Kev siv ntawm hydroxypropyl methylcellulose hauv mortar

1. Kev tuav dej

Hydroxypropyl methylcellulose rau kev tsim kho kom tsis txhob ya raws los ntawm kev nkag mus rau hauv phab ntsa. Cov dej tsim nyog nyob twj ywm hauv cov mortar, kom cov cement muaj sij hawm ntev dua los hydrate. Cov dej tuav yog proportional rau viscosity ntawm cellulose ether tov nyob rau hauv lub mortar. Qhov siab dua qhov viscosity, qhov dej tuav tau zoo dua. Thaum cov dej molecules nce, cov dej tuav tau qis. Vim hais tias rau tib tus nqi ntawm kev tsim kho tshwj xeeb hydroxypropyl methylcellulose tov, qhov nce ntawm cov dej txhais tau tias txo qis hauv viscosity. Kev txhim kho ntawm kev tuav dej yuav ua rau ncua sij hawm kho ntawm lub mortar tau tsim.

2. Txhim kho kev tsim kho

Daim ntawv thov ntawm hydroxypropyl methylcellulose HPMC tuaj yeem txhim kho kev tsim kho ntawm mortar, ua rau cov khoom mortar muaj kev sib kis tau zoo dua, txo cov adhesion rau cov cuab yeej, ua rau kev tsim kho yooj yim dua, thiab txo cov neeg ua haujlwm lub cev.

3. Cov ntsiab lus npuas

Cov huab cua npuas cov ntsiab lus ua rau zoo dua mortar tawm los thiab ua haujlwm tau zoo, txo qis kev tawg. Nws kuj txo qis tus nqi siv, ua rau "liquefaction" tshwm sim. Cov ntsiab lus ntawm huab cua npuas feem ntau yog nyob ntawm lub sijhawm nplawm. Cov khoom siv dav siv los txhim kho kev ua haujlwm ntawm cov khoom siv hydraulic, xws li cov cement thiab gypsum. Hauv cov cement-based mortars, nws txhim kho cov dej tuav, nce kev kho thiab qhib lub sijhawm, thiab txo qis sagging.

4. Anti-sagging

Ib qho zoo sag-resistant mortar txhais tau hais tias thaum siv rau hauv cov khaubncaws sab nraud povtseg, tsis muaj kev phom sij ntawm sag lossis downward flow. Sag kuj tuaj yeem txhim kho los ntawm kev tsim kho tshwj xeeb hydroxypropyl methylcellulose. Tshwj xeeb tshaj yog cov tsim tshiab hydroxypropyl methylcellulose rau kev tsim kho tuaj yeem muab cov khoom zoo dua los tiv thaiv sagging ntawm mortar.

5. Muaj peev xwm ntub dej

Cov khoom tsim nyog cellulose ether tuaj yeem txhim kho qhov viscosity ntawm mortar thaum ua kom lub ntsej muag ua haujlwm thiab ntub adhesion ntawm mortar, uas ua rau cov mortar muaj kev ua tau zoo dua hauv kev ntub dej ntawm cov substrate, txawm tias nws yog siv rau EPS lossis XPS, thiab lwm yam. tsis muaj curling thiab tsis-wetting tshwm sim ntawm qhov tshwj xeeb puag nto.