Yintoni umahluko phakathi kwe-hydroxyethyl cellulose kunye ne-hydroxypropyl cellulose?

I-Hydroxyethyl Cellulose (HEC) kunye ne-hydroxypropyl cellulose (HPC) zizinto ezimbini ezisetyenziswa ngokuqhelekileyo zeselulosi. Zinokwahlukana okuphawulekayo kwisakhiwo, ukusebenza kunye nokusetyenziswa.

1. Ubume beMichiza
I-Hydroxyethyl cellulose (HEC): I-Hydroxyethyl cellulose yenziwa ngokuzisa iqela le-hydroxyethyl (-CH₂CH₂OH) kwi-molecule ye-cellulose. Iqela le-hydroxyethyl linika i-HEC ukunyibilika okulungileyo kunye nokuzinza.

I-Hydroxypropyl Cellulose (HPC): I-Hydroxypropyl cellulose yenziwe ngokuzisa iqela le-hydroxypropyl (-CH₂CHOHCH₃) kwi-molecule ye-cellulose. Ukuqaliswa kwamaqela e-hydroxypropyl kunika i-HPC eyahlukeneyo yokunyibilika kunye neempawu ze-viscosity.

2. Ukunyibilika
I-HEC: I-Hydroxyethylcellulose ine-solubility efanelekileyo emanzini kwaye inokwenza isisombululo se-colloidal esicacileyo. Ukunyibilika kwayo kuxhomekeke kwiqondo lokutshintshwa kwamaqela e-hydroxyethyl (okt inani lamaqela e-hydroxyethyl ngeyunithi yeglucose).

I-HPC: Iselulosi yeHydroxypropyl ine-solubility ethile kumanzi kunye nezinyibilikisi zendalo, ngakumbi kwizinyibilikisi ze-organic ezifana ne-ethanol. Ukunyibilika kwe-HPC kuchaphazeleka kakhulu bubushushu. Njengoko iqondo lokushisa linyuka, ukunyibilika kwayo emanzini kuya kuncipha.

3. I-Viscosity kunye ne-rheology
I-HEC: I-Hydroxyethyl cellulose ine-viscosity ephezulu emanzini kwaye ibonisa iimpawu ze-pseudoplastic fluid, oko kukuthi i-shear thinning. Xa i-shear isetyenziswe, i-viscosity yayo iyancipha, okwenza kube lula ukuyisebenzisa kunye nokusetyenziswa.

I-HPC: I-Hydroxypropyl cellulose ine-viscosity ephantsi kwaye ibonisa i-pseudoplasticity efanayo kwisisombululo. Izisombululo ze-HPC zinokwenza ii-colloids ezicacileyo, kodwa i-viscosity yazo ihlala iphantsi kune-HEC.

4. Iindawo zokufaka izicelo
I-HEC: I-Hydroxyethyl cellulose isetyenziswa ngokubanzi kwiingubo, izinto zokwakha, izimonyo, i-detergents kunye nezinye iindawo. Njenge-thickener, i-stabilizer kunye ne-agent yokumisa, inokulawula ngokufanelekileyo i-viscosity kunye ne-rheology yenkqubo. Kwiipeyinti kunye neengubo, i-HEC ikhusela ukuhlalisa i-pigment kunye nokuphucula umgangatho wokugquma.

I-HPC: Iselulosi yeHydroxypropyl isetyenziswa ikakhulu kumayeza, ekutyeni, kwizinto zokuthambisa nakweminye imimandla. Kumashishini amayeza, i-HPC isetyenziswa ngokuqhelekileyo njenge-binder kunye ne-arhente yokukhululwa elawulwayo kwiipilisi. Kwishishini lokutya, inokusetyenziswa njenge-thickener kunye ne-emulsifier. Ngenxa yokunyibilika kwayo kwizinyibilikisi eziphilayo, i-HPC ikwasetyenziswa kwizinto ezithile zokwaleka kunye nenwebu.

5. Ukuzinza kunye nokuqina
I-HEC: I-Hydroxyethyl cellulose inozinzo oluhle lweekhemikhali kunye nokuqina, ayinakuchaphazeleka kwiinguqu ze-pH, kwaye ihlala izinzile ngexesha lokugcinwa. I-HEC ihlala izinzile phantsi kweemeko zombini eziphezulu kunye nezantsi ze-pH.

I-HPC: I-Hydroxypropyl cellulose inovelwano kutshintsho kwiqondo lobushushu kunye ne-pH, kwaye ithanda ukukhukuliseka ngakumbi kumaqondo obushushu aphezulu. Ukuzinza kwayo kungcono phantsi kweemeko ze-acidic, kodwa ukuzinza kwayo kuya kuncitshiswa phantsi kweemeko ze-alkaline.

6. Okusingqongileyo kunye nokonakaliswa kwezinto eziphilayo
I-HEC: I-Hydroxyethyl cellulose iphuma kwi-cellulose yendalo, inokonakala okuhle kwe-biodegradability kwaye ihambelana nokusingqongileyo.

I-HPC: I-Hydroxypropyl cellulose ikwayinto enokubola, kodwa indlela yokuziphatha kwayo yokonakala inokwahluka ngenxa yokunyibilika kwayo kunye nokwahluka kwezicelo.

I-Hydroxyethyl cellulose kunye ne-hydroxypropyl cellulose zizinto ezimbini ezibalulekileyo ezivela kwi-cellulose. Nangona bobabini banakho ukutyeba, ukuzinzisa kunye nokwenza i-colloids, ngenxa yokwahlukana kwesakhiwo, banomahluko kwi-solubility, viscosity, kunye neendawo zokusebenzisa. Kukho umahluko omkhulu kuzinzo. Ukukhetha ukuba yeyiphi i-cellulose derivative enokusetyenziswa kuxhomekeke kwiimfuno ezithile zokusetyenziswa kunye neemfuno zokusebenza.