Hydroxypropylmethylcellulose (HPMC) is a cellulose derivative inoshandiswa zvakanyanya mumaindasitiri akasiyana. Iko kushandiswa kukuru kweHPMC kwakafanana nekukora, zvinosimbisa uye emulsifiers mumaindasitiri ezvekudya, emishonga uye zvekuzora. HPMC inoshandiswawo muchikamu chekuvaka sesemende yekuwedzera, seyekuputira mahwendefa nemakapisi, uye semhinduro yemaziso. Iwo makuru ezvigadzirwa zveHPMC ndeye cellulose uye makemikari reagents.
Cellulose:
Cellulose ndiyo inonyanya kushandiswa pakugadzirwa kweHPMC. Cellulose ipolymer yechisikigo inowanikwa mumadziro esero rezvirimwa uye ndiyo yakawanda yakaringana polima paPasi. Iyo kemikari zvimiro zve cellulose yakafanana neHPMC, iyo inoita kuti ive yakakodzera mbishi zvinhu zvekugadzirwa kweHPMC. Cellulose inotorwa kubva kwakasiyana-siyana, kusanganisira huni, donje, uye zvirimwa zvakasiyana.
Iyo inonyanya kuzivikanwa sosi ye cellulose inoshandiswa pakugadzirwa kweHPMC ndeyehuni pulp. Huni pulp inotorwa kubva kune softwoods sespruce, pine uye fir. Wood pulp inobatwa nemakemikari kuputsa lignin uye hemicellulose, ichisiya pure cellulose. Iyo pure cellulose inobva yacheneswa uye yagezwa kubvisa chero tsvina.
Cellulose inoshandiswa kugadzirwa kweHPMC inofanirwa kunge iri yemhando yepamusoro uye matanho akasimba ekudzora mhando anofanirwa kuteverwa kuve nechokwadi chekuchena kweselulosi. Kuchena kwe cellulose kwakakosha sezvo tsvina inogona kukanganisa zvimiro zvechigadzirwa chekupedzisira.
Chemical reagents:
Kugadzirwa kweHPMC kunoda kushandiswa kweakasiyana makemikari reagents. Chemical reagents anoshandiswa mukugadzira HPMC anosanganisira propylene oxide, methyl chloride, sodium hydroxide, hydrochloric acid, nezvimwe.
Propylene oxide inoshandiswa kugadzira hydroxypropyl cellulose (HPC), inozoitwa nemethyl chloride kugadzira HPMC. HPC inopindirana nemethyl chloride kutsiva mamwe emapoka ehydroxyl pacheni ye cellulose nemapoka emethoxy uye hydroxypropyl, zvichigadzira HPMC.
Sodium hydroxide inoshandiswa mukugadzirwa kweHPMC kuwedzera pH kukosha kwemhinduro yekugadzirisa kubatsira kunyungudutsa cellulose.
Munguva yeHPMC yekugadzira maitiro, hydrochloric acid inoshandiswa kugadzirisa iyo pH kukosha kwemhinduro mhinduro.
Makemikari reagents anoshandiswa mukugadzirwa kweHPMC anofanirwa kunge ane hutsanana hwepamusoro, uye mamiriro ekuita anofanirwa kudzorwa nekuchenjera kuti ave nechokwadi chemhando yechigadzirwa chekupedzisira.
mukupedzisa:
Iwo makuru ezvigadzirwa zveHPMC ndeye cellulose uye makemikari reagents. Cellulose, inotorwa kubva kwakasiyana masosi anosanganisira huni, donje, uye zvirimwa zvakasiyana, ndiyo yekutanga mbishi kugadzirwa kweHPMC. Chemical reagents anoshandiswa mukugadzirwa kweHPMC anosanganisira propylene oxide, methyl chloride, sodium hydroxide uye hydrochloric acid. Kugadzirwa kweHPMC kunoda akasimba emhando yekudzora matanho kuti ave nechokwadi chekuchena kwezvinhu zvakabikwa uye mhando yechigadzirwa chekupedzisira. HPMC inoshandiswa zvakanyanya mumaindasitiri akasiyana siyana uye ine huwandu hwakawanda hwekushandisa nekuda kweiyo yakasarudzika zvivakwa.
Nguva yekutumira: Sep-06-2023