Ndezvipi zvigadzirwa zveHPMC?

HydroxyPropyl methylcellose (HPMC) inzvimbo yezvinhu zvakasiyana-siyana nehuremu hwekushandisa mumasango akasiyana-siyana mune dzakasiyana-siyana maindasitiri, kusanganisira mishonga yemishonga, kuvakwa, chikafu, uye zvidyarwa. Izvo zvinhu zvisina kugadzirwa zvinoshandiswa mukugadzirwa kweHPMC zvinobva kune zvakasikwa uye zvinotsigirwa zviwanikwa.

HPMC ndeye semisynthetic inobva cellulose, iyo yepamhepo polymer inowanikwa mumasango masero emadziro. Iyo zvinhu zvigadzirwa zvakagadzirwa neHPMC inosanganisira cellulose uye procyleo oxide. Iyo yakagadzirwa zvinhu uye synthesis maitiro inotsanangurwa zvakadzama pazasi:

1. Cellulose:

Kwayedza: Iyo huru zvinyorwa zveHPMC ndeye cellulose, iyo inobviswa kubva kune huni pripm kana machira fiber. Wood wallp ndiyo yakajairika sosi nekuda kwekuwanda kwayo uye mutengo-kushanda.
Kuparadzaniswa: Kuparadzanisa Cellulose kubva kune zvigadzirwa zvekushandisa uchishandisa akasiyana emakemikari uye michina maitiro. Wood Praps inobatwa nemakemikari kuti ibvise kusvibiswa uye kubvisa cellulose machira.

2. Profyleo oxide:

Kwayaka: Propylexe oxide chikamu chakakosha cheSynthetic HPMC uye chinobva profily, petrochemical yakawanikwa panguva yekuchena mafuta kunatswa.
Kugadzira: PropyLexe oxide inowanzogadzirwa kuburikidza nemaitiro emakemikari anonzi chilorohydrins kana epoxidation. Mukuita uku, propylele inobata ne chlorine kana hydrogen peroxide kune fomu propicyo oxide.

3. Methylation Reaction:

Kuwedzera: Iyo synthesis yeHPMC inosanganisira iyo eretera ye cellulose ine profilyone oxide. Maitiro aya anonziwo methylation, mune iyo hydroxypruspropyl mapoka anounzwa muCellulose Backbone.
Alkali kurapwa: kurapa cellulose ine alkali (kazhinji sodium hydroxide) kuti udzore mapoka ehydroxyl. Izvi zvinovaita kuti vatorezve panguva inotevera kuita pamwe neProcleene oxide.

4. Degree of Methylation:

Dzora: Dzora iyo degree reMethylation (DS) panguva yekuita kuti uwane zvivakwa zvaunoda zveHPMC. Iyo degree rekutsiva rinobata iyo solubility, viscosity, uye zvimwe zvinhu zvechigadzirwa chekupedzisira.
Hydroxyprupropylation:

Reaction: Iyo yakagadziriswa cellulose inozoitwa neiyo profyeryxe oxide pasi pekudzorwa mamiriro. Izvi zvinoguma nekutsiva kwehydroxypruspropyl mapoka pamwe neCellulose Chain.
Tembiricha uye kumanikidzwa: nokungwarira kutonga maitiro, kusanganisira tembiricha uye kumanikidzwa, kuve nechokwadi chekushanda zvakanaka uye kuguma kwechigadzirwa mhando.

5. Kusaruramisa nekugeza:

Acid kusarerekera: mushure mekuita, chigadzirwa chakarerekera ne acid kubvisa yakawandisa base.
Kushambidza: Hpmc inoshambwa kuti ibvise kusvibiswa, isina kugadziriswa zvinhu, uye ne-zvigadzirwa. Iyi nhanho yakakosha kuti uwane yakanyanya kuchena kwekupedzisira chigadzirwa.

6. Kuomesa:

Kubviswa kwemvura: Nhanho yekupedzisira ndeyekuomesa HPMC kuti ibvise chero chinyoro chasara. Iyi mafomu HPMC muPowder fomu, iyo inogona kuenderera mberi yakagadziriswa uye inoshandiswa mune dzakasiyana siyana dzekushandisa.

Zvinyorwa zveHPMC zvinonyanya kusanganisira cellulose zvinobva mudanda rehuni kana machira fiber uye propicy oxide inotorwa kubva petrochemical propalyne. Maitiro eSynthesis anosanganisira methylation, hydroxyprirlation, kusarerekera, kusuka uye kuoma, uye maitiro ekunyatso kudzorwa kuti uwane zvivakwa zve polymer. HPMC's inosanganisira inoitika kubva pane yayo yakasarudzika yemakemikari chimiro, ichiita kuti ive yakakosha mune zvigadzirwa zvakasiyana siyana.