I-Cellulose Ether iyi-polymer yokwenziwa eyenziwe kusuka ku-cellulose yemvelo ngokuguqulwa kwamakhemikhali. I-Cellulose Ether iyinto etholwa yiselula yemvelo. Ukukhiqizwa kwe-cellulose ether kuhlukile kwa-applemers zokwenziwa. Izinto zayo eziyisisekelo kakhulu ziyi-cellulose, i-polymer yemvelo yemvelo. Ngenxa yesehlakalo sesakhiwo semvelo se-cellulose, i-cellulose uqobo ayinakhono ukusabela nabenzeli bokuthembela. Kodwa-ke, ngemuva kokwelashwa kwe-ejenti yokuvuvukala, izibopho eziqinile ze-hydrogen phakathi kwamaketanga amamolekyuli namaketanga abhujisiwe, futhi ukukhishwa okusebenzayo kweqembu le-hydroxyl kuba yi-alkali cellulose esebenzayo. Thola i-cellulose ether.
Ngodaka lokuxubana olulungile, inani lokungezwa le-cellulose ether liphansi kakhulu, kepha lingathuthukisa kakhulu ukusebenza ngodaka olumanzi, futhi luyisengezo esikhulu esithinta ukusebenza kodaka. Ukukhetha okunengqondo kwezithambekela ze-cellulose yezinhlobo ezahlukahlukene, ama-viscosities ahlukene, ama-degree ahlukile wezinhlayiya, ama-degree ahlukene wokubonakala kanye namanani angeziwe azoba nomthelela omuhle ekuthuthukisweni koMuder oQinisekayo. Njengamanje, ama-masonry amaningi kanye nodaka oluphambayo banokusebenza okumpofu kokugcinwa kwamanzi, futhi ama-slurry amanzi azokwehlukanisa ngemuva kwemizuzu embalwa yokuma.
Ukugcinwa kwamanzi kungukusebenza okubalulekile kwe-methyl cellulose ether, futhi futhi kungukusebenza okuhlanganiswe nabakhiqizi bakaDotara baseDotara basekhaya, ikakhulukazi labo abaseningizimu nezifunda eziphakeme, naka. Izici ezithinta umphumela wokugcinwa kwamanzi wodaka olomile uhlanganisa inani le-MC elingeziwe, ubuciko be-MC, ubumba lwezinhlayiya kanye nokushisa kwendawo yokusebenzisa.
Izakhiwo ze-Cellulose Afers zincike ohlotsheni, inombolo kanye nokusatshalaliswa kwabangeniswa esikhundleni. Ukuhlukaniswa kwezithathela ze-cellulose futhi kususelwa ohlotsheni lwabantu abathile, izinga lokuthezeka, ukugcwala kanye nezinto ezihlobene nezicelo. Ngokusho kohlobo lokufakazelwa okufakwa esikhundleni se-molecular chain, kungahlukaniswa nge-monothert ne-ether exubile. I-MC sivame ukuyisebenzisa i-monother, futhi i-HPMC iyi-ether exubile. I-Methyl Cellulose Ether MC ngumkhiqizo ngemuva kweqembu le-hydroxyl kuyunithi le-glucose le-mortule yemvelo lifakwa esikhundleni se-methoxy. Ifomula yesakhiwo [CoH7O2 (oh) 3-H (OCH3) H] x. Ingxenye yeqembu le-hydroxyl kuyunithi lifakwa esikhundleni se-methoxy group, kanti enye ingxenye ithathelwa indawo yi-hydroxypropyl gerop, ifomula yesakhiwo [i-C6h7o2 (och2) m [och2ch (oh) ch3] n] x I-Ethlylyl cellulose ether hemc, lezi yizindlela eziphambili ezisetshenziswa kabanzi futhi zithengiswe emakethe.
Ngokuya nge-solubity, ingahlukaniswa nge-ionic ne-nonic. Izithambiso ze-Sulluble Sulloble Cellulose ezingezona zamanzi zihlanganiswa ngokukhethekile ngochungechunge lwe-ALKYL TETER NE-HYDROXYallyl. I-Ionic CMC isetshenziswa ikakhulukazi ezihlalweni zokwenziwa, ukuphrinta kwendwangu nokudaya, ukudla kanye nokuhlola uwoyela. I-Non-ionic MC, i-HPMC, i-hemc, njll. Isetshenziswa ikakhulukazi ezintweni zokwakha, ukumboza amakhemikhali we-latex, njll. Isetshenziswa njenge-getriner, i-ejenti yokugcina amanzi, i-stabilizer, i-despilizersant kanye nefilimu ephethe i-ejenti.
Ukugcinwa kwamanzi kwe-cellulose ether: Ekukhiqizweni kwezinto zokwakha, ikakhulukazi udaka owomile, i-ether ye-cellulose idlala indima engenakufinyeleleka, ikakhulukazi ekhiqizweni lodaka olukhethekile (udaka olushintshiwe), kuyinto ebaluleke kakhulu futhi ebalulekile. Indima ebalulekile ye-cellulose ether ether ether ngodaka ikakhulukazi inezici ezintathu:
1. Umthamo omuhle kakhulu wokugcina amanzi
2
3. Ukuxhumana nosimende.
Ukutholwa kokugcinwa kwamanzi kwe-cellulose ether kuncike ekufakweni kwamanzi kwesendlalelo sesisekelo, ukwakheka kodaka, ukushuba kongqimba lwesidakamizwa, ukufunwa kwamanzi ngodaka, kanye nesikhathi sokubeka izinto ezibonakalayo. Ukugcinwa kwamanzi kwe-cellulose ether ngokwako kuvela ku-solubity kanye nokuwohloka komzimba kwe-cellulose ether uqobo. Njengoba sonke sazi, yize i-cellulose molecular chain iqukethe inani elikhulu lamaqembu ah ama-oh ah, ayincibiliki emanzini, ngoba isakhiwo se-cellulose sine-crystallity ephezulu. Ikhono le-hydration lamaqembu we-hydroxyl ilodwa akwanele ukumboza izibopho eziqinile ze-hydrogen kanye ne-van der Waals amabutho phakathi kwama-molecule. Ngakho-ke, kudumba kuphela kepha kungancibiliki emanzini. Lapho kungeniswa esikhundleni esibangeni lamangqamuzana, hhayi nje kuphela ukuthi okufakwayo kubhubhise i-hydrogen chain, kodwa futhi nesibopho se-hydrogen sibhujiswa ngenxa yokwehla kwamaketanga aphansi phakathi kwamaketanga aphansi. Okukhudlwana, kukhudlwana ibanga phakathi kwama-molecule. Okukhulu ibanga. Uma kwenzeka kuba nomphumela wokubhubhisa ama-hydrogen bond, i-cellulose ether iba ukuncibilika kwamanzi ngemuva kokuthi isixazululo se-cellulose sinwebeka futhi kwakha isixazululo sokulungiselela. Lapho izinga lokushisa likhuphuka, i-hydrate ye-polymer yenza buthaka, amanzi phakathi kwamaketanga axoshwa. Lapho umphumela we-dehydration wanele, ama-molecule aqala ukuhlanganisa, akha i-gel yenethiwekhi enezinhlangothi ezintathu bese esongelwa.
Isikhathi Sokuthumela: Dec-06-2022