I-HPMC (Hydroxypropyl Methylcellulose) isongezelelo esisetyenziswa ngokuqhelekileyo ekwakheni i-plaster, ngakumbi ekuphuculeni ukumelana kwamanzi, iimpawu ze-rheological kunye nokusebenza kokwakhiwa kwe-plaster.
1. Ukuphucula ukugcinwa kwamanzi kwi-plaster
I-HPMC yikhompawundi yepolymer enyibilikayo emanzini enokuthi yenze isakhiwo sothungelwano kwisamente okanye isamente esekwe kwigypsum. Esi sakhiwo sinceda ukugcina amanzi kunye nokuthintela i-samente okanye i-gypsum ekulahlekelweni kwamanzi ngokukhawuleza ngexesha lenkqubo yokuqina, ngaloo ndlela igwema ukuqhekeka okanye ukunciphisa ukuxhathisa kwamanzi. Ngokongeza isixa esifanelekileyo se-HPMC kudaka, inkqubo yokufakwa kwamanzi kwisamente inokulibaziseka, okwenza udaka lube namandla angcono okugcina amanzi. I-hydrate eyenziwe ngesamente ngexesha lenkqubo ye-hydration idinga amanzi aneleyo ukukhuthaza ukusabela. Ukulibazisa ukulahleka kwamanzi kunokuphucula ukuxinana kunye nokukwazi ukuchasana nokungena kwemathiriyeli yokugqibela.
2. Ukuphucula ukunamathela kunye nokuxinana kwe-plaster
Njengesongezo sepolymer, i-HPMC ayinako ukunyusa kuphela iimpawu ze-rheological zodaka, kodwa nokuphucula ukunamathela kwayo. Xa i-HPMC yongezwa, ukuqina kokubambisana kwe-plaster kuphuculwe, oku kunceda ukwenza ukunamathela okunamandla kwi-substrate (njengezitena, ikhonkrithi okanye udonga lwegypsum). Ngelo xesha, i-HPMC yenza i-plaster ifake isakhiwo se-denser ngexesha lenkqubo yokuqina, ukunciphisa ubukho be-capillary pores. Iipores ezimbalwa zithetha ukuba kunzima ngakumbi ukuba amanzi angene, ngaloo ndlela ephucula ukuxhathisa kwamanzi kwi-plaster.
3. Ukomelezwa kokumelana nokungena
Ulwakhiwo lwemolekyuli ye-HPMC inokwenza into efana ne-colloid kwi-plaster, evumela udaka yenze i-microstructure efanayo ngexesha lenkqubo yokunyanga. Njengoko isakhiwo siphucula, i-plaster surface iba lula kwaye iyancipha, kwaye ukunyanzeliswa kwamanzi kuyancipha. Ngoko ke, ukuchasana kwamanzi kwe-plaster kuphuculwe, ngokukodwa kwiindawo ezinomswakama okanye ezinobuncwane bamanzi, ukongezwa kwe-HPMC kunokuthintela ngokufanelekileyo umswakama ukuba ungangeni eludongeni ngokusebenzisa i-plaster layer.
4. Ukuphuculwa kokuqina kunye nokungangeni kwamanzi
Ukuchasana kwamanzi akuxhomekanga kuphela kwikhono lokungangeni manzi kwendawo yezinto eziphathekayo, kodwa kwakhona kuhambelana ngokusondeleyo nesakhiwo sangaphakathi sodaka. Ngokongeza i-HPMC, ukuzinza komzimba kunye neekhemikhali zodaka kunokuphuculwa. I-HPMC iphucula ukunganyangeki kwemichiza yodaka kwaye inqanda ukubola kwesamente okubangelwa kukungena kwamanzi. Ngokukodwa kwiindawo zokucwiliswa kwamanzi ixesha elide okanye kwiindawo ezifumileyo, i-HPMC inceda ukwandisa ubomi benkonzo yodaka kunye nokuphucula iimpawu zayo zokulwa nokuguga.
5. Lungisa i-viscosity kunye nokusebenza
HPMC Kananjalo unomsebenzi wokulungelelanisa i-viscosity kunye neempawu ze-rheological. Kulwakhiwo lwangempela, i-viscosity efanelekileyo inokwenza ukuba i-plaster ingabi lula ukuhamba xa isetyenzisiwe, kwaye inokugqunywa ngokulinganayo eludongeni ngaphandle kokubangela ukuba i-plaster ziwe ngexesha lokwakhiwa ngenxa yokufuma okugqithisileyo. Ngokulawula ukusebenza kwe-plaster, abasebenzi bokwakha banokulawula kangcono ukufana kwe-plaster, ngaloo ndlela baphucula ngokungathanga ngqo ukusebenza kwamanzi kwi-plaster.
6. Yandisa ukuxhathisa kokuqhekeka
Ngethuba lenkqubo yokwakha, i-plaster iyancipha ngenxa yezinto zangaphandle ezifana nokutshintsha kweqondo lokushisa kunye nokuguquka komswakama, okubangelwa ukuqhekeka. Ubukho bokuqhekeka akuchaphazeli nje ukubonakala kwe-plaster, kodwa kunika umjelo wokungena kwamanzi. Ukongezwa kwe-HPMC kunokunyusa ukuqina kwe-plaster, okwenza kube nokumelana nokuqhekeka okuqinileyo ngexesha lenkqubo yokomisa, ngaloo ndlela kuthintele ukufuma ukungena ngaphakathi ngaphakathi ngeentanda kunye nokunciphisa umngcipheko wokungena kwamanzi.
7. Ukuphucula ukuguquguquka kunye nolwakhiwo olulula
Ukongezwa kwe-HPMC kunokwenza udaka luziqhelanise ngakumbi phantsi kweemeko zemozulu ezahlukeneyo. Kwindawo yobushushu obuphezulu, umswakama we-plaster uphuphuma ngokukhawuleza kwaye ulungele ukuqhekeka. Ubukho be-HPMC bunceda udaka lugcina amanzi kwindawo eyomileyo, ukuze isantya sokunyanga silawuleke kwaye iintanda kunye nomonakalo ongangeni manzi obangelwa kukomisa ngokukhawuleza kuyaphetshwa. Ukongeza, i-HPMC inokuphucula ukunamathela kwi-plaster, ukwenzela ukuba ikwazi ukugcina ukunamathela kakuhle kwiindawo ezahlukeneyo zesiseko kwaye akukho lula ukuwa.
I-HPMC idlala indima ebalulekileyo ekuphuculeni ukuxhathisa kwamanzi kudaka, ikakhulu ngale miba ilandelayo:
Ukugcinwa kwamanzi: kulibazisa ukufakwa kwesamente, gcina ukufuma, kwaye uthintele ukomisa ngokukhawuleza.
Ukubambelela kunye nobuninzi: phucula ukudibanisa kwe-plaster kwisiseko sesiseko kwaye wenze isakhiwo esixineneyo.
Ukumelana nokunyanzeliswa: ukunciphisa iipores kunye nokuthintela ukungena kwamanzi.
Ukuqina kunye nokungangeni kwamanzi: ukuphucula iikhemikhali kunye nokuzinza komzimba wezinto eziphathekayo kunye nokwandisa ubomi benkonzo.
Ukumelana nokuqhekeka: ukwandisa ukuqina kwe-plaster kunye nokunciphisa ukubunjwa kweentanda.
Ukulungelelaniswa kolwakhiwo: Ukuphucula iimpawu ze-rheological ze-plaster kunye nokuphucula ukusebenza ngexesha lokwakha. Ngoko ke, i-HPMC ayilona nje isongezo sokuphucula ukusebenza kokwakhiwa kodaka, kodwa iphucula ukuxhathisa kwamanzi kwi-plaster ngokusebenzisa iindlela ezininzi, ukwenzela ukuba udaka lukwazi ukugcina uzinzo oluhle kunye nokuqina kwexesha elide kwiindawo ezahlukeneyo ezinzima.
Ixesha lokuposa: Nov-20-2024