Thickeners tau siv dav hauv kev lag luam, suav nrog cov txheej txheej, cov ntaub ntawv hauv tsev, tshuaj pleev ib ce, khoom noj khoom haus thiab tshuaj. Hydroxyethyl cellulose (HEC) yog qhov tseem ceeb tshaj uas tau nyiam mloog rau nws cov peev txheej thiab cov ntawv thov thoob plaws.
1. Muaj pes tsawg leeg thiab qhov chaw
HEC yog lub cellulose ither ua los ntawm kev rov ua lub cellulose ntuj nrog ethylene oxide. Nws yog cov dej tsis-ionic-soluble polymer nrog tshuaj lom neeg ruaj khov. Hauv kev sib piv, lwm cov tuab muaj ntau cov chaw, suav nrog cov hauv qab no:
Ntuj polysacinters thickeners: xws li xanthan ntawm cov pos hniav thiab cov gaseners yog muab tau los ntawm cov nroj tsuag ntuj lossis muaj kev tiv thaiv microbial thiab muaj cov kev tiv thaiv microbial thiab muaj cov kev tiv thaiv microbial.
Syntheters thickeners: xws li acrylic acid polymers (carbomer), uas yog synthesized raws li petrochemicals, muaj kev ua tau ruaj khov, tab sis txom nyem biodegradability.
Protein thickeners: xws li gelatin, feem ntau yog muab tau los ntawm cov nqaij tsiaj thiab yog qhov tsim nyog rau cov khoom noj thiab tshuaj.
HEC muaj ob qho kev tiv thaiv ib puag ncig ntawm cov xov xwm ntuj thiab kev ua tau zoo ntawm kev hloov kho tshuaj lom neeg hauv kev sib xyaw, nrhiav qhov sib npaug ntawm kev ua phooj ywg thiab versatility.
2. Thickening kev ua tau zoo
HEC muaj cov yam ntxwv hauv qab no hauv kev ua haujlwm thickening:
Solubility: HEC tuaj yeem yaj nyob rau hauv dej txias thiab dej kub kom tsim lub pob tshab viscous daws nrog kev sib dhos sai kawg. Xanthan ntawm cov pos hniav feem ntau yuav tsum tau shear zog los pab cov kev txiav txim siab, thiab kev daws teeb meem yuav muaj qee txoj kev daws teeb meem.
Dav Viscososity Hloov Nruag: Los ntawm kev kho cov molecular hnyav thiab qib ntawm cov qib viscos tuaj yeem tau txais kom tau raws li cov kev thov sib txawv. Hauv kev sib piv, lub viscosity kev hloov kho ntau yam ntawm guaar pos hniav yog nqaim. Txawm hais tias acrylic acid polymer muaj cov nyhuv zoo siv, nws yog qhov rhiab heev rau tus nqi PH.
Shear thinning kev ua tau zoo: HEC muaj qhov ua rau muaj kev coj tus cwj pwm thiab yog qhov haum rau qee lub sijhawm uas qee yam viscosity xav tau kev tswj hwm. Xanthan ntawm cov pos hniav muaj tseem ceeb pseudoplastic thiab haum rau daim ntawv thov ntawm cov txheej txheem thiab cov khoom noj emulsions.
3. Tshuaj Muaj Peev Xwm
HEC muaj kev ruaj khov zoo nyob rau hauv ntau qhov ntau ntau (2-12), thiab yog qhov ntsuas kub thiab ntsev, thiab haum rau cov ntawv siv hauv cov tshuab hluav taws xob lossis ib puag ncig kub. Hauv kev sib piv:
Xanthan ntawm cov pos hniav muaj ntsev zoo dua li HEC, tab sis nws yooj yim degraded nyob rau hauv muaj zog acid thiab alkali tej yam kev mob.
Acrylic polymers yog rhiab rau cov kua qaub thiab alkali, thiab muaj feem xyuam tsis ua tiav nyob rau hauv cov ntsev siab.
Tshuaj lom neeg muaj kev ruaj khov ntawm cov polysaccharide tuab tuab hauv qab kub thiab oxidative cov xwm txheej feem ntau tsis zoo li HEC.
4. Qhov sib txawv hauv cov chaw thov
Txheej txheem thiab cov ntaub ntawv hauv tsev: HEC feem ntau siv nyob rau hauv cov dej pleev dej, putty hmoov thiab mortars, muab cov khoom siv ua kom zoo thiab ua kom muaj dej cia kom huv. Xanthan ntawm cov pos hniav muaj ntau siv nyob rau hauv cov khoom siv dej, feem ntau yog vim nws shear thinning cov khoom.
Cov tshuaj pleev ib ce thiab cov khoom siv txhua hnub: HEC tuaj yeem muab cov tawv nqaij du thiab cov nyhuv zoo heev, thiab yog siv dav hauv lub ntsej muag kom huv thiab muaj tshuaj pleev. Acrylic polymers muaj qhov zoo hauv cov khoom gel vim lawv qhov siab dua thiab muaj peev xwm ua kom muaj zog.
Khoom Noj Khoom Haus thiab Tshuaj: Xanthan ntawm cov pos hniav thiab cov pos hniav guar tau ntau dua hauv cov zaub mov thiab cov tshuaj vim lawv lub keeb kwm kev ua haujlwm thiab zoo biocompatibility. Txawm hais tias HEC tuaj yeem siv rau hauv kev npaj siv tshuaj tiv thaiv-tso tawm, nws muaj cov ntawv thov cov khoom noj tsawg dua.
5. Ib puag ncig thiab tus nqi
HEC yog ib puag ncig ua phooj ywg thiab tsis muaj txiaj ntsig vim tias nws yog tsim raws ntawm cov cellulose ntuj. Cov txheej txheem ntau lawm ntawm acrylic polymers muaj qhov cuam tshuam ntau dua rau ib puag ncig thiab yog qhov nyuaj rau kev ua txhaum tom qab muab pov tseg. Txawm hais tias xanthan ntawm cov pos hniav thiab cov pos hniav guar yog ib puag ncig phooj ywg, lawv feem ntau yog siab dua HEC, tshwj xeeb tshaj yog rau kev hloov cov khoom hauv cov ntawv thov tshwj xeeb.
Raws li tuab nrog kev ua tau zoo nrog kev ua tau zoo, HEC muaj qhov tshwj xeeb tshwj xeeb hauv ntau thaj teb. Piv nrog xanthan ntawm cov pos hniav thiab cov guar ntawm cov pos hniav, HEC muaj kev sib tw hauv tshuaj ruaj khov thiab raug nqi zoo; Piv nrog acrylic polymers, HEC yog ib puag ncig ib puag ncig thiab muaj dav dav. Hauv kev xaiv tiag tiag, cov ntsiab lus xws li thickening kev ua tau zoo, tshuaj ruaj khov thiab tus nqi yuav tsum tau ua raws li cov ntaub ntawv tshwj xeeb kom ua tiav thiab muaj txiaj ntsig.
Lub sijhawm Post: Feb-15-2025