PVC resin yog qhov loj tshaj plaws ntawm PVC cable, thiab nws tus kheej zoo muaj kev cuam tshuam zoo rau cov khoom siv hluav taws xob thiab hluav taws xob ntawm cov ntaub ntawv cable.
1 Cov txheej txheem ntawm PVC
Feem ntau, ob qho tib si electron conduction thiab ion conduction yog pom nyob rau hauv polymers, tab sis qhov degree yog txawv.Qhov sib txawv loj tshaj plaws ntawm ob lub tshuab hluav taws xob yog qhov sib txawv ntawm cov neeg nqa khoom.Hauv cov polymers, cov kua dej ntawm cov khoom siv hluav taws xob yog cov khoom siv hluav taws xob dawb uas nws π bond electron yog delocalized.Cov kua dej ntawm ion conduction mechanism feem ntau yog qhov zoo thiab tsis zoo ions.Feem ntau ntawm cov polymers raws li hluav taws xob conductivity yog conjugated polymers, thiab PVC lub ntsiab saw feem ntau yog ib qho kev sib txuas, tsis muaj qhov sib txuas, yog li nws feem ntau ua hluav taws xob los ntawm ion conduction.Txawm li cas los xij, nyob rau hauv lub xub ntiag ntawm lub teeb tam sim no thiab UV, PVC yuav tshem tawm HCl thiab tsim cov khoom tsis zoo polyolefin, yog li muaj π-bonded electrons, uas tuaj yeem tsav hluav taws xob conduction.
2.2.1 molecular hnyav
Kev cuam tshuam ntawm molecular hnyav ntawm conductivity ntawm polymers yog txuam nrog lub ntsiab conductive mechanism ntawm polymers.Rau cov electron conductance, cov conductivity yuav nce vim qhov hnyav molecular nce thiab intramolecular channel ntawm electron ntev.Nrog rau qhov txo qis ntawm qhov hnyav molecular, ion tsiv teb tsaws nce thiab cov conductivity nce.Nyob rau tib lub sijhawm, qhov hnyav molecular kuj cuam tshuam rau cov khoom siv hluav taws xob ntawm cov khoom siv cable.Qhov siab dua qhov hnyav molecular ntawm PVC resin, qhov zoo dua nws qhov txias tsis kam, thermal stability thiab mechanical zog.
2.2.2 Thermal stability
Thermal stability yog ib qho tseem ceeb tshaj plaws thiab tseem ceeb indexes los ntsuas qhov zoo ntawm resin.Nws ncaj qha cuam tshuam rau kev siv tshuab ntawm cov khoom lag luam downstream thiab cov khoom ntawm cov khoom.Nrog rau kev siv ntau ntawm PVC cov ntaub ntawv hauv tsev, qhov kev thov rau thermal stability ntawm PVC resin tau nce siab dua.Kev laus whiteness yog ib qho tseem ceeb Performance index los ntsuam xyuas cov stability ntawm resin, thiaj li txiav txim siab thermal stability ntawm resin.
2.2.3 Ion ntsiab lus
Feem ntau, PVC ua hluav taws xob feem ntau yog los ntawm ion conduction, yog li ions muaj kev cuam tshuam loj rau kev ua.Cov hlau cations (Na+, K+, Ca2+, Al3+, Zn2+, Mg2+, thiab lwm yam) nyob rau hauv lub polymer ua si lub luag hauj lwm, thaum lub anions (Cl-, SO42-, thiab lwm yam.) muaj me ntsis cuam tshuam rau cov hluav taws xob conductivity vim lawv. loj vojvoog thiab qeeb migration tus nqi.Hauv qhov sib piv, thaum PVC tuaj yeem ua rau muaj kev cuam tshuam ntawm dechlorination nyob rau hauv hluav taws xob tam sim no thiab UV hluav taws xob, Cl- raug tso tawm, nyob rau hauv rooj plaub no anion plays lub luag haujlwm tseem ceeb.
2.2.4 Pom pom qhov ntom ntom
Cov qauv nrawm nrawm thiab roj nqus ntawm cov txhab cuam cuam tshuam rau cov khoom xa rov qab, thiab cov yas qhia ncaj qha cuam tshuam cov khoom ntawm cov khoom lag luam.Nyob rau hauv tib lub formulation thiab ua tej yam kev mob, cov resin muaj ib tug siab pom kev ceev thiab kuj tsis tshua muaj porosity, uas tej zaum yuav cuam tshuam rau cov hloov ntawm conductive cov ntaub ntawv nyob rau hauv lub resin, uas ua rau ib tug siab resistivity ntawm cov khoom.
2.2.5 lwm
PVC resin nyob rau hauv "fisheye", impurity ions thiab lwm yam khoom nyob rau hauv lub cable ntau lawm txheej txheem los ua pob zoo li impurities, yog li ntawd lub cable nto tsis du, cuam tshuam cov tsos ntawm cov khoom, thiab "knobs" nyob ib ncig ntawm lub tsim ntawm ib tug tej yam hluav taws xob. qhov sib txawv, rhuav tshem cov khoom siv PVC hauv kev ua haujlwm rwb thaiv tsev.
Raws tib yam kev ua si tom qab, cov qauv siv pom meej ,, ntxiv cov khoom lag luam ncaj qha cuam tshuam nrog cov nyhuv tom qab, thiab cov txheej txheem sib txawv ntawm cov nyhuv ua kom zoo rau qhov sib txawv ntawm qhov sib txawv ntawm cov khoom lag luam.
Tsis tas li ntawd, cov kev tshawb fawb tau pom tias cov tshuaj ntxiv nrog cov pab pawg ua haujlwm tuaj yeem qhia tau tom qab polyvinyl chloride polymerization, piv txwv li, thaum kawg ntawm kev sib txuas lossis ua ntej ziab kawg.Poly muaj 1 ~ 30% noo noo nrog tag nrho ntawm 0.0002 ~ 0.001% polycarboxylic acid, tuaj yeem txhim kho qhov ntim ntawm cov khoom.Kev taw qhia txog 0.1-2% phosphate ion uas muaj COMPOUNDS (alkyl hydrogen phosphate, ammonium oxyphosphate, C≤20 alkyl phosphate, organic phosphate) nyob rau hauv suspension polyvinyl chloride, thiab ntxiv ntawm alkaline ntiaj teb 0% so-1. tso lawv rau ntawm lub polymer, tuaj yeem txhim kho lub ntim tsis kam thiab dielectric tas li ntawm resin.
Post lub sij hawm: Sep-09-2022