Cov yas yog hais txog cov ntaub ntawv feem ntau yog ua los ntawm cov resins (lossis monomers polymerized ncaj qha thaum lub sijhawm ua tiav), ntxiv nrog cov khoom ntxiv xws li cov yas, cov khoom sau, cov roj nplua nyeem, thiab cov xim, uas tuaj yeem ua pwm rau hauv cov duab thaum lub sijhawm ua tiav.
Cov Yam Ntxwv Tseem Ceeb ntawm Yas:
① Feem ntau cov yas yog lub teeb yuag thiab ruaj khov tshuaj lom neeg, tiv taus corrosion.
② Kev cuam tshuam zoo heev.
③ Kev pom tseeb zoo thiab kev hnav tsis kam.
④ Cov khoom rwb thaiv tsev nrog cov thermal conductivity tsawg.
⑤ Feem ntau yooj yim rau pwm, xim, thiab ua cov txheej txheem ntawm tus nqi qis.
⑥ Feem ntau cov yas tsis kam cua sov, nthuav dav thermal siab, thiab yooj yim hlawv.
⑦ Qhov tsis ruaj khov ntawm qhov ntev, yooj yim rau kev hloov pauv.
⑧ Ntau cov yas ua haujlwm tsis zoo thaum kub qis, ua rau tawg yooj yim thaum txias.
⑨ Yooj yim rau kev laus.
⑩ Qee cov yas yaj tau yooj yim hauv cov kuab tshuaj.
Cov tshuaj phenolicsiv dav hauv FRP (Fiber-Reinforced Plastic) daim ntawv thov uas xav tau FST (Hluav Taws, Pa Luam Yeeb, thiab Tshuaj Lom). Txawm hais tias muaj qee qhov kev txwv (tshwj xeeb tshaj yog brittleness), phenolic resins tseem yog ib pawg loj ntawm cov resins lag luam, nrog rau kev tsim khoom thoob ntiaj teb txhua xyoo yuav luag 6 lab tons. Phenolic resins muaj kev ruaj khov zoo heev thiab kev tiv thaiv tshuaj lom neeg, tswj kev ruaj khov hauv qhov kub ntawm 150–180 ° C. Cov khoom no, ua ke nrog lawv qhov zoo ntawm kev ua tau zoo, tsav lawv txoj kev siv txuas ntxiv hauv cov khoom FRP. Cov ntawv thov ib txwm muaj xws li cov khoom siv sab hauv dav hlau, cov khoom thauj khoom, cov tsheb ciav hlau sab hauv, cov roj av hauv hiav txwv thiab cov kav dej, cov ntaub ntawv qhov av, cov ntaub ntawv sib txhuam, cov rwb thaiv tsev rocket nozzle, thiab lwm yam khoom cuam tshuam nrog FST.
Cov Hom Phiaj Uas Muaj Fiber Ntau Ntxiv Phenolic Composites
Cov khoom sib xyaw ua ke phenolic uas muaj fiber ntau ntxivsuav nrog cov ntaub ntawv txhim kho nrog cov fibers txiav, ntaub, thiab cov fibers txuas ntxiv. Cov fibers txiav thaum ntxov (piv txwv li, ntoo, cellulose) tseem siv rau hauv cov tshuaj phenolic molding rau ntau yam kev siv, tshwj xeeb tshaj yog cov khoom siv hauv tsheb xws li cov twj tso kua dej thiab cov khoom sib txhuam. Cov tshuaj phenolic molding niaj hnub no suav nrog cov iav fibers, hlau fibers, lossis tsis ntev los no, carbon fibers. Cov phenolic resins siv hauv cov tshuaj molding yog novolac resins, kho nrog hexamethylenetetramine.
Cov ntaub ntawv ua ntej impregnated siv rau hauv ntau yam kev siv, xws li RTM (Resin Transfer Molding), honeycomb sandwich structures, ballistic protection, aircraft interior panels, thiab cargo liners. Cov khoom siv fiber ntau tas mus li yog tsim los ntawm filament winding lossis pultrusion. Npuag thiab tas mus licov khoom sib xyaw ua los ntawm cov fiber ntaufeem ntau siv cov resole phenolic resins uas yaj tau hauv dej lossis cov kuab tshuaj. Dhau li ntawm cov resole phenolics, lwm cov phenolic systems—xws li benzoxazines, cyanate esters, thiab Calidur™ resin tshiab—kuj siv hauv FRP.
Benzoxazine yog ib hom phenolic resin tshiab. Tsis zoo li cov phenolics ib txwm muaj, qhov twg cov ntu molecular txuas nrog ntawm methylene bridges [-CH₂-], benzoxazines tsim cov qauv cyclic. Benzoxazines yooj yim synthesized los ntawm cov ntaub ntawv phenolic (bisphenol lossis novolac), cov amines thawj, thiab formaldehyde. Lawv lub nplhaib-qhib polymerization tsis tsim cov khoom byproducts lossis volatiles, txhim kho qhov ruaj khov ntawm cov khoom kawg. Ntxiv nrog rau qhov kub siab thiab nplaim taws tsis kam, benzoxazine resins qhia txog cov khoom tsis muaj nyob rau hauv cov phenolics ib txwm muaj, xws li kev nqus dej tsawg thiab kev ua haujlwm dielectric ruaj khov.
Calidur™ yog ib tiam tshiab, ib qho khoom siv, ruaj khov polyarylether amide thermosetting resin tsim los ntawm Evonik Degussa rau kev lag luam aerospace thiab electronics. Cov resin no kho tau ntawm 140°C hauv 2 teev, nrog rau qhov kub hloov iav (Tg) ntawm 195°C. Tam sim no, Calidur™ qhia txog ntau yam zoo rau cov khoom sib xyaw ua haujlwm siab: tsis muaj pa phem, tsis tshua muaj exothermic reaction thiab shrinkage thaum kho, muaj zog thermal thiab ntub dej, muaj zog compression thiab shear zoo dua, thiab muaj zog zoo heev. Cov resin tshiab no ua haujlwm ua lwm txoj hauv kev pheej yig rau epoxy, bismaleimide, thiab cyanate ester resins nruab nrab-rau-siab-Tg hauv aerospace, kev thauj mus los, tsheb, hluav taws xob/electronics, thiab lwm yam kev siv.
Lub sijhawm tshaj tawm: Lub Rau Hli-24-2025
