Theknoloji ea ho itokisa ea PTFE fiber

Mokhoa oa ho bilika oa carrier

1.Ho ohla ho metsi2.Ho ohla ho omileng

3.Qhibiliha mokhoa oa ho ohla

Ho ohla ho metsiPTFE e ohiang ka metsi hangata ka viscose kapa polyvinyl alcohol (PVA) e le sejari, kopanya le PTFE phofo kapa emulsion dispersion, 'me u kenye tekanyo e nyenyane ea boric acid, etsa tharollo ea ho phunya, ho etsa spinning e metsi, hlooho e ohiang e kenngoa ka sodium sulfate le ammonium. sulfate coagulation bath, dope e tsoang molomong ka bateng ea coagulation e tiileng ka har'a fiber, fiber ka mor'a leaching roller ea metsi a bonolo, hape ka mor'a ho roala oli le ho omisa ka ho latellana, ka 380 ~ 400 ℃ mocheso o phahameng oa sintering, tlosa PVA carrier carbide, otlolla ho etsa PTFE faeba ka tlase ho 350 ℃.Mokhoa ona oa ho ohla o sebelisa mokhoa o boima, litšenyehelo tse phahameng tsa ho sebetsa le tšebeliso ea matla le nako e ngata.Guo Yu-hai le ba bang ba ile ba qapa mokhoa o potlakileng oa ho lokisa PTFE fiber.Mokhoa ona o tla qala ka ho kopanya ka mokhoa o ts'oanang oa boima ba limolek'hule tse fokolang tsa motsoako oa metsi le metsi, tlas'a boemo ba ho tsosoa ka PVA, tsoela pele ho sisinyeha ho fihlela motsoako oa PVA o qhibiliha ka ho feletseng.Ebe tharollo ea metsi ea PVA le persulfate, PTFE dispersion mixing uniformity, dope.Ebe borate kapa boric acid e qhibiliha ka metsing, ka alkaline pH phetoho e le alkaline, motsoako coagulation bath.Qetellong amohela lisebelisoa tse ohiang tse metsi tsa tloaelo, mokelikeli o ohiang o fetisetsang molomong oa molomo, ka metering pump metering, ho ohla ka ho toba ka bateng ea coagulation, ebe o omisa, o otlolla le ho otlolla, fiber ea PTFE e etsoa.

Ho ohla ho omileng

Mokhoa ona ke PTFE gel e lemohuoang ka ho ohla ho omileng.PTFE ke pele concentrated dispersion le PVA blended, eketsa gel regulator boric acid kapa Borate matsoai le alkalis fetola pH ho alkaline, whisking ho ka tšohanyetso keketseho ea viscosity le gel sebopeho, ke ho ohla tharollo.Ebe o li omisa ka lisebelisoa tse tloaelehileng tsa ho ohla, khatello ea khase kapa mokelikeli o ohiang ho hlooho e ohiang, e lekantsoeng ka lipompo tsa metering, ho ohla, ebe o omisitsoe, motsoako o lokiselitsoeng oa PTFE le PVA fiber.Qetellong ho sebelisa lisebelisoa tse tloaelehileng tsa sintering le ho otlolla, ho tla kopanngoa sintering ho tlosa fiber ea PVA, qetellong ka mor'a ho otlolla mokhoa oa ho otlolla, ho lokisetsa fiber ea PTFE.

Carrier spinning method ke mokhoa o hōtseng ka ho fetisisa oa ho lokisa PTFE fiber, 'me e bile e' ngoe ea lik'hamphani tse 'maloa tse hlokomelang tsoelo-pele ea indasteri.Har'a bona, k'hamphani ea Japane ea toray E SEBELISA karoloana ea boima ba 60%, karolelano ea boholo ba likaroloana e ne e le 0. 3 microns ea PTFE, le karolo e boima ea 2% ea sodium alginic acid aqueous solution ea emulsoid mix spinning, fiber by coagulation, bath hape ka mor'a ho hlatsoa, ​​​​ho omisa, le tlas'a 380 ℃ ho otlolla ho chesang, ho tlosoa ha alginic acid sodium, ho fumana PTFE fiber, monofilament linear density ea 0. 67 dtex le matla a fracture ea l.25 cN/dtex, elongation nakong ea khefu ea ho fihla ho 59%, mokhoa oa ho phunya dope spinnability molemo ho feta ka viscose e le mojari oa PTFE dope spinnability.Liindasteri tsa Showa, tšebeliso ea karolo ea 114 ea boima ba 60% PT - 100 FE e qhalakantsoeng emulsion le selulose ea karoloana e boima ea 8.9% viscose spinning solution, ka mor'a ho tiisa likhoele tse sa tsoa khuoa ka metsi, penya mokelikeli, ka 0. 05 mol/ Ho sebetsa ha L Na0H, le phekolo ea mocheso oa fiber tlas'a 280 ℃ le ho otlolla ho chesang ka tlas'a 320 ℃, phekolo ea ho qetela ea mocheso 72 h tlas'a 320 ℃, matla a ho senya fiber bakeng sa 1. 16 cN / dtex elongation nakong ea khefu e ne e le 16.1%.Ho phaella moo, semela sa pontšo ea Beijing e tla ba karolo ea 60% ea boima ba PTFE emulsion le 10% ea karoloana ea boima ba PVA ka tekanyo ea 1: 1.5 tharollo ea ho phunya, ka mor'a ho tiisa fiber ka acetal, ho hlatsoa, ​​ho omisa, ho sintering le ho otlolla ho Sistimi ea fiber ea PTFE.

Mokhoa oa ho khaola filimi "Ho seha mokhoa oa ho phatloha ha filimi mathoasong a lilemo tsa bo-1970 ke nts'etsopele le nts'etsopele ea khamphani ea Austria Lenzing, ha ho lokisoa fiber ea PTFE, ho hlokahala ho etsa PTFE powder sinter cylindrical PTFE parison, ho e khaola ka botenya bo itseng ba filimi. ebe ka sesebelisoa serrated arotsoe ka silika, ka holimo ho ntlha e qhibilihang (327 ℃) sintering, ebe ka ho otlolla le ho qetella ka PTFE faeba mocheso mocheso.Mokhoa ona o ka fumana fiber e nang le sebopeho sa microporous, le matla a phahameng.Multifilament e ka sebelisoa e le lisebelisoa tsa ho tiisa, likhoele tse khutšoane, li ka sebelisoa ka har'a nale.

Ho feta moo, filimi kapa lakane ea PTFE le eona e ka khaoloa ka bophara bo nyane, ebe e lebisa lesela le moqotetsane le entsoeng ka likhoele tse matla tsa PTFE.Empa ho ke ke ho le thata ho boloka junifomo fumanoa ka seha hammoho le longitudinal tataiso ka bophara moqotetsane ea lesela, 'me lesela moqotetsane atisa ho qetella karolo ea fibril, haholo otlolla ka lesela moqotetsane PTFE likhoele habonolo robehile kapa ka ho itšeha leeme ka tsela ea longitudinal tataiso. ea filimi ke filament PTFE membrane orientation.Hammoho le lera la tataiso longitudinal le ka tsela e pharalla ea filimi le az sebopeho kapa linear-convex sebopeho embossed le sehiloeng, sephetho le filament ho akarelletsa le fibrils motho karolo e itseng robehileng puso ea netweke sebopeho.PTFE likhoele hlahisa ka tsela ena li-fibrils motho ka mong ka karolelano boholo bo boholo le junifomo boholo.

Japan Asahi of into Corporation ka ho khaola filimi e molaong hore e be le matla a holimo, 'me lik'hemik'hale tsa ho hanyetsa li sebetsa hantle haholo tsa khoele ea PTFE.e tla ba le sekhahla sa lesoba la 48% ea filimi ea PTFE e tabohileng ho 222 dtex ea fiber, hape ka twist ea eona e kenyellelitsoeng ho 750 twist/m, ka 440 ℃ le 1 000 m/min Xia stretch, fumana fiber line density bakeng sa 55 dtex, 'me e na le sekhahla sa lesoba 1%, modulus ho fihla ho 294 cN/dtex.

Ho peista extrusion spinning mokhoa oa ho peitsa hangata PTFE phofo 16% ~ 25% e nang le karoloana e boima ea metsoako ea lubricant e feto-fetohang, e kopanyelletsa ho peista, e entsoeng ka mahe a entsoeng ka bōpeho, le tlas'a khatello e itseng ka spinneret e nang le lesela la die extrusion spinning, 'me joale ka ho omisa, ho sintering, ho otlolla holimo tlas'a mocheso o phahameng, khoele e tšoeu e sa tloaelehang.Ho phaella moo, ka boela pepeta filimi extrusion thepa kapa tšesaane hlobolisa, ka nako eo ka tshebetso rolling ho tlosa additives, le longitudinal itšeha, ho hula le fluffy ka mor'a ho sebetsa, ke PTFE likhoele li entsoe ka ho peista extrusion ea lerako tšesaane, bophara nyenyane le permeability ea PTFE. fiber e se nang letho.PTFE phofo maemong a ka tlase ho ntlha ea eona ea ho qhibiliha e entsoeng ka PTFE hollow fiber, ebe e lelekoa metsotso e 10 ho 350 ℃, 250 ℃ tlas'a 400%, e ne e le 0.76 mm ka hare le bophara ba lerako la 0.10 mm, bophara ba likhoele tse ka tlaase ho 0.15 mm.

Ka 1997, M. Shimizu o etsa tlhahiso ea mokhoa oa ho lokisa matla a phahameng le likhoele tsa PTFE ka ho peista extrusion.E kenyelelitsoe karolong ea boima ba phofo ea PTFE 20% ea mafura, embryo, extrusion, e fumane terata e le 'ngoe, phekolo e futhumetseng ebe 350 ℃ 1.5h, le 387 ℃ ho 50 mm / min ea lebelo le otlollang makhetlo a 10, e fumane matla a lekanang le 1.56 ~ 2,82 GPa PTFE likhoele.

Phofo ea PTFE e ne e kopantsoe le lubricant (oli ea isoparafini Isopar-E) ho etsa pente, e eme ho 0 ℃ 180 h ho 40 ℃ pheko ea 30 h, etsa motsoako o tletseng metsi le ho ruruha, ebe o tobetsa embryo le extrusion , tšoara 2 h. tlas'a 340 ℃, 'me joale ho 0. 5 c/min lebelo ho theosa ho mocheso kamoreng, qetellong otlolla ho fumana ka 370 c PTFE faeba, 3.5 ~ 4.0 cN/dtex matla fracture, elongation ka khefu ke 22%.

Qhibiliha mokhoa oa ho ohla

Melt spinning ke PTFE content ho 4% ~ 5% ea perfluorinated ethylene copolymer ea perfluoro-n-propyl ether e tsoakiloeng spinning melt, ka mor'a ho ohia ke mechine ea extrusion ea screw pump quantitative pressure ente lesoba, e etsa hore e be molapo o motle moeeng, le ho pholile. kanaleng e ohiang ka har'a terata.PTFE likhoele matla a phahameng a mokhoa ona, empa PTFE supermolecular sebopeho ka mor'a ho qhibiliha, e lebisang ductility lona nyamela le molek'hule orientation orientation stretched e koetsoe, hammoho le PTFE high viscosity le ho bonahala ho feto-fetoha ha maemo, PTFE melt fiber e lokiselitsoeng ke screw extruder bakeng sa ho bapisa ka ho toba ho thata, ho thata ho fihlella boithuto ba indasteri.Mokhoa oa plunger extrusion o ka hlola bothata bona.The plunger tshebetsong ea extrusion, ka lebaka la matla a tlase haholo a holim'a PTFE le ts'ebetso ea lebota-slip, e fokotsa ho kuta ho sa hlokahaleng ts'ebetsong ea phallo, kahoo ba ka ba ho PTFE ho qhibiliha ho ohia.Li Min le motho e mong univesithing ea Donghua, ba lokiselitsoe ke fiber ea PTFE e nang le boima bo phahameng ba limolek'hule.Tervoort ka boima bo phahameng ba limolek'hule tse kang PTFE le PTFE tse kopantsoeng le boima bo tlaase ba molek'hule, ts'ebetso ea ho qhibiliha, ho lokisa PTFE filament.Thepa ea likhoele tsa PTFE e hlahisitse ka tsela ena e mpe ho feta ea fiber e hloekileng ea PTFE e nang le boima bo phahameng ba molek'hule.