Te tautuhi kounga o te cellulose ether

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.

Ko ngā āhuatanga o ngā cellulose ethers e whakawhirinaki ana ki te momo, te maha me te tohatoha o ngā whakakapinga. Ka whakarōpūtia hoki te whakarōpūtanga o te cellulose ether i runga i te momo whakakapinga, te taumata o te etherification, te wairewa me ngā āhuatanga tono e pā ana. E ai ki te momo whakakapinga i runga i te mekameka ngota, ka taea te wehewehe ki te monoether me te ether whakauru. Ko te MC e whakamahia ana e mātou ko te monoether, ā, ko te HPMC he ether whakauru. Ko te Methyl cellulose ether MC te hua i muri i te whakakapinga o te rōpū hydroxyl i runga i te waeine glucose o te cellulose taiao ki te methoxy. He hua i whiwhihia mā te whakakapi i tētahi wāhanga o te rōpū hydroxyl i runga i te waeine me te rōpū methoxy me tētahi atu wāhanga me te rōpū hydroxypropyl. Ko te tātai hanganga ko [C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3]n]x Hydroxyethyl 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 tautuhi kounga o te cellulose ether:

Te pānga o te ihirangi methoxyl ki te kounga: te pupuri wai me te mahi whakamātotoru

Te awe o te kounga o te ihirangi hydroxyethoxyl/hydroxypropoxyl: ka nui ake te ihirangi, ka pai ake te pupuri wai.

Te awe o te kounga matotoru: ka teitei ake te tohu o te whakapūhui, ka teitei ake te matotoru, ā, ka pai ake te pupuri wai.

Te awe o te kounga o te pai: ko te pai ake o te marara me te whakarewa i roto i te moata, ko te tere me te ōrite ake, ā, ko te pai ake o te pupuri wai

Pānga kounga o te whakawhiti mārama: ka teitei ake te tohu o te polymerization, ka ōrite ake te tohu o te polymerization, ā, ka iti ake ngā poke.

Pānga kounga pāmahana tiēre: ko te pāmahana tiēre mō te hanga he tata ki te 75°C

Te awe o te kounga wai: <5%, he ngāwari te mimiti o te makuku ki te cellulose ether, nō reira me hiri, me rongoa hoki.

Pānga ki te kounga o te pungarehu: <3%, ka nui ake te paru ka nui ake te teitei o te pungarehu

Te pānga kounga uara PH: tata ki te kūpapa, he pumau te mahi a te cellulose ether i waenga i te PH: 2-11