Umgomo wokusebenza we-hydroxypropyl methylcellulose odakeni

I-Hydroxypropyl methylcellulose (HPMC)iyinhlanganisela ye-polymer encibilika emanzini esetshenziswa kabanzi embonini yezokwakha, ikakhulukazi odakeni olusekelwe kusimende, udaka olusekelwe ku-gypsum kanye nokunamathela kwamathayili. Njengesengezo sodaka, i-HPMC ingathuthukisa ukusebenza kokwakhiwa, ithuthukise ukusebenza, ukunamathela, ukugcinwa kwamanzi kanye nokumelana nokuqhekeka kodaka, ngaleyo ndlela ithuthukise ikhwalithi yonke yodaka.

1. Izakhiwo eziyisisekelo ze-HPMC

I-HPMC itholakala ngokuyinhloko ngokuguqulwa kwe-etherification ye-cellulose, futhi inokuncibilika okuhle kwamanzi, ukujiya, ukwenza ifilimu, ukuthambisa kanye nokuzinza. Izici zayo ezibalulekile zomzimba zihlanganisa:

Ukunyibilika kwamanzi: Angancibilika emanzini abandayo noma ashisayo ukuze kwakheke isixazululo se-viscous esisobala noma esikhanyayo.
Ukuqina komphumela: Kungakhuphula kakhulu i-viscosity yesixazululo futhi kubonise umphumela omuhle wokujiya ekugxilweni okuphansi.
Ukugcinwa kwamanzi: I-HPMC ingakwazi ukumunca amanzi futhi ikhukhumale, futhi ibambe iqhaza ekugcinweni kwamanzi odaka ukuze kuvinjwe amanzi ukuthi angalahleki ngokushesha kakhulu.
Izakhiwo ze-Rheological: Ine-thixotropy enhle, esiza ukuthuthukisa ukusebenza kokwakhiwa kodaka.

2. Iqhaza eliyinhloko le-HPMC odakeni

Iqhaza le-HPMC odakeni libonakala ikakhulukazi kulezi zici ezilandelayo:

2.1 Ukwenza ngcono ukugcinwa kwamanzi odaka

Ngesikhathi senqubo yokwakhiwa kodaka lukasimende, uma amanzi ehwamuka ngokushesha kakhulu noma emuncwa ngokweqile isisekelo, kuzoholela ekuphenduleni okunganele kwe-cement hydration futhi kuthinte ukuthuthukiswa kwamandla. I-HPMC yakha uhlaka lwe-mesh olufanayo odakeni ngokusebenzisa i-hydrophilicity yayo kanye nokumuncwa kwamanzi kanye nekhono lokunweba, ivala umswakama, inciphisa ukulahlekelwa kwamanzi, ngaleyo ndlela yandise isikhathi esivulekile sodaka futhi ithuthukise ukuguquguquka kwesakhiwo.

2.2 Ukuqina komphumela, ukuthuthukisa ukusebenza kodaka

I-HPMC inomphumela omuhle wokuqina, ongakhuphula i-viscosity yodaka, wenze udaka lube nepulasitiki engcono, futhi luvimbele udaka ekuhlukaniseni, ukuhlukaniswa kanye nokopha kwamanzi. Ngesikhathi esifanayo, ukuqina okufanelekile kungathuthukisa ukwakhiwa kodaka, okwenza kube lula ukusebenzisa kanye nezinga phakathi nenqubo yokwakha, futhi kuthuthukise ukusebenza kahle kokwakhiwa.

2.3 Thuthukisa ukubopha futhi uthuthukise ukunamathela kodaka

Ekusetshenzisweni okufana nokunamathiswa kwamathayili, udaka lwamatshe kanye nodaka lwe-plaster, amandla okubopha odaka abalulekile. I-HPMC yenza ifilimu ye-polymer efanayo phakathi kwesisekelo nesembozo ngokusebenzisa isenzo sokwenza ifilimu, okuthuthukisa amandla okubopha odaka ku-substrate, ngaleyo ndlela kuncishiswe ingozi yokuqhekeka kodaka nokuwa.

2.4 Thuthukisa ukusebenza komsebenzi wokwakha futhi unciphise ukuntengantenga

Ngokwakhiwa kwendawo eqondile (njengokuplasta odongeni noma ukwakhiwa kokunamathela kwamathayela), udaka luvame ukucwila noma ukushelela ngenxa yesisindo salo. I-HPMC ikhulisa ukucindezeleka kwesivuno kanye ne-anti-sag yodaka, ukuze udaka lukwazi ukunamathela kangcono ebusweni besisekelo ngesikhathi sokwakhiwa okuqondile, ngaleyo ndlela kuthuthukise ukuzinza kokwakhiwa.

2.5 Thuthukisa ukumelana nokuqhekeka futhi uthuthukise ukuqina

Udaka luvame ukuqhekeka ngenxa yokuncipha ngesikhathi sokuqina, okuthinta ikhwalithi yephrojekthi. I-HPMC ingalungisa ukucindezeleka kwangaphakathi kodaka futhi yehlise izinga lokuncipha. Ngesikhathi esifanayo, ngokuthuthukisa ukuguquguquka kodaka, kunokumelana nokuqhekeka okungcono ngaphansi kwezinguquko zokushisa noma ukucindezeleka kwangaphandle, ngaleyo ndlela kuthuthukise ukuqina.

2.6 Thinta isikhathi sokumisa udaka

I-HPMC ithinta isikhathi sokusetha sodaka ngokulungisa isivinini sokusabela kwe-cement hydration. Inani elifanele le-HPMC linganweba isikhathi sokwakha udaka futhi liqinisekise isikhathi esanele sokulungisa phakathi nenqubo yokwakha, kodwa ukusetshenziswa ngokweqile kungase kwandise isikhathi sokusetha futhi kuthinte ukuqhubeka kwephrojekthi, ngakho-ke umthamo kufanele ulawulwe ngokunengqondo.

3. Umphumela womthamo we-HPMC ekusebenzeni kodaka

Umthamo we-HPMC odakeni ngokuvamile uphansi, ngokuvamile phakathi kuka-0.1% no-0.5%. Umthamo othize uncike ohlotsheni lodaka kanye nezidingo zokwakha:

Umthamo ophansi (≤0.1%): Ungathuthukisa ukugcinwa kwamanzi futhi uthuthukise kancane ukusebenza kodaka, kodwa umphumela wokujiya awunamandla.

Umthamo omaphakathi (0.1%~0.3%): Uthuthukisa kakhulu ukugcinwa kwamanzi, ukunamathela kanye nekhono lokungancibiliki likadaka futhi kuthuthukisa ukusebenza komsebenzi wokwakha.

Umthamo ophezulu (≥0.3%): Kuzokwandisa kakhulu i-viscosity yodaka, kodwa kungase kuthinte uketshezi, kunwebe isikhathi sokusetha, futhi kungabi kuhle ekwakhiweni.

Njengesengezo esibalulekile sodaka,I-HPMCidlala indima ebalulekile ekuthuthukiseni ukugcinwa kwamanzi, ukuthuthukisa ukusebenza kokwakhiwa, ukuthuthukisa ukunamathela kanye nokumelana nokuqhekeka. Ukwengezwa okuphusile kwe-HPMC kungathuthukisa kakhulu ukusebenza kodaka futhi kuthuthukise ikhwalithi yephrojekthi. Ngesikhathi esifanayo, umthamo udinga ukulawulwa ukuze ugweme imiphumela emibi ekubekeni isikhathi nokwakhiwa kwe-fluidity. Ngokuzayo, ngokuthuthukiswa okuqhubekayo kwemboni yezokwakha, amathuba okufaka isicelo se-HPMC ezintweni zokwakha ezintsha eziluhlaza azoba banzi.