Kev tuav dej thiab txoj cai ntawm HPMC cellulose ether

Ib qho ntawm cov haujlwm tseem ceeb ntawm hydroxypropylmethylcellulose (HPMC) cellulose ethers yog ua cov thickener thiab stabilizer hauv cov khoom siv, khoom noj khoom haus thiab cov khoom tu tus kheej. Txawm li cas los xij, nws tseem ua lub luag haujlwm tseem ceeb hauv kev txhim kho dej tuav hauv ntau daim ntawv thov, suav nrog cov nplais nplaum, grouts thiab cement-based mortars.

Kev tuav dej yog txhais tau tias yog lub peev xwm ntawm cov khoom khaws cia lossis khaws cov dej ntxiv. Thaum cov khoom tsis tuav dej, nws tuaj yeem ua rau qhuav lossis tawg, uas cuam tshuam nws qhov kev ua tau zoo tag nrho.

Lub hauv paus ntsiab lus ntawm HPMC cellulose ether los txhim kho cov dej tuav yog nyob ntawm nws cov qauv molecular tshwj xeeb. HPMC cellulose ether yog polysaccharide polymer tsim los ntawm cov piam thaj txuas los ntawm β-(1,4)-glycosidic bonds. Nws kuj muaj hydroxypropyl thiab methyl sab pawg, uas muab cov dej solubility thiab dej tuav cov khoom.

Thaum HPMC cellulose ether ntxiv rau cov cement-based mortar, nws pawg hydroxypropyl yuav adsorbed rau saum npoo ntawm cov cement hais. Qhov no tsim ib txheej dej nyob ib ncig ntawm cov pellets, tiv thaiv lawv kom qhuav sai heev. Nyob rau tib lub sijhawm, pawg methyl muab steric hindrance, tiv thaiv cov cement hais los ntawm kev khi nruj heev thiab tsim cov matrix ntom. Qhov no tso cai rau dej kom yooj yim dua faib thoob plaws hauv lub mortar, txhim kho nws txoj haujlwm, sib xws thiab kev ua tau zoo tag nrho.

Kev tuav dej tuaj yeem ntsuas tau siv ntau txoj hauv kev, suav nrog kev ntsuas nqus thiab ntsuas centrifugation. Kev ntsuas suction ntsuas cov dej uas cov khoom muaj peev xwm tuav tau tom qab raug lub tshuab nqus tsev. Kev ntsuas centrifuge ntsuas cov dej ntau npaum li cas cov khoom tuaj yeem khaws tau tom qab raug quab yuam centrifugal. Cov kev ntsuam xyuas no pab txiav txim siab qhov ua tau zoo ntawm HPMC cellulose ethers hauv kev txhim kho dej tuav hauv cov ntawv thov tshwj xeeb.

Ntxiv nrog rau kev txhim kho dej tuav, HPMC cellulose ethers muab lwm cov txiaj ntsig hauv cov khoom siv thiab lwm yam kev siv. Nws txhim kho cov adhesion thiab txo cov sagging ntawm cov nplais nplaum, txhim kho kev ua haujlwm thiab kev sib raug zoo ntawm cov cement-based mortars, thiab txhim kho rheology thiab stability ntawm cov xim thiab txheej.

Hauv cov ntsiab lus, HPMC cellulose ethers ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov dej tuav hauv tsev thiab ntau yam kev siv. Nws cov qauv molecular tshwj xeeb thiab cov yam ntxwv ntawm cov dej solubility ua rau nws muaj txiaj ntsig zoo khaws dej ntxiv, nqa ntau cov txiaj ntsig rau kev ua haujlwm ntawm cov khoom kawg.