Yuav Ua Li Cas Ntxiv HEC rau Latex Xim?

Hydroxyethyl cellulose (HEC) yog cov feem ntau siv nonionic thickener thiab rheology hloov kho nyob rau hauv latex xim. Nws ua tau zoo txhim kho cov qauv viscosity, qib qib khoom, kev ruaj ntseg cia, thiab kev ua haujlwm tiv thaiv kev ua haujlwm ntawm lub cev. Kev ntxiv HEC rau cov xim latex tsis tsuas yog cuam tshuam rau cov nqi khoom, tab sis kuj cuam tshuam ncaj qha rau cov xim zaj duab xis zoo thiab daim ntawv thov. Cov hauv qab no muab ib qho kev piav qhia los ntawm plaub yam: xaiv, ntau npaum li cas, ntxiv txoj kev, thiab kev ceev faj.

1. Xaiv qhov tsim nyog viscosity qib raws li Latex xim hom

1.1. Sab Hauv Phab Ntsa Latex Xim (Kev lag luam / hom qauv)

Nws raug pom zoo kom siv qhov nruab nrab-rau-siab viscosity HEC nrog viscosity ntawm 30,000-60,000 mPa·s. Nws cov txiaj ntsig muaj xws li kev ua haujlwm siab thickening, zoo nqi-zoo, thiab muaj peev xwm ua tau raws li qib thiab thixotropic qhov yuav tsum tau ua ntawm cov xim sab hauv phab ntsa.

1.2. High-end Sab Hauv Phab Ntsa Paints (Matte, Satin)

High viscosity khoom nrog viscosity ntawm 60,000-100,000 mPa·s tuaj yeem xaiv, ua rau smoother, thicker tiav thiab zoo dua anti-splatter zog thaum thov.

1.3. Sab nrauv phab ntsa Latex xim

Txhawm rau txhim kho kev tiv thaiv sagging thiab dej tsis kam, nruab nrab viscosity HEC (30,000-60,000 mPa·s) feem ntau yog siv, feem ntau compounded nrog cellulose ethers los yog PU thickeners kom ua tau zoo yield zog thiab cia stability.

1.4. High PVC Systems (Putty-type Latex Paints)

High-thickening efficiency HECs yuav tsum tau ua kom muaj kev ncaj ncees thiab tiv thaiv kev sib cais thiab kev sib cais.

Feem ntau, kev xaiv ntawm qib viscosity yuav tsum sib npaug cov nyhuv thickening, tus nqi, thiab kev ua haujlwm ntawm daim ntawv thov; viscosity siab dua tsis yog ib txwm zoo dua.

2. Tsim nyog tswj HEC Ntxiv

2.1. 0.2%-0.6% (raws li cov khoom tiav)

Cov xim pleev xim sab hauv sab hauv feem ntau siv 0.25%-0.40%, thaum cov txheej txheem high-end lossis high-PVC systems tuaj yeem ncav cuag li 0.5%.

2.2. Tus nqi ntxiv yuav tsum tau hloov me ntsis raws li cov hauv qab no:

Pigment thiab muab tub lim ntau npaum li cas thiab PVC tus nqi: Qhov siab dua PVC, ntau HEC yuav tsum tau.

Hom emulsion: emulsions uas muaj feem ntau ntawm cov yeeb yaj kiab tsim cov tshuaj thiab muaj zog cohesion yuav tsum tau me ntsis thickener.

Lub hom phiaj viscosity: Cov kev thov sib txawv ua rau muaj qhov sib txawv tseem ceeb hauv qhov xav tau viscosity.

Kev sib xyaw nrog lwm cov thickeners: Yog tias ua ke nrog HEUR, ASE, thiab lwm yam, HEC ntau npaum li cas yuav raug txo kom tsim nyog.

RHEC qhov ntau npaum li cas yuav tsum ua tiav: nruab nrab static viscosity, system stability, tsis muaj splattering thaum lub sij hawm thov, thiab ib tug zoo txhuam.

3. Kho cov txheej txheem ntxiv thiab tshem tawm

3.1. Pre-npaj Tshuag Solution Method (pom zoo)

Npaj pob tshab, kua nplaum ntawm HEC ntawm qhov sib piv ntawm 1:20-1:40 ua ntej muab tso rau hauv cov xim latex. Qhov zoo:

Kev sib cais tag nrho, tsis muaj ntses-qhov muag hais

Yooj yim viscosity fine-tuning

Tsis txhob cuam tshuam cov thickening hauv zos ntawm emulsion

Cov khoom lag luam yuav tsum tau yaj 1-2 teev ua ntej.

3.2. Direct Dry Powder Addition Method (Yuav tsum tau tswj nruj)

Yog tias tsim nyog ntxiv hmoov qhuav, ua raws li cov lus qhia no:

Maj mam sieve nyob rau hauv thaum dispersing ntawm kev kub ceev kom tsis txhob clumping

Ntxiv thaum lub sij hawm aqueous, dissolving tag ua ntej ntxiv rau lub emulsion

Lub sijhawm dispersion yuav tsum tsis pub tsawg tshaj 20-30 feeb

Ntxiv tus neeg sawv cev ua ntej ntub dej los yog siv HEC sai sai yog tias tsim nyog los txo cov clumping.

4. Cov txheej txheem rau Optimizing System Rheological teebmeem

4.1. Siv nrog HEUR/ASE

Cov txheej txheem sib xyaw ua ke txhim kho thixotropy, txhim kho kev tiv thaiv splatter thiab qib qib, thiab ua rau daim ntawv thov smoother.

4.2. pH Control thiab Preservative System

HEC ua tau zoo tshaj plaws hauv pH ntau ntawm 7-11; acidity ntau dhau tuaj yeem txo viscosity yooj yim. Qee cov tshuaj tua kab mob tuaj yeem cuam tshuam qhov kev sib cais ntawm HEC.

4.3. Kev tswj kev ruaj ntseg cia

Thaum lub sij hawm ntev cia ntawm qhov kub thiab txias, high-viscosity HEC tej zaum yuav muaj kev txo qis hauv viscosity. Yog li ntawd, cov khoom siv kho qhov chaw tuaj yeem xaiv tau.

4.4. Tiv thaiv False Thickening thiab Sagging

Tom qab ua tiav lub hom phiaj viscosity nyob rau hauv lub formulation, txhuam, dov, thiab sagging xeem yuav tsum tau ua. HEC piv yuav tsum tau kho kom zoo kom ntseeg tau tias daim ntawv thov zoo ib yam.

Qhov tsim nyog ntxiv ntawmHEC rau cov xim latex yuav tsum muaj kev xav txog kev xaiv qib viscosity, kev tswj ntau npaum li cas, txoj kev sib cais, thiab kev txhim kho rheological qauv. Xaiv txoj cai HEC thiab siv nws kom raug tsis yog tsuas yog txhim kho kev ua haujlwm thiab kev pom zoo ntawm cov xim, tab sis kuj txhim kho kev ruaj khov thiab qib khoom, ua rau nws yog ib qho tseem ceeb ntawm kev txhim kho cov xim pleev xim zoo.