Cov hmoov txhuv nplej siab ether feem ntau yog siv hauv kev tsim mortar, uas tuaj yeem cuam tshuam qhov sib xws ntawm mortar raws li gypsum, cement thiab txiv qaub, thiab hloov kev tsim kho thiab sag kuj ntawm mortar. Cov hmoov txhuv nplej siab ethers feem ntau yog siv ua ke nrog cov tsis hloov pauv thiab hloov kho cellulose ethers. Nws yog haum rau ob qho tib si nruab nrab thiab alkaline systems, thiab yog sib xws nrog feem ntau additives nyob rau hauv gypsum thiab cement khoom (xws li surfactants, MC, starch thiab polyvinyl acetate thiab lwm yam dej-soluble polymers).
Cov yam ntxwv ntawm starch ether feem ntau raws li hauv qab no:
(1) Txhim kho sag kuj;
(2) Txhim kho kev tsim kho;
(3) High mortar tawm los.
Dab tsi yog qhov tseem ceeb ntawm cov hmoov txhuv nplej siab ether hauv gypsum-raws li mortar qhuav?
Teb: Cov hmoov txhuv nplej siab ether yog ib qho ntawm cov khoom tseem ceeb ntawm cov hmoov qhuav mortar. Nws tuaj yeem sib xyaw nrog lwm cov tshuaj ntxiv. Nws yog dav siv nyob rau hauv cov pobzeb nplaum, kho mortars, plastering gypsum, sab hauv thiab sab nrauv phab ntsa putty, gypsum-raws li caulking thiab sau cov ntaub ntawv, interface agents, masonry nyob rau hauv mortars, nws kuj yog haum rau tes los yog tshuaj tsuag daim ntawv thov nrog xis mas los yog gypsum. - raws li mortars. Nws ua haujlwm raws li hauv qab no:
(1) Cov hmoov txhuv nplej siab ether feem ntau yog siv ua ke nrog methyl cellulose ether, uas qhia tau hais tias muaj txiaj ntsig zoo ntawm ob qho tib si. Ntxiv qhov tsim nyog ntawm cov hmoov txhuv nplej siab ether rau methyl cellulose ether tuaj yeem txhim kho qhov sag kuj thiab plam tsis kam ntawm mortar, nrog rau cov txiaj ntsig siab.
(2) Ntxiv qhov tsim nyog ntawm cov hmoov txhuv nplej siab ether rau hauv cov tshuaj khib nyiab uas muaj methyl cellulose ether tuaj yeem ua rau muaj qhov sib xws ntawm cov tshuaj khib nyiab, txhim kho cov dej ntws, thiab ua rau kev tsim kho kom zoo thiab du.
(3) Ntxiv qhov tsim nyog ntawm cov hmoov txhuv nplej siab ether rau hauv mortar uas muaj methyl cellulose ether tuaj yeem ua rau kom cov dej tuav ntawm cov tshuaj khib thiab ua kom lub sijhawm qhib.
Dab tsi yog qhov zoo ntawm daim ntawv thov thiab txoj hauv kev cia cov hmoov txhuv nplej siab ether?
Teb: Nws tuaj yeem siv los ua cov khoom sib xyaw rau cov khoom siv cement, cov khoom siv gypsum thiab cov khoom siv hmoov tshauv-calcium.
(1) Qhov zoo thiab kev siv:
ib. Nws muaj cov nyhuv thickening ntawm mortar, tuaj yeem ua kom tuab sai, thiab muaj lubricity zoo;
b. Cov koob tshuaj me me, thiab qhov ntau npaum li cas tuaj yeem ua tiav cov txiaj ntsig siab;
c. Txhim kho qhov muaj peev xwm tiv thaiv swb ntawm kev sib raug zoo mortar;
d. ncua lub sijhawm qhib ntawm cov khoom siv;
e. Txhim kho qhov kev ua haujlwm ntawm cov khoom siv thiab ua kom cov haujlwm smoother.
(2) Cia:
Cov khoom yog susceptible rau ya raws thiab yuav tsum tau muab cia rau hauv ib tug qhuav thiab txias qhov chaw nyob rau hauv thawj ntim. Nws yog qhov zoo tshaj los siv nws hauv 12 lub hlis. (Nws raug pom zoo kom siv ua ke nrog high-viscosity cellulose ether, thiab qhov sib piv ntawm cellulose ether rau starch ether yog 7: 3 ~ 8: 2)
Lub luag hauj lwm ntawm methyl cellulose ether nyob rau hauv qhuav hmoov mortar yog dab tsi?
A: Methyl hydroxyethyl cellulose ether (MHEC) thiab methyl hydroxypropyl cellulose ether (HPMC) raug hu ua methyl cellulose ether.
Nyob rau hauv daim teb ntawm cov hmoov qhuav mortar, methyl cellulose ether yog ib qho tseem ceeb hloov khoom siv rau cov hmoov qhuav mortar xws li plastering mortar, plastering gypsum, pobzeb nplaum, putty, self-leveling khoom, tshuaj tsuag mortar, wallpaper nplaum thiab cov khoom siv caulking. Nyob rau hauv ntau yam qhuav hmoov mortars, methyl cellulose ether mas plays lub luag hauj lwm ntawm dej tuav thiab thickening.
Dab tsi yog cov txheej txheem ntawm cellulose ether?
Teb: Ua ntej, cov khoom siv cellulose yog crushed, ces alkalized thiab pulped nyob rau hauv qhov kev txiav txim ntawm caustic soda. Ntxiv olefin oxide (xws li ethylene oxide los yog propylene oxide) thiab methyl chloride rau etherification. Thaum kawg, kev ntxuav dej thiab ntxuav kom huv yog ua tiav kom tau txais cov hmoov dawb. Cov hmoov no, tshwj xeeb tshaj yog nws cov tshuaj aqueous, muaj lub cev zoo nkauj. Cov cellulose ether siv nyob rau hauv kev tsim kho kev lag luam yog methyl hydroxyethyl cellulose ether los yog methyl hydroxypropyl cellulose (abbreviated li MHEC los yog MHPC, los yog ib tug ntau simplified lub npe MC). Cov khoom no plays lub luag hauj lwm tseem ceeb heev nyob rau hauv lub teb ntawm qhuav hmoov mortar. lub luag haujlwm tseem ceeb.
Post lub sij hawm: Jan-30-2023