Methylcellulose (MC) yakajairika makemikari polymer zvinhu, yakagadziridzwa cellulose ether inowanikwa nemethylating natural cellulose. Nekuda kwehunhu hwayo hunokosha hwemuviri nemakemikari, inoshandiswa zvakanyanya mukuvaka, chikafu, mushonga, zvizorwa, mapepa uye machira.
1. Kurongwa nechiyero chekutsiva
Iyo dhigirii yekutsiva (DS) inoreva kukosha kweavhareji yemapoka ehydroxyl anotsiviwa nemapoka emethyl pane yega yega glucose unit mumethylcellulose. Kune matatu hydroxyl mapoka pane yega yega glucose mhete ye cellulose molecule inogona kutsiviwa ne methyl mapoka. Nokudaro, dhigirii yekutsinhanisa methylcellulose inogona kusiyana kubva ku0 kusvika ku3. Maererano nehuwandu hwekutsinhanisa, methylcellulose inogona kugoverwa muzvikamu zviviri: dhigirii yepamusoro yekutsinhanisa uye dhigirii yakaderera yekutsiva.
High degree of substitution methylcellulose (DS> 1.5): Iri rudzi rwechigadzirwa rine dhigirii yakakwirira yemethyl substitution, saka yakanyanya hydrophobic, ine yakaderera solubility uye yakanaka kudzivirira mvura. Inowanzoshandiswa mukuvaka zvinhu, machira uye zvimwe zviitiko zvinoda imwe dhigirii ye hydrophobicity.
Low degree of substitution methylcellulose (DS <1.5): Nekuda kwekushomeka kwemethyl substitution, rudzi urwu rwechigadzirwa rwakawanda hydrophilic, ine solubility iri nani uye inogona kunyungudika mumvura inotonhora. Yakaderera-inotsiva methylcellulose inoshandiswa zvakanyanya mumaindasitiri ezvekudya uye emishonga semukobvu, emulsifier uye stabilizer.
2. Kuronga nekushandisa
Zvinoenderana nekushandiswa kwemethylcellulose munzvimbo dzakasiyana, inogona kukamurwa kuita mapoka maviri: maindasitiri methylcellulose uye chikafu uye mishonga methylcellulose.
Industrial methylcellulose: Inonyanya kushandiswa pakuvaka, machira, papermaking, Ceramics uye mamwe maindasitiri se thickener, adhesive, firimu rekare, mvura inochengetedza mumiririri, etc. Muindasitiri yekuvaka, methylcellulose inoshandiswa simende uye gypsum zvigadzirwa kuvandudza kushanda kwekuvaka uye durability; muindasitiri yekupfekedza, methylcellulose inogona kuwedzera kugadzikana uye kupararira kwekupfeka.
Chikafu nemishonga methylcellulose: Nekuda kweiyo isiri-chepfu uye isingakuvadzi zvivakwa, methylcellulose inoshandiswa sechinhu chinowedzera muchikafu nemushonga. Muchikafu, methylcellulose yakajairika thickener uye emulsifier inogona kudzikamisa chimiro chekudya uye kudzivirira stratification kana kupatsanurwa; mumunda wemishonga, methylcellulose inogona kushandiswa se capsule shell, inotakura zvinodhaka, uye inewo basa rekugara-kusunungurwa zvinodhaka. Kugoneka kwayo uye kuchengetedzeka kunoita kuti methylcellulose ive yakakurumbira mundima mbiri idzi.
3. Kuronga nekunyungudika
Methylcellulose inonyanya kukamurwa kuita mapoka maviri maererano nekunyungudika: mvura inotonhora inonyungudika mhando uye organic solvent soluble type.
Mvura inotonhora soluble methylcellulose: Iyi mhando yemethylcellulose inogona kunyungudutswa mumvura inotonhora kuti iite yakajeka, viscous mhinduro mushure mekuparadzwa. Inowanzoshandiswa mumaindasitiri ezvekudya uye emishonga seyakakora kana firimu rekare. Kunyungudika kwerudzi urwu rwemethylcellulose kunodzikira nekuwedzera tembiricha, saka ficha iyi inogona kushandiswa pakuvaka kutonga kana ichishandiswa muindasitiri yekuvaka.
Organic solvent soluble methylcellulose: Iyi mhando yemethylcellulose inogona kunyungudutswa mune organic solvents uye inowanzoshandiswa mupendi, machira uye mamwe maindasitiri minda inoda organic chikamu media. Nekuda kwemaitiro ayo akanaka ekugadzira firimu uye kupikisa kwemakemikari, yakakodzera kushandiswa pasi pemamiriro ekunze akaomarara.
4. Kurongwa ne molecular uremu (viscosity)
Iyo molecular huremu hwemethylcellulose ine mhedzisiro yakakosha pane yayo yemuviri zvimiro, kunyanya iyo viscosity kuita mune mhinduro. Zvinoenderana nehuremu hwemamorekuru, methylcellulose inogona kukamurwa kuita yakaderera viscosity mhando uye yakakwirira viscosity mhando.
Low viscosity methylcellulose: Iyo molecular uremu idiki uye mhinduro viscosity yakaderera. Inowanzoshandiswa muzvokudya, mishonga uye zvizorwa, kunyanya emulsification, kumiswa uye thickening. Low-viscosity methylcellulose inogona kuchengetedza fluidity yakanaka uye kufanana, uye inokodzera maapplication anoda yakaderera-viscosity mhinduro.
High-viscosity methylcellulose: Iine huremu hwakakura hwema molecular uye inoumba mhinduro yepamusoro-soro mushure mekuparadzwa. Inowanzoshandiswa mukuvaka zvinhu, machira uye maindasitiri adhesives. High-viscosity methylcellulose inogona kunyatsowedzera simba remagetsi, kupfeka kusagadzikana uye kunamatira kwemhinduro, saka inoshandiswa zvakanyanya muzvinhu zvinoda simba rakakwirira uye kukwirira kupfeka kusagadzikana.
5. Kurongwa nehuwandu hwekugadzirisa kemikari
Methylcellulose ikemikari yakagadziridzwa cellulose derivative. Zvinoenderana neiyo nzira yekushandura uye dhigirii, inogona kukamurwa kuita imwechete methyl cellulose uye composite yakagadziridzwa cellulose.
Single methyl cellulose: inoreva cellulose ethers inongo tsiviwa nemethyl. Rudzi urwu rwechigadzirwa rune zvakadzikama zvemuviri uye makemikari zvimiro, uye kunyungudika kwaro, kukora uye kugadzira firimu zvinhu zvakanaka.
Composite modified cellulose: Kuwedzera kune methylation, inowedzerwazve kemikari kurapwa, senge hydroxypropylation, ethylation, zvichingodaro, kugadzira chigadzirwa chakagadziridzwa chakaumbwa. Semuenzaniso, hydroxypropyl methylcellulose (HPMC) uye carboxymethyl cellulose (CMC). Aya ma composite akagadziridzwa ma cellulose anowanzo kuve nani kunyungudika kwemvura, kupisa kupisa uye kugadzikana, uye anogona kuenderana nehupamhi hwezvido zveindasitiri.
6. Kurongwa neindasitiri yekushandisa
Iko kushandiswa kwakakura kwemethylcellulose inobvumira kuti igoverwe maererano nemaitiro ayo ekushandisa mumaindasitiri akasiyana.
Indasitiri yekuvaka methylcellulose: Inonyanya kushandiswa mune simende-yakavakirwa uye gypsum-yakavakirwa zvinhu senge inochengetedza mvura uye thickener. Inogona kuvandudza kushanda kwezvinhu zvekuvaka, kudzivirira kurasikirwa kwemvura kwekutanga, uye kuwedzera simba remagetsi rezvigadzirwa zvakapedzwa.
Indasitiri yechikafu methylcellulose: Senge emulsifier, thickener uye stabilizer mukugadzira chikafu. Inogona kudzivirira kurasikirwa kwemvura, kuvandudza kuravira uye chimiro chekudya, uye kuwedzera hupenyu hwesherufu yekudya.
Pharmaceutical industry methylcellulose: Sepiritsi binder kana inoenderera-inoburitswa zvinhu zvemishonga. Methylcellulose inogona zvakare kushandiswa mukugadzirira kwegastrointestinal zvinodhaka seyakachengeteka uye inoshanda inotakura zvinodhaka.
Cosmetic indasitiri methylcellulose: Muzvigadzirwa zvekuchengetedza ganda uye zvizorwa, methylcellulose inoshandiswa seyakakora, emulsifier uye moisturizer kubatsira zvigadzirwa kuumba yakapfava uye yakatsetseka magadzirirwo uku ichirebesa iyo moisturizer.
Muchidimbu, kune nzira dzakawanda dzekuisa methylcellulose, iyo inogona kuverengerwa zvinoenderana neayo kemikari chimiro maitiro, kana zvinoenderana neminda yayo yekushandisa uye solubility zvivakwa. Idzi nzira dzakasiyana dzekuisa nzira dzinotibatsira kunzwisisa zviri nani maitiro uye mashandiro emethylcellulose, uye zvakare inopa hwaro hwekufungidzira hwekushandiswa kwayo munzvimbo dzakasiyana.
Nguva yekutumira: Oct-23-2024