Focus on Cellulose ethers

Ilana Sintetiki Etherification ti Hydroxypropyl Methyl Cellulose (HPMC)

Hydroxypropyl methylcellulose (HPMC), aise cellulose, le jẹ ti refaini owu tabi igi ti ko nira, o jẹ gidigidi pataki lati fifun pa o ṣaaju ki o to alkalization tabi nigba alkalization, ati awọn crushing ni nipasẹ darí agbara Pa awọn akojọpọ be ti cellulose aise ohun elo lati din ìyí ti crystallinity ati polymerization, mu agbegbe oju rẹ pọ si, nitorinaa imudara iraye si ati agbara ifaseyin kemikali ti reagent ifaseyin si awọn ẹgbẹ hydroxyl mẹta lori ẹgbẹ oruka glukosi ti macromolecule cellulose.

Hydroxypropyl methylcellulose (HPMC) ni a lo bi sobusitireti ohun elo aise lati ṣe epo, eyiti o le mọ lilo gaari lapapọ, mu iwọn lilo ti awọn ohun elo aise dara, dinku iye to ku ti sobusitireti ninu omitooro bakteria, ati dinku idiyele ti omi idọti. itọju. Eleyi hydroxypropyl methylcellulose Awọn abuda kan ti methylcellulose ni o wa conducive si awọn iṣapeye ti ipele, je-ipele ati lemọlemọfún bakteria lakọkọ, etanje kan lẹsẹsẹ ti isoro bi iṣakoso awọn tiwqn ti awọn alabọde ati dilution oṣuwọn; o tun jẹ itara si ilana ilana ilana bakteria. Niwọn igba ti iṣẹ ti hydroxypropyl methylcellulose (HPMC) jẹ iru si awọn ethers miiran ti omi-omi, o le ṣee lo ni awọ latex ati awọn ohun elo kikun resini ti omi-tiotuka bi oluranlowo fiimu, thickener, emulsifier ati amuduro, ati bẹbẹ lọ. ti o dara yiya resistance, ipele ati adhesion, ati ki o ti dara si dada ẹdọfu, iduroṣinṣin to acid ati alkali, ati ibamu si ti fadaka pigments.

Etherification Sintetiki

Hydroxypropyl methylcellulose (HPMC) ni ipa ti o dara bi apọn fun omi funfun ti o da lori polyvinyl acetate kun. Iwọn iyipada ti ether cellulose ti pọ si, ati pe resistance si ogbara kokoro arun tun ni ilọsiwaju.

Botilẹjẹpe ilana isọdọkan etherification ti hydroxypropyl methyl cellulose (HPMC) ko ni idiju, o nilo lati wa ni alkalized, titu awọn ohun elo aise, ati alkalized. Ayika kọọkan ti etherification, imularada olomi, centrifugation, fifọ ati gbigbẹ jẹ nọmba nla ti awọn imọ-ẹrọ bọtini ati oye ọlọrọ.

Fun awọn oriṣiriṣi awọn ọja, agbegbe kọọkan ni awọn ipo iṣakoso tuntun, gẹgẹbi iwọn otutu, akoko, titẹ ati iṣakoso ṣiṣan ohun elo. Ohun elo iranlọwọ ati awọn ohun elo iṣakoso jẹ awọn iṣeduro ọjo fun didara ọja iduroṣinṣin ati awọn eto iṣelọpọ igbẹkẹle.


Akoko ifiweranṣẹ: Oṣu kejila-15-2022
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