Methylcellulose (MC) bụ ụdị cellulose ether. Cellulose ether compounds bụ ihe ndị sitere na mgbanwe kemịkalụ nke cellulose eke, methylcellulose bụkwa ihe dị mkpa sitere na cellulose nke methylating (methyl substitution) nke hydroxyl nke cellulose mepụtara. Ya mere, methylcellulose abụghị naanị ihe sitere na cellulose, kamakwa ọ bụ cellulose ether nkịtị.
1. Nkwadebe nke methylcellulose
A na-akwadebe Methylcellulose site na iji ihe na-eme ka cellulose meghachi omume na ihe na-eme ka methylating (dịka methyl chloride ma ọ bụ dimethyl sulfate) n'okpuru ọnọdụ alkaline iji mee ka akụkụ hydroxyl nke cellulose dị na methylate. Mmeghachi omume a na-emekarị na otu hydroxyl na ọnọdụ C2, C3 na C6 nke cellulose iji mepụta methylcellulose nwere ọkwa dị iche iche nke nnọchi. Usoro mmeghachi omume bụ dị ka ndị a:
A na-ebu ụzọ rụọ ọrụ cellulose (polysaccharide nke nwere glucose units) n'okpuru ọnọdụ alkaline;
Mgbe ahụ, a na-ewebata ihe na-eme ka methylating dị ka ihe na-eme ka etherification pụta iji nweta methylcellulose.
Usoro a nwere ike imepụta ngwaahịa methylcellulose nwere viscosity na njirimara mgbaze dị iche iche site na ịchịkwa ọnọdụ mmeghachi omume na ọkwa nke methylation.
2. Àgwà nke methylcellulose
Methylcellulose nwere ihe ndị a dị mkpa:
Mmiri Na-agbaze: N'adịghị ka cellulose eke, methylcellulose nwere ike ịgbaze na mmiri oyi mana ọ bụghị na mmiri ọkụ. Nke a bụ n'ihi na ntinye nke ihe ndị na-anọchi methyl na-ebibi njikọ hydrogen dị n'etiti molekul cellulose, si otú a na-ebelata ịdị mma kristal ya. Methylcellulose na-emepụta mmiri doro anya na mmiri ma na-egosipụta njirimara gelation na okpomọkụ dị elu, ya bụ, mmiri ahụ na-eme ka ọ sie ike mgbe a na-ekpo ọkụ ma na-enwetaghachi mmiri mmiri mgbe ọ jụrụ oyi.
Enweghị nsí: Methylcellulose anaghị egbu egbu, usoro nri mmadụ anaghịkwa abanye ya n'ime ahụ. Ya mere, a na-ejikarị ya eme ihe na ihe mgbakwunye nri na ọgwụ dị ka ihe na-eme ka ọ sie ike, ihe na-eme ka ihe sie ike, na ihe na-eme ka ọ kwụsie ike.
Njikwa Viscosity: Methylcellulose nwere ezigbo ihe ndị na-achịkwa viscosity, viscosity ngwọta ya na-ejikọta ya na mkpokọta ngwọta na ibu molekul. Site n'ịchịkwa oke nnọchi na mmeghachi omume etherification, enwere ike nweta ngwaahịa methylcellulose nwere oke viscosity dị iche iche.
3. Ojiji nke methylcellulose
N'ihi ihe pụrụ iche o nwere n'anụ ahụ na kemikal, a na-eji methylcellulose eme ihe n'ọtụtụ ụlọ ọrụ.
3.1 Ụlọ ọrụ nri
Methylcellulose bụ ihe mgbakwunye nri a na-ejikarị eme ihe n'ọtụtụ nhazi nri, ọkachasị dị ka ihe na-eme ka ihe sie ike, ihe na-eme ka ihe sie ike, na ihe na-eme ka ọ sie ike. Ebe ọ bụ na methylcellulose nwere ike ịgbaze ma weghachite mmiri mmiri mgbe ọ jụrụ oyi, a na-ejikarị ya eme ihe na nri kpọnwụrụ akpọnwụ, ihe e ji eme achịcha na ofe. Na mgbakwunye, methylcellulose nwere obere kalori na-eme ka ọ bụrụ ihe dị mkpa na ụfọdụ usoro nri nwere obere kalori.
3.2 Ụlọ ọrụ ọgwụ na ahụike
A na-ejikarị Methylcellulose eme ihe n'ụlọ ọrụ ọgwụ, ọkachasị n'imepụta mbadamba, dị ka ihe na-enyere aka na ihe na-ejikọ. N'ihi ikike ya dị mma maka ịgbanwe viscosity, ọ nwere ike imeziwanye ike igwe na ihe ndị na-emebi emebi nke mbadamba. Na mgbakwunye, a na-ejikwa methylcellulose dị ka ihe e ji akwa anya arụ iji gwọọ anya kpọrọ nkụ.
3.3 Ụlọ ọrụ owuwu na ihe eji arụ ọrụ
N'ime ihe ndị e ji arụ ụlọ, a na-ejikarị methylcellulose eme ihe na simenti, gypsum, ihe mkpuchi na ihe nrapado dị ka ihe na-eme ka ihe dị arọ, ihe na-ejide mmiri na ihe nkiri. N'ihi ezigbo nchekwa mmiri ya, methylcellulose nwere ike ime ka ihe owuwu ahụ dị mfe ma na-arụ ọrụ nke ọma ma zere mmepụta nke mgbawa na oghere ndị na-adịghị mma.
3.4 Ụlọ ọrụ ịchọ mma
A na-ejikarị Methylcellulose eme ihe n'ụlọ ọrụ ịchọ mma dị ka ihe na-eme ka ihe sie ike ma na-eme ka ọ sie ike iji nyere aka mepụta emulsions na gels na-adịte aka. Ọ nwere ike ime ka mmetụta nke ngwaahịa ahụ ka mma ma mee ka mmetụta mmiri dị mma. Ọ naghị akpata allergies ma dị nro, ọ dịkwa mma maka akpụkpọ ahụ dị nro.
4. Ntụnyere methylcellulose na cellulose ethers ndị ọzọ
Ethers cellulose bụ nnukwu ezinụlọ. 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 na ụdị na ogo nnọchi nke ihe ndị na-anọchi anya na molekul cellulose, nke na-ekpebi ike ha nwere ịgbaze, viscosity na ebe eji ha eme ihe.
Methylcellulose vs Hydroxypropyl Methylcellulose (HPMC): HPMC bụ ụdị methylcellulose ka mma. Na mgbakwunye na ihe mgbakwunye methyl, a na-ewebata hydroxypropyl, nke na-eme ka ike ịgbaze nke HPMC dịkwuo iche iche. Enwere ike ịgbaze HPMC n'ọtụtụ okpomọkụ sara mbara, okpomọkụ gelation ya dịkwa elu karịa nke methylcellulose. Ya mere, n'ihe owuwu ụlọ na ụlọ ọrụ ọgwụ, HPMC nwere ọtụtụ ojiji.
Methylcellulose vs Ethyl Cellulose (EC): Ethyl cellulose anaghị agbaze na mmiri, mana ọ na-agbaze na ihe ndị na-agbaze na organic. A na-ejikarị ya eme ihe na ihe ndị na-eme ka akpụkpọ ahụ dịgide maka mkpuchi na ọgwụ. A na-agbaze Methyl cellulose na mmiri oyi ma a na-ejikarị ya eme ihe dị ka ihe na-eme ka ọ sie ike ma na-ejide mmiri. Ebe e ji ya eme ihe dị iche na nke ethyl cellulose.
5. Usoro mmepe nke cellulose ethers
Ka ọchịchọ maka ihe ndị na-adịgide adịgide na kemịkalụ akwụkwọ ndụ na-abawanye, ihe ndị dị na cellulose ether, gụnyere methyl cellulose, na-aghọ ihe dị mkpa nke ihe ndị na-adịghị emebi gburugburu ebe obibi. A na-esi na eriri osisi eke enweta ya, ọ na-agbanwe agbanwe, a pụkwara imebi ya n'ụzọ ebumpụta ụwa. N'ọdịnihu, a pụrụ ịgbasa ebe e ji cellulose ethers eme ihe, dịka na ike ọhụrụ, ụlọ akwụkwọ ndụ akwụkwọ ndụ na biomedicine.
Dịka ụdị cellulose ether, a na-ejikarị methyl cellulose eme ihe n'ọtụtụ ụlọ ọrụ n'ihi ihe pụrụ iche nke anụ ahụ na kemịkalụ ya. Ọ bụghị naanị na ọ nwere ezigbo mgbaze, enweghị nsí, na ikike ịgbanwe viscosity dị mma, kamakwa ọ na-arụ ọrụ dị mkpa na nri, ọgwụ, owuwu na ihe ịchọ mma. N'ọdịnihu, ka ọchịchọ maka ihe ndị na-adịghị emerụ gburugburu ebe obibi na-abawanye, atụmanya ojiji nke methyl cellulose ga-abawanye.
Oge ozi: Ọktoba-23-2024