Iimveliso zesamente, ezifana nekhonkrithi, udaka, kunye nezinye izinto zokwakha, zisetyenziswa kakhulu kwizakhiwo zanamhlanje. Ii-cellulose ethers (ezifana ne-hydroxypropyl methylcellulose (HPMC), i-hydroxyethyl methylcellulose (HEMC), njl.njl.) zezona zongezo zibalulekileyo ezinokuphucula kakhulu ukusebenza kweemveliso zesamente. Ukuze kufezekiswe ezi mpawu zibalaseleyo, kubalulekile ukuba nobuchule kunye nokulawula ukusebenza kwee-cellulose ethers.
1. Iipropati ezisisiseko kunye nemisebenzi ye-cellulose ethers
Ii-cellulose ethers ziluhlobo lweekhemikhali eziphuma kwi-cellulose yendalo, apho iqela le-hydroxyl lithathelwa indawo ngokuyinxenye liqela le-ether ngokusebenzisa i-etherification reaction. Iindidi ezahlukeneyo zee-cellulose ethers zinokwenziwa ngokwehlobo kunye nenani lezinto ezithatha indawo, kwaye uhlobo ngalunye lunendima eyahlukileyo kwimveliso yesamente.
Ukuqina kwee-ether ze-cellulose:
Ukuqina kwee-ether ze-cellulose kuchaphazela ngokuthe ngqo i-rheology kunye nokuzinza kwe-cement paste. Ii-ether ze-cellulose ezine-viscosity ephezulu zinokuphucula ukugcinwa kwamanzi kunye namandla okubopha kwe-paste, kodwa zinokunciphisa ukunyibilika kwayo. Ii-ether ze-cellulose ezine-viscosity ephantsi zinceda ukuphucula ukusebenza kunye nokunyibilika.
Umlinganiselo wokutshintshwa (DS) kunye nokutshintshwa kwe-molar (MS):
Ubungakanani bokutshintshwa kunye nokutshintshwa kwe-molar yee-cellulose ethers bumisela ukunyibilika kwayo kunye nokuqina kwesisombululo. Ubungakanani bokutshintshwa kunye nokutshintshwa kwe-molar ephezulu ngokuqhelekileyo kunokuphucula ukugcinwa kwamanzi kunye nokuzinza kwee-cellulose ethers.
Ukunyibilika kwee-ether ze-cellulose:
Izinga lokunyibilika kunye nokunyibilika kwee-ether ze-cellulose kuchaphazela ukufana kwe-cement paste. Ii-ether ze-cellulose ezinyibilikayo kakuhle zinokwenza isisombululo esifanayo ngokukhawuleza, ngaloo ndlela ziqinisekisa ukufana kunye nokuzinza kwe-paste.
2. Khetha ii-ether ze-cellulose ezifanelekileyo
Iimeko ezahlukeneyo zokusetyenziswa zineemfuno ezahlukeneyo zokusebenza kwee-cellulose ethers. Ukukhetha uhlobo olufanelekileyo kunye neenkcukacha ze-cellulose ether kunokuphucula kakhulu ukusebenza kweemveliso zesamente:
Izibophelelo:
Kwizicelo ezifana nezincamathelisi zethayile kunye neemortars zeplasta, ii-ethers ze-cellulose ezine-viscosity ephezulu (ezifana ne-HPMC) zinokubonelela ngokunamathela okungcono kunye nokufuma okuhlala ixesha elide, ngaloo ndlela ziphucula ukusebenza kolwakhiwo kunye namandla okugqibela okubopha.
Izinto zokugcina amanzi:
Kwiimortars ezizilinganisa ngokwazo kunye nee-adhesives zethayile ezisekwe kwisamente, kufuneka ii-ethers ze-cellulose ezinokugcinwa kwamanzi amaninzi (ezifana ne-HEMC). Ukugcinwa kwamanzi amaninzi kunceda ukuthintela ukulahleka kwamanzi ngaphambi kwexesha, ngaloo ndlela kuqinisekisa ukusabela okwaneleyo komswakama kunye nexesha elide lokusebenza.
Izixhobo zokuqinisa:
Ii-cellulose ethers ezisetyenziselwa ukomeleza amandla eemveliso zesamente kufuneka zibe nokusasazeka kakuhle kunye ne-viscosity ephakathi ukuze zomeleze ukufana kunye namandla e-matrix.
3. Lungiselela indlela yokongeza
Ukulawula indlela yokongeza i-cellulose ether kwiimveliso zesamente kubalulekile ukuze isebenze kakuhle. Nazi iindlela ezininzi eziqhelekileyo zokuphucula:
Indlela yokuxuba kwangaphambili:
Xuba i-cellulose ether nezinye izinto zomgubo owomileyo kwangaphambili. Le ndlela ingathintela ukwakheka kwe-cellulose ether emva kokudibana ngqo namanzi, ngaloo ndlela iqinisekise ukusasazeka kwayo ngokulinganayo kwi-slurry.
Indlela yokuxuba ngamanzi:
Yongeza i-cellulose ether kwi-slurry yesamente kancinci kancinci. Le ndlela ifanelekile kwimeko apho i-cellulose ether inyibilika ngokukhawuleza kwaye inceda ekwenzeni i-suspension ezinzileyo.
Indlela yokudibanisa ngokwezigaba:
Kwinkqubo yokulungiselela i-slurry yesamente, ukongeza i-cellulose ether kwiinxalenye kunokuqinisekisa ukusasazwa kwayo ngokulinganayo kuyo yonke inkqubo yokulungiselela kwaye kuncitshiswe ukuhlangana.
4. Lawula izinto zangaphandle
Izinto zangaphandle ezifana nobushushu, ixabiso le-pH, kunye nesantya sokushukumisa zinempembelelo enkulu ekusebenzeni kwe-cellulose ether.
Ulawulo lobushushu:
Ukunyibilika kunye nokuxinana kwe-cellulose ether kubuthathaka kakhulu kubushushu. Amaqondo obushushu aphezulu anceda i-cellulose ether ukuba inyibilike ngokukhawuleza, kodwa anokubangela ukuba ukuxinana kwesisombululo kunciphe. Amaqondo obushushu kufuneka ahlengahlengiswe ngokwemeko ethile yokusetyenziswa ukuqinisekisa ukusebenza kakuhle.
Uhlengahlengiso lwe-pH: Ixabiso le-pH ye-cement paste lidla ngokuba kuluhlu oluphezulu lwe-alkaline, ngelixa ukunyibilika kunye ne-viscosity ye-cellulose ether kutshintshatshintsha ngokutshintsha kwexabiso le-pH. Ukulawula ixabiso le-pH ngaphakathi koluhlu olufanelekileyo kunokuzinzisa ukusebenza kwe-cellulose ether.
Izinga lokuxukuxa: Izinga lokuxukuxa lichaphazela isiphumo sokusasazeka kwe-cellulose ether kwi-samente paste. Izinga lokuxukuxa eliphezulu kakhulu linokubangela ukungena komoya kunye nokuhlanganiswa kwe-cellulose ether, ngelixa izinga lokuxukuxa eliphakathi linceda ukusasaza ngokulinganayo kunye nokunyibilikisa i-cellulose ether.
5. Uhlalutyo lwetyala kunye neengcebiso ezisebenzayo
Ngohlalutyo lwamatyala okwenyani, sinokuqonda ngakumbi indlela yokusebenzisa kunye nokwenza ngcono icebo le-cellulose ether kwiimveliso ezahlukeneyo zesamente:
I-adhesive yethayile esebenza kakuhle: Xa inkampani yayisenza i-adhesive yethayile esebenza kakuhle, kwafunyaniswa ukuba ukugcinwa kwamanzi kwimveliso yokuqala kwakunganelanga, nto leyo eyabangela ukwehla kwamandla okubopha emva kokwakhiwa. Ngokuzisa i-HEMC egcina amanzi amaninzi kunye nokulungisa ubungakanani bayo bokongeza kunye nendlela yokongeza (kusetyenziswa indlela yokuxuba kwangaphambili), ukugcinwa kwamanzi kunye namandla okubopha kwe-adhesive yethayile kwaphuculwa ngempumelelo.
Izinto zomgangatho ezizilinganisayo: Izinto zomgangatho ezizilinganisayo ezisetyenzisiweyo kwiprojekthi ethile bezinobumanzi obuphantsi kunye nobumanzi obuphantsi emva kokwakhiwa. Ngokukhetha i-HPMC ene-viscosity ephantsi kunye nokwenza ngcono isantya sokuxukuxa kunye nolawulo lobushushu, ubumanzi kunye nokusebenza kolwakhiwo lwe-slurry kuyaphucuka, okwenza umphezulu wokugqibela ube mpuluswa.
Ukulawula ukusebenza kwe-cellulose ether kwiimveliso zesamente ngundoqo ekuphuculeni ukusebenza kwezinto kunye nomgangatho wokwakha. Ngokukhetha uhlobo olufanelekileyo lwe-cellulose ether, ukuphucula indlela yokongeza, kunye nokulawula izinto ezichaphazela ngaphandle, iimpawu eziphambili zeemveliso zesamente ezifana nokugcinwa kwamanzi, ukunamathela, kunye nokugeleza kwamanzi zinokuphucuka kakhulu. Kwizicelo ezisebenzayo, kuyimfuneko ukuqhubeka nokwenza ngcono kunye nokulungisa ukusetyenziswa kwe-cellulose ether ngokweemfuno ezithile kunye neemeko zokusetyenziswa ukuze kufezekiswe iziphumo ezilungileyo.
Ixesha leposi: Juni-26-2024