Kunatswa kweHydroxyethyl cellulose

Kunatswa kweHydroxyethyl cellulose

Hydroxyethyl cellulose (HEC) ipolymer inonyungudika nemvura inoshandiswa zvakanyanya mumaindasitiri akasiyana siyana, kusanganisira kuvaka, kuzvitarisira, uye mishonga. Iyo inogadzirwa nekugadziriswa kwemakemikari ye cellulose, iyo inosanganisira kutsiviwa kwemapoka ehydroxyl pane cellulose cheni nemapoka ehydroxyethyl. Iyo dhigirii yekutsiva (DS) yeHEC inogona kusiyana kubva ku1.5 kusvika ku2.8, zvichienderana nekushandiswa.

Kugadzirwa kweHEC kunosanganisira matanho ekunatsa akawanda kuti ave nechokwadi chemhando uye kuenderana kwechigadzirwa chekupedzisira. Matanho aya anosanganisira:

1. Cellulose kucheneswa: Nhanho yekutanga mukugadzirwa kweHEC ndiko kucheneswa kweselulosi. Izvi zvinosanganisira kubviswa kwetsvina, senge lignin uye hemicellulose, kubva kune cellulose sosi, iyo inogona kuve yehuni pulp kana machira ekotoni. Iyo yekucheneswa inogona kusanganisira matanho akati wandei, senge bleaching, kugeza, uye kusefa, zvichienderana nemhando ye cellulose source.
2. Alkali kurapwa: Iyo yakacheneswa cellulose inobva yabatwa nealkali solution, yakadai sesodium hydroxide kana potassium hydroxide, kugadzira alkali cellulose. Iyi nhanho inofanirwa kugadzirira cellulose yedanho rinotevera, inova etherification.
3. Etherification: Iyo alkali cellulose inozoitwa ne ethylene oxide kugadzira HEC. Kuita uku kunowanzoitwa pamberi pechinhu chinokonzeresa, senge sodium hydroxide kana sodium methylate, pane tembiricha dzakakwirira uye kumanikidzwa. Iyo nguva yekuita uye tembiricha inodzorwa nekuchenjera kuti iwane dhigirii inodiwa yekutsiva.
4. Neutralization: Mushure mekuita kwe etherification, HEC inogadziriswa neasidhi, yakadai seacetic acid kana citric acid, kugadzirisa pH kusvika kune imwe nzvimbo. Iyi nhanho inofanirwa kudzivirira HEC kubva mukudzikisira nekufamba kwenguva.
5. Kusuka nekuomeswa: Iyo HEC inogezwa nekuomeswa kubvisa chero tsvina yakasara uye mwando. Iyo yekuomesa maitiro inowanzoitwa pakadzika tembiricha kudzivirira iyo HEC kubva pakusvibisa.
6. Kudzora kwehunhu: Nhanho yekupedzisira muHEC kugadzirwa ndeye kutonga kwemhando. Iyo HEC inoedzwa kune akasiyana ma paramita, senge viscosity, hunyoro hwemukati, uye kuchena, kuti ive nechokwadi chekuti inosangana nezvinodiwa zvekushandiswa kwakarongwa.

Pamusoro pematanho ekunatsa aya, pane akati wandei zvinhu zvinogona kukanganisa kunaka uye kuita kweHEC, kusanganisira:

1. Dhigirii rekutsiva: Iyo dhigirii yekutsiva (DS) yeHEC inogona kukanganisa kunyungudika kwayo, viscosity, uye gelation zvivakwa. A DS yakakwirira inogona kuguma kune viscous uye gel-seHEC, nepo DS yakaderera inogona kuguma nekunyanya kunyunguduka uye mvura HEC.
2. Molecular uremu: Iyo molecular huremu hweHEC inogona kukanganisa viscosity yayo uye kugadzirisa maitiro. Uremu hwepamusoro hwema molecular hunogona kuguma mune zvakanyanya viscous uye gel-seHEC, nepo yakaderera molecular uremu hunogona kuguma mune yakanyanya soluble uye fluid HEC.
3. Kuchena: Kuchena kweHEC kunogona kukanganisa kushanda kwayo uye kugadzikana. Zvisina kuchena, senge zvakasara alkali kana catalyst, zvinogona kukanganisa HEC nekufamba kwenguva uye zvinokanganisa kunyungudika kwayo uye viscosity.
4. pH: Iyo pH yeHEC mhinduro inogona kukanganisa kugadzikana kwayo uye viscosity. A pH yakanyanyisa kana yakaderera inogona kuita kuti HEC ideredze kana kurasikirwa neviscosity yayo.

HEC inowanzoshandiswa seyakakora, binder, uye emulsifier mumaindasitiri akasiyana siyana, anosanganisira kuvaka, kutarisira wega, uye mishonga yemishonga. Muindasitiri yekuvaka, HEC inoshandiswa sekuwedzera mune simende-yakavakirwa zvigadzirwa kuvandudza kushanda, kuchengetwa kwemvura, uye simba rekunamatira. Muzvigadzirwa zvekuchengetedza munhu, HEC inoshandiswa seyakakora uye inodzikamisa

kuvandudza magadzirirwo uye kugadzikana kwezvakagadzirwa, senge shampoos, lotions, uye makirimu. Muindasitiri yemishonga, HEC inoshandiswa sebhainda uye disintegrant mukugadzira mapiritsi.

Kuti uve nechokwadi chekushanda kunodiwa kweHEC mune izvi zvinoshandiswa, zvakakosha kushandisa chigadzirwa chepamusoro chakanatswa uye chakaedzwa kuti chisangane nezvinodiwa. Mukuwedzera kune matanho ekunatsa anotsanangurwa pamusoro apa, vagadziri vanogonawo kushandisa mamwe maitiro, akadai sefiltration, kuti awedzere kuchenesa nekugadzirisa HEC.

Pakazere, kunatsiridzwa kweHEC inhanho yakakosha mukugadzirwa kwayo kuti ive nechokwadi chekuti chigadzirwa chekupedzisira chinosangana nezvinodiwa zvekushandiswa kwakarongwa. Maitiro acho anosanganisira matanho akati wandei, anosanganisira cellulose kucheneswa, alkali kurapwa, etherification, neutralization, kugeza nekuomesa, uye kutonga kwemhando. Chiyero chekutsiva, uremu hwemamorekuru, kuchena, uye pH yeHEC zvese zvinogona kukanganisa kuita kwayo uye kugadzikana, uye vagadziri vanofanira kunyatso kudzora zvinhu izvi kuti vabudise chigadzirwa chemhando yepamusoro. Nekugadzirisa kwakakodzera uye kutonga kwehutano, HEC inogona kupa zvinhu zvinokosha uye zvikomborero mune zvakasiyana-siyana zvekushandisa.