Ukulungiswa kwe-Hydroxyethyl cellulose

Ukulungiswa kwe-Hydroxyethyl cellulose

IHydroxyethyl cellulose (HEC) iyi-polymer encibilika emanzini esetshenziswa kabanzi ezimbonini ezahlukahlukene, kufaka phakathi ezokwakha, ukunakekelwa komuntu siqu, kanye nemithi. Ikhiqizwa ukuguqulwa kwamakhemikhali e-cellulose, okubandakanya ukufakwa kwamaqembu e-hydroxyl ochungechungeni lwe-cellulose ngamaqembu e-hydroxyethyl. Izinga lokushintshwa (DS) le-HEC lingahluka ukusuka ku-1.5 kuye ku-2.8, kuye ngesicelo.

Ukukhiqizwa kwe-HEC kuhilela izinyathelo ezimbalwa zokucwenga ukuze kuqinisekiswe ikhwalithi nokuvumelana komkhiqizo wokugcina. Lezi zinyathelo zihlanganisa:

1. Ukuhlanzwa kwe-cellulose: Isinyathelo sokuqala ekukhiqizeni i-HEC ukuhlanzwa kwe-cellulose. Lokhu kuhilela ukukhishwa kokungcola, okufana ne-lignin ne-hemicellulose, emthonjeni we-cellulose, okungaba i-pulp yokhuni noma i-cotton linters. Inqubo yokuhlanza ingase ihilele izinyathelo ezimbalwa, njengokugcoba, ukuwasha, nokuhlunga, kuye ngekhwalithi yomthombo we-cellulose.
2. Ukwelashwa nge-alkali: I-cellulose ehlanzekile ibe isiphathwa ngesisombululo se-alkali, njenge-sodium hydroxide noma i-potassium hydroxide, ukuze kwakheke i-alkali cellulose. Lesi sinyathelo siyadingeka ukulungiselela i-cellulose yesinyathelo esilandelayo, okuyi-etherification.
3. I-Etherification: I-alkali cellulose bese isabela nge-ethylene oxide ukukhiqiza i-HEC. Lokhu kusabela ngokuvamile kwenziwa phambi kwe-catalyst, njenge-sodium hydroxide noma i-sodium methylate, emazingeni okushisa aphezulu kanye nezingcindezi. Isikhathi sokusabela kanye nezinga lokushisa kulawulwa ngokucophelela ukuze kuzuzwe izinga elifiswayo lokushintshwa.
4. I-Neutralization: Ngemva kokusabela kwe-etherification, i-HEC iyancipha nge-asidi, njenge-acetic acid noma i-citric acid, ukulungisa i-pH ibe sezingeni eliphakathi nendawo. Lesi sinyathelo siyadingeka ukuze kuvinjelwe i-HEC ekwehliseni isithunzi ngokuhamba kwesikhathi.
5. Ukugeza nokomisa: I-HEC ibe isiwashwa futhi yomiswe ukuze kukhishwe noma yikuphi ukungcola okusalelayo kanye nomswakama. Inqubo yokomisa ngokuvamile yenziwa emazingeni okushisa aphansi ukuze kuvinjwe i-HEC ekonakalisweni.
6. Ukulawulwa kwekhwalithi: Isinyathelo sokugcina ekukhiqizeni i-HEC ukulawula ikhwalithi. I-HEC ihlolelwa amapharamitha ahlukahlukene, njenge-viscosity, okuqukethwe umswakama, nokuhlanzeka, ukuze kuqinisekiswe ukuthi ihlangabezana nemininingwane edingekayo yohlelo oluhlosiwe.

Ngaphezu kwalezi zinyathelo zokucwenga, kunezici ezimbalwa ezingathinta ikhwalithi nokusebenza kwe-HEC, okuhlanganisa:

1. I-Degree of substitution: Izinga lokushintsha (DS) le-HEC lingathinta ukuncibilika kwayo, i-viscosity, kanye nezakhiwo ze-gelation. I-DS ephakeme ingase ibangele i-HEC ebukekayo futhi efana nejeli, kuyilapho i-DS ephansi ingase ibangele i-HEC encibilika kakhulu futhi ewuketshezi.
2. Isisindo samangqamuzana: Isisindo samangqamuzana we-HEC singathinta i-viscosity yayo nokuziphatha kwesisombululo. Isisindo samangqamuzana esiphezulu singabangela i-HEC ye-viscous kanye ne-gel, kuyilapho isisindo esiphansi samangqamuzana singabangela i-HEC e-soluble ne-fluid.
3. Ukuhlanzeka: Ukuhlanzeka kwe-HEC kungathinta ukusebenza kwayo nokuzinza. Ukungcola, okufana ne-alkali esele noma i-catalyst, kungalulaza i-HEC ngokuhamba kwesikhathi futhi kuthinte ukunyibilika kwayo kanye ne-viscosity.
4. I-pH: I-pH yesisombululo se-HEC ingathinta ukuzinza kwayo kanye ne-viscosity. I-pH ephakeme kakhulu noma ephansi kakhulu ingabangela i-HEC ukuba ilulaze noma ilahlekelwe yi-viscosity yayo.

I-HEC ivame ukusetshenziswa njenge-thickener, binder, kanye ne-emulsifier ezimbonini ezihlukahlukene, ezihlanganisa ezokwakha, ukunakekelwa komuntu siqu, kanye nemithi. Embonini yezokwakha, i-HEC isetshenziswa njengesengezo emikhiqizweni esekwe usimende ukuthuthukisa ukusebenza, ukugcinwa kwamanzi, namandla okunamathela. Emikhiqizweni yokunakekelwa komuntu siqu, i-HEC isetshenziswa njenge-thickener ne-stabilizer

ukuze kuthuthukiswe ukuthungwa nokuzinza kokwakheka, njengama-shampoos, ama-lotions, nama-creams. Embonini yezemithi, i-HEC isetshenziswa njengesihlanganisi kanye ne-disintegrant ekwakhiweni kwamathebulethi.

Ukuqinisekisa ukusebenza okufunayo kwe-HEC kulezi zinhlelo zokusebenza, kubalulekile ukusebenzisa umkhiqizo wekhwalithi ephezulu oye wacwengwa futhi wahlolwa ukuze uhlangabezane nezicaciso ezidingekayo. Ngaphandle kwezinyathelo zokucwenga ezichazwe ngenhla, abakhiqizi bangase futhi basebenzise amasu engeziwe, njengokuhlunga, ukuze baqhubeke behlanza futhi bacwengisise i-HEC.

Sekukonke, ukucwengwa kwe-HEC kuyisinyathelo esibalulekile ekukhiqizeni kwayo ukuze kuqinisekiswe ukuthi umkhiqizo wokugcina uhlangabezana nemininingwane edingekayo yohlelo oluhlosiwe. Inqubo ibandakanya izinyathelo ezimbalwa, okuhlanganisa ukuhlanzwa kwe-cellulose, ukwelashwa kwe-alkali, i-etherification, i-neutralization, ukuwashwa nokomisa, nokulawula ikhwalithi. Izinga lokushintsha, isisindo samangqamuzana, ukuhlanzeka, kanye ne-pH ye-HEC konke kungathinta ukusebenza nokuzinza kwayo, futhi abakhiqizi kufanele balawule ngokucophelela lezi zici ukuze bakhiqize umkhiqizo wekhwalithi ephezulu. Ngokucwengisiswa okufanele nokulawulwa kwekhwalithi, i-HEC inganikeza izakhiwo ezibalulekile nezinzuzo ezinhlobonhlobo zezinhlelo zokusebenza.