HPMC (hydroxypropyl methylcellulose) yakakosha kemikari yekuwedzera iyo inoita basa rakakosha mune zvakawanda zvekuvaka, kunyanya mumatairi anonamira. HPMC ine mabasa akasiyana-siyana, kusanganisira kukora, kuchengetedza mvura, uye kuvandudza rheology.
Kuvhura nguva yekunamatira mataira
Nguva yekuvhurika inoreva hwindo renguva iyo tile yekunamatira inogona kuramba yakanamatira mushure mekunge yaiswa kune substrate. Muchigadziro chaicho chekuvaka, mataira anonamira anofanirwa kuve nenguva yakakodzera yekuvhurika kuitira kuti vashandi vekuvaka vawane nguva yakakwana yekupedzisa kuisa mataira. Yakanyanya kupfupika yakavhurika nguva ichaita kuti iyo inonamira irasikirwe ne viscosity yayo, nekudaro ichikanganisa iyo yekubatanidza mhedzisiro yematiles uye kunyange kukonzera rework. Kurebesa nguva yakavhurika inogona kukanganisa kushanda kwekuvaka uye yekupedzisira yekubatanidza simba. Naizvozvo, kudzora zvine musoro kwenguva yakavhurika yekunamatira mataira kwakakosha pakuvandudza kunaka kwekuvaka uye kugona
Basic zvimiro zveHPMC
HPMC i polymer inonyungudika nemvura inotorwa kubva muselulosi. Iyo ine yakanakisa thickening, film-forming uye mvura-yekuchengetedza zvivakwa. Mumataira anonamira, HPMC inonyanya kukanganisa nguva yakavhurika kuburikidza neanotevera maitiro:
Kuchengetedzwa kwemvura: HPMC inogona kunyatso tora uye kuchengetedza mvura, nekudaro ichidzivirira mvura iri mune inonamira kubva pakubuda nekukurumidza. Ichi ndicho chimwe chezvinhu zvakakosha zvekuvandudza nguva yakavhurika. Munguva yekuvaka, kubuda kwemvura kuchaita kuti nzvimbo yekunamatira iome nguva isati yakwana, nekudaro ichipfupisa nguva yakazaruka. HPMC inoumba chipingamupinyi chekunyorova kuti inonoke kurasikirwa kwemvura uye ive nechokwadi chekuti tile inonamira inochengetedza yakakodzera humidity mamiriro kwenguva yakareba.
Kukora mhedzisiro: Iyo yakakwira viscosity mhinduro yakaumbwa mushure mekunge HPMC yanyungudika mumvura inogona kuwedzera kuenderana kweanonamira uye kudzivirira iyo inonamira kuti isayerera nekukasira kana kupinda mukati meiyo substrate panguva yekushandisa. Nekugadzirisa zvakanaka huwandu hweHPMC yakawedzerwa, iyo rheological zvimiro zveanonamatira zvinogona kugadziridzwa, nekudaro ichiwedzera nguva yekugara kwayo pane substrate pamusoro uye nekudaro kuwedzera yakavhurika nguva.
Firimu-yekugadzira chivakwa: HPMC ine yakanaka yekugadzira firimu kugona uye inoumba firimu rinochinjika pamusoro peanonamira. Iyi firimu haigone chete kuderedza kubuda kwemvura, asiwo kudzivirira kukanganisa kwekunze kwekunze kwakafanana nekumhanya kwemhepo uye tembiricha pane inonamatira, nekudaro ichiwedzera kuwedzera nguva yakazaruka. Iyo firimu-inogadzira mhedzisiro yeHPMC inonyanya kukosha mukupisa kwepamusoro kana kuderera kwehunyoro nharaunda, nekuti mvura inoputika nekukurumidza pasi pemamiriro ezvinhu ezvakatipoteredza uye nguva yakavhurika yekunamatira inogona kupfupikiswa.
Kufurira kweiyo molecular chimiro cheHPMC pane yakavhurika nguva
Iyo molecular chimiro uye dhigirii rekutsiva (kureva, dhigirii rehydroxypropyl uye methyl substitution) yeHPMC zvinhu zvakakosha zvinokanganisa kushanda kwayo mumatairi anonamira. Kazhinji, HPMC ine dhigirii repamusoro rekutsiva ine simba rekuchengetedza mvura uye iri nani kukora mhedzisiro, iyo inobatsira kuwedzera zvakanyanya kuvhurika nguva yekunamira. Mukuwedzera, iyo molecular weight yeHPMC inokanganisawo kunyungudika kwayo mumvura uye viscosity yemhinduro, iyo inokanganisa zvisina kunanga nguva yakazaruka.
Mumashandisirwo anoshanda, vagadziri vezvinhu zvekuvaka vanogona kusarudza HPMC yezvakasiyana zvirevo zvinoenderana neyakasiyana zvinodiwa zvekuvaka kuti uwane kudzora chaiko kweiyo yakavhurika nguva yekunamatira mataira. Semuenzaniso, munzvimbo inopisa uye yakaoma, kusarudza HPMC nehupamhi hwekutsiviwa uye huremu hwepamusoro hwema molecular hunogona kuchengetedza zviri nani kunyorova kwekunamatira, nekudaro kuwedzera nguva yakazaruka; ichiri munzvimbo ine hunyoro uye inotonhora, HPMC ine yakaderera dhigirii yekutsiva inogona kusarudzwa kudzivirira iyo yakavhurika nguva kuve yakarebesa uye kukanganisa kugona kwekuvaka.
Kuita kweHPMC pasi pemamiriro akasiyana ezvakatipoteredza
Mamiriro ekuvaka akasiyana ane akasiyana ekuita zvinodiwa zvekunamira mataira. Iko kushandiswa kweHPMC kunogona kubatsira mataira anonamira kuchengetedza yakagadzikana yakavhurika nguva pasi peakasiyana emamiriro ekunze. Munzvimbo dzinopisa, dzakaoma uye dzine mhepo, mvura inoputika nekukurumidza, zvichiita kuti nzvimbo yekunamatira irasike viscosity nekukurumidza. Kuchengetedza kwemvura kweHPMC kunokwanisa kunonoka zvakanyanya kuita uku, kuve nechokwadi chekuti matile anonamira anoramba ari munzvimbo yakakodzera yekuvaka kwenguva yakareba.
Pasi pe tembiricha yakaderera kana yakakwira humidity mamiriro, kunyangwe mvura ichinyungudika zvishoma nezvishoma, kukora uye firimu-kuumba mhedzisiro yeHPMC inogona kuramba ichibatsira kudzora rheology yekunamatira uye kudzivirira iyo inonamira kuti isapararire nekukurumidza pane substrate pamusoro, zvichikonzera kusaenzana kubatana. Nekugadzirisa huwandu uye rudzi rweHPMC yakawedzerwa, iyo yakavhurika nguva yekunamatira mataira inogona kunyatsogadziriswa pasi pezvakasiyana mamiriro ezvakatipoteredza.
Kukanganisa kwekushandiswa kweHPMC pakuvaka
Nekuwedzera HPMC, iyo yakavhurika nguva yekunamatira mataira inogona kuwedzerwa, izvo zvinounza mabhenefiti akawanda kune vashandi vekuvaka. Chekutanga, vashandi vekuvaka vane nguva yakawanda yekugadziridza uye kuisa mataira, vachideredza kumanikidzwa kwekuvaka kunokonzerwa nenguva pfupi yekuvhura. Kechipiri, iyo firimu-inogadzira uye inochengetedza mvura mhedzisiro yeHPMC zvakare inoderedza kukanganisa kwekuvaka kunokonzerwa nekuoma kwepasi, senge tile warping kana gollowing. Uye zvakare, iyo thickening maitiro eHPMC zvakare inovandudza iyo yakamira yekunamatira kugona kweanonamira, kudzivirira kutsvedza kwematairi pamadziro akatwasuka.
HPMC inonyatso gadziridza yakavhurika nguva yekunamira mataira kuburikidza nekuchengetedza kwayo kwakanakisa kwemvura, kukora uye firimu-kugadzira zvinhu. Izvi hazvisi kungovandudza kushanduka uye kushanda zvakanaka kwekuvaka, asiwo kunovimbisa hutano hwekupedzisira hwekubatana. Nekuenderera mberi kwekuvandudza tekinoroji yekuvaka, HPMC, sechinhu chinowedzera chinowedzera, ichava netarisiro yakakura yekushandisa mune zvinonamira mataira. Mune ramangwana, nekuwedzera optimize chimiro chemolecular uye fomula yekushandisa yeHPMC, mashandiro ematairi anonamira anotarisirwa kuwedzera kuvandudzwa.
Nguva yekutumira: Sep-26-2024