Isimiso sokugcina amanzi se-hydroxypropyl methylcellulose (HPMC)

I-Hydroxypropyl methyl cellulose HPMC iyi-non-ionic cellulose ether eyenziwe nge-cellulose yemvelo ye-polymer ngokusebenzisa uchungechunge lwezinqubo zamakhemikhali. Ziyimpuphu emhlophe engenaphunga, engenambitheki futhi engenabuthi evuvukala ibe yisisombululo se-colloidal esicacile noma esithambile emanzini abandayo. Inezici zokuqina, ukubopha, ukuhlakazeka, i-emulsification, ukwakheka kwefilimu, ukumiswa, ukumuncwa, i-gelation, umsebenzi wobuso, ukugcinwa komswakama kanye ne-colloid evikelayo. I-Hydroxypropyl methylcellulose ingasetshenziswa ezintweni zokwakha, embonini yokumboza, i-resin yokwenziwa, imboni ye-ceramic, imithi, ukudla, indwangu, ezolimo, imboni yamakhemikhali yansuku zonke kanye neminye imboni.

Umsebenzi kanye nesimiso sokugcina amanzi: i-cellulose ether HPMC idlala indima yokugcina amanzi kanye nokuqina kodaka lukasimende kanye nodaka olusekelwe ku-gypsum, okungathuthukisa ngempumelelo amandla okubopha kanye nokumelana nokuwa kodaka. Izici ezifana nokushisa komoya, izinga lokushisa kanye nesivinini sokucindezela komoya kuzothinta izinga lokuguquguquka kwamanzi kudaka lukasimende kanye nemikhiqizo esekelwe ku-gypsum. Ngakho-ke, ezinkathini ezahlukene, kunomehluko othile emphumeleni wokugcina amanzi wenani elifanayo lemikhiqizo ye-HPMC. Ekwakhiweni okuthile, umphumela wokugcina amanzi wedaka ungalungiswa ngokwandisa noma ukunciphisa inani le-HPMC elingeziwe.

Ukugcinwa kwamanzi kwe-methyl cellulose ether ngaphansi kwezimo zokushisa okuphezulu kuyinkomba ebalulekile yokuhlukanisa ikhwalithi ye-methyl cellulose ether. Imikhiqizo emihle kakhulu yochungechunge lwe-HPMC ingaxazulula ngempumelelo inkinga yokugcinwa kwamanzi emazingeni okushisa aphezulu. Ezinkathini zokushisa okuphezulu, ikakhulukazi ezindaweni ezishisayo nezomile kanye nokwakhiwa okunezingqimba ezincane ohlangothini olunelanga, i-HPMC esezingeni eliphezulu iyadingeka ukuthuthukisa ukugcinwa kwamanzi kwe-slurry.

I-HPMC esezingeni eliphezulu inokufana okuhle kakhulu. Amaqembu ayo e-methoxy kanye ne-hydroxypropoxy asatshalaliswa ngokulinganayo ku-cellulose molecular chain, okungathuthukisa ikhono lama-athomu e-oxygen kuma-hydroxyl kanye ne-ether bonds ukuhlangana namanzi ukwakha ama-hydrogen bonds. , Ukuze amanzi akhululekile abe ngamanzi aboshwe, ngaleyo ndlela alawule ngempumelelo ukuhwamuka kwamanzi okubangelwa yisimo sezulu esishisa kakhulu, futhi afinyelele ukugcinwa kwamanzi okuphezulu.

I-HPMC ye-cellulose esezingeni eliphezulu ingasakazwa ngokulinganayo nangokuphumelelayo ku-cement mortar kanye nemikhiqizo esekelwe ku-gypsum, bese igoqa zonke izinhlayiya eziqinile, bese yakha ungqimba lwefilimu yokumanzisa. Amanzi angaphansi akhishwa kancane kancane isikhathi eside. Izinto ezihlanganisiwe zithola ukusabela komswakama, ukuze kuqinisekiswe amandla okubopha kanye namandla okucindezela kwezinto. Ngakho-ke, ekwakhiweni kwehlobo lokushisa eliphezulu, ukuze kufezwe umphumela wokugcinwa kwamanzi, imikhiqizo ye-HPMC esezingeni eliphezulu kumele ifakwe ngobuningi obanele ngokwefomula, ngaphandle kwalokho, umswakama onganele, amandla ancishisiwe, ukuqhekeka, ukugoba kanye nokuwa kuzokwenzeka ngenxa yokomisa ngokweqile. Izinkinga, kodwa futhi zandisa ubunzima bezisebenzi zokwakha. Njengoba izinga lokushisa lehla, inani le-HPMC elingeziwe lingancishiswa kancane kancane, futhi umphumela ofanayo wokugcinwa kwamanzi ungafinyelelwa.

Ukugcinwa kwamanzi kwe-HPMC kuthintwa yizici ezilandelayo:
1. Ukufana kwe-cellulose ether HPMC
Ku-HPMC esabela ngendlela efanayo, amaqembu e-methoxy kanye ne-hydroxypropoxy asatshalaliswa ngokulinganayo, futhi izinga lokugcina amanzi liphezulu.

2. Ukushisa kwejeli elishisayo le-cellulose ether HPMC
Izinga lokushisa lejeli lokushisa liphezulu, izinga lokugcina amanzi liphezulu; ngokuphambene nalokho, izinga lokugcina amanzi liphansi.

3. Ukuqina kwe-cellulose ether HPMC
Uma i-viscosity ye-HPMC ikhula, izinga lokugcina amanzi nalo liyakhula; lapho i-viscosity ifinyelela ezingeni elithile, ukwanda kwesilinganiso sokugcina amanzi kuvame ukuba yisicaba.

4. Ukwengezwa kwe-cellulose ether HPMC
Uma inani le-cellulose ether HPMC likhudlwana, izinga lokugcina amanzi liyanda futhi umphumela wokugcina amanzi uba ngcono. Esibangeni sokwengeza esingu-0.25-0.6%, izinga lokugcina amanzi likhula ngokushesha ngokwanda kwenani lokwengeza; lapho inani lokwengeza likhula ngokwengeziwe, umkhuba okhulayo wezinga lokugcina amanzi uyehla.