Hauv cov tshuaj polymer, cov polyols tshwj xeeb ua cov khoom tseem ceeb. Cov pab pawg Hydroxyl cuam tshuam nrog isocyanates los tsim cov kev sib txuas urethane muaj zog. MOFAN tsim cov koob tshuaj polyether thiab cov polyethylene glycols zoo dua (PEG) rau cov kab ke kev lag luam. Cov kws ua haujlwm tshuaj siv cov khoom no hauv cov rwb thaiv tsev nruj, ua npuas dej yooj ywm, thiab polyurethane elastomers.

Txoj kev loj hlob no qhia txog qhov ntsuas kev lag luam ntawm polyols thoob plaws kev tsim khoom lag luam.

Cov Ntsiab Lus Tseem Ceeb

• Cov polyols tshwj xeebtsim cov kev sib txuas urethane muaj zog nrog isocyanates los tsim cov polyurethanes ua tau zoo.
• Polyether polyols tiv taus kev puas tsuaj los ntawm dej zoo dua li polyester polyols hauv cov chaw ntub dej.
• Cov polyols ua haujlwm tau zoo ua rau kom muaj qhov sib txuas ceev kom ua rau cov khoom tawv thiab tiv taus cua sov.
• Cov diols uas muaj cov molecular hnyav ntau txo cov urethane kom cov sealant yoog tau yooj yim thaum kub qis dua xoom.
• Cov polyols uas muaj ntxhiab tsw qab muab cov cua sov zoo thiab tiv taus hluav taws rau cov vaj huam sib luag rwb thaiv tsev.
• Cov polyethylene glycols ntshiab muab kev nplua nplua thiab kev tswj hwm antistatic thoob plaws ntau yam kev lag luam ua khoom.
• Cov potassium qis hauv cov khoom siv raw tiv thaiv cov tshuaj tsis xav tau thaum lub sijhawm tsim khoom hauv Hoobkas.

Nkag Siab Txog Cov Polyols Tshwj Xeeb Hauv Kev Lag Luam Chemistry

Cov Qauv Tshuaj ntawm Polyether thiab PEG Polymers

Kev tsim cov kws tshuaj polymercov polyols tshwj xeeblos tsim cov khoom siv txhim khu kev qha, ruaj khov. Lub qauv molecular vam khom rau kev rov ua dua ether txuas uas muab kev ua haujlwm flexural thiab lub zog dynamic. Cov tshuaj tiv thaiv pib nrog cyclic ethers tsim ntau yam saw hlau tsim rau cov qauv kev lag luam.

Kev xaiv ntawm polyether polyols thiab polyester polyols hloov pauv qhov tsis kam ntawm lub hauv paus tseem ceeb. Cov qauv Polyether muab kev tiv thaiv zoo dua rau hydrolytic cleavage hauv qhov chaw noo noo. Ntawm qhov tod tes, ester linkages hauv polyester polyols muab kev tiv thaiv kev puas tsuaj siab. MOFAN muab cov polyols ua tau zoo uas sib npaug cov tshuaj lom neeg ua haujlwm nrog kev ua haujlwm meej.

Lub Luag Haujlwm ntawm Polyols hauv Polyurethane Systems

Kev tsim cov polyurethane ua tau zoo nyob ntawm qhov ntxiv stoichiometric ntawm cov pab pawg hydroxyl nquag rau cov tshuaj ua haujlwm reactive. Qhov kev tshwm sim thawj zaug tshwm sim thaum pawg hydroxyl kawg ntsib cov molecule isocyanate. Cov kauj ruam no tsim cov kev sib txuas urethane muaj zog raws li cov saw polymer loj hlob.

hydroxyl pawg + isocyanate -> urethane linkage

Cov neeg tsim cov tshuaj sib xyaw ua ke cov polyols sib txawv nrog cov hom isocyanate tshwj xeeb los tswj cov npuas dej ntom ntom, cov polymer hardness, thiab thermal resistance. Cov kua nplaum sib xyaw ua ke xav tau cov nqi sib npaug ntawm cov tshuaj tiv thaiv kinetic kom tiv thaiv kev gelling ua ntej lub sijhawm ua tiav. Kev ntxiv cov khoom ntxiv crosslinking ua rau cov sijhawm kho sai dua thiab txhim kho qhov kawg cohesive toughness. MOFAN muab cov qib kev tshaj lij tshwj xeeb uas ua kom muaj kev ua tiav sib xws thoob plaws cov khoom siv tsim khoom tsis siv neeg.

Kev Faib Tawm Ua Haujlwm los ntawm Qhov Hnyav Molecular thiab Hydroxyl Number

Cov nqi Hydroxyl coj qhov ceev ntawm kev sib txuas thiab cov khoom siv lub cev ntawm cov thermoset network kho. Cov khoom ntxiv uas muaj qhov hnyav molecular tsawg muaj cov lej hydroxyl siab, tsim cov ntu polymer ruaj khov nrog cov qhov sib txuas nruj. Cov diols uas muaj qhov hnyav molecular siab muaj cov lej hydroxyl qis, ua rau cov ntu elastomeric mos uas tsim nyog rau cov sealants.

Kev xaiv cov lej hydroxyl tsim nyog tso cai rau cov engineers los kho qhov yooj ywm thiab tus cwj pwm tensile kom raug. Qhov hnyav molecular siab dua txo cov pawg urethane tag nrho hauv lub matrix. Qhov hnyav molecular qis dua ua rau cov ntsiab lus nyuaj nce, ua rau muaj kev tiv thaiv thermal thiab muaj peev xwm thauj khoom compressive. MOFAN tsim cov polyols kev tshaj lij thoob plaws qhov hnyav molecular dav dav kom ua tau raws li cov kev xav tau tsim khoom lag luam.

Cov Hom Tseem Ceeb thiab Cov Khoom Siv Lub Cev ntawm Polyether Formulations

Cov polyols tshwj xeeb muab cov cwj pwm ua tiav raws li qhov xav tau thiab lub neej ua haujlwm ntev thoob plaws cov ntawv thov tshuaj lom neeg hauv kev lag luam.Cov polyether polyolsmuaj cov pa oxygen txuas hauv lawv cov saw hlau molecular. Cov ether bonds no muab kev ruaj khov hydrolytic zoo heev hauv cov chaw ua haujlwm ntub dej. Cov kws ua haujlwm tshuaj feem ntau sib piv cov kab ke no nrog polyester polyols. Thaum polyester polyols muaj lub zog lub cev muaj zog, polyester polyols tsis muaj kev ruaj khov hydrolytic sib npaug. Polyester polyols lwj sai dua thaum raug rau cov dej noo tas li. MOFAN tsim cov qauv tshwj xeeb los tiv thaiv cov khoom sib xyaw dynamic tiv thaiv kev puas tsuaj dej thiab kev raug tshuaj lom neeg hnyav.

Cov Crosslinkers Muaj Peev Xwm Ua Haujlwm Siab thiab Cov Diols Qauv

Cov qauv polymer nyob ntawm kev tsim qauv molecular thawj zaug kom ua tiav cov khoom siv kho tshuab sib txawv. Cov crosslinkers ua haujlwm siab tsim cov tes hauj lwm peb-seem ntom ntom, thaum cov qauv diols tsim cov saw polymer linear ntev.

Cov Khoom Siv Txhim Kho Kev Sib Koom Tes thiab Kev Ua Kom Muaj Zog

Cov crosslinkers ua haujlwm siab ua rau muaj ntau qhov chaw hydroxyl reactive ib molecule. Hydroxyl functionality ntawm 2.0 thiab 4.0 ua rau crosslink density thaum lub sijhawm polymerization. Qhov crosslink density siab dua ncaj qha txhim kho lub zog sib koom ua ke, lub cev tawv, thiab tag nrho cov khoom siv kho tshuab. MOFAN muab PF-040, PF-450, thiab PF-1050 los ua kom zoo dua matrix cohesion. Cov additives no txhim kho kev tiv thaiv cua sov hauv ob-component adhesives, structural castings, thiab cov txheej txheem tiv thaiv hauv pem teb.

Cov Diols Siab-Elongation rau Cov Txheej Txheem Low-Modulus

Cov ntawv thov qis-modulus xav tau cov polymers linear nrog cov qhov hnyav molecular siab. Cov diols siab-molecular-weight xws li MOFAN PF-2080 thiab PF-2120 muab kev ywj pheej zoo kawg thiab kev ntev siab. Cov diols no txo ​​​​​​cov urethane concentration tag nrho raws li cov polymer backbone. Cov lej urethane qis dua tsim cov ntu mos uas khaws cov kev ywj pheej qis-kub mus txog -60 ° C. Cov neeg tsim cov qauv siv cov diols linear no los tsim cov sealants sib koom ua ke thiab cov polyurethane elastomers dynamic.

Cov Khoom Qhib Cell, Hydrophilic, thiab Cov Qib Siab Reactivity

Cov qib tshwj xeeb ntxiv hloov pauv cov qauv ua npuas ncauj sab hauv thiab cov kinetics ntawm qhov chaw. Kev ua haujlwm, cov nqi hydroxyl, thiab viscosity ua haujlwm ua cov ntsuas tseem ceeb los faib cov polyols tshwj xeeb no.

Qib qhib cell PF-3500 tiv thaiv kev ntsws ntawm cov khoom ua npuas dej uas tsis muaj zog. Qib hydrophilic PF-010 muaj cov pab pawg hydroxyl uas ua haujlwm tau zoo hauv cov hydrogels uas o. Qib siab PF-2802 ua rau lub zog tsim kua muag ntau ntxiv hauv cov khau molded. Cov polyols tshwj xeeb no tswj cov khoom siv lub cev ruaj khov thaum lub sijhawm ua haujlwm ceev ceev.

Aromatic thiab Novolac Polyols rau Flame Retardancy

Kev rwb thaiv cua sov ruaj khov xav tau kev ua haujlwm sai, lub zog ntawm cov qauv muaj zog, thiab kev tiv taus hluav taws kub heev. Cov polyols uas muaj ntxhiab tsw qab thiab novolac suav nrog cov nplhaib ntxhiab tsw qab rau hauv cov saw polymer tseem ceeb. Cov khoom zoo li MOFAN PF-800, PF-1380, thiab PF-585 muab kev ua haujlwm kub zoo dua piv rau cov polyols ib txwm muaj.

Cov polyols uas muaj ntxhiab tsw qab ua haujlwm zoo nrog cov pab pawg isocyanate thaum lub sijhawm ua cov tshuaj tsuag ua npuas ncauj. Cov polymer network uas tshwm sim tso tawm cov qauv polyphenolic tiv thaiv ntawm qhov kub siab. Cov tshuaj tiv thaiv no tsim cov txheej txheem char tiv thaiv thaum lub sijhawm raug cua sov. Cov pa roj carbon-carbon muaj zog muab kev tiv thaiv cua sov, kev tiv thaiv tshuaj lom neeg zoo heev, thiab kev tiv thaiv hluav taws kub hnyav. Cov ntawv thov kev lag luam vam khom cov khoom siv aromatic no rau cov vaj huam sib luag rwb thaiv tsev, cov laug cam polyisocyanurate, thiab cov polyurethane elastomers ntom ntom. Cov ntaub ntawv kawg muab lub neej ua haujlwm ntev, kev txhawb nqa cov qauv txhim khu kev qha, thiab kev tiv thaiv tshuaj lom neeg tas mus li hauv cov chaw ua haujlwm hnyav.

Cov Polyethylene Glycols Zoo Tshaj Plaws hauv Kev Ua Lag Luam

Kev Txheeb Xyuas Txog MOFAN PEG Cov Khoom Series

Polyethylene glycolua haujlwm ua cov polymers non-ionic uas muaj ntau yam kev lag luam thoob plaws ntau yam kev lag luam. MOFAN muab cov khoom tiav ntawm cov Polyethylene Glycols zoo tshaj plaws xws liPEG1000 to PEG20000Cov ntaub ntawv polyether linear no muaj cov pab pawg hydroxyl terminal. Cov chaw tsim khoom siv cov khoom no ua cov neeg sawv cev antistatic, cov roj nplua nyeem rau kev lag luam, cov neeg sawv cev tso tawm, thiab cov khoom siv raw. Cov txheej txheem tshuaj lom neeg vam khom cov saw hlau txhim khu kev qha no los tswj cov dej noo thiab lubricity hauv cov khoom tiav.

Cov neeg tsim cov qauv kev lag luam xaiv cov qib polyglycol tshwj xeeb raws li qhov ntev ntawm cov saw hlau thiab cov khoom ua haujlwm. Cov kev lag luam textile, ntawv, hlau ua haujlwm, roj hmab, thiab tshuaj siv cov tshuaj polyether no los txhim kho kev ua haujlwm zoo. Cov qib molecular qis dua muab kev daws teeb meem zoo heev thiab kev ua kom ntub dej. Cov qib molecular siab dua muab cov viscosity siab thiab muaj peev xwm khi tau zoo. MOFAN kho txhua qib tshuaj kom ua tau raws li cov lus qhia nruj ntawm cov khoom siv tsim khoom.

Cov Qauv Kev Huv Si thiab Kev Tswj Xyuas Potassium

Kev tsim tshuaj lom neeg yuav tsum tau ua kom huv si kom ntseeg tau tias cov tshuaj ua haujlwm rov ua dua. Cov khoom seem catalyst tsis xav tau xws li potassium ions cuam tshuam cov tshuaj lom neeg rhiab heev. MOFAN tswj cov potassium seem thaum lub sijhawm tsim khoom polycondensation. Kev tswj cov hlau tsis pom kev tiv thaiv cov tshuaj tiv thaiv thib ob tsis xav tau thaum lub sijhawm polyurethane polymer synthesis. Kev ua qias tuaj tsawg kawg nkaus ntawm ionic tswj cov kua viscosity ruaj khov thaum lub sijhawm khaws cia.

Cov qib kev ua haujlwm siab-purity txo cov teeb meem ntawm cov qauv hauv cov qauv siv kawg. Cov txheej txheem kev lees paub purity kuaj txhua pawg khoom kom paub meej cov tshuaj lom neeg sib xyaw thiab tswj cov qauv zoo nruj. Cov kev xaiv qib USP/NF ua tau raws li cov lus qhia ntawm Tebchaws Meskas Pharmacopeia monograph rau cov khoom kho mob zoo. Cov ntaub ntawv ua raws li tag nrho nrog cov qib tshuaj kom muab kev taug qab tag nrho. Kev muaj USP/NF, Khoom noj (E1521), thiab cov qib kev ua haujlwm cia cov engineers xaiv qib purity kom raug rau cov kev xav tau ntawm daim ntawv thov.

Cov Qauv Lub Cev Los Ntawm Cov Kua Mus Rau Cov Hmoov

Qhov hnyav ntawm cov polyglycol txiav txim siab nws lub cev lub cev thaum sov li chav. Cov saw polymer luv dua tseem yog cov kua dej, thaum cov saw ntev dua khov ua cov khoom khov lossis hmoov.

Cov neeg tsim cov tshuaj xaiv cov qauv lub cev kom zoo tshaj plaws rau kev tswj cov txheej txheem tsim khoom. Cov hmoov uas tau sib tsoo ntws tau yooj yim los ntawm cov hoppers qhuav uas tsis siv neeg. Cov qauv kua sib xyaw tam sim ntawd rau hauv cov dej tshuaj uas tsis muaj cua sov nkag. Cov nplaum semi-solid muab cov qauv tshuaj pleev kom du hauv kev npaj tshuaj. MOFAN muab cov qauv lub cev sib xws los ua kom yooj yim rau kev sib xyaw tshuaj hauv kev lag luam.

Cov Kev Siv Hauv Kev Lag Luam ntawm Polyether thiab PEG Systems

Cov Khoom Siv Polyurethane Adhesives, Sealants, thiab Coatings

Cov neeg tsim qauv xaivcov polyols tshwj xeeblos tsim cov nplaum ua haujlwm siab, cov khoom siv foob, cov tshuaj tiv thaiv, thiab cov khoom siv castings. Hauv CASE systems, di-functional thiab tri-functional polyols tsim cov tes hauj lwm elastic nrog kev coj cwj pwm kho kom paub tseeb. Cov neeg tsim qauv feem ntau teev cov polyether diol thiab triol polyols nrog qhov hnyav molecular ntawm 1000 txog 3000 rau cov ntaub ntawv polyurethane uas tsis yog ua npuas ncauj. Cov khoom siv ua haujlwm no tsim cov dynamic urethane bonds uas tswj lub zog nyob rau hauv kev ntxhov siab rov ua dua.

Cov polyether polyols ib qho chaw muab kev ruaj khov hydrolytic zoo dua piv rau polyester chemistry hauv cov chaw ua haujlwm noo noo. Cov kua polyether qib khaws cia kev ywj pheej ntawm qhov kub qis dua xoom vim tias lawv muaj qhov kub hloov iav qis. Piv txwv li, polypropylene glycol qib qhia cov nqi hloov iav ze li ntawm -60 ° C. Poly (tetramethylene ether) glycol muab qhov kub hloov iav qis dua -75 ° C. Cov khoom ua tau zoo no tiv thaiv kev tawg ntxov ntxov hauv cov sealant sib koom ua ke sab nraud. Cov txheej txheem hauv pem teb kev lag luam siv cov polyols ua haujlwm siab los ua kom muaj kev sib txuas ntau ntxiv. Kev sib txuas ntau dua tsim cov nplaim ntom uas tiv taus cov tshuaj lom neeg thiab kev puas tsuaj. Tsis tas li ntawd, cov nplaum ob-component vam khom cov resins qis-viscosity rau kev ntub dej sai. Cov kab ke reactive no tsim cov kev sib txuas urethane resilient uas khi cov hlau, yas, thiab cov khoom sib xyaw ua ke kom ruaj ntseg. Cov polyurethane elastomers tshwj xeeb muab kev ywj pheej rov qab siab hauv cov log tsheb lag luam thiab cov khau microcellular. Tsis tas li ntawd, cov qauv kev cai rau polyurethane elastomers muab kev tiv thaiv kev tsim kua muag tshwj xeeb hauv qab cov khoom hnyav dynamic.

Cov Ua Npuas Ncauj Rwb Thaiv Kub Uas Muaj Kev Ywj Pheej, Muaj Kev Ruaj Khov Siab, thiab Rigid

Kev tsim ua npuas ncauj vam khom kev sib phim hydroxyl functionality thiab saw ntev rau cov kev cai tshwj xeeb. Kev tsim ua npuas ncauj mos mos siv cov polyols ntev-saw nrog kev ua haujlwm qis ntawm 2 thiab 3. Cov neeg tsim qauv xaiv cov polyols tshwj xeeb nrog cov qhov hnyav molecular ntawm 2000 txog 7000 los tsim cov qauv cellular yooj ywm rau cov rooj tog zaum cushioning thiab cov khoom siv pw. Cov npuas dej siab-resilience sib xyaw ua ke cov polymers tshwj xeeb reactive los txhim kho lub peev xwm thauj khoom thiab cell rebound. Cov qauv mos mos thiab hypersoft xav tau cov khoom ntxiv cell-qhib kom sib npaug lub siab pneumatic sab hauv thiab tiv thaiv cov npuas dej shrinkage tom qab molding. Cov ntawv thov sab hauv tsheb siv cov txheej txheem yooj ywm kev cai los tsim cov rooj zaum tsheb xis nyob, armrests, headrests, thiab cov txheej txheem acoustic rwb thaiv tsev.

Cov ua npuas ncauj rwb thaiv tsev kub uas ruaj khov xav tau cov theem sib txuas siab dua kom ua tiav cov qauv ruaj khov thiab qhov ntev ruaj khov nyob rau hauv cov khoom siv thermal. Cov neeg tsim qauv siv cov polyols nrog cov nqi ua haujlwm siab dua 3 thiab cov lej hydroxyl siab. Qhov ceev ntawm qhov sib txuas siab tsim cov qauv kaw-cell uas ntes cov pa roj rwb thaiv tsev sab hauv cov polymer matrix ruaj khov. Cov qauv cell nruj no muab kev ruaj khov hydrolytic mus sij hawm ntev hauv cov xwm txheej sab nraum zoov. Cov qhov loj me ntawm cell zoo dua txhim kho lub zog compressive thaum khaws cov thermal conductivity qis hauv cov vaj huam sib luag rwb thaiv tsev lag luam. Cov tsheb thauj khoom txias, cov khoom siv lag luam, thiab cov tshuaj tsuag rwb thaiv tsev vam khom cov txheej txheem polyurethane ruaj khov los tiv thaiv kev hloov pauv cua sov. Cov haujlwm tsim kho teeb tsa cov vaj huam sib luag polyisocyanurate prefabricated kom txo qis kev siv hluav taws xob hauv tsev. Cov ua npuas ncauj ruaj khov kuj muab cov kev daws teeb meem ntim khoom rau cov khoom siv hluav taws xob uas yooj yim puas tsuaj.

Cov Ntawv Thov PEG hauv Cov Ntaub, Roj Hmab, thiab Tshuaj

Cov polymers polyethylene glycol ua haujlwm ua cov khoom siv pabcuam ua cov khoom siv tsis-ionic uas siv tau ntau yam hauv ntau yam kev lag luam. Cov qib sib txawv ntawm qhov hnyav molecular muab cov yam ntxwv ua haujlwm sib txawv hauv kev ua haujlwm tsim khoom.

• Kev Ua Ntaub Ntawv:Cov qib kua xws li PEG-200 ua haujlwm ua cov khoom ua kom mos thiab cov neeg sawv cev tiv thaiv hluav taws xob. Cov qib nruab nrab xws li PEG-400, 600, thiab 800 ua haujlwm ua cov roj nplua nyeem thiab cov neeg sawv cev ntub thaum lub sijhawm ua tiav cov fiber. Cov kev xaiv hnyav dua xws li PEG-4000 ua haujlwm ua cov khoom yas nplaum thiab cov khoom ua kom mos.
• Kev Tsim Khoom Siv Roj Hmab:PEG-1000 thiab 1500 ua haujlwm ua cov tshuaj dispersants uas txhawb kev ua kom vulcanization zoo thiab kev sib kis carbon dub. Cov qib khov kho xws li PEG-4000 thiab 8000 ua haujlwm ua cov neeg sawv cev tso pwm, roj nplua nyeem, thiab cov dej txias zoo.
• Cov Qauv Tshuaj:Cov polyols uas yaj tau hauv dej ua haujlwm ua cov khoom siv pabcuam thiab cov khoom siv nruab nrab hauv cov khoom kho mob. Cov khoom siv raw no ua rau cov tshuaj yaj tau zoo, ua haujlwm tau zoo, thiab ua tau zoo hauv kev siv tshuaj noj thiab tshuaj pleev.

Cov txheej txheem ua hlau hauv kev lag luam vam khom polyethylene glycols rau kev txias, lubrication, thiab hloov cua sov. Cov chaw tsim ntawv siv cov tshuaj polyglycol los tswj kev khaws cia dej noo thiab txhim kho qhov du ntawm qhov chaw. Cov tshuaj ntxiv no muab kev ruaj khov tshuaj thoob plaws cov chaw ua kua qaub thiab alkaline. Cov haujlwm niaj hnub no xaiv cov qhov hnyav polymer tshwj xeeb los ua kom zoo dua qhov ceev ntawm kev ua thiab qhov zoo ntawm cov khoom.

Cov Qauv Xaiv rau MOFAN Cov Polyols Tshwj Xeeb

Kev Sib Txuas Hydroxyl Cov Nqi thiab Kev Ua Haujlwm rau Cov Kev Xav Tau ntawm Daim Ntawv Thov

Kev xaiv polyol zoo yuav tsum tau sib phim cov lej hydroxyl thiab kev ua haujlwm kom tsom mus rau cov ntsuas lub cev. Kev ua haujlwm txiav txim siab qhov sib txuas ntawm cov qauv kho network. Cov nqi Hydroxyl ntsuas qhov concentration ntawm qhov chaw hydroxyl nquag ib chav tsev loj. Cov nqi hydroxyl qis nrog kev ua haujlwm ntawm 2 thiab 3 tsim cov tes hauj lwm elastic. Cov nqi hydroxyl siab dua nrog kev ua haujlwm ntawm 4 thiab 8 tsim cov qauv thermoset nruj. Cov neeg tsim qauv ntsuas cov ntsuas no kom sib npaug cov khoom siv kho tshuab kawg. Piv txwv li, polyether polyol nrog tus nqi hydroxyl ntawm 150 mg KOH / g thiab tus lej nruab nrab molecular hnyav ntawm 1200 g / mol qhia txog kev ua haujlwm ze li ntawm 3.2. Cov neeg tsim qauv siv qib tshwj xeeb no los tsim cov vaj huam sib luag ua npuas ncauj semi-rigid rau cov vaj huam sib luag sab hauv tsheb.

Kev Txhim Kho Viscosity, Reactivity, thiab Curing Kinetics

Kev ua tiav ntawm kev ua tiav nyob ntawm tus cwj pwm ntws thiab qhov ceev ntawm kev kho. Kev xaiv cov kua polyols nrog cov qhov hnyav molecular tsim nyog tswj cov viscosity ntawm lub hauv paus. Cov neeg tsim cov qauv ntxiv cov calcium carbonate precipitated ntawm 20-40 wt.% loading los tsim kom muaj kev tiv thaiv sag. Tsis tas li ntawd, ntxiv fumed silica ntawm 2-5 wt.% loading muab cov cwj pwm thixotropic muaj zog los tiv thaiv sagging ntawm cov substrates ntsug. Synthesizing prepolymers nrog isocyanate rau hydroxyl piv ntawm 1.8: 1 thiab 2.5: 1 pab tswj lub cev viscosity. Kev xaiv polyol ceev faj ua kom yooj yim rau kev tuav dynamic thoob plaws cov khoom siv dispensing tsis siv neeg.

Cov tshuaj catalysts Organotin xws li DBTDL ntawm 0.01-0.1 wt.% loading tsim kom muaj qhov nrawm ntawm kev ua tshuaj tiv thaiv. Cov tshuaj ntxiv no txhawb nqa kev tsim urethane kom ruaj ntseg qhov chaw tsis muaj tack hauv 30 txog 90 feeb. Cov tshuaj catalysts tertiary amine xws li ua kom cov qauv kho sai dua hauv cov kab ke polyurethane. Kev sib phim cov tshuaj catalysts nquag nrog cov polyols ua tau zoo tiv thaiv kev tsim void hauv cov khoom pwm tuab.

Txhim Kho Kev Ruaj Ntseg Thermal thiab Kev Tiv Thaiv Ib puag ncig

Kev xaiv pob txha caj qaum tswj hwm qhov ruaj khov hydrolytic thiab kev tiv thaiv tshuaj lom neeg mus sij hawm ntev. Polyether polyols tswj tau qhov ruaj khov hydrolytic zoo heev, kav ntev tshaj 2000 teev ntawm 95% qhov av noo thiab 70 ° C yam tsis muaj kev poob khoom tseem ceeb. Ntawm qhov tod tes, polyester polyols lwj sai dua hauv qab av noo siab vim tias dej noo tawm tsam ester linkages. Kev xaiv lwm cov polyols es tsis txhob polyester polyols txhim kho kev tiv thaiv dej hauv polyurethane elastomers. Cov polyols tshwj xeeb muab kev tiv thaiv tshuaj lom neeg zoo heev hauv cov chaw ua haujlwm nyuaj. Cov polybutadiene polyols tshwj xeeb khaws cia ntau tshaj 98.5% pawg thaum lub sijhawm raug tas mus li ntawm 100 ° C rau 1000 teev, khaws cov elastic modulus variation hauv qab 100%.

Cov pob txha caj qaum uas muaj ntxhiab tsw qab muab kev ruaj khov thermal kom tiv taus cov cua sov siab los ntawm cov hom isocyanate uas tsis tau ua haujlwm. Cov kev xaiv aliphatic tiv thaiv kev hloov pauv UV hnyav. Cov neeg tsim cov tshuaj ntxiv cov tshuaj antioxidants ntawm 0.5–1.5 wt% los txhim kho kev tiv thaiv oxidative mus sij hawm ntev. Ntxiv cov tshuaj stabilizers UV ntawm 0.5–2.0 wt% tiv thaiv cov ntaub ntawv sab nraud tiv thaiv kev puas tsuaj los ntawm lub hnub ci. Kev xaiv polyol kom raug ua kom ntseeg tau tias cov polyols tshwj xeeb tshwj xeeb khaws cov khoom polyurethane tseem ceeb thoob plaws ntau yam kev siv sab nraum zoov.

MOFAN cov polyols tshwj xeebthiab cov polyethylene glycol series zoo tshaj plaws xa cov txiaj ntsig tseem ceeb thoob plaws kev tsim kho polymer niaj hnub. Cov qauv molecular meej meej tso cai rau polyols los ua kom zoo dua qhov kev ua haujlwm ntawm cov tshuaj tiv thaiv thiab lub zog ntawm lub network. Cov khoom siv kho kom haum ncaj qha txhim kho cov khoom ua tau zoo hauv polyurethane adhesives, structural sealants, dynamic elastomers, thiab cov ua npuas thermal rwb thaiv tsev. Cov neeg tsim qauv tsim kom muaj kev tiv thaiv tshuaj zoo dua, kev ruaj khov thermal, thiab kev ua haujlwm ntev los ntawm kev tswj hwm kev ua haujlwm chemistry. Kev ua haujlwm hauv kev lag luam ua tiav kev ua haujlwm siab dua nrog cov tshuaj purity siab no thoob plaws ntau yam kab ua haujlwm. Cov neeg siv khoom lag luam raug caw tuaj sab laj nrog MOFAN cov kws tshaj lij los tsim cov qauv kev cai, daws cov hom phiaj ua haujlwm nruj, thiab tau txais kev txhawb nqa rau cov kev xav tau tsim khoom nyuaj.

Cov Lus Nug Feem Ntau