Dɛn ne dodow a ɛne gel fraction index a ɛwɔ silicone pressure-sensitive adhesives ne cohesive ahoɔden a adhesive layer no ntam?

I. Nkyerɛaseɛ ne susudua akwan a wɔfa so de nsɛnkyerɛnneɛ no di dwuma

1. Gel fã ketewaa bi:

   Gel fã no kyerɛ ɔha biara mu nkyekyem a ɛwɔ crosslinked network no mu wɔ silicone pressure-sensitive adhesive a wɔde akata so no mu Teflon teyp a ɛyɛ hyew kɛse a entumi nkɔ nnuru pa (te sɛ toluene) mu. Nea ɛka susuw ho ne sɛ wɔbɛkyekyere ade a wɔde nkata ade a ɛho tew no mu wɔ afiri a wɔde yiyi nneɛma mu, ayi no wɔ Soxhlet afiri a wɔde yiyi mu mu nnɔnhwerew 24, na afei wɔma nkae a entumi nnye no wew ma emu duru yɛ nea ɛkɔ so daa ansa na wɔabu akontaa.

2. Ahoɔden a ɛka bom:

   Wɔ Teflon teapɔn mu no, ahoɔden a ɛka bom yɛ nea ɛda adi wɔ ɔhyew a ɛkorɔn a ɛkura tumi (shear adhesion failure temperature anaa shear holding time). Wɔtaa yɛ sɔhwɛ no wɔ 180 °C wɔ adesoa a emu duru yɛ kilogram 1 ase, na wɔkyerɛw bere no kosi sɛ ade a wɔde nkata so no bɛhwe ase anaasɛ adi nkogu. Saa bo yi da tumi a adhesive layer no tumi gyina nsu a ɛsen ne mpaapaemu ano no adi tẽẽ.

II. Dodow mu Nkitahodi a Ɛda Gel Fraction ne Cohesive Ahoɔden Ntam

1. Wɔ beae a ɛho hia no ase (gel fraction < 60%):

   Nhyehyɛe no nnya nyɛɛ percolating network; adhesive layer no da so ara wɔ viscous-flow tebea mu, a tumi a ɛkura mu no bɛn zero na ahoɔden a mfaso wɔ so a ɛka bom biara nni hɔ.

2. Nneɛma a wɔde di dwuma (60%–85%):

   Wɔ asɛm a ɛho hia no akyi no, nkɔnsɔnkɔnsɔn a ɛyɛ den a etu mpɔn no kɔ soro kɛse bere a gel fã no yɛ kɛse no, na ahoɔden a ɛka bom no nyin kɛse anaasɛ edi tumi a ɛkorɔn mmara akyi. Sɛ wɔma gel fã no kɔ soro fi 60% kosi 70% a, ebetumi ama bere a wɔde kura ɔhyew a ɛkorɔn mu no akɔ soro afi simma akosi nnɔnhwerew; efi 70% kosi 80% no, tumi a wɔde kura mu no betumi akɔ soro mpɛn 3 kosi 10 foforo. Di huammɔdi kwan no dannan nkakrankakra fi huammɔdi a ɛtrɛw a ɛka bom so kɔ huammɔdi a wɔadi afra so.

3. Crosslinking a ɛkorɔn (> 85%):

   Ahoɔden a ɛka bom a ɛkɔ soro no brɛ ase. Sɛ wɔma gel fã no so fi 85% kɔ 95% a, ɛma bere a wɔde kura mu no kɔ soro 20%–50% pɛ, nanso tack (mfiase a ɛbata ho) so tew kɛse esiane molecule nkɔnsɔnkɔnsɔn a wɔabara nti. Sɛ gel fã no boro 95% a, adhesive layer no bɛn elastomer tebea a ɛho tew, na adhesive su a ɛyɛ nhyɛso-te nka no yera titiriw.

III. Semi-Empirical Model ne Nsɛm a Wɔtaa De Di Dwuma

Sɛnea Jiangsu Teflon ntama a ɛyɛ hyew kɛse ayɛfo abɔ no mua no, wobetumi ada abusuabɔ a ɛda shear holding time (t_shear) ne gel fraction (g) ntam wɔ osuahu mu adi sɛ:

lg(t_shear) = A + B · g (a B bɛyɛ 0.1–0.2), a ɛkyerɛ sɛ ɛde ne ho to nkyerɛkyerɛmu so. A ne B botaeɛ gyina MQ resin ratio, adhesive layer thickness, ne test temperature so.

Nsɛm a ɛne no hyia a wɔtaa de di dwuma (180 °C static shear, normalized to a holding time of 1 wɔ 65% gel fraction):

| Gel Nkyekyɛmu | Bere a Wɔde Kura Abusuafo | Di nkoguo Mode |

|---------------|

| 55% na ɛyɛ | < 0.1 na ɛyɛ | 100% nkabom huammɔdi |

| 65% na ɛwɔ hɔ | 1 | ~80% nkabom huammɔdi |

| 75% na ɛwɔ hɔ | 8–15 | Mixed huammɔdi |

| 85% na ɛyɛ | 50–100 na ɛwɔ hɔ | Nneɛma a aka kakra |

| 92% na ɛwɔ hɔ | 150–200 (ɛbɛn saturation) | Pure interfacial huammɔdi |

 

Ɛda adi sɛ wɔ 60%–90% mu no, ɔha biara mu nkyem 5 biara a ɛkɔ soro wɔ gel fã no mu no betumi ama ahoɔden a ɛka bom wɔ ɔhyew a ɛkorɔn mu no akɔ soro mpɛn pii.

IV. Akwan a Wɔfa so Di Dwuma wɔ Teflon Tape a Wɔyɛ Mu

1. Botae gel fã ketewaa bi:

   Wɔ general-purpose ɔhyew-resistant winding tapes fi Jiangsu Teflon high-teature ntama manufacturers, gel fã a wɔkamfo kyerɛ no yɛ 75%–85%, kari pɛ tack ne cohesion. Wɔ ɔhyew a ɛkorɔn anti-stick conveyor belts (a ɛhyɛ bere tenten loading wɔ 200–260 °C), ɛsɛ sɛ gel fã no du 85%–93% na asiw adhesive nkae a ɛnam cohesive mpaapaemu adhesive layer no.

2. Interface matching ahwehwɛde ahorow:

   Teflon teyp a ɛyɛ hyew kɛse no PTFE ani no wɔ soro ahoɔden a ɛba fam koraa; enti, ɛsɛ sɛ ahoɔden a ɛka bom a ɛwɔ adhesive layer no mu no korɔn sen interfacial adhesion ahoɔden; anyɛ saa a, huammɔdi a ɛka bom bɛba wɔ adwennwen ase. Sɛ gel fã no boro 93% a, adhesive layer no bɛyɛ den, na ɛtew wetting ne conformability to the PTFE substrate, a ebetumi ama edge lifting aba. Wɔ nneɛma a wɔyɛ mu no, ɛho hia sɛ wɔhwɛ crosslinking ɔhyew, bere, ne catalyst dodow so pɛpɛɛpɛ na ama wɔato gel fã no mu wɔ botae no mu, na wɔanya nsakrae a wotumi de ho to so fi huammɔdi a ɛka bom so kɔ huammɔdi a ɛwɔ ntam.

Nsɛm a ɛwɔ atifi hɔ no, wɔde mae Jiangsu Okai Nneɛma Foforo Mfiridwuma Co., Ltd.

Sɛ wopɛ sɛ wusua pii fa nsɛm a ɛkɔ akyiri, dwumadie tebea, ne customization options ma yɛn nneɛma nyinaa —a Teflon ntama a ɛyɛ hyew kɛseɛ, Teflon ɔhyew kɛseɛ teyp, Teflon a ɛyɛ hyew kɛseɛ mesh abɔsoɔ, adhesive-free seamless belts ma laminators, PTFE ntama a ɛwɔ afã baako, ɔhyew a ɛkorɔn conveyor ka ho abɔso, ntama a wɔde fiberglass ayɛ a ɛyɛ hyew kɛse, ne nea ɛkeka ho—yɛsrɛ sɛ ntwentwɛn wo nan ase sɛ wobɛfa nea edidi so yi so ne yɛn adi nkitaho:

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