Cov teebmeem ntawm Environmental Humidity ntawm PTFE Emulsion Impregnation

Nyob rau hauv cov txheej txheem ntau lawm ntawm PTFE high-temperature daim ntaub los ntawm Jiangsu Aokai Cov Khoom Tshiab, cov av noo ib puag ncig feem ntau yog tswj nyob rau hauv ib qho tshwj xeeb ntawm 40% -60% RH , ua ke nrog kev tswj kub. Cov evaporation tus nqi yog hloov me ntsis qis dua cov capillary thauj tus nqi ntawm cov dej nyob rau hauv lub emulsion nyob rau hauv lub capillary network, kom ntseeg tau tias tag nrho cov nkag mus thiab theem ntawm cov emulsion thaum ua tiav tsis xws luag-dawb, heev ntom PTFE sintered films.

Lub hauv paus tseem ceeb ntawm cov av noo ntawm PTFE emulsion impregnation yog nyob rau hauv qhov sib npaug ntawm cov dej evaporation thiab emulsion stability. PTFE emulsion feem ntau yog cov kua uas tsis yog-Newtonian muaj li ntawm PTFE resin particles (dispersed theem), surfactants, stabilizers, thiab dej (nruam theem). Raws li ib qho kev ntsuas ib puag ncig, av noo tswj cov volatilization kinetics ntawm cov kuab tshuaj (dej), exerting fundamental teebmeem raws li nram no:

1. Tej yam tseem ceeb ntawm txoj kev Impregnation

Lub impregnation theem yuav tsum tau cov emulsion zoo nkag mus rau hauv lub pores los yog fiber ntau ntawm lub substrate (xws li, iav fiber ntaub, hlau mesh).

Tsis tshua muaj av noo ib puag ncig : Dej evaporates sai heev, ua rau lub emulsion rau 'surface-dry' sai sai ntawm lub substrate. Qhov no ua rau kom pom tseeb viscosity ntawm lub emulsion ntawm lub interface, cuam tshuam capillary nkag mus rau hauv resin hais mus rau hauv lub substrate sib sib zog nqus substrate thiab ua rau 'tsis txaus impregnation' - uas yog, seem cua nyob rau hauv lub substrate. Lub caij no, evaporation sai tshem tawm cov cua kub ntau, uas yuav ua rau lub zos kub poob tam sim ntawd, destabilizing emulsion thermodynamically thiab inducing surfactant nag lossis daus, ua rau 'txiv kab ntxwv tev' los yog tsis sib xws thickness nyob rau hauv lub impregnated txheej.

High humidity ib puag ncig : Dej evaporation yog inhibited, thiab cov emulsion tseem nyob rau hauv ib tug tsawg-viscosity ntub lub xeev ntawm lub substrate rau ib tug ntev heev lub sij hawm. Rau ntsug lossis inclined substrates, sagging yooj yim tshwm sim nyob rau hauv lub ntiajteb txawj nqus; Rau cov hygroscopic substrates, cov av noo siab tuaj yeem cuam tshuam cov pa tawm hauv cov substrate, tsim cov microbubbles uas tsim los rau hauv qhov tsis xws luag thaum lub sij hawm tom qab sintering.

2. Cov txiaj ntsig tseem ceeb ntawm kev ua yeeb yaj kiab zaum kawg

PTFE zaj duab xis tsim feem ntau muaj ob theem: ziab (dej tshem tawm) thiab kub-kub sintering (particle melting). Cov av noo feem ntau cuam tshuam rau cov qauv ntawm lub cev ntsuab thaum ziab, uas yog 'inherited' rau hauv zaj duab xis zaum kawg sintered.

Kev sib tsoo thiab kev ntxhov siab sab hauv : Zaj duab xis tsim ntawm PTFE resin hais nyob ntawm capillary siab thaum lub sij hawm dej evaporation kom compress cov khoom rau hauv ib txheej tuab. Tsis tshua muaj av noo ua rau muaj kev nce siab hauv capillary siab gradient thiab ntau dhau ceev kom qhuav shrinkage, ua kom muaj zog tensile sab hauv kev ntxhov siab hauv lub cev ntsuab. Txij li thaum PTFE tsis muaj peev xwm kho tus kheej ua ntej sintering, xws li kev ntxhov siab ncaj qha ua rau microcracks lossis macroscopic tawg hauv lub cev ntsuab. Cov kab nrib pleb no tsis tuaj yeem raug tshem tawm tom qab sintering, ua rau cov yeeb yaj kiab xau lossis txo cov neeg kho tshuab lub zog.

Surfactant migration thiab residue : Surfactants (xws li lwm txoj hauv kev rau perfluorooctanoic acid) muaj nyob rau hauv kev lag luam PTFE emulsions migrate nrog dej evaporation thaum ziab. Qhov chaw muaj av noo siab ua rau lub qhov rais ziab kom qhuav, tso cai rau lub sijhawm txaus rau cov surfactants kom khaws cia rau ntawm qhov chaw, ua rau 'surface oil slick' lossis tawv tawv. Yog hais tias cov txheej no tsis yog tag nrho decomposed los yog volatilized nyob rau hauv thaum ntxov sintering theem, nws yuav carbonized thiab encapsulated nyob rau hauv cov zaj duab xis, ua yellowing, txo ntom, thiab ho tsis muaj zog adhesion ntawm PTFE thiab lub substrate (tsis zoo interfacial bonding vim muaj kab mob sib cais).

Zaj duab xis ceev thiab porosity : Ib qho zoo tshaj plaws PTFE zaj duab xis yuav tsum tsis muaj pinhole thiab ntom. Kev tswj cov av tsis zoo ua rau cov dej seem seem yog qhov phom sij loj. Nyob rau hauv high humidity, yog hais tias dej tsis yog kiag li tshem tawm thaum lub sij hawm cua sov thiab qhuav theem, residual ya raws vaporizes instantaneously thaum lub sij hawm tom qab sintering (kwv yees li 327-400 ° C) nrog drastic ntim expansion, tsim blowholes los yog interlayer hlwv nyob rau hauv ib feem ntawm melted zaj duab xis. Hloov pauv, nyob rau hauv cov av qis heev, qhov ziab sai sai ua rau daim tawv nqaij uas thaiv cov dej hauv cov evaporation, kuj ua rau hlwv los yog delamination thaum sintering vim muaj vapor siab.

Hauv cov ntsiab lus, kev cuam tshuam ntawm ib puag ncig cov av ntawm PTFE emulsion ua yog qhov tseem ceeb ntawm kev cuam tshuam hauv dej evaporation kinetics:

·  Tsis tshua muaj av noo (hnyav ntau dhau)  yuav ua rau: kev nkag mus tsis zoo, thaiv qib (shrinkage kab noj hniav), ziab tawg, thiab tsis sib xws ntawm cov khoom seem ntawm surfactant.

·  Cov av noo ntau heev (yooj yim heev)  yuav ua rau: sagging, nce pinholes, ntau surfactant floating, blistering tom qab sintering, thiab txo adhesion.

Cov ntaub ntawv saum toj no yog muab los ntawm Jiangsu Aokai New Materials Technology Co., Ltd.

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