IHydroxypropyl methylcellulose (HPMC) iyi-ether ye-cellulose esebenza ngezindlela eziningi esetshenziswa kakhulu embonini yezokwakha, ikakhulukazi ekwenziweni kodaka oluxubene nelomile. Izakhiwo zayo eziyingqayizivele zithuthukisa ukusebenza nokuphathwa kodaka, okunomthelela omkhulu ekusebenzeni kwazo.
Isakhiwo Samakhemikhali Nokuhlanganiswa
I-HPMC isuselwa ku-cellulose, i-polymer yemvelo etholakala ezindongeni zamaseli ezitshalo. Ihlanganiswa nge-etherification ye-cellulose nge-methyl chloride ne-propylene oxide. Le nqubo ithatha indawo yamanye amaqembu e-hydroxyl ku-molecule ye-cellulose ngamaqembu e-methoxy (-OCH₃) kanye ne-hydroxypropyl (-OCH₂CH(OH)CH₃). Izinga lokushintsha kanye nesilinganiso se-methoxy kumaqembu e-hydroxypropyl inquma izici ezithile ze-HPMC, njengokuncibilika, i-viscosity, kanye ne-thermal gelation.
Izakhiwo ze-HPMC ku-Dry-Mix Mortar
1. Ukugcina Amanzi
I-HPMC iphumelela kakhulu ekugcineni amanzi ngaphakathi kwengxube yodaka. Lesi sakhiwo sokugcina amanzi sibalulekile ngoba siqinisekisa ukugeleza okufanele kukasimende, kuthuthukise inqubo yokwelapha. Ukugcinwa kwamanzi okuthuthukisiwe kuholela ekusebenzeni okungcono kanye nesikhathi eside sokuvula, kunciphisa ingozi yokomisa ngaphambi kwesikhathi, okungabangela ukuncipha nokuqhekeka. Ngaphezu kwalokho, iqinisekisa ukunikezwa kwamanzi okungaguquki kwe-cement hydration, ukuthuthukisa izakhiwo zemishini namandla odaka.
2. Ukuguqulwa Kwe-Rheology
I-HPMC iguqula ngokuphawulekayo i-rheology yodaka lwengxube eyomile. Isebenza njenge-thickener, ikhulisa i-viscosity yengxube yodaka. Lesi sakhiwo sibalulekile ekulawuleni ukugeleza nokusabalala kodaka, okwenza kube lula ukusebenzisa endaweni eqondile ngaphandle kokuhlehla. Kuyasiza futhi ekuzuzeni izendlalelo ezibushelelezi nezifanayo ngesikhathi sokufaka isicelo, ukuqinisekisa ukunamathela nokubumbana okungcono. Ukuguqulwa kwe-Rheological yi-HPMC kuthuthukisa ukuphatha kanye nezici zokusetshenziswa kodaka.
3. Ukuthuthukiswa Kokunamathela
I-HPMC ithuthukisa izici zokunamathisela zodaka lwengxube eyomile. Ithuthukisa amandla esibopho phakathi kodaka nama-substrates ahlukahlukene njengezitini, ukhonkolo, namathayela. Lokhu kubaluleke kakhulu ekusetshenzisweni okufana nokunamathiswa kwamathayela kanye nezinhlelo zokuvikela ukushisa zangaphandle. Ukunamathela okuthuthukisiwe kunciphisa amathuba okuba ne-delamination futhi kuqinisekise ukuqina kwesikhathi eside kodaka olusetshenzisiwe.
4. Ukusebenza nokungaguquguquki
Enye yezinzuzo eziyinhloko ze-HPMC ukuthuthukiswa kokusebenza nokungaguquguquki kodaka lwengxube eyomile. Ivumela ukuxuba okulula nokusebenzisa okubushelelezi, inikeze ukuthungwa okukhilimu okulula ukusakazeka nokuma. Ukusebenza okuthuthukisiwe kunciphisa umzamo odingekayo ngesikhathi sokufaka isicelo, okwenza inqubo isebenze kahle futhi ingadingi abasebenzi abaningi. Iphinde iqinisekise ukusatshalaliswa okufanayo kodaka, okuholela ekuqedweni kwekhwalithi engcono.
5. I-Gelation eshisayo
I-HPMC ikhombisa izakhiwo ze-gelation ezishisayo, okusho ukuthi yakha ijeli lapho ishiswa. Lesi sakhiwo sinenzuzo ezinhlelweni lapho kudingeka ukumelana nokushisa. Ngesikhathi sokusetshenziswa kodaka, ukushisa okukhiqizwa kungabangela ukwanda kwesikhashana kwe-viscosity, okusiza ekugcineni ukuma nokuzinza kodaka olusetshenzisiwe. Lapho izinga lokushisa lehla, ijeli ibuyela esimweni sayo sokuqala, okuvumela ukuqhubeka nokusebenza.
6. Ukungena emoyeni
I-HPMC ingethula futhi izinze amabhamuza omoya amancane ngaphakathi kwengxube yodaka. Lokhu kufakwa komoya kuthuthukisa ukumelana nokuncibilika kodaka ngokunikeza indawo yamakristalu eqhwa ukuze ande, kunciphise ukucindezela kwangaphakathi nokuvimbela umonakalo. Ukwengeza, umoya ofakiwe uthuthukisa ukusebenza kanye nokudonsa kodaka, okwenza kube lula ukusebenzisa ezimweni ezihlukahlukene.
7. Ukuhambisana Nezinye Izithasiselo
I-HPMC isebenzisana nohlu olubanzi lwezinye izithasiselo ezivame ukusetshenziswa odakeni lwengxube eyomile, njengama-superplasticizer, ama-retarders, nama-accelerator. Lokhu kuhambisana kuvumela ukwakhiwa kwezingxube zodaka ezenzelwe ukufeza izidingo ezithile zokusebenza. Isibonelo, i-HPMC ingasebenza ngokubambisana nama-superplasticizers ukuthuthukisa ukugeleza ngenkathi igcina i-viscosity oyifunayo.
8. Ukwakhiwa Kwefilimu
I-HPMC yakha ifilimu elincanyana, eliguquguqukayo lapho lomiswa, elinikela kuzakhiwo ezingaphezulu zodaka. Lokhu kwakheka kwefilimu kusiza ekulawuleni ukuhwamuka kwamanzi futhi kuthuthukisa amandla angaphezulu nokuqina kodaka. Iphinde inikeze isendlalelo esivikelayo esingathuthukisa ukumelana nesimo sezulu kanye nokumelana nokuhuzuka kodaka olusetshenzisiwe.
9. Ukumelana Nemvelo
I-HPMC inika ukumelana nezinto ezihlukahlukene zemvelo, okuhlanganisa umswakama, ukushintshashintsha kwezinga lokushisa, nokuchayeka kwamakhemikhali. Lokhu kumelana kubalulekile ekuqineni nasekuphileni isikhathi eside kodaka lwengxube eyomile, ikakhulukazi ezimweni ezinzima noma eziguquguqukayo zemvelo. Kuyasiza ekugcineni ukusebenza kanye nokubukeka kwesikhathi esengeziwe sodaka, kunciphisa isidingo sokugcinwa njalo noma ukulungiswa.
10. Umthamo kanye Nesicelo
Umthamo we-HPMC odakeni lwengxube eyomile ngokuvamile usukela ku-0.1% ukuya ku-0.5% ngesisindo sengxube eyomile. Umthamo othize uncike ezicini ezifunwayo kanye nohlobo lohlelo. Isibonelo, imithamo ephezulu ingasetshenziswa kuzinto zokunamathisela amathayela ukuze kuthuthukiswe ukunamathela nokusebenza, kuyilapho imithamo ephansi ingase yanele odakeni lwenjongo evamile. Ukufakwa kwe-HPMC kungxube eyomile kuqondile, futhi kungahlakazeka kalula phakathi nenqubo yokuhlanganisa.
I-HPMC iyingxenye ebaluleke kakhulu odakeni lwengxube eyomile ngenxa yezakhiwo zayo ezisebenzayo. Ikhono layo lokugcina amanzi, ukuguqula i-rheology, ukuthuthukisa ukunamathela, ukuthuthukisa ukusebenza kahle, nokuhlinzeka ukumelana nemvelo kuyenza ibe isithasiselo esibalulekile ezinhlelweni ezihlukahlukene zokwakha. Ngokuqonda nokusebenzisa izakhiwo eziyisisekelo ze-HPMC, abakhi befomula bangakha amamorikhi wengxube eyomile asebenza kahle ahlangabezana nezidingo ezahlukahlukene zezinqubo zokwakha zesimanje.
Isikhathi sokuthumela: Jun-14-2024