Methyl Hydroxyethyl Cellulose (MHEC) yaj hauv cov av ntub

Methyl Hydroxyethyl Cellulose (MHEC)yog ib qho non-ionic cellulose ether uas siv dav hauv cov ntaub ntawv siv hauv kev tsim kho, tshwj xeeb tshaj yog hauv cov av ntub, thiab ua lub luag haujlwm tseem ceeb. Nws cov dej solubility thiab cov qauv molecular siab ua rau nws tsim cov kua nplaum hauv dej, muab cov av zoo heev rau kev ua cov khoom siv, khaws dej thiab hloov kho tau.

1. Cov yam ntxwv tseem ceeb ntawm MHEC

MHEC yog ib qho cellulose ether derivative ua los ntawm kev qhia methyl thiab hydroxyethyl pawg rau hauv cellulose ntuj los ntawm kev sib xyaw ua ke. Nws muaj cov dej yaj zoo, cov khoom tsim zaj duab xis, khaws dej thiab lo rau. Nws ruaj khov nyob rau hauv cov xwm txheej nruab nrab thiab alkaline thiab muaj kev sib raug zoo ntawm biocompatibility thiab kev nyab xeeb ib puag ncig.

MHEC yaj tau hauv dej txias ntawm chav tsev kub kom ua tau cov kua colloidal pob tshab mus rau pob tshab, thiab tsis yaj hauv dej kub lossis feem ntau cov kuab tshuaj organic. Nws cov txheej txheem yaj yog cov txheej txheem nthuav dav-kev tawg-kev yaj, thiab tsis muaj kev cuam tshuam tshuaj lom neeg.

2. Cov txheej txheem yaj ntawm MHEC hauv cov av ntub

Hauv cov mortar ntub, MHEC feem ntau yog ntxiv rau hauv cov hmoov qhuav, thiab tom qab ntawd maj mam yaj thaum lub sijhawm ntxiv dej thiab do:

Theem pib - kev nqus dej thiab o: Cov khoom me me MHEC nqus dej thiab o rau ntawm qhov chaw tom qab kov dej, tsim cov txheej gel.

Theem Nruab Nrab - kev tawg thiab o: Nrog rau qhov kev sib xyaw, ib feem ntawm cov qauv colloidal raug rhuav tshem, thiab MHEC pib tawg mus rau hauv tag nrho lub cev.

Theem kawg - kev yaj tag nrho: Tom qab sib xyaw tas li thiab ib lub sijhawm, MHEC yaj tag nrho los ua cov tshuaj polymer ruaj khov, uas tau faib sib npaug hauv cov mortar.

Hauv kev siv tiag tiag, qhov nrawm ntawm kev yaj ntawm MHEC yuav raug cuam tshuam los ntawm qhov sib xyaw ua ke, qhov kub ntawm dej, qhov loj ntawm cov khoom me me, thiab lwm yam khoom siv hauv cov mis (xws li cement, gypsum, xuab zeb, thiab lwm yam). Kev tswj hwm cov kev ntsuas no kom zoo tuaj yeem zam qhov teeb meem ntawm kev sib sau ua ke lossis kev yaj tsis tiav.

3. Lub luag haujlwm tseem ceeb ntawm MHEC hauv cov khib nyiab ntub dej

3.1. Txhim kho kev khaws dej kom zoo

Qhov cuam tshuam tseem ceeb tshaj plaws ntawm MHEC yog los txhim kho lub peev xwm khaws dej ntawm cov mortar, txo qhov kev ua kom sai ntawm cov dej dawb, ua kom lub sijhawm ua kom cov cement hydration ntev dua, yog li txhim kho lub zog thiab lub zog ntawm kev sib txuas, thiab tiv thaiv kev tawg ntxov.

3.2. Txhim kho kev ua haujlwm ntawm kev tsim kho

Vim yog qhov ua kom lubricity thiab thickening ntawm MHEC, cov mortar muaj kev ua haujlwm zoo, kev ywj pheej thiab kev nthuav dav, txo qhov nyuaj ntawm kev tsim kho thiab txhim kho kev ua haujlwm. Tshwj xeeb tshaj yog nyob rau hauv cov txheej txheem ntawm plastering thiab tiling, nws tuaj yeem tiv thaiv cov mortar kom tsis txhob poob thiab swb.

3.3. Txhim kho kev ua haujlwm ntawm kev sib txuas

Cov qauv sib txuas ua ke uas MHEC tsim nyob rau hauv cov mortar ua rau lub zog sib txuas ntawm cov mortar thiab txheej hauv paus zoo dua, tshwj xeeb tshaj yog thaum tsim kho ntawm qhov chaw ntsug lossis saum toj kawg nkaus, ua rau cov mortar tsis txhob poob thiab ua kom muaj kev ntseeg siab rau kev tsim kho.

3.4. Kho qhov sib xws thiab kev ntws dej

Los ntawm kev kho qhov ntau ntawm MHEC, qhov sib xws thiab tus cwj pwm rheological ntawm cov mortar ntub tuaj yeem tswj tau, yog li nws muaj cov kua dej kom zoo, uas yooj yim rau kev tsim kho, thiab yuav tsis cuam tshuam rau cov nyhuv molding vim muaj dej ntws ntau dhau.

3.5. Txhim kho kev ua haujlwm tiv thaiv kev plam

Hauv cov ntawv thov xws li cov nplaum rau pobzeb thiab cov nplaum sib txuas, MHEC tuaj yeem tiv thaiv cov nplaum sib tsoo, txhim kho qhov ruaj khov ntawm kev tsim kho, thiab ua tau raws li qhov yuav tsum tau ua ntawm kev nplaum ntsug thiab cov pobzeb loj.

4. Cov nyhuv ntawm MHEC koob tshuaj rau kev ua haujlwm ntawm cov mortar

Feem ntau, qhov ntxiv ntawm MHEC raug tswj ntawm 0.1% thiab 0.5% (raws li tag nrho cov khoom qhuav). Cov teebmeem ntawm cov tshuaj sib txawv rau kev ua haujlwm ntawm cov mortar yog raws li nram no:

Cov tshuaj tsawg (<0.1%): kev khaws dej tau zoo me ntsis, tab sis kev txhim kho hauv kev ua haujlwm ntawm kev tsim kho tsis pom tseeb.

Kev siv tshuaj nruab nrab (0.2% ~ 0.4%): Kev ua tau zoo tshaj plaws, kev txhim kho kev khaws dej kom zoo, kev ua haujlwm ntawm kev tsim kho, thiab lub zog sib txuas.

Siv ntau dhau (> 0.5%): Nws yuav ua rau cov mortar tuab dhau, txo qhov fluidity, thiab ntev lub sijhawm teeb tsa.

Yog li ntawd, hauv kev tsim cov mis tshwj xeeb, nws yog qhov tsim nyog los txiav txim siab qhov ntau ntxiv zoo tshaj plaws ntawm MHEC los ntawm kev sim kom ua tiav qhov txiaj ntsig zoo tshaj plaws.

5. Kev sib koom tes nrog lwm cov khoom siv ntxiv

MHEC siv tau ua ke nrog ntau yam khoom siv ntxiv, xws li:

Nrog cov hmoov latex uas tawg tau dua (VAE): ua ke txhim kho qhov yooj ywm thiab lub zog sib txuas ntawm cov mortar;

Nrog cov tshuaj tiv thaiv: ncua kev ua kom cov cement noo, koom tes nrog MHEC los txhim kho lub qhov rais kev tsim kho;

Nrog cov khoom sau/cov pob zeb hauv av: sib koom ua ke qhov fluidity thiab kev txhim kho lub zog, ruaj khov cov qauv mortar.

Ua ib qho khoom siv tseem ceeb hauv cov av ntub,hydroxyethyl methylcellulose (MHEC) ua ntau lub luag haujlwm hauv kev ua kom tuab, kev khaws dej, kev txhim kho thiab kev txhim kho kev tsim kho hauv lub cev mortar los ntawm nws cov khoom zoo uas yaj tau hauv dej. Nws yog ib qho khoom siv ua haujlwm siab uas tsis tuaj yeem tsis tau hauv cov ntaub ntawv tsim kho niaj hnub. Los ntawm kev xaiv cov qauv thiab cov koob tshuaj, MHEC tuaj yeem txhim kho kev ua haujlwm ntawm mortar, ua tau raws li qhov xav tau ntawm ntau yam kev tsim kho, thiab pab kev tsim kho ntsuab thiab ua haujlwm tau zoo.