I-Cellulose Ether iyi-polymer yokwenziwa eyenziwe nge-cellulose yemvelo njengento eluhlaza ngokuguqulwa kwamakhemikhali. I-Celsulose Ether iyisisulu semvelo ye-cellulose yemvelo, ukukhiqizwa kwe-cellulose ether kanye ne-polymer yokwenziwa kwehlukile, impahla yayo eyisisekelo kakhulu yi-cellulose, amakhompiyutha e-polymer asemqoka. Ngenxa yesehlakalo sesakhiwo se-cellulose yemvelo, iselula ngokwalo akunakhono ukuphendula nge-ejenti ethembisayo. Kepha ngemuva kokwelashwa kwe-ejenti yokuvuvukala, izibopho eziqinile ze-hydrogen phakathi kwamaketanga ama-molefaner namaketanga akhishwe e-Alkali Cellulose enekhono lokuphendula, futhi kwatholakala ukusabela kwe-ejenti ethempelayo - noma iqembu.
Izakhiwo ze-Cellulose Afers zincike ohlotsheni, inombolo kanye nokusatshalaliswa kwabangeniswa esikhundleni. Ukuhlukaniswa kwe-cellulose ether nakho kususelwa ohlotsheni lwabantu abaningi, izinga lokuthezeka, ukulekelela kanye nesicelo esihlobene kungahlukaniswa. Ngokusho kohlobo lokufakazelwa ohlolweni olwenziwe ngokomusi wamangqamuzana, lungahlukaniswa lube yi-ether eyodwa ne-ether exubile. I-MC ivame ukusetshenziswa njenge-ether eyodwa, ngenkathi i-HPMC iyi-ether exubile. I-Methyl Cellulose Ether MC iyunithi yemvelo ye-cellulose yemvelo ku-hydroxyl yi-methoxide ithathelwe indawo yefomula yoMkhiqizo [HYDROXYPROPY MATHELL Cellulose iyunithi ye-hydroxyl iyingxenye ye-methoxide ithathelwe indawo, enye ingxenye ye-hydroxypropp efakwe esikhundleni somkhiqizo, ifomula yehlela [C6h7o2 (och3) m [och2ch (oh2) m [och2ch (oh) meth3] n] x ne-hydroxyethyl methyl cellulose, esetshenziswa kabanzi futhi wathengiswa emakethe.
Ukusuka e-solubinile kungahlukaniswa ngohlobo lwe-ionic nohlobo olungelona olungelona i-ionic. I-ether esondelana yamanzi ye-mollulose ye-ionic ihlanganiswa ikakhulukazi i-ALKYL ether kanye ne-hydroxyl alkyl ether ama-uchungechunge lwezinhlobo ezimbili. I-Ionic CMC isetshenziswa ikakhulukazi ku-sonthetic detergent, izindwangu, ukuphrinta, ukudla kanye nokuxhashazwa kukaphethiloli. I-Non-ionic MC, i-HPMC, i-hemc nezinye ikakhulukazi ezisetshenziswa ezintweni zokwakha, ukumboza kwe-latex, umuthi, amakhemikhali nsuku zonke nezinye izici. Njenge-ejenti ekhuthele, i-ejenti yokugcinwa kwamanzi, i-Stabilizer, Dispersant, i-ejenti eyakheka amafilimu.
Ukugcinwa kwamanzi kwe-Cellulose ether
Ekwenziweni kwezinto zokwakha, ikakhulukazi udaka owomile oluhlanganisiwe, i-ether ye-cellulose idlala indima engenakufinyeleleka, ikakhulukazi ekukhiqizweni kodaka olukhethekile (udaka olushintshiwe), ingxenye ebalulekile.
Indima ebalulekile ye-cellule cellulose ether e-motar ikakhulukazi inezici ezintathu kakhulu, enye ikhono lokugcina lamanzi, okwesibili yithonya lokungaguquguquki kodaka ne-Thixotropy, kanti okwesithathu kungukuxhumana nosimende.
Ukugcinwa kwamanzi kwe-cellulose ether, kuya ngesisekelo se-hydroscopicity, ukwakheka kodaka, ukubhema ungqimba, ukufunwa kwamanzi ngodaka, isikhathi sokuvulwa kwezinto ezibonakalayo. Ukugcinwa kwamanzi kwe-cellulose ether kuvela ku-solubility kanye nokuwohloka kwamapheko we-cellulose ether uqobo. Kuyaziwa ukuthi amaketanga ama-cellulose ama-cellulose, yize aqukethe inani elikhulu lamaqembu ah oh ohweliwa ama-oh, awonakalisiwe emanzini ngenxa yesakhiwo sawo se-crystalline. Ikhono le-hydration lamaqembu we-hydroxyl ilodwa akwanele ukukhokhela izibopho eziqinile ze-hydrogen ze-hydrogen ne-van der Waals. Lapho kufakazelwa kufaka phakathi ku-chain molecular, hhayi kuphela ukubandakanywa kwe-hydrogen, kepha futhi nezibopho ze-hydrogen ziphukile ngenxa yokushaywa kwamaketanga aphansi phakathi kwamaketanga aphansi. Okukhudlwana okubandayo, kukhudlwana ibanga phakathi kwama-molecule. Lapho kukhuphuka kwe-Hydrogen Bond Effect effect, i-cellulose lattice ukwanda, ikhambi elise-cellulose ether liba manzi-solul. Njengoba izinga lokushisa likhuphuka, i-hydrate ye-polymer iyancipha futhi amanzi aphakathi kwamaketanga axoshwa. Lapho umphumela wokuphamba womoya wanele, ama-molecule aqala ukuhlanganisa futhi ijeli liphuma kwinethiwekhi enezici ezintathu. Izici ezithinta ukugcinwa kwamanzi ngodaka zifaka ukubonakala kwe-cellulose ether, umthamo, izinhlayiyana zokuthola izinhlayiyana kanye nokushisa kwensiza.
Lapho kukhula i-viscosity ye-cellulose ether, ingcono ukusebenza kokugcinwa kwamanzi, i-viscosity yesixazululo se-polymer. Isisindo se-molecular (degree of polymerization) se-polymer sinqunywa ngobude kanye ne-molephology yesakhiwo samangqamuzana se-chain, kanye nokusatshalaliswa kwenombolo yabamele [ETA] = km alpha
I-Intrinsic Viscosite Yezixazululo Ze-Polymer
M isisindo se-polymer molecular
α Polymer isimilo njalo
K i-viscosity yesisombululo sokulungiselela
I-viscosity yekhambi le-polymer incike esimeni se-polymer. I-viscosity kanye nokuhlushwa kwe-cellulose etr Solutions kuhlobene nezinhlelo zokusebenza ezahlukahlukene. Ngakho-ke, i-ether ngayinye ye-cellule
Ngobukhulu bezinhlayiyana, abahle kakhulu, okungcono ukugcinwa kwamanzi. Izinhlayiya ezinkulu ze-cellulose ether zithintana namanzi, ingaphezulu lincibilika futhi zakha ijeli ukuyosonga izinto zokuvimbela ama-molecule wamanzi ekuqhubekeni nasekuchithweni kwezixazululo ezinodaka noma Agglomerate. I-solubility ye-cellulose ether ingenye yezinto ukukhetha i-cellulose ether.
Ukuqina kanye ne-thixotropy ye-cellulose ether
Umphumela wesibili we-cellulose ether - ukuqina kuncike ku: cellulose ether polymerization degree, ukugxila kwesixazululo, izinga lokushisa kanye nezinye izimo. Impahla ye-gelation yesixazululo ihlukile ku-ALKYL Cellulose kanye nama-derivatives alo aguquliwe. Izici ze-gelation zihlobene ne-degree yokufaka esikhundleni, okuhlushwa izixazululo kanye nezithasiselo. Nge-Hydroxyl Alkyl Derivatives eguquliwe, izakhiwo ze-gel nazo zihlobene nezinga le-hydroxyl alkyl ukuguqulwa. Ukuze isixazululo sokuhluzwa kwesixazululo se-votive solution MC ne-HPMC singalungiswa ngo-10% -15% Isixazululo Sokuhlushwa, I-Medium Viscusity MC kanye ne-HPMC Isixazululo kanye ne-HPMC kuphela ilungiselelwe 2% -3% kuphela Isixazululo, futhi imvamisa ukubonakala kwe-cellulose ether nakho kufakwe isisombululo esingu-1% -2%. Isisindo esiphakeme se-molecular cellulose ethener ethener, ukugcwala okufanayo, ama-polymers ahlukile wesisindo ane-viscosity ehlukile, i-viscosity kanye nesisindo samangqamuzana angavezwa kanjena, [DPN) 0,9N), i-DPN ingu-0.905, i-DPN iyisilinganiso I-Polymerization degree ephezulu. Isisindo esiphansi se-molecular celvulosise i-ether ukufaka ngaphezulu ukufeza ukubonwa okuqondiwe. I-viscosity yayo incike kakhulu ekulinganiselweni kwe-Shear, i-viscosity ephezulu yokufeza i-viscosity okuqondiwe, inani elidingekayo ukwengeza okuncane, ukubonana kuncike ekusebenzeni kahle. Ngakho-ke, ukufeza ukungaguquguquki okuthile, inani elithile le-cellulose ether (ukugxila kwesixazululo) kanye nokuvunywa kwesisombululo kumele kuqinisekiswe. Ukushisa kwe-gelation kwekhambi kwehlise ngokuqondile ngokusobala ngokwanda kokuqoqwa kwesixazululo, kanye ne-gelation kwenzeka emazingeni okushisa asekamelweni ngemuva kokufinyelela kokuhlushwa okuthile. I-HPMC inokugxila okuphezulu kwe-gelation kumazinga okushisa asekamelweni.
Ukuvumelana kungashintshwa futhi ngokukhetha usayizi wezinhlayiyana nezinhlanga ze-cellulose ezinamazinga ahlukene wokuguqulwa. Ukubizwa okubizwa ngokuthi ukuguqulwa kungeniswa kweHydroxyl Alkyl Group ngezinga elithile lokufaka esikhundleni sesakhiwo se-Skeleton se-MC. Ngokushintsha amanani wokufakwa esikhundleni salezi zinto ezimbili, okungukuthi, amanani wokufakwa esikhundleni se-DS kanye ne-MS kanye nama-HYDROXYL. Izakhiwo ezahlukahlukene ze-cellulose ether ziyadingeka ngokushintsha amanani wokufakwa kwezihlobo ezimbili zezinhlobo ezimbili zokufakaza.
ubudlelwano phakathi kokuvumelana nokuguqulwa. Ku-Figure 5, ukungezwa kwe-cellulose ether kuthinta ukusetshenziswa kwamanzi kodaka futhi kushintsha isilinganiso samanzi samanzi namanzi, okuwumphumela wokuqina. Lapho kuphakama umthamo, ukusetshenziswa kwamanzi okuningi.
I-Cellulose Tathers esetshenziselwa izinto zokwakha i-powdery kumele ichitheke ngokushesha emanzini abandayo futhi inikeze uhlelo ngokuvumelana okulungile. Uma izinga elinikeziwe le-Shear lise-flocculent futhi colloidal kungumkhiqizo ongaphansi noma ongemuhle.
Kukhona nobudlelwano obuhle obuqondile phakathi kokuguquguqulwa kosimende kanye nodoba lwe-cellulose ether, i-cellulose ether ingakhulisa kakhulu ukubonwa kodaka, kukhulu umthamo, umphumela osobala.
Isixazululo esinamanzi ekhefu ane-ether nge-viscoty ephezulu ine-thixotropy ephezulu, okungenye yezimpawu ze-cellulose ether. Izisombululo zamanzi ezinamanzi ze-MC Type Polymers zivame ukuba ne-pseudoplastic, i-non-Thixotropic uketshezi ngaphansi kwezinga lokushisa le-gel, kodwa izakhiwo ze-Newtonia ezigeleza ngamanani aphansi. I-Pseudoplaltity inyuka ngokwanda kwesisindo se-molecular noma ukugxila kwe-cellulose ether futhi izimele ngohlobo lwe-substituent kanye neziqu. Ngakho-ke, ama-surlulose afers webanga elifanayo lokubonana, noma ngabe i-MC, HPMC noma i-hemc, ngaso sonke isikhathi akhombisa izakhiwo ezifanayo zembobo inqobo nje uma izinga lokuhlanza nokushisa kuhlala kuhlala kuhlale. Lapho izinga lokushisa likhuphuka, kwakhiwa i-GELTIAL GEL futhi i-Thixotropic Flow yenzeka. I-Cellulose Tashers enokuhlushwa okuphezulu nokuvunyelwa okuphansi i-Thixotropy ngisho nangaphansi kwe-gel lokushisa. Le mpahla inzuzo enkulu ekwakhiweni kokwakha udaka ukuze kuguqulwe ukugeleza kwayo nokugeleza kwempahla. Kudinga ukuchazwa lapha ukuthi ukukhuphuka kwendlela kaCellulose Ether, kungcono ukugcinwa kwamanzi, kepha kukhuphuka isisindo esiphakeme, ukwehliswa okuhambisanayo kwe-solubelity yayo, enomthelela omubi ukusebenza kodaka nokusebenza kokwakha. Lapho kuphakama i-viscosity, kusobala kakhulu umphumela wodaka, kepha akulona ubudlelwano obuphelele obulinganayo. Ukubonakaliswa okuphansi, kepha kuguqulwe i-cellulose ether ekuthuthukiseni amandla enhlaka kasimende olumanzi kunokwenza okuhle kakhulu, ngokwanda kokugcinwa kwamanzi, ukugcinwa kwamanzi we-cellulose ether.
Isikhathi sePosi: Mar-30-2022