Sidee bay urta hydroxypropyl methylcellulose (HPMC) u saamaysaa tayada?

Sida loo go'aamiyo tayada hydroxypropyl methylcellulose (HPMC) waa su'aal ay macaamiil badan iyo saaxiibo badan ka walaacsan yihiin. Maanta, Xinhe Shanda Cellulose wuxuu soo koobayaa sida loo xukumo tayada hydroxypropyl methylcellulose (HPMC) Marka la qiimeeyo tayada alaabta:

Ugu horreyntii, waxaan u baahanahay inaan fahamno habka wax soo saarka ee hydroxypropyl methylcellulose:

Hydroxypropyl methylcellulose, oo sidoo kale loo yaqaan hypromellose iyocellulose hydroxypropyl methyl ether, waxay ka samaysan tahay cellulose suuf ah oo aad u saafi ah oo ah walxo ceeriin ah, taas oo si gaar ah loo miiray xaaladaha alkaline.

Isku-dubaridka hydroxypropyl methylcellulose: ku dawee cellulose suufka la safeeyey oo leh lye at 35-40 ° C nus saac, riix, burburin cellulose, iyo da'da si sax ah 35 ° C si aad u sameyso celceliska heerka polymerization ee alkali ee la helay. fiber gudaha xadka la rabo. Ku rid faybarka alkali ee kiliyaha etherification, ku dar propylene oxide iyo methyl chloride si isku xigta, oo ku ether ka 50-80 ° C ilaa 5 saacadood, cadaadiska ugu badan wuxuu ku saabsan yahay 1.8MPa. Ka dib ku dar qadar ku habboon oo ah hydrochloric acid iyo oxalic acid biyaha kulul ee 90 ° C si aad u dhaqdo alaabta si loo ballaariyo mugga. Fuuqbaxa ku jira centrifuge. Ku dhaq ilaa dhexdhexaad, iyo marka biyaha ku jira maadada ay ka hooseeyaan 60%, ku qalaji socodka hawo kulul 130 ° C ilaa content ka yar 5%.

HPMC-da ay soo saarto habka dareeraha waxay u isticmaashaa toluene iyo isopropanol sida dareere ahaan. Haddii maydhistu aanay wanaagsanayn, waxaa jiri doona xoogaa ur hara ah oo daciif ah. Tani waa dhibaato habka dhaqidda, oo ma saameynayso isticmaalka, mana jirto wax dhib ah, laakiin dhab ahaantii Hydroxypropyl methylcellulose ee ay soo saaraan warshado badan ayaa leh ur gaar ah oo xooggan iyo ur ur ah. Tayada noocaan ah xaqiiqdii ma aha ilaa heer.

Hypromellose waa suuf la safeeyey oo lagu shubay dareere naadir ah si loo helo cellulose alkaline, ka dibna ku dar dareeraha, wakiilka etherification, toluene, iyo isopropanol ee falcelinta etherification, oo hel badeecada dhammaatay ka dib dhexdhexaadinta, dhaqidda, qalajinta, iyo burburinta. Ma fiicna, way uraysaa, markaa isticmaalayaashu waxay u isticmaali karaan si kalsooni leh.