Rini PTFE high-temperature adhesive tepi kukambaira. .
Kukambaira ndiko kunonoka, kwechigarire deformation yechinhu chiri pasi pekuremerwa nguva nenguva. Patembiricha yekamuri, PTFE tepi inogona kuita seyakagadzikana. Asi pa 200 ° C kana kunyange 260 ° C - maitiro ayo ekushanda - iyo inonamatira layer inogona kupfava uye kuyerera, uye PTFE substrate inogona kupinda 'kuyerera kwechando' (inokambaira pazasi pekunyungudika kwayo).
Aokai PTFE yakaedza hunhu hwekufamba muzviuru zvemaawa. Ichi chinyorwa chinotsanangura kuti zvinokambaira zvinoongororwa sei, kuti inonamira sei uye substrate imwe neimwe inopa, uye ndeapi magadzirirwo ematepi anoramba kunyura zvakanyanya.
Chii Chinokambaira muPTFE Tepi - Zviyero zviviri
Creep inoreva chaizvo mhinduro ye viscoelastic yezvinhu. Iyo yekunamatira layer uye substrate basa kuburikidza nenzira dzakasiyana, asi ese ari maviri anokanganisa zvakanyanya deformation kuramba.
Chikamu
Creep Mechanism
Zvinhu Zvikuru
Adhesive layer (silicone PSA)
Kuyerera kweViscous pasi pekunetseka kwekugera
Crosslink density, uremu hwemamorekuru, kusimbaradza kwekuzadza, ukobvu hwekuputira
Substrate (PTFE yakavharwa jira)
Cold flow (polymer chain sliding)
Fiberglass kusimbiswa, gadziriso yekuzadza, kunaka kwemukati
Mamiriro ekushanda dambudziko: PTFE matepi anowanzotarisana nemitoro yenguva dzose pa 200-260 ° C, kure nemuganhu wezvakajairwa zvinonamatira-sensitive adhesives. Kuwedzerwa kwepamusoro-tembiricha kuyedzwa kunodiwa.
Adhesive Layer Properties - Silicone PSA
Mazhinji PTFE adhesive matepi anotora silicone-based pressure-sensitive adhesives, ane yakakwirira-tembiricha inokambaira kuramba inotsamira pane zvinotevera zvinhu:
Factor
Mhedzisiro paCreep Resistance
Optimal Direction
Crosslink density
Yakakwirira kuyambuka mafomu akazara elastic network → yakaderera zvachose deformation
Wedzera (asi kwete zvakanyanya zvekuti tack yekutanga inorasika)
Molecular uremu & chimiro
Yakakwira molecular uremu + vinyl/phenyl gadziriso → yakagadziridzwa kusimba kwakabatana
Yakakwira MW, phenyl silicone yekupisa kukuru
Filler reinforcement (semuenzaniso, fumed silica)
Inowedzera simba rakabatana, inogonesa elastic rebound (serabha) vs. viscous kuyerera (sekutsenga chingamu)
Wedzera 5-15% inosimbisa filler
Adhesive coating ukobvu
Yakakora layer inobvumira kumwe kutsvedza kweshear → yakakwira inokambaira pasi pemutoro wakafanana
Shandisa yakaonda, yunifomu yekuputira kune anti-creep application
Interfacial adhesion
Kusabatana kwakashata kunokonzeresa kunamira kusvuura kubva kusubstrate → kutsvedza kwemukati (kwete kukwenya kwakawanda)
Shandisa silicone primer, simbisa nzvimbo yakachena
Key takeaway: Under-crosslinked silicone adhesive inotambura nekukasira kutadza kudonha patembiricha yakakwira. Matepi ekutanga anti-creep anoshandisa yakakwira-crosslink-density silicone ine inosimbisa mafirita uye inodzorwa yakatetepa coating.
Aokai PTFE high-temperature tepi inoshandisa yakakwirira-crosslink-density silicone PSA ine fumed silica reinforcement. Yakazvimiririra static shear kuyedzwa pa260 ° C (1000g mutoro, 12.5 × 25 mm kupindirana) inoratidza > maawa zana nemakumi mashanu kukundikana - yakakodzera kudiwa kwepamusoro-tembiricha inogara ichiremerwa zvikumbiro.
Substrate Properties – PTFE Coated Fiberglass vs. Pure PTFE Firimu
Maviri makuru ma substrates anoshandiswa pamatepi ePTFE, ane maitiro akasiyana zvakanyanya:
Substrate Type
Creep Resistance
Mechanism
Yakachena PTFE firimu
Murombo - anowanzozivikanwa kutonhora kuyerera (inotonhora inokambaira). Kunyangwe pasi pemitoro yakapfava inogara iri pazasi penzvimbo yekunyungudika (327 ° C), kushanduka kukuru kusingadzoreki kunoitika nekuda kwekutsvedza kweketani.
Isina kusimbiswa polymer → maketani anotsvedza achipfuura mumwe nemumwe pasi pekushushikana kwakasimba
Fiberglass jira rakamisikidzwa nePTFE (rinotungamira kune yakakwirira-tembiricha tepi)
Yakanakisa - yakarukwa fiberglass skeleton zvinobudirira inhibits PTFE kutonhora kuyerera
Composite chimiro: girazi fibers inotakura mutoro, PTFE inopa isiri-tsvimbo
Kune fiberglass-yakasimbiswa substrate, creep kuramba inotemwa ne:
Factor
Mhedzisiro
Weave density uye ukobvu
Machira ane huremu hwepamusoro, anorema-huremu → yakakwirira tensile modulus → yakaderera inokambaira
Yakagadziridzwa yakazadzwa PTFE
Zvinowedzerwa (fiberglass poda, graphite, kabhoni fiber) inorambidza PTFE mamorekuru kufamba → wedzera substrate kusimba uye kutsika kuramba.
Kurapa kwemucheka & kupfekedzwa kwakazara
Yakazara sintered PTFE yakazara yakavharira fiberglass mafomu akabatanidzwa akaumbwa kudzivirira interlayer shear kutsvedza. Kusakwana kupinza → yakasara PTFE mukati mejira meshes inokambaira pasi pemutoro
Substrate ukobvu & flatness
Makobvu, akaenzana akafuratira → yakakwirira flexural rigidity → kunyangwe kupararira kwekushushikana → kunodzivirira kunogara kusati kwasvika kubva mukushushikana mupfungwa.
Kiyi yekutora: Yekugara-kuremerwa-yepamusoro-tembiricha maapplication, usamboshandisa yakachena PTEF firimu tepi - inokambaira isingadzokeki. Nguva dzose sarudza fiberglass-yakasimbiswa PTFE tepi .
Pfupiso - Maitiro ekuve nechokwadi cheCreep Resistance muPTFE Tepi
Factor
Zvekutsvaga
Zvokudzivisa
Adhesive type
Yakakwira-crosslink-density silicone PSA ine fumed silica filler
Under-crosslinked silicone, acrylic PSA (inokambaira pane yakaderera temp)
Adhesive ukobvu
Mutete, yunifomu yekupfeka (chinangwa 0.02-0.05 mm)
Gobvu inonamira layer (> 0.08 mm) - inobvumira shear kutsvedza
Substrate mhando
Fiberglass-yakasimbiswa PTFE
Yakachena PTFE firimu (inotonhora inokambaira)
Substrate quality
High-density weave, yakazara mimba, yakazara sintered
Loose weave, insufficient impregnation, partially sintered
Interfacial bonding
Primer kurapwa pakati pekunamatira uye substrate
Hapana primer → inonamira inosvuura pachinzvimbo chekukambaira kwakawanda
Kurudziro inoshanda: Yekugara-kuremerwa-yepamusoro-tembiricha maapplication (semuenzaniso, pombi insulation yekuputira pasi pekushushikana, kubata zvinhu pamaplaten anopisa), kumbira static shear data pane yako chaiyo tembiricha uye mutoro. Taura tepi yefiberglass-yakasimbiswa PTFE, kwete tepi yefirimu. Tarisa kuti inonamira yakakwira-crosslink-density silicone ine filler.
Muchidimbu , iyo inokambaira kuramba yePTFE yakakwirira-tembiricha inonamira tepi pasi penguva refu inogara ichiremerwa zvinoenderana nezvikamu zviviri. Iyo silicone PSA layer inofanirwa kunge iine yakakwira crosslink density, inosimbisa mafirita (fumed silica), uye yakatetepa yunifomu yekujamba kuti irambe viscous kuyerera. Iyo substrate inofanirwa kuve yefiberglass-yakasimbiswa PTFE - yakachena PTFE firimu ichaenda isingadzoreki inotonhora inokambaira pakupisa kwakanyanya. Iyo fiberglass skeleton inotakura mutoro uye inochengeta iyo composite yakagadzikana.
Paunenge uchisarudza PTFE tepi yekugara-mutoro wepamusoro-tembiricha zvikumbiro, usambofa wakagadzikana kune yakachena PTFE firimu tepi. Gara uchikumbira static shear data pane yako tembiricha yekushandisa. Uye rangarira: chisungo pakati pekunamira uye substrate zvinhu zvakare - primer-yakarapwa nzvimbo inodzivirira inodzivirira kutsvedza kwemukati.
Unoda tepi-inodzivirira PTFE tepi yepamusoro-yekushisa inogara ichiremerwa? Aokai PTFE inopa fiberglass-yakasimbiswa tepi ine high-crosslink-density silicone PSA, yakasimbiswa ne260°C static shear test. Bata nesu nemutoro wako, tembiricha, uye nguva yenguva.
Chinyorwa chakapihwa ne Jiangsu Aokai New Materials Technology Co., Ltd.
Kana iwe uchida mamwe maratidziro, madhairekitori ekushandisa, uye zvigadziriso zvakagadziridzwa zvechigadzirwa chedu chizere mutsara unosanganisira PTFE yakakwirira-tembiricha jira, PTFE adhesive tepi, PTFE mesh conveyor bhandi, isina musono fuser bhandi, single-sided PTFE jira, yakakwirira-tembiricha inodzivirira bhandi uye kupisa-inodzivirira fiberglass kuti ubate jira:
Isu tinoomerera kune hunyanzvi uye kutendeseka, yakatsaurirwa kuendesa imwe-yekumira yakagadziridzwa mhinduro uye nehanya mushure mekutengesa-rutsigiro!
