I-Hydroxypropyl methylcellulosei-cellulose ether eyenzeka ngokwemvelo, engeyona ingozi emzimbeni womuntu. Kodwa-ke, izinto zokusetshenziswa zama-cotton linters kanye ne-HPMC ezisetshenziswa efektri zonke zinobuso, ngoba lokhu kuzoba nomthelela wothuli, kanti ezinye azilimazi.
IHydroxypropyl methylcellulose ayinabo ubuthi. I-Cellulose ibhekwa njengefanelekile futhi icutshungulwa ngokusebenzisa imicu eyenzeka ngokwemvelo ngokusebenzisa i-alkali fusion, ukuphendula ngokuxhunyelelwa, ukuwasha, ukomisa, ukugaya nezinye izinqubo. Ngeke kube yingozi impilo yabantu.
I-Hydroxypropyl methyl cellulose, eyaziwa nangokuthi i-hypromellose ne-cellulose hydroxypropyl methyl ether, yenziwa ngokusebenzisa i-cotton cellulose ecwenge kakhulu njengempahla eluhlaza futhi ithola i-etherification ekhethekile ngaphansi kwezimo ze-alkali.
Ukwenziwa kwe-hydroxypropyl methylcellulose: i-cotton cellulose ecolisisiwe iphathwa nge-lye ku-35-40 ℃ isigamu sehora, iyampintsha, i-cellulose iyachotshozwa, futhi ukuguga kwenziwa ngo-35 ℃ ukwenza i-alkali fibre etholakele i-polymerized ngokufanayo. Ngaphakathi kwebanga elidingekayo. Faka i-alkali fibre eketelani le-etherification, engeza i-propylene oxide ne-methyl chloride ngokulandelana, bese u-etherify ku-50-80℃ amahora angu-5, futhi ukucindezela okuphezulu cishe ku-1.8MPa. Bese wengeza inani elifanele le-hydrochloric acid ne-oxalic acid ukuze ugeze izinto emanzini ashisayo ku-90 ° C ukuze ukwandise ubukhulu nevolumu. Dehydrate by centrifugation. Swash ukuya kokungathathi hlangothi. Uma okuqukethwe kwamanzi kumpahla kungaphansi kuka-60%, yomise ngomoya oshisayo ofinyelela ku-130 ° C kuya kokuqukethwe okungaphansi kuka-5%.
I-HPMC ekhiqizwa indlela yokuncibilikisa isebenzisa i-toluene ne-isopropanol njengesinyibilikisi. Uma igezwa kabi kakhulu, izoba nephunga elincane elisele. Lena inkinga yenqubo yokugeza, engathinti ukusetshenziswa noma iyiphi inkinga.
I-Hypromellose wukotini ocolisisiwe ongavamile ukufakwa ngoketshezi ukuze kutholwe i-alkaline cellulose, bese ibamba iqhaza kuzincibilikisi, ama-etherification agents, i-toluene ne-isopropanol ukuze kutholakale i-etherification reactions, futhi ayithathi hlangothi, igezwe, yomiswe, futhi ichotshozwe ukuze kutholwe imikhiqizo eqediwe. Imbi kakhulu futhi iyanuka, ngakho abasebenzisi bangayisebenzisa esimweni esizinzile.
IHydroxypropyl methylcellulose kufanele inake lezi zinto ezilandelayo esicelweni:
Ngomphumela we-powder yodaka, i-hydroxypropyl methylcellulose idlala kuphela umphumela osekelayo, futhi ayihlanganyeli kunoma yikuphi ukusabela kwamakhemikhali. Impushana yodaka yengezwa ngamanzi bese ifakwa odongeni, okuwukusabela kwamakhemikhali. Ngenxa yokwakheka kwezinto ezintsha, impushana yodaka esodongeni ikhishwa odongeni futhi igaywe ibe yimpushana ukuze yenze izinto ezintsha. IHydroxypropyl methylcellulose igcina amanzi kuphela futhi isiza i-calcium empunga ukuthi ibe nokusabela okungcono, kodwa ayihlanganyeli kunoma iyiphi impendulo.
IHydroxypropyl Methyl Cellulose HPMC ayihlanganyeli kunoma yikuphi ukusabela kwamakhemikhali, kodwa iyasiza kuphela. Faka amanzi kumpuphu yodaka bese uyibeka odongeni, kuwukusabela kwamakhemikhali. Ngenxa yokwakheka kwezinto ezintsha, impushana yodaka odongeni ikhishwa odongeni futhi igaywe ibe yimpushana, futhi-ke akunakwenzeka, ngoba izinto ezintsha zenziwe i-NS. Izingxenye eziyinhloko ze-gray calcium powder yilezi: I-Ca(OH)2, ingxube ye-CaO kanye nenani elincane le-CaCO3, i-CaO
H2O=Ca(OH)2-Ca(OH)2 CO2=CaCO3↓ H2O
I-calcium empunga ikhiqiza ezinye izinto ngaphansi komphumela wamanzi kanye ne-CO2 emoyeni, kuyilapho i-HPMC igcina amanzi kuphela futhi isiza i-calcium empunga ukuba ibe nokusabela okungcono. Ayihlanganyeli kunoma iyiphi impendulo.
IHydroxypropyl methyl cellulose inezinhlobonhlobo zokusetshenziswa. Empilweni yansuku zonke, imikhiqizo eminingi ayinakuhlukaniswa nenqubo yokukhiqiza. Khona-ke, ezimbonini ezahlukene, uyini umphumela we-hydroxypropyl methylcellulose, ngizokuchazela, ukuze ukwazi ukuvimbela ukusetshenziswa kabi ngenkathi uthola ulwazi.
Okokuqala, embonini yezokwakha, ingathathwa njenge-retarder kanye ne-ejenti yokugcina amanzi. Udaka lodaka luyampompa, ngakho lonke udaka olomile esilusebenzisayo lunokuhlanganyela kwalo. Ngaphezu kwalokho, ezintweni zokwakha ezifana ne-gypsum eluhlaza, i-plaster, nempushana yodaka, ingasetshenziswa njenge-binder, engagcini nje ukwandisa isikhathi sokusebenza, kodwa futhi yenza upende ugcoke kakhulu. Emabula, amathayela e-ceramic anamathelayo, imihlobiso yepulasitiki ehlanganisiwe yamangqamuzana, ingasetshenziswa njengesithuthukisi sokunamathela, njll. Kungashiwo ukuthi i-hydroxypropyl methyl cellulose idume kakhulu ngokuhlukahluka kwayo ezintweni zokwakha.
Kwezinye izimboni, ezifana ne-porcelain kanye ne-pottery yokukhiqiza, ingasetshenziswa njenge-adhesive ekwenzeni imikhiqizo yobumba kanye ne-pottery; embonini ye-lacquer nokuphrinta uyinki, ingasetshenziswa njengempushana exekethile, i-thickener, i-stabilizer, futhi ngisho ngoba ingahlanganiswa ne-organic Solvent noma i-water blends kahle, futhi ingasetshenziswa njengesikhiphi sikapende ekwenzeni amapulasitiki ahlanganisiwe wamangqamuzana. , kanye nama-softeners, ama-ejenti akhulula isikhunta, izinto zokuthambisa, njll.; ekwenziweni kwe-polyvinyl chloride, ithathwa njengempushana exegayo.
Imikhiqizo eyenziwe nge-hydroxypropyl methylcellulose isetshenziswa kabanzi ekwenzeni izithelo nemifino, imithi, izikhumba zezilwane kanye nezimboni zendwangu. Iphephile futhi ayinabo ubuthi, ayicasuli kakhulu ulwelwesi lwamafinyila nezikhumba zomzimba womuntu, futhi ingasetshenziswa ngisho njengesithasiselo sokudla. Kodwa-ke, esimweni sangempela sendaba, uthuli lwayo lungabangela ukungcoliswa komoya, futhi akuzuzisi ukugcinwa kwesikhumba ukusihlukanisa nomlilo ukuze kugwenywe ukuqhuma.
ukugcinwa kwamanzi
I-hydroxypropyl methylcellulose ekhethekile yokwakha igwema ukusetshenziswa kwamanzi ngokweqile yi-substrate, futhi amanzi kufanele agcinwe ku-plaster ngangokunokwenzeka ngesikhathi lapho i-gypsum isethwe ngokuphelele. Lesi sakhiwo esikhethekile sibizwa ngokuthi ukugcinwa kwamanzi futhi silingana ngokuqondile ne-viscosity yesisombululo se-hydroxypropyl methylcellulose esetshenziselwa ukwakhiwa kusimende. Ukuphakama kwe-viscosity yesixazululo, kulapho umuzwa wokugcina amanzi ukhuphuka.
I-Anti-sagging
Udaka olunezici ezikhethekile ze-anti-sagging lungasetshenziswa nge-coating eqinile ngaphandle kokugubha, okusho futhi ukuthi udaka ngokwalo alushintshi ubulili balo, ngaphandle kwalokho luzoshelela phansi lapho ukwakhiwa kuqala.
Yehlisa i-viscosity futhi wenze lula ukwakhiwa
Ngemva kokwengeza imikhiqizo ehlukahlukene eqondene nokwakhiwa kwe-hydroxypropyl methylcellulose, ukhonkolo lwe-gypsum oluluhlaza olunesimo sengqondo esine-viscous esincane lungakhiqizwa. Uma kuthathwa njengokufanelekile futhi kusetshenziswa ibanga eliphansi le-viscosity ye-hydroxypropyl methylcellulose ethile yokwakha, Izinga le-viscosity liyancipha futhi ukwakha kuba lula. Kodwa-ke, ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose yokwakha i-viscosity ephansi kubuthakathaka, futhi kuyadingeka ukwandisa inani lokwengeza.
Izinga lokuhambisana kwepulasitiki
Ngenani elinqunyiwe lodaka olomile, ukonga kakhulu ukukhiqiza usayizi wodaka olumanzi ophezulu, ongafinyelelwa ngokungeza amanzi amancane namabhamuza. Kodwa-ke, uma inani lamanzi namabhamuza lide kakhulu, amandla awasebenzi.
Isikhathi sokuthumela: Apr-26-2024