Sɛnea Silicone Adhesive Tg Ka PTFE Tape Adwumayɛ wɔ Ɔhyew a Ɛba Fam

So woabɔ mmɔden pɛn sɛ wode teyp a ɛnyɛ den bedi dwuma wɔ frigye mu? Ɛdan yɛ den, ɛmma ɛnyɛ nnam, na sɛ wɔabɔ no a, ɛpaapae. Ma PTFE teapɔn a ɛyɛ hyew kɛse a wɔde di dwuma wɔ mmeae a ɛhɔ yɛ hyew a ɛba fam – efi awɔw mu nneɛma a wɔde sie so kosi cryogenic pipelines so – adhesive’s glass transition temperature (Tg) no na ɛma nsonsonoe no nyinaa ba.

Silicone nhyɛso-sensitive adhesive wɔ Tg a ɛba fam koraa a ɛbɛyɛ -120°C . Eyi ne ade a ahintaw a enti PTFE teyp kɔ so yɛ nea ɛyɛ mmerɛw na ɛbata ho wɔ ɔhyew a ɛba fam te sɛ -70°C mu.

Aokai PTFE asua saa agyapade yi ho ade kɛse. Saa asɛm yi kyerɛkyerɛ nyansahu a ɛwɔ Tg akyi ne sɛnea ɛka teyp adwumayɛ wɔ awɔw mu.

Dɛn Ne Glass Transition Temperature (Tg) na Dɛn Nti na Ɛho Hia?

Glass transition temperature (Tg) ne beae a polymer sesa fi tebea a ɛyɛ mmerɛw na ɛte sɛ rɔba mu kɔ tebea a ɛyɛ den na ɛyɛ mmerɛw a ɛte sɛ ahwehwɛ mu . Sɛ ɔhyew kɔ fam sen Tg a, polymer molecule nkɔnsɔnkɔnsɔn no yɛ nwini, na ɛhwere nsu ne tumi a wɔde bata ho.

Sɛ wopɛ nneɛma a wɔde nkata nneɛma so a ɛyɛ den a:

• Above Tg: Nkɔnsɔnkɔnsɔn tu fa ahofadi → ade a wɔde nkata so tra hɔ yɛ mmerɛw, ɛyɛ nnam, na ebetumi ayɛ nsu wɔ nneɛma so

• Tg ase: Nkɔnsɔnkɔnsɔn ayɛ nwini → ade a wɔde nkata so no yɛ den, ɛhwere tack, na ɛyɛ mmerɛw

Nea enti a silicone PSA yɛ soronko: Ne Tg a ɛyɛ -120°C no sua koraa sɛ wɔde toto acrylic adhesives (Tg bɛyɛ -20°C kosi -30°C) ho a. Wei kyerɛ sɛ silicone kɔ so yɛ elastic na ɛyɛ nnam wɔ ɔhyew a ɛtrɛw kɛse mu – efi -70°C kosi 260°C.

Abusuabɔ a ɛda Tg ne adhesive adwumayɛ ntam no nyɛ on/off switch a ɛnyɛ den. Sɛ ɛboro Tg so 30°C mpo a, molecule ahorow no da so ara sua; ebia ade a wɔde nkata so no bɛyɛ ‘aboa nhoma’ mmom sen sɛ ɛbɛyɛ rɔba koraa. Sɛ wɔde PTFE teyp di dwuma wɔ ase -50°C a, ɛsɛ sɛ ade a wɔde nkata so no kura ‘rubbery plateau’ modulus a ɛwɔ 104 ne 106 Pa. Silicone PSA tumi yɛ eyi kodu bɛyɛ -80°C esiane ne siloxane akyi dompe a ɛyɛ mmerɛw (–Si–O–Si–) nti. Acrylic adhesives, a carbon-carbon akyi nnompe a ɛyɛ den no, taa hwere tack wɔ -30°C ase. Eyi kyerɛkyerɛ nea enti a wɔkamfo PTFE teyp a egyina silicone so nkutoo kyerɛ sɛ wɔmfa nhyɛ frigye mu (-30°C kosi 0°C) anaa mmeae a cryogenic.

Microscopic Nkɛntɛnso Akwan a Tg nya wɔ PTFE Teyp so

adwumayɛ wɔ ɔhyew a ɛba fam nyinaa mu no, PTFE teyp a ɛyɛ hyew kɛse no wɔde ade a wɔde nkata so ne PTFE substrate no nyinaa bom kyerɛ . PTFE ankasa nso wɔ Tg bɛyɛ -120°C – ɛyɛ nwonwa sɛ ɛte sɛ silicone PSA.

Nhumu titiriw: Bere tenten a ɔsom mu hyew no kɔ so tra Tg so koraa (sɛ nhwɛso no, -70°C, a ɛyɛ 50°C boro -120°C) no, ade a wɔde nkata so ne nea ɛwɔ ase no nyinaa kɔ so tra tebea a ɛyɛ den kɛse mu, na ɛma wonya ahoɔden a ɛkyɛn so wɔ ɔhyew a ɛba fam mu a ɛyɛ mmerɛw na ɛbata ho a ɛyɛ den.

Aokai PTFE’s thermal analysis lab asi so dua sɛ silicone PSA kura bɛboro 80% wɔ ne dan mu hyew mu peel ahoɔden mu wɔ -70°C, bere a acrylic PSA hwere bɛboro 90% wɔ ase -30°C. Saa data yi ne Tg nsonsonoe no hyia.

Wɔ cryogenic a wɔde di dwuma ankasa mu (sɛ nhwɛso no, mask tape a wɔde petepete plasma a ɛyɛ hyew a ɛba fam anaasɛ wɔde si hɔ bere tiaa bi wɔ nsu nitrogen dewars mu), wɔn a wɔde di dwuma no taa di mfomso de asodi to PTFE sini no so sɛ ɛpaapae bere a nea odi fɔ ankasa ne ade a wɔde nkata so no. Sɛ ade a wɔde nkata so no yɛ nwini wɔ ne Tg ase a, ɛhwere nea ɛne no hyia na entumi nnye nhyɛso a ɛwɔ benkum so no. Afei nhyɛso no dan kɔ PTFE substrate no mu, a ebia ɛda so ara yɛ nea ɛyɛ mmerɛw, nanso adhesive no fã a ɛyɛ den no yɛ adwuma sɛ stress concentrator, na efi ase mpaapaemu wɔ adhesive-substrate interface no so. Ano aduru no nyɛ sɛ wode PTFE film a ɛyɛ den bedi dwuma, na mmom sɛ wobɛhwɛ ahu sɛ ade a wɔde nkata so no bɛkɔ so atra ne Tg so. Wɔ cryogenic tebea horow a emu yɛ den a ɛba fam sen -150°C ho no, silicone PSA mpo bɛyɛ kakraa bi. Wɔ tebea horow a ɛtete saa mu no, wɔkamfo kyerɛ sɛ wɔmfa mfiri kyekyere (clamps, screws) anaasɛ PTFE teyp a enni ntama, efisɛ PSA biara ntumi nyɛ adwuma wɔ -180°C ase.

Nkɛntɛnso a Ɛnya wɔ Low-Temperature Adhesion ne Flexibility so

1. Adhesion wɔ Ɔhyew Ahorow mu

2. Ɔhyew a Ɛba Fam a Ɛyɛ Nsakrae

Tg a ɛba fam koraa (-120°C) no ma ade a wɔde nkata so no tumi kura nea ɛyɛ den na ɛyɛ mmerɛw wɔ -70°C mpo mu, na esiw mpaapaemu a ɛyɛ mmerɛw ano yiye. Wobetumi abɔ teyp no, abɔ mu, na wɔabɔ no kwa a ɛnyɛ brittle fracture – ɛnte sɛ adhesive tape a ɛyɛ mpapahwekwa a ɛpaapae wɔ mmeae a awɔw wom.

Nsɛm a Wɔaboaboa Ano & Akwankyerɛ a Wɔde Di Dwuma

Silicone PSA ahwehwɛ nsakrae hyew a ɛba fam no ma PTFE teapɔn a ɛyɛ hyew kɛse tumi kura viscosity a ɛyɛ den na ɛyɛ mmerɛw wɔ ɔhyew a ɛba fam tebea horow mu.

Akwankyerɛ a wɔde paw sɛnea ɔhyew te:

Nneɛma a Wɔkora So & Wɔde Di Dwuma Ho Nsɛm:

• Fa teyp sie hermetically wɔ mmeae a ɛhɔ yɛ nwini na ɛhɔ yɛ kusuu sɛnea mfiridwuma ho nsɛm kyerɛ no

• Sɛ wode di dwuma wɔ ɔhyew a ɛba fam mu (sɛ nhwɛso no, wode teyp bɛhyɛ baabi a ɛhɔ yɛ nwini) a, di kan yɛ teyp no ne bonding surface no nyinaa hyew na ama mfiase no abata ho atu mpɔn

• Kwati sɛ wode tape bɛhyɛ 0°C ase a worennyɛ hyew – silicone PSA mpo hia sɛ wodi kan di nkitaho wɔ Tg so na ama ayɛ nsu a ɛfata

In summary , ultra-low glass transition temperature (-120°C) a silicone pressure-sensitive adhesive ne nea ɛma PTFE high-temperature tape fata soronko ma awɔw ne cryogenic mmeae. Bere a acrylic teapɔn di nkogu wɔ -30°C ase no, PTFE teapɔn a egyina silicone so no kɔ so yɛ nea ɛyɛ mmerɛw na ɛyɛ nnam kodu -70°C – na ebetumi atra ase wɔ ɔhyew a ɛba fam kɛse mu bere a ɛbata ho no so tew.

Wɔ mfiridwuma mu awɔw mu dwumadie dodoɔ no ara (freezers, awɔw nkɔnsɔnkɔnsɔn mfiri, abɔnten installations wɔ awɔberɛ mu), standard PTFE tape a silicone PSA yɛ adwuma ahotosoɔ. Sɛ wopɛ cryogenic adwuma a emu dɔ a, kɔ oduruyɛfo titiriw bi nkyɛn – na susuw mfiri a wɔde besi hɔ wɔ -150°C ase ho.

Wohia PTFE teyp a wode bedi dwuma wɔ ɔhyew a ɛba fam mu? Aokai PTFE de gyinapɛn ne abasobɔde a wɔasesa ma mmeae ahorow a awɔw wom ma. Di yɛn mfiridwuma kuw no ho nkɔmmɔ na fa wo hyew dodow ne wo dwumadi kyinhyia.

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