Hydroxypropyl methylcellulose HPMC feem ntau yog siv rau hauv molding ntawm cement mortar thiab gypsum khoom raws li ib tug dispersant, thickener thiab binder nyob rau hauv lub tsev kho mob. Nws yog siv rau hauv cov cement mortar kom nws cohesiveness, txo flocculation, txhim kho viscosity thiab shrinkage, thiab muaj dej tuav. Txo cov dej poob thiab lub zog ntawm pob zeb nto, tiv thaiv cov kab nrib pleb thiab huab cua ntawm cov dej-soluble ntsev; Hydroxypropyl methylcellulose HPMC muaj thixotropy, uas tuaj yeem siv los npaj cov xim tsis muaj kua nplaum uas tuaj yeem siv rau ntawm phab ntsa ntsug hauv ib lub tsho tuab; HPMC txhim kho adhesion thiab ua haujlwm tau zoo, yog li nws yog qhov tsim nyog rau kev npaj yooj yim ntws txau mortar rau nyias txheej xim.
Tus nqi ntawm HPMC siv hauv cov khoom siv hauv tsev tsawg heev, tsuas yog 0.1% ~ 1%, tab sis nws muaj txiaj ntsig zoo. Nws tuaj yeem siv ua plasticizer, tackifier, dej tuav tus neeg saib xyuas, tus neeg saib xyuas huab cua thiab cov khoom siv rov qab rau cov xim, plaster, mortar thiab cement, kom nws ua haujlwm tau zoo, tuav dej los yog adhesion nrog lub hauv paus chav kawm. Tsis tas li ntawd, raws li cov kev cai ntawm kev tiv thaiv ib puag ncig, thaum qhuav sib tov mortar, kev ua haujlwm tsis ruaj khov tshwm sim los ntawm kev sib xyaw ntawm qhov chaw, kev ua qias tuaj rau ib puag ncig ib puag ncig, kev tsim kho tsis zoo thiab kev ua haujlwm tsis zoo yog zam. Cov nplaum rau cov vuas luaj ceramic thiab sab hauv thiab sab nrauv phab ntsa putty siv 107 nplaum. Los ntawm qhov kev xav ntawm kev tiv thaiv ib puag ncig, cellulose ether yog qhov zoo tagnrho, xws li HEC thiab HPMC.
Cov cement muaj kev sib txuas zoo, tab sis kev sib koom ua ke ntawm cov cement slurry thiab cement mortar yog qhov sib txawv vim qhov sib txawv ntawm kev ua tau zoo thiab cov xwm txheej ntawm cov txheej txheem sib txuas thiab cov khoom sib txuas thaum lub sij hawm tsim kho. Thaum cov dej nqus dej ntawm qhov sib txuas ntawm qhov chaw loj, nws yuav ua rau lub cev qhuav dej ntawm qhov chaw sib txuas, txo cov plasticity thiab adhesion ntawm cov cement mortar, thiab txo cov kev sib txuas zoo heev. Yav dhau los, gypsum los yog 107 kua nplaum tau ntxiv rau cov cement mortar, tab sis tseem muaj qee qhov tsis xws luag xws li kev ntsuas tsis zoo thiab kev tsim kho thev naus laus zis. Viscosity nce cov txiaj ntsig ntawm cellulose ether hauv dej thiab lub hauv paus tsis muaj zog.
Cov teebmeem ntawm cellulose ether ntxiv muaj xws li:
1. Txhim kho lub sijhawm pib thiab zaum kawg ntawm cov cement;
2. Txhim kho qhov kev ntxhov siab ntawm cov cement mortar;
3. Txhim kho lub peev xwm tuav dej ntawm cov cement thiab gypsum;
4. Lub zog compressive thiab shear zog ntawm cement mortar txo;
5. Txhim kho kev sib koom ua ke ntawm mortar.
Post lub sij hawm: Oct-17-2022