I-Hydroxypropyl methylcelluloseiyi-ether ye-cellulose eyenzeka ngokwemvelo, engeyona ingozi emzimbeni womuntu. Kodwa-ke, izinto zokusetshenziswa ze-cotton linters kanye ne-HPMC ezisetshenziswa efektri ziwubuso bonke, ngoba lokhu kuzoba nomphumela wothuli, kanti okunye akulona ingozi.
I-Hydroxypropyl methylcellulose ayiyona into enobuthi. I-Cellulose ibhekwa njengefanele futhi icutshungulwa ngokusebenzisa imicu yemvelo ngokusebenzisa i-alkali fusion, impendulo yokufakelwa, ukuwasha, ukomisa, ukugaya nezinye izinqubo. Ngeke ibeke impilo yabantu engozini.
I-Hydroxypropyl methyl cellulose, eyaziwa nangokuthi i-hypromellose kanye ne-cellulose i-hydroxypropyl methyl ether, yenziwa ngokusebenzisa i-cotton cellulose emsulwa kakhulu njengezinto zokusetshenziswa futhi idlula etherification ekhethekile ngaphansi kwezimo ze-alkaline.
Ukwenziwa kwe-hydroxypropyl methylcellulose: i-cellulose yekotini ecwengekile iphathwa nge-lye ku-35-40℃ isigamu sehora, icindezelwe, i-cellulose iyachotshozwa, bese ukuguga kwenziwa ku-35℃ ukuze kwenziwe i-alkali fiber etholakele ibe yi-polymer efanayo. Ngaphakathi kobubanzi obudingekayo. Faka i-alkali fiber eketheni ye-etherification, engeza i-propylene oxide ne-methyl chloride ngokulandelana, bese u-etherify ku-50-80℃ amahora ama-5, kanti ingcindezi ephezulu ingaba ngu-1.8MPa. Bese ufaka inani elifanele le-hydrochloric acid ne-oxalic acid ukuze ugeze izinto emanzini ashisayo ku-90°C ukuze wandise usayizi kanye nevolumu. Khipha amanzi ngokufaka amanzi emzimbeni. Geza kuze kube yilapho kungathathi hlangothi. Uma okuqukethwe kwamanzi ezintweni kungaphansi kuka-60%, komise ngomoya oshisayo ku-130°C kuze kube okuqukethwe okungaphansi kuka-5%.
I-HPMC ekhiqizwa yindlela yokuncibilikisa isebenzisa i-toluene ne-isopropanol njengesincibilikisi. Uma ihlanzwe kabi kakhulu, izoba nephunga elincane elisele. Lena inkinga yenqubo yokuwasha, engathinti ukusetshenziswa noma iyiphi inkinga.
I-Hypromellose ikotini elicwengekile elingavami ukufuthwa ngoketshezi ukuze kutholakale i-alkaline cellulose, bese lihlanganyela ezincibilikisini, izinto ezibangela ukushiswa kwe-ether, i-toluene kanye ne-isopropanol ukuze kutholakale ukusabela kwe-etherification, futhi liyasuswa, ligezwe, lomiswe, futhi lichotshozwe ukuze kutholakale imikhiqizo eqediwe. Libi kakhulu futhi linephunga elimnandi, ngakho abasebenzisi bangalisebenzisa ngesimo esizinzile.
I-Hydroxypropyl methylcellulose kufanele inake izinto ezilandelayo ekusetshenzisweni:
Emsebenzini wempuphu yodaka, i-hydroxypropyl methylcellulose idlala kuphela umphumela wokusekela, futhi ayihlanganyeli kunoma yikuphi ukusabela kwamakhemikhali. Impuphu yodaka yengezwa ngamanzi bese ifakwa odongeni, okuyimpendulo yamakhemikhali. Ngenxa yokwakheka kwezinto ezintsha, impuphu yodaka odongeni isuswa odongeni bese igaywa ibe yimpuphu ukuze kwakhiwe izinto ezintsha. I-Hydroxypropyl methylcellulose igcina amanzi kuphela futhi isiza i-gray calcium ukuthi ibe nokusabela okungcono, kodwa ayihlanganyeli kunoma yikuphi ukuphendula.
I-Hydroxypropyl Methyl Cellulose I-HPMC ayihlanganyeli kunoma yikuphi ukusabela kwamakhemikhali, kodwa iyasiza kuphela. Faka amanzi ku-mud powder bese uyibeka odongeni, kuyi-chemical reaction. Ngenxa yokwakheka kwezinto ezintsha, i-mud powder odongeni isuswa odongeni bese igaywa ibe yi-powder, bese kungenzeki, ngoba izinto ezintsha sezenziwe i-NS. Izingxenye eziyinhloko ze-gray calcium powder yilezi: i-Ca(OH)2, ingxube ye-CaO kanye nenani elincane le-CaCO3, i-CaO3
H2O=Ca（OH）2-Ca（OH）2 CO2=CaCO3↓ H2O
I-calcium empunga ikhiqiza ezinye izinto ngaphansi komthelela wamanzi ne-CO2 emoyeni, kuyilapho i-HPMC igcina amanzi kuphela futhi isiza i-calcium empunga ukuthi ibe nempendulo engcono. Ayihlanganyeli kunoma iyiphi impendulo.
I-Hydroxypropyl methyl cellulose inokusetshenziswa okubanzi. Empilweni yansuku zonke, imikhiqizo eminingi ayihlukaniseki nenqubo yokukhiqiza. Ngemuva kwalokho, ezimbonini ezahlukene, uyini umphumela we-hydroxypropyl methylcellulose, ngizokuchazela yona, ukuze ukwazi ukuvimbela ukusetshenziswa kabi kwayo ngenkathi uthola ulwazi.
Okokuqala, embonini yokwakha, ingabhekwa njenge-retarder kanye ne-ejenti yokugcina amanzi. Udaka lwe-mortar luyampompa, ngakho-ke lonke udaka olomile esilusebenzisayo luneqhaza lalo. Ngaphezu kwalokho, ezintweni zokwakha ezifana ne-gypsum eluhlaza, i-plaster, kanye ne-mud powder, lungasetshenziswa njenge-binder, olungagcini nje ngokwandisa isikhathi sokusebenza, kodwa futhi lwenza upende uthambeke kalula. Kuma-marble, amathayili e-ceramic anamathelayo, imihlobiso yepulasitiki ehlanganisiwe yama-molecule, lungasetshenziswa njengesithuthukisi sokunamathela, njll. Kungashiwo ukuthi i-hydroxypropyl methyl cellulose idume kakhulu ngokuguquguquka kwayo ezintweni zokwakha.
Kweminye imboni, njengokukhiqiza i-porcelain kanye nobumba, ingasetshenziswa njengesinamathelisi sokwenza imikhiqizo ye-porcelain kanye nobumba; embonini ye-lacquer kanye nokuphrinta kweyinki, ingasetshenziswa njengempuphu ekhululekile, isithambisi, isiqinisi, futhi ngisho ngoba ingahlanganiswa ne-organic Solvent noma ukuxubana kwamanzi kahle, futhi ingasetshenziswa njengesisusi sopende ekwenziweni kwamapulasitiki ahlanganisiwe e-molecule, kanye nezithambisa, izinto zokukhulula isikhunta, izinto zokugcoba, njll.; ekwenziweni kwe-polyvinyl chloride, ibhekwa njengempuphu ekhululekile.
Imikhiqizo eyenziwe nge-hydroxypropyl methylcellulose isetshenziswa kabanzi ekuvuseleleni izithelo nemifino, imithi, izikhumba zezilwane kanye nezimboni zezindwangu. Iphephile futhi ayinabo ubuthi, ayicasuli kakhulu ulwelwesi lwamafinyila kanye nezikhumba zomzimba womuntu, futhi ingasetshenziswa njengesithako sokudla. Kodwa-ke, esimweni sangempela salolu daba, uthuli lwayo lungabangela ukungcola komoya, futhi akusizi ekugcinweni 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 phakathi nesikhathi lapho i-gypsum isibekwe ngokuphelele. Le mfanelo ekhethekile ibizwa ngokuthi ukugcinwa kwamanzi futhi ilingana ngqo ne-viscosity yesisombululo se-hydroxypropyl methylcellulose esisetshenziselwa ukwakha ku-plaster. Uma i-viscosity yesisombululo iphakeme, kulapho ulwazi lokugcinwa kwamanzi luphakama khona.
Ukulwa nokuwa
Udaka olunezakhiwo ezikhethekile zokulwa nokugoba lungasetshenziswa ngendwangu ejiyile ngaphandle kokugoba, okusho ukuthi udaka ngokwalo alushintshi ubulili balo, ngaphandle kwalokho luzoshelela phansi lapho ukwakhiwa kuqala.
Yehlisa ukujiya futhi wenze kube lula ukwakhiwa
Ngemva kokwengeza imikhiqizo ehlukahlukene ye-hydroxypropyl methylcellulose yokwakha ethile, kungakhiqizwa i-plaster eluhlaza ye-gypsum enesimo esithambile esithambile. Uma kubhekwa kufanele futhi kusetshenziswa izinga eliphansi le-hydroxypropyl methylcellulose yokwakha ethile, izinga le-viscosity liyancishiswa futhi ukwakhiwa kuba lula. Kodwa-ke, ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose yokwakha ene-viscosity ephansi kubuthakathaka kakhulu, futhi kuyadingeka ukwandisa inani lokwengeza.
Izinga lokuhambisana kwepulasitiki
Ukuze uthole inani elinqunyiwe lodaka olomile, kungcono kakhulu ukukhiqiza usayizi wodaka olumanzi kakhulu, okungatholakala ngokufaka amanzi amancane namabhamuza. Kodwa-ke, uma inani lamanzi namabhamuza lide kakhulu, amandla ayancishiswa.
Isikhathi sokuthunyelwe: Ephreli-26-2024