Yuav ua li cas hnyav Volatilization Rate cuam tshuam PTFE daim kab xev txheej zoo

Hauv kev tsim khoom ntawm PTFE high-temperature daim kab xev , silicone siab-rhiab nplaum nplaum yog siv los ua cov kuab tshuaj raws li cov kuab tshuaj. Raws li daim kab xev coated txav los ntawm qhov cub kom qhuav, hnyav evaporates, tawm hauv qab ib txheej nplaum nplaum. Tus nqi ntawm qhov no tshwm sim - hnyav volatilization tus nqi - yog cov txheej txheem tseem ceeb uas txiav txim siab seb qhov kawg ntawm cov nplaum nplaum yog du, tsis muaj teeb meem, thiab tsis tu ncua tuab, lossis npog hauv pinholes, craters, thiab streaks.

Aokai PTFE tau txhim kho cov txheej txheem txheej txheej thoob plaws ntau txhiab tus khiav haujlwm. Phau ntawv qhia no piav qhia txog yuav ua li cas volatilization tus nqi cuam tshuam rau theem, tsim pinhole, thiab crater defects - thiab yuav ua li cas tswj nws kom zoo PTFE daim kab xev.

Yuav Ua Li Cas Volatilization Rate cuam tshuam rau qib - Lub Viscosity Trade-Off

Leveling yog lub peev xwm ntawm cov ntaub nplaum ntub dej kom tshem tawm cov txheej txheej streaks, transverse kab txaij, thiab txiv kab ntxwv-tev kev ntxhib los mos, tsim kom zoo nkauj. Lub zog tsav yog nto nro; qhov tsis kam yog viscosity.

1. Ceev dhau - qhov tawv nqaij ntawm daim tawv nqaij nres leveling

Thaum cov kuab tshuaj evaporates sai heev, cov kuab tshuaj concentration ntawm qhov chaw ntog sai heev. Silicone PSA (high-molecular-weight polysiloxane solution) yog cov concentration-rhiab heev. Cov txheej txheej saum npoo viscosity nce exponentially - txawm tsim lub siab viscosity 'tawv' yuav luag tam sim ntawd.

Cov tawv nqaij no xauv cov nplaum uas tsis tau kho nyob rau hauv qhov chaw. Cov nplaum tsis tuaj yeem ntws mus rau theem tawm streaks lossis cov cim hniav. Irregular textures generated thaum lub sij hawm txheej yog tas mus li.

2. qeeb dhau - sagging thiab dewetting

Yog hais tias cov kuab tshuaj volatilizes qeeb heev, cov nplaum txheej tseem yog cov kua viscosity tsawg dhau. Thaum qhov no tso cai rau lub sijhawm rau qib, lub ntiajteb txawj nqus ua rau:

• Sagging (adhesive khiav downwards ntawm ntsug nto)

• Cov npoo tuab (cov nplaum nplaum ntawm cov npoo ntawm thaj chaw coated)

• Dewetting - nyob rau ntawm qhov chaw qis-zog PTFE substrates (qhov tseem ceeb ntawm qhov nro tsuas yog 18-20 mN / m), kev ntub dej ntev ntev tuaj yeem ua rau cov nplaum kom ntsws thiab rub tawm ntawm lub substrate, ua kom lub ntsej muag du.

Yuav ua li cas Volatilization Rate Ua Pinholes

Pinholes yog qhov me me los ntawm cov nplaum txheej. Lawv tsim thaum cov kuab tshuaj los yog cua npuas ua rau daig thiab tawg los ntawm qhov chaw rigidified ua ntej cov nplaum tuaj yeem rov ua dua.

1. Mechanism 1 – boiling solvent trapped under the skin

Thaum cov kab xev coated nkag mus rau hauv qhov cub kom qhuav, qhov kub thiab txias ua ke nrog ultra-ceev hnyav volatilization kho cov zaj duab xis nto ua ntej. Cov kuab tshuaj nyob rau hauv txheej vaporizes hnyav, ua npuas. Thaum cov npuas sab hauv ua rau cov tawv nqaij tawv tawv, cov yeeb yaj kiab ua kua tsis tuaj yeem rov qab thiab kho tau - tawm mus tas li pinholes lossis volcano-zoo li craters.

2. Mechanism 2 - npuas tsis tuaj yeem khiav

Cov npuas me me yog ib txwm entrained thaum txheej txheej thiab nplaum pub. Lawv xav tau sijhawm txaus los ntab, tawg, thiab kho thaum muaj viscosity tsawg. Yog tias cov tawv nqaij tawv dhau sai vim yog ziab sai, npuas tsis tuaj yeem khiav thiab kho raws li pinholes.

3. Mechanism 3 - tsis zoo wetting ntawm micro-pits

Thaum ntxov volatilization spikes nplaum viscosity sharply, depriving cov kev daws teeb meem ntawm lub peev xwm maj mam sau micro-pits thiab tshem tawm interfacial cua. Qhov no ua rau muaj qhov ntom ntom zoo li cov dej ntub dej tom qab ziab.

Yuav Ua Li Cas Volatilization Rate Ua Craters (Dimples)

Craters yog me me, puag ncig kev nyuaj siab ntawm cov nplaum nplaum, txawv ntawm pinholes. Lawv yog tshwm sim los ntawm lub zos nto nro imbalances.

1. Mechanism 1 – condensed water droplets

Ceev ceev volatilization absorbs loj vaporization tshav kub, sharply txias lub ntub zaj duab xis thiab substrate nto. Yog hais tias qhov kub thiab txias poob qis dua qhov ambient dew point, dej vapor hauv huab cua condenses mus rau hauv micro-droplets ntawm zaj duab xis ntub dej.

• Qhov saum npoo ntawm dej: ~ 72 mN / m

• Nto nro ntawm silicone nplaum: 20-25 mN / m

Qhov sib txawv loj no tsim kom muaj qhov sib txawv ntawm qhov chaw hauv cheeb tsam uas ua rau cov nplaum nyob ib puag ncig kom thim tawm ntawm cov tee dej, tawm hauv cov craters tom qab ziab.

2. Mechanism 2 – cov kab mob sib kis

Cov kab mob uas tsis tshua muaj-nruj (silicone micro-droplets, roj) inevitably muaj nyob rau hauv cov nplaum lossis qhov chaw ua haujlwm. Cov impurities no tsim cov chaw qis-nto-nrawm ntawm cov yeeb yaj kiab ntub dej. Raws li cov nyhuv Marangoni, cov nplaum ntws tawm sab nraud los ntawm cov chaw zov me nyuam, tsim kev nyuaj siab.

• Nruab nrab volatilization tso cai rau kev nyuaj siab los kho tus kheej ntawm cov nplaum rov qab.

• Kev nrawm nrawm dhau los ua rau cov kua dej ntws tawm ua ntej kho - craters raug kaw mus tas li.

3. Mechanism 3 - dewetting craters los ntawm cov dej tsis txaus

PTFE substrates muaj qhov tseem ceeb ntawm qhov nro ntawm tsuas yog 18-20 mN / m - txoj cai ntawm qhov pib ntawm kev ntub dej. Cov nplaum nplaum silicone xav tau lub qhov rais qis-viscosity txaus kom kis tau thiab ntub dej ntawm qhov chaw thermodynamically. Yog hais tias cov kuab tshuaj volatilizes sai heev, cov nplaum poob fluidity ua ntej wetting tiav. Thaum lub sij hawm ziab, ntim shrinkage thiab nto nro quab yuam lub nplaum rau daim ntawv cog lus, tawm hauv micro-craters ntawm tsis zoo wetted aav - pom raws li ib tug pockmarked nto.

Kev daws - Yuav Ua Li Cas Tswj Volatilization rau Cov Txheej Txheem Tsis Zoo

Qhov zoo tshaj plaws solvent volatilization lub tswv yim siv gradient tshuav nyiaj li cas :

1. Ob-theem ziab kom qhuav

2. Sib xyaw cov kuab tshuaj

Siv ib qho kev sib xyaw ntawm cov kuab tshuaj nrog cov ntsiab lus kub sib txawv:

• High-boiling, qeeb-evaporating zoo cov kuab tshuaj (toluene, xylene, los yog ntau dua-boiling aromatics / esters) - lub ntsiab tivthaiv - xyuas kom meej solubility thiab txaus leveling lub sij hawm.

• Qhov me me ntawm nruab nrab / qis-rhaub nrawm-siv cov kuab tshuaj - sib xyaw kom kho qhov ziab kom qhuav tag nrho.

3. Gradient kub tswj hauv qhov cub kom qhuav

• Tsawg kub ntawm inlet - qeeb pib volatilization rau leveling.

• Nruab nrab kub nyob rau hauv nruab nrab cheeb tsam - tswj kom qhuav.

• Kub kub ntawm kev tawm - zaum kawg ceev shaping.

Tsis txhob hnov ​​​​qab cua sov ntawm qhov nkag - qhov no ua rau tawv nqaij sai.

4. Kev ntsuas ntxiv

• Tswj ambient humidity - tiv thaiv dej condensation ntawm zaj duab xis ntub dej.

• Kev kho mob corona online ntawm PTFE substrate - nce lub zog saum npoo, txhim kho cov ntub dej, txo cov dej dewetting.

Summary - Cov ntsiab lus tseem ceeb tswj rau txheej txheej zoo

Aokai PTFE optimizes txheej tsis - hnyav sib tov, ziab profile, thiab substrate pretreatment - los tsim PTFE daim kab xev nrog du, tsis xws luag-dawb nplaum txheej. Tiv tauj peb rau cov txheej txheem kev txhawb nqa lossis kev cai txheej tshwj xeeb.

Cov ntsiab lus saum toj no yog muab los ntawm Jiangsu Aokai Tshiab Materials Technology Co., Ltd.

Yog tias koj xav paub ntau ntxiv txog cov ncauj lus kom ntxaws, daim ntawv thov scenarios thiab cov kev daws teeb meem rau peb cov khoom lag luam tag nrho, suav nrog PTFE high-temperature fabrics, PTFE high-temperature tapes, PTFE mesh bets, seamless bonding machine belts, single-sided PTFE fabrics, high-temperature resistant conveyor bets thiab high-temperature fabrics, thov hu rau peb:

• Mr. Guo: +86 18944819998

• Mr. Liu: +86 13705266308

Peb ib txwm txhawb nqa lub tswv yim ntawm kev tshaj lij thiab kev ncaj ncees, thiab tau cog lus los muab kev daws teeb meem rau koj ib leeg thiab kev xav zoo.