Polyvinyl chloride yog ib qho ntawm tsib lub yas loj hauv ntiaj teb. Vim nws cov nqi tsim khoom qis dua piv rau polyethylene thiab qee cov hlau, thiab nws cov kev ua tau zoo heev thiab cov khoom siv lub cev thiab tshuaj ntawm cov khoom, nws tuaj yeem ua tau raws li qhov xav tau ntawm kev npaj cov khoom tawv rau mos, elastic, fiber, txheej thiab lwm yam khoom, thiab siv dav hauv ntau qhov chaw xws li kev lag luam, kev ua liaj ua teb, thiab kev tsim kho. Yuav ua li cas rov ua dua tshiab thiab siv cov pov tseg polyvinyl chloride yog qhov tseem ceeb heev.
1. Kev tsim dua tshiab
Ua ntej, kev rov ua dua tshiab ncaj qha tuaj yeem ua tau. Kev rov ua dua tshiab ncaj qha ntawm cov yas pov tseg yog hais txog kev ua thiab molding ncaj qha ntawm cov yas pov tseg los ntawm kev ntxuav, tsoo, thiab yas tsis tas yuav hloov kho ntau yam, lossis kev ua thiab molding ntawm cov khoom los ntawm kev granulation. Tsis tas li ntawd, nws kuj tuaj yeem hloov kho thiab rov ua dua tshiab. Kev hloov kho thiab kev rov ua dua tshiab ntawm cov yas qub yog hais txog kev hloov kho lub cev thiab tshuaj lom neeg ntawm cov yas rov ua dua tshiab ua ntej ua thiab tsim. Kev hloov kho tuaj yeem muab faib ua kev hloov kho lub cev thiab kev hloov kho tshuaj lom neeg. Kev sau, fiber sib xyaw, thiab kev sib xyaw toughening yog txoj hauv kev tseem ceeb ntawm kev hloov kho lub cev ntawm PVC. Kev hloov kho sau yog hais txog txoj kev hloov kho ntawm kev sib xyaw cov khoom sib xyaw nrog cov modulus siab dua hauv polymers. Kev hloov kho fiber sib xyaw txhawb nqa yog hais txog txoj kev hloov kho ntawm kev ntxiv cov modulus siab thiab cov fibers muaj zog siab lossis cov khoom cuav rau hauv polymer, yog li txhim kho cov khoom siv kho tshuab ntawm cov khoom. Kev hloov kho tshuaj lom neeg ntawm PVC yog ua tiav los ntawm kev hloov kho cov qauv ntawm PVC los ntawm qee yam tshuaj lom neeg.
2. Tshem tawm thiab siv cov hydrogen chloride
PVC muaj li ntawm 59% chlorine. Tsis zoo li lwm cov pa roj carbon polymers, cov ceg ntawm PVC tawg ua ntej cov saw hlau tseem ceeb thaum lub sijhawm tawg, tsim cov roj hydrogen chloride ntau, uas yuav ua rau cov khoom siv xeb, lom Catalyst lom, thiab cuam tshuam rau qhov zoo ntawm cov khoom tawg. Yog li ntawd, kev kho mob hydrogen chloride tshem tawm yuav tsum tau ua thaum lub sijhawm tawg PVC.
3. Hlawv PVC los siv cua sov thiab roj chlorine
Rau cov yas pov tseg uas muaj PVC, qhov tshwj xeeb ntawm kev tsim cua sov siab feem ntau yog siv los sib tov nrog ntau yam khib nyiab uas kub hnyiab thiab tsim cov roj khov nrog cov khoom me me sib npaug. Qhov no tsis yog tsuas yog pab txhawb kev khaws cia thiab kev thauj mus los, tab sis kuj hloov cov roj siv hauv cov boilers hlawv thee thiab cov kilns kev lag luam, thiab dilutes chlorine los txhim kho kev ua haujlwm thermal.
Lub sijhawm tshaj tawm: Lub Xya Hli-21-2023
