01. Ukwethulwa kwe-cellulose
I-Cellulose yi-macromoleculate polysaccharide ehlanganiswe ushukela. Insoluble emanzini kanye nezinto ezijwayelekile ze-organic. Yingxenye esemqoka yodonga lweseli lwesitshalo, futhi futhi iyisimangaliso esatshalaliswa kakhulu futhi esiningi kakhulu se-polysaccharide ngokwemvelo.
I-Cellulose ingumthombo ojulile kakhulu wokuvuselela emhlabeni, futhi futhi yi-polymer yemvelo ngokuqongelela okukhulu kakhulu. Inezinzuzo zokuvuselelwa, i-biodegradable ngokuphelele, kanye nokubi okumnandi.
02 Izizathu Zokushintsha I-Cellulose
Ama-cellulose macromolecule aqukethe inani elikhulu lamaqembu we--oh. Ngenxa yomphumela wama-hydrogen bond, amandla aphakathi kwama-macromolecule akhulu, okuzoholela ekuncibilikeni okukhulu kwe-enthalpy △ h; Ngakolunye uhlangothi, kukhona izindandatho kuma-cellulose macromolecule. Njengesakhiwo, ubulukhuni be-chain molecular bukhulu, oluzoholela ekushintsheni okuncane okuncibilikayo okuncibilikayo Δ. Lezi zizathu ezimbili zenza izinga lokushisa le-molton cellulose (= △ H / △ s) lizobe liphezulu, futhi izinga lokushisa le-cellulose liphansi. Ngakho-ke, lapho i-cellulose ifudunyezwa emazingeni okushisa athile, kuzovela izithelo zokushisa ezibolile ngaphambi kokuthi iqale ukuncibilika, ngakho-ke, ukucubungula izinto zokwakha amaselula akukwazi ukwamukela indlela yokuncibilika kokuqala bese kubumba.
03. Ukubaluleka kokuguqulwa kwe-cellulose
Ngokuphatheka kancane kancane kwezinsizakusebenza zezinsalela kanye nezinkinga ezinkulu zemvelo ezibangelwa imfucumfucu yamakhemikhali yamakhemikhali, ukuthuthukiswa kanye nokusetshenziswa kwezinto zokwakha ezivuselelekayo ze-fiber ezivuselelekayo sekuyinye yezindawo ezishisayo abantu abanaka. I-Cellulose ingumthombo wemvelo ojulile kakhulu wemvelo ngokwemvelo. Inezakhiwo ezinhle kakhulu njengokuhlanzeka okuhle, ukuqina komoya okuqinile, okuqinile, okunamandla, ukugqokwa okunethezekile, ukucubungula okulula kwezindwangu, kanye ne-biodergadability. Inezici ezingenakuqhathaniswa nemicu yamakhemikhali. .
Ama-molecule we-cellulose aqukethe inani elikhulu lamaqembu ama-hydroxyl, okulula ukuwakha ama-intramogeemur kanye nama-hymolecular ama-hydrogen Bonds, futhi abole emazingeni okushisa aphezulu ngaphandle kokuncibilika. Kodwa-ke, i-cellulose inokuvunyelwa okuhle, futhi isibopho saso se-hydrogen singabhujiswa ukuguqulwa kwamakhemikhali noma ukulungiswa kwamakhemikhali, okunganciphisa ngempumelelo iphuzu lokuncibilika. Njengemikhiqizo ehlukahlukene yezimboni, isetshenziswa kabanzi ezimbonisweni, ukuhlukaniswa kukalwelwesi, amapulasitiki, ugwayi kanye nokugqoka.
04. I-CelLeliose Etherification Ukuguqulwa
I-Cellulose Ether uhlobo lokutholwa kwe-cellulose olutholwe ngokuguqulwa kwe-cellulose. Kusetshenziswa kabanzi ngenxa yokuqina kwayo okuhle, ukuqinisekiswa, ukumiswa, ukwakheka kwamafilimu, okuvikela i-colloid, ukugcinwa komswakama, kanye nezindawo zokubamba umswakama. Kusetshenziswe ekudleni, umuthi, ekwenziweni kwamaphepha, ukupenda, izinto zokwakha, njll.
Ukuchazwa kwe-cellulose kunguchungechunge lwezinto zokutholakala ezikhiqizwa ukusabela kwamaqembu ama-hydroxy ku-cellulose acate ane-cellulose ama-agences anama-alkaline ngaphansi kwezimo ze-alkali. Ukusetshenziswa kwamaqembu we-hydroxyl kunciphisa inani lama-intermolecular hydrogen bonds ukunciphisa amabutho we-intermolecular, ngaleyo ndlela kuthuthukise ukuqina okushisayo kwe-cellulose, ngcono ukusebenza kwezinto zokwakha, futhi ngasikhathi sinye ukunciphisa iphuzu lokuncibilika leselula.
Izibonelo zemiphumela yokuguqulwa kokuthengwa kweminye imisebenzi ye-cellulose:
Using refined cotton as the basic raw material, the researchers used a one-step etherification process to prepare carboxymethyl hydroxypropyl cellulose complex ether with uniform reaction, high viscosity, good acid resistance and salt resistance through alkalization and etherification reactions. Kusetshenziswa inqubo yokulandela i-One-stap, i-carboxyboxylopypropylylylylylylylylyl lyroses inokumelana nosawoti okuhle, ukumelana ne-acid kanye ne-solubity. Ngokushintsha amanani alinganayo we-propylene oxide kanye ne-chlororoacetic acid, imikhiqizo enezinto ezihlukile ze-carboxymethyl kanye nokuqukethwe kwe-hydroxypropyl kungalungiswa. Imiphumela yokuhlola ikhombisa ukuthi i-carboxymethyl hydroxyproppropyl celtulose ekhiqizwa yindlela eyodwa yezinyathelo inomjikelezo ofushane onomjikelezo ofushane, ukusetshenziswa okuphansi kwe-solvent, futhi umkhiqizo unokumelana kahle nosawoti ovusanayo nokwabangakile kanye nokuphikiswa okuhle kwe-acid.
I-05. Ithemba lokuguqulwa kwethebula le-cellulose
I-Cellulose iyinto ebalulekile yamakhemikhali kanye namakhemikhali eluhlaza onothile ngezinsizakusebenza, eziluhlaza nangokwemvelo, futhi zivuseleleke. Izithonjana zokuguqulwa kwe-cellulose ukuguqulwa zinokusebenza okuhle kakhulu, uhla olubanzi lokusebenzisa kanye nemiphumela emihle kakhulu, futhi uhlangabezane nezidingo zomnotho wezwe ngezinga elikhulu. Kanye nezidingo zentuthuko yezenhlalo, ngenqubekela phambili yezobuchwepheshe eqhubekayo kanye nokugcwaliseka kokuthengiswa kwezentengiselwano ngokuzayo, uma izinto zokwenziwa ze-culthetic nezindlela zokwenziwa ze-cellulose derivatives zingasebenza ngokwengeziwe, zizokwazi ukuthola izicelo ezibanzi kakhulu . Thanda
Isikhathi sePosi: Feb-20-2023