Kodi kupanga methylcellulose ndi chiyani?

Methylcellulose (MC) ndi polymer yosungunuka yamadzi yomwe imagwiritsidwa ntchito kwambiri mu chakudya, mankhwala, mankhwala tsiku lililonse, zomanga ndi mafakitale ena. Njira zake zopanga zimaphatikizapo masitepe angapo, makamaka kuphatikiza ma cellulose, kusinthana, kuyanika ndi kuphwanya.

1. Kuchotsa kwa cellulose
Zopangira zoyambira za methylcelluse ndizosekula zachilengedwe, zomwe nthawi zambiri zimachokera ku mitengo yamitengo kapena thonje. Choyamba, nkhuni kapena thonje zimayang'aniridwa kuti muchotse zodetsa (monga Lignin, protein, protein, etc.) kuti mupeze cellulose yoyera. Njira zopangira zolaula zimaphatikizapo njira ya asidi ndi njira yosinthira. Mu njira ya asidi, mtengo kapena thonje la thonje amathandizidwa ndi sodium hydroxide (Naoh) kapena njira zina zamchere kuti musungunuke ndi zodetsa nkhawa.

2.
Chotsatira, chotsatira cha methylation (chizindikiritso) chimachitika kukonza methylclulose. Njira yoyeserera yoyeserera imayenera kuchitira cellulose ndi othandizira (nthawi zambiri methyl chloride, methyl iodide, etc.) kuti mupeze methylcellulose. Ntchito yake ili motere:

Kusankha kwa zosungunulira: Polar sol sol (monga madzi, ethanol kapena zosungunulira madzi ndi mowa) nthawi zambiri zimagwiritsidwa ntchito pochita bwino.
Zochitika: Zomwe zimachitika zimachitika kutentha kwina komanso kupanikizika, komanso kutentha kwa makonda ndi 50-70 ° C. Panthawi ya methyl chloride zomwe zimakhudzana ndi hydroxyl (-Oh) mu celluluse molekyu yosinthana ndi methyl cellulose.
Kuwongolera Kuchita: Kuchita kwa methylation kumafuna kuwongolera kwa nthawi ndi kutentha. Kutalika kwa nthawi yayitali kapena kutentha kwambiri kumatha kuyambitsa kuwonongeka kwa cellulose, pomwe zosakwanira kumatha kubweretsa methylation, kukhudza magwiridwe antchito a methyl cellulose.

3.. Kulowerera ndi kuyeretsa
Pambuyo poti zitheke, zosakanizidwa zopanda methylation ndi mphaka zimatha kukhalabe mu mankhwala a methyl celluse, zomwe zikuyenera kulowerera komanso kutsukidwa. Njira yodzisankhira nthawi zambiri imagwiritsa ntchito yankho la acidic (monga acetic acid yankho) kuti athetse zinthu za alkaline. Njira yoyeretsa imagwiritsa ntchito madzi ambiri kapena mowa kuti muchotse ma sol sol, mankhwala osavomerezeka komanso zopangidwa pambuyo pochita kuyeretsedwa kwa chinthu chomaliza.

4. Kuyanika ndi kuphwanya
Mukatsuka, nthawi zambiri methyllulose nthawi zambiri imakhala m'malo operekera kapena gels, motero zimayenera kuwuma kuti mupeze mankhwala osokoneza bongo. Pali njira zambiri zowuma, ndipo zogwiritsidwa ntchito nthawi zambiri zimaphatikizapo kuyanika utsi, kumasulira ndikuwuma. Panthawi yowuma, kutentha ndi chinyezi ndi chinyezi chofunikira kulamulidwa mosamalitsa kupewa matenda oyambitsidwa ndi kutentha kwambiri kapena kuwonongeka kwa gel.

Pambuyo pouma, kupezeka methyllulose kusefukira kumafunikira kuphwanyidwa kukula komwe kumafunikira. Njira yophwanya nthawi zambiri imatsirizika ndi mphero ya ndege kapena mphero yamakina. Mwa kuwongolera kukula kwa tinthu, kusinthika kwa chilengedwe ndi machitidwe a mafayilo a methylcellulose amatha kusintha.

5. Kuyendera ndi kuwunika kwa chomaliza
Pambuyo pophwanya, methyllulose yofunikira kuwongolera bwino kuti zitsimikizire kuti ikugwirizana ndi ukadaulo. Zinthu zomwe zimayendera monga:

Zolemba: Chinyontho chonyowa kwambiri cha methylcellulose chidzakhudza kukhazikika kwake ndikusunga.
Tinthu kukula kwa tinthu: kukula ndi kugawa kwa tinthu kumakhudza kusungunuka kwa methylcelulose.
Ma digiri ya methylation: digiri ya methylation ndi chizindikiro chachikulu kuti muchepetse mtundu wa methylcellulose, zomwe zikukhudza kusungunuka kwake ndikugwirira ntchito.
Solubility ndi mafayilo: kusungunuka ndi ufa wa methylcellulose ndi magawo ofunikira pakugwiritsa ntchito, makamaka mu gawo la chakudya ndi mankhwala.
Pambuyo podutsa kuyang'ana, chinthucho chidzadzaza malinga ndi zosowa zosiyanasiyana, nthawi zambiri m'matumba apulasitiki kapena zikwama za pepala, komanso zolembedwa ndi nambala ya ma batch, zomwe zimachitika, tsiku lopanga ndi zina.

6. Kuteteza zachilengedwe ndi chitetezo chachilengedwe
Pa nthawi yopanga methyl cellulose, kutetezedwa koyenera kwachilengedwe kumayenera kutengedwa, makamaka kwa mankhwala ndi ma sol solcor omwe amagwiritsidwa ntchito pochita. Pambuyo pochita, kutaya madzi ndi mafuta owononga ayenera kuthandizidwa kuti asayike chilengedwe. Kuphatikiza apo, ma reagents mankhwala mu kapangidwe kapangidwe kayenera kuchitika mosamalitsa ndi njira zogwirira ntchito chitetezo kuti zitsimikizire chitetezo cha ogwira ntchito.

Kupanga kwa methyl cellulose makamaka kumaphatikizapo kuchotsera kwa cellulose, kuthiratu, kuchapa komanso kuwuma ndi kuphwanya. Chilumikizidwe chilichonse chimakhala ndi chofunikira pakupanga chomaliza, chifukwa chowongolera ndi kuwunikira muzopanga ndizovuta kwambiri. Kudzera pamachitidwe awa, methyl cellulose yomwe imakwaniritsa zofunika zosiyanasiyana ntchito zitha kupangidwa.