Hydroxypropyl methylcellulose (HPMC) yog ib qho tseem ceeb additive nyob rau hauv niaj hnub pobzeb adhesives thiab siv tshuaj admixtures. Nws cov khoom siv ntau yam txhim kho txhua yam ntawm cov nplaum nplaum, pab txhim kho kev ua haujlwm, dej tuav, adhesion thiab kev ua haujlwm tag nrho.
Kev tsim kho kev lag luam txuas ntxiv mus nrhiav cov kev daws teeb meem tshiab los txhim kho kev ua tau zoo thiab ua haujlwm ntev ntawm cov khoom siv hauv tsev. Ntawm cov khoom siv ntau yam siv hauv kev tsim kho tshuaj, hydroxypropyl methylcellulose (HPMC) tau nyiam vim nws ntau yam zoo hauv cov nplais nplaum thiab cov khoom siv tshuaj lom neeg. HPMC yog ib qho derivative ntawm cellulose nrog cov khoom tshwj xeeb uas tuaj yeem cuam tshuam zoo rau kev ua haujlwm ntawm cov nplaum thiab txhim kho tag nrho cov haujlwm zoo ntawm kev tsim kho. Lub hom phiaj ntawm tsab xov xwm no yog los tshawb txog lub luag haujlwm thiab cov txiaj ntsig ntawm HPMC hauv cov nplais nplaum thiab cov khoom siv tshuaj lom neeg, elucidating nws cov tshuaj muaj pes tsawg leeg, cov txheej txheem ntawm kev ua thiab qhov zoo uas nws muaj rau kev tsim kho kev lag luam.
1. Tshuaj muaj pes tsawg leeg thiab cov khoom ntawm HPMC:
Hydroxypropyl methylcellulose (HPMC) yog ib qho khoom siv hluav taws xob semi-synthetic hloov kho los ntawm cellulose. Nws yog synthesized los ntawm kev kho cellulose nrog propylene oxide thiab methyl chloride, ua ib tug compound nrog hydroxypropyl thiab methyl substituents (-OH thiab -CH3 pawg) txuas rau cellulose qaum. Qib ntawm kev hloov pauv (DS) ntawm hydroxypropyl thiab methyl pawg txiav txim siab cov khoom ntawm HPMC, suav nrog viscosity, solubility, thiab thermal stability.
HPMC muaj cov dej solubility zoo heev thiab tsim cov kua dej ntshiab thiab muaj kuab paug thaum tawg hauv dej. Txawm li cas los xij, nws cov solubility nyob ntawm qhov kub thiab txias, nrog rau qhov kub siab dua nyiam kev tawg. Cov cuab yeej no ua rau HPMC tsim nyog rau kev siv hauv kev tsim cov tshuaj lom neeg uas muaj cov kab dej hauv dej. Tsis tas li ntawd, HPMC muab tus cwj pwm pseudoplastic rau kev daws teeb meem, txhais tau hais tias nws cov viscosity txo qis hauv kev ntxhov siab, yog li ua kom yooj yim ntawm daim ntawv thov thiab txhim kho cov txheej txheem ntawm cov nplaum nplaum.
2. Lub mechanism ntawm kev txiav txim ntawm ceramic pobzeb nplaum:
Hauv cov ntawv nplaum nplaum nplaum, HPMC ua haujlwm ntau yam vim nws cov qauv tshuaj lom neeg tshwj xeeb thiab cov khoom. Ib qho ntawm nws lub luag haujlwm tseem ceeb yog los ua cov thickener, txhim kho qhov sib xws thiab kev ua haujlwm ntawm cov nplaum. Los ntawm kev nce viscosity, HPMC pab tiv thaiv cov nplaum nplaum los ntawm sagging los yog collapsing, kom ntseeg tau tias tsim nyog thiab kev sib raug zoo ntawm cov pobzeb thiab substrate.
HPMC kuj ua raws li tus neeg saib xyuas dej, tso cai rau cov nplaum kom muaj cov dej noo txaus thaum lub sijhawm kho. Cov cuab yeej no yog qhov tseem ceeb los xyuas kom meej hydration ntawm cov khoom cementitious nyob rau hauv cov nplaum, txhawb kev ruaj khov thiab txo qis kev pheej hmoo ntawm kev tawg tawg. Tsis tas li ntawd, HPMC lub peev xwm tuav dej pab txuas ntxiv lub sijhawm qhib, tso cai rau lub sijhawm txaus rau cov pobzeb tso thiab hloov kho ua ntej cov nplaum nplaum.
HPMC tsim cov zaj duab xis hloov tau yooj yim thiab nplaum thaum ziab, yog li txhim kho cov khoom sib txuas ntawm cov nplais nplaum. Cov yeeb yaj kiab ua raws li cov nplaum nplaum, txhawb kev sib txuas ntawm cov nplaum nplaum, cov vuas thiab substrate. Lub xub ntiag ntawm HPMC txhim kho tag nrho cov ntawv cog lus muaj zog thiab ua haujlwm ntev ntawm cov pobzeb teeb tsa, txo cov peev txheej rau kev sib tham lossis kev sib cais thaum lub sijhawm.
3. Kev cuam tshuam rau kev tsim kho tshuaj admixtures:
Ntxiv nrog rau cov nplais nplaum, HPMC tau siv dav hauv ntau hom kev siv tshuaj lom neeg, suav nrog tshuaj khib, plasters thiab grouts. Nws multifunctional zog ua rau nws ib tug indispensable additive los txhim kho cov kev ua tau zoo thiab durability ntawm cov ntaub ntawv. Hauv mortars, HPMC ua raws li kev hloov kho rheology, tswj tus cwj pwm ntws thiab sib xws ntawm qhov sib tov. Qhov no ua kom cov ntaub ntawv sib xws thiab txhim kho kev ua haujlwm, ua kom yooj yim tso thiab txo cov khoom pov tseg.
HPMC pab txhim kho tus kheej-leveling cov khoom ntawm cov khoom siv hauv pem teb thiab SCR cov noob, tso cai rau kom du, txawm nto. Nws lub peev xwm tuav dej tiv thaiv qhov sib xyaw kom qhuav tawm ntxov, txhawb kev kho kom zoo thiab txo qis qhov tsis zoo xws li tawg lossis tawg. Tsis tas li ntawd, HPMC txhim kho qhov adhesion thiab adhesion ntawm plasters thiab grouts, uas ua rau muaj zog, zoo nkauj tiav tiav.
Kev siv HPMC nyob rau hauv kev tsim kho tshuaj admixtures yog nyob rau hauv txoj kab nrog rau kev tsim kho lub hom phiaj sustainability. Los ntawm kev txhim kho kev ua tau zoo thiab txo cov khoom siv, HPMC pab txhawb kom muaj txiaj ntsig zoo thiab txo cov pov tseg. Tsis tas li ntawd, nws lub luag haujlwm hauv kev txhim kho lub zog ntawm cov khoom siv hauv tsev pab txuas ntxiv lub neej ntawm lub tsev, yog li txo qis kev xav tau kev kho ntau zaus lossis hloov pauv.
Hydroxypropyl methylcellulose (HPMC) ua lub luag haujlwm tseem ceeb hauv cov pobzeb niaj hnub thiab cov khoom siv tshuaj lom neeg, muab ntau yam txiaj ntsig uas pab txhim kho kev ua haujlwm, ua haujlwm tau zoo thiab ua haujlwm ntev. Nws cov tshuaj lom neeg muaj pes tsawg leeg thiab cov khoom siv ua kom nws ua kom cov thickener, dej tuav tus neeg sawv cev thiab kev txhawb nqa adhesion hauv cov ntawv nplaum. Tsis tas li ntawd, HPMC txhim kho cov khoom rheological ntawm cov khoom siv tshuaj lom neeg los pab txhawb kev thov thiab xyuas kom muaj kev sib luag ntawm cov khoom tiav.
Kev siv dav dav ntawm HPMC hauv kev tsim kho kev lag luam qhia txog nws qhov tseem ceeb raws li kev siv ntau yam ntxiv uas txhim kho qhov zoo thiab ruaj khov ntawm cov khoom siv hauv tsev. Raws li kev tsim kho txuas ntxiv mus ntxiv, qhov xav tau ntawm cov kev daws teeb meem tshiab los txhim kho kev ua tau zoo thiab kav ntev yuav ua rau muaj kev tshawb fawb ntxiv thiab kev tsim kho ntawm HPMC-based formulations. Los ntawm kev siv lub peev xwm ntawm HPMC, kev tsim kho kev lag luam tuaj yeem paub txog kev nce qib hauv cov khoom siv tau zoo thiab pab txhawb rau kev txhim kho ntawm ib puag ncig zoo thiab ruaj khov.
Post lub sij hawm: Feb-26-2024