Kev tawg ntawm hydroxyethyl cellulose (HEC) yog ib qho txheej txheem tseem ceeb hauv ntau yam lag luam, suav nrog tshuaj, tshuaj pleev ib ce, khoom noj, thiab kev tsim kho. HEC yog cov polymer uas tsis yog ionic, yaj hauv dej los ntawm cellulose, siv dav ua tus neeg sawv cev ua kom tuab, ruaj khov, thiab ua zaj duab xis. Kev tawg ntawm HEC kom zoo yog qhov tseem ceeb kom ntseeg tau tias nws ua haujlwm tau zoo hauv cov khoom kawg.
Kev Taw Qhia Txog Hydroxyethyl Cellulose (HEC)
Hydroxyethyl cellulose (HEC) yog ib qho polymer uas muaj ntau yam khoom siv tau los ntawm cellulose los ntawm kev hloov kho tshuaj lom neeg. Nws feem ntau siv rau hauv kev lag luam xws li:
Cov Tshuaj: HEC yog siv los ua tus hloov pauv viscosity thiab stabilizer hauv ntau yam formulations, suav nrog cov tshuaj noj thiab tshuaj pleev.
Tshuaj pleev ib ce: HEC siv rau hauv cov tshuaj pleev, tshuaj pleev, tshuaj zawv plaub hau, thiab lwm yam khoom siv tu tus kheej ua tus neeg sawv cev thiab emulsifier.
Khoom noj: Nws yog siv rau hauv cov khoom noj ua cov khoom ua kom tuab, stabilizer, thiab gelling agent.
Kev Tsim Kho: HEC siv rau hauv cov ntaub ntawv tsim kho xws li xim pleev xim, nplaum, thiab cov khoom siv cement los txhim kho lawv cov khoom rheological.
Qhov tseem ceeb ntawm kev faib tawm HEC
Kev sib kis zoo ntawm HEC yog qhov tseem ceeb heev kom ua tiav cov khoom xav tau hauv cov khoom kawg. Kev sib kis zoo ua kom ntseeg tau tias:
Kev Sib Xws: Kev faib tawm ntawm HEC thoob plaws hauv cov tshuaj lossis matrix.
Kev Ua Haujlwm: HEC tuaj yeem ua tiav nws lub luag haujlwm, xws li thickening, stabilizing, lossis forming films.
Kev Ua Tau Zoo: Cov yam ntxwv ua tau zoo dua, suav nrog kev tswj viscosity, kev ruaj khov, thiab kev ntxhib los mos.
Kev Lag Luam: Ua kom muaj txiaj ntsig zoo ntawm kev siv HEC, txo cov khib nyiab, thiab txo cov nqi tsim khoom.
Cov txheej txheem rau kev faib tawm HEC
1. Kev co tshuab:
Kev Sib Tov Los Yog Kev Sib Tov: Siv cov khoom sib tov, cov khoom sib tov, los yog cov khoom sib xyaw ua ke kom maj mam faib HEC mus rau hauv cov kuab tshuaj los yog cov khoom sib xyaw. Kho qhov ceev thiab lub sijhawm sib tov raws li HEC concentration thiab viscosity xav tau.
Kev Sib Tov Ceev Ceev: Siv cov stirrers ceev ceev lossis homogenizers rau kev sib kis sai, tshwj xeeb tshaj yog rau cov HEC concentration siab dua lossis cov kua nplaum.
2. Kev Siv Dej:
Ua Ntej-Hydration: Ua ntej yaj HEC rau hauv ib feem ntawm cov kuab tshuaj ntawm chav tsev kub ua ntej ntxiv rau hauv pawg tseem ceeb. Qhov no ua rau yooj yim dua rau kev sib kis thiab tiv thaiv kev sib sau ua ke.
Maj mam ntxiv: Ntxiv HEC maj mam rau cov kuab tshuaj nrog kev sib xyaw tas li kom ntseeg tau tias muaj dej sib xws thiab kev sib kis.
3. Kev Tswj Kub:
Kub Zoo Tshaj Plaws: Tswj cov txheej txheem dispersion ntawm qhov kub zoo tshaj plaws los txhim kho solubility thiab dispersion kinetics ntawm HEC. Feem ntau, chav tsev kub rau qhov kub siab me ntsis yog qhov tsim nyog rau HEC dispersion.
Da Dej Sov: Siv lub dab dej sov lossis lub thawv uas muaj lub tsho tiv no los tswj qhov kub thaum lub sijhawm tawg, tshwj xeeb tshaj yog rau cov ntawv thov uas xav tau qhov kub siab dua.
4. Kev Kho pH:
pH zoo tshaj plaws: Kho qhov pH ntawm cov kuab tshuaj lossis cov khoom sib xyaw kom haum rau qhov zoo tshaj plaws rau HEC solubility thiab dispersion. Feem ntau, cov xwm txheej pH nruab nrab mus rau me ntsis alkaline yog qhov zoo rau HEC dispersion.
5. Cov Txuj Ci Txiav-Thinning:
Kev Kho Kom Ceev: Siv cov txheej txheem shear-thinning los ntawm kev kho kom ceev thaum lub sijhawm tawg. Kev nrawm siab dua tuaj yeem pab rhuav cov pob zeb HEC thiab txhawb kev tawg.
Kev Siv Cov Khoom Siv Rheological: Siv cov khoom siv rheological los saib xyuas thiab tswj cov nqi shear thaum lub sijhawm dispersion, kom ntseeg tau tias muaj kev dispersion zoo thiab sib xws.
6. Cov tshuaj surfactant pab txhawb kev tawg:
Kev Xaiv Cov Tshuaj Surfactant: Xaiv cov tshuaj surfactants lossis cov neeg sawv cev dispersing uas tsim nyog sib xws nrog HEC thiab cov khoom nruab nrab dispersion. Cov tshuaj surfactants tuaj yeem txo qhov nro ntawm qhov chaw, ua kom cov dej ntub dua, thiab pab txhawb rau HEC dispersion.
Surfactant Concentration: Optimize qhov concentration ntawm surfactants los pab txhawb HEC dispersion yam tsis cuam tshuam nws cov khoom lossis kev ua tau zoo hauv cov khoom kawg.
7. Kev siv tshuab ultrasonic:
Kev Tawm Tsam Ultrasonic: Siv lub zog ultrasonic rau HEC kev tawm tsam siv cov ultrasonic probes lossis baths. Ultrasonication txhawb nqa kev txo qhov loj me ntawm cov khoom me me, deagglomeration, thiab kev sib xyaw ua ke ntawm HEC cov khoom me me hauv cov kuab tshuaj lossis matrix.
8. Cov Txuj Ci Txo Qhov Loj ntawm Cov Khoom Me Me:
Kev Sib Tsoo lossis Kev Sib Tsoo: Siv cov khoom siv sib tsoo lossis kev sib tsoo kom txo qhov loj me ntawm cov khoom sib xyaw HEC, ua kom yooj yim rau kev sib kis thiab txhim kho qhov sib xws ntawm kev sib kis.
Kev Tshuaj Xyuas Qhov Loj ntawm Cov Khoom Me Me: Saib xyuas thiab tswj qhov kev faib tawm ntawm cov khoom me me ntawm HEC uas tau tawg los ntawm kev siv cov txheej txheem xws li laser diffraction lossis dynamic light scattering.
9. Kev Tswj Xyuas Zoo:
Kev Ntsuas Viscosity: Saib xyuas qhov viscosity ntawm HEC dispersions thaum lub sijhawm dispersion kom paub tseeb tias muaj kev sib xws thiab ua tiav cov khoom rheological xav tau.
Kev Tshuaj Xyuas Qhov Loj ntawm Cov Khoom Me Me: Ua qhov kev tshuaj xyuas qhov loj ntawm cov khoom me me los ntsuas qhov ua tau zoo ntawm kev sib kis thiab xyuas kom meej tias cov khoom me me HEC sib npaug.
Kev faib cov hydroxyethyl cellulose (HEC) kom zoo yog qhov tseem ceeb rau kev ua tiav cov khoom thiab kev ua tau zoo hauv ntau yam kev siv hauv kev lag luam. Kev siv cov txheej txheem faib tawm kom zoo, suav nrog kev sib xyaw ua ke, cov txheej txheem hydration, kev tswj kub, kev hloov pH, cov txheej txheem shear-thinning, kev pab surfactant, ultrasonication, thiab kev txo qhov loj me ntawm cov khoom me me, tuaj yeem ua kom muaj kev faib tawm sib xws thiab ua kom HEC ua haujlwm tau zoo tshaj plaws hauv cov khoom kawg. Tsis tas li ntawd, kev siv cov kev ntsuas tswj zoo xws li kev ntsuas viscosity thiab kev tshuaj xyuas qhov loj me ntawm cov khoom me me pab tswj kev sib xws thiab ua kom zoo dua cov txheej txheem faib tawm. Los ntawm kev ua raws li cov lus qhia no, cov chaw tsim khoom tuaj yeem txhim kho kev ua haujlwm zoo thiab zoo ntawm HEC-raws li cov qauv thoob plaws ntau yam kev lag luam.
Lub sijhawm tshaj tawm: Plaub Hlis-09-2024