Tlhahisong ea foam ea polyurethane, ho fihlella sebopeho se lakatsehang sa foam, bongata le matla a mechini ho itšetlehile ka lintlha tse ngata - har'a tsona,mocheso oa thepalemocheso o potolohilengke tse peli tsa bohlokoa ka ho fetisisa. Ho utloisisa hore na liparamente tsena tsa mocheso li ama joangkarabelo ea pola ea polyurethanee bohlokoa bakeng sa ho boloka boleng bo tsitsitseng, tlhahiso le ts'ebeliso e ntle ea litšenyehelo.
1. Bohlokoa ba Taolo ea Mocheso ho Polyurethane Foam
TheMokhoa oa ho etsa foam ea polyurethanee kenyelletsa letoto le rarahaneng la diketso tsa dikhemikhale tsa exothermic pakeng tsali-polyol, li-isocyanate, metsi, leli-catalyst tsa polyurethane. Likarabelo tsena li hlahisa mocheso, khase ea CO₂, 'me qetellong li theha sebopeho sa foam ea sele.
Ka bobelimocheso oa thepa(mocheso oa polyol le isocyanate pele li kopanngoa) lemocheso o potolohileng(tikoloho e potolohileng nakong ea ho fofonela le ho folisa) e susumetsa ka kotloloho sekhahla sa karabelo, sebopeho sa sele, ho phahama ha foam, le litšobotsi tsa ho folisa.
2. Phello ea Mocheso oa Thepa Tshebetsong ea Foam
Ho boloka se nepahetsengmocheso oa thepaho bohlokoa pele ho kopanngoa metsoako.
- Mocheso o tlase oa thepa (<18°C): Ha polyol kapa isocyanate e bata haholo, karabelo e ba butle. Foam e ka nyoloha butle, ea bontša lisele tse sa lekanang, kapa ea putlama ka lebaka la karabelo e sa fellang. Lisebelisoa tse batang le tsona li eketsa viscosity, e leng se fellang ka ho tsoakana ho fokolang le sebopeho se sa tloaelehang sa foam.
- Mocheso o phahameng oa thepa (>25°C): Ho futhumatsa ho feta tekano ho potlakisa karabelo ho feta tekano, ho khutsufatsa nako ea tranelate le nako ea ho phahama. Sena se ka lebisa meahong e mebe ea sele, liphoso tsa bokaholimo, le mapetso a khatello ea ka hare ho foam.
Bakeng sa boholo baSistimi ea foam ea polyurethane, e khothaletsoangmocheso oa thepasebaka ke20–25°Cho netefatsa ho kopanya ka ho lekana, sekhahla se setle sa karabelo, le ho phahama ha foam ho tsitsitseng.
3. Tšusumetso ea Mocheso o Tebileng ho Phofoleng le ho Phekoleng
Themocheso o potolohilengsebakeng sa tlhahiso le sona se bapala karolo ea bohlokoa hoBoleng ba foam ea polyurethane.
- Mocheso o tlase oa tikoloho (<15°C): Ho lahleheloa ke mocheso tikolohong ho liehisa karabelo ea foam, ho eketsa linako tsa ho se be le tack le ho tlosa foam. Foam e ka bonahala e le thata ebile e le thata ka lebaka la katoloso e fokotsehileng ea CO₂.
- Mocheso o phahameng oa tikoloho (>30°C): Mocheso o feteletseng o ka baka ho tjhesa ha jell pele ho nako, ho atoloha ho sa fellang, le diphoso tsa disele tse bulehileng. Ditshebedisong tsa foam ya polyurethane e fafatswang (SPF), dithempereichara tse phahameng di ka baka ho kgomarelana ho sa lekanang le botsitso bo fokolang ba dibopeho.
Setalamocheso o pakeng tsa 20–25°Cka mongobo o tlase e netefatsa horekarabelo ea pola ea polyurethanee tsoela pele ka ho lekana le hore foam ea ho qetela e bontša ho teteana ho tsitsitseng le dikahare tsa disele tse kwetsweng.
4. Tekanyo ea Mocheso le Khetho ea Catalyst
Ho feto-fetoha ha mocheso ha ho ame feela lebelo la karabelo ea lik'hemik'hale empa hape ho ama ts'ebetso eapoliethane sethothetsiLi-catalyst tse kang li-amine tse phahameng le metsoako ea organometallic li laola tekano lipakeng tsakarabelo e fokang(metsi–isocyanate) lekarabelo ea gelling(polyol–isocyanate).
Maemong a mocheso o tlase, karabelo e fokotseha, mmesesebelisoa sa amine se sebetsang haholo(joalo kaMXC-A1kapa MXC-5) e ka lefella karabelo e tlase.
Maemong a mocheso o phahameng,sesebediswa sa ho etsa dintho ka tsela e leka-lekaneng kapa e diehileng(joalo kaMXC-B20kapa MXC-TMA) e ka thusa ho boloka ho phahama ho lekanang le ho fokotsa diphoso tsa bokaholimo.
E nepahetsengtaolo ea mocheso e kopantsoeng le sesebelisoa se nepahetseng sa polyurethanee netefatsa thepa e tsitsitseng ea foam esita le tlas'a maemo a fapaneng a tikoloho.
5. Malebela a Sebetsang bakeng sa Taolo ea Mocheso Tlhahisong ea Foam ea PU
- Thepa ea ho futhumatsaho fihlela sebakeng se nepahetseng (20–25°C) pele o kopanya.
- Boloka mocheso o tsitsitseng oa kamoresebakeng se ntshang moholi ka taolo ya tlelaemete kapa ho kenya mocheso o kenang kahare.
- Qoba liphetoho tse potlakileng tsa mochesotse bakang ho se leka-lekane ha foam.
- Liprofaele tsa karabelo ea leihlokhafetsa ho fetola tekanyo ea catalyst ha mocheso oa tikoloho o fapana.
- Netefatsa polokelo e nepahetsengea thepa e tala - haholo-holo li-isocyanate - ho thibela liphetoho tsa ho monngoa ha mongobo le ho teteana.
6. Qetello
Ka bobelimocheso oa thepalemocheso o potolohilengke liparamente tsa bohlokoa tse susumetsangho ntsha bubble ka polyurethaneboleng. Taolo e nepahetseng ea mocheso e netefatsa botsitso ba karabelo ea lik'hemik'hale, e ntlafatsa katleho ea catalyst, 'me e hlahisa lifoam tse nang le boima bo tsitsitseng, sebopeho se tšoanang sa sele, le thepa e phahameng ea mechini.
At Lisebelisoa tse Ncha tsa Mingxu, re fana ka mefuta e fapaneng e felletseng eali-catalyst tsa polyurethanee ntlafalitsoe bakeng sa maemo a fapaneng a mocheso le mekhoa ea foam. Hore na u hlahisafoam e thata, e tenyetsehang, kapa e fafalitsoeng ea polyurethane, dikhataholetsi tsa rona tse se nang mosi, tse nang le monko o tlase di fana ka tshebetso e tshepahalang mme di o thusa ho boloka boleng bo hodimo ba sehlahiswa tlasa tikoloho efe kapa efe ya tlhahiso.
Nako ea poso: Mphalane-15-2025