Tataiso ea Moralo oa Sebopeho sa Polyol: Ho tloha Khethong ea Monomer ho ea Ts'ebetsong ea Ts'ebetso
Ho Utloisisa Khemistri e ka Morao ho Li-Polyster Polyol tse Phethahetseng ka ho Fetisisa bakeng sa Likopo tsa Polyurethane
Polyester polyol ke e 'ngoe ea thepa ea bohlokoa e sebelisoang lits'ebetsong tsa polyurethane (PU), ho kenyeletsoapolyurethane e tsamaisoang ke metsi, li-elastomer tsa polyurethane, liphahlo, likhomaretsi, letlalo la maiketsetso, le polyurethane ea thermoplastic (TPU).
Tshebetso ya sehlahiswa sa polyurethane e susumetswa haholo ke sebopeho sa dimolek'hule le thepa ya polyester polyol. Mabaka a kangKhetho ea monomer, mofuta oa catalyst, karolelano ea joala le asiti, boleng ba hydroxyl, boima ba limolek'hule, le ts'ebetso ea ho kopanyakaofela li etsa qeto ea ts'ebetso ea ho qetela ea lisebelisoa tsa PU.
Sengoloa sena se hlalosa mokhoa oa ho etsa moralo oa polyester polyols, ho tloha khethong ea thepa e tala ho isa taolong ea ts'ebetso ea tlhahiso, ho thusa bahlahisi ba polyurethane ho utloisisa hamolemo mokhoa oa ho nts'etsapele polyester polyols bakeng sa lits'ebetso tse fapaneng.
1. Mokhoa oa ho Khetha Dicarboxylic Acids bakeng sa Polyester Polyol Formulation?
Dicarboxylic acids di etsa qeto ka sebopeho sa motheo sa mokokotlo oa polyester polyols. Khetho ea likarolo tsa asiti e ama ka ho toba:
Ho khetha sebopeho se nepahetseng sa asiti ke mohato oa pele moralong oa tlhahiso ea polyester polyol.
Li-Acid tse Monate: Ho Ntlafatsa ho Tiea le ho Hanela Mocheso
Asiti ea Isophthalic (IPA) le Asiti ea Terephthalic (PTA)
Li-acid tse nkhang hamonate tsa dicarboxylic li sebelisoa haholo ho ntlafatsa:
Asiti ea Terephthalic (PTA)e na le sebopeho se otlolohileng se tsitsitseng haholo le tšekamelo e matla ea ho etsa likristale.
Ha PTA e arabela ka di-diols tse kgutshwane tse kang ethylene glycol (EG) kapa 1,4-butanediol (BDO), sebopeho sa polyester se hlahang se ka bontsha boitshwaro bo matla ba ho etsa kristale, e leng se etsang hore polyester polyol e be boka kapa e tiee mochesong wa kamore.
Sena se ka fokotsa:
- ✖Ho tsitsa ha metsi
- ✖Botsitso ba polokelo
- ✖Bonolo ba kopo
Ka hona, li-polyester polyol tse hloekileng tse thehiloeng ho PTA ha li sebelisoe hangata li le mong mefuteng e sebetsang.
Asiti ea Isophthalic (IPA)e na le sebopeho sa limolek'hule se sa lekanang hakaalo hobane lihlopha tse peli tsa carboxyl li sebakeng sa meta. Sena se fokotsa tšekamelo ea kristale 'me se ntlafatsa botsitso ba metsi.
Li-polyester polyol tse thehiloeng ho IPA hangata li fana ka:
- ✔Tg e Phahameng
- ✔Ponaletso e betere
- ✔Phallo e ntlafetseng
Mefuteng e mengata ea liindasteri, IPA e hlahisoa hammoho le PTA kapa li-acid tsa aliphatic ho leka-lekanya ho tiea le ho tenyetseha.
Li-acid tsa Aliphatic: Ho eketsa ho tenyetseha
Asiti ea Adipic (AA)
Asiti ea Adipic ke e 'ngoe ea li-acid tsa aliphatic dicarboxylic tse sebelisoang haholo tlhahisong ea polyester polyol.
Ketane ea eona e tenyetsehang ea khabone e tšeletseng e fana ka:
- •Ho tenyetseha ha mocheso o tlase
- •Ho tenyetseha ho hotle
- •Tg e fokotsehileng
Hangata li-polyester polyol tse thehiloeng ho Adipic acid li na le boleng ba Tg bo ka bang-60°C ho isa ho -40°C, ho itshetlehile ka sebopeho sa dimolek'hule.
Adipic Acid (AA) + 1,4-Butanediol (BDO)
e sebelisoa haholo ho li-elastomer tsa polyurethane hobane:
- AA e fana ka likarolo tse bonolo tse tenyetsehang
- BDO e ntlafatsa botsitso ba ketane le kristale ea 'mele
Sebopeho sena se tlatsetsa ho:
- •Matla a ho tsikinyeha a phahameng
- •Khanyetso e ntle ea ho khohlela
- •Tshebetso e ntle haholo ea mechini
Asiti ea Sebacic (SA)
Asiti ea sebacic e na le ketane e telele ea khabone ho feta asiti ea adipic.
Melemo:
- ✔Ho tenyetseha ho hoholo
- ✔Tshebetso e betere ea mocheso o tlase
- ✔Matlotlo a ntlafetseng a ho se rate metsi
Leha ho le jwalo, ka lebaka la theko ya yona e hodimo, SA e sebediswa haholoholo ditshebedisong tsa polyurethane tse sebetsang hantle moo ho hlokahalang khanyetso e matla ya serame.
Likarolo tse sebetsang tsa asiti: Dimer Acid le Phthalic Anhydride
Asiti ea Dimer
Asiti ea Dimer e hlahisa:
- •Liketane tse telele tse tenyetsehang tsa limolek'hule
- •Matlotlo a tshabang metsi
- •Ho tenyetseha ho ntlafetseng
- •Ho hanyetsa hydrolysis ho betere
Leha ho le jwalo, ho eketsa dikahare tsa dimer acid ho ka fokotsa Tg le ho thatafala. Hangata e nkuwa e le ya ditsamaiso tsa polyurethane tse hlokang ho tenyetseha le ho hanyetsa mongobo.
Anhydride ea Phthalic (PA)
Anhydride ea Phthalic ke karolo e nkhang hamonate e theko e tlaase e nang le katleho e ntle ea karabelo.
E ka ntlafala:
- ✔Bothata
- ✔Ho tiea
- ✔Tlholisano ea litšenyehelo
Leha ho le jwalo, ka lebaka la ditlamorao tsa steric, karabelo ya yona ya sehlopha sa bofelo e tlase ha e bapiswa le IPA.
Leano le Tloaelehileng la Moralo oa Asiti
Leano le tloaelehileng la ho etsa polyester polyol ke:
- •Li-acid tse nkhang hamonate: li fana ka ho tiea le matla
- •Li-acid tsa Aliphatic: li fana ka ho tenyetseha le ho tiea
Karolelano ea IPA/AA e ka bang 7:3
e ka fana ka sebopeho se leka-lekaneng ka:
- Tg e itekanetseng
- Ho tsitsa ha ts'ebetso hantle
- Matla a mechini ka mor'a ho phekoloa ha polyurethane
Karolelano e nepahetseng e lokela ho lokisoa kamehla ho latela ts'ebeliso e reriloeng.
2. Mokhoa oa ho Khetha Diols bakeng sa Moralo oa Polyol oa Polyel?
Haeba di-dicarboxylic acid li khetholla mokokotlo oa sebopeho, diol li sebetsa e le balaoli ba bohlokoa ba:
Ethylene Glycol (EG)
Ethylene glycol ke diol e bonolo ka ho fetisisa e sebelisoang k'hemistri ea polyester.
Ka lebaka la sebopeho sa eona se sekhutšoanyane sa limolek'hule, EG e fana ka:
- •Ho latela ketane e phahameng
- •Tšekamelo e matla ea ho etsa kristale
Ha e kopantswe le PTA, EG e ka theha dibopeho tsa kristale tse kang PET, tse ka etsang hore polyester polyols e tiee mochesong wa kamore. Ka hona, polyester polyols e hlwekileng e thehilweng ho EG ha e tlwaelehe.
Mefuteng e sebetsang, EG hangata e kopanngoa le:
ho lokisa kristale le ts'ebetso ea ts'ebetso.
Molemo o mong oa bohlokoa oa EG ke oa eona:
- ✔Theko e tlase
- ✔Ho fumaneha ka bongata
Bakeng sa tlhahiso ea polyester polyol e thehiloeng ho thepa ea PET e sebelisitsoeng hape, EG e ntse e le thepa ea bohlokoa e tala.
Diethylene Glycol (DEG)
DEG e kenya dibopeho tsa ether ka hara ketane ya polyester.
Khokahano e tenyetsehang ea ether e fana ka:
- •Tg e ka Tlase
- •Ho fokotseha ha viscosity
- •Tshebetso e betere ea phallo
Li-polyester polyol tse thehiloeng ho DEG li sebelisoa haholo ha ho sebetsa ho tenyetseha ho le bohlokoa.
Leha ho le jwalo, dibonto tsa ether di ka nna tsa ba le kganyetso e tlase ho oxidation ya mocheso wa nako e telele. Ka hona, ditsamaiso tsa DEG hangata di kopanngwa le diol tse tsitsitseng haholoanyane tse kang NPG.
Neopentyl Glycol (NPG)
NPG e na le sebopeho sa khabone sa quaternary se nang le lihlopha tse peli tsa methyl.
Sebopeho sena se ikhethang se thibela motsamao oa limolek'hule 'me se fana ka:
- •Tg e Phahameng
- •Botsitso bo botle ba mocheso
- •Khanyetso e phahameng ea boemo ba leholimo
- •Khanyetso e ntlafetseng ea hydrolysis
Ka lebaka la ho tšoarella ha eona hantle, NPG e sebelisoa haholo ho:
- •Liaparo tsa PU
- •Lisebelisoa tsa kantle
- •Mekhoa ea polyurethane e hanelang boemo ba leholimo
1,4-Butanediol (BDO)
1,4-Butanediol ke e 'ngoe ea li-diol tsa bohlokoa ka ho fetisisa tse sebelisoang lits'ebetsong tsa polyurethane elastomer le TPU.
Sebopeho sa eona se otlolohileng sa khabone tse 'ne se fana ka:
- •Ho latela ketane hantle
- •Tšebelisano e matla ea limolek'hule
- •Thepa e ntle ea mechini
Ha e kopantsoe le li-aromatic acid tse kang PTA, BDO e ka theha likarolo tse kristale tse hlophisitsoeng hantle tse tšoanang le meaho ea PBT.
Sena se tlatsetsa ho:
- ✔Matla a ho tsikinyeha a phahameng
- ✔Ho hanyetsa ho khohlela ho betere
- ✔Ho hokahanya ho ntlafalitsoeng ha 'mele
Leha ho le jwalo, dikahare tse ngata tsa BDO di ka eketsa tshekamelo ya ho etsa kristale, e leng se etsang hore polyester polyols e be boka kapa e tiee mochesong wa kamore.
Ho ntlafatsa tshebetso ya ho sebetsana le disebediswa, BDO hangata e kopanngwa le:
ho fokotsa ho kristale ho feteletseng ha o ntse o boloka matla a mechini.
Trimethylolpropane (TMP): Ho Hlahisa Makala a Laoloang
Trimethylolpropane (TMP) ke joala bo sebetsang ka mesebetsi e mengata bo nang le lihlopha tse tharo tsa hydroxyl. Ho fapana le diol tse tloaelehileng, TMP e kenya meaho ea makala ho polyester polyols.
TMP e nyane e ka eketseha:
- •Makala a limolek'hule
- •Botenya ba Crosslink
- •Ho thatafala ha polyurethane ho qetela
TMP e sebediswa haholo ha ho ralwa:
- •Liaparo tsa polyurethane tse sebetsang hantle
- •Mekhoa e tiileng ea PU
- •Li-prepolymer tsa polyurethane tse nang le makala
Mefuteng e mengata ea metsoako, tekanyo ea TMP e laoloa ka hloko hobane makala a mangata a ka eketsa viscosity haholo le ho fokotsa ho sebetsa hantle.
3. Mokhoa oa ho Fetola Karolelano ea Joala le Asiti ho Popoester Polyol Formulation?
Ho fapana le tlhahiso ea polymer ea PET, polyester polyols ha e hloke boima bo phahameng haholo ba limolek'hule.
Sepheo sa bohlokoa ke ho laola:
Karolelano e Feteletseng ea Joala
Motswakong wa polyester polyol, dikarolo tsa jwala hangata di sebediswa ka bongata ho fihlella dibopeho tse fedisitsweng ke hydroxyl.
Bakeng sa polyols tse nang le boima bo tlase ba limolek'hule, karolelano ea joala bo feteletseng e ka eketsoa ho:1.8–2.0: 1
Litekanyetso tse phahameng tsa hydroxyl li fana ka lihlopha tsa hydroxyl tse arabelang haholoanyane bakeng sa ho thehoa ha polyurethane.
Leha ho le jwalo, ho noa joala ho feteletseng ho ka fokotsa boima ba limolek'hule mme ha ama hampe:
Ka hona, karolelano ea joala le asiti e lokela ho ntlafatsoa ho latela ts'ebeliso ea ho qetela ea polyurethane.
Kamano Pakeng tsa Karolelano ea Joala le Boleng ba Asiti
Nakong ea tlhahiso ea polyester polyol, metsi a hlahisoang a tlosoa khafetsa ho khanna liketso tsa esterification le condensation pele.
Haeba ho noa joala ho feteletseng ho sa lekana:
- •Khakanyo ea asiti e ntse e le holimo
- •Karabelo e lieha
- •Boleng ba ho qetela ba asiti bo ba thata ho bo fokotsa
Boleng bo tlase ba asiti bo bohlokoa hobane li-acid tse setseng li ka ama liketso tsa polyurethane. Ha polyester polyol e arabela le li-isocyanate, mongobo o setseng le likarolo tsa asiti li ka kenya letsoho ho:
Bakeng sa lits'ebetso tse ngata tsa polyurethane, ho laola boleng ba asiti ka tlase:1 mg KOH/gke sepheo sa bohlokoa sa boleng.
4. Mokhoa oa ho KhethaLi-catalystbakeng sa Tlhahiso ea Polyol ea Polyol?
Li-catalyst li bapala karolo ea bohlokoa ho laoleng:
Tetrabutyl Titanate (TBT)
Tetrabutyl titanate e sebelisoa haholo ka lebaka la:
- ✔Mosebetsi o phahameng oa ho kenya tšebetsong
- ✔Sekhahla se potlakileng sa esterification
- ✔Litšenyehelo tsa tlholisano
Leha ho le jwalo, metsoako e setseng ya titanium e ka potlakisa hydrolysis ya ester bond, e leng ntho e ka bang bothata ditsamaisong tsa polyurethane tse utlwang mongobo.
Okside ea Butyl Tin (BTO)
Butyl tin oxide e fana ka:
- ✔Tshebetso e atlehang ea ho netefatsa esterification
- ✔Ho hanyetsa hydrolysis ho betere
- ✔Ho ntlafala botsitso ba nako e telele
Bakeng sa lits'ebetso tse kang polyurethane e tsamaisoang ke metsi, moo ho hanyetsa ha hydrolysis ho leng bohlokoa haholo, litsamaiso tsa catalyst tse thehiloeng ho BTO hangata lia khethoa.
Khetho pakeng tsa TBT le BTO e ipapisitse le:
5. Taolo ea Ts'ebetso ea Tlhahiso ea Polyol
Ts'ebetso ea ho kopanya e ama ka kotloloho boleng ba ho qetela ba polyester polyols.
Mekhahlelo e meholo e kenyelletsa:
- Ho qhibilihisa 'mele
- Ho kolobisa ha bongata ba mokelikeli
- Boleng ba Hydroxyl le phetoho ea boleng ba asiti
Mohato oa 1: Mokhahlelo oa Esterification
Nakong ea mohato oa esterification, thepa e latelang e kenngoa ka har'a reactor:
Hangata karabelo e qala hoo e ka bang:180°C
Metsi a hlahisoang ke esterification a tlosoa ka:
- •Ho hlobolisa naetrojene
- •Sistimi ea li-condenser
Tsoelo-pele ea karabelo e ka hlahlojoa ka:
- •Palo ea pokello ea metsi
- •Teko ea boleng ba asiti
Mohato oa 2: Mokhahlelo oa ho kolobisa ha polycondensation
Kamora ho esterification, sistimi e kena mohatong oa polycondensation.
Maemo a tloaelehileng:
- •Mocheso:200–220°C
- •Khatello e fokotsehileng: ts'ebetso ea vacuum
Vacuum e thusa ho tlosa metsi a setseng le joala bo bongata, e leng se etsang hore limolek'hule li hōle.
Leha ho le jwalo, mocheso o feteletseng kapa nako e telele ya karabelo e ka baka dikarabelo tse ka thoko, keketseho ya mmala, le ho senyeha ha polymer. Ka hona, maemo a tshebetso a lokela ho laolwa ka hloko.
Mohato oa 3: Taolo ea Lintlha tsa Qetello
Ho fapana le polymerization ea PET, tlhahiso ea polyel ea polyol ha e hloke nts'etsopele ea boima bo phahameng haholo ba limolek'hule. Matšoao a mantlha a boleng ke:
Boleng ba Hydroxyl
E fumana ts'ebetso ea karabelo ea polyurethane le karolelano e hlokahalang ea isocyanate.
Boleng ba Asiti
E bontša ho phethoa ha karabelo le dikahare tsa asiti tse setseng.
Sepheo se tloaelehileng sa indasteri:Boleng ba asiti <1 mg KOH/gpele ho lokolloa.
Ho hloka vacuum e lekaneng ke e 'ngoe ea mabaka a mantlha a:
- ✖Mongobo o mongata o setseng
- ✖Boleng bo phahameng ba asiti
- ✖Tshebetso e mpe ea polyurethane
6. Kakaretso ea Moralo oa Polyol ea Polyel
| Ntlha ea Moralo | Diphetoho tsa Bohlokwa | Molao-motheo oa Khetho | Mefuta e Tloaelehileng |
|---|---|---|---|
| Ho tiea ha mokokotlo | IPA, PTA, AA, SA | Li-acid tse nkhang hamonate li ntlafatsa ho tiea ha tsona; li-acid tsa aliphatic li ntlafatsa ho tenyetseha ha tsona | IPA/AA ≈ 7:3 |
| Phetoho ea Tg | EG, DEG, NPG, BDO | EG e eketsa kristale; DEG e fokotsa viscosity; NPG e ntlafatsa ho tšoarella; BDO e ntlafatsa matla | Ho ipapisitsoe le kopo |
| Taolo ea boima ba limolek'hule | Karolelano ea joala le asiti | Ho feta tekano ha joala ho hlahisa dibopeho tse fedisitsweng ke hydroxyl | Joala/Asiti = 1.3 |
| Khetho ea Catalyst | TBT khahlano le BTO | TBT bakeng sa karabelo e potlakileng; BTO bakeng sa botsitso bo betere ba hydrolysis | BTO 0.2–0.5‰ |
| Taolo ea makala | TMP/Glycerol | Litlatsetso tse nyane li ntlafatsa bongata ba li-crosslink | TMP ≤3 mol% |
7. Moralo oa Polyel Polyol o Ama Tshebetso ea Polyurethane Joang?
Moralo oa polyester polyols o lokela ho qala kamehla ho tloha ts'ebelisong ea ho qetela ea polyurethane.
| Kopo | Moralo o Khothaletsoang oa Polyol oa Polyel |
|---|---|
| Likhomaretsi tsa PU | Li-polyester tse thehiloeng ho AA tse feto-fetohang bakeng sa ho khomarela le ho tiea ho matla |
| Liaparo tsa PU | Mekhoa ea IPA/NPG bakeng sa ho thatafala le ho hanyetsa boemo ba leholimo |
| Li-elastomer tsa TPU | Mekhoa ea AA + BDO bakeng sa matla a mechini le ho hanyetsa ho khohlela |
| PU e tsamaisoang ka metsi | Li-polyester polyol tse hanelang hydrolysis tse nang le litsamaiso tse ntlafalitsoeng tsa catalyst |
| Letlalo la Maiketsetso | Li-polyester tse tenyetsehang tse nang le bonolo bo laoloang |
Qeto: Moralo oa Polyol oa Polyel o Hloka Taolo ea Sebopeho sa Limolek'hule
Li-polyester polyol tse sebetsang hantle ha li hlahisoe ka ho kopanya feela thepa e tala. Li hloka moralo o hlophisitsoeng o thehiloeng ho:
Ka ho laola ka hloko:
Bahlahisi ba ka hlahisa polyester polyols tse nang le thepa e ntlafalitsoeng bakeng sa lits'ebetso tse fapaneng tsa polyurethane.
Bakeng sa bahlahisi ba polyurethane, ho khetha thepa e tala le sistimi ea catalyst e nepahetseng ho bohlokoa ho fihlella ts'ebetso e betere ea ts'ebetso, botsitso ba sehlahisoa le thepa ea ho qetela ea thepa.
MOFAN e fana ka litharollo tsa li-catalyst tsa polyurethane le tse ikhethangthepa e tala ea polyurethanee etselitsoe ho tšehetsa lits'ebetso tse fapaneng tsa PU, ho kenyeletsoa le lipente, likhomaretsi, li-elastomer, le litsamaiso tse ling tse tsoetseng pele tsa polyurethane.
Ikopanye le MOFANbakeng sa tšehetso ea profeshenale ea ho etsa polyurethane le litharollo tse ikhethileng.
Nako ea poso: Phato-07-2026