Usoro mmepụta nke ultra-high viscosity sodium carboxymethyl cellulose

1. General ụkpụrụ nke CMC mmepụta

(1) Oke oriri (usoro mgbaze, gbakọọ kwa ton nke ngwaahịa): litter owu, 62.5kg; ethanol, 317.2kg; alkali (44.8%), 11.1kg; monochloroacetic acid, 35.4 n'arọ; toluene, 310.2 n'arọ,

(2) Ụkpụrụ mmepụta na usoro? A na-eme cellulose alkaline site na cellulose na sodium hydroxide aqueous solution ma ọ bụ sodium hydroxide aqueous ethanol ngwọta, wee meghachi omume na monochloroacetic acid ma ọ bụ sodium monochloroacetate iji nweta ngwaahịa crude, na alkaline ngwaahịa akpọnwụwo, Pulverized n'ime azụmahịa dị carboxymethyl cellulose (sodium nnu vine). ). A na-ewepụsị ngwaahịa ahụ crued, saa ya, wepụ sodium chloride, wee kpoo ya ma gwerie ya iji nweta sodium carboxymethyl cellulose a nụchara anụcha. Usoro kemịkalụ bụ nke a:

(C6H9O4-OH)4+nNaOH-(C6H9O4-ONa)n+nH2O

(3) Nkọwa usoro

A na-egweri cellulose ma kwụsịtụ na ethanol, gbakwunye lye na mmiri ozuzo 30 n'okpuru mkpali mgbe niile, debe ya na 28-32.°C, dị jụụ na obere okpomọkụ, tinye monochloroacetic acid, kpoo ruo 55°C maka 1.5h ma meghachi omume maka 4h; tinye acetic acid ka ọ ghara imebi ngwakọta mmeghachi omume , A na-enweta ngwaahịa crude site na ikewa ihe mgbaze ahụ, a na-asachakwa ngwaahịa crude ugboro abụọ na mmiri methanol n'ime ngwa ịsa ahụ nke mejupụtara mixer na centrifuge, ma kpoo ya iji nweta ngwaahịa ahụ.

Ihe ngwọta CMC nwere nnukwu viscosity, na mgbanwe okpomọkụ agaghị eme ka gelation.

2. Usoro mmepụta nke ultra-high viscosity sodium carboxymethyl cellulose

  Usoro mmepụta nke ultra-high viscosity sodium carboxymethyl cellulose.

nzọụkwụ:

(1) Tinye cellulose, alkali na ethanol n'ime alkalization kneader n'ike-n'ike na-ebu alkalization n'okpuru nchebe nke nitrogen, na mgbe ahụ na-etinye na etherifying gị n'ụlọnga chloroacetic acid ethanol ngwọta ibido etherify ihe;

(2) Bufee ihe ndị dị n'elu n'ime kneader etherification iji chịkwaa okpomọkụ na oge mmeghachi omume maka mmeghachi omume etherification, ma bufee ihe ndị ahụ na tankị ịsa ahụ mgbe emechara mmeghachi omume etherification;

(3) Na-asa ihe mmeghachi omume etherification na ngwọta ethanol dilute iji wepụ nnu sitere na mmeghachi omume ahụ, ka ịdị ọcha nke ngwaahịa ahụ nwee ike iru karịa 99.5%;

(4) Mgbe ahụ, a na-etinye ihe ahụ na ịpị centrifugal, a na-ebugakwa ihe siri ike na onye na-agbapụta ihe, na ihe mgbaze ethanol na-esi na ihe ahụ na-esi na ya pụta;

(5) Ihe a na-agafe na onye na-agbapụ na-abanye n'àkwà mmiri na-ama jijiji maka ihicha iji wepụ oke mmiri, wee gwepịa ya iji nweta ngwaahịa ahụ. Uru ya bụ na usoro ahụ zuru oke, njirimara njirimara ngwaahịa nwere ike iru viscosity nke 1% B ụdị> 10000mpa.s, na ịdị ọcha> 99.5%.

  Carboxymethyl cellulose bụ ihe nrụpụta nke nwere usoro ether nwetara site na mgbanwe kemịkalụ nke cellulose eke. Otu carboxyl na agbụ molekụla nwere ike ịmepụta nnu. Nnu a na-ahụkarị bụ nnu sodium, ya bụ sodium carboxymethyl cellulose (Na -CMC), nke a na-akpọkarị CMC, bụ ionic ether. CMC bụ ntụ ntụ dị elu nke na-acha ọcha, na-acha ọcha ma ọ bụ na-acha odo odo n'ọdịdị, enweghị ụtọ, enweghị isi, adịghị egbu egbu, ọkụ na-adịghị ere ọkụ, na-adịghị amị amị, ma kwụsie ike na ọkụ na okpomọkụ.