Ajụjụ dị mkpirikpi gbasara cellulose ethers

Cellulose ethers bụ otu ụdị kemịkalụ dị iche iche sitere na cellulose, nke bụ polima organic kachasị n'ụwa. A na-eji ihe ndị a eme ihe nke ọma n'ọtụtụ ụlọ ọrụ dị iche iche n'ihi ihe pụrụ iche ha na ojiji ha dị iche iche.

Nhazi na Njirimara nkeCellulose Ethers
Cellulose, polysaccharide nke nwere nkeji glucose ugboro ugboro nke ejikọtara ya na njikọ β(1→4) glycosidic, na-eje ozi dị ka ihe bụ isi mejupụtara mgbidi sel nke osisi. A na-emepụta ethers cellulose site na ịgbanwe otu hydroxyl (-OH) dị na molekul cellulose site na kemịkalụ. Ụdị ether cellulose kachasị ewu ewu gụnyere methyl cellulose (MC), hydroxypropyl cellulose (HPC), hydroxyethyl cellulose (HEC), carboxymethyl cellulose (CMC), na ethyl hydroxyethyl cellulose (EHEC).

Ịgbanwe otu hydroxyl na cellulose na otu ọrụ dị iche iche na-agbanwe ihe onwunwe nke cellulose ethers ndị a na-enweta. Dịka ọmụmaatụ, iwebata otu methyl na-eme ka mmiri na-agbaze na ihe ndị na-emepụta ihe nkiri dịkwuo mma, na-eme ka MC dị mma maka ojiji na ọgwụ, ngwaahịa nri, na ihe owuwu. N'otu aka ahụ, itinye otu hydroxyethyl ma ọ bụ hydroxypropyl na-eme ka idobe mmiri, ikike ịka nká, na ịrapara dịkwuo mma, na-eme ka ihe mgbakwunye HEC na HPC bara uru na ngwaahịa nlekọta onwe onye, ​​agba, na ihe nrapado. Carboxymethyl cellulose, nke a na-emepụta site na iji otu hydroxyl dochie otu carboxymethyl, na-egosipụta ezigbo njigide mmiri, nkwụsi ike, na ihe ndị na-eme ka ọ sie ike, na-eme ka a na-ejikarị ya eme ihe n'ụlọ ọrụ nri, ọgwụ, na dị ka ihe mgbakwunye mmiri na ngalaba mmanụ na gas.

Ogo nke nnọchi (DS), nke na-egosi ọnụọgụgụ nke otu hydroxyl e tinyere n'ọnọdụ otu glucose dị na cellulose, na-emetụta nke ukwuu ihe ndị dị na cellulose ethers. Ọnụọgụ DS dị elu na-ebutekarị mmụba nke ịgbaze, viscosity, na nkwụsi ike, mana oke nnọchi nwere ike imebi ike ịgbaze na njirimara ndị ọzọ a na-achọsi ike nke cellulose ethers.

Njikọ nke Cellulose Ethers
Mmepụta nke cellulose ethers gụnyere mmeghachi omume kemịkalụ nke na-ewebata otu ndị na-anọchi anya ya n'ọkwa azụ cellulose. Otu n'ime ụzọ kachasị esi emepụta cellulose ethers bụ ime ka cellulose dị n'ime ikuku site na iji ihe ndị kwesịrị ekwesị n'okpuru ọnọdụ a na-achịkwa.

Dịka ọmụmaatụ, njikọta nke methyl cellulose na-agụnyekarị mmeghachi omume nke cellulose na alkali metal hydroxides iji mepụta alkali cellulose, wee jiri methyl chloride ma ọ bụ dimethyl sulfate gwọọ iji webata otu methyl n'ime agbụ cellulose. N'otu aka ahụ, a na-emepụta hydroxypropyl cellulose na hydroxyethyl cellulose site na imeghachi omume cellulose na propylene oxide ma ọ bụ ethylene oxide, n'otu n'otu, n'ihu ihe ndị na-eme ka alkali na-akpali.

A na-emepụta carboxymethyl cellulose site na mmeghachi omume nke cellulose na sodium hydroxide na chloroacetic acid ma ọ bụ nnu sodium ya. Usoro carboxymethylation na-eme site na nnọchi nucleophilic, ebe otu hydroxyl nke cellulose na-emeghachi omume na chloroacetic acid iji mepụta njikọ carboxymethyl ether.

Mmepụta nke cellulose ethers chọrọ nlezianya na-achịkwa ọnọdụ mmeghachi omume, dị ka okpomọkụ, pH, na oge mmeghachi omume, iji nweta ogo achọrọ nke nnọchi na njirimara ngwaahịa. Na mgbakwunye, a na-ejikarị usoro nhicha iji wepụ ngwaahịa ndị na-adịghị ọcha na ihe ndị na-adịghị mma, na-ahụ na ether cellulose dị mma na ịdị n'otu.

Ngwa nke Cellulose Ethers
Cellulose ethers na-achọta ọtụtụ ngwa n'ọtụtụ ụlọ ọrụ dị iche iche n'ihi ọtụtụ ihe onwunwe na ọrụ ha. Ụfọdụ n'ime ihe ndị bụ isi gụnyere:

Ụlọ ọrụ nri:Cellulose ethersA na-ejikarị carboxymethyl cellulose eme ihe dị ka ihe na-eme ka ihe sie ike, ihe na-eme ka ihe sie ike, na ihe na-eme ka ihe sie ike n'ihe oriri dị ka ihendori, ihe eji emechi ihe, na ice cream. Ha na-eme ka udidi, viscosity, na nkwụsi ike nke shelf ka mma ebe ha na-eme ka mmetụta ọnụ na ntọhapụ nke ụtọ dịkwuo mma.

Ọgwụ: A na-eji Methyl cellulose na hydroxypropyl cellulose eme ihe n'ọtụtụ ọgwụ dị ka ihe na-ejikọ ihe, ihe na-emebi ihe, na ihe ndị na-ewepụta ihe n'ime mbadamba, kapsụl, na ihe ndị e ji echekwa ihe. Ihe ndị a na-eme ka cellulose ethers na-eme ka nnyefe ọgwụ dịkwuo mma, na-eme ka ọ dị ndụ, ma na-eme ka ndị ọrịa na-agbaso iwu.

Ihe Ndị E Ji Arụ Ọrụ: A na-eji Methyl cellulose na hydroxyethyl cellulose eme ihe n'ụlọ ọrụ owuwu ụlọ dị ka ihe mgbakwunye na ngwa agha, plasta, na taịlị e ji simenti mee iji mee ka ọrụ dịkwuo mma, idobe mmiri, na ihe ndị e ji agwakọta ya. Ha na-eme ka njikọ dịkwuo mma, na-ebelata mgbawa, ma na-eme ka arụmọrụ nke ihe owuwu dịkwuo mma.

Ngwaahịa Nlekọta Onwe Onye: Hydroxyethyl cellulose na hydroxypropyl cellulose bụ ihe ndị a na-ahụkarị na ngwaahịa nlekọta onwe onye dịka shampoos, ude mmiri, na ude ndị ọzọ.

Ha na-eme ka akpụkpọ ahụ sie ike, na-eme ka ọ sie ike, ma na-eme ka ọ sie ike. Ha na-eme ka akpụkpọ ahụ dị nro, na-adị mma ma na-eme ka usoro nhazi ahụ dịkwuo mma.

Agba na Mkpuchi: Cellulose ethers na-arụ ọrụ dị ka ihe na-agbanwe rheology, ihe na-eme ka ihe sie ike, na ihe na-eme ka ihe sie ike na agba, ihe mkpuchi, na ihe na-eme ka ihe na-arụ ọrụ ka mma, na-eme ka usoro mmiri na-asọ, na-eme ka ihe ndị na-agbapụta mmiri na-arụ ọrụ nke ọma. Ha na-eme ka njikwa viscosity dịkwuo mma, na-eguzogide sag, na-emekwa ka agba kwụsie ike na usoro ndị e ji mmiri mee.

Ụlọ Ọrụ Mmanụ na Gas: A na-eji Carboxymethyl cellulose eme ihe dị ka ihe na-agbanwe viscosity na ihe na-achịkwa mfu mmiri n'ime mmiri ndị a na-egwupụta maka nchọpụta na mmepụta mmanụ na gas. Ọ na-eme ka rheology mmiri dị mma, nhicha oghere, na nkwụsi ike nke olulu mmiri ma na-egbochi mmebi nke nhazi.

Ụlọ Ọrụ Uwe: A na-eji cellulose ethers eme ihe n'ibipụta ákwà, ịgba agba, na imecha ya iji mee ka nkọwa mbipụta dịkwuo mma, mmepụta agba, na ịdị nro nke ákwà. Ha na-eme ka mgbasa nke agba dị mfe, ịrapara na eriri, na ịsacha ya ngwa ngwa n'ọrụ ákwà.

Cellulose ethersna-anọchite anya otu ụdị kemịkalụ dị iche iche sitere na cellulose, na-enye ọtụtụ ihe onwunwe na ọrụ dị iche iche maka ngwa ụlọ ọrụ dị iche iche. Site na mgbanwe kemịkalụ a na-achịkwa nke azụ cellulose, cellulose ethers na-egosipụta njirimara ndị a na-achọsi ike dị ka mmiri ịgbaze, njikwa viscosity, na nkwụsi ike, na-eme ka ha bụrụ ihe mgbakwunye bara uru na ụlọ ọrụ dị iche iche site na nri na ọgwụ ruo na owuwu na ákwà. Ka ọchịchọ maka ihe ndị na-adigide na gburugburu ebe obibi na-aga n'ihu na-eto, cellulose ethers dị njikere ịrụ ọrụ dị mkpa n'imezu mkpa na-agbanwe agbanwe nke ụlọ ọrụ ọgbara ọhụrụ ma na-ebelata mmetụta gburugburu ebe obibi.