Njikọ na Njirimara Rheological nke Hydroxyethyl Cellulose Ether

N'ihu nke onye na-eme ka alkali na-eme onwe ya, mmepụta hydroxyethyl A na-emeghachi cellulose na N- (2,3-epoxypropyl) trimethylammonium chloride (GTA) reagent cationization iji kwadebe nnukwu nnọchi nke quaternary ammonium site na usoro nkụ, ụdị nnu Hydroxyethyl cellulose ether.HEC). A na-enyocha mmetụta nke nha nke GTA na hydroxyethyl cellulose (HEC), oke nke NaOH na HEC, mmeghachi omume okpomọkụ, na oge mmeghachi omume na mmeghachi omume mmeghachi omume na-eji atụmatụ nyocha edo edo, na ọnọdụ usoro kachasị mma nwetara site na Monte Monte. Carlo ịme anwansị. Na arụmọrụ mmeghachi omume nke reagent cationic etherification ruru 95% site na nyocha nnwale. N'otu oge ahụ, a tụlere njirimara rheological ya. Nsonaazụ gosiri na ngwọta nkeHEC gosipụtara njirimara nke mmiri mmiri na-abụghị Newtonian, na viscosity ya pụtara ìhè mụbara site na mmụba nke mkpokọta ngwọta ngwọta; na a ụfọdụ ịta nke nnu ngwọta, pụtara viscosity nkeHEC belatara na mmụba nke ntinye nnu agbakwunyere. N'okpuru otu shiee ọnụego, pụtara viscosity nkeHEC na CaCl2 usoro ngwọta dị elu karịa nkeHEC na usoro ngwọta NaCl.

Isi okwu:Hydroxyethylcellulose ether; usoro akọrọ; Njirimara rheological

Cellulose nwere njirimara nke isi mmalite bara ụba, biodegradability, biocompatibility na ntọhapụ dị mfe, ma bụrụ ebe nyocha n'ọtụtụ ebe. Cationic cellulose bụ otu n'ime ihe nnọchianya kachasị mkpa nke ihe ndị sitere na cellulose. N'ime polymer cationic maka ngwaahịa nchedo onwe onye nke CTFA nke Association Industrylọ Ọrụ Na-esi ísì ụtọ debara aha, oriri ya bụ nke mbụ. Enwere ike iji ya mee ihe n'ọtụtụ ihe na-edozi ntutu isi, ihe na-eme ka ọ dị nro, ndị na-eme ihe na-eme ka mmiri na-ekpo ọkụ shale na ndị na-egbochi coagulation ọbara na mpaghara ndị ọzọ.

Ka ọ dị ugbu a, usoro nkwadebe nke quaternary ammonium cationic hydroxyethyl cellulose ether bụ usoro ihe mgbaze, nke na-achọ nnukwu ihe ngwọta nke organic dị oké ọnụ ahịa, dị oke ọnụ, na-adịghị ize ndụ, na-emerụ gburugburu ebe obibi. E jiri ya tụnyere usoro ihe mgbaze, usoro akọrọ nwere uru pụtara ìhè nke usoro dị mfe, nrụpụta mmeghachi omume dị elu, na obere mmetọ gburugburu ebe obibi. N'ime akwụkwọ a, a na-emepụta cationic cellulose ether site na usoro akọrọ ma mụọ omume reological ya.

1. Akụkụ nnwale

1.1 Akụrụngwa na reagents

Hydroxyethyl cellulose (HEC ụlọ ọrụ mmepụta ihe, ya molekụla nnọchi ogo DS bụ 1.8 ~ 2.0); cationization reagent N- (2,3-epoxypropyl) trimethylammonium chloride (GTA), nke a kwadebere site na epoxy chloride Propane na trimethylamine na-eme onwe ya n'okpuru ọnọdụ ụfọdụ; alkali ihe na-eme onwe ya; ethanol na glacial acetic acid dị ọcha nke nyocha; NaCl, KCl, CaCl2 na AlCl3 bụ reagents dị ọcha nke kemịkal.

1.2 Nkwadebe nke quaternary ammonium cationic cellulose

Tinye 5g nke hydroxyethyl cellulose na ego kwesịrị ekwesị nke alkali catalyst nke arụrụ n'ụlọ n'ime cylinder cylindrical steel cylinder nke nwere ihe na-akpali akpali, ma kpalie maka nkeji 20 na ụlọ okpomọkụ; wee tinye a ụfọdụ ego nke GTA, nọgide na-akpali akpali maka 30 nkeji na ụlọ okpomọkụ, na-emeghachi omume na a ụfọdụ okpomọkụ na oge , a siri ike crude ngwaahịa nnoo dabeere na e nwetara. A na-agbanye ngwaahịa crued na ngwọta ethanol nke nwere oke acetic acid kwesịrị ekwesị, kpochara ya, saa ya, ma kpochaa ya iji nweta ntụ ntụ quaternary ammonium cationic cellulose.

1.3 Mkpebi nke obere oke nitrogen nke quaternary ammonium cationic hydroxyethyl cellulose

Ejiri usoro Kjeldahl kpebisie ike na oke nitrogen dị na nlele.

2. Nnwale nyocha na njikarịcha usoro nhazi akọrọ

A na-eji usoro ihe eji eme ihe mee ihe iji chepụta nnwale ahụ, a na-enyochakwa mmetụta nke oke GTA na hydroxyethyl cellulose (HEC), oke nke NaOH na HEC, okpomọkụ mmeghachi omume na oge mmeghachi omume na mmeghachi omume mmeghachi omume.

3. Nnyocha na ihe ndị na-ahụ maka rheological

3.1 Mmetụta nke itinye uche na ọsọ ntụgharị

Na-ewere mmetụta nke shiee ọnụego na pụtara viscosity nkeHEC na mkpokọta dị iche iche Ds=0.11 dịka ọmụmaatụ, enwere ike ịhụ na ka ọnụ ọgụgụ shear ji nwayọọ nwayọọ na-abawanye site na 0.05 ruo 0.5 s-1, viscosity pụtara ìhè.HEC ngwọta na-ebelata, karịsịa na 0.05 ~ 0.5s-1 pụtara viscosity gbadara nke ọma site na 160MPa·s ruo 40MPa·s, mkpari shii, na-egosi naHEC Aqueous ngwọta egosipụtara na-abụghị Newtonian rheological Njirimara. Mmetụta nke nrụgide shiee etinyere bụ iji belata ike mmekọrịta dị n'etiti akụkụ nke akụkụ ahụ gbasasịrị. N'okpuru ọnọdụ ụfọdụ, ka ike dị ukwuu, ka viscosity pụtara ìhè.

Enwere ike ịhụ ya site na viscosities pụtara ìhè nke 3% na 4%HEC Aqueous ngwọta na uka ịta n'otu n'otu bụ 3% na 4% na iche iche shiee ọnụego. Viscosity pụtara ìhè nke ngwọta na-egosi na ikike ya na-abawanye viscosity na-abawanye na ntinye uche. Ihe kpatara ya bụ na ka ntinye uche na-abawanye na usoro ngwọta, mmekọ ọnụ n'etiti ụmụ irighiri ihe nke isi yinye nkeHEC na n'etiti eriri molekụla na-abawanye, na viscosity pụtara ìhè na-abawanye.

3.2 Mmetụta nke ntinye dị iche iche nke nnu agbakwunyere

Ịta nkeHEC edoziri na 3%, na mmetụta nke ịtinye nnu NaCl na viscosity Njirimara nke ngwọta a nyochara na ọkwa dị iche iche.

Enwere ike ịhụ site na nsonaazụ ya na viscosity pụtara ìhè na-ebelata na mmụba nke ntinye nnu agbakwunyere, na-egosi ihe ngosi polyelectrolyte doro anya. Nke a bụ n'ihi na akụkụ nke Na+ na ngwọta nnu na-ejikọta anion nkeHEC yinye akụkụ. Ọnụ ọgụgụ dị ukwuu nke ngwọta nnu, na-abawanye ogo nke neutralization ma ọ bụ ichebe nke polyion site counterion, na mbelata nke electrostatic repulsion, na-eme ka mbelata ụgwọ njupụta nke polyion. , ụdọ polymer na-ebelata na curls, na ntinye uche pụtara ìhè na-ebelata.

3.3 Mmetụta nke nnu dị iche iche agbakwunyere na

Enwere ike ịhụ ya site na mmetụta nke nnu abụọ dị iche iche agbakwunyere, Nacl na CaCl2, na viscosity pụtara ìhè.HEC ihe ngwọta nke na viscosity pụtara ìhè na-ebelata na mgbakwunye nke nnu agbakwunyere, na n'otu nha nha, viscosity pụtara ìhè nkeHEC ihe ngwọta na usoro ngwọta CaCl2 Viscosity pụtara ìhè dị elu karịa nkeHEC ngwọta na NaCl ngwọta usoro. Ihe kpatara ya bụ na nnu calcium bụ ion divalent, ọ dịkwa mfe ijikọta na Cl- nke polyelectrolyte n'akụkụ yinye. Nchikota nke quaternary ammonium otu onHEC na Cl- na-ebelata, na mkpuchi ahụ dị ntakịrị, na njupụta ụgwọ nke ụdọ polymer dị elu, nke na-eme ka ihe mgbapụta electrostatic dị na ụdọ polymer buru ibu, na agbụ polymer na-agbatị, ya mere viscosity pụtara ìhè dị elu.

4. Nkwubi okwu

Nkwadebe akọrọ nke cationic cellulose nke ukwuu nọchiri anya bụ ụzọ nkwadebe dị mma nke na-arụ ọrụ dị mfe, nrụpụta mmeghachi omume dị elu, yana mmetọ dị ntakịrị, ma nwee ike izere oriri ike dị elu, mmetọ gburugburu ebe obibi, na nsị nke ihe mgbaze na-akpata.

Ngwọta nke cellulose cationic cellulose ether na-enye njirimara nke mmiri mmiri na-abụghị Newtonian ma nwee njirimara nke ịcha ntutu; ka ihe ngwọta uka ntinye uche na-abawanye, viscosity ya pụtara ìhè na-abawanye; N'ime ntakịrị ihe ngwọta nnu,HEC viscosity pụtara ìhè na-abawanye na mmụba na mbelata. N'okpuru otu shiee ọnụego, pụtara viscosity nkeHEC na CaCl2 usoro ngwọta dị elu karịa nkeHEC na usoro ngwọta NaCl.