Ndlela leyi Silicone Adhesive Tg yi khumbaka ha yona matirhelo ya PTFE Tape eka Mahiselo ya le Hansi

Xana u tshame u ringeta ku tirhisa thepi leyi tolovelekeke efrijini? Yi hundzuka yi tiya, yi lahlekeriwa hi ku namarhela naswona yi pandzeka loko yi govekile. Swa Thepi ya mahiselo yale henhla ya PTFE leyi tirhisiwaka eka tindzhawu ta mahiselo yale hansi – kusuka eka vuhlayiselo byo titimela kuya eka tiphayiphi ta cryogenic – adhesive’s glass transition temperature (Tg) yi endla ku hambana hinkwako.

Xinamarheti lexi twaka ntshikelelo wa silicone xina Tg yale hansi swinene ya kwalomu ka -120°C . Lexi i xivangelo lexi fihliweke lexi endlaka leswaku PTFE tape yitshama yirikarhi yi olova naswona yi namarhela eka mahiselo yale hansi kufika eka -70°C.

Aokai PTFE yi dyondze ngopfu ndhawu leyi. Xihloko lexi xi hlamusela sayense leyi nga endzhaku ka Tg na ndlela leyi yi khumbaka matirhelo ya thepi eka swiyimo swo titimela.

Xana I Yini Mahiselo Ya Ku Cinca Ka Nghilazi (Tg) Naswona Ha Yini Ri Ri Na Nkoka?

Mahiselo ya ku cinca ka nghilazi (Tg) i ndzhawu leyi polymer yi cincaka kusuka eka xiyimo xo olova, xa rhaba kuya eka xiyimo xo tiya, xa brittle glassy . Loko mahiselo ya hunguteka ehansi ka Tg, ti polymer molecular chains ta titimela, ti lahlekeriwa hi fluidity xikan’we na vuswikoti byo namarhela.

Eka swinamarheti leswi nga ni ntshikelelo:

• Ehenhla ka Tg: Ti chains ti famba hiku ntshunxeka → adhesive yitshama yi olovile, yi namarhela, naswona yinga tsakamisa tindzhawu

• Ehansi ka Tg: Ti chains ti titimela → adhesive ya tiya, yi lahlekeriwa hi tack, naswona yi hundzuka brittle

Leswaku hikokwalaho ka yini silicone PSA yiri yo hlawuleka: Tg ya yona ya -120°C yile hansi swinene loko ku pimanyisiwa na ti acrylic adhesives (Tg kwalomu ka -20°C kuya eka -30°C). Leswi swivula leswaku silicone yitshama yiri elastic naswona yi namarhela eka mahiselo yo anama swinene – kusuka eka -70°C kuya eka 260°C.

Vuxaka exikarhi ka Tg na matirhelo ya adhesive ahi swiwitsi swo olova swo pfula/tima. Hambi kuri 30°C e henhla ka Tg, ku famba famba ka ti molekyuli swahari kona; xinamarheti xingava na ‘xikhumba’ kutlula kuva xiri na rhaba hiku hetiseka. Eka switirhisiwa swa PTFE tape ehansi ka -50°C, xinamarheti xifanele ku hlayisa modulus ya ‘rubbery plateau’ exikarhi ka 104 na 106 Pa. Silicone PSA yi fikelela leswi kuya ehansi kwalomu ka -80°C hikokwalaho ka nkolo wa yona wo olova wa siloxane (–Si–O–Si–). Ti adhesives ta acrylic, letingana ti carbon-carbon backbones leti tiyeke, hi ntolovelo ti lahlekeriwa hi tack ehansi ka -30°C. Leswi swihlamusela leswaku hikokwalaho ka yini ku hlohleteriwa ntsena ti silicone-based PTFE tapes eka switirhisiwa swa freezer (-30°C kuya eka 0°C) kumbe tindzhawu ta cryogenic.

Endlelo ra Nkucetelo wa Microscopic wa Tg eka Thepi ya PTFE

Matirhelo hinkwawo ya mahiselo yale hansi ya thepi ya mahiselo yale henhla ya PTFE ya vekiwa hiku hlanganela hi havumbirhi bya leyara yo namarhela na substrate ya PTFE . PTFE hi yoxe yitlhela yiva na Tg ya kwalomu ka -120°C – leyi fanaka swinene na silicone PSA.

Vutivi bya nkoka: Loko ntsena mahiselo ya vukorhokeri ya tshama yale henhla swinene ka Tg (xikombiso, -70°C, leyinga 50°C ehenhla ka -120°C), havumbirhi bya xinamarheta na substrate switshama eka xiyimo xale henhla xa elastic, leswi tiyisisaka ku olova ka kahle swinene ka mahiselo yale hansi xikan’we naku namarhela loku tiyeke.

Aokai PTFE’s thermal analysis lab yi tiyisisile leswaku silicone PSA yi hlayisa kutlula 80% wa matimba ya yona ya peel ya mahiselo ya kamara eka -70°C, kasi acrylic PSA yi lahlekeriwa kutlula 90% ehansi ka -30°C. Data leyi yi fambisana na ku hambana ka Tg.

Eka ku tirhisiwa ka xiviri ka cryogenic (xikombiso, mask tape ya ku fafazela ka plasma ya mahiselo yale hansi kumbe ku khomiwa ka xinkarhana eka ti liquid nitrogen dewars), vatirhisi vatala ku sola filimi ya PTFE hiku pandzeka loko mudyohi wa xiviri kuri xinamarheti. Loko adhesive yi freeze ehansi ka Tg ya yona, yi lahlekeriwa hi compliance naswona ayi koti ku tswonga ntshikelelo wa ku gombonyoka. Kutani strain yi hundzisela eka PTFE substrate, leyi yinga ha olovaka, kambe adhesive’s stiff layer yitirha tani hi stress concentrator, yisungula ku pandzeka eka adhesive-substrate interface. Ntlhantlho a hi ku tirhisa filimi ya PTFE yo tiya, kambe ku tiyisisa leswaku xinamarheti xi tshama ehenhla ka Tg ya xona. Eka swiyimo swa cryogenic swotala swinene ehansi ka -150°C, hambi kuri silicone PSA yiva marginal. Eka swiyimo swotani, ku bohiwa hi michini (clamps, screws) kumbe ti adhesive-free PTFE tapes swa hlohleteriwa, tani hileswi kungariki na PSA leyinga tirhaka ehansi ka -180°C.

Vuyelo eka Ku Namarhela ka Mahiselo ya le Hansi na ku Cinca-cinca

1. Ku Namarhela eka Mahiselo yo Hambana

2. Ku Cinca-cinca ka Mahiselo ya le Hansi

Tg yale hansi swinene (-120°C) yi endla leswaku adhesive yi hlayisa elasticity xikan’we naku olova hambi kuri eka -70°C, kahle kahle swisivela brittle cracking. Thepi yinga goveka, yi phutseriwa, naku rhendzeleka hiku ntshunxeka handle ka brittle fracture – kuhambana na ti adhesive tapes leti tolovelekeke leti pandzekaka eka tindzhawu leti titimelaka.

Nkatsakanyo & Swiletelo swa Xitirhisiwa

Mahiselo yale hansi ya ku cinca ka nghilazi ya silicone PSA ya endla leswaku PTFE high-temperature tape yi hlayisa viscosity leyi tiyeke xikan’we naku olova ehansi ka swiyimo swa mahiselo yale hansi.

Nkongomiso wa ku hlawula hi ku ya hi mpimo wa mahiselo:

Switsundzuxo swa Vuhlayiselo & Matirhiselo:

• Hlayisa thepi hi ndlela ya hermetically eka tindzhawu to kufumela, leti omeke kuya hi swipimelo swa xithekiniki

• Eka ku cheriwa ka mahiselo yale hansi (xikombiso, ku chela thepi eka ndzhawu yo titimela), hisa tape na bonding surface ku antswisa ku namarhela kosungula

• Papalata ku chela tape ehansi ka 0°C handle ko kufumeta – hambi kuri silicone PSA yi lava ku khumbana kosungula ehenhla ka Tg kuva yi tsakamisa kahle

In summary , ultra-low glass transition temperature (-120°C) ya silicone pressure-sensitive adhesive hi yona leyi endlaka leswaku PTFE high-temperature tape yifanele hindlela yo hlawuleka eka tindzhawu to titimela na cryogenic. Loko ti acrylic tapes ti tsandzeka ehansi ka -30°C, silicone-based PTFE tape yitshama yirikarhi yi olova naswona yi namarhela kuya fika eka -70°C – naswona yinga hanya eka mahiselo yale hansi swinene hiku hunguteka ka ku namarhela.

Eka switirhisiwa swotala swa industrial cold (ti freezers, switirhisiwa swa cold chain, ku vekiwa ehandle hi xixika), standard PTFE tape leyingana silicone PSA yitirha hiku tshembheka. Eka ntirho wa deep cryogenic, vulavurisana na mutivi – naswona ehleketa hi mechanical fixation ehansi ka -150°C.

Xana u lava thepi ya PTFE ku tirhisiwa hi mahiselo ya le hansi? Aokai PTFE yinyika tigiredi ta ntolovelo na leti cinciweke eka tindzhawu to hambana hambana to titimela. Tihlanganisi na ntlawa wa hina wa xithekiniki hi mahiselo ya wena na xirhendzevutani xa ntirho.

Yi humesiwile hi Jiangsu Aokai Switirhisiwa Leswintshwa Thekinoloji Co., Ltd.

Ku kuma vuxokoxoko bya tipharamitha, swiyimo swa xikombelo, na swintshuxo leswi endleriweke ku tirhisiwa ka switirhisiwa swa nxaxamelo hinkwawo ku katsa na lapi ra mahiselo ya le henhla ya PTFE, thepi ya mahiselo ya le henhla ya PTFE, bandi ra mesh ra PTFE, bandi ro hlanganisa leri nga riki na swirhabyani, lapi ra PTFE ra tlhelo rin’we, bandi ro fambisa leri lwisanaka na mahiselo ya le henhla na lapi ra fiberglass , hi kombela u hi tihlanganisa:

• Nkulukumba Guo: +86 18944819998

• Nkulukumba Liu: +86 13705266308

Hi namarhela vutshila na vutshembeki, hi tinyiketerile ku nyika swintshuxo swa xiyimo xin’we na vukorhokeri byo tekela enhlokweni.