Isiphumo sokutyeba se-cellulose ether sixhomekeke kwi: iqondo lepolymerization ye-cellulose ether, i-concentration yesisombululo, izinga le-shear, ubushushu kunye nezinye iimeko. Ipropathi ye-gelling yesisombululo yipropati ye-alkyl cellulose kunye ne-derivatives yayo eguqulwayo. Iimpawu ze-gelation zihambelana neqondo lokutshintshwa, ukugxininiswa kwesisombululo kunye nezongezo. Kwiimveliso eziguqulweyo ze-hydroxyalkyl, iipropati zejeli nazo zihambelana neqondo lokuguqulwa kwe-hydroxyalkyl. Kuba viscosity low MC kunye HPMC, 10% -15% isisombululo ingalungiswa, viscosity medium MC kunye HPMC ingalungiswa 5% -10% isisombululo, lo gama viscosity eliphezulu MC kunye HPMC ungalungisa kuphela 2% -3% isisombululo, kwaye Ngokuqhelekileyo. Ukuhlelwa kwe-viscosity ye-cellulose ether iphinda ihlelwe yi-1% -2% isisombululo.
Ubunzima bemolekyuli ephezulu ye-cellulose ether inokuqina okuphezulu. Kwisisombululo esifanayo soxinaniso, iipolymers ezinobunzima beemolekyuli ezahlukeneyo zinee-viscosities ezahlukeneyo. Iqondo eliphezulu. I-viscosity ekujoliswe kuyo inokufezekiswa kuphela ngokongeza inani elikhulu le-ether ye-cellulose ephantsi ye-molecular weight. I-viscosity yayo inokuxhomekeka okuncinci kwireyithi yokucheba, kwaye i-viscosity ephezulu ifikelela kwi-viscosity ekujoliswe kuyo, kwaye inani elifunekayo lokongeza lincinci, kwaye i-viscosity ixhomekeke ekusebenzeni kakuhle. Ngoko ke, ukufezekisa ukuhambelana okuthile, inani elithile le-cellulose ether (ukugxilwa kwesisombululo) kunye ne-viscosity yesisombululo kufuneka kuqinisekiswe. Iqondo lokushisa le-gel yesisombululo liyancipha ngokuhambelana nokunyuka koxinzelelo lwesisombululo, kunye neegels kwiqondo lokushisa emva kokufikelela kwinqanaba elithile. Uxinzelelo lwe-gelling lwe-HPMC luphezulu ngokwentelekiso kwiqondo lobushushu begumbi.
Ukuhambelana kungalungiswa ngokukhetha ubungakanani besuntswana kunye nokukhetha i-cellulose ethers ngeedigri ezahlukeneyo zokuguqulwa. Into ebizwa ngokuba yinguquko kukwazisa iqondo elithile lokutshintshwa kwamaqela e-hydroxyalkyl kwisakhiwo samathambo e-MC. Ngokutshintsha amaxabiso ahambelanayo atshintshileyo amabini abambeleyo, oko kukuthi, i-DS kunye ne-ms ehambelanayo amaxabiso e-methoxy kunye ne-hydroxyalkyl esihlala siyithetha. Iimfuno ezahlukeneyo zokusebenza ze-cellulose ether zinokufunyanwa ngokutshintsha amaxabiso ahambelanayo ahambelanayo amabini abambeleyo.
Ubudlelwane phakathi kokuhambelana kunye nokuguqulwa: ukongezwa kwe-cellulose ether kuchaphazela ukusetyenziswa kwamanzi kwi-mortar, ukutshintsha umlinganiselo we-binder yamanzi wamanzi kunye ne-samente yimpembelelo yokuqina, i-dosage ephezulu, ngakumbi ukusetyenziswa kwamanzi.
I-cellulose ethers esetyenziswe kwizinto zokwakha ezinomgubo kufuneka ichithe ngokukhawuleza emanzini abandayo kwaye inike ukuhambelana okufanelekileyo kwesistim. Ukuba kunikwe umlinganiselo othile wokucheba, isuka ibe yibloko ejikelezayo kunye ne-colloidal, eyimveliso ekumgangatho ophantsi okanye ekumgangatho ophantsi.
Kukwakho nobudlelwane obuhle bomgca phakathi kokungaguquguquki kwentlama yesamente kunye nedosi ye-cellulose ether. I-ether ye-cellulose inokunyusa kakhulu i-viscosity yodaka. Ubukhulu bedosi, kokukhona isiphumo esicacileyo. I-high-viscosity cellulose ether isisombululo samanzi sine-thixotropy ephezulu, ekwayimpawu enkulu ye-cellulose ether. Izisombululo ezimanzi ze-MC polymers zihlala zine-pseudoplastic kunye ne-non-thixotropic fluidity ngaphantsi kobushushu bejeli yazo, kodwa iipropathi ezihamba ngeNewtonian kumazinga aphantsi okucheba. I-Pseudoplasticity iyanda kunye nobunzima be-molecular okanye i-concentration ye-cellulose ether, kungakhathaliseki ukuba luhlobo luni lwe-substitute kunye neqondo lokutshintshwa. Ngoko ke, i-cellulose ethers yebakala elifanayo le-viscosity, kungakhathaliseki ukuba i-MC, i-HPMC, i-HEMC, iya kuhlala ibonisa iimpawu ezifanayo ze-rheological nje ngokuba ugxininiso kunye nobushushu bugcinwa rhoqo.
Iigels zesakhiwo zenziwe xa ubushushu buphakanyisiwe, kwaye ukuhamba okuphezulu kwe-thixotropic kwenzeka. Uxinzelelo oluphezulu kunye ne-viscosity ephantsi ye-cellulose ethers ibonisa i-thixotropy nangaphantsi kweqondo lokushisa le-gel. Lo mhlaba unenzuzo enkulu kuhlengahlengiso lomgangatho kunye nokuncipha kulwakhiwo lodaka lwesakhiwo. Kufuneka kucaciswe apha ukuba i-viscosity ephezulu ye-ether ye-cellulose, ngcono ukugcinwa kwamanzi, kodwa ukuphakama kwe-viscosity, ukuphakama kwe-molecular weight ye-cellulose ether, kunye nokuncipha okuhambelanayo kwi-solubility yayo, enefuthe elibi. kugxininiso lodaka kunye nokusebenza kolwakhiwo. Ukuphakama kwe-viscosity, kuyabonakala ngakumbi umphumo wokuqina kumdaka, kodwa awulingani ngokupheleleyo. Enye i-viscosity ephakathi kunye nephantsi, kodwa i-ether ye-cellulose eguqulwayo inomsebenzi ongcono ekuphuculeni amandla okwakhiwa kodaka olumanzi. Ngokunyuka kwe-viscosity, ukugcinwa kwamanzi kwe-cellulose ether kuphucula.
Ixesha lokuposa: Feb-16-2023