Ukuphakama kwe-viscosity ye-hydroxypropyl methylcellulose, kungcono ukugcina amanzi. I-Viscosity yiparameter ebalulekileyo yokusebenza kwe-HPMC. Okwangoku, abavelisi abahlukeneyo be-HPMC basebenzisa iindlela ezahlukeneyo kunye nezixhobo zokulinganisa i-viscosity ye-HPMC. Iindlela eziphambili ziHaakeRotovisko, Hoppler, Ubbelohde kunye neBrookfield.
Kwimveliso efanayo, iziphumo ze-viscosity ezilinganiswe ngeendlela ezahlukeneyo zahluke kakhulu, kwaye ezinye zide ziphindwe kabini. Ke ngoko, xa uthelekisa i-viscosity, kufuneka iqhutywe phakathi kweendlela ezifanayo zokuvavanya, kubandakanya ubushushu, i-rotor, njl.
Ngokuphathelele ubungakanani bamasuntswana, incinci incinci, ngcono ukugcinwa kwamanzi. Emva kokuba amasuntswana amakhulu e-cellulose ether adibane namanzi, umphezulu uyanyibilika ngokukhawuleza kwaye wenze ijeli ukusonga izinto zokuthintela iimolekyuli zamanzi ukuba zingaqhubeki nokungena. Ngamanye amaxesha ayinakuchithwa ngokulinganayo kwaye inyibilikiswe nasemva kwexesha elide, ukwenza isisombululo esinamafu okanye i-agglomeration. Ichaphazela kakhulu ukugcinwa kwamanzi kwe-cellulose ether, kunye ne-solubility yenye yezinto zokukhetha i-cellulose ether.
Ukulunga kukwayisalathisi sokusebenza esibalulekileyo se-methyl cellulose ether. I-MC esetyenziselwa udaka lwepowder eyomileyo iyadingeka ukuba ibe ngumgubo, kunye nomxholo wamanzi aphantsi, kwaye ukucolwa kwakhona kufuna i-20% -60% ye-particle size ibe ngaphantsi kwe-63um. Ukucoleka kuchaphazela ukunyibilika kwe-hydroxypropyl methylcellulose ether. I-coarse MC idla ngokuba yigranular, kwaye kulula ukuyinyibilika emanzini ngaphandle kwe-agglomeration, kodwa izinga lokuchithwa licotha kakhulu, ngoko ke ayifanelekanga ukusetyenziswa kwidaka elomileyo lomgubo.
Kwipowder eyomileyo yodaka, i-MC ihlakazekile phakathi kwezinto zesamente ezifana ne-aggregate, i-fine filler kunye nesamente, kwaye kuphela umgubo ococekileyo owaneleyo unokunqanda i-methyl cellulose ether agglomeration xa ixutywa namanzi. Xa i-MC yongezwa ngamanzi ukunyibilikisa i-agglomerates, kunzima kakhulu ukuchithwa kunye nokuchithwa. I-coarse fineness ye-MC ayiyonkcitho nje kuphela, kodwa ikwanciphisa amandla asekuhlaleni odaka. Xa udaka olunjalo olomileyo lusetyenziswa kwindawo enkulu, isantya sokunyanga sodaka lwendawo eyomileyo siya kuncitshiswa kakhulu, kwaye iintanda ziya kubonakala ngenxa yamaxesha ahlukeneyo okuphilisa. Ngodaka olutshiziweyo kunye nokwakhiwa komatshini, imfuno yokucolwa iphezulu ngenxa yexesha elifutshane lokuxuba.
Ngokuqhelekileyo, okukhona i-viscosity iphezulu, ingcono isiphumo sokugcina amanzi. Nangona kunjalo, ukuphakama kwe-viscosity kunye nokuphakama kwe-molecular weight ye-MC, ukuhla okuhambelanayo kwi-solubility yayo kuya kuba nefuthe elibi kumandla kunye nokusebenza kokwakhiwa kodaka. Ukuphakama kwe-viscosity, kuyabonakala ngakumbi umphumo wokuqina kumdaka, kodwa awuhambelani ngokuthe ngqo. Ukuphakama kwe-viscosity, i-viscous ngakumbi i-mortar emanzi iya kuba, oko kukuthi, ngexesha lokwakha, kubonakaliswa njengokunamathela kwi-scraper kunye nokunamathela okuphezulu kwi-substrate. Kodwa akuncedi ukunyusa amandla esakhiwo sodaka olumanzi ngokwalo. Ngexesha lokwakha, ukusebenza kwe-anti-sag akubonakali. Ngokuchasene noko, i-viscosity ethile ephakathi kunye nephantsi kodwa i-methyl cellulose ethers elungisiweyo inomsebenzi ogqwesileyo ekuphuculeni amandla okwakhiwa kodaka olumanzi.
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, phantsi komyinge wokongeza ofanayo, kokukhona ucoleka kokukhona kungcono ugcino lwamanzi.
Ukugcinwa kwamanzi kwe-HPMC kukwanxulumene nobushushu obusetyenzisiweyo, kwaye ukugcinwa kwamanzi kwe-methyl cellulose ether kuncipha ngokunyuka kwamaqondo obushushu. Nangona kunjalo, kwizinto ezisetyenziswayo, udaka olomileyo lomgubo luhlala lusetyenziswa kwiindawo ezishushu kumaqondo obushushu aphezulu (angaphezulu kwama-40 degrees) kwiindawo ezininzi, ezinje ngodonga lwangaphandle lokutyatyekwa phantsi kwelanga ehlotyeni, oluhlala lukhawulezisa Ukunyangwa kwesamente kunye nokuqina kwesamente. udaka olomileyo lomgubo.
Ukwehla kwezinga lokugcinwa kwamanzi kukhokelela kwimvakalelo ecacileyo yokuba zombini ukusebenza kunye nokumelana nokuqhekeka kuchaphazeleka, kwaye kubaluleke kakhulu ukunciphisa impembelelo yobushushu phantsi kwesi simo. Nangona i-methyl hydroxyethyl cellulose ether additives okwangoku ithathwa njengeyona nto iphambili ekuphuhlisweni kwezobuchwepheshe, ukuxhomekeka kwabo kwiqondo lokushisa kuya kukhokelela ekubeni buthathaka kokusebenza kodaka olomileyo lomgubo.
Ukwandisa umthamo we-methyl hydroxyethyl cellulose, ukusebenza kunye nokumelana nokuqhekeka akukwazi ukuhlangabezana neemfuno zokusetyenziswa. Ngonyango oluthile olukhethekileyo kwi-MC, olufana nokwandisa iqondo le-etherification, njl., isiphumo sokugcinwa kwamanzi sinokugcinwa kwiqondo lokushisa eliphezulu, ukuze linike ukusebenza okungcono phantsi kweemeko ezinzima.
Ixesha lokuposa: Apr-10-2023