Kev kho kom zoo ntawm Hydroxyethyl cellulose

Hydroxyethyl cellulose(HEC) yog cov dej-soluble polymer uas tau siv dav hauv ntau yam lag luam xws li tshuaj, tshuaj pleev ib ce, thiab zaub mov. HEC yog muab los ntawm cellulose, ib tug natural polymer nyob rau hauv cov nroj tsuag, thiab yog hloov nrog hydroxyethyl pawg los txhim kho nws cov dej solubility thiab lwm yam khoom.

Kev kho kom zoo ntawm HEC suav nrog ntau cov kauj ruam los ntxuav thiab hloov cov polymer kom tau raws li cov kev cai tshwj xeeb rau nws txoj kev siv. Cov hauv qab no yog qee cov kauj ruam uas koom nrog hauv kev kho kom zoo ntawm HEC:

1. Purification: Thawj kauj ruam hauv kev ua kom zoo ntawm HEC yog kev ua kom huv ntawm cov khoom siv cellulose. Qhov no suav nrog kev tshem tawm cov impurities xws li lignin, hemicellulose, thiab lwm yam kab mob uas tuaj yeem cuam tshuam rau qhov zoo thiab cov khoom ntawm cov khoom kawg. Kev lim dej tuaj yeem ua tiav los ntawm ntau txoj hauv kev xws li ntxuav, tshuaj dawb, thiab kho enzymatic.

2. Alkalization: Tom qab purification, cellulose yog kho nrog ib tug alkaline tov kom nws reactivity thiab pab txhawb cov kev taw qhia ntawm hydroxyethyl pawg. Alkalization feem ntau yog ua nrog sodium hydroxide lossis potassium hydroxide ntawm qhov kub thiab txias.

3. Etherification: Cov kauj ruam tom ntej yog kev qhia txog cov pab pawg hydroxyethyl mus rau hauv cov pob txha cellulose. Qhov no yog ua los ntawm etherification, uas cuam tshuam cov cellulose nrog ethylene oxide nyob rau hauv lub xub ntiag ntawm alkaline catalyst. Cov qib ntawm etherification tuaj yeem tswj tau kom ua tiav cov khoom xav tau xws li viscosity, solubility, thiab thermal stability.

4. Neutralization: Tom qab etherification, cov khoom yog neutralized kom tshem tawm cov residual alkali thiab kho cov pH mus rau ib tug haum ntau yam rau nws npaj siv. Neutralization tuaj yeem ua tiav nrog cov kua qaub xws li acetic acid lossis citric acid.

5. Lim thiab ziab: Cov kauj ruam kawg yog kev pom thiab ziab ntawm cov khoom HEC refined. Cov khoom no feem ntau yog lim kom tshem tawm cov impurities seem thiab tom qab ntawd qhuav mus rau cov dej noo tsim nyog rau kev khaws cia thiab kev thauj mus los.

Zuag qhia tag nrho, kev kho kom zoo ntawm HEC suav nrog ntau cov kauj ruam los ntxuav thiab hloov kho cov khoom siv cellulose los tsim cov khoom zoo, dej-soluble polymer nrog cov khoom tshwj xeeb rau nws txoj kev npaj siv.