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.
Inkqubo yokuvelisa i-HPMC ikakhulu yimveliso ye-ether esekelwe kwi-polysaccharide eveliswa yi-alkalization kunye ne-etherification yefayibha yomqhaphu (yasekhaya). Ayinatshaja ngokwayo, ayisebenzi kunye nee-ion ezitshajiweyo kwizinto ze-gelling, 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 i-viscosity iphezulu. I-viscosity yiparameter ebalulekileyo yokusebenza kwe-HPMC. Okwangoku, abavelisi abahlukeneyo be-HPMC basebenzisa iindlela kunye nezixhobo ezahlukeneyo ukulinganisa i-viscosity ye-HPMC. Iindlela eziphambili yiHaakeRotovisko, iHoppler, i-Ubbelohde kunye neBrookfield.
Kwimveliso efanayo, iziphumo ze-viscosity ezilinganiswa ngeendlela ezahlukeneyo zahlukile kakhulu, kwaye ezinye zide zahluke kabini. Ke ngoko, xa kuthelekiswa i-viscosity, kufuneka yenziwe phakathi kweendlela zovavanyo ezifanayo, kubandakanya ubushushu, i-rotor, njl. Ngokuphathelele ubungakanani be-particle, okukhona i-particle incinci, kokukhona i-water retention ingcono. Emva kokuba amasuntswana amakhulu e-cellulose ether edibana namanzi, umphezulu uyanyibilika ngoko nangoko kwaye wenze i-gel yokusonga izinto ukuthintela iimolekyuli zamanzi ukuba zingaqhubeki nokungena. Ngamanye amaxesha ayinakusasazwa ngokulinganayo kwaye ichithwe nasemva kokuxutywa ixesha elide, yenze isisombululo se-flocculent esinamafu okanye i-agglomeration. Ichaphazela kakhulu ukugcinwa kwamanzi kwe-cellulose ether, kwaye ukunyibilika yenye yezinto ezibangela ukukhetha i-cellulose ether.
Ubunzima bukwayindlela ebalulekileyo yokusebenza kwe-methyl cellulose ether. I-MC esetyenziselwa umgubo owomileyo kufuneka ibe yi-powder, enomthamo wamanzi aphantsi, kwaye ubunzulu bukwafuna i-20% ~ 60% yobukhulu be-particle ukuba ibe ngaphantsi kwe-63um. Ubunzima buchaphazela ukunyibilika kwe-hydroxypropyl methylcellulose ether. I-MC ecolekileyo idla ngokuba yi-granular, kwaye kulula ukuyinyibilikisa emanzini ngaphandle kokuhlanganiswa, kodwa izinga lokunyibilika licotha kakhulu, ngoko ke ayifanelekanga ukusetyenziswa kumgubo owomileyo.
Kwi-dry powder mortar, i-MC isasazwa phakathi kwezinto zokufaka isamente ezifana ne-aggregate, i-fine filler kunye nesamente, kwaye yi-powder entle ngokwaneleyo kuphela enokuthintela i-methyl cellulose ether agglomeration xa ixutywa namanzi. Xa i-MC yongezwa ngamanzi ukuze inyibilikise ii-agglomerates, kunzima kakhulu ukuyichitha nokuyinyibilikisa. Ubunzima be-MC abupheleli nje ekuchitheni imali, kodwa bunciphisa namandla engingqi ye-mortar. Xa i-dry powder mortar enjalo isetyenziswa kwindawo enkulu, isantya sokulungisa se-dry powder mortar yasekuhlaleni siya kuncipha kakhulu, kwaye imingxunya iya kuvela ngenxa yamaxesha ahlukeneyo okulungisa. Kwi-dry mortar etshiziweyo ngokwakhiwa koomatshini, imfuneko yokuqina iphezulu ngenxa yexesha elifutshane lokuxuba. Ngokubanzi, i-viscosity ephezulu, kokukhona isiphumo sokugcina amanzi singcono. Nangona kunjalo, i-viscosity ephezulu kwaye ubunzima be-molecular ye-MC buphezulu, ukwehla kokunyibilika kwayo kuya kuba nefuthe elibi kumandla kunye nokusebenza kokwakha kwe-mortar.
Okukhona i-viscosity iphezulu, kokukhona isiphumo sokutyeba kwi-mortar sibonakala ngakumbi, kodwa asilingani ngokuthe ngqo. Okukhona i-viscosity iphezulu, kokukhona i-mortar emanzi iya kuba ne-viscous ngakumbi, oko kukuthi, ngexesha lokwakha, ibonakaliswa njengokunamathela kwi-scraper kunye nokunamathela okuphezulu kwi-substrate. Kodwa akuncedi ukwandisa amandla olwakhiwo lwe-mortar emanzi ngokwayo. Oko kukuthi, ngexesha lokwakha, 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 ngokunyuka kobushushu. Nangona kunjalo, kwizicelo zezinto ezibonakalayo, i-dry powder mortar idla ngokusetyenziswa kwiindawo ezishushu kumaqondo obushushu aphezulu (angaphezulu kwama-40 degrees) kwiindawo ezininzi, ezifana ne-outer wall putty plastering phantsi kwelanga ehlotyeni, nto leyo edla ngokukhawulezisa ukucocwa kwesamente kunye nokuqina kwe-dry powder mortar. Ukwehla kwesantya sokugcinwa kwamanzi kukhokelela kwimvakalelo ecacileyo yokuba zombini ukusebenza kunye nokumelana nokuqhekeka kuyachaphazeleka, kwaye kubaluleke kakhulu ukunciphisa impembelelo yezinto zobushushu phantsi kwale meko.
Ngokuphathelele oku, izongezo ze-methyl hydroxyethyl cellulose ether okwangoku zithathwa njengeziphambili kuphuhliso lwetekhnoloji. Nangona ubungakanani be-methyl hydroxyethyl cellulose bunyuswa (ifomula yasehlotyeni), ukusebenza kakuhle kunye nokumelana nokuqhekeka akukakwazi ukuhlangabezana neemfuno zokusetyenziswa. Ngonyango oluthile olukhethekileyo kwi-MC, njengokunyusa izinga le-etherification, njl.njl., isiphumo sokugcina amanzi sinokugcinwa kubushushu obuphezulu, ukuze sikwazi ukubonelela ngokusebenza okungcono phantsi kweemeko ezinzima.
Umthamo we-HPMC akufuneki ube phezulu kakhulu, kungenjalo uya kunyusa imfuno yamanzi kwi-mortar, uya kunamathela kwi-trowel, kwaye ixesha lokuseta liza kuba lide kakhulu, nto leyo eya kuchaphazela ukwakhiwa. 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. Okwangoku, abathengisi abaninzi abangathembekanga bayayiqinisa i-HPMC, kwaye umgangatho awukho mhle kakhulu. Xa ukhetha i-cellulose ethile, ilebhu kufuneka yenze umsebenzi olungileyo kuvavanyo ukuqinisekisa uzinzo lwemveliso ye-mortar, kwaye ungabi nomdla wokufumana ixabiso eliphantsi kwaye ubangele ilahleko ezingeyomfuneko.
Ixesha lokuthumela: Meyi-04-2023