I-Hydroxypropyl Methyl Cellulose (HPMC)iyi-ether ye-cellulose evame ukusetshenziswa emanzini encibilika, esetshenziswa kabanzi ezintweni zokwakha, ezimbozweni, emithini nasekudleni. Ezintweni zokwakha ezisekelwe kusimende, i-HPMC, njenge-modifier, ivame ukungezwa kusimende ukuze ithuthukise ukusebenza kwayo, ikakhulukazi enkambisweni yokwakha nokusetshenziswa kwayo. Inomthelela omkhulu ekugelezeni, ukugcinwa kwamanzi, ukusebenza kahle kanye nokumelana nokuqhekeka kwesimende.

 

1. Umphumela we-HPMC ekugelezeni kodaka lukasimende
Ukugeleza kodaka lukasimende kuyisibonakaliso esibalulekile sokulinganisa ukusebenza kwalo ekwakheni, okuthinta ngqo ukusebenza kahle kokwakha kanye nekhwalithi. Njengento ye-polymer, i-HPMC inokuncibilika kwamanzi okuhle kanye nomsebenzi womphezulu. Ngemva kokufakwa kudaka lukasimende, ingakha ifilimu elincane ngokusebenzisana kwamangqamuzana, yandise i-viscosity yodaka, ngaleyo ndlela ithuthukise ukugeleza nokusebenza kodaka. Ngokukhethekile, i-HPMC ingalungisa ngempumelelo ukuhambisana kodaka, kwenze kube lula ukufaka nokusabalalisa ngokulinganayo ngesikhathi senqubo yokwakha, igweme ubunzima bokwakha obubangelwa ukoma ngokweqile kodaka.

I-HPMC ingandisa isikhathi sokusebenza kwe-mortar, okungukuthi, yandise isikhathi sokusetshenziswa kwe-mortar ngesikhathi sokwakha, futhi igweme umphumela wokwakha othinteka ukuhwamuka kwamanzi ngokushesha kakhulu, ikakhulukazi ezindaweni ezinokushisa okuphezulu nendawo eyomile.

 

2. Umphumela we-HPMC ekugcinweni kwamanzi kwesimende sikasimende
Ukugcinwa kwamanzi kwesimende sikasimende kubalulekile ekuqineni nasekuthuthukisweni kwaso. Njengoba inqubo yokumanzisa isimende idinga amanzi anele, uma ukulahlekelwa amanzi kwesimende kushesha kakhulu futhi ukumanzisa kwesimende kungaphelele, kuzothinta ngqo amandla okugcina nokuqina kwesimende. I-HPMC ingathuthukisa ngempumelelo ukugcinwa kwamanzi kwesimende. Amaqembu e-hydroxypropyl kanye ne-methyl aqukethwe esakhiweni sawo sama-molecule anomoya ophilizayo onamandla, ongakha ungqimba olufanayo lokugcinwa kwamanzi esimendeni futhi unciphise izinga lokuhwamuka kwamanzi.

Ikakhulukazi ezindaweni ezinokushisa okuphezulu kanye nomswakama ophansi, ukungezwa kwe-HPMC kungalibazisa kakhulu inqubo yokomisa i-simende, kuqinisekiswe ukumuncwa okuphelele kwe-simende, ngaleyo ndlela kuthuthukise amandla okugcina kanye nokumelana nokuqhekeka kwe-simende. Izifundo zikhombisile ukuthi amandla okucindezela kanye nokuqina kwe-simende enenani elifanele le-HPMC engeziwe ngokuvamile kungcono kunalezo ezingenayo i-HPMC enqubweni yokuqina kwesikhathi eside.

 

3. Umphumela we-HPMC ekumelaneni nokuqhekeka kodaka lukasimende
Imifantu iyinkinga evamile ethinta ikhwalithi yesimende, ikakhulukazi ngaphansi kwethonya lezinto ezifana nokuncipha kokomisa, izinguquko zokushisa, kanye namandla angaphandle, isimende sivame ukuqhekeka. Ukwengezwa kwe-HPMC kungathuthukisa ngempumelelo ukumelana nemifantu yesimende, ikakhulukazi ngezici ezilandelayo:

Thuthukisa ukuqina nokuqina kodaka: I-HPMC inokuqina nokuqina okuthile, okunganciphisa ukucindezeleka okubangelwa ukomisa ukuncipha ngesikhathi senqubo yokulungisa udaka, ngaleyo ndlela kuncishiswe ukwanda kwemifantu.
Khulisa ukunamathelana kanye namandla okunamathelana kodaka: I-HPMC ingathuthukisa ukunamathelana kanye namandla okunamathelana kodaka, ikakhulukazi lapho ubuso be-substrate bungalingani noma ukunamathelana kwe-substrate kukubi.
Lawula izinga lokumunca usimende: Ngokulawula izinga lokumunca usimende, i-HPMC ingalibazisa ukulahleka kwamanzi ngokweqile kusimende sikasimende futhi inciphise ukucindezeleka kokuncibilika okubangelwa ukuhwamuka kwamanzi ngokushesha, ngaleyo ndlela ivimbele ngempumelelo ukwenzeka kwemifantu.

 

4. Umphumela we-HPMC emandleni nasekuqineni kodaka lukasimende
Nakuba ithuthukisa ukusebenza kahle kanye nokumelana nokuqhekeka kwe-samente mortar, i-HPMC nayo inomthelela othile emandleni ayo nasekuqineni kwayo. Nakuba ukwengezwa kwe-HPMC kuzonciphisa kancane amandla okuqala e-samente ngoba isakhiwo sayo sama-molecule sithatha ingxenye yamanzi adingekayo ukuze kube nokumuncwa kwe-samente, ngokuhamba kwesikhathi, i-HPMC isiza ekumuncweni okuphelele kwe-samente, ngaleyo ndlela ithuthukise amandla okugcina e-samente.

Ngaphezu kwalokho, i-HPMC ingathuthukisa ukumelana kodaka lukasimende nokugeleza kwamanzi, inciphise ukuguguleka kodaka ngamanzi noma amakhemikhali, futhi ithuthukise ukuqina kwalo. Lokhu kwenza udaka olune-HPMC olungeziwe lube nokusebenza kangcono kwesikhathi eside ezindaweni ezimanzi noma ezigqwalisayo, ikakhulukazi ezifanele ukuhlobisa udonga lwangaphandle, ukugandaya phansi kanye nezinye izinkambu.

 

5. Amathemba okusetshenziswa kwe-HPMC ezintweni zokwakha ezisekelwe kusimende
Njengoba isidingo sodaka olusebenza kahle kakhulu embonini yokwakha sikhula, i-HPMC, njengesithako esibalulekile, ibonise amathuba amaningi okusetshenziswa ezintweni zokwakha ezisekelwe kusimende. Ngaphezu kwezicelo zendabuko ezifana nokuplasta odongeni kanye nodaka oluphansi, i-HPMC ingasetshenziswa futhi ekukhiqizweni kodaka oluzilinganisayo, udaka lokulungisa, udaka oluxubene nowomile kanye neminye imikhiqizo ukuze kuthuthukiswe ukusebenza okuphelele kodaka.

Ngokuthuthuka kwezidingo zokwakha ukuvikelwa kwemvelo kanye nokusimama, ukungcola okuphansi kanye nezici ze-VOC (i-volatile organic compound) eziphansi ze-HPMC nazo zenza kube nethuba elikhulu lokusetshenziswa ezintweni zokwakha eziluhlaza. Ngesikhathi esifanayo, ngokuthuthukiswa okuqhubekayo kobuchwepheshe obuhlobene, ukuguqulwa kanye namafomu okusetshenziswa kwe-HPMC kuzohlukahluka kakhulu, kuhlinzeke ngamathuba engeziwe okusungula izinto ezintsha kanye nokuthuthukiswa kwezinto zokwakha ezisekelwe kusimende.

 

Njengomuguquli obalulekile we-cement mortar, i-hydroxypropyl methylcellulose (HPMC) ithuthukisa kakhulu ukusebenza kokwakhiwa kanye nokusebenza kokusetshenziswa kwezinto zokwakha ezisekelwe kusimende ngokuthuthukisa ukugeleza, ukugcinwa kwamanzi, ukumelana nokuqhekeka kanye namandla e-mortar. Ngokuthuthuka okuqhubekayo kwezidingo zezinto zokwakha, ububanzi bokusetshenziswa kwe-HPMC buzokwandiswa kakhulu, bube ngesinye sezici ezibalulekile ekukhuthazeni ukuthuthukiswa kwezinto zokwakha zesimanje.