Cellulose ethers yog ib chav kawm siab molecular hnyav dej-soluble polymers muab los ntawm cellulose. Lawv tau dav siv nyob rau hauv kev tsim kho kev lag luam raws li kev ua tau zoo-txhim kho admixtures rau cement-based thiab gypsum-based khoom. Ntawm lawv, hydroxypropyl methylcellulose (HPMC) yog ib qho tseem ceeb tshaj plaws cellulose ethers rau putty.
Raws li tus kws tshaj lij HPMC cov chaw tsim khoom, peb yuav piav qhia koj lub luag haujlwm ntawm cellulose ether hauv putty. Peb cia siab tias cov ntawv tshaj tawm no muab qee qhov kev nkag siab zoo rau cov neeg nyiam hauv lub ncauj lus no.
1. Kev tuav dej
Ib qho ntawm cov haujlwm tseem ceeb ntawm cellulose ether rau putty yog dej tuav. Putty yog cov khoom siv zoo li siv los sau qhov khoob thiab cov kab nrib pleb hauv cov chaw xws li phab ntsa, qab nthab thiab cov plag tsev. Dej yog ib qho tseem ceeb muaj nyob rau hauv putty formulations vim hais tias nws pab yaj cov khoom xyaw thiab muab workability. Txawm li cas los xij, dej ntau dhau tuaj yeem ua rau cov putty qhuav thiab ntsws sai, ua rau tawg thiab ua tiav tsis zoo.
Cellulose ether, tshwj xeeb tshaj yog HPMC, tsim cov qauv zoo li gel thaum tov nrog dej, uas tuaj yeem txhim kho cov dej tuav ntawm putty. Cov pab pawg hydrophilic ntawm HPMC tuaj yeem nqus cov dej molecules thiab tiv thaiv lawv ntawm evaporating sai heev. Qhov no feature tso cai rau lub sij hawm ua hauj lwm ntev dua thiab ib tug zoo sib xws putty zoo nkauj.
2. Txhim kho kev ua haujlwm
Lwm txoj haujlwm tseem ceeb ntawm cellulose ether rau putty yog los txhim kho nws txoj haujlwm. Workability yog hais txog qhov yooj yim uas cov putty yog thov thiab molded kom tau ib tug du nto. Cellulose ether tuaj yeem txhim kho qhov fluidity thiab kis tau ntawm putty los ntawm kev txo cov kev sib txhuam ntawm cov khoom thiab ua kom lub lubrication ntawm lub cev.
Qhov sib ntxiv ntawm cellulose ethers rau putties kuj txo cov huab cua nkag los ntawm kev sib xyaw, uas tuaj yeem ua rau tsis sib xws ntawm qhov chaw thiab tsis zoo adhesion. Kev siv cov cellulose ethers txhim kho qhov smoothness thiab sib xws ntawm putty, uas ua rau muaj kev ua tau zoo tag nrho thiab ua kom tiav zoo dua.
3. Ua kom adhesion
Lwm qhov txiaj ntsig ntawm cellulose ether rau putty yog nce adhesion. Putties yog siv los sau qhov khoob thiab cov kab nrib pleb, nrog rau tsim kom muaj qhov chaw du rau cov xim lossis lwm yam ua tiav. Yog li ntawd, lub putty yuav tsum muaj peev xwm ua raws li lub substrate thiab muab ib tug muaj zog daim ntawv cog lus.
Cellulose ether, tshwj xeeb tshaj yog HPMC, tuaj yeem txhim kho qhov adhesion ntawm putty los ntawm kev tsim ib zaj duab xis rau saum npoo ntawm substrate. Cov zaj duab xis txhim khu kev sib cuag ntawm putty thiab substrate thiab pab ua kom tiav qhov tsis sib xws. Qhov no ua rau muaj kev sib raug zoo thiab kev ua tiav ntau dua.
4. Txo shrinkage
Shrinkage yog ib qho teeb meem tshwm sim nrog putty, vim nws tuaj yeem ua rau tawg thiab ua tiav tsis zoo. Cellulose ethers tuaj yeem pab txo qis qis qis los ntawm kev txhim kho cov dej tuav thiab kev ua haujlwm ntawm cov putty. Cov dej evaporates qeeb dua, muab cov khoom sib xyaw ua kom zoo nkauj uas pab tiv thaiv cov kab nrib pleb thiab crevices los ntawm kev sib sau thaum ziab.
Tsis tas li ntawd, cellulose ether tuaj yeem txo cov yas shrinkage ntawm putty, uas yog, qhov shrinkage tshwm sim thaum lub sij hawm pib. Cov cuab yeej no yog qhov tseem ceeb tshwj xeeb rau kev teeb tsa sai sai, vim nws pab tswj kev ncaj ncees ntawm qhov chaw thiab tiv thaiv kev tsim cov kab nrib pleb.
5. Txhim khu kev ua haujlwm ntev
Thaum kawg, cellulose ethers tuaj yeem txhim kho lub zog ntawm putty los ntawm kev txhim kho nws cov kev tiv thaiv ib puag ncig xws li kub hloov pauv, av noo thiab puas. Cov yeeb yaj kiab tsim cov khoom ntawm cellulose ether tuaj yeem muab kev tiv thaiv kev tiv thaiv ntawm qhov chaw putty kom tiv thaiv kev nkag mus ntawm dej thiab lwm yam pa phem.
Tsis tas li ntawd, cellulose ether tuaj yeem txhim kho lub zog flexural thiab cuam tshuam tsis kam ntawm putty, ua rau nws tiv taus ntau dua rau kev tawg thiab chipping. Cov cuab yeej no tseem ceeb tshwj xeeb tshaj yog rau cov ntawv thov uas cov khoom siv feem ntau siv los yog cuam tshuam, xws li hauv kev kho vaj tse lossis kev kho kom zoo nkauj.
nyob rau hauv xaus
Hauv kev xaus, cellulose ethers, tshwj xeeb tshaj yog HPMC, yog ib qho tseem ceeb ntawm kev ua tau zoo ntawm cov khoom sib xyaw. Lawv lub luag haujlwm suav nrog kev tuav dej, txhim kho kev ua haujlwm, nce adhesion, txo shrinkage thiab txhim kho durability. Siv cellulose ethers pab txhim kho tag nrho cov khoom zoo thiab kev ua tau zoo ntawm putty, uas ua rau kom tiav tiav thiab lub neej ntev dua. Raws li cov kws tshaj lij HPMC cov chaw tsim khoom, peb tau cog lus los muab cov neeg siv khoom nrog cov khoom lag luam zoo cellulose ether thiab kev txhawb nqa.
Post lub sij hawm: Lub Xya hli ntuj-20-2023