K'hemistring ea polymer, li-polyol tse khethehileng li sebetsa e le li-design tsa bohlokoa. Lihlopha tsa Hydroxyl li arabela ka li-isocyanate ho theha likhokahano tse matla tsa urethane. MOFAN e hlahisa letoto la polyether la tekheniki le li-polyethylene glycols tse phahameng (PEG) bakeng sa litsamaiso tsa indasteri. Baenjiniere ba lik'hemik'hale ba sebelisa likarolo tsena ho kenya mocheso o thata, foam e tenyetsehang le li-polyurethane elastomers.

Kgolo ena e bonts'a sekala sa moruo sa li-polyol ho pholletsa le tlhahiso ea indasteri.

Lintlha tsa Bohlokoa

• Li-polyol tse khethehilengtheha likhokahano tse matla tsa urethane le li-isocyanate ho etsa li-polyurethane tse sebetsang hantle.
• Li-polyol tsa polyether li hanela tšenyo ea metsi hamolemo ho feta li-polyester polyols libakeng tse metsi.
• Li-polyol tse sebetsang hantle li eketsa bongata ba li-crosslink ho eketsa boima ba thepa le ho hanyetsa mocheso.
• Diol tse boima bo phahameng ba limolek'hule li fokotsa palo ea urethane ho boloka li-sealant li tenyetseha mochesong o ka tlase ho lefela.
• Li-polyol tse nkhang hamonate li fana ka khanyetso e matla ea mocheso le ho lieha ha malakabe bakeng sa liphanele tse thata tsa ho thibela mocheso.
• Li-glycol tse hloekileng tsa polyethylene li fana ka setlolo se boreleli le taolo e thibelang ho fetoha ha mocheso ho pholletsa le liindasteri tse fapaneng tsa ts'ebetso.
• Maemo a tlase a potasiamo linthong tse tala a thibela lik'hemik'hale tse sa batleheng nakong ea tlhahiso ea fektheri.

Ho Utloisisa Li-Polyol tse Ikhethang K'hemistri ea Liindasteri

Sebopeho sa Lik'hemik'hale sa Polyether le PEG Polymers

Moralo oa litsebi tsa k'hemistri ea polymerli-polyol tse khethehilengho haha ​​thepa e tšepahalang le e tšoarellang. Moralo oa limolek'hule o itšetlehile ka ho pheta-pheta likhokahano tsa ether tse fanang ka mamello ea ho tenyetseha le matla a matla. Li-initiator tse arabelang ka li-ether tse potolohang li hlahisa liketane tse fapaneng tse etselitsoeng mekhoa ea indasteri.

Ho kgetha pakeng tsa polyols tsa polyether le polyols tsa polyester ho fetola khanyetso ya mokokotlo haholo. Meaho ya polyether e fana ka khanyetso e phahameng ho karohano ya hydrolytic maemong a mongobo. Ka lehlakoreng le leng, dikgokelo tsa ester ho polyester polyols di fana ka khanyetso e phahameng ya ho kgohlahala ha mechine. MOFAN e fana ka polyols tsa tshebetso tse leka-lekanyang mamello ya dikhemikhale le boitshwaro bo nepahetseng ba ho sebetsana.

Karolo ea Li-Polyol Mekhoeng ea Polyurethane

Ho kopanngoa ha polyurethane e sebetsang hantle ho itshetlehile ka ho eketsoa ha stoichiometric ha dihlopha tse sebetsang tsa hydroxyl ho metswako e sebetsang e arabelang. Karabelo ya mantlha e etsahala ha sehlopha sa terminal sa hydroxyl se kopana le molek'hule ya isocyanate. Mohato ona o theha kgokelo e matla ya urethane hodima ketane ya polymer e ntseng e hola.

sehlopha sa hydroxyl + isocyanate -> khokahano ea urethane

Metswako ya di-formula e kopanya di-polyol tse fapaneng le mefuta e itseng ya isocyanate ho laola bongata ba foam, ho thatafala ha polymer, le ho hanyetsa mocheso. Metswako ya resin e metsi e hloka sekgahla se leka-lekaneng sa karabelo ya kinetic ho thibela ho fetoha ha gelling pele ho nako nakong ya tshebetso. Ho eketsa di-additives tse kopanyang ho potlakisa kemiso ya phekolo mme ho ntlafatsa ho tiya ha ho qetela. MOFAN e fana ka dikereiti tse ikgethang tsa botekgeniki tse netefatsang tshebetso e tsitsitseng ho pholletsa le disebediswa tsa tlhahiso tse iketsang.

Lihlopha tse Sebetsang ka Boima ba Limolek'hule le Palo ea Hydroxyl

Boleng ba Hydroxyl bo laola bongata ba ho hokahanya le thepa ea 'mele ea marangrang a thermoset a folisitsoeng. Lisebelisoa tse tlase tsa boima ba limolek'hule li na le linomoro tse phahameng tsa hydroxyl, li etsa likarolo tse thata tsa polymer tse nang le bongata bo tiileng ba li-crosslink. Li-diols tse phahameng tsa boima ba limolek'hule li na le linomoro tse tlase tsa hydroxyl, tse hlahisang likarolo tse bonolo tsa elastomeric tse loketseng li-sealant.

Ho kgetha dinomoro tse loketseng tsa hydroxyl ho dumella baenjiniere ho iketsetsa ho tenyetseha ha mechini le boitshwaro ba ho kganna ka nepo. Boima bo phahameng ba dimolek'hule bo fokotsa mahloriso a sehlopha sa urethane ka kakaretso ka hara matrix. Boima bo tlase ba dimolek'hule bo eketsa dikarolwana tse thata, bo eketsa kganyetso ya mocheso le bokgoni ba ho hatella mojaro. MOFAN e hlahisa di-polyol tsa tekheniki ho pholletsa le boima bo boholo ba dimolek'hule ho fihlela ditlhoko tse matla tsa tlhahiso ya diindasteri.

Mefuta ea Bohlokoa le Litšobotsi tsa 'Mele tsa Li-formulations tsa Polyether

Li-polyol tse khethehileng li fana ka boits'oaro bo ikhethileng ba ts'ebetso le bophelo ba ts'ebeletso bo tšoarellang lits'ebetsong tsa lik'hemik'hale tsa indasteri.Polyols tsa polyetherLi na le likhokahano tsa oksijene liketane tsa tsona tsa limolek'hule. Likhokahano tsena tsa ether li fana ka botsitso bo botle ba hydrolytic libakeng tsa ts'ebetso e metsi. Baenjiniere ba lik'hemik'hale hangata ba bapisa litsamaiso tsena le polyester polyols. Leha polyester polyols e fana ka matla a 'mele a matla, polyester polyols ha e na botsitso bo lekanang ba hydrolytic. Polyester polyols e senyeha kapele ha e pepesehetse mongobo o sa khaotseng. MOFAN e rala mekhoa e khethehileng ho sireletsa likarolo tse matla khahlanong le ho senyeha ha metsi le ho pepesehela lik'hemik'hale ka matla.

Li-Crosslink tse sebetsang hantle le li-Diol tsa Sebopeho

Dibopeho tsa polymer di itshetlehile ka moralo wa pele wa dimolek'hule ho fihlella dibopeho tse ikgethang tsa mechine. Di-crosslink tse sebetsang hantle di haha ​​marangrang a teteaneng a mahlakore a mararo, ha di-diol tsa sebopeho di bopa diketane tse atolositsweng tsa polymer.

Matlafatso a Kutloano le Mechine

Li-crosslink tse sebetsang hantle li eketsa palo ea libaka tsa hydroxyl tse arabelang ka molek'hule ka 'ngoe. Ts'ebetso ea hydroxyl pakeng tsa 2.0 le 4.0 e eketsa bongata ba li-crosslink nakong ea polymerization. Bongata bo phahameng ba li-crosslink bo ntlafatsa ka ho toba matla a kopaneng, boima ba 'mele, le thepa ea mechini ka kakaretso. MOFAN e fana ka PF-040, PF-450, le PF-1050 ho ntlafatsa bonngoe ba matrix. Lisebelisoa tsena li eketsa ho hanyetsa mocheso ka har'a likhomaretsi tsa likarolo tse peli, li-castings tsa sebopeho le liphahlo tse sireletsang fatše.

Diol tsa Bolelele bo Holimo bakeng sa Mekhoa ea Modulus e Tlase

Ditshebediso tsa modulus e tlase di hloka di-polymer tse otlolohileng tse nang le boima bo phahameng ba dimolek'hule. Di-diol tse boima bo phahameng ba dimolek'hule tse kang MOFAN PF-2080 le PF-2120 di fana ka ho tenyetseha ho makatsang le ho lelefala ho hoholo. Di-diol tsena tsa sebopeho di fokotsa mahloriso a kakaretso a urethane mokokotlong wa polymer. Palo e tlase ya dihlopha tsa urethane e hlahisa dikarolo tse bonolo tse bolokang ho tenyetseha ho tlase ho fihlela ho -60°C. Bahlahisi ba di-diol ba sebedisa di-diol tsena tse otlolohileng ho etsa di-sealant tse kopaneng le di-elastomer tse matla tsa polyurethane.

Li-Openers tsa Sele, Hydrophilic, le High-Reactivity Grades

Mekhahlelo ea litlatsetso tse khethehileng e fetola meaho ea lisele tsa foam tsa ka hare le kinetics ea karabelo ea bokaholimo. Ts'ebetso, boleng ba hydroxyl, le viscosity li sebetsa e le litekanyo tsa mantlha tsa ho arola li-polyol tsena tse ikhethileng.

Sehlopha sa ho bula sele sa PF-3500 se thibela ho fokotseha ha pneumatic ka har'a foam e tenyetsehang e tlase. Sehlopha sa hydrophilic sa PF-010 se na le lihlopha tse sebetsang tsa hydroxyl tse sebetsang hantle ka har'a li-hydrogel tse ruruhang ka metsi. Sehlopha sa PF-2802 se nang le reactivity e phahameng se eketsa matla a ho taboha ka har'a lieta tse bōpiloeng. Li-polyol tsena tse khethehileng li boloka thepa e tsitsitseng ea 'mele nakong ea potoloho ea tlhahiso e potlakileng.

Polyols e nkhang hamonate le e monate bakeng sa ho thibela malakabe

Ho thibela mocheso ho thata ho hloka lebelo le potlakileng la ts'ebetso, matla a matla a sebopeho, le mamello e matla ea mollo. Li-polyol tse nang le monko o monate le novolac li kenyelletsa masale a monko o monate ka har'a ketane e kholo ea polymer. Lihlahisoa tse kang MOFAN PF-800, PF-1380, le PF-585 li fana ka ts'ebetso e phahameng ea mocheso ha li bapisoa le li-polyol tse tloaelehileng.

Li-polyol tse nkhang hamonate li arabela hantle le lihlopha tse mafolofolo tsa isocyanate nakong ea ts'ebetso ea foam ea spray. Marang-rang a polymer a hlahisoang a lokolla meaho e sireletsang ea polyphenolic mochesong o phahameng. Karabelo ena ea lik'hemik'hale e etsa lera la char le sireletsang nakong ea ho pepesehela mocheso. Litlamo tse matla tsa carbon-carbon li fana ka khanyetso ea mocheso, khanyetso e ikhethang ea lik'hemik'hale, le ho lieha ho matla ha malakabe. Ts'ebeliso ea indasteri e itšetlehile ka litene tsena tsa moaho tse nkhang hamonate bakeng sa liphanele tse thata tsa ho kenya mocheso, liboto tsa polyisocyanurate, le li-elastomer tse teteaneng tsa polyurethane. Thepa ea ho qetela e fana ka bophelo bo bolelele ba ts'ebeletso, tšehetso e tšepahalang ea sebopeho, le khanyetso e tsoelang pele ea lik'hemik'hale libakeng tse mabifi tsa indasteri.

Li-glycol tsa Polyethylene tse Phahameng ka ho Fetisisa Ts'ebetsong ea Liindasteri

Kakaretso ea Letoto la Lihlahisoa tsa MOFAN PEG

Li-glycol tsa polyethylenee sebetsa e le li-polymer tse sa sebeliseng ionic tse feto-fetohang ho pholletsa le liindasteri tse fapaneng tsa ts'ebetso. MOFAN e fana ka letoto le felletseng la Polyethylene Glycols tse ntle ho tloha hoPEG1000 to PEG20000. Lisebelisoa tsena tsa polyether tse otlolohileng li na le lihlopha tse sebetsang tsa terminal hydroxyl. Bahlahisi ba sebelisa lihlahisoa tsena e le li-antistatic agents, li-lubricant tsa indasteri, li-release agents, le li-intermediate tsa thepa e tala. Mekhoa ea lik'hemik'hale e itšetlehile ka liketane tsena tse tšepahalang ho laola ho boloka mongobo le ho tlotsa lihlahisoa tse felileng.

Bahlahisi ba diindasteri ba kgetha dikereiti tse ikgethang tsa polyglycol ho latela bolelele ba ketane bo hlokahalang le thepa ya tshebetso. Diindasteri tsa masela, pampiri, tshepe, rabara le meriana di sebedisa metswako ena ya polyether ho ntlafatsa bokgoni ba ho sebetsa. Dikereiti tse tlase tsa boima ba dimolek'hule di fana ka solvency e ntle le ketso ya ho kolobisa. Dikereiti tse phahameng tsa boima ba dimolek'hule di fana ka viscosity e phahameng ya mmele le bokgoni bo matla ba ho tlama. MOFAN e etsa hore kereiti e nngwe le e nngwe ya dikhemikhale e kgotsofatse ditlhaloso tse tiileng tsa mmele ho pholletsa le disebediswa tsa tlhahiso tse iketsang.

Maemo a Bohloeki le Taolo ea Potassium

Ho kopanngoa ha lik'hemik'hale ho hloka bohloeki bo tiileng ba thepa e tala ho netefatsa sekhahla sa karabelo ea sehlopha se ka phetoang. Masalla a sa batleheng a khasete ea li-trace catalyst joalo ka li-ion tsa potassium a sitisa liketso tse bonolo tsa lik'hemik'hale. MOFAN e laola maemo a setseng a potassium nakong ea lits'ebetso tsa tlhahiso ea polycondensation. Ho laola maemo a tšepe e nyenyane ho thibela liketso tse sa batleheng tsa bobeli nakong ea tlhahiso ea polyurethane polymer. Tšilafalo e fokolang ea ionic e boloka viscosity ea metsi e tsitsitseng nakong ea polokelo.

Mekhahlelo ea botekgeniki e hloekileng haholo e fokotsa liphoso tsa sebopeho mefuteng ea tšebeliso ea ho qetela. Mekhoa ea netefatso ea bohloeki e leka sehlopha se seng le se seng sa sehlahisoa ho netefatsa sebopeho sa lik'hemik'hale le ho boloka maemo a tiileng a boleng. Likhetho tsa sehlopha sa USP/NF li khotsofatsa litlhaloso tsa monograph tsa United States Pharmacopeia bakeng sa lihlahisoa tse bonolo tsa bongaka. Litokomane tse felletseng tsa ho latela melao li tsamaea le mekhahlelo ea meriana ho fana ka ho latela ka botlalo sehlopha. Ho fumaneha ha USP/NF, Food (E1521), le mekhahlelo ea botekgeniki ho lumella baenjiniere ho khetha boemo bo nepahetseng ba bohloeki bakeng sa litlhoko tse nepahetseng tsa ts'ebeliso.

Mefuta ea 'Mele ho tloha ho Metsi ho ea ho Phofo

Boima ba limolek'hule tsa polyglycol bo khetholla boemo ba eona ba 'mele mochesong oa kamore. Liketane tse khutšoane tsa polymer li lula li le metsi a metsi, ha liketane tse telele li tiea ho ba lintho tse tiileng tse kang boka kapa phofo.

Metjhini e etsang dihlahiswa e kgetha dibopeho tsa sebele ho ntlafatsa mekgwa ya ho sebetsana le tlhahiso. Phofo e sitsweng e phalla ka bolokolohi ka hara dihopper tse kopanyang tse ommeng ka boiketsetso. Dibopeho tsa metsi di kopana hang-hang le melapo ya dikhemikhale tse metsi ntle le ho kenya mocheso. Di-paste tse tiileng hanyane di fana ka dibopeho tse boreleli tsa setlolo ha ho lokiswa meriana. MOFAN e fana ka dibopeho tse tsitsitseng tsa sebele ho nolofatsa ho kopanya dikhemikhale tsa indasteri.

Litšebeliso tsa Liindasteri tsa Polyether le Mekhoa ea PEG

Likhomaretsi tsa Polyurethane, Li-Sealant le Liaparo

Baqapi ba liforomo ba khethali-polyol tse khethehilengho etsa likhomaretsi tse sebetsang hantle, li-sealant, li-coat tse sireletsang le li-castings tsa sebopeho. Litsamaisong tsa CASE, li-polyol tse sebetsang ka mokhoa o fapaneng le tse sebetsang ka mokhoa o tharo li haha ​​​​marang-rang a tenyetsehang ka boits'oaro bo ka lebelloang ba ho phekola. Hangata li-formulator li totobatsa li-polyether diol le li-polyol tsa triol tse nang le boima ba limolek'hule ho tloha ho 1000 ho isa ho 3000 bakeng sa thepa ea polyurethane e sa tenyetseheng e sa foam. Li-block tsena tse sebetsang tsa kaho li theha litlamo tse matla tsa urethane tse bolokang matla tlas'a khatello ea mechine e pheta-phetoang.

Li-polyol tsa polyether tse nang le mohloli o le mong li fana ka botsitso bo phahameng ba hydrolytic ha li bapisoa le k'hemistri ea polyester libakeng tsa ts'ebetso e mongobo. Mekhahlelo ea polyether e metsi e boloka ho tenyetseha mochesong o ka tlase ho lefela hobane li na le mocheso o tlase oa phetoho ea khalase. Mohlala, mekhahlelo ea polypropylene glycol e bontša boleng ba phetoho ea khalase haufi le -60°C. Poly(tetramethylene ether) glycol e fana ka mocheso oa phetoho ea khalase ho fihlela ho -75°C. Litšobotsi tsena tsa ts'ebetso li thibela ho petsoha pele ho nako ho li-sealant tsa manonyeletso a kantle. Liaparo tsa fatše tsa indasteri li sebelisa li-polyol tse sebetsang hantle ho eketsa bongata ba li-crosslink. Ho kopanya ho phahameng ho etsa libaka tse teteaneng tse hanelang ho tšoloha ha lik'hemik'hale tse mabifi le ho hohlana ha mechini. Ho feta moo, likhomaretsi tsa likarolo tse peli li itšetleha ka li-resin tse nang le viscosity e tlase bakeng sa ho kolobisa bokaholimo ka potlako. Litsamaiso tsena tse arabelang li theha lihokelo tsa urethane tse matla tse kopanyang litšepe, polasetiki le metsoako ea sebopeho ka mokhoa o sireletsehileng. Li-elastomer tse khethehileng tsa polyurethane li fana ka matla a phahameng a ho khutla mabiling a indasteri a lahliloeng le litulong tsa lieta tsa microcellular. Ho feta moo, mekhoa e ikhethileng bakeng sa li-elastomer tsa polyurethane e fana ka khanyetso e ikhethang ea ho taboha tlas'a meroalo e boima e matla.

Foam e Tenyetsehang, e Matla le e Tiileng ea ho Sireletsa

Tlhahiso ea foam e itšetlehile ka ho bapisa ts'ebetso ea hydroxyl le bolelele ba ketane le litlhoko tse ikhethileng tsa tekheniki. Tlhahiso ea foam ea slabstock e bonolo e sebelisa li-polyol tse telele tsa ketane tse nang le ts'ebetso e tlase pakeng tsa 2 le 3. Baqapi ba khetha li-polyol tse khethehileng tse nang le boima ba limolek'hule ho tloha ho 2000 ho isa ho 7000 ho hlahisa meaho e tenyetsehang ea sele bakeng sa lihlahisoa tsa ho roala thepa ea ka tlung le tsa bethe. Li-foam tse matla haholo li kopanya li-polymer tse ikhethileng tse arabelang ho ntlafatsa bokhoni ba ho jara mojaro le ho khutla ha sele. Mekhoa e bonolo le e bonolo haholo e hloka li-additives tsa ho bula sele ho leka-lekanya khatello ea pneumatic ea kahare le ho thibela ho fokotseha ha foam kamora ho bopa. Lisebelisoa tsa kahare tsa likoloi li sebelisa litsamaiso tse tenyetsehang tse ikhethileng ho haha ​​​​litulo tsa likoloi tse phutholohileng, li-armrest, li-headrest le li-acoustic tse sireletsang molumo.

Lifomo tse tiileng tsa ho thibela mocheso li hloka maemo a holimo a ho hokahanya ho fihlela ho tiea ha sebopeho le botsitso ba litekanyo tlas'a meroalo ea mocheso. Li-formulator li sebelisa li-polyol tse nang le boleng ba ts'ebetso bo kaholimo ho 3 le linomoro tse phahameng tsa hydroxyl. Bongata bo phahameng ba li-crosslink bo etsa meaho ea lisele tse koetsoeng tse tšoasang likhase tse thibelang mocheso ka har'a matrix ea polymer e tiileng. Meaho ena ea lisele tse tiileng e fana ka botsitso ba nako e telele ba hydrolytic maemong a tikoloho a kantle. Boholo ba lisele tse tšesaane bo ntlafatsa matla a ho hatella a mechini ha bo ntse bo boloka motlakase o tlase liphanele tsa ho thibela mocheso. Likoloi tsa lipalangoang tse sehatsetsing, lisebelisoa tsa khoebo, le ho thibela ho fafatsa li itšetlehile ka litsamaiso tsa polyurethane tse tiileng ho thibela phetiso ea mocheso. Merero ea kaho e kenya liphanele tsa polyisocyanurate tse entsoeng esale pele ho fokotsa tšebeliso ea matla a moaho. Lifomo tse tiileng tse bōpiloeng li boetse li fana ka litharollo tsa ho paka tse ikhethileng bakeng sa lisebelisoa tsa elektroniki tse senyehang habonolo.

Litšebeliso tsa PEG ho Masela, Rabara le Meriana

Li-polymer tsa polyethylene glycol li sebetsa e le lithuso tse feto-fetohang tsa ts'ebetso e seng ea ionic lits'ebetsong tse fapaneng tsa indasteri. Mekhahlelo e fapaneng ea boima ba limolek'hule e fana ka litšobotsi tse ikhethang tsa ts'ebetso ts'ebetsong ea tlhahiso.

• Ts'ebetso ea Masela:Meedi e kang PEG-200 e sebetsa e le di-softeners le di-antistatic agents. Meedi e mahareng jwalo ka PEG-400, 600, le 800 e sebetsa e le di-lubricant le di-substance tse kolobisang nakong ya ho qeta faeba. Dikgetho tse phahameng tsa boima ba dimolek'hule jwalo ka PEG-4000 di sebetsa e le di-plasticizer tse kgomaretsang le di-softeners.
• Tlhahiso ea Rabara:PEG-1000 le 1500 li sebetsa e le li-dispersant tse khothalletsang ho qhibilihisa ha vulcanization ka katleho le ho hasana ha carbon black. Likereiti tse tiileng tse kang PEG-4000 le 8000 li sebetsa e le li-agent tse sebetsang tsa ho lokolla hlobo, litlolo le li-coolant.
• Mekhoa ea Meriana:Li-polyol tse qhibilihang ka metsing li sebetsa e le lintho tse thusang le tse sebetsang lipakeng tsa lihlahisoa tsa bongaka. Lisebelisoa tsena tse tala tse hloekisitsoeng li ntlafatsa ho qhibiliha ha meriana ka mafolofolo, katleho ea ho kopanya, le ts'ebetso ea ho fana ka meriana ka molomo le ka holim'a letlalo.

Mekhoa ea ho sebetsa ka tšepe ea indasteri e itšetlehile ka li-polyethylene glycols bakeng sa ho pholisa, ho tlotsa le ho fetisetsa mocheso. Bahlahisi ba pampiri ba sebelisa litharollo tsa polyglycol ho laola ho boloka mongobo le ho ntlafatsa boreleli ba bokaholimo. Lisebelisoa tsena tse sebetsang li fana ka botsitso ba lik'hemik'hale ho pholletsa le libate tsa ho sebetsa tse nang le asiti le alkaline. Mesebetsi ea indasteri ea sejoale-joale e khetha boima bo itseng ba polymer ho ntlafatsa lebelo la ho sebetsa le boleng ba sehlahisoa.

Mekhoa ea Khetho bakeng sa MOFAN Special Polyols

Ho bapisa Litekanyetso tsa Hydroxyl le Ts'ebetso le Litlhoko tsa Ts'ebeliso

Khetho e sebetsang ea polyol e hloka lipalo le ts'ebetso e tsamaellanang ea hydroxyl ho shebana le litekanyo tsa 'mele. Ts'ebetso e khetholla sebopeho sa khokahano ea marang-rang a phekotsoeng. Litekanyetso tsa Hydroxyl li lekanya mahloriso a sebaka sa hydroxyl se sebetsang ka yuniti e 'ngoe le e 'ngoe ea boima. Litekanyetso tse tlase tsa hydroxyl tse nang le ts'ebetso pakeng tsa 2 le 3 li hlahisa marang-rang a tenyetsehang. Litekanyetso tse phahameng tsa hydroxyl tse nang le ts'ebetso pakeng tsa 4 le 8 li theha meaho e tiileng ea thermoset. Baqapi ba li-formula ba hlahloba litekanyo tsena ho leka-lekanya litšobotsi tsa ho qetela tsa mechini. Mohlala, polyol ea polyether e nang le boleng ba hydroxyl ba 150 mg KOH/g le boima ba limolek'hule ba palo-karolelano ea 1200 g/mol e bontša ts'ebetso e haufi le 3.2. Baqapi ba li-formula ba sebelisa sehlopha sena se ikhethileng ho hlahisa liphanele tsa foam tse thata-thata bakeng sa liphanele tsa kahare tsa likoloi.

Ho Ntlafatsa Viscosity, Reactivity, le Curing Kinetics

Katleho ea ts'ebetso e itšetlehile ka boitšoaro bo nepahetseng ba phallo le lebelo la pholiso. Ho khetha li-polyol tse metsi tse nang le boima bo loketseng ba limolek'hule ho laola viscosity ea motheo. Li-formulator li eketsa calcium carbonate e potlakileng ka har'a loading ea 20-40 wt.% ho haha ​​​​ho hanyetsa ho sag. Ho phaella moo, ho eketsa fumed silica ka har'a loading ea 2-5 wt.% ho fana ka boits'oaro bo matla ba thixotropic ho thibela ho sag holim'a li-substrate tse otlolohileng. Ho kopanya li-prepolymers ka karolelano ea isocyanate ho hydroxyl pakeng tsa 1.8:1 le 2.5:1 ho thusa ho tsitsisa viscosity ea sistimi. Khetho e hlokolosi ea polyol e nolofatsa ts'ebetso e matla ho pholletsa le lisebelisoa tse iketsang tsa ho aba.

Li-catalyst tsa Organotin tse kang DBTDL ka mojaro oa 0.01-0.1 wt.% li theha sekhahla sa karabelo se ka lebelloang. Li-additives tsena li khothalletsa ho thehoa ha urethane ho tiisa bokaholimo bo se nang tack nakong ea metsotso e 30 ho isa ho e 90. Li-catalyst tsa amine tse phahameng li rata ho potlakisa liprofayili tsa ho folisa lits'ebetsong tsa polyurethane. Ho bapisa li-catalyst tse sebetsang le li-polyol tse sebetsang ho thibela ho thehoa ha lesoba likarolong tse teteaneng tse bōpiloeng.

Ho Ntlafatsa Botsitso ba Thempereichara le Khanyetso ea Tikoloho

Khetho ea lesapo la mokokotlo e laola botsitso ba hydrolytic le khanyetso ea lik'hemik'hale ea nako e telele. Li-polyol tsa polyether li boloka botsitso bo botle ba hydrolytic, li tšoarella lihora tse fetang 2000 mongobong oa 95% le 70°C ntle le tahlehelo e kholo ea thepa. Ka lehlakoreng le leng, li-polyester polyol lia senyeha kapele tlas'a mongobo o phahameng hobane mongobo o hlasela likhokahano tsa ester. Ho khetha li-polyol tse ling ho e-na le li-polyol tsa polyester ho ntlafatsa khanyetso ea metsi ho li-elastomer tsa polyurethane. Li-polyol tse khethehileng li fana ka khanyetso e ntle ea lik'hemik'hale libakeng tse hlokang thuso. Li-polyol tse khethehileng tsa polybutadiene li boloka boima bo fetang 98.5% nakong ea ho pepesehela khafetsa ho 100°C ka lihora tse 1000, li boloka phapang ea modulus ea elastic tlas'a 100%.

Methapo e monko o monate e fana ka ho tiea ha mocheso ho hanela meroalo e phahameng ea mocheso ho tsoa mefuteng e sa arajoang ea isocyanate. Likhetho tsa Aliphatic li thibela ho fifala ho matla ha UV. Li-formulator li eketsa li-antioxidants ho 0.5–1.5 wt% ho ntlafatsa khanyetso ea oxidative ea nako e telele. Ho eketsa li-stabilizer tsa UV ho 0.5–2.0 wt% ho sireletsa thepa ea kantle khahlanong le tšenyo ea mahlaseli a letsatsi. Khetho e nepahetseng ea polyol e netefatsa hore li-polyol tse khethehileng tse ikhethileng li boloka thepa ea bohlokoa ea polyurethane lits'ebetsong tse fapaneng tsa kantle.

Li-polyol tse khethehileng tsa MOFANle letoto la polyethylene glycol e phahameng li fana ka boleng ba motheo ho pholletsa le boenjiniere ba sejoale-joale ba polymer. Meralo e nepahetseng ea limolek'hule e lumella li-polyol ho ntlafatsa kinetics ea karabelo le matla a 'mele a marang-rang. Thepa ea thepa e etselitsoeng motho ka mong e ntlafatsa ts'ebetso ea sehlahisoa ka ho toba ho likhomaretsi tsa polyurethane, li-sealant tsa sebopeho, li-elastomer tse matla, le li-foam tse thata tsa ho thibela mocheso. Li-formulator li theha khanyetso e phahameng ea lik'hemik'hale, botsitso ba mocheso, le ho tšoarella ha mechini ka k'hemistri e sebetsang e laoloang. Ts'ebetso ea ts'ebetso ea indasteri e fihlella katleho e phahameng ea tlhahiso ka litharollo tsena tsa lik'hemik'hale tse hloekileng haholo ho pholletsa le mela e fapaneng ea ts'ebetso. Bareki ba indasteri ba mengoa ho buisana le litsebi tsa tekheniki tsa MOFAN ho nts'etsapele mekhoa e ikhethileng, ho sebetsana le lipheo tse thata tsa ts'ebetso, le ho fumana tšehetso e inehetseng bakeng sa litlhoko tse rarahaneng tsa tlhahiso.

LBH