Ngaba ukhe wazama ukusebenzisa iteyiphu eqhelekileyo kwisikhenkcisi? Ijika ibe lukhuni, iyeke ukuncamathela, kwaye iyaqhekeka xa igobile. Kuba I-PTFE i-tape yobushushu obuphezulu obusetyenziswa kwiindawo eziphantsi kweqondo lokushisa - ukusuka kwindawo ebandayo ukuya kwimibhobho ye-cryogenic - i-adhesive's glass transition temperature (Tg) yenza wonke umehluko.
I-Silicone i-adhesive-sensitive adhesive ine-Tg ephantsi kakhulu emalunga -120 ° C. Esi sisizathu esifihliweyo sokuba kutheni i-PTFE tape ihlala ibhetyebhetye kwaye incamathele kumaqondo obushushu asezantsi njenge -70°C.
I-Aokai PTFE ifunde le propati ngokubanzi. Eli nqaku lichaza isayensi emva kwe-Tg kunye nendlela echaphazela ngayo ukusebenza kwe-tape kwiimeko ezibandayo.
Yintoni iGlass Transition Temperature (Tg) kwaye kutheni ibalulekile?
Iqondo lobushushu beglasi (Tg) yindawo apho ipholima itshintsha ukusuka kwimo ethambileyo, eyirabha ukuya kwimeko yeglasi eqinileyo . Xa ubushushu behla ngaphantsi kwe-Tg, i-polymer molecular chain chain, ilahlekelwa yi-fluidity kunye nokukwazi ukunamathela.
Kwizinto zokuncamathelisa ezinobuthathaka boxinzelelo:
Ngaphezulu kwe-Tg: Amatyathanga ahamba ngokukhululekileyo → into encamathelayo ihlala ithambile, incangathi, kwaye inokumanzisa umphezulu
Ngezantsi kwe-Tg: Amatyathanga angumkhenkce → into encamathelayo iyaqina, ilahlekwe yintambo, kwaye ibemnkum.
Kutheni i-silicone i-PSA ikhethekileyo: I-Tg yayo ye--120 ° C iphantsi kakhulu xa ithelekiswa ne-adhesives ye-acrylic (Tg ejikeleze -20 ° C ukuya -30 ° C). Oku kuthetha ukuba i-silicone ihlala ilula kwaye incangathi kuluhlu olubanzi lobushushu ukusuka ku -70°C ukuya kuma-260°C.
Ubudlelwane phakathi kwe-Tg kunye nokusebenza okunamathelayo akuyinto elula yokuvula / yokucima. Nangona i-30 ° C ngaphezu kwe-Tg, ukuhamba kwee-molecular kusekho umda; into encamathelayo inokuba 'yisikhumba' kunokuba ibe yirabha epheleleyo. Kusetyenziso lwe tape ye-PTFE engaphantsi kwe -50°C, into encamathelayo kufuneka igcine imodyuli ye-'rubbery plateau' phakathi kwe-10⁴ kunye ne-10⁶ Pa. I-Silicone PSA ifezekisa oku ukuya kutsho malunga no -80°C ngenxa yomqolo wayo we-siloxane oguquguqukayo (–Si–O–Si–). Izinto zokuncamathelisa ezenziwe ngeAkriliki, ezinomqolo oqinileyo wekhabhon-khabhoni, zidla ngokuphulukana ne-tack engaphantsi kwe-30°C. Oku kuchaza ukuba kutheni kuphela iiteyiphu ze-PTFE ezisekelwe kwi-silicone zicetyiswa kwizicelo zesikhenkcisi (-30 ° C ukuya ku-0 ° C) okanye iimeko ze-cryogenic.
Indlela yeMpembelelo yeMicroscopic yeTg kwiTape yePTFE
Ukusebenza okuphantsi kweqondo lokushisa eliphantsi kwe- PTFE i-tape ephezulu yokushisa inqunywe ngokudibeneyo yi- adhesive layer kunye ne- PTFE substrate . I-PTFE ngokwayo nayo ine-Tg emalunga -120 ° C - ifana ngokuphawulekayo ne-silicone ye-PSA.
Uluhlu lobushushu |
I-Adhesive State |
PTFE Substrate State |
Ukuziphatha kweTape ngokubanzi |
Ngaphezulu kweTg (>-120°C, umz., -70°C) |
Irabha, incangathi |
Ubhetyebhetye |
Ukubambelela kakuhle, kunokugoba ngaphandle kokuqhekeka |
Kufuphi Tg (malunga -120°C) |
Indawo yotshintsho |
Indawo yotshintsho |
Incitshisiwe kodwa isasebenza |
Ngezantsi kweTg (<-120°C, umz., -180°C) |
Iglasi, ibhityile |
Iqinile |
Ukuncamathela kulahlekile; itheyiphu iba brittle |
Ingqiqo ephambili: Ngethuba nje iqondo lokushisa lenkonzo lihlala lide ngaphezu kwe-Tg (umzekelo, -70 ° C, eyi-50 ° C ngaphezu kwe-120 ° C), zombini i-adhesive kunye ne-substrate ihlala kwindawo e-elastic, eqinisekisa ukuguquguquka okusemgangathweni ophantsi kunye nokubambelela okuzinzileyo.
Ilebhu yohlalutyo lwe-thermal ye-Aokai PTFE iqinisekisile ukuba i-silicone PSA igcina ngaphezu kwe-80% yamandla ayo obushushu begumbi kwi-70 ° C, ngelixa i-acrylic PSA ilahlekelwa ngaphezu kwe-90% ngaphantsi kwe-30 ° C. Le datha ihambelana nomahluko weTg.
Kusetyenziso lwe-cryogenic oluyinyani (umzekelo, iteyiphu yemaski yokutshiza kweplasma yobushushu obuphantsi okanye ukulungiswa okwethutyana kulwelo lwenitrogen dewars), abasebenzisi bahlala betyhola ngempazamo ifilimu ye-PTFE ngokuqhekeka xa oyena nobangela uncamathelayo. Xa i-adhesive iba ngumkhenkce ngaphantsi kwe-Tg yayo, ilahlekelwa ukuthotyelwa kwaye ayikwazi ukufunxa uxinzelelo lokugoba. Uxinzelelo ke lutshintshela kwi-substrate ye-PTFE, esenokuba iguquguqukayo, kodwa i-adhesive's stiff layer isebenza njenge-concentrator yoxinzelelo, iqalisa iintanda kwi-adhesive-substrate interface. Isisombululo asikokusebenzisa ifilimu ye-PTFE eninzi, kodwa ukuqinisekisa ukuba i-adhesive ihlala ingaphezulu kwe-Tg yayo. Kwiimeko ezigqithisileyo ze-cryogenic ezingaphantsi kwe-150 ° C, nokuba i-silicone ye-PSA iba yincinci. Kwiimeko ezinjalo, i-mechanical fastening (i-clamps, izikrufu) okanye iiteyiphu ze-PTFE ezingenancamathelisi ziyacetyiswa, njengoko kungekho PSA inokusebenza ngaphantsi kwe-180 ° C.
Impembelelo kwi-Low-Temperature Adhesion and Flexibility
1. Ukubambelela kumaqondo obushushu ahlukeneyo
Uluhlu lobushushu |
Inqanaba lokuncamathela |
Ingcaciso |
-70°C ukuya ku-0°C |
Egqwesileyo |
Ngaphezulu kwe-Tg → ikhonkco lemolekyuli esebenzayo, ukumanzisa okulungileyo kunye nokuchithwa kwamandla |
-100°C ukuya -180°C |
Nciphisiwe |
Intshukumo yemolekyuli ithintelwe, kodwa i-silicone isayodlula i-acrylic |
Ngaphantsi kwe-180°C |
Ngokwenyani zero |
Amatyathanga aphantse abe ngumkhenkce; Ukuziphatha kwePSA kuyanyamalala |
2. Ukuguquguquka kobushushu obuphantsi
I-ultra-low Tg (-120 ° C) yenza ukuba i-adhesive igcine i-elasticity kunye ne-softness nakwi-70 ° C, ikhusela ngokufanelekileyo i-brittle cracking. I-tape inokugoba, isongiwe, kwaye ilimala ngokukhululekileyo ngaphandle kokuqhekeka kwe-brittle - ngokungafaniyo neetape eziqhelekileyo zokubambelela eziqhekeza kwiindawo ezibandayo.
IsiShwankathelo kunye neziKhokelo zokuSebenza
Ukushisa kweglasi ephantsi ye-silicone ye-PSA yenza i-PTFE i-tape yobushushu obuphezulu ukugcina i-viscosity ezinzileyo kunye nokuguquguquka phantsi kweemeko zobushushu obuphantsi.
Isikhokelo sokhetho ngokoluhlu lobushushu:
Ubushushu beNkonzo |
Imveliso ecetyiswayo |
Amanqaku |
≥ -70°C |
Iteyiphu yePTFE eqhelekileyo ene-silicone yePSA |
Ilungele ngokupheleleyo usetyenziso olubandayo (izikhenkcezisi, iimozulu ezibandayo) |
-70°C ukuya -180°C |
Itheyiphu ye-PTFE elungiselelwe ubushushu obuphantsi obuphezulu |
Isenokufuna ukwenziwa kwesiqhelo |
≤ -180°C |
Ifilimu ye-PTFE engancamatheliyo ecocekileyo + nokulungiswa koomatshini |
Ukubambelela kwi-PSA kuba kukungathembeki |
Ugcino & Amanqaku osetyenziso:
Gcina iteyiphu kwindawo epholileyo, eyomileyo ngokweenkcukacha zobugcisa
Ukusetyenziswa kobushushu obuphantsi (umzekelo, ukusebenzisa iteyiphu kwindawo ebandayo), shushumbisa zombini iteyiphu kunye nomphezulu wokubopha ukuphucula ukunamathela kokuqala.
Kuphephe ukufaka iteyiphu ngaphantsi kwe-0 ° C ngaphandle kokufudumala - nokuba i-silicone i-PSA idinga uqhagamshelwano lokuqala ngaphezu kwe-Tg yokumanzisa okufanelekileyo
Isishwankathelo , i-ultra-low glass transition yeqondo lokushisa (-120 ° C) ye-silicone ye-adhesive pressure-sensitive adhesive yinto eyenza i-PTFE i-tape yobushushu obuphezulu ifaneleke ngokukodwa kwiindawo ezibandayo kunye ne-cryogenic. Ngelixa iiteyiphu ze-acrylic zisilela ngaphantsi -30 ° C, i-silicone-based PTFE tape ihlala iguquguquka kwaye incamathele ukuya kuthi ga -70 ° C - kwaye inokusinda kumaqondo obushushu asezantsi kakhulu kunye nokuncamathela okuncitshisiweyo.
Kwizicelo ezininzi ezibandayo kwimizi-mveliso (izikhenkcezisi, izixhobo ezibandayo, ufakelo lwangaphandle ebusika), itheyiphu eqhelekileyo ye-PTFE ene-silicone PSA isebenza ngokuthembekileyo. Ngomsebenzi onzulu we-cryogenic, dibana nengcali - kwaye uqwalasele ukulungiswa koomatshini ngaphantsi kwe -150 ° C.
Ngaba ufuna iteyiphu ye-PTFE yokusetyenziswa kobushushu obuphantsi? I-Aokai PTFE inikezela ngamabakala asemgangathweni kunye alungisiweyo kwiindawo ezahlukeneyo ezibandayo. Qhagamshelana neqela lethu lobugcisa kunye noluhlu lwakho lobushushu kunye nomjikelo womsebenzi.
Ikhutshwe nguJiangsu Aokai New Materials Technology Co., Ltd.
Iiparamitha ezineenkcukacha, iimeko zesicelo, kunye nezisombululo ezilungelelanisiweyo zeemveliso ezipheleleyo ezibandakanya i-PTFE yelaphu lobushushu obuphezulu, iteyiphu yobushushu obuphezulu be-PTFE, ibhanti le-mesh ye-PTFE, ibhanti le-fusing elingenamthungo, ilaphu le-PTFE elisecaleni elinye, ibhanti lokuhambisa elinobushushu obuphezulu kunye nelaphu le-fiberglass , nceda uqhagamshelane nathi:
Sibambelela kubuchwephesha kunye nemfezeko, sizibophelele ekuboneleleni ngezisombululo zomxhelo omnye kunye neenkonzo ezinolwazelelelo.
