Miro parakore—whakatuwhera—alkalization—etherification—neutralization—wehewehe—horoi—wehenga—maroke—te kuru—te whakakakahu—kua oti te whakatuwhera hua HPMC: Ka whakatuwherahia te miro parakore hei tango i te rino ka kuru. Ko te miro para parakore i te ahua o te paura, me te rahi o te matūriki o te 80 mata me te whakawhiti o te 100%. Ki te kore, he ngawari ki te whakakotahi tahi i te wa o te mahi tauhohenga me te whakaiti i te pai o te etherification.
Alkalization: Tāpirihia te paura miro para parakore i muri i te whakatuwheratanga o te miro ki te whakarewa mokowhiti, ka whakahohehia ki te wai kawakore me te wai ngohengohe ki te pupuhi i te kurupae o te miro para hei whakahaere i te urunga o nga ngota ngota kaihoko etherification me te whakapai ake i te rite o te tauhohenga etherification. Ko te kawakore e whakamahia ana mo te whakamaaramatanga he waikawa whakarewa, he kawakore waro ranei. Ko te nui o te kawakore kua tapirihia (ma te papatipu, he rite ki raro nei) he 0.1-0.6 nga wa o te miro para, ko te nui o te wai ngohengohe kua tapirihia he 0.3-1.0 nga wa o te miro para; he ranunga o te waipiro me te waiwaro te whakarewa mokowhiti, a ko te nui o te whakarewa mokowhiti ka tapiritia he 0.3-1.0 nga wa o te miro parakore. 7 -15 nga wa o tera: Ka taea ano e te whakarewa koretake 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 rauemi me nga whakaritenga hua.
Te whakamaarama: I muri i te maimoatanga o te whakamaaramatanga, i raro i nga tikanga korehau, ka taapirihia te kaihoko etherification mo te etherification, a ko te kaihoko etherification he propylene oxide. Hei whakaiti i te kohi o te kaihoko etherification, i roto i te tukanga etherification, e rua nga wa ka taapirihia te kaihoko etherification, ko te nui o te taapiri tuatahi ko te 1-3.5 nga wa o te miro parakore, a ko te tapeke o nga taapiri e rua he 1.5 -4 nga wa o te miro parakore. wā. I muri i te taapiri i te kaihoko whakamaarama mo te wa tuatahi, whakaohohia i te ≤30 ° C mo te 45min-90min, ka whakaara ake i te pāmahana ki te 50-100 ° C mo te etherification mo te 1-5h, ka whakamatao ki te ≤30 ° C, te wa tuarua ki te tāpiri i te etherification whakaoho, te wa whakakorikori he 30-120min, a ka wera ki? ? ? Whakahaerehia te whakamaaramatanga, ko te 1-4h te wa, i tenei wa, ka tino tauhohe te miro parakore ki te kaihoko whakaeera hei whakaputa hYDROXYPROPYL METHYLCELLULOSE HPMC.
Te kuru me te takai: te kuru me te tatari i te hua maroke o te hanga o naianei, ko te rahi matūriki o te hua HPMC o te tenenga o naianei i muri i te kuru me te tatari ko te 40 mesh me te whakawhiti he 10096, i runga ranei i nga hiahia o te kaiwhakamahi. Katahi ka kohia te HPMC.
Te wa tuku: Noema-24-2022