enye. Umahluko phakathi kokungcoliswai-hydroxypropyl methylcellulose (HPMC)kunye ne-hydroxypropyl methylcellulose ecocekileyo (HPMC)
1. Inkangeleko: I-hydroxypropyl methylcellulose ecocekileyo i-HPMC ibukeka ithambile kwaye inobunzima obuphantsi, ukusuka kwi-0.3-0.4g/ml; i-hydroxypropyl methylcellulose exutyiweyo i-HPMC inobumanzi obungcono kwaye ivakala inzima, kwaye kukho umahluko omkhulu kwinkangeleko kwimveliso yokwenyani.
2. Imeko: Umgubo we-hydroxypropyl methylcellulose we-HPMC ococekileyo une-fibrous phantsi kwe-microscope okanye iglasi yokukhulisa; ngelixa i-hydroxypropyl methylcellulose exutyiweyo ye-HPMC inokubonwa njenge-granular solids okanye iikristale phantsi kwe-microscope okanye iglasi yokukhulisa.
3. Ivumba: I-hydroxypropyl methylcellulose ecocekileyo i-HPMC ayinakunuka ivumba le-ammonia, istatshi kunye notywala; i-hydroxypropyl methylcellulose exutyiweyo i-HPMC inokunuka zonke iintlobo zevumba, nokuba ayinancasa, iya kuvakala inzima.
4. Isisombululo samanzi: isisombululo samanzi se-hydroxypropyl methylcellulose se-HPMC sicacile, sihamba ngokukhanya okuphezulu, izinga lokugcina amanzi ≥ 97%; isisombululo samanzi se-hydroxypropyl methylcellulose se-HPMC esixutyiweyo sinamafu, kwaye izinga lokugcina amanzi kunzima ukufikelela kwi-80%.
Okwesibini, ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose HPMC, kwahlula iingenelo kunye neengxaki:
Ukugcinwa kwamanzi kwe-methyl cellulose ether phantsi kweemeko zobushushu obuphezulu luphawu olubalulekileyo lokwahlula umgangatho we-methyl cellulose ether. Izinto ezifana nobushushu bomoya, ubushushu kunye nesantya soxinzelelo lomoya ziya kuchaphazela izinga lokuguquguquka kwamanzi kwi-samente mortar kunye neemveliso ezisekwe kwi-gypsum. Ke ngoko, ngamaxesha ahlukeneyo onyaka, kukho umahluko othile kwisiphumo sokugcina amanzi kwiimveliso ezinomlinganiselo ofanayo we-HPMC eyongeziweyo. Kwisakhiwo esithile, isiphumo sokugcina amanzi se-slurry sinokulungiswa ngokunyusa okanye ukunciphisa inani le-HPMC eyongeziweyo. Iimveliso ze-HPMC ezigqwesileyo ze-hydroxypropyl methylcellulose zinokusombulula ngempumelelo ingxaki yokugcina amanzi phantsi kobushushu obuphezulu.
I-methylcellulose ekumgangatho ophezulu ingasasazwa ngokulinganayo nangokufanelekileyo kwi-samente mortar kunye neemveliso ezisekwe kwi-gypsum, kwaye igoqe zonke iinxalenye eziqinileyo, kwaye yenze ifilimu yokumanzisa, umswakama kwisiseko ukhutshwa kancinci kancinci ixesha elide, kwaye i-inorganic. Impendulo yokufunxa amanzi kwezinto ezifakwe kwi-gel iqinisekisa amandla okubopha kunye namandla okucinezela kwezinto. I-hydroxypropyl methylcellulose HPMC ekumgangatho ophezulu, ukufana kwayo kulungile kakhulu, amaqela ayo e-methoxy kunye ne-hydroxypropoxy asasazwa ngokulinganayo kwi-cellulose molecular chain, inokunyusa i-oxygen kwi-hydroxyl kunye ne-ether bonds. Amandla ee-athomu okunxulumana namanzi ukwenza ii-hydrogen bonds aguqula amanzi akhululekileyo abe ngamanzi abotshiweyo, ngaloo ndlela elawula ngempumelelo ukufuma kwamanzi okubangelwa yimozulu ephezulu yobushushu kwaye afezekise ukugcinwa kwamanzi okuphezulu.
Ngoko ke, kulwakhiwo lwasehlotyeni olushushu kakhulu, ukuze kufezekiswe isiphumo sokugcina amanzi, kuyimfuneko ukongeza iimveliso ze-HPMC ezikumgangatho ophezulu ngobuninzi obaneleyo ngokwefomula, kungenjalo, kuya kubakho ukufuma okwaneleyo, amandla anciphileyo, ukuqhekeka, ukugoba kunye nokuchitheka okubangelwa kukoma kakhulu. kodwa kwanokwandisa ubunzima bokwakha babasebenzi. Njengoko ubushushu busiya buhla, ubungakanani bamanzi ongezelelweyo e-HPMC bunokuncipha kancinci kancinci, kwaye isiphumo esifanayo sokugcina amanzi sinokufezekiswa.
3. Ukunyibilika kwe-hydroxypropyl methylcellulose HPMC
Kwishishini lokwakha, i-hydroxypropyl methylcellulose HPMC idla ngokufakwa emanzini angathathi hlangothi, kwaye imveliso ye-HPMC iyanyibilika yodwa ukuze kugwetywe izinga lokunyibilika. Emva kokufakwa emanzini angathathi hlangothi yodwa, imveliso ehlangana ngokukhawuleza ngaphandle kokusasazeka yimveliso ngaphandle kokulungiswa komphezulu; emva kokufakwa emanzini angathathi hlangothi yodwa, imveliso enokusasaza ingahlangani yimveliso enokulungiswa komphezulu. Xa i-hydroxypropyl methylcellulose HPMC engalungiswanga umphezulu inyibilika yodwa, isuntswana layo elinye liyanyibilika ngokukhawuleza kwaye lenze ifilimu ngokukhawuleza, nto leyo ebangela ukuba amanzi angaphindi angene kwamanye amasuntswana, nto leyo ebangela ukuhlangana kunye nokuhlangana, okubizwa ngokuba kukunyibilika kancinci kwimveliso yemarike.
Iinxalenye zemveliso ze-HPMC ezicociweyo phezu komhlaba, emanzini angathathi cala, iinxalenye ngazinye zinokusasazwa ngaphandle kokuhlanganiswa, kodwa i-viscosity yemveliso ayizukusasazeka ngoko nangoko. Emva kokuntywila ixesha elithile, ulwakhiwo lweekhemikhali lonyango lomphezulu luyatshatyalaliswa, kwaye amanzi anganyibilikisa iinxalenye ze-HPMC. Ngeli xesha, iinxalenye zemveliso zisasazeke ngokupheleleyo kwaye zifunxwe ngamanzi aneleyo, ngoko ke imveliso ayizukudityaniswa okanye ihlanganiswe emva kokunyibilika. Isantya sokusasazeka kunye nesantya sokunyibilika sixhomekeke kwinqanaba lonyango lomphezulu. Ukuba unyango lomphezulu luncinci, isantya sokusasazeka sicotha kwaye isantya sokunamathela sikhawuleza; ngelixa imveliso enonyango lomphezulu onzulu inesantya sokusasazeka esikhawulezayo kunye nesantya sokunamathela esicothayo. Ukuba ufuna ukwenza olu luhlu lweemveliso lunyibilike ngokukhawuleza kule meko, ungalahla inani elincinci lezinto ze-alkaline xa zinyibilikisiwe zodwa. Imarike yangoku idla ngokubizwa ngokuba ziimveliso ezikhawulezileyo. Iimpawu zeemveliso ze-HPMC ezicociweyo phezu komhlaba zezi: kwisisombululo samanzi, iinxalenye zinokusasazeka zodwa, zinokunyibilika ngokukhawuleza kwimeko ye-alkaline, kwaye zinyibilike kancinci kwimeko ye-alkaline kunye ne-acidic.
Iimpawu ze-hydroxypropyl methylcellulose HPMC ezinganyangwanga zezi: isuntswana elinye linyibilika ngokukhawuleza kakhulu kwiimeko ze-acidic, alkaline, kunye ne-neutral, kodwa alinakusasazwa phakathi kwamasuntswana kulwelo, nto leyo ebangela ukuhlangana kunye nokuhlangana. Xa isebenza ngokwenene, emva kokusasazeka ngokwasemzimbeni kolu luhlu lweemveliso kunye namasuntswana aqinileyo afana nomgubo webhulabha, isamente, isanti, njl.njl., izinga lokunyibilika likhawuleza kakhulu, kwaye akukho kuhlangana okanye ukuhlangana. Xa kufuneka kunyibilikiswe iimveliso ze-HPMC ngokwahlukeneyo, olu luhlu lweemveliso kufuneka lusetyenziswe ngononophelo, njengoko luya kuhlangana kwaye lubambe kunye. Ukuba kuyimfuneko ukunyibilikisa imveliso ye-hydroxypropyl methylcellulose HPMC engaphathwanga ngaphezulu, kufuneka isasazwe ngokulinganayo ngamanzi ashushu angama-95°C, ize ipholiswe ukuze inyibilike.
Kwimveliso yokwenyani, olu luhlu lweemveliso ludla ngokunyibilika emva kokuba lusasazwe nezinye izinto eziqinileyo phantsi kweemeko ze-alkaline, kwaye izinga lokunyibilika kwalo alifani nelo leemveliso ezinganyangwanga. Lukwafanelekile ukusetyenziswa kwiimveliso ezinyibilikisiweyo zodwa, ngaphandle kokugawulwa okanye ukuqhekeka. Imodeli ethile yemveliso inokukhethwa ngokwezinga lokunyibilika elifunekayo kulwakhiwo.
Ngexesha lenkqubo yokwakha, nokuba yi-samente mortar okanye i-gypsum-based slurry, uninzi lwazo ziinkqubo ze-alkaline, kwaye ubungakanani be-HPMC eyongeziweyo buncinci kakhulu, obunokusasazwa ngokulinganayo phakathi kwezi ngceba. Xa kugalelwa amanzi,I-HPMCiya kunyibilika ngokukhawuleza.
Ixesha leposi: Epreli-26-2024