Chifukwa Chiyani PTFE Tepi Ingathe Kusunga Kumamatira Kwake Popanda Kulephera M'malo Otentha Kwambiri?

Tepi ya PTFE yotentha kwambiri yopangidwa ndi Jiangsu Aokai New Materials imagwiritsa ntchito zomatira zomata za silicone, zomwe zimatha kugwira ntchito mokhazikika pa 250 ° C kwa nthawi yayitali. Zifukwa zazikulu zagona pa mfundo zitatu izi:

1. Unyolo Waukulu Umakhala ndi Ma Bond a Si-O okhala ndi Kutentha Kwambiri kwa Kuwola kwa Matenthedwe

Unyolo waukulu wa mamolekyu a zomatira zomata za silicone mu tepi yotentha kwambiri ya PTFE ili ndi mawonekedwe a Si O Si O. Mphamvu yomangira ya Si-O chomangira ndi pafupifupi 445 kJ/mol, yokwera kwambiri kuposa chomangira cha C–C (pafupifupi 348 kJ/mol) kapena C–H chomangira (pafupifupi 413 kJ/mol) m’ma polima wamba monga ma acrylates ndi ma raba.

Pakutentha kwambiri, zomangira za C-C zimasweka mosavuta ndikuyambitsa kuwonongeka kwa unyolo, pomwe ma bondi a Si-O amafunikira mphamvu zambiri kuti aduke. Chifukwa chake, unyolo waukulu wamamolekyu wa silicone PSA umakhalabe wokhazikika pa 250 ° C, kupewa kutayika komatira komwe kumachitika chifukwa cha kuwonongeka kwa matenthedwe oxidative.

2. Chemical Cross-Linking Network Imalepheretsa Kufewa ndi Kuyenda pa Kutentha Kwambiri

Rabara ya silikoni yopanda cholumikizira imasandulika kukhala madzi a viscous pa kutentha kwambiri ndikutaya mphamvu zolumikizana. Komabe, silikoni PSA mu PTFE mkulu-kutentha tepi ndi crosslinking kudzera peroxide crosslinking kapena platinamu-catalyzed Kuwonjezera crosslinking, kulumikiza liniya unyolo maselo mu khola azithunzi-thunzi maukonde atatu.

Mapangidwe ophatikizikawa amalola kuti zomatira zikhalebe zotanuka pa 250 ° C popanda kusungunuka kapena kuyenda ngati zida za thermoplastic. Ngakhale ndi kuchepa pang'ono kwa modulus, imakhalabe ndi mphamvu yolumikizana yokwanira kuti ikanize peeling.

3. Kutentha Kwambiri kwa Galasi (Tg ~ −120°C)

Silicone PSA mu PTFE high-temperature tepi ili ndi Tg yotsika kwambiri (pafupifupi -120 ° C), kutanthauza kuti maunyolo ake a molekyulu amakhalabe mumkhalidwe wonyezimira kwambiri pamtunda waukulu wa kutentha kuchokera -70 ° C mpaka 300 ° C, osati mawonekedwe a galasi.

Choncho, pa kutentha kwakukulu, zomatirazo sizimauma kuti zisanyowe kapena kufewetsa kuti zilowe kwambiri. Imasunga modulus yapakatikati (modulus yosungira G' ≈ 10⁴–10⁶ Pa), yomwe ndi zenera labwino kwambiri lomatira movutikira.

Silicone PSA palokha imakhala ndi mphamvu zotsika pamwamba (mozungulira 22 mN/m), zomwe zimathandiza kuti zinyowetse magawo amphamvu otsika kwambiri monga PTFE ndi mphira wa silikoni bwino ngakhale pa kutentha kwambiri - kuletsa kutsekeka komwe kumachitika chifukwa cha kuchepa kwamphamvu kwamphamvu.

Zambiri pamwambapa zimaperekedwa ndi Jiangsu Aokai New Materials Technology Co., Ltd.

Kuti mumve zambiri, mawonekedwe ogwiritsira ntchito ndi mayankho makonda amtundu wathu wonse - kuphatikiza nsalu ya PTFE yotentha kwambiri, tepi ya PTFE yotentha kwambiri, lamba wa PTFE wotentha kwambiri, lamba wopanda waya wamakina opaka utoto, nsalu ya PTFE yokhala ndi mbali imodzi, lamba wotentha kwambiri wosamva kutentha ndi magalasi olumikizirana ndi magalasi - chonde

·  Nambala yafoni yautumiki: Mr. Guo 18944819998 Bambo Liu 13705266308

Kutsatira nzeru zautumiki za ukatswiri ndi kukhulupirika, tadzipereka kukupatsirani mayankho oyimitsa kamodzi ndi ntchito yachidwi!