Kuchengetwa kwemvura chinhu chakakosha kune akawanda maindasitiri anoshandisa hydrophilic zvinhu zvakaita se cellulose ethers.Hydroxypropylmethylcellulose (HPMC) imwe ye cellulose ethers ine yakakwirira yekuchengetedza mvura.HPMC isemi-synthetic polymer inotorwa kubva ku cellulose uye inowanzoshandiswa mumhando dzakasiyana dzekushandisa mukuvaka, mishonga uye chikafu maindasitiri.
HPMC inoshandiswa zvakanyanya seyakakora, stabilizer uye emulsifier mune zvakasiyana siyana zvigadzirwa zvechikafu senge ice cream, sosi uye madhirezi ekusimudzira magadzirirwo avo, kuwirirana uye hupenyu hwesherufu.HPMC inoshandiswawo mukugadzirwa kwemishonga muindasitiri yemishonga sebhainda, disintegrant uye firimu coating agent.Inoshandiswawo sechinhu chinochengetedza mvura muzvinhu zvekuvaka, kunyanya mu simende nedhaka.
Kuchengeta mvura chinhu chakakosha pakuvaka nekuti zvinobatsira kuti simende ichangobva kusanganiswa nedhaka zvisaoma.Kuomesa kunogona kukonzera shrinkage uye kuputika, zvichiita kuti zvive zvisina simba uye zvigadziro zvisina kugadzikana.HPMC inobatsira kuchengetedza zvirimo zvemvura musimende nedhaka nekutora mamorekuru emvura uye nekuaburitsa zvishoma nezvishoma nekufamba kwenguva, zvichibvumira zvinhu zvekuvaka kuti zvinyatsopora nekuoma.
Iyo yekuchengetedza mvura musimboti weHPMC unobva pane hydrophilicity yayo.Nekuda kwekuvapo kwemapoka ehydroxyl (-OH) muchimiro chayo chemolecular, HPMC ine hukama hwepamusoro hwemvura.Mapoka ehydroxyl anodyidzana nemamorekuru emvura kuti aumbe hydrogen bond, zvichikonzera kuumbwa kwegoko re hydration rakatenderedza cheni dzepolymer.Iyo hydrated shell inobvumira iyo polymer cheni kuti iwedzere, ichiwedzera huwandu hweHPMC.
Kuzvimba kweHPMC inzira ine simba inoenderana nezvinhu zvakasiyana senge degree rekutsiva (DS), particle size, tembiricha uye pH.Iyo dhigirii yekutsiva inoreva nhamba yeakatsiviwa hydroxyl mapoka paanhydroglucose unit mucheni ye cellulose.Iyo yakakwirira yeDS kukosha, iyo yakakwirira yehydrophilicity uye zvirinani kuchengetedza kwemvura kuita.Saizi yeHPMC inokanganisawo kuchengetwa kwemvura, sezvo zvidimbu zvidiki zvine nzvimbo yakakura yepasi pachiyero cheyuniti, zvichikonzera kunyura kwemvura.Tembiricha uye pH kukosha kunokanganisa dhigirii yekuzvimba nekuchengetedza mvura, uye tembiricha yepamusoro uye yakaderera pH kukosha inosimudzira kuzvimba uye kuchengetedza mvura zvivakwa zveHPMC.
Iyo nzira yekuchengetedza mvura yeHPMC inosanganisira maitiro maviri: kutora uye desorption.Munguva yekunyura, HPMC inotora mamorekuru emvura kubva kunharaunda yakatenderedza, ichigadzira hydration goko rakatenderedza polymer cheni.Iyo hydration shell inodzivirira macheni epolymer kubva pakudonha uye anoachengeta akaparadzaniswa, zvichitungamira mukuzvimba kweHPMC.Mamorekuru emvura akanyudzwa anoumba hydrogen zvisungo nemapoka ehydroxyl muHPMC, achivandudza mashandiro ekuchengetedza mvura.
Munguva ye desorption, HPMC inoburitsa zvishoma nezvishoma mamorekuru emvura, ichibvumira zvinhu zvekuvaka kuti zvirape nemazvo.Kusununguka kunononoka kwemamorekuru emvura kunovimbisa kuti simenti nedhaka zvinoramba zvakazara hydrated, zvichiita kuti chigadziko chigadzikane uye chinogara.Kusununguka kunononoka kwemamorekuru emvura kunopawo mvura inogara iripo kune simende nedhaka, inosimudzira nzira yekurapa uye kuwedzera simba nekugadzikana kwechigadzirwa chekupedzisira.
Muchidimbu, kuchengetwa kwemvura chinhu chakakosha kune akawanda maindasitiri anoshandisa hydrophilic zvinhu zvakaita se cellulose ethers.HPMC ndeimwe ye cellulose ethers ine yakakwirira yekuchengetedza mvura uye inoshandiswa zvakanyanya mukuvaka, mishonga uye maindasitiri ezvekudya.Iwo ekuchengetedza mvura zvimiro zveHPMC zvakavakirwa pa hydrophilicity yayo, iyo inoita kuti itore mamorekuru emvura kubva kunharaunda yakatenderedza, ichigadzira hydration goko rakatenderedza polymer cheni.Iyo hydrated shell inoita kuti HPMC iwedzere, uye kunonoka kuburitswa kwemamorekuru emvura kunovimbisa kuti chivakwa chinoramba chakazara hydrated, zvichikonzera kugadzikana uye kusimba chimiro.
Nguva yekutumira: Aug-24-2023