Vim li cas PTFE Cov Khaub Ncaws Kub Kub Ua Rau Cov Khaub Ncaws Uas Nyuaj Thiab Ua Rau Tom Qab Siv Lub Sij Hawm Ntev?

Jiangsu Aokai Cov Khoom Tshiab, cov chaw tsim khoom ntawm PTFE high-temperature daim ntaub, piav qhia txog hardening thiab embrittlement ntawm PTFE high-temperature daim ntaub tom qab lub sij hawm ntev-kub qhov kev pab cuam los ntawm peb txoj kev xav: polymer saw so, cross-linking, thiab degradation . Nws yuav tsum tau muab sau tseg tias cov khoom tseem ceeb ntawm PTFE high-temperature daim ntaub yog polytetrafluoroethylene (PTFE), thiab cov nram qab no tsom xam rau cov kev hloov microstructural ntawm PTFE high-temperature ntaub.

I. Molecular Chain Relaxation (Physical Aging)

Thaum qhov kub thiab txias, kev txav mus los ntawm cov saw hlau molecular hauv thaj tsam amorphous ntawm PTFE cov ntaub kub kub nce, thiab lawv maj mam hloov mus rau hauv lub xeev crystalline ntau dua, uas ua rau muaj crystallinity ntau dua. Cov txheej txheem kev so ntawm cov saw no txo ​​qis kev txav mus los ntawm cov ntu molecular hauv PTFE cov ntaub ntawv kub kub, uas macroscopically manifests raws li cov khoom hloov pauv los ntawm hloov mus rau qhov nyuaj thiab nkig.

II. Kev sib txuas lus sib txuas

Thaum PTFE cov ntaub ntawv kub-kub raug rau qhov kub siab ntev ntev (tshwj xeeb tshaj yog nyob ze lossis tshaj nws cov kev pabcuam sab saud), thaum muaj cov pa oxygen lossis hluav taws xob, PTFE molecules poob fluorine atoms los tsim cov dawb radicals, uas tom qab ntawd ua rau muaj kev sib txuas ntawm kev sib txuas. Kev sib txuas sib txuas ncaj qha txwv tsis pub tus txheeb ze zawv zawg ntawm cov saw hlau molecular hauv PTFE cov ntaub kub kub, ua rau nws poob yooj yim. Qhov no yog ib qho ntawm cov laj thawj tseem ceeb rau kev ua kom tawv thiab embrittlement ntawm PTFE high-temperature daim ntaub.

III. Degradation Reaction

Nyob rau hauv qhov kub thiab txias dua los yog nyob rau hauv lub xub ntiag ntawm oxygen, lub ntsiab chains ntawm PTFE high-temperature daim ntaub so thiab degrade, ua tsis tshua muaj-molecular-qhov hnyav fragments thiab tso fluoride gases. Txawm hais tias cov khoom yuav soften pib, tsis tu ncua degradation ua rau ib tug ntse poob nyob rau hauv molecular hnyav thiab kev puas tsuaj rau tus thawj crystalline qauv. Thaum kawg, qhov saum npoo ntawm PTFE kub-kub daim ntaub hmoov, tawg, thiab qhia irreversible embrittlement.

Summary : Thaum PTFE cov ntaub ntawv kub-kub yog rhuab rau ib lub sij hawm ntev, chain so (crystallization) thiab cross-linking ua ke ua rau hardening thiab poob ntawm toughness; nyob rau hauv hnyav tej yam kev mob, degradation ntxiv rhuav tshem cov qauv kev ncaj ncees. Kev sib xyaw ua ke ntawm peb yam no thaum kawg ua rau PTFE cov ntaub ntawv kub thiab nkig.

Cov ntaub ntawv saum toj no yog muab los ntawm Jiangsu Aokai New Materials Technology Co., Ltd.

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