Tukatuka rere o te hydroxypropyl methylcellulose

Hydroxypropyl methylcellulose (HPMC)he wai-wairewa cellulose pärönaki whakamahia nuitia i roto i te hanga, paninga, rongoā, kai me te poke. He tino uaua tona tukanga whakaputa, he maha nga waahanga, tae atu ki te whakakore, te tauhohenga, te horoi, te whakamaroke me te kuru o te cellulose.

1. Te whakarite rauemi mata

Ko te hanga o te hydroxypropyl methylcellulose ka whakamahia nga tipu penei i te rakau, te miro ranei hei rauemi mata. Tuatahi, me tango te cellulose mai i te tipu. Ko te cellulose kua tangohia i te nuinga o te waa ka whakahekehia, ka whakapoipohia, ka whakakorehia te poke-ki te whiwhi rauemi mata parakore o te cellulose.

2. Te whakakorenga o te cellulose

He iti te wairewa o te Cellulose i roto i te wai, na reira me whakakoha ma te whakarewa i te wa o te mahi whakaputa. Ko nga whakarewa noa he ranunga o te haukinia pūhaumāota me te wai, he ranunga haukini me te waihā. Tuatahi, ka konatunatuahia te cellulose parakore ki te whakarewa me te rongoa i te wera nui kia taea ai te rewa katoa te cellulose.

3. Tauhohenga methylation

He kaihoko methylating (pēnei i te methyl chloride me te methyl chloride) ka taapirihia ki te cellulose memeha mo te tauhohenga methylation. Ko te kaupapa matua o tenei tauhohenga he whakauru i nga roopu methyl (–OCH₃) ki te hanga methyl cellulose. Ko te tikanga me whakahaere tenei mahi i roto i te taiao kawakore, a, ko te mana o te pāmahana tauhohenga me te wa ka whai mana nui ki te hanganga ngota me te mahi o te hua whakamutunga.

4. Tauhohenga Hydroxypropylation

Ka tauhohe ano te cellulose methylated ki nga acrylates (pēnei i te allyl chloride) ki te whakauru i nga roopu hydroxypropyl (–OCH₂CH₃). I te nuinga o te wa ka mahia tenei tauhohenga i roto i te otinga kawakore, a ko te mana o te pāmahana tauhohenga me te wa tauhohenga ka whakatau i te ihirangi hydroxypropyl o te hua. Ko te tohu o te hydroxypropylation e pa tika ana ki te whakarewatanga, te pokey me etahi atu ahuatanga tinana me te matū o HPMC.

5. Te whakakore me te horoi

I muri i te otinga o te tauhohenga, ka noho tonu etahi matū kawakore me nga reagents matū kaore ano kia aro ki roto i te punaha. Na reira, he mea tika ki te tango i te taikaha matū kawakore i roto i te maimoatanga neutralization. I te nuinga o te wa ka mahia te whakakore me te waikawa (pērā i te waikawa acetic, waikawa pūhaumāota rānei), ka puta he tote kūpapa i muri i te tauhohenga waikawa-papa. I muri mai, ka tangohia nga poke i roto i te otinga e te maha o nga horoinga hei whakarite i te ma o te hua.

6. Te matewai me te whakamaroke

Ko te otinga cellulose kua horoia me whakamakuku, ka whakamahia te whakaetonga, te ultrafiltration ranei hei tango i te wai. Ko te whakatārewatanga o te cellulose kua maroke he nui te kukū o te mea maroke, katahi ka uru ki te tukanga whakamaroke. Ko te tikanga whakamaroke ka taea te whakamaroke rehu, te whakamaroke korehau, te whakamaroke hau wera ranei. He mea nui te whakahaere i te pāmahana i te wa o te whakamaroke. Ko te tiketike rawa o te pāmahana ka paheke te hua, ka ngaro ranei te mahi e tumanakohia ana.

7. Te kuru me te tatari

Ko te hydroxypropyl methylcellulose maroke kei roto i te ahua paura, me kuru me te tatari ki te whakahaere i te rahi matūriki hua i roto i tetahi awhe. Ka taea e te tukanga tatari te whakarite i te rite o te hua me te tango i nga poke me nga matūriki nui ake.

8. Te takai me te rokiroki

Ko te hua o te hydroxypropyl methylcellulose ka taea te whakaputa i roto i nga momo putea rereke e ai ki nga hiahia o nga kaihoko, penei i nga peeke, nga oko, me etahi atu. Me penapena te hua kua oti te takai ki roto i te waahi maroke me te hauhautanga kia kore ai e nui te pāmahana me te makuku.

9. Mana kounga

Me kaha te whakahaere kounga i nga hononga katoa i roto i te mahi whakaputa kia tutuki ai te hua whakamutunga ki nga paerewa. Ko nga mea whakamatautau noa ko: te whakarewatanga, te pokey, te uara pH, te poke me te makuku. Ko nga ahuatanga o te hua ka pa tika ki tana paanga ki nga waahi tono rereke, na reira ko te mana kounga he hononga matua ki te hanga o te hydroxypropyl methylcellulose.

Ko te tukanga whakaputa ohydroxypropyl methylcellulosehe maha nga tauhohenga matū me nga waahanga maimoatanga tinana, he nui nga whakaritenga mo nga tikanga tukanga. Ko te pāmahana tauhohenga, te wa, te uara pH me etahi atu mea me tino whakahaere i roto i te whakaputanga kia whiwhi hua pai te mahi. Na te ahunga whakamua o te aoiao me te hangarau me te whakawhanaketanga o te hangarau whakaputa, kei te pai haere tonu te mahi whakaputa o HPMC, kei te piki haere hoki te mara tono o te hua.