Hydroxypropylmethylcellulose (HPMC) i polymer inoshanda yakawanda inotorwa kubva kune yakasikwa cellulose. Inowanzoshandiswa mumaindasitiri akasiyana-siyana, kusanganisira mishonga, chikafu, kuvaka uye cosmetics. Kugadzirwa kweHPMC kunosanganisira zvakasiyana-siyana zvekushandisa uye maitiro akawanda-nhanho.
Cellulose:
Kwakabva: Iyo huru yakabikwa yeHPMC ndeye cellulose, yakaoma carbohydrate inowanikwa muchirimwa sero madziro. Iyo inonyanya kuzivikanwa sosi ye cellulose yekugadzirwa kweHPMC ndeyehuni pulp, asi mamwe masosi semakotoni linters anogona zvakare kushandiswa.
Kugadzirira: Cellulose inowanzogadziriswa kubvisa tsvina uye inogadziriswa kuva fomu yakakodzera kuti iwedzere kugadziriswa.
Base:
Type: Sodium hydroxide (NaOH) kana potassium hydroxide (KOH) inowanzo shandiswa sehwaro panguva yekutanga matanho ekugadzirwa kweHPMC.
Basa: Alkali inoshandiswa kurapa cellulose, zvichiita kuti iwedzere uye kuparadza chimiro chayo. Iyi nzira, inonzi alkalization, inogadzirira cellulose kune mamwe maitiro.
Alkali etherifying agent:
Hydroxypropylating agent: Propylene oxide inowanzoshandiswa kuunza mapoka ehydroxypropyl mumusana we cellulose. Iyi nhanho inopa kunyungudika uye zvimwe zvinodikanwa zvivakwa kune cellulose.
Methylating agents: Methyl chloride kana dimethyl sulfate inowanzoshandiswa kuunza methyl mapoka pane cellulose chimiro, nekudaro ichiwedzera hunhu hwayo hwese.
Methylating agent:
Methanol: Methanol inowanzoshandiswa se solvent uye reactant mu methylation maitiro. Inobatsira kuunza methyl mapoka mumaketani e cellulose.
Hydroxypropylating agent:
Propylene oxide: Ndiyo yakakosha zvinhu zvekuunza hydroxypropyl mapoka mu cellulose. Kuita pakati pepropylene oxide uye cellulose kunoitika pasi pemamiriro ekudzora.
catalyst:
Acid Catalyst: An acid catalyst, senge sulfuric acid, inoshandiswa kukurudzira etherification reaction. Vanobatsira kudzora maitiro ekuita uye zvigadzirwa zvechigadzirwa.
Solvent:
Mvura: Mvura inowanzoshandiswa sechinhu chinonyungudutsa pamatanho akasiyana-siyana ekugadzira. Izvo zvakakosha pakunyungudutsa reactants uye kusimudzira kuita pakati pe cellulose uye etherifying agents.
Neutralizer:
Sodium hydroxide (NaOH) kana potassium hydroxide (KOH): inoshandiswa kuderedza acid catalysts uye kugadzirisa pH panguva yekubatanidza.
purifier:
Sefa Aids: Yakasiyana-siyana mafirita aids anogona kushandiswa kubvisa tsvina uye zvisingadiwe ne-zvigadzirwa kubva mumusanganiswa wekuita.
Detergents: Kugeza nemvura kana zvimwe zvinonyungudutsa kunobatsira kubvisa makemikari asara uye tsvina kubva pachigadzirwa chekupedzisira.
Desiccant:
Mhepo kana ovheni kuomeswa: Mushure mekucheneswa, chigadzirwa chinogona kuve mhepo kana ovheni yakaomeswa kubvisa zvakasara zvinonyungudutsa uye hunyoro.
Quality control agent:
Analytical Reagents: Akasiyana-siyana reagents anoshandiswa kune zvemhando yekudzora zvinangwa kuona kuti zvigadzirwa zveHPMC zvinosangana nekuita kunodiwa uye zvakatemwa.
Kugadzirwa kwehydroxypropyl methylcellulose kunosanganisira kugadzirisa cellulose kuburikidza nekutevedzana kwemakemikari maitiro. Raw zvinhu zvinosanganisira cellulose, alkali, etherifying agent, catalyst, solvent, neutralizing agent, yekuchenesa agent uye desiccant, iyo inoita basa rakakosha mukuita synthesis. Iwo chaiwo mamiriro uye mareagents anoshandiswa anogona kusiyana zvichienderana neinodiwa zvivakwa uye mashandisirwo ekupedzisira hydroxypropyl methylcellulose chigadzirwa.
Nguva yekutumira: Zvita-21-2023