Siv dav hauv kev tsim kho, Hydroxypropyl Methylcellulose (HPMC) yog ib qho tseem ceeb ntxiv rau hauv mortar. Nws txhim kho cov khoom xws li kev ua haujlwm, dej tuav thiab adhesion, yog li txhim kho kev ua haujlwm thiab kev ua haujlwm.
1. Nkag siab txog HPMC thiab nws cov txiaj ntsig
1.1 HPMC yog dab tsi?
HPMC yog ib qho nonionic cellulose ether muab los ntawm ntuj cellulose. Nws yog feem ntau siv rau hauv cov ntaub ntawv tsim kho, tshwj xeeb tshaj yog qhuav-sib tov mortars, vim nws muaj peev xwm hloov lub cev ntawm cov khoom sib tov.
1.2 Cov txiaj ntsig ntawm HPMC hauv Mortar
Kev tuav dej: HPMC txhim kho cov dej tuav, uas yog qhov tseem ceeb rau cov cement hydration, yog li txhim kho lub zog thiab txo qis.
Kev ua haujlwm tau zoo: Nws txhim kho kev ua haujlwm ntawm mortar, ua kom yooj yim rau kev thov thiab sib kis.
Adhesion: HPMC nce qhov adhesion ntawm mortar rau lub substrate, txo qhov kev pheej hmoo ntawm delamination.
Anti-Sag: Nws pab cov mortar tuav nws txoj hauj lwm ntawm ntsug nto yam tsis muaj sagging.
Lub Sijhawm Qhib Ntxiv: HPMC txuas ntxiv lub sijhawm qhib, tso cai rau ntau lub sijhawm rau kev hloov kho thiab ua tiav.
2. Hom HPMC thiab lawv cov teebmeem ntawm mortar
HPMC muaj nyob rau hauv ntau qib, sib txawv los ntawm viscosity thiab hloov qib:
Viscosity: High viscosity HPMC txhim kho cov dej tuav thiab ua haujlwm, tab sis ua rau sib tov nyuaj. Cov qib viscosity tsawg muaj cov dej tuav tsis zoo tab sis yooj yim dua sib xyaw.
Hloov pauv qib: Cov qib kev hloov pauv cuam tshuam rau solubility thiab thermal gel zog, uas ua rau muaj kev cuam tshuam rau kev ua haujlwm nyob rau hauv ib puag ncig sib txawv.
3. Cov lus qhia rau kev sib xyaw HPMC hmoov nrog mortar
3.1 Premixing xav
Compatibility: Xyuas kom tseeb tias qib HPMC xaiv tau sib xws nrog lwm cov tshuaj ntxiv thiab tag nrho cov qauv ntawm cov tshuaj khib nyiab.
Dosage: Hom HPMC ntau npaum li cas ntawm 0.1% mus rau 0.5% los ntawm qhov hnyav ntawm qhov sib tov qhuav. Kho raws li cov kev cai tshwj xeeb ntawm daim ntawv thov.
3.2 Mixing txheej txheem
Kev sib xyaw qhuav:
Sib tov cov khoom xyaw qhuav: Ua tib zoo sib xyaw HPMC hmoov nrog rau lwm cov khoom xyaw qhuav ntawm mortar (cement, xuab zeb, fillers) kom ntseeg tau tias txawm tias kev faib khoom.
Mechanical mixing: Siv lub tshuab agitator rau kev sib xyaw ua ke. Kev tuav sib xyaw yuav tsis ua tiav qhov xav tau sib xws.
Ntxiv dej:
Maj mam ntxiv: Ntxiv dej maj mam thaum sib tov kom tsis txhob clumping. Pib sib tov nrog me me dej thiab ces ntxiv ntxiv raws li xav tau.
Consistency Check: Saib xyuas qhov sib xws ntawm cov mortar kom ua tiav qhov kev xav tau ua haujlwm. Cov dej ntxiv yuav tsum tau tswj kom tsis txhob dhau-dilution, uas tuaj yeem ua rau cov sib tov tsis muaj zog.
Mixing Sijhawm:
Initial Mixing: Sib tov cov khoom rau 3-5 feeb kom txog thaum sib tov homogeneous.
Lub Sijhawm Sawv Cev: Cia qhov sib tov zaum ob peb feeb. Lub sijhawm sawv ntsug no pab txhawb HPMC kom ua tiav, ua kom nws ua tau zoo.
Kev Sib Tw Kawg: Sib tov dua rau 1-2 feeb ua ntej siv.
3.3 Daim ntawv qhia tswv yim
Kub thiab av noo: Kho cov ntsiab lus dej thiab sib tov lub sij hawm raws li qhov chaw nyob. Qhov kub thiab av noo tsawg yuav xav tau dej ntxiv lossis txo lub sijhawm qhib.
Tool Cleanliness: xyuas kom meej tias cov cuab yeej sib xyaw thiab cov ntim khoom huv si kom tsis txhob muaj kev sib kis thiab cov txiaj ntsig tsis sib xws.
4. Kev txiav txim siab thiab kev daws teeb meem
4.1 Kev tuav thiab khaws cia
Cia Lub Sijhawm: Khaws HPMC hmoov rau hauv qhov chaw txias, qhuav kom tsis txhob ya raws thiab clumping.
Txee Lub neej: Siv HPMC hmoov nyob rau hauv lub txee lub neej kom ntseeg tau tias kev ua tau zoo. Tshawb xyuas cov chaw tsim khoom cov txheej txheem rau cov lus pom zoo tshwj xeeb cia.
4.2 Cov teeb meem thiab kev daws teeb meem
Agglomeration: HPMC yuav clump yog tias dej ntxiv sai heev. Txhawm rau zam qhov no, nco ntsoov ntxiv dej maj mam thiab do tsis tu ncua.
Inconsistent Mixing: Mechanical mixing yog pom zoo rau kev faib khoom. Kev sib tov ntawm tes yuav ua rau muaj kev tsis sib haum xeeb.
Sagging: Yog tias sagging tshwm sim ntawm qhov chaw ntsug, xav txog kev siv qib siab dua HPMC qib lossis kho cov qauv los txhim kho thixotropy.
4.3 Kev txiav txim siab ib puag ncig
Temperature Effects: Kub siab dua ua kom qhov chaw thiab ziab ntawm cov tshuaj khib. Kho cov tshuaj HPMC lossis dej cov ntsiab lus kom haum.
Qhov cuam tshuam ntawm cov av noo: Cov av noo tsawg tuaj yeem ua rau cov evaporation nce ntxiv, yuav tsum tau hloov kho cov dej tuav tau los ntawm HPMC.
5. Cov lus qhia siab tshaj plaws rau kev ua kom muaj txiaj ntsig zoo
5.1 Sib tov nrog lwm yam additives
Kev Ntsuam Xyuas Kev Sib Raug Zoo: Thaum sib xyaw HPMC nrog lwm cov khoom siv ntxiv xws li cov khoom siv dej ntau, cov retarders, lossis cov accelerators, ua qhov kev sib tw.
Kev sib xyaw ua ke: Ntxiv HPMC thiab lwm yam tshuaj ntxiv rau hauv ib qho kev txiav txim tshwj xeeb kom tsis txhob muaj kev sib cuam tshuam uas yuav cuam tshuam rau kev ua haujlwm.
5.2 Optimize Dosage
Pilot: Ua qhov kev sim ntsuas los txiav txim siab qhov zoo tshaj plaws HPMC ntau npaum li cas rau ib qho kev sib tov sib xyaw.
Kho: Ua cov kev hloov kho raws li cov lus pom zoo los ntawm daim ntawv thov teb.
5.3 Txhim kho cov khoom tshwj xeeb
Rau kev ua haujlwm tau zoo: Xav txog kev sib xyaw HPMC nrog cov dej txo kom txhim kho kev ua haujlwm tsis muaj kev cuam tshuam lub zog.
Rau kev tuav dej: Yog tias yuav tsum tau kho cov dej kom ruaj khov hauv cov huab cua kub, siv cov qib viscosity siab dua ntawm HPMC.
Kev sib xyaw HPMC hmoov zoo rau hauv mortar tuaj yeem txhim kho cov tshuaj khib nyiab los ntawm kev txhim kho kev ua haujlwm, dej tuav, adhesion, thiab sag kuj. Kev nkag siab txog cov khoom ntawm HPMC thiab ua raws li cov txheej txheem sib xyaw kom zoo yog qhov tseem ceeb rau kev ua kom zoo dua ntawm cov mortar hauv kev tsim kho. Los ntawm kev xyuam xim rau hom HPMC siv, kev txiav txim siab ua ntej, thiab cov lus qhia siv tswv yim, koj tuaj yeem ua tiav qhov zoo, muaj txiaj ntsig mortar sib xyaw uas haum rau koj cov kev xav tau tshwj xeeb.
Post lub sij hawm: Jun-25-2024