Ko te tikanga, i roto i te whakahiato ohydroxypropyl methylcellulose, Ko te miro cellulose kua oti te rongoa ki te wairewa alkali i te 35-40°C mo te hawhe haora, ka ruia, ka kohia te cellulose, ka tika te pakeke ki te 35°C, na ko nga muka kawakore i whiwhi he tohu polymerized toharite kei roto i te waahanga e hiahiatia ana. awhe. Kuhua te muka kawakore ki roto i te ketere whakamaarama, taapirihia te propylene oxide me te methyl chloride, ka whakamaarama i te 50-80 ℃ mo te 5 haora ki te pehanga teitei o te 1.8 MPa. Kātahi ka tāpirihia te nui o te waikawa pūhaumāota me te waikawa oxalic ki te wai wera i te 90 ° C hei horoi i te rauemi kia nui ake te rōrahi. Whakakore wai ki te centrifuge. Horoi kia kore noa, ka iti iho i te 60% te nui o te wai i roto i te rauemi, whakamaroke ki te rere o te hau wera i te 130°C ki te iti iho i te 5%.
Alkalization: Ko te paura miro parakore i muri i te whakatuwheratanga ka whakauruhia ki roto i te whakarewa korekore, ka whakahohehia ki te wai kawakore me te wai ngohengohe ki te pupuhi i te kurupae karaihe o te miro para, e pai ana ki te kuhu o nga ngota ngota kaihoko etherifying me te whakapai ake i te riterite o te tauhohenga etherification. . Ko te kawakore e whakamahia ana i roto i te whakamaaramatanga he waiwai whakarewa, he turanga waro ranei. Ko te nui o te kawakore ka tapirihia (ma te papatipu, he rite ki raro nei) he 0.1-0.6 nga wa o te miro para, a ko te nui o te wai ngohengohe he 0.3-1.0 nga wa o te miro para; Ko te whakarewa mokowhiti he ranunga o te waipiro me te waiwaro, a ko te nui o te whakarewa mokowhiti ka tapiritia he miro para. 7-15 nga wa: ka taea ano e te whakarewa mokowhiti te waipiro me te 3-5 ngota waro (penei i te waipiro, propanol), acetone. Ka taea hoki te hauwai aliphatic me te hauwai kakara; kia whakahaeretia te pāmahana i roto i te 0-35°C i te wa o te whakamaaramatanga; Ko te wa whakamaarama he 1 haora. Ko te whakarereketanga o te pāmahana me te wa ka taea te whakatau kia rite ki nga whakaritenga o te rauemi me te hua.
Te whakamaarama: I muri i te maimoatanga o te whakamaaramatanga, i raro i nga tikanga korehau, ka mahia te whakamaaramatanga ma te taapiri i tetahi kaihoko etherifying, a ko te kaihoko whakakoi he propylene oxide. Hei whakaiti i te kohi o te kaikawe, ka rua nga wa i taapirihia ai te kaitao i roto i te waa o te mahi.
Te wa tuku: Apr-28-2024