Dab tsi yog dej tuav ntawm methyl cellulose ether (MC)

Dab tsi yog dej tuav ntawm methyl cellulose ether (MC)

Teb: Cov qib dej tuav yog ib qho tseem ceeb ntsuas ntsuas qhov zoo ntawm methyl cellulose ether, tshwj xeeb tshaj yog nyob rau hauv cov txheej txheem nyias ntawm cov cement-based thiab gypsum-based mortar. Txhim kho dej tuav tau zoo tuaj yeem tiv thaiv qhov tshwm sim ntawm lub zog poob thiab tawg los ntawm kev ziab ntau dhau thiab dej tsis txaus. Kev tuav dej zoo heev ntawm methyl cellulose ether nyob rau hauv qhov kub thiab txias yog ib qho tseem ceeb qhia kom paub qhov txawv ntawm methyl cellulose ether. Raws li ib txwm muaj, feem ntau cov methyl cellulose ethers txo lawv cov dej tuav raws li qhov kub thiab txias. Thaum qhov kub nce mus txog 40 ° C, cov dej khaws cia ntawm cov methyl cellulose ethers tau txo qis heev, uas yog ib qho tseem ceeb heev nyob rau hauv qhov kub thiab qhuav qhuav thiab nyias txheej tsim nyob rau sab hnub ci nyob rau lub caij ntuj sov yuav muaj kev cuam tshuam loj heev. Txawm li cas los xij, ua kom tsis muaj dej tuav los ntawm kev siv ntau ntau yuav ua rau cov khoom muaj viscosity siab vim yog siv ntau, uas yuav ua rau tsis yooj yim rau kev tsim kho.

Kev tuav dej yog ib qho tseem ceeb heev los txhim kho cov txheej txheem hardening ntawm cov ntxhia gelling tshuab. Nyob rau hauv qhov kev txiav txim ntawm cellulose ether, cov dej maj mam tso rau hauv lub hauv paus txheej los yog huab cua nyob rau lub sij hawm ntev, yog li xyuas kom meej tias cov cementitious khoom (cement los yog gypsum) muaj lub sij hawm ntev txaus los cuam tshuam nrog dej thiab maj mam harden.

Dab tsi yog cov khoom ntawm methyl cellulose ether?

Teb: Tsuas yog ib qho me me ntawm methyl cellulose ether ntxiv, thiab kev ua haujlwm tshwj xeeb ntawm gypsum mortar yuav zoo dua.

(1) Kho qhov sib xws

Methyl cellulose ether yog siv los ua cov thickener los kho qhov sib xws ntawm lub cev.

(2) Kho cov dej xav tau

Nyob rau hauv lub gypsum mortar system, dej xav tau yog ib qho tseem ceeb parameter. Qhov kev xav tau ntawm cov dej hauv paus, thiab cov khoom sib xyaw mortar, nyob ntawm qhov tsim ntawm gypsum mortar, piv txwv li, limestone, perlite, thiab lwm yam ntxiv. Kev koom ua ke ntawm methyl cellulose ether tuaj yeem kho cov dej xav tau thiab cov khoom pov tseg ntawm gypsum mortar.

(3) Kev ruaj ntseg dej

Cov dej tuav ntawm methyl cellulose ether, ib qho tuaj yeem kho lub sijhawm qhib thiab coagulation txheej txheem ntawm gypsum mortar system, thiaj li kho lub sijhawm ua haujlwm ntawm lub cev; ob lub methyl cellulose ether tuaj yeem maj mam tso dej rau lub sijhawm ntev Lub peev xwm ua kom muaj kev sib raug zoo ntawm cov khoom thiab cov substrate.

(4) Kho cov rheology

Qhov sib ntxiv ntawm methyl cellulose ether tuaj yeem kho qhov rheology ntawm plastering gypsum system, yog li txhim kho kev ua haujlwm: gypsum mortar muaj kev ua haujlwm zoo dua, kev ua haujlwm zoo dua los tiv thaiv sag, tsis muaj adhesion nrog cov cuab yeej siv thiab kev ua haujlwm siab dua, thiab lwm yam.

Yuav ua li cas xaiv qhov haum methyl cellulose ether?

Teb: Methyl cellulose ether cov khoom muaj cov yam ntxwv sib txawv raws li lawv txoj kev etherification, degree ntawm etherification, viscosity ntawm aqueous tov, lub cev muaj zog xws li particle fineness, solubility yam ntxwv thiab kev hloov kho txoj kev. Txhawm rau kom tau txais txiaj ntsig zoo tshaj plaws, nws yog ib qho tsim nyog yuav tsum xaiv lub npe ntawm cellulose ether kom raug rau daim ntawv thov sib txawv, thiab cov npe xaiv ntawm methyl cellulose ether yuav tsum sib haum nrog cov tshuaj khib nyiab siv.

Methyl cellulose ethers muaj nyob rau hauv txawv viscosities kom haum rau ntau yam kev xav tau. Methyl cellulose ether tuaj yeem ua lub luag haujlwm tsuas yog tom qab yaj, thiab nws qhov kev sib cais yuav tsum tau ua raws li daim ntawv thov thiab kev tsim kho. Cov khoom siv hmoov zoo yog tsim rau cov tshuab ziab khaub ncaws qhuav (xws li tshuaj tsuag plastering plaster). Cov khoom zoo heev ntawm methyl cellulose ether tuaj yeem ua kom tawg sai sai, kom nws cov kev ua tau zoo tuaj yeem ua haujlwm tau zoo hauv lub sijhawm luv luv tom qab tsim cov mortar ntub. Nws ua rau kom qhov sib xws thiab dej tuav ntawm mortar hauv lub sijhawm luv luv. Qhov no tshwj xeeb tshaj yog haum rau cov neeg kho tshuab kev tsim kho, vim hais tias feem ntau, lub sij hawm sib tov ntawm dej thiab qhuav-siv mortar yog luv heev thaum lub sij hawm kho tshuab.

Dab tsi yog dej tuav ntawm methyl cellulose ether?

Teb: Qhov kev ua tau zoo tshaj plaws ntawm cov qib sib txawv ntawm methyl cellulose ether (MC) yog lawv cov dej khaws cia hauv cov khoom siv hauv tsev. Txhawm rau kom tau txais kev ua haujlwm zoo, nws yog ib qho tsim nyog yuav tsum khaws cov dej noo txaus nyob rau hauv mortar ntev. Vim tias cov dej ua cov roj nplua nyeem thiab cov kuab tshuaj ntawm cov khoom siv tsis zoo, cov txheej txheej nyias nyias tuaj yeem muab pov tseg thiab plastered mortars tuaj yeem kis tau nrog cov trowels. Cov phab ntsa lossis cov vuas tsis tas yuav tsum tau ntub dej ua ntej tom qab siv cellulose ether-ntxiv mortar. Yog li MC tuaj yeem nqa cov txiaj ntsig kev tsim kho sai thiab kev lag luam.

Txhawm rau teeb tsa, cov ntaub ntawv cementitious xws li gypsum yuav tsum tau hydrated nrog dej. Tus nqi tsim nyog ntawm MC tuaj yeem khaws cov dej noo nyob rau hauv mortar rau lub sijhawm ntev txaus, kom cov txheej txheem kev teeb tsa thiab tawv tawv tuaj yeem txuas ntxiv mus. Tus nqi ntawm MC yuav tsum tau kom muaj peev xwm tuav tau dej txaus nyob ntawm qhov nqus ntawm lub hauv paus, muaj pes tsawg leeg ntawm mortar, thickness ntawm cov mortar txheej, cov dej xav tau ntawm cov mortar, thiab lub sij hawm teem caij ntawm cov khoom cementitious.

Qhov zoo dua qhov me me ntawm MC, qhov ceev ntawm cov mortar thickens.