IHydroxypropyl Methyl Cellulose (HPMC)iyi-ether ye-cellulose encibilikayo evame ukusetshenziswa emanzini, esetshenziswa kakhulu ezintweni zokwakha, okokugqoka, imithi kanye nokudla. Ezintweni zokwakha ezisekelwe kusimende, i-HPMC, njengesilungisi, ivame ukungezwa odakeni lukasimende ukuze kuthuthukiswe ukusebenza kwayo, ikakhulukazi ohlelweni lokwakha nokusetshenziswa. Inomthelela obalulekile ekubambiseni kwamanzi, ekugcinweni kwamanzi, ekusebenzeni nasekuqineni kokuqhekeka kodaka.

 

1. Umthelela we-HPMC ekuncipheni kodaka lukasimende
I-fluidity yodaka lukasimende iyinkomba ebalulekile yokulinganisa ukusebenza kwayo kokwakhiwa, okuthinta ngokuqondile ukusebenza kahle kwesakhiwo kanye nekhwalithi. Njengento ye-polymer, i-HPMC inokuncibilika okuhle kwamanzi kanye nomsebenzi ongaphezulu. Ngemva kokwengezwa odakeni lukasimende, lingenza ifilimu elincanyana ngokusebenzisana kwe-intermolecular, likhulise i-viscosity yodaka, futhi ngaleyo ndlela lithuthukise uketshezi nokusebenza kodaka. Ngokucacile, i-HPMC ingakwazi ukulungisa kahle ukuhambisana kodaka, ikwenze kube lula ukusebenzisa nokusabalalisa ngokulinganayo phakathi nenqubo yokwakha, igweme ubunzima bokwakha obubangelwa ukomiswa ngokweqile kodaka.

I-HPMC ingase futhi inwebe isikhathi esivulekile sodaka, okungukuthi, yandise isikhathi sokusebenzisa udaka ngesikhathi sokwakhiwa, futhi igweme umphumela wokwakha othintwa ukuhwamuka kwamanzi ngokushesha okukhulu, ikakhulukazi lapho izinga lokushisa eliphezulu kanye nendawo eyomile.

 

2. Umthelela we-HPMC ekugcineni amanzi odaka lukasimende
Ukugcinwa kwamanzi kodaka lukasimende kubalulekile ekuqiniseni nasekuthuthukisweni kwawo amandla. Njengoba inqubo ye-cement hydration idinga amanzi anele, uma ukulahlekelwa kwamanzi odaka kushesha kakhulu futhi i-samente hydration ingaphelele, izothinta ngokuqondile amandla okugcina nokuqina kodaka. I-HPMC ingathuthukisa ngempumelelo ukugcinwa kwamanzi kodaka. Amaqembu e-hydroxypropyl kanye ne-methyl aqukethwe esakhiweni sawo samangqamuzana ane-hydrophilicity eqinile, engakha ungqimba olufanayo lokugcinwa kwamanzi odakeni futhi kunciphise izinga lokuhwamuka kwamanzi.

Ikakhulukazi ekushiseni okuphezulu nasezindaweni ezinomswakama ophansi, ukungezwa kwe-HPMC kungabambezela kakhulu inqubo yokomisa udaka lukasimende, kuqinisekise ukugcwala okugcwele kukasimende, futhi ngaleyo ndlela kuthuthukise amandla okugcina nokumelana nokuqhekeka kodaka. Ucwaningo luye lwabonisa ukuthi amandla acindezelayo nokuqina kodaka ngenani elifanele le-HPMC engeziwe ngokuvamile angcono kunalawo angenayo i-HPMC enqubweni yokuqina yesikhathi eside.

 

3. Umthelela we-HPMC ekuqineni kokuqhekeka kodaka lukasimende
Imifantu iyinkinga evamile ethinta ikhwalithi yodaka lukasimende, ikakhulukazi ngaphansi kwethonya lezici ezifana nokunciphisa ukuncipha, ukuguquka kwezinga lokushisa, namandla angaphandle, udaka luvame ukuqhekeka. Ukwengezwa kwe-HPMC kungathuthukisa ngempumelelo ukumelana nokuqhekeka kodaka, ikakhulukazi ngalezi zici ezilandelayo:

Thuthukisa i-elasticity kanye ne-plasticity of mortar: I-HPMC inokunwebeka okuthile kanye ne-plasticity, engakhulula ukucindezeleka okubangelwa ukomisa ukuncipha ngesikhathi senqubo yokuphulukisa udaka, ngaleyo ndlela kuncishiswe izigameko zokuqhekeka.
Khulisa ukunamathela namandla okuqina odaka: I-HPMC ingathuthukisa ukunamathela namandla odaka oluqinile, ikakhulukazi lapho i-substrate surface ingalingani noma ukunamathela kwe-substrate kukubi.
Lawula izinga le-hydration kasimende: Ngokulawula izinga lokugeleza kukasimende, i-HPMC ingabambezela ukulahlekelwa ngokweqile kwamanzi odakeni lukasimende futhi inciphise ukucindezeleka kokuncipha okubangelwa ukuhwamuka okusheshayo kwamanzi, ngaleyo ndlela kuvimbele ngempumelelo ukwenzeka kwemifantu.

 

4. Umthelela we-HPMC emandleni nokuqina kodaka lukasimende
Ngenkathi ithuthukisa ukusebenza kahle nokumelana nokuqhekeka kodaka lukasimende, i-HPMC futhi inomphumela othile emandleni ayo kanye nokuqina. Nakuba ukungezwa kwe-HPMC kuzonciphisa kancane amandla okuqala odaka ngenxa yokuthi isakhiwo sawo samangqamuzana sithatha ingxenye yamanzi adingekayo ukuze kufakwe usimende, ngokuhamba kwesikhathi, i-HPMC isiza ukugeleza okuphelele kukasimende, ngaleyo ndlela kuthuthukise amandla okugcina odaka.

Ukwengeza, i-HPMC ingathuthukisa ukumelana nokuqina kosimende, inciphise ukuguguleka kodaka ngamanzi noma ngamakhemikhali, futhi ithuthukise ukuqina kwayo. Lokhu kwenza udaka olune-HPMC engeziwe lube nokusebenza okungcono kwesikhathi eside ezindaweni ezimanzi noma ezigqwalile, ikakhulukazi ezilungele ukuhlobisa udonga lwangaphandle, ukugandaywa phansi nezinye izinkambu.

 

5. Amathemba okufaka isicelo se-HPMC ezintweni zokwakha ezisekelwe kusimende
Ngokukhula kwesidingo sodaka olusebenza kahle kakhulu embonini yezokwakha, i-HPMC, njengesithasiselo esibalulekile, ikhombise amathemba abanzi okusebenza ezintweni zokwakha ezisekelwe usimende. Ngaphezu kwezinhlelo zokusebenza zendabuko ezifana nokuplastelwa odongeni kanye nodaka lwaphansi, i-HPMC ingasetshenziswa futhi ekukhiqizeni udaka oluzilinganisa, udaka lokulungisa, udaka oluxutshwe okomile neminye imikhiqizo ukuze kuthuthukiswe ukusebenza okuphelele kodaka.

Ngokuthuthukiswa kwezidingo zokwakha ukuvikelwa kwemvelo kanye nokusimama, ukungcola okuphansi kanye nezici eziphansi ze-VOC (i-volatile organic compound) ye-HPMC nayo iyenza ibe namandla amakhulu okusetshenziswa ezintweni zokwakha eziluhlaza. Ngesikhathi esifanayo, ngokuthuthukiswa okuqhubekayo kobuchwepheshe obuhlobene, ukuguqulwa kanye namafomu okufaka isicelo e-HPMC azohlukahluka kakhulu, okuhlinzeka ngamathuba amaningi okuqamba kanye nokuthuthukiswa kwezinto zokwakha ezisekelwe kusimende.

 

Njengesiguquli esibalulekile sikasimende, i-hydroxypropyl methylcellulose (HPMC) ithuthukisa kakhulu ukusebenza kokwakha nokusebenzisa izinto zokwakha ezisekelwe kusimende ngokuthuthukisa uketshezi, ukugcinwa kwamanzi, ukumelana nokuqhekeka kanye namandla odaka. Ngokuthuthukiswa okuqhubekayo kwezidingo zempahla yokwakha, ububanzi bokufaka isicelo be-HPMC buzophinde bunwetshwe, bube ngenye yezinto ezibalulekile ekukhuthazeni ukuthuthukiswa kwezinto zokwakha zesimanje.