Iyo crystallization inonyungudika yePTFE i327 ℃, asi resin haigone kunge iri mukunyunguduka kusvika yave pamusoro pe380 ℃, uye kunyunguduka kwacho kwakakwira se1 010 Pa*S.Mukuwedzera, PTFE ine yakasimba solvent resistance.Nokudaro, haigoni kunyunguduka nzira yekugadzira, haigoni kunyungudutswa nzira yekugadzira, kazhinji kugadzirwa kwezvinhu zvayo kunogona kungoita sesimbi uye ceramic processing - sampuli, yekutanga poda compaction, ipapo sintering uye mechanical processing, kana kuburikidza ne extrusion molding, isotactic pressing. kuumba, kuvhara kuumba uye kuumba calendering nedzimwe nzira dzekugadzirisa.
Iyo crystallization inonyungudika yePTFE i327 ℃, asi resin haigone kunge iri mukunyunguduka kusvika yave pamusoro pe380 ℃, uye kunyunguduka kwacho kwakakwira se1 010 Pa*S.Mukuwedzera, PTFE ine yakasimba solvent resistance.Nokudaro, haigoni kunyunguduka nzira yekugadzira, haigoni kunyungudutswa nzira yekugadzira, kazhinji kugadzirwa kwezvinhu zvayo kunogona kungoita sesimbi uye ceramic processing - sampuli, yekutanga poda compaction, ipapo sintering uye mechanical processing, kana kuburikidza ne extrusion molding, isotactic pressing. kuumba, kuvhara kuumba uye kuumba calendering nedzimwe nzira dzekugadzirisa.
1. Kuumba
Molding parizvino ndiyo inonyanya kushandiswa kuumba nzira yePTFE.Molding tekinorojichimwe chinhu chekuumba (upfu, girafu, fibrous material, nezvimwewo) musimbi mold, in - - fixed temperature, pressure - - nzira yekugadzira.Mapolymer akaumbwa haana kuganhurirwa nehuremu hwawo hwemamorekuru, uye anenge ese mapurasitiki anogona kuumbwa.Zvinhu zvikuru zvekuumba ndezvi;Mutengo wakaderera, midziyo yakapfava, mari shoma, isina kuganhurirwa nehuremu hwemamorekuru emapurasitiki akagadzirwa;Izvo zvisingabatsiri ndezvakaderera kugadzirwa kwekuita, kukwirira kwevashandi uye kusagadzikana kwemhando yechigadzirwa.PTFE ndeyehuremu hwemamorekuru uye hunyoro hwakanyanya.Kana dzimwe nzira dzekugadzirisa dzisati dzakura, zvigadzirwa zvePTFE zvinonyanya kugadziriswa nekuumbwa pasi rese.
Mukuumba inogona kupatsanurwa kuita nzira shanu zvichienderana nemusiyano weiyo nzira: (1) kudzvanya - kudzvanya nzira yekutsikirira (inozivikanwawo seyemahara sintering nzira); (2) sintering - kudzvanya nzira; (3) nekukurumidza kupisa kudzvanya. nzira;(5) kudzvanya panguva imwe chete uye sintering nzira.
2. Hydroform nzira
Hydraulic pressure nzira, inozivikanwawo senzira yekuenzanisa, isobaric pressure nzira kana rubber molding nzira, ndeyekuwedzera PTFE resin zvakaenzana pakati pebhegi nemadziro ekuumba, uyezve kubhegi mumvura (inowanzo shandiswa mvura), kumanikidza kwe rubber bag kune mold madziro ekuwedzera, compacting resin uye kuva preformed chigadzirwa - nzira.Iyi nzira inogona kushandiswa kugadzira yakakura-vhoriyamu sleeve, yepasi yekuchengetedza tangi, hemispheric shell, tower column, hombe slab, nezvimwewo, pamwe chete nezvigadzirwa zvakaoma nePTFE composite chimiro, senge tee, gokora uye chimiro.Mabhenefiti makuru e hydraulic molding ndeye chimiro chakareruka chemidziyo uye mold - pombi yemvura yakajairika inotsiva iyo yakakwirira-tonnage press, uye zvigadzirwa zvinomanikidzwa zvakaenzana uye zvakanyanya - zvichikonzera kugadzirwa kwezvinhu zvakakura, maumbirwo akaomarara uye nyore lining chimiro. .
3. Sunda kuumba
Push pressure inozivikanwawo sepaste extrusion molding, 20-30 mesh sieve ye disperse resin uye organic additives (toluene, petroleum ether, solvent mafuta, chiyero cheresin huremu hwe 1/5) yakasanganiswa kuita paste, prepress mumadziro gobvu cylindrical isina chinhu. , wobva waisa mupush press machine barrel, pasi pekudziya neplunker push molding.Mushure mekuomeswa uye kunyura patembiricha ye360 ~ 380 ° C, kusunda kwakasimba uye kwakaomarara nekumanikidza chubhu uye zvigadzirwa zvebhawa zvinowanikwa mushure mekutonhora.Zvigadzirwa zvekusundidzira nekutsikirira zvinogumira kutsvimbo ine dhayamita ye16mm kana pasi uye pombi ine madziro ukobvu hwe3mm kana pasi.
4. Spiral extrusion molding
Iyo screw extruder yePTFE poda yakasiyana neye extruder inoshandiswa nemamwe thermoplastic plastiki.Iyo extrusion molding yeakajairwa thermoplastic mapurasitiki ndeyekusundira zvinhu kumberi nerubatsiro rwekutenderera, uye panguva iyi kumanikidza, kugera nekusanganisa izvo zvinhu.Izvo zvinhu zvakare zvakanyungudutswa nekupisa kunogadzirwa neshear simba uye kunze kwekudziya kweiyo silinda yezvinhu.Nekudaro, iyo screw ye PTFE extruder inongotora basa rekufambisa uye kusunda, kuitira kuti zvinhu zvipfuure nemusoro we-single-screw extruder nekaviri-musoro shinda uye iyo yakafanana pitch nekudzika, uye yobva yapinda mumuromo mold. sintering uye kutonhora, uye mafomu ane kudzvanywa kunopihwa neanopikisa-pressure mudziyo kuzadzisa chinangwa chinoenderera.Zvinowanzonetsa kugadzirisa PTFE ne single screw extruder.Iyo yakaderera friction coefficient yePTFE poda inokonzera skidding panguva yekudyisa, iyo inoderedza zvakanyanya kutakura kugona kwe screw.Uye nekuda kwekupisa kwekukwenya, kunogona kuita kuti hupfu hunamire kune screw kana mbiya, zvichiita kuti kudya kuome uye kusagadzikana.
Mumakore achangopfuura, mapatya-screw akashandiswawo mukugadzirisa zvinhu zveiyi yakakosha hunhu.Nheyo yayo yekudyisa yakasiyana neyeimwe-screw extruder, uye ine yakanaka yekufambisa basa, iyo inogona kukunda dambudziko rekutsvedza reUHMWPE poda mu screw uye inovandudza zvakanyanya kugona kwekudya kwe screw.Iyo counter-inotenderedza twin-screw extruder ine zvirinani kusanganisa uye homogenization mhedzisiro pane imwechete-direction twin-screw extruder, asi nekuda kwesimba rayo rakakura rekuparadzanisa, kuita kwekuveura pamugero we screw yakakura, izvo zvinoita kuti zvinhu zviwedzere kupisa. , uye molecular uremu hwe extruder inogona kudonha neanenge 40%.Kana gap rakakura uye screw haina kubatanidzwa, zvinhu zvinonamatira kune inopisa simbi.Zvisinei, kushandiswa kwekutenderera kwakafanana kwepatya screw extruder, hapana dambudziko rakadaro.Material mu extruder nekuveura chiito chezvidiki, plasticizing inodiwa huwandu hwekupisa, zvese kubva pamwe nekupisa sosi, uye nekudaro inogona kunyatso kudzora, iyo inogona kuita iyo zvinhu mu extrusion process kuderedza kupisa kupisa, panguva imwe chete kuti uchengetedze kuyerera kwezvinhu zvakajairwa uye kugadzikana mumhino, saizi yechikamu chemhino yekugadzira inofanirwa kuenderana nehuwandu hweiyo screw inotakura zvinhu.Kumhanya kweScrew hakusi kukurumidza, kazhinji kunosvika gumi paminiti.Kuti udzivise zvinhu zvakangoerekana zvanamatira kune simbi pamusoro, tembiricha yeextrusion inofanira kunyatsodzorwa.
5. Plunger extrusion molding
Plunger extrusion processing plastic, plastic processing inzira yechinyakare, kubva pakabuda nyaya iyi, vanhu vakatanga kushandisa nzira iyi kugadzira mapurasitiki.PTFE inogadziriswa neplunger extruder nekudzvanya resin yehuwandu muinlet mold, ichiita kuti plunger idzoke uye nekuitsikirira kuita chigadzirwa chakafanorongwa.Saka kumashure nekumberi, mumuromo mold kuumba multi - stage pre - molding zvigadzirwa.Nekuda kwekukweshana kuri pakati pePTFE resin uye kukweshana pakati pePTFE resin uye mudhuri weforoma, uye kuwedzera kwevhoriyamu yechigadzirwa chakafanogadzirwa panguva yekunyura muforoma, chigadzirwa chakafanoiswa chinoputirwa uye chakatonhodzwa kuita chinoramba chiri pasi pekumanikidzwa.Zvakanakira nzira iyi ndezvizvi: hapana kuveura kunoitika mukuumbwa, huremu hwema molecular huremu hunoderera zvishoma, mhando yechigadzirwa yakanaka, uye haina kuganhurirwa nehuremu hwemamorekuru.Nekudaro, nekuda kwenzvimbo diki yekusangana pakati peyakasvibirira uye kupisa zvikamu mu extrusion process, iyo yekupisa inoshanda yakaderera, iyo inomisa iyo extrusion kumhanya.
6. Dzimwe nzira dzekugadzirisa;
PTFE inogonawo kugadziriswa nekuumbwa kwejekiseni, kuumba calendering, kupeta kuumba kana kuumba yechipiri.
Nguva yekutumira: Jul-31-2018