Hydroxypropyl methylcellulose (HPMC) yog ib qho khoom siv ntau yam siv dav hauv kev tsim kho kev lag luam, tshwj xeeb tshaj yog nyob rau hauv qhuav mix mortar formulations. Cov tshuaj no belongs rau tsev neeg cellulose ether thiab yog muab los ntawm ntuj cellulose. HPMC yog synthesized los ntawm kev kho cellulose nrog propylene oxide thiab methyl chloride, ua rau hloov cellulose nrog txhim khu kev qha. Qhov sib ntxiv ntawm HPMC rau qhuav mix mortar formulations imparts ntau yam khoom tsim nyog, ua rau nws yog ib qho tseem ceeb muaj nyob rau hauv kev tsim kho cov tsev niaj hnub thiab cov qauv.
A.HPMC qauv thiab kev ua haujlwm:
1.Chemical qauv:
Hydroxypropylmethylcellulose muaj ib tug complex qauv uas muaj hydrophilic thiab hydrophobic qhov chaw. Cov pab pawg hydroxypropyl thiab methyl tau qhia thaum lub sijhawm ua ke muab cov molecule tshwj xeeb.
2. Dej solubility:
HPMC yog dej-soluble, tso cai rau nws yaj nyob rau hauv dej txias los tsim ib tug ntshiab thiab viscos kua. Cov cuab yeej no yog qhov tseem ceeb hauv kev siv cov khoom sib xyaw qhuav vim nws ua kom muaj kev sib cais thiab sib xws ntawm qhov kawg sib xyaw.
3. Thermal gelation:
HPMC tau dhau los ua cov txheej txheem thermogelling rov qab, txhais tau tias nws tuaj yeem tsim cov gel thaum cua sov thiab rov qab mus rau cov tshuaj thaum txias. Qhov kev coj cwj pwm no pab txhim kho cov dej tuav thiab kev ua haujlwm ntawm cov tshuaj khib nyiab.
4. Zaj duab xis tsim muaj peev xwm:
HPMC muaj cov khoom ua yeeb yaj kiab thiab tsim cov yeeb yaj kiab tiv thaiv ntawm qhov chaw ntawm cov khoom khib nyiab. Cov zaj duab xis txhim kho adhesion, txo cov plua plav, thiab txhim kho tag nrho cov kav ntev ntawm cov mortar.
B.Lub luag hauj lwm ntawm HPMC nyob rau hauv qhuav mix mortar:
1. Kev tuav dej:
Ib qho ntawm cov haujlwm tseem ceeb ntawm HPMC hauv cov tshuaj khib nyiab qhuav yog txhawm rau txhim kho cov dej tuav. Qhov hydrophilic xwm ntawm HPMC molecule tso cai rau nws nqus thiab khaws cov dej noo, tiv thaiv cov mortar los ntawm ziab tawm ntxov ntxov. Qhov no yog qhov tseem ceeb rau kev ua haujlwm ntev thiab kho kom raug ntawm cov tshuaj khib nyiab.
2. Txhim kho kev ua haujlwm:
Ntxiv HPMC rau qhuav mix mortar formulations txhim kho kev ua haujlwm thiab sib xws. Nws pab ua kom muaj kev sib luag thiab txawm tias daim ntawv thov ntawm mortar, ua kom yooj yim rau kev lis thiab qhov chaw.
3. Txo sagging:
HPMC pab txhawb rau sag tsis kam ntawm mortar, tiv thaiv nws los ntawm collapsing los yog sagging ntawm ntsug nto. Qhov no tseem ceeb tshwj xeeb tshaj yog thaum ua haujlwm ntawm qhov siab lossis ntawm phab ntsa.
4. Txhim kho adhesion:
Lub peev xwm ua yeeb yaj kiab ntawm HPMC pab txhim kho qhov adhesion ntawm mortar thiab ntau yam substrates. Qhov no yog qhov tseem ceeb rau kev ua tiav cov ntawv cog lus muaj zog thiab kav ntev hauv kev tsim kho.
5. Qhov cuam tshuam rau lub sijhawm teem sijhawm:
Thaum HPMC tsis cuam tshuam rau lub sijhawm pib ntawm lub mortar, nws tuaj yeem cuam tshuam rau tag nrho cov txheej txheem hydration thiab pab txhawb kev txhim kho lub zog mus ntev.
6. Flexibility thiab tawg kuj:
Cov yeeb yaj kiab tsim los ntawm HPMC muab cov mortar yooj, ua rau nws tiv taus kev tawg. Qhov no muaj txiaj ntsig tshwj xeeb yog qhov kev txav ntawm cov txheej txheem yuav tshwm sim.
7. Kev ruaj ntseg nyob rau hauv hnyav hnyav:
HPMC muab cov mortars qhuav nrog kev ruaj ntseg nyob rau hauv ntau yam ntawm ib puag ncig, nrog rau raug rau huab cua hnyav. Nws txhim kho lub zuag qhia tag nrho durability thiab kev ua tau zoo ntawm mortar.
C. Daim ntawv thov:
1. Siv:
Tus nqi tsim nyog ntawm HPMC yog nyob ntawm cov kev cai tshwj xeeb ntawm cov tshuaj khib nyiab, suav nrog cov khoom xav tau thiab cov ntawv thov. Kev saib xyuas kom zoo thiab kev sim yog qhov tseem ceeb hauv kev txiav txim siab qhov koob tshuaj zoo tshaj plaws.
2. Compatibility:
HPMC yog sib xws nrog ntau yam ntawm lwm yam additives thiab cov khoom xyaw uas nquag siv nyob rau hauv qhuav mix mortar formulations. Txawm li cas los xij, kev ntsuas kev sib raug zoo yuav tsum tau ua kom ntseeg tau tias yuav tsum muaj kev ua tau zoo thiab zam kev cuam tshuam tsis zoo.
3. Cov qauv zoo:
Qhov zoo ntawm HPMC siv nyob rau hauv qhuav mix mortar yuav tsum ua raws li kev lag luam cov qauv thiab specifications. Ua raws li cov qauv zoo ua kom zoo ib yam thiab txhim khu kev qha mortar kev ua tau zoo.
nyob rau hauv xaus:
Hydroxypropyl methylcellulose (HPMC) yog cov khoom siv ntau yam ntxiv uas ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm cov khoom sib tov qhuav. Nws cov khoom sib xyaw tshwj xeeb, suav nrog kev tuav dej, txhim kho kev ua haujlwm thiab kev ua yeeb yaj kiab, ua rau nws yog ib feem tseem ceeb ntawm kev tsim kho niaj hnub. Raws li cov ntaub ntawv tsim kho txuas ntxiv mus, kev siv HPMC hauv cov txheej txheem qhuav-sib xyaw tuaj yeem pab txhim kho cov qauv ruaj khov, hloov tau yooj yim thiab ruaj khov.
Post lub sij hawm: Dec-18-2023