Iyo Solvent Volatilization Rate Inobata sei PTFE Tape Coating Hunhu

Mukugadzirwa kwe PTFE high-temperature tepi , iyo silicone pressure-sensitive adhesive inoshandiswa seyakagadziriswa-based solution. Sezvo tepi yakavharidzirwa inofamba nepakati pevheni yekuomesa, solvent inoputika, ichisiya shure kwekunamatira kwakasimba. Muyero unoitika izvi - solvent volatilization rate - iri musimboti process parameter inotaridza kana iyo yekupedzisira inonamira nzvimbo yakatsetseka, isina hurema, uye inongogara gobvu, kana yakavharwa mumapinhole, craters, uye mitsetse.

Aokai PTFE yakagadziridza maitiro ekubikira muzviuru zvemaitirwo ekugadzira. Gwaro iri rinotsanangura mabatiro anoita chiyero chekusimudzira, kuumbwa kwepini, uye kukanganisa kwe crater - uye kuti ungaidzora sei yemhando yepamusoro yePTFE tepi.

Mabatiro eVolatilization Rate Inokanganisa Kukwirisa - Iyo Viscosity Trade-Off

Kukwirisa ndiko kugona kwefirimu rinonamira rakanyorova kuti ribvise mitsetse yekuvhara, mitsetse yakachinjika, uye orenji-peel magadzirirwo, achigadzira nzvimbo yakatsetseka. Simba rinotyaira kudzvinyirirwa kwepamusoro; kupikisa ndiko viscosity.

1. Kukurumidza - ganda repamusoro rinomira kuenzana

Kana solvent ikabuda nekukasira, iyo solvent iri pamusoro inodonha nekukurumidza. Silicone PSA (yakakwirira-molecular-huremu polysiloxane mhinduro) inonyanya kugadzikana-inonzwa. The surface layer viscosity inokwira exponentially - kunyange kugadzira high-viscosity 'ganda' rinenge pakarepo.

Ganda iri rinovharira chinonamira chepasi chisina kupora panzvimbo. Iyo inonamira haichakwanise kuyerera kuti ienderere kunze mitsetse kana mablade mamaki. Zvisizvo zvinyorwa zvinogadzirwa panguva yekuputira zvinogadziriswa zvachose.

2. Kunonoka - kuderera uye kunyorova

Kana solvent ikanyungudika zvishoma nezvishoma, iyo inonamira layer inoramba iri yakaderera-viscosity mvura kwenguva yakareba. Kunyange izvi zvichibvumira nguva yekuenzanisa, simba rinokwevera zvinhu pasi rinokonzera:

• Sagging (inonamira inodzika ichidzika panzvimbo yakatwasuka)

• Mipendero yakakora (madziva anonamira pamicheto yenzvimbo yakavharwa)

• Dewetting - pa low-surface-energy PTFE substrates (critical surface tension only 18-20 mN/m), kunyorova kwenguva refu kunogona kuita kuti kunamira kudonhe uye kukwevera kure kubva kune substrate, kuparadza nzvimbo yakatsetseka.

Sei Volatilization Rate Inokonzera Pinholes

Pinholes maburi madiki kuburikidza neadhesive layer. Iwo anoumba apo zvinonyungudutsa kana mabhuru emhepo anovharirwa uye anoputika nepamusoro penzvimbo yakaomeswa isati yanamira ichiyerera.

1. Mechanism 1 - inopisa solvent yakavharirwa pasi peganda

Kana tepi yakavharwa ichipinda muovheni yekuomesa, tembiricha yakapinza inokwira yakasanganiswa ne-ultra-fast solvent volatilization inorapa firimu pamusoro pekutanga. Solvent yakavharirwa mukati memutsetse inoputika zvine chisimba, ichigadzira mabhuru. Kamwe mukati mebubble remukati rinopwanya ganda rakaomeswa repamusoro, iro rakaputika firimu remvura harigone kuyerera uye kupora - richisiya mapinho echigarire kana makorokoza akafanana nekuputika.

2. Mechanism 2 - mabubbles haagoni kupukunyuka

Madiki emhepo mabhuru anogara akavharirwa panguva yekuputira uye yekunamatira kudya. Vanoda nguva yakakwana yekuyangarara kumusoro, kuputika, uye kuporesa pane yakaderera viscosity. Kana iyo ganda repamusoro rakakurumidza kuoma nekuda kwekuoma, mabhuru haakwanise kutiza uye anogadzikwa semapini.

3. Mechanism 3 - kunyorova kwakashata kwe micro-pits

Early kukurumidza volatilization spikes adhesive viscosity zvakapinza, kunyima mhinduro yekukwanisa kuzadza zvishoma nezvishoma madiki-makomba uye kudzinga mhepo yemukati. Izvi zvinoguma nekuremerwa kwepinhole-kunge kunyorova kwekunyorova mushure mekuoma.

Maitiro eVolatilization Rate Inokonzeresa Craters (Dimples)

Makoronga madiki, akatenderedzwa akatenderedzwa pane anonamira pamusoro, akasiyana nemapinikoni. Zvinokonzerwa nekusagadzikana kwenzvimbo.

1. Mechanism 1 - madonhwe emvura akakomberedzwa

Rapid solvent volatilization inotora kupisa kukuru kwe vaporization, kutonhora zvakanyanya firimu rakanyorova uye substrate pamusoro. Kana tembiricha ikadonha pazasi pedova, mhute yemvura iri mumhepo inoungana kuita madonhwe madiki pafirimu rakanyorova.

• Kushushikana kwepamusoro pemvura: ~ 72 mN/m

• Surface tension of silicone adhesive: 20-25 mN / m

Uyu musiyano muhombe unogadzira tension gradient yemuno inotyaira yakatenderedza adhesive kuti iende kure nemadonhwe, ichisiya craters mushure mekuoma.

2. Mechanism 2 - tsvina-induced craters

Low-surface-tension contaminants (silicone micro-droplets, girisi) zvinogara zviripo mukunamatira kana nharaunda yekushanda. Izvi zvinosvibisa zvinoumba nzvimbo dzakaderera-pamusoro-tension pafirimu remvura. Pasi peMarangoni mhedzisiro, inonamira inoyerera ichibuda kunze kubva munzvimbo idzi, ichigadzira madhiri.

• Moderate volatilization inobvumira madhiri kuti azviporese kuburikidza neadhesive backflow.

• Kunyanya kukurumidza kuvhuvhuta kunobvisa mvura yekuyerera isati yapora - ma craters akavharwa zvachose.

3. Mechanism 3 - dewetting craters kubva pakusakwana weti

PTFE substrates dzine kunetsa kwepamusoro kwe18–20 mN/m chete - padanho rekunyorova kunokwanisika. Iyo silicone adhesive inoda yakakwana yakaderera-viscosity hwindo kuti ipararire uye kunyorovesa pamusoro thermodynamically. Kana solvent ikakurumidza kunyungudika, chinonamira chinorasikirwa nekunyorova kusati kwanyatsonyorova. Panguva yekuomeswa, kuderera kwevhoriyamu uye kusimba kwepasi kunomanikidza kunamira kuti zvibvumirane, zvichisiya ma micro-crater panzvimbo dzisina kunyorova - inoonekwa seyakaiswa mucherechedzo.

Mhinduro - Maitiro ekudzora Volatilization ye Defect-Yemahara Coating

Iyo yakanaka solvent volatilization zano rinoshandisa gradient chiyero :

1. Matanho maviri ekuomesa nzira

2. Mixed solvent systems

Shandisa musanganiswa wezvinonyungudutsa zvine mapoinzi akasiyana ekuvira:

• High-boiling, inononoka-evaporating yakanaka solvents (toluene, xylene, kana yepamusoro-boiling aromatics / esters) - chikamu chikuru - inovimbisa kunyungudika uye nguva yakakwana yekuenzanisa.

• Diki shoma yepakati / yakaderera-inofashama inokurumidza-kuomesa zvinonyungudutsa - yakasanganiswa kugadzirisa yakazara kuomesa kumhanya.

3. Gradient tembiricha kutonga muchoto kuomesa

• Kudzikira tembiricha pakupinza - kunonoka kwekutanga kuvhuvhuta kwekuyera.

• Medium tembiricha munzvimbo yepakati - inodzorwa kuomesa.

• Kupisa kwepamusoro pakubuda - kuumbwa kwekupedzisira nekukurumidza.

Dzivisa kupisa kwakapinza pachikamu chekupinza - izvi zvinokonzeresa ganda rinokurumidza.

4. Ancillary matanho

• Kudzora ambient humidity - kudzivirira mvura condensation pamvura firimu.

• Online corona kurapwa kwePTFE substrate - inosimudza simba repamusoro, inovandudza kunyorova, inoderedza dewetting craters.

Pfupiso - Makiyi Ekudzora Mapoinzi eKupfeka Hunhu

Aokai PTFE inogadziridza maparamendi ekubatisa - solvent blend, drying profile, uye substrate pretreatment - kugadzira PTFE tepi ine yakatsetseka, isina kukanganisa-inonamira layer. Bata isu kuti tiwane tsigiro yeprotocol kana tsika yekupfekedza yakatarwa.

Zviri pamusoro apa zvinopihwa ne Jiangsu Aokai New Materials Technology Co., Ltd.

Kana iwe uchida kudzidza zvakawanda pamusoro pezvakatsanangurwa zvakatsanangurwa, mamiriro ekushandiswa uye zvigadziriso zvakagadzirirwa zvechigadzirwa chedu chizere, kusanganisira PTFE machira ekushisa, PTFE high-temperature matepi, PTFE mesh mabhandi, seamless bonding machine bhandi, single-sided PTFE jira, yakakwirira-tembiricha inodzivirira girasi rekutakura, uye bhanhire rinopikisa re-conveyor.

• VaGuo: +86 18944819998

• Mr. Liu: +86 13705266308

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