Muaj qee qhov kev sib raug zoo ntawm cov hmoov zoo ntawm cov hmoov putty thiab HPMC (hydroxypropyl methylcellulose), tab sis cov haujlwm thiab cov teebmeem ntawm ob qhov sib txawv.
1. Muaj pes tsawg leeg thiab hmoov yam ntxwv ntawm putty hmoov
Putty hmoov yog cov khoom siv hauv tsev siv rau phab ntsa theem, kho thiab kho kom zoo nkauj. Cov khoom tseem ceeb muaj xws li cov khoom siv hauv paus (xws li cov cement, gypsum), cov khoom ntim (xws li calcium carbonate) thiab cov khoom ntxiv (xws li cellulose ether, dej tuav tus neeg saib xyuas, thiab lwm yam). Cov hmoov zoo ntawm cov hmoov putty feem ntau yog hais txog qhov zoo, qhov sib xws thiab kev xav ntawm nws cov khoom thaum siv. Cov hmoov zoo no cuam tshuam los ntawm cov hauv qab no:
Particle loj ntawm muab tub lim: Calcium carbonate feem ntau yog siv los ua lub ntsiab muab tub lim. Qhov zoo dua cov calcium carbonate, qhov zoo dua cov hmoov zoo ntawm cov hmoov putty, thiab qhov zoo dua qhov flatness thiab smoothness ntawm phab ntsa tom qab thov.
Hom ntawm cov khoom siv hauv paus: Piv txwv li, cement-based putty hmoov thiab gypsum-based putty hmoov yuav muaj qhov sib txawv thiab cov yam ntxwv vim yog cov khoom siv sib txawv. Cov khoom ntawm cov cement-based putty hmoov yuav ntxhib, thaum cov gypsum-based putty hmoov yuav zoo dua.
Kev siv thev naus laus zis: Hauv cov txheej txheem ntawm kev tsim cov hmoov putty, qib ntawm kev sib tsoo thiab qhov sib xws ntawm cov mis kuj tseem cuam tshuam rau cov hmoov zoo. Kev siv tshuab ua kom zoo dua tuaj yeem tsim cov hmoov nplej ntau dua thiab zoo tib yam putty.
2. Lub luag hauj lwm ntawm HPMC nyob rau hauv putty hmoov
HPMC, uas yog hydroxypropyl methylcellulose, yog ib qho tshuaj ntxiv hauv cov hmoov putty. Nws yog cov dej-soluble polymer uas feem ntau ua lub luag haujlwm ntawm thickening, dej tuav thiab txhim kho kev tsim kho. HPMC nws tus kheej tsis cuam tshuam ncaj qha rau particle fineness (xws li hmoov zoo) ntawm putty hmoov, tab sis nws muaj kev txhim kho tseem ceeb ntawm kev tsim kho ntawm putty hmoov:
Cov nyhuv tuav dej: Ib qho tseem ceeb ntawm HPMC yog dej tuav, uas tuaj yeem ncua cov dej hauv cov hmoov putty thaum tsim kho thiab tiv thaiv cov hmoov putty kom qhuav tawm ntxov ntxov thaum lub sij hawm tsim kho phab ntsa. Qhov no muaj txiaj ntsig zoo ntawm phab ntsa theem thiab adhesion, tshwj xeeb tshaj yog nyob rau hauv qhov kub thiab txias ib puag ncig, kev tuav dej yog qhov tseem ceeb tshwj xeeb.
Thickening nyhuv: HPMC tuaj yeem ua kom cov viscosity ntawm putty hmoov, kom nws muaj qhov sib xws thiab yooj yim khawb tom qab nplawm. Cov nyhuv no pab tswj lub fluidity ntawm putty hmoov thaum lub sij hawm tsim kho, txo cov phenomenon ntawm ya thiab hmoov ntog, thiab muaj peev xwm txhim khu kev sib raug zoo quab yuam, yog li indirectly txhim kho kev xav thaum lub sij hawm tsim kho.
Txhim kho kev tsim kho: Lub xub ntiag ntawm HPMC tuaj yeem ua cov hmoov putty yooj yim rau kev khiav lag luam thaum lub sij hawm tsim kho, xav tias smoother, thiab nthuav tawm cov nyhuv zoo ib yam thiab muag heev thaum smoothing. Txawm hais tias HPMC tsis hloov lub cev zoo ntawm cov hmoov putty hmoov, nws txhim kho kev ua haujlwm tag nrho thiab ua rau lub siab ntawm cov hmoov ntau dua thaum siv.
3. Indirect nyhuv ntawm HPMC rau qhov zoo ntawm putty hmoov
Txawm hais tias HPMC tsis hloov pauv qhov loj me me lossis lub cev zoo ntawm cov hmoov putty, nws txhim kho cov nyhuv ntawm putty hmoov los ntawm kev tuav dej, thickening, lubrication thiab lwm yam, ua cov hmoov putty smoother thiab yooj yim rau kev khiav lag luam thaum siv. Thaum lub sij hawm kev tsim kho, putty hmoov uas muaj HPMC yog yooj yim dua rau siv tiaj tus, txo cov khawb thiab tsis sib xws, uas ua rau cov neeg siv xav tias cov hmoov zoo dua.
Kev tuav dej ntawm HPMC tuaj yeem tiv thaiv kev tawg ntawm cov hmoov nplej hauv cov hmoov nplej thaum lub sij hawm ziab ntawm phab ntsa, uas tseem muaj txiaj ntsig zoo rau kev txhim kho tag nrho cov flatness thiab smoothness ntawm phab ntsa. Yog li ntawd, los ntawm qhov kev xav ntawm qhov kawg ntawm phab ntsa, HPMC muaj qee qhov cuam tshuam ncaj qha rau qhov zoo ntawm cov hmoov putty.
4. Kev sib raug zoo ntawm HPMC ntau npaum thiab hmoov zoo
Cov koob tshuaj ntawm HPMC kuj yuav tsum tau tswj kom raug. Feem ntau, qhov ntau npaum ntawm HPMC hauv cov hmoov putty yog me me, thiab kev siv ntau dhau yuav ua rau muaj teeb meem hauv qab no:
Tshaj-thickening: Yog tias qhov ntau npaum li cas ntawm HPMC ntau dhau lawm, cov hmoov putty yuav dhau los ua kua nplaum, ua rau nws nyuaj rau do, thiab tej zaum yuav ua rau muaj teeb meem xws li hmoov poob thiab nto nplaum. Nws tsis yog ib qho yooj yim los thov lub tiaj tus thaum lub sij hawm tsim kho, uas yuav cuam tshuam rau cov nyhuv phab ntsa zaum kawg thiab muab cov neeg zoo li cov hmoov ntxhib.
Txuas lub sij hawm kom qhuav: Cov dej tuav cov nyhuv ntawm HPMC yuav ncua lub sij hawm ziab ntawm cov hmoov putty. Yog tias qhov ntau npaum li cas, cov phab ntsa yuav tsis qhuav rau ib lub sij hawm ntev, uas kuj tsis haum rau kev tsim kho.
Yog li, qhov ntau npaum li cas ntawm HPMC yuav tsum nyob rau hauv qhov tsim nyog los ua nws lub luag haujlwm hauv kev txhim kho cov hmoov putty zoo.
Qhov zoo ntawm putty hmoov yog tsuas yog txiav txim siab los ntawm fineness ntawm nws cov khoom siv thiab muab tub lim, nrog rau cov txheej txheem ntau lawm thiab lwm yam. Raws li ib qho ntxiv hauv cov hmoov putty, HPMC tsis ncaj qha txiav txim siab cov hmoov zoo, tab sis nws muaj qhov cuam tshuam ncaj qha rau qhov zoo ntawm nws cov hmoov zoo los ntawm kev txhim kho cov dej tuav, thickening thiab kev tsim cov khoom ntawm putty hmoov. Kev siv HPMC tsim nyog tuaj yeem ua rau cov hmoov putty pom zoo dua thiab siv cov nyhuv thaum siv, txo cov kev tsim kho, thiab yog li txhim kho tag nrho cov flatness thiab fineness ntawm phab ntsa.
Post lub sij hawm: Sep-30-2024