Ibaluleke kangakanani i-viscosity ye-methyl cellulose ether kwi-gypsum mortar?

Ibaluleke kangakanani i-viscosity ye-methyl cellulose ether kwi-gypsum mortar?

Impendulo: I-Viscosity yiparameter ebalulekileyo yokusebenza kwe-methyl cellulose ether.

Ngokuqhelekileyo, okukhona i-viscosity iphezulu, kokukhona isiphumo sokugcina amanzi kwi-gypsum mortar. Nangona kunjalo, ukuphakama kwe-viscosity, ukuphakama kwe-molecular weight ye-methyl cellulose ether, kunye nokuncipha 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 udaka olumanzi luya kuba. Ngethuba lokwakhiwa, kubonakaliswa njengokunamathela kwi-scraper kunye nokunamathela okuphezulu kwi-substrate. Kodwa akuncedi ukunyusa amandla esakhiwo sodaka olumanzi ngokwalo. Ukongezelela, ngexesha lokwakhiwa, ukusebenza kwe-anti-sag yodaka olumanzi alubonakali. Ngokuchasene noko, i-viscosity ethile ephakathi kunye nephantsi kodwa i-methyl cellulose ethers elungisiweyo inomsebenzi ogqwesileyo ekuphuculeni amandla okwakhiwa kodaka olumanzi.

Kubaluleke kangakanani ukucolwa kwe-cellulose ether kudaka?

Impendulo: I-fineness ikwayisalathisi sokusebenza esibalulekileyo se-methyl cellulose ether. I-MC esetyenziselwa udaka lwepowder eyomileyo iyadingeka ukuba ibe ngumgubo kunye nomxholo wamanzi aphantsi, kwaye i-fineness nayo ifuna i-20% ukuya kwi-60% ye-particle size ibe ngaphantsi kwe-63m. Ukucoleka kuchaphazela ukunyibilika kwe-methyl cellulose ether. I-coarse MC idla ngokuba yigranular, ekulula ukuyichitha kunye nokunyibilika emanzini ngaphandle kwe-agglomeration, kodwa isantya sokuchithwa sicotha kakhulu, ngoko asifanelekanga ukusetyenziswa kwi-powder mortar. Ezinye iimveliso zasekhaya zi-flocculent, akulula ukuba zisasazwe kwaye zinyibilike emanzini, kwaye kulula ukuzidibanisa. 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 MC ayinayo nje inkcitho, kodwa inciphisa amandla asekuhlaleni odaka. Xa udaka olomileyo lwepowder lusetyenziswa kwindawo enkulu, isantya sokunyanga sodaka lwendawo siya kuncitshiswa kakhulu, kwaye iintanda ziya kubonakala ngenxa yamaxesha ahlukeneyo okuphilisa. Ngodaka olutshiziweyo olunokwakhiwa ngoomatshini, imfuno yokucoca iphezulu ngenxa yexesha elifutshane lokuxuba.

Ukucoleka kwe-MC kukwanefuthe elithile ekugcineni amanzi. Ngokubanzi, kwi-methyl cellulose ethers ezineviscosity efanayo kodwa ukucoleka okwahlukileyo, phantsi komyinge wokongeza ofanayo, kokukhona ucoleka kokukhona kungcono ugcino lwamanzi.

Yintoni indlela yokukhetha i-cellulose?

Impendulo: Ubungakanani be-ether ye-cellulose esetyenziswa kwizicelo ezahlukeneyo zisekelwe ikakhulu kwimfuno yokugcinwa kwamanzi. Ifanele zonke iintlobo zodaka. Iisubstrates ezifunxa kakhulu zifuna izixa eziphezulu ze-cellulose ether. Udaka olunokuhanjiswa kobungakanani besuntswana elifanayo kwaye ngaloo ndlela indawo enkulu yomphezulu ikwafuna izixa eziphezulu ze-cellulose ether.

Iinkcukacha ezilungisiweyo zinokukhethwa kwiimfuno zokuchasana nokuncipha. Ukuba ukuguqulwa akwanelanga, i-starch ethers, ngokuqhelekileyo i-hydroxypropyl starch ethers, inokongezwa ukukhusela i-sags.

Isixa esipheleleyo kunye nobukhulu beqhekeza lokuzalisa ekuqulunqweni kufuneka kukhethwe ukubonelela ngokukhawuleza kunye nokuhambelana kakuhle.

Ukuxuba i-gypsum, i-filler, uhlobo kunye nobuninzi be-ether ye-cellulose kunye nendlela yokusebenzisa i-ether ye-starch kufuneka zidibaniswe nezi ndlela zilandelayo:

Xa udaka oluxutyiweyo olomileyo ludityaniswe kumlinganiselo othile wamanzi, inani elongezelelweyo lisekelwe kumlinganiselo wamanzi, kwaye onke amanzi axutywe ngaphandle kokuphazamisa umgubo owomileyo kunye nomlinganiselo ochanekileyo wamanzi-ukunamathisela. Ukuba izithako ezahlukeneyo zixutywe ngomlinganiselo ochanekileyo, ngoko sinokufumana umdaka ococekileyo kunye neempawu ezifanelekileyo zesicelo emva kokuxuba.

Zeziphi izilungiso kwisakhiwo segypsum yiarhente yokugcina amanzi?

Impendulo: Izixhobo zodonga lolwakhiwo luninzi lwezakhiwo ezinemingxuma, kwaye zonke zinomfunxa owomeleleyo wamanzi. Nangona kunjalo, izinto zokwakha ze-gypsum ezisetyenziselwa ukwakhiwa kweendonga zilungiswa ngokugalela amanzi eludongeni, kwaye amanzi athatyathwa lula eludongeni, okubangela ukungabikho kwamanzi ayimfuneko kwi-hydration ye-gypsum, okubangela ubunzima ekwakhiweni kokutyabeka kunye nokunciphisa. amandla bond, okubangela iintanda, Iingxaki zoMgangatho ezifana nemingxuma kunye nokuxobula. Ukuphucula ukugcinwa kwamanzi kwizixhobo zokwakha ze-gypsum kunokuphucula umgangatho wokwakha kunye namandla okudibanisa nodonga. Ke ngoko, iarhente yokugcina amanzi ibe yenye yezinto ezixubeneyo ezibalulekileyo zezinto zokwakha zegypsum.

Iiarhente ezisetyenziswa ngokuqhelekileyo zokugcina amanzi kwilizwe lam yi-carboxymethyl cellulose kunye ne-methyl cellulose. Ezi zixhobo zimbini zokugcina amanzi ziphuma kwi-ether ye-cellulose. Bonke banomsebenzi ongaphezulu, kwaye kukho amaqela e-hydrophilic kunye ne-hydrophobic kwiimolekyuli zabo, ezine-emulsification, i-colloid yokukhusela kunye nokuzinza kwesigaba. Ngenxa ye-viscosity ephezulu yesisombululo sayo samanzi, xa ifakwe kumdaka ukuze kugcinwe umthamo ophezulu wamanzi, inokuthintela ngokufanelekileyo ukugqithiswa kwamanzi ngokugqithiseleyo nge-substrate (njengezitena, ikhonkrithi, njl.) kunye nokunciphisa izinga lokunyuka kwamanzi. yamanzi, ngaloo ndlela idlala indima kwisiphumo sogcino lwamanzi. I-Methyl cellulose ngumxube ofanelekileyo we-gypsum odibanisa ukugcinwa kwamanzi, ukuqina, ukuqinisa kunye nokuqina, kodwa ixabiso liphezulu kakhulu. Ngokuqhelekileyo, i-ejenti enye yokugcina amanzi ayikwazi ukufikelela kwisiphumo esifanelekileyo sokugcina amanzi, kwaye ukudibanisa i-agent ehlukeneyo yokugcina amanzi ayikwazi nje ukuphucula umphumo wokusetyenziswa, kodwa nokunciphisa iindleko ze-gypsum-based based materials.

Ukugcinwa kwamanzi kuchaphazela njani iipropati ze-gypsum composite cementitious materials?

Impendulo: Izinga lokugcinwa kwamanzi liyenyuka kunye nokongezwa kwe-methyl cellulose ether kuluhlu lwe-0.05% ukuya kwi-0.4%. Xa isixa-mali esongeziweyo sisanda, indlela yokwandisa ugcino lwamanzi yehla.