Qhov tseem ceeb ntawm HPMC hauv kev khaws dej ntawm cov mortar

Hydroxypropyl methylcellulose (HPMC) yog ib qho tshuaj ntxiv uas siv dav hauv kev lag luam kev tsim kho, tshwj xeeb tshaj yog hauv cov mortar. Ua ib qho tshuaj molecular siab, HPMC muaj cov yam ntxwv uas ua rau nws ua tau zoo hauv kev khaws dej, ua kom tuab, ua kom lubrication, ruaj khov thiab txhim kho kev nplaum.

(1) Cov khoom siv tshuaj lom neeg thiab cov txheej txheem ua haujlwm ntawm HPMC

HPMC yog cov cellulose ether uas tsis yog ionic tau los ntawm kev hloov kho tshuaj ntawm cov cellulose ntuj. Cov hydroxypropyl thiab methyl pawg hauv nws cov qauv molecular ua rau nws solubility zoo thiab viscosity. Cov khoom siv tshuaj lom neeg no ua rau HPMC ua lub luag haujlwm tseem ceeb hauv cov mortar:

1.1 Kev ua tau zoo ntawm kev khaws dej

Qhov kev ua tau zoo ntawm HPMC feem ntau yog los ntawm cov pab pawg hydrophilic hauv nws cov qauv molecular. Cov pab pawg no tuaj yeem tsim cov hydrogen bonds nrog cov dej molecules, yog li ntawd nws thiaj li nqus tau thiab khaws cia dej tau zoo. Thaum lub sijhawm tsim cov mortar, HPMC tuaj yeem txo qhov evaporation ntawm dej, tswj cov dej noo hauv cov mortar, thiab xyuas kom meej tias cov tshuaj tiv thaiv hydration ntawm cement.

1.2 Cov nyhuv tuab

HPMC kuj tseem ua lub luag haujlwm ua kom cov mortar tuab. Cov kua nplaum uas tsim tom qab nws yaj tuaj yeem ua rau cov mortar sib xws, ua rau nws yooj yim dua rau kev tsim kho thiab duab. Qhov no tsis yog tsuas yog txhim kho kev ua tau zoo ntawm cov mortar, tab sis kuj txo qhov tshwm sim ntawm cov mortar sagging ntawm qhov chaw ntsug.

1.3 Cov nyhuv ntawm lubrication thiab stabilization

Qhov cuam tshuam ntawm HPMC ua rau cov mortar du thaum lub sijhawm sib tov thiab kev tsim kho, txo qhov nyuaj ntawm kev tsim kho. Tib lub sijhawm, HPMC muaj kev ruaj khov zoo, uas tuaj yeem txhim kho lub peev xwm tiv thaiv kev sib cais ntawm cov mortar thiab xyuas kom meej tias cov khoom mortar sib npaug. 

(2) Daim ntawv thov tshwj xeeb ntawm HPMC hauv kev khaws cia dej mortar

HPMC siv dav hauv ntau hom mortars, thiab nws cov dej tuav tau zoo muaj qhov tseem ceeb rau kev txhim kho kev ua haujlwm ntawm mortar. Cov hauv qab no yog cov ntawv thov tshwj xeeb ntawm HPMC hauv ntau hom mortars:

2.1 Cov cement mortar ib txwm muaj

Hauv cov cement mortar ib txwm muaj, cov dej khaws cia ntawm HPMC tuaj yeem tiv thaiv cov mortar kom tsis txhob poob dej sai dhau thaum lub sijhawm tsim kho, yog li zam qhov teeb meem ntawm cov mortar tawg thiab poob zog. Tshwj xeeb tshaj yog nyob rau hauv qhov kub thiab qhuav, kev ua tau zoo ntawm HPMC yog qhov tseem ceeb heev.

2.2 Cov tshuaj nplaum sib txuas

Hauv kev sib txuas ntawm cov tshuaj khib, qhov cuam tshuam ntawm HPMC tsis yog tsuas yog pab kom cov cement noo xwb, tab sis kuj txhim kho lub zog sib txuas ntawm cov tshuaj khib thiab cov khoom siv. Qhov no yog qhov tseem ceeb rau kev tsim cov khoom siv xws li cov vuas thiab pob zeb, thiab tuaj yeem tiv thaiv qhov tshwm sim ntawm kev tawg thiab poob.

2.3 Cov tshuaj nplaum uas siv tau rau tus kheej

Cov tshuaj mortar uas nws tus kheej leveling xav tau cov kua zoo thiab cov khoom uas nws tus kheej compacting. Cov teebmeem thickening thiab water retention ntawm HPMC tuaj yeem txhim kho kev ua haujlwm ntawm cov tshuaj mortar uas nws tus kheej leveling, kom ntseeg tau tias nws yuav tsis poob dej sai dhau thaum lub sijhawm ntws thiab nws tus kheej compacting, yog li ua kom ntseeg tau tias qhov zoo ntawm kev tsim kho.

2.4 Cov tshuaj nplaum rwb thaiv tsev

Cov pob zeb sib xyaw ua ke feem ntau ntxiv rau hauv cov tshuaj pleev thaiv hnub, uas ua rau kev ua haujlwm ntawm cov tshuaj pleev thaiv hnub tseem ceeb heev. Cov nyhuv ntawm HPMC tuaj yeem ua kom cov tshuaj pleev thaiv hnub tswj tau cov dej noo thaum lub sijhawm tsim kho thiab ua kom tawv, zam kev tawg thiab ntsws, thiab txhim kho cov nyhuv ntawm cov tshuaj pleev thaiv hnub thiab kev ua haujlwm ntev.

(3) Cov txiaj ntsig ntawm HPMC hauv kev khaws cia dej mortar

3.1 Txhim kho kev ua haujlwm ntawm kev tsim kho

Qhov cuam tshuam ntawm HPMC hauv cov mortar tuaj yeem txhim kho kev ua haujlwm ntawm cov mortar. Nws cov teebmeem thickening thiab lubricating ua rau mortar yooj yim dua rau kev siv thiab duab, txo qhov nyuaj thiab kev siv zog thaum lub sijhawm tsim kho. Tib lub sijhawm, qhov kev ua tau zoo ntawm HPMC tuaj yeem ncua lub sijhawm qhib ntawm mortar, muab sijhawm rau cov neeg ua haujlwm tsim kho ntau dua.

3.2 Txhim kho qhov zoo ntawm cov av nplaum

Qhov cuam tshuam ntawm HPMC uas khaws dej pab txhawb kev ua kom cov cement noo tag nrho, yog li ua kom lub zog thiab kev ruaj khov ntawm cov mortar zoo dua. Kev ua tau zoo ntawm kev khaws dej kuj tseem tuaj yeem tiv thaiv cov mortar kom tsis txhob tawg thiab ntsws thaum lub sijhawm ua kom tawv, ua kom ntseeg tau tias qhov zoo thiab qhov cuam tshuam ntawm kev tsim kho.

3.3 Kev txuag nqi

Kev siv HPMC tuaj yeem txo cov cement hauv cov mortar, yog li ntawd txo cov nqi tsim kho. Nws cov kev ua haujlwm khaws dej ua rau cov dej hauv mortar siv tau zoo dua, txo cov dej poob thiab pov tseg. Tib lub sijhawm, HPMC tuaj yeem txo qhov nrawm ntawm kev ua haujlwm dua ntawm cov mortar thaum lub sijhawm tsim kho, ntxiv txuag cov nqi.

Qhov tseem ceeb ntawm HPMC hauv kev khaws dej ntawm cov mortar yog qhov pom tseeb. Nws cov khoom siv tshuaj lom neeg tshwj xeeb thiab cov txheej txheem ua haujlwm ua rau nws ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev khaws dej, kev ua haujlwm ntawm kev tsim kho thiab qhov zoo ntawm cov mortar. Nrog rau kev txhim kho ntawm kev lag luam kev tsim kho, daim ntawv thov ntawm HPMC yuav dhau los ua ntau dua thiab tob dua, thiab txuas ntxiv pab txhawb rau kev txhim kho kev ua tau zoo thiab kev lees paub zoo ntawm cov mortar thiab lwm yam khoom siv tsim kho.