Yuav ua li cas Silicone Adhesive Tg cuam tshuam rau PTFE Daim kab xev Performance at Low Temperatures

Koj puas tau sim siv daim kab xev zoo tib yam hauv lub freezer? Nws tig tawv, plam nplaum, thiab tawg thaum khoov. Rau PTFE high-temperature daim kab xev siv nyob rau hauv qis-kub ib puag ncig - los ntawm txias cia rau cryogenic pipelines - cov nplaum lub iav hloov kub (Tg) ua rau tag nrho cov sib txawv.

Silicone siab-rhiab nplaum nplaum muaj qhov tsis tshua muaj Tg ntawm kwv yees li -120 ° C. Qhov no yog vim li cas vim li cas PTFE daim kab xev tseem hloov tau thiab nplaum ntawm qhov kub thiab txias li -70 ° C.

Aokai PTFE tau kawm txog cov cuab yeej no ntau heev. Kab lus no piav qhia txog kev tshawb fawb tom qab Tg thiab nws cuam tshuam li cas rau daim kab xev hauv cov mob khaub thuas.

Iav Transition Temperature (Tg) yog dab tsi thiab Vim Li Cas Nws Tseem Ceeb?

Lub iav hloov pauv kub (Tg) yog qhov taw qhia ntawm lub polymer hloov ntawm lub mos, rubbery xeev mus rau ib qho nyuaj, brittle glassy xeev . Thaum kub poob qis dua Tg, polymer molecular chains khov, poob fluidity thiab muaj peev xwm nplaum.

Rau siab-sensitive adhesives:

• Saum toj no Tg: Chains txav dawb → nplaum nyob twj ywm mos, nplaum, thiab tuaj yeem ntub qhov chaw

• Hauv qab Tg: chains khov → nplaum hardens, poob tack, thiab ua nkig

Vim li cas silicone PSA tshwj xeeb: Nws Tg ntawm -120 ° C yog qhov qis heev piv rau acrylic nplaum (Tg ib ncig -20 ° C txog -30 ° C). Qhov no txhais tau tias silicone tseem elastic thiab nplaum nyob rau hauv ntau qhov kub thiab txias - los ntawm -70 ° C mus txog 260 ° C.

Kev sib raug zoo ntawm Tg thiab kev ua haujlwm nplaum tsis yog qhov yooj yim rau / tawm. Txawm tias 30 ° C saum toj no Tg, kev txav ntawm molecular tseem txwv; cov nplaum yuav yog 'leathery' es tsis yog rubbery. Rau PTFE daim kab xev hauv qab -50 ° C, cov nplaum yuav tsum muaj 'rubbery plateau' modulus ntawm 10⁴ thiab 10⁶ Pa. Acrylic adhesives, nrog cov tawv nqaij-carbon txha nraub qaum, feem ntau poob tack hauv qab -30 ° C. Qhov no piav qhia yog vim li cas tsuas yog silicone-raws li PTFE tapes raug pom zoo rau daim ntawv thov lub freezer (-30 ° C rau 0 ° C) los yog cryogenic ib puag ncig.

Microscopic Influence Mechanism ntawm Tg ntawm PTFE Daim kab xev

Zuag qhia tag nrho qhov kub-kub kev ua tau zoo ntawm PTFE high-temperature daim kab xev yog sib koom txiav txim los ntawm ob lub nplaum txheej thiab PTFE substrate . PTFE nws tus kheej kuj muaj Tg ntawm kwv yees li -120 ° C - zoo kawg nkaus zoo li silicone PSA.

Kev pom tseem ceeb: Ntev npaum li qhov kev pabcuam kub nyob deb tshaj Tg (piv txwv li, -70 ° C, uas yog 50 ° C saum toj no -120 ° C), ob qho tib si nplaum thiab cov substrate tseem nyob rau hauv lub xeev elastic heev, lav zoo heev qis-kub yooj thiab ruaj khov adhesion.

Aokai PTFE lub chaw soj ntsuam thermal tau lees paub tias silicone PSA tswj ntau dua 80% ntawm nws chav kub kub tev lub zog ntawm -70 ° C, thaum acrylic PSA poob ntau dua 90% hauv qab -30 ° C. Cov ntaub ntawv no sib haum nrog Tg qhov sib txawv.

Hauv kev siv cryogenic tiag tiag (piv txwv li, daim npog ntsej muag rau cov ntshav plasma qis qis lossis kho ib ntus hauv cov kua nitrogen dewars), cov neeg siv feem ntau yuam kev PTFE zaj duab xis rau tawg thaum tus neeg ua txhaum tiag yog cov nplaum. Thaum cov nplaum khov rau hauv qab nws Tg, nws poob kev ua raws thiab tsis tuaj yeem nqus cov kev ntxhov siab. Cov kab mob ces hloov mus rau PTFE substrate, uas tej zaum tseem yuav hloov tau, tab sis cov nplaum txheej tawv ua raws li kev ntxhov siab concentrator, pib tawg ntawm cov nplaum-substrate interface. Qhov kev daws teeb meem tsis yog siv cov yeeb yaj kiab PTFE tuab, tab sis kom ntseeg tau tias cov nplaum tseem nyob saum nws Tg. Rau huab cua txias txias hauv qab -150 ° C, txawm tias silicone PSA dhau los ua marginal. Nyob rau hauv tas li ntawd, cov neeg kho tshuab fastening (clamps, screws) los yog adhesive-dawb PTFE tapes raug pom zoo, vim tsis muaj PSA yuav ua hauj lwm hauv qab no -180 ° C.

Kev cuam tshuam rau qis-kub Adhesion thiab Flexibility

1. Adhesion ntawm qhov kub thiab txias

2. Tsawg-kub Flexibility

Lub ultra-low Tg (-120 ° C) ua rau cov nplaum khaws cov elasticity thiab softness txawm nyob rau ntawm -70 ° C, zoo tiv thaiv brittle cracking. Daim kab xev tuaj yeem khoov, qhwv, thiab mob dawb yam tsis muaj pob txha tawg - tsis zoo li cov ntaub nplaum zoo tib yam uas tawg hauv qhov chaw txias.

Summary & Application Guidelines

Cov iav tsis tshua muaj kev hloov pauv kub ntawm silicone PSA ua rau PTFE kub-kub daim kab xev kom ruaj khov viscosity thiab yoog raws nyob rau hauv qhov kub thiab txias.

Daim ntawv qhia kev xaiv los ntawm qhov kub thiab txias:

Cia & Siv Lus Cim:

• Khaws daim kab xev hermetically nyob rau hauv txias, qhuav qhov chaw raws li kev specifications

• Rau daim ntawv thov kub qis (piv txwv li, thov daim kab xev hauv qhov chaw txias), preheat ob daim kab xev thiab qhov chaw sib txuas los txhim kho thawj qhov adhesion

• Tsis txhob siv daim kab xev hauv qab 0 ° C yam tsis tau ua kom sov - txawm tias silicone PSA xav tau kev sib cuag thawj zaug saum Tg rau kev ntub dej kom zoo

Nyob rau hauv cov ntsiab lus , lub ultra-low iav hloov kub (-120 ° C) ntawm silicone siab-rhiab nplaum nplaum yog dab tsi ua rau PTFE high-temperature daim kab xev tshwj xeeb haum rau txias thiab cryogenic ib puag ncig. Thaum acrylic tapes poob qis dua -30 ° C, silicone-raws li PTFE daim kab xev tseem yoog raws thiab nplaum mus rau -70 ° C - thiab tuaj yeem muaj sia nyob qhov kub thiab txias nrog txo adhesion.

Rau feem ntau cov kev siv txias txias (lub freezers, cov khoom siv txias txias, kev teeb tsa sab nraum zoov thaum lub caij ntuj no), tus qauv PTFE daim kab xev nrog silicone PSA ua haujlwm tau zoo. Rau kev ua haujlwm sib sib zog nqus cryogenic, sab laj nrog tus kws kho mob tshwj xeeb - thiab xav txog kev kho tshuab hauv qab -150 ° C.

Xav tau ib daim kab xev PTFE rau kev siv kub tsawg? Aokai PTFE muaj cov qauv thiab hloov kho qib rau ntau qhov chaw txias. Hu rau peb pab neeg ua haujlwm nrog koj qhov kub thiab txias thiab lub voj voog ua haujlwm.

Tshaj tawm los ntawm Jiangsu Aokai Tshiab Materials Technology Co., Ltd.

Rau cov ncauj lus kom ntxaws, daim ntawv thov scenarios, thiab customized kev daws teeb meem ntawm tag nrho-series khoom xws li PTFE kub ntaub, PTFE kub daim kab xev, PTFE mesh siv, seamless fusing siv, ib sab PTFE ntaub, kub resistant conveyor siv thiab fiberglass ntaub , thov hu rau peb:

• Mr. Guo: +86 18944819998

• Mr. Liu: +86 13705266308

Peb ua raws li kev tshaj lij thiab kev ncaj ncees, cog lus los muab cov kev daws teeb meem ib leeg thiab cov kev pabcuam siab.