Waterproof Membrane Thermoplastic Ua
Jun 02, 2022
PVDF cov khoom ua cov txheej txheem
PVDF tuaj yeem ua tiav los ntawm cov txheej txheem thermoplastic xws li extrusion, txhaj tshuaj molding, pouring, molding thiab hloov molding.
(1) Extrusion
Qhov hnyav molecular PVDF yaj lub zog zoo dua, tuaj yeem raug extruded rau hauv cov yeeb yaj kiab nyias, daim ntawv, raj, pas nrig thiab lub tes tsho fais fab, thiab lwm yam., raws li cov khoom siv thiab cov khoom ua tiav, kev tswj qhov kub thiab txias hauv 210 ~ 290 degrees Celsius, molding kub tswj ntawm 180 ~ 240 degrees Celsius, yuav tsum nruj me ntsis tswj qhov kub thiab txias tsis tuaj yeem ua rau kub tshaj nws lub sij hawm ntev melting kub. Extrusion molding khoom tuaj yeem xaiv cov ntsia hlau dav dav extruder.
(2) txhaj tshuaj molding
Tsawg molecular hnyav PVDF yaj txaus tus nqi yog siab, yuav tsum tau txhaj tshuaj molding txheej txheem rau kev ua, feem ntau yog siv dav txhaj molding tshuab, tab sis lub tog raj kheej plunger, nozzle, thiab lwm yam yuav tsum yog corrosion-resistant Ni-raws li alloy.
(3) nchuav
PVDF tau teeb tsa raws li cov ntsiab lus ntawm 20 feem pua tshuaj, nrum rau ntawm aluminium ntawv ci, tom qab 205 ~ 315 degrees Celsius kub yaj, cov dej quenching tuaj yeem ua rau tuab 0.05 ~ 0.075 mm Nruam zaj duab xis,
(4) molding
Feem ntau, PVDF pellets yog preheated nyob rau hauv qhov cub los yog preheating rauv, preheating ntawm ib tug kub ntawm 215 mus rau 235 degrees Celsius, thiab cov khoom preheated ces ntxiv rau preheated 180 mus rau 195 degree C pwm ntawm 14 MPa Siab, tuav lub siab, tuav. lub sij hawm nyob ntawm lub sij hawm xav tau rau melting thiab ntws. Cov khoom tuab-walled yuav tsum tau txias rau 90 degrees Celsius hauv qab lub siab kom stripping, thiaj li yuav zam cov khoom ua npuas lossis deformation ntawm lub tshuab nqus tsev.
(5) hloov molding
Feem ntau yog thawj zaug siv cov yas extruder, thiab tom qab ntawd cov khoom thauj mus rau lub tank cia, los ntawm lub twj tso kua mis piston mus rau cov khoom hauv lub tank cia rau hauv pwm, thiab lub zog txias. Txawm hais tias nws yog molding los yog hloov molding, feem ntau yog siv los tsim loj, tuab phab ntsa thickness ntawm cov khoom.
(6) lwm txoj kev ua
Kev ua PVDF kuj tseem tuaj yeem impregnated, co-extruded, nyob rau hauv txoj kab nrog kev siv tshuab.
PVDF hloov membrane
PVDF yog cov khoom siv muaj zog, corrosion-resistant, feem ntau yog siv los ua cov kav dej. PVDF daim nyias nyias tuaj yeem khi cov protein thiab sib cais me me ntawm cov proteins uas yog siv los ua cov protein ntau vim tias cov nitrocellulose membrane degrades hauv Edman reagent, yog li PVDF yog nrhiav los hloov, txawm hais tias PVDF membrane khi qhov kev ua tau zoo ntawm cov protein tsis siab rau. nitrocellulose daim nyias nyias, tab sis vim nws stability, corrosion kuj ua rau nws zoo tagnrho rau protein sequencing thiab tau siv rau tam sim no. PVDF membrane thiab nitrocellulose membrane, tuaj yeem ua ntau yam staining thiab chemiluminescence nrhiav pom, tab sis kuj muaj ntau yam kev siv. Qhov no PVDF daim nyias nyias, rhiab heev, kev daws teeb meem thiab protein affinity nyob rau hauv cov txheej txheem zoo tshaj li cov pa membrane yog siab, haum rau tsawg molecular yuag protein nrhiav kom tau.
Txawm li cas los xij, kev siv PVDF daim nyias nyias ua ntej, yuav tsum ua ntej pretreatment nrog anhydrous methanol, thiab tom qab ntawd hauv kev hloov pauv tsis tuaj yeem siv tau zoo (PVDF membrane nrog methanol npuas yog tsim los qhib PVDF zaj duab xis saum toj no cov pab pawg zoo, ua kom yooj yim dua. Nrog rau qhov tsis zoo them cov protein). Tom qab pretreatment ntawm PVDF daim nyias nyias nyob rau hauv cov ntaub ntawv hloov lwm lub tsev, koj yuav siv tau yam tsis muaj methanol hloov tsis. Kev siv NC zaj duab xis, thiab qee qhov yuav tsum tau siv cov tshuaj anhydrous methanol, thiab qee qhov tsis tas yuav siv cov kev hloov pauv tsis zoo yuav ua tau zoo.
Lithium hlau phosphate roj teeb nrog acetone yaj PVDF (polyvinylidene fluoride) thaum cov nyhuv tsis zoo.
kaum rau. PVDF Piezoelectric Film Synthesis Method
Vinylidene fluoride ua raw khoom los ntawm polymerization. PVDF piezoelectric zaj duab xis yog npaj los ntawm dissolving PVDF resin nyob rau hauv dimethylformamide, npaj rau hauv 1 feem pua ~ 10 feem pua tov, purified los ntawm defoaming tom qab casting txoj kev, muab tso rau hauv lub tshuab nqus tsev ziab, ua los ntawm 150μm thickness ntawm cov zaj duab xis. Los ntawm txoj kev ntawm uniaxial oriented stretching, cov saw molecular yog oriented ntawm ib tug high degree ntawm kev taw qhia, thiab cov kev taw qhia kev taw qhia yog tsau kom pom ib-type crystal theem.
Kaum xya. PVDF Piezoelectric Zaj duab xis Performance
PVDF yog cov khoom siv organic piezoelectric, tseem hu ua piezoelectric polymer. Qhov zoo ntawm cov ntaub ntawv thiab lawv cov ntaub ntawv yog hloov tau, tsis tshua muaj ceev, tsis tshua muaj impedance thiab high voltage voltage tas li (g), thiab lwm yam, thiab kev loj hlob sai heev, daim ntawv thov ntawm underwater acoustic ultrasonic ntsuas, siab sensing, ignition detonation thiab thiaj li. ntawm. Qhov tsis zoo yog tias qhov piezoelectric strain tas li (d) yog qhov tsawg heev uas nws raug txwv zoo heev raws li cov khoom siv hluav taws xob emission transducer.