Focus on Cellulose ethers

Mmezi nke hydroxyethyl cellulose

Mmezi nke hydroxyethyl cellulose

Hydroxyethyl cellulose(HEC) bụ polymer soluble mmiri nke a na-ejikarị eme ihe na ụlọ ọrụ dị iche iche dị ka ọgwụ, ihe ịchọ mma, na nri. A na-enweta HEC site na cellulose, polymer eke dị na osisi, ma gbanwee ya na ìgwè hydroxyethyl iji meziwanye mmiri mmiri na ihe ndị ọzọ.

Ntucha nke HEC gụnyere ọtụtụ usoro iji mee ka ọ dị ọcha na gbanwee polymer iji mezuo ihe achọrọ maka iji ya eme ihe. Ihe ndị a bụ ụfọdụ n'ime usoro ndị a na-ahụkarị na nhazi nke HEC:

1. Ịdị ọcha: Nzọụkwụ mbụ na nhazi nke HEC bụ nchacha nke cellulose raw material. Nke a na-agụnye iwepụ adịghị ọcha dị ka lignin, hemicellulose, na ihe ndị ọzọ na-emerụ emerụ nke nwere ike imetụta àgwà na njirimara nke ngwaahịa ikpeazụ. Enwere ike ime ka ọ dị ọcha site na ụzọ dị iche iche dị ka ịsacha, ịcha ọcha, na ọgwụgwọ enzymatic.

2. Alkalization: Mgbe emechara ka ọ dị ọcha, a na-emeso cellulose na ngwọta alkaline iji mee ka mmeghachi omume ya dịkwuo elu ma mee ka ntinye nke ìgwè hydroxyethyl dị ike. A na-ejikarị sodium hydroxide ma ọ bụ potassium hydroxide eme Alkalization na okpomọkụ na nrụgide dị elu.

3. Etherification: Nzọụkwụ ọzọ bụ iwebata ìgwè hydroxyethyl na ọkpụkpụ azụ cellulose. A na-eme nke a site na etherification, nke gụnyere imeghachi cellulose na ethylene oxide n'ihu ihe na-eme ka alkaline. Enwere ike ịchịkwa ogo nke etherification iji nweta ihe ndị a chọrọ dị ka viscosity, solubility, na nkwụsi ike okpomọkụ.

4. Neutralization: Mgbe etherification gasịrị, a na-ewepụ ngwaahịa ahụ iji wepụ alkali ọ bụla fọdụrụnụ ma dozie pH na oke kwesịrị ekwesị maka iji ya mee ihe. Enwere ike iji acid dị ka acetic acid ma ọ bụ citric acid mee ịnọpụ iche.

5. Ntucha na ihicha: Nzọụkwụ ikpeazụ bụ nzacha na ihicha nke ngwaahịa HEC a nụchara anụcha. A na-enyochakarị ngwaahịa a iji wepụ adịghị ọcha ọ bụla fọdụrụ wee kpoo ya ka ọ bụrụ ọdịnaya dị mma maka nchekwa na njem.

N'ozuzu, nchacha nke HEC na-agụnye usoro usoro iji mee ka ọ dị ọcha na gbanwee ihe ọkụkụ cellulose iji mepụta polymer dị elu, mmiri na-agbaze mmiri nwere ihe ụfọdụ maka iji ya mee ihe.


Oge nzipu: Mar-20-2023
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