I-Hydroxypropyl methyl cellulose (HPMC) viscosity ye-Skim coat?
– impendulo: Ijazi le-skim lilungile ngokuvamile i-HPMC 100000cps, ezinye zinde kunezidingo ze-mortar, zifuna ikhono lokusebenzisa i-150000cps. Ngaphezu kwalokho, i-HPMC iyindima ebaluleke kakhulu yokugcina amanzi, kulandelwe ukuqina. Ku-skim coat, inqobo nje uma ukugcina amanzi kukuhle, i-viscosity iphansi (7-80000), kungenzeka futhi, vele, i-viscosity inkulu, ukugcinwa kwamanzi okuhlobene kungcono, lapho i-viscosity ingaphezu kwezinkulungwane eziyi-100, i-viscosity yokugcinwa kwamanzi ayiningi.
Yiziphi izinkomba zobuchwepheshe eziyinhloko ze-hydroxypropyl methyl cellulose (HPMC)?
Impendulo: Okuqukethwe kwe-hydroxypropyl kanye ne-viscosity, abasebenzisi abaningi bayakhathalela lezi zinkomba ezimbili. Okuqukethwe kwe-hydroxypropyl kuphezulu, ukugcinwa kwamanzi ngokuvamile kungcono. Ukuqina, ukugcinwa kwamanzi, isihlobo (kodwa hhayi ngokuphelele) nakho kungcono, kanye ne-viscosity, i-cement mortar kungcono ukuyisebenzisa.
I-Hydroxypropyl methyl cellulose (HPMC) yiziphi izinto zokusetshenziswa eziyinhloko?
Impendulo: izinto zokusetshenziswa eziyinhloko ze-hydroxypropyl methyl cellulose (HPMC): ukotini ocolisisiwe, i-chloromethane, i-propylene oxide, ezinye izinto zokusetshenziswa, i-tablet alkali, i-acid, i-toluene, i-isopropyl alcohol njalo njalo.
I-HPMC ejazini le-Skim ekusetshenzisweni, indima eyinhloko, ingabe ikhemikhali?
Impendulo: I-HPMC ku-Skim coat, ukuqina, amanzi kanye nokwakhiwa kwezindima ezintathu. Ukuqina: i-cellulose ingaqiniswa ibe yi-suspension, ukuze isixazululo sihlale sifana phezulu naphansi indima yokulenga okulwa nokugeleza. Ukugcinwa kwamanzi: yenza i-Skim coat yome kancane, i-calcium eyisizayo empunga ekusebenzeni kokusabela kwamanzi. Ukwakhiwa: i-cellulose lubrication, ingenza i-Skim coat inokwakhiwa okuhle. I-HPMC ayihlanganyeli kunoma yikuphi ukusabela kwamakhemikhali, kodwa idlala indima yokusekela kuphela. I-Skim coat namanzi, odongeni, ukusabela kwamakhemikhali, ngenxa yokukhiqizwa kwezinto ezintsha, udonga lwe-Skim coat luyehla lusuka odongeni, lugaywe lube yimpuphu, bese lusetshenziswa, hhayi okuhle, ngoba seludale into entsha (i-calcium carbonate). Izingxenye eziyinhloko zempuphu ye-calcium empunga yilezi: i-Ca(OH)2, i-CaO kanye nenani elincane lengxube ye-CaCO3, i-CaO+H2O=Ca(OH)2 – i-Ca(OH)2+CO2=CaCO3↓+H2O i-calcium empunga emanzini nasemoyeni ngaphansi kwesenzo se-CO2, ukwakheka kwe-calcium carbonate, kanye ne-HPMC kuphela amanzi, ukusabela okungcono kwe-calcium empunga, okwayo akuzange kuhlanganyele kunoma yikuphi ukusabela.
I-HPMC iyi-non-ionic cellulose ether, ngakho-ke iyini i-non-ionic?
A: Ngokuvamile, ama-non-ion ayizinto ezingayi-ion emanzini. I-ionization ukuhlukaniswa kwe-electrolyte ibe ama-ion ashajekile ahamba ngokukhululeka ku-solvent ethile, njengamanzi noma utshwala. Isibonelo, usawoti esiwudla nsuku zonke — i-sodium chloride (NaCl) iyancibilika emanzini bese iyayi-ion ukuze ikhiqize ama-ion e-sodium ahamba ngokukhululeka (Na+) ane-chaji enhle kanye nama-ion e-chloride (Cl) ane-chaji engalungile. Okusho ukuthi, i-HPMC emanzini ayihlukani nama-ion ashajekile, kodwa ikhona njengama-molecule.
Lihlobene kanjani izinga lokushisa le-gelation le-hydroxypropyl methyl cellulose?
Impendulo: Izinga lokushisa lejeli le-HPMC lihlobene nokuqukethwe kwe-methoxyl. Uma okuqukethwe kwe-methoxyl kuphansi, izinga lokushisa lejeli liphakeme.
Ufulawa wejazi elithambile kanye ne-HPMC akukho buhlobo?
Impendulo: Impuphu ye-skim coat drop ikakhulukazi kanye nekhwalithi ye-calcium yomlotha inobuhlobo obukhulu kakhulu, futhi i-HPMC ayinabo ubuhlobo obukhulu kakhulu. Okuqukethwe kwe-calcium ephansi ye-calcium empunga kanye nesilinganiso esingafanele se-CaO kanye ne-Ca(OH)2 ku-calcium empunga kuzobangela ukuwa kwempuphu. Uma kukhona ubuhlobo ne-HPMC, khona-ke ukugcinwa kwamanzi okungekuhle kwe-HPMC nakho kuzobangela ukulahleka kwempuphu.
Uyini umehluko phakathi kwe-hydroxypropyl methyl cellulose encibilikayo emanzini abandayo kanye ne-hot soluble hydroxypropyl methyl cellulose enqubweni yokukhiqiza?
– Impendulo: Uhlobo lwesisombululo esisheshayo samanzi abandayo i-HPMC lungemva kokwelashwa kobuso be-glyoxal, lufakwa emanzini abandayo ahlakazeka ngokushesha, kodwa aluncibiliki ngempela, i-viscosity iyanda, iyancibilika. Uhlobo oluncibilika kalula aluzange luphathwe ubuso nge-glyoxal. Inani le-glyoxal likhulu, ukuhlakazeka kuyashesha, kodwa i-viscosity iyahamba kancane, inani lincane, ngokuphambene nalokho.
Yini enukayo nge-hydroxypropyl methyl cellulose (HPMC)?
– Impendulo: I-HPMC ekhiqizwa ngendlela ye-solvent yenziwe nge-toluene kanye ne-isopropyl alcohol. Uma ukuwasha kungekuhle kakhulu, kuzoba nokunambitheka okusele.
Ukusetshenziswa okuhlukile, ungayikhetha kanjani i-hydroxypropyl methyl cellulose (HPMC) efanele?
– impendulo: cela ukukhathala ngokufaka impuphu yengane: isidingo siphansi, i-viscosity ingu-100000, kulungile, kubalulekile ukuvikela amanzi ukuze ube seduze. Ukufaka udaka: izidingo eziphezulu, izidingo ze-viscosity ephezulu, u-150000 ukuze ube ngcono. Ukufaka iglue: isidingo semikhiqizo esheshayo, i-viscosity ephezulu.
Liyini elinye igama le-hydroxypropyl methyl cellulose?
– IMPENDULO: I-Hydroxypropyl MethylCellulose, efinyeziwe njenge-HPMC noma i-MHPC, noma i-Hydroxypropyl Methyl Cellulose; i-Cellulose hydroxypropyl methyl ether; i-Hypromellose, i-Cellulose, i-2-hydroxypropyl methyl i-Cellulose ether.
I-HPMC ekusetshenzisweni kwejazi le-Skim, kungani i-Skim coat bubble ibangela?
Impendulo: I-HPMC ku-skim coat, ukuqina, amanzi kanye nokwakhiwa kwezindima ezintathu. Ayihlanganyeli kunoma yikuphi ukusabela. Izimbangela zama-bubbles: 1, amanzi amaningi kakhulu. 2, phansi ayomile, phezulu kwengqimba yokuklwebheka, futhi kulula ukuyibhamuza.
Udonga lwangaphakathi nolwangaphandle Ifomula yejazi elingakhuli?
– impendulo: udonga lwangaphakathi Uboya obungenasici: i-calcium 800KG i-calcium empunga 150KG (i-starch ether, okuluhlaza okotshani okumsulwa, i-peng runtu, i-citric acid, i-polyacrylamide ingangezwa ngendlela efanele)
Udonga lwangaphandle olune-skim coat: usimende 350KG calcium 500KG quartz sand 150KG latex powder 8-12kg cellulose ether 3KG starch ether 0.5kg wood fibre 2KG
Uyini umehluko phakathi kwe-HPMC ne-MC?
– Impendulo: I-MC iyi-methyl cellulose, eyenziwe nge-cellulose ether ngokusebenzisa uchungechunge lwezimpendulo nge-methane chloride njenge-etherifying agent ngemva kokuba ukotini ocwengisisiwe uphathwe nge-alkali. Ngokuvamile, izinga lokushintsha liyi-1.6~2.0, futhi ukuncibilika kuyahlukahluka ngokwezinga lokushintsha. Ingeyama-nonionic cellulose ether.
(1) Ukugcinwa kwamanzi kwe-methyl cellulose kuncike enanini layo lokwengeza, i-viscosity, ubuncane bezinhlayiya kanye nezinga lokuncibilika. Ngokuvamile ukwengeza inani elikhulu, ubuncane obuncane, i-viscosity, izinga lokugcinwa kwamanzi liphezulu. Phakathi kwazo, inani le-additive linethonya elikhulu ekugcinweni kwamanzi, futhi i-viscosity ayilingani nokugcinwa kwamanzi. Izinga lokuncibilika lincike kakhulu ezingeni lokuguqulwa kobuso kanye nobuncane bezinhlayiya zezinhlayiya ze-cellulose. Kuma-ether amaningana e-cellulose angenhla, izinga lokugcinwa kwamanzi le-methyl cellulose kanye ne-hydroxypropyl methyl cellulose liphakeme.
(2) I-Methyl cellulose iyancibilika emanzini abandayo, okunzima ukuncibilika emanzini ashisayo. Isixazululo sayo samanzi sizinzile kakhulu ngaphakathi kwe-pH=3~12. Ihambisana kahle nesitashi, i-guanidine gum kanye nama-surfactants amaningi. I-Gelation yenzeka lapho izinga lokushisa lifinyelela izinga lokushisa le-gelation.
(3) Ukushintsha kwezinga lokushisa kuzothinta kakhulu izinga lokugcina amanzi le-methyl cellulose. Ngokuvamile, uma izinga lokushisa liphakeme, kuba kubi kakhulu ukugcinwa kwamanzi. Uma izinga lokushisa le-mortar lidlula u-40℃, ukugcinwa kwamanzi kwe-methyl cellulose kuzoba kubi kakhulu, okuthinta kakhulu ukwakheka kwe-mortar.
(4) I-Methyl cellulose inethonya elisobala ekwakhiweni nasekunamatheleni kwe-mortar. Igama elithi “Adhesion” lapha libhekisela ekunamatheleni okuzwakala yisisebenzi phakathi kwethuluzi kanye ne-substrate yodonga, okungukuthi ukumelana nokusika kwe-mortar. Ukunamathela kukhulu, ukumelana nokusika kwe-mortar kukhulu, amandla adingekayo yizisebenzi enkambisweni yokusebenzisa nawo makhulu, kanti ukwakhiwa kwe-mortar kuphansi. Emikhiqizweni ye-cellulose ether, ukunamathela kwe-methyl cellulose kusezingeni eliphakathi.
I-HPMC hydroxypropyl methyl cellulose, ihlungwa ngokotini ngemva kokwelashwa nge-alkali, nge-propylene oxide kanye ne-chloromethane njenge-ether e-etherifying, ngokusebenzisa uchungechunge lwezimpendulo futhi yenziwe nge-non-ionic cellulose mixed ether. Izinga lokushintshana ngokuvamile lingu-1.2 ~ 2.0. Izakhiwo zayo ziyahlukahluka ngokwesilinganiso sokuqukethwe kwe-methoxy kanye ne-hydroxypropyl.
(1) I-Hydroxypropyl methyl cellulose incibilika kalula emanzini abandayo, okunzima ukuncibilika emanzini ashisayo. Kodwa-ke, izinga lokushisa layo le-gelation emanzini ashisayo liphakeme ngokusobala kunele-methyl cellulose. Ukuncibilika kwe-methyl cellulose emanzini abandayo nakho kuthuthukiswe kakhulu.
(2) I-viscosity ye-hydroxypropyl methyl cellulose ihlobene nesisindo sayo sama-molecule, futhi uma isisindo sama-molecule siphakeme, i-viscosity iyanda. Izinga lokushisa lithinta ne-viscosity. I-viscosity iyancipha njengoba izinga lokushisa likhuphuka. Kodwa i-viscosity yayo umphumela wokushisa okuphezulu uphansi kunowe-methyl cellulose. Isixazululo sizinzile uma sigcinwa ekushiseni kwegumbi.
(3) I-Hydroxypropyl methyl cellulose izinzile ku-asidi kanye nesisekelo, futhi isixazululo sayo samanzi sizinzile kakhulu ku-pH=2~12. I-Caustic soda kanye namanzi e-lime awanawo umthelela omkhulu ezimpahleni zayo, kodwa i-alkali ingasheshisa izinga layo lokuncibilika futhi ithuthukise i-viscosity. I-Hydroxypropyl methyl cellulose izinzile ku-salts ejwayelekile, kodwa lapho ukuhlushwa kwesisombululo sikasawoti kuphezulu, i-viscosity yesisombululo se-hydroxypropyl methyl cellulose ivame ukwanda.
(4) Ukugcinwa kwamanzi kwe-hydroxypropyl methyl cellulose kuncike kumthamo wayo kanye nokuthamba kwayo, futhi izinga lokugcinwa kwamanzi kwe-hydroxypropyl methyl cellulose liphakeme kunele-methyl cellulose ngesilinganiso esifanayo.
(5) I-Hydroxypropyl methyl cellulose ingaxutshwa nama-polymer compounds ancibilikayo emanzini ukuze ibe yisisombululo esifanayo nesinobuthi esiphezulu. Njenge-polyvinyl alcohol, i-starch ether, i-vegetable glue njalo njalo.
(6) Ukunamathela kwe-hydroxypropyl methyl cellulose ekwakhiweni kwe-mortar kuphakeme kunokwe-methyl cellulose.
(7) I-Hydroxypropyl methyl cellulose inokumelana okungcono kwe-enzyme kune-methyl cellulose, futhi amathuba okuwohloka kwe-enzyme yesisombululo sayo aphansi kune-methyl cellulose.
Yini okufanele inakwe ekusebenzeni okungokoqobo mayelana nobudlelwano phakathi kwe-viscosity kanye nokushisa kwe-HPMC?
Impendulo: I-viscosity ye-HPMC ilingana nokushisa, okungukuthi, i-viscosity iyanda ngokuncipha kwezinga lokushisa. Uma sikhuluma nge-viscosity yomkhiqizo, sikhuluma nge-viscosity engu-2% yomkhiqizo emanzini kuma-degrees Celsius angu-20.
Ekusetshenzisweni okungokoqobo, ezindaweni ezinomehluko omkhulu wokushisa phakathi kwehlobo nobusika, kufanele kuqashelwe ukuthi kunconywa ukusebenzisa i-viscosity ephansi ebusika, okuyinto evumelana kakhulu nokwakhiwa. Ngaphandle kwalokho, uma izinga lokushisa liphansi, i-viscosity ye-cellulose izokwanda, futhi uma ikhuhla, umuzwa uzoba nzima.
I-viscosity ephakathi nendawo: 75000-100000 esetshenziswa kakhulu kwi-putty
Isizathu: Ukugcinwa kwamanzi okuhle
I-viscosity ephezulu: HPMC 150000-200000 isetshenziswa kakhulu ezintweni ze-glue powder ze-polystyrene insulation mortar kanye ne-vitrified beads insulation mortar.
Isizathu: ukujiya okuphezulu, udoti awulula ukuwulahla, ukugeleza kwamanzi kuyalenga, kuthuthukisa ukwakhiwa.
Kodwa ngokuvamile, uma i-viscosity iphakeme, kulapho ukugcinwa kwamanzi kuba ngcono khona, ngakho-ke izimboni eziningi ze-dry mortar, uma kucatshangelwa izindleko, zisebenzisa i-viscosity ephakathi ye-HPMC cellulose (75000-100000) ukuze zithathe indawo ye-viscosity ephakathi nephansi ye-HPMC cellulose (20000-40000) ukuze kuncishiswe inani lokwengeza.
Isikhathi sokuthunyelwe: Jan-10-2022