Hydroxyethyl Methyl Selulosa

O le Cellulose ether o se mea fa'aonaponei e fa'aaogaina lautele e faia mai le cellulose polymer masani e ala i togafitiga vaila'au. Ina ua maeʻa le gaosiga o le cellulose nitrate ma le cellulose acetate i le 19th seneturi, ua atiaʻe e chemists se faasologa o mea e maua mai i le cellulose o le tele o cellulose ethers, ma o loʻo maua pea avanoa fou, e aofia ai le tele o vaega o pisinisi. Cellulose ether oloa e pei ole sodium carboxymethyl cellulose (CMC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), hydroxypropyl cellulose (HPC), methyl hydroxyethyl cellulose (MHEC) ma methyl hydroxypropyl cellulose (MHPC) ma isi cellulose ethers ua lauiloa o "industrial monosodium glutamate" ma ua faʻaaogaina lautele i le suauʻu suauʻu, fausiaina, faʻaofuofu, meaʻai, vailaʻau ma vailaʻau i aso uma.

Hydroxyethylmethylcellulose(MHEC) ose pauta pa'epa'e e leai se manogi, e leai se tofo, e le o'ona e mafai ona fa'amavae i le vai malulu e fai ai se vaifofo manino. O loʻo i ai uiga o le mafiafia, fusifusia, faʻasalalau, emulsifying, ata tifaga, faʻagata, adsorbing, gelling, galue i luga, tausia le susu ma le puipuia o colloid. Ona o le galue malosi i luga o le vaifofo vai, e mafai ona faaaoga e avea o se colloidal puipuiga sooupu, emulsifier ma dispersant. Hydroxyethyl methylcellulose vaifofo vai e lelei le hydrophilicity ma o se so'o lelei taofi vai. Talu ai ona o le hydroxyethyl methylcellulose o loʻo i ai vaega hydroxyethyl, e lelei lona malosi e tetee atu i le palapala, lelei le mautu o le viscosity ma le mildew i le taimi o le teuina umi.

Hydroxyethyl methylcellulose (HEMC) ua saunia e ala i le tuʻuina atu o le ethylene oxide substituents (MS 0.3 ~ 0.4) i le methylcellulose (MC), ma o lona masima e sili atu nai lo polymers e leʻi faʻaleleia. O le vevela gelation o le methylcellulose e maualuga atu foi nai lo le MC.

fausaga:

Vaega:

O uiga autu o le hydroxyethyl methylcellulose (HEMC) o:

1. Soluble: Solu i le vai ma nisi solvents organic. HEMC e mafai ona solo i vai malulu. O lona maualuga maualuga e na'o le fuaina o le viscosity. E eseese le solu ma le viscosity. O le maualalo o le viscosity, o le tele o le solubility.
2. Tete'e masima: O oloa HEMC e le-ionic cellulose ethers ma e le o ni polyelectrolytes, o lea e matua mautu i vaifofo vai pe a iai masima uʻamea poʻo eletise eletise, ae o le faʻaopoopoga tele o electrolytes e mafai ona mafua ai gelation ma timuga.
3. Fa'asagaga i luga ole laiga: Ona o le galue malosi i luga ole vai, e mafai ona fa'aaogaina e avea o se mea e puipuia ai colloidal, emulsifier ma dispersant.
4. Gel Thermal: Pe a vevela le vaifofo vai o oloa HEMC i se vevela faapitoa, e avea opaque, gels, ma precipitates, ae pe a faaauau pea cooled, e toe foi i le tulaga muamua fofo, ma le vevela lea o lenei gel ma timuga. tupu e tele lava Fa'alagolago ia i latou lubricants, fesoasoani taofia, colloids puipui, emulsifiers etc.
5. Metabolism inert ma maualalo le manogi ma le manogi: HEMC e masani ona faʻaaogaina i meaʻai ma vailaʻau aua o le a le faʻafefeteina ma e maualalo le manogi ma le manogi.
6. Tete'e o Mildew: O le HEMC o lo'o i ai se tulaga lelei tele e tete'e ai i le palapala ma lelei le mautu o le viscosity i le taimi umi e teu ai.
7. PH mautu: O le viscosity o le vaifofo vai o oloa HEMC e tau le afaina i le acid poʻo le alkali, ma o le tau o le pH e matua mautu i totonu ole va ole 3.0 i le 11.0.

Talosaga:

Hydroxyethyl methylcellulose e mafai ona faʻaaogaina e avea o se mea e puipuia ai colloidal, emulsifier ma faʻasalalau ona o lona gaioiga galue i luga o le vai. O ana fa'ata'ita'iga e fa'apea:

1. Aafiaga ole hydroxyethyl methylcellulose ile faatinoga ole sima. Hydroxyethyl methylcellulose ose pa'epa'e pa'epa'e e leai se manogi, e leai se tofo, e le'o'ona e mafai ona fa'amavae i le vai malulu e fai ai se vaifofo manino. O loʻo i ai uiga o le mafiafia, fusifusia, faʻasalalau, emulsifying, ata tifaga, faʻagata, adsorbing, gelling, galue i luga, tausia le susu ma le puipuia o colloid. Talu ai o le vaifofo vai o loʻo i ai se luga o loʻo galue malosi, e mafai ona faʻaaogaina e avea o se mea e puipuia ai colloidal, emulsifier ma dispersant. Hydroxyethyl methylcellulose vaifofo vai e lelei le hydrophilicity ma o se so'o lelei taofi vai.
2. Ua saunia se vali faʻamalolo ma le maualuga o le fetuutuunai, lea e faia i mea mataʻutia nei i vaega i le mamafa: 150-200 g o vai faʻafefeteina; 60-70 g o le emulsion acrylic mama; 550-650 g o le calcium mamafa; 70-90 g o le paʻu paʻu; 30-40g faavae cellulose vaifofo vai; 10-20g lignoscellulose vaifofo vai; 4-6g fesoasoani fai ata; 1.5-2.5g faʻamaʻi ma siama; 1.8-2.2g dispersant; 3.5-4.5g; Ethylene glycol 9-11g; O le vaifofo vai o le hydroxyethyl methylcellulose e faia e ala i le faʻamavaeina o le 2-4% hydroxyethyl methylcellulose i le vai; O le vaifofo lignoscellulose e faia i le 1-3% Lignocellulose e faia e ala i le solo i le vai.

Sauniuniga:

O se auala sauniuni o le hydroxyethyl methylcellulose, o le auala o le faʻaaogaina o le cotton faʻamamaina e fai ma mea mata ma le ethylene oxide e fai ma sui etherification e saunia ai le hydroxyethyl methylcellulose. O vaega mamafa o mea mataʻina mo le saunia o le hydroxyethyl methyl cellulose o loʻo taua i lalo: 700-800 vaega o toluene ma le isopropanol faʻafefiloi e pei o solvent, 30-40 vaega o le vai, 70-80 vaega o le sodium hydroxide, 80-85 vaega o le cotton faʻamamaina, mama 20-28 vaega o le oxyethane, 80-90 vaega o le methyl chloride, 16-19 vaega ole acetic acid; o laasaga patino o:

O le laasaga muamua, i le ulo tali, faaopoopo toluene ma isopropanol paluga, vai, ma le sodium hydroxide, vevela i le 60-80 ° C, faʻamafanafana mo le 20-40 minute;

O le laasaga lona lua, alkalization: faʻamafanafana mea o loʻo i luga i le 30-50 ° C, faʻaopopo le cotton faʻamamaina, faʻafefe le toluene ma le isopropanol faʻafefiloi solvent, pamu i le 0.006Mpa, faʻatumu le nitrogen mo le 3 sui, ma faʻataunuʻu pe a uma le sui Alkalinization, le tulaga alkalization e: o le alkalization taimi e 2 itula, ma le alkalization vevela o le 30°C i le 50°C;

O le laasaga lona tolu, etherification: ina ua maeʻa le alkalization, e aveese le reactor i le 0.05-0.07MPa, ma faʻaopoopo le ethylene oxide ma le methyl chloride mo le 30-50 minute; le laasaga muamua o le etherification: 40-60 ° C, 1.0-2.0 Itula, o le mamafa e pulea i le va o le 0.15 ma le 0.3Mpa; le vaega lona lua o le etherification: 60 ~ 90 ℃, 2.0 ~ 2.5 itula, o le mamafa e pulea i le va o le 0.4 ma le 0.8Mpa;

O le laasaga lona fa, faʻagata: Faʻaopoopo le fua o le suka acetic acid i luma atu i le ulo timuga, faʻapipiʻi i totonu o mea faʻapipiʻi mo le faʻaleagaina, siitia le vevela i le 75-80 ° C mo timuga, o le vevela e oʻo i le 102 ° C, ma le pH tau o le 6 I le 8 i le taeao, ua maeʻa le faʻamama; o le tane fa'amama e fa'atumuina i vai paipa e fa'aogaina e se masini fa'asolosolo i le 90 ° C i le 100 ° C;

O le laasaga lona lima, fufuluina centrifugal: o mea i le laasaga lona fa o loʻo faʻapipiʻiina e ala i se centrifuge faʻalava faʻalava, ma o mea tuʻueseese e faʻafeiloaʻi i se tane fufulu faʻatumu i vai vevela muamua mo le fufuluina o mea;

O le laasaga lona ono, faʻamago centrifugal: o mea fufulu e momoli atu i totonu o le mea faʻagogo e ala i se centrifuge faʻalava faʻalava, ma faʻamago mea i le 150-170 ° C, ma o mea mamago e nutimomoia ma afifi.

Pe a faatusatusa i le cellulose ether gaosiga tekinolosi oi ai nei, o le mea fou fou e faaaoga ethylene oxide o le etherification sooupu e saunia hydroxyethyl methyl cellulose, lea ei ai le malosi anti-molifua lelei ona o loo i ai vaega hydroxyethyl. E lelei le viscosity mautu ma mildew tetee i taimi umi teuina. E mafai ona faʻaaogaina nai lo isi ethers cellulose.