He Papamuri me te Tirohanga
Ko te Cellulose ether he rauemi matū polymer pai i hangaia mai i te cellulose polymer taiao ma te maimoatanga matū.Whai muri i te hanga o te cellulose nitrate me te cellulose acetate i te rautau 1800, kua whakawhanakehia e nga tohunga kemu he raupapa o nga kohinga cellulose o te maha o nga eter cellulose, a kua kitea nga waahi tono hou, he maha nga waahanga ahumahi.Ko nga hua ether cellulose penei i te konutai carboxymethyl cellulose (CMC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), methyl hydroxyethyl cellulose (MHEC) me te methyl hydroxypropyl cellulose (MHPC) me etahi atu etera cellulose e mohiotia ana "monosodium glutamate ahumahi" a kua whakamahia nuitia i roto i te keri hinu, te hanga, te paninga, te kai, te rongoa me nga matū o ia ra.
Ko te Hydroxyethyl methyl cellulose (MHPC) he paura ma, karekau he kakara, karekau he paitini ka taea te rewa i roto i te wai matao hei hanga i te wairewa maataata.Kei a ia nga ahuatanga o te matotoru, te here, te marara, te whakaemulsifying, te hanga kiriata, te whakatārewatanga, te adsorbing, te gelling, te kaha o te mata, te pupuri i te makuku me te tiaki i te colloid.Na te kaha o nga mata o te wairewa wai, ka taea te whakamahi hei kaihoko whakamarumaru colloidal, emulsifier me te dispersant.Hydroxyethyl methylcellulose wairewa wai he hydrophilicity pai, me te he māngai pupuri wai pai.Na te mea kei roto i te hydroxyethyl methylcellulose nga roopu hydroxyethyl, he pai te kaha ki te aukati i te koriri, he pai te pumau o te pokey me te aukati koriri i roto i te rokiroki mo te wa roa.
Ko te Hydroxyethyl methylcellulose (HEMC) kua whakaritea ma te whakauru i nga whakakapi o te ethylene oxide (MS 0.3 ~ 0.4) ki roto i te methylcellulose (MC), a he pai ake te tote o te tote i nga polymers kaore i whakarereketia.He teitei ake hoki te mahana o te methylcellulose i tera o te MC.
Hanganga
Āhuahira
Ko nga ahuatanga matua o te hydroxyethyl methylcellulose (HEMC) ko:
1. Wairewa: Ka whakarewahia ki te wai me etahi whakarewa waro.Ka taea te whakakore i te HEMC ki te wai matao.Ko tona kukū teitei ka whakatauhia e te pokey anake.He rereke te wairewa ki te pokey.Ko te iti o te pokey, ka nui ake te whakarewatanga.
2. Atete tote: Ko nga hua HEMC he etera cellulose kore-katote, ehara i te polyelectrolytes, no reira he tino pumau i roto i nga wairewa wai i te wa e noho ana nga tote whakarewa, nga electrolytes waro ranei, engari ko te nui o te taapiri o nga electrolytes ka puta te huka me te ua.
3. Mahi mata: Na te mahi kaha o te mata o te wairewa wai, ka taea te whakamahi hei kaihoko tiaki colloidal, emulsifier me te dispersant.
4. Waariki waiariki: Ka werahia te wairewa wai o nga hua HEMC ki tetahi pāmahana, ka noho puatakore, ka pupuhi, ka pupuhi, engari ka whakamatao tonu, ka hoki mai ki te ahua o te otinga taketake, me te mahana o tenei ra. ka puta te rerenga ko te nuinga kei runga i a raatau hinu whakahinuhinu, awhina aukati, colloids whakamarumaru, whakaemulsifier etc.
5. Te ngoikore o te metabolic me te iti o te kakara me te kakara: Kei te whakamahia nuitia te HEMC ki te kai me te rongoa na te mea karekau e whakakorikoria, he iti te kakara me te kakara.
6. Te atete ki te koriri: He pai te ahua o te HEMC ki te koriri me te pai o te whakapumautanga i roto i te rokiroki mo te wa roa.
7. PH pūmautanga: Ko te pokey o te otinga wai o ngā hua HEMC he whakauaua pāngia e te waikawa alkali ranei, a he āhua pūmau te uara pH i roto i te whānuitanga o 3.0 ki 11.0.
Taupānga
Ka taea te whakamahi Hydroxyethyl methylcellulose hei kaihoko whakamarumaru colloidal, emulsifier me te dispersant na te kaha o te mahi mata i roto i te wairewa wai.Ko ona tauira tono e whai ake nei:
1. Te painga o te hydroxyethyl methylcellulose ki te mahi sima.Ko te Hydroxyethyl methylcellulose he paura ma kore-paitini, karekau he kakara, karekau he paitini ka taea te rewa i roto i te wai matao hei hanga i te wairewa puataata.Kei a ia nga ahuatanga o te matotoru, te here, te marara, te whakaemulsifying, te hanga kiriata, te whakatārewatanga, te adsorbing, te gelling, te kaha o te mata, te pupuri i te makuku me te tiaki i te colloid.I te mea he mahi hohe nga papa o te wairewa wai, ka taea te whakamahi hei kaihoko whakamarumaru colloidal, emulsifier me te dispersant.Hydroxyethyl methylcellulose wairewa wai he hydrophilicity pai, me te he māngai pupuri wai pai.
2. Kua whakaritea he peita awhina tino ngawari, he mea hanga mai i nga rauemi mata e whai ake nei i roto i nga waahanga ma te taumaha: 150-200 g o te wai whakaheke;60-70 g o te whakaehunga kiriaku parakore;550-650 g o te konupūmā taumaha;70-90 g o te paura talcum;Wairewa wai cellulose turanga 30-40g;wairewa wai lignoscellulose 10-20g;awhina hanga kiriata 4-6g;antiseptic me te fungicide 1.5-2.5g;marara 1.8-2.2g;mākū mākū 1.8-2.2g;3.5-4.5g;Ethylene glycol 9-11g;Ka mahia te wairewa wai hydroxyethyl methylcellulose ma te whakakore i te 2-4% hydroxyethyl methylcellulose i roto i te wai;Ko te wairewa wai lignoscellulose he mea hanga ki te 1-3 % Ka mahia te Lignocellulose ma te memeha ki te wai.
Whakaritenga
He tikanga whakarite mo te hydroxyethyl methyl cellulose, ko te tikanga ko te miro parakore ka whakamahia hei rauemi mata, ka whakamahia te ethylene oxide hei kaihoko whakamaarama hei whakarite i te hydroxyethyl methyl cellulose.Ko nga waahanga taumaha o nga rauemi mata mo te whakarite hydroxyethyl methylcellulose e whai ake nei: 700-800 nga waahanga o te toluene me te ranunga isopropanol hei whakarewa, 30-40 nga waahanga wai, 70-80 nga waahanga o te konutai hydroxide, 80-85 nga waahanga o te miro para, mowhiti. 20-28 nga wahanga o te oxy ethane, 80-90 nga wahanga o te methyl chloride, 16-19 nga wahanga o te waikawa acetic glacial;ko nga taahiraa motuhake ko:
Ko te taahiraa tuatahi, i roto i te kettle tauhohenga, whakauruhia te toluene me te ranunga isopropanol, te wai, me te konutai waikawa, te wera ki te 60-80 ° C, kia mahana mo te 20-40 meneti;
Ko te taahiraa tuarua, te whakamaaramatanga: whakamatao i nga rauemi o runga ake nei ki te 30-50°C, taapirihia te miro parakore, te rehu i te toluene me te wairewa ranunga isopropanol, whakakorua ki te 0.006Mpa, whakakiia te hauota mo nga whakakapinga e 3, me te kawe i muri i te whakakapi i te Alkalinization, te whakamaaramatanga. Ko nga tikanga: ko te wa whakamaarama he 2 haora, a ko te pāmahana whakamaarama he 30°C ki te 50°C;
Ko te taahiraa tuatoru, ko te whakamaarama: i muri i te otinga o te whakamaaramatanga, ka nekehia te reactor ki te 0.05-0.07MPa, ka taapirihia te ethylene oxide me te methyl chloride mo te 30-50 meneti;ko te waahi tuatahi o te whakamaarama: 40-60 ° C, 1.0-2.0 haora, ka whakahaerehia te pehanga i waenga i te 0.15 me te 0.3Mpa;te waahanga tuarua o te whakamaarama: 60～90℃, 2.0～2.5 haora, ka whakahaerehia te pehanga i waenga i te 0.4 me te 0.8Mpa;
Ko te wha o nga taahiraa, ko te whakakorenga: taapirihia te waikawa acetic glacial kua inehia ki mua ki te kettle precipitation, pehia ki roto i nga mea kua whakahiatohia mo te whakakore, whakaarahia te pāmahana ki te 75-80 ° C mo te rerenga, ka piki te pāmahana ki te 102 ° C, me te pH ka kitea te uara ko te 6 I te 8 karaka, ka oti te whakakorenga;ka whakakiia te tank desolventization ki te wai tap kua rongoahia e te taputapu whakamuri osmosis i te 90 ° C ki te 100 ° C;
Ko te taahiraa tuarima, ko te horoinga centrifugal: ko nga mea kei te wha o nga taahiraa ka centrifuged i roto i te centrifuge tīwiri whakapae, a ka whakawhitia te rauemi wehe ki te tank horoi ki tonu i te wai wera i mua mo te horoi o te rauemi;
Ko te ono o nga taahiraa, te whakamaroke centrifugal: ka tukuna 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 kuru, ka kohia nga mea maroke.
Ka whakatauritea ki te hangarau whakangao cellulose etera o naianei, ka whakamahia e te tenenga o naianei he ethylene oxide hei kaihoko whakamaarama hei whakarite i te hydroxyethyl methyl cellulose, he pai te atete ki te koriri na te mea kei roto nga roopu hydroxyethyl.He pai te whakapumautanga me te koriri i roto i te rokiroki mo te wa roa.Ka taea te whakamahi hei utu mo etahi atu ethers cellulose.
Wā tuku: Maehe-10-2023