Te Hydroxypropyl methylcellulose (HPMC)He mea whakaranu ki te cellulose kore-ionic, wairewa-wai. He mā te āhua o te paura, he mea kirikiri rānei, he mea kore reka, kore kakara, kāore he paitini, he pumau te matū, ā, ka rewa ki te wai hei hanga i tētahi otinga maeneene, mārama, me te matotoru. Ko tētahi o ngā āhuatanga tino nui o te hydroxypropyl methylcellulose i roto i te whakamahinga ko te whakanui ake i te matotoru o te wai. Ko te pānga matotoru e whakawhirinaki ana ki te nui o te polymerization (DP) o te hua, te kukū o te cellulose ether i roto i te otinga wai, te tere kutikuti, me te pāmahana o te otinga. Me ētahi atu āhuatanga.
01
Momo wai o te otinga wai HPMC
I te nuinga o te wā, ka taea te whakaatu i te ahotea o te wai i roto i te rere kutikuti hei mahi a te tere kutikuti ƒ(γ) anake, mena kāore i te whakawhirinaki ki te wā. I runga i te āhua o ƒ(γ), ka taea te wehewehe i ngā wai ki ngā momo rerekē, arā: ngā wai Newtonian, ngā wai whakawhanui, ngā wai pseudoplastic me ngā wai kirihou Bingham.
E rua ngā wāhanga o ngā etera cellulose: ko tētahi he etera cellulose kore-ionic, ko tētahi he etera cellulose ionic. Mō te rheology o ēnei momo etera cellulose e rua, i whakahaerehia e SC Naik me ētahi atu tētahi rangahau whakatairite whānui me te pūnaha mō ngā otinga hydroxyethyl cellulose me te sodium carboxymethyl cellulose. I whakaatuhia e ngā hua he pseudoplastic ngā otinga etera cellulose kore-ionic me ngā otinga etera cellulose ionic. Ko ngā rere, arā, ko ngā rere kore-Newtonian, ka whakatata atu ki ngā wai Newtonian i ngā kukū iti rawa. He mea nui te pseudoplasticity o te otinga hydroxypropyl methylcellulose i roto i te tono. Hei tauira, ina whakamahia ki ngā paninga, nā ngā āhuatanga angiangi kutikuti o ngā otinga wai, ka heke te matotoru o te otinga me te pikinga o te tere kutikuti, e whai hua ana ki te horapa ōrite o ngā matūriki tae, ā, ka whakanuia hoki te rere o te paninga. He tino nui te pānga; i te wā e okioki ana, he nui te matotoru o te otinga, e ārai ana i te whakatakotoranga o ngā matūriki tae ki roto i te paninga.
02
Tikanga Whakamātautau Matotoru HPMC
Ko te matotoru kitea o te wairewa he tohu nui hei ine i te pānga matotoru o te hydroxypropyl methylcellulose. Ko ngā tikanga ine mō te matotoru kitea ko te tikanga matotoru capillary, te tikanga matotoru hurihuri me te tikanga matotoru pōro hinga.
ko: te matotoru kitea, mPa s; ko K te pūmau o te ine matotoru; ko d te kiato o te tauira otinga i te 20/20°C; ko t te wā e haere ai te otinga mā te wāhanga o runga o te ine matotoru ki te tohu o raro, s; ka inehia te wā e rere ai te hinu paerewa mā te ine matotoru.
Heoi, he uaua ake te tikanga ine mā te mita waikura capillary. Ko ngā waikura o te tiningā etera celluloseHe uaua ki te tātari mā te whakamahi i te mita waikura capillary nā te mea he iti noa iho ngā mea kore e rewa i roto i ēnei otinga, ā, ka kitea noa iho ina āraia te mita waikura capillary. Nō reira, ko te nuinga o ngā kaihanga e whakamahi ana i ngā mita waikura hurihuri hei whakahaere i te kounga o te hydroxypropyl methylcellulose. He mea noa te whakamahi i ngā mita waikura Brookfield i ngā whenua ke, ā, ko ngā mita waikura NDJ e whakamahia ana i Haina.
03
Ngā āhuatanga e pā ana ki te matotoru o te HPMC
3.1 Te whanaungatanga ki te nui o te whakahiatotanga
Ina kore e rerekē ētahi atu tawhā, ka rite te matotoru o te otinga hydroxypropyl methylcellulose ki te nui o te polymerization (DP) te taumaha ngota ngota, te roa rānei o te mekameka ngota ngota, ā, ka piki ake i te pikinga o te nui o te polymerization. Ka kitea ake tēnei pānga i roto i te take o te iti o te polymerization i te take o te teitei o te polymerization.
3.2 Te whanaungatanga i waenga i te matotoru me te kukū
Ka piki ake te matotoru o te hydroxypropyl methylcellulose i te pikinga o te kukū o te hua i roto i te wairewa. Ahakoa he iti noa te huringa kukū, ka nui te huringa o te matotoru. Mēnā ka rite te matotoru o te hydroxypropyl methylcellulose ki te matotoru o te wairewa, ka kitea nuitia te pānga o te huringa kukū o te wairewa ki te matotoru o te wairewa.
3.3 Te whanaungatanga i waenga i te matotoru me te tere kutikuti
Ko te āhuatanga o te wairewa wai Hydroxypropyl methylcellulose he angiangi kutikuti. Ka whakaritea te Hydroxypropyl methylcellulose o ngā momo matotoru ingoa rerekē ki roto i te wairewa wai 2%, ā, ka inehia tōna matotoru i ngā tere kutikuti rerekē. Ko ngā hua e whai ake nei. E ai ki te pikitia. I te tere kutikuti iti, kāore i tino rerekē te matotoru o te wairewa hydroxypropyl methylcellulose. I te pikinga ake o te tere kutikuti, ka tino heke te matotoru o te wairewa hydroxypropyl methylcellulose he nui ake te matotoru ingoa, engari kāore i tino heke te matotoru o te wairewa he iti te matotoru.
3.4 Te whanaungatanga i waenga i te matotoru me te pāmahana
He nui te pānga o te pāmahana ki te matotoru o te otinga hydroxypropyl methylcellulose. I te pikinga o te pāmahana, ka heke te matotoru o te otinga. E ai ki te pikitia, ka whakaritea ki roto i tētahi otinga wai me te kukū o te 2%, ā, ka inehia te huringa o te matotoru me te pikinga o te pāmahana.
3.5 Ētahi atu āhuatanga awe
Ka pāngia hoki te matotoru o te wairewa o te hydroxypropyl methylcellulose e ngā tāpiringa kei roto i te wairewa, te uara pH o te wairewa, me te pirau o ngā moroiti. I te nuinga o te wā, kia pai ake ai te mahi matotoru, kia whakaitihia rānei te utu whakamahi, me tāpiri ngā whakarerekētanga rheology, pērā i te uku, te uku whakarerekē, te paura polymer, te māngaro ether me te aliphatic copolymer, ki te wairewa o te hydroxypropyl methylcellulose, ā, ka taea hoki te tāpiri i ngā electrolytes pērā i te chloride, te bromide, te phosphate, te nitrate, me ētahi atu ki te wairewa. E kore e pā noa ēnei tāpiringa ki ngā āhuatanga matotoru o te wairewa, engari ka pā anō hoki ki ētahi atu āhuatanga tono o te hydroxypropyl methylcellulose pērā i te pupuri wai, te ātete totoro, me ētahi atu.
Kāore te waikawa me te kawakore e pāngia e te matotoru o te wairewa hydroxypropyl methylcellulose, ā, he pumau tonu i waenga i te 3 ki te 11. Ka taea e ia te tu atu ki tētahi nui o ngā waikawa ngoikore, pērā i te waikawa formic, te waikawa acetic, te waikawa phosphoric, te waikawa boric, te waikawa citric, me ētahi atu. Heoi, ka whakaitihia e te waikawa kukū te matotoru. Engari he iti noa te pānga o te houra kaustic, te pāhare pākawa waro, te wai raima, me ētahi atu ki a ia. Ki te whakatauritea ki ētahi atu cellulose ethers,hydroxypropyl methylcelluloseHe pai te pumau o te wairewa wai ki ngā huakita, ko te take matua he nui ngā rōpū hydrophobic o te hydroxypropyl methylcellulose me te nui o te whakakapinga me te aukati steric o ngā rōpū. Heoi, nā te mea kāore i te ōrite te tauhohenga whakakapinga, ka tino ngawari te pakaru o te waeine anhydroglucose kāore i whakakapia e ngā moroiti, ka hua ake te pakaru o ngā ngota cellulose ether me te haehae mekameka. Ko te mahi ko te heke o te matotoru o te wairewa wai. Mena me penapena te wairewa wai o te hydroxypropyl methylcellulose mō te wā roa, ka tūtohutia kia tāpirihia he iti noa o te kaihoko antifungal kia kore ai e tino rerekē te matotoru. I te wā e whiriwhiri ana i ngā kaihoko anti-fungal, ngā mea tiaki, ngā harore rānei, me aro koe ki te haumaru, me te whiriwhiri i ngā hua kāore e paitini ki te tinana tangata, he āhuatanga pumau, kāore hoki e kakara, pērā i ngā harore AMICAL a DOW Chem, ngā mea tiaki CANGUARD64, ngā kaihoko huakita FUELSAVER me ētahi atu hua. Ka taea e rātou te whai wāhi rite.
Wā tuku: 28 Paenga-whāwhā 2024