Kev tsim kho tej yaam num koom nrog kev sib dhos ntawm cov ntaub ntawv los tsim cov hom phiaj sib txawv, xws li cov vaj tsev nyob mus rau cov phiaj xwm vaj tse. Lub neej ntev thiab kav ntev ntawm cov qauv no yog qhov tseem ceeb rau kev ua kom muaj kev nyab xeeb, txo cov nqi tu thiab txhawb kev txhim kho kom ruaj khov. Hydroxypropyl methylcellulose (HPMC) tau dhau los ua cov khoom siv muaj txiaj ntsig zoo uas txhim kho lub zog ntawm ntau yam khoom siv hauv tsev.
Kawm txog Hydroxypropyl Methylcellulose (HPMC):
HPMC yog hloov kho cellulose ether muab los ntawm ntuj cellulose. Nws yog tsim los ntawm kev kho cellulose nrog propane oxide thiab methyl chloride. Cov txiaj ntsig polymer muaj cov khoom tshwj xeeb uas ua rau nws haum rau ntau yam kev siv, suav nrog cov qauv.
1.Cov yam ntxwv tseem ceeb ntawm HPMC suav nrog:
A. Kev tuav dej: HPMC muaj cov khoom tuav zoo heev, tso cai rau nws tswj cov dej noo zoo ib yam hauv cov khoom siv hauv tsev. Qhov no yog qhov tseem ceeb rau kev hydration ntawm cov cement thiab lwm yam binders, yog li ua kom pom kev txhim kho lub zog zoo.
b. Txhim kho kev ua haujlwm: Ntxiv HPMC rau cov khoom siv hauv tsev txhim kho lawv cov kev ua haujlwm, ua rau lawv yooj yim rau kev tuav, pwm thiab zoo li qub. Qhov no ua rau muaj kev ua tau zoo ntawm cov txheej txheem tsim kho thiab ua rau tag nrho cov khoom zoo kawg nkaus.
C. Adhesion: HPMC ua raws li kev sib khi, txhawb kev adhesion ntawm cov khoom siv hauv tsev. Qhov no txhim kho cov khoom sib koom ua ke, ua kom nws lub zog thiab durability.
d. Rheology Hloov Kho: HPMC ua raws li kev hloov kho rheology, cuam tshuam qhov ntws thiab deformation ntawm cov khoom siv hauv tsev. Qhov no tshwj xeeb tshaj yog muaj txiaj ntsig zoo hauv kev siv xws li mortars thiab pob zeb, qhov twg tswj rheology pab txhawb kev ua haujlwm zoo dua.
2. Kev siv HPMC hauv kev tsim kho:
HPMC pom ntau daim ntawv thov hauv kev tsim kho kev lag luam, thiab muab tso rau hauv ntau yam ntaub ntawv tuaj yeem txhim kho lawv cov kav ntev. Qee cov ntawv thov tseem ceeb suav nrog:
A. mortars thiab Stucco: HPMC feem ntau ntxiv rau cov mortars thiab mortars los txhim kho lawv cov kev ua haujlwm, adhesion thiab dej tuav. Cov khoom no pab tsim kom muaj kev sib raug zoo ntawm cov khoom siv thiab cov khoom siv substrate, uas txo qhov kev pheej hmoo ntawm kev tawg thiab ua kom tag nrho cov kav ntev.
b. Cement-raws li cov ntaub ntawv: Hauv cov ntaub ntawv cementitious xws li pob zeb, HPMC ua tus neeg saib xyuas dej, txhim kho cov txheej txheem dej thiab kev txhim kho tag nrho. Nws kuj tseem pab txo qis cov kab nrib pleb, yog li ua kom cov kav ntev ntawm cov pob zeb ua vaj tse.
C. Pobzeb Adhesives thiab Grouts: HPMC yog dav siv hauv pobzeb nplaum thiab grouts los txhim kho lawv daim ntawv cog lus lub zog thiab yoog raws. Qhov no yog qhov tseem ceeb los tiv thaiv cov vuas los ntawm kev tshem tawm, ua kom muaj kev sib txuas ntev ntev thiab txo cov kev tu ncua.
d. Self-Grading Compound: HPMC tau muab tso rau hauv qhov sib xyaw ua ke ntawm tus kheej kom ua tau raws li qhov xav tau ntws thiab tswj cov tuab tuab. Daim ntawv thov no muaj ntau nyob rau hauv cov phiaj xwm hauv pem teb qhov twg cov theem saum npoo yog qhov tseem ceeb rau kev ua kom ntev thiab zoo nkauj.
e. Sab nrauv Rwb thaiv tsev thiab Finishing Systems (EIF): HPMC yog siv hauv EIF los txhim kho cov khoom sib txuas ntawm cov primer thiab ua kom cov kav ntev ntawm tag nrho cov kab ke. Nws kuj tseem txhawb nqa dej tsis kam, tiv thaiv cov qauv hauv qab los ntawm kev puas tsuaj los ntawm kev ya raws.
3.Lub tshuab ntawm HPMC qhov kev pab cuam rau kev ua haujlwm ntev:
To taub yuav ua li cas HPMC txhim kho lub zog ntawm cov khoom siv hauv tsev yog qhov tseem ceeb rau kev ua kom lawv siv tau zoo. Ob peb lub tswv yim pab txhim kho cov khoom ntawm cov khoom uas muaj HPMC:
A. Moisture Retention: Cov dej noo khaws cia ntawm HPMC kom ntseeg tau tias cov dej noo zoo ib yam yog khaws cia thaum lub sij hawm hydration txheej txheem ntawm cov khoom nplaum. Qhov no ua rau muaj dej tiav ntau dua, uas ua rau kom muaj zog thiab kav ntev.
b. Txhim kho adhesion: HPMC ua raws li kev sib khi, txhawb kev sib txuas ntawm cov khoom siv hauv tsev. Qhov no yog qhov tseem ceeb tshwj xeeb los tiv thaiv delamination thiab txhim kho tag nrho cov cohesion ntawm cov khoom.
C. Txo cov shrinkage: Kev koom ua ke ntawm HPMC hauv cov ntaub ntawv cement-based pab tswj kom qhuav shrinkage, txo qhov yuav ua rau tawg. Qhov no yog qhov tseem ceeb rau lub sijhawm ntev ntawm cov qauv, tshwj xeeb tshaj yog nyob rau hauv ib puag ncig uas muaj qhov sib txawv ntawm qhov kub thiab txias.
d. Txhim Kho Kev Ua Haujlwm: Txhim kho kev ua haujlwm ntawm cov ntaub ntawv uas muaj HPMC tso cai rau kev tso chaw yooj yim dua thiab compaction. Kev cog lus kom raug yog qhov tseem ceeb rau kev ua tiav qhov xav tau qhov ntom ntom, uas ua rau muaj kev ua haujlwm ntev ntawm cov khoom kawg.
e. Tswj Rheology: HPMC ua raws li kev hloov kho rheology, cuam tshuam cov yam ntxwv ntawm cov khoom siv hauv tsev. Kev tswj rheology yog ib qho tseem ceeb hauv kev siv xws li pob zeb, qhov twg yog qhov txaus kom muaj kev sib faib thiab kev sib cog lus, pab txhim kho cov kav ntev.
4. Case Study:
Txhawm rau hais txog qhov ua tau zoo ntawm HPMC hauv kev txhim kho lub zog, qee qhov kev tshawb fawb tuaj yeem raug tshuaj xyuas. Cov kev tshawb fawb no tuaj yeem ua rau pom qhov cuam tshuam zoo ntawm HPMC ntawm kev ua haujlwm ntev, txo tus nqi kho, thiab txhim kho kev ua haujlwm hauv kev nyuaj ib puag ncig.
A. Case Study 1: High Performance Concrete in Choice Construction
Hauv kev tsim kho choj, kev ua haujlwm siab ua vaj tse uas muaj HPMC tau siv. Cov dej tuav cov khoom ntawm HPMC tso cai rau lub sijhawm ntev hydration ntawm cov cement hais, ua rau cov pob zeb sib xyaw nrog txhim kho compressive zog thiab txo permeability. Kev tswj hwm rheology muab los ntawm HPMC pab txhawb kev ua haujlwm zoo ntawm cov duab nyuaj, yog li ua rau lub zog tag nrho ntawm tus choj qauv.
b. Case Study 2: Exterior Insulation and Finishing Systems (EIF) rau Lub Tsev Siv Hluav Taws Xob
Siv HPMC's EIF raws li cov txheej txheem sab nrauv cladding nyob rau hauv ib txoj haujlwm tsim hluav taws xob. Cov khoom nplaum ntawm HPMC ua kom muaj kev sib raug zoo ntawm cov ntaub ntawv rwb thaiv tsev thiab cov substrate, thaum nws muaj peev xwm tuav tau noo noo tiv thaiv kom qhuav ntxov ntxov ntawm primer. Qhov no ua rau lub neej ntev ntawm EIF, tiv thaiv lub tsev lub hnab ntawv thiab txhim kho lub zog ntawm lub sijhawm.
C. Case Study 3: Pobzeb Adhesives nyob rau hauv cov chaw tsheb loj
Nyob rau hauv ib txoj haujlwm ua lag luam loj, cov nplais nplaum nplaum uas muaj HPMC tau siv. Kev txhim kho adhesion muab los ntawm HPMC ua rau muaj kev sib raug zoo ntev ntawm cov pobzeb thiab cov substrate, txo cov kev pheej hmoo ntawm cov pobzeb detachment nyob rau hauv qhov chaw siab. Cov dej tuav cov khoom ntawm HPMC kuj pab txhawb lub sijhawm qhib ntev dua, tso cai rau kev tso cov pobzeb meej thiab txo qhov yuam kev thaum lub sijhawm teeb tsa.
5. Cov kev sib tw thiab kev txiav txim siab:
Txawm hais tias HPMC muab ntau yam txiaj ntsig rau kev txhim kho kev ua haujlwm ntev ntawm kev tsim kho, qee qhov kev sib tw thiab kev txiav txim siab yuav tsum tau txiav txim siab:
A. Kev sib raug zoo: HPMC kev sib raug zoo nrog lwm cov khoom siv ntxiv thiab cov khoom siv tsim kho yuav tsum tau ua tib zoo soj ntsuam kom ua tau zoo. Cov teeb meem sib raug zoo yuav tshwm sim uas cuam tshuam rau tag nrho cov txiaj ntsig ntawm HPMC hauv nws daim ntawv thov.
b. Dose Optimization: HPMC ntau npaum li cas yog qhov tseem ceeb kom ua tiav cov khoom xav tau hauv cov khoom siv hauv tsev. Kev siv ntau dhau tuaj yeem ua rau muaj kev cuam tshuam tsis zoo xws li ncua sij hawm teem sijhawm, thaum underdosing tuaj yeem ua rau kev txhim kho tsis txaus ntawm kev ua haujlwm ntev.
C. Ib puag ncig tej yam kev mob: HPMC kev ua tau zoo yuav raug cuam tshuam los ntawm ib puag ncig tej yam kev mob xws li kub thiab av noo. Kev tsim kho tej yaam num nyob rau hauv huab cua huab cua tej zaum yuav xav tau formulation kho kom account rau cov kev hloov nyob rau hauv tej yam kev mob.
d. Kev Tswjhwm Zoo: Kev ntsuas nruj nruj yuav tsum tau ua kom ntseeg tau tias HPMC cov khoom thiab kev ua tau zoo sib xws. Kev hloov pauv hauv HPMC qhov zoo tuaj yeem cuam tshuam tag nrho cov khoom siv hauv tsev.
Post lub sij hawm: Jan-16-2024