Ko te cellulose ether he matū pūmua i hangaia mai i te cellulose tūturu mā te tukanga etherification, ā, he mea whakamātotoru me te pupuri wai pai rawa atu.
Papamuri Rangahau
Kua whānuitia te whakamahinga o ngā etera cellulose i roto i te moata maroke-ranu i ngā tau tata nei, ko ngā mea e whakamahia whānuitia ana ko ētahi etera cellulose kore-ionic, tae atu ki te methyl cellulose ether (MC), te hydroxyethyl cellulose ether (HEC), te hydroxyethyl cellulose ether Methyl cellulose ether (HEMC) me te hydroxypropyl methyl cellulose ether (HPMC). I tēnei wā, kāore i te maha ngā tuhinga mō te tikanga ine i te matotoru o te otinga cellulose ether. I tō tātou whenua, ko ētahi paerewa me ngā monograph anake e whakatau ana i te tikanga whakamātautau o te matotoru o te otinga cellulose ether.
Te tikanga whakarite o te otinga cellulose ether
Te Whakarite i te Otinga Methyl Cellulose Ether
Ko ngā etera methyl cellulose e pā ana ki ngā etera cellulose kei roto ngā rōpū methyl i roto i te ngota, pērā i te MC, HEMC me te HPMC. Nā te koretake o te rōpū methyl ki te wai, he āhuatanga whakawera wera ngā otinga etera cellulose kei roto ngā rōpū methyl, arā, kāore e wairewa i roto i te wai wera i te pāmahana teitei ake i tō rātou pāmahana whakawera (tata ki te 60-80°C). Hei ārai i te hanganga o ngā whakapūhui o te otinga etera cellulose, whakamahanahia te wai ki runga ake i tōna pāmahana gel, tata ki te 80~90°C, kātahi ka tāpirihia te paura etera cellulose ki roto i te wai wera, whakaohokia kia marara, me whakaoho tonu, ā, whakamatao kia tae ki te pāmahana kua whakaritea, ka taea te whakarite hei otinga etera cellulose ōrite.
Ngā āhuatanga wairewa o ngā etera kei roto i te methylcellulose kāore i tukatukahia ki te mata
Hei karo i te kohikohinga o te cellulose ether i te wā e whakarewahia ana, ka whakahaerehia e ngā kaihanga he maimoatanga mata matū ki runga i ngā hua paura cellulose ether hei whakaroa i te whakarewatanga. Ka puta tōna tukanga whakarewa i muri i te mararatanga katoa o te cellulose ether, kia taea ai te marara tika ki roto i te wai matao me te uara pH kūpapa me te kore e hanga i ngā mea e whakaemi ana. Ko te teitei ake o te uara pH o te otinga, ko te poto ake o te wā whakarewa o te cellulose ether me ngā āhuatanga whakarewatanga whakaroa. Whakatikatikahia te uara pH o te otinga ki te uara teitei ake. Ka whakakorea e te kawakore te wairewatanga whakaroa o te cellulose ether, ka meinga te cellulose ether kia hanga i ngā mea e whakaemi ana i te wā e whakarewahia ana. Nō reira, me whakanui ake, me whakaiti rānei te uara pH o te otinga i muri i te mararatanga katoa o te cellulose ether.
Ngā āhuatanga wairewa o ngā etera kei roto i te mata he methylcellulose
Te Whakarite i te Otinga Hydroxyethyl Cellulose Ether
Kāore he āhuatanga o te wairewa Hydroxyethyl Cellulose Ether (HEC) ki te whakawerawera, nō reira, ka hangaia hoki he whakapūhui i roto i te wai wera e te HEC, me te kore maimoatanga mata. Ko te tikanga, ka whakahaerehia e ngā kaihanga he maimoatanga mata matū ki runga i te paura HEC hei whakaroa i te whakarewatanga, kia taea ai te hora tika ki roto i te wai matao me te uara pH kūpapa me te kore e hanga he whakapūhui. Waihoki, i roto i te wairewa he nui te kawakore, ka taea hoki e te HEC te hanga i ngā whakapūhui nā te mea ka roa te ngaronga o te wairewa. Nā te mea he kawakore te paru sima i muri i te whakamakuku, ā, ko te uara pH o te wairewa kei waenga i te 12 me te 13, he tino tere hoki te tere whakarewa o te cellulose ether kua maimoatia ki te mata i roto i te paru sima.
Ngā āhuatanga wairewa o te HEC i tukatukahia ki te mata
Whakatau me te Tātari
1. Te tukanga marara
Hei karo i ngā pānga kino ki te wā whakamātautau nā te puhoi o te whakarewatanga o ngā matū maimoatanga mata, ka tūtohutia kia whakamahia te wai wera mō te whakarite.
2. Te tukanga whakamatao
Me whakaoho ngā otinga cellulose ether, ā, me whakamatao ki te pāmahana taiao hei whakaiti i te tere whakamatao, e hiahia ana kia roa ake ngā wā whakamātautau.
3. Te tukanga whakaoho
Kia mau tonu te whakaoho i muri i te tāpiritanga o te cellulose ether ki te wai wera. Ina heke te pāmahana o te wai i raro i te pāmahana o te gel, ka tīmata te memeha o te cellulose ether, ā, ka mātotoru haere te wai. I tēnei wā, me whakaiti te tere whakaoho. Kia tae te wai ki tētahi mātotoru, me tū tonu mō te neke atu i te 10 hāora i mua i te pupuhi haere o ngā mirumiru ki te mata, ka pakaru, ka ngaro.
Ngā Mirumiru Hau i roto i te Otinga Cellulose Ether
4. Te tukanga whakamakuku
Me ine tika te kounga o te cellulose ether me te wai, ā, kaua e tatari kia teitei ake te matotoru o te otinga i mua i te whakakī anō i te wai.
5. Whakamātautau matotoru
Nā te thixotropy o te otinga cellulose ether, i te wā e whakamātautauhia ana tōna matotoru, ina whakauruhia te rotor o te viscometer hurihuri ki roto i te otinga, ka whakakorikori i te otinga, ā, ka pā ki ngā hua ine. Nō reira, i muri i te whakaurunga o te rotor ki roto i te otinga, me waiho kia tū mō te 5 meneti i mua i te whakamātautau.
Wā tuku: Maehe-22-2023