Kev tshawb fawb txog kev ua tau zoo ntawm cov dej tsis zoo thiab roj-pov thawj cardboard

Lub hauv paus khoom ntawm cov waterproof thiabroj-pov thawj cardboard siv rau lub thawv ntim khoom noj khoom haus yog ua los ntawm cov tshuaj bleached los ntawm cov txheej txheem tshwj xeeb, thiab tom qab ntawd qhuav tom qab qhov loj me. Txawm hais tias txheej txheej saum npoo tau sizing, qhov roughness tau raug txo, tab sis cov fibers ntawm daim ntawv tseem raug rau ntau pawg polar hydroxyl nrog muaj zog hydrophilicity, siab permeability ntawm daim ntawv thiab capillary phenomenon. cov fibers, cov nyhuv ntawm dej thiab roj infiltration tseem zoo.

oilproof ntawv

Cardboard feem ntau siv txoj hauv kev ntxiv rau hauv cov ntaub so ntswg los yog qhov chaw hloov kho kom muab cov ntawv tshwj xeeb xws li dej tsis zoo, roj pov thawj thiab cov kab mob. Kev hloov kho saum npoo tuaj yeem ua tiav los ntawm txheej txheej txheej. Tom qab ziab, ib zaj duab xis nrog cov khoom thaiv siab yog tsim los txhim kho cov dej tsis zoo thiab cov roj-repellent ntawm daim ntawv; txo lub zog saum npoo tuaj yeem txhim kho cov khoom tiv thaiv ntub dej ntawm lub substrate; npajcoated ntawvNrog rau qee yam khoom thaiv, Los ntawm kev txhim kho nws qhov roughness, cov nyhuv superhydrophobic thiab superoleophobic tuaj yeem tau txais.

zaub mov pob ntawv

Qee cov pab pawg ua haujlwm ntawm chitosan tau hloov los ntawm pawg carboxymethyl los ua carboxymethyl chitosan (CMCS), thiab cov saw molecular muaj ntau cov hydroxyl, amino thiab carboxymethyl ua haujlwm pab pawg, uas ntxiv txhim kho cov dej solubility thiab zaj duab xis-tsim cov khoom ntawm CMCS. Cov pab pawg hydroxyl ntawm CMCS muaj cov polarity muaj zog thiab muaj qee yam tshuaj tiv thaiv rau cov roj, thaum cov amino pawg tau txais txiaj ntsig zoo, uas yuav adsorb cov roj molecules thiab tiv thaiv cov roj molecules los ntawm kev nkag mus thiab ntub cov ntawv.

Polylactic acid (PLA) yog ib qho ntawm cov hotspots hauv kev tshawb fawb ntawm cov ntaub ntawv degradable thoob ntiaj teb, uas daws cov teeb meem uas cov khib nyiab nyuaj rau degrade tom qab siv cov roj av sib txuas. PLA molecules txuas ua ke los ntawm esterification, thiab pab pawg ua haujlwm yog lipophilic, tab sis pawg ester muaj hydrophobicity zoo, yog li PLA tuaj yeem siv los ua cov khoom siv hydrophobic.

CMCS muaj cov roj repellency zoo tab sis muaj zog hydrophilicity, thaum PLA yog insoluble nyob rau hauv dej, thiab cov txheej nyias tsim tom qab txheej txheej muaj cov nyhuv hydrophobic, tab sis cov pab pawg ua haujlwm ntawm cov saw molecular muaj qee yam lipophilicity. Qhov sib piv ntawm ob yog qhov tseem ceeb tshwj xeeb rau kev txhim kho cov dej thiab roj tsis kam ntawmtakeaway ntim khoom noj.

ntim khoom noj

 

 


Post lub sij hawm: Nov-14-2022