HEC yunvikana kuri pH?

Hydroxyethylcellulose (HEC) ni polimeri ikabura amazi ikunze gukoreshwa mu nganda n'ubushakashatsi bwa siyansi. Ikoreshwa cyane cyane mubyimbye, ikora firime, ifata, emulifier na stabilisateur.

Ibintu shingiro bya HEC
HEC ni polymer idafite amazi-elegitoronike, hydroxyethylated deriviv ikomoka muri selile ikoresheje reaction ya Ethylation. Bitewe nuburyo butari ionic, imyitwarire ya HEC mugisubizo ntabwo ihindurwa cyane na pH yumuti. Ibinyuranye, polymers nyinshi ionic (nka sodium polyacrylate cyangwa carbomers) zumva cyane pH kubera ko leta yishyuza ihinduka hamwe nimpinduka za pH, bikagira ingaruka kumyuka no kubyimba. imikorere nibindi bintu.

Imikorere ya HEC ku ndangagaciro zitandukanye za pH
HEC muri rusange ifite ituze ryiza mubihe bya acide na alkaline. By'umwihariko, HEC irashobora kugumana ubwiza bwayo hamwe no kubyimba hejuru yurwego runini rwa pH ibidukikije. Ubushakashatsi bwerekana ko ubushobozi bwa HEC n'ubukonje bwa HEC butajegajega muburyo bwa pH buri hagati ya 3 na 12. Ibi bituma HEC ihinduka cyane kandi ikabyara ibintu byinshi mubikorwa byinganda kandi birashobora gukoreshwa mubihe bitandukanye bya pH.

Nyamara, ituze rya HEC rishobora kugira ingaruka ku gaciro gakabije ka pH (nka pH munsi ya 2 cyangwa hejuru ya 13). Muri ibi bihe, iminyururu ya HEC irashobora guhura na hydrolysis cyangwa iyangirika, bigatuma igabanuka ryayo cyangwa ihinduka ryimiterere. Kubwibyo, gukoresha HEC muri ibi bihe bikabije bisaba kwitondera byumwihariko ituze.

Ibitekerezo byo gusaba
Mubikorwa bifatika, pH sensitivite ya HEC nayo ifitanye isano nibindi bintu, nkubushyuhe, imbaraga za ionic, hamwe na polarite yumuti. Mubisabwa bimwe, nubwo pH ihinduka igira ingaruka nto kuri HEC, ibindi bidukikije bishobora kongera iyi ngaruka. Kurugero, mubihe byubushyuhe bwo hejuru, iminyururu ya molekile ya HEC irashobora hydrolyze byihuse, bityo bikagira ingaruka zikomeye kumikorere.

Mubyongeyeho, mubisobanuro bimwe na bimwe, nka emulisiyo, geles hamwe na coatings, HEC ikoreshwa kenshi hamwe nibindi bikoresho (nka surfactants, umunyu cyangwa aside-fatizo). Kuri iyi ngingo, nubwo HEC itumva pH ubwayo, ibyo bindi bice bishobora kugira ingaruka zitaziguye imikorere ya HEC muguhindura pH. Kurugero, kwishyuza imiterere ya surfactants zimwe zihinduka kubiciro bitandukanye bya pH, bishobora kugira ingaruka kumikoranire hagati ya HEC na surfactants, bityo bigahindura imiterere ya rheologiya yibisubizo.

HEC ni polymer itari ionic isa naho itumva pH kandi ifite imikorere myiza kandi ihamye kurwego rwagutse rwa pH. Ibi bituma ikoreshwa cyane mubikorwa byinshi, cyane cyane aho bikenewe imikorere ihamye yibyimbye hamwe nabashinzwe gukora firime. Nubwo bimeze bityo ariko, biracyakenewe gusuzuma uburyo ituze nimikorere ya HEC bishobora kugira ingaruka mubihe bikabije bya pH cyangwa mugihe bikoreshejwe nibindi bikoresho bya pH. Kubibazo bya pH byunvikana mubisabwa byihariye, birasabwa gukora ibizamini no kugenzura mbere yo gukoreshwa kugirango harebwe niba HEC ishobora gukora neza mubihe byateganijwe.