Hydroxypropyl methylcellulose (HPMC) yog ib qho tshuaj siv dav siv hauv cov khoom ntub dej sib tov. Cov cellulose ether compound no muaj cov khoom tshwj xeeb uas txhim kho kev ua haujlwm, ua haujlwm ntev thiab ua haujlwm ntawm mortars. Lub luag haujlwm tseem ceeb ntawm HPMC yog txhawm rau txhawm rau khaws dej thiab ua kom adhesion, yog li txhim kho lub peev xwm sib txuas ntawm mortar.
1. Txhim kho kev ua haujlwm
Lub workability ntawm ntub mix mortar hais txog nws lub peev xwm los ua tau yooj yim tuav thiab nchuav thaum siv. Qhov no yog ib qho cuab yeej tseem ceeb los xyuas kom meej tias lub mortar yog ib qho yooj yim rau kev sib tov, ncuav thiab daim ntawv. HPMC ua raws li cov yas yas yog li muab cov dej tuav thiab viscosity rau cov tshuaj khib. Nrog rau qhov sib ntxiv ntawm HPMC, lub mortar ua kom khov, tso cai rau nws ua raws thiab kev sib raug zoo.
Cov nyhuv ntawm HPMC ntawm mortar workability tuaj yeem raug ntaus nqi rau nws lub peev xwm los ua kom tuab thiab hloov cov rheology ntawm qhov sib tov. Los ntawm kev ua kom cov viscosity ntawm qhov sib tov, HPMC ua kom nws ntws zoo dua thiab txo cov kev nyiam sib cais lossis los ntshav. Kev txhim kho rheology ntawm cov sib tov kuj pab txo cov viscosity ntawm cov tshuaj khib, ua kom yooj yim rau kev ua hauj lwm nrog.
2. Ua kom cov dej khaws cia
Kev tuav dej yog ib qho tseem ceeb tshaj plaws ntawm cov khoom sib xyaw ntub dej. Nws yog hais txog lub peev xwm ntawm mortar kom khaws dej tau ntev. Lub mortar xav tau kev tuav dej txaus kom muaj zog thiab tiv thaiv kom tsis txhob shrinkage thiab tawg thaum ziab.
HPMC txhim kho cov dej khaws cia ntawm cov khoom ntub dej los ntawm kev tswj kev nqus thiab tso dej hauv qhov sib tov. Nws tsim ib zaj duab xis nyias nyob ib ncig ntawm cov cement hais, tiv thaiv lawv los ntawm absorbing dej ntau dhau thiab yog li tswj qhov sib xws ntawm qhov sib tov. Cov zaj duab xis kuj tseem pab kom qeeb cov evaporation ntawm cov dej hauv qhov sib tov, yog li ncua sij hawm ua hauj lwm ntawm cov mortar.
3. Ua kom adhesion
Adhesion yog lub peev xwm ntawm mortar rau daim ntawv cog lus thiab ua raws li lub substrate. Qhov no yog ib qho tseem ceeb hauv kev ua kom ntseeg tau tias cov mortar nyob twj ywm hauv qhov chaw thiab tsis cais tawm ntawm qhov chaw nws tau siv rau. HPMC txhim kho qhov adhesion ntawm ntub mix mortar los ntawm kev ua kom cov cohesiveness ntawm cov khoom sib tov, yog li txhim kho nws cov peev xwm sib txuas.
HPMC ua tiav qhov no los ntawm kev tsim cov yeeb yaj kiab nyias nyob ib ncig ntawm cov cement, uas pab txhim kho cov neeg kho tshuab lub zog ntawm cov mortar. Cov yeeb yaj kiab kuj ua raws li kev thaiv, tiv thaiv cov mortar los ntawm kev sib cais los ntawm substrate. Kev txhim kho mortar adhesion txhim kho cov durability thiab kev ntseeg siab ntawm kev tsim kho.
Hauv kev xaus
Qhov sib ntxiv ntawm HPMC rau ntub sib tov mortars muaj ob peb yam txiaj ntsig ntawm kev ua haujlwm, ua haujlwm ntev thiab ua haujlwm ntawm kev sib tov. Nws txhim kho cov dej tuav, kev ua haujlwm thiab kev ua kom zoo, ua rau cov mortar ntau cohesive, yooj yim los tuav thiab txhim khu kev qha. Cov khoom no ua rau HPMC ib qho tseem ceeb tshuaj ntxiv nyob rau hauv ntub mix mortar ntau lawm.
Post lub sij hawm: Sep-15-2023