela i-resin yobuningi ibe isikhunta esingenisayo, okwenza i-plunger iphindaphinde futhi iyicindezele ibe umkhiqizo owakhiwe ngaphambilini.Ngakho emuva naphambili, emlonyeni isikhunta ukwakha multi - esiteji pre - imikhiqizo ukubumba.Ngenxa yokungqubuzana phakathi kwe-PTFE resin kanye nokungqubuzana phakathi kwe-PTFE resin kanye nodonga lwesikhunta, kanye nokunwetshwa kwevolumu yomkhiqizo owakhiwe ngaphambilini ngesikhathi sokucwiliswa esibunjeni, umkhiqizo owenziwe ngaphambilini uyagaywa futhi upholiswe ube yinto eqhubekayo ngaphansi kwengcindezi.Izinzuzo zale ndlela zimi kanje: akukho ukugunda okwenzeka enqubweni yokubumba, isisindo samangqamuzana esihlobene sinciphisa kancane, ikhwalithi yomkhiqizo yinhle, futhi ayinqunyelwe isisindo samangqamuzana esihlobene.Kodwa-ke, ngenxa yendawo encane yokuxhumana phakathi kwezinto zokusetshenziswa kanye nezingxenye zokushisa kwinqubo ye-extrusion, ukusebenza kahle kokushisa kuphansi, okunciphisa isivinini sokukhipha.
6. Ezinye izindlela zokucubungula;
I-PTFE ingaphinda icutshungulwe ngokubunjwa komjovo, ukubumba kwe-calendering, ukubumba okunamathelayo noma ukubumba kwesibili.
Isikhathi sokuthumela: Jul-31-2018