litaba

Matsatsing ana, batho ba ela hloko tšireletso ea carbon e tlaase le ea tikoloho, kahoo ha ba khabisa, batho ba bangata ba tla khetha liaparo tse ling tse sireletsang tikoloho.Kajeno re bua haholo-holo ka liphahlo tse thibelang metsi tse sireletsang tikoloho.Liaparo tse sa keneleng metsi li arotsoe haholo-holo ka mefuta e 'meli ea liphahlo: liphahlo tse qhibilihang ka metsing (liaparo tse thehiloeng metsing) le litlolo tse thehiloeng ho solvent.Joale phapang ke efe pakeng tsa liphahlo tse peli tse sa keneleng metsi?

Phapang pakeng tsa liphahlo tse entsoeng ka metsi le li-solvents tse thehiloeng ho li-solvents li ka boleloa ho latela maikutlo a latelang:

A. Liphapang tsa mekhoa ea ho roala

1. Resin e fapane.Resin ea pente e entsoeng ka metsi e qhibiliha ka metsing 'me e ka qhalakanngoa (e qhibiliha) ka metsing;

2. The diluent (solvent) e fapane.Lipente tse thehiloeng metsing li ka hlapolloa ka DIWater (metsi a deionized) ka tekanyo leha e le efe, ha lipente tse thehiloeng ho solvent li ka hlapolloa feela ka metsoako ea tlhaho (parafini e sa nkheng, oli e tšoeu e khanyang, joalo-joalo).

B. Litlhoko tse fapaneng tsa kaho ea ho roala

1. Bakeng sa tikoloho ea kaho, ntlha ea leqhoa ea metsi ke 0 ° C, kahoo liphahlo tse thehiloeng metsing li ke ke tsa sebelisoa ka tlase ho 5 ° C, ha liphahlo tse thehiloeng ho solvent li ka sebelisoa ka holimo ho -5 ° C, empa lebelo la ho omisa le tla lieha. tlase mme sebaka se pakeng tsa dipina se tla lelefatswa;

2. Bakeng sa viscosity ea kaho, phello ea ho fokotsa li-viscosity ea metsi e futsanehile, 'me pente e thehiloeng metsing e tla ba e khathatsang ha e hlapolloa le ho fokotseha ka viscosity (ho fokotseha ha viscosity ho tla fokotsa haholo lintho tse tiileng tsa mokelikeli o sebetsang oa pente, ama matla a koahelang pente, 'me a eketse palo ea lipalangoang tsa kaho), phetoho ea viscosity e thehiloeng ho Solvent e bonolo haholoanyane, le moeli oa viscosity o tla ama khetho ea mokhoa oa kaho;

3. Bakeng sa ho omisa le ho folisa, pente e entsoeng ka metsi e thata haholoanyane, mongobo o phahame 'me mocheso o tlaase, o ke ke oa phekoloa hantle,' me nako ea ho omisa e lelefalitsoe, empa haeba mocheso o futhumala, metsi a thehiloeng ke metsi. pente e boetse e hloka ho futhumatsoa ka har'a gradient, 'me e tla kena tikolohong ea mocheso o phahameng hang-hang.Ka mor'a hore pente e thehiloeng holim'a metsi e ome Ho phalla ha mouoane o ka hare oa metsi ho ka baka likoti kapa esita le ho phatloha ho hoholo, hobane metsi feela a sebelisoa e le mokelikeli penteng ea metsi, 'me ha ho na sekhahla sa volatilization.Bakeng sa lirafshoa tse thehiloeng ho solvent, diluent e entsoe ka metsoako ea tlhaho e nang le lintlha tse fapaneng tse belang, 'me ho na le li-gradients tse ngata tsa volatilization.Lintho tse ts'oanang li ke ke tsa etsahala ka mor'a ho benya (nako ea ho omisa ka mor'a hore mohaho o phethoe ho fihlela nako ea ho omisa pele o kena ka ontong).

C. Phapang ea ho roala mokhabiso ka mor'a ho thehoa ha filimi

C-1.Phapang e fapaneng ea khanya

1. Liaparo tse entsoeng ka solvent li ka laola botle ba li-pigment le li-filler ho ea ka ho sila, 'me ha ho bonolo ho teteaneng nakong ea polokelo.Ka ho eketsa li-resin ho laola PVC ea ho roala (pigment-to-base ratio), li-additives (tse kang li-matting agents) ho finyella liphetoho ho khanyeng ea filimi ea ho roala, Gloss e ka ba matte, matte, semi-matte, le e phahameng- kganya.Ho benya ha pente ea koloi ho ka ba holimo ho 90% kapa ho feta;

2. Ponahatso e khanyang ea lipente tse entsoeng ka metsi ha e na bophara joaloka lipente tse entsoeng ka oli, 'me ponahalo e khanyang e phahameng e futsanehile.Lebaka ke hobane metsi a penteng ea metsi a sebelisoa e le mokelikeli.Litšobotsi tsa ho feto-fetoha ha metsi li etsa hore ho be thata ho lipente tse thehiloeng metsing ho

hlahisa ho feta 85% khanya e phahameng..

C-2.Tlhaloso ea mebala e fapaneng

1. Liaparo tse entsoeng ka solvent li na le mefuta e mengata ea li-pigment le li-filler, ebang ke inorganic kapa organic, kahoo mebala e sa tšoaneng e ka fetoloa, 'me ponahalo ea mebala e ntle haholo;

2. Mefuta e khethiloeng ea li-pigment le li-filler bakeng sa lipente tse thehiloeng metsing li nyenyane, 'me boholo ba li-pigment tsa tlhaho li ke ke tsa sebelisoa.Ka lebaka la molumo oa 'mala o sa fellang, ho thata ho fetola mebala e ruileng joaloka lipente tse thehiloeng ho solvent.

D. Polokelo le Lipalangoang

Lipente tse thehiloeng metsing ha li na lihlapolli tse tukang, 'me li batla li sireletsehile ho li boloka le ho li tsamaisa.Haeba ho na le tšilafalo, li ka hlatsuoa le ho hlapolloa ka metsi a mangata.Leha ho le joalo, lipente tse thehiloeng metsing li na le litlhoko tsa mocheso bakeng sa polokelo le lipalangoang.Lebese le mafu a mang.

E. Phetoho ea Mosebetsi

Liaparo tse thehiloeng ho solvent hangata ke lihlahisoa tsa tlhaho, 'me lihlahisoa tsa manyolo li tla ba le letoto la mathata a kang chain scission le carbonization tlas'a maemo a phahameng a mocheso.Hajoale, mocheso o phahameng oa ho hanyetsa lihlahisoa tsa manyolo ha o fete 400 ° C.

Liaparo tse khethehileng tse hanyetsanang le mocheso o phahameng ka ho sebelisa li-resin tse khethehileng tsa inorganic tse entsoeng ka metsi li ka mamella mocheso oa likhato tse likete.Ka mohlala, lihlahisoa tsa ZS tse nang le mocheso o phahameng oa mocheso o thibelang mocheso oa metsi ha o nahane feela ka thepa e khahlanong le kutu le e khahlanong le oxidation ea liaparo tse tloaelehileng, empa hape le nako e telele ea ho hanyetsa mocheso o phahameng, ho fihlela ho 3000 ℃ mocheso o phahameng, e leng ha ho khonehe bakeng sa litlolo tse thehiloeng ho solvent.

G. Liphapang tsa polokeho le tshireletso ya tikoloho

Liaparo tse thehiloeng ho solvent li na le likotsi tse ka bang teng tsa polokeho ea mollo le ho phatloha nakong ea tlhahiso, lipalangoang, polokelo le tšebeliso.Haholo-holo libakeng tse koaletsoeng, ho na le monyetla oa ho baka ho bipetsana le ho phatloha.Ka nako e ts'oanang, metsoako ea organic le eona e tla baka tšenyo e itseng 'meleng oa motho.Nyeoe e tsebahalang haholo ke taba ea toluene e bakang mofetše, 'me toluene ha e sa lumelloa ho sebelisoa.VOC ea litlolo tse thehiloeng ho solvent li phahame, 'me lihlahisoa tse tloaelehileng li bile li phahame ho feta 400. Likhoebo li tlas'a khatello e kholo ea tšireletso ea tikoloho le polokeho ha li hlahisa le ho sebelisa liphahlo tse thehiloeng ho solvent.

Liaparo tse entsoeng ka metsi li sireletsa tikoloho 'me li bolokehile tlhahisong, lipalangong, polokelong le tšebelisong (ntle le liphahlo tse entsoeng ka metsi tse tsoang ho bahlahisi ba bang ba sa reroang).

Qetello:

Liaparo tse entsoeng ka metsi le li-solvents li na le melemo le melemo ea tsona.Hobane lipatlisiso tsa liphahlo tse entsoeng ka metsi li ntse li e-s'o ka li hōla, ts'ebetso ea liphahlo tse entsoeng ka metsi e ke ke ea finyella ka botlalo litlhoko tsa tlhahiso ea sechaba.Ho sebelisoa ha litlolo tse thehiloeng ho solvent ho ntse ho hlokahala.Boemo ba sebele bo hlahlojoa le ho ahloloa, 'me bo ke ke ba haneloa ka lebaka la bofokoli bo itseng ba mofuta o itseng oa pente.Ho lumeloa hore ka ho teba ha lipatlisiso tsa saense mabapi le liphahlo tse entsoeng ka metsi, ka letsatsi le leng, liphahlo tse ncha tse se nang tikoloho le tse sireletsehileng li tla sebelisoa haholo likarolong tsohle tsa lefatše.