Cov hmoov ntawm cov hmoov putty feem ntau yog hais txog qhov tshwm sim uas cov txheej txheej ntawm putty ua hmoov thiab ntog tawm tom qab kev tsim kho, uas yuav cuam tshuam rau lub zog sib txuas ntawm putty thiab durability ntawm txheej. Qhov tshwm sim hmoov no muaj feem xyuam rau ntau yam, ib qho yog kev siv thiab zoo ntawm hydroxypropyl methylcellulose (HPMC) hauv cov hmoov putty.
1. Lub luag hauj lwm ntawm HPMC nyob rau hauv putty hmoov
HPMC, raws li kev siv tshuaj ntxiv, yog siv dav hauv cov khoom siv hauv tsev, nrog rau cov hmoov putty, mortar, kua nplaum, thiab lwm yam. Nws lub luag haujlwm tseem ceeb suav nrog:
Cov nyhuv Thickening: HPMC tuaj yeem ua kom cov hmoov sib xyaw ua ke ntawm cov hmoov putty, ua rau kev tsim kho kom zoo dua qub thiab tsis txhob plam lossis ntws ntawm cov hmoov putty thaum tsim kho.
Kev tuav dej: HPMC muaj cov dej tuav zoo, uas tuaj yeem txuas ntxiv kev ua haujlwm ntawm cov hmoov putty thiab tiv thaiv cov putty los ntawm kev poob dej sai heev thaum lub sij hawm ziab, ua rau tawg lossis shrinkage.
Txhim kho adhesion: HPMC tuaj yeem ua kom cov adhesion ntawm putty hmoov, kom nws tuaj yeem ua raws li phab ntsa lossis lwm qhov chaw substrate, txo qhov tshwm sim ntawm cov teeb meem xws li hollowing thiab ntog tawm.
Txhim kho kev tsim kho: Ntxiv HPMC rau cov hmoov putty tuaj yeem txhim kho fluidity thiab plasticity ntawm kev tsim kho, ua rau kev tsim kho kom zoo dua qub, thiab txo cov khoom pov tseg.
2. Yog vim li cas rau putty hmoov pulverization
Putty hmoov pulverization yog ib qho teeb meem tshwm sim nrog cov laj thawj nyuaj, uas yuav cuam tshuam nrog cov hauv qab no:
Substrate teeb meem: Cov dej nqus ntawm cov substrate muaj zog heev, ua rau lub putty poob noo sai heev thiab solidify tsis tiav, ua rau pulverization.
Putty formula teeb meem: Cov mis tsis zoo ntawm cov hmoov putty, xws li tsis tsim nyog feem ntawm cov ntaub ntawv cementitious (xws li cement, gypsum, thiab lwm yam), yuav cuam tshuam rau lub zog thiab durability ntawm putty.
Kev tsim kho teeb meem: Kev tsim kho tsis tu ncua, qhov kub thiab txias lossis cov av qis kuj tseem tuaj yeem ua rau cov hmoov putty pulverize thaum lub sij hawm ziab.
Kev saib xyuas tsis raug: Kev ua tsis tiav ntawm kev tuav cov putty hauv lub sijhawm tom qab kev tsim kho lossis ua ntej ntxov rau cov txheej txheem tom ntej tuaj yeem ua rau cov hmoov putty pulverize yam tsis tau qhuav tag.
3. Kev sib raug zoo ntawm HPMC thiab pulverization
Raws li cov thickener thiab dej-retaining tus neeg sawv cev, kev ua tau zoo ntawm HPMC hauv cov hmoov putty muaj qhov cuam tshuam ncaj qha rau qhov zoo ntawm putty. Kev cuam tshuam ntawm HPMC ntawm cov hmoov hmoov yog qhov tseem ceeb hauv cov hauv qab no:
(1) Kev cuam tshuam ntawm kev tuav dej
Cov hmoov ntawm cov hmoov putty feem ntau muaj feem xyuam rau cov evaporation sai ntawm cov dej hauv putty. Yog tias tus nqi ntawm HPMC ntxiv tsis txaus, cov hmoov putty poob dej sai heev thaum lub sij hawm ziab thiab tsis ua kom tiav, ua rau cov hmoov av. Cov khoom tuav dej ntawm HPMC pab cov putty tswj cov dej kom tsim nyog thaum lub sij hawm ziab, cia cov putty maj mam harden thiab tiv thaiv hmoov los ntawm dej sai sai. Yog li ntawd, kev tuav dej ntawm HPMC yog qhov tseem ceeb rau kev txo cov hmoov nplej.
(2) Kev cuam tshuam ntawm thickening nyhuv
HPMC tuaj yeem ua kom cov hmoov sib xyaw ua ke ntawm cov hmoov putty, yog li cov putty tuaj yeem txuas ntxiv mus rau lub substrate. Yog tias qhov zoo ntawm HPMC tsis zoo lossis siv tsis raug, nws yuav cuam tshuam rau qhov sib xws ntawm cov hmoov putty, ua rau nws cov dej ntws tsis zoo, ua rau tsis sib xws thiab tsis sib xws thaum tsim kho, uas yuav ua rau cov hmoov putty qhuav sai sai hauv zos, yog li ntawd. ua rau hmoov. Tsis tas li ntawd, kev siv ntau dhau ntawm HPMC tseem yuav ua rau lub ntsej muag ntawm cov hmoov putty kom du dhau tom qab kev tsim kho, cuam tshuam rau qhov adhesion nrog cov txheej thiab ua rau cov hmoov av.
(3) Kev sib koom ua ke nrog lwm cov ntaub ntawv
Hauv cov hmoov putty, HPMC feem ntau yog siv ua ke nrog lwm cov ntaub ntawv cementitious (xws li cov cement, gypsum) thiab cov khoom ntim (xws li cov hmoov calcium hnyav, talcum hmoov). Tus nqi ntawm HPMC siv thiab nws cov kev sib koom ua ke nrog lwm cov ntaub ntawv muaj kev cuam tshuam zoo rau tag nrho kev ua haujlwm ntawm putty. Cov mis tsis tsim nyog yuav ua rau lub zog tsis txaus ntawm cov hmoov putty thiab nws thiaj li ua rau hmoov. Kev siv HPMC tsim nyog tuaj yeem pab txhim kho kev sib koom ua ke thiab lub zog ntawm putty thiab txo cov hmoov av los ntawm cov khoom siv tsis txaus lossis tsis sib xws.
4. HPMC cov teeb meem zoo ua rau hmoov hmoov
Ntxiv rau qhov nyiaj ntawm HPMC siv, qhov zoo ntawm HPMC nws tus kheej kuj tuaj yeem cuam tshuam rau kev ua haujlwm ntawm cov hmoov putty. Yog tias qhov zoo ntawm HPMC tsis yog raws li tus qauv, xws li tsis tshua muaj cellulose purity thiab cov dej tuav tsis zoo, nws yuav cuam tshuam ncaj qha rau cov dej tuav, kev tsim kho thiab lub zog ntawm cov hmoov putty, thiab ua rau muaj kev pheej hmoo ntawm hmoov hmoov. Inferior HPMC tsis tsuas yog nyuaj los muab cov dej ruaj khov thiab cov nyhuv thickening, tab sis kuj tseem tuaj yeem ua rau tawg, hmoov thiab lwm yam teeb meem thaum lub sij hawm ziab ntawm putty. Yog li ntawd, xaiv cov khoom zoo HPMC yog qhov tseem ceeb kom tsis txhob muaj teeb meem ntawm hmoov.
5. Cov nyhuv ntawm lwm yam ntawm cov hmoov nplej
Txawm hais tias HPMC ua lub luag haujlwm tseem ceeb hauv cov hmoov putty, hmoov hmoov feem ntau yog los ntawm kev sib xyaw ua ke ntawm ntau yam. Cov hauv qab no kuj tseem tuaj yeem ua rau hmoov av:
Ib puag ncig tej yam kev mob: Yog hais tias qhov kub thiab av noo ntawm kev tsim kho ib puag ncig yog siab dhau los yog qis dhau, nws yuav cuam tshuam rau qhov ziab kom qhuav thiab qhov kawg curing nyhuv ntawm cov hmoov putty.
Kev kho tsis zoo substrate: Yog hais tias lub substrate tsis huv los yog qhov chaw ntawm lub substrate absorbs dej ntau dhau lawm, nws yuav cuam tshuam rau adhesion ntawm cov hmoov putty thiab ua rau hmoov.
Irrational putty hmoov mis: siv ntau dhau los yog tsawg dhau HPMC, thiab cov khoom siv cementitious feem ntau tsis tsim nyog, uas yuav ua rau tsis txaus adhesion thiab lub zog ntawm cov hmoov putty, yog li ua rau hmoov.
Cov hmoov phenomenon ntawm putty hmoov yog ze ze rau kev siv HPMC. Lub luag haujlwm tseem ceeb ntawm HPMC hauv cov hmoov putty yog dej tuav thiab thickening. Kev siv tsim nyog tuaj yeem tiv thaiv qhov tshwm sim ntawm cov hmoov nplej. Txawm li cas los xij, qhov tshwm sim ntawm cov hmoov hmoov tsis yog nyob ntawm HPMC nkaus xwb, tab sis kuj yog nyob ntawm cov khoom xws li cov mis ntawm putty hmoov, kev kho substrate, thiab kev tsim kho ib puag ncig. Txhawm rau kom tsis txhob muaj teeb meem ntawm hmoov hmoov, nws tseem yog ib qho tseem ceeb heev uas yuav tau xaiv HPMC zoo, tsim qauv tsim qauv, kev siv technology thiab kev tsim kho zoo.
Post lub sij hawm: Oct-15-2024