Maitiro eSilicone Adhesive Tg Inokanganisa PTFE Tepi Kuita paKudzika Kwekupisa

Wakamboedza kushandisa tepi yakajairwa mufiriji? Inoshanduka kuoma, inorasa kunamira, uye inotsemuka kana yakakotama. For PTFE high-temperature tepi inoshandiswa munzvimbo dzakadzika-kupisa - kubva kunotonhora kusvika kune cryogenic pipelines - the adhesive's glass transition temperature (Tg) inoita mutsauko wose.

Silicone pressure-sensitive adhesive ine yakanyanya kuderera Tg inosvika -120°C . Ichi ndicho chikonzero chakavanzika nei PTFE tepi ichiramba ichichinjika uye inonamira patembiricha yakaderera se -70°C.

Aokai PTFE akadzidza ichi chivakwa zvakanyanya. Ichi chinyorwa chinotsanangura sainzi kuseri kweTg uye kuti inokanganisa sei tepi kuita mumamiriro ekutonhora.

Chii chinonzi Glass Transition Temperature (Tg) uye Nei Zvine Basa?

Iyo tembiricha yegirazi (Tg) ndiyo polima inoshanduka kubva payakapfava, ine rubbery state kuenda kune yakaoma, brittle glassy state . Kana tembiricha yadonha pazasi Tg, polymer molecular cheni inotonhora, ichirasikirwa nekuyerera uye kugona kunamatira.

Zvekunamira zvinonzwa kumanikidza:

• Pamusoro Tg: Cheni dzinofamba zvakasununguka → chinonamira chinogara chakapfava, chinonamira, uye chinogona kunyorova panzvimbo

• Pazasi Tg: Cheni dzakaoma chando

Nei silicone PSA yakakosha: Tg yayo ye -120 ° C yakaderera zvakanyanya kana ichienzaniswa neyakanamatira adhesives (Tg kutenderera -20 ° C kusvika -30 ° C). Izvi zvinoreva kuti silicone inoramba yakanyungudika uye inonamira patembiricha yakapamhama - kubva -70°C kusvika 260°C.

Hukama huri pakati peTg uye kuita kwekunamira hakusi nyore pa/kudzima switch. Kunyange 30 ° C pamusoro peTg, kufamba kwema molecular kuchiri kushoma; chinonamira chinogona kunge chiri 'dehwe' pane kuita rabha rakazara. Pamashandisirwo ematepi ePTFE pazasi -50°C, chinonamira chinofanira kuchengetedza 'rubbery plateau' modulus iri pakati pe10⁴ ne10⁶ Pa. Silicone PSA inobudirira izvi kusvika pa -80°C nekuda kwekuchinjika kwayo siloxane musana (–Si–O–Si–). Acrylic adhesives, ane kabhoni-carbon backbones yakaoma, kazhinji inorasa tack pazasi -30°C. Izvi zvinotsanangura kuti sei chete silicone-based PTFE matepi anokurudzirwa kune efiriza application (-30 ° C kusvika 0 ° C) kana cryogenic nharaunda.

Microscopic Kufurira Mechanism yeTg paPTFE Tepi

Iyo yakazara yakaderera-yekushisa tepi yePTFE yakakwirira-tembiricha tepi inotsanangurwa pamwe chete nezvose zviri zviviri adhesive layer uye PTFE substrate . PTFE pachayo inewo Tg yeanenge -120 ° C - zvinoshamisa zvakafanana nesilicone PSA.

Muono wakakosha: Chero bedzi tembiricha yebasa ikaramba iri kure pamusoro peTg (semuenzaniso, -70 ° C, iri 50 ° C pamusoro -120 ° C), zvese zvinonamira uye substrate zvinoramba zviri muhunyoro hwakatsetseka, zvichivimbisa yakanakisa kudzika-tembiricha kuchinjika uye kugadzikana kwakagadzikana.

Aokai PTFE's thermal analysis lab yakasimbisa kuti silicone PSA inochengetedza pamusoro pe80% yekamuri-tembiricha yeganda simba pa -70°C, ukuwo acrylic PSA inorasika inopfuura 90% pazasi -30°C. Iyi data inoenderana nemusiyano weTg.

Mukushandiswa chaiko cryogenic (semuenzaniso, tepi yemasiki yepasi-tembiricha yeplasma yekupfapfaidza kana kugadzirisa kwenguva pfupi mumvura ine nitrogen dewars), vashandisi vanowanzo kanganisa kukanganisa firimu rePTFE rekutsemuka apo muparidzi chaiye ari adhesive. Kana iyo yekunamatira ichiomesa pasi peTg yayo, inorasikirwa nekuteerera uye haigone kutora kubhenda kunetseka. Iyo strain inozoenda kune PTFE substrate, iyo inogona kunge ichiri kuchinjika, asi iyo yakaomesesa yeadhesive layer inoshanda senge stress concentrator, ichitanga kuputika pane adhesive-substrate interface. Mhinduro yacho haisi yekushandisa yakakora PTFE firimu, asi kuve nechokwadi chekunamatira kunoramba kuri pamusoro peTg yayo. Kune yakanyanya cryogenic mamiriro pazasi -150 ° C, kunyange silicone PSA inova marginal. Muzviitiko zvakadaro, mechanical fasting (clamps, screws) kana adhesive-isina PTFE matepi anokurudzirwa, sezvo pasina PSA inogona kushanda pasi -180 ° C.

Impact pane Yakaderera-Tembiricha Adhesion uye Flexibility

1. Kunamatira paTembiricha Yakasiyana

2. Low-Temperature Flexibility

I-ultra-low Tg (-120 ° C) inoita kuti chinamatira chichengetedze elasticity uye kupfava kunyange pa -70 ° C, zvinobudirira kudzivirira kuputika kwebrittle. Iyo tepi inogona kukotama, kuputirwa, uye kukuvara zvakasununguka pasina brittle kutyoka - kusiyana neakajairika matepi anonamira anotsemuka munzvimbo dzinotonhora.

Pfupiso & Mirayiridzo yekushandisa

Iyo yakaderera girazi shanduko tembiricha yesilicone PSA inogonesa PTFE yakakwirira-tembiricha tepi kuchengetedza yakagadzikana viscosity uye kuchinjika pasi pepasi-tembiricha mamiriro.

Sarudzo gwara netembiricha renji:

Kuchengeta & Mashandisiro Notes:

• Chengetedza tepi hermetically munzvimbo dzinotonhorera, dzakaoma maererano nehunyanzvi hwekuita

• Kune yakaderera-tembiricha application (semuenzaniso, kuisa tepi munzvimbo inotonhora), preheat zvese tepi uye iyo yekubatanidza pamusoro kuti uvandudze kunamatira kwekutanga.

• Dzivisa kuisa tepi pazasi 0 ° C pasina kudziya - kunyangwe silicone PSA inoda kubatwa kwekutanga pamusoro peTg yekunyorova kwakakodzera.

Muchidimbu , iyo tembiricha yegirazi-yakaderera yegirazi (-120 ° C) yesilicone inoomesa-inonzwa inonamira ndiyo inoita kuti PTFE yakakwirira-tembiricha tepi inyatsokodzera kutonhora uye cryogenic nharaunda. Nepo matepi e acrylic achitadza pazasi -30°C, silicone-based PTFE tepi inoramba ichichinjika uye inonamira kusvika -70°C - uye inogona kurarama kudziya kwakadzikira nekunamira kwakaderedzwa.

Kune akawanda maindasitiri anotonhora maapplication (mafiriza, inotonhora cheni michina, kuiswa kwekunze munguva yechando), yakajairwa PTFE tepi ine silicone PSA inoshanda zvakavimbika. Nokuda kwebasa rakadzika re cryogenic, bvunza nyanzvi - uye funga kugadzirisa mechanical pazasi -150 ° C.

Unoda tepi yePTFE yekushandisa yakaderera-tembiricha? Aokai PTFE inopa akajairwa uye akagadziridzwa mamakisi enzvimbo dzakasiyana dzinotonhora. Bata yedu tekinoroji timu neako tembiricha renji uye basa kutenderera.

Yakabudiswa neJiangsu Aokai New Materials Technology Co., Ltd.

Kuti uwane yakadzama paramita, mamiriro ekushandisa, uye yakagadziridzwa mhinduro yezvizere-yakatevedzana zvigadzirwa zvinosanganisira PTFE yakakwirira tembiricha tepi, PTFE mesh bhandi, seamless fusing bhandi, single-sided PTFE jira, tembiricha isingachinji bhandi uye fiberglass machira , ndapota taura nesu:

• VaGuo: +86 18944819998

• Mr. Liu: +86 13705266308

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