Chav kawm generic
PVC (Polyvinyl Chloride)
Cov Kev Siv Raug
Cov dej xa hluav taws xob, kav dej hauv tsev, tsev tawm rooj, tsev lag luam tshuab lag luam, ntim khoom hluav taws xob, ntim khoom kho mob, ntim rau khoom noj, thiab lwm yam.
Txhaj Tshuaj Yas Pwm Ua Haujlwm
Kom qhuav | Tsis yog feem ntau tsim nyog xws li PVC nqus cov dej me me heev. |
Qhuav Ntshav | 160 - 220 C (320 - 428 F) |
Pwm Kub | 20 - 70 C (68 - 158 F) |
Khoom Txhaj Muaj Siab | Txog 150 MPa |
Cov Siab Tawv | Mus txog 100 MPa |
Txhaj Ceev | Tus nqi qeeb, kom tsis txhob muaj khoom tawg yooj yim |
Khiav thiab Rooj Vag
Txhua hom rooj vag siv tau los siv; pin-point thiab submarine rooj vag yog siv rau kev txhaj tshuaj molding me me thiab cov rooj vag kiv cua feem ntau yog siv rau ntu tuab. Qhov tsawg kawg nkaus ntawm txoj kab uas hla ntawm tus pin-taw tes lossis submarine rooj vag yuav tsum yog 1 hli thiab qhov tuab ntawm lub qhov rooj ntxuam yuav tsum tsis pub tsawg dua 1 hli.
Sprues yuav tsum luv li sai tau; Qhov khiav qhov ntau thiab tsawg yog 6 - 10 hli thiab yuav tsum muaj qhov chaw ua tiav hla ntu. Insulated tus neeg sib tw kub thiab qee yam ntawm kev kub sib tsoo tawg tau siv nrog PVC.
Tshuaj lom neeg thiab lub cev
Rigid (unplasticised) PVC yog ib qho ntawm feem ntau siv cov ntaub ntawv yas. Nws yog tsim los ntawm sodium chloride thiab ntuj tsim. Cov qauv ua kom rov ua tshuaj yog vinyl chloride. Cov tshuaj ntxiv tau sib xyaw nrog PVC ua kom ua tiav. Cov qib PVC tsim los ntawm kev ncua lossis cov txheej txheem ntau polymerization yog cov hom loj uas siv rau kev ua av. PVC yog cov khoom siv amorphous ntau.
Qee qhov ntxiv rau siv suav nrog stabilizers, roj nplua nyeem, kev tsim cov khoom siv, tshuaj pleev xim, kev hloov pauv cuam tshuam, thiab cov muab tub lim. Qee cov yam ntxwv ntawm PVC suav nrog kev sib txuam tsawg, kev ua kom tawv (tsim kom zoo li tsis muaj kev cuam tshuam), cov ntoo zoo (nrog rau cov xim zoo thiab cuam tshuam, thiab tsis poob hauv cov tawv), thiab zoo heev rau qhov ntev. PVC zoo heev tiv taus oxidizing thiab txo tus neeg sawv cev, thiab muaj zog acids. Txawm li cas los xij, PVC tsis siv neeg tsis tau pom zoo siv rau ib puag ncig thiab siv tas mus li 60 C (140 F). Nws tsis tiv taus cov tshuaj oxidizing acids xws li sulfuric lossis nitric acid thiab tsis haum rau siv nrog muaj ntxhiab thiab chlorinated hydrocarbons.
Nws yog ib qho tseem ceeb heev rau kev ua cov khoom ntawm qhov kub yaj kom raug; txwv tsis pub muaj teeb meem loj los ntawm kev ua kom muaj zog (uas ua rau hydrochloric acid uas nyeg accelerates decomposition) yuav ua tau.
PVC yog cov khoom siv thauj mus los tsawg thiab muaj qhov ua tiav me me. Lub phaus molecular txiav txim siab cov yam ntxwv ntws. Cov khoom siv ua cov khoom hnyav hauv lub cev muaj qhov hnyav dua yog qhov nyuaj rau kev ua haujlwm (qhov no tuaj yeem hloov los ntawm kev ntxiv cov roj av). Feem ntau, txawm li cas los xij, cov qib molecular hnyav tsis tshua siv nyob rau hauv kev txhaj tshuaj molding).
Kev Ntsws qis yog ncaj ncees (0.002 - 0.006 hli / hli lossis 0.2 - 0.6%).
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