Waterborne polyurethane yog ib yam tshiab ntawm polyurethane system uas siv dej es tsis txhob ntawm cov organic solvents raws li ib tug dispersing nruab nrab. Nws muaj qhov zoo ntawm tsis muaj kuab paug, kev nyab xeeb thiab kev ntseeg tau, zoo heev txhua yam khoom, zoo sib xws, thiab kev hloov kho yooj yim.
Txawm li cas los xij, cov ntaub ntawv polyurethane kuj raug kev txom nyem los ntawm cov dej tsis zoo, tiv thaiv tshav kub, thiab cov kuab tshuaj tiv thaiv vim tsis muaj kev sib txuas ruaj khov.
Yog li ntawd, nws yog ib qho tsim nyog los txhim kho thiab ua kom zoo dua cov khoom siv ntawm polyurethane los ntawm kev qhia txog kev ua haujlwm monomers xws li organic fluorosilicone, epoxy resin, acrylic ester, thiab nanomaterials.
Ntawm lawv, nanomaterial hloov polyurethane cov ntaub ntawv tuaj yeem txhim kho lawv cov khoom siv kho tshuab, hnav tsis kam, thiab thermal stability. Cov kev hloov kho muaj xws li intercalation composite method, in-site polymerization method, blending method, thiab lwm yam.
Nano Silica
SiO2 muaj peb-dimensional network qauv, nrog ib tug loj tus naj npawb ntawm active hydroxyl pawg nyob rau hauv nws nto. Nws tuaj yeem txhim kho cov khoom zoo ntawm cov khoom sib xyaw tom qab ua ke nrog polyurethane los ntawm covalent daim ntawv cog lus thiab van der Waals quab yuam, xws li yooj, siab thiab kub tsis kam, kev laus tsis kam, thiab lwm yam. Guo li al. synthesized nano-SiO2 hloov polyurethane siv nyob rau hauv-situ polymerization txoj kev. Thaum SiO2 cov ntsiab lus yog kwv yees li 2% (wt, pawg loj, tib yam hauv qab no), shear viscosity thiab tev lub zog ntawm cov nplaum tau txhim kho. Piv nrog cov ntshiab polyurethane, qhov kub thiab txias tsis kam thiab tensile zog kuj tau nce me ntsis.
Nano Zinc Oxide
Nano ZnO muaj zog txhua yam, zoo antibacterial thiab bacteriostatic zog, raws li zoo raws li lub zog muaj peev xwm nqus infrared tawg thiab zoo UV shielding, ua rau nws haum rau ua cov ntaub ntawv nrog tshwj xeeb zog. Awad et al. siv cov nano positron txoj kev los koom nrog ZnO fillers rau hauv polyurethane. Txoj kev tshawb nrhiav pom tias muaj kev sib cuam tshuam ntawm nanoparticles thiab polyurethane. Ua kom cov ntsiab lus ntawm nano ZnO los ntawm 0 mus rau 5% nce lub iav hloov pauv kub (Tg) ntawm polyurethane, uas txhim kho nws cov thermal stability.
Nano Calcium Carbonate
Kev sib cuam tshuam muaj zog ntawm nano CaCO3 thiab cov matrix ua rau lub zog tensile ntawm cov ntaub ntawv polyurethane. Gao et al. thawj hloov nano-CaCO3 nrog oleic acid, thiab tom qab ntawd npaj polyurethane / CaCO3 los ntawm in-site polymerization. Kev ntsuam xyuas Infrared (FT-IR) tau pom tias cov nanoparticles tau sib cais nyob rau hauv matrix. Raws li kev ntsuas kev ua tau zoo, nws tau pom tias polyurethane hloov nrog nanoparticles muaj zog tensile ntau dua li ntshiab polyurethane.
Graphene
Graphene (G) yog txheej txheej txheej sib koom ua ke los ntawm SP2 hybrid orbitals, uas nthuav tawm cov khoom zoo heev, thermal conductivity, thiab stability. Nws muaj lub zog siab, zoo toughness, thiab yooj yim rau khoov. Wu et al. synthesized Ag / G / PU nanocomposites, thiab nrog rau qhov nce ntawm Ag / G cov ntsiab lus, thermal stability thiab hydrophobicity ntawm cov ntaub ntawv sib txuas txuas ntxiv txhim kho, thiab kev ua haujlwm ntawm cov kab mob kuj nce ntxiv.
Cov pa roj carbon Nanotubes
Cov pa roj carbon nanotubes (CNTs) yog ib-seem tubular nanomaterials txuas nrog hexagons, thiab tam sim no yog ib qho ntawm cov khoom siv nrog ntau yam kev siv. Los ntawm kev siv nws lub zog siab, conductivity, thiab polyurethane composite zog, thermal stability, mechanical zog, thiab conductivity ntawm cov khoom tuaj yeem txhim kho. Wu et al. qhia CNTs los ntawm in-situ polymerization los tswj kev loj hlob thiab tsim ntawm emulsion hais, ua rau CNTs yuav tsum uniformly dispersed nyob rau hauv lub polyurethane matrix. Nrog cov ntsiab lus nce ntawm CNTs, lub zog tensile ntawm cov khoom sib xyaw tau zoo heev.
Peb lub tuam txhab muab cov khoom zoo Fumed Silica,Anti-hydrolysis Agents (crosslinking agents, Carbodiimide), UV absorbers, thiab lwm yam, uas txhim kho kev ua tau zoo ntawm polyurethane.
Post lub sij hawm: Jan-10-2025