Redispersible looj hmoov (xws li lwm yam kev ua tsis tau zoo, gypsum, av nplaum ether, wood ether, wood ether, wood andclection, thiab lwm yam) tov cug. Thaum cov tshuaj ntxuav hmoov qhuav ntxiv rau cov dej thiab cov khoom siv tshuab hluav taws xob ua tau txaus rau hauv dej, uas yog txaus kom tau cov hmoov av redispersible. Kev sib xyaw ntawm cov roj hmab hmoov muaj cov kev sib txawv ntawm cov hmoov av thiab cov khoom siv sib txawv ntawm cov hmoov av ntawm cov roj hmab thiab ntau yam kev sib cav sib ceg Ua kom viscosity zuj zus.
Nws yog feem ntau ntseeg hais tias kev rov hais txog cov hmoov av zoo los txhim kho lub vortx ntawm cov slurry thiab txhim kho cov cohesion ntawm cov kev siv hluav taws xob. Tom qab cov tshiab sib xyaw muaj cov hmoov txhuas rho tawm yog tsim, cov dej yuav maj mam txo qis, thiab thaum kawg sib sau ua ke, thiab thaum kawg kev sib sau ua yeeb yaj kiab. Cov txheej txheem ntawm polymer zaj duab xis tsim tau muab faib ua peb theem. Nyob rau hauv thawj theem, cov polymer hais tawm mus dawb rau hauv daim ntawv ntawm brownian suab nyob rau hauv thawj zaug emulsion. Raws li cov dej yaj, kev txav ntawm cov lus yog ib txwm muaj ntau thiab ntau qhov kev ntxhov siab ntawm dej thiab huab cua yuam kom maj mam ua ke. Nyob rau theem ob, thaum cov khoom sib tham tau sib chwv, thiab cov dej muaj zog los ua ke ntawm cov capillary ntxeem tau thov kom muaj kev sib raug zoo, thiab cov dej uas tseem tshuav ua ke, thiab cov yeeb yaj kiab tseem tshuav ua ke, thiab cov yeeb yaj kiab tseem tshuav. Qhov thib peb, theem kawg nkaus tso cai rau qhov diffusion (qee zaum hu ua tus kheej-adhesion) ntawm cov polymer lwg me me los ua qhov tseeb ua yeeb yaj kiab. Thaum lub sij hawm ua yeeb yaj kiab tsim, cais txawb cov kab mob txawb sib sau ua cov yeeb yaj kiab tshiab theem nrog kev ntxhov siab ntau tshaj. Pom tseeb, nyob rau hauv thiaj li yuav pab kom cov redispersible polymer hmoov los ua ib zaj yeeb yaj kiab, nws yog ib qho tsim nyog los xyuas kom meej qhov ntsuas kub (Mft) yog qis dua li kev kho tus kheej ntawm lub cug.
Colloids yuav tsum tau sib cais los ntawm cov polymer membrane system. Qhov no tsis yog teeb meem hauv Alkaline Collation Collation, vim tias nws yuav maj mam muab cov yeeb yaj kiab quartz tsim nyog los ntawm kev ua kom muaj kev cuam tshuam ntawm cov txiv ntoo, tab sis kuj tseem ua rau cov kev mob siab, tab sis kuj tseem nyob hauv cov kev mob siab ntev.
Nrog rau qhov kawg tsim ntawm cov yeeb yaj kiab polymer, cov txheej txheem muaj cov qauv zoo nkauj, uas yog cov duab ua ke tsim los ntawm cov khoom siv hydraulic, thiab cov yeeb yaj kiab tsim los ntawm redispersible looj thiab tawv nto. Saj zawg zog network. Lub zog tensile thiab cohesion ntawm cov yeeb yaj kiab polymer tsim los ntawm cov hmoov yas yog txhim kho. Vim tias qhov hloov pauv ntawm polymer, qhov muaj peev xwm deformation muaj peev xwm ntau dua li ntawm lub cug lub pob zeb nruj heev, yog li txhim kho cov capt tsis kam ntawm lub cug.
Nrog kev nce ntawm cov ntsiab lus ntawm redispersible looj hmoov, tag nrho cov kab ke tsim rau cov yas. Nyob rau hauv cov ntaub ntawv ntawm cov ntsiab lus zoo cov ntsiab lus, cov tshuaj khib nyiab hauv cov khoom sib xyaw ua ke thiab ua ib qho kev ua haujlwm ntawm cov khoom noj muaj txiaj ntsig, thaum cov khoom siv hydration ntawm cov cement ua "muab tub lim". . rog, cug cug yog tswj hwm kom muaj kev ntxhov siab thiab tsis muaj zog ntawm kev txhim kho thiab muaj zog ntawm cov khoom siv hluav taws xob. Ib qho ntxiv, elasticity. Ib qho ntxiv, cov interwoven polymer actomins kuj tabkaum lub coalescence ntawm microcacks rau hauv kev ua kom loj taub hau. Yog li, cov neeg muaj cov hmoov nplej polymer polymer thiab tsis ua tiav cov khoom siv tsis ua haujlwm.
Cov yeeb yaj kiab polymer nyob rau hauv polymer hloov cug tau muaj qhov cuam tshuam tseem ceeb rau cov cortaring tawv. Redispersible looj hmoov faib rau ntawm lub interface ua si lwm lub luag haujlwm thiab ua yeeb yaj kiab ua yeeb yam, uas yog kom nce adhesion rau cov ntaub ntawv tiv tauj. Hauv microstructure ntawm cov hmoov polymer hloov lub cug cov tshuaj khib thiab cov yeeb yaj kiab uas muaj cov kab vaph formed los ntawm cov dej veptures tsis tshua muaj pa thiab txoj cai xis. Lub chaw sib tiv tauj ntawm ob qho kev sib tiv tauj cov ntaub ntawv yog ib thaj chaw pheej hmoo ntau rau cov kev tawg rau cov kab tawg kom ua thiab ua rau ploj ntawm cohesion. Yog li ntawd, lub peev xwm ntawm cov yeeb yaj kiab latex kom zoo shrinkage cracks yog qhov tseem ceeb rau cov nplais nplaum.
Lub Sijhawm Post: Feb-14-2025