Izinto zePolyurethane eziphoqeleka yiHydrophobic zenziwe ngeTheoremchem Dimeryl Diisocyanate DDI

Izinto ezibalulekileyo ekufuneka ziqwalaselwe

• I-Theoremchem DDI isebenzisa ikhonkco elide lekhabhoni ukuvimba amanzi nokukhusela ii-polyurethanes ekonakaleni komswakama.
• Izixhobo ezisekelwe kwi-DDI zihlala ziguquguquka kwimozulu ebandayo kwaye ziyamelana nokutyheli ngenxa yokukhanya kwelanga.
• Iiformula zisebenzisa i-DDI ukwenza i-ehlala ixesha elide iingubo ezingangeni manzi, izinto zokuvala ulwandle, kunye nokhuseleko lwezinto ze-elektroniki.

Ulwakhiwo lweeKhemikhali kunye neNdlela yokungafihlisi amanzi ye-DDI

I-Theoremchem i-Dimeryl Diisocyanate (DDI) iguqula iifomyula ze-polyurethane eziqhelekileyo zibe zii-polymers ezithintela amanzi. Uyilo lwayo olukhethekileyo lweekhemikhali ludibanisa iipropati ze-aliphatic kunye nesakhiwo esikhulu se-hydrocarbon. Olu yilo ludala ikhaka eliqinileyo ekungeneni kwamanzi kwinqanaba le-molecular.

Ithambo le-Non-Polar C36 Dimer Fatty Acid Backbone

Imfihlo ephambili emva kokumelana namanzi kweTheoremchem DDI ikwisakhiwo sayo esiphambili. Ii-diisocyanates zemveli ezifana ne-MDI okanye i-TDI ziqulathe imixokelelwane emifutshane yekhabhoni okanye iiringi ze-aromatic. Ngokwahlukileyo koko, i-DDI inomqolo omde we-C36 dimer fatty acid.

Ii-Isocyanates eziqhelekileyo (Ikhonkco elifutshane) ---> I-Theoremchem ye-Hydrophilic Susceptibility ephezulu ye-DDI (i-C36 Dimer Backbone) ---> Isikhuselo esikhulu se-Hydrophobic 

Olu luhlu lwee-hydrocarbon zekhabhoni ezingama-36 alukho kwi-polar ngokupheleleyo. Izakhiwo zeekhemikhali ezingezizo i-polar azenzi iibhondi ze-hydrogen kunye neemolekyuli zamanzi. Endaweni yoko, iitsheyini ezinde ze-alkyl zityhala iimolekyuli zamanzi kude nenethiwekhi ye-polymer. Uxinano olukhulu lweeathom zekhabhoni kunye ne-hydrogen ludala umqobo oqhubekayo we-hydrophobic kuyo yonke i-matrix ephilisiweyo.

Into ebalulekileyo ekufuneka uyithathe: I-C36 dimer fatty acid backbone isebenza njenge-lipid phase yangaphakathi ngaphakathi kwe-polyurethane matrix. Igxotha amanzi angamanzi kwaye ithintela ukusasazeka komswakama kwizinto.

I-Aliphatic Character kunye ne-Low Surface Energy

I-Theoremchem DDI inophawu olupheleleyo lwe-aliphatic. Iikhompawundi ze-Aliphatic azinazo izangqa ze-aromatic, ezithintela i-photo-oxidation kunye nokutyheli phantsi kwelanga. Ngaphezu koko, olu lwakhiwo lwe-aliphatic C36 lunciphisa kakhulu amandla omphezulu we-polyurethanes ezenziweyo.

Izixhobo ezisebenzisa amandla aphantsi omhlaba zinyanzela ulwelo ukuba ludibane endaweni yokuba lusasazeke. Iipolyurethane ezisekwe kwi-DDI zibonisa ii-engile eziphezulu zokunxibelelana namanzi.

Amandla aphantsi omphezulu athintela amanzi angamanzi ukuba angamanzisi umphezulu wepolymer. Amathontsi emvula kunye nokufuma komoya kuqengqeleka ngaphandle kwengxaki. Le ndlela iqinisekisa ukhuseleko lwexesha elide kwiziseko ezibuthathaka ezingaphantsi kwengubo okanye isitywini.

Isithintelo seSteric kwi-Hydrolytic Cleavage

Amanzi ayonakalisa i-polyurethanes eqhelekileyo ngokuhlasela unxibelelwano lwe-ester kunye ne-urethane. Le nkqubo yokuqhekeka kweekhemikhali ibizwa ngokuba yi-hydrolysis. I-Theoremchem DDI ithintela i-hydrolysis ngokusebenzisa indlela eyaziwa ngokuba yi-steric prohibition.

Iintambo ezinde ze-C36 dimer zenza i-spatial bulk ejikeleze ii-chemical bonds ezisengozini. Ezi ngalo zinkulu ze-hydrocarbon zithintela ngokwasemzimbeni iimolekyuli zamanzi ($H_2O$) ukuba zingafikeleli kwii-urethane linkages.

• Amaqela e-Bulky C36 agcwele indawo ye-molecular ejikeleze amaqela e-ester kunye ne-urethane.
• Iimolekyuli zamanzi azikwazi ukufikelela kwiikhonkco zamakhemikhali ukuze zibangele ukuqhekeka kweebhondi.
• Inethiwekhi yepolymer igcina amandla ayo okuqala okutsalwa kunye nokuthamba ngokuhamba kwexesha.

Uphando lweSicelo se-DDI (Dimeryl Diisocyanate) lungqina ukuba amaqela amakhulu e-aliphatic avimba ngokwasemzimbeni iimolekyuli zamanzi ukuba zingafikeleli kwiindawo ezinobungozi. Ngenxa yoko, ii-polyurethanes ezenziwe ngeTheoremchem DDI ziyasinda ekuchatshazelweni rhoqo kwiindawo ezishushu, ezifumileyo, nezingaphantsi kwamanzi ngaphandle kokonakala kwesakhiwo.

Iingenelo zokusebenza kweePolyurethanes ezisekwe kwi-DDI

I-Theoremchem Dimeryl Diisocyanate (DDI) inika izixhobo ze-polyurethane iimpawu zomzimba nezekhemikhali ezibalaseleyo. Iifomyula zoshishino zifumana iingenelo zokusebenza ezicacileyo xa zitshintsha ii-isocyanates zemveli nge-DDI. Ikhonkco elide le-aliphatic le-C36 libonelela ngokulinganisela okufanelekileyo phakathi kokuqina koomatshini kunye nokunyamezela okusingqongileyo.

Ukumelana neHydrolysis ephezulu kunye nokuzinza kokwaluphala

Iimolekyuli zamanzi zibangela ukonakala okukhulu kwe-polymer chain ngokuhamba kwexesha elide. I-Theoremchem DDI isombulula le ngxaki ngokukhusela iibhondi ze-urethane ezinobuthathaka be-hydrolytically.

Ingcaciso ephambili: Iifomyula ezisebenzisa i-DDI zigcina ukuya kuthi ga kwi-95% yamandla azo okuqala okutsalwa emva kovavanyo olude lokuntywiliselwa emanzini, ngelixa ii-polyurethanes ezisekwe kwi-TDI eziqhelekileyo ziwohloka kakhulu.

Uphando lweSicelo se-DDI (I-Dimeryl Diisocyanate ibonisa amandla ayo okugcina iipropati zoomatshini emva kokuvezwa ixesha elide kumswakama nobushushu. Umqolo omkhulu we-C36 ophoqa amanzi uvimba ukufikelela kumswakama. Ngenxa yoko, iipolymers ziyamelana nokuqhekeka kwetyathanga, ukuthamba, kunye nokuqhekeka kwisithuba seminyaka emininzi yokusebenza.

Ukufunxwa koMphunga okuPhantsi kunye nokuVuleka koMphunga

Iinethiwekhi zePolyurethane eziqulethe i-DDI zibonisa ukufunxwa kwamanzi okuncinci kakhulu. Ukupakisha okuxineneyo kwe-hydrophobic kudala umqobo oqinileyo ngaphakathi kwe-elastomer edibeneyo.

• Ukufunxwa kwamanzi okuphantsi kakhulu: Ii-elastomers ezisekelwe kwi-DDI zifunxa amanzi angaphantsi kwe-0.5% ngobunzima emva kweeyure ezingama-24 zokuntywiliselwa ngokupheleleyo.
• Umqobo wokuVula umphunga: Inethiwekhi ephoqa amanzi ithintela ukuhanjiswa komphunga womswakama ngeefilimu ezincinci zepolymer.
• Ukhuseleko lokugqwala: Ukuncipha kokungena komphunga kukhusela iziseko zesinyithi ezingaphantsi komhlwa kunye nomonakalo we-oxidative.

Olu hlobo lobuthathaka bokufuma luthintela ukudumba kunye nokulahleka kokunamathela kwiingubo ezivezwe kumswakama ophezulu okanye phantsi kwamanzi.

Ukuguquguquka Okuphuculweyo kunye nokusebenza kobushushu obuphantsi

I-Theoremchem DDI inesakhiwo eside se-aliphatic dimer. Le tyathanga eguquguqukayo yehlisa kakhulu ubushushu bokuguqulwa kweglasi ($T_g$) yamacandelo athambileyo kwi-polyurethane formulations.

Ikhonkco le-Dimer eliNde eliyi-Aliphatic ---> i-Tg esezantsi ---> i-High Chain Mobility kwi-Sub-Zero Temps 

I-DDI inika ukuhambahamba okukhulu kunye nokufakelwa kweplastiki ngaphakathi ngaphandle kokufuna izongezo zangaphandle eziguquguqukayo. Itheyibhile engezantsi ichaza ukuphuculwa kokusebenza okufezekisiweyo kwiinkqubo ze-DDI:

Ii-formulators zifikelela kulwa nobunzima obuphezulu bokusebenza kwiifestile zobushushu obubanzi.

• Ukwandiswa kweXesha lokuPhumla: Uyilo lweemolekyuli ze-aliphatic ze-DDI olunemixokelelwane emide lunika ukuhamba kwe-chain okuphezulu kunye nokuthamba, okuthintela ukuqhekeka phantsi kokugoba okuphindaphindiweyo okanye uxinzelelo lwempembelelo.
• Ukuguquguquka kobushushu obuphantsi: I-DDI yehlisa ubushushu bokutshintsha kweglasi ($T_g$) yeendawo ezithambileyo ze-polyurethane, ivumela i-elastomer ukuba ihlale iphezulu ukuguquguquka kumaqondo obushushu aphantsi ngaphandle kokubandezeleka kukuqhekeka.

Ukumelana kakuhle kweekhemikhali kunye ne-UV

Ii-isocyanates ze-aliphatic zinika ukumelana okungaphakathi kwimitha yelanga kunye neekhemikhali ezirhabaxa. Ngokungafaniyo neekhompawundi ze-aromatic, i-DDI ayinazo ii-conjugations ze-carbon-carbon double bond ezifunxa ukukhanya kwelanga.

Iingubo ezisekwe kwi-DDI zimelana nokukhanya kwe-ultraviolet okuqhubekayo ngaphandle kokutyheli, ukutshixiza, okanye ukuqhekeka komphezulu. Ngaphezu koko, umqolo we-hydrocarbon ongengowe-polar umelana nee-acids, ii-alkalis, kunye neetyuwa, ugcina ukuqina kwesakhiwo ixesha elide kwiindawo zoshishino ezinzima.

Izikhokelo zokwenziwa kunye nokucutshungulwa kweMichiza yoBugcisa obufanelekileyo bokungonwabi ngamanzi

Ii-formulators kufuneka zilandele iiparameters ezichanekileyo zokucubungula ukuze ziphucule iimpawu zokuthintela amanzi I-Theoremchem DDIUkulungelelaniswa kweekhemikhali ezicwangcisiweyo kunye nokukhethwa kwamacandelo kuqinisekisa ukuchacha okupheleleyo kunye noxinano oluphezulu lwenethiwekhi.

Ukulinganisela kweStoichiometric kunye nokuphuculwa kweNCO/OH Ratio

Ukufikelela kwi-hydrophobicity ephezulu kufuna ulawulo oluchanekileyo lwe-stoichiometric index. Ii-formulators zihlala zigcina umlinganiselo we-NCO/OH phakathi kwe-1.03 kunye ne-1.08.

• Amaqela e-isocyanate agqithisileyo ahlawulela umswakama ongaphantsi komhlaba ngexesha lokucubungula.
• Ukusabela okupheleleyo kwamaqela e-hydroxyl kuthintela iindawo ezingabonakaliyo ze-hydrophilic ngaphakathi kwi-matrix.
• Uxinano oluphezulu lwe-crosslinking ludala i-matrix eqinileyo ye-polymer ekwaziyo ukumelana nokungena kwamanzi.

Umlinganiselo we-stoichiometric olinganiselayo uqinisekisa ukwakheka kwenethiwekhi ye-polymer epheleleyo. Ngenxa yoko, i-polyurethane ecociweyo iyawagxotha amanzi kwaye igcina uzinzo lwesakhiwo.

Ukukhethwa kwePolyol ukuze kubekho ukuphoxeka okufana nokungahoywa kwamanzi

Ukhetho lwePolyol luchaphazela ngokuthe ngqo amandla okugqibela omphezulu we-polyurethane elastomer. Ukudibanisa iTheoremchem DDI kunye ne-hydrophobic polyols kudala ukumelana okunamandla kwamanzi okusebenzisana.

Ingcebiso Yokwenza: Ukudityaniswa kwe-DDI nee-polyols ezingezizo ii-polar ezifana i-polybutadiene epheliswe yi-hydroxyl (HTPB) ivelisa ii-polyurethanes ezinokufunxwa kwamanzi okuphantsi kakhulu.

Uphando lweSicelo se-DDI (i-Dimeryl Diisocyanate) lubonisa ukuba ukudibanisa i-DDI ne-dimer acid-based polyols kuphucula uzinzo lwe-hydrolytic. Ezi nxalenye zithambileyo ezingezizo ze-polar zisebenza ecaleni komqolo we-C36, zivala ngempumelelo i-polymer matrix ekungeneni kolwelo.

Ubushushu beReaction kunye noKhetho lweCatalyst

Ukusebenza kakuhle kweTheoremchem DDI kuvumela ulawulo olulula kwi-reaction kinetics. Iingcali zekhemistri zigcina amaqondo obushushu okwenziwa phakathi kwama-70°C nama-90°C ngexesha lokulungiselela i-prepolymer.

Iiprofayili zobushushu ezilawulwayo zithintela iimpembelelo ezingalindelekanga kwaye zigcina ulwakhiwo lwe-polymer chain lungaphobiyo emanzini.

Uphando lweSicelo se-DDI (Dimeryl Diisocyanate)

Iifomyula zoshishino zidibanisa iTheoremchem Dimeryl Diisocyanate kwiifomyula zepolymer ezikhethekileyo. Isiseko esikhethekileyo se-C36 hydrophobic sivumela ukhuseleko oluphezulu kumacandelo obuchwephesha afuna izinto ezininzi.

Iingubo ezingangeni manzi kunye neeNkumba eziKhuselayo

Ii-formulators zisebenzisa i-Theoremchem DDI ukwakha iingubo ezingangeni manzi ezisebenza kakuhle. I-non-polar C36 chain ikhusela i-concrete, umthi kunye ne-metal substrates ekungeneni komswakama. Uphando lweSicelo se-DDI (UDimeryl Diisocyanate ubonakalisa ukuguquguquka okumangalisayo kwefilimu kunye nokukwazi ukuvala iingcangca phantsi kweemeko zemozulu eziguquguqukayo.

Izitywini zaselwandle kunye nezincamathelisi ezingaphantsi kwamanzi

Iindawo zaselwandle zifuna ukumelana nezinto eziqhubekayo nxamnye nokutshizwa ngetyuwa kunye nokuntywiliselwa emanzini. Iipolyurethane ezisekwe kwi-DDI zibonelela ngamandla okuncamathela aqinileyo ixesha elide kwiindawo ezimanzi ngaphandle kokusebenzisa i-hydrolysis yeekhemikhali.

Iinjineli zichaza ezi zitywini ezihlala ixesha elide kwiidekhi zeenqanawa, iindawo zokudibanisa iinqanawa, kunye noqhagamshelo lwemibhobho engaphantsi komhlaba.

Ii-Encapsulants ze-elektroniki kunye neeCompounds zePotting

Izixhobo zombane ezithambileyo zifuna ukhuseleko oluthembekileyo kumswakama womoya kunye nokubola kweekhemikhali. Iikhompawundi ze-polyurethane potting ezenziwe nge-DDI zihlukanisa ii-microcircuits ezinobuthathaka ngokufanelekileyo.

Inzuzo ephambili: Iikhompawundi ze-DDI potting zigcina ubushushu obuphezulu be-dielectric kunye nokuvuleka komphunga wamanzi okuphantsi kakhulu, zikhusela ii-elektroniki ezibuthathaka kwi-electrical short circuits.

Iingubo zeLaphu ezifihla iHydrophobic kunye neeMkhumba ezenziweyo

Abavelisi belaphu basebenzisa ii-emulsions ze-DDI zamanzi ukugqiba amalaphu obuchwephesha aphezulu kunye neesikhumba ezenziwe ngokwenziwa. Olu nyango lukhethekileyo lunika amandla okuchasa amanzi ahlala ixesha elide ngelixa ligcina amalaphu ethambile kwaye eguquguquka ngokuphawulekayo. Uphando loSetyenziso lwe-DDI (Dimeryl Diisocyanate) lubonisa ukuba amalaphu anyangiweyo anyamezela imijikelo yokuhlanjwa ngokuphindaphindiweyo ngaphandle kokulahlekelwa ziimpawu zawo zomphezulu ezingangeni manzi.

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Ithiyoremkhem I-Dimeryl Diisocyanate (DDI) Inika isisombululo sekhemikhali esisebenza kakuhle kwi-polyurethanes ezifuna ukhuseleko olupheleleyo emanzini kunye nokuqina koomatshini. Ukudibanisa umqolo we-C36 ongengowe-polar kuthintela ukusilela kwesakhiwo kwiindawo ezimanzi, zaselwandle, nakwi-elektroniki. Ii-formulators zenza lula iingubo ezihlala ixesha elide, izitywini, kunye nee-elastomers ezinokuthembeka okuhlala ixesha elide. Uphando lwe-DDI (Dimeryl Diisocyanate) lubonisa iingenelo eziphambili zemozulu embi:

FAQ

I-Theoremchem DDI iyiphucula njani indlela yokumelana namanzi kwi-polyurethane?

I-Theoremchem DDI inomqolo omde we-hydrocarbon we-C36 ongengowe-polar. Olu lwakhiwo lwe-hydrophobic lugxotha iimolekyuli zamanzi kwaye lukhusela iibhondi zeekhemikhali ezibuthathaka kwi-hydrolytic cleavage.

Ngaba ii-formulators zingasebenzisa i-Theoremchem DDI kwizicelo zangaphandle?

Ewe. Ulwakhiwo lwe-aliphatic lweTheoremchem DDI luthintela i-photo-oxidation kunye nokutyheli phantsi kwelanga. Izinto zigcina ukukhanya okuphezulu, ukuguquguquka, kunye nokumelana nemozulu ngokuhamba kwexesha.

Zeziphi iipolyols ezihambelana kakuhle neTheoremchem DDI?

Iipolyol ezingezizo ezi-polar ezifana i-polybutadiene epheliswe yi-hydroxyl (HTPB) Ihambelana kakuhle kakhulu neTheoremchem DDI. Olu dibaniso luvelisa ii-polyurethanes ezinokufunxa amanzi kancinci kakhulu kunye nokuguquguquka okuphezulu.