Txog Cellulose
Cellulose yog ib hom polysaccharide macromolecular uas muaj glucose. Nws muaj ntau heev nyob rau hauv cov nroj tsuag ntsuab thiab cov tsiaj txhu hauv dej hiav txwv. Nws yog cov khoom siv polymer ntuj loj tshaj plaws thiab muaj ntau tshaj plaws hauv xwm. Nws muaj kev sib raug zoo ntawm cov tsiaj txhu, rov ua dua tshiab thiab lwj tau thiab lwm yam zoo. Los ntawm photosynthesis, cov nroj tsuag tuaj yeem tsim tau ntau pua lab tons ntawm cellulose txhua xyoo.
Kev Xav Tau Daim Ntawv Thov Cellulose
Vim nws cov khoom siv lub cev thiab tshuaj lom neeg, cov cellulose ib txwm muaj kev siv dav dav, thaum cov khoom siv polymer ntuj muaj cov yam ntxwv sib txawv tom qab ua tiav thiab hloov kho, uas tuaj yeem ua tau raws li qhov xav tau ntawm ntau yam lag luam. Kev siv cov khoom siv cellulose tau dhau los ua qhov chaw tshawb fawb thiab kev loj hlob ntawm cov khoom siv polymer.
Cov cellulose derivatives yog tsim los ntawm esterification lossis etherification ntawm hydroxyl pawg hauv cellulose polymers nrog cov tshuaj reagents. Raws li cov yam ntxwv ntawm cov khoom tshuaj tiv thaiv, cellulose derivatives tuaj yeem muab faib ua peb pawg: cellulose ethers, cellulose esters, thiab cellulose ether esters.
1. Cellulose ether
Cellulose ether yog ib lo lus dav dav rau cov cellulose derivatives uas tsim los ntawm cov tshuaj tiv thaiv ntawm alkali cellulose thiab etherifying agent nyob rau hauv qee yam mob. Cellulose ether yog ib hom cellulose derivative nrog ntau hom, cov teb thov dav, cov ntim ntau lawm thiab tus nqi tshawb fawb siab. Nws daim ntawv thov cuam tshuam nrog ntau qhov chaw xws li kev lag luam, kev ua liaj ua teb, kev lag luam tshuaj txhua hnub, kev tiv thaiv ib puag ncig, aerospace thiab kev tiv thaiv lub teb chaws.
Cov cellulose ethers uas siv rau hauv kev lag luam yog: methyl cellulose, carboxymethyl cellulose, ethyl cellulose, hydroxyethyl cellulose, cyanoethyl cellulose, hydroxypropyl cellulose thiab hydroxypropyl methylcellulose Cellulose thiab lwm yam.
2. Cellulose ester
Cellulose esters yog dav siv nyob rau hauv lub teb ntawm kev tiv thaiv lub teb chaws, kev lag luam tshuaj lom neeg, biology, tshuaj, kev tsim kho thiab txawm tias aerospace.
Cov cellulose esters uas siv rau hauv kev lag luam yog: cellulose nitrate, cellulose acetate, cellulose acetate butyrate thiab cellulose xanthate.
3. Cellulose ether ester
Cov cellulose ether esters yog cov ester-ether sib xyaw ua ke.
Daim ntawv thov teb:
1. Kev lag luam tshuaj
Cellulose ether thiab ester derivatives yog siv dav hauv tshuaj rau thickening, excipient, sustained release, controlled release, film forming thiab lwm yam hom phiaj.
2. Txheej teb
Cellulose esters ua lub luag haujlwm tseem ceeb heev hauv kev siv txheej.Cov cellulose esterssiv rau hauv cov binders, cov resins hloov kho lossis cov ntaub ntawv ua ntej zaj duab xis los muab cov txheej txheem nrog ntau yam khoom zoo heev.
3. Kev siv tshuab membrane
Cov khoom siv cellulose thiab cov khoom siv derivative muaj qhov zoo ntawm cov zis loj, kev ua haujlwm ruaj khov, thiab kev siv rov qab tau. Los ntawm kev sib dhos ua ke, txheej txheem inversion, electrospinning technology thiab lwm yam, cov ntaub ntawv membrane nrog kev ua haujlwm sib cais zoo heev tuaj yeem npaj tau. Hauv kev siv tshuab membrane dav dav.
4. Kev tsim kho vaj tse
Cov cellulose ethers muaj lub zog gel thermally reversible thiab yog li ntawd muaj txiaj ntsig zoo li cov khoom ntxiv rau hauv cov khoom siv tsim kho, xws li cov khoom siv nplaum cement-based tile.
5. Kev tsav dav hlau, tsheb fais fab tshiab thiab cov khoom siv hluav taws xob zoo tshaj plaws
Cov ntaub ntawv optoelectronic ua haujlwm raws li cellulose tuaj yeem siv rau hauv aerospace, tsheb fais fab tshiab thiab cov khoom siv hluav taws xob siab.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2024