Hydroxyethylcellulose (HEC) yog ntau yam thiab zoo thickener uas yog dav siv nyob rau hauv ntau yam lag luam. Cov tshuaj no yog muab los ntawm cellulose, ib tug natural polymer pom nyob rau hauv loj npaum li cas nyob rau hauv cov nroj tsuag cell phab ntsa. HEC cov khoom tshwj xeeb ua rau nws zoo tagnrho rau thickening ntau yam khoom, los ntawm cov khoom tu tus kheej mus rau cov qauv tsim.
Cellulose Txheej txheem cej luam
Cellulose yog ib qho nyuaj carbohydrate uas tsim los ntawm linear chains ntawm qabzib molecules txuas los ntawm β-1,4-glycosidic bonds. Nws yog cov txheej txheem tseem ceeb ntawm cov phab ntsa ntawm cov nroj tsuag, muab rigidity thiab lub zog rau cov nroj tsuag. Txawm li cas los xij, nws cov ntaub ntawv keeb kwm yog insoluble thiab muaj kev txwv tsis pub siv rau qee yam kev siv.
derivatives ntawm cellulose
Txhawm rau txhim kho kev ua haujlwm ntawm cellulose, ntau yam derivatives tau raug tsim los ntawm kev hloov nws cov qauv. Ib qho piv txwv zoo li no yog hydroxyethyl cellulose (HEC), uas cov pab pawg hydroxyethyl tau nkag mus rau hauv cov pob txha cellulose. Qhov kev hloov kho no muab HEC cov khoom tshwj xeeb, ua rau nws soluble hauv dej thiab ua haujlwm zoo li cov thickener.
Features ntawm HEC
Solubility
Ib qho ntawm cov yam ntxwv tseem ceeb ntawm HEC yog nws cov dej solubility. Tsis zoo li ntuj cellulose, HEC yaj yooj yim hauv dej, tsim cov tshuaj ntshiab. Qhov solubility no ua rau nws yooj yim rau kev koom ua ke rau hauv ntau hom formulations.
Rheological zog
HEC nthuav tawm pseudoplastic lossis shear-thinning tus cwj pwm, txhais tau hais tias nws cov viscosity txo qis hauv kev ntxhov siab thiab nce ntxiv tom qab qhov kev ntxhov siab tau txo qis. Qhov rheology no tseem ceeb heev rau cov ntawv thov uas yuav tsum tau yooj yim ntawm kev sib kis los yog nchuav, xws li kev tsim cov xim, cov nplaum thiab cov khoom tu tus kheej.
pH stability
HEC yog ruaj khov nyob rau hauv ntau pH ntau yam, ua rau nws haum rau siv nyob rau hauv acidic, nruab nrab thiab alkaline formulations. Qhov kev ua tau zoo no tau pab txhawb rau nws txoj kev siv dav hauv ntau yam lag luam xws li tshuaj pleev ib ce, tshuaj thiab zaub mov.
Kev siv ntawm HEC
cov khoom tu tus kheej
Shampoos thiab Conditioners: HEC feem ntau yog siv los ua kom tuab cov khoom tu plaub hau, muab viscosity zoo tagnrho thiab txhim kho kev ntxhib los mos.
Creams thiab Lotions: Hauv cov qauv kev tu tawv nqaij, HEC pab ua tiav qhov xav tau sib xws thiab txhim kho kev sib kis ntawm cov tshuaj pleev thiab tshuaj pleev.
Cov tshuaj txhuam hniav: Nws tus cwj pwm pseudoplastic pab tswj cov tshuaj txhuam hniav uas tso cai rau kom yooj yim faib thiab sib kis thaum txhuam hniav.
Paints thiab Coatings
Latex xim: HEC pab ua kom cov viscosity thiab ruaj khov ntawm cov xim latex, kom ntseeg tau tias txawm tias daim ntawv thov thoob plaws qhov chaw.
Adhesives: Nyob rau hauv daim ntawv nplaum, HEC pab tswj viscosity thiab txhim kho cov khoom sib txuas.
tshuaj
Qhov ncauj Suspensions: HEC yog siv los ua kom tuab qhov ncauj ncua kev kawm los muab ib daim ntawv ruaj khov thiab palatable rau cov kws tshuaj.
Cov tshuaj pleev gels: Lub solubility ntawm HEC hauv dej ua rau nws tsim nyog rau kev tsim cov tshuaj pleev ib ce, ua kom yooj yim ntawm daim ntawv thov thiab nqus.
kev lag luam zaub mov
Sauces thiab hnav khaub ncaws: HEC yog siv los ua kua ntses thiab hnav khaub ncaws, txhim kho lawv cov kev ntxhib los mos thiab qhov ncauj.
Cov Khoom Ci: Hauv qee cov zaub mov ci, HEC pab ua kom cov batters thiab khob noom cookie.
Kev tsim khoom thiab kev tswj xyuas zoo
synthesis
HEC feem ntau yog tsim los ntawm etherification ntawm cellulose nrog ethylene oxide nyob rau hauv kev tswj xyuas. Lub degree ntawm kev hloov pauv (DS) ntawm pawg hydroxyethyl tuaj yeem hloov kho thaum lub sijhawm txheej txheem synthesis, yog li cuam tshuam rau qhov kawg ntawm HEC.
QC
Kev tswj xyuas kev ua tau zoo yog qhov tseem ceeb los xyuas kom meej qhov ua tau zoo ntawm HEC hauv ntau yam kev siv. Cov tsis xws li qhov hnyav molecular, qib ntawm kev hloov pauv thiab purity yog ua tib zoo saib xyuas thaum lub sijhawm tsim khoom.
kev xav txog ib puag ncig
Raws li nrog rau txhua yam tshuaj lom neeg, ib puag ncig yam tseem ceeb. HEC yog muab los ntawm cellulose thiab yog tam sim no ntau biodegradable dua li ib co hluavtaws thickeners. Txawm li cas los xij, nws yog ib qho tseem ceeb uas yuav tsum xav txog tag nrho ib puag ncig ib puag ncig ntawm nws cov khoom tsim thiab siv hauv kev siv sib txawv.
nyob rau hauv xaus
Hauv cov ntsiab lus, hydroxyethylcellulose (HEC) sawv tawm los ua ib qho zoo thiab ntau yam tuab nrog cov ntawv thov thoob plaws ntau qhov kev lag luam. Nws cov khoom tshwj xeeb, suav nrog dej solubility, tus cwj pwm rheological thiab pH stability, ua rau nws muaj txiaj ntsig zoo hauv ntau hom khoom tsim. Raws li kev lag luam txuas ntxiv mus nrhiav lwm txoj hauv kev zoo ib puag ncig, HEC cov khoom siv biodegradable tau los ntawm cov nroj tsuag cellulose ua rau nws muaj kev xaiv ruaj khov rau ntau yam kev siv. Kev tshawb fawb txuas ntxiv thiab kev tsim kho tshiab hauv cellulose derivatives xws li HEC tuaj yeem ua rau muaj kev nce qib ntxiv, muab kev ua tau zoo dua thiab txo qhov cuam tshuam ib puag ncig.
Post lub sij hawm: Dec-02-2023