Ko te CMC he matū pūmua anionic i hangaia mā te tauhohe i te cellulose tūturu ki te alkali caustic me te waikawa monochloroacetic, me te taumaha ngota o te 6400 (±1 000). Ko ngā hua taha matua ko te konutai pūhaumāota me te konutai glycolate. Nō roto te CMC i te whakarerekētanga cellulose tūturu. Kua tapaina mana ko te "cellulose whakarerekētia" e te Whakahaere Kai me te Ahuwhenua o te Kotahitanga o ngā Whenua (FAO) me te Whakahaere Hauora o te Ao (WHO).
kounga
Ko ngā tohu matua hei ine i te kounga o te CMC ko te nui o te whakakapinga (DS) me te parakore. I te nuinga o te wā, he rerekē ngā āhuatanga o te CMC ina rerekē te DS; ki te teitei ake te nui o te whakakapinga, ka pai ake te wairewa, ā, ka pai ake te mārama me te pumau o te otinga. E ai ki ngā pūrongo, he pai ake te mārama o te CMC ina ko te nui o te whakakapinga he 0.7-1.2, ā, ko te matotoru o tōna otinga wai te mea nui rawa atu ina ko te uara pH he 6-9. Hei whakarite i tōna kounga, hei tāpiri atu ki te whiriwhiri i te kaihoko etherifying, me whai whakaaro anō hoki ki ētahi āhuatanga e pā ana ki te nui o te whakakapinga me te parakore, pērā i te whanaungatanga horopeta i waenga i te kawakore me te kaihoko etherifying, te wā etherification, te nui o te wai o te pūnaha, te pāmahana, te uara pH, te kukū o te otinga me ngā tote.
Te tātari i ngā painga me ngā ngoikoretanga o te konutai carboxymethyl cellulose
He mea hou te whanaketanga o te konutai carboxymethyl cellulose. Ina koa i ngā tau tata nei, nā te whānui haere o ngā mara tono me te whakaiti i ngā utu whakaputa kua piki haere te rongonui o te hanga carboxymethyl cellulose. He whakaranu ngā hua e hokona ana.
Kātahi, me pēhea te whakatau i te kounga o te konutai carboxymethyl cellulose, ka tātarihia e mātou mai i ētahi tirohanga ā-tinana me te matū:
Tuatahi, ka taea te wehewehe mai i tōna pāmahana whakawaro. Ko te pāmahana whakawaro whānui o te konutai carboxymethyl cellulose he 280-300 ° C. Ina whakawarohia i mua i te taenga ki tēnei pāmahana, ka raru tēnei hua. (Ko te tikanga, ka whakamahia te oumu whakawaro)
Tuarua, e mōhiotia ana tēnei e tōna pāmahana whakarerekētanga tae. I te nuinga o te wā, ka huri te tae o te konutai carboxymethyl cellulose ina tae ki tētahi pāmahana. Ko te awhe pāmahana he 190-200 °C.
Tuatoru, ka taea te tautuhi mai i tōna āhua. Ko te āhua o te nuinga o ngā hua he paura mā, ā, ko te rahi o tōna matūriki he 100 mata te whānui, ā, ko te tūponotanga o te puta ko te 98.5%.
He hua cellulose tino whānui te whakamahinga o te konutai carboxymethyl cellulose, ā, he whānui hoki ōna whakamahinga, nō reira, tera pea ētahi mea rūpahu kei te mākete. Nō reira, me pēhea te tautuhi mēnā he hua e hiahiatia ana e ngā kaiwhakamahi, ka taea e koe te whakaoti i te whakamātautau tautuhi e whai ake nei.
Kōwhiria he 0.5 karamu o te konutai carboxymethyl cellulose, kāore i te tino mārama mēnā he hua o te konutai carboxymethylcellulose, whakarewahia ki roto i te 50mL o te wai ka whakaohokia, tāpirihia he iti i ia wā, whakaohokia ki te 60 ~ 70 ℃, ka whakamahana mō te 20 meneti kia puta he otinga ōrite, whakamataohia. I muri i te kitenga wai, i mahia ngā whakamātautau e whai ake nei.
1. Tāpirihia te wai ki te otinga whakamātautau kia 5 ngā wā i whakaranua ai, tāpirihia te 0.5mL o te otinga whakamātautau waikawa chromotropic ki te pata kotahi, ka whakamahana i roto i te kaukau wai mō te 10 meneti kia puta he whero-papura.
2. Tāpirihia te 10 mL o te acetone ki te 5 mL o te otinga whakamātautau, rūrūtia, ka whakaohokia kia pai kia puta he putunga mātotoru.
3. Tāpirihia te 1mL o te otinga whakamātautau ketone sulfate ki te 5mL o te otinga whakamātautau, whakaohokia, ka rūrū kia puta he putunga kikorangi mārama.
4. Ko te toenga i whiwhihia mā te tahu pungarehu o tēnei hua e whakaatu ana i te tauhohenga tikanga o te tote konutai, arā, te konutai carboxymethyl cellulose.
Mā ēnei mahi, ka taea e koe te tautuhi mēnā he konutai carboxymethyl cellulose te hua i hokona, me tōna parakore, e whakarato ana i tētahi tikanga māmā noa iho, whai hua hoki mō ngā kaiwhakamahi ki te whiriwhiri tika i ngā hua.
Wā tuku: Whiringa-ā-rangi 12-2022