Kodi kununkhira kwa hydroxypropyl methylcellulose (HPMC) kumakhudza bwanji khalidweli?

Momwe mungadziwire mtundu wa hydroxypropyl methylcellulose (HPMC) ndi funso lomwe makasitomala ndi abwenzi ambiri akuda nkhawa nalo. Masiku ano, Xinhe Shanda Cellulose akufotokoza mwachidule momwe angaweruzire mtundu wa hydroxypropyl methylcellulose (HPMC) Poyang'ana ubwino wa mankhwala:

Choyamba, tiyenera kumvetsetsa njira yopanga hydroxypropyl methylcellulose:

Hydroxypropyl methylcellulose, yemwenso amadziwika kuti hypromellose ndicellulose hydroxypropyl methyl ether, imapangidwa ndi cellulose ya thonje yoyera kwambiri ngati zopangira, zomwe zimapangidwira mwapadera pansi pamikhalidwe yamchere.

Kaphatikizidwe wa hydroxypropyl methylcellulose: chitirani thonje woyengedwa mapanelo ndi sopo pa 35-40 ° C kwa theka la ola, kanikizani, phwanya mapadilo, ndikukalamba bwino pa 35 ° C kuti apange pafupifupi digiri ya polymerization ya alkali yomwe mwapeza. fiber mkati mwa mulingo womwe mukufuna. Ikani ulusi wa alkali mu ketulo ya etherification, onjezerani propylene oxide ndi methyl chloride motsatizana, ndipo etherify pa 50-80 ° C kwa maola 5, kupanikizika kwakukulu kumakhala pafupifupi 1.8MPa. Kenako onjezerani kuchuluka kwa hydrochloric acid ndi oxalic acid kumadzi otentha pa 90 ° C kuti musambe zinthuzo kuti muwonjezere voliyumuyo. Dehydrate mu centrifuge. Sambani mpaka osalowerera ndale, ndipo pamene madzi omwe ali muzinthuzo ndi otsika kuposa 60%, ziumeni ndi mpweya wotentha pa 130 ° C mpaka zosakwana 5%.

HPMC yopangidwa ndi njira yosungunulira imagwiritsa ntchito toluene ndi isopropanol ngati zosungunulira. Ngati kutsukako sikuli bwino, padzakhala fungo lotsalira. Izi ndizovuta ndi ndondomeko yotsuka, ndipo sizimakhudza ntchito ndipo palibe vuto, koma zenizeni The hydroxypropyl methylcellulose yopangidwa ndi opanga ambiri imakhala ndi fungo lamphamvu kwambiri komanso fungo lopweteka. Ubwino wamtunduwu suli wokwanira.

Hypromellose ndi woyengedwa thonje impregnated ndi osowa madzi kupeza zamchere mapadi, ndiye kuwonjezera zosungunulira, etherification wothandizira, toluene, ndi isopropanol chifukwa etherification anachita, ndi kupeza chomalizidwa pambuyo neutralization, kutsuka, kuyanika, ndi kuphwanya. Osati zabwino, zidzanunkhiza, kotero ogwiritsa ntchito akhoza kuzigwiritsa ntchito molimba mtima.