Focus on Cellulose ethers

O le a le mea e fa'aoga ai le Cellulose Ether?

1. Aotelega:

O le cellulose ether o se polymer masani, o lona fausaga kemikolo o se polysaccharide macromolecule e faʻavae i luga o le anhydrous β-glucose, ma e tasi le vaega muamua o le hydroxyl ma le lua lua hydroxyl vaega i luga o mama faavae taʻitasi. E ala i le fesuiaiga o vailaʻau, e mafai ona maua se faasologa o mea e maua mai i le cellulose, ma o le cellulose ether o se tasi oi latou. Cellulose ether o se polymer compound ma se fausaga ether e faia i le cellulose, e pei o le methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, ma isi. E masani lava, e mafai ona maua i le gaioiga o le alkali cellulose ma monochloroalkane, ethylene oxide , propylene oxide poʻo le monochloroacetic acid.

2. Fa'atinoga ma Fa'ailoga:

(1) Fa'aaliga foliga

O le cellulose ether e masani ona pa'epa'e po'o le susu papa'e, e leai se manogi, e le o'ona, efuefu fibrous pauta, e faigofie ona mitiia le susu, ma solo i totonu o se colloid mautu viscous manino i le vai.

(2) Fausia ata tifaga ma pipii

O le etherification o le cellulose ether o loʻo i ai se aafiaga tele i ona uiga ma le faʻatinoga, e pei o le solubility, ata-fausia gafatia, malosi faʻamau ma le masima tetee. O le cellulose ether e iai le malosi faʻainisinia maualuga, fetuutuunai, vevela vevela ma le malulu, ma e lelei le fetaui lelei ma resins eseese ma plasticizers, ma e mafai ona faʻaaogaina e fai ai palasitika, ata tifaga, varnishes, faʻapipiʻi, latex ma vailaʻau faʻapipiʻi mea, ma isi.

(3) Solubility

Methylcellulose e soluble i vai malulu, e le mafai ona solu i vai vevela, ma soluble foi i nisi solvents organic; methyl hydroxyethyl cellulose e solu i le vai malulu, e le mafai ona solu i vai vevela ma solu faʻalaʻau. Ae peita'i, a fa'avevela le vaifofo o le methylcellulose ma le methylhydroxyethylcellulose, o le a fa'afefete le methylcellulose ma le methylhydroxyethylcellulose. Methylcellulose precipitates i le 45-60°C, ae o le vevela vevela o fefiloi etherified methyl hydroxyethyl cellulose faateleina i le 65-80°C. Pe a faʻaititia le vevela, e toe faʻamaʻapeʻa le paʻu. Hydroxyethyl cellulose ma le sodium carboxymethyl hydroxyethyl cellulose e solu i le vai i so'o se vevela ma e le mafai ona solu i so'o so'o.

(4) mafiafia

O le cellulose eter e solo i totonu o le vai i le colloidal form, ma o lona viscosity e faalagolago i le tikeri o le polymerization o le cellulose ether. O le vaifofo o loʻo i ai macromolecules faʻamamaina. Ona o le lavelave o macromolecules, o le tafega o vaifofo e ese mai le vai o Newtonian, ae o loʻo faʻaalia ai se amio e suia i suiga i le malosi o le shear. Ona o le macromolecular structure o le cellulose ether, o le viscosity o le fofo e faʻateleina vave i le faʻateleina o le faʻatonuga ma faʻaitiitia vave i le faʻateleina o le vevela.

Fa'aaogāga

(1) Alamanuia suau'u

Sodium carboxymethyl cellulose e masani ona faʻaaogaina i le suauʻu suauʻu, ma e faʻaaogaina i le gaosiga o palapala e faʻateleina ai le viscosity ma faʻaitiitia ai le vai. E mafai ona tete'e eseese soluble masima filogia ma faateleina le toe faaleleia suauu. Sodium carboxymethyl hydroxypropyl cellulose (NaCMHPC) ma le sodium carboxymethyl hydroxyethyl cellulose (NaCMHEC) o mea lelei e viliina ai le palapala ma mea mo le sauniaina o vai faʻamaeʻaina, faʻatasi ai ma le maualuga o le slurrying ma le masima tetee, Lelei le anti-calcium performance, lelei viscosity-faʻateleina gafatia, faʻafefe vevela (160 ℃) meatotino. E fetaui lelei mo le tapenaina o vai e viliina mo vai fou, vai o le sami ma vai masima tumu. E mafai ona faʻapipiʻiina i vai eliina o densities eseese (103-127g / cm3) i lalo o le mamafa o le calcium chloride, ma o loʻo i ai se viscosity patino ma maualalo le suavai gau, o lona viscosity-faʻateleina le gafatia ma le gau o le suavai faʻaitiitia le gafatia e sili atu nai lo le hydroxyethyl cellulose. , ma o se faʻaopoopoga lelei mo le faʻateleina o le gaosiga o suauʻu.

Sodium carboxymethyl cellulose o se cellulose derivative masani faʻaaogaina i le faagasologa o le suauʻu suauʻu. E faʻaaogaina i le suauʻu viliina, sima sua, gau gau ma faʻaleleia le toe faʻaleleia o le suauʻu, aemaise lava ile sua suauʻu. E masani lava ona faia le matafaioi o le faʻaitiitia o le suavai gau ma faʻateleina le viscosity. O le Hydroxyethyl cellulose (HEC) o lo'o fa'aaogaina e avea o se palapala mafiafia ma fa'amautu i le faagasologa o le viliina, fa'amae'aina lelei ma le sima. Pe a faatusatusa i le sodium carboxymethyl cellulose ma le guar gum, o le hydroxyethyl cellulose e iai sona aafiaga mafiafia lelei, malosi malosi o le oneone, maualuga le masima, malosi lelei o le vevela, laʻititi faʻafefiloi, faʻaitiitia le suavai, ma le gau o gel. Poloka, maualalo toega ma isi uiga, ua faʻaaogaina lautele.

(2) Faufale ma fale vali

Sodium carboxymethyl cellulose e mafai ona faʻaaogaina e fai ma mea faʻafefe, vai faʻamauina, mafiafia ma faʻapipiʻi mo le fausiaina o masonry ma faʻapipiʻiina o mea faʻafefiloi, ma e mafai ona faʻaaogaina e pei o le sima, sima ma mea e faʻaleleia ai le eleele mo le gypsum base ma le sima e faʻaaogaina e pei o le dispersant, vai. e fa'atumauina ma mafiafia. O se masonry faʻapitoa ma faʻapipiʻi paluga faʻafefiloi e faia i le carboxymethyl cellulose, lea e mafai ona faʻaleleia ai le faʻaogaina, taofiofia o le vai ma le faʻafefeteina o le sima, ma aloese mai le taʻe ma le gaogao i le puipui poloka. talipalau. O mea faufale faufale na faia e Cao Mingqian ma isi se mea e fa'alelei ai le fale mai le methyl cellulose. E faigofie ma mama le faagasologa o le gaosiga. E mafai ona faʻaaogaina mo puipui maualuga ma luga o maʻa maʻa, ma e mafai foi ona faʻaogaina mo teuteuga luga o koluma ma maa faamanatu.

(3) Alamanuia kemikolo i aso taitasi

O le stabilizing viscosifier sodium carboxymethyl cellulose o loʻo taʻalo i le taʻapeʻapeina ma le faʻamautu faʻamautu i oloa faʻapipiʻi o mea faʻapipiʻi paʻu paʻu, ma taʻalo le matafaioi o le mafiafia, faʻasalalau ma homogenizing i le vai poʻo le emulsion cosmetics. E mafai ona faʻaaogaina e fai ma faʻamautu ma tackifier. Emulsion stabilizers e faʻaaogaina e fai ma emulsifiers, mafiafia ma faʻamautu mo suauu ma shampoos.Sodium carboxymethyl hydroxypropyl cellulosee mafai ona faʻaaogaina e fai ma faʻamautu mo mea faʻapipiʻi toothpaste. O lo'o i ai mea lelei thixotropic, lea e lelei ai le toothpaste i le fa'aogaina, teuina mo se taimi umi e aunoa ma le fa'aleagaina, ma le tofo ma le maaleale. Sodium carboxymethyl hydroxypropyl cellulose e sili atu le masima masima ma acid resistance, ma o lona aafiaga e sili mamao atu nai lo le carboxymethyl cellulose. E mafai ona faʻaaogaina e avea o se mafiafia i vailaʻau faʻamaʻi ma se mea e faʻafefe ai le pisia. Faʻasalalau faʻasalalau i le gaosiga o vailaʻau, sodium carboxymethylcellulose e masani ona faʻaaogaina e avea o se palapala palapala mo le fufuluina o le paʻu, o se mafiafia ma se faʻasalalauga mo vai faʻafefe.

(4) Fa'afomai ma mea'ai

I totonu o fale talavai, hydroxypropyl carboxymethylcellulose (HPMC) e mafai ona faʻaaogaina e avea o se vailaʻau faʻamalositino, faʻaaogaina lautele i le tuʻuina atu o vailaʻau faʻamaʻi faʻamaʻi faʻamaʻi ma sauniuniga faʻasaʻo faʻamalolo, e avea o se mea e faʻasaʻo ai mea e faʻatonutonu ai le tuʻuina atu o vailaʻau, e fai ma mea faʻapipiʻi e faʻatuai ai le Faʻamalolo. fa'apipi'i, pelleti fa'alaua'itele, kapoti fa'alaua'itele. O le mea e sili ona fa'aaogaina o le methyl carboxymethyl cellulose ma le ethyl carboxymethyl cellulose, e pei o le MC, lea e masani ona fa'aogaina e fai ai papa ma capsules, po'o le fa'aofuina o papa e ufiufi ai le suka. E mafai ona faʻaaogaina le cellulose ethers sili ona lelei i totonu o fale gaosi meaʻai, ma e faʻamalosia lelei, faʻamautu, mea faʻapitoa, vai faʻamauina ma mea faʻainisinia faʻafefe i meaʻai eseese. Methyl cellulose ma le hydroxypropyl methyl cellulose ua iloa o ni mea e le afaina ai le tino. Ole mama maualuga (sili atu ile 99.5%) carboxymethylcellulose (CMC) e mafai ona faʻaopopo i meaʻai, e pei o susu ma kulimi oloa, faʻamalo, siamu, jelly, meaʻai apa, sirup laulau ma meainu. Carboxymethyl cellulose ma le mama o le sili atu i le 90% e mafai ona faʻaaogaina i meaʻai e fesoʻotaʻi ma meaʻai, e pei o le felauaiga ma le teuina o fualaau aina fou. O lenei ituaiga palasitika afifi ei ai le lelei o le lelei fou-tausia aafiaga, itiiti le filogia, leai se faaleagaina, ma faigofie gaosiga masini.

(5) Mea fa'aoga fa'apitoa ma eletise

Electrolyte thickening stabilizer ei ai le mama maualuga o le cellulose ether, tetee acid lelei ma masima tetee, aemaise lava le maualalo o le uʻamea ma le mamafa o mea uamea, o lea e matua mautu le colloid, talafeagai mo maa alkaline, maa zinc-manganese Electrolyte thickening stabilizer. Ole tele ole cellulose ethers o lo'o fa'aalia ai le tioata fa'ainu vai. O le Hydroxypropyl cellulose acetate e fausia ai tioata vai o le cholesteric thermotropic i lalo ole 164°C.


Taimi meli: Ian-12-2023
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