Igama lesiTshayina le-HPMC yi-hydroxypropyl methylcellulose. Ayina-ionic kwaye isoloko isetyenziswa njengesixhobo sokugcina amanzi kudaka oluxutyiweyo. Yeyona nto isetyenziswa ngokuqhelekileyo ukugcina amanzi kwidaka. Imveliso ye-ether esekwe kwi-polysaccharide eveliswa yi-alkalization kunye ne-etherification. Ayinayo intlawulo ngokwayo, ayiphenduli nge-ion ehlawulisiweyo kwizinto eziphathekayo ze-gelling, kwaye inomsebenzi ozinzile. Ixabiso liphantsi kunezinye iintlobo ze-cellulose ethers, ngoko ke isetyenziswa ngokubanzi kwi-dry-mixed mortar.
Umsebenzi we-hydroxypropyl methylcellulose: Iyakwazi ukujiyisa udaka oluxutywe ngokutsha ukuze lube ne-viscosity ethile emanzi kwaye ithintele ulwahlulo. (Thickening) Ukugcinwa kwamanzi kukwayeyona nto ibaluleke kakhulu, enceda ukugcina ubuninzi bamanzi akhululekile kumdaka, ukwenzela ukuba emva kokuba udaka lwakhiwe, izinto ze-cementitious zinexesha elingakumbi lokukhupha amanzi. (Ukugcinwa kwamanzi) Ineempawu zokungenisa umoya, ezinokuzisa amaqamza afanayo kunye nelungileyo ukuphucula ukwakhiwa kodaka.
Okukhona iphezulu i-viscosity ye-hydroxypropyl methylcellulose ether, kokukhona ukugcinwa kwamanzi kube ngcono. 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.
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. Oko kukuthi, 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.
Ukugcinwa kwamanzi kwe-HPMC kukwanxulumene nobushushu obusetyenzisiweyo, kwaye ukugcinwa kwamanzi kwe-methyl cellulose ether kuncipha ngokunyuka kwamaqondo obushushu. Nangona kunjalo, ekufakweni kwezinto ezibonakalayo, udaka olomileyo lomgubo luhlala lusetyenziswa kwiindawo ezishushu ezishushu kumaqondo obushushu aphezulu (angaphezulu kwama-40 degrees) kwiindawo ezininzi, njengokutyatyekwa kwe-putty yangaphandle phantsi kwelanga ehlotyeni, ehlala ikhawulezisa ukunyangwa kwesamente kunye nodaka. ukuqina kodaka 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. Ngokubhekiselele koku, izongezo ze-methyl hydroxyethyl cellulose ether okwangoku zithathwa njengeziphambili kuphuhliso lobuchwepheshe. Nangona isixa se-methyl hydroxyethyl cellulose sandisiwe (ifomula yasehlotyeni), ukusebenza kunye nokumelana nokuqhekeka kusenganakho 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.
Ngokubanzi, i-HPMC inobushushu bejeli, enokuthi yahlulwe ngokweendidi ezingama-60, iindidi ezingama-65, kunye neentlobo ezingama-75. Kumashishini asebenzisa isanti yomlambo kudaka oluqhelekileyo oluxutywe, kungcono ukusebenzisa i-HPMC ye-75 kunye nobushushu obuphezulu bejeli. I-dosage ye-HPMC ayifanele ibe phezulu kakhulu, ngaphandle koko iya kwandisa imfuno yamanzi yodaka, iya kubambelela kwi-trowel, kwaye ixesha lokumisela liya kuba lide kakhulu, eliya kuchaphazela ukwakhiwa. Iimveliso zodaka ezahlukeneyo zisebenzisa HPMC kunye viscosities ezahlukeneyo, kwaye musa ukusebenzisa high-viscosity HPMC ngokungakhathali. Ke ngoko, nangona iimveliso ze-hydroxypropyl methylcellulose zilungile, ziyaqhwatyelwa izandla xa zisetyenziswa kakuhle. Ukukhetha i-HPMC efanelekileyo luxanduva oluphambili lwabasebenzi baselabhoratri yeshishini.
Ixesha lokuposa: Apr-07-2023