Ka taea te whakamahi Hydroxyethyl methyl cellulose HEMC hei kaihoko whakamarumaru colloid, emulsifier me te dispersant na te mea he mahi kaha te mata i roto i te wairewa wai. Ko tetahi tauira o tana whakamahinga e whai ake nei: Ko te paanga o te hydroxyethyl methyl cellulose ki nga ahuatanga o te ciment. Ko te Hydroxyethyl methylcellulose he paura ma, he hongi, he kore paitini ka memeha ki te wai matao hei hanga i te wairewa maramara, kirikiri. Kei a ia nga ahuatanga o te whakapakeke, te here, te whakamarara, te whakaemulsifying, te hanga kiriata, te whakatārewa, te adsorbing, te gelling, te mahi-mata, te pupuri i te makuku me te tiaki i nga colloids. Na te mahi kaha o te mata o te wairewa wai, ka taea te whakamahi hei kaihoko tiaki colloid, he emulsifier me te dispersant. Hydroxyethyl methyl cellulose otinga aqueous he hydrophilicity pai, me te he tino-kakama te māngai pupuri wai.
whakarite
He tikanga mo te whakarite hydroxyethyl methyl cellulose, ko te tikanga ko te whakamahi i te miro para hei rauemi mata me te ethylene oxide hei kaihoko whakaetere hei whakarite hydroxyethyl methyl cellulose. Ko nga rauemi mata mo te whakarite hydroxyethyl methyl cellulose kua rite i roto i nga waahanga ma te taumaha: 700-800 nga waahanga o te ranunga o te toluene me te isopropanol hei whakarewa, 30-40 nga waahanga o te wai, 70-80 nga waahanga o te konutai hydroxide, 80-85 nga waahanga o te. miro parakore, 20-28 nga wahanga oxyethane, 80-90 nga wahanga o te methyl chloride, me te 16-19 nga wahanga o te waikawa acetic glacial; ko nga taahiraa motuhake ko:
Ko te mahi tuatahi, i roto i te reactor, me tapiri te ranunga toluene me te isopropanol, te wai, me te konutai waikawa, kia whakamahana ki te 60～80 ℃, whakakorohia mo te 20~40 meneti;
Ko te taahiraa tuarua, te whakamaaramatanga: whakamataohia nga rauemi o runga ake nei ki te 30～50 ℃, taapirihia te miro parakore, rehuhia te ranunga o te toluene me te isopropanol ki te whakarewa, whakanekehia ki te 0.006Mpa, whakakiia ki te hauota mo nga whakakapinga e 3, ka kawe i te alkali i muri i te whakakapinga. Ko nga tikanga e whai ake nei: ko te wa whakamaarama he 2 haora, ko te pāmahana whakamaarama he 30°C ki te 50°C;
Ko te taahiraa tuatoru, ko te whakamaarama: kua oti te whakamaaramatanga, ka whakatahia te reactor ki te 0.05～0.07MPa, ka taapirihia te ethylene oxide me te methyl chloride, ka pupuri mo te 30～50 meneti; te wahanga tuatahi o te whakaetahi: 40～60℃, 1.0～2.0 haora, ka whakahaerehia te pehanga i waenga i te 0.150.3Mpa; te waahanga tuarua o te whakamaarama: 60～90℃, 2.0～2.5 haora, ka whakahaerehia te pehanga i waenga i te 0.40.8Mpa;
Ko te taahiraa 4, ko te whakakorenga: taapirihia te waikawa acetic glacial i mua i mua ki te kettle precipitation, pehia ki roto i nga mea etherified mo te whakakore, whakamahana ki te 75 ~ 80 ℃ ki te kawe i te rerenga, ka piki te pāmahana ki te 102 ℃, ka kitea te uara pH. 68 Ka mutu te rerenga, ka whakakiia te taika rewharewha ki te wai tap e rongoatia ana e te taputapu whakamuri osmosis i te 90℃～100℃;
Ko te taahiraa tuarima, ko te horoinga centrifugal: ko nga mea kei te wha o nga taahiraa ka centrifuged e te centrifuge tīwiri whakapae, a ka whakawhitia te mea wehe ki te ipu horoi ki tonu i te wai wera i mua, ka horoia nga mea;
Ko te taahiraa tuaono, ko te whakamaroke centrifugal: ka haria nga mea kua horoia ki roto i te whakamaroke na roto i te centrifuge tīwiri whakapae, ka whakamarokehia te rauemi ki te 150-170°C, ka kohia nga mea kua whakamarokehia, ka kohia.
Ka whakatauritea ki te hangarau whakangao cellulose etera, ka tangohia e te tenenga o naianei te ethylene oxide hei kaihoko etherifying hei whakarite i te hydroxyethyl methyl cellulose, a he pai te kaha anti-koriri no te mea kei roto te roopu hydroxyethyl, He pai te pumau me te aukati koriri i te wa roa o te rokiroki. Ka taea te whakamahi hei utu mo etahi atu ethers cellulose.
Te wa tuku: Sep-26-2022