ʻO ka Hydroxypropyl methylcellulose (Hypromellose), i kapa ʻia ʻo hypromellose, he keʻokeʻo keʻokeʻo cellulose pauka a i ʻole granule, nona nā ʻano o ka hiki ke hoʻoheheʻe ʻia i ka wai anuanu a hiki ʻole ke hoʻoheheʻe ʻia i ka wai wela e like me ka methyl cellulose.Hoʻohui ʻia ka hui hydroxypropyl a me ka hui methyl me ke apo glucose anhydrous o ka cellulose e ka paʻa ether, ʻo ia ke ʻano o ka non-ionic cellulose i hui pū ʻia.He semisynthetic, inactive, viscoelastic polymer i hoʻohana mau ʻia ma ke ʻano he lubricant i ka ophthalmology, a i ʻole he excipient a i ʻole kaʻa i nā lāʻau lapaʻau waha.
hoomakaukau ana
ʻO ka pulp pulp o ka pulp pepa kraft i loaʻa mai ka lāʻau pine me ka alpha cellulose content o 97%, he viscosity intrinsic o 720 ml / g, a me ka lōʻihi o ka fiber he 2.6 mm i hoʻokomo ʻia i loko o kahi 49% NaOH aqueous solution ma 40 ° C 50 kekona;ʻO ka pulp ka hopena ua ʻomi ʻia e wehe i ka 49% aqueous NaOH no ka loaʻa ʻana o ka cellulose alkali.ʻO ka lakio paona o (49% NaOH aqueous solution) i (maʻiʻo paʻa i loko o ka pulp) i ka pae impregnation he 200. ʻO ka ratio kaumaha o (ka maʻiʻo NaOH i loko o ka cellulose alkali i loaʻa mai) a me (ka maʻiʻo paʻa i loko o ka pulp) 1.49.Hoʻokomo ʻia ka cellulose alkali i loaʻa (20 kg) i loko o kahi reactor kaomi ʻaʻahu me ka hoʻoulu ʻana i loko, a laila hoʻoneʻe ʻia a hoʻomaʻemaʻe ʻia me ka nitrogen e wehe pono i ka oxygen mai ka reactor.A laila, hana ʻia ka hoʻoulu ʻana i loko i ka wā e hoʻomalu ana i ka mahana o ka reactor i 60 ° C.A laila, hoʻohui ʻia he 2.4 kg o dimethyl ether, a mālama ʻia ka mahana o ka reactor e mālama ʻia ma 60°C.Ma hope o ka hoʻohui ʻana i ka dimethyl ether, e hoʻohui i ka dichloromethane i 1.3 ka ratio molar o (dichloromethane) a (NaOH i loko o ka cellulose alkaline), a hoʻohui i ka propylene oxide e hana (propylene oxide) a me (i loko o ka pulp) ʻO ka lākiō kaumaha o ka mea paʻa. ua hoʻololi ʻia i 1.97, ʻoiai ua hoʻomalu ʻia ka mahana o ka reactor mai 60 ° C a i 80 ° C.Ma hope o ka hoʻohui ʻana o ka methyl chloride a me ka propylene oxide, ua hoʻomalu ʻia ka mahana o ka reactor mai 80 ° C a 90 ° C.Eia kekahi, ua hoʻomau ʻia ka hopena ma 90 ° C no 20 mau minuke.A laila, hoʻokuʻu ʻia ke kinoea mai ka reactor, a laila lawe ʻia ka hydroxypropyl methylcellulose crude mai ka reactor.ʻO ka mahana o ka hydroxypropyl methylcellulose crude i ka manawa o ka lawe ʻana i waho he 62 degere C.Ua ana 'ia ka huila 50% nui ma ka puunaue nui ma muli o ke kaumaha kumulative i ho'oholo 'ia ma muli o ka ratio o ka crude hydroxypropyl methylcellulose e hele ana ma na puka o elima sieves, ua ana 'ia kela kanana.ʻO ka hopena, ʻo 6.2 mm ka nui o ka nui o nā ʻāpana koʻikoʻi.Ua hoʻokomo ʻia ka crude hydroxypropyl methylcellulose i loko o kahi kneader biaxial mau (KRC kneader S1, L / D = 10.2, ka nui o loko 0.12 lita, ka wikiwiki o ka rotational 150 rpm) ma kahi o 10 kg / hr, a loaʻa ka decomposition.o ka crude hydroxypropyl methylcellulose.He 1.4 mm ka awelika o ka nui o ka ʻāpana i ana like me ka hoʻohana ʻana i nā kānana o 5 mau puka wehe ʻokoʻa.I ka decomposed crude hydroxypropyl methylcellulose i loko o ka pahu me ka ʻaʻahu hoʻomalu wela, e hoʻohui i ka wai wela ma 80 ° C i ka nui e like me ( Ka lākiō kaumaha o ka nui o ka cellulose) i (ka huina o ka slurry) ua hoʻololi ʻia i 0.1, a ua loaa he slurry.Hoʻoulu ʻia ka slurry ma kahi mahana mau o 80 ° C no 60 mau minuke.A laila, ua hānai ʻia ka slurry i loko o kahi kānana kaomi rotary preheated (huahana o BHS-Sonthofen) me ka wikiwiki o ka huli ʻana o 0.5 rpm.ʻO ka mahana o ka slurry he 93 ° C.Hāʻawi ʻia ka slurry me ka hoʻohana ʻana i kahi pamu, a ʻo ke kaomi hoʻokuʻu ʻana o ka pamu he 0.2 MPa.ʻO ka nui o ka wehe ʻana o ka kānana o ka kānana kaomi rotary he 80 μm, a ʻo ka wahi kānana he 0.12 m 2.Hoʻololi ʻia ka slurry i hāʻawi ʻia i ka kānana kaomi rotary i kahi keke kānana e ka kānana kānana.Ma hope o ka hāʻawi ʻana i ka mahu o 0.3 MPa i ka keke i loaʻa, ua hoʻolako ʻia ka wai wela ma 95 ° C i ka nui o ka ratio kaumaha o (wai wela) i (maʻiʻo paʻa o ka hydroxypropyl methylcellulose ma hope o ka holoi ʻana) he 10.0, A laila, kānana ma o ka kānana.Hāʻawi ʻia ka wai wela e kahi pamu ma kahi kaomi hoʻokuʻu o 0.2 MPa.Ma hope o ka hoʻolako ʻia ʻana o ka wai wela, ua hoʻolako ʻia ka mahu o 0.3 MPa.A laila, hoʻoneʻe ʻia ka huahana i holoi ʻia ma ka ʻili kānana e kahi ʻōpala a hoʻokuʻu ʻia i waho o ka mīkini holoi.ʻO nā ʻanuʻu mai ka hānai ʻana i ka slurry a hiki i ka hoʻokuʻu ʻana i ka huahana holoi ʻia e hana mau ʻia.Ma muli o ke ana ʻana me ka hoʻohana ʻana i kahi hygrometer ʻano hoʻomaloʻo wela, ʻo 52.8% ka nui o ka wai o ka mea holoi holoi.Ua hoʻomaloʻo ʻia ka huahana i holoi ʻia i hoʻokuʻu ʻia mai ka kānana puʻe rotary me ka hoʻohana ʻana i kahi mea maloʻo ea ma 80 ° C., a pulverized i loko o ka mīkini hopena Victory mill e loaʻa ai ka hydroxypropyl methylcellulose.
palapala noi
Hoʻohana ʻia kēia huahana e like me ka thickener, dispersant, binder, emulsifier a me ka stabilizer i ka ʻoihana textile.Hoʻohana nui ʻia ia i ka resin synthetic, petrochemical, ceramics, pepa, ʻili, lāʻau lapaʻau, meaʻai, mea hoʻonaninani a me nā ʻoihana ʻē aʻe.
Ka manawa hoʻouna: Nov-15-2022