Silicone PSA Pambuyo Kukalamba Kwambiri Kutentha: Kulimba kwa Peel ndi Kugwirizana ndi Gulu

Pamene a Tepi yomatira ya PTFE yotentha kwambiri imagwiritsidwa ntchito kumalo otentha - kunena, 200 ° C kwa masabata kapena miyezi - zomatira za silicone zopanikizika (PSA) zimatha kusintha. Mphamvu ya peel imatha kukwera, kugwa, kapena kusamutsa zotsalira. Kugwirizana kumatha kuwonjezereka (kuwonongeka) kapena kuchepa (kulephera kogwirizana).

Sikuti onse a silicone PSA amachita chimodzimodzi. Kusiyanaku kumabwera ku mapangidwe a polima (methyl vs. methylphenyl), njira yodutsa (peroxide vs. mankhwala owonjezera), ndi chiŵerengero cha MQ resin ku rabala.

Aokai PTFE imagwiritsa ntchito magiredi angapo a silicone PSA m'matepi athu. Bukhuli likufotokoza zomwe zimachitika pakusenda mphamvu ndi mgwirizano pambuyo pokalamba kutentha kwambiri pagiredi iliyonse, komanso momwe mungasankhire yoyenera pakugwiritsa ntchito kwanu.

Zomwe Zimachitikira Silicone PSA Pakutentha - Njira ziwiri Zolephera

Akakalamba kutentha kwambiri (200-250 ° C), silicone PSAs amatha kusintha ziwiri zotsutsana:

1. Post-crosslinking (kumabweretsa brittleness)

Magulu ogwira ntchito osakhudzidwa akupitilizabe kuchitapo kanthu, ndikuwonjezera kuchuluka kwa ma crosslink. Mphamvu ya peel yoyamba imatha kukwera kwakanthawi, kenako ndikugwa kwambiri ngati zomatira zimakhala zolimba kwambiri. Mphamvu yometa ubweya wa static ikuwoneka kuti ikuwonjezeka, koma kugwira mphamvu ndi kukana kwamphamvu kumachepa. Filimu yomatira imakhala yolimba komanso imasweka.

2. Kuwonongeka kwa msana (kumabweretsa kutaya ndi zotsalira)

Msana wa polydimethylsiloxane umadutsa cyclization ndi chain scission. Mphamvu ya peel imatsika mosalekeza. Zomatira zimatha kusamutsa ku gawo lapansi (zotsalira) kapena kulephera mogwirizana. Izi ndizofala m'ma PSA otsika a methyl silicone.

Zosintha zazikulu zosinthira:

• Phenyl (zapamwamba = kukana kutentha kwabwino)

• Kuchulukana kwa Crosslink ndi mtundu wochiritsa (mankhwala owonjezera motsutsana ndi machiritso a peroxide)

• Kuchuluka kwa utomoni wa MQ ku rabara ya silikoni

Magulu a Gulu ndi Chemical Structure

1. Standard polydimethylsiloxane (methyl-type silikoni PSA)

• Kusunga peel utatha kukalamba (200-250 ° C): Mphamvu ya peel imakwera pang'ono poyamba, kenako imachepa. Pambuyo masiku 7 pa 250 ° C, kusunga peel ndi 50-70% yokha . Kuchita kumatsika mofulumira pa kutentha kwakukulu. Kuwonongeka kumachokera ku cyclization ya dimethyl siloxane msana.

• Kukhazikika kwa mgwirizano: Matembenuzidwe ochiritsidwa ndi peroxide (mwachitsanzo, KR-101) ali ndi zoyambitsa zotsalira zomwe zimayambitsa kusalamuliridwa pambuyo pochiritsa - zomatira zimauma ndi kuphulika. Mphamvu ya kukameta ubweya woyambirira imayenda bwino, koma kugwira mphamvu kumatsika, ndipo kulephera kogwirizana kumachitika pakutentha. Matembenuzidwe ochiritsira owonjezera ndi abwinoko pang'ono koma akadali ochepa chifukwa chakusauka kwachilengedwe kwa kutentha kwa msana wa dimethyl.

2. Methylphenyl polysiloxane (kalasi yolimbana ndi kutentha kwambiri)

• Kusungidwa kwa peel utakalamba: Unyolo wam'mbali wa Phenyl umasokoneza kulongedza kwa magawo a dimethyl ndikuchepetsa kuwonongeka kwa cyclization. Pambuyo pa masiku 7 pa 250 ° C, kusunga mphamvu kwa peel kumaposa 85% . Mapangidwe apamwamba a phenyl amakhalabe ndi peel yokhazikika ngakhale pa 260-288 ° C.

• Kukhazikika kwa mgwirizano: Zabwino kwambiri. Kumeta ubweya wa mphamvu kumasintha pang'ono; kusunga mphamvu kupitirira 80%. Zomatira zosanjikiza zimakhalabe zosinthika kwa nthawi yayitali popanda embrittlement kapena zotsalira. Magiredi owonjezera ochiritsidwa a phenyl apamwamba ndi silicone PSA yokhazikika yamafuta.

3. Special high-peel ndi otsika peel mwambo sukulu

• Magiredi apamwamba kwambiri (mwachitsanzo, Dow 7385, peel yodziwika> 10N/25mm): Kutsitsa kwa utomoni wapamwamba wa MQ kumapereka mphamvu zoyambira komanso zolimba za peel, koma pamtengo wa kukana kutentha ndi kukhazikika kwa mgwirizano. Amawonetsa kutsika kwakukulu kwa peel akakalamba ndipo amakonda kutsalira chifukwa cha kuwonongeka kwa utomoni. Gwiritsani ntchito pakanthawi kochepa kutentha.

• Mafilimu odzitchinjiriza otsika, ogwirizana kwambiri: Kuchulukirachulukira kwakukulu kumapereka mawonekedwe okhazikika a peel komanso kukhazikika kwaukalamba, koma kutsika koyambirira. Akakalamba, amakhalabe ogwirizana koma amaumitsidwa, kumachepetsa kugwirizana ndi malo ovuta.

Crosslinking Mechanism – Peroxide vs. Addition Cure (Same Methyl Base)

Ngakhale ndi methyl polima yomweyo, njira yochiritsa imasintha kwambiri ukalamba.

1. Peroxide-ochiritsidwa (m'badwo woyamba)

• Peroxide yotsalira imayambitsa kusagwirizana kwapambuyo pa ukalamba wotentha kwambiri.

• Peel mphamvu spikes poyamba, kenako kugwa kwambiri.

• Kugwirizana kumakwera kwakanthawi, ndikutsatiridwa ndi kugwedezeka ndikugwira kulephera kwa mphamvu.

• Kusasinthasintha kukalamba kwa batch-to-batch ndikovuta.

2. Kuwonjezera-kuchiritsidwa (kuchiritsa hydrosilylation)

• Kuchiritsa kumapanga palibe zotulukapo; crosslink network ndiyotheka kuwongolera.

• Kusintha kwa katundu pambuyo pa ukalamba kumatsatira njira yodziwikiratu.

• Kusungirako kwapamwamba kwambiri kwa peel ndi kukhazikika kwa mgwirizano poyerekeza ndi mapangidwe a peroxide.

Chitsogozo Chosankha Makalasi

Malingaliro a Aokai PTFE : Pa tepi iliyonse ya PTFE yomwe idzawona kutentha kosalekeza pamwamba pa 200 ° C, tchulani kuwonjezera-kuchiritsidwa methylphenyl silikoni PSA. Mtengo wakutsogolo ndi wokwera, koma umalepheretsa kulephera kwamunda chifukwa cha zotsalira zomatira kapena kutayika kwa ma bond.

Chidule Chachidule - Kufananiza Silicone PSA Kalasi ndi Kufuna Kwamafuta

• Silicone yamtundu wa Methyl PSA (makamaka yochiritsidwa ndi peroxide) ndiyoyenera kugwiritsidwa ntchito pakanthawi kochepa kapena kocheperako. Pambuyo pa masiku 7 pa 250 ° C, yembekezerani 30-50% kutayika kwa peel ndi zotheka kusokoneza.

• Silicone ya Methylphenyl (high-phenyl) PSA imasunga> 85% mphamvu ya peel ndi mgwirizano wosinthika pambuyo pa ukalamba womwewo. Ndi kusankha kwa 200-250 ° C mosalekeza.

• Njira yolumikizirana ndiyofunika kwambiri: kuchiritsa kowonjezera (hydrosilylation) ndikokhazikika kuposa kuchiritsa kwa peroxide.

• Magiredi apamwamba amasinthanitsa kukhazikika kwa ukalamba kuti ayambirenso - apeweni pamapulogalamu otentha.

Pofuna kulumikiza kutentha kwambiri, Aokai PTFE imagwiritsa ntchito ma PSA a methylphenyl silicone owonjezera. Titha kupereka deta yosunga peel pambuyo pa 1000h pa 250 ° C tikapempha.

Zaukadaulo zoperekedwa ndi Malingaliro a kampani Jiangsu Aokai New Materials Technology Co., Ltd.

Kuti mudziwe zambiri zamakina aukadaulo ndi njira zothetsera PTFE nsalu zotentha kwambiri, matepi, malamba a mauna, ndi zina zambiri:

• Bambo Guo: +86 18944819998

• Bambo Liu: + 86 13705266308

Kutsatira ukatswiri ndi umphumphu, timapereka mayankho okhazikika amodzi ndi ntchito zoganizira pambuyo pogulitsa.