Igama lesiTshayina le-HPMC yi-hydroxypropyl methylcellulose. Ayisiyo-ionic kwaye idla ngokusetyenziswa njenge-arhente yokugcina amanzi kwi-mortar exutywe nomileyo. Yeyona nto isetyenziswa kakhulu yokugcina amanzi kwi-mortar. Yimveliso ye-ether esekelwe kwi-polysaccharide eyenziwe yi-alkalization kunye ne-etherification. Ayinatshaja ngokwayo, ayisebenzi nee-ion ezitshajiweyo kwi-gelling material, kwaye isebenza ngokuzinzileyo. Ixabiso layo liphantsi kunezinye iintlobo ze-cellulose ethers, ngoko ke isetyenziswa kakhulu kwi-mortar exutywe nomileyo.
Umsebenzi we-hydroxypropyl methylcellulose: Ingenza i-mortar exutyiweyo ibe nkulu ukuze ibe ne-viscosity ethile emanzi kwaye ithintele ukwahlulwahlulwa. (Ukuqina) Ukugcinwa kwamanzi nakolona phawu lubalulekileyo, olunceda ukugcina ubungakanani bamanzi akhululekileyo kwi-mortar, ukuze emva kokuba i-mortar yenziwe, izinto eziqinisa i-cement zinexesha elingakumbi lokufumisa. (Ukugcinwa kwamanzi) Ineempawu zokungenisa umoya, ezinokungenisa amaqamza omoya afanayo nacolekileyo ukuphucula ukwakhiwa kwe-mortar.
Okukhona i-viscosity ye-hydroxypropyl methylcellulose ether iphezulu, kokukhona ukusebenza kokugcinwa kwamanzi kuphucuka. Kwimveliso efanayo, iziphumo ze-viscosity ezilinganiswa ngeendlela ezahlukeneyo zahlukile kakhulu, kwaye ezinye zide zibe nomahluko ophindwe kabini. Ke ngoko, xa kuthelekiswa i-viscosity, kufuneka yenziwe phakathi kweendlela zovavanyo ezifanayo, kubandakanya ubushushu, i-rotor, njl.
Ngokuphathelele ubungakanani besuntswana, okukhona isuntswana licolekile, kokukhona ukugcinwa kwamanzi kubhetele. Emva kokuba amasuntswana amakhulu e-cellulose ether edibana namanzi, umphezulu uyanyibilika ngoko nangoko uze wenze ijeli yokusonga izinto ukuze kuthintelwe ukuba iimolekyuli zamanzi zingaqhubeki zingena. Ngamanye amaxesha ayinakusasazwa ngokulinganayo kwaye ichithwe nasemva kokuxutywa ixesha elide, yenze isisombululo esinamafu okanye i-agglomeration. Ichaphazela kakhulu ukugcinwa kwamanzi e-cellulose ether, kwaye ukunyibilika yenye yezinto ezibangela ukukhetha i-cellulose ether. Ukucotha kukwayindlela ebalulekileyo yokusebenza kwe-methyl cellulose ether. I-MC esetyenziselwa i-dry powder mortar kufuneka ibe yi-powder, enomthamo wamanzi omncinci, kwaye ukucotha kwayo kufuna i-20%-60% yobukhulu besuntswana ukuba ibe ngaphantsi kwe-63um. Ukucotha kuchaphazela ukunyibilika kwe-hydroxypropyl methylcellulose ether. I-coarse MC idla ngokuba yi-granular, kwaye kulula ukuyinyibilikisa emanzini ngaphandle kwe-agglomeration, kodwa izinga lokunyibilika licotha kakhulu, ngoko ke ayifanelekanga ukusetyenziswa kwi-dry powder mortar. Kwi-dry powder mortar, i-MC isasazwa phakathi kwezinto zokufaka isamente ezifana ne-aggregate, i-fine filler kunye nesamente, kwaye yi-fine enokwanela kuphela enokuthintela i-methyl cellulose ether agglomeration xa ixutywa namanzi.
Ngokubanzi, okukhona i-viscosity iphezulu, kokukhona isiphumo sokugcina amanzi singcono. Nangona kunjalo, okukhona i-viscosity iphezulu kwaye ubunzima be-molecular ye-MC buphezulu, ukwehla kokunyibilika kwayo kuya kuba nefuthe elibi kumandla kunye nokusebenza kolwakhiwo lwe-mortar. Okukhona i-viscosity iphezulu, kokukhona isiphumo sokutyeba sibonakala ngakumbi kwi-mortar, kodwa ayilingani ngokuthe ngqo. Okukhona i-viscosity iphezulu, kokukhona i-mortar emanzi iya kuba ne-viscous ngakumbi, oko kukuthi, ngexesha lokwakhiwa, ibonakaliswa njengokunamathela kwi-scraper kunye nokunamathela okuphezulu kwi-substrate. Kodwa akuncedi ukwandisa amandla olwakhiwo lwe-mortar emanzi ngokwayo. Oko kukuthi, ngexesha lokwakhiwa, ukusebenza okuchasene nokuhla akubonakali. Ngokwahlukileyo koko, ezinye i-viscosity ephakathi nephantsi kodwa i-modified methyl cellulose ethers zisebenza kakuhle ekuphuculeni amandla olwakhiwo lwe-mortar emanzi.
Ukugcinwa kwamanzi kwe-HPMC kukwanxulumene nobushushu obusetyenziswayo, kwaye ukugcinwa kwamanzi kwe-methyl cellulose ether kuncipha ngokonyuka kobushushu. Nangona kunjalo, xa kusetyenziswa izinto ezibonakalayo, i-dry powder mortar idla ngokusetyenziswa kwiindawo ezishushu kumaqondo obushushu aphezulu (angaphezulu kwama-40 degrees) kwiindawo ezininzi, njengokuplasta i-outer wall putty phantsi kwelanga ehlotyeni, okuhlala kukhawulezisa ukucocwa kwesamente kunye nokuqina kwe-dry powder mortar. Ukwehla kwezinga lokugcina amanzi kukhokelela kwimvakalelo ecacileyo yokuba zombini ukuchasana nokusebenza kunye nokuqhekeka kuyachaphazeleka, kwaye kubaluleke kakhulu ukunciphisa impembelelo yezinto zobushushu phantsi kwale meko. Kule meko, izongezo ze-methyl hydroxyethyl cellulose ether okwangoku zithathwa njengeziphambili kuphuhliso lobuchwepheshe. Nangona ubungakanani be-methyl hydroxyethyl cellulose bunyuswa (ifomula yasehlotyeni), ukuchasana nokusebenza kunye nokuqhekeka akukwazi ukuhlangabezana neemfuno zokusetyenziswa. Ngonyango oluthile olukhethekileyo kwi-MC, njengokunyusa izinga le-etherification, njl.njl., isiphumo sokugcina amanzi sinokugcinwa kubushushu obuphezulu, ukuze sikwazi ukubonelela ngokusebenza ngcono phantsi kweemeko ezinzima.
Ngokubanzi, i-HPMC inobushushu bejeli, obunokwahlulwahlulwa lube ziintlobo ezingama-60, iintlobo ezingama-65, kunye neentlobo ezingama-75. Kumashishini asebenzisa isanti yomlambo kwi-mortar eqhelekileyo exutyiweyo, kungcono ukusebenzisa i-HPMC yohlobo lwama-75 enobushushu obuphezulu bejeli. Umthamo we-HPMC akufuneki ube phezulu kakhulu, kungenjalo uya kunyusa imfuno yamanzi ye-mortar, uya kunamathela kwi-trowel, kwaye ixesha lokuseta liya kuba lide kakhulu, nto leyo eya kuchaphazela ukwakhiwa kwayo. Iimveliso ezahlukeneyo ze-mortar zisebenzisa i-HPMC ene-viscosities ezahlukeneyo, kwaye azisebenzisi i-HPMC ene-viscosity ephezulu ngokungakhathali. Ke ngoko, nangona iimveliso ze-hydroxypropyl methylcellulose zilungile, ziyanconywa xa zisetyenziswa kakuhle. Ukukhetha i-HPMC efanelekileyo luxanduva oluphambili lwabasebenzi belabhoratri yeshishini.
Ixesha lokuthumela: Epreli-12-2023