Aramid yog cov nplaim hluav taws nyob hauv nruab nrab- cov ntaub retardant uas, vim nws qhov tshwj xeeb ntawm lub cev thiab tshuaj lom neeg, ua kom pom kev dav dav hauv ntau qhov chaw. Kuj tseem hu ua aromatic polyamide fiber ntau, nws yog siab -kev ua tau zoo hluavtaws fiber ntau ua los ntawm spinning tshwj xeeb resins. Nws muaj cov qauv molecular tshwj xeeb, suav nrog cov saw ntev uas tsim los ntawm kev sib txuas sib txuas ntawm amide bonds thiab cov nplhaib uas muaj ntxhiab. Raws li qhov sib txawv ntawm cov qauv molecular, aramid feem ntau muab faib rau hauv kev lag luam ua peb hom: meta-aramid (Aramid I, 1313), para-aramid (Aramid II, 1414), thiab heterocyclic aramid (Aramid III). Yog li, dab tsi yog qhov kev siv thiab cov yam ntxwv ntawm aramid?
I. Kev siv Aramid
1. Filaments
2. luv- fiber ntau pulp
3. Ntawv
4. Cov ntaub thiab cov ntaub ntawv sib xyaw
5. Aerospace kev siv
6. Kev siv tub rog
7. Kev thauj mus los
8. Kev sib txuas lus
9. Cov log tsheb
II. Hom ntawm Aramid
1. Ortho-aramid
2. Para-aramid (PPTA)
3. Meta-aramid (PMTA)
III. Qhov zoo ntawm Aramid
Nws muaj cov yam ntxwv tshwj xeeb ntawm kev ua tau zoo, suav nrog lub zog siab, siab modulus, tsis kam mus rau qhov kub thiab txias, nrog rau cov kua qaub thiab alkalis, lub teeb yuag, hluav taws xob rwb thaiv tsev, thiab tiv thaiv kev laus. Tsis tas li ntawd, nws muaj cov qauv tshuaj lom neeg ruaj khov, muaj kev nyab xeeb hauv kev sib tsoo, thiab khav theeb lub neej ua haujlwm ntev.
IV. Disadvantages ntawm Aramid
Nws pom qhov tsis zoo lub teeb nrawm thiab UV tsis kam; nws yog intolerant ntawm muaj zog acids thiab muaj zog alkalis; nws muaj zog compressive tsawg thiab compressive modulus; lub zog sib txuas ntawm fiber ntau - rau - resin interface yog tsawg; nws muaj cov khoom tsis zoo noo noo nqus; thiab nws yog susceptible rau hydrolysis.