Cellulose ethers yog ib qho tseem ceeb ntawm cov khoom siv ntxiv, uas tau siv dav hauv kev tsim cov khoom siv los txhim kho cov khoom lag luam. Tshwj xeeb tshaj yog nyob rau hauv cov nplais nplaum, cellulose ethers tuaj yeem txhim kho lawv lub cev thiab tshuaj lom neeg, txhim kho kev tsim kho, thiab txhim kho kev sib raug zoo thiab kev ua haujlwm ntev.
1. Cov khoom tseem ceeb ntawm cellulose ethers
Cellulose ethers yog derivatives tau los ntawm kev hloov kho tshuaj ntawm natural cellulose, thiab cov uas muaj xws li methyl cellulose (MC), hydroxypropyl methyl cellulose (HPMC), hydroxyethyl cellulose (HEC), thiab lwm yam. Nws cov yam ntxwv tseem ceeb yog soluble nyob rau hauv dej, tsim ib tug high-viscosity tov, thiab muaj zoo heev cov khoom thiab thickening. Cov yam ntxwv no ua rau cellulose ethers ua lub luag haujlwm tseem ceeb hauv cov nplaum nplaum.
2. Txhim kho dej tuav
2.1 Qhov tseem ceeb ntawm kev tuav dej
Kev tuav dej ntawm cov nplais nplaum yog qhov tseem ceeb rau kev tsim kho kev ua tau zoo thiab kev sib txuas lub zog. Kev tuav dej zoo tuaj yeem ua kom ntseeg tau tias cov nplaum muaj cov dej noo tsim nyog thaum lub sijhawm kho, yog li ua kom tiav cov cement hydration. Yog tias cov dej tuav tsis txaus, cov dej tau yooj yim absorbed los ntawm lub substrate los yog ib puag ncig, ua rau cov dej tsis tiav, uas cuam tshuam rau lub zog kawg thiab kev sib txuas ntawm cov nplaum.
2.2 Dej tuav mechanism ntawm cellulose ether
Cellulose ether muaj peev xwm tuav tau dej siab heev thiab tuaj yeem khi ntau cov dej molecules ntawm nws cov saw molecular. Nws lub siab viscosity aqueous tov tuaj yeem tsim cov dej tsis sib xws hauv cov nplaum thiab kaw cov dej los ntawm kev ua haujlwm capillary hauv cov nplaum nplaum los tiv thaiv cov dej los ntawm kev poob sai heev. Lub tshuab tuav dej no tsis yog tsuas yog ua rau cov tshuaj tiv thaiv dej ntawm cov cement, tab sis kuj tuaj yeem txuas ntxiv lub sijhawm qhib ntawm cov nplaum thiab txhim kho kev tsim kho yooj yim.
3. Txhim kho kev tsim kho kev ua haujlwm
3.1 Extension ntawm lub sijhawm qhib
Kev taw qhia ntawm cellulose ether txuas ntxiv lub sijhawm qhib ntawm pobzeb nplaum, uas yog, lub sijhawm ntawm lub sijhawm uas cov nplaum nplaum tseem nplaum tom qab siv rau ntawm qhov chaw substrate. Qhov no ua rau cov neeg ua haujlwm tsim kho ntau lub sijhawm los kho thiab nteg cov vuas, yog li txo qis kev tsim kho los ntawm lub sij hawm siab.
3.2 Enhanced anti-sagging kev ua tau zoo
Thaum lub sij hawm tsim kho, cov nplaum yuav sag vim lub ntiajteb txawj nqus tom qab cov vuas raug tso, tshwj xeeb tshaj yog thaum thov rau ntawm ntsug. Cov nyhuv thickening ntawm cellulose ether tuaj yeem txhim kho cov cuab yeej tiv thaiv sagging ntawm cov nplaum, kom ntseeg tau tias nws tsis swb thaum adhering rau cov vuas. Cov cuab yeej no tseem ceeb tshwj xeeb rau kev ua kom qhov tseeb thiab kev zoo nkauj tag nrho ntawm cov pobzeb tso.
3.3 Txhim kho lubricity thiab kev ua haujlwm
Lubricity ntawm cellulose ether txhim kho kev ua haujlwm ntawm cov nplais nplaum, ua rau lawv yooj yim dua rau kev thov thiab flatten. Cov cuab yeej no pab txo qhov nyuaj thiab lub sijhawm ntawm kev tsim kho thiab txhim kho kev tsim kho kom zoo.
4. Txhim khu kev ruaj ntseg
4.1 Txhim kho thawj adhesion
Cov tshuaj viscosity siab tsim los ntawm cellulose ether hauv cov tshuaj aqueous tuaj yeem ua rau muaj qhov sib ntxiv ntawm cov pobzeb nplaum, muab cov adhesion tam sim ntawd thaum tso cov vuas thiab zam cov pobzeb zawv zawg lossis dislocation.
4.2 Txhawb cov cement hydration
Cov dej tuav tau zoo ntawm cellulose ether ua kom muaj cov tshuaj tiv thaiv tag nrho ntawm cov cement, yog li tsim cov khoom siv dej ntau (xws li hydrated calcium silicate), uas txhim kho lub zog sib txuas ntawm cov nplaum. Cov txheej txheem no tsis tsuas yog txhim kho lub zog txhua yam ntawm cov nplaum, tab sis kuj txhim kho nws cov kav ntev thiab tawg tsis kam.
5. Txhim kho durability thiab tawg tsis kam
5.1 Txhim kho khov-thaw tsis kam
Cellulose ethers txhim kho qhov khov-thaw tsis kam ntawm cov nplais nplaum los ntawm kev txhim kho cov dej tuav thiab kev cog lus ntawm cov nplais nplaum, txo qis kev tsiv teb tsaws sai thiab poob dej. Qhov kev txhim kho no tso cai rau cov nplaum ua kom ruaj khov txawm tias nyob hauv qhov chaw txias txias thiab tsis tshua muaj kev tawg lossis tawg.
5.2 Txhim kho kev tawg tsis kam
Thaum lub sij hawm kho cov txheej txheem ntawm cov nplaum, cov txheej txheem ntom ntom tsim los ntawm cov cellulose ethers pab ua kom lub ntsws ntawm cov cement thiab txo qhov kev pheej hmoo ntawm kev tawg los ntawm kev ntxhov siab. Tsis tas li ntawd, cov nyhuv thickening ntawm cellulose ethers ua rau cov nplaum ua kom zoo dua qhov sib txawv ntawm cov pobzeb thiab cov substrate, ntxiv dag zog rau kev ruaj ntseg ntawm kev sib txuas lus.
6. Lwm cov haujlwm
6.1 Muab lubrication thiab anti-sagging zog
Lub lubrication ntawm cellulose ethers tsis tsuas yog pab kev khiav hauj lwm kev ua tau zoo, tab sis kuj txo cov sagging tshwm sim ntawm cov nplaum thaum lub sij hawm daim ntawv thov txheej txheem, xyuas kom meej uniformity thiab stability thaum lub sij hawm daim ntawv thov txheej txheem.
6.2 Txhim kho kev tsim kho yooj yim
Los ntawm kev ua kom lub viscosity thiab kev tsim kho lub sij hawm ntawm cov nplaum, cellulose ether txhim kho qhov yooj yim ntawm kev tsim kho, tso cai rau cov neeg ua haujlwm kho cov vuas kom yooj yim dua, txo qis kev tsim kho thiab rov ua haujlwm dua.
7. Daim ntawv thov piv txwv ntawm Cellulose Ether
Hauv kev siv tshwj xeeb, cellulose ether txhim kho qhov zoo ntawm tag nrho qhov project los ntawm kev txhim kho kev ua haujlwm ntawm cov nplais nplaum. Piv txwv li, nyob rau hauv tej qhov kub thiab txias ib puag ncig los yog tsis muaj av noo ib puag ncig, zoo tib yam adhesives tej zaum yuav ntsib teeb meem ntawm cov dej sai sai, uas ua rau muaj teeb meem kev tsim kho thiab tsis muaj zog txaus. Tom qab ntxiv cellulose ether, cov nplaum tuaj yeem tswj xyuas cov dej zoo, zam cov teeb meem no, thiab yog li xyuas kom zoo ntawm qhov project.
Cellulose ether ho txhim kho kev ua tau zoo ntawm cov nplais nplaum los ntawm nws cov dej tuav zoo, thickening thiab lubrication. Nws tsis tsuas yog txhim kho kev tsim kho kev ua tau zoo, kev sib txuas lub zog thiab kev ua haujlwm ntev ntawm cov nplaum, tab sis kuj txhim kho qhov yooj yim thiab kev ntseeg siab ntawm kev tsim kho. Cov kev txhim kho no tsis tsuas yog txhim kho tag nrho cov kev ua tau zoo ntawm qhov project, tab sis kuj muab kev yooj yim dua thiab ruaj khov rau txoj kev tsim kho. Yog li ntawd, raws li ib tug tseem ceeb additive, daim ntawv thov ntawm cellulose ether nyob rau hauv cov pobzeb adhesives muaj ib tug tseem ceeb tswv yim tus nqi thiab dav prospects.
Post lub sij hawm: Jun-24-2024