Cia kuv qhia txog SAP uas koj txaus siab rau tam sim no!Super Absorbent Polymer (SAP) yog hom tshiab ntawm cov khoom siv polymer.Nws muaj lub siab nqus dej ua haujlwm uas nqus dej ntau pua mus rau ntau txhiab zaus hnyav dua li nws tus kheej, thiab muaj cov dej tuav tau zoo.Thaum nws nqus dej thiab swells mus rau hauv hydrogel, nws yog qhov nyuaj rau cais cov dej txawm tias nws yog pressurized.Yog li ntawd, nws muaj ntau yam kev siv hauv ntau yam xws li cov khoom siv tu cev, kev lag luam thiab kev ua liaj ua teb, thiab engineering engineering.
Super absorbent resin yog ib hom macromolecules uas muaj pawg hydrophilic thiab cov qauv sib txuas.Nws yog thawj zaug tsim los ntawm Fanta thiab lwm tus los ntawm grafting starch nrog polyacrylonitrile thiab ces saponifying.Raws li cov ntaub ntawv raw, muaj cov hmoov txhuv nplej siab (grafted, carboxymethylated, thiab lwm yam), cellulose series (carboxymethylated, grafted, thiab lwm yam), hluavtaws polymer series (polyacrylic acid, polyvinyl cawv, polyoxy Ethylene series, thiab lwm yam) nyob rau hauv ntau pawg. .Piv nrog cov hmoov txhuv nplej siab thiab cellulose, polyacrylic acid superabsorbent resin muaj cov txiaj ntsig zoo xws li cov nqi qis, cov txheej txheem yooj yim, kev ua haujlwm siab ntau lawm, muaj zog nqus dej, thiab lub neej ntev ntawm cov khoom txee.Nws tau dhau los ua qhov kev tshawb fawb hotspot tam sim no hauv daim teb no.
Lub hauv paus ntsiab lus ntawm cov khoom no yog dab tsi?Tam sim no, polyacrylic acid tso nyiaj rau 80% ntawm lub ntiaj teb super absorbent resin ntau lawm.Lub super absorbent resin feem ntau yog cov polymer electrolyte uas muaj cov pab pawg hydrophilic thiab cov qauv sib txuas.Ua ntej nqus dej, cov saw hlau polymer yog nyob ze rau ib leeg thiab entangled ua ke, cross-linked los tsim ib tug network qauv, thiaj li mus cuag lub zuag qhia tag nrho fastening.Thaum nyob rau hauv kev sib cuag nrog dej, dej molecules nkag mus rau hauv cov resin los ntawm capillary kev ua thiab diffusion, thiab cov ionized pawg ntawm cov saw yog ionized nyob rau hauv dej.Vim lub electrostatic repulsion ntawm tib ions ntawm cov saw hlau, cov saw hlau polymer stretches thiab swells.Vim yog qhov yuav tsum tau muaj hluav taws xob nruab nrab, cov txee ions tsis tuaj yeem txav mus rau sab nraud ntawm cov resin, thiab qhov sib txawv ntawm ion concentration ntawm cov tshuaj hauv thiab sab nraud cov resin ua rau lub siab rov qab osmotic.Nyob rau hauv qhov kev txiav txim ntawm thim rov qab osmosis siab, dej ntxiv nkag mus rau hauv resin los tsim ib hydrogel.Nyob rau tib lub sijhawm, cov qauv sib txuas sib txuas thiab kev sib txuas ntawm hydrogen ntawm cov resin nws tus kheej txwv tsis pub nthuav dav ntawm cov gel.Thaum cov dej muaj cov ntsev me me, qhov rov qab osmotic siab yuav txo qis, thiab tib lub sijhawm, vim muaj cov nyhuv tiv thaiv ntawm lub txee ion, cov saw hlau polymer yuav poob qis, ua rau muaj kev txo qis hauv cov dej nqus dej. cov resin.Feem ntau, lub peev xwm nqus dej ntawm super absorbent resin hauv 0.9% NaCl tov tsuas yog li 1/10 ntawm cov dej deionized.Kev nqus dej thiab kev tuav dej yog ob yam ntawm tib qhov teeb meem.Lin Runxiong et al.tham txog lawv hauv thermodynamics.Nyob rau hauv ib tug tej yam kub thiab siab, lub super absorbent resin nqus dej spontaneously, thiab cov dej nkag mus rau hauv resin, txo cov dawb enthalpy ntawm tag nrho cov system kom txog rau thaum nws mus txog equilibrium.Yog tias dej khiav tawm ntawm cov resin, ua kom cov enthalpy dawb, nws tsis yog qhov zoo rau kev ruaj ntseg ntawm lub cev.Qhov sib txawv thermal tsom xam qhia tau hais tias 50% ntawm cov dej absorbed los ntawm super absorbent resin tseem nyob rau hauv lub gel network saum 150 ° C.Yog li ntawd, txawm hais tias lub siab yog siv rau ntawm qhov kub thiab txias, dej yuav tsis khiav tawm ntawm lub super absorbent resin, uas yog txiav txim los ntawm lub thermodynamic zog ntawm super absorbent resin.
Lwm zaus, qhia lub hom phiaj tshwj xeeb ntawm SAP.
Post lub sij hawm: Dec-08-2021