Ku Dizayina Xivumbeko xa Leyara yo Namarhela ya Tithepi ta Mahiselo ya le Henhla ya PTFE ya Wide-Temperature-Range

Xiphemu xo anama xa mahiselo Thepi ya PTFE yifanele ku boha hiku tshembheka eka -70°C (kumbe ehansi) naswona yi hanya eka ku hlangana loku yaka emahlweni eka 200-260°C – span yo tlula 300°C. Leswi swilava sisiteme ya adhesive leyi tshamaka yi olova handle ka ku tsandzeka ka cohesive kumbe interfacial debonding eka yin’wana na yin’wana yo tlula mpimo.

Leyara ya xinamarheta hi ntolovelo i xinamarheti xo hlawuleka xa silicone pressure-sensitive (PSA) lexi pfanganisiweke eka tifilimi ta PTFE leti cinciweke ehenhla kumbe lapi ra fiberglass leri cheriweke PTFE. Xilotlelo xa matirhelo yo tiya eka fasitere ro anama ra mahiselo swile ka ku aka network yo cinca cinca – dizayini leyi ringaniselaka ku tsakama ka mahiselo yale hansi, ku lwisana na creep ya mahiselo yale henhla, na ku tiyisela ka thermal shock.

Aokai PTFE yi tumbuluxile tithepi ta PTFE ta mahiselo yo anama hi ku tirhisa milawu leyi hlamuseriweke laha hansi. Xihloko lexi xi hlamusela swiaki swa mune swa nkoka swa dizayini: xivumbeko xa leyara ya ku cinca, xivumbeko xa microstructure xa biphasic ya xihlala xa lwandle, gradient crosslinking, na ti heat-stabilized composite fillers.

Xivumbeko xa Leyara ya ku Cinca Exikarhi ka Substrate na Leyara yo Namarhela

1. Ntlhontlho wa nkoka – eneji ya le henhla ya PTFE

PTFE yina matimba yale hansi swinene yale henhla (18-20 dynes/cm). Direct coating ya adhesive yitala ku rhurhumela hinkarhi wa thermal cycling hikokwalaho ka mismatched thermal expansion coefficients – PTFE yi andlala 30-40x kutlula fiberglass.

2. Ku tirhisiwa ka le henhla na ku khomiwa ka primer anchoring

Ku tlhantlha leswi, vuandlalo bya PTFE byi endla ti chemical etching hi ti sodium-naphthalene complexes kumbe vutshunguri bya plasma ku nghenisa C=C double bonds na mintlawa ya polar leyi nga na oxygen. Endzhaku ka sweswo, ultra-thin dedicated silicone primer (xikombiso, vinyl-containing silane coupling agent) yi cheriwa ku endla 'molecular bridge' eka interface hiku tirhisa chemical bonding.

3. Xirhendzevutani xa le xikarhi lexi sivelaka ntshikilelo

Eka ti formulations tokarhi, low-modulus, high-ductility elastic intermediate layer (gel-like silicone leyingana swiphemu leswi olovaka) yi nghenisiwa exikarhi ka activated layer na main adhesive layer. Leswi swi tswonga ntshikelelo wa interfacial lowu vangiwaka hi ku cinca-cinca lokukulu ka mahiselo naswona swi sivela ku tlakuka ka makumu ya xinamarheti.

Nawumbisi wa Swivumbeko leswitsongo swa Biphasic ya Swihlala swa Lwandle

Matrix leyikulu ya adhesive i classic PSA system leyi vumbiwaka hi MQ silicone resin (dispersed island phase) na high-molecular-weight polysiloxane (continuous sea phase).

1. MQ silicone resin – xiphemu xa xihlala xo tiya

Yinyika ku hlangana, matimba yo khoma, na ku lwisana na creep ya mahiselo yale henhla. Ku lawula loku kongomeke ka M/Q molar ratio ya yona (hi ntolovelo 0.6-0.9) xikan’we naku hangalaka ka vukulu bya ti particle switiyisisa ku nghenisiwa loku fanaka endzeni ka xiphemu lexi yaka emahlweni kuva ku endliwa tindzhawu ta physical crosslinking.

2. Xiphemu xa polysiloxane lexi yaka emahlweni – xiphemu xa lwandle ro olova

Yi tisa tack ya xihatla, ku tsakama ka mahiselo yale hansi, na ku olova. Hi ntolovelo ku hlawuriwa rhaba ya methyl vinyl silicone leyi nga ni ntiko wa le henhla wa timolekhuli kumbe rhaba ya methyl phenyl vinyl silicone.

3. Ku antswisiwa ko hlawuleka ka mahiselo yo anama

Nhlayo yitsongo ya swiphemu swa siloxane leswingana phenyl yale henhla swa nghenisiwa. Mintlawa ya phenyl yi tshikelela crystallization ya mahiselo yale hansi ya polydimethylsiloxane, leswi hungutaka mahiselo ya brittleness ya adhesive ehansi ka -100°C. Hi nkarhi walowo, mintlawa ya phenyl yi ndlandlamuxa ku tiya ka thermal-oxidative degradation eka mahiselo yale henhla, leswi endlaka leswaku xiphemu xa lwandle lexi yaka emahlweni xi hlayisa elasticity yale henhla eka fasitere ro anama ra mahiselo.

Dizayini ya Crosslinking ya Multi-Layer kumbe Gradient ya ku lwisana na ku hisa

Endlelo ra double-layer coating ri amukeriwile kuva ku ringanisela ku tiya ka creep ka mahiselo yale henhla xikan’we na tackiness ya mahiselo yale hansi:

1. Leyara ya le ndzeni (tlhelo ra substrate) .

Relatively high crosslink density , ku tisa matimba yo khoma ya mahiselo yale henhla yo tiya na matimba yo hlangana tani hi rimba leri nga tsekatsekiki.

2. Leyara ya le handle (vuandlalo byo boha) .

Ultra-low crosslink density na ti molecular chains leti fambafambaka swinene, kutiyisisa ku tsakama hiku hatlisa eka ti adherends eka mahiselo yale hansi xikan’we na tack yosungula leyi ringaneleke.

Hindlela yin’wana, gradient leyi yaka emahlweni ya crosslink density kusuka eka tlhelo rale ndzeni kuya e handle yivumbiwa endzeni ka leyara yin’we hiku tirhisa maendlelo yo horisa, hiku hlanganisa hindlela yoka yingari na swiphiqo ti rigid na flexible functional zones.

Aokai PTFE yitirhisa thekinoloji ya gradient crosslinking kutiyisisa leswaku thepi yitshama yirikarhi yi olova eka -70°C (leswi endlaka leswaku kuva na tack yosungula na conformability) loko yi hlayisa matimba ya cohesive eka 260°C (ku sivela creep na adhesive transfer).

Swilo leswi Hlanganisiweke leswi Tiyisisiweke hi ku Hisa

Nano-scale fumed silica yi hangalasiwa kahle eka matrix yo namarhela kuva yi tiyisisiwa, yihlanganisiwa na swiyenge swimbirhi swa ti fillers leti tirhaka:

1. Swiengeteri leswi nga hisiki

Cerium oxide, iron oxide, na swin’wana swa radical scavengers swi sivela oxidative hardening ya siloxane side chains xikan’we naku onhaka ka backbone ehansi ka kuhisa lokukulu. Ti antioxidants leti ti engetela vutomi bya ntirho eka 260°C.

2. Switirhisiwa swo tata leswi fambisaka ku hisa

Micron-sized aluminium nitride, alumina , na swin’wana, swi hangalasa ku hisa hi ku hatlisa leswaku swi hunguta ku hlengeletiwa ka ku hisa endzeni ni ku hunguta ku dyuhala. Leswi swina nkoka swinene eka switirhisiwa laha tape yitirhisiwaka tani hi thermal interface kumbe laha ku akiwa ka kuhisa kusuka eka substrate swinga hatlisisaka ku onhaka ka adhesive.

Ti fillers hinkwato ti lava surface passivation kumbe silane treatment kuva ku papalata ku tlakuka ka modulus ngopfu xikan’we naku nonoka ka adhesive eka mahiselo yale hansi.

Nkatsakanyo – Netiweke yo pfumelelana na swiyimo swa swiyimo swo tlula mpimo

Leyara yo namarhela ya tithepi ta PTFE ta mahiselo yo anama kahlekahle i platinum-catalyzed addition crosslinking microphase-separated network leyi nghenisiweke na tindhawu to khoma tikhemikhali ta MQ resin na ti hybrid phenyl long-chain siloxanes. Hi ku tirhisa thekinoloji ya gradient crosslinking na co-crosslinking, yi hlanganisa hi ku hetiseka:

• Ku tsakama hiku hatlisa xikan’we naku olova swinene eka mahiselo yale hansi

• Ku hlangana loku tiyeke na matirhelo ya anti-oxidation eka mahiselo yale henhla

...endzeni ka leyara yin’we ya elastic adhesive, ku fikelela swilaveko swo tika swa ku tirhisiwa ka mahiselo yo anama.

Aokai PTFE yi endla tithepi ta PTFE ta mahiselo yo anama hi ku tirhisa dizayini leyi ya sisiteme yo namarhela. Swihlawulekisi swa ntolovelo – ku katsa na ku tiya, crosslink gradient, na ku layicha ka filler – swa kumeka eka swilaveko swo karhi swa xikombelo.

Xihloko lexi xa xithekiniki xi nyikiwile hi Jiangsu Aokai Thekinoloji ya Switirhisiwa Leswintshwa Co., Ltd.

Loko u lava ku dyondza swihlawulekisi leswi nga na vuxokoxoko, swiyimo swa xikombelo na swintshuxo leswi endleriweke layini ya hina ya swikumiwa leswi heleleke, ku katsa na malapi ya mahiselo ya le henhla ya PTFE, tithepi to namarhela ta PTFE, mabandhi yo fambisa ya mesh ya PTFE, mabandhi ya muchini wo fuwa lama nga na swirhabyani, lapi leri funengetiweke hi tlhelo rin’we ra PTFE, mabandhi yo fambisa lama nga ni mahiselo ya le henhla na malapi ya fiberglass ya mahiselo ya le henhla, hi kombela u hi tihlanganisa hi ku tirhisa tichannel leti nga laha hansi:

• Nkulukumba Guo: +86 18944819998

• Nkulukumba Liu: +86 13705266308

Hi namarhela filosofi ya vutirheli ya vutshila na vutshembeki, hi tinyiketerile ku ku nyika swintshuxo leswi heleleke swa xiyimo xin’we na nseketelo lowu anakanyiweke!