Dab tsi yog lub tswv yim tseem ceeb ntawm starch ether?
Teb: hmoov txhuv nplej siab ether feem ntau yog siv hauv kev tsim kho cug, hloov thiab txiv qaub, thiab hloov chaw ua tshuaj khib. Cov hmoov txhuv nplej siab feem ntau yog siv rau hauv kev sib txuas nrog cov neeg tsis tau hloov kho thiab hloov kho cellulos. Nws yog qhov haum rau ob qho nruab nrab thiab cov tshuab alkaline, thiab tau tshaj tawm nrog feem ntau additives hauv gypsum thiab cov hmoov txhuv nplej siab thiab polyvinyl acetate thiab lwm yam dej-soluble polymers).
Cov yam ntxwv ntawm cov hmoov txhuv nplej siab ether feem ntau yog dag hauv:
(1) txhim kho Sag tiv taus;
(2) Txhim kho cov kev tsim muaj zog;
(3) lub siab dua cream tawm.
Dab tsi yog qhov tseem ceeb ntawm cov hmoov txhuv nplej ether hauv gypsum-raws li cug tshuaj qhuav?
COV LUS TEB: Cov hmoov txhuv nplej siab ether yog ib qho ntawm cov yeeb yaj kiab ntawm cov hmoov av qhuav. Nws tuaj yeem sib xws nrog lwm cov tshuaj ntxiv. Nws yog dav siv nyob rau hauv cov khoom lag luam nplais, cov roj plastering gypsum, Masonymo raws li kev ua neeg nplua nuj, nws tseem yog tsim nyog rau kev siv tes ua ke lossis tshuaj txau lossis tshuaj txau lossis pob zeb. Nws ua haujlwm li nram no:
(1) Cov hmoov txhuv nplej siab ether feem ntau yog siv los ua ke nrog methyl cellulose ether, uas qhia tau tias muaj kev sib tw zoo ntawm ob. Ntxiv tus nqi tsim nyog ntawm cov hmoov txhuv nplej siab ether rau methyl cellulose thiab swb tsis kam ntawm lub tshuaj khib, nrog cov txiaj ntsig siab.
(2) Ntxiv tus nqi tsim nyog ntawm cov hmoov txhuv nplej siab etle ether cellulose ether tau nce ntxiv cov tshuaj khib, thiab ua rau cov kev tsim kho kom du thiab du.
(3) Ntxiv tus nqi tsim nyog ntawm cov hmoov txhuv nplej siab etle rau cov tshuaj khib ether tuaj yeem ua kom cov dej tawm ntawm lub tshuaj khib thiab ntev lub sij hawm qhib.
Dab tsi yog qhov kev thov cov txiaj ntsig thiab kev cia cov hau kev ntawm cov hmoov txhuv nplej siab ether?
Teb: Nws tuaj yeem siv ua ib admixture rau cov cement-based khoom, gypsum-based khoom thiab cov khoom lag luam tshauv.
(1) Qhov zoo thiab cov ntawv thov:
a. Nws muaj cov nyhuv tuab ntawm lub tshuaj khib, tuaj yeem ua kom tuab sai, thiab muaj lubricity zoo;
b. Qhov ntau npaum li cas yog me me, thiab ib qho kev noj tshuaj tsawg heev tuaj yeem ua tiav qhov kev cuam tshuam loj;
c. Txhim kho kev tiv thaiv kev tawm tsam ntawm cug cug sib xyaw ua ke;
d. txuas lub sijhawm qhib ntawm cov khoom;
e. Txhim kho kev ua haujlwm ntawm cov khoom thiab ua haujlwm smoother.
(2) cia:
Cov khoom yog qhov raug rau cov dej noo thiab yuav tsum muab khaws cia rau hauv qhov chaw qhuav thiab txias rau hauv cov ntim thawj. Nws yog qhov zoo tshaj plaws los siv nws hauv 12 lub hlis. (Nws raug nquahu kom siv rau hauv kev sib txuas nrog cov volcosity cellulose ether, thiab tus dav dav ether yog 7: 3 ~ 8: 2)
Dab tsi yog lub luag haujlwm ntawm methyl cellulose ether nyob rau hauv cov hmoov av qhuav?
A: Methyl hydrotyl cellulose cellulose cellulose cellulose cellulose ether (MHEC) thiab methyl hydrothpropyl cellulose mus rau li methyl cellulose ether.
Hauv kev thaj teb qhuav tshuaj khib lav, cellulose cellulose, plastering hloov kho cov khoom, cov tshuaj colle, cov tshuaj khib nyiab, cov khoom siv hluav taws xob, cov khoom siv roj caulking. Nyob rau ntau yam hmoov nplej mortars, methyl cellulose ether feem ntau ua lub luag haujlwm ntawm dej khaws cia thiab thickening.
Dab tsi yog cov txheej txheem ntawm methylcellulose?
Teb: Firstly, lub cellulose raw khoom yog crushed, ces alkalized thiab pulped nyob rau hauv kev txiav txim ntawm caustic dej qab zib. Ntxiv Olemas oxide (xws li ethylene oxide lossis propylene oxide) thiab methyl chloride rau etherification. Thaum kawg, dej ntxuav thiab lim tau yog nqa tawm thaum kawg tau txais cov hmoov dawb. Cov hmoov no, tshwj xeeb nws cov kua aqueous, muaj cov khoom siv lub cev. Lub cellulose ether siv nyob rau hauv kev tsim kho kev tsim kho yog methyl hydroulrope etherco lossis MHPC, lossis ib qho kev sim ua ke MC). Cov khoom no ua si lub luag haujlwm tseem ceeb hauv thaj teb qhuav cug. lub luag haujlwm tseem ceeb.
Lub sij hawm Post: Feb-22-2025