HPMC (uas yog, hydroxypropyl methylcellulose) yog cov khoom tseem ceeb hauv kev tsim cov nplais nplaum. Nws txhim khu lub adhesion, workability thiab dej tuav ntawm pobzeb adhesives. Hauv tsab xov xwm no, peb yuav muab koj cov lus qhia dav dav rau kev siv HPMC hauv cov ntawv nplaum nplaum.
1. Taw qhia rau HPMC
HPMC yog ib qho non-ionic cellulose ether tau los ntawm kev hloov cov cellulose ntuj. Cov txheej txheem tsim khoom suav nrog kev kho cellulose nrog alkali kom yaj nws, tom qab ntawd ntxiv methyl chloride thiab propylene oxide los hloov nws. Qhov tshwm sim yog cov hmoov dawb los yog dawb dawb uas yooj yim soluble hauv dej.
2. Cov yam ntxwv ntawm HPMC
HPMC yog cov khoom siv ntau yam polymer nrog ntau yam khoom zoo. Qee qhov ntawm nws cov yam ntxwv tseem ceeb suav nrog:
- Kev tuav dej zoo heev
- siab adhesion
- Txhim kho machinability
- Txhim kho sag kuj
- Txhim kho plam tsis kam
- zoo mob
- Txhim kho cov sijhawm qhib
3. Qhov zoo ntawm HPMC hauv daim ntawv thov pobzeb nplaum
Thaum siv cov pobzeb nplaum ntau lawm, HPMC muaj ntau yam zoo xws li:
- Kev tuav dej zoo dua rau kev txhim kho pobzeb nplaum ua haujlwm hauv cov chaw ntub dej
- Txhim kho cov khoom nplaum kom ntseeg tau tias cov vuas tau ruaj khov rau hauv qhov chaw
- Txhim kho machinability ua kom yooj yim ntawm daim ntawv thov thiab txo cov kev siv zog uas yuav tsum tau ua kom tiav qhov chaw du
- Txo qhov shrinkage thiab sagging, txhim kho qhov zoo nkauj ntawm cov nplais pobzeb
- Txhim kho qhov sib xws ntawm cov pobzeb nplaum, txhawb nqa txawm tias daim ntawv thov raug
- Txhim kho txoj hlua khi kom muaj kev nyab xeeb ntxiv ntawm cov nplais pobzeb
4. Kev siv HPMC hauv daim ntawv thov pobzeb Adhesive
HPMC yog siv los ua thickener, nplaum, dej tuav tus neeg saib xyuas thiab rheology hloov kho hauv cov ntawv nplaum nplaum. Feem ntau ntxiv ntawm 0.5% - 2.0% (w / w) ntawm tag nrho cov sib tov qhuav. Hauv qab no yog qee qhov tseem ceeb rau kev siv HPMC.
4.1 Kev tuav dej
Lub pobzeb nplaum yuav tsum tau sab laug kom tus installer muaj sijhawm txaus los kho cov pobzeb. Kev siv HPMC muab cov dej khaws cia zoo heev thiab tiv thaiv cov nplaum kom qhuav sai heev. Nws kuj txhais tau tias cov nplaum tsis tas yuav tsum tau rov ua dej, uas tuaj yeem ua rau kev ua haujlwm tsis sib xws.
4.2 Txhim kho adhesion
Cov khoom nplaum ntawm HPMC txhim khu kev ruaj ntseg ntawm cov nplais nplaum nplaum. Nws pab xyuas kom cov pobzeb nyob ruaj ntseg hauv qhov chaw, txawm tias nyob hauv cov chaw tsheb loj lossis qhov chaw ntub dej.
4.3 Machinability
HPMC txhim kho kev ua haujlwm ntawm cov nplais nplaum, ua kom yooj yim rau kev thov thiab ua tiav qhov chaw du. Nws ua rau cov nplaum nplaum yooj yim dua rau zuag, txo qhov kev siv zog uas yuav tsum tau thawb cov nplaum rau saum npoo.
4.4 Txo shrinkage thiab sagging
Nyob rau tib lub sijhawm, pobzeb nplaum tuaj yeem ua rau qis lossis sag, ua rau qhov tsis pom kev thiab tsis zoo. Kev siv HPMC txo qis qis thiab sagging, ua kom lub cev zoo nkauj thiab ua kom zoo nkauj.
4.5 Txhim kho plam tsis kam
Slips thiab ntog yog ib qho teeb meem tseem ceeb ntawm cov nplais pobzeb, tshwj xeeb tshaj yog thaum ntub. Kev txhim kho plam kev tiv thaiv ntawm HPMC ua rau cov nplais nplaum siv kev nyab xeeb thiab txo qhov kev pheej hmoo ntawm kev hlais thiab ntog.
5. Yuav Siv HPMC li cas hauv cov ntawv nplaum nplaum nplaum
HPMC feem ntau yog ntxiv ntawm tus nqi ntawm 0.5% - 2.0% (w / w) ntawm tag nrho cov sib tov qhuav. Nws yuav tsum tau ua ntej sib xyaw nrog Portland cement, xuab zeb thiab lwm cov hmoov qhuav thiab lwm yam khoom ntxiv ua ntej ntxiv dej. Hauv qab no yog cov kauj ruam hauv kev siv HPMC hauv daim ntawv thov cov nplaum nplaum.
- Ntxiv cov hmoov qhuav rau hauv lub thawv sib tov.
- Ntxiv HPMC rau cov hmoov sib tov
- Muab cov hmoov sib tov kom txog thaum HPMC sib npaug.
- Maj mam ntxiv dej rau qhov sib tov thaum nplawm tas li kom tsis txhob muaj pob.
- Txuas ntxiv mus kom txog thaum sib tov yog du thiab muaj ib qho sib xws.
6. Cov lus xaus
HPMC yog cov khoom tseem ceeb hauv kev tsim cov nplais nplaum, muab cov txiaj ntsig zoo xws li kev txhim kho adhesion, txhim kho kev ua haujlwm, thiab txo qis thiab sagging. Kev siv HPMC hauv cov ntawv nplaum nplaum yuav tsum muaj kev sib xyaw thiab ntau npaum li cas kom tau txais txiaj ntsig zoo.
Yog li ntawd, peb xav kom siv HPMC hauv kev tsim cov nplais nplaum kom txaus siab rau nws qhov zoo thiab txhim kho qhov zoo ntawm cov khoom tiav.
Post lub sij hawm: Lub Xya hli ntuj-19-2023