Hydroxyethylcellulose (HEC) i polymer inonyungudika nemvura inowanzoshandiswa muindasitiri nekutsvaga kwesainzi. Inonyanya kushandiswa seyakakora, firimu-inogadzira agent, inonamira, emulsifier uye stabilizer.
Basic zvimiro zveHEC
HEC isiri-ionic mvura-soluble polymer, hydroxyethylated derivative inowanikwa kubva ku cellulose kuburikidza ne ethylation reaction. Nekuda kweiyo isiri-ionic hunhu, maitiro eHEC mumhinduro kazhinji haana kunyanya kuchinjwa nepH yemhinduro. Kusiyana neizvi, ma ionic polymers akawanda (akadai sesodium polyacrylate kana carbomers) anonyanya kuona pH nekuti mamiriro echaji anoshanduka nekuchinja kwepH, zvichikanganisa kunyungudika nekukora kwawo. performance nezvimwe zvinhu.
Kuita kweHEC kune akasiyana pH maitiro
HEC kazhinji ine kugadzikana kwakanaka pasi pe acidic uye alkaline mamiriro. Kunyanya, HEC inogona kuchengetedza viscosity yayo uye kukora zvivakwa pamusoro peyakasiyana siyana pH nharaunda. Kutsvakurudza kunoratidza kuti viscosity uye thickening kukwanisa kweHEC inenge yakagadzikana mukati me pH ye 3 kusvika ku 12. Izvi zvinoita kuti HEC ive yakanyanyisa kushanduka thickener uye stabilizer mumashandisirwo akawanda emabhizimisi uye inogona kushandiswa pasi pemamiriro akasiyana epH.
Nekudaro, kugadzikana kweHEC kunogona kukanganiswa pane yakanyanyisa pH kukosha (senge pH pazasi 2 kana pamusoro pe13). Pasi pemamiriro ezvinhu aya, HEC's molecular cheni inogona kupinda hydrolysis kana kuora, zvichiita kuti kuderedza viscosity yayo kana kuchinja kwezvinhu zvayo. Nokudaro, kushandiswa kweHEC pasi pemamiriro ezvinhu aya akanyanyisa kunoda kunyatsotarisirwa kugadzikana kwayo.
Mafungiro ekushandisa
Mumashandisirwo anoshanda, iyo pH senitivity yeHEC inobatanawo nezvimwe zvinhu, senge tembiricha, ionic simba, uye polarity yezvinonyungudutsa. Mune mamwe maapplication, kunyangwe pH shanduko ine diki mhedzisiro paHEC, zvimwe zvakatipoteredza zvinogona kuwedzera izvi. Semuenzaniso, pasi pemamiriro ekupisa kwepamusoro, HEC's molecular cheni inogona hydrolyze nekukurumidza, nekudaro ichive nemhedzisiro yakakura pakuita kwayo.
Mukuwedzera, mune mamwe magadzirirwo, akadai se emulsions, gels uye majasi, HEC inowanzoshandiswa pamwe chete nezvimwe zvinoshandiswa (zvakadai se surfactants, munyu kana acid-base regulators). Panguva ino, kunyange HEC isinganzwisisi pH pachayo, izvi zvimwe zvikamu zvinogona kukanganisa zvisina kunanga kushanda kweHEC nekushandura pH. Semuenzaniso, iyo yekuchaja mamiriro evamwe ma surfactants anochinja pane akasiyana pH kukosha, izvo zvinogona kukanganisa kudyidzana pakati peHEC nevano surfactants, nekudaro vachishandura rheological properties yemhinduro.
HEC isiri-ionic polymer iyo isingaderere kune pH uye ine kuita kwakanaka uye kugadzikana pamusoro pehupamhi pH renji. Izvi zvinoita kuti zvishandiswe zvakanyanya mumashandisirwo mazhinji, kunyanya panodiwa kugadzikana kuita kweakobvu nemafirimu ekare. Zvisinei, zvichiri kukosha kufunga kuti kugadzikana uye kushanda kweHEC kunogona kuchinjwa sei pasi pemamiriro ezvinhu epH yakanyanyisa kana kushandiswa nemamwe pH-sensitive ingredients. Nezve pH senitivity nyaya mumashandisirwo chaiwo, zvinokurudzirwa kuita zvinoenderana nekuyedzwa uye ongororo isati yashandiswa chaiyo kuona kuti HEC inogona kuita zvakanaka pasi pemamiriro anotarisirwa.
Nguva yekutumira: Aug-19-2024