Hydroxyethyl Cellulose (HEC) hauv Kev Tsim Kho: Ib Daim Ntawv Qhia Ua Ntej

1. Taw qhia rau Hydroxyethyl Cellulose (HEC)

Hydroxyethyl Cellulose(HEC) yog non-ionic, dej-soluble polymer muab los ntawm cellulose, ib tug natural polysaccharide pom nyob rau hauv cov nroj tsuag cell phab ntsa. Los ntawm kev hloov kho tshuaj, pawg hydroxyl hauv cellulose yog hloov nrog hydroxyethyl pawg, txhim kho nws cov solubility thiab ruaj khov hauv cov tshuaj aqueous. Qhov kev hloov pauv no ua rau HEC muaj ntau yam ntxiv hauv cov ntaub ntawv tsim kho, muab cov khoom tshwj xeeb xws li tuav dej, thickening, thiab txhim kho kev ua haujlwm.

1.1 Chemical Structure thiab Production

HECyog synthesized los ntawm kev kho cellulose nrog ethylene oxide nyob rau hauv alkaline tej yam kev mob. Qhov degree ntawm kev hloov pauv (DS), feem ntau nyob nruab nrab ntawm 1.5 thiab 2.5, txiav txim siab tus naj npawb ntawm hydroxyethyl pawg ib chav tsev piam thaj, cuam tshuam rau solubility thiab viscosity. Cov txheej txheem ntau lawm suav nrog alkalization, etherification, neutralization, thiab ziab, ua rau cov hmoov dawb los yog dawb dawb.

2. Cov khoom ntawm HEC ntsig txog kev tsim kho

2.1 Kev tuav dej

HEC tsim cov tshuaj colloidal hauv dej, tsim cov yeeb yaj kiab tiv thaiv ib puag ncig cov khoom. Qhov no slows dej evaporation, tseem ceeb heev rau cement hydration thiab tiv thaiv kom qhuav ntxov ntxov nyob rau hauv mortars thiab plasters.

2.2 Thickening thiab viscosity tswj

HEC tsub kom cov viscosity ntawm cov khoom sib tov, muab sag kuj nyob rau hauv ntsug daim ntaub ntawv xws li pobzeb adhesives. Nws tus cwj pwm pseudoplastic kom yooj yim ntawm daim ntawv thov nyob rau hauv kev nyuaj siab shear (xws li, troweling).

2.3 Compatibility thiab Stability

Raws li ib tug non-ionic polymer, HEC tseem nyob ruaj khov nyob rau hauv high-pH ib puag ncig (xws li, cementitious systems) thiab tolerates electrolytes, tsis zoo li ionic thickeners xws li Carboxymethyl Cellulose (CMC).

2.4 Thermal stability

HEC tswj kev ua haujlwm thoob plaws qhov kub thiab txias, ua rau nws tsim nyog rau cov ntawv thov sab nrauv raug rau cov huab cua sib txawv.

3. Daim ntawv thov ntawm HEC hauv Kev Tsim Kho

3.1 Pobzeb Adhesives thiab Grouts

HEC (0.2-0.5% los ntawm qhov hnyav) ncua sij hawm qhib, tso cai rau kev hloov kho pobzeb yam tsis muaj kev cuam tshuam adhesion. Nws txhim kho daim ntawv cog lus lub zog los ntawm kev txo cov dej nqus mus rau hauv cov txheej txheem ntxeem tau.

3.2 Cement-based mortars thiab Renders

Hauv renders thiab kho mortars, HEC (0.1-0.3%) txhim kho kev ua haujlwm, txo qhov tawg, thiab ua kom zoo zoo. Nws cov dej tuav yog qhov tseem ceeb rau kev siv lub txaj nyias.

3.3 Gypsum khoom

HEC (0.3-0.8%) nyob rau hauv gypsum plasters thiab sib koom ua ke tswj kev teem sij hawm thiab txo qhov shrinkage tawg. Nws txhim khu kev sib kis thiab ua kom tiav.

3.4 Xim thiab Txheej

Nyob rau hauv cov xim sab nrauv, HEC ua raws li lub thickener thiab rheology hloov kho, tiv thaiv drips thiab xyuas kom meej txawm tias kev pab them nqi. Nws kuj stabilizes pigment dispersion.

3.5 Tus kheej-Leveling Compounds

HEC muab viscosity tswj, ua rau nws tus kheej-leveling pem teb kom ntws zoo thaum tiv thaiv particle sedimentation.

3.6 Sab nrauv rwb thaiv tsev thiab Finish Systems (EIFS)

HEC txhim kho qhov adhesion thiab durability ntawm polymer-hloov puag lub tsho hauv EIFS, tiv taus huab cua thiab kev ntxhov siab.

4. Cov txiaj ntsig ntawmHEC hauv Kev Tsim KhoKhoom siv

• Ua haujlwm tau:Ua kom yooj yim sib xyaw thiab siv.
• Adhesion:Txhim kho daim ntawv cog lus muaj zog hauv cov nplaum thiab txheej txheej.
• Durability:Txo shrinkage thiab tawg.
• Sag Resistance:Qhov tseem ceeb rau kev siv ntsug.
• Nqi Efficiency:Tsawg npaum li cas (0.1-1%) muab kev txhim kho tseem ceeb.

5. Sib piv nrog lwm cov Cellulose Ethers

• Methyl Cellulose (MC):Tsawg ruaj khov nyob rau hauv high-pH ib puag ncig; gels ntawm qhov kub thiab txias.
• Carboxymethyl Cellulose (CMC):Ionic xwm txwv kev sib raug zoo nrog cov cement. HEC's non-ionic qauv muab kev siv dav dua.

6. Kev txiav txim siab

6.1 Dosage and Mixing

Kev noj tshuaj zoo sib txawv ntawm daim ntawv thov (piv txwv li, 0.2% rau cov nplais nplaum vs. 0.5% rau gypsum). Ua ntej sib xyaw HEC nrog cov khoom xyaw qhuav tiv thaiv clumping. High-shear mixing kom zoo dispersion.

6.2 Environmental Factors

• Kub:Cov dej txias ua rau kom tawg; dej sov (≤40 ° C) ceev nws.
• pH:Stable nyob rau hauv pH 2-12, zoo tagnrho rau alkaline siv cov ntaub ntawv.

6.3 Cia khoom

Khaws rau hauv qhov chaw txias, qhuav kom tsis txhob ya raws thiab nqus.

7. Kev sib tw thiab kev txwv

• Tus nqi:Siab dua MC tab sis ncaj ncees los ntawm kev ua tau zoo.
• Kev siv ntau dhau:Cov viscosity ntau dhau tuaj yeem cuam tshuam kev thov.
• Retardation:Tej zaum yuav ncua kev teeb tsa yog tias tsis sib npaug nrog cov accelerators.

8. Case Studies

• High-Rise Pobzeb Installation:HEC-raws li cov nplaum nplaum tau qhib lub sijhawm qhib rau cov neeg ua haujlwm hauv Dubai's Burj Khalifa, kom ntseeg tau tias qhov chaw nyob hauv qhov kub thiab txias.
• Restoric Building Restoration:HEC-hloov mortars khaws cia kev ncaj ncees nyob rau hauv cov teb chaws Europe lub cathedral restoration los ntawm txuam cov ntaub ntawv keeb kwm.

9. Yav tom ntej Trends thiab Innovations

• Eco-Friendly HEC:Kev loj hlob ntawm cov qib biodegradable los ntawm cov khoom siv cellulose ruaj khov.
• Hybrid Polymers:Ua ke HEC nrog hluavtaws polymers rau txhim khu kev ua kom tawg.
• Ntse Rheology:Kub-responsive HEC rau adaptive viscosity nyob rau hauv huab cua huab cua.

HEC's multifunctionality ua rau nws indispensable nyob rau hauv niaj hnub kev tsim kho, ntsuas kev ua tau zoo, nqi, thiab sustainability. Raws li kev tsim kho tshiab txuas ntxiv mus, HEC yuav ua lub luag haujlwm tseem ceeb hauv kev ua kom cov khoom siv ruaj khov thiab muaj txiaj ntsig zoo.