I-Hydroxypropyl Methylcellulose (HPMC) iyi-polymer evame ukusetshenziswa kwamanzi esetshenziswa kabanzi ezintweni zokwakha, ikakhulukazi ukunamathela okususelwa kusawoti okususelwa kusazi. Izakhiwo zamakhemikhali eziyingqayizivele nezakhiwo ezibonakalayo ze-HPMC zenza ukuba zibambe iqhaza elibalulekile ekuthuthukiseni ukunamathela, ukusebenza kokwakha, nokuqina kokunamathela kwamathayela.
(1) Ulwazi oluyisisekelo lwe-HPMC
1. Isakhiwo samakhemikhali se-HPMC
I-HPMC iyi-cellulose derivative etholwe ngamakhemikhali elungisa iselula yemvelo. Isakhiwo saso senziwa ikakhulukazi yi-methoxy (-Coch₃) kanye namaqembu we-hydroxypropoxy (-ch₂chohch₃) afaka amanye amaqembu e-hydroxyl ecaleni le-cellulose. Lesi sakhiwo sinikeza i-HPMC enhle ye-solubity kanye nekhono le-hydration.
2. Izakhiwo ezibonakalayo ze-HPMC
I-Solubinity: I-HPMC ingancibilika emanzini abandayo ukwakha ikhambi le-colloidal elibonakalayo futhi linekhono elihle le-hydration nekhono.
I-Thermogelation: Isixazululo se-HPMC sizokwakha ijeli lapho kufudunyezwa futhi kubuyela esimweni se-liquid ngemuva kokupholisa.
Umsebenzi ongaphezulu: I-HPMC inomsebenzi omuhle ongaphezulu kwesixazululo, esiza ukwakha isakhiwo se-bubble esizinzile.
Lezi zindawo ezihlukile zomzimba nezamakhemikhali zenza i-HPMC ibe yinto efanelekile yokuguqula ama-adhesives asuselwa kuso usimende.
(2) Indlela ye-HPMC ethuthukisa ukusebenza kwamasimu asuselwa ku-tile
1. Thuthukisa ukugcinwa kwamanzi
Isimiso: I-HPMC yakha isakhiwo senethiwekhi ye-viscous kwisixazululo, esingakhiya ngempumelelo umswakama. Leli khono lokugcina amanzi libangelwa inani elikhulu lamaqembu ama-hydrophilic (anjengeqembu le-hydroxy) kuma-molecule we-HPMC, angakwazi ukudonsa futhi agcine inani elikhulu lomswakama.
Thuthukisa i-Adhesion: Adhesives asuselwa kusimende adinga umswakama ukuze ubambe iqhaza ekuphenduleni kwe-hydration ngesikhathi senqubo enzima. I-HPMC igcina ukuba khona komswakama, okuvumela i-CEAND iye ku-hydrate ngokuphelele, ngaleyo ndlela kuthuthukise ukunamathela kokunamatheli.
Nweba isikhathi esivulekile: Ukugcinwa kwamanzi kuvimbela ukunamathela ekumiseni ngokushesha ngesikhathi sokwakha, ukunweba isikhathi sokulungiswa kwe-tile ukubekwa.
2. Thuthukisa ukusebenza kokwakha
Isimiso: I-HPMC inomphumela omuhle wokuqina, futhi ama-molecule awo angakha isakhiwo esinjengenethiwekhi kwikhambi elinamanzi, ngaleyo ndlela akhuphule ukubonwa kwesixazululo.
Thuthukisa impahla elwa nama-anti-sagging
Thuthukisa u-Fluity: I-viscosity efanelekile yenza ukubambelela kube lula ukusebenzisa futhi kusakaze ngesikhathi sokwakha, futhi ngasikhathi sinye kunokusebenza okuhle, kunciphisa ubunzima bokwakha.
3. Thuthukisa ukuqina
Isimiso: I-HPMC ithuthukisa ukugcinwa kwamanzi nokunamathela kokunamathelisa, ngaleyo ndlela kuthuthukise ukuqina kokunamathela kwesimende-esekwe kuthunyelwa.
Thuthukisa amandla okubopha
Ukuthuthukisa ukumelana kokuqhekeka: Ukugcinwa kwamanzi okuhle kuvimbela ukushwabana kwamanzi okukhulu kokunamathela ngesikhathi senqubo yokomisa, ngaleyo ndlela kunciphise inkinga yokuqhekeka okubangelwa yi-shrinkage.
(3) ukwesekwa kwedatha yokuhlola
1. Ukuhlolwa kwamanzi okugcina amanzi
Ucwaningo lukhombisile ukuthi izinga lokugcina lamanzi lokunamathela kwesimende-esekwe okolweni lokungezelela kwe-HPMC lathuthukiswa kakhulu. Isibonelo, engeza i-HPMC engu-0.2% kwi-adhesive ingakhuphula izinga lokugcinwa kwamanzi lisuka kuma-70% laya ku-95%. Lokhu kuthuthukiswa kubalulekile ekuthuthukiseni amandla okuqinisa nokuqina kokunamathela.
2. Ukuhlolwa kwe-Viscosity
Inani le-HPMC elingeziwe linomthelela obalulekile ekuboneni. Ukungeza i-HPMC engu-0.3% ku-Cement-based tile adhesive kungakhulisa i-viscosity amahlandla amahlandla amaningi, ukuqinisekisa ukuthi ukunamathela kunokusebenza okuhle nokusebenza okuvinjelwe.
3. Ukuhlolwa kwamandla kwebhondi
Ngokuhlola ukuqhathanisa, kwatholakala ukuthi amandla eBonding phakathi kwamathayili kanye nezindawo zokuhlobisa ezinama-adhesives aqukethe i-HPMC zingcono kakhulu kunalezo ezinamathela ngaphandle kwalezo ze-HPMC. Isibonelo, ngemuva kokungeza i-0.5% HPMC, amandla eBonding angandiswa cishe ngama-30%.
(4) Izibonelo zohlelo lokusebenza
1. Ukubekwa kwamathayili phansi kanye namathayili odonga
Ekufakweni kwangempela kwamathayili phansi kanye namathayili odonga, adhesives asuselwa ku-tile asuselwa kuso usimende osuselwa ku-HPMC akhombisa ukusebenza okungcono kokwakha kanye nokubopha okuhlala njalo. Ngesikhathi senqubo yokwakha, okunamathelayo akulula ukulahlekelwa ngamanzi ngokushesha, kuqinisekisa ukushelela kokwakhiwa kanye nokufutheka kwamathayili.
2
Ama-adhesives athuthukisiwe we-HPMC nawo asetshenziswa kabanzi ezinhlelweni zezinhlelo zangaphandle zodonga. Ukugcinwa kwamanzi okuhle kakhulu nokunamathela kwayo kuqinisekisa isibopho esiqinile phakathi kwebhodi lokufakwa kanye nodonga, ngaleyo ndlela kuthuthukise ukuqina nokuqina kohlelo lwangaphandle lokufakelwa kodonga lwangaphandle.
Ukusetshenziswa kwe-HPMC ku-Cement-based Tile Adhesives kuthuthukisa ukusebenza kokunamathelisa. Ngokwenza ukugcinwa kwamanzi, ukuthuthukisa ukusebenza kokwakha kanye nokwenza ngcono ukuqina, i-HPMC yenza izinamathiseli ze-tenti ezisuselwa kusawokukhulisa amasimende alungele izidingo zanamuhla zokwakha. Ngokuthuthukiswa kobuchwepheshe kanye nesidingo esandayo sezinto zokwakha ukusebenza kahle, amathemba wesicelo se-HPMC azoba abanzi.
Isikhathi sePosi: Jun-26-2024