1. Tanthauzo la ulusi wa aramid
Ulusi wa Aramid ndi dzina la ulusi wa polyamide wonunkhira.
2. Kugawa ulusi wa aramid
Ulusi wa Aramid malinga ndi kapangidwe ka mamolekyu ungagawidwe m'mitundu itatu: ulusi wa para-aromatic polyamide, ulusi wa inter-aromatic polyamide, ulusi wa aromatic polyamide copolymer. Pakati pawo, ulusi wa para-aromatic polyamide umagawidwa m'ulusi wa poly-phenylamide (poly-p-aminobenzoyl), ulusi wa poly-benzenedicarboxamide terephthalamide, ulusi wa inter-position benzodicarbonyl terephthalamide umagawidwa m'ulusi wa poly-m-tolyl terephthalamide, ulusi wa poly-N,Nm-tolyl-bis-(isobenzamide) terephthalamide.
3. Makhalidwe a ulusi wa aramid
1. Kapangidwe kabwino ka makina
Interposition aramid ndi polima yosinthasintha, yolimba kuposa polyester wamba, thonje, nayiloni, ndi zina zotero, kutalika kwake ndi kwakukulu, kofewa kukhudza, kozungulira bwino, kumatha kupangidwa kukhala kowonda kosiyana, kutalika kwa ulusi waufupi ndi ulusi, nthawi zambiri makina opangidwa ndi ulusi wosiyanasiyana wolukidwa mu nsalu, nsalu zosalukidwa, zikamalizidwa, kuti zikwaniritse zofunikira za madera osiyanasiyana a zovala zoteteza.
2. Kukana bwino moto ndi kutentha
Chizindikiro cha mpweya wochepa (LOI) cha m-aramid ndi 28, kotero sichimapitiriza kuyaka ikachoka pamoto. Kapangidwe kake ka m-aramid koletsa kuyaka kamadalira kapangidwe kake ka mankhwala, zomwe zimapangitsa kuti ikhale ulusi woletsa kuyaka womwe sumawonongeka kapena kutaya mphamvu zake zoletsa kuyaka pakapita nthawi kapena kutsukidwa. M-aramid imakhala yolimba pa kutentha ndipo ingagwiritsidwe ntchito mosalekeza pa 205°C ndipo imakhala ndi mphamvu zambiri pa kutentha kopitilira 205°C. M-aramid imakhala ndi kutentha kwakukulu ndipo siisungunuka kapena kudontha pa kutentha kwakukulu, koma imayamba kutentha pa kutentha kopitilira 370°C.
3. Kapangidwe ka mankhwala kokhazikika
Kuwonjezera pa ma asidi ndi maziko amphamvu, aramid sikhudzidwa ndi zinthu zosungunulira zachilengedwe ndi mafuta. Mphamvu yonyowa ya aramid ndi yofanana ndi mphamvu youma. Kukhazikika kwa nthunzi yamadzi yokhuta ndikwabwino kuposa kwa ulusi wina wachilengedwe.
Aramid imakhudzidwa kwambiri ndi kuwala kwa UV. Ikayikidwa padzuwa kwa nthawi yayitali, imataya mphamvu zambiri ndipo motero iyenera kutetezedwa ndi gawo loteteza. Gawo loteteza ili liyenera kukhala lotha kuletsa kuwonongeka kwa mafupa a aramid kuchokera ku kuwala kwa UV.
4. Kukana kwa kuwala kwa dzuwa
Kukana kwa radiation kwa ma aramid olumikizana ndi kuwala ndikwabwino kwambiri. Mwachitsanzo, pansi pa 1.72x108rad/s ya r-radiation, mphamvu yake imakhalabe yofanana.
5. Kulimba
Pambuyo potsuka ka 100, mphamvu ya kung'ambika kwa nsalu za m-aramid imatha kufika pa 85% ya mphamvu yake yoyambirira. Kukana kutentha kwa para-aramids kumakhala kokwera kuposa kwa inter-aramids, ndi kutentha komwe kumagwiritsidwa ntchito mosalekeza kuyambira -196°C mpaka 204°C ndipo palibe kuwola kapena kusungunuka pa 560°C. Khalidwe lofunika kwambiri la para-aramid ndi mphamvu yake yayikulu komanso modulus yayikulu, mphamvu yake ndi yoposa 25g/dan, yomwe ndi chitsulo chapamwamba nthawi 5~6, ulusi wagalasi nthawi 3 ndi ulusi wamakampani wa nayiloni nthawi 2; modulus yake ndi ulusi wachitsulo chapamwamba nthawi 2~3 kapena ulusi wagalasi komanso ulusi wamakampani wa nayiloni nthawi 10. Kapangidwe kapadera ka pamwamba pa aramid pulp, komwe kamapezeka ndi kufinya kwa ulusi wa aramid, kamathandizira kwambiri kugwira kwa chophatikizacho ndipo motero ndi koyenera ngati ulusi wolimbitsa zinthu zokangana ndi kutseka. Aramid Pulp Hexagonal Special Ulusi I Aramid 1414 Pulp, wachikasu wopepuka, wofewa, wokhala ndi ma plum ambiri, wamphamvu kwambiri, wokhazikika bwino, wosaphwanyika, wopirira kutentha kwambiri, wosagwira dzimbiri, wolimba, wosachepera kufupika, wokana kukwawa, malo akuluakulu, wolumikizana bwino ndi zinthu zina, cholimbitsa chomwe chimabwezeretsa chinyezi cha 8%, kutalika kwapakati pa 2-2.5mm ndi malo a 8m2/g. Chimagwiritsidwa ntchito ngati chinthu cholimbitsa gasket chokhala ndi mphamvu yabwino komanso magwiridwe antchito otsekera, ndipo sichivulaza thanzi la anthu komanso chilengedwe, ndipo chingagwiritsidwe ntchito potsekera m'madzi, mafuta, asidi ndi alkali. Zatsimikiziridwa kuti mphamvu ya chinthucho ndi yofanana ndi 50-60% ya zinthu zolimbitsa ulusi wa asbestos pamene slurry yochepera 10% yawonjezeredwa. Chimagwiritsidwa ntchito polimbitsa kukwawa ndi kutsekera ndi zinthu zina zopangidwa, ndipo chingagwiritsidwe ntchito m'malo mwa asbestos pazinthu zotsekera kukwawa, pepala loteteza kutentha kwambiri komanso zinthu zolimbitsa.
Nthawi yotumizira: Ogasiti-01-2022