Hydroxyethyl methyl cellulose HEMCka taea te whakamahi hei kaiāwhina tiaki colloid, hei emulsifier me hei dispersant nā te mea he mahi kaha te mata o te wai i roto i te wairewa. Ko tētahi tauira o tana whakamahinga penei: Te pānga o te hydroxyethyl methyl cellulose ki ngā āhuatanga o te sima. Ko te Hydroxyethyl methylcellulose he paura ma, kāore he kakara, kāore he reka, kāore he paitini e rewa ana ki te wai matao hei hanga i tētahi wairewa mārama, matotoru. Kei a ia ngā āhuatanga o te whakamātotoru, te here, te horapa, te whakaemulsifying, te hanga kiriata, te whakatārewa, te mimiti, te whakapūmau, te whakakaha mata, te pupuri makuku me te tiaki i ngā colloid. Nā te mahi kaha o te mata o te wairewa, ka taea te whakamahi hei kaiāwhina tiaki colloid, hei emulsifier me te dispersant. He pai te hydrophilicity o te wairewa Hydroxyethyl methyl cellulose, ā, he kaiāwhina pupuri wai tino whai hua.
whakarite
He tikanga mō te whakarite i te hydroxyethyl methyl cellulose, ko te tikanga kei roto ko te whakamahi i te miro kua whakatikatikaina hei rauemi mata me te ethylene oxide hei kaihoko etherifying hei whakarite.te hauwaitoireti metireti pūtauKo ngā rauemi mata mō te whakarite i te hydroxyethyl methyl cellulose ka whakaritea i roto i ngā wāhanga mā te taumaha: 700-800 wāhanga o te ranunga o te toluene me te isopropanol hei whakarewa, 30-40 wāhanga wai, 70-80 wāhanga o te konutai hauwai, 80-85 wāhanga o te miro kua parakore, 20-28 wāhanga o te oxyethane, 80-90 wāhanga o te methyl chloride, me te 16-19 wāhanga o te waikawa acetic glacial; ko ngā mahi motuhake ko:
Ko te taahiraa tuatahi, i roto i te tauhohenga, tāpirihia te ranunga toluene me te isopropanol, te wai, me te konutai hauwai, whakamahanahia ki te 60～80 ℃, whakatōkia mō te 20～40 meneti;
Ko te taahiraa tuarua, te whakapūmau: whakamataohia ngā rauemi o runga ake nei ki te 30～50℃, tāpirihia te miro kua oti te whakapai, rehuhia te ranunga o te toluene me te isopropanol ki te whakarewa, whakawāteahia ki te 0.006Mpa, whakakīia ki te hauota mō ngā whakakapinga e 3, ā, whakahaerehia te kawakore i muri i te whakakapinga. Ko ngā tikanga whakapūmau penei: ko te wā whakapūmau he 2 hāora, ā, ko te pāmahana whakapūmau he 30°C ki te 50°C;
Ko te tuatoru o ngā taahiraa, ko te whakaetere: kua oti te whakapūkara, ka whakawāteahia te tauhohenga ki te 0.05～0.07MPa, ka tāpirihia te waikura etilena me te pūhaumāota metila, ā, ka puritia mō te 30～50 meneti; ko te wāhanga tuatahi o te whakaetere: 40～60℃, 1.0～2.0 hāora, ka whakahaeretia te pēhanga i waenga i te 0.150.3Mpa; ko te wāhanga tuarua o te whakaetere: 60～90℃, 2.0～2.5 hāora, ka whakahaeretia te pēhanga i waenga i te 0.40.8Mpa;
Ko te taahiraa tuawhā, te whakakorenga: tāpirihia te waikawa acetic hukapapa kua inehia ki roto i te ipu wai whakapūngao, pēhia ki roto i te rauemi kua whakapūngaohia hei whakakorenga, whakamahanahia ki te 75～80 ℃ hei whakaputa i te whakahekenga, ka piki te pāmahana ki te 102 ℃, ā, ko te uara pH kitea he 68. Ina oti te whakahekenga, ka whakakīia te tāke whakahekenga ki te wai paipa kua rongoatia e te taputapu osmosis whakamuri i te 90℃～100℃;
Ko te taahiraa tuarima, te horoinga ā-pūwero: ka pūwerohia te rauemi i te taahiraa tuawhā mā te whakamahi i te pūwero tīwiri whakapae, ā, ka whakawhitia te rauemi kua wehea ki te ipu horoi kua whakakiia ki te wai wera i mua, ā, ka horoia te rauemi;
Ko te taahiraa tuaono, te whakamaroke ā-pūwero: ka haria te rauemi kua horoia ki roto i te whakamaroke mā te pūwero tīwiri whakapae, ka whakamarokehia te rauemi i te 150-170°C, ā, ka kuruhia te rauemi maroke, ka tākaihia.
Ki te whakataurite ki te mea o nāianeite etera celluloseI roto i te hangarau whakaputa, ka whakamahia e tēnei mea hou te ethylene oxide hei matū whakapūmau hei hanga i te hydroxyethyl methyl cellulose, ā, he pai tōna kaha ki te ārai i te harore nā te mea kei roto i a ia te rōpū hydroxyethyl, he pai te pumau o te matotoru me te ātete ki te harore i te wā roa o te rokiroki. Ka taea te whakamahi hei whakakapi mō ētahi atu cellulose ethers.
Wā tuku: Paenga-whāwhā-25-2024