Inkulu i-viscosity yeHPMCI-hydroxypropyl methyl cellulose, ngcono ukusebenza kokugcinwa kwamanzi. I-Viscosity yiparameter ebalulekileyo yokusebenza kwe-HPMC. Okwangoku, abavelisi be-HPMC abahlukeneyo basebenzisa iindlela ezahlukeneyo kunye nezixhobo ukumisela i-viscosity ye-HPMC. Iindlela eziphambili zeHaake Rotovisko, Hoppler, Ubbelohde kunye Brookfield, njl.
Kwimveliso efanayo, iziphumo ze-viscosity ezilinganiswe ngeendlela ezahlukeneyo zihluke kakhulu, ezinye zihluke kakhulu. Ngoko ke, xa uthelekisa i-viscosity, kufuneka iqhutywe phakathi kwendlela yokuvavanya efanayo, kubandakanywa ukushisa, i-rotor, njl.
Ubungakanani besuntswana, incinci incinci, ngcono ukugcinwa kwamanzi. Amasuntswana amakhulu e-cellulose ether yokunxibelelana namanzi, umphezulu ngokukhawuleza unyibilike kwaye wenze ijeli ukusonga izinto zokuthintela iimolekyuli zamanzi ukuba zingaqhubeki nokungena, ngamanye amaxesha ixesha elide lixhokonxa alinakuhlakazwa ngokulinganayo, ukubunjwa kwesisombululo esinodaka okanye iagglomerate. Ukunyibilika kwe-ether ye-cellulose yenye yezinto zokukhetha i-ether ye-cellulose. Ukulunga kukwayisalathisi sokusebenza esibalulekileyo se-methyl cellulose ether. I-MC yodaka olomileyo ifuna umgubo, umxholo wamanzi aphantsi, kunye nokucoleka kwe-20% ~ 60% ubungakanani beqhekeza elingaphantsi kwe-63um. Ukulunga kuchaphazela ukunyibilika kweHPMCihydroxypropyl methyl cellulose ether. I-coarse MC idla ngokuba yigranular kwaye inokunyibilika ngokulula emanzini ngaphandle kwe-agglomerating, kodwa isantya sokunyibilika sicotha kakhulu, ngoko ke ayifanelekanga ukusetyenziswa kudaka olomileyo. Kwidaka elomileyo, i-MC ihlakazwe phakathi kwe-aggregate, i-fine fillers kunye ne-cementing materials ezifana ne-samente, kwaye kuphela umgubo ococekileyo onokuthi uphephe i-clumping ye-methyl cellulose ether xa ixutywa namanzi. Xa i-MC yongeza amanzi ukunyibilikisa i-agglomerate, kunzima kakhulu ukuyichitha kwaye ukuyinyibilikisa. I-MC ene-coarse fineness ayigcini nje inkunkuma, kodwa inciphisa amandla wendawo yodaka. Xa udaka olomileyo olunjalo lwakhiwe kwindawo enkulu, isantya sokunyanga sodaka olomileyo lwengingqi sincitshiswa kakhulu, okubangela ukuqhekeka okubangelwa lixesha lokunyanga elahlukileyo. Ngodaka lokutshiza ngomatshini, ngenxa yexesha elifutshane lokuxuba, ukulunga kuphezulu.
Ngokuqhelekileyo, okukhona i-viscosity iphezulu, ingcono isiphumo sokugcina amanzi. Nangona kunjalo, ukuphakama kwe-viscosity kukuba, ubunzima be-molecular ye-MC buphezulu, kwaye ukusebenza kokutshatyalaliswa kuya kuncipha ngokuhambelanayo, okunempembelelo embi kumandla kunye nokusebenza kokwakhiwa kodaka. Okukhona i-viscosity iphezulu, kokukhona kucaca ngakumbi umphumo wokuqina wodaka, kodwa awuhambelani nobudlelwane. Ukuphakama kwe-viscosity, udaka olumanzi luya kuba lunamathele ngakumbi, zombini ulwakhiwo, ukusebenza kwe-scraper enamathele kunye nokunamathela okuphezulu kwizinto ezisisiseko. Kodwa akuloncedo ukwandisa amandla okwakhiwa kodaka olumanzi. Ngexesha lokwakha, ukusebenza kwe-anti-sag akubonakali. Ngokuchasene noko, i-viscosity ephantsi kodwa i-methyl cellulose ethers ehlaziyiweyo inomsebenzi ogqwesileyo ekuphuculeni amandla okwakhiwa kodaka olumanzi.
I-ether ye-cellulose eyongeziweyo yongezwa kwidaka, ukusebenza kakuhle kokugcinwa kwamanzi, ukuphakama kwe-viscosity, ukusebenza kakuhle kokugcinwa kwamanzi.
Ukucolwa kwe-HPMC kunempembelelo ethile ekugcineni amanzi, ngokuthetha ngokubanzi, kwi-viscosity efanayo kunye nokucoleka okwahlukileyo kwe-methyl cellulose ether, kwimeko yomlinganiselo ofanayo wokongezwa, isiphumo sokugcinwa kwamanzi singcono.
Ukugcinwa kwamanzi kwe-HPMC kukwanxulumene nobushushu bokusetyenziswa, kunye nokugcinwa kwamanzi kwe-methyl cellulose ether kuncipha ngokunyuka kwamaqondo obushushu. Kodwa kwisicelo semathiriyeli yokwenyani, iindawo ezininzi zodaka olomileyo zihlala zikwiqondo lobushushu eliphezulu (elingaphezulu kwama-40 degrees) phantsi kwemeko yolwakhiwo kwindawo eshushu, enje ngokufakwa ehlotyeni kodaka lwangaphandle, oluhlala lukhawulezisa ukuqina kodonga. isamente kunye nokuqina kodaka olomileyo. Ukuncipha kwezinga lokugcinwa kwamanzi kukhokelela kwimvakalelo ecacileyo yokuba zombini ukwakhiwa kunye nokumelana nokuqhekeka kuchaphazelekayo. Kule meko, ukunciphisa impembelelo yezinto zokushisa kuba yinto ebaluleke kakhulu. Nangona i-additive ye-methyl hydroxyethyl cellulose ether ithathwa njengephambili kuphuhliso lwezobuchwepheshe, ukuxhomekeka kwayo kwiqondo lokushisa kuya kukhokelela ekunciphiseni iimpawu zodaka olomileyo. Nangona ukonyuka kwe-methyl hydroxyethyl cellulose dosage (ifomula yasehlotyeni), ukwakhiwa kunye nokumelana nokuqhekeka akukwazi ukuhlangabezana neemfuno zokusetyenziswa. Ngokusebenzisa unyango olukhethekileyo lwe-MC, olufana nokunyusa izinga le-etherification, umphumo wokugcinwa kwamanzi we-MC unokugcina umphumo ongcono phantsi kobushushu obuphezulu, ukwenzela ukuba unokubonelela ngokusebenza okungcono phantsi kweemeko ezinzima.
Ixesha lokuposa: May-18-2022