Nyob rau hauv lub ntiaj teb no ntawm cov tshuaj, muaj ntau lub tebchaw uas muaj cov khoom zoo sib xws tab sis txawv nyob rau hauv lawv daim ntawv thov. Ib qho piv txwv yog hydroxypropyl methylcellulose (HPMC) thiab hydroxyethyl cellulose (HEC). Ob lub cellulose derivatives no tau siv dav hauv ntau qhov kev lag luam, tab sis kev nkag siab txog lawv cov khoom tshwj xeeb yog qhov tseem ceeb rau kev xaiv qhov tsim nyog derivative rau ib daim ntawv thov tshwj xeeb.
Hydroxypropyl methylcellulose, feem ntau hu ua HPMC, yog cov khoom siv hluavtaws ntawm cellulose. Nws tau txais los ntawm kev kho cov cellulose ntuj nrog propylene oxide thiab methyl chloride, thiab qhia hydroxypropyl thiab methyl pawg raws li. Qhov kev hloov kho no txhim kho cov dej solubility ntawm cellulose thiab txhim kho nws tag nrho cov khoom. Ntawm qhov tod tes, hydroxyethyl cellulose (HEC) kuj yog cellulose derivative tau los ntawm cov tshuaj tiv thaiv ntawm ntuj cellulose thiab ethylene oxide. Kev taw qhia ntawm cov pab pawg hydroxyethyl ua rau muaj dej solubility thiab thickening zog.
Ib qho ntawm qhov sib txawv tseem ceeb ntawm HPMC thiab HEC yog lawv qhov chaw thov. HPMC muaj ntau yam kev siv hauv kev tsim kho kev lag luam. Nws yog dav siv los ua cov thickener hauv cov khoom siv cement xws li pobzeb adhesives, qhuav mix mortars thiab self-leveling compounds. Vim nws cov khoom tuav dej, HPMC txhim kho kev ua haujlwm, adhesion thiab durability ntawm cov khoom siv hauv tsev. Tsis tas li ntawd, HPMC yog siv los ua tus neeg sawv cev ua yeeb yaj kiab hauv cov txheej txheem thiab cov xim, muab cov dej tsis zoo thiab gloss.
HEC, ntawm qhov tod tes, feem ntau yog siv hauv kev saib xyuas tus kheej thiab tshuaj pleev ib ce. Nws yog siv los ua cov thickener, emulsifier thiab stabilizer hauv cov tshuaj pleev, tshuaj pleev, tshuaj zawv plaub hau thiab lwm yam khoom zoo nkauj. HEC txhim kho cov viscosity ntawm cov qauv no, ua rau muaj kev ntxhib los mos zoo dua, nthuav dav thiab tag nrho cov khoom ua tau zoo. Nws lub peev xwm ua yeeb yaj kiab kuj ua rau nws muaj cov khoom zoo tshaj plaws hauv cov plaub hau gels thiab mousses, muab kev tuav ntev ntev yam tsis muaj nplaum.
Lwm qhov sib txawv tseem ceeb yog qhov viscosity ntau ntawm cov tebchaw no. HPMC feem ntau muaj viscosity siab dua HEC. Qhov sib txawv viscosity no ua rau HEC tsim nyog rau cov ntawv thov uas xav tau qis rau nruab nrab thickening kev ua haujlwm. HEC muab kev ruaj ntseg zoo heev thiab kev tswj cov dej ntws hauv cov kua dej, kom ntseeg tau tias kev faib tawm ntawm cov khoom xyaw nquag. HPMC lub viscosity siab dua, ntawm qhov tod tes, ua rau nws haum rau cov ntawv thov uas xav tau nruab nrab mus rau siab tuab, xws li cov khoom siv.
Tsis tas li ntawd, HPMC thiab HEC sib txawv hauv lawv qhov sib xws nrog lwm cov khoom xyaw tshuaj. HPMC muaj kev sib raug zoo nrog ntau yam khoom siv ntxiv thiab ua siab ntev rau cov ntsev thiab cov surfactants, ua rau nws muaj ntau yam hauv ntau hom kev tsim. HEC, thaum feem ntau sib xws nrog cov khoom xyaw feem ntau, tej zaum yuav muaj qee qhov teeb meem sib xws nrog qee cov ntsev, acids, thiab surfactants. Yog li ntawd, thaum xaiv ntawm HPMC thiab HEC, nws yog ib qho tseem ceeb uas yuav tau txiav txim siab txog kev sib haum xeeb ntawm ib qho kev tsim tshwj xeeb.
Hauv cov ntsiab lus, HPMC thiab HEC, raws li cellulose derivatives, muaj lawv cov khoom tshwj xeeb thiab kev siv. Nkag siab qhov sib txawv ntawm cov tebchaw no yog qhov tseem ceeb rau kev xaiv cov khoom sib xyaw tsim nyog rau ib daim ntawv thov tshwj xeeb. HPMC yog dav siv nyob rau hauv kev tsim kho kev lag luam raws li ib tug thickener thiab zaj duab xis-tsim tus neeg saib xyuas, thaum HEC yog tsuas yog siv nyob rau hauv cov khoom tu tus kheej raws li ib tug thickener thiab stabilizer. Los ntawm kev xav txog cov kev xav tau viscosity thiab kev sib raug zoo nrog lwm cov khoom xyaw, cov khoom tsim nyog tshaj plaws ntawm cellulose tuaj yeem raug xaiv, kom ntseeg tau tias kev ua tau zoo thiab cov txiaj ntsig xav tau hauv cov khoom kawg.
Ua tsaug rau koj txoj kev koom tes nrog JINJI CHEMICAL.
Post lub sij hawm: Nov-14-2023