Kugadzira hydroxyethyl cellulose (HEC) kunosanganisira nhevedzano yemakemikari maitiro ekugadzirisa cellulose, yakasikwa polymer inotorwa kubva muzvirimwa. HEC inoshandiswa zvakanyanya mumaindasitiri akasiyana siyana, anosanganisira emishonga, zvizorwa, chikafu, uye kuvaka, nekuda kwekukora, kudzikamisa, uye kuchengetedza mvura.
Nhanganyaya yeHydroxyethyl Cellulose (HEC)
Hydroxyethyl cellulose (HEC) isiri-ionic, mvura-inonyungudika polima inotorwa kubva muselulosi kuburikidza nekugadzirisa kemikari. Iyo inoshandiswa zvakanyanya seyakakora, gelling, uye inodzikamisa mumiriri mumaindasitiri akasiyana.
Raw Materials
Cellulose: Iyo yekutanga mbishi zvinhu zveHEC kugadzirwa. Cellulose inogona kutorwa kubva kune zvakasiyana-siyana zvemiti-based zvinhu zvakadai sehuni pulp, donje, kana masara ekurima.
Ethylene Oxide (EO): Kemikari yakakosha inoshandiswa kuunza mapoka e-hydroxyethyl pane cellulose musana.
Alkali: Kazhinji sodium hydroxide (NaOH) kana potassium hydroxide (KOH) inoshandiswa sechinhu chinokonzera mukuita.
Manufacturing Process
Kugadzirwa kweHEC kunosanganisira etherification ye cellulose ine ethylene oxide pasi pemamiriro ealkaline.
Matanho anotevera anotsanangura maitiro:
1. Pre-kurapwa Cellulose
Cellulose inotanga kucheneswa kubvisa tsvina yakaita se lignin, hemicellulose, uye zvimwe zvinyorwa. Iyo yakacheneswa cellulose inozoomeswa kune chaiyo mwando.
2. Etherification Reaction
Kugadzirira kweAlkaline Solution: An aqueous solution ye sodium hydroxide (NaOH) kana potassium hydroxide (KOH) yakagadzirirwa. Iko kusungirirwa kwealkali mhinduro yakakosha uye inoda kuvandudzwa zvichienderana nedhigirii yaidiwa yekutsiva (DS) yechigadzirwa chekupedzisira.
Reaction Setup: Yakanatswa cellulose yakaparadzirwa mune alkali mhinduro. Musanganiswa unodziyirwa kune imwe tembiricha, kazhinji inotenderedza 50-70 ° C, kuve nechokwadi chekuti cellulose yakazvimba zvachose uye inowanikwa kune iyo mhinduro.
Kuwedzerwa kweEthylene Oxide (EO): Ethylene oxide (EO) inowedzerwa zvishoma nezvishoma kumudziyo wekuita apo ichichengetedza kutonhora uye ichikurudzira nguva dzose. Maitiro acho ndeye exothermic, saka kudzora tembiricha kwakakosha kudzivirira kupisa.
Reaction Monitoring: Kufambira mberi kwekuita kunotariswa nekuongorora samples nguva nenguva. Matekiniki akaita seFourier-transform infrared spectroscopy (FTIR) anogona kushandiswa kuona dhigirii rekutsiva (DS) remapoka ehydroxyethyl pamusana we cellulose.
Neutralization uye Washing: Kana yaidiwa DS yaitwa, maitiro anodzimurwa nekuita neutralizing the alkaline solution neasidhi, kazhinji acetic acid. Mhedzisiro yeHEC inobva yashambidzwa zvakakwana nemvura kuti ibvise chero mareagents asina kugadziriswa uye tsvina.
3. Kucheneswa uye Kuomesa
Iyo HEC yakashambidzwa inocheneswa zvakare kuburikidza nefiltration kana centrifugation kubvisa chero tsvina yakasara. Iyo HEC yakacheneswa inozoomeswa kune chaiyo mwando yemukati kuti iwane yekupedzisira chigadzirwa.
Quality Control
Kudzora kwemhando kwakakosha mukati meHEC yekugadzira maitiro kuti ive nechokwadi chekuenderana uye kuchena kwechigadzirwa chekupedzisira. Zvikamu zvakakosha zvekutarisa zvinosanganisira:
Dhigirii rekutsiva (DS)
Viscosity
Hunyoro hwemukati
pH
Kuchena (kusavapo kwetsvina)
Maitiro ekuongorora akadai seFTIR, viscosity kuyerwa, uye yekutanga ongororo inowanzoshandiswa pakudzora kwemhando.
Kushandiswa kweHydroxyethyl Cellulose (HEC)
HEC inowana zvikumbiro mumaindasitiri akasiyana siyana nekuda kwemaitiro ayo akasiyana-siyana:
Pharmaceuticals: Inoshandiswa seyakakora mumiriri mukumisikidzwa kwemuromo, maumbirwo emusoro, uye inodzorwa-inoburitsa zvinodhaka dhizaini masisitimu.
Cosmetics: Inowanzo shandiswa mumakirimu, mafuta ekuzora, uye mashamposi seanokora uye anodzikamisa.
Chikafu: Yakawedzerwa kune zvigadzirwa zvekudya seyakakora uye gelling agent, emulsifier, uye stabilizer.
Kuvaka: Inoshandiswa musimende-based mortars uye grouts kuvandudza kushanda uye kuchengetedza mvura.
Mafungiro Ezvakatipoteredza uye Kuchengetedzwa
Environmental Impact: Kugadzirwa kweHEC kunosanganisira kushandiswa kwemakemikari akadai se ethylene oxide uye alkalis, iyo inogona kuva nemigumisiro yezvakatipoteredza. Kutarisira marara kwakakodzera uye kutevedzera mirau kwakakosha kuderedza kukanganisa kwezvakatipoteredza.
Kuchengeteka: Ethylene oxide igasi rinoshanda zvakanyanya uye rinopisa, rinoisa njodzi dzekuchengetedza panguva yekubata nekuchengetedza. Kupinda mhepo kwakaringana, midziyo yekudzivirira yemunhu (PPE), uye maprotocol ekuchengetedza zvinodiwa kuti uve nechokwadi chekuchengetedzwa kwevashandi.
Hydroxyethyl cellulose (HEC) ipolymer yakakosha ine akasiyana mashandisirwo mumaindasitiri kubva kumishonga kusvika pakuvaka. Kugadzirwa kwayo kunosanganisira etherification ye cellulose ine ethylene oxide pasi pemamiriro ealkaline. Matanho ekudzora emhando akakosha kuti ave nechokwadi chekuenderana uye kuchena kwechigadzirwa chekupedzisira. Mafungiro ezvakatipoteredza uye ekuchengetedza anofanirwawo kutariswa mukati memaitiro ese ekugadzira. Nekutevera maitiro nemaprotocol akakodzera, HEC inogona kugadzirwa zvine mutsindo uku ichideredza kukanganisa kwezvakatipoteredza uye kuve nechokwadi chekuchengetedzwa kwevashandi.
Iyi dhairekitori yakazara inovhara maitiro ekugadzira ehydroxyethyl cellulose (HEC) zvakadzama, kubva kune yakabikwa kusvika kune yemhando yepamusoro uye mashandisirwo, ichipa kunzwisiswa kwakakwana kweiyi yakakosha nzira yekugadzira polymer.
Nguva yekutumira: Kubvumbi-10-2024