Valashi
TANTHAUZO
Malo opyapyala, olimba, onyezimira, osasungunuka ndi mafuta, opangidwa makamaka ndi zotsalira za organic, ndipo amadziŵika bwino kwambiri ndi kukula kwa mtundu.Simachotsedwa mosavuta popukuta ndi zopukuta zoyera, zowuma, zofewa, zopanda lint ndipo zimagonjetsedwa ndi zosungunulira zodzaza.Mtundu wake ukhoza kukhala wosiyana, koma nthawi zambiri umawoneka mu imvi, bulauni kapena amber hues.Chitsime: ASTM D7843-18
KODI VARNISH AMAPHUNZITSIDWA BWANJI
Nthawi zambiri, mafuta amawonongeka chifukwa cha kupsinjika kwamankhwala, kutentha, makina omwe amafulumizitsa momwe ma oxidation amafuta amagwirira ntchito ndipo mapangidwe a varnish amayamba ndi okosijeni.
- Chemical:Zinthu zambiri zamafuta zimachitika m'zaka zamafuta.Kuchuluka kwa okosijeni wamafuta kumabweretsa zinthu zambiri zowola, kuphatikiza ma insoluble particulates ndi ma acid.Kutentha komanso kupezeka kwazinthu zachitsulo (Iron, Copper) kumathandizira ntchitoyi.Kuphatikiza apo, mafuta omwe ali ndi mpweya wambiri amakhala okhudzidwa kwambiri ndi Oxidation.
- Kutentha:Pamene thovu la mpweya lilowetsedwa mu mafuta, kulephera kwakukulu kwa mafuta kungabwere chifukwa cha mikhalidwe yotchedwa PID (Pressure-induced Dieseling) Kapena PTG (Pressure-induced Thermal Degradation).Kutentha komwe kumakhalako kumapitilira 538 ℃ pomwe thovu la mpweya limagwa chifukwa cha kuthamanga kwambiri, zomwe zimabweretsanso kuwonongeka kwamafuta.
-Makanika:"Kumeta" kumachitika pamene mamolekyu amafuta amang'ambika pamene akuyenda pakati pa malo osuntha.
Polymerization imachitika pamene zinthu zotulutsa okosijeni & zochita zowonjezera zimaphatikizana ndikupanga mamolekyu amtali wautali okhala ndi mamolekyu apamwamba kwambiri.Mamolekyu awa ndi polarized.Mlingo wa maselo polymerization zimadalira kutentha ndi ndende ya ndi mankhwala makutidwe ndi okosijeni.
Imawonetsa kuthekera kosungunula mamolekyu mkati mwa yankho lomwe limakhudzidwa mwachindunji ndi kutentha.Pamene zinthu zopangidwa ndi okosijeni zimapangidwira mosalekeza, madzimadzi amakhala pafupi ndi malo odzaza.
Njira yomwe imayambitsa kuyika kwa tinthu tating'onoting'ono imasinthidwa.Nthawi zambiri, varnish ikapangidwa, imatha kulowetsedwanso mumadzimadzi ndikusweka ngati kusungunuka kwa mafuta kumawonjezeka.
Madzimadzimadzi sangathe kusungunula mamolekyu atsopano opangidwa ndi ma polima akafika pamalo ozizira kapena madzimadzi amadutsa malo ozizira (Kusungunuka kumachepetsa kutentha kutsika).Popeza kuti zinthu zina za okosijeni sizingathe kusungidwa, zimatuluka ndi kupanga tinthu ting'onoting'ono tofewa (sludge/varnish).
The insoluble zofewa particles n'zosavuta agglomerate mzake ndi kupanga zikuluzikulu polarized particles ndi apamwamba maselo kulemera.
Zitsulo ndi polar kuposa particles izi polarized kotero kuti mosavuta kudziunjikira pamwamba zitsulo (ozizira madera, chabwino chilolezo, otsika otaya) kumene wosanjikiza yomata(Varnish) aumbike ndi kukopa particles zambiri kutsatira izo.Umu ndi momwe varnish inapangidwira
Mafuta a Varnish
◆Kumanga ndi kulanda mavavu
◆Kutenthedwa mayendedwe
◆Kuchepetsa mphamvu zosinthira kutentha
◆Kuwonjezeka kwa kuvala pazigawo zofunika kwambiri ndi ma valve
◆Kufupikitsa moyo wa Makina, mafuta, zosefera ndi zosindikizira
NJIRA YOPEZERA VARNISH
Chifukwa cha kukwera mtengo kwa kupezeka kwa varnish, muyenera kuyang'anira momwe varnish ingathere mu makina anu opaka mafuta.Ambiri anatengera njira ndiMembrane Patch Colorimetry(MPC ASTM7843).Njira yoyeserayi imatulutsa zonyansa zosasungunuka kuchokera ku zitsanzo zamafuta a turbine omwe akugwira ntchito pachigamba (chokhala ndi nembanemba ya 0.45µm) ndipo mtundu wa chigamba cha nembanemba umawunikidwa ndi spectrophotometer.Zotsatira zimanenedwa ngati mtengo wa ΔE.
ZOTHANDIZA ZA KUCHOTSA VARNISH
| Chitsanzo | Varnish yosungunuka | Insoluble Varnish | Madzi |
|---|---|---|---|
| WVDJ | √ | √ | √ |
| WVD-II | √ | √ | |
| WJD | √ | ||
| WJL | √ |