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Hydroxypropyl methyl cellulose HPMC kaʻina hana a me nā noi

ʻO ka Hydroxypropyl methyl cellulose HPMC, i kapa ʻia ʻo hydroxypromellose, he keʻokeʻo a keʻokeʻo cellulose ether pauka a i ʻole granule i loaʻa i ka wai anuanu a me ka wai wela e like me ka methyl cellulose.ʻO ka hui hydroxypropyl a me ka pūʻulu methyl he paʻa etera a me ke apo glucose anhydrous o cellulose i hui pū ʻia, he ʻano o ka non-ionic cellulose i hui ʻia eter.He semi-synthetic, inactive, viscoelastic polymer i hoʻohana mau ʻia ma ke ʻano he lubricant i ka ophthalmology, a i ʻole he excipient a excipient paha i nā lāʻau lapaʻau waha.

1. Ka hana hana

Kraft pulp me ka αcellulose maʻiʻo o 97%, intrinsic viscosity o 720mL / g a me ka awelika fiber lōʻihi o 2.6mm ua pulu i loko o 49% NaOH solution ma 40 ℃ no 50 kekona.A laila ua hoʻokuʻu ʻia ka pulp e wehe i ka hopena 49% NaOH e loaʻa ai ka cellulose alkali.ʻO ka lākiō kaumaha o (49% NaOH aqueous solution) i (mea paʻa o ka pulp) i ka pae impregnation he 200. ʻO ka lākiō kaumaha o NaOH i ka cellulose alkali a paʻa i ka pulp he 1.49.Hoʻokomo ʻia ka cellulose alkali i loaʻa (20kg) i loko o kahi reactor kaomi jacked me ka hoʻoulu ʻana i loko, a laila holoi ʻia a hoʻomaʻemaʻe ʻia me ka nitrogen e hoʻoneʻe pono i ka oxygen mai ka reactor.A laila, mālama ʻia ka mahana o ka reactor ma 60 ℃ i ka wā i hoʻokō ʻia ai ka hoʻoulu ʻana i loko.

A laila ua hoʻohui ʻia ka 2.4kg dME a ua mālama ʻia ka mahana o ka reactor i 60 ℃.Ma hope o ka hoʻohui ʻia ʻana o ka dimethyl ether, ua hoʻohui ʻia ka methylene chloride e hana i ka ratio molar o ka methylene chloride i ka NaOH i ka cellulose alkaline 1.3, ua hoʻohui ʻia ka propylene oxide e hana i ka ratio kaumaha o propylene oxide i paʻa i loko o ka pulp 1.97, a me ka mahana i loko o ka reactor. ua mālama ʻia mai 60 ℃ a 80 ℃.Ma hope o ka hoʻohui ʻana i ka chloromethane a me ka propylene oxide, ua mālama ʻia ka mahana o ka reactor mai 80 ℃ a 90 ℃.Eia kekahi, ua mau ka hopena no 20 mau minuke ma 90 ℃.

Hoʻokahe ʻia ke kinoea mai ka reactor a hoʻoneʻe ʻia ka crude hydroxypropyl methyl cellulose mai ka reactor.He 62 ℃ ka mahana o ka hydroxypropyl methyl cellulose.E ana i ka huina 50% ka nui o ka nui ma ka puunaue kumulative ma muli o ke kaumaha ma muli o ka ratio o ka hydroxypropyl methyl cellulose crude ma o na puka o na sieving elima, he okoa ko kela mea keia mea.

ʻO ka hopena, ʻo 6.2mm ka nui o ka nui o nā ʻāpana koʻikoʻi.Ua hoʻokomo ʻia ka crude hydroxypropyl methyl cellulose i loko o kahi kneader biaxial mau loa (KRC kneader S1, L / D = 10.2, ka nui o loko 0.12 L, ka wikiwiki o ka rotation 150rpm) ma ka wikiwiki o 10kg / hr, a ua loaʻa ka decomposed crude hydroxypropyl methyl cellulose.ʻO ka hopena o nā ana like me ka hoʻohana ʻana i nā pale 5 me nā ʻano wehe like ʻole, ʻo 1.4mm ka awelika o ka nui o nā ʻāpana.Hoʻohui i 80 ℃ wai wela i ka decomposed crude hydroxypropyl methyl cellulose i loko o ka pahu me ka mālama ʻana i ka mahana o ka lole.ka nui o ka ratio kaumaha o ka decomposed crude hydroxypropyl methyl cellulose i ka huina o ka slurry he 0.1, a ua loaa ka slurry.Hoʻoulu ʻia ka slurry ma kahi mahana mau o 80 ℃ no 60 mau minuke.

A laila, hāʻawi ʻia ka slurry i ka wikiwiki o ka huli ʻana o 0.5 RPM a me ka kānana kaomi rotary pre-heated (nā huahana BHS Sonthofen).ʻO ka mahana o ka grout he 93 ℃.E hoʻohana i ka paila no ka hoʻolako ʻana i ka slurry, ʻo ke kaomi hoʻokuʻu ʻana he 0.2mpa.ʻO 80μm ka nui o ka wehe ʻana o ka kānana kaomi rotary, a ʻo ka wahi kānana he 0.12m2.Hoʻopili ʻia ka slurry i hāʻawi ʻia i ka kānana kaomi rotary ma o ka kānana a hoʻololi ʻia i keke kānana.Hāʻawi ʻia ka keke kānana hopena me ka mahu 0.3mpa a me ka wai wela 95 ℃ me ka ratio paona o 10.0 i ka mea paʻa o ka HYDROXYpropyl methyl cellulose i holoi ʻia, a laila kānana ʻia ma o kahi kānana.

Hāʻawi ʻia ka wai wela ma o ka pauma ma kahi kaomi hoʻokuʻu o 0.2mpa.Ma hope o ka hoʻolako ʻia ʻana o ka wai wela, hāʻawi ʻia ka mahu 0.3mpa.A laila, ma hope o ka holoi ʻana, wehe ʻia nā huahana mai ka ʻili kānana e kahi ʻōpala a hoʻokuʻu ʻia i waho o ka mīkini holoi.Hoʻomau ʻia nā ʻanuʻu mai ka hāʻawi ʻana i ka slurry i ka hoʻokuʻu ʻana i nā huahana holoi ʻia.E like me ke ana ʻana me ka hoʻohana ʻana i kahi hygrometer maloʻo wela, ʻo 52.8% ka nui o ka wai o ka huahana holoi ʻia i hoʻokuʻu ʻia.ʻO nā huahana i holoi ʻia i hoʻokuʻu ʻia mai ka kānana kaomi rotary ua hoʻomaloʻo ʻia e kahi mea maloʻo ea ma 80 ℃, a ʻoki ʻia i ka wili lanakila e loaʻa ai ka hydroxypropyl methyl cellulose.

2.Application

Hoʻohana ʻia ka huahana HPMC e like me ka mānoanoa, dispersant, binder, emulsifier a me ka stabilizer i ka ʻoihana textile.Hoʻohana nui ʻia i ka resin synthetic, petrochemical, ceramic, pepa, ʻili, lāʻau lapaʻau, meaʻai, nā mea hoʻonaninani a me nā ʻoihana ʻē aʻe.


Ka manawa hoʻouna: Mar-23-2022