Lub hauv paus ntsiab lus ua haujlwm ntawm hydroxypropyl methylcellulose hauv mortar

Hydroxypropyl methylcellulose (HPMC)yog ib qho polymer sib xyaw ua ke uas yaj tau hauv dej uas siv dav hauv kev lag luam kev tsim kho, tshwj xeeb tshaj yog hauv cov cement-based mortar, gypsum-based mortar thiab cov nplaum pobzeb. Ua ib qho khoom siv ntxiv rau mortar, HPMC tuaj yeem txhim kho kev ua haujlwm ntawm kev tsim kho, txhim kho kev ua haujlwm, kev nplaum, kev khaws dej thiab kev tawg ntawm cov mortar, yog li ua kom zoo dua qhov zoo ntawm cov mortar.

1. Cov khoom tseem ceeb ntawm HPMC

HPMC feem ntau yog tau los ntawm kev hloov kho etherification ntawm cellulose, thiab muaj cov dej zoo solubility, thickening, zaj duab xis-tsim, lubricity thiab stability. Nws cov khoom tseem ceeb lub cev muaj xws li:

Kev yaj dej: Nws tuaj yeem yaj rau hauv dej txias lossis dej kub kom tsim tau cov kua nplaum pob tshab lossis pob tshab.
Cov nyhuv thickening: Nws tuaj yeem ua rau kom cov viscosity ntawm cov tshuaj ntau ntxiv thiab qhia cov nyhuv thickening zoo ntawm cov concentration qis.
Kev khaws dej: HPMC tuaj yeem nqus dej thiab o, thiab ua lub luag haujlwm hauv kev khaws dej hauv cov mortar kom tiv thaiv dej kom tsis txhob poob sai dhau.
Cov khoom rheological: Nws muaj thixotropy zoo, uas pab txhim kho kev ua haujlwm ntawm cov mortar.

2. Lub luag haujlwm tseem ceeb ntawm HPMC hauv mortar

Lub luag haujlwm ntawm HPMC hauv mortar yog feem ntau pom tseeb hauv cov hauv qab no:

2.1 Txhim kho qhov kev khaws dej ntawm cov mortar

Thaum lub sijhawm tsim cov cement mortar, yog tias cov dej ua pa sai dhau lossis lub hauv paus nqus tau ntau dhau, nws yuav ua rau cov cement hydration tsis txaus thiab cuam tshuam rau kev txhim kho lub zog. HPMC tsim cov qauv mesh sib xws hauv cov mortar los ntawm nws cov hydrophilicity thiab dej nqus thiab nthuav dav muaj peev xwm, xauv cov dej noo, txo cov dej poob, yog li ntawd ntev lub sijhawm qhib ntawm cov mortar thiab txhim kho kev hloov pauv hauv kev tsim kho.

2.2 Cov nyhuv ua kom tuab, txhim kho kev ua haujlwm ntawm cov mortar

HPMC muaj cov nyhuv thickening zoo, uas tuaj yeem ua rau kom cov mortar viscosity ntau ntxiv, ua rau cov mortar muaj plasticity zoo dua, thiab tiv thaiv cov mortar los ntawm stratification, sib cais thiab dej ntws. Tib lub sijhawm, thickening tsim nyog tuaj yeem txhim kho kev tsim kho ntawm cov mortar, ua rau nws yooj yim dua rau kev thov thiab theem thaum lub sijhawm tsim kho, thiab txhim kho kev tsim kho kom zoo.

2.3 Txhim kho kev sib txuas thiab txhim kho kev sib txuas ntawm cov mortar

Hauv cov ntawv thov xws li cov nplaum pobzeb, cov pob zeb masonry thiab cov pob zeb plaster, lub zog sib txuas ntawm cov pob zeb mortar yog qhov tseem ceeb heev. HPMC tsim cov zaj duab xis polymer sib xws ntawm lub hauv paus thiab txheej los ntawm kev ua yeeb yaj kiab, uas txhim kho lub zog sib txuas ntawm cov pob zeb mortar rau lub substrate, yog li txo qhov kev pheej hmoo ntawm cov pob zeb mortar tawg thiab poob tawm.

2.4 Txhim kho kev ua haujlwm ntawm kev tsim kho thiab txo qhov sag

Rau kev tsim kho qhov chaw ntsug (xws li kev pleev phab ntsa lossis kev tsim cov nplais nplaum), cov mortar yuav yooj yim sag lossis plam vim nws qhov hnyav. HPMC ua rau muaj kev ntxhov siab thiab tiv thaiv kev sag ntawm cov mortar, yog li cov mortar tuaj yeem lo rau ntawm qhov chaw ntawm lub hauv paus thaum lub sijhawm tsim kho ntsug, yog li txhim kho kev ruaj khov ntawm kev tsim kho.

2.5 Txhim kho qhov tawg thiab txhim kho durability

Cov tshuaj mortar feem ntau yuav tawg vim yog qhov ntsws thaum lub sijhawm ua kom tawv, uas cuam tshuam rau qhov zoo ntawm qhov project. HPMC tuaj yeem kho qhov kev ntxhov siab sab hauv ntawm cov tshuaj mortar thiab txo qhov nrawm ntawm qhov ntsws. Tib lub sijhawm, los ntawm kev txhim kho qhov yooj ywm ntawm cov tshuaj mortar, nws muaj kev tiv thaiv kab nrib pleb zoo dua nyob rau hauv qhov kub thiab txias lossis kev ntxhov siab sab nraud, yog li txhim kho kev ruaj khov.

2.6 Cuam tshuam rau lub sijhawm teeb tsa ntawm cov mortar

HPMC cuam tshuam rau lub sijhawm teeb tsa ntawm cov mortar los ntawm kev kho qhov ceev ntawm cov cement hydration reaction. Ib qho ntau ntawm HPMC tuaj yeem ncua lub sijhawm tsim kho ntawm cov mortar thiab xyuas kom muaj lub sijhawm hloov kho txaus thaum lub sijhawm tsim kho, tab sis kev siv ntau dhau tuaj yeem ncua lub sijhawm teeb tsa thiab cuam tshuam rau kev nce qib ntawm qhov project, yog li cov tshuaj yuav tsum tau tswj hwm kom zoo.

3. Cov nyhuv ntawm HPMC koob tshuaj rau kev ua haujlwm ntawm cov mortar

Cov koob tshuaj ntawm HPMC hauv cov tshuaj khib feem ntau yog qis, feem ntau ntawm 0.1% thiab 0.5%. Cov koob tshuaj tshwj xeeb nyob ntawm hom tshuaj khib thiab kev tsim kho.:

Cov tshuaj tsawg (≤0.1%): Nws tuaj yeem txhim kho kev khaws dej thiab txhim kho me ntsis kev ua haujlwm ntawm cov tshuaj khib, tab sis qhov cuam tshuam ntawm cov tuab tsis muaj zog.

Qhov nruab nrab koob tshuaj (0.1% ~ 0.3%): Nws txhim kho qhov kev tuav dej, kev nplaum thiab kev tiv thaiv kev sagging ntawm cov mortar thiab txhim kho kev ua haujlwm ntawm kev tsim kho.

Kev siv tshuaj ntau (≥0.3%): Nws yuav ua rau cov mortar viscosity ntau ntxiv, tab sis nws yuav cuam tshuam rau kev fluidity, ncua sijhawm teeb tsa, thiab tsis zoo rau kev tsim kho.

Ua ib qho khoom siv tseem ceeb rau mortar,HPMCua lub luag haujlwm tseem ceeb hauv kev txhim kho kev khaws dej, txhim kho kev ua haujlwm ntawm kev tsim kho, txhim kho kev nplaum thiab kev tiv thaiv tawg. Kev ntxiv HPMC kom tsim nyog tuaj yeem txhim kho kev ua haujlwm tag nrho ntawm cov mortar thiab txhim kho qhov zoo ntawm qhov project. Tib lub sijhawm, qhov ntau npaum li cas yuav tsum tau tswj hwm kom tsis txhob muaj kev cuam tshuam tsis zoo rau lub sijhawm teeb tsa thiab kev ua haujlwm ntawm kev tsim kho. Yav tom ntej, nrog rau kev txhim kho tas mus li ntawm kev lag luam kev tsim kho, kev cia siab ntawm daim ntawv thov HPMC hauv cov ntaub ntawv tsim kho tshiab yuav dav dua.