Isiphumo sokutyeba se-cellulose ether sixhomekeke kwi: iqondo lepolymerization ye-cellulose ether, i-concentration yesisombululo, izinga le-shear, ubushushu kunye nezinye iimeko.Ipropati ye-gelling yesisombululo iyingqayizivele kwi-alkyl cellulose kunye ne-derivatives yayo eguqulwayo.Iimpawu ze-gelation zihambelana neqondo lokutshintshwa, ukugxininiswa kwesisombululo kunye nezongezo.Kwizinto ze-hydroxyalkyl eziguqulweyo, iipropathi zejeli nazo zihambelana neqondo lokuguqulwa kwe-hydroxyalkyl.Kwi-viscosity ephantsi ye-MC kunye ne-HPMC, isisombululo se-10% -15% sinokulungiswa, i-viscosity ephakathi MC kunye ne-HPMC ingalungiswa isisombululo se-5% -10%, kunye ne-viscosity ephezulu ye-MC kunye ne-HPMC inokulungiselela kuphela isisombululo se-2% -3%, kwaye ngokuqhelekileyo i-viscosity classification ye-cellulose ether iphinda ihlelwe kunye ne-1% -2% isisombululo.
I-high-molecular-weight-cell cellulose ether ine-high thickening performance, kwaye iipolymers ezinobunzima bemolekyuli ezahlukeneyo zinee-viscosities ezahlukeneyo kwisisombululo esifanayo soxinaniso.I-viscosity ekujoliswe kuyo inokufezekiswa kuphela ngokudibanisa inani elikhulu le-molecular weight cellulose ether.I-viscosity yayo inokuxhomekeka okuncinci kwireyithi yokucheba, 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.Ngokuguqula amaxabiso ahambelanayo atshintshileyo atshintshiweyo amabini, oko kukuthi, i-DS kunye ne-MS imilinganiselo ehambelanayo yokutshintshwa kwamaqela e-methoxy kunye ne-hydroxyalkyl esihlala siyithetha.Iimfuno ezahlukeneyo zokusebenza ze-cellulose ether zinokufunyanwa ngokutshintsha amaxabiso ahambelanayo ahambelanayo amabini abambeleyo.
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: Mar-20-2023