Yas extrusion, xws li UPVC (txheej polyvinyl chloride) profiles los yog cov yeeb nkab khoom, yog tsim los ntawm kev sib tov, extrusion ua, shaping, nqa tawm, thiab txiav ntawm PVC resin thiab lwm yam additives. Cov yam ntxwv uas cuam tshuam rau kev ua tau zoo ntawm cov khoom siv npog txhua kauj ruam hauv cov txheej txheem tsim khoom. Txhua kauj ruam cuam tshuam thiab cuam tshuam ib leeg los ntawm kev tshaj tawm ntawm cov khoom. Ib qho teeb meem tuaj yeem them rov qab los ntawm lwm cov kauj ruam hauv qee qhov ntau, yog li txhua kauj ruam dhau los ua lub cev. Ntawm lawv, cov khoom siv raw, cov khoom siv mis thiab cov txheej txheem kev ua haujlwm yog cov ntsiab lus tseem ceeb hauv cov txheej txheem yas extrusion, uas cuam tshuam ncaj qha rau qhov zoo thiab cov khoom ntawm extrusion molding. Kab lus no tsom mus rau qhov cuam tshuam ntawm extrusion los ntawm kev xav ntawm cov khoom siv extrusion thiab cov khoom siv raw.
Feem ntau, PVCCov khoom siv cov khoom siv hauv qab no los ua cov txheej txheem extrusion:
1. PVC cob:
Polyvinyl chloride, hu ua PVC hauv lus Askiv, yog qhov thib peb feem ntau tsim cov khoom siv hluavtaws polymer hauv ntiaj teb (tom qab polyethylene thiab polypropylene). PVC yog ib zaug uas yog cov khoom siv dav siv dav hauv ntiaj teb thiab tau siv dav. Muaj ob hom PVC: nruj (qee zaum luv li RPVC) thiab mos. Rigid polyvinyl chloride yog siv rau hauv kev tsim cov kav dej, qhov rooj thiab qhov rais. Nws kuj yog siv los ua lub raj mis yas, ntim khoom, lub txhab nyiaj lossis daim npav ua tswv cuab. Ntxiv plasticizers ua rau PVC softer thiab elastic dua. Nws tuaj yeem siv rau hauv cov kav dej, cable rwb thaiv tsev, flooring, signage, phonograph records, inflatable products and rubber substitutes.
stabilizer:
Vim tias PVC resin yog cov khoom kub-rhiab heev, nws pib thermally degrade thaum kub txog li 90 txog 130 ° C, tso tawm HCL tsis ruaj khov thiab ua rau cov resin tig daj. Raws li qhov kub thiab txias, cov xim ntawm cov resin yuav tsaus dua thiab lub cev & tshuaj lom neeg ntawm cov khoom txo qis. Ntxiv nrog rau kev txhim kho cov txheej txheem ntawm cov khoom siv raw, kev daws qhov teeb meem degradation feem ntau yog ntxiv cov stabilizers rau PVC resin kom nqus thiab nruab nrab HCL roj thiab tshem tawm nws cov catalytic degradation nyhuv. Feem ntau siv stabilizing tshuab muaj xws li: lead ntsev, organotin, hlau soaps thiab tsis tshua muaj ntiaj teb stabilizers.
Lubricant (PE ciab los yog Paraffin):
Ib hom additive los txhim kho lubricity thiab txo qhov sib txuas adhesion. Raws li kev ua haujlwm, lawv tau muab faib ua cov roj nplua nyeem sab nraud, cov roj lubricants sab hauv thiab sab hauv & sab nraud lubricants. Lub lubricant sab nraud tuaj yeem txo qhov kev sib txhuam ntawm cov khoom siv thiab cov hlau saum npoo los tiv thaiv cov khoom UPVC los ntawm kev ua raws li lub thoob thiab ntsia hlau tom qab plasticization. Lub lubricant sab hauv tuaj yeem txo qhov kev sib txhuam ntawm cov khoom hauv cov khoom, ua kom tsis muaj zog ntawm cov molecules thiab txo cov yaj viscosity. Kev siv cov roj nplua nyeem muaj qhov cuam tshuam tseem ceeb ntawm kev txo cov ntsia hlau thauj khoom, txo cov cua sov shear, thiab ua kom cov khoom siv extrusion. Kev tsim cov roj nplua nyeem hauv cov formulation yog ib qho tseem ceeb heev.
Filling khoom:
Txhawm rau txhim kho lub hardness thiab rigidity ntawm cov khoom, txo cov khoom deformation, thiab txo cov nqi ntawm cov khoom siv raw, cov fillers xws li CaCO 3 feem ntau ntxiv rau kev tsim cov khoom UPVC.
Kev Hloov Kho Kev Ua Haujlwm (ACR):
Lub hom phiaj tseem ceeb yog txhawm rau txhim kho kev ua haujlwm ntawm cov ntaub ntawv, ua kom cov plasticization ntawm PVC resin, thiab txhim kho fluidity, thermal deformation thiab nto gloss ntawm cov khoom.
Impact modifier:
Lub hom phiaj tseem ceeb yog txhawm rau txhim kho qhov cuam tshuam ntawm cov khoom, txhim kho lub toughness ntawm cov khoom, thiab txhim kho cov nyhuv plasticizing. Feem ntau siv modifiers rau UPVC yog CPE (chlorinated polyethylene) thiab acrylate cuam tshuam kev hloov kho.
Plasticizing mechanism ntawm cov khoom siv yas extrusion thiab kev cuam tshuam ntawm cov khoom xyaw ntawm nws:
Muaj ntau yam khoom siv rau yas extrusion molding. Cov khoom tseem ceeb siv rau extruding UPVC nyuaj khoom yog counter-rotating ntxaib-ntsia hlau extrudersconical ntxaib ntsia hlau extruder. Cov hauv qab no feem ntau tham txog cov txheej txheem plasticization ntawm feem ntau siv extruders rau extruding UPVC khoom.
Counter-rotating conical ntxaib-ntsia hlau extruder:
Post lub sij hawm: Dec-29-2023
