nkhani

1.Aramid fiber zida

Dzina lonse la ulusi wa aramid ndi ulusi wonunkhira wa polyamide.Ndi polima mzere wopangidwa ndi magulu onunkhira komanso magulu a amide.Ili ndi zida zabwino zamakina, mawonekedwe okhazikika amankhwala, makina abwino kwambiri, mphamvu zochulukirapo komanso modulus wapamwamba., kukana kutentha kwambiri, kukana kwa asidi ndi alkali, kulemera kwa thupi, kuvala kukana ndi zina zabwino kwambiri.Zakhala zikugwiritsidwa ntchito kwambiri m'magawo monga zida zoteteza zipolopolo, ndege, zomangamanga ndi zida zamagetsi.

Komabe, fiber ya aramid ilinso ndi zovuta ziwiri zazikulu

(1) Ulusi wa Aramid uli ndi kukana kwa UV.Kuwala kwa ultraviolet (dzuwa) kumayambitsa kuwonongeka kwa ulusi wa aramid.Choncho, chitetezo chotetezera chimafunika, chomwe chingakhale chovala chapamwamba kapena chakuthupi, mwachitsanzo, ulusi wa aramid nthawi zambiri umatsekedwa muchitetezo choteteza.

(2) Fiber ya Aramid imakhala ndi hygroscopicity yapamwamba kwambiri (mpaka 6% ya kulemera kwake), kotero kuti zipangizo za aramid fiber composite ziyenera kutetezedwa bwino, monga topcoats nthawi zambiri amagwiritsidwa ntchito kuchepetsa hygroscopicity.Kuphatikiza apo, kugwiritsa ntchito mitundu ina ya aramid kumachepetsa kuyamwa kwamadzi kwa kompositi ikakumana ndi madzi, monga Kevlar 149 kapena Armos.

2.PE zida za fiber

PE kwenikweni imatanthawuza UHMW-PE, yomwe ndi polyethylene yolemera kwambiri yamamolekyulu.Ndi organic fiber yogwira ntchito kwambiri yomwe idapangidwa kumayambiriro kwa zaka za m'ma 1980.Pamodzi ndi ulusi wa kaboni ndi aramid, umadziwika kuti ndi ulusi waukulu waukadaulo wapamwamba kwambiri padziko lapansi masiku ano.Ili ndi kukhazikika kwapamwamba kwambiri ndipo ndizovuta kwambiri kuipitsa, zomwe zimawononga kwambiri chilengedwe.Koma ndi chifukwa cha chikhalidwe ichi chomwe chimakhala chinthu choyenera kupanga zida za thupi.Kuphatikiza apo, imalimbana ndi kutentha kochepa, kuwala kwa UV, ndi madzi.

Ponena za kupewa zipolopolo zothamanga kwambiri, ntchito ya bulletproof ya PE fiber ndi pafupifupi 30% kuposa ya aramid;pankhani yoletsa zipolopolo zothamanga kwambiri, magwiridwe antchito a PE fiber ndi 1.5 mpaka 2 nthawi ya aramid.Titha kunena kuti zofooka za fiber aramid zakhala zabwino za fiber PE, ndipo zabwino za fiber aramid zakhala zabwinoko pa PE fiber.Chifukwa chake, ndichinthu chosapeŵeka kuti PE fiber ilowe m'malo mwa aramid pantchito yachitetezo.

Zachidziwikire, PE fiber ilinso ndi zofooka.Mulingo wake wokana kutentha ndi wotsika kwambiri poyerekeza ndi fiber ya aramid.Kutentha kogwiritsidwa ntchito kwa zinthu zotetezera fiber PE kuli mkati mwa 70 ° C (zomwe zingathe kukwaniritsa zofunikira za thupi la munthu ndi zipangizo, ndiko kuti, kukana kutentha kwa 55 ° C).Kupitilira kutentha uku, magwiridwe antchito amachepa kwambiri.Pamene kutentha kumapitirira 150 ° C, PE fiber idzasungunuka, ndipo fiber aramid Fiber ikhoza kukhalabe ndi chitetezo chabwino m'malo a 200 ° C, ndipo sichisungunuka kapena kuwonongeka pa 500 ° C;mukakumana ndi kutentha kwambiri kuposa 900 ° C, imapangidwa mwachindunji ndi mpweya kuti ikhale yosanjikiza kutentha.Izi sizipezeka muzinthu zodzitchinjiriza za PE ndipo zakhala zabwino zapadera pazogulitsa za aramid.