IHydroxypropyl Methylcellulose (HPMC) iyi-polymer encibilika emanzini esetshenziswa kakhulu esetshenziswa kakhulu ezintweni zokwakha, ikakhulukazi izinto zokunamathisela ezisekelwe kusimende. Izakhiwo zamakhemikhali eziyingqayizivele kanye nezakhiwo ezibonakalayo ze-HPMC ziyenza idlale indima ebalulekile ekuthuthukiseni ukunamathela, ukusebenza kokwakha, nokuqina kwezinamathiselo zamathayela.
(1) Ulwazi oluyisisekelo lwe-HPMC
1. Isakhiwo samakhemikhali se-HPMC
I-HPMC iphuma ku-cellulose etholwe ngokushintsha amakhemikhali i-cellulose yemvelo. Isakhiwo sayo sakhiwe ngokuyinhloko ngamaqembu e-methoxy (-OCH₃) kanye ne-hydroxypropoxy (-CH₂CHOHCH₃) athatha indawo yamaqembu athile e-hydroxyl ochungechungeni lwe-cellulose. Lesi sakhiwo sinikeza i-HPMC ikhono elihle lokuncibilika kanye ne-hydration.
2. Izakhiwo zomzimba ze-HPMC
Ukunyibilika: I-HPMC ingancibilika emanzini abandayo ukuze yakhe isixazululo se-colloidal esisobala futhi inekhono elihle lokugeleza kwamanzi kanye nekhono lokujiya.
I-Thermogelation: Isixazululo se-HPMC sizokwakha ijeli lapho sishisisa futhi sibuyele esimweni esiwuketshezi ngemva kokupholisa.
Umsebenzi ongaphezulu: I-HPMC inomsebenzi omuhle ongaphezulu esixazululweni, esiza ukwakha isakhiwo sebhamuza esizinzile.
Lezi zakhiwo eziyingqayizivele zomzimba namakhemikhali zenza i-HPMC ibe into efanelekile yokulungisa izinto ezinamathelayo ezisekelwe kusimende.
(2) Indlela ye-HPMC ethuthukisa ukusebenza kwezinamatheliso zamathayela asuselwa kusimende
1. Thuthukisa ukugcinwa kwamanzi
Isimiso: I-HPMC yakha isakhiwo senethiwekhi ye-viscous esixazululweni, esingakhiya ngempumelelo umswakama. Leli khono lokugcina amanzi libangelwa inani elikhulu lamaqembu e-hydrophilic (njengamaqembu e-hydroxyl) kuma-molecule e-HPMC, akwazi ukumunca futhi agcine inani elikhulu lomswakama.
Thuthukisa ukunamathela: Izinamathiselo zethayela ezisekelwe ku-cement zidinga umswakama ukuze ubambe iqhaza ekuphenduleni kwe-hydration ngesikhathi senqubo yokuqina. I-HPMC igcina ubukhona bomswakama, ivumela usimende ukuthi ugcwale amanzi ngokugcwele, ngaleyo ndlela uthuthukise ukunamathela kokunamathela.
Nweba isikhathi esivulekile: Ukugcinwa kwamanzi kuvimbela okunamathelayo ukuthi some ngokushesha ngesikhathi sokwakha, kunwebe isikhathi sokulungiswa kokubeka i-tile.
2. Thuthukisa ukusebenza kokwakhiwa
Isimiso: I-HPMC inomphumela omuhle wokuqina, futhi ama-molecule ayo angakha isakhiwo esifana nenethiwekhi kusisombululo esinamanzi, ngaleyo ndlela andise i-viscosity yesisombululo.
Thuthukisa indawo elwa nokucwila: I-slurry ewugqinsi inendawo engcono yokulwa nokucwila phakathi nenqubo yokwakha, ukuze amathayela ahlale azinzile endaweni enqunywe kusengaphambili phakathi nenqubo yokugandaywa futhi ngeke ashelele phansi ngenxa yamandla adonsela phansi.
Thuthukisa i-fluidity: I-viscosity efanelekile yenza i-adhesive ibe lula futhi isakazeke ngesikhathi sokwakhiwa, futhi ngesikhathi esifanayo inokusebenza okuhle, inciphisa ubunzima bokwakha.
3. Thuthukisa ukuqina
Isimiso: I-HPMC ithuthukisa ukugcinwa kwamanzi nokunamathela kwe-adhesive, ngaleyo ndlela ithuthukise ukuqina kwe-adhesive ye-tile esekelwe kusimende.
Thuthukisa amandla okubopha: I-substrate yesimende egcwele amanzi amaningi inikeza ukunamathela okuqinile futhi ayijwayele ukuwa noma ukuqhekeka ngesikhathi sokusetshenziswa isikhathi eside.
Thuthukisa ukumelana nokuqhekeka: Ukugcinwa kahle kwamanzi kugwema ukuncipha okukhulu kwe-adhesive phakathi nenqubo yokomisa, ngaleyo ndlela kunciphisa inkinga yokuqhekeka okubangelwa ukushwabana.
(3) Ukusekelwa kwedatha yokuhlola
1. Ukuhlolwa kokugcinwa kwamanzi
Ucwaningo luye lwabonisa ukuthi izinga lokugcinwa kwamanzi lokunamathela kwamathayela asekelwe kusimende ngokungezwa kwe-HPMC lithuthuke kakhulu. Isibonelo, ukwengeza u-0.2% we-HPMC kokunamathiselwe kungakhuphula izinga lokugcinwa kwamanzi lisuka ku-70% liye ku-95%. Lokhu kuthuthukiswa kubalulekile ekuthuthukiseni amandla okubopha kanye nokuqina kwe-adhesive.
2. Ukuhlolwa kwe-viscosity
Inani le-HPMC elingeziwe linomthelela omkhulu ku-viscosity. Ukwengeza u-0.3% we-HPMC ekunamatheliseni kukathayela okusekelwe kusimende kungakhuphula i-viscosity izikhathi ezimbalwa, kuqinisekiswe ukuthi okunamathelayo kunokusebenza okuhle kokulwa nokuhlehla kanye nokusebenza kokwakha.
3. Ukuhlolwa kwamandla ebhondi
Ngokuhlolwa okuqhathanisayo, kutholwe ukuthi amandla okubopha phakathi kwamathayili nama-substrates enamathela aqukethe i-HPMC angcono kakhulu kunalawo okunamathelayo ngaphandle kwe-HPMC. Isibonelo, ngemva kokwengeza u-0.5% we-HPMC, amandla okubopha anganyuswa cishe ngo-30%.
(4) Izibonelo zohlelo lokusebenza
1. Ukufakwa kwama-tiles aphansi nama-tiles odongeni
Ekubekweni kwangempela kwamathayela aphansi namathayili odongeni, okunamathelisa okusekelwe kusimende okuthuthukisiwe kwe-HPMC kubonise ukusebenza okungcono kakhulu kokwakhiwa kanye nesibopho esihlala njalo. Ngesikhathi senqubo yokwakha, i-adhesive akulula ukulahlekelwa amanzi ngokushesha, iqinisekisa ukubushelelezi kokwakhiwa kanye nokuqina kwama-tile.
2. Uhlelo lwangaphandle lokufakwa kwezindonga
Izinamathiselo ezithuthukisiwe ze-HPMC nazo zisetshenziswa kabanzi ezinhlelweni zokuvikela odongeni zangaphandle. Ukugcinwa kwayo kwamanzi okuhle kakhulu nokunamathela kuqinisekisa isibopho esiqinile phakathi kwebhodi lokufaka udonga nodonga, ngaleyo ndlela kuthuthukisa ukuqina nokuzinza kwesistimu yokufaka udonga lwangaphandle.
Ukusetshenziswa kwe-HPMC kumathayela asekelwe kusimende kuthuthukisa kakhulu ukusebenza kwe-adhesive. Ngokuthuthukisa ukugcinwa kwamanzi, ukuthuthukisa ukusebenza komsebenzi wokwakha nokuthuthukisa ukuqina, i-HPMC yenza okunamathelayo okusekelwe kusimende kuhambisane nezidingo zokwakha zesimanje. Ngokuthuthuka kobuchwepheshe kanye nesidingo esikhulayo sezinto zokwakha ezisebenza kahle kakhulu, amathemba okufaka isicelo e-HPMC azoba banzi.
Isikhathi sokuthumela: Jun-26-2024