Ko te cellulose ether he pūmua hangai i hangaia mai i te cellulose tūturu mā te whakarerekētanga matū. Ko te cellulose ether he mea ahu mai i te cellulose tūturu. He rerekē te hanga o te cellulose ether i ngā pūmua hangai. Ko tōna rauemi taketake ko te cellulose, he matū pūmua tūturu. Nā te āhua motuhake o te hanganga cellulose tūturu, kāore e taea e te cellulose tonu te tauhohe ki ngā kaihoko etherification. Heoi, i muri i te maimoatanga o te kaihoko pupuhi, ka whakangaromia ngā here hauwai kaha i waenga i ngā mekameka ngota me ngā mekameka, ā, ko te tukunga kaha o te rōpū hydroxyl ka huri hei cellulose alkali tauhohe. Whiwhi cellulose ether.
I roto i te moata kua rite te ranunga, he iti rawa te nui o te cellulose ether e tāpirihia ana, engari ka taea e ia te whakapai ake i te mahi a te moata mākū, ā, koia te tāpiri matua e pā ana ki te mahi hanga o te moata. Mā te whiriwhiri tika i ngā cellulose ether o ngā momo rerekē, ngā matotoru rerekē, ngā rahi matūriki rerekē, ngā nekehanga matotoru rerekē me ngā nui tāpiri ka pā pai ki te whakapai ake i te mahi a te moata paura maroke. I tēnei wā, he maha ngā moata pereki me te parai he ngoikore te mahi pupuri wai, ā, ka wehea te paru wai i muri i ētahi meneti o te tūnga.
He mahi nui te pupuri wai o te methyl cellulose ether, ā, he mahi anō hoki e arohia ana e te nuinga o ngā kaihanga moata ranunga maroke o te whare, inā koa ko ērā kei ngā rohe tonga he nui te pāmahana. Ko ngā āhuatanga e pā ana ki te pānga pupuri wai o te moata ranunga maroke ko te nui o te MC i tāpirihia, te matotoru o te MC, te matotoru o ngā matūriki me te pāmahana o te taiao whakamahinga.
Ko ngā āhuatanga o ngā etera cellulose e whakawhirinaki ana ki te momo, te maha me te tohatoha o ngā whakakapinga. Ko te whakarōpūtanga o ngā etera cellulose e hangai ana hoki ki te momo o ngā whakakapinga, te taumata o te etera, te wairewa me ngā āhuatanga tono e pā ana. E ai ki te momo o ngā whakakapinga i runga i te mekameka ngota, ka taea te wehewehe ki te monoether me te etera whakauru. Ko te MC e whakamahia ana e tātou ko te monoether, ā, ko te HPMC he etera whakauru. Ko te MC Methyl cellulose ether te hua i muri i te whakakapinga o te rōpū hydroxyl i runga i te waeine hukahuka o te cellulose taiao ki te methoxy. Ko te tātai hanganga ko [COH7O2(OH)3-h(OCH3)h ]x. Ka whakakapia tētahi wāhanga o te rōpū hydroxyl i runga i te waeine e te rōpū methoxy, ā, ka whakakapia tētahi atu wāhanga e te rōpū hydroxypropyl, ko te tātai hanganga ko [C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3] n]x Ethyl methyl cellulose ether HEMC, koinei ngā momo matua e whakamahia whānuitia ana, e hokona ana hoki i te mākete.
I runga i te wairewatanga, ka taea te wehewehe ki te ionic me te kore-ionic. Ko ngā ether cellulose kore-ionic wairewa-wai e rua ngā raupapa matua o ngā alkyl ether me ngā hydroxyalkyl ether. Ko te CMC ionic e whakamahia ana i roto i ngā hopi hangai, te tā me te tae kakahu, te tūhuratanga kai me te hinu. Ko te MC kore-ionic, HPMC, HEMC, me ētahi atu e whakamahia ana i roto i ngā rauemi hanga, ngā paninga rapa, te rongoā, ngā matū o ia rā, me ētahi atu. Whakamahia hei whakamātotoru, hei pupuri wai, hei whakaū, hei whakamarara me hei kaihanga kiriata.
Te pupuri wai o te cellulose ether: I roto i te hanga rauemi hanga, inā koa te moata paura maroke, he mahi nui te cellulose ether, inā koa i roto i te hanga moata motuhake (moata whakarerekētia), he wāhanga nui, he mea nui hoki. Ko te mahi nui o te cellulose ether wairewa-wai i roto i te moata he toru ngā āhuatanga matua:
1. He kaha pupuri wai pai rawa atu
2. Pānga ki te ōritetanga o te moata me te thixotropy
3. Te taunekeneke ki te sima.
Ko te pānga pupuri wai o te cellulose ether e whakawhirinaki ana ki te mimiti wai o te paparanga turanga, te hanganga o te moata, te matotoru o te paparanga moata, te hiahia wai o te moata, me te wā whakatakoto o te rauemi whakatakoto. Ko te pupuri wai o te cellulose ether tonu i ahu mai i te wairewatanga me te maroketanga o te cellulose ether tonu. E mōhio ana tātou katoa, ahakoa he nui ngā rōpū OH tino waikura kei roto i te mekameka ngota cellulose, kāore e wairewa i roto i te wai, nā te mea he teitei te taumata o te tioata o te hanganga cellulose. Kāore te kaha waikura o ngā rōpū hydroxyl anake e ranea ki te hipoki i ngā here hauwai kaha me ngā kaha van der Waals i waenga i ngā ngota. Nō reira, ka pupuhi noa engari kāore e wairewa i roto i te wai. Ina whakaurua he whakakapinga ki roto i te mekameka ngota, ehara i te mea ko te whakakapinga anake ka whakangaro i te mekameka hauwai, engari ka whakangaromia hoki te here hauwai i waenga i ngā mekameka nā te herenga o te whakakapinga i waenga i ngā mekameka tata. Ko te nui ake o te whakakapinga, ko te tawhiti i waenga i ngā ngota. Ko te tawhiti nui ake. Ko te nui ake o te pānga o te whakangaro i ngā here hauwai, ka wairewa te etera cellulose i te wai i muri i te whānui o te whatunga cellulose me te urunga o te otinga, ka hanga he otinga matotoru. Ina piki te pāmahana, ka ngoikore te wai o te polymer, ā, ka peia te wai i waenganui i ngā mekameka. Ina rawaka te pānga maroke, ka tīmata te whakakotahi i ngā ngota ngota, ka hanga he hanganga whatunga toru-ahu, ka whakapikohia.
Wā tuku: Hakihea-06-2022