Rini PTFE adhesive tepi
Mamorekuru emhute yemvura madiki. Dzinogona kupararira kuburikidza netunzira tusingaoneki mvura yakawanda isingagoni. The real water vapor transmission rate (WVTR) yePTFE tepi inotsamira zvishoma pane PTFE's chemistry uye zvakawanda pacoating chimiro - kuremara senge micropores, microcracks, uye incomplete faibha encapsulation.
Aokai PTFE yakaongorora WVTR pamusoro pemaumbirwo ekuputira uye ukobvu. Chinyorwa ichi chinotsanangura kuti PTFE chimiro chemakemikari, kukanganisa kwekupfeka, makobvu maitiro, uye magadzirirwo ekuzadza zvinosangana sei kuona mhute inodzivirira kuita.
PTFE Chemical Structure - Zvese zviri zviviri Advantage uye Limitation
1. Zvakanakira - Hydrophobicity uye Crystallinity
Feature
Benefit kune Mvura Vapor Barrier
CF zvisungo, yakaderera pamusoro pesimba
Mamorekuru emvura haatombo adsorb kana kunyungudika pane PTFE pamusoro - chekutanga chipingamupinyi chinopesana nekupinda mwando.
Kupenya kwakanyanya (>90%)
Crystalline nzvimbo dzinenge dzisingapindike kumhute yemvura - hapana mamolecular diffusion nzira kuburikidza nemakristasi.
2. Zvisingakwanisi - Amorphous Domains uye Weak Intermolecular Forces
Simba risina simba pakati pePTFE molecular chain
Yakakura yemahara-vhoriyamu voids mune amorphous domains inogadzira nzira dzekupararira
Firimu rakachena rakasimba rePTFE rinoburitsa chete yepakati-level WVTR - yakaderera zvakanyanya kune PVDC kana EVOH
PTFE haisi yezvakasikwa yakakwana inodzivirira zvinhu
Muono wakakosha: Intrinsic PTFE chipinganidzo chiri pakati nepakati, kwete chakasiyana. Kushanda tepi kuita kunoenderana zvakanyanya nekukanganisa kwekupfeka.
Yakakosha Coating Defects - Micropores, Microcracks, uye Fiber Wicking
Ichi ndicho chinhu chikuru chinotonga maitiro ekuita zvipingamupinyi. Mazhinji PTFE adhesive matepi anogadzirwa kuburikidza nekupfekedzwa kana kupfekedzwa kwePTFE kuparadzirwa kunoteverwa nekupisa, panguva iyo zvikanganiso zvemukati zvinogadzirwa nyore nyore:
Defect Type
Formation Mechanism
Mhedzisiro paWVTR
Micropores
Voltilized solvents uye isina kukwana resin fusion inosiya yakabatana voids
Inogadzira nzira dzekudimbudzira dzekupinda kwemhute
Microcracks
Kupisa kwekuwedzera kusawirirana pakati pefiberglass substrate uye PTFE inokonzeresa kutsemuka mushure mekupisa / kutonhora.
Inovhura nzira dzakananga kuburikidza nekuputira
Capillary wicking yefibers
Iyo isina kukwana encapsulation yegirazi fibers inobvumira mhute yemvura kuti ifambe ichitevedza fiber-resin interface kuburikidza necapillary chiito.
Inogonesa kunzvenga kwemhute kwakatenderedza coating
Mhedziso inoshanda: Iyo yakazara WVTR yePTFE tepi yapera inodzorwa nekuremara density , kwete iyo yemukati pfuma yehuwandu hwePTFE resin.
Aokai PTFE inopa PTFE adhesive matepi ane inodzorwa coating density. Nezvezvishandiso zvinoda yakaderera WVTR (<15 g/m²·day), tinokurudzira giredhi yedu yakavharwa negiredhi, iyo inoshandisa mapasi matatu ekupfekera kuvhara zvakatevedzana kuvhara mapinho uye kuderedza microcrack density.
Coating Thickness uye Labyrinth Effect - Matanho ekuderedza WVTR
Kuwedzera kukoira kwekunamira kunowedzera mhute yekupinda nzira asi isingavharidzire huripo hurema hwega. Mamwe magadzirirwo anoshanda ekuvandudza akanyorwa pazasi:
Strategy
Mechanism
Kubudirira
Multi-layer coating
Kudzokororwa kupinza uye kunyunguduka kunogonesa anotevera ekupfekera machira kuti avhare mapini uye nekumisa kuremara nzvimbo dzejasi repasi.
High - inonyanya kushanda
Lamellar filler shanduko
Inert flaky fillers (mica poda, girazi flakes) inosanganiswa kuita PTFE coatings kumanikidza mamorekuru emvura kutora anotenderera (labyrinth effect)
Yakanyanya kukwirira - inocheka zvakanyanya WVTR
Kobvu imwe jasi
Yakareba nzira yekuparadzira asi hurema hunoramba huripo
Yakaderera - isingakurudzirwe yega
Yambiro ine mafirita: Yakawandisa mafirita kurodha kuchakanganisa kuchinjika uye isiri-tsvimbo chivakwa chezvakapera zvigadzirwa. Kuringana kunodiwa.
Surface Condition - Hydrophobic asi Kwete Sarudzo
Iyo hydrophobic PTFE coating ine yakakwira mvura yekubata angle (kazhinji 110-120 °), inodzora inoenderera yemvura kuumbwa kwefirimu pamusoro uye zvisina kunanga kudzikisa mhute inopinda inopinda kutyaira simba.
Zvisineyi: Iyi mukana wepamusoro haugone kudzima chipingamupinyi chakashata chinokonzerwa nekuremara kwemukati. Kana ma micropores kana makatsemuka aripo, mhute yemvura icharamba ichipararira zvisinei nepamusoro pe hydrophobicity.
Factor
Impact paWVTR
Kudzora Kunoshanda
Intrinsic PTFE crystallinity
Pakati pekutanga
Yakagadziriswa - isingadzoreki muchigadzirwa
Micropores kubva isina kukwana sintering
Yakakwirira (inogadzira mapfupi)
Gadzirisa sintering mbiri - inononoka kutonhora, yakakwirira tembiricha
Microcracks kubva pakupisa kwekuwedzera kusawirirana
Yakakwirira kwazvo
Multi-layer coating, yepakati FEP layer, inononoka kutonhora
Fiber wicking (isina kukwana encapsulation)
High
Ita shuwa kupfekedzwa kwakazara - vacuum inobatsira kune machira akakora
Coating thickness (imwe layer)
Low
Kwete kushanda chete
Multi-layer coating
Yakakwirira (inovhara kukanganisa)
Taura 2-4 impregnation inopfuura
Lamellar fillers (mica, girazi flakes)
Yakakwira kwazvo (labyrinth effect)
Wedzera 10-20 wt%, shongedza kupararira
Yakazadzwa + yakawanda-layer musanganiswa
Pamusoro (<10 g/m²·day)
Yakanakisa kune yakakosha barrier application
Yekupedzisira takeaway: Kana PTFE adhesive tepi inoiswa chisimbiso chepamusoro-humidity, process-induced coating flams (micropores, cracks, fiber wicking) inoramba iine hutera hukuru hwekugona kwayo kuvharira. Kuisa chisimbiso kwakavimbika kunoitwa kuburikidza ne densification kurapwa kunosanganisira akawanda-layer coating uye filler gadziriso . PTFE composite tepi inoshanda seyakavimbika yakawanda-inoshanda chipingamupinyi pasi pemamiriro akaomarara anoda kupisa kupisa kwakanyanya, kusadzivirirwa kwecorrosion, kugadzikana kwekunyorova, uye kwete-tsvimbo yekuburitsa kuita panguva imwe chete - asi kwete seyakamira-yakakwirira-yakakwirira barriers sesimbi foil kana PVDC.
Muchidimbu , iyo mvura mhute inovharira midziyo yePTFE inonamira tepi haina kutsanangurwa nePTFE's hydrophobicity chete. Intrinsic PTFE chidziviso chiri pakati nepakati (WVTR 5-10 g/m²·zuva refirimu risina kukanganisa). Zvakadaro, matepi anoshanda anotambura nemamicropores, microcracks (kubva pakupisa kwekuwedzera kusawirirana nefiberglass), uye fiber wicking - kukwidza WVTR kusvika 50-200 g/m²·day.
Kuti uwane yakaderera WVTR (<15 g/m² · zuva), tsanangura akawanda-layer coating (3+ impregnation passes) uye/kana lamellar filler gadziriso (10-20 wt% mica kana girazi flakes). Iyo labyrinth mhedzisiro kubva kune mafiritsi inomanikidza mhute yemvura kutora nzira dzinomonereka, ichideredza zvakanyanya kutapurirana. Nekudaro, kurodha kwekuzadza kwakakwira kunogona kuderedza kuchinjika uye kusaita-tsvimbo kuita - chiyero chinodiwa.
Unoda yakaderera-WVTR PTFE adhesive tepi yekunyorova-inonzwa chisimbiso? Aokai PTFE inopa akawanda-layer akavharidzirwa uye anozadza-akagadziridzwa mamakisi ane akanyorwa WVTR bvunzo data. Bata nesu neWVTR yako inodiwa, tembiricha yekushanda, uye zvido zvekuchinja.
Zvemukati zvinopihwa ne Jiangsu Aokai New Materials Technology Co., Ltd.
Kana iwe uchida yakadzama tekinoroji paramita, kutungamira kwekushandisa, uye zvigadziriso zvakagadziridzwa zvechigadzirwa chedu chizere chepodfolio zvinosanganisira PTFE high-temperature adhesive tepi, PTFE mesh conveyor bhandi, seamless fuser bhandi, single-sided PTFE jira, yakakwirira-tembiricha isingachinjiki bhandi rekutakura uye jira rekushisa
Tichitsigira uzivi hwebhizinesi hwehunyanzvi uye kutendeseka, tinozvipira kupa yakagadziridzwa imwe-stop mhinduro uye nekufunga kwevatengi sevhisi.
