Indlela yokujiya yei-hydroxyethyl cellulosekukwandisa i-viscosity ngokuqulunqwa kwe-intermolecular kunye ne-intramolecular bond hydrogen, kunye ne-hydration kunye ne-chain entanglement ye-molecular chain. Ngoko ke, indlela yokuqinisa i-hydroxyethyl cellulose inokwahlulwa ibe yimiba emibini: enye yindima ye-intermolecular kunye ne-intramolecular hydrogen bond. Ikhonkco eliphambili le-hydrophobic lidibanisa kunye neemolekyuli zamanzi ezijikelezileyo ngokusebenzisa iibhondi ze-hydrogen, eziphucula ubuninzi be-polymer ngokwayo. Umthamo weengqungquthela unciphisa indawo yokuhamba ngokukhululeka kweengqungquthela, ngaloo ndlela ukwandisa i-viscosity yenkqubo; okwesibini, ngokungena kunye nokugqithwa kwamatyathanga eemolekyuli, amatyathanga e-cellulose akwisakhiwo senethiwekhi esine-dimensional ezintathu kwinkqubo yonke, ngaloo ndlela iphucula i-viscosity.
Makhe sijonge indlela i-cellulose edlala ngayo indima ekugcinweni kokugcinwa kwenkqubo: okokuqala, indima yebhondi ye-hydrogen inqanda ukuhamba kwamanzi akhululekile, idlala indima ekugcinweni kwamanzi, kwaye igalelo ekunqandeni ukuhlukana kwamanzi; okwesibini, ukusebenzisana kwamaketanga e-cellulose I-lap entanglement yenza inethiwekhi edibeneyo okanye indawo eyahlukileyo phakathi kwee-pigments, iifayili kunye neengqungquthela ze-emulsion, ezithintela ukuhlalisa.
Kukudityaniswa kwezi ndlela zimbini ngasentla zesenzo esenza ukubai-hydroxyethyl celluloseukuba nekhono elihle kakhulu lokuphucula uzinzo lokugcina. Kwimveliso yepeyinti ye-latex, i-HEC yongezwa ngexesha lokubetha kunye nokusabalalisa ukunyuka kunye nokunyuka kwamandla angaphandle, ukunyuka kwe-shear velocity gradient, iimolekyuli zicwangciswe ngendlela elungeleleneyo ngokuhambelana nolwalathiso lokuhamba, kunye nenkqubo yokuguqula i-lap phakathi kwamakhonkco e-molecular iyatshatyalaliswa, ekulula ukuSlayida kunye nomnye, i-viscosity yenkqubo iyancipha. Ekubeni inkqubo iqulethe inani elikhulu lamanye amacandelo (i-pigments, fillers, emulsions), eli lungiselelo elicwangcisiweyo alikwazi ukubuyisela imeko edibeneyo yokudibanisa kunye nokugqithisa nangona ibekwe ixesha elide emva kokuba ipeyinti ixutywe. Kule meko, i-HEC ixhomekeke kuphela kwiibhondi ze-hydrogen. Isiphumo sogcino lwamanzi kunye nokujiya kunciphisa ukusebenza kakuhle kokuqina kweI-HEC, kunye negalelo lalo mbuso wokusabalalisa kwisigxina sokugcinwa kwenkqubo nayo iyancitshiswa ngokufanelekileyo. Nangona kunjalo, i-HEC echithwayo yachithwa ngokufanayo kwinkqubo kwisantya esisezantsi esishukumisayo ngexesha le-letdown, kunye nesakhiwo sothungelwano esakhiwe ngokudibanisa kwe-cross-linking of HEC chains sonakaliswa kancinci. Ngaloo ndlela ibonisa ukusebenza kakuhle kokuqina kunye nozinzo lokugcina. Ngokucacileyo, isenzo saxeshanye seendlela ezimbini zokujiya sisiseko sokutyeba okusebenzayo kweselulosi kunye nokuqinisekisa uzinzo lokugcina. Ngamanye amazwi, ukuchithwa kunye nokusabalalisa imeko ye-cellulose emanzini iya kuchaphazela kakhulu umphumo wayo wokuqina kunye negalelo layo ekugcinweni kozinzo.
Ixesha lokuposa: Apr-25-2024