Yintoni umahluko phakathi kwe-Hydroxyethyl cellulose (HEC) kunye ne-Hydroxypropyl cellulose (HPC)?

I-Hydroxyethyl cellulose (HEC) kunye ne-hydroxypropyl cellulose (HPC) zizinto ezimbini eziqhelekileyo ze-cellulose derivatives ezisetyenziswa ngokubanzi kwiinkalo ezininzi zoshishino, ezifana namayeza, izithambiso, ukutya kunye nezixhobo zokwakha. Nangona izakhiwo zabo zeekhemikhali zifana kwaye zenziwe ngokuzisa izinto ezithatha indawo kwiimolekyuli ze-cellulose, zinolwahluko oluphawulekayo kwiipropati zeekhemikhali, iipropati zomzimba, kunye neendawo zokusebenzisa.

1. Umahluko kwisakhiwo sekhemikhali

I-Hydroxyethyl cellulose (HEC) iveliswa ngokuzisa iqela le-hydroxyethyl (-CH₂CH₂OH) kwindandatho ye-glucose ye-molecule ye-cellulose. Ubume bayo beekhemikhali buqulethe inani elikhulu le-hydroxyethyl substituents, eyenza i-HEC ibe ne-solubility efanelekileyo yamanzi kunye neempawu zokuqina.

I-Hydroxypropyl cellulose (HPC) yazisa iqela le-hydroxypropyl (-CH₂CHOHCH₃) kwi-molecule ye-cellulose. Ngenxa yobukho beli qela le-hydroxypropyl, i-HPC ibonisa ezinye iimpawu ezahlukileyo kwi-HEC. Ngokomzekelo, inomlinganiselo othile we-hydrophobicity, eyenza i-soluble kwi-solvents ethile yezinto eziphilayo, ezifana ne-ethanol, i-alcohol isopropyl, njl.

2. Umahluko wokunyibilika

Enye yezinto eziphambili ze-HEC kukunyibilika kwayo kakuhle kwamanzi, ngakumbi kumanzi abandayo. Ngenxa yokuqaliswa kwamaqela e-hydroxyethyl, i-HEC inokwenza iibhondi ze-hydrogen kunye neemolekyuli zamanzi xa zichithwa, ngaloo ndlela zichithakala ngokukhawuleza kwaye zichithe. Ngoko ke, i-HEC inoluhlu olubanzi lwezicelo kwiinkqubo ezisekelwe emanzini, ezifana neengubo ezisekelwe emanzini, i-adhesives, i-detergents, njl.

Ukunyibilika kwe-HPC kunzima. Ukunyibilika kwe-HPC emanzini kuchaphazeleka kakhulu bubushushu. Inonyibiliko oluhle kumaqondo obushushu aphantsi, kodwa i-gelation okanye imvula ingenzeka kumaqondo obushushu aphezulu. Kwangaxeshanye, i-HPC ikwanazo ne-solubility kwii-solvents eziphilayo (ezifana ne-ethanol, i-isopropyl alcohol, njl.), ebonelela ngeenzuzo kwezinye izicelo ezikhethekileyo, ezifana ne-organic solvent-based formulations kunye namalungiselelo athile amayeza.

3. Umahluko kwisiphumo sokuqina kunye ne-rheology

I-HEC inekhono elihle lokuqina kwaye inokunyusa kakhulu i-viscosity yesisombululo kwisisombululo esinamanzi, ngoko ke isetyenziswa rhoqo njenge-thickener, i-stabilizer kunye ne-gelling agent. Isiphumo sokuqina kwe-HEC sichaphazeleka bubunzima bemolekyuli kunye nenqanaba lokutshintsha. Ubukhulu be-molecular weight kunye nenqanaba eliphezulu lokutshintshwa, ubukhulu be-viscosity yesisombululo. Ngelo xesha, ukuziphatha kwe-rheological yezisombululo ze-HEC yi-pseudoplastic, oko kukuthi, njengoko izinga lokucheba linyuka, i-viscosity yesisombululo iyancipha, eluncedo kakhulu kwiifom ezifuna ukuzinza kunye nokuhamba kakuhle.

Isiphumo esityebileyo se-HPC sibuthathaka ngokwentelekiso, kodwa ngenxa yeempawu zesakhiwo semolekyuli, izisombululo zalo zibonisa iimpawu ezahlukeneyo zerheological. Izisombululo ze-HPC zihlala zineempawu ze-Newtonian fluid, oko kukuthi, isisombululo se-viscosity sizimele kwireyithi yokucheba, ebaluleke kakhulu kwezinye izicelo ezifuna i-viscosity efanayo. Ukongeza, i-HPC nayo ineempawu ezilungileyo zokwenza ifilimu, eyenza ukuba isetyenziswe ngokubanzi kwiinkalo ezifana namayeza kunye neengubo.

4. Ukuzinza kunye nokuchasana kweekhemikhali

I-HEC ibonisa ukuzinza kweekhemikhali eziphezulu kwiindidi zexabiso le-pH kwaye ngokuqhelekileyo iyakwazi ukusebenza ngokuzinzile kwi-pH ye-2 ukuya kwe-12. Ngoko ke, i-HEC ifanelekile ukusetyenziswa phantsi kweemeko ze-acidic kunye ne-alkaline kwaye isetyenziswe ngokubanzi kwi-detergents, izimonyo kunye nezinye iinkalo.

Nangona i-HPC inozinzo olululo lweekhemikhali, ukuguquguquka kwayo kwixabiso le-pH incinci kancinci, kwaye ifanelekile ngokubanzi kwiindawo ezingathathi hlangothi okanye ezibuthathaka. Kwezinye iimeko apho ukubunjwa kwefilimu okanye i-hydrophobicity iyadingeka, i-HPC inokubonelela ngokusebenza okugqwesileyo ngenxa yesakhiwo sayo esikhethekileyo, njengento yokukhutshwa okuzinzileyo okanye icandelo lokugubungela amachiza.

5. Umahluko kwiinkalo zesicelo

Imiba yesicelo se-HEC ikakhulu ibandakanya:

Izinto zokwakha: Njenge-thickener kunye ne-gelling agent, i-HEC isetyenziswa ngokubanzi kwizinto ezisekelwe kwi-samente, iingubo kunye nodaka lokwakha ukunceda ukuphucula ukusebenza kokwakhiwa kunye nokuchasana kwamanzi.

Iingubo kunye neepeyinti: I-HEC isetyenziselwa ukugquma okusekelwe emanzini ukuze kuqiniswe, kumiswe, ukusabalalisa kunye nokuzinzisa, ngaloo ndlela kuphuculwe ukusetyenziswa kwengubo kunye nokubonakala.

Iimveliso zemichiza yemihla ngemihla: Kwiimveliso zemichiza zemihla ngemihla ezifana ne-detergents kunye ne-shampoos, i-HEC isebenza njenge-thickener kunye ne-stabilizer, enokuphucula ukuthungwa kunye namava okusetyenziswa kwemveliso.

Ezona ndawo zisetyenziswayo zeHPC ziquka:

Intsimi yoShishino: I-HPC isoloko isetyenziswa njengezinto zokugquma kunye namalungiselelo okukhululwa okuzinzileyo kumachiza ngenxa yendlela egqwesileyo yokwenza ifilimu kunye neempawu ezikhutshwayo. Ukongeza, ikwanezicelo ezibalulekileyo kwizibophelelo zethebhulethi.

Ukutya kunye nezithambiso: I-HPC isetyenziswa njenge-thickener kunye ne-emulsifier kwishishini lokutya, kwaye njenge-agent eyenza ifilimu kwi-cosmetics ukunceda ukuphucula ukuthungwa kunye ne-ductility yeemveliso.

Ii-Coatings kunye nee-Inks: Ngenxa yokunyibilika kwayo kunye neempawu zokwenza ifilimu, i-HPC isoloko isetyenziselwa ukugquma kunye nokwakheka kweenki ezifuna i-solvents ye-organic, ukubonelela ngeengqimba zefilimu ezigudileyo kunye nokuhamba kakuhle.

6. Ukhuseleko lokusingqongileyo kunye nokhuseleko

Zombini i-HEC kunye ne-HPC zibhekwa njengezinto ezikhuselekileyo kumzimba womntu kunye nokusingqongileyo kwaye zisetyenziswa ngokubanzi kwiimveliso ezifuna ukudibanisa nomzimba womntu, njengezithambiso kunye namayeza. Nangona kunjalo, i-HPC i-soluble kwi-solvents ethile ye-organic, enokuthi ibangele imingeni ethile kwizicelo ezineemfuno eziphezulu zokusingqongileyo, ngelixa i-HEC isetyenziswa kakhulu ekuqulunqweni kwe-soluble yamanzi, ngoko kulula ukuhlangabezana neemfuno eziluhlaza zokusingqongileyo.

I-Hydroxyethyl cellulose (HEC) kunye ne-hydroxypropyl cellulose (i-HPC), njenge-cellulose derivatives, inezinto ezifanayo kwi-chemical structure, i-solubility, i-thickening effect, i-rheological properties, imimandla yesicelo kunye neepropati zokukhusela indalo. Kukho umahluko obonakalayo kwimiba. Ngenxa yokugqwesa kwayo ukunyibilika kwamanzi kunye neempawu ezityebileyo, i-HEC isetyenziswa ngokubanzi kwimiqulu esekwe emanzini, efana neengubo, izinto zokwakha kunye neemveliso zemichiza yemihla ngemihla. I-HPC inezicelo ezizodwa kumayeza, ukutya kunye nezinye iingubo ezikhethekileyo ngenxa yokunyibilika kwayo, ukubunjwa kwefilimu kunye neepropati ezikhutshwayo. Ukukhetha ukuba yeyiphi i-cellulose derivative ekufuneka isetyenziswe ngokuqhelekileyo ixhomekeke kwiimfuno zesicelo kunye neemfuno zokwenziwa.