Ukuphakama kwe-viscosity ye-hydroxypropyl methylcellulose, kungcono ukugcina amanzi. I-Viscosity yiparameter ebalulekileyo yokusebenza kwe-HPMC. Okwangoku, abavelisi be-HPMC abahlukeneyo basebenzisa iindlela ezahlukeneyo kunye nezixhobo zokulinganisa i-viscosity ye-HPMC. Iindlela eziphambili zeHaake Rotovisko, Hoppler, Ubbelohde kunye neBrookfield.
Kwimveliso efanayo, iziphumo ze-viscosity ezilinganiswe ngeendlela ezahlukeneyo ziyahluka kakhulu, kwaye ezinye ziphindwe kabini. Ke, xa uthelekisa i-viscosities, qiniseka ukuba uyenza phakathi kweendlela ezifanayo zovavanyo, kubandakanya ubushushu, i-spindle, njl.
Ngokuphathelele ubungakanani bamasuntswana, i-finely particles, ngcono ukugcinwa kwamanzi. Xa iinqununu ezinkulu ze-cellulose ether zidibana namanzi, umphezulu uchitha ngokukhawuleza ukwenza i-gel, egubungela izinto eziphathekayo kwaye ithintele ukungena ngokuqhubekayo kwama-molecule amanzi. . Ichaphazela kakhulu isiphumo sokugcinwa kwamanzi kwi-ether cellulose, kwaye ukunyibilika yenye yezinto ekukhetheni i-cellulose ether. Ukulunga kukwasisalathisi somsebenzi obalulekileyo we-methylcellulose ether. I-MC esetyenziswa kudaka olomileyo kufuneka ibe ngumgubo, ibe nomthamo ophantsi wokufuma, kwaye ukucoleka kukwafuna i-20% ukuya kwi-60% yesayizi yamasuntswana ukuba ibe ngaphantsi kwe-63um. Ukulunga kuchaphazela ukunyibilika kwe-hydroxypropyl methylcellulose ether. I-coarse MC idla ngokuba yigranular kwaye inyibilika ngokulula emanzini ngaphandle kwe-caking, kodwa isantya sokuchithwa sicotha kakhulu, ngoko ke ayifanelekanga ukusetyenziswa kwidaka elomileyo. Kudaka olomileyo, i-MC isasazwe kwizinto zesamente ezifana ne-aggregate, i-fine filler kunye nesamente. Kuphela ngumgubo ocolekileyo ngokwaneleyo oya kuthintela i-methylcellulose ether ekubeni idibane xa ixutywe namanzi. Xa i-MC yongeza amanzi ukunyibilikisa i-aggregates, kunzima ukusabalalisa kunye nokunyibilika. I-MC ene-coarser fineness ayibangeli nje inkunkuma, kodwa inciphisa amandla wendawo yodaka. Xa olu hlobo lodaka olomileyo lwakhiwe phezu kwendawo enkulu, isantya sokunyanga sodaka lwendawo esomileyo siyancipha kakhulu, kwaye ukuqhekeka kwenzeka ngenxa yamaxesha ahlukeneyo okuphilisa. Ukwenza udaka lokutshiza usebenzisa ulwakhiwo lomatshini, ukulunga okuphezulu kuyafuneka ngenxa yexesha elifutshane lokuxuba.
Ngokuqhelekileyo, okukhona i-viscosity iphezulu, ingcono isiphumo sokugcina amanzi. Nangona kunjalo, ukuphakama kwe-viscosity kunye ne-molecular weight ye-MC, ukuhla okuhambelanayo kwi-solubility, enefuthe elibi kumandla kunye nokusebenza kokwakhiwa kodaka. Ukuphakama kwe-viscosity, kuyabonakala ngakumbi umphumo wokuqina wodaka, kodwa awulingani. Okukhona i-viscosity iphezulu, kokukhona udaka olumanzi luncamathele ngakumbi. Iya kunamathela kwi-scraper ngexesha lokwakhiwa kwaye inokubambisana okuphezulu kwi-substrate. Kodwa yenza okuncinci ukunyusa amandla esakhiwo sodaka olumanzi ngokwalo. Ngethuba lenkqubo yokwakha, ukusebenza kwe-anti-sag kwakungabonakali. Ngokwahlukileyo, ezinye i-viscosity ephantsi kodwa i-methylcellulose ethers elungisiweyo ineepropathi ezigqwesileyo ekuphuculeni amandla okwakhiwa kwee-mortars ezimanzi.
Ubuninzi be-ether ye-cellulose eyongeziweyo kwidaka, ngcono ukugcinwa kwamanzi, kunye nokuphakama kwe-viscosity, ngcono ukugcinwa kwamanzi.
Ukucoleka kwe-HPMC nako kunempembelelo ethile kugcino lwamanzi. Ngokubanzi, kwi-methyl cellulose ethers ezineviscosity efanayo kodwa ukucoleka okwahlukileyo, xa isixa esongezelelweyo silingana, okukhona ukucoleka, kokukhona isiphumo sokugcina amanzi singcono.
Ukugcinwa kwamanzi kwe-HPMC kukwanxulumene nobushushu bokusetyenziswa. Ukugcinwa kwamanzi kwe-methylcellulose ether kuncipha njengoko ubushushu bukhula. Nangona kunjalo, kwizinto ezisetyenziswayo, udaka olomileyo luhlala lwakhiwe kwiindawo ezishushu kunye namaqondo obushushu aphezulu (ngaphezu kwama-40 degrees) kwiindawo ezininzi, ezifana nokutyatyekwa kwe-putty kwiindonga zangaphandle phantsi kwelanga lasehlotyeni, okuhlala kukhawulezisa ukuqina kwesamente kunye nokuguquka kombala. isamente. ukuqina. Udaka olomileyo. Ukuncipha kokugcinwa kwamanzi kwenza kucace ukuba ukusebenza kunye nokumelana nokuqhekeka kuya kuchaphazeleka, kwaye kubaluleke kakhulu ukunciphisa ifuthe lezinto zokushisa phantsi kweemeko ezinjalo. Nangona izongezo ze-methylhydroxyethylcellulose ether okwangoku zithathwa njengeziphambili kuphuhliso lobuchwepheshe, ukuxhomekeka kwazo kubushushu kusengakhokelela ekubeni buthathaka kweempawu zodaka olomileyo. Nangona idosi ye-methylhydroxyethylcellulose (ifomula ye-Xia) yonyusiwe, ukuqhubekeka kunye nokumelana nokuqhekeka akukwazanga ukuhlangabezana neemfuno zokusetyenziswa. Ngonyango oluthile olukhethekileyo, olufana nokunyusa izinga le-etherification, njl., i-MC inokugcina ukugcinwa kwamanzi okungcono kumaqondo obushushu aphezulu, ngaloo ndlela inikezela ukusebenza okungcono phantsi kweemeko ezinzima.
Ixesha lokuposa: Feb-06-2024