Njira yoyenda ya hydroxypropyll methylcellulose

Hydroxypropyl methylcellulose (hpmc)amagwiritsidwa ntchito kawirikawiri pa cellulose, zomwe zimagwiritsidwa ntchito kwambiri pomanga, zopangira, mankhwala opangira mankhwala, chakudya ndi zodzola. Njira zake zopanga ndizovuta kwambiri ndipo zimaphatikizapo masitepe angapo, makamaka kuphatikiza, zomwe zimachitika, kuchapa, kuyanika ndi kuphwanya cellulose.

1. Kukonzekera kwa zinthu

Kupanga kwa hydroxypropyl methylcellulose kumagwiritsa ntchito mbewu monga nkhuni kapena thonje ngati zida zophika. Choyamba, cellulose ayenera kuchotsedwa ku mbewuyo. Cellulose yochotsedwa imatha, imaphiphiritsa, komanso kudetsedwa, kuchotsedwa kuti ipeze ma cellulose a celluse.

2. Kuwonongeka kwa cellulose

Cellulose ali ndi malo osauka m'madzi, chifukwa chake amafunika kusungunuka ndi kukhululuka nthawi yopanga. Ma sol solmon ndi osakaniza ammonium chloride ndi madzi, kapena chisakanizo cha ammonia ndi ethanol. Choyamba, cellulose yoyera imasakanikirana ndi zosungunulira ndikuwachitira kutentha kwambiri kuti mutsimikizire kuti cellulose itha kusungunuka kwathunthu.

3.. Methylation

Wothandizila (monga methyl chloride kapena methyl chloride) amawonjezeredwa pa cellulosed cellose pofuna kuti pa metyation. Cholinga chachikulu cha izi ndikuyambitsa methl magulu (-Och₃) kupanga methyl cellulose. Izi nthawi zambiri zimafunikira kuchitika m'malo achifupi a alkaline, ndipo kuchuluka kwa kutentha ndi nthawi kumakhala kofunikira pazinthu zomaliza ndi zomwe zimachitika.

4. Hydroxypypypy

Chuma cha methylated celloul okhudzana ndi ma acrylates (monga allyl chloride) kukhazikitsa magulu a hydroxypyl (-Och₂ch₃). Izi nthawi zambiri zimachitika mu yankho la alkaline, ndipo kuwongolera kutentha kwa machitidwe ndi momwe mukuchitira nthawi amasankha ma hydroxypyl omwe ali ndi malonda. Mlingo wa hydroxypropropropropropy imakhudza kusungunuka, mafakisoni ndi mitundu ina yathupi ndi mankhwala a HPMC.

5. Kusambirana ndi kuchapa

Pambuyo pa zomwe zimachitika, zinthu zina zamchere kapena mankhwala osaneneka zimatha kukhalabe m'dongosolo. Chifukwa chake, ndikofunikira kuchotsa zinthu zochulukirapo za alkalines kudzera chithandizo cha kusachitatsa. Kulowererapo nthawi zambiri kumachitika ndi asidi (monga acetic acid kapena hydrochloric acid), ndipo mchere wopanda pake udzapangidwa pambuyo pa acid. Pambuyo pake, zodetsa mu yankho zimachotsedwa ndi kusamba kambiri kuonetsetsa kuti malonda.

6. Mafuta ndi kuyanika

Kusintha kwa cellulose kuyenera kukhala kotopetsa, ndipo kusinthasintha kapena ultraffistration nthawi zambiri kumagwiritsidwa ntchito pochotsa madzi. Kuyimitsa kwa cellose kumalima owuma kwambiri, kenako kumalowamo kupukuta. Njira yowuma imatha kuyanika, kuyanika kwa vacuum kapena kuyanika kwa mpweya. Kuwongolera kutentha panthawi youma ndikofunikira kwambiri. Kutentha kwambiri kumatha kuyambitsa chinthucho kuti chiwononge kapena kutaya.

7. Kuphwanya ndi kudekha

Ma hydroxypropyll methylcellulose ali mu mawonekedwe a ufa ndipo akufunika kuphwanyidwa ndikuyipitsidwa kuti aziwongolera kukula kwa tinthu tambiri. Njira yoyeserayo imatha kuonetsetsa kuti mafayilo azogulitsa ndi kuchotsa zodetsa ndi tinthu tating'onoting'ono.

8. Kusunga ndi Kusunga

Chifukwa cha hydroxypropyl methylcellulose amatha kupanga mitundu yosiyanasiyana malinga ndi zosowa za kasitomala, monga zikwama, mbiya, ndi zina mwapadera kuti muchepetse chinyezi komanso kusokoneza magwiridwe ake. Zogulitsa zoyikidwa ziyenera kusungidwa m'malo owuma komanso ozizira kuti musamatenthe bwino komanso chinyezi.

9. Kuwongolera

Kuwongolera Khalidwe Lokhazikika kumafunikira pa ulalo uliwonse pakupanga njira yopangira kuti muwonetsetse kuti chinthu chomaliza chimakwaniritsa miyezoyo. Zinthu zoyeserera zofala zimaphatikizapo: kusandulika, mafayilo, mtengo wamtengo wapatali, chidetso chodekha ndi chinyezi. Zomwe zimapangidwa mwachindunji zimakhudza kwambiri magawo osiyanasiyana ogwiritsa ntchito, kotero kuwongolera kwapadera ndi ulalo wofunikira popanga hydroxpyulose.

Kupanga kwahydroxypypyl methylcelluloseZimaphatikizapo kusintha kwamankhwala angapo ndi njira zochizira matenda, ndipo zimakhala ndi zofunikira pakukonzekera. Kutentha Kutentha, nthawi, nthawi ya PH ndi zinthu zina ziyenera kulamulidwa mosamalitsa kupeza zinthu zomwe zili ndi magwiridwe antchito abwino. Popita patsogolo kwa sayansi ndi ukadaulo ndi chitukuko chaumisiri yopanga, njira zopangira hpmc zikuwongolera, ndipo gawo la ntchitoyo likukulanso.