Cov txheej txheem los yaj cellulose ether yog dab tsi?

Kev yaj cov cellulose ethers tuaj yeem yog ib kauj ruam tseem ceeb hauv ntau yam lag luam xws li tshuaj, khoom noj, textiles, thiab kev tsim kho.Cov cellulose ethersyog siv dav vim lawv cov khoom xws li thickening, binding, film-forming, thiab stabilizing. Txawm li cas los xij, lawv cov insolubility hauv ntau cov kuab tshuaj feem ntau tuaj yeem ua rau muaj kev cov nyom. Muaj ntau txoj hauv kev tau tsim los yaj cellulose ethers kom zoo.

Cov kuab tshuaj organic:

Cov Cawv: Cov cawv uas muaj qhov hnyav molecular qis dua xws li ethanol, methanol, thiab isopropanol tuaj yeem yaj cov cellulose ethers rau qee qhov. Txawm li cas los xij, lawv yuav tsis haum rau txhua hom cellulose ethers thiab tuaj yeem xav tau qhov kub siab dua.
Cov Khoom Sib Xyaws Ether-Cawv: Cov khoom sib xyaw ntawm diethyl ether thiab ethanol lossis methanol feem ntau siv los yaj cov cellulose ethers. Cov kuab tshuaj no muab kev yaj zoo thiab feem ntau siv rau hauv chaw kuaj mob.
Cov Ketones: Qee cov ketones xws li acetone thiab methyl ethyl ketone (MEK) tuaj yeem yaj qee hom cellulose ethers. Acetone, tshwj xeeb, yog siv dav vim nws tus nqi qis thiab ua haujlwm tau zoo.
Cov Esters: Cov esters xws li ethyl acetate thiab butyl acetate tuaj yeem yaj cov cellulose ethers tau zoo. Txawm li cas los xij, lawv yuav xav tau cua sov kom ua tiav kev yaj tag nrho.

Cov kua dej:

Cov Tshuaj Alkaline: Cellulose ethers tuaj yeem yaj rau hauv cov tshuaj alkaline xws li sodium hydroxide (NaOH) lossis potassium hydroxide (KOH). Cov tshuaj no hydrolyze cov cellulose ethers los ua cov ntsev alkali hlau, uas yaj tau.
Cov Tshuaj Ammonia: Cov tshuaj Ammonia (NH3) kuj tseem siv tau los yaj cov cellulose ethers los ntawm kev tsim cov ntsev ammonium ntawm cov ether.
Cov Tshuaj Hydroxyalkyl Urea: Cov tshuaj Hydroxyalkyl urea, xws li hydroxyethyl urea lossis hydroxypropyl urea, tuaj yeem yaj cov cellulose ethers tau zoo, tshwj xeeb tshaj yog cov uas muaj qib qis dua ntawm kev hloov pauv.

Cov kua dej ionic:

Cov kua ionic yog cov ntsev organic uas yog kua ntawm qhov kub qis, feem ntau qis dua 100 ° C. Qee cov kua ionic tau pom tias yaj cov cellulose ethers tau zoo yam tsis tas yuav muaj xwm txheej hnyav. Lawv muaj cov txiaj ntsig xws li kev hloov pauv tsawg, kev ruaj khov thermal siab, thiab kev siv rov qab tau.

Cov Txheej Txheem Sib Xyaws Ua Los Ntawm Cov Tshuaj Tsw Qab:

Kev sib xyaw ua ke ntawm cov tshuaj yaj sib txawv qee zaum tuaj yeem ua rau cov cellulose ethers yaj tau zoo dua. Piv txwv li, kev sib xyaw dej nrog cov tshuaj yaj sib xws xws li dimethyl sulfoxide (DMSO) lossis N-methyl-2-pyrrolidone (NMP) tuaj yeem txhim kho cov yam ntxwv ntawm kev yaj.
Lub tswv yim Hansen Solubility Parameters feem ntau yog siv los tsim cov txheej txheem sib xyaw ua ke zoo rau kev yaj cov cellulose ethers los ntawm kev xav txog cov txheej txheem solubility ntawm cov kuab tshuaj ib leeg thiab lawv cov kev sib cuam tshuam.

Cov Txheej Txheem Lub Cev:

Kev Txiav Tshuab: Kev sib xyaw ua ke los yog kev sib xyaw ua ke nrog high-shear tuaj yeem pab txhawb kev tawg cov cellulose ethers hauv cov kuab tshuaj thiab txhim kho kev sib xyaw ua ke.
Kev Tswj Kub: Qhov kub siab feem ntau tuaj yeem ua rau cov cellulose ethers yaj tau zoo dua hauv qee cov kuab tshuaj, tab sis yuav tsum ceev faj kom tsis txhob ua rau cov polymer puas tsuaj.

Kev Hloov Kho Tshuaj:

Qee zaum, kev hloov kho tshuaj ntawm cellulose ethers tuaj yeem txhim kho lawv cov khoom solubility. Piv txwv li, kev qhia cov pab pawg hydrophobic lossis nce qib ntawm kev hloov pauv tuaj yeem ua rau cellulose ethers yaj tau ntau dua hauv cov kuab tshuaj organic.

Cov tshuaj Micellar:

Cov tshuaj surfactants tuaj yeem tsim cov micelles hauv cov kua, uas tuaj yeem yaj.cov cellulose ethersLos ntawm kev kho qhov concentration ntawm surfactant thiab cov xwm txheej ntawm cov tshuaj, nws muaj peev xwm yaj cov cellulose ethers tau zoo.
Xaus lus, qhov kev xaiv ntawm txoj kev rau kev yaj cov cellulose ethers nyob ntawm cov yam xws li hom cellulose ether, kev yaj uas xav tau, kev xav txog ib puag ncig, thiab kev siv uas xav tau. Txhua txoj kev muaj nws cov txiaj ntsig thiab kev txwv, thiab cov kws tshawb fawb txuas ntxiv tshawb nrhiav cov hauv kev tshiab los txhim kho kev yaj ntawm cellulose ethers hauv ntau yam kuab tshuaj.