Methylcellulose (MC) bụ ụdị ether cellulose. Ogige ether cellulose bụ ihe ndị e nwetara site na mgbanwe kemịkalụ nke cellulose eke, na methylcellulose bụ ihe dị mkpa cellulose e nwetara site na methylating (methyl nnọchi) akụkụ hydroxyl nke cellulose. Ya mere, methylcellulose abụghị naanị ihe sitere na cellulose, kamakwa ether cellulose na-ahụkarị.
1. Nkwadebe nke methylcellulose
A na-akwado Methylcellulose site na imeghachi cellulose na onye na-ahụ maka methylating (dị ka methyl chloride ma ọ bụ dimethyl sulfate) n'okpuru ọnọdụ alkaline iji methylate akụkụ hydroxyl nke cellulose. Mmeghachi omume a na-emekarị na otu hydroxyl na ọnọdụ C2, C3 na C6 nke cellulose iji mepụta methylcellulose na ogo dị iche iche nke nnọchi. Usoro mmeghachi omume bụ nke a:
Cellulose (polysaccharide nke mejupụtara nkeji glucose) bụ nke mbụ na-arụ ọrụ n'okpuru ọnọdụ alkaline;
Mgbe ahụ, a na-ewebata onye ọrụ methylating ka ọ nweta mmeghachi omume etherification iji nweta methylcellulose.
Usoro a nwere ike ịmepụta ngwaahịa methylcellulose nwere viscosities dị iche iche na ihe solubility site na ịhazi ọnọdụ mmeghachi omume na ogo methylation.
2. Njirimara nke methylcellulose
Methylcellulose nwere ihe ndị a bụ isi:
Solubility: N'adịghị ka cellulose eke, methylcellulose nwere ike ịgbaze na mmiri oyi ma ọ bụghị na mmiri ọkụ. Nke a bụ n'ihi na iwebata methyl substituents na-emebi njikọ hydrogen n'etiti mkpụrụ ndụ cellulose, si otú ahụ na-ebelata kristal ya. Methylcellulose na-emepụta ihe ngwọta na-egbuke egbuke na mmiri ma na-egosipụta njirimara gelation na okpomọkụ dị elu, ya bụ, ngwọta na-eto eto mgbe ọ na-ekpo ọkụ ma nwetaghachi mmiri mgbe ọ jụrụ.
Ihe na-adịghị egbu egbu: Methylcellulose adịghị egbu egbu ma ọ dịghị etinye ya n'ahụ na usoro nri mmadụ. Ya mere, a na-ejikarị ya eme ihe na nri na ihe mgbakwunye ọgwụ dị ka thickener, emulsifier na stabilizer.
Ntuziaka viscosity: Methylcellulose nwere ezigbo viscosity regulation properties, na viscosity ngwọta ya metụtara ntinye ngwọta na ịdị arọ molecular. Site na ịchịkwa ogo ngbanwe na mmeghachi omume etherification, ngwaahịa methylcellulose nwere oke viscosity dị iche iche nwere ike nweta.
3. Ojiji nke methylcellulose
N'ihi ihe pụrụ iche anụ ahụ na kemịkal ya, methylcellulose ejirila ya mee ihe n'ọtụtụ ụlọ ọrụ.
3.1 Ụlọ ọrụ nri
Methylcellulose bụ ihe mgbakwunye nri a na-ejikarị eme ihe n'ụdị nhazi nri dị iche iche, ọkachasị dị ka thickener, emulsifier na stabilizer. Ebe ọ bụ na methylcellulose nwere ike ịla mgbe ọ na-ekpo ọkụ ma weghachite mmiri mmiri mgbe ọ jụrụ, a na-ejikarị ya eme ihe na nri oyi kpọnwụrụ, ngwaahịa esiri esi na ofe. Na mgbakwunye, ọdịdị obere kalori nke methylcellulose na-eme ka ọ bụrụ ihe dị mkpa na ụfọdụ usoro nri nwere obere kalori.
3.2 Ụlọ ọrụ ọgwụ na ọgwụ
A na-eji Methylcellulose eme ihe n'ọtụtụ ebe na ụlọ ọrụ ọgwụ, ọkachasị na mmepụta mbadamba, dị ka ihe mgbakwunye na ihe mgbakwunye. N'ihi ikike ngbanwe nke viscosity ya dị mma, ọ nwere ike melite ike n'ibu na nbibi nke mbadamba. Na mgbakwunye, a na-ejikwa methylcellulose mee ihe dị ka ihe eji akwa akwa na ophthalmology iji gwọọ anya nkụ.
3.3 Ụlọ ọrụ ihe owuwu na ihe
N'ime ihe owuwu ụlọ, a na-eji methylcellulose mee ihe na ciment, gypsum, mkpuchi na adhesives dị ka onye na-ekpuchi mmiri, mmiri na-ejide mmiri na ihe nkiri mbụ. N'ihi njide mmiri dị mma, methylcellulose nwere ike imeziwanye mmiri na ịrụ ọrụ nke ihe owuwu ma zere ọgbọ nke mgbawa na oghere.
3.4 Ụlọ ọrụ ịchọ mma
A na-ejikwa Methylcellulose eme ihe na ụlọ ọrụ ịchọ mma dị ka ihe na-agba ume na stabilizer iji nyere aka ịmepụta emulsions na gels na-adịte aka. Ọ nwere ike imeziwanye mmetụta nke ngwaahịa ahụ ma kwalite mmetụta moisturize. Ọ bụ hypoallergenic na dị nro, ọ dịkwa mma maka akpụkpọ anụ.
4. Ntụle nke methylcellulose na ndị ọzọ cellulose ethers
Cellulose ethers bụ ezinụlọ buru ibu. Na mgbakwunye na methylcellulose, e nwekwara ethyl cellulose (EC), hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC) na ụdị ndị ọzọ. Isi ihe dị iche ha dị n'ụdị na ogo nke nnọchi nke ihe nnọchi anya na molekul cellulose, nke na-ekpebi ike ha, viscosity na mpaghara ngwa.
Methylcellulose vs Hydroxypropyl Methylcellulose (HPMC): HPMC bụ ụdị methylcellulose emelitere. Na mgbakwunye na methyl substituent, a na-ewebata hydroxypropyl, nke na-eme ka solubility nke HPMC dị iche iche. Enwere ike agbaze HPMC n'ụdị okpomọkụ dị ukwuu, yana okpomọkụ gelation ya dị elu karịa nke methylcellulose. Ya mere, na ihe owuwu ụlọ na ụlọ ọrụ ọgwụ, HPMC nwere ọtụtụ ngwa ngwa.
Methylcellulose vs Ethyl Cellulose (EC): Ethyl cellulose bụ ihe a na-adịghị ahụkebe na mmiri, ma soluble na organic solvents. A na-ejikarị ya eme ihe n'ụdị akpụkpọ anụ na-adịgide adịgide maka mkpuchi na ọgwụ. Methyl cellulose na-agbaze n'ime mmiri oyi ma a na-ejikarị ya eme ihe dị ka ihe na-esi ísì na ihe na-ejigide mmiri. Ebe ntinye ya dị iche na nke ethyl cellulose.
5. Usoro mmepe nke cellulose ethers
Site n'ịbawanye ụbara maka ihe na-adigide na kemịkalụ akwụkwọ ndụ akwụkwọ ndụ, ogige cellulose ether, gụnyere methyl cellulose, ji nke nta nke nta na-aghọ akụkụ dị mkpa nke ihe ndị na-emetụta gburugburu ebe obibi. A na-enweta ya site na eriri osisi sitere n'okike, a na-emegharị ya, ọ pụkwara imebi ya na gburugburu ebe obibi. N'ọdịnihu, ebe ntinye nke cellulose ethers nwere ike gbasaa ọzọ, dị ka ike ọhụrụ, ụlọ akwụkwọ ndụ akwụkwọ ndụ na biomedicine.
Dị ka ụdị cellulose ether, methyl cellulose na-ejikarị eme ihe n'ọtụtụ ụlọ ọrụ n'ihi ọdịdị anụ ahụ na kemịkal pụrụ iche. Ọ bụghị naanị na ọ nwere ezigbo solubility, na-adịghị egbu egbu, na ezigbo ikike imezi viscosity, kamakwa ọ na-arụ ọrụ dị mkpa na nri, ọgwụ, ihe owuwu na ihe ịchọ mma. N'ọdịnihu, na-arịwanye elu na-achọ ihe ndị na-emetụta gburugburu ebe obibi, atụmanya ntinye nke methyl cellulose ga-aba ụba.
Oge nzipu: Ọkt-23-2024