Migumisiro yeEnvironment Humidity paPTFE Emulsion Impregnation

Muchigadzirwa chaicho chePTFE high-temperature jira neJiangsu Aokai New Materials, humidity yezvakatipoteredza inowanzodzorwa mukati mehuwandu hwe40 % -60% RH , hwakasanganiswa nemutemo wekushisa. Iyo evaporation rate inogadziriswa kuti ive yakaderera zvishoma pane capillary yekufambisa chiyero chemvura mu emulsion mukati me capillary network, kuve nechokwadi chekupinda kwakazara uye kuenzana kwe emulsion uchiwana hurema-isina, yakanyanya dense PTFE sintered mafirimu.

Mhedzisiro yakakosha yekunyorova kwezvakatipoteredza paPTFE emulsion impregnation iri mukusimba kwesimba pakati pemvura evaporation rate uye emulsion kugadzikana. PTFE emulsion inowanzova isiri yeNewtonian fluid inoumbwa nePTFE resin particles (dispersed phase), surfactants, stabilizers, uye mvura (inoenderera mberi chikamu). Senzvimbo yemamiriro ekunze, humidity inodzora volatilization kinetics ye solvent (mvura), ichiita zvakakosha mhedzisiro sezvizvi:

1. Migumisiro Yakakosha paImpregnation Process

Iyo impregnation nhanho inoda kuti emulsion inyatsopinda mukati me pores kana fiber gaps ye substrate (semuenzaniso, girazi fiber jira, metal mesh).

Low humidity environment : Mvura inoputika nekukasira, zvichiita kuti emulsion 'pamusoro-inooma' nekukasika pane substrate. Izvi zvakanyanya kuwedzera kuoneka viscosity ye emulsion pane iyo interface, ichitadzisa capillary kupinda mukati meiyo substrate yakadzika uye zvichikonzera 'kusakwana impregnation' - ndiko kuti, mabhegi emhepo akasara mukati me substrate. Zvichakadaro, kukurumidza kubuda kwemhepo kunobvisa huwandu hwekupisa, izvo zvinogona kukonzera kudzika kwetembiricha yemuno kamwe kamwe, kukanganisa emulsion thermodynamically uye kukonzeresa kunaya kwemvura, zvichitungamira ku 'pee reorenji' kana ukobvu husina kuenzana muchikamu chakaiswa.

High humidity environment : Mvura inoputika inodziviswa, uye emulsion inoramba iri munzvimbo yakaderera-viscosity yakanyorova pane substrate kwenguva yakawandisa. Kune ma substrates akatwasuka kana akarerekera, kudonha kuri nyore kunoitika pasi pesimba rinokwevera zvinhu pasi; kune yakanyanya hygroscopic substrates, hunyoro hwepamusoro hunogona kutadzisa kubuda kwegasi mukati meiyo substrate, kuumba ma microbubbles anokura kuita hurema hwepini panguva inotevera sintering.

2. Yakakosha Mhedzisiro paFinal Firimu-Kugadzira Hunhu

PTFE kuumbwa kwemafirimu kunowanzobatanidza matanho maviri: kuomeswa (kubvisa mvura) uye yakakwirira-tembiricha sintering (particle melting). Humidity inonyanya kukanganisa chimiro chemuviri wegirinhi panguva yekuomeswa, iyo 'yakagarwa nhaka' mufirimu yekupedzisira sintered.

Kutsemuka uye kushushikana kwemukati : Firimu kuumbwa kwePTFE resin zvimedu zvinotsamira pane capillary pressure panguva yekubuda kwemvura kuti inomesa zvimedu kuita dense yakarongedzwa layer. Kunyanya kuderera humidity kunokonzeresa kuwedzera kwakanyanya kwecapillary pressure gradient uye zvakanyanya kukurumidza kuomesa shrinkage, zvichiunza hombe tensile kushushikana kwemukati mukati megirinhi muviri. Sezvo PTFE ichishaya kugona kuzvirapa isati yaita sintering, kushushikana kwakadaro kunotungamirira ku microcracks kana macroscopic cracking mumuviri wakasvibira. Izvi zvakatsemuka hazvigone kubviswa mushure mekunyura, zvichikonzera kubuda kwemafirimu kana kuderedzwa kwesimba remagetsi.

Surfactant migration and residue : Surfactants (senge dzimwe nzira dzeperfluorooctanoic acid) iri mukutengeserana PTFE emulsions inotama nekubuda kwemvura panguva yekuoma. Nzvimbo ine hunyoro hwepamusoro inotambanudza hwindo rekuomeswa, ichibvumira nguva yakakwana yekuti surfactants aungane pamusoro, ichiita 'mafuta epamusoro anotsvedza' kana ganda rakaomarara. Kana iyi dhizaini isati yanyatsoora kana kunyungudutswa mukutanga sintering nhanho, ichave carbonized uye yakavharirwa mukati mefirimu, zvichikonzera yellowing, kuderedzwa density, uye zvakanyanya kushaya simba kunamatira pakati pePTFE uye substrate (yakashata interfacial bonding nekuda kwekusvibisa kuparadzaniswa).

Firimu density uye porosity : Firimu rakanakira PTFE rinofanira kunge risina pinho uye rakakora. Kudzora humidity kwakashata kunotungamira kune yakasara mwando injodzi huru. Pasi pehunyoro hwepamusoro, kana mvura isina kubviswa zvachose panguva yekupisa nekuoma, hunyoro hunosara hunoputika pakarepo panguva inotevera sintering (approx. 327-400 ° C) nekuwedzera kwehuwandu hwekuwedzera, kugadzira mabhomba kana mablister mukati mefirimu yakanyunguduka zvishoma. Sezvineiwo, pasi pehunyoro hwakanyanya kuderera, kuomeswa kwepasi nekukurumidza kunoumba ganda rakavharwa rinovharira kubuda kwemvura mukati, zvichikonzera mablisters kana delamination panguva yekunyungudika nekuda kwekuwanda kwemhute.

Muchidimbu, pesvedzero yekunyorova kwezvakatipoteredza paPTFE emulsion process inonyatso kupindira mumvura evaporation kinetics:

Hunyoro  hushoma (kuoma kwakanyanyisa)  kunokonzeresa: kusapinda zvakanaka, kuvharika kwemazinga (shrinkage cavities), kuomesa makatsemuka, uye kusagovera kuenzana kwezvisaririra zvepasi.

Kunyorova kwepamusoro  (kunyorova kwakanyanyisa)  kunokonzeresa: kudonha, kuwedzera kwepinhole, yakawandisa surfactant inoyangarara, mablistering mushure mekunyura, uye kuderera kunamatira.

Ruzivo rwuri pamusoro rwunopihwa neJiangsu Aokai New Materials Technology Co., Ltd.

Kune yakadzama paramita, mamiriro ekushandisa uye yakagadziridzwa mhinduro dzechigadzirwa chedu chakazara, zvinosanganisira PTFE yakakwirira-tembiricha jira, PTFE yakakwirira-tembiricha tepi, PTFE yakakwirira-tembiricha mesh bhandi, seamless laminating mabhandi, single-sided PTFE jira, yakakwirira-tembiricha isingachinjiki, girasi rinodzivirira, mabhandi anodzivirira, girazi rinodzivirira, girosi rinodzivirira, machira anopikisa

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