Pehea e pili ai ka ʻala o ka hydroxypropyl methylcellulose (HPMC) i ka maikaʻi?

Pehea e hoʻoholo ai i ka maikaʻi o ka hydroxypropyl methylcellulose (HPMC) kahi nīnau e hopohopo nui ai nā mea kūʻai aku a me nā hoaaloha. I kēia lā, hōʻuluʻulu ʻo Xinhe Shanda Cellulose pehea e hoʻoponopono ai i ka maikaʻi o ka hydroxypropyl methylcellulose (HPMC) E hoʻoholo ana i ka maikaʻi o ka huahana:

ʻO ka mea mua, pono mākou e hoʻomaopopo i ke kaʻina hana o ka hydroxypropyl methylcellulose:

ʻO Hydroxypropyl methylcellulose, i ʻike ʻia ʻo hypromellose a mecellulose hydroxypropyl methyl ether, Hana ʻia me ka pulupulu maʻemaʻe maʻemaʻe cellulose ma ke ʻano he mea maka, kahi etherified kūikawā ma lalo o nā kūlana alkaline.

ʻO ka synthesis o ka hydroxypropyl methylcellulose: mālama i ka pulupulu cellulose i hoʻomaʻemaʻe ʻia me ka lye ma 35-40 ° C no ka hapalua hola, e kaomi iā ia, e ʻoki i ka cellulose, a me ka makahiki pono ma 35 ° C e hana i ka awelika degere o ka polymerization o ka alkali i loaʻa. fiber i loko o ka laulā i makemake ʻia. E hoʻokomo i ka fiber alkali i loko o ka ipu etherification, e hoʻohui i ka propylene oxide a me ka methyl chloride i ke kaʻina, a etherify ma 50-80 ° C no 5 mau hola, ʻo ka nui o ke kaomi ma kahi o 1.8MPa. A laila e hoʻohui i ka nui kūpono o ka waika hydrochloric a me ka waikawa oxalic i ka wai wela ma 90 ° C e holoi i ka mea e hoʻonui ai i ka leo. Dehydrate i loko o kahi centrifuge. Holoi a hiki i ke kū ʻole, a i ka wā i emi ai ka wai i loko o ka mea ma lalo o 60%, e hoʻomaloʻo iā ia me kahi kahe ea wela ma 130 ° C i kahi maʻi ma lalo o 5%.

ʻO ka HPMC i hana ʻia e ke ʻano solvent e hoʻohana i ka toluene a me ka isopropanol e like me nā solvents. Inā ʻaʻole maikaʻi ka holoi ʻana, e ʻala ʻia ke koena. He pilikia kēia i ke kaʻina hana holoi, a ʻaʻole pili i ka hoʻohana ʻana a ʻaʻohe pilikia, akā i ka ʻoiaʻiʻo ʻO ka hydroxypropyl methylcellulose i hana ʻia e nā mea hana he nui ke ʻala ikaika a me ka ʻala. ʻAʻole i kūpono ka maikaʻi o kēia ʻano.

Hypromellose ua hoʻomaʻemaʻe pulupulu impregnated me ka loaʻaʻole wai e loaʻa alkaline cellulose, a laila, hoʻohui i ka solvent, etherification agent, toluene, a me ka isopropanol no ka etherification reaction, a loaa ka huahana pau ma hope o neutralization, holoi, maloʻo, a me ka wawahi. ʻAʻole maikaʻi, e pilau, no laila hiki i nā mea hoʻohana ke hoʻohana me ka hilinaʻi.