Umahluko kwiiPropati zePhysicochemical ze-HPMC kunye ne-HEMC

Ubushushu beGel luphawu olubalulekileyo lwe-cellulose ether. Izisombululo zamanzi ze-cellulose ethers zineempawu ze-thermogelling. Njengoko iqondo lokushisa linyuka, i-viscosity iyaqhubeka iyancipha. Xa ubushushu besisombululo bufikelela kwixabiso elithile, isisombululo se-cellulose ether asisabonakali, kodwa senza i-colloid emhlophe, kwaye ekugqibeleni ilahlekelwe yi-viscosity yayo. Uvavanyo lobushushu bejeli libhekisa ekuqaliseni isampulu ye-ether ye-cellulose kunye ne-0.2% yoxinaniso lwesisombululo se-cellulose ether kunye nokufudumeza ngokukhawuleza kwindawo yokuhlambela amanzi de isisombululo sibonakale simhlophe okanye ijeli emhlophe, kwaye i-viscosity ilahlekile ngokupheleleyo. Ubushushu besisombululo bubushushu bejeli be-cellulose ether.

Umlinganiselo we-methoxy, i-hydroxypropyl kunye ne-HPMC inempembelelo ethile kwi-solubility yamanzi, umthamo wokubamba amanzi, umsebenzi ongaphezulu kunye nobushushu bejeli yemveliso. Ngokuqhelekileyo, i-HPMC enomxholo ophezulu we-methoxyl kunye nomxholo ophantsi we-hydroxypropyl ine-solubility yamanzi kunye nomsebenzi omhle wendawo, kodwa ukushisa kwe-gel kuphantsi: ukwandisa umxholo we-hydroxypropyl kunye nokunciphisa umxholo we-methoxy kunokunyusa ubushushu be-gel. Nangona kunjalo, umxholo ophezulu kakhulu we-hydroxypropyl uya kunciphisa ubushushu bejeli, ukunyibilika kwamanzi kunye nomsebenzi ongaphezulu. Ngoko ke, abavelisi be-ether cellulose kufuneka balawule ngokungqongqo umxholo weqela ukuqinisekisa umgangatho ozinzileyo wemveliso.

Isicelo soshishino lokwakha

I-HPMC kunye ne-HEMC zinemisebenzi efanayo kwizinto zokwakha. Ingasetyenziselwa njenge-dispersant, i-arhente yokugcina amanzi, i-thickener, i-binder, njl. Isetyenziselwa udaka lwesamente ukunyusa ubumbano kunye nokusebenza kwayo, ukunciphisa i-flocculation, ukwandisa i-viscosity kunye ne-shrinkage, kwaye inemisebenzi yokugcinwa kwamanzi, ukunciphisa ilahleko yamanzi kwindawo yekhonkrithi, ukwandisa amandla, ukuthintela iintanda kunye nemozulu yeetyuwa ezinyibilikayo zamanzi, njl. Isetyenziswe ngokubanzi kwi-samente, i-gypsum, i-mortar kunye nezinye izinto. Ingasetyenziswa njenge-agent eyenza ifilimu, i-thickener, i-emulsifier kunye ne-stabilizer yepeyinti ye-latex kunye nepeyinti ye-resin enyibilikayo emanzini. Inokumelana nokunxiba okufanelekileyo, ukufana kunye nokunamathela, iphucula ukuxinezeleka komphezulu, ukuzinza kwe-asidi-base kunye nokuhambelana neepigments zetsimbi. Ngenxa yokuzinza kwayo yokugcina i-viscosity, ifanelekile ngokukodwa njenge-dispersant kwiingubo ze-emulsion. Lilonke, nangona inkqubo incinci, isebenza kakuhle kwaye inoluhlu olubanzi lwezicelo.

Ubushushu be-gel ye-cellulose ether inquma ukuzinza kwayo kwe-thermal kwisicelo. Ukushisa kwejeli ye-HPMC ngokuqhelekileyo phakathi kwe-60 ° C kunye ne-75 ° C, kuxhomekeke kuhlobo, umxholo weqela kunye nenkqubo yokuvelisa abavelisi abahlukeneyo. Ngenxa yeempawu zeqela le-HEMC, ukushisa kwayo kwe-gelation kuphezulu, ngokuqhelekileyo ngaphezu kwe-80 ° C, ngoko ukuzinza kwayo kumaqondo aphezulu kubangelwa yi-HPMC. Kwisicelo esisebenzayo, kwindawo yokwakhiwa kwehlobo elishushu, umthamo wokubamba amanzi we-HEMC kunye ne-viscosity efanayo kunye ne-dosage ingcono kune-HPMC. Ngokukodwa emzantsi, udaka lusetyenziswa ngamanye amaxesha kumaqondo aphezulu. I-cellulose ether ye-gel yobushushu obuphantsi iya kulahlekelwa yimpembelelo yayo yokuqina kunye nokugcinwa kwamanzi kwiqondo lokushisa eliphezulu, ngaloo ndlela ikhawuleza ukuqina kodaka lwesamente kunye nokuchaphazela ngokuthe ngqo ukwakhiwa kunye nokuchasana nokuqhekeka.

Ngenxa yokuba kukho amaqela amaninzi e-hydrophilic kwisakhiwo se-HEMC, ine-hydrophilicity engcono. Ukongeza, ukuchasana kokuhamba ngokuthe nkqo kwe-HEMC kukwalungile. Impembelelo yesicelo se-HPMC kwi-adhesive tile iya kuba ngcono.