Hydroxyethyl cellulose (HEC) yakakosha mvura-inonyungudika cellulose ether, iyo inoshandiswa zvakanyanya mukuputira, kuchera mafuta, mishonga yemishonga nemimwe minda. Iyo yekunyungudika kwayo yakakosha yemuviri parameter inokanganisa kugadzirisa kwayo uye kushandiswa. Zvinhu zvinokanganisa nzvimbo yekunyungudika yehydroxyethyl cellulose inogona kukamurwa kuita akati wandei, senge mamorekuru chimiro, dhigirii rekutsiva, huremu hwemamorekuru, crystallinity, tsvina, uye mamiriro ezvakatipoteredza.
1. Chimiro chemolecular
Hydroxyethyl cellulose chigadzirwa che cellulose mushure me ethoxylation. Chimiro chayo ndechekuti maatomu ehydrogen ari mu cellulose morekuru anotsiviwa nemapoka ehydroxyethyl. Iyo chinzvimbo, nhamba uye kurongeka kwehydroxyethyl inotsiva ichakanganisa nzvimbo yayo yekunyungudika.
Kutsiva chinzvimbo: Yega yega glucose unit mu cellulose ine matatu hydroxyl mapoka anogona kutsiviwa. Kutsiva panzvimbo dzakasiyana kunoshandura chimiro chenzvimbo yemorekuru, zvichikanganisa nzvimbo yekunyungudika.
Nhamba yezvinotsiviwa: Kuwedzera kwenhamba yezvinotsiva kunowanzo kudzikisa iyo hydrogen bonding pakati pemamorekuru, nekudaro ichidzikisa nzvimbo yekunyungudika.
Kurongeka kweanotsiva marongero: Zvikamu zvinogoverwa zvisina tsarukano uye zvinogara zvichigoverwa zvinokanganisa zvakasiyana pakuchinjika uye kupindirana kwecheni yemamorekuru, zvichikanganisa nzvimbo yekunyungudika.
2. Dhigirii reKutsiva (DS)
DS inoreva avhareji yenhamba yehydroxyethyl inotsiva pane yega yega glucose unit. Iyo dhigirii yekutsiva ine yakakosha mhedzisiro pane inonyungudika, iyo inonyanya kuratidzwa mune zvinotevera zvinhu:
Low DS: Pazasi DS, iyo hydrogen bonding pakati pehydroxyethyl cellulose molecules yakasimba, zvichiita kuti mamorekuru anyatsosungwa uye nzvimbo yekunyunguduka ikwire.
Yakakwira DS: Yakakwira DS inowedzera kuchinjika kwemamorekuru uye inoderedza mhedzisiro yehydrogen bonding, zvichiita kuti mamorekuru ave nyore kutsvedza uye nzvimbo yekunyunguduka kudzika.
3. Molecular Weight
Huremu hwemamorekuru hune mhedzisiro yakananga pane inonyungudika yehydroxyethyl cellulose. Kazhinji, kukura kwehuremu hwema molecular, kureba kwecheni ye molecular, simba re van der Waals pakati pemamorekuru, uye rinowedzera kunyungudika. Uye zvakare, hupamhi hwekugovera huremu hwemamorekuru huchakanganisawo nzvimbo yekunyungudika, uye kugovera kwakakura kunogona kutungamira kune kusaenzana kunyungudika.
Yakakwira molecular uremu: Iwo mashetani echeni akareba, akanyanya kusungirirwa kune mumwe nemumwe, uye nzvimbo yekunyungudika yakakwira.
Low molecular uremu: The molecular cheni ipfupi, intermolecular masimba haana simba, uye kunyunguduka kwakaderera.
4. Crystallinity
Hydroxyethyl cellulose is amorphous polymer, asi inogona kunge ichine dzimwe nzvimbo dzakajeka. Kuvapo kwenzvimbo dzekristalline kunowedzera nzvimbo yekunyungudika nekuti chimiro chekristalline chakagadzikana uye chinoda simba rakawanda kutyora zvimiro zvakarairwa. Iyo dhigirii ye hydroxyethylation uye maitiro ekugadzirisa anokanganisa crystallinity yayo.
Yakakwira crystallinity: yakasimba chimiro, yakakwirira kunyungudika nzvimbo.
Yakaderera crystallinity: yakasununguka chimiro, yakaderera melting point.
5. Kusachena
Munguva yekugadzirwa kwehydroxyethyl cellulose, zvimwe zvigadziriso zvisina kubatwa, zvinokonzeresa kana ne-zvigadzirwa zvinogona kusara. Kuvapo kwezvisina kuchena izvi zvinogona kushandura intermolecular masimba, nekudaro zvichikanganisa nzvimbo yekunyungudika. Semuyenzaniso:
Residual catalyst: complexes inogona kuumbwa, kuchinja nzvimbo yekunyunguduka.
By-zvigadzirwa: Kuvapo kwezvakasiyana-zvigadzirwa kunoshandura kupindirana kwehurongwa uye kunokanganisa nzvimbo yekunyungudika.
6. Mamiriro ezvakatipoteredza
Mamiriro ekunze akadai setembiricha uye humidity anokanganisawo nzvimbo yekunyungudika yehydroxyethyl cellulose. Pasi pepamusoro humidity mamiriro, hydroxyethyl cellulose ichaita plasticization mushure mekutora mvura, iyo inoderedza simba re intermolecular uye kuderedza nzvimbo yekunyungudika.
Kupisa kwepamusoro: Inogona kukonzera kuora kwekupisa kwezvinhu uye kuwedzera nzvimbo yekunyungudika.
High humidity: Iyo molecular chain inonyanya kushanduka mushure mekutora mvura, uye nzvimbo yekunyunguduka inoderedzwa.
7. Kugadzira Technology
Iyo tembiricha, kugera simba, kuomesa mamiriro, nezvimwewo panguva yekugadziriswa kuchakanganisa kunyungudika kwechigadzirwa chekupedzisira. Mamiriro akasiyana ekugadzirisa anotungamira kune akasiyana ma molecular orientation uye crystallinity, iyo inozokanganisa nzvimbo yekunyungudika.
Kugadzirisa tembiricha: Kuwedzera kupisa tembiricha kunogona kukonzera kuderera kwechidimbu kana kuyambuka-kubatanidza, kushandura nzvimbo yekunyungudika.
Kuomesa mamiriro: Kuomesa nekukurumidza uye kunonoka kuomeswa kune akasiyana mhedzisiro pakurongeka kwemamorekuru, uye nzvimbo yekunyungudika ichave yakasiyana.
Muchidimbu, izvo zvinokanganisa nzvimbo yekunyungudika yehydroxyethyl cellulose zvinosanganisira mamorekuru chimiro, dhigirii rekutsiva, uremu hwemamorekuru, crystallinity, tsvina, mamiriro ekunze uye tekinoroji yekugadzirisa. Zvekushandisa zvinoshanda uye kugadzirisa, kutonga zvine musoro kwezvinhu izvi kunogona kukwidziridza mashandiro ehydroxyethyl cellulose uye kuita kuti isangane nezvinodiwa zvakasiyana zvekushandisa. Muchigadzirwa chekugadzira, kugadziridzwa kwesainzi kwezviyero izvi hakungodzore kunyungudika kwechigadzirwa, asiwo kunatsiridza kugadzikana uye kunaka kwechigadzirwa.
Nguva yekutumira: Jul-10-2024