Hydroxypropyl methylcellulose (HPMC) yog ib qho tseem ceeb ntawm cov khoom siv polymer, uas feem ntau siv rau hauv cov txheej txheej hauv kev tsim kho. Nws tuaj yeem txhim kho kev tsim kho kev ua tau zoo thiab zoo ntawm putty. Nws tuaj yeem tsis tsuas yog txhim kho kev tsim kho ntawm putty, tab sis kuj txhim kho nws cov adhesion, dej tuav thiab tawg tsis kam, yog li nws muaj kev hwm heev hauv kev tsim kho.
1. Cov yam ntxwv tseem ceeb ntawm HPMC
HPMC yog non-ionic cellulose ether, uas yog tshuaj hloov kho los ntawm ntuj cellulose. Nws cov tshuaj aqueous muaj cov dej tuav zoo, thickening thiab adhesiveness, thiab tuaj yeem hloov kho rau ntau yam kev xav tau hauv kev tsim kho ib puag ncig. Tom qab HPMC yaj hauv dej, nws tuaj yeem tsim cov pob tshab thiab ruaj khov colloidal tov, uas tsis yooj yim cuam tshuam los ntawm tus nqi pH. Tsis tas li ntawd, nws kuj muaj zog tiv thaiv enzymatic hydrolysis, oxidation tsis kam, lub teeb tsis kam, acid tsis kam, alkali tsis kam thiab lwm yam ntxwv, uas ua rau HPMC muaj kev ua tau zoo nyob rau hauv ntau yam kev tsim kho ib puag ncig.
2. Lub hauv paus ntsiab lus ua haujlwm ntawm HPMC hauv txheej txheej
Hauv txheej txheej, HPMC feem ntau ua lub luag haujlwm hauv qab no:
Txhim khu kev tuav dej: HPMC muaj lub peev xwm tuav dej ruaj khov, uas tuaj yeem tiv thaiv cov dej hauv cov txheej txheej ntawm evaporating sai heev. Thaum lub sij hawm tsim cov txheej txheem putty, qhov saum npoo yuav ua kom qhuav vim dej evaporation, tab sis lub xub ntiag ntawm HPMC tuaj yeem khaws cov txheej txheem ntawm cov dej noo siab, yog li ncua lub sijhawm qhib ntawm putty, uas yog qhov zoo rau cov neeg ua haujlwm tsim kho. thiab kho, thiab tseem yuav pab cov putty kom tag nrho solidify thiab tsis txhob tawg los ntawm kev ziab sai heev.
Txhim kho thickening: HPMC muaj cov nyhuv thickening, uas tuaj yeem muab cov putty slurry zoo dua viscosity, yog li txhim kho nws daim ntawv thov kev ua haujlwm. Lub putty txheej yuav tsum muaj qee yam viscosity los pab kev tsim kho, thaum xyuas kom meej tias cov putty tuaj yeem sib npaug sib npaug thiab ruaj khov rau ntawm phab ntsa. Cov nyhuv thickening ntawm HPMC tuaj yeem pab cov txheej txheej putty kom ruaj khov, ua haujlwm smoother thiab txo qhov tshwm sim ntawm sagging thiab slipping thaum lub sij hawm tsim kho.
Txhim kho cov kab nrib pleb: Ib qho teeb meem tshwm sim hauv cov txheej txheem ziab ntawm cov txheej txheej putty yog tsim cov kab nrib pleb me me, uas cuam tshuam rau qhov zoo ntawm cov khoom tiav. HPMC tuaj yeem tiv thaiv cov kab nrib pleb hauv txheej txheej vim tias nws tuaj yeem tsim cov qauv fiber ntau ruaj khov tom qab lub putty kho tau, yog li txhim kho cov tawv tawv ntawm putty thiab txo qhov tawg los ntawm kev ziab shrinkage thiab kub ntxhov.
Txhim kho kev tsim kho: HPMC tuaj yeem txhim kho qhov smoothness ntawm putty kev tsim kho, ua rau nws tsis tshua muaj teeb meem xws li tailing thiab riam cim thaum lub sij hawm tsim kho. Cov tshuaj colloidal tsim los ntawm HPMC hauv dej muaj cov nyhuv lubricating zoo, uas tuaj yeem ua rau cov putty smoother thaum smoothing thiab polishing, yog li txo qhov nyuaj ntawm kev tsim kho.
Txhim kho adhesion: HPMC tuaj yeem txhim kho qhov adhesion ntawm cov txheej txheej putty thiab cov phab ntsa hauv paus, tiv thaiv cov txheej putty los ntawm kev poob los yog bulging. Cov tshuaj colloidal tsim los ntawm HPMC nyob rau hauv lub putty tuaj yeem ua ke nrog lub hauv paus nto kom muaj zog adhesion ntawm putty. Qhov zoo adhesion tuaj yeem ua kom ntseeg tau tias cov txheej txheej putty tseem nyob ruaj khov rau lub sijhawm ntev tom qab kev tsim kho, txhim kho lub durability ntawm tag nrho cov hniav zoo nkauj.
3. Qhov zoo thiab muaj peev xwm ntawm kev thov ntawm HPMC
Qhov zoo ntawm HPMC nyob rau hauv daim ntawv thov ntawm putty txheej yog feem ntau xav txog nyob rau hauv cov nram qab no yam:
Txhim kho kev tsim kho ntawm putty: Txij li HPMC tuaj yeem txuas ntxiv lub sijhawm qhib ntawm putty, cov neeg ua haujlwm tsim kho tuaj yeem ua tiav cov txheej txheem putty hauv lub sijhawm txaus, txo lub sijhawm xav tau rau kev thov rov ua dua, thiab tseem txo qhov nyuaj ntawm kev tsim kho.
Txuag cov ntaub ntawv putty: Cov nyhuv thickening ntawm HPMC tuaj yeem txo cov dej volatilization, yog li ua kom cov khoom sib xws ntawm putty, ua putty ntau yig, txo cov nqi ntawm cov ntaub ntawv putty, thiab txo cov nqi tsim kho.
Muaj feem xyuam rau ntau hom phab ntsa substrates: HPMC tuaj yeem hloov kho tau zoo rau ntau hom substrates xws li cov phab ntsa pob zeb thiab mortar bases, thiab tuaj yeem txhim kho adhesion thiab kev tsim vaj tse rau ntau hom substrate.
Muaj zog yoog raws kev nyab xeeb: Txij li HPMC muaj cov dej tuav ruaj khov thiab ruaj khov, txawm tias nws tau tsim nyob rau hauv qhov chaw kub lossis cov av qis, nws tuaj yeem cuam tshuam cov dej sai sai hauv cov txheej txheej putty thiab ua kom cov nyhuv zoo ntawm putty.
IV. Kev ceev faj rau kev siv HPMC
Hauv kev siv tiag tiag, tus nqi thiab txoj hauv kev ntxiv HPMC yuav cuam tshuam qhov kev ua tau zoo kawg ntawm putty. Raws li ib txwm muaj, tus nqi ntawm HPMC ntxiv yuav tsum yog nruab nrab. Yog tias ntxiv ntau dhau lawm, lub sijhawm ziab ntawm cov txheej txheej yuav raug ncua ntev, cuam tshuam rau kev tsim kho. Yog li ntawd, thaum siv nws, tus nqi yuav tsum tau tswj kom tsim nyog raws li cov yam ntxwv ntawm cov khoom putty thiab qhov chaw tsim kho. Tsis tas li ntawd, HPMC yuav tsum tau muab cia rau hauv qhov chaw ntub dej kom tsis txhob nqus dej noo thiab agglomerating, uas yuav cuam tshuam rau kev siv.
Daim ntawv thov ntawm HPMC nyob rau hauv lub putty txheej zoo txhim kho kev ua hauj lwm, dej tuav thiab tawg tsis kam ntawm putty, ua rau nws muaj zoo heev tshwm sim nyob rau hauv ntau yam kev tsim kho. Los ntawm kev ntxiv tus nqi tsim nyog ntawm HPMC, tus tsim qauv tuaj yeem tswj tau yooj yim dua cov txheej txheem ntawm cov putty, txhim kho qhov flatness ntawm putty txheej thiab qhov zoo ntawm cov khoom tiav. Yog li ntawd, daim ntawv thov ntawm HPMC nyob rau hauv lub putty txheej tsis tau tsuas yog ho txhim kho cov nyhuv ntawm kev tsim kho, tab sis kuj txuas ntxiv lub neej kev pab cuam ntawm cov hniav txheej, muab ib tug muaj zog lav rau cov tsos thiab sab hauv cov teebmeem ntawm lub tsev.
Post lub sij hawm: Nov-02-2024