IHydroxYethyl Cellulose (HEC) iyi-polymer esetshenziswe kabanzi emikhakheni ehlukahlukene ngenxa yezakhiwo zayo ezihlukile ezinjengama-solubity amanzi, amandla okuqina, kanye ne-biocomitity. Ukuqonda ukuqina kwalo ngaphansi kwezimo ezahlukahlukene ze-PH kubalulekile ngohlelo lokusebenza lwayo olusebenzayo.
IHydroxYethyl Cellulose (HEC) iyisisulu se-cellulose, i-polymer eyenzeka ngokwemvelo etholakala kakhulu ezindongeni zeseli zezitshalo. I-HEC ithole ukunakwa okugcwele kwezimboni ezinjengezimboni, izimonyo, ukudla kanye nokwakha ngenxa yezakhiwo zayo eziphawuleka, kufaka phakathi i-solubity yamanzi, amandla okwakha amafilimu, kanye ne-biocomitity. Kodwa-ke, ukuqina kwe-HEC ngaphansi kwezimo ezahlukahlukene ze-Ph kubalulekile ukuze kufakwe ngempumelelo ngohlelo lokusebenza oluhlukahlukene.
Ukuqina kwe-HEC kungathonywa yizici eziningana, nge-PH yokuba ngenye yamapharamitha abucayi kakhulu. I-PH ithinta isimo se-Ionization Stom yamaqembu asebenzayo akhona ku-HEC, ngaleyo ndlela enomthelela esontweni sawo, ukubonakala kwawo nezinye izakhiwo. Ukuqonda indlela yokuziphatha kuka-HEC ezindaweni ezihlukile ze-PH kubalulekile kumakhemikhali ukwenza kahle ukusebenza kwayo kuzicelo ezahlukahlukene.
Isakhiwo se-1.Chical se-Hydroxyethyl celtulose:
I-HEC ihlelwe ngokusabela kwe-cellulose nge-ethylene oxide, okuholela ekwethulweni kwamaqembu we-hydroxyethyl ku-cellulose backbone. Izinga lokufakwa esikhundleni (DS) lamaqembu we-hydroxyethyl linquma izakhiwo ze-HEC, kufaka phakathi i-solubility yayo kanye nekhono lokuqina. Isakhiwo samakhemikhali so-HEC sifaka izici ezihlukile ezenza zilungele izinhlelo ezahlukahlukene zezimboni.
Amaqembu asebenzayo asebenzayo ku-HEC angamaqembu e-hydroxyl (-oh) kanye namaqembu ather (-O-), adlala indima ebalulekile ekuxhumaneni kwawo ngamanzi namanye ama-molecule. Ukuba khona kwama-hydroxyethyl substitunts kwandisa i-hydrophicility ye-cellulose, okuholela ekutheni ithuthukiswe i-solubity yamanzi ethuthukisiwe ngokuqhathaniswa ne-cellulose yendabuko. Ukuxhumana kwe-ether kunikeza ukuqina ku-hec molecule, ukuvimba ukonakala kwawo ngaphansi kwezimo ezijwayelekile.
2.I-2.IRTIORY nge-PH:
Ukuqina kwe-HEC ezindaweni ezahlukahlukene ze-PH kuthonywa i-ionization yamaqembu awo asebenzayo. Ezimweni ze-acid (ph Ngakolunye uhlangothi, ezimeni ze-alkali (PH> 7), ukuncipha kwamaqembu ama-hydroxyl kungenzeka, kuthinta izakhiwo ze-polymer.
E-PH ephansi ph, i-protonwation yamaqembu e-hydroxyl ingaphazamisa ukusebenzisana okubopha ama-hydrogen ngaphakathi kwe-polymer matrix, okuholele ekunciphiseni kwe-soubity kanye nokuqina kokuqina. Le nto ishiwo ngokwengeziwe ngama-degree aphezulu wokufaka esikhundleni sakwaThembisa, lapho inani elikhudlwana lamaqembu e-hydroxyl litholakala ngokuphrolawulo. Ngenxa yalokhu, ukubonwa kwezixazululo ze-HEC kungancipha kakhulu ezindaweni ezine-acidic, kuthinta ukusebenza kwayo njenge-ejenti ekhuthele.
Ngakolunye uhlangothi, ezimeni ze-alkaline, ukuncipha kwamaqembu e-hydroxy kungangezelela i-solubity ye-hec ngenxa yokwakhiwa kwama-alkoxide ion. Kodwa-ke, i-alkalinity eyeqile ingaholela ekunciphiseni kwe-polymer ngokusebenzisa i-hydrolysis eyisisekelo ye-hydrolysis yokuxhumana, okuholela ekunciphiseni ekuboneni kanye nezinye izakhiwo. Ngakho-ke, ukulondolozela i-PH ngaphakathi kohlu olufanele kubalulekile ukuze kuqinisekiswe ukuqina kwe-HEC ekwakhiweni kwe-alkaline.
Imiphumela ye-3.Practical:
Ukuqina kwe-HEC ezindaweni ezahlukahlukene ze-Ph ezivela ezindaweni ezisebenzayo zokusebenzisa kwayo ezimbonini ezahlukene. Embonini yezemithi, i-HEC ivame ukuqashwa njenge-ejenti yokuqina ekwakhekeni komlomo njengokumiswa kweminyakazo, ama-emulsions, nama-gels. I-PH alezi zinto kufanele ilawulwe ngokucophelela ukuze ilondoloze ukubonwa okufiselekayo nokuqina kwe-HEC.
Ngokufanayo, embonini yezimonyo, i-HEC isetshenziswa emikhiqizweni efana nama-shampoos, okhilimu kanye ne-lotions yokuqina nokukhulisa izakhiwo. I-PH alezi zinhlaka ingahluka kakhulu ngokuya ngezidingo zomkhiqizo ezithile kanye nokuhambisana kwe-HEC nezinye izithako. Amakhemikhali kufanele abheke umthelela we-ph ekuzinzeni nasekusebenzeni kwe-HEC ukuqinisekisa ukusebenza kahle komkhiqizo kanye nokwaneliseka kwabathengi.
Embonini yokudla, i-HEC isetshenziswa njenge-ejenti yokuqina nokuzinza emikhiqizweni ehlukahlukene, kufaka phakathi amasoso, ukugqoka kanye nama-dessert. I-PH yokudla kokudla ingasukela ku-acidic kuya ku-alkaline, kuya ngezithako kanye nezimo zokucubungula. Ukuqonda indlela yokuziphatha kuka-HEC ezindaweni ezahlukahlukene ze-PH kubalulekile ekufezekiseni ukuthungwa okudingayo, umlomo, nokuqina emikhiqizweni yokudla.
Embonini yezokwakha, i-HEC isetshenziswa kuzinhlelo zokusebenza ezinjenge-cemential odongeni, ama-grouts, nokunamathela ngokugcinwa kwayo kwamanzi kanye nezakhiwo zokulawula okungokomzimba. I-PH yalezi zinhlaka ingahluka ngokuya ngezinto ezinjengemibandela yokuphulukisa nokuba khona kwezithasiselo. Ukulungiselela ukuqina kwe-PH ye-HEC kubalulekile ekuqinisekiseni ukusebenza nokuqina kwezinto zokwakha.
Ukuqina kwe-Hydroxyyethyl celtulose (HEC) ezindaweni ezahlukahlukene ze-Ph ezivela kulezi zindawo zalo zamakhemikhali, ukusebenzisana nge-PH, kanye nemiphumela esebenzayo emikhakheni ehlukene. Ukuqonda indlela yokuziphatha kuka-HEC ngaphansi kwezimo ezahlukahlukene ze-PH kubalulekile kumakhemikhali ukuze asebenzise kahle ukusebenza kwawo kuzicelo ezahlukahlukene. Kudingeka ucwaningo olwengeziwe ukucacisa izindlela ezingaphansi ezilawula ukuqina kwe-HEC futhi kuthuthukise amasu okuthuthukisa ukusebenza kwawo ngaphansi kwezimo ze-PH eziyinselele.
Isikhathi sePosi: Feb-18-2025