Hydroxyethyl Methyl Cellulose

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.

HydroxyethylmethylcelluloseKo te (MHEC) he paura ma karekau he kakara, he reka, 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. Nā ki te mata mahi kaha o te wairewa wai, ka taea te whakamahi i te reira rite te kaihoko tiaki 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 i te koriri i te wa e rokiroki ana 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 wai 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 whakamahanahia te wairewa wai o nga hua HEMC ki tetahi pāmahana, ka noho puatakore, he kaera, ka heke, engari ka whakamatao tonu, ka hoki ano ki te ahua o te otinga taketake, me te mahana o tenei ra me te rerenga. Ka puta ko te nuinga kei runga i a raatau nga hinu whakahinuhinu, awhina aukati, colloids whakamarumaru, whakaemulsifiers etc.
5. Ko te Metabolism he ngoikore me te iti te kakara me te kakara: Kei te whakamahia nuitia te HEMC ki te kai me te rongoa na te mea kare e whakakorikoria, he iti te kakara me te kakara.
6. Te ātete ki te koriri: He pai te parenga o te HEMC ki te koriri me te pai o te whakapumautanga i te wa e rokiroki ana mo te wa roa.
7. PH pūmautanga: Ko te pokey o te wairewa wai o nga hua HEMC karekau e pa ki te waikawa, ki te kawakawa ranei, me te uara pH kei roto i te awhe o te 3.0 ki te 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 mata kaha te mahi 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 me te tino ngawari, he mea hanga mai i nga rauemi mata e whai ake nei i roto i nga waahanga i runga i 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; 30-40g turanga wairewa wai cellulose; 10-20g wairewa wai lignoscellulose; 4-6g awhina hanga kiriata; 1.5-2.5g antiseptic me te huakita; 1.8-2.2g te whakamarara; 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 methylcellulose, ko te tikanga ko te whakamahi i te miro parakore hei rauemi mata me te ethylene oxide hei kaihoko etherification ki te whakarite hydroxyethyl methylcellulose. Ko nga waahanga taumaha o nga rauemi mata mo te whakarite hydroxyethyl methyl cellulose e whai ake nei: 700-800 nga waahanga o te toluene me te ranunga 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 para, mowhiti 20-28 nga waahanga o te oxyethane, 80-90 nga waahanga 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: whakamataohia nga rauemi o runga ake nei ki te 30-50°C, taapirihia te miro parakore, ka rehu i te toluene me te wairewa ranunga isopropanol, ka pupuhi ki te 0.006Mpa, whakakiia te hauota mo nga whakakapinga e 3, ka kawe i muri i te whakakapinga Alkalinization, te Ko nga tikanga o te whakamaaramatanga ko: 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: 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, te whakakore: Tāpirihia te waikawa acetic glacial i mua i mua ki te kettle precipitation, pehia ki roto i te rauemi etherified 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 Ko te uara he 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, ka whakamahia e te tenenga o naianei te ethylene oxide hei kaihoko etherification ki te whakarite hydroxyethyl methyl cellulose, he pai te kaha anti-mold 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.