I-Hydroxypropyl methyl cellulose (HPMC)Ingabe i-ether ye-cellulose evame ukusetshenziswa kwamanzi esetshenziswayo, esetshenziswa kabanzi kwezinto zokwakha, ukugqoka, imithi nokudla. Ezintweni zokwakha ezenzelwe ngokobisi, i-HPMC, njenge-modifier, imvamisa ingezwe ku-pollar usimende ukuze uthuthukise ukusebenza kwayo, ikakhulukazi kwinqubo yokwakha nokusetshenziswa. Inomthelela omkhulu olwela uketshezi, ukugcinwa kwamanzi, okusebenzayo kanye nokumelana nokuqhekeka kodaka.

 

1. Umphumela we-HPMC olwela uketshezi lukasimende
U-fluidity of usimende kasimende uyinkomba ebalulekile yokukala ukusebenza kwayo kokwakha, okuthinta ngqo ukusebenza kwezokwakha nekhwalithi. Njenge-polymer material, i-HPMC ine-solubility enhle yamanzi kanye nomsebenzi ongaphezulu. Ngemuva kokungezwa ngodaka kasimende, kungakha ifilimu elincanyana ngokusebenzisana phakathi kwama-intermolecular, kwandise ukubonwa kodaka, futhi ngaleyo ndlela kuthuthukise uketshezi nokusebenza kodaka. Ngokukhethekile, i-HPMC ingalungisa ngempumelelo ukuvumelana kodaka, okwenza kube lula ukusebenzisa futhi ngokulinganayo ukusabalalisa ngesikhathi sokwakha, ukugwema ubunzima bokwakha obangelwa ukomiswa ngodaka kodaka.

I-HPMC ingaphinde futhi yandise isikhathi esivulekile sodaka, okungukuthi, yandise isikhathi sokusetshenziswa kodaka ngesikhathi sokwakha, futhi igweme umphumela wokwakha othintwe ukuhwamuka okusheshayo kwamanzi, ikakhulukazi ekushiseni okuphezulu nendawo eyomile.

 

2. Umphumela we-HPMC ekugcinweni kwamanzi kosimende kasimende
Ukugcinwa kwamanzi kosimende kasimende kubalulekile ekuthuthukisweni kwayo okuqinisayo nokuqina. Njengoba inqubo ye-hyment hydration idinga amanzi anele, uma ukulahleka kwamanzi ngodaka kushesha kakhulu futhi i-cydy hydration ayiphelele, izothinta ngqo amandla okugcina nokuqina kodaka. I-HPMC ingathuthukisa ngempumelelo ukugcinwa kwamanzi ngodaka ngodaka. Amaqembu we-hydroxypropyl kanye ne-methyl equkethe esakhiweni sawo se-molecular ane-hydrophility eqinile, engakha umfaniswano wokugcina amanzi odongeni futhi anciphise izinga lokuhwamuka kwamanzi.

Ikakhulu ekushiseni okuphezulu nendawo yomswakama ophansi, ukungezwa kwe-HPMC kungabambezela kakhulu inqubo yokomisa kasimende, kuqinisekiswe i-hydration egcwele kasimende, futhi ngaleyo ndlela ithuthukise amandla okugcina kanye nokuvimba kodaka. Ucwaningo luye lwabonisa ukuthi amandla acindezelayo nokuqina kodaka olunenani elifanelekile le-HPMC elingeziwe ngokuvamile lingcono kunalawo ngaphandle kwe-HPMC inqubo enzima yesikhathi eside.

 

I-3. Umphumela we-HPMC ekumelaneni nokuqhekeka kosimende kasimende
Imifantu iyinkinga evamile ethinta ikhwalithi kasimende kasimende, ikakhulukazi ngaphansi kwethonya lezici ezinjengokuchofoza i-shrinkage, izinguquko zokushisa, kanye namabutho angaphandle, udaka luthambekele ekuqhekekeni. Ukungezwa kwe-HPMC kungathuthukisa ngempumelelo ukumelana nokuqhekeka kodaka, ikakhulukazi ngokusebenzisa izici ezilandelayo:

Thuthukisa ukuqina nobubanzi beplastiki yodaka
Khulisa ukunamathela kanye namandla ashubile oDitar: I-HPMC ingathuthukisa ukunamathela kanye namandla ashubile odaka, ikakhulukazi lapho indawo engezansi engalingani noma i-substrate adhesion imbi.
Lawula isilinganiso se-Cement Hydration: Ngokulawula izinga lesikhumba le-hycration, i-HPMC ingabambezela ukulahlekelwa ngokweqile kwamanzi ku-usimende kasimende futhi inciphise ukucindezelwa kwe-shrinkage okubangelwa ukuhwamuka okusheshayo kwamanzi, ngaleyo ndlela kuvimbela ukuvela kwemifantu.

 

I-4. Umphumela we-HPMC emandleni nokuqina kodaka kasimende
Ngenkathi uthuthuka ukusebenziseka nokumelana nokuqhekeka kosimende kasimende, i-HPMC nayo inomthelela othile kumandla ayo nokuqina kwayo. Yize ukwengeza i-HPMC kuzonciphisa kancane amandla okuqala ngodaka ngoba isakhiwo salo samangqamuzana sihlala ingxenye yamanzi adingekayo ku-yment hydration, ngokuhamba kwesikhathi, ngaleyo ndlela kuthuthukise amandla okugcina wodaka.

Ngaphezu kwalokho, i-HPMC ingathuthukisa ukumelana nokuvumela kukakhonkolo kasimende, yehlisa ukuguguleka kodaka ngamanzi noma ngamakhemikhali, futhi athuthukise ukuqina kwawo. Lokhu kwenza udaka nge-HPMC angezelwe kangcono ukusebenza kwesikhathi eside noma ezindaweni ezilimazayo, ikakhulukazi umhlobiso wangaphandle wangaphandle, indawo ephansi yamanye amasimu.

 

5. Amathemba wohlelo lokusebenza lwe-HPMC ezintweni zokwakha ezenzelwe usimende
Ngesidingo esikhulayo sodaka olusezingeni eliphezulu embonini yezokwakha, i-HPMC, njengesengezo esibalulekile, ikhombisa amathuba okusebenza abanzi ezintweni zokwakha ezenzelwe usimende. Ngaphezu kwezinhlelo zokusebenza zendabuko ezinjengodonga oludonga kanye nodaka lwaphansi, i-HPMC ingasetshenziswa nasekukhiqizweni kodaka lokuzimela, ukulungisa udaka, udaka olomile neminye imikhiqizo ukuze uthuthukise ukusebenza okuphelele kodaka.

Ngokwephuculwa kwezidingo zokwakha ukuvikela kwemvelo nokusimama, ukungcoliswa okuphansi kanye ne-Voc ye-Organic Compact) ye-HPMC nakho kungenza kube namandla okusebenza ezintweni zokwakha eziluhlaza. Ngasikhathi sinye, ngokuthuthukiswa okuqhubekayo kobuchwepheshe obuhlobene, ukuguqulwa kanye nezindlela zokufaka ze-HPMC kuzohlukahluka, ukuhlinzeka ngamathuba amaningi okusungula izinto ezintsha nokwenza amasimu wokwakha amasimende.

 

Njenge-modifier ebaluleke kakhulu kasimende, i-hpdroxypropyl methylcellulose (HPMC) ithuthukisa ukusebenza kokwakha futhi isebenzise ukusebenza kwezinto zokwakha ezisuselwa kusika usimende ngokwenza ngcono ukukhiqizwa kwamanzi, ukugcinwa kwamanzi, ukumelana nokuqhekeka namandla odaka. Ngokuthuthuka okuqhubekayo kwezidingo zokwakha zokwakha, ubukhulu besicelo se-HPMC buzokwanda futhi, baba ngomunye wezinto ezibalulekile ekuthuthukiseni ukuthuthukiswa kwezinto zesimanje zokwakha.