I-HPMC (ihydroxypropyl methylcellulose)ngumxube wesakhiwo osetyenziswa ngokuqhelekileyo kwaye usetyenziswa kakhulu kudaka lwegypsum. Imisebenzi yayo ephambili kukuphucula ukwakhiwa kodaka, ukuphucula ukugcinwa kwamanzi, ukwandisa ukunamathela kunye nokulungelelanisa iimpawu ze-rheological zodaka. I-Gypsum mortar yinto yokwakha kunye ne-gypsum njengenxalenye ephambili, ehlala isetyenziselwa ukwakhiwa kodonga kunye nesilingi.
1. Impembelelo yedosi ye-HPMC ekugcinweni kwamanzi kwi-gypsum mortar
Ukugcinwa kwamanzi ngenye yeepropati ezibalulekileyo ze-gypsum mortar, ehambelana ngokuthe ngqo nokusebenza kokwakhiwa kunye namandla okubopha udaka. I-HPMC, njengepolymer ephezulu yeemolekyuli, inokugcinwa kakuhle kwamanzi. Iimolekyuli zayo ziqulethe inani elikhulu le-hydroxyl kunye namaqela e-ether. La maqela e-hydrophilic anokwenza iibhondi ze-hydrogen kunye neemolekyuli zamanzi ukunciphisa ukuguquka kwamanzi. Ngoko ke, ukongezwa kwesixa esifanelekileyo se-HPMC kunokuphucula ngokufanelekileyo ukugcinwa kwamanzi omdaka kunye nokuthintela udaka ukuba lome ngokukhawuleza kwaye luqhekeke phezulu ngexesha lokwakha.
Uphononongo lubonise ukuba ngokunyuka kwedosi ye-HPMC, ukugcinwa kwamanzi kodaka ngokuthe ngcembe kuyanda. Nangona kunjalo, xa i-dosage iphezulu kakhulu, i-rheology yomdaka ingaba mkhulu kakhulu, echaphazela ukusebenza kokwakhiwa. Ke ngoko, idosi efanelekileyo ye-HPMC kufuneka ihlengahlengiswe ngokweyona ndlela yokusetyenziswa.
2. Impembelelo yedosi ye-HPMC kumandla okudibanisa kwi-gypsum mortar
Amandla okudibanisa enye intsebenzo ephambili ye-gypsum mortar, echaphazela ngokuthe ngqo ukunamathela phakathi kodaka kunye nesiseko. I-HPMC, njengepolymer ephezulu yeemolekyuli, inokuphucula ukudibanisa kunye nokusebenza kokubambisana kodaka. Ubungakanani obufanelekileyo be-HPMC bunokuphucula ukudibanisa kodaka, ukwenzela ukuba ikwazi ukwenza ukunamathela okunamandla kunye nodonga kunye ne-substrate ngexesha lokwakha.
Uphononongo lovavanyo lubonise ukuba idosi ye-HPMC inefuthe elibonakalayo kumandla okudibanisa udaka. Xa idosi ye-HPMC ingaphakathi koluhlu oluthile (ngokuqhelekileyo i-0.2% -0.6%), amandla okudibanisa abonisa ukunyuka. Oku kungenxa yokuba i-HPMC inokuphucula iplastiki yodaka, ukwenzela ukuba ikwazi ukufaka ngcono i-substrate ngexesha lokwakha kunye nokunciphisa ukuchithwa kunye nokuqhekeka. Nangona kunjalo, ukuba i-dosage iphezulu kakhulu, i-mortar ingaba ne-fluid egqithisileyo, echaphazela ukunamathela kwayo kwi-substrate, ngaloo ndlela inciphisa amandla okudibanisa.
3. Impembelelo yedosi ye-HPMC kumanzi kunye nokusebenza kolwakhiwo lwe-gypsum mortar
I-Fluidity yisalathisi somsebenzi obaluleke kakhulu kwinkqubo yokwakhiwa kwe-gypsum mortar, ngakumbi kulwakhiwo lwendonga enkulu. Ukongezwa kwe-HPMC kunokuphucula ngokubonakalayo umbane wodaka, okwenza kube lula ukwakha nokusebenza. Iimpawu zesakhiwo semolekyuli ye-HPMC yenza ukuba inyuse i-viscosity yodaka ngokujiya, ngaloo ndlela iphucule ukusebenza kunye nokwakhiwa kodaka.
Xa idosi ye-HPMC isezantsi, ukumanzi kodaka kubi, okunokukhokelela kubunzima bokwakha kunye nokuqhekeka. Ubungakanani obufanelekileyo bedosi ye-HPMC (ngokuqhelekileyo phakathi kwe-0.2% -0.6%) inokuphucula umbane wodaka, iphucule ukusebenza kwayo kokugquma kunye nomphumo wokugudisa, kwaye ngaloo ndlela iphucula ukusebenza kakuhle kolwakhiwo. Nangona kunjalo, ukuba idosi iphezulu kakhulu, i-fluidity of mortar iya kuba yi-viscous kakhulu, inkqubo yokwakha iya kuba nzima, kwaye inokukhokelela kwinkunkuma yezinto eziphathekayo.
4. Impembelelo yedosi ye-HPMC ekomiseni ukucutheka kodaka lwegypsum
Ukomisa i-shrinkage yenye ipropati ebalulekileyo ye-gypsum mortar. Ukushwabana okugqithisileyo kunokubangela iintanda eludongeni. Ukongezwa kwe-HPMC kunokunciphisa ngokufanelekileyo ukomisa ukuncipha kodaka. Uphononongo lwafumanisa ukuba isixa esifanelekileyo se-HPMC sinokunciphisa ukuguquka kwamanzi ngokukhawuleza, ngaloo ndlela kuthomalalise ingxaki yokushwabana yokoma kwe-gypsum mortar. Ukongezelela, i-molecular structure ye-HPMC inokwenza isakhiwo sothungelwano esizinzile, siphucule ngakumbi ukuchaswa kokuqhekeka kodaka.
Nangona kunjalo, ukuba idosi ye-HPMC iphezulu kakhulu, inokubangela ukuba udaka lusete ixesha elide, luchaphazela ukusebenza kakuhle kolwakhiwo. Ngelo xesha, i-viscosity ephezulu inokubangela ukusabalalisa okungalinganiyo kwamanzi ngexesha lokwakha, okuchaphazela ukuphuculwa kokunciphisa.
5. Impembelelo yedosi ye-HPMC kwi-crack resistance ye-gypsum mortar
Ukumelana nokuqhekeka luphawu olubalulekileyo lokuvavanya umgangatho we-gypsum mortar. I-HPMC inokuphucula ukuxhathisa kwayo ngokuqhekeka ngokuphucula amandla acinezelayo, ukuncamathela kunye nokuqina kodaka. Ngokudibanisa inani elifanelekileyo le-HPMC, ukuxhathisa ukuqhekeka kwe-gypsum mortar kunokuphuculwa ngokufanelekileyo ukuphepha iintanda ezibangelwa ngamandla angaphandle okanye utshintsho lobushushu.
Elona thamo lifanelekileyo le-HPMC liphakathi kwe-0.3% kunye ne-0.5%, elinokuphucula ukuqina kwesakhiwo sodaka kunye nokunciphisa iintanda ezibangelwa ngumahluko wobushushu kunye nokushwabana. Nangona kunjalo, ukuba idosi iphezulu kakhulu, i-viscosity egqithisileyo inokubangela ukuba udaka lunyange ngokucothayo, oko kuchaphazela ukuxhathisa kwayo kokuqhekeka.
6. Ukuphucula kunye nokusetyenziswa okusebenzayo kwedosi ye-HPMC
Ukususela kuhlalutyo lwezikhombisi zokusebenza ezingentla, umthamo weHPMCkunempembelelo enkulu ekusebenzeni kwe-gypsum mortar. Nangona kunjalo, uluhlu oluchanekileyo lwedosi yinkqubo yokulinganisa, kwaye idosi idla ngokucetyiswa ukuba ibe yi-0.2% ukuya kwi-0.6%. Iimeko ezahlukeneyo zokwakha kunye neemfuno zokusetyenziswa zinokufuna uhlengahlengiso kwidosi ukufezekisa ukusebenza kakuhle. Kwizicelo eziphathekayo, ukongeza kwidosi ye-HPMC, ezinye izinto kufuneka ziqwalaselwe, ezifana nomlinganiselo wodaka, iipropati ze-substrate, kunye neemeko zokwakha.
Umthamo we-HPMC unempembelelo ebalulekileyo ekusebenzeni kwe-gypsum mortar. Isixa esifanelekileyo se-HPMC sinokuphucula ngokufanelekileyo iimpawu eziphambili zodaka ezifana nokugcinwa kwamanzi, amandla okudibanisa, ukukhupha, kunye nokumelana nokuqhekeka. Ulawulo lwedosi kufuneka luqwalasele ngokubanzi iimfuno zokusebenza kokwakhiwa kunye namandla okugqibela odaka. Idosi ye-HPMC engqiqweni ayinakuphucula kuphela ukusebenza kokwakhiwa kodaka, kodwa iphucula ukusebenza kwexesha elide lodaka. Ke ngoko, kwimveliso yokwenyani kunye nokwakhiwa, idosi ye-HPMC kufuneka iphuculwe ngokweemfuno ezithile ukufezekisa isiphumo esihle.
Ixesha lokuposa: Dec-16-2024