Methylcellulose (MC) uye carboxymethylcellulose (CMC) maviri akajairika cellulose derivatives, anoshandiswa zvakanyanya mukudya, mushonga, kuvaka, indasitiri yemakemikari uye mamwe minda. Kunyangwe iwo ese akagadziridzwa kemikari kubva pachisikigo cellulose, pane misiyano yakakura muchimiro chemakemikari, zvemuviri uye makemikari zvimiro, uye mashandisiro.
1. Chimiro chemakemikari uye nzira yekugadzirira
Methylcellulose inogadzirwa nekuita cellulose nemethyl chloride (kana methanol) pasi pemamiriro ealkaline. Munguva iyi, chikamu chemapoka ehydroxyl (-OH) mumamorekuru e cellulose anotsiviwa nemapoka emethoxy (-OCH₃) kugadzira methylcellulose. Iyo dhigirii yekutsiva (DS, nhamba yezvinotsiva paglucose unit) yemethylcellulose inotaridza iyo yemuviri uye makemikari zvimiro, senge solubility uye viscosity.
Carboxymethylcellulose inogadzirwa nekuita cellulose ne chloroacetic acid pasi pemamiriro ealkaline, uye boka rehydroxyl rinotsiviwa necarboxymethyl (-CH₂COOH). Iyo dhigirii yekutsiva uye dhigirii repolymerization (DP) yeCMC inokanganisa kunyungudika kwayo uye viscosity mumvura. CMC inowanzovapo muchimiro chesodium munyu, inonzi sodium carboxymethylcellulose (NaCMC).
2. Muviri uye makemikari zvinhu
Solubility: Methylcellulose inonyungudika mumvura inotonhora, asi inorasikirwa nekunyungudika uye inoumba gel mumvura inopisa. Uku kudzoreredzwa kwemafuta kunogonesa kushandiswa kwayo seyakakora uye gelling mumiriri mukugadzirisa chikafu. CMC inonyungudika mumvura inotonhora uye inopisa, asi viscosity yemhinduro yayo inodzikira sezvo tembiricha inowedzera.
Viscosity: Iyo viscosity yezvose zviri kukanganiswa nedhigirii rekutsiva uye kugadzirisa kugadzirisa. Iyo viscosity yeMC inotanga kuwedzera uye yozodzikira sezvo tembiricha inowedzera, nepo viscosity yeCMC ichiderera sezvo tembiricha inowedzera. Izvi zvinovapa ivo pachavo mabhenefiti mune akasiyana maindasitiri ekushandisa.
pH kugadzikana: CMC inoramba yakagadzikana pamusoro pehupamhi pH renji, kunyanya pasi pemamiriro ealkaline, izvo zvinoita kuti ive yakakurumbira seyakadzikama uye thickener muchikafu nemishonga. MC haina kugadzikana pasi pekusarerekera uye zvishoma alkaline mamiriro, asi inoshatisa mune yakasimba asidhi kana alkalis.
3. Nzvimbo dzekushandisa
Indasitiri yechikafu: Methylcellulose inowanzoshandiswa muchikafu seyakakora, emulsifier uye stabilizer. Semuenzaniso, inogona kutevedzera kuravira uye kuumbwa kwemafuta pakugadzira chikafu chine mafuta mashoma. Carboxymethylcellulose inoshandiswa zvakanyanya muzvinwiwa, zvinhu zvakabikwa uye zvigadzirwa zvemukaka seyakakora uye stabilizer kudzivirira kuparadzaniswa kwemvura nekuvandudza kuravira.
Indasitiri yemishonga: Methylcellulose inoshandiswa mukugadzirwa kwemapiritsi emishonga sebhainda uye disintegrant, uyewo semafuta uye anodzivirira, zvakadai semadonhwe emeso emeso sechinzvimbo chemisodzi. CMC inoshandiswa zvakanyanya mukurapa nekuda kweiyo yakanaka biocompatibility, senge gadziriro yemishonga inoburitswa-inoburitswa uye zvinonamira mumadonhwe emeso.
Indasitiri yekuvaka uye yemakemikari: MC inoshandiswa zvakanyanya mukuvaka zvinhu seyakakora, inochengetedza mvura mumiriri uye inonamira simende uye gypsum. Inogona kuvandudza kushanda kwekuvaka uye pamusoro pemhando yezvinhu. CMC inowanzo shandiswa mukurapa madhaka mumigodhi yemunda wemafuta, slurry mukudhinda machira uye dhayi, kupeta pamusoro pepepa, nezvimwe.
4. Kuchengetedza uye kuchengetedzwa kwezvakatipoteredza
Ose ari maviri anoonekwa akachengeteka kuti ashandiswe muchikafu nemishonga yekushandisa, asi kwaanobva uye maitiro ekugadzira anogona kuve neanokanganisa akasiyana pane nharaunda. Izvo zvigadzirwa zveMC neCMC zvakatorwa kubva kune yakasikwa cellulose uye zvinoodza, saka vanoita zvakanaka maererano nekushamwaridzana kwezvakatipoteredza. Nekudaro, maitiro avo ekugadzira anogona kusanganisira makemikari zvinonyungudutsa uye reagents, izvo zvinogona kuve nemhedzisiro pane zvakatipoteredza.
5. Mutengo uye kudiwa kwemusika
Nekuda kwemaitiro akasiyana ekugadzira, mutengo wekugadzira methylcellulose unowanzo kukwira, saka mutengo wayo wemusika wakakwirawo kupfuura carboxymethylcellulose. CMC kazhinji ine kudiwa kukuru kwemusika nekuda kwekushandisa kwayo kwakafara uye kuderera kwemitengo yekugadzira.
Kunyangwe methylcellulose uye carboxymethylcellulose ese ari maviri anobva ku cellulose, ane misiyano yakakura muchimiro, zvivakwa, mashandisiro uye kudiwa kwemusika. Methylcellulose inonyanya kushandiswa muminda yechikafu, mishonga uye zvivakwa zvekuvaka nekuda kweiyo yakasarudzika yekupisa yekudzoreredza uye yakakwirira viscosity control. Carboxymethyl cellulose yakashandiswa zvakanyanya muchikafu, mushonga, petrochemical, machira uye mamwe maindasitiri nekuda kwekunyorovesa kwayo, viscosity kugadziridzwa uye yakafara pH kuchinjika. Sarudzo ye cellulose derivative zvinoenderana neiyo chaiyo application mamiriro uye zvinodiwa.
Nguva yekutumira: Aug-20-2024