I-Hydroxypropyl methyl cellulose HPMC yi-non-ionic cellulose ether eyenziwe nge-cellulose yendalo yepolymer ngokusebenzisa uthotho lweenkqubo zeekhemikhali. Ziyimpuphu emhlophe engenavumba, engenancasa kwaye engenatyhefu evuvukala ibe yisisombululo se-colloidal esicacileyo okanye esirhabaxa emanzini abandayo. Ineempawu zokutyeba, ukubopha, ukusasazwa, i-emulsification, ukwakheka kwefilimu, ukumiswa, ukufunxwa, i-gelation, umsebenzi womphezulu, ukugcinwa komswakama kunye ne-colloid ekhuselayo. I-Hydroxypropyl methylcellulose ingasetyenziswa kwizixhobo zokwakha, kushishino lokugquma, kwi-resin yokwenziwa, kushishino lwe-ceramic, kumayeza, ekutyeni, kwilaphu, kwezolimo, kushishino lweekhemikhali zemihla ngemihla nakwamanye amashishini.
Umsebenzi kunye nomgaqo wokugcina amanzi: i-cellulose ether HPMC ikakhulu idlala indima yokugcina amanzi kunye nokuqina kwi-samente mortar kunye ne-gypsum-based slurry, enokuphucula ngempumelelo amandla okubopha kunye nokumelana nokuwa kwe-slurry. Izinto ezifana nobushushu bomoya, ubushushu kunye nesantya soxinzelelo lomoya ziya kuchaphazela izinga lokuguquguquka kwamanzi kwi-samente mortar kunye neemveliso ezisekelwe kwi-gypsum. Ke ngoko, ngamaxesha ahlukeneyo onyaka, kukho umahluko othile kwisiphumo sokugcina amanzi senani elifanayo leemveliso ze-HPMC. Kulwakhiwo oluthile, isiphumo sokugcina amanzi kwi-slurry sinokulungiswa ngokunyusa okanye ukunciphisa inani le-HPMC eyongeziweyo.
Ukugcinwa kwamanzi kwe-methyl cellulose ether phantsi kweemeko zobushushu obuphezulu luphawu olubalulekileyo lokwahlula umgangatho we-methyl cellulose ether. Iimveliso ezibalaseleyo zochungechunge lwe-HPMC zinokusombulula ngempumelelo ingxaki yokugcina amanzi kubushushu obuphezulu. Ngamaxesha obushushu obuphezulu, ingakumbi kwiindawo ezishushu nezomileyo kunye nolwakhiwo oluncinci kwicala elinelanga, i-HPMC esemgangathweni ophezulu iyafuneka ukuphucula ukugcinwa kwamanzi kwe-slurry.
I-HPMC esemgangathweni ophezulu inobunye obuhle kakhulu. Amaqela ayo e-methoxy kunye ne-hydroxypropoxy asasazwa ngokulinganayo kwi-cellulose molecular chain, nto leyo enokuphucula amandla ee-athomu ze-oxygen kwi-hydroxyl kunye ne-ether bonds ukuba zidibane namanzi ukuze zenze ii-hydrogen bonds. , Ukuze amanzi akhululekileyo abe ngamanzi abotshelelweyo, ngaloo ndlela alawule ngempumelelo ukufuma kwamanzi okubangelwa yimozulu eshushu kakhulu, kwaye afikelele ekugcinweni kwamanzi okuphezulu.
I-HPMC ye-cellulose ekumgangatho ophezulu ingasasazwa ngokulinganayo nangokufanelekileyo kwi-samente mortar kunye neemveliso ezisekwe kwi-gypsum, kwaye igoqe zonke iinxalenye eziqinileyo, kwaye yenze umaleko wefilimu yokumanzisa. Amanzi akwisiseko akhululwa kancinci kancinci kwixesha elide. Izinto ezixineneyo zifumana impendulo yokufunxa amanzi, ukuqinisekisa amandla okubopha kunye namandla okucinezela kwezinto. Ke ngoko, kulwakhiwo lwasehlotyeni olushushu kakhulu, ukuze kufezekiswe isiphumo sokugcina amanzi, iimveliso ze-HPMC ezikumgangatho ophezulu kufuneka zongezwe ngobuninzi obaneleyo ngokwefomula, kungenjalo, ukufunxa amanzi okwaneleyo, amandla anciphileyo, ukuqhekeka, ukugoba kunye nokuwa kuya kwenzeka ngenxa yokomisa kakhulu. Iingxaki, kodwa kwanda nobunzima babasebenzi bokwakha. Njengoko ubushushu buncipha, ubungakanani be-HPMC eyongeziweyo bunokuncipha kancinci kancinci, kwaye isiphumo esifanayo sokugcina amanzi sinokufezekiswa.
Ukugcinwa kwamanzi kwe-HPMC kuchatshazelwa zezi zinto zilandelayo:
1. Ukulingana kwe-cellulose ether HPMC
Kwi-HPMC esabela ngokufanayo, amaqela e-methoxy kunye ne-hydroxypropoxy asasazwa ngokulinganayo, kwaye izinga lokugcina amanzi liphezulu.
2. Ubushushu bejeli eshushu ye-cellulose ether HPMC
Ubushushu bejeli yobushushu buphezulu, izinga lokugcina amanzi liphezulu; ngokuchaseneyo, izinga lokugcina amanzi liphantsi.
3. Ukuqina kwe-cellulose ether HPMC
Xa i-viscosity ye-HPMC isanda, izinga lokugcina amanzi nalo liyakhula; xa i-viscosity ifikelela kwinqanaba elithile, ukunyuka kwenqanaba lokugcina amanzi kudla ngokuba tyaba.
4. Ukongezwa kwe-cellulose ether HPMC
Okukhona inani elikhulu le-cellulose ether HPMC yongezwa, kokukhona izinga lokugcina amanzi liphezulu kwaye kokukhona isiphumo sokugcina amanzi singcono. Kuluhlu lokongeza lwe-0.25-0.6%, izinga lokugcina amanzi liyanda ngokukhawuleza ngokonyuka kwenani lokongeza; xa inani lokongeza lisanda ngakumbi, umkhwa okhulayo wezinga lokugcina amanzi uyehla.
Ixesha lokuthumela: Disemba-16-2021