Kenyelletso ea sesebelisoa sa foaming bakeng sa foam e thata ea polyurethane e sebelisoang tšimong ea kaho
Ka litlhoko tse ntseng li eketseha tsa meaho ea sejoale-joale bakeng sa ho boloka matla le ts'ireletso ea tikoloho, ts'ebetso ea ho kenya mocheso oa thepa ea moaho e ba ea bohlokoa le ho feta. Har'a tsona, foam e thata ea polyurethane ke sesebelisoa se setle sa ho futhumatsa mocheso, se nang le thepa e ntle ea mochini, conductivity e tlase ea mocheso le melemo e meng, ka hona e sebelisoa haholo tšimong ea ho koala moaho.
Moemeli oa ho foaming ke e 'ngoe ea li-additives tse ka sehloohong tlhahisong ea foam e thata ea polyurethane. Ho ea ka mokhoa oa eona oa ts'ebetso, e ka aroloa ka mekhahlelo e 'meli: lik'hemik'hale tse foaming tsa lik'hemik'hale le moemeli oa' mele oa ho foaming.
Khethollo ea li-agent tsa foam
Moemeli oa foam oa lik'hemik'hale ke kenyelletso e hlahisang lisebelisoa tsa khase le foam polyurethane nakong ea karabelo ea isocyanates le polyols. Metsi ke moemeli oa mokelikeli oa foam oa lik'hemik'hale, o sebetsanang le karolo ea isocyanate ho etsa khase ea carbon dioxide, e le ho foam le thepa ea polyurethane. Moemeli oa 'mele oa ho foaming ke tlatsetso e kenyellelitsoeng ts'ebetsong ea tlhahiso ea foam e thata ea polyurethane, e phophomang thepa ea polyurethane ka ketso ea khase. Metsoako ea foam ea 'mele ke metsoako ea lintho tse phelang tse belang hanyane, joalo ka metsoako ea hydrofluorocarbon (HFC) kapa alkane (HC).
Mokhoa oa ntlafatso eamoemedi wa foame qalile ho elella bofelong ba lilemo tsa bo-1950, k'hamphani ea DuPont e sebelisitse trichloro-fluoromethane (CFC-11) e le sesebelisoa sa polyurethane foam foaming, 'me ea fumana ts'ebetso e ntle ea sehlahisoa, ho tloha ka nako eo CFC-11 esale e sebelisoa haholo tšimong ea foam e thata ea polyurethane. Ha CFC-11 e ipakile e senya lera la ozone, linaha tsa Europe Bophirimela li ile tsa khaotsa ho sebelisa CFC-11 bofelong ba 1994, ’me Chaena le eona e ile ea thibela tlhahiso le tšebeliso ea CFC-11 ka 2007. Ka mor’a moo, United States le Europe li ile tsa thibela tšebeliso eo. ea sebaka sa CFC-11 HCFC-141b ka 2003 le 2004, ka ho latellana. Ha tlhokomeliso ea tikoloho e ntse e eketseha, linaha li qala ho hlahisa le ho sebelisa mekhoa e meng e nang le menyetla e tlaase ea ho futhumala ha lefatše (GWP).
Baemeli ba foam ba mofuta oa Hfc e kile ea e-ba ba nkang sebaka sa CFC-11 le HCFC-141b, empa boleng ba GWP ba metsoako ea mofuta oa HFC bo ntse bo le holimo, bo sa lokeleng tšireletso ea tikoloho. Ka hona, lilemong tsa morao tjena, sepheo sa nts'etsopele ea mahlahana a foam lefapheng la kaho e fetohile mekhoa e meng e tlaase ea GWP.
Melemo le boiketlo ba li-agent tsa foam
Joalo ka mofuta oa thepa ea ho kenya letsoho, foam e thata ea polyurethane e na le melemo e mengata, joalo ka ts'ebetso e ntle ea ho kenya mocheso, matla a matle a mochini, ts'ebetso e ntle ea ho monya molumo, bophelo bo tsitsitseng ba nako e telele, joalo-joalo.
Joaloka motlatsi oa bohlokoa ho lokiseng foam e thata ea polyurethane, moemeli oa foaming o na le tšusumetso ea bohlokoa ts'ebetsong, litšenyehelo le ts'ireletso ea tikoloho ea thepa ea ho pata mocheso. Melemo ea lik'hemik'hale tse foaming tsa lik'hemik'hale ke lebelo le phophomang ka potlako, ho foamisa ka mokhoa o ts'oanang, ho ka sebelisoa ka mefuta e mengata ea mocheso le mongobo, ho ka fumana sekhahla se phahameng sa foam, e le ho lokisa foam e thata ea polyurethane e sebetsang hantle.
Leha ho le joalo, metsoako ea foam ea lik’hemik’hale e ka hlahisa likhase tse kotsi, tse kang carbon dioxide, carbon monoxide le nitrogen oxides, tse bakang tšilafalo tikolohong. Molemo oa sesebelisoa sa foam ke hore ha e hlahise likhase tse kotsi, ha e na tšusumetso e fokolang tikolohong, hape e ka fumana boholo bo fokolang ba bubble le ts'ebetso e ntle ea ho kenya letsoho. Leha ho le joalo, lisebelisoa tsa foam tsa 'mele li na le sekhahla se batlang se le butle sa ho phophoma 'me se hloka mocheso o phahameng le mongobo ho sebetsa ka hohle kamoo li ka khonang.
Joalo ka mofuta oa thepa ea ho kenya letsoho, foam e thata ea polyurethane e na le melemo e mengata, joalo ka ts'ebetso e ntle ea ho kenya mocheso, matla a matle a mochini, ts'ebetso e ntle ea ho monya molumo, bophelo bo tsitsitseng ba nako e telele, joalo-joalo.
E le motlatsi oa bohlokoa tokisetsong eafoam e thata ea polyurethane, moemeli oa foaming o na le tšusumetso ea bohlokoa ts'ebetsong, litšenyehelo le ts'ireletso ea tikoloho ea thepa ea ho pata mocheso. Melemo ea lik'hemik'hale tse foaming tsa lik'hemik'hale ke lebelo le phophomang ka potlako, ho foamisa ka mokhoa o ts'oanang, ho ka sebelisoa ka mefuta e mengata ea mocheso le mongobo, ho ka fumana sekhahla se phahameng sa foam, e le ho lokisa foam e thata ea polyurethane e sebetsang hantle.
Leha ho le joalo, metsoako ea foam ea lik’hemik’hale e ka hlahisa likhase tse kotsi, tse kang carbon dioxide, carbon monoxide le nitrogen oxides, tse bakang tšilafalo tikolohong. Molemo oa sesebelisoa sa foam ke hore ha e hlahise likhase tse kotsi, ha e na tšusumetso e fokolang tikolohong, hape e ka fumana boholo bo fokolang ba bubble le ts'ebetso e ntle ea ho kenya letsoho. Leha ho le joalo, lisebelisoa tsa foam tsa 'mele li na le sekhahla se batlang se le butle sa ho phophoma 'me se hloka mocheso o phahameng le mongobo ho sebetsa ka hohle kamoo li ka khonang.
Mokhoa oa nts'etsopele ea nako e tlang
Tloaelo ea li-agent tse phunyang maeba indastering ea meaho ea nako e tlang haholo-holo e lebisitse ho nts'etsopele ea libaka tse tlase tsa GWP. Ka mohlala, CO2, HFO, le mefuta e meng ea metsi, e nang le GWP e tlaase, zero ODP, le ts'ebetso e 'ngoe ea tikoloho, li sebelisitsoe haholo ho hlahisa foam e thata ea polyurethane. Ntle le moo, ha theknoloji ea thepa ea moaho e ntse e tsoela pele ho nts'etsapele, mochini o phophomang o tla tsoela pele ho nts'etsapele ts'ebetso e ntle haholo, joalo ka ts'ebetso e ntle ea ho kenya letsoho, sekhahla se phahameng sa ho foka, le boholo bo nyane ba bubble.
Lilemong tsa morao tjena, likhoebo tsa lik'hemik'hale tsa organofluorine tsa malapeng le tsa kantle li ntse li batla le ho nts'etsapele lisebelisoa tse ncha tse nang le fluorine, ho kenyeletsoa le li-fluorinated olefins (HFO) tse bitsoang li-foaming agents tsa moloko oa bone mme e le sesebelisoa se phophomang 'mele se nang le khase e ntle. phase thermal conductivity le melemo ea tikoloho.
Nako ea poso: Jun-21-2024