Yadda Silicone Adhesive Tg Ya Shafi Ayyukan Tef na PTFE a Ƙananan Zazzabi

Shin kun taɓa ƙoƙarin amfani da tef na yau da kullun a cikin injin daskarewa? Yana yin tauri, yana rasa mannewa, kuma yana fashe idan lanƙwasa. Domin PTFE high-zazzabi tef da aka yi amfani da shi a cikin ƙananan yanayin zafi - daga ajiyar sanyi zuwa bututun cryogenic - madaidaicin gilashin gilashin manne (Tg) ya sa duk bambanci.

Silicone matsa lamba-manne m yana da matuƙar ƙarancin Tg na kusan -120°C . Wannan shine ainihin dalilin da ya sa tef ɗin PTFE ya kasance mai sassauƙa da mannewa a yanayin zafi ƙasa da -70 ° C.

Aokai PTFE yayi nazarin wannan kadarar sosai. Wannan labarin ya bayyana kimiyyar da ke bayan Tg da kuma yadda yake shafar aikin tef a cikin yanayin sanyi.

Menene Canjin Canjin Gilashin (Tg) kuma Me yasa Yayi Mahimmanci?

Yanayin canjin gilashin (Tg) shine ma'anar da polymer ke canzawa daga yanayi mai laushi, mai laushi zuwa mai wuya, yanayin gilashi . Lokacin da zafin jiki ya faɗi ƙasa da Tg, sarƙoƙin ƙwayoyin cuta na polymer suna daskare, suna rasa ruwa da ikon mannewa.

Don adhesives masu matsi:

• Sama da Tg: Sarƙoƙi suna motsawa cikin yardar rai → mannewa yana tsayawa taushi, mai ɗaki, kuma yana iya jika saman ƙasa

• A ƙasa Tg: Sarƙoƙi suna daskarewa → m

Me yasa PSA silicone ta musamman ce: Tg na -120°C yana da ƙasa sosai idan aka kwatanta da adhesives na acrylic (Tg a kusa da -20°C zuwa -30°C). Wannan yana nufin silicone ya kasance mai ƙarfi da ɗanɗano a cikin kewayon zafin jiki mai faɗi - daga -70 ° C har zuwa 260 ° C.

Dangantakar da ke tsakanin Tg da aikin mannewa ba mai sauƙin kunnawa/kashewa bane. Ko da 30 ° C sama da Tg, motsin kwayoyin har yanzu yana iyakance; manne zai iya zama 'fata' maimakon cikakken rubbery. Don aikace-aikacen tef ɗin PTFE da ke ƙasa -50 ° C, manne dole ne ya kula da modules 'rubbery plateau' tsakanin 10⁴ da 10⁶ Pa. Silicone PSA ya cimma wannan har zuwa kusan -80°C saboda sassauƙar ƙashin bayan siloxane ɗin sa (–Si–O–Si–). Adhesives na acrylic, tare da kashin bayan carbon-carbon, yawanci suna rasa takin ƙasa -30 ° C. Wannan yana bayyana dalilin da yasa kaset PTFE na tushen silicone kawai aka ba da shawarar don aikace-aikacen injin daskarewa (-30°C zuwa 0°C) ko muhallin cryogenic.

Makarantun Tasirin Tasirin Tg akan Tef ɗin PTFE

A overall low-zazzabi yi na PTFE high-zazzabi tef an hade m Layer da PTFE substrate . PTFE kanta kuma tana da Tg na kusan -120°C – mai kama da silicone PSA.

Maɓalli mai mahimmanci: Muddin zafin sabis ɗin ya tsaya a sama da Tg (misali, -70 ° C, wanda shine 50 ° C sama da -120 ° C), duka biyun da mannewa da ma'auni suna kasancewa a cikin yanayi mai ƙarfi sosai, yana ba da garantin ingantaccen sassaucin yanayin zafi da kwanciyar hankali.

Aokai PTFE's thermal analysis lab ya tabbatar da cewa silicone PSA yana kula da sama da 80% na ƙarfin bawon ɗaki a -70 ° C, yayin da acrylic PSA ya rasa fiye da 90% ƙasa -30 ° C. Wannan bayanan ya yi daidai da bambancin Tg.

A cikin ainihin amfani da cryogenic (misali, tef ɗin abin rufe fuska don fesa plasma mai ƙarancin zafin jiki ko gyare-gyaren wucin gadi a cikin ruwa nitrogen dewars), masu amfani galibi suna kuskuren zargi fim ɗin PTFE don fashe lokacin da ainihin mai laifi shine m. Lokacin da mannen ya daskare a ƙasan Tg ɗinsa, ya rasa yarda kuma ba zai iya ɗaukar damuwa na lanƙwasawa ba. Sa'an nan nau'in yana canjawa zuwa ma'aunin PTFE, wanda har yanzu yana iya kasancewa mai sassauƙa, amma taurin Layer na manne yana aiki azaman mai daɗaɗa damuwa, yana fara fashe a madaidaicin manne-substrate. Maganin ba shine yin amfani da fim ɗin PTFE mai kauri ba, amma don tabbatar da manne ya kasance sama da Tg. Don matsanancin yanayin cryogenic ƙasa -150 ° C, ko da silicone PSA ya zama gefe. A irin waɗannan lokuta, ana ba da shawarar ɗaukar kayan aikin injiniya (ƙuƙwalwa, sukurori) ko kaset ɗin PTFE marasa mannewa, saboda babu PSA da zai iya aiki ƙasa da -180°C.

Tasiri akan Manne-Ƙarancin Zazzabi da Sassautu

1. Adhesion a yanayin zafi daban-daban

2. Sauƙaƙe-ƙananan zafin jiki

Matsanancin-ƙananan Tg (-120°C) yana ba wa mannewa damar riƙe elasticity da laushi koda a -70°C, yadda ya kamata yana hana ɓarna. Ana iya lanƙwasa tef ɗin, a naɗe, kuma a yi rauni ba tare da karyewa ba - sabanin kaset ɗin mannewa na yau da kullun waɗanda ke fashe a cikin yanayin sanyi.

Takaitawa & Sharuɗɗan Aikace-aikace

Ƙananan zafin canjin gilashin silicone PSA yana ba PTFE babban tef ɗin zafin jiki don kula da ɗanko mai ƙarfi da sassauci a ƙarƙashin ƙananan yanayin zafi.

Jagorar zaɓi ta kewayon zafin jiki:

Adana & Bayanan Amfani:

• Ajiye tef ɗin hermetically a cikin sanyi, busassun wurare bisa ƙayyadaddun fasaha

• Don aikace-aikacen ƙananan zafin jiki (misali, shafa tef a cikin yanayin sanyi), preheat duka tef ɗin da saman haɗin gwiwa don inganta mannewa na farko.

• Ka guji amfani da tef a ƙasa 0 ° C ba tare da dumama ba - ko da silicone PSA yana buƙatar tuntuɓar farko a sama da Tg don dacewa da jikewa.

A taƙaice , ultra-low gilashin canji zafin jiki (-120 ° C) na silicone matsa lamba-m m ne abin da ya sa PTFE high-zazzabi tef musamman dace da sanyi da kuma cryogenic muhallin. Duk da yake kaset na acrylic kasa kasa -30 ° C, siliki na tushen PTFE tef ya kasance mai sassauƙa kuma mai ɗanko har zuwa -70 ° C - kuma yana iya tsira da ƙananan yanayin zafi tare da rage mannewa.

Don yawancin aikace-aikacen sanyi na masana'antu (masu daskarewa, kayan aikin sarkar sanyi, shigarwa na waje a cikin hunturu), daidaitaccen tef ɗin PTFE tare da silicone PSA yana aiki da dogaro. Don aikin cryogenic mai zurfi, tuntuɓi ƙwararru - kuma la'akari da gyaran injin a ƙasa -150 ° C.

Kuna buƙatar tef ɗin PTFE don amfani mai ƙarancin zafin jiki? Aokai PTFE yana ba da daidaitattun maki da gyare-gyare don yanayin sanyi daban-daban. Tuntuɓi ƙungiyar fasaha tare da kewayon zafin ku da zagayowar aiki.

Jiangsu Aokai New Materials Technology Co., Ltd. ne ya bayar.

Don cikakkun sigogi, yanayin aikace-aikacen, da keɓaɓɓen mafita na samfuran samfuran samfuran da suka haɗa da masana'anta mai girman zafin jiki na PTFE, tef ɗin zafin jiki na PTFE, bel ɗin raga na PTFE, bel ɗin fusing mara ƙarfi, zane mai gefe guda PTFE, babban zafin jiki mai juriya mai ɗaukar bel da fiberglass masana'anta , don Allah a tuntuɓe mu:

• Mr. Guo: +86 18944819998

• Malam Liu: +86 13705266308

Muna bin ƙwararru da mutunci, mun himmatu wajen samar da mafita guda ɗaya da ayyuka masu la'akari.