Hydroxyethylcellulose (HEC) yog ib qho polymer uas tsis yog ionic, yaj tau hauv dej los ntawm cellulose. Nws feem ntau siv rau hauv ntau yam lag luam xws li tshuaj, tshuaj pleev ib ce, khoom noj, thiab cov khoom siv tu tus kheej vim nws cov khoom ua kom tuab, ruaj khov, thiab gelling.
Cov Qauv Tshuaj ntawm Hydroxyethylcellulose
HEC yog ib qho cellulose polymer uas tau hloov kho, qhov twg cov pab pawg hydroxyethyl tau nkag mus rau hauv cellulose backbone. Qhov kev hloov kho no ua rau cov dej solubility thiab lwm yam khoom ntawm cellulose zoo dua. Cov pab pawg hydroxyethyl (-CH2CH2OH) yog cov sib txuas ua ke rau cov pab pawg hydroxyl (-OH) ntawm cov cellulose molecule. Qhov kev hloov kho no hloov cov khoom siv lub cev thiab tshuaj ntawm cellulose, ua rau nws haum rau ntau yam kev siv.
Cov yam ntxwv ntawm kev kub hnyiab
1. Kev kub hnyiab
Cov cellulose ntshiab yog cov khoom siv uas yooj yim hlawv vim nws muaj cov hydroxyl pawg, uas tuaj yeem hlawv tau. Txawm li cas los xij, qhov kev qhia txog hydroxyethyl pawg rau ntawm cellulose backbone hloov nws cov yam ntxwv flammability. Qhov muaj cov hydroxyethyl pawg tuaj yeem cuam tshuam rau tus cwj pwm combustion ntawm HEC piv rau cov cellulose tsis hloov kho.
2. Kev Ntsuas Kev Kub Hnyiab
Kev ntsuam xyuas kev kub hnyiab yog qhov tseem ceeb heev rau kev txiav txim siab txog kev phom sij ntawm hluav taws uas cuam tshuam nrog cov khoom siv. Ntau yam kev ntsuam xyuas tus qauv, xws li ASTM E84 (Txoj Kev Ntsuas Tus Qauv rau Cov Yam Ntxwv Kub ntawm Cov Khoom Siv Hauv Tsev) thiab UL 94 (Tus Qauv rau Kev Nyab Xeeb ntawm Kev Kub Hnyiab ntawm Cov Khoom Siv Yas rau Cov Khoom Siv thiab Cov Khoom Siv), yog siv los ntsuas qhov kub hnyiab ntawm cov khoom siv. Cov kev ntsuam xyuas no ntsuas cov yam ntxwv xws li kev sib kis hluav taws, kev loj hlob ntawm pa luam yeeb, thiab cov yam ntxwv ntawm kev kub hnyiab.
Cov Yam Cuam Tshuam Rau Kev Kub Hnyiab
1. Cov ntsiab lus noo noo
Qhov muaj dej noo tuaj yeem cuam tshuam rau qhov ua rau cov khoom siv hluav taws kub. Cov khoom siv cellulosic feem ntau tsis yooj yim hlawv thaum lawv muaj cov dej noo ntau dua vim yog qhov dej nqus cua sov thiab txias. Hydroxyethylcellulose, uas yaj tau hauv dej, yuav muaj cov dej noo sib txawv nyob ntawm seb ib puag ncig zoo li cas.
2. Qhov Loj thiab Qhov Ceev ntawm Cov Khoom Me Me
Qhov loj me thiab qhov ceev ntawm cov khoom siv tuaj yeem cuam tshuam rau nws qhov kev kub hnyiab. Cov ntaub ntawv faib ua feem ntau muaj thaj chaw siab dua, uas txhawb kev kub hnyiab sai dua. Txawm li cas los xij, HEC feem ntau yog siv rau hauv daim ntawv hmoov lossis granulated nrog cov khoom me me tswj tau kom ua tau raws li cov kev xav tau ntawm daim ntawv thov tshwj xeeb.
3. Muaj Cov Khoom Ntxiv
Hauv kev siv ua haujlwm, cov qauv hydroxyethylcellulose yuav muaj cov khoom ntxiv xws li cov yas, cov khoom ruaj khov, lossis cov khoom tiv thaiv hluav taws. Cov khoom ntxiv no tuaj yeem hloov pauv cov yam ntxwv ntawm cov khoom HEC. Piv txwv li, cov khoom tiv thaiv hluav taws tuaj yeem tswj lossis ncua qhov hluav taws thiab kis ntawm cov nplaim taws.
Kev Phom Sij Hluav Taws thiab Kev Xav Txog Kev Nyab Xeeb
1. Kev Khaws Cia thiab Kev Ua Haujlwm
Kev khaws cia thiab kev siv kom zoo yog qhov tseem ceeb kom txo qhov kev pheej hmoo ntawm hluav taws. Hydroxyethylcellulose yuav tsum khaws cia rau hauv qhov chaw qhuav, muaj cua nkag zoo kom deb ntawm cov chaw uas yuav ua rau muaj hluav taws kub. Yuav tsum ceev faj kom tsis txhob raug cua sov ntau dhau lossis tshav ntuj ncaj qha, uas yuav ua rau lwj lossis kub hnyiab.
2. Kev Ua Raws Cai
Cov chaw tsim khoom thiab cov neeg siv cov khoom uas muaj hydroxyethylcellulose yuav tsum ua raws li cov cai thiab cov qauv kev nyab xeeb. Cov koom haum tswj hwm xws li Occupational Safety and Health Administration (OSHA) hauv Tebchaws Meskas thiab European Chemicals Agency (ECHA) hauv European Union muab cov lus qhia rau kev siv thiab kev siv tshuaj lom neeg kom muaj kev nyab xeeb.
3. Kev Tswj Hluav Taws Kub
Yog tias muaj hluav taws kub uas muaj hydroxyethylcellulose lossis cov khoom uas muaj HEC, yuav tsum muaj kev tswj hluav taws kom zoo. Qhov no suav nrog kev siv dej, carbon dioxide, cov tshuaj tua hluav taws qhuav, lossis ua npuas dej, nyob ntawm seb qhov hluav taws kub thiab ib puag ncig zoo li cas.
hydroxyethylcellulose yog ib qho polymer cellulose hloov kho uas feem ntau siv hauv ntau yam lag luam rau nws cov khoom thickening thiab stabilizing. Txawm hais tias cellulose ntshiab yog flammable, qhov kev qhia txog hydroxyethyl pawg hloov pauv cov yam ntxwv flammability ntawm HEC. Cov yam xws li cov dej noo, qhov loj me me, qhov ceev, thiab qhov muaj cov additives tuaj yeem cuam tshuam rau qhov flammability ntawm hydroxyethylcellulose-muaj cov khoom. Kev khaws cia, kev tuav, thiab kev ua raws li cov cai kev nyab xeeb yog qhov tseem ceeb los txo cov teeb meem hluav taws uas cuam tshuam nrog HEC. Kev tshawb fawb ntxiv thiab kev sim yuav tsum tau ua kom nkag siab tag nrho cov cwj pwm flammability ntawm hydroxyethylcellulose nyob rau hauv ntau yam mob thiab cov qauv.
Lub sijhawm tshaj tawm: Plaub Hlis-09-2024