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

Hydroxypropyl methylcellulose (HPMC)yog cov dej-soluble polymer compound dav siv hauv kev tsim kho kev lag luam, tshwj xeeb tshaj yog nyob rau hauv cement-based mortar, gypsum-based mortar thiab pobzeb nplaum. Raws li cov tshuaj mortar additive, HPMC tuaj yeem txhim kho kev tsim kho kev ua haujlwm, txhim kho kev ua haujlwm, adhesion, dej tuav thiab tawg tsis kam ntawm mortar, yog li txhim kho tag nrho cov khoom zoo.

1. Cov khoom tseem ceeb ntawm HPMC

HPMC feem ntau tau txais los ntawm etherification hloov ntawm cellulose, thiab muaj dej solubility zoo, thickening, film-forming, lubrication thiab stability. Nws cov khoom tseem ceeb ntawm lub cev muaj xws li:

Dej solubility: Nws tuaj yeem yaj hauv dej txias lossis dej kub los tsim cov pob tshab los yog cov kua dej ntshiab.
Cov nyhuv Thickening: Nws tuaj yeem ua kom cov viscosity ntawm cov tshuaj thiab qhia cov nyhuv thickening zoo ntawm qhov tsis tshua muaj siab.
Kev tuav dej: HPMC tuaj yeem nqus dej thiab o, thiab ua lub luag haujlwm hauv kev tuav dej hauv cov mortar kom tsis txhob muaj dej poob sai heev.
Rheological zog: Nws muaj thixotropy zoo, uas pab txhim kho kev tsim kho ntawm mortar.

2. Lub luag haujlwm tseem ceeb ntawm HPMC hauv mortar

Lub luag haujlwm ntawm HPMC hauv mortar feem ntau yog tshwm sim hauv cov hauv qab no:

2.1 Txhim kho cov dej tuav ntawm mortar

Thaum lub sij hawm kev tsim kho ntawm cov cement mortar, yog tias cov dej evaporates sai dhau los yog nqus los ntawm lub hauv paus, nws yuav ua rau cov cement hydration tsis txaus thiab cuam tshuam rau kev txhim kho lub zog. HPMC tsim cov qauv mesh nyob rau hauv lub mortar los ntawm nws cov hydrophilicity thiab dej nqus thiab nthuav muaj peev xwm, locks nyob rau hauv noo noo, txo cov dej poob, yog li ncua lub sij hawm qhib ntawm lub mortar thiab txhim kho kev tsim kho adaptability.

2.2 Thickening nyhuv, txhim kho kev ua haujlwm ntawm mortar

HPMC muaj cov nyhuv thickening zoo, uas tuaj yeem ua kom cov viscosity ntawm cov mortar, ua kom cov mortar muaj cov yas zoo dua, thiab tiv thaiv cov mortar los ntawm kev sib cais, kev sib cais thiab cov dej los ntshav. Nyob rau tib lub sijhawm, cov thickening tsim nyog tuaj yeem txhim kho kev tsim kho ntawm cov mortar, ua kom yooj yim rau kev thov thiab theem thaum lub sij hawm tsim kho, thiab txhim kho kev tsim kho.

2.3 Txhim khu kev sib txuas thiab txhim kho qhov adhesion ntawm mortar

Nyob rau hauv daim ntawv thov xws li pobzeb nplaum, masonry mortar thiab plaster mortar, lub zog sib txuas ntawm lub mortar yog qhov tseem ceeb. HPMC tsim cov yeeb yaj kiab tsis sib xws ntawm lub hauv paus thiab txheej txheej los ntawm kev ua yeeb yaj kiab, uas txhim kho lub zog sib txuas ntawm cov tshuaj khib rau cov substrate, yog li txo qhov kev pheej hmoo ntawm mortar cracking thiab ntog.

2.4 Txhim kho kev tsim kho kev ua haujlwm thiab txo qis sag

Rau kev tsim kho qhov chaw ntsug (xws li phab ntsa plastering lossis pobzeb nplaum siv), cov mortar yog nquag sag los yog plam vim nws qhov hnyav. HPMC tsub kom cov txiaj ntsig kev ntxhov siab thiab tiv thaiv sag ntawm mortar, yog li cov mortar tuaj yeem ua tau zoo dua rau saum npoo ntawm lub hauv paus thaum siv ntsug, yog li txhim kho kev tsim kho kom ruaj khov.

2.5 Txhim khu kev ua kom tawg thiab txhim kho durability

Mortar yog qhov ua rau tawg vim yog shrinkage thaum lub sij hawm hardening txheej txheem, cuam tshuam rau qhov zoo ntawm qhov project. HPMC tuaj yeem kho qhov kev ntxhov siab sab hauv ntawm lub mortar thiab txo tus nqi shrinkage. Nyob rau tib lub sijhawm, los ntawm kev txhim kho qhov hloov pauv ntawm cov mortar, nws muaj kev sib tsoo zoo dua nyob rau hauv kev hloov pauv kub lossis kev ntxhov siab sab nraud, yog li txhim kho cov kav ntev.

2.6 Muaj feem xyuam rau lub sijhawm teeb tsa ntawm mortar

HPMC cuam tshuam rau lub sijhawm teeb tsa ntawm mortar los ntawm kev kho qhov ceev ntawm cov cement hydration cov tshuaj tiv thaiv. Tus nqi tsim nyog ntawm HPMC tuaj yeem txuas ntxiv lub sijhawm tsim kho ntawm mortar thiab ua kom lub sijhawm hloov kho txaus thaum lub sijhawm tsim kho, tab sis kev siv ntau dhau tuaj yeem ncua sijhawm teem sijhawm thiab cuam tshuam rau qhov kev ua tiav ntawm qhov project, yog li kev siv ntau npaum li cas yuav tsum tau tswj kom tsim nyog.

3. Cov nyhuv ntawm HPMC ntau npaum li cas rau kev ua haujlwm ntawm mortar

Qhov ntau npaum ntawm HPMC hauv mortar feem ntau yog qis, feem ntau ntawm 0.1% thiab 0.5%. Qhov tshwj xeeb npaum li cas yog nyob ntawm hom mortar thiab kev tsim kho:

Tsawg npaum li cas (≤0.1%): Nws tuaj yeem txhim kho cov dej tuav thiab txhim kho me ntsis kev ua haujlwm ntawm mortar, tab sis cov nyhuv thickening tsis muaj zog.

Medium dosage (0.1% ~ 0.3%): Nws txhim kho cov dej tuav, adhesion thiab anti-sagging peev xwm ntawm mortar thiab txhim kho kev tsim kho.

Kev siv ntau ntau (≥0.3%): Nws yuav ua rau kom cov viscosity ntawm mortar, tab sis tuaj yeem cuam tshuam rau cov dej ntws, ncua sij hawm teeb tsa, thiab tsis zoo rau kev tsim kho.

Raws li ib qho tseem ceeb additive rau mortar,HPMCplays lub luag haujlwm tseem ceeb hauv kev txhim kho dej tuav, txhim kho kev tsim kho, txhim kho adhesion thiab tawg tsis kam. Qhov tsim nyog ntxiv ntawm HPMC tuaj yeem txhim kho qhov kev ua tau zoo tag nrho ntawm mortar thiab txhim kho qhov zoo ntawm qhov project. Nyob rau tib lub sijhawm, qhov ntau npaum li cas yuav tsum tau tswj kom tsis txhob muaj kev cuam tshuam tsis zoo ntawm kev teeb tsa lub sijhawm thiab kev tsim kho fluidity. Nyob rau yav tom ntej, nrog rau kev txhim kho txuas ntxiv ntawm kev tsim kho kev lag luam, daim ntawv thov kev cia siab ntawm HPMC hauv cov khoom siv tshiab ntsuab yuav nthuav dav dua.