Indlela ye-Carrier spinning
1.Ukujikeleza okumanzi2.Ukusonta okomileyo
3.Nyibilikisa indlela yokusonta
Ukujikeleza okumanziUkujikeleza okumanzi kwe-PTFE ngokuqhelekileyo kwi-viscose okanye i-polyvinyl alcohol (PVA) njengomthwali, xuba ne-PTFE powder okanye i-emulsion dispersion, kwaye ungeze inani elincinci le-boric acid, wenze isisombululo esijikelezayo, wenze ukujikeleza okumanzi, intloko ejikelezayo efakwe kwi-sodium sulfate kunye ne-ammonium. I-sulfate coagulation bath, i-dope esuka kwi-nozzle kwi-bath ye-coagulation yoqina ibe yifayibha, ifayibha emva kokuvuza i-roller ethambileyo yokuvuza kwamanzi, kwakhona emva kwe-oyile roller kunye ne-roller yokomisa ngokulandelelana, kwi-380 ~ 400 ℃ ubushushu obuphezulu bokutshisa, susa i-PVA carrier carbide, yolule ukwenza I-PTFE ifayibha ngaphantsi kwe-350 ℃.Le ndlela yokusonta inkqubo yokuchitha inzima, iindleko eziphezulu zokusetyenzwa kunye nokusetyenziswa kwamandla kunye nokuchitha ixesha.UGuo Yu-hai kunye nabanye baqulunqa indlela ekhawulezayo yokulungiselela i-PTFE fiber.Le ndlela iya kuqala ngokulungelelanisa ubunzima obuphantsi bemolekyuli yobunzima obuguquguqukayo be-organic solvent kunye namanzi, phantsi kwemeko yokuvuselela nge-PVA, qhubeka ushukuma de unyibilike ngokupheleleyo, umxube wesisombululo samanzi se-PVA.Emva koko isisombululo samanzi se-PVA kunye ne-persulfate, i-PTFE dispersion mixing uniformity, i-dope.Emva koko i-borate okanye i-boric acid inyibilikiswe emanzini, kunye nokulungelelaniswa kwe-alkaline pH njenge-alkaline, i-mixed coagulation bath.Ekugqibeleni yamkele izixhobo zokujikeleza ezimanzi zesiqhelo , ulwelo olujikelezayo olugqithisela kumbhobho, ngemitha yempompo yokulinganisa, ukujikeleza ngokuthe ngqo kwibhafu yokudibanisa, emva koko ukomisa, ukuthambisa kunye nokolula, i-PTFE fiber yenziwa.
Ukusonta okomileyo
Le ndlela yijeli ye-PTFE ebonwa ngokujikeleza okomileyo.I-PTFE i-dispersion yokuqala egxininiswe kunye ne-PVA edibeneyo, yongeza i-gel regulator boric acid okanye i-Borate salts kunye ne-alkalis zilungelelanise i-pH kwi-alkaline, i-whisking ukuya kukwanda ngokukhawuleza kwe-viscosity kunye nokwakheka kwejel, zisonta isisombululo.Uze womise usebenzisa izixhobo eziqhelekileyo zokusonta, uxinzelelo lwerhasi okanye ulwelo lokujija kwintloko ejikelezayo, ulinganiswe kwiimpompo zemitha, ukusonta owomileyo, emva koko womiswe, umxube olungiselelwe wePTFE kunye ne-PVA fiber.Ekugqibeleni usebenzisa izixhobo eziqhelekileyo ze-sintering kunye nokwelula, ziya kuxuba i-sintering ukususa i-PVA fiber, ekugqibeleni emva kokwelula inkqubo yokwelula, ukulungiswa kwefayibha ye-PTFE.
Indlela ye-Carrier spinning yeyona ndlela ikhulileyo yokulungiselela i-PTFE ifayibha, kwaye ibe yenye yeenkampani ezimbalwa ukuqaphela ushishino.Phakathi kwabo, inkampani ye-toray yaseJapan isebenzisa i-mass fraction 60%, ubungakanani be-particle ubukhulu be-0. 3 microns ye-PTFE, kunye neqhekeza elikhulu le-2% ye-sodium alginic acid isisombululo esinamanzi se-emulsoid edibeneyo yokujikeleza, i-fiber ngokudibanisa, ukuhlamba kwakhona emva ukuhlamba, ukomisa, nangaphantsi kwe-380 ℃ ukunweba okushushu, ukususwa kwe-alginic acid yesodium, ukufumana i-PTFE ifayibha, i-monofilament yayo ye-linear density ye-0. 67 dtex kunye namandla okuphuka kwe-l.I-25 cN/dtex, i-elongation kwikhefu ukuya kwi-59%, indlela yokujikeleza i-dope spinnability engcono kune-viscose njengomthwali we-PTFE dope spinnability.Amashishini e-Showa, ukusetyenziswa kwe-114 ye-mass fraction ye-60% PT - 100 FE i-emulsion ehlakaziweyo kunye ne-cellulose ye-mass fraction ye-8.9% ye-viscose yokujikeleza isisombululo sokujikeleza, emva kokuqiniswa kwemicu ye-nascent ngamanzi, i-fluid liquid, kunye ne-0. 05 mol / Ukucutshungulwa kwe-L Na0H, kunye ne-fiber yokushisa ukushisa phantsi kwe-280 ℃ kunye nokwelula okushushu phantsi kwe-320 ℃, unyango lokugqibela lokushisa i-72 h phantsi kwe-320 ℃, amandla okuqhawula i-fiber ye-1. 16 cN / dtex elongation ngexesha lekhefu yi-16.1%.Ukongeza, isityalo sokubonisa saseBeijing siya kuba yi-60% ye-mass fraction ye-PTFE emulsion kunye ne-10% ubukhulu beqhekeza lesisombululo se-PVA ngokulingana kwe-1: 1.5 isisombululo sokujikeleza, emva kokuqinisa i-fiber nge-acetal, ukuhlamba, ukomisa, ukuxubha kunye nokwelula. Inkqubo yefiber ye-PTFE.
Ukusika indlela yokuqhawula ifilimu ekuqaleni kweminyaka yee-1970 yinkampani yase-Austrian Lenzing yophuhliso kunye noshishino, ekulungiseleleni i-PTFE fiber, kufuneka wenze i-PTFE powder sinter cylindrical PTFE parison, ukuyisika kunye nobukhulu obuthile befilimu, kwaye emva koko ngesixhobo serrated yahlulwe yaba yisilika, ngaphezulu kwendawo yokunyibilika (327 ℃) sintering, ngoko ukolula kwaye iphele ngonyango lobushushu lwe-PTFE.Le ndlela inokufumana i-fiber ene-microporous structure, kunye namandla aphezulu.I-Multifilament ingasetyenziswa njengesixhobo sokutywina, iifiber ezimfutshane, zingasetyenziswa kwinaliti ivakale.
Ukongeza, ifilimu ye-PTFE okanye i-sheet nayo inokusikwa ibe ngububanzi obuncinci, kwaye emva koko iya ngqo kwilaphu elimxinwa elenziwe ngamandla aphezulu e-PTFE imicu.Kodwa kunzima ukugcina iyunifomu efunyenwe ngokusika ecaleni kolwalathiso lwe-longitudinal ngobubanzi obumxinwa belaphu, kunye nelaphu elimxinwa livame ukuphelisa inxalenye yefibril, ukunwebeka kakhulu kwilaphu elimxinwa I-PTFE fibers yaphuka ngokulula okanye ngokusika inxenye kwicala le-longitudinal. yefilimu yi-filament PTFE inwebu yokuqhelaniswa nayo.Ecaleni inwebu yolwalathiso longitudinal kunye kwicala elinqamlezayo ifilim kunye imilo az okanye imilo yomgca-convex embossed kunye nokusikwa, intambo isiphumo kuquka iifibrils ngokuyinxenye eyaphukileyo umthetho isakhiwo womnatha.Iintsinga ze-PTFE zivelise ngale ndlela iifibrili ezizimeleyo ezinobungakanani obuphakathi kunye nobukhulu obufanayo.
IJapan Asahi yeNkampani ngokusika ifilimu yokuqhekeka ngokusemthethweni ibe namandla aphezulu, kunye nokusebenza kweekhemikhali ezichasayo kugqwesileyo kumsonto we-PTFE.iya kuqulatha izinga lomngxuma i-48% yefilimu ye-PTFE ikrazuka ibe yi-222 dtex yefiber, kwakhona kwi-twist yayo eyongeziweyo ukuya kwi-750 twist/m, kwi-440 ℃ kunye ne-1 000 m/min i-Xia stretch, ifumane i-fiber line density ye-55 dtex, kwaye iqulethe izinga lomngxuma 1%, imodyuli ukuya kuthi ga kwi-294 cN/dtex.
Ncamathelisa indlela yokusonta ye-extrusion Ncamathelisa i-extrusion spinning ngokuqhelekileyo i-PTFE engumgubo 16% ~ 25% eneqhezu lobunzima lemixube yezithambiso eziguquguqukayo, shunelela kwintlama, eyenziwe ngeembumba ezimilise okwethutyana, kwaye phantsi koxinzelelo oluthile ngokusebenzisa i-spinneret enentambo ye-die extrusion spinning, emva koko. ngokumisa, ukuthambisa, ukolula okuphezulu phantsi kobushushu obuphezulu, umsonto omhlophe onganxibanga.Ukongeza, nako ukucudisa izixhobo ifilimu extrusion okanye imicu ezicekethekileyo, ngoko ngenkqubo ukuqengqeleka ukususa izongezo, kunye nokusika longitudinal, umzobo kunye fluffy emva processing, yi PTFE imicu zazenziwe intlama extrusion yodonga olubhityileyo, ububanzi encinane kunye permeability of PTFE. ifayibha engenanto.I-PTFE powder kwiimeko ezingaphantsi kwendawo yokunyibilika eyenziwe nge-PTFE ifayibha engenanto, kwaye emva koko igxothwe i-10 min kwi-350 ℃, i-250 ℃ phantsi kwe-400%, yayiyi-0.76 mm yangaphakathi ububanzi kunye nobukhulu bodonga lwe-0.10 mm, ububanzi obungaphantsi kwe-0.15 mm ye-fibers engenanto.
Kwi-1997, i-M. Shimizu iphakamisa indlela yokulungiselela amandla aphezulu kunye ne-PTFE fibers nge-paste extrusion.Idityaniswe kwi PTFE powder mass fraction 20% of lubricants, embryo, extrusion, wafumana ucingo olunye, unyango eshushu emva koko 350 ℃ 1.5h, kunye 387 ℃ ukuya 50 mm/min yesantya esolula 10 amaxesha, wafumana amandla kangangoko 1.56 ~ 2.82 GPa PTFE iintsinga.
I-PTFE powder yayixutywe ne-lubricant (isoparafini oil Isopar-E) ukwenza i-paste, ime kwi-0 ℃ 180 h kwi-40 ℃ iphilise i-30 h, yenza umxube uphelele ukumanzisa kunye nokudumba, uze ucinezele i-embryo kunye ne-extrusion , uphathe i-2 h. phantsi kwe-340 ℃, kwaye emva koko ukuya ku-0. 5 c/min isantya phantsi ukuya kwiqondo lobushushu begumbi, ekugqibeleni ukolula ukuze ungene kwi-370 c PTFE ifayibha, 3.5 ~ 4.0 cN/dtex amandla okwaphuka, ukunweba kwikhefu yi-22%.
Nyibilikisa indlela yokusonta
I-Melt spinning ngumxholo we-PTFE ukuya kwi-4% ~5% ye-perfluorinated ethylene copolymer ye-perfluoro-n-propyl ether exutywayo ejikelezayo enyibilikayo, emva kokujikelezwa ngoomatshini be-screw extrusion bampompa umngxuma woxinzelelo lobungakanani benaliti, iyenze ibe ngumsinga ocolekileyo emoyeni, kunye nokupholisa. kumjelo ojikelezayo kucingo.I-PTFE i-fibers ephezulu yale ndlela, kodwa i-PTFE i-supermolecular structure itshintsha emva kokunyibilika, okukhokelela kwi-ductility yayo yanyamalala kwaye i-molecular chain orientation stretch ivaliwe, kunye ne-PTFE i-viscosity ephezulu kunye nokuguquguquka okubonakalayo, i-PTFE inyibilika i-fiber elungiselelwe nge-screw extruder ukuthelekisa ngokuthe ngqo kunzima, kunzima ukufikelela kushishino.Indlela yePlunger extrusion inokuboyisa obu bunzima.I-plunger kwinkqubo ye-extrusion, ngenxa yomgangatho ophantsi kakhulu wamandla we-PTFE kunye ne-wall-slip phenomenon, ukunciphisa ukucheba okungeyomfuneko kwinkqubo yokuhamba, ukuze babe kwi-PTFE inyibilika ijikeleza.U-Li Min kunye nomnye umntu kwiyunivesithi yase-Donghua, balungiswa yi-PTFE fiber enobunzima obuphezulu be-molecular.I-Tervoort ngobunzima obuphezulu bemolekyuli obufana ne-PTFE kunye ne-PTFE exutywe kunye nobunzima be-molecular mass, ukunyibilika kokunyibilika, ukulungiselela i-PTFE filament.Iipropathi ze-PTFE fibers zivelise ngale ndlela zimbi ngakumbi kune-PTFE fiber ecocekileyo enobunzima obuphezulu be-molecular.
Ixesha lokuposa: Nov-04-2018