Cellulose ethers Kev ua tau zoo txhim kho rau ob qho tib si mortars thiab xim

Cellulose ethers yog ntau yam additives uas muaj kev txhim kho tseem ceeb rau ob qho tib si drymix mortars thiab xim. Cia peb tshawb xyuas seb cov additives no pab txhim kho cov khoom thiab kev ua haujlwm ntawm txhua qhov:

1. Drymix mortars: Drymix mortars yog cov khoom sib xyaw ua ntej ntawm cov cement, xuab zeb, thiab cov khoom siv ntxiv siv hauv kev tsim kho xws li pobzeb adhesives, grouts, renders, thiab plastering. Cellulose ethers ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm cov tshuaj khib nyiab hauv cov khoom hauv qab no:
   • Kev tuav dej: Cellulose ethers, xws li Hydroxyethyl Methyl Cellulose (HEMC) thiab Hydroxypropyl Methyl Cellulose (HPMC), muaj cov dej tuav zoo heev. Lawv tsim ib zaj duab xis tiv thaiv nyob ib ncig ntawm cov cement hais, ua kom cov evaporation ntawm dej thaum kho. Qhov no txhim kho kev ua haujlwm, ncua sij hawm qhib, thiab txhim kho adhesion, txo qhov kev pheej hmoo ntawm shrinkage tawg thiab ua kom muaj dej kom zoo ntawm cov ntaub ntawv cementitious.
   • Thickening thiab Rheology Control: Cellulose ethers ua cov thickeners thiab rheology modifiers nyob rau hauv drymix mortars, txhim kho qhov sib xws, ntws, thiab sag kuj. Lawv muab tus cwj pwm shear-thinning, ua rau cov mortar yooj yim siv thaum tiv thaiv kev poob qis thaum siv ntsug. Ethyl Hydroxyethyl Cellulose (EHEC) thiab Carboxymethyl Cellulose (CMC) feem ntau yog siv rau lawv cov thickening thiab rheological tswj zog.
   • Adhesion thiab Cohesion: Cellulose ethers txhim khu lub adhesion thiab cohesion ntawm drymix mortars los ntawm kev tsim ib tug saj zawg zog, cohesive zaj duab xis uas bonds zoo rau ntau yam substrates. Qhov no txhim kho daim ntawv cog lus muaj zog, txo qhov kev pheej hmoo ntawm kev sib tsoo lossis delamination, thiab txhim kho tag nrho cov khoom siv dag zog.
   • Crack Resistance thiab Durability: Qhov sib ntxiv ntawm cellulose ethers txhim kho qhov tawg tsis kam thiab ua haujlwm ntev ntawm cov tshuaj khib nyiab los ntawm kev txo qis qis, tswj dej, thiab txhim kho cov cohesion ntawm cov tshuaj khib nyiab. Qhov no ua rau cov khoom siv muaj zog thiab siv tau ntev, muaj peev xwm tiv taus ib puag ncig kev ntxhov siab thiab kev txav ntawm cov qauv.
2. Xim: Cov xim yog cov txheej txheem nyuaj uas muaj cov xim, cov khi, cov kuab tshuaj, thiab cov khoom ntxiv. Cellulose ethers ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm cov xim dej raws li hauv qab no:
   • viscosity Control: Cellulose ethers ua raws li cov thickeners zoo nyob rau hauv cov xim dej, tswj viscosity thiab tiv thaiv sagging los yog poob thaum lub sij hawm thov. Qhov no ua kom muaj kev tiv thaiv zoo ib yam, txhim kho kev txhuam kom zoo, thiab txhim kho cov yeeb yaj kiab tsim rau ntawm qhov chaw ntsug. Hydroxyethyl Cellulose (HEC) thiab Hydroxypropyl Methyl Cellulose (HPMC) feem ntau yog siv rau viscosity tswj hauv cov xim.
   • Stabilization thiab Suspension: Cellulose ethers pab txhawb kom stabilization ntawm cov xim thiab cov muab tso rau hauv cov xim pleev xim, tiv thaiv kev daws teeb meem thiab ua kom muaj kev sib txawv. Qhov no txhim kho cov xim sib xws, txo cov sedimentation, thiab txhim kho lub txee lub neej ntawm cov xim.
   • Flow thiab Levelling: Qhov sib ntxiv ntawm cellulose ethers txhim kho qhov ntws thiab qib ntawm cov xim dej, uas ua rau kom du, txawm tias ua tiav nrog cov txhuam me me lossis cov menyuam stipple. Qhov no txhim kho qhov kev zoo nkauj ntawm txoj haujlwm xim thiab txo qhov xav tau ntawm kev npaj nto.
   • Zaj duab xis tsim thiab Durability: Cellulose ethers pab tsim ib tug nruam, cohesive zaj duab xis ntawm lub substrate, txhim kho adhesion, abrasion resistance, thiab weatherability ntawm cov xim. Qhov no txhim kho cov kav ntev thiab kev ua haujlwm ntev ntawm cov xim pleev xim, txawm tias nyob rau hauv ib puag ncig hnyav.

Hauv kev xaus, cellulose ethers muab cov kev ua tau zoo tseem ceeb rau ob qho tib si drymix mortars thiab xim los ntawm kev txhim kho dej tuav, thickening, rheology tswj, adhesion, cohesion, crack resistance, thiab durability. Lawv versatility thiab kev ua tau zoo ua rau lawv indispensable additives nyob rau hauv kev tsim kho thiab txheej daim ntaub ntawv, pab rau zus tau tej cov high-zoo, ruaj, thiab zoo nkauj cov ntaub ntawv.