Hydroxyethylcellulose (HEC) yog non-ionic, dej-soluble polymer muab los ntawm cellulose. Nws yog feem ntau siv nyob rau hauv ntau yam lag luam xws li tshuaj, tshuaj pleev ib ce, khoom noj khoom haus, thiab cov khoom tu tus kheej vim nws thickening, stabilizing, thiab gelling zog.
Chemical Structure ntawm Hydroxyethylcellulose
HEC yog hloov kho cellulose polymer, qhov twg hydroxyethyl pawg tau nkag mus rau hauv cov pob txha cellulose. Qhov kev hloov kho no txhim kho cov dej solubility thiab lwm yam khoom ntawm cellulose. Cov pab pawg hydroxyethyl (-CH2CH2OH) yog covalently bonded rau hydroxyl (-OH) pawg ntawm cellulose molecule. Qhov kev hloov kho no hloov kho lub cev thiab tshuaj lom neeg ntawm cellulose, ua rau nws haum rau ntau yam kev siv.
Flammability yam ntxwv
1. Combustibility
Cov cellulose ntshiab yog cov khoom siv hluav taws xob vim tias nws muaj cov pab pawg hydroxyl, uas tuaj yeem ua rau combustion. Txawm li cas los xij, kev taw qhia ntawm cov pab pawg hydroxyethyl mus rau cov pob txha cellulose hloov nws cov yam ntxwv flammability. Lub xub ntiag ntawm hydroxyethyl pawg tuaj yeem cuam tshuam rau tus cwj pwm sib xyaw ntawm HEC piv rau cov cellulose tsis hloov pauv.
2. Kev kuaj Flammability
Kev ntsuam xyuas Flammability yog qhov tseem ceeb los txiav txim qhov hluav taws kub muaj feem cuam tshuam nrog cov khoom siv. Ntau yam kev ntsuam xyuas, xws li ASTM E84 (Standard Test Method for Surface Burning Characteristics of Building Materials) thiab UL 94 (Standard for Safety of Flammability of Plastic Materials for Parts in Devices and Appliances), yog siv los soj ntsuam cov flammability ntawm cov ntaub ntawv. Cov kev ntsuam xyuas no ntsuas qhov tsis xws li nplaim taws, kev tsim cov pa taws, thiab cov yam ntxwv ntawm qhov hluav taws kub.
Tej yam cuam tshuam rau Flammability
1. Cov ntsiab lus noo noo
Lub xub ntiag ntawm noo noo tuaj yeem cuam tshuam cov nplaim taws ntawm cov ntaub ntawv. Cov ntaub ntawv cellulosic zoo li tsis tshua muaj hluav taws kub thaum lawv muaj cov dej noo ntau dua vim qhov nqus cua sov thiab cov dej txias. Hydroxyethylcellulose, ua dej-soluble, tuaj yeem muaj qhov sib txawv ntawm cov dej noo nyob ntawm ib puag ncig.
2. Particle loj thiab ntom
Qhov loj me me thiab qhov ntom ntawm cov khoom tuaj yeem cuam tshuam nws cov nplaim taws. Finely faib cov ntaub ntawv feem ntau muaj qhov chaw siab dua, uas txhawb kev combustion sai. Txawm li cas los xij, HEC feem ntau yog siv rau hauv cov hmoov los yog granulated daim ntawv uas muaj qhov loj me me kom tau raws li cov ntawv thov tshwj xeeb.
3. Muaj cov tshuaj ntxiv
Hauv kev siv cov tswv yim, hydroxyethylcellulose formulations tej zaum yuav muaj additives xws li plasticizers, stabilizers, los yog nplaim retardants. Cov additives no tuaj yeem hloov cov yam ntxwv flammability ntawm HEC-raws li cov khoom. Piv txwv li, cov nplaim hluav taws kub hnyiab tuaj yeem cuam tshuam los yog ncua qhov hluav taws kub thiab hluav taws kub.
Hluav Taws Xob Hluav Taws Xob thiab Kev Xav Txog Kev Nyab Xeeb
1. Cia thiab tuav
Kev khaws cia kom zoo thiab kev coj ua zoo yog qhov tseem ceeb los txo qhov kev pheej hmoo ntawm hluav taws kub. Hydroxyethylcellulose yuav tsum tau muab cia rau hauv qhov chaw qhuav, qhov cua zoo kom deb ntawm qhov muaj peev xwm ignition. Kev saib xyuas yuav tsum tau ua kom tsis txhob raug tshav kub ntau dhau los yog tshav ntuj ncaj qha, uas tuaj yeem ua rau tawg lossis tawg.
2. Kev Ua Raws Cai
Cov neeg 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 Kev Tswj Xyuas Kev Nyab Xeeb thiab Kev Noj Qab Haus Huv (OSHA) hauv Tebchaws Meskas thiab European Chemicals Agency (ECHA) hauv European Union muab cov lus qhia rau kev nyab xeeb thiab siv tshuaj.
3. Kev Tiv Thaiv Hluav Taws Xob
Nyob rau hauv cov ntaub ntawv ntawm hluav taws muaj hydroxyethylcellulose los yog cov khoom uas muaj HEC, yuav tsum tau siv cov kev ntsuas hluav taws tsim nyog. Qhov no yuav suav nrog kev siv dej, carbon dioxide, tshuaj tua hluav taws qhuav, lossis ua npuas dej, nyob ntawm qhov xwm ntawm qhov hluav taws kub thiab qhov chaw ib puag ncig.
hydroxyethylcellulose yog hloov kho cellulose polymer feem ntau siv nyob rau hauv ntau yam lag luam rau nws thickening thiab stabilizing zog. Thaum cov cellulose ntshiab yog flammable, cov kev taw qhia ntawm hydroxyethyl pawg hloov cov yam ntxwv flammability ntawm HEC. Cov yam ntxwv xws li cov ntsiab lus noo noo, qhov loj me, qhov ntom ntom, thiab muaj cov khoom siv ntxiv tuaj yeem cuam tshuam cov nplaim taws ntawm cov khoom siv hydroxyethylcellulose. Kev khaws cia kom zoo, tuav, thiab ua raws li cov cai tswj kev nyab xeeb yog qhov tseem ceeb los txo cov hluav taws kub hnyiab cuam tshuam nrog HEC. Kev tshawb fawb ntxiv thiab kev sim yuav tsim nyog kom nkag siab txog tus cwj pwm flammability ntawm hydroxyethylcellulose nyob rau hauv cov xwm txheej sib txawv thiab cov qauv.
Post lub sij hawm: Apr-09-2024