PTFE Emulsion Impregnation-a Environmental Humidity-in nghawng a neih dan

Jiangsu Aokai New Materials siam PTFE high-temperature cloth siam tak takah chuan environment humidity hi 40%–60% RH inkar bik chhungah control a ni tlangpui a , temperature regulation nen a inzawm a ni. Evaporation rate chu capillary network chhunga emulsion chhunga tui capillary transport rate aiin a hniam deuh turin siamrem a ni a, hei hian emulsion chu full penetration leh leveling a tichiang a, chutih rualin defect-free, highly dense PTFE sintered films a siam thei bawk.

PTFE emulsion impregnation-a environment humidity-in nghawng a neih ber chu tui evaporation rate leh emulsion stability inkara dynamic balance-ah a awm a ni. PTFE emulsion hi a tlangpuiin Newtonian ni lo fluid a ni a, PTFE resin particles (dispersed phase), surfactants, stabilizers, leh tui (continuous phase) atanga siam a ni. Environment parameter angin humidity hian solvent (tui) volatilization kinetics a tidanglam a, a hnuaia mi ang hian fundamental effects a nei a ni:

1. Impregnation Process-a nghawng pawimawh tak tak

Impregnation stage-ah chuan emulsion chu substrate-a pores emaw fiber gap (eg, glass fiber cloth, metal mesh)-ah tha taka lut turin a ngai a ni.

Low humidity environment : Tui hi a vawt rang lutuk a, chu chuan emulsion chu substrate-ah 'surface-dry' rang takin a siam a ni. Hei hian interface-a emulsion viscosity langsar tak chu nasa takin a tipung a, resin particle-te chu substrate thuk takah capillary penetration a tikhawlo a, 'insuficient impregnation' — chu chu substrate chhunga residual air pockets a awm tihna a ni. Chutih laiin, rapid evaporation hian heat tam tak a paih chhuak a, chu chuan local temperature tlahniam nghal a thlen thei a, emulsion chu thermodynamically-in a ti destabilize thei a, surfactant precipitation a thlen thei a, chu chuan 'orange peel' emaw impregnated layer-ah uneven thickness a thlen thei a ni.

High humidity environment : Tui vawt hi a titawp a, emulsion chu substrate-ah hian low-viscosity wet state-ah rei lutuk a awm a ni. Vertical emaw inclined substrate tan chuan gravity hnuaiah hian sagging hi awlsam takin a thleng thin a; highly hygroscopic substrate tan chuan humidity sang chuan substrate chhunga gas discharge a tikhawlo thei a, microbubbles a siam thei a, chu chu a hnua sintering neih laiin pinhole defect-ah a lo chang thei a ni.

2. Final Film-Forming Quality-a nghawng pawimawh tak tak

PTFE film siamnaah hian a tlangpuiin stage hnih a awm a, chungte chu drying (tui paih) leh high-temperature sintering (particle melting) te an ni. Humidity hian a vawt laiin green body structure a nghawng ber a, chu chu 'inherited' a ni a, final sintered film-ah a lut a ni.

Cracking leh internal stress : PTFE resin particles film siam nan hian tui a chhuah laiin capillary pressure a innghat a, chu chuan particle te chu dense packed layer ah a compress a ni. Humidity hniam lutuk hian capillary pressure gradient nasa takin a tisang a, drying shrinkage pawh a ti rang lutuk a, green body chhungah tensile internal stress lian tak a siam a ni. PTFE hian sintering hmaa self-healing ability a neih loh avangin chutiang stress hian direct-in green body-ah microcrack emaw macroscopic cracking emaw a thlen thin. Heng crack te hi sintering hnuah pawh tihbo theih a ni lo va, film leak emaw mechanical strength tihhniam emaw a ni.

Surfactant migration leh residue : Commercial PTFE emulsion-a awm surfactant (perfluorooctanoic acid aiah dang ang chi) chu a vawt laiin tui a vawt rualin an migrate thin. Humidity sang tak awmna chuan drying window chu a tizau a, chu chuan surfactants te chu a chung lamah a awm khawm theih nan hun remchang a pe a, 'surface oil slick' emaw vun khauh tak a siam a ni. He layer hi sintering stage hmasa berah a chhe kim lo emaw, a volatilized lo emaw a nih chuan film chhungah carbonized leh encapsulated a ni ang a, chu chuan yellowing a thlen ang a, density a tlahniam ang a, PTFE leh substrate inkara adhesion pawh nasa takin a chak lo ang (contaminant isolation avanga interfacial bonding tha lo).

Film density leh porosity : PTFE film tha ber chu pinhole nei lo leh dense a ni tur a ni. Humidity control dik lo avanga residual moisture awm hi hlauhawmna lian tak a ni. Humidity sang tak hnuaiah chuan heating leh drying stage-a tui lak chhuah kim loh chuan residual moisture chu a hnu lama sintering (approx. 327–400°C)-ah a vaporize nghal vek a, drastic volume expansion a awm a, partially melted film-ah blowhole emaw interlayer blisters emaw a siam a ni. Chumi kalh zawng chuan, humidity hniam tak hnuaiah chuan surface drying rang tak chuan sealed skin a siam a, chu chuan internal water evaporation a tikhawlo a, chubakah sintering laiin blisters emaw delamination emaw a thlen bawk a, hei hi accumulated vapor pressure vang a ni.

Principle-ah chuan PTFE emulsion processing-a environment humidity-in nghawng a neih dan hi a bul berah chuan water evaporation kinetics-a inrawlhna a ni:

·  Humidity hniam (a vawt lutuk)  hian: penetration tha lo, leveling block (shrinkage cavities), drying cracks, leh surfactant residue insem dan inang lo te a thlen thin.

·  Humidity sang (moisture tam lutuk)  hian: sagging, pinholes tihpun, surfactant floating tam lutuk, sintering hnua blistering, leh adhesion tihtlem te a thlen thin.

A chunga kan tarlan te hi Jiangsu Aokai New Materials Technology Co., Ltd.

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