Sɛnea Wɔsɔ PTFE Emulsion Quality hwɛ: 6 Core Indicators & Methods

PTFE emulsion – a wɔsan frɛ no PTFE dispersion – ne ade a wɔde kata fiberglass ntama so ma ɛyɛ PTFE ntama a ɛyɛ hyew kɛse , teyp, ne abɔso. Sɛ emulsion no su no dum a, ade a etwa to no rennyɛ adwuma yiye a ɛnyɛ nea ɛbata ho, ɛnyɛ nea wɔde kata so, anaasɛ ɛrenni huammɔ ntɛm.

Nanso wobɛyɛ dɛn ahu sɛ PTFE emulsion batch bi ye anaa? Wosɔ hwɛ.

Aokai PTFE de PTFE emulsions adi dwuma na wɔasɔ ahwɛ mfe pii. Saa akwankyerɛ yi fa sɔhwɛ nsɛnkyerɛnneɛ titire nsia no ho – nneɛma a ɛyɛ den, pH, nneɛma nketenkete kɛseɛ, nsunsuansoɔ, ahoɔden a ɛgyina pintinn, ne sɛdeɛ ɛteɛ – a akwan a wɔahyɛ da ayɛ ne gyinapɛn a wɔde gye tom.

Solid Content – ​​Nsɛnkyerɛnne a Ɛyɛ Mfitiaseɛ Sen Biara

Nneɛma a ɛyɛ den ka nneɛma no adwumayɛ ne sikasɛm a wɔde di dwuma tẽẽ (nneɛma a ɛyɛ den a wɔde kata so no hwehwɛ sɛ nneɛma a ɛyɛ den a ɛkorɔn).

Akwan a wɔtaa fa so sɔ hwɛ:

Nneɛma a wɔde gye tom:

• Per standard T/FSI 067-2021: Nneɛma a ɛyɛ den a wɔhwehwɛ ma PTFE concentrate a wɔde ahyɛ mu mpɛn pii no yɛ 60±2% .

• Ankasa on-site control gyinapɛn: 60±0.5% (tiighter abodwokyɛre ma daa coating)

pH Botae – Nsɛnkyerɛnne a ɛkyerɛ sɛnea nneɛma gyina pintinn

pH bo ka sɛnea nneɛma a wɔkora so no gyina pintinn, sɛnea ɛyɛ mmerɛw, ne sɛnea ɛne nneɛma afoforo hyia.

Ɔkwan a wɔfa so sɔ hwɛ: Glass Electrode Ɔkwan (Direct Determination) – susuw denam pH mita a wɔde glass electrode a wɔasusuw denam nsɛntitiriw abien anaa abiɛsa calibration so susuw. Eyi ne ɔkwan a wɔtaa fa so a wɔde di dwuma wɔ gyinapɛn mu.

Nneɛma a wɔde gye tom:

• T/FSI 067-2021 biara: pH a ɛyɛ 9.0 – 11.0

• Nsakrae a ɛba pH mu taa kyerɛ sɛ nhyehyɛe no ntumi nnyina anaasɛ nnuru a ɛyɛ adwuma aba (sɛ nhwɛso no, hydrolysis of surfactant) .

• Bere tenten a wɔde di pH nsakrae akyi no ho hia na ama wɔabu nnuru a emulsion no gyina pintinn no atɛn

Nea enti a pH ho hia: Wɔde fluorinated surfactants na ɛma PTFE emulsions no gyina pintinn, a ɛhwehwɛ sɛ wɔde alkaline tebea horow (pH > 8) di dwuma na ama akɔ so ayɛ adwuma yiye. Sɛ pH kɔ fam sen 8 a, emulsion no betumi ayɛ coagulate.

Aokai PTFE kamfo kyerɛ sɛ wɔnsɔ pH nhwɛ wɔ sanku biara a ɛba no so na ɔsram biara bere a wɔde asie no. Sɛ ɛba mpofirim fi 10.2 kɔ 8.5 wɔ adapɛn abien mu a, ɛkyerɛ sɛ emulsion no ntumi nnyina na ɛsɛ sɛ wɔde di dwuma ntɛm ara anaasɛ wɔpow.

Particle Size & Particle Size Nkyekyɛmu

PTFE mfitiaseɛ nneɛma nketenkete no kɛseɛ ne ne nkyekyɛmu pɛyɛ wɔ nkɛntɛnsoɔ kɛseɛ wɔ sini-yɛ su, nsuo a ɛtumi fa mu, ne afiri a ɛtwa toɔ no adwumayɛ so.

Akwan a wɔfa so sɔ hwɛ:

Nhwehwɛmu ho nsɛnkyerɛnne atitiriw:

• D50 (mfinimfini ntwemu) – nea wɔtaa yɛ ma PTFE emulsion: 0.1-0.3 microns

• Particle size distribution width – teateaa no ye ma coating a ɛkɔ so daa

• D10 ne D90 – kyerɛ sɛnea nkyekyɛmu no trɛw

Akwankyerɛ a wɔde gye tom: Wɔ ade a wɔde kata so dodow no ara mu no, ɛsɛ sɛ D50 yɛ 0.15 ne 0.25 μm ntam a 90% a ɛwɔ ±0.1 μm mu wɔ mfinimfini.

Viscosity – Nnwuma a Wɔde Di Dwuma

Viscosity kyerɛ nsu a ɛsen no suban, ɛka coating ne impregnation akwan tẽẽ.

Akwan a wɔtaa fa so susuw nneɛma:

Nneɛma a wɔde gye tom:

• T/FSI 067-2021 biara: Nsuo a ɛwɔ mu no yɛ 12.0 – 30.0 mPa·s (wɔ 25±1°C) .

• Viscosity a ɛba fam dodo → uneven coating, drips

• Viscosity a ɛkorɔn dodo → entumi nkɔ fiberglass mu yiye, hwehwɛ sɛ wɔde dilution

Hyɛ no nsow a mfaso wɔ so: Sɛ wopɛ sɛ wɔde fiberglass ntama kata dip so a, target viscosity taa yɛ 15-20 mPa·s. Sɛ viscosity drifts a, fa nsu a deionized (na ɛba fam) yɛ nsakrae anaasɛ fa thickener (na ama akɔ soro) ka ho.

Stability Evaluation – Nneɛma a wɔkora so & akwantuo mu ahotosoɔ

Stability nhwehwɛmu hwɛ hu sɛ emulsion no kɔ so yɛ pɛ bere a wɔde sie na wɔde rekɔ no. Wɔde akwan a wɔfa so sɔ sɔhwɛ ntɛmntɛm di dwuma de yɛ tebea horow a ɛtra hɔ kyɛ ho mfonini.

Nhwehwɛmu a ɛfa pass/fail ho:

• Delamination, sedimentation, anaa gel formation a wotumi hu biara nni hɔ

• Viscosity nsakrae < 10% fi mfiase

• Nneɛma nketenkete no kɛse D50 nsakrae < 15% .

Akwankyerɛ a ɛfa nkwa nna ho: Sɛ wɔkora so yiye (10-30°C, wɔatoto mu) a, PTFE emulsion taa kɔ so gyina hɔ pintinn asram 6-12. Sɛ centrifuged test kyerɛ sɛ >5% sediment a, tow batch no gu.

Nhwɛsoɔ a Wɔde Hwɛ – Batch Consistency Check a Ɛyɛ Ntɛmntɛm

Fa w’ani hwɛ nhwɛsode no wɔ abɔde mu hann ase.

Sɛnea wogye tom: Emulsion fitaa anaa kɔkɔɔ a ɛyɛ hare, ɛyɛ pɛ, a biribiara nni hɔ a ɛnteɛ te sɛ delamination, gel a ɛyɛ kurukuruwa, honam ani a ɛba, anaasɛ osutɔ a ɛda adi pefee.

Nea ɛsɛ sɛ wohwɛ:

• Esum → efĩ a ebetumi aba anaasɛ ɔhyew a ɛsɛe

• Wora a ɛwɔ soro → ɛyow anaasɛ ɛyɛ mmerɛw fã bi

• Nkuruwankuruwa anaa grit → coagulated polymer (bɔne) .

• Nsuo a emu da hɔ wɔ soro → sedimentation aba

Nsɛm a Wɔaboaboa Ano – Paw Sɔhwɛ Akwan a Egyina Dwumadi So

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