Hauv cov khoom siv kho kom zoo nkauj hauv tsev, putty yog cov khoom siv yooj yim rau phab ntsa leveling thiab primer, uas yog ncaj qha cuam tshuam rau kev tsim kho kom zoo thiab zoo nkauj ntawm cov txheej tom ntej, phab ntsa thiab lwm yam tiav. Txhawm rau txhim kho kev tsim kho kev ua haujlwm thiab siv kev ua haujlwm ntawm putty, ib feem ntawmcellulose etheradditives feem ntau ntxiv rau nws cov mis. Nyob rau hauv xyoo tas los no, hloov kho cellulose ether tau maj mam dhau los ua ib qho tseem ceeb hauv kev tsim cov putty vim nws cov kev ua tau zoo heev.
1. Txheej txheem cej luam ntawm hloov cellulose ethers
Cellulose ether yog ib chav kawm ntawm cov dej-soluble los yog dispersible polymer tebchaw ua los ntawm etherifying thiab hloov ib feem ntawm hydroxyl pawg ntawm natural cellulose los ntawm tshuaj txoj kev. Feem ntau cov cellulose ethers muaj xws li hydroxypropyl methylcellulose (HPMC), methyl cellulose (MC), sodium carboxymethyl cellulose (CMC-Na), thiab lwm yam. Lub thiaj li hu ua "hloov" cellulose ether yog hais txog kev taw qhia txog kev ua haujlwm hloov pauv lossis kev tswj hwm ntawm nws cov qauv ntawm lub hauv paus ntawm kev txhim kho cov dej cellulose, soothe cellulose. alkali tsis kam, thiab lwm yam, kom ua tau raws li qhov yuav tsum tau ua ntawm cov khoom siv hauv tsev siv.
2. Mechanism ntawm kev txiav txim ntawm hloov cellulose ether nyob rau hauv putty
Phab ntsa putty feem ntau yog tsim los ntawm cov ntaub ntawv inorganic xws li txiv qaub hmoov, cement, talcum hmoov, thiab lwm yam. Cov ntaub ntawv no yooj yim rau precipitate, delaminate, tawg los yog muaj kev tsim kho tsis zoo tom qab ntxiv dej thiab nplawm. Tom qab ntxiv hloov kho cellulose ether, nws tsuas yog ua lub luag haujlwm hauv qab no hauv putty:
Txhim kho cov dej tuav: Hloov kho cellulose ether muaj qhov nqus dej zoo heev thiab khaws cov dej, uas tuaj yeem kaw cov dej kom ruaj khov, tiv thaiv cov dej los ntawm evaporating sai los yog absorbed los ntawm lub hauv paus txheej thaum lub sij hawm tsim kho, yog li xyuas kom meej tias lub putty muaj txaus hydration cov tshuaj tiv thaiv lub sij hawm, txhim kho cov kev sib raug zoo zog thiab txo qhov kev pheej hmoo ntawm tawg.
Txhim kho kev tsim kho kev ua haujlwm: Cellulose ether tuaj yeem muab cov khoom ua kom zoo nkauj thiab cov khoom sib tsoo, txo qhov kev tiv thaiv thaum tsim kho, thiab ua kom kev tsim kho yooj yim dua thiab smoother. Nyob rau tib lub sijhawm, nws cov nyhuv thickening tuaj yeem txhim kho qhov fluidity thiab ncua kev kawm ntawm putty, thiab tiv thaiv cov khoom los ntawm sinking thiab delamination.
Txhim kho kev sib raug zoo zog: Ib qho kev sib txuas zoo yog tsim los ntawm kev hloov kho cellulose ether thiab cov khoom siv cement hydration, uas yuav pab txhim kho kev sib raug zoo ntawm cov txheej txheem ntawm putty thiab lub hauv paus txheej thiab txhim kho tag nrho cov adhesion.
Cov cuab yeej zoo los tiv thaiv sagging: Cov khoom zoo thixotropic ua rau cov tawv nqaij tsis tshua muaj sag thaum lub sij hawm facade tsim, thiab tuaj yeem tsim ib lub tiaj, tuab tuab txheej, txhim kho kev tsim kho thiab cov khoom tiav.
Txhim khu kev ruaj ntseg thiab khaws cia: Hloov kho cellulose ether tuaj yeem cuam tshuam qhov stratification, nag lossis daus, thiab agglomeration ntawm putty thaum thauj thiab khaws cia, thiab txhim kho kev ruaj ntseg ntawm cov khoom.
3. Kev hloov kho txoj hauv kev thiab kev ua haujlwm zoo
Cov kev hloov kho feem ntau suav nrog kev qhia cov pab pawg hydrophobic, hloov cov qib ntawm kev hloov pauv, thiab tswj cov khoom hnyav molecular. Piv txwv li, kev hloov pauv hydrophobically HPMC (xws li HPMC-M) tuaj yeem txhim kho cov dej tsis kam thiab cov txheej tuab ntawm putty, thiab los ntawm kev tswj cov tshuaj tiv thaiv etherification, cov khoom uas muaj qhov tshwj xeeb gel kub thiab rheological tus cwj pwm tuaj yeem tau txais los ua kom tau raws li kev tsim kho ntawm cov huab cua sib txawv thiab lub hauv paus.
Kuj tseem muaj cov khoom tshwj xeeb cellulose ether tsim rau kev siv sib txawv, xws li kub gel HPMC haum rau kev tsim kho kub, tsis muaj viscosity thiab dej siab HPMC, thiab lwm yam, kom tau raws li kev lag luam sib txawv thiab cov txheej txheem.
4. Ceev faj rau kev siv
Nyob rau hauv tus txheej txheem ntawm putty formula tsim thiab ntau lawm, cov ntsiab lus hauv qab no yuav tsum tau muab sau tseg thaum siv hloov cellulose ether:
Tswj qhov sib ntxiv, feem ntau 0.2% mus rau 0.5% ntawm qhov hnyav ntawm cov hmoov qhuav qhuav; ntau dhau tuaj yeem cuam tshuam rau lub sijhawm ziab thiab kev ua haujlwm txheej tom ntej.
Kev sib xyaw ua ntej qhuav yuav tsum tsis sib xws thiab tom qab ntawd nplawm nrog dej kom ntseeg tau tias cellulose ether tau tawg tag nrho thiab tsis muaj pob.
Xaiv cov khoom tsim nyog ntawm cellulose ether raws li kev tsim kho ib puag ncig (xws li kub, av noo) thiab hom putty (sab hauv phab ntsa, sab nrauv phab ntsa, hom dej tsis zoo, thiab lwm yam).
Raws li kev ua haujlwm ntxiv nrog kev ua haujlwm zoo,hloov cellulose etherplays lub luag haujlwm tseem ceeb hauv kev tsim khoom thiab kev siv ntawm putty. Nws tsis tsuas yog txhim kho qhov yooj yim ntawm kev tsim kho thiab lub cev ntawm putty, tab sis kuj muab kev txhim khu kev qha thiab muaj txiaj ntsig zoo rau kev kho phab ntsa. Nrog rau kev nce qib ntawm lub tsev ntsuab thiab cov tswv yim tsim kho zoo, qhov kev thov rau kev ua haujlwm siab putty yog loj hlob, thiab daim ntawv thov kev cia siab ntawm kev hloov kho cellulose ether hauv thaj chaw ntawm cov khoom siv hauv tsev yuav dav dua.
Post lub sij hawm: May-15-2025