Hydroxyethyl cellulose (HEC) inonyungudika mumvura nonionic cellulose ether, uye sosi yayo huru ndeye yakasikwa cellulose. Natural cellulose inowanikwa zvakanyanya muzvirimwa uye ndicho chikamu chikuru chechirimwa masero madziro. Kunyanya, hydroxyethyl cellulose inogadzirwa nekemikari inogadzirisa selulosi yechisikigo ine ethylene oxide pasi pemamiriro ealkaline. Iyi kemikari yekuita maitiro inowanzodaidzwa kunzi ethoxylation, uye mhedzisiro ndeyekuti mapoka ehydroxyl ari echisikigo cellulose mamorekuru anotsiviwa zvishoma kana zvachose kuti aumbe hydroxyethyl cellulose nemapoka ethoxy.
Aya anotevera ndiwo matanho chaiwo egadziriro yegadziriro yehydroxyethyl cellulose:
Kwakabva cellulose: Cellulose inowanzotorwa kubva mumiti yemiti yakadai sekotoni nehuni. Iyo yakabviswa cellulose inonatswa uye yakasvibiswa kuti ibvise tsvina yakadai se lignin, hemicellulose uye zvimwe zvisiri-cellulose zvikamu kuti uwane high-purity cellulose.
Alkalinization treatment: Sanganisa cellulose neconcentrated sodium hydroxide (NaOH) solution, uye mapoka ehydroxyl ari mu cellulose anoita ne sodium hydroxide kugadzira sodium cellulose. Mukuita uku, iyo cellulose molecular chimiro inowedzera kune imwe nhanho, zvichiita kuti zvive nyore kuita ne ethylene oxide.
Ethoxylation reaction: Alkaized sodium cellulose inosanganiswa ne ethylene oxide (C2H4O) pane imwe tembiricha uye kumanikidza. Chimiro chemhete cheethylene oxide chinovhura kuita mapoka ethoxy (-CH2CH2OH), ayo anobatana nemapoka ehydroxyl pamamorekuru ecellulose kugadzira hydroxyethyl cellulose. Iyi yekuita maitiro inogona kuitwa kune akasiyana madhigirii, zvichikonzera hydroxyethyl cellulose ine madhigirii akasiyana ekutsiva.
Mushure mekurapa: Chigadzirwa mushure mekuita kazhinji chine alkali isina kubatwa, zvinonyungudutsa uye zvimwe ne-zvigadzirwa. Kuti uwane yakachena hydroxyethyl cellulose, mushure mekurapa matanho akadai se neutralization, kugeza uye kuomesa. Chinangwa chematanho ekurapa aya ndechekubvisa zvakasara alkali, zvinonyungudutsa uye ne-zvigadzirwa kuti uwane yekupedzisira yakanatswa chigadzirwa.
Hydroxyethyl cellulose yakashandiswa zvakanyanya mumaindasitiri akasiyana nekuda kwekusiyana kwayo kwemakemikari zvimiro uye kuita kwakanakisa. Kunyanya, hydroxyethyl cellulose ine yakanaka kunyungudika kwemvura, kukora, kugadzikana, kugadzira firimu uye lubricity, uye inowanzoshandiswa mundima dzinotevera:
Zvishandiso zvekuvaka: Muzvivakwa zvekuvaka, hydroxyethyl cellulose inonyanya kushandiswa seyakakora uye inochengetedza mvura mumiriri wesimende-based zvinhu uye gypsum-based materials. Inogona kunyatso kuvandudza kuita kwekuvaka kwezvinhu, kuvandudza kuchengetwa kwemvura, kushanda uye anti-sagging yedhaka, kuwedzera nguva yakavhurika uye kuve nechokwadi kufambira mberi kwakanaka kwekuvaka.
Indasitiri yependi: Mupendi, hydroxyethyl cellulose inoshandiswa seyakakora, inomisa mumiriri uye emulsifier kuvandudza rheology uye kugadzikana kwepende, kudzivirira pigment sedimentation, uye kuwedzera flatness uye kupenya kwejasi.
Cosmetics uye zvigadzirwa zvekuchengeta munhu: Muzvizoro, hydroxyethyl cellulose inowanzoshandiswa seyakakora, firimu rekare uye moisturizer. Inogona kupa zvigadzirwa nekunzwa kwakanaka, kuvandudza chigadzirwa kugadzikana uye kunamatira, uye kuwedzera moisturizing maitiro.
Indasitiri yemishonga: Mumunda wemishonga, hydroxyethyl cellulose inoshandiswa sechinhu chinobatsira pakugadzirira kwemishonga. Sechikamu chemapiritsi anoramba achiburitswa, mabhaisikopo efirimu, nezvimwewo, anogona kudzora kuburitswa kwezvinodhaka uye kugadzirisa kugadzikana uye bioavailability yemishonga.
Indasitiri yechikafu: Muindasitiri yechikafu, hydroxyethyl cellulose inoshandiswa sechikafu chekuwedzera kuita basa mukukora, emulsification uye kudzikamisa. Inoshandiswa zvakanyanya muzvinwiwa, condiments, zvigadzirwa zvemukaka uye zvimwe zvekudya kuvandudza magadzirirwo uye kuravira kwezvigadzirwa.
Hydroxyethyl cellulose ine zvakare yakakosha mashandisirwo mukuchera oiri, kugadzira mapepa, machira ekudhinda uye maindasitiri ekudhaya. Mukubvisa oiri, hydroxyethyl cellulose inoshandiswa seyakakora uye inodzikamisa yekuchera zvinwiwa, izvo zvinogona kuvandudza kugona kwekumisa kwemvura yekuchera uye kudzivirira kudonha kwemadziro. Muindasitiri yekugadzira mapepa, inoshandiswa semugadziri wekuchengetedza uye anosimbisa ajenti kuvandudza kusimba uye kusimba kwepepa. Mukudhinda machira uye dhayi, hydroxyethyl cellulose inoshandiswa seyakakora kubatsira kudhinda nekudhaya slurry kuti igoverwe zvakaenzana uye kuvandudza kudhinda nekudhaya mhando.
Hydroxyethyl cellulose inowanikwa kubva kune yakasikwa cellulose kuburikidza nekutevedzana kwemakemikari maitiro. Kushandiswa kwaro kwakakura hakusi chete nekuda kweakanakisa emuviri uye makemikari zvimiro, asi zvakare nekuti inogona kupa akasiyana mhinduro mumaindasitiri mazhinji kusangana neakasiyana hunyanzvi zvinodiwa.
Nguva yekutumira: Aug-13-2024