Saa asɛm yi de mfitiaseɛ kwan a edi mũ a wɔfa so de PTFE emulsion hyɛ fiberglass ntama mu no ba. Anamɔn atitiriw ason: 1 Pretreatment (dewaxing/desizing) wɔ 350-400°C de yi nneɛma a ɛma ntama yɛ kɛse fi hɔ; 2 Emulsion formulation a 40-55% solid content ne surfactants ma nsuo a ɛkɔ anim; 3 Impregnation denam dip-squeeze kwan anaa oduruyɛfo blade coating so; 4 Wɔma ɛyow wɔ 100-150°C ma nsuo no yɛ brɛoo na ɛyɛ PTFE film a ɛyɛ dry; 5 Sintering wɔ 360-390°C (ɛkɔ 400°C) de nwene PTFE asinasin no ma ɛbɛyɛ film a ɛkɔ so; 6 Multi-cycle impregnation-drying-sintering a wɔsan yɛ no mpɛn 2-4 sɛnea ɛbɛyɛ a wobedu botae no mu duru ne resin a ɛwɔ mu (45-65%); 7 Ayaresa akyi a corona ayaresa, anoano trimming, winding ne quality inspection ka ho. Core control points: dewaxing koraa, emulsion wetting a edi mũ, nkakrankakra drying, sintering hyew pɛpɛɛpɛ, ne coating density a ɛkɔ so daa. Nneɛma a wɔyɛ no som laminates a wɔde kɔbere adura ho a ɛyɛ frequency a ɛkorɔn, conveyor belts a ɛyɛ hyew kɛse ne adansi membrane nneɛma.

Saa asɛm yi de organic solvents a PTFE ntama a ɛyɛ hyew kɛse tumi gyina ano no ba. PTFE-coated fiberglass ntama da nnuru soronko a ɛnyɛ adwuma adi, ɛkame ayɛ sɛ ɛko tia organic solvents a wɔtaa de di dwuma nyinaa wɔ adwumayɛ tebea a ɛfata mu a entumi nsɛe, ɛho ahonhon anaa nnuru a ɛyɛ adwuma. Nneɛma a wotumi gyina ano no bi ne: nsa (methanol, ethanol, isopropanol), ketones (acetone, MEK, cyclohexanone), esters (ethyl acetate, butyl acetate), hydrocarbons (petrol, toluene, xylene, hexane), hydrocarbon a halogen wom (dichloromethane, chloroform, carbon tetrachloride), ethers (diethyl ether, THF), organic acid (glacial acetic acid, formic acid), amines ne amides (triethylamine, DMF), phenols, ne afoforo te sɛ carbon disulfide, pyridine, silicone ngo ne breki nsu.

Saa asɛm yi ka onwini dodow a wɔhwehwɛ bere a PTFE ntama a ɛyɛ hyew kɛse sintering no ho asɛm. Sɛ wɔde sintering wɔ 380-400°C wie a, ɛsɛ sɛ ntama no fa ntɛmntɛm fa 310-315°C crystallization-sensitive beae no. Anyɛ yiye koraa no, onwini dodow a wɔkamfo kyerɛ ne 30-50°C/min (ntama a ɛyɛ tratraa betumi anya 100-200°C/min denam mframa a ɛma onwini so). Nnwini a ɛba ntɛmntɛm (dum) ma ahwehwɛ a ɛba fam (45-50%), ɛma nkataho a ɛyɛ mmerɛw, ɛyɛ den a ɛwɔ soro a ɛyɛ torotoro, ɛbata ho denneennen, ɛyɛ adwuma yiye a ɛnyɛ nea ɛbata ho, na ɛko tia delamination ne mpaapaemu. Onwini a ɛyɛ brɛoo (fononoo mu onwini) ma ahwehwɛ a ɛkɔ soro (60-70%), na ɛde nkataso a ɛyɛ den, ɛyɛ mmerɛw a ɛyɛ mmerɛw sɛ ɛbɛtwetwe, ayɛ peeling ne microcracks ba.

Wɔnam PTFE a ɛtwetwe ntama a ɛyɛ hyew kɛse so na ɛyɛ denam PTFE a wɔde kata fiberglass ntama a ahoɔden kɛse wom so, na ɛma ahoɔden a ɛtwetwe, ɔhyew a ɛko tia, nea ɛnkyere so, nnuru a ɛko tia, ne friction a ɛba fam. Nneɛma atitiriw a wɔde di dwuma ne: mfiridwuma mu nneɛma a wɔde fa nneɛma mu (ɔhyew a wɔde kyekyere nneɛma, aduan a wɔde to, ntama a wɔde dry, krataa/film a wɔde twetwe); composite molding release ntama ne ɔhyew press cushion liners; welding ntama a ɛbɔ ho ban ne jackets a wɔde siw ɔhyew ano; anyinam ahoɔden motor ne transformer insulation; bearing ahorow a ɛtwetwe ne nea wɔde gyina nsu afiri mu; nnuru a wɔde yiyi mu ne valve a wɔde siw ano wɔ mmeae a asɛe. Ahoɔden a ɛkorɔn a ɛtwetwe no hwɛ hu sɛ ɛbɛtra hɔ akyɛ wɔ nhyɛso, tetew, flexing mpɛn pii, ne ɔhyew a ɛkorɔn mfiridwuma mu nhyɛso wɔ saa dwumadie ahodoɔ a emu yɛ duru yi mu.

Wɔ sintering mu no, PTFE asinasin a ɛwɔ fiberglass ntama so no nwene boro 327°C, na ɛsɛe mfitiase folded-chain lamellae ne nneɛma nketenkete ahye ma ɛyɛ amorphous melt. Sɛ ɛyɛ nwini a, PTFE san yɛ ahwehwɛ a ɛyɛ spherulites a ɛyɛ radially oriented lamellae, a crystallinity yɛ 50–70%. Onwini dodow na ɛkyerɛ sɛnea ahwehwɛ no yɛ pɛ: onwini a ɛyɛ brɛoo no ma ahwehwɛ a ɛkorɔn, spherulites akɛse, ɛyɛ den kɛse; sɛ wodum ntɛmntɛm a, ɛma spherulites a ɛyɛ fɛ na ɛma wotumi yɛ nsakrae yiye.

Saa mfiridwuma ho nsɛm tiawa a efi Jiangsu Aokai hɔ yi hwehwɛ sɛnea sintering hyew a ɛba fam anaasɛ ɛkɔ soro dodo sɛe PTFE ntama a ɛyɛ hyew kɛse no mu. Sintering a ɛba fam no ma nneɛma nketenkete no nsɛe, na ɛde micro-pores, coating-substrate bonding a ɛyɛ mmerɛw, nneɛma a ɛyɛ mmerɛw, mfiri ahoɔden a enye, ne nufusu a ɛnyɛ nea ɛda adi. Ɔhyew a ɛboro so ma PTFE hyew sɛe, na ɛma pinholes, bubbles, brittleness, kɔla sesa kɔkɔɔ kɔ tuntum, na ɛma wusiw a awuduru wom fi mu ba. Nneɛma abien no nyinaa a ɛtra so sɛe compactness, non-stick adwumayɛ, flexibility, insulation, ne dimensional stability.

PTFE ntama a ɛyɛ hyew kɛse a ɛbɔ ho ban gaskets ka dielectric ahoɔden a ɛkorɔn (egyina hɔ pintinn wɔ nsu a ɛyɛ nwini ase), -70°C kosi 260°C ɔhyew a ɛkɔ soro, amansan nnuru a ɛko tia (gye alkali dade a wɔabɔ), a ɛnyɛ nea ɛbata soro (siw creepage ano), anti-creep (fiberglass reinforcement vs. pure PTFE), ahoɔden a ɛkorɔn a ɛtwetwe, friction a ɛba fam bom (μ=0.05-0.1), ne V-0 ogyaframa dodow. Sɛ wɔde toto mica, rɔba, ne PTFE gaskets a ɛho tew ho a, PTFE ntama ma wotumi yɛ nsakrae a ɛkorɔn, wotumi yɛ ho adwuma, na ɛma ɛyɛ den bere tenten. Ɛyɛ papa ma transformers, motor insulation, nnuru flange sealing, ne semiconductor mfiri.

PTFE ntama a ɛyɛ tratraa bere a wɔreyɛ sintering no hwehwɛ sɛ wɔhyɛ nhyɛso, ɔhyew, ne anohyeto so pɛpɛɛpɛ. Akwan titiriw: stenter afiri (pin mprɛte hwɛ ntrɛwmu so, siw weft shrinkage ano), gradient temperature profile (ɔhyew a ɛyɛ brɛoo → 380-400°C kura → onwini a ɛyɛ brɛoo wɔ 310°C ase ansa na gyae nhyɛso), substrate a wɔadi kan atwitwa (yi nwene nhyɛso ansa na wɔde akata so), ne ade a wɔde kata so no mu duru a ɛyɛ pɛ (ɛsiw nsonsonoe a ɛbɛbɔ ano). Ɛsɛ sɛ wɔhwɛ stenter anohyeto so kosi sɛ ɛbɛyɛ nwini wɔ PTFE crystallization point (bɛyɛ 310°C) ase na amma ɔko no ankɔ.

Coating uniformity bere a PTFE emulsion impregnation fiberglass ntama ne nkwa kwan a product su. Nneɛma a wɔde kata so a ɛnyɛ pɛpɛɛpɛ de ba: nea entumi nkɔ so (ɛbata mmeae a ɛyɛ tratraa), mfiridwuma mu mmerɛwyɛ (adwennwen a ɛwɔ mu, ɛtetew), anyinam ahoɔden a entumi nnyina (breakdown voltage kɔ fam kodu 1/10), nnuru a ɛkɔ mu (pinhole corrosion), dimensional issues (warpage), ne processing sintɔ (belt wandering, thickness variation). Uniform coating hwehwɛ sɛ wɔhwɛ emulsion viscosity, solid content, ntama tension, squeeze gaps, ne multi-zone drying / sintering profiles so pɛpɛɛpɛ.

PTFE ntama a ɛyɛ hyew kɛse no fa nhyehyɛe mu nsakrae anan mu bere a ɔhyew kɔ soro no: ɛba fam 260°C – micro-cracking brɛoo ne residual additive volatilization; wɔ 327°C (melting point) – ahwehwɛ-kɔ-amorphous nsakrae, ade a wɔde kata so no yɛ mmerɛw, delaminates fi fiberglass; 400-500°C – PTFE depolymerizes (yi mframa a awuduru wom fi mu), ade a wɔde kata so no yera; ɛboro 500°C – fiberglass yɛ mmerɛw (840°C softening point) na ɛhwere nhyehyɛe no mudi mu kura. Tra ase 260°C kɔ so, kwati >300°C peaks na ama woayɛ adwuma a ahobammɔ wom.