Ko kunhuwa kwehydroxypropyl methylcellulose (HPMC) kunokanganisa sei kunaka?

Nzira yekuziva sei kunaka kwehydroxypropyl methylcellulose (HPMC) mubvunzo unonyanya kunetseka nevatengi uye shamwari. Nhasi, Xinhe Shanda Cellulose inopfupisa maitiro ekutonga kunaka kwehydroxypropyl methylcellulose (HPMC) Kutonga mhando yechigadzirwa:

Chekutanga pane zvese, isu tinofanirwa kunzwisisa maitiro ekugadzira ehydroxypropyl methylcellulose:

Hydroxypropyl methylcellulose, inozivikanwawo se hypromellose uyecellulose hydroxypropyl methyl ether, inogadzirwa nepamusoro yakachena yekotoni cellulose seyakagadzirwa, iyo inonyanya kugadzirwa etherified pasi pemamiriro ealkaline.

Iyo synthesis yehydroxypropyl methylcellulose: bata yakacheneswa donje cellulose nelye pa 35-40 ° C kwehafu yeawa, idzvanya, pwanya cellulose, uye ichembera zvakanaka pa 35 ° C kuita avhareji dhigirii yepolymerization yealkali yakawanikwa. fiber mukati mehuwandu hunodiwa. Isa iyo alkali fiber mu kettle ye etherification, wedzera propylene oxide uye methyl chloride munhevedzano, uye etherify pa50-80 ° C kwemaawa mashanu, iyo yakanyanya kudzvanywa inenge 1.8MPa. Wobva wawedzera huwandu hwakakodzera hwehydrochloric acid uye oxalic acid kumvura inopisa pa90 ° C kuti usuke zvinhu kuti uwedzere huwandu. Dehydrate mu centrifuge. Shambai kusvika pakusarerekera, uye kana mvura inenge iri muzvinhu yakaderera kupfuura 60%, iomese nemhepo inopisa inoyerera pa130 ° C kusvika kune zvishoma kudarika 5%.

Iyo HPMC inogadzirwa nenzira yekunyungudutsa inoshandisa toluene uye isopropanol sezvinonyungudutsa. Kana kugeza kusina kunaka, pachava nekamwe kakunhuhwirira kakasara. Iri idambudziko rekugeza, uye harina kukanganisa kushandiswa uye hapana dambudziko, asi chaizvoizvo Iyo hydroxypropyl methylcellulose inogadzirwa nevakawanda vanogadzira ine kunyanya kunhuhwirira kwakasimba uye kunhuhwirira kwakashata. Hunhu hwemhando iyi zvechokwadi hauna kusvika pachiyero.

Hypromellose inonatswa donje rakaiswa mumvura isingawanzo kuwana alkaline cellulose, wobva wawedzera solvent, etherification agent, toluene, uye isopropanol ye etherification reaction, uye uwane chigadzirwa chakapedzwa mushure mekusagadzikana, kugeza, kuomesa, uye kupwanya. Hazvina kunaka, zvinonhuhwirira, saka vashandisi vanogona kuzvishandisa nechivimbo.