No hea te hydroxypropyl methylcellulose?

No hea te hydroxypropyl methylcellulose?

 

Ko te Hydroxypropyl Methyl Cellulose (HPMC), e mohiotia ana e te ingoa hokohoko hypromellose, he polymer waihanga i ahu mai i te cellulose taiao. Ko te puna tuatahi o te cellulose mo te hanga HPMC ko te nuinga o te rakau penupenu, te miro ranei. Ko te mahi whakangao ko te whakarereketanga matū i te cellulose na roto i te whakaea, te whakauru i nga roopu hydroxypropyl me te methyl ki runga i te tuara cellulose.

Ko te hanga o te HPMC he maha nga waahanga:

  1. Tangohanga Cellulose:
    • Ka riro mai te cellulose mai i nga puna tipu, te nuinga o te tupa rakau, te miro ranei. Ka tangohia te cellulose ka purea ki te hanga i te penupenu cellulose.
  2. Whakamaaka:
    • Ka tukuna te penupenu cellulose ki te wairewa kawakore, te nuinga o te konutai hauwai (NaOH), hei whakahohe i nga roopu hydroxyl i runga i te mekameka cellulose.
  3. Whakawera:
    • Ko te whakamaaramatanga te mahi matua mo te hanga HPMC. Ka tauhohehia te cellulose kawakore ki te propylene oxide (mo nga roopu hydroxypropyl) me te methyl chloride (mo nga roopu methyl) hei whakauru i enei roopu ether ki runga i te tuara cellulose.
  4. Te whakakore me te horoi:
    • Ko te hua o te cellulose whakarerekētia, ko Hydroxypropyl Methyl Cellulose ināianei, ka tukuna he tukanga whakakore hei tango i nga toenga kawakore. Katahi ka tino horoia hei whakakore i nga poke me nga hua-a-muri.
  5. Te whakamaroke me te mira:
    • Ka whakamarokehia te cellulose kua whakarereketia hei tango i te makuku, ka mira hei paura pai. Ko te rahi o te matūriki ka taea te whakahaere i runga i te tono e hiahiatia ana.

Ko te hua o te HPMC he paura ma, he ma-ma ranei me nga nekehanga rereke o te hydroxypropyl me te whakakapinga methyl. Ko nga ahuatanga motuhake o te HPMC, penei i te whakarewatanga, te viscosity, me etahi atu ahuatanga o te mahi, ka whakawhirinaki ki te tohu o te whakakapi me te mahi hangahanga.

He mea nui kia mahara ko te HPMC he polymer ahua-waiata, a ahakoa i ahu mai i te cellulose maori, he nui nga whakarereketanga matū i te wa o te mahi hangahanga kia tutuki ai ona taonga e hiahiatia ana mo nga momo tono ahumahi.


Te wa tuku: Hanuere-01-2024