Hydroxyethyl cellulose (HEC) bụ ihe na-abụghị ionic cellulose ether nke a na-ejikarị arụ ọrụ, ihe mkpuchi, mmanụ ala, kemịkalụ kwa ụbọchị na ubi ndị ọzọ. Ọ nwere ezi ndim, nkwusioru, dispersion, emulsification, film-akpụ, echebe colloid na ndị ọzọ Njirimara, na bụ ihe dị mkpa thickener na stabilizer.
1. Nkwadebe nke akụrụngwa
Isi akụrụngwa nke hydroxyethyl cellulose bụ cellulose eke. A na-ewepụtakarị cellulose site na osisi, owu ma ọ bụ osisi ndị ọzọ. Usoro mmịpụta nke cellulose dị mfe, ma ọ chọrọ ịdị ọcha dị elu iji hụ na arụmọrụ nke ngwaahịa ikpeazụ. N'ihi nke a, a na-ejikarị ụzọ kemịkalụ ma ọ bụ igwe eme ihe tupu ọgwụgwọ cellulose, gụnyere defatting, de-adịghị ọcha, ịcha ọcha na usoro ndị ọzọ iji wepụ adịghị ọcha na ihe ndị na-abụghị cellulose.
2. Ọgwụgwọ Alkalization
Ọgwụgwọ Alkalization bụ isi ihe na usoro mmepụta nke hydroxyethyl cellulose. Ebumnuche nke usoro a bụ iji mee ka ìgwè hydroxyl (-OH) rụọ ọrụ na agbụ cellulose molecular iji kwado mmeghachi omume etherification na-esote. A na-ejikarị ngwọta sodium hydroxide (NaOH) eme ihe dị ka ihe na-eme ka ihe na-eme ka ọ ghara imebi. Usoro a kapịrị ọnụ bụ: jikọta cellulose na ngwọta sodium hydroxide ka ọ zaa nke ọma ma gbasaa cellulose n'okpuru ọnọdụ alkaline. N'oge a, otu hydroxyl dị na mkpụrụ ndụ cellulose na-arụsi ọrụ ike karị, na-akwado maka mmeghachi omume etherification na-esote.
3. mmeghachi omume etherification
Mmeghachi omume etherification bụ isi nzọụkwụ na mmepụta nke hydroxyethyl cellulose. Usoro a bụ iwebata ethylene oxide (nke a makwaara dị ka ethylene oxide) na cellulose mgbe ọgwụgwọ alkalinization gasịrị, ma meghachi omume na ìgwè hydroxyl dị na mkpụrụ ndụ cellulose iji mepụta hydroxyethyl cellulose. A na-emekarị mmeghachi omume na reactor mechiri emechi, a na-achịkwa okpomọkụ nke mmeghachi omume na 50-100 ° C, na oge mmeghachi omume sitere na ọtụtụ awa ruo ihe karịrị awa iri. Ngwaahịa ikpeazụ nke mmeghachi omume bụ ether nke cellulose hydroxyethylated.
4. Neutralization na ịsacha
Mgbe etherification mmeghachi omume na-agwụ agwụ, ndị reactants na-enwekarị nnukwu ego nke unreacted alkali na site-ngwaahịa. Iji nweta ngwaahịa hydroxyethyl cellulose dị ọcha, a ghaghị ime nkwụsịtụ na ịsa ahụ. Ọtụtụ mgbe, a na-eji acid dilute acid (dị ka dilute hydrochloric acid) mee ihe iji wepụ alkali fọdụrụnụ na mmeghachi omume ahụ, mgbe ahụ, a na-eji mmiri buru ibu na-asa ihe ndị na-eme ihe ugboro ugboro iji wepụ ihe ndị na-adịghị ike na mmiri na-esi na ya pụta. Hydroxyethyl cellulose a sachara dị n'ụdị achicha nzacha mmiri.
5. Mkpọnwụ mmiri na nkụ
Achịcha mmiri mmiri mgbe ịsachara ahụ nwere nnukwu mmiri dị n'ime ya na ọ dị mkpa ka akpọnwụ ya ma kpoo ya iji nweta ngwaahịa hydroxyethyl cellulose ntụ ntụ. A na-arụkarị akpịrị ịkpọ nkụ site na vacuum filtration ma ọ bụ nkewa centrifugal iji wepụ ọtụtụ mmiri. Mgbe nke ahụ gasịrị, a na-eziga achicha mmiri ahụ na akụrụngwa ihicha maka ihicha. Ngwá ọrụ ihicha a na-ahụkarị gụnyere igwe nkụ, igwe nkụ na igwe na-ekpo ọkụ. A na-achịkwa okpomọkụ nke ihicha na 60-120 ℃ iji gbochie oke okpomọkụ site na ịkpata denaturation ngwaahịa ma ọ bụ mmebi arụmọrụ.
6. Egweri na nyocha
Hydroxyethyl cellulose a mịrị amị na-abụkarị nnukwu ngọngọ ma ọ bụ ihe granular. Iji mee ka ojiji dị mfe ma melite mgbasa nke ngwaahịa ahụ, ọ dị mkpa ka a na-agbanye ala na nyocha. Ichicha ihe na-ejikarị igwe igwe na-egweri nnukwu ihe n'ime ntụ ntụ dị mma. Nleba anya bụ ikewapụ ihe ndị na-adịghị ahụkebe nke na-adịghị eru nha nke achọrọ na ntụ ntụ dị mma site na ihuenyo nwere oghere dị iche iche iji hụ na ịdị mma nke ngwaahịa ikpeazụ.
7. Nkwakọ ngwaahịa na nchekwa
Ngwaahịa hydroxyethyl cellulose mgbe egweri na ngebichi nwere ụfọdụ fluidity na dispersibility, nke kwesịrị ekwesị maka ngwa ngwa ma ọ bụ n'ihu nhazi. Ekwesịrị ịkwakọ ngwaahịa ikpeazụ ma chekwaa ya iji gbochie mmiri, mmetọ ma ọ bụ oxidation n'oge njem na nchekwa. A na-ejikarị ihe nkwakọba ihe mkpuchi mmiri na mgbochi oxidation dị ka akpa foil aluminum ma ọ bụ akpa ihe mejupụtara ọtụtụ oyi akwa maka nkwakọ. Mgbe nkwakọchara, a ga-echekwa ngwaahịa ahụ na ebe dị jụụ na nke akọrọ, na-ezere ìhè anyanwụ kpọmkwem na ọnọdụ okpomọkụ dị elu na oke iru mmiri iji hụ na arụmọrụ ya kwụsiri ike.
Usoro mmepụta nke hydroxyethyl cellulose na-agụnye nkwadebe nke akụrụngwa, ọgwụgwọ alkalization, mmeghachi omume etherification, neutralization na ịsacha, akpịrị ịkpọ nkụ na ihicha, egweri na nyocha, na nkwakọ ngwaahịa ikpeazụ na nchekwa. Nzọụkwụ ọ bụla nwere usoro ihe omume pụrụ iche chọrọ na isi ihe nchịkwa. Ọnọdụ mmeghachi omume na nkọwapụta ọrụ kwesịrị ka achịkwa nke ọma n'oge usoro mmepụta iji hụ na ịdị mma na arụ ọrụ kwụsiri ike nke ngwaahịa ahụ. Ihe a na-arụ ọrụ polymer nwere ọtụtụ ngwa na mmepụta mmepụta ihe na ndụ kwa ụbọchị, na-egosipụta mkpa ya na-enweghị atụ.
Oge nzipu: Ọgọst-21-2024