Mmetụta siri ike nke cellulose ether

Cellulose ethersbụ otu nke vasatail polymers ọtụtụ ebe a na-eji dị iche iche ụlọ ọrụ maka thickening Njirimara. Malite na mmeghe nke cellulose ethers na ihe eji arụ ọrụ ha, akwụkwọ a na-abanye n'ime usoro dị n'azụ mmetụta ha na-esiwanye ike, na-akọwa otú mmekọrịta na ụmụ irighiri mmiri si eduga na nkwalite viscosity. A na-atụle ụdị cellulose ethers dị iche iche, gụnyere methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, na carboxymethyl cellulose, nke ọ bụla nwere àgwà nrịgo pụrụ iche. Ngwa nke cellulose ethers na ụlọ ọrụ ndị dị ka ihe owuwu, ọgwụ, nri, ihe ịchọ mma, na nlekọta onwe onye, ​​na-egosipụta ọrụ dị mkpa ha na nhazi ngwaahịa na usoro mmepụta ihe. N'ikpeazụ, a na-ekwusi ike mkpa cellulose ethers na omume ụlọ ọrụ ọgbara ọhụrụ, yana atụmanya ọdịnihu na ọganihu nwere ike na nkà na ụzụ cellulose ether.

Cellulose ethers na-anọchi anya otu klas nke polymers sitere na cellulose, biopolymer dị ebe nile nke a na-achọta na mgbidi cell osisi. Site na akụrụngwa physicochemical pụrụ iche, a na-eji cellulose ethers eme ihe n'ọtụtụ ụlọ ọrụ dị iche iche, nke bụ isi maka mmetụta ha na-eto eto. Ikike nke cellulose ethers na-abawanye viscosity na melite rheological Njirimara na-eme ka ha dị mkpa n'ọtụtụ ngwa sitere na ihe owuwu ụlọ ruo na usoro ọgwụ.

Njirimara 1.Structural nke cellulose ethers

Tupu ịbanye n'ime mmetụta siri ike nke cellulose ethers, ọ dị mkpa ịghọta ihe nhazi ha. A na-emepụta ethers cellulose site na mgbanwe kemịkalụ nke cellulose, nke bụ isi gụnyere mmeghachi omume etherification. Otu hydroxyl (-OH) dị na ọkpụkpụ azụ cellulose na-enweta mmeghachi omume ngbanwe na otu ether (-OR), ebe R na-anọchi anya ihe dị iche iche. Ngbanwe a na-eduga n'ịgbanwe n'usoro ihe omimi na ihe onwunwe nke cellulose, na-enye àgwà dị iche iche na cellulose ethers.

Mgbanwe nhazi na cellulose ethers na-emetụta ike ha, omume rheological, na ihe ndị na-eme ka ọ dị arọ. Ogo nke nnọchi (DS), nke na-ezo aka na nkezi ọnụọgụ nke otu hydroxyl nọchiri anya otu anhydroglucose, na-arụ ọrụ dị oke mkpa n'ịchọpụta njirimara nke ethers cellulose. DS dị elu n'ozuzu na-ejikọta ya na ụbara solubility na ịrụ ọrụ nke ọma.

2.Mechanisms nke Thickening Mmetụta

Mmetụta njupụta nke cellulose ethers gosipụtara sitere na mmekọrịta ha na ụmụ irighiri mmiri. Mgbe a gbasasịrị n'ime mmiri, ethers cellulose na-enweta hydration, ebe mkpụrụ ndụ mmiri na-etolite njikọ hydrogen na atom oxygen ether na otu hydroxyl nke ụdọ polymer. Usoro hydration a na-eduga na ọzịza nke cellulose ether particles na nhazi nke usoro netwọk akụkụ atọ n'ime mmiri mmiri.

Nchikota nke agbụ cellulose ether hydrated na nguzobe nke njikọ hydrogen n'etiti ụmụ irighiri ihe polymer na-enye aka na nkwalite viscosity. Na mgbakwunye, nchụso electrostatic dị n'etiti otu ether ebubo na-adịghị mma na-enye aka n'ịba ụba site n'igbochi nsochi nke ụdọ polymer na ịkwalite mgbasasa na ihe mgbaze.

Omume rheological nke cellulose ether ngwọta na-emetụta ihe ndị dị ka nchịkọta polymer, ogo nke nnọchi, ịdị arọ molecular, na okpomọkụ. N'ebe dị ala, ngwọta cellulose ether na-egosipụta omume Newtonian, ebe ọ bụ na ọkwa dị elu, ha na-egosipụta àgwà pseudoplastic ma ọ bụ ihe na-egbuke egbuke n'ihi nkwụsị nke mgbagwoju anya polymer n'okpuru nrụgide siri ike.

3.Ụdị cellulose ethers
Cellulose ethers na-agụnye ụdị dị iche iche dị iche iche, nke ọ bụla na-enye ihe ọkụkụ dị iche iche dabara adaba maka ngwa dị iche iche. Ụfọdụ ụdị cellulose ethers a na-ejikarị gụnyere:

Methyl Cellulose (MC): Methyl cellulose na-enweta site na etherification nke cellulose na methyl otu. Ọ bụ soluble na mmiri oyi na-etolite uzo, viscous ngwọta. MC na-egosipụta ọmarịcha njide mmiri ma na-ejikarị eme ihe dị ka ihe na-ewu ụlọ, mkpuchi, na ngwaahịa nri.

Hydroxyethyl Cellulose (HEC): Hydroxyethyl cellulose bụ njikọ

zed site na iwebata otu hydroxyethyl n'ime ọkpụkpụ azụ cellulose. Ọ bụ soluble na ma oyi na mmiri ọkụ na-egosipụta pseudoplastic omume. A na-eji HEC eme ihe n'ụdị ọgwụ, ngwaahịa nlekọta onwe onye, ​​yana dị ka ihe na-agba agba na agba latex.

Hydroxypropyl Cellulose (HPC): A na-akwado hydroxypropyl cellulose site na etherification nke cellulose na otu hydroxypropyl. Ọ na-agbaze n'ọtụtụ ihe mgbaze, gụnyere mmiri, mmanya na ihe mgbaze. A na-arụkarị HPC n'ọrụ dị ka onye na-eke ihe, ihe nkedo, na onye na-emepụta ihe nkiri na ọgwụ, ihe ịchọ mma, na mkpuchi.

Carboxymethyl Cellulose (CMC): Carboxymethyl cellulose na-emepụta site na carboxymethylation nke cellulose na chloroacetic acid ma ọ bụ ya sodium nnu. Ọ bụ nke ukwuu soluble na mmiri na-etolite viscous ngwọta na magburu onwe pseudoplastic omume. CMC na-achọta ngwa dị ukwuu na ngwaahịa nri, ọgwụ, textiles, na imepụta akwụkwọ.

Ethers cellulose ndị a na-egosipụta ihe dị iche iche na-eme ka ọkpụkpụ, njirimara solubility, na ndakọrịta na ihe ndị ọzọ, na-eme ka ha dị mma maka ngwa dịgasị iche iche n'ofe ụlọ ọrụ.

4. Ngwa nke cellulose ethers
Ngwongwo na-emekọ ihe nke cellulose ethers na-eme ka ha dị mkpa na ngwa ụlọ ọrụ dị iche iche. Ụfọdụ isi ngwa nke cellulose ethers gụnyere:

Ihe eji arụ ọrụ: A na-eji cellulose ethers eme ihe n'ọtụtụ ebe dị ka ihe mgbakwunye na ihe ndị dabeere na ciment dị ka ngwa agha, grout, na plasta iji meziwanye ọrụ, njide mmiri, na nrapado. Ha na-arụ ọrụ dị ka ndị na-eme mgbanwe rheology, na-egbochi ikewapụ na ịkwalite arụmọrụ nke ngwaahịa ihe owuwu.

Pharmaceuticals: Cellulose ethers na-achọta ngwa dị ukwuu n'ụdị usoro ọgwụ dị ka ihe na-ekekọta, ihe na-agbasa, na ihe na-eme ka ọ sie ike na mbadamba nkume, capsules, nkwusioru, na ngwọta anya. Ha na-eme ka ihe ndị na-asọ asọ nke ntụ ntụ dịkwuo mma, na-eme ka nchịkọta mbadamba nkume dị mfe, ma na-achịkwa ntọhapụ nke ihe ndị na-arụ ọrụ.

Ngwaahịa Nri: A na-ejikarị ethers cellulose arụ ọrụ dị ka ndị na-emekọ ihe, na-eme ka ahụ sie ike na gelling n'ọtụtụ ngwaahịa nri, gụnyere sauces, uwe, desserts, na ngwaahịa mmiri ara ehi. Ha na-akwalite udidi, viscosity, na mmetụta ọnụ ebe ha na-emezi nkwụsi ike shelf na igbochi syneresis.

Ihe ịchọ mma na nlekọta onwe onye: A na-eji ethers cellulose eme ihe na ihe ịchọ mma na ngwaahịa nlekọta onwe onye dị ka ude, ude mmiri, shampoos, na ntanya eze dị ka ndị na-agba agba, emulsifiers, na ndị na-emepụta ihe nkiri. Ha na-enye akụrụngwa rheological na-achọsi ike, na-akwalite nkwụsi ike ngwaahịa, ma na-enye udidi mara mma na nke okomoko.

Agba na mkpuchi:Cellulose ethersna-eje ozi dị ka rheology modifiers na agba, mkpuchi, na adhesives, na-emezi njikwa viscosity, nguzogide sag, na nhazi ihe nkiri. Ha na-enye aka na nkwụsi ike nke usoro nhazi, na-egbochi nhazi pigmenti, ma kwalite njirimara ngwa.

Mmetụta siri ike nke cellulose ethers na-arụ ọrụ dị mkpa na usoro mmepụta ihe dị iche iche na nhazi ngwaahịa. Njirimara rheological ha pụrụ iche, ndakọrịta na ihe ndị ọzọ, na biodegradability na-eme ka ha nhọrọ kacha amasị ndị nrụpụta n'ofe mpaghara dị iche iche. Ka ụlọ ọrụ na-aga n'ihu na-ebute nkwado nkwado na ihe ngwọta enyi na enyi, a na-atụ anya ka a na-achọ cellulose ethers.