Hydroxypropyl methylcellulose (HPMC) yog ib qho khoom siv ntxiv uas siv dav hauv kev lag luam kev tsim kho, tshwj xeeb tshaj yog rau cov khoom siv cement. Nws cov yam ntxwv tshwj xeeb ua rau nws yog ib qho tseem ceeb hauv ntau yam kev siv, los ntawm kev txhim kho kev ua haujlwm mus rau kev txhim kho kev ua haujlwm thiab kev ruaj khov ntawm cov pob zeb thiab cov mortars.
1. Kev txhais thiab kev piav qhia txog hydroxypropyl methylcellulose
Hydroxypropyl methylcellulose, feem ntau hu ua HPMC, yog ib qho polymer ua los ntawm cellulose uas tau los ntawm cov ntoo pulp lossis paj rwb. Nws yog ib qho khoom siv ntau yam nrog cov yam ntxwv tshwj xeeb ntawm rheology, adhesion thiab khaws dej. Thaum ntxiv rau cov khoom siv cement, HPMC ua haujlwm ua tus neeg sawv cev ntau yam, cuam tshuam rau cov khoom tshiab thiab tawv ntawm cov khoom sib tov.
2. Cov yam ntxwv tshiab ntawm cov ntaub ntawv ua los ntawm cement: kev ua haujlwm tau zoo thiab kev hloov pauv ntawm cov khoom
Ib qho ntawm lub luag haujlwm tseem ceeb ntawm HPMC hauv cov ntaub ntawv ua los ntawm cement yog los txhim kho kev ua haujlwm tau zoo. Kev ntxiv HPMC txhim kho cov khoom rheological ntawm cov khoom sib tov, ua rau muaj kev ntws zoo dua thiab yooj yim ntawm kev tso. Qhov no tseem ceeb heev rau hauv cov ntawv thov xws li kev tso cov pob zeb thiab cov ntawv thov mortar, qhov twg kev ua haujlwm tau zoo yog qhov tseem ceeb.
3. Kev khaws dej
HPMC ua haujlwm ua tus neeg sawv cev khaws dej, tiv thaiv kev poob dej ntau dhau los ntawm cov khoom siv cementitious thaum ntxov ntawm kev kho. Qhov kev khaws dej zoo dua no pab tswj cov dej noo zoo tshaj plaws rau cov khoom cement, txhawb kev txhim kho lub zog thiab kev ruaj khov.
4. Cov khoom ua kom tawv, lub zog thiab kev ruaj khov ntawm cov ntaub ntawv ua los ntawm cement
Qhov cuam tshuam ntawm HPMC rau cov khoom tawv ntawm cov khoom siv cement yog qhov tseem ceeb. HPMC pab ua kom lub zog compressive ntawm cov pob zeb los ntawm kev txhim kho kev ua haujlwm thiab kev khaws dej hauv lub xeev tshiab. Tsis tas li ntawd, cov txheej txheem hydration zoo dua ua rau muaj cov qauv me me, uas ua rau cov khoom siv ruaj khov thiab tiv taus cov yam ntxwv ib puag ncig xws li cov voj voog khov-thaw thiab kev tawm tsam tshuaj lom neeg.
5. Txo qhov ntsws
Cov ntaub ntawv ua los ntawm cement feem ntau yuav ntsws thaum lub sijhawm kho, ua rau muaj kab nrib pleb. HPMC txo qhov teeb meem no los ntawm kev txo qhov xav tau dej ntawm qhov sib tov, yog li txo qhov muaj peev xwm rau kab nrib pleb ntsws. Cov dej tswj tau uas HPMC txhawb nqa pab tswj qhov ruaj khov ntawm cov ntaub ntawv tawv.
6. Cov khoom nplaum thiab cov khoom nplaum
HPMC pab txhim kho cov khoom sib txuas ntawm cov ntaub ntawv cement thiab txhim kho qhov sib txuas ntawm cov ntaub ntawv thiab ntau yam substrates. Qhov no tseem ceeb heev rau cov ntawv thov xws li cov nplaum pobzeb thiab plasters, qhov twg cov kev sib txuas muaj zog yog qhov tseem ceeb rau lub neej ntev thiab kev ua haujlwm ntawm lub tsev.
7. Txhim kho kev sib koom ua ke
Ntxiv rau kev txhim kho kev nplaum, HPMC kuj tseem tuaj yeem txhim kho kev sib koom ua ke ntawm cov khoom nws tus kheej. Qhov no yog qhov zoo uas cov ntaub ntawv cement-based yuav tsum tau lo rau ntawm cov nto ntsug lossis tswj lawv cov duab thaum lub sijhawm thov.
8. Cov Teeb Meem thiab Kev Xav Txog Kev Noj Tshuaj thiab Kev Sib Xws
Txawm hais tias HPMC muaj ntau yam zoo, nws qhov ua tau zoo nyob ntawm qhov ntau npaum li cas. Kev siv ntau dhau lossis siv tsis raug ntawm HPMC yuav ua rau muaj kev phiv xws li lub sijhawm teeb tsa qeeb lossis lub zog txo qis. Tsis tas li ntawd, kev sib raug zoo nrog lwm cov khoom ntxiv thiab cov khoom sib xyaw yuav tsum tau txiav txim siab kom ntseeg tau tias muaj kev ua tau zoo tshaj plaws hauv ib daim ntawv thov tshwj xeeb.
9. Kev cuam tshuam rau ib puag ncig
Qhov cuam tshuam rau ib puag ncig ntawm kev siv HPMC hauv cov ntaub ntawv tsim kho yog qhov kev txhawj xeeb loj hlob. Txawm hais tias HPMC nws tus kheej yog biodegradable, qhov kev ruaj khov tag nrho ntawm nws cov khoom tsim thiab kev siv yuav tsum tau xav txog. Cov kws tshawb fawb thiab cov kws tshaj lij hauv kev lag luam tab tom tshawb nrhiav lwm cov khoom siv ntxiv uas zoo rau ib puag ncig uas tuaj yeem muab cov txiaj ntsig zoo sib xws yam tsis muaj qhov tsis zoo ntawm ib puag ncig.
xaus lus
Hauv kev xaus lus, hydroxypropyl methylcellulose ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua tau zoo ntawm cov ntaub ntawv cement. Txij li kev txhim kho kev ua haujlwm thiab kev khaws cia dej hauv lub xeev tshiab mus rau kev nce lub zog, kev ruaj khov thiab kev nplaum hauv lub xeev khov kho, HPMC pab txhim kho qhov zoo ntawm cov ntaub ntawv tsim kho. Txawm li cas los xij, kom paub txog tag nrho lub peev xwm ntawm HPMC thaum ua kom muaj kev tsim kho kom ruaj khov, kev noj tshuaj, kev sib raug zoo thiab kev cuam tshuam rau ib puag ncig yuav tsum tau xav txog zoo. Raws li kev lag luam tsim kho txuas ntxiv mus, kev tshawb fawb thiab kev txhim kho txuas ntxiv tuaj yeem ua rau muaj kev tsim kho tshiab hauv cov thev naus laus zis ntxiv, muab cov kev daws teeb meem zoo dua rau cov teeb meem uas kev tsim kho niaj hnub ntsib.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-12-2023