I-Cellulose ether iyi-polymer yokwenziwa eyenziwe nge-cellulose yemvelo ngokuguqulwa kwamakhemikhali. I-Cellulose ether iyi-derivative ye-cellulose yemvelo. Ukukhiqizwa kwe-cellulose ether kuhlukile kuma-polymer okwenziwa. Izinto zayo eziyisisekelo yi-cellulose, i-polymer compound yemvelo. Ngenxa yokwakheka kwe-cellulose yemvelo, i-cellulose ngokwayo ayinawo amandla okusabela nama-etherification agents. Kodwa-ke, ngemva kokwelashwa kwe-ejenti yokuvuvukala, izibopho ezinamandla ze-hydrogen phakathi kwamaketanga e-molecule namaketanga ziyabhujiswa, futhi ukukhululwa okusebenzayo kweqembu le-hydroxyl kuba yi-reactive alkali cellulose. Thola i-cellulose ether.
Ku-mortar exubile ekulungele, inani lokwengeza le-cellulose ether liphansi kakhulu, kodwa lingathuthukisa kakhulu ukusebenza kwe-mortar emanzi, futhi liyisithasiselo esiyinhloko esithinta ukusebenza kokwakhiwa kwe-mortar. Ukukhetha okunengqondo kwama-ether e-cellulose ezinhlobo ezahlukene, ukuqina okuhlukile, ubukhulu bezinhlayiya ezahlukene, amazinga ahlukene e-viscosity kanye namanani engeziwe kuzoba nomthelela omuhle ekuthuthukisweni kokusebenza kwe-mortar e-dry powder. Njengamanje, ama-mortar amaningi okwakha ngobumba kanye nokufaka i-plaster anamandla okugcina amanzi, futhi i-slurry yamanzi izohlukana ngemva kwemizuzu embalwa yokuma.
Ukugcinwa kwamanzi kuwukusebenza okubalulekile kwe-methyl cellulose ether, futhi kungukusebenza okuqashelwa abakhiqizi abaningi be-dry-mix mortar basekhaya, ikakhulukazi labo abasezindaweni eziseningizimu ezinamazinga okushisa aphezulu. Izici ezithinta umphumela wokugcinwa kwamanzi we-dry mix mortar zihlanganisa inani le-MC elingeziwe, i-viscosity ye-MC, ubuncane bezinhlayiya kanye nokushisa kwendawo esetshenziswayo.
Izakhiwo zama-ether e-cellulose zincike ohlotsheni, inombolo kanye nokusatshalaliswa kwezinto ezithatha indawo. Ukuhlukaniswa kwama-ether e-cellulose kusekelwe ohlotsheni lwezinto ezithatha indawo, izinga lokushiswa kwe-ether, ukuncibilika kanye nezakhiwo zokusetshenziswa ezihlobene. Ngokohlobo lwezinto ezithatha indawo ku-molecule chain, ingahlukaniswa ibe yi-monoether kanye ne-ether exubile. I-MC esivame ukuyisebenzisa yi-monoether, kanti i-HPMC iyi-ether exubile. I-Methyl cellulose ether MC ingumkhiqizo ngemuva kokuthi iqembu le-hydroxyl kuyunithi ye-glucose ye-cellulose yemvelo lithathelwe indawo yi-methoxy. Ifomula yesakhiwo yi-[COH7O2(OH)3-h(OCH3)h]x. Ingxenye yeqembu le-hydroxyl kule yunithi ithathelwa indawo yiqembu le-methoxy, kanti enye ingxenye ithathelwa indawo yiqembu le-hydroxypropyl, ifomula yesakhiwo yi-[C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3] n]x I-Ethyl methyl cellulose ether HEMC, lezi yizinhlobo eziyinhloko ezisetshenziswa kakhulu futhi ezithengiswa emakethe.
Ngokuphathelene nokuncibilika, ingahlukaniswa ibe yi-ionic kanye ne-non-ionic. Ama-ether e-cellulose angewona i-ionic ancibilika emanzini akhiwe kakhulu uchungechunge olubili lwama-ether e-alkyl kanye nama-ether e-hydroxyalkyl. I-CMC ye-Ionic isetshenziswa kakhulu ekuhlanzeni okwenziwe ngezinto zokwenziwa, ekunyatheliseni nasekudayeni izindwangu, ekuhloleni ukudla namafutha. I-MC engewona i-ionic, i-HPMC, i-HEMC, njll. isetshenziswa kakhulu ezintweni zokwakha, ezimbozweni ze-latex, emithini, kumakhemikhali ansuku zonke, njll. Isetshenziswa njenge-thickener, i-ejenti yokugcina amanzi, i-stabilizer, i-dispersant kanye ne-ejenti yokwakha ifilimu.
Ukugcinwa kwamanzi kwe-cellulose ether: Ekukhiqizweni kwezinto zokwakha, ikakhulukazi udaka oluyimpuphu eyomile, i-cellulose ether idlala indima engenakuphindwa, ikakhulukazi ekukhiqizweni kodaka olukhethekile (udaka oluguquliwe), luyinto ebalulekile futhi ebalulekile. Indima ebalulekile ye-cellulose ether encibilikayo emanzini kudaka inezici ezintathu:
1. Amandla okugcina amanzi amahle kakhulu
2. Umphumela ekuqineni kwe-mortar kanye ne-thixotropy
3. Ukusebenzisana nesamente.
Umphumela wokugcina amanzi we-cellulose ether uncike ekumuncweni kwamanzi kwesendlalelo esiyisisekelo, ukwakheka kwe-mortar, ukujiya kwesendlalelo se-mortar, isidingo samanzi se-mortar, kanye nesikhathi sokusetha kwezinto zokusetha. Ukugcinwa kwamanzi kwe-cellulose ether uqobo kuvela ekuncibilikeni nasekuphelelweni kwamanzi kwe-cellulose ether uqobo. Njengoba sonke sazi, yize uchungechunge lwama-molecule e-cellulose luqukethe inani elikhulu lamaqembu e-OH anamanzi amaningi, aluncibiliki emanzini, ngoba isakhiwo se-cellulose sinezinga eliphezulu le-crystallinity. Amandla okumanzisa amanzi amaqembu e-hydroxyl kuphela awanele ukumboza izibopho ze-hydrogen ezinamandla kanye namandla e-van der Waals phakathi kwama-molecule. Ngakho-ke, luyavuvukala kuphela kodwa aluncibiliki emanzini. Lapho i-substituent ingeniswa kuchungechunge lwama-molecule, akuyona nje i-substituent ebhubhisa uchungechunge lwe-hydrogen, kodwa futhi ne-interchain hydrogen bond iyabhujiswa ngenxa yokuhlangana kwe-substituent phakathi kwamaketanga aseduze. Uma i-substituent inkulu, ibanga eliphakathi kwama-molecule liba likhulu. Uma ibanga liba likhulu. Uma umphumela wokubhubhisa izibopho ze-hydrogen umkhulu, i-cellulose ether iba yinto encibilikayo emanzini ngemva kokuba i-cellulose lattice inwebeka futhi isixazululo singena, sakhe isixazululo esinobuthi obukhulu. Lapho izinga lokushisa likhuphuka, ukumuncwa kwe-polymer kuyaba buthaka, futhi amanzi aphakathi kwamaketanga ayaxoshwa. Lapho umphumela wokuphelelwa amanzi emzimbeni wanele, ama-molecule aqala ukuhlangana, akhe ijeli yesakhiwo senethiwekhi enezinhlangothi ezintathu bese egoqwa.
Isikhathi sokuthunyelwe: Disemba-06-2022