Hydroxyethyl cellulose (HEC)yog ib qho non-ionic, dej-soluble polymer compound tau los ntawm kev hloov kho tshuaj ntawm cov cellulose ntuj. Vim nws cov thickening zoo heev, emulsifying, suspending, stabilizing, thiab compatibility zog, HEC yog dav siv nyob rau hauv txhua hnub kev lag luam tshuaj, tshwj xeeb tshaj yog nyob rau hauv cov kua ntxuav xws li cov kua ntxuav tais diav, tes xab npum, thiab tshuaj zawv plaub hau.
1. Lub Luag Haujlwm ntawm HEC hauv Cov Kua Ntxuav Phaj
Hauv cov kua ntxuav tais diav, cov haujlwm tseem ceeb ntawm HEC muaj xws li cov hauv qab no:
Kev Ua Kom Thickening thiab Kev Tswj: HEC ua rau kom cov viscosity ntawm cov kua ntxuav tais diav nce ntxiv, muab cov khoom zoo nkauj, flowability, thiab kev paub ntawm tus neeg siv.
Kev Ruaj Ntseg Rau Kev Ncua: Hauv cov kua ntxuav tais diav uas muaj cov khoom siv ntxiv (xws li cov khoom exfoliating thiab hmoov pearl), HEC tuaj yeem tiv thaiv cov khoom me me thiab tswj cov qauv homogeneity.
Kev Ruaj Ntseg Ua Npuas Ncauj: HEC tuaj yeem ua haujlwm nrog surfactants los txhim kho qhov zoo thiab kev ua haujlwm ntawm ua npuas ncauj.
Kev Kho Kom Sib Xws: Ua ib qho polymer nonionic, HEC zoo sib xws nrog anionic, cationic, thiab nonionic surfactants, tiv thaiv kev tsim cov qauv.
2. HEC Kev Ruaj Ntseg Mechanism
2.1. Kev Ruaj Ntseg Kub
HEC ua kom pom tseeb tias nws muaj kev ruaj khov zoo dua li feem ntau cov polymers ntuj. Hauv cov tshuaj lom neeg txhua hnub ntawm 25-50 ° C, HEC tswj tau cov qauv molecular ruaj khov thiab tsis yooj yim puas tsuaj.
Txawm tias nyob rau hauv kev tsim khoom kub siab (xws li thaum lub sijhawm yaj thiab cua sov) lossis qhov chaw khaws cia ntev, HEC-thickened systems tswj tau qhov viscosity zoo yam tsis muaj kev nyias nyias. Qhov cwj pwm no yog qhov tseem ceeb rau kev muag khoom ruaj khov ntawm cov tshuaj ntxuav thaum lub sijhawm thauj mus los kub siab lossis hauv cov khw muag khoom sab qab teb.
2.2. Kev Ruaj Ntseg Ionic
Cov kua ntxuav tais diav feem ntau muaj ntau yam ntsev inorganic (xws li sodium chloride thiab sodium sulfate) thiab cov khoom electrolyte. Cov ions no feem ntau ua rau cov nyhuv ntawm cov thickeners ib txwm tsis muaj zog. Txawm li cas los xij, ua ib qho polymer nonionic, HEC thickening kev ua tau zoo yuav luag tsis cuam tshuam los ntawm kev hloov pauv hauv electrolyte concentration.
Hauv cov tshuab ntsev siab, HEC tseem tswj tau qhov ruaj khov thiab pob tshab, tiv thaiv cov ntsev los nag thiab kev faib ua pawg hauv cov tshuaj ntxuav thaum lub sijhawm khaws cia.
2.3. Kev Ruaj Ntseg ntawm pH
Lub pH ntawm cov kua ntxuav tais diav feem ntau yog nruab nrab ntawm 6.5 thiab 8.5. HEC ua kom pom kev ruaj khov tshuaj zoo heev hauv qhov ntau no, tsis muaj kev puas tsuaj lossis kev ua haujlwm tsis zoo. Txawm tias nyob rau hauv qhov muaj cov tshuaj alkaline lossis acidic me ntsis hauv cov mis, HEC molecular saw hlau tswj cov dej noo, khaws cia qhov sib xws ntawm lub cev.
Tsis tas li ntawd xwb, qhov xwm txheej nonionic ntawm HEC zam kev cuam tshuam los ntawm kev hloov pauv pH, ua kom cov kua ntxuav tais diav tseem meej meej rau lub sijhawm ntev.
2.4. Kev Ruaj Ntseg Sib Xws
HEC ua kom pom tseeb tias nws sib haum zoo nrog ntau yam surfactants (xws li AES, LAS, APG, thiab lwm yam) yam tsis ua rau muaj flocculation lossis stratification. Nws cov saw hlau molecular tuaj yeem tsim kev sib cuam tshuam tsis zoo nrog surfactants hauv cov kua, yog li txhim kho qhov viscoelasticity thiab ua npuas ncauj ruaj khov ntawm lub kaw lus.
Hauv cov txheej txheem nyuaj uas muaj cov tshuaj tsw qab, cov xim, thiab cov tshuaj preservatives, HEC tswj tau qhov dispersibility zoo, tiv thaiv kev sib cais theem lossis nag lossis daus thaum lub sijhawm khaws cia ntev.
3. Cov Yam Tseem Ceeb Uas Cuam Tshuam Rau HEC Ruaj Khoov
3.1. Qib Kev Hloov Chaw (DS) thiab Qib Viscosity:
Cov HECs uas muaj qib siab hloov pauv muab kev yaj zoo dua thiab kev kam rau ntsev, ua rau lawv haum rau cov tshuaj ntxuav pob tshab; cov khoom uas muaj qib qis hloov pauv muaj peev xwm ua kom tuab dua tab sis kev ruaj khov qis dua me ntsis. Feem ntau, HECs nrog qhov nruab nrab mus rau siab viscosity (25000–60000 mPa·s) raug xaiv los ua kom sib npaug zoo dua ntawm kev tuab thiab pob tshab.
3.2. Cov Txheej Txheem Kev Yaj:
HEC yuav tsum tau muab faib ua ntej hauv dej txias, tom qab ntawd maj mam cua sov kom yaj tag, tsis txhob sib sau ua ke. Kev yaj tag nrho tuaj yeem ua rau muaj cov khoom me me lossis cov dej tsis huv hauv lub cev, yog li cuam tshuam rau kev ruaj khov ntawm cov mis.
3.3. Kev Tsim Cov Tshuaj Electrolyte Concentration:
Txawm hais tias HEC muaj kev kam rau ntsev zoo, qhov txo qis me ntsis hauv viscosity tseem yuav tshwm sim thaum cov electrolyte concentration hauv lub cev siab dhau (> 6% NaCl). Yog li ntawd, hauv cov qauv ntsev siab, qhov ntau ntawm HEC ntxiv yuav tsum tau nce ntxiv, lossis hloov kho HEC ntau yam yuav tsum tau xaiv.
3.4. Hom tshuaj surfactant:
Qhov sib xws ntawm HEC nrog cov txheej txheem surfactant sib txawv me ntsis. Piv txwv li, HEC ua kom pom kev ruaj khov zoo dua hauv LAS thiab AES systems; thaum nyob rau hauv cov kua ntxuav tais diav uas muaj APG, HEC thickening thiab suspending effects yog qhov tseem ceeb dua.
4. Cov txiaj ntsig ntawm HEC hauv cov kua ntxuav tais diav
Kev Pom Tseeb Siab: Cov kua dej uas yaj lawm yog qhov tseeb thiab pob tshab, tsis cuam tshuam rau qhov pom ntawm cov kua ntxuav tais diav.
Kev puas tsuaj zoo ntawm cov khoom siv hauv lub cev: Nws yog los ntawm cov cellulose ntuj, nws sib haum nrog cov qauv ntawm cov khoom siv tshuaj lom neeg ib puag ncig.
Kev Ua Khaus Qis: Nws tsis ua rau ua xua rau daim tawv nqaij thiab tsim nyog rau cov kua ntxuav tais diav me me.
Kev Sib Tw Dav Dav: Siv tau rau ntau hom kua ntxuav tais diav, xws li cov kua ntxuav tais diav nruab nrab, cov mis tshuaj uas muaj zog, thiab cov mis tshuaj uas muaj zog lossis tsawg.
HECTsis yog tsuas yog ib qho khoom ua kom tuab zoo hauv cov kua ntxuav tais diav xwb tab sis kuj yog ib qho tseem ceeb rau kev ruaj khov ntawm lub cev. Nws qhov kev ruaj khov thermal zoo heev, ionic stability, pH stability, thiab kev sib raug zoo ua kom cov kua ntxuav tais diav zoo nkauj thiab ua tau zoo thaum khaws cia, thauj mus los, thiab siv. Los ntawm kev xaiv cov hom HEC thiab cov txheej txheem ntxiv, qhov zoo tag nrho thiab kev sib tw ua lag luam ntawm cov kua ntxuav tais diav tuaj yeem txhim kho tau zoo heev. Yav tom ntej, nrog rau kev txhim kho kev tiv thaiv ib puag ncig ntsuab thiab kev siv tshuaj lom neeg ruaj khov, HEC yuav qhia txog kev siv dav dua hauv cov khoom siv ntxuav tais diav siab.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-03-2025