I-Hydroxyethyl cellulose (HEC) yi-polymer engeyiyo ionic, enyibilikayo emanzini ephuma kwi-cellulose ngokuguqulwa kweekhemikhali. Isetyenziswa kakhulu kumashishini ahlukeneyo ngenxa yeempawu zayo ezikhethekileyo, ezinje ngokutyeba, ukuzinza, kunye nobuchule bokwenza ifilimu. Kwizicelo apho ukuzinza kwe-pH kubalulekile, ukuqonda indlela i-HEC eziphatha ngayo phantsi kweemeko ezahlukeneyo ze-pH kubalulekile.
Uzinzo lwe-pH lwe-HEC lubhekisa kubuchule bayo bokugcina ubume bayo, iipropati ze-rheological, kunye nokusebenza kwiindawo ezahlukeneyo ze-pH. Olu zinzo lubaluleke kakhulu kwizicelo ezifana neemveliso zokhathalelo lomntu, amayeza, iingubo, kunye nezixhobo zokwakha, apho i-pH yendawo engqongileyo inokwahluka kakhulu.
Ulwakhiwo:
I-HEC idla ngokwenziwa ngokudibanisa i-cellulose ne-ethylene oxide phantsi kweemeko ze-alkaline. Le nkqubo iphumela ekutshintshweni kwamaqela e-hydroxyl e-cellulose backbone ngamaqela e-hydroxyethyl (-OCH2CH2OH). Iqondo lokutshintshwa (DS) libonisa inani eliqhelekileyo lamaqela e-hydroxyethyl ngeyunithi nganye ye-anhydroglucose kwikhonkco le-cellulose.
Iipropati:
Ukunyibilika: I-HEC iyanyibilika emanzini kwaye yenza izisombululo ezicacileyo neziqinileyo.
Ukuqina: Ibonakalisa ukuziphatha kwe-pseudoplastic okanye ukucheba, oko kuthetha ukuba ukuqina kwayo kuncipha xa isheyiwe. Le mpawu iyenza ibe luncedo kwiindawo apho ukuhamba kwamanzi kubalulekile, njengepeyinti kunye neengubo.
Ukuqina: I-HEC inika i-viscosity kwizisombululo, nto leyo eyenza ukuba ibe luncedo njenge-arhente yokuqina kwiifomyula ezahlukeneyo.
Ukwenziwa kwefilimu: Ingenza iifilimu eziguquguqukayo nezibonakalayo xa zomisiwe, nto leyo eluncedo kwiindlela ezifana nezincamathelisi kunye neengubo.
Uzinzo lwe-pH ye-HEC
Uzinzo lwe-pH lwe-HEC luphenjelelwa zizinto ezahlukeneyo, kuquka ulwakhiwo lweekhemikhali ze-polymer, ukusebenzisana nendawo engqongileyo, kunye nazo naziphi na izongezo ezikhoyo kwifomyula.
Uzinzo lwe-pH ye-HEC kwiindidi ezahlukeneyo ze-pH:
1. I-pH ene-asidi:
Kwi-acidic pH, i-HEC iqhele ukuba izinzile kodwa isenokungena kwi-hydrolysis ixesha elide phantsi kweemeko ezinzima ze-acidic. Nangona kunjalo, kwiindawo ezininzi ezisebenzayo, ezifana neemveliso zokhathalelo lomntu kunye neengubo, apho i-acidic pH ifunyanwa khona, i-HEC ihlala izinzile ngaphakathi koluhlu lwe-pH oluqhelekileyo (i-pH 3 ukuya kwi-6). Ngaphaya kwe-pH 3, umngcipheko we-hydrolysis uyanda, okukhokelela ekunciphiseni kancinci kwe-viscosity kunye nokusebenza. Kubalulekile ukujonga i-pH yeefomyula ezine-HEC kwaye uzilungise njengoko kuyimfuneko ukugcina uzinzo.
2. I-pH engathathi cala:
I-HEC ibonisa uzinzo olugqwesileyo phantsi kweemeko ze-pH ezingathathi hlangothi (i-pH 6 ukuya kwi-8). Olu luhlu lwe-pH luqhelekile kwiindawo ezininzi zokusebenza, kubandakanya izinto zokuthambisa, amayeza, kunye neemveliso zasekhaya. Iifomyula ezine-HEC zigcina i-viscosity yazo, iipropati zokutyeba, kunye nokusebenza ngokubanzi ngaphakathi kolu luhlu lwe-pH. Nangona kunjalo, izinto ezifana nobushushu kunye namandla e-ionic zinokuchaphazela uzinzo kwaye kufuneka ziqwalaselwe ngexesha lophuhliso lwefomyula.
3. I-pH ye-alkaline:
I-HEC ayizinzanga kangako phantsi kweemeko ze-alkaline xa ithelekiswa ne-acidic okanye i-neutral pH. Kwizinga eliphezulu le-pH (ngaphezulu kwe-pH 8), i-HEC inokuwohloka, nto leyo ebangela ukwehla kwe-viscosity kunye nokulahleka kokusebenza. I-alkaline hydrolysis ye-ether linkages phakathi kwe-cellulose backbone kunye namaqela e-hydroxyethyl inokwenzeka, nto leyo ekhokelela ekuqhekekeni kwe-chain kunye nokuncipha kobunzima be-molecular. Ke ngoko, kwi-alkaline formulations ezifana neesepha okanye izinto zokwakha, ii-polymers okanye izibambisi-ndlela zinokukhethwa kune-HEC.
Izinto Ezichaphazela Uzinzo lwe-pH
Zininzi izinto ezinokuchaphazela uzinzo lwe-pH ye-HEC:
Inqanaba lokuTshintsha (DS): I-HEC enexabiso eliphezulu le-DS idla ngokuzinza ngakumbi kuluhlu olubanzi lwe-pH ngenxa yokutshintshwa okwandisiweyo kwamaqela e-hydroxyethyl ngamaqela e-hydroxyethyl, nto leyo ephucula ukunyibilika kwamanzi kunye nokumelana ne-hydrolysis.
Ubushushu: Ubushushu obuphezulu bunokukhawulezisa ukusabela kweekhemikhali, kuquka i-hydrolysis. Ke ngoko, ukugcina ubushushu obufanelekileyo bokugcina nokucubungula kubalulekile ekugcineni uzinzo lwe-pH lweefomyula ezine-HEC.
Amandla e-Ionic: Ubuninzi beetyuwa okanye ezinye ii-ion kwifomyula bunokuchaphazela ukuzinza kwe-HEC ngokuchaphazela ukunyibilika kwayo kunye nokusebenzisana kwayo neemolekyuli zamanzi. Amandla e-Ionic kufuneka aphuculwe ukuze kuncitshiswe iziphumo zokungazinzi.
Izinto ezongeziweyo: Ukufakwa kwezinto ezongeziweyo ezifana nezinto ezisetyenziswa xa kusenziwa izinto ...yo, okanye ezisetyenziswa xa kusenziwa izinto ezisetyenziswa xa kusenziwa izinto ezisetyenziswa xa kusenziwa izinto ezisetyenziswayo, okanye ezisetyenziswa xa kusenziwa izinto ezisetyenziswa xa kusenziwa izinto ezisetyenziswayo, kunokuchaphazela uzinzo
Izicelo kunye nokuqwalaselwa kokuQulunqwa
Ukuqonda uzinzo lwe-pH ye-HEC kubalulekile kubaqulunqi beekhemikhali kwimizi-mveliso eyahlukeneyo.
Nazi ezinye izinto ekufuneka ziqwalaselwe ngokwesicelo:
Iimveliso Zokunyamekela Umzimba: Kwiishampu, kwii-conditioner, nakwii-lotions, ukugcina i-pH ngaphakathi koluhlu olufunekayo (ngesiqhelo malunga ne-neutral) kuqinisekisa uzinzo kunye nokusebenza kwe-HEC njenge-arhente yokuqina kunye nokuxhoma.
Amayeza: I-HEC isetyenziswa kwi-suspensions yomlomo, kwizisombululo zamehlo, nakwi-compositions zangaphandle. Ii-compositions kufuneka zenziwe kwaye zigcinwe phantsi kweemeko ezigcina uzinzo lwe-HEC ukuqinisekisa ukusebenza kakuhle kwemveliso kunye nexesha layo lokuphelelwa.
Iingubo kunye neepeyinti: I-HEC isetyenziswa njengesilungisi se-rheology kunye nesiqinisi kwiipeyinti kunye neengubo ezisekelwe emanzini. Iifomyula kufuneka zilinganise iimfuno ze-pH kunye nezinye iikhrayitheriya zokusebenza ezifana ne-viscosity, i-leveling, kunye nokwakheka kwefilimu.
Izixhobo zokwakha: Kwiifomyula ezisebenzisa isamente, i-HEC isebenza njengearhente yokugcina amanzi kwaye iphucula ukusebenza kakuhle. Nangona kunjalo, iimeko ze-alkaline kwisamente zinokubeka umngeni kuzinzo lwe-HEC, nto leyo ebangela ukuba kukhethwe ngononophelo kwaye kulungiswe iifomyula.
I-Hydroxyethyl cellulose (HEC) inika iipropati ezixabisekileyo ze-rheological kunye nokusebenza kwizicelo ezahlukeneyo. Ukuqonda ukuzinza kwayo kwe-pH kubalulekile kubaqulunqi be-formula ukuze baphuhlise iifomyula ezizinzileyo nezisebenzayo. Ngelixa i-HEC ibonisa ukuzinza okuhle phantsi kweemeko ze-pH ezingathathi cala, kufuneka kuqwalaselwe iimeko ze-acidic kunye ne-alkaline ukuthintela ukuwohloka nokuqinisekisa ukusebenza kakuhle. Ngokukhetha inqanaba elifanelekileyo le-HEC, ukwenza ngcono iiparameters zefomyula, kunye nokusebenzisa iimeko ezifanelekileyo zokugcina, abaqulunqi be-formula banokusebenzisa iingenelo ze-HEC kwiindawo ezahlukeneyo ze-pH.
Ixesha leposi: Matshi-29-2024