Kwikhemistri yepolymer, iipolyols ezikhethekileyo zisebenza njengeebhloko zokwakha ezibalulekileyo. Amaqela eHydroxyl asabela kunye nee-isocyanates ukwenza unxibelelwano oluqinileyo lwe-urethane. I-MOFAN ivelisa uthotho lwe-polyether yobuchwephesha kunye ne-polyethylene glycols ephezulu (PEG) kwiinkqubo zemizi-mveliso. Iinjineli zeekhemikhali zisebenzisa ezi nxalenye kwi-insulation eqinileyo, i-foam eguquguqukayo, kunye ne-polyurethane elastomers.

Olu kukhula lubonisa ubungakanani boqoqosho lwee-polyols kuyo yonke imveliso yemizi-mveliso.

Izinto ezibalulekileyo ekufuneka ziqwalaselwe

• Iipolyols ezikhethekileyoYenza unxibelelwano oluqinileyo lwe-urethane kunye ne-isocyanates ukwenza ii-polyurethanes ezisebenza kakuhle.
• Iipolyether polyols ziyamelana nomonakalo wamanzi ngcono kunepolyester polyols kwiindawo ezimanzi.
• Iipolyols ezisebenzayo kakhulu zonyusa uxinano lwe-crosslink ukuze zonyuse ubulukhuni bezinto kunye nokumelana nobushushu.
• Ii-diols ezinobunzima obuphezulu zinciphisa inani le-urethane ukugcina ii-sealants ziguquguquka kumaqondo obushushu angaphantsi kwe-zero.
• Iipolyols ezinevumba elimnandi zibonelela ngokumelana nobushushu okunamandla kunye nokungatshisi ilangabi kwiiphaneli zokukhusela ubushushu eziqinileyo.
• Iiglycol zepolyethylene ezicocekileyo zibonelela ngokuthambisa okuthambileyo kunye nolawulo oluchasene ne-static kumashishini ahlukeneyo okucubungula.
• Amanqanaba aphantsi e-potassium kwizinto eziluhlaza athintela ukusabela okungafunekiyo kweekhemikhali ngexesha lokuveliswa kwemveliso yefektri.

Ukuqonda iiPolyols ezikhethekileyo kwiKhemistri yezeShishini

Ulwakhiwo lweekhemikhali zePolyether kunye neePEG Polymers

Uyilo lweekhemistri zepolymeriipolyols ezikhethekileyoukwakha izinto ezinokuthenjwa nezihlala ixesha elide. Uyilo lweemolekyuli luxhomekeke ekudibaneni kwe-ether okuphindaphindiweyo okubonelela ngokunyamezela kwe-flexural kunye namandla aguqukayo. Abaqalisi abasabelayo ngee-cyclic ethers badala imixokelelwane eyahlukeneyo eyenzelwe iifomyula zoshishino.

Ukukhetha phakathi kwe-polyether polyols kunye ne-polyester polyols kutshintsha kakhulu ukumelana nomqolo. Izakhiwo ze-polyether zibonelela ngokumelana okuphezulu kwi-hydrolytic cleavage kwiindawo ezifumileyo. Ngokwahlukileyo koko, unxibelelwano lwe-ester kwi-polyester polyols lubonelela ngokumelana okuphezulu kokukrala koomatshini. I-MOFAN inikezela nge-polyols yokusebenza elinganisela ukunyamezela kweekhemikhali kunye nokuziphatha okuchanekileyo kokucubungula.

Indima yePolyols kwiinkqubo zePolyurethane

Ukwenziwa kwe-polyurethane esebenza kakuhle kuxhomekeke ekongezweni kwe-stoichiometric kwamaqela e-hydroxyl asebenzayo kwiikhompawundi ezisebenzayo ezisebenzayo. Impendulo ephambili yenzeka xa iqela le-terminal hydroxyl lidibana nemolekyuli ye-isocyanate. Eli nyathelo lenza unxibelelwano oluqinileyo lwe-urethane ecaleni kwetyathanga le-polymer elikhulayo.

iqela le-hydroxyl + isocyanate -> urethane linkage

Ii-formulators zidibanisa ii-polyol ezahlukeneyo kunye neentlobo ezithile ze-isocyanate ukulawula uxinano lwe-foam, ubulukhuni be-polymer, kunye nokumelana nobushushu. Iingxube ze-resin yolwelo zifuna amazinga okuphendula kwe-kinetic alinganayo ukuthintela i-gelling yangaphambi kwexesha ngexesha lokucubungula. Ukongeza izongezo ze-crosslinking kukhawulezisa iishedyuli zokulungisa kwaye kuphucula ubulukhuni bokugqibela obudibeneyo. I-MOFAN inikezela ngamanqanaba obuchwephesha akhethekileyo aqinisekisa ukucutshungulwa okuqhubekayo kwizixhobo zemveliso ezenzekelayo.

Ulwahlulo oluSebenzayo ngokweSisindo seMolekyuli kunye neNombolo yeHydroxyl

Amaxabiso e-hydroxyl alawula uxinano oludibanisayo kunye neempawu zomzimba zenethiwekhi ze-thermoset eziphilisiweyo. Izongezo ezinobunzima obuphantsi beemolekyuli zinenani eliphezulu le-hydroxyl, nto leyo edala iinxalenye ze-polymer eziqinileyo ezinobunzima obuqinileyo be-crosslink. Ii-diols ezinobunzima obukhulu beemolekyuli zinenani eliphantsi le-hydroxyl, nto leyo evelisa iinxalenye ezithambileyo ze-elastomeric ezifanelekileyo kwii-sealants.

Ukukhetha amanani afanelekileyo e-hydroxyl kuvumela iinjineli ukuba zilungise ukuguquguquka koomatshini kunye nokuziphatha kokuxinana ngokuchanekileyo. Ubunzima obuphezulu beemolekyuli buyanciphisa uxinano lweqela le-urethane ngokubanzi kwi-matrix. Ubunzima obuphantsi beemolekyuli buyandisa umxholo wecandelo eliqinileyo, bunyusa ukumelana nobushushu kunye nomthamo womthwalo oxinzelelweyo. I-MOFAN ivelisa ii-polyol zobugcisa kuzo zonke iimolekyuli ezibanzi ukuze ihlangabezane neemfuno zokuvelisa eziqinileyo.

Iintlobo eziphambili kunye neempawu ezibonakalayo zePolyether Formulations

Iipolyols ezikhethekileyo zibonelela ngendlela yokucubungula eyenzelwe wena kunye nobomi benkonzo ehlala ixesha elide kuzo zonke izicelo zeekhemikhali zoshishino.Iipolyol zePolyetherZine-oxygen links kwii-molecular chains zazo. Ezi ether bonds zibonelela ngozinzo oluhle kakhulu lwe-hydrolytic kwiindawo zokucubungula ezimanzi. Iinjineli zeekhemikhali zihlala zithelekisa ezi nkqubo neepolyester polyols. Ngelixa iipolyester polyols zibonelela ngokuqina okuqinileyo komzimba, iipolyester polyols azinawo uzinzo olulinganayo lwe-hydrolytic. Iipolyester polyols ziwohloka ngokukhawuleza xa zivezwa kumswakama ongaguqukiyo. I-MOFAN iyila iifomyula ezikhethekileyo zokukhusela izinto ezinamandla ekuwohlokeni kwamanzi nasekuchaphazelekeni kakhulu kweekhemikhali.

Ii-Crosslinkers eziSebenza ngokuPhezulu kunye neeDiols zeSakhiwo

Izakhiwo zePolymer zixhomekeke kuyilo lwemolekyuli yokuqala ukuze kufezekiswe iipropati ezahlukeneyo zoomatshini. Ii-crosslinkers ezisebenzayo eziphezulu zakha iinethiwekhi ezixineneyo ezinemilinganiselo emithathu, ngelixa ii-diols zesakhiwo zenza imixokelelwane ye-polymer ethe tyaba.

Izinto zokuqinisa amandla oBumbano kunye noomatshini

Ii-crosslinkers ezisebenzayo kakhulu zonyusa inani leendawo ze-hydroxyl ezisebenzayo kwi-molecule nganye. Ukusebenza kwe-hydroxyl phakathi kwe-2.0 kunye ne-4.0 kunyusa uxinano lwe-crosslink ngexesha le-polymerization. Uxinano oluphezulu lwe-crosslink luphucula ngokuthe ngqo amandla okubambisana, ubulukhuni bomzimba, kunye neempawu zoomatshini ngokubanzi. I-MOFAN ibonelela nge-PF-040, i-PF-450, kunye ne-PF-1050 ukuze kuphuculwe umanyano lwe-matrix. Ezi zongezo zonyusa ukumelana nobushushu kwi-adhesives ezinamacandelo amabini, ii-castings zesakhiwo, kunye neengubo zomgangatho ezikhuselayo.

IiDiols eziNcinci zokuLungiselela iiNkqubo zeModulus eziPhantsi

Ukusetyenziswa kweemodulus ezisezantsi kufuna iipolymers ezithe ngqo ezinobunzima obuphezulu beemolekyuli. Iidiols ezinobunzima beemolekyuli eziphezulu ezifana neMOFAN PF-2080 kunye nePF-2120 zibonelela ngokuguquguquka okumangalisayo kunye nobude obuphezulu. Ezi diols zesakhiwo zinciphisa uxinzelelo lwe-urethane iyonke kumqolo wepolymer. Inani eliphantsi lamaqela e-urethane livelisa amacandelo athambileyo agcina ukuguquguquka okuphantsi kobushushu ukuya kuthi ga kwi--60°C. Iiformulators zisebenzisa ezi diols ezithe ngqo ukuvelisa ii-joint sealants kunye ne-dynamic polyurethane elastomers.

Ii-Openers zeSeli, ii-Hydrophilic, kunye nee-High-Reactivity Grades

Amanqanaba okongeza okukhethekileyo okukhethekileyo aguqula izakhiwo zangaphakathi zeeseli zefoam kunye ne-kinetics yokusabela komphezulu. Ukusebenza, amaxabiso e-hydroxyl, kunye ne-viscosity zisebenza njengeemilinganiselo eziphambili zokwahlula ezi polyols ezikhethekileyo.

Ibanga lokuvula iiseli i-PF-3500 lithintela ukushwabana komoya kwiifoam ezithambileyo ezinobunzima obuphantsi. Ibanga le-hydrophilic PF-010 liqulathe amaqela e-hydroxyl asebenzayo asebenza kakuhle kwii-hydrogels ezifutha amanzi. Ibanga le-PF-2802 elinokusabela okuphezulu lonyusa amandla okukrazula kwiintsiba zezihlangu ezibunjiweyo. Ezi polyols ezikhethekileyo zigcina iipropati zomzimba ezizinzileyo ngexesha lemijikelo yemveliso ekhawulezayo.

IiPolyols ezinevumba elimnandi kunye neNovolac zokuthintela ilangatye

Ukufakwa kobushushu obuqinileyo kufuna isantya esikhawulezayo sokucubungula, amandla aqinileyo olwakhiwo, kunye nokunyamezela umlilo okunzima. Iipolyols ezisekelwe kwivumba elimnandi kunye ne-novolac zifaka iiringi zevumba elimnandi kwikhonkco eliphambili le-polymer. Iimveliso ezifana ne-MOFAN PF-800, PF-1380, kunye ne-PF-585 zibonelela ngokusebenza okuphezulu kobushushu xa kuthelekiswa neepolyols eziqhelekileyo.

Iipolyols ezinuka kamnandi zisabela kakuhle namaqela asebenzayo e-isocyanate ngexesha lokucubungula i-spray foam. Inethiwekhi yepolymer ephumayo ikhupha izakhiwo ze-polyphenolic ezikhuselayo kumaqondo obushushu aphezulu. Le mpendulo yekhemikhali yenza umaleko we-char okhuselayo ngexesha lokuvezwa kubushushu. Iibhondi ze-carbon-carbon eziqinileyo zibonelela ngokumelana nobushushu, ukumelana okugqwesileyo kweekhemikhali, kunye nokungalali kakuhle komlilo. Ukusetyenziswa kwemizi-mveliso kuxhomekeke kwezi bhloko zokwakha ze-aromatic kwiiphaneli zokufakelwa eziqinileyo, iibhodi ze-polyisocyanurate, kunye ne-dense polyurethane elastomers. Izixhobo zokugqibela zibonelela ngobomi obude benkonzo, inkxaso yesakhiwo ethembekileyo, kunye nokumelana okuqhubekayo kweekhemikhali kwiindawo zoshishino ezinobundlobongela.

IiGlycols zePolyethylene eziBalaseleyo kwiMishini yokuSebenza

Isishwankathelo se-MOFAN PEG Product Series

I-polyethylene glycolszisebenza njengee-polymers ezingezizo ii-ionic eziguquguqukayo kumashishini ahlukeneyo okucubungula. I-MOFAN ibonelela ngothotho olupheleleyo lweePolyethylene Glycols eziphezulu ukusuka kwiI-PEG1000 to I-PEG20000Ezi zinto ze-polyether ezithe ngqo ziqulathe amaqela e-terminal hydroxyl asebenzayo. Abavelisi basebenzisa ezi mveliso njengee-antistatic agents, ii-lubricants zoshishino, ii-releasing agents, kunye ne-raw material intermediates. Iinkqubo zeekhemikhali zixhomekeke kwezi tyathanga zithembekileyo ukulawula ukugcinwa komswakama kunye nokuthamba kwiimveliso ezigqityiweyo.

Iifomyula zoshishino zikhetha amanqanaba athile e-polyglycol ngokusekelwe kubude beetyathanga ezifunekayo kunye neempawu zokusebenza. Amashishini elaphu, amaphepha, okusebenza ngesinyithi, eerabha, kunye namayeza asebenzisa la makhompawundi e-polyether ukuphucula ukusebenza kakuhle kokucubungula. Amanqanaba aphantsi obunzima be-molecular abonelela nge-solvency egqwesileyo kunye nesenzo sokumanzisa. Amanqanaba aphezulu obunzima be-molecular anika i-viscosity ephezulu yomzimba kunye nokukwazi ukubopha okuqinileyo. I-MOFAN ilungelelanisa amanqanaba eekhemikhali nganye ukuze yanelise iinkcukacha ezingqongqo zomzimba kwizixhobo zokwenza ezizenzekelayo.

Imigangatho yoBumsulwa kunye noLawulo lwePotassium

Ukwenziwa kweekhemikhali kufuna ubumsulwa obuqinileyo bezinto eziluhlaza ukuqinisekisa amazinga okuphendula kwebatch aphindaphindwayo. Iintsalela ze-trace catalyst ezingafunekiyo ezifana nee-ion ze-potassium ziphazamisa ukusabela kweekhemikhali okubuthathaka. I-MOFAN ilawula amanqanaba e-potassium aseleyo ngexesha leenkqubo zokwenziwa kwe-polycondensation. Ukulawula amanqanaba e-trace metal kuthintela ukusabela okungafunekiyo kwesibini ngexesha lokwenziwa kwe-polyurethane polymer. Ungcoliseko oluncinci lwe-ionic lugcina i-viscosity yolwelo ezinzileyo ngexesha lokugcina.

Amanqaku obuchwephesha obucocekileyo kakhulu anciphisa iziphene zesakhiwo kwiifomyula zokusetyenziswa kokugqibela. Iiprotokholi zokuqinisekisa ubumsulwa zivavanya yonke ibhetshi yemveliso ukuqinisekisa ukwakheka kweekhemikhali kunye nokugcina imigangatho engqongqo yomgangatho. Iinketho zebanga le-USP/NF ziyahlangabezana neenkcukacha ze-monograph ze-United States Pharmacopeia zeemveliso zonyango ezibuthathaka. Amaxwebhu apheleleyo okuthobela imithetho ahamba namanqaku amayeza ukubonelela ngokulandelela okupheleleyo kwebhetshi. Ukufumaneka kwe-USP/NF, i-Food (E1521), kunye namanqaku obuchwephesha kuvumela iinjineli ukuba zikhethe inqanaba elifanelekileyo lobumsulwa kwiimfuno zesicelo esichanekileyo.

Iifom ezibonakalayo ukusuka kulwelo ukuya kwiMigubo

Ubunzima bemolekyuli ye-polyglycol bumisela imeko yayo yomzimba kubushushu begumbi. Iitsheyini ze-polymer ezimfutshane zihlala zilulwelo olumanzi, ngelixa iitsheyini ezinde ziqina zibe zizinto eziqinileyo okanye iipowders ezifana newax.

Ii-formulators zikhetha iifom ezibonakalayo ukuze ziphucule iindlela zokuphatha imveliso. Iipowder ezisikiweyo zihamba ngokukhululekileyo kwii-hoppers ezizenzekelayo zokuxuba ezomileyo. Iifom zolwelo zixubana ngoko nangoko kwimijelo yamanzi eekhemikhali ngaphandle kokufaka ubushushu. Iipaste eziqinileyo zibonelela nge-ointment textures egudileyo ekulungiseleleni amayeza. I-MOFAN ibonelela ngeefom ezibonakalayo ezifanayo ukuze kube lula ukuxuba iikhemikhali zoshishino.

Izicelo zemizi-mveliso zePolyether kunye neeNkqubo zePEG

Izincamathelisi zePolyurethane, Izitywini, kunye neeCoatings

Khetha iifomulaiipolyols ezikhethekileyoukwenza ii-adhesives ezisebenza kakuhle, ii-sealants, ii-protective coatings, kunye ne-structural castings. Kwiinkqubo ze-CASE, ii-polyols ezisebenza ngokudibeneyo kunye nezisebenza ngokuthathu zakha iinethiwekhi ze-elastic ezineendlela zokuphilisa ezinokuqikelelwa. Ii-formulators zihlala zichaza ii-polyether diol kunye ne-triol polyols ezinobunzima beemolekyuli ukusuka kwi-1000 ukuya kwi-3000 kwizixhobo ze-polyurethane ezingezo-foam ezithambileyo. Ezi bhloko zokwakha ezisebenzayo zenza ii-dynamic urethane bonds ezigcina amandla phantsi koxinzelelo oluphindaphindwayo loomatshini.

Iipolyol zepolyether ezisebenzisa umthombo omnye zibonelela ngozinzo oluphezulu lwe-hydrolytic xa kuthelekiswa ne-polyester chemistry kwiindawo zokucubungula ezimanzi. Iiklasi zepolyether ezingamanzi zigcina ukuguquguquka kumaqondo obushushu angaphantsi kwe-zero kuba zinobushushu obuphantsi bokutshintsha kweglasi. Umzekelo, iiklasi zepolypropylene glycol zibonisa amaxabiso okutshintsha kweglasi akufutshane ne--60°C. I-poly(tetramethylene ether) glycol inika amaqondo obushushu okutshintsha kweglasi asezantsi ukuya kwi--75°C. Ezi mpawu zokusebenza zithintela ukuqhekeka kwangaphambi kwexesha kwiisealants zangaphandle zamalungu. Iingubo zomgangatho wemizi-mveliso zisebenzisa iipolyols ezisebenzayo eziphezulu ukwandisa uxinano lwe-crosslink. Ukudibanisa okuphezulu kudala iindawo ezixineneyo ezimelana nokuchitheka kweekhemikhali okunamandla kunye nokukrala koomatshini. Ukongeza, izincamathelisi ezinamacandelo amabini zixhomekeke kwiiresini ezixineneyo eziphantsi ukuze kumanziswe ngokukhawuleza kumphezulu. Ezi nkqubo zisabelayo zenza ii-reliable urethane linkages ezibopha iintsimbi, iiplastiki, kunye nezinto ezidityanisiweyo ngokukhuselekileyo. Ii-polyurethane elastomers ezikhethekileyo zibonelela ngokuqina okuphezulu kokubuyela umva kumavili emizi-mveliso kunye neenyawo zezihlangu ezincinci. Ngaphezu koko, iifomyula ezenziwe ngokwezifiso ze-polyurethane elastomers zibonelela ngokumelana okungaqhelekanga kokukrazula phantsi kwemithwalo enzima enamandla.

Amagwebu okukhusela aguquguqukayo, aqinileyo, kwaye aqinileyo

Ukwenziwa kwefoam kuxhomekeke ekuhambelaniseni ukusebenza kwe-hydroxyl kunye nobude betsheyini neemfuno ezithile zobugcisa. Ukuveliswa kwefoam ye-slabstock ethambileyo kusebenzisa ii-polyols zetsheyini ende ezinobunzima obuphantsi phakathi kwe-2 kunye ne-3. Ii-formulators zikhetha ii-polyols ezikhethekileyo ezinobunzima beemolekyuli ukusuka kwi-2000 ukuya kwi-7000 ukuvelisa izakhiwo zeseli eziguquguqukayo zeemveliso zokuthambisa ifenitshala kunye neebhedi. Iifoams ezinokumelana okuphezulu zidibanisa ii-polymers ezikhethekileyo ezisabelayo ukuphucula amandla okuthwala umthwalo kunye nokubuyela kweseli. Iifomyula ezithambileyo nezithambileyo zifuna izongezo zokuvula iiseli ukulinganisela uxinzelelo lwangaphakathi lwe-pneumatic kunye nokuthintela ukushwabana kwefoam emva kokubumba. Usetyenziso lwangaphakathi lweemoto lusebenzisa iinkqubo eziguquguqukayo ezenziwe ngokwezifiso ukwakha izihlalo zeemoto ezikhululekileyo, iindawo zokubeka iingalo, iindawo zokubeka iintloko, kunye neengqimba ze-acoustic ezikhusela isandi.

Iifoam eziqinileyo zokugquma ubushushu zifuna amanqanaba aphezulu okugquma ukuze kufezekiswe ukuqina kwesakhiwo kunye nokuzinza kobukhulu phantsi kwemithwalo yobushushu. Iiformulators zisebenzisa iipolyols ezinexabiso lokusebenza elingaphezulu kwe-3 kunye namanani aphezulu e-hydroxyl. Uxinano oluphezulu lwe-crosslink ludala izakhiwo zeseli ezivaliweyo ezibamba iigesi zokugquma ngaphakathi kwe-polymer matrix eqinileyo. Ezi zakhiwo zeseli eziqinileyo zibonelela ngozinzo lwe-hydrolytic lwexesha elide kwiimeko zangaphandle. Ubungakanani beeseli ezincinci buphucula amandla okuxinwa koomatshini ngelixa zigcina ukuhanjiswa kobushushu obuphantsi kwiiphaneli zokugquma ubushushu zorhwebo. Izithuthi zothutho ezifrijiweyo, izixhobo zorhwebo, kunye nokugquma isitshizi zixhomekeke kwiinkqubo ze-polyurethane eziqinileyo ukuthintela ukudluliselwa kobushushu. Iiprojekthi zokwakha zifaka iiphaneli ze-polyisocyanurate ezenziwe kwangaphambili ukuze kuncitshiswe ukusetyenziswa kwamandla okwakha. Iifoam eziqinileyo ezibunjiweyo zikwabonelela ngezisombululo zokupakisha ezenzelwe izixhobo ze-elektroniki ezibuthathaka.

Usetyenziso lwe-PEG kwiLaphu, iRabha, kunye neMithi

Iipolymers zePolyethylene glycol zisebenza njengezixhobo zokulungisa ezingezizo ionic ezisebenziseka lula kuzo zonke iintlobo zezicelo zoshishino. Amanqanaba ahlukeneyo obunzima beemolekyuli anika iimpawu ezahlukeneyo zomsebenzi kwimisebenzi yokuvelisa.

• Ukucubungula iLaphu:Iindidi zolwelo ezifana ne-PEG-200 zisebenza njengezithambisi kunye nee-antistatic agents. Iindidi eziphakathi ezifana ne-PEG-400, 600, kunye ne-800 zisebenza njengezithambisi kunye nee-wetting agents ngexesha lokugqiba ifayibha. Iindidi eziphezulu zobunzima beemolekyuli ezifana ne-PEG-4000 zisebenza njengee-adhesive plasticizers kunye nee-softeners ezinamathelayo.
• Ukwenziwa kweRabha:I-PEG-1000 kunye ne-1500 zisebenza njengezinto ezisasaza izinto ezikhuthaza ukusebenza kakuhle kwe-vulcanization kunye nokusasazwa kwe-carbon black. Iiklasi eziqinileyo ezifana ne-PEG-4000 kunye ne-8000 zisebenza njengezinto ezisebenzayo zokukhupha isikhunta, izinto zokuthambisa, kunye nezinto ezipholisa umoya.
• Iifomyula zamayeza:Iipolyol ezinyibilikayo emanzini zisebenza njengezinto ezincedisayo kunye nezinto ezisebenzayo kwiimveliso zonyango. Ezi zinto zicocekileyo ziphucula ukunyibilika kwamayeza asebenzayo, ukusebenza kakuhle kwe-binder, kunye nokusebenza kakuhle kokuhambisa amayeza asetyenziswa ngomlomo nangaphandle.

Iinkqubo zokusebenza ngesinyithi kwimizi-mveliso zixhomekeke kwi-polyethylene glycols ukuze zipholise, zithambise, kwaye zidlulisele ubushushu. Abavelisi bephepha basebenzisa izisombululo ze-polyglycol ukulawula ukugcinwa komswakama kunye nokuphucula ukuguda komphezulu. Ezi zongezo zisebenzayo zibonelela ngozinzo lweekhemikhali kuzo zonke iibhafu zokucubungula ezine-asidi kunye ne-alkaline. Imisebenzi yemizi-mveliso yanamhlanje ikhetha ubunzima be-polymer ethile ukuze iphucule isantya sokucubungula kunye nomgangatho wemveliso.

Iikhrayitheriya zokukhetha ii-MOFAN Special Polyols

Ukuthelekisa Amaxabiso eHydroxyl kunye nokusebenza kwayo neemfuno zesicelo

Ukukhethwa kwe-polyol okusebenzayo kufuna ukufanisa amanani e-hydroxyl kunye nokusebenza ukuze kujoliswe kwiimetrikhi zomzimba. Ukusebenza kumisela isakhiwo sokudibanisa inethiwekhi ephilisweyo. Amaxabiso e-hydroxyl alinganisa uxinano olusebenzayo lwesiza se-hydroxyl ngeyunithi nganye yobunzima. Amaxabiso aphantsi e-hydroxyl kunye nokusebenza phakathi kwe-2 kunye ne-3 avelisa iinethiwekhi ze-elastic. Amaxabiso aphezulu e-hydroxyl kunye nokusebenza phakathi kwe-4 kunye ne-8 enza izakhiwo ze-thermoset eziqinileyo. Ii-formulators zivavanya ezi metrikhi ukuze zilinganise iipropati zokugqibela zoomatshini. Umzekelo, i-polyether polyol enexabiso le-hydroxyl le-150 mg KOH/g kunye nobunzima be-molecule obuphakathi kwe-1200 g/mol ibonisa ukusebenza kufutshane ne-3.2. Ii-formulators zisebenzisa olu didi luthile ukuvelisa iiphaneli ze-foam eziqinileyo kwiiphaneli zangaphakathi zeemoto.

Ukuphucula i-Viscosity, i-Reactivity, kunye ne-Curing Kinetics

Impumelelo yokucubungula ixhomekeke kwindlela echanekileyo yokuhamba kwamanzi kunye nesantya sokuphiliswa. Ukukhetha ii-polyol ezingamanzi ezinobunzima beemolekyuli ezifanelekileyo kulawula isiseko se-viscosity. Ii-formulators zongeza i-calcium carbonate ekhawulezileyo kumthwalo we-20-40 wt.% ukwakha ukumelana nokuwa. Ukongeza, ukongeza i-silica efumileyo kumthwalo we-2-5 wt.% kunika isimilo esinamandla se-thixotropic ukuthintela ukuwa kwi-substrates ezithe nkqo. Ukudibanisa ii-prepolymers nge-isocyanate ukuya kwi-hydroxyl ratio phakathi kwe-1.8:1 kunye ne-2.5:1 kunceda ukuzinzisa i-viscosity yenkqubo. Ukukhetha i-polyol ngononophelo kwenza kube lula ukuphatha ngokuguquguqukayo kwizixhobo zokuhambisa ezizenzekelayo.

Ii-catalysts ze-Organotin ezifana ne-DBTDL kumthwalo we-0.01-0.1 wt.% zimisela amazinga okusabela aqikelelweyo. Ezi zongezo zikhuthaza ukwakheka kwe-urethane ukuze kuqinisekiswe umphezulu ongenamatheli kwimizuzu engama-30 ukuya kwengama-90. Ii-catalysts ze-amine eziphezulu zithanda ukukhawulezisa iiprofayili zokulungisa kwiinkqubo ze-polyurethane. Ukudibanisa ii-catalysts ezisebenzayo kunye nee-polyols zokusebenza kuthintela ukwakheka kwe-void kwiindawo ezibunjiweyo ezixineneyo.

Ukuphucula Uzinzo Lobushushu kunye Nokumelana Nokusingqongileyo

Ukukhethwa kwamathambo omqolo kulawula uzinzo lwe-hydrolytic kunye nokumelana neekhemikhali ixesha elide. Iipolyether polyols zigcina uzinzo oluhle lwe-hydrolytic, zihlala iiyure ezingaphezu kwama-2000 kumswakama ongama-95% kunye nama-70°C ngaphandle kokulahleka okukhulu kwepropathi. Ngokwahlukileyo koko, iipolyester polyols ziwohloka ngokukhawuleza xa kufuma kakhulu kuba umswakama uhlasela unxibelelwano lwee-ester. Ukukhetha iipolyols ezizezinye endaweni yeepolyester polyols kuphucula ukumelana kwamanzi kwi-polyurethane elastomers. Iipolyols ezikhethekileyo zibonelela ngokumelana neekhemikhali okugqwesileyo kwiindawo zoshishino ezifuna kakhulu. Iipolyols ezikhethekileyo zepolybutadiene polyols zigcina ubunzima obungaphezulu kwama-98.5% ngexesha lokuvezwa okuqhubekayo kwi-100°C kangangeeyure ezili-1000, zigcina umahluko we-elastic modulus ungaphantsi kwe-100%.

Ii-backbones ezinevumba elimnandi zibonelela ngokuqina kobushushu ukuze zimelane nobushushu obuphezulu obuvela kwiintlobo ze-isocyanate ezingaphendulwanga. Iinketho ze-Aliphatic zithintela ukutshintsha kombala kwe-UV okukhulu. Ii-formulators zongeza ii-antioxidants kwi-0.5–1.5 wt% ukuphucula ukumelana ne-oxidative ixesha elide. Ukongeza iziqinisi ze-UV kwi-0.5–2.0 wt% kukhusela izinto zangaphandle kumonakalo wemitha yelanga. Ukukhethwa ngokufanelekileyo kwe-polyol kuqinisekisa ukuba ii-polyols ezikhethekileyo ezenzelwe wena zigcina iipropati ezibalulekileyo ze-polyurethane kuzo zonke iinkqubo zangaphandle ezahlukeneyo.

Iipolyols ezikhethekileyo ze-MOFANkunye nothotho lwe-polyethylene glycol oluphezulu lubonelela ngexabiso elisisiseko kuyo yonke i-polymer engineering yanamhlanje. Uyilo lwe-molecular oluchanekileyo luvumela ii-polyols ukuba ziphucule i-reaction kinetics kunye namandla enethiwekhi ebonakalayo. Iipropati zezinto ezilungiselelweyo ziphucula ngokuthe ngqo ukusebenza kwemveliso kwi-polyurethane adhesives, i-structural sealants, i-dynamic elastomers, kunye ne-rigid thermal insulation foams. Ii-formulators ziseka ukumelana okuphezulu kweekhemikhali, uzinzo lobushushu, kunye nokuqina koomatshini ngokusebenzisa i-chemical functional chemistry elawulwayo. Imisebenzi yokucubungula imboni ifezekisa ukusebenza okuphezulu kokuvelisa ngezi zisombululo zeekhemikhali ezicocekileyo kakhulu kwimigca eyahlukeneyo yokucubungula. Abathengi bemizi-mveliso bayamenywa ukuba badibane neengcali zobugcisa ze-MOFAN ukuze baphuhlise iifomyula ezenziwe ngokwezifiso, bajongane neethagethi zokucubungula ezingqongqo, kwaye bafumane inkxaso ezinikeleyo kwiimfuno zokuvelisa ezintsonkothileyo.

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