Methylcellulose (MC) chinhu chinowanzo shandiswa nemakemikari kugadzira polymer, cellulose ether yakagadziriswa inowanikwa ne methylating natural cellulose. Nekuda kwehunhu hwayo hwepanyama nemakemikari, inoshandiswa zvakanyanya mukuvaka, chikafu, mishonga, zvizoro, mapepa uye machira.
1. Kupatsanura nedanho rekutsiva
Dhigirii rekutsiva (DS) rinoreva avhareji yehuwandu hwema hydroxyl groups anotsiviwa nema methyl groups pa glucose unit yega yega mu methylcellulose. Kune mapoka matatu e hydroxyl pa glucose ring yega yega ye cellulose molecule anogona kutsiviwa nema methyl groups. Nokudaro, dhigirii rekutsiva methylcellulose rinogona kusiyana kubva pa 0 kusvika pa 3. Zvichienderana nedhigirii rekutsiva, methylcellulose inogona kukamurwa muzvikamu zviviri: dhigirii repamusoro rekutsiva uye dhigirii repasi rekutsiva.
Dhigirii repamusoro re methylcellulose inotsiva (DS > 1.5): Rudzi urwu rwechigadzirwa rune mwero wepamusoro we methyl inotsiva, saka haruna kunyungudika zvakanyanya, haruna kunyungudika kwakawanda uye haruna mvura yakawanda. Inowanzoshandiswa muzvinhu zvekuvaka, machira uye zvimwe zviitiko zvinoda mwero wekuti haruna kunyungudika zvakanyanya.
Dhigirii shoma rekuchinja methylcellulose (DS < 1.5): Nekuda kwekusachinja methyl zvishoma, rudzi urwu rwechigadzirwa runopfava zvakanyanya, runonyungudika zviri nani uye runogona kunyungudutswa mumvura inotonhora. Methylcellulose isingatsiviwe zvakanyanya inoshandiswa zvakanyanya mumaindasitiri ezvekudya nemishonga sechinosimbisa, chinosanganisa uye chinosimbisa.
2. Kupatsanura nekushandiswa
Zvichienderana nekushandiswa kwemethylcellulose muminda yakasiyana, inogona kukamurwa muzvikamu zviviri: industrial methylcellulose uye food and pharmaceutical methylcellulose.
Methylcellulose yemuindasitiri: Inonyanya kushandiswa mukuvaka, kuputira, kugadzira mapepa, kugadzira zviumbwa zvesimbi uye mamwe maindasitiri sechinosimbisa, chinonamira, chinoisa firimu, chinochengetedza mvura, nezvimwewo. Muindasitiri yekuvaka, methylcellulose inoshandiswa muzvigadzirwa zvesimende negypsum kuvandudza mashandiro ekuvaka uye kugara kwenguva refu; muindasitiri yekudzikisa, methylcellulose inogona kuwedzera kugadzikana uye kupararira kwekudzikisa.
Chikafu neMethirulose yeMishonga: Nekuda kwehunhu hwayo husina chepfu uye husina njodzi, methylcellulose inoshandiswa sechinhu chinowedzera mukudya nemumishonga. Mukudya, methylcellulose chinhu chinowanzo simbisa uye chinosanganisa chikafu chinogona kudzikamisa chimiro chechikafu nekudzivirira kupatsanurwa kana kuparadzaniswa; mumunda wemishonga, methylcellulose inogona kushandiswa sekapusule shell, inotakura mishonga, uye ine basa remishonga inoburitswa kwenguva refu. Kudyiwa kwayo uye kuchengetedzeka kwayo zvinoita kuti methylcellulose ive yakakurumbira zvikuru muminda iyi miviri.
3. Kupatsanurwa nekunyungudika
Methylcellulose yakakamurwa zvikuru muzvikamu zviviri maererano nekunyungudika: rudzi rwekunyungudika mumvura inotonhora uye rudzi rwekunyungudika kweorganic solvent.
Methylcellulose inonyungudika mumvura inotonhora: Rudzi urwu rwemethylcellulose runogona kunyungudika mumvura inotonhora kuti ruite mhinduro yakajeka, ine viscous mushure mekunyungudika. Inowanzo shandiswa mumaindasitiri ezvekudya nemishonga sechinhu chinogodza kana kugadzira firimu. Kunyungudika kwerudzi urwu rwemethylcellulose kunoderera nekupisa kuri kuwedzera, saka chinhu ichi chinogona kushandiswa kudzora kuvaka kana chikashandiswa muindasitiri yekuvaka.
Methylcellulose inonyungudika inonyungudika: Rudzi urwu rwemethylcellulose runogona kunyungudika muzvinhu zvinonyungudika uye runowanzo shandiswa mumapendi, machira uye mamwe maindasitiri anoda zvinhu zvinonyungudika. Nekuda kwehunhu hwayo hwakanaka hwekugadzira firimu uye kuramba kwayo makemikari, yakakodzera kushandiswa mumamiriro ezvinhu akaoma eindasitiri.
4. Kupatsanurwa nehukuru hwemamorekuru (viscosity)
Kurema kwemolekyuru yemethylcellulose kune simba guru pahunhu hwayo hwepanyama, kunyanya mashandiro e viscosity mumushonga. Zvichienderana nehuremu hwemolekyuru, methylcellulose inogona kukamurwa kuva mhando ye viscosity yakaderera uye mhando ye viscosity yakakwirira.
Methylcellulose ine viscosity yakaderera: Huremu hwemolecular hudiki uye viscosity yemhinduro yakaderera. Inowanzoshandiswa mukudya, mishonga uye zvizoro, kunyanya pakugadzira emulsification, suspension uye thickening. Methylcellulose ine viscosity yakaderera inogona kuchengetedza fluidity yakanaka uye yakafanana, uye yakakodzera kushandiswa kunoda mhinduro dzine viscosity yakaderera.
Methylcellulose ine viscosity yakakura: Ine huremu hwakawanda uye inoumba mhinduro ine viscosity yakawanda mushure mekunyungudika. Inowanzo shandiswa muzvinhu zvekuvaka, machira uye zvinonamira zvemaindasitiri. Methylcellulose ine viscosity yakawanda inogona kuwedzera simba remuchina, kuramba kupfeka uye kunamira kwemushonga, saka inoshandiswa zvakanyanya muzvinhu zvinoda simba rakawanda uye kuramba kupfeka zvakanyanya.
5. Kupatsanurwa nedanho rekuchinja kwemakemikari
Methylcellulose chinhu chinobva mu cellulose chakagadziriswa nemakemikari. Zvichienderana nenzira yekuchinja uye mwero, inogona kukamurwa kuita single methyl cellulose uye composite modified cellulose.
Single methyl cellulose: zvinoreva cellulose ethers dzinongotsiviwa nemethyl. Rudzi urwu rwechigadzirwa rune hunhu hwakagadzikana hwemuviri nemakemikari, uye hunhu hwacho hwekunyunguduka, kukora uye kugadzira firimu hwakanaka.
Composite modified cellulose: Pamusoro pemethylation, inorapwawo nemakemikari, senge hydroxypropylation, ethylation, nezvimwewo, kuti igadzire chigadzirwa chakagadziriswa. Semuenzaniso, hydroxypropyl methylcellulose (HPMC) uye carboxymethyl cellulose (CMC). Aya macomposite modified cellulose anowanzo kuve nekunyungudika kuri nani mumvura, kuramba kupisa uye kugadzikana, uye anogona kuchinjika kune zvakasiyana-siyana zvinodiwa mumaindasitiri.
6. Kupatsanurwa neindasitiri yekunyorera
Kushandiswa kwakakura kwemethylcellulose kunoita kuti ikwanise kupatsanurwa zvichienderana nemaitiro ayo mumabasa akasiyana.
Indasitiri yekuvaka methylcellulose: Inonyanya kushandiswa muzvinhu zvakagadzirwa nesimende negypsum senzira yekuchengetedza mvura uye kuisimbisa. Inogona kuvandudza mashandiro ezvigadzirwa zvekuvaka, kudzivirira kurasikirwa nemvura nekukurumidza, uye kuwedzera simba remuchina wezvigadzirwa zvakagadzirwa.
Methylcellulose inoshandiswa muindasitiri yechikafu: Semushonga unosimbisa, unosimbisa uye unosimbisa kugadzirwa kwechikafu. Inogona kudzivirira kurasikirwa nemvura, kunatsiridza kunaka uye chimiro chechikafu, uye kuwedzera hupenyu hwechikafu.
Methylcellulose inoshandiswa muindasitiri yemishonga: Semushonga wekubatanidza mapiritsi kana chinhu chinogara kwenguva refu chemishonga. Methylcellulose inogona kushandiswawo mukugadzira mishonga yemudumbu semutakuri wemishonga wakachengeteka uye unoshanda.
Indasitiri yezvigadzirwa zvekuchenesa ganda nezvigadzirwa zvekuchenesa ganda, methylcellulose inoshandiswa semushonga unosimbisa ganda, emulsifier uye moisturizer kubatsira zvigadzirwa kugadzira magadzirirwo akapfava uye akatsetseka ukuwo ichiramba ichinyorovesa.
Muchidimbu, kune nzira dzakawanda dzekuisa methylcellulose mumapoka, iyo inogona kuiswa mumapoka zvichienderana nemaitiro ayo emakemikari, kana zvichienderana nenzvimbo dzayo dzekushandiswa uye hunhu hwekunyungudika. Nzira idzi dzakasiyana dzekuisa mumapoka dzinotibatsira kunzwisisa zviri nani hunhu nemabasa emethylcellulose, uye zvakare dzinopa hwaro hwedzidziso yekushandiswa kwayo mumapoka akasiyana.
Nguva yekutumira: Gumiguru-23-2024