Vim li cas PTFE daim kab xev tuaj yeem tuav nws txoj hlua khi yam tsis muaj qhov tsis ua haujlwm hauv qhov chaw kub kub?

PTFE daim kab xev kub kub uas tsim los ntawm Jiangsu Aokai Cov Khoom Tshiab siv cov nplaum nplaum silicone, uas tuaj yeem ua haujlwm ruaj khov ntawm 250 ° C rau lub sijhawm ntev. Cov laj thawj tseem ceeb nyob hauv peb lub ntsiab lus hauv qab no:

1. Cov saw tseem ceeb muaj Si-O Bonds uas muaj qhov kub thiab txias decomposition kub

Cov saw tseem ceeb molecular ntawm silicone siab-rhiab nplaum nplaum hauv PTFE high-temperature tape muaj Si O Si O qauv. Lub zog ntawm daim ntawv cog lus Si-O yog kwv yees li 445 kJ / mol, ntau dua li C-C daim ntawv cog lus (txog 348 kJ / mol) lossis C-H daim ntawv cog lus (kwv yees 413 kJ / mol) hauv cov organic polymers xws li acrylates thiab rubbers.

Thaum qhov kub thiab txias, C-C daim ntawv cog lus tau yooj yim tawg thiab ua rau cov saw hlau degradation, thaum Si-O daim ntawv cog lus yuav tsum muaj zog ntau dua rau kev tawg. Yog li ntawd, cov saw hlau tseem ceeb ntawm cov silicone PSA tseem nyob ntawm 250 ° C, tsis txhob poob adhesion los ntawm thermal-oxidative degradation.

2. Cov tshuaj sib txuas sib txuas sib txuas tiv thaiv Softening thiab ntws ntawm qhov kub thiab txias

Uncrosslinked silicone roj hmab hloov mus rau hauv cov kua nplaum ntawm qhov kub thiab txias thiab poob tag nrho lub zog cohesive. Txawm li cas los xij, silicone PSA nyob rau hauv PTFE high-temperature daim kab xev yog crosslinked ntawm peroxide crosslinking los yog platinum-catalyzed ntxiv crosslinking, txuas linear molecular chains rau hauv ib tug ruaj khov peb-dimensional network.

Cov qauv crosslinked no tso cai rau cov nplaum nplaum kom muaj kev ywj pheej ntawm 250 ° C yam tsis muaj melting lossis ntws zoo li cov ntaub ntawv thermoplastic. Txawm hais tias muaj qhov txo qis me ntsis hauv cov qauv, nws tseem khaws lub zog cohesive txaus los tiv thaiv tev.

3. Tsawg iav Hloov Kub Kub (Tg ~ -120 ° C)

Silicone PSA nyob rau hauv PTFE high-temperature daim kab xev muaj Tg qis heev (kwv yees li −120 ° C), txhais tau tias nws cov saw hlau molecular tseem nyob rau hauv ib lub xeev elastic heev nyob rau hauv ib tug dav kub ntawm -70 ° C mus rau 300 ° C, es tsis yog ib tug brittle glassy xeev.

Yog li, nyob rau hauv qhov kub thiab txias, cov nplaum txheej tsis hardens kom poob wetting muaj peev xwm los yog softens rau ntau txaus txaus. Nws tuav lub modulus nruab nrab (storage modulus G' ≈ 10⁴–10⁶ Pa), uas yog lub qhov rais zoo tshaj plaws rau lub siab-sensitive adhesion.

Silicone PSA nws tus kheej muaj lub zog nto qis (nyob ib ncig ntawm 22 mN / m), ua kom nws ntub dej qis-nto-zog substrates xws li PTFE thiab silicone roj hmab zoo txawm tias qhov kub thiab txias - tiv thaiv kev cuam tshuam los ntawm qhov tsis zoo ntawm lub zog sib txuam.

Cov ntaub ntawv saum toj no yog muab los ntawm Jiangsu Aokai New Materials Technology Co., Ltd.

Rau cov ncauj lus kom ntxaws, daim ntawv thov scenarios thiab customized kev daws teeb meem ntawm peb cov khoom tag nrho - suav nrog PTFE high-temperature daim ntaub, PTFE high-temperature daim kab xev, PTFE high-temperature mesh siv, seamless siv rau laminating tshuab, ib sab PTFE daim ntaub, high-temperature resistant conveyor siv thiab high-kub vias fibergl.

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Ua raws li kev pabcuam lub tswv yim ntawm kev tshaj lij thiab kev ncaj ncees, peb tau mob siab rau muab koj nrog ib qho kev daws teeb meem thiab kev pabcuam zoo!