Kev siv cov hmoov txhuv nplej siab Ether hauv cov khoom siv cement-based

Cov hmoov txhuv nplej siab ether yog ib hom Hydroxypropyl starch ether uas yog siv dav hauv cov khoom siv cement xws li mortars, pob zeb, thiab grouts. Lub luag haujlwm tseem ceeb ntawm cov hmoov txhuv nplej siab ether hauv cov khoom no yog txhawm rau txhim kho lawv cov haujlwm ua haujlwm, tuav dej, thiab adhesion zog. Kev siv cov hmoov txhuv nplej siab ether hauv cov khoom siv cement tuaj yeem piav qhia raws li hauv qab no:

1. Kev ua haujlwm tau zoo: Starch ether tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom siv cement los ntawm kev txo lawv cov viscosity. Qhov no yog ua tiav los ntawm adsorption ntawm starch ether molecules mus rau saum npoo ntawm cov cement hais, uas txo lawv cov nqi hluav taws xob thiab ua kom lawv txav mus los. Qhov no tso cai rau cov cement hais kom txav tau yooj yim dua, ua rau muaj dej ntau dua thiab ua haujlwm yooj yim dua nrog kev sib tov.
2. Kev tuav dej: Cov hmoov txhuv nplej siab ether tuaj yeem txhim kho cov dej khaws cia ntawm cov khoom siv cement los ntawm kev tsim cov yeeb yaj kiab tiv thaiv ib puag ncig cov khoom cement. Cov yeeb yaj kiab no tiv thaiv cov dej hauv qhov sib tov los ntawm evaporating sai heev, cia cov khoom siv cement nyob twj ywm ua haujlwm tau ntev dua. Qhov no yog ib qho tseem ceeb tshwj xeeb tshaj yog nyob rau hauv kub thiab qhuav, qhov twg evaporation tus nqi ntawm cov dej los ntawm cov cement-based khoom yog siab.
3. Adhesion: Cov hmoov txhuv nplej siab ether tuaj yeem txhim kho qhov adhesion ntawm cov khoom cement-based rau substrate los ntawm kev ua kom lawv cov tackiness. Qhov no yog ua tiav los ntawm kev tsim cov hydrogen bonds ntawm cov hmoov txhuv nplej siab ether molecules thiab substrate nto, uas ua rau kom lub zog ntawm lub ntsej muag adhesion. Qhov no txhim kho tag nrho cov kev sib raug zoo ntawm cov khoom siv cement-based thiab substrate, txo qhov kev pheej hmoo ntawm kev tshem tawm lossis tsis ua haujlwm.
4. Crack tsis kam: Cov hmoov txhuv nplej siab ether tuaj yeem txhim kho qhov tawg tsis kam ntawm cov khoom siv cement los ntawm kev txhim kho lawv lub zog tensile. Qhov no yog ua tiav los ntawm kev tsim ntawm peb-dimensional network ntawm cov hmoov txhuv nplej siab ether molecules nyob rau hauv qhov sib tov, uas ua raws li kev txhawb nqa thiab pab faib cov tensile stresses ntau tus sib npaug. Qhov no tuaj yeem txhim kho tag nrho cov kav ntev thiab ntev ntawm cov khoom siv cement.

Hauv cov ntsiab lus, kev siv cov hmoov txhuv nplej siab ether hauv cov khoom siv cement tuaj yeem txhim kho lawv cov kev ua haujlwm, dej tuav, adhesion, thiab tawg tsis kam. Cov hmoov txhuv nplej siab ether ua tiav qhov no los ntawm kev txo cov viscosity ntawm cov khoom sib tov, tsim cov yeeb yaj kiab tiv thaiv ib ncig ntawm cov cement hais, ua kom cov tackiness ntawm cov khoom sib tov, thiab txhim kho lub zog tensile ntawm cov khoom. Kev siv cov hmoov txhuv nplej siab ether hauv cov khoom siv cement tuaj yeem txhim kho tag nrho cov kev ua tau zoo thiab ua haujlwm ntev ntawm cov khoom sib tov, ua rau muaj kev tsim kho kom zoo dua qub.