Te Waikawa Waikawa Metilururo (HPMC)He etera cellulose kore-ionic e whakamahia whānuitia ana, e whakamahia whānuitia ana i roto i ngā rauemi hanga, rongoā, kai, paninga, me ētahi atu mara. Ko tōna pumau mahi me te kounga e pā tika ana ki te hua o te hua whakamutunga; nō reira, he mea nui te whakamātautau pūnaha o te HPMC i te wā whakaputa me te tono.
1. Te Āhua me te Whakamātautau Āhua Taketake
I mua i te whakamātautau, ka tirohia tuatahitia te tauira. Ko te HPMC kounga teitei me waiho hei paura mā, he mā-parauri rānei, he pai te rere, kāore he puranga, he kakara, he poke rānei. Me mārama, me paku pōuri rānei te wairewa, kāore he mea e iri ana. Muri iho, ka whakatauhia te nui o te makuku, mā te whakamahi i te tātari makuku infrared, i te tikanga whakamaroke rānei (tikanga taumaha pumau 105℃). Ko ngā hua whai mana he iti iho i te 5% te nui o te makuku.
Ko te whakatau i te nui o te pungarehu e whakaata ana i te nui o te paru kore-waro. Ka tahuna te tauira ki roto i te oumu whakakā i te 550℃ kia pumau te taumaha. Ko te tikanga, kaua e neke ake i te 1.5% te nui o te pungarehu. Ka pā te nui o te pungarehu ki te māramatanga me te pumau o te wairewa.
2. Whakamātautau Matotoru
Ko te matotorutanga tētahi o ngā tohu mahi tino nui o te HPMC, e whakatau tika ana i tōna matotorutanga, tōna pupuri wai, me ōna pānga hanga kiriata. Ko te whakamātautau ka mahia mā te whakamahi i tētahi mita matotoru hurihuri (pēnei i te mita matotoru Brookfield) i tētahi mita matotoru capillary Ubbelohde rānei.
I te wā whakamātautau, ka whakamatautauria he kukū motuhake (te nuinga o te 2%) o te wai HPMC i tētahi pāmahana kua tohua (te nuinga o te 20 ± 0.1℃). He rerekē rawa ngā awhe matotoru o ngā momo HPMC, pērā i te 400, 15000, me te 100000 mPa·s. Me rite te matotoru ine ki te awhe paerewa hua; ki te kore, ka tohu he kore pumau tōna taumata o te polymerization, o te whakakapinga rānei.
3. Te Whakamātautau i te Taumata Whakakapinga (Te Ihirangi Methoxy me te Hydroxypropoxy)
Ko te mahi a te HPMC ka tino whakatauhia e te nui o ngā matū whakakapi.
Ka pā te ihirangi methoxy (–OCH₃) ki te wairewatanga, te pāmahana tiēre, me te mahi mata;
Ka pā te nui o te hydroxypropoxy (–OCH₂CHOHCH₃) ki te ngāwari me te pupuri wai.
Ko ngā tikanga whakatau he tikanga e whakamahi ana i te titration matū, i te chromatography hau rānei. Hei tauira, i muri i te hydrolysis waikawa, ka puta mai ngā waipiro e rite ana i te tauira, kātahi ka tātarihia i runga i te rahinga mā te titration, te chromatography rānei. Ko ngā hua HPMC whai mana he tikanga kei roto ko te 19%–24% o te ihirangi methoxyl me te 4%–12% o te ihirangi hydroxypropoxyl.
4. Ine i te pāmahana o te gel
Ko ngā āhuatanga whakamahana o te HPMC tētahi tawhā matua e wehewehe ana i a ia mai i ētahi atu etera cellulose. I te wā whakamātautau, ka whakamahanahia mārire te wai HPMC, ka whakaohokia, ā, ko te pāmahana e huri ai te wai mai i te mārama ki te pōuri ka tuhia hei pāmahana tiēre.
Ko te tikanga, he iti ake te pāmahana o te HPMC he nui ake te ihirangi methoxyl, engari he nui ake te pāmahana o te gel ina nui ake te ihirangi hydroxypropoxyl. E pā ana tēnei tohu ki te pumau o te hua i roto i ngā tono pēnei i te moata hanga me te paninga papa.
5. Te Uara pH me te Whakamātautau Wairewa
I muri i te whakarite i tētahi otinga HPMC 2%, ka inehia tōna pH mā te whakamahi i tētahi mita pH. Ko te awhe noa ko te 5.0–8.0. I roto i tēnei awhe, he pumau te HPMC, ā, kāore e tauhohe kino ki te nuinga o ngā rauemi kore-waro, ngā tāpiringa rānei.
Ka aromatawaihia e te whakamātautau wairewa tōna horapa me te tere whakarewa i roto i te wai matao. Me horapa tere te HPMC kounga teitei i raro i te whakaoho, kia puta ai he otinga ōrite, mārama hoki i roto i te 30 meneti.
6. Te Kite i te Parakore me te Parakore
Ko te kimi parakore ko ngā whakamātautau matua mō ngā konganuku taumaha, ngā pūhaumāota, ngā whanariki, me ngā rohe moroiti.
Ko te nui o te konganuku taumaha (hei Pb) kaua e neke ake i te 20 ppm; te konupora ≤ 0.2%, te konupora whanariki ≤ 0.5%;
Mō ngā whakamahinga rongoā, kai rānei, me whakamātau hoki te tapeke o ngā huakita, ngā huakita koriform, me te tapeke o te harore/rewhare kia pai ai te haumaru.
7. Tātaritanga Thermogravimetric me te Fourier Transform Infrared Spectroscopy
Hei aromatawai anō i te hanganga me te pumau wera o te HPMC, ka taea te whakamahi i te tātaritanga wera-rahi (TGA) me te inenga infrared Fourier transform (FTIR).
Ka taea e TGA te kite i te panoni papatipu o te HPMC i ngā pāmahana rerekē, ā, mā reira ka whakatauhia te pāmahana pirau wera me te awhe pumau;
Ka tātarihia e te FTIR te hanganga rōpū mahi mā roto i ngā tihi mimiti, hei manatoko i te aroaro o ngā roopu mimiti āhuatanga –OH, –OCH₃, me te –OCH₂CHOHCH₃ hei whakaū i te tika o te hanganga ngota.
Mā te whakamātautau pūnaha kua whakahuatia ake nei ka taea te aromatawai whānui i ngā āhuatanga ā-tinana me te pai o te whakamahinga o te HPMC. Ko te matotoru, te nui o te whakakapinga, me te ihirangi makuku ngā tohu matua o te whakahaere kounga; ko te pH, te ihirangi pungarehu, me te pāmahana whakakī e whakaata ana i ōna taumata tukatuka me te parakore. Ko te piripono ki ēnei tikanga whakamātautau ehara i te mea ka whakarite noa i te pumau o te hua me te rite o te mahi engari ka whakarato hoki i te tautoko raraunga pono mō te haumaru me tete whakamahinga whai hua o te HPMCi roto i ngā ahumahi pēnei i te hangahanga, te rongoā, me te kai.
Wā tuku: Oketopa-31-2025