Hydroxypropyl methylcellulose (HPMC) musanganiswa unoshanda unoshandiswa zvakanyanya mumaindasitiri akasiyana siyana nekuda kwekusiyana kwemakemikari kuumbwa uye zvivakwa.
1. Kemikari yakagadzirwa:
a.Cellulose musana:
HPMC is a cellulose derivative, zvinoreva kuti inotorwa kubva ku cellulose, yakasikwa polysaccharide inowanikwa muchirimwa sero madziro.Cellulose inosanganisira kudzokorora zvikamu zve β-D-glucose yakabatanidzwa ne β (1→ 4) glycosidic bonds.
b.Kutsiva
MuHPMC, iyo hydroxyl (-OH) moiety ye cellulose musana inotsiviwa ne methyl uye hydroxypropyl mapoka.Kutsiva uku kunoitika kuburikidza ne etherification reaction.Degree of substitution (DS) inoreva huwandu hweavhareji yemapoka ehydroxyl anotsiviwa neglucose unit mucheni ye cellulose.Iyo DS yemethyl uye hydroxypropyl mapoka akasiyana, ayo anokanganisa mashandiro eHPMC.
2. Synthesis:
a.Etherification:
HPMC inogadzirwa kuburikidza ne etherification reaction ye cellulose ine propylene oxide uye methyl chloride.Maitiro acho anosanganisira kuita cellulose nepropylene oxide kuunza hydroxypropyl mapoka uyezve nemethyl chloride kuunza methyl mapoka.
b.Degree yeimwe nzira yekudzora:
Iyo DS yeHPMC inogona kudzorwa nekugadzirisa maitiro ekuita senge tembiricha, nguva yekuita, uye reactant concentration.
3. Kuita:
a.Solubility:
HPMC inonyungudika mumvura uye mamwe organic solvents, senge methanol uye ethanol.Nekudaro, kunyungudika kwayo kunodzikira nekuwedzera kwema molecular uremu uye dhigirii rekutsiva.
b.Kugadzira firimu:
HPMC inoumba firimu rakajeka, rinoshanduka kana ranyungudutswa mumvura.Aya mafirimu ane simba rakanaka remagetsi uye zvipingamupinyi.
C. Viscosity:
HPMC mhinduro dzinoratidza pseudoplastic maitiro, zvichireva kuti viscosity yavo inodzikira nekuwedzera shear rate.Iyo viscosity yeHPMC mhinduro inoenderana nezvinhu zvakaita sekutarisa, uremu hwemamorekuru, uye dhigirii rekutsiva.
d.Kuchengeta mvura:
Chimwe chezvinhu zvakakosha zveHPMC kugona kwayo kuchengetedza mvura.Ichi chivakwa chakakosha mukushandisa kwakasiyana senge zvekuvaka, uko HPMC inoshandiswa seyakakora uye inochengetedza mvura.
e.Kunamatira:
HPMC inowanzo shandiswa seanonamira mumaindasitiri akasiyana siyana nekuda kwekugona kwayo kugadzira zvisungo zvakasimba kune akasiyana substrates.
4. Application:
a.Pharmaceutical industry:
Mumishonga yemishonga, HPMC inoshandiswa sebhainda, bhaisikopo rekunamira mumiririri, inodzorwa kuburitsa mumiririri, uye viscosity modifier mukugadzira piritsi.
b.Indasitiri yekuvaka:
HPMC inowedzerwa kune simende-based mortars, gypsum-based plasters uye mataira anonamira kuvandudza kushanda, kuchengetedza mvura uye kunamatira.
C. indasitiri yezvekudya:
Muindasitiri yechikafu, HPMC inoshandiswa seyakakora, stabilizer uye emulsifier muzvigadzirwa zvakaita sesosi, madhirezi uye ice cream.
d.Zvigadzirwa zvekuchengeta wega:
HPMC inoshandiswa seyakakora, emulsifier uye yekugadzira firimu muzvigadzirwa zvekuchengeta zvega zvakaita seshamposi, lotions nemafuta.
e.Paints uye Coatings:
Mune pendi uye machira, HPMC inoshandiswa kuvandudza pigment dispersion, viscosity control uye kuchengetedza mvura.
Hydroxypropylmethylcellulose (HPMC) isanganiswa inogoneka ine huwandu hwakasiyana hwekushandisa mumaindasitiri akasiyana siyana.Yayo yakasarudzika makemikari kuumbwa, synthesis uye zvivakwa zvinoita kuti ive chinhu chakakosha mumishonga yemishonga, zvekuvakisa, chikafu, zvigadzirwa zvekuchengeta uye pendi / machira.Kunzwisisa zvivakwa zveHPMC kunobvumira macustomer applications mundima dzakasiyana, zvichibatsira mukupararira kwayo kushandiswa uye kukosha mumaitiro emazuva ano ekugadzira.
Nguva yekutumira: Feb-22-2024