Dab tsi Ua Cracking hauv PTFE Impregnation Txheej Txheem?

Raws li cov kws tshaj lij cov chaw tsim khoom ntawm PTFE high-temperature fabrics, Jiangsu Aokai Cov Khoom Tshiab yuav piav qhia qhov ua rau tawg hauv iav fiber ntau daim ntaub tom qab impregnation nrog PTFE (polytetrafluoroethylene) emulsion. Qhov no yog ib qho teeb meem tshwm sim hauv kev tsim cov khoom sib xyaw, uas feem ntau tshwm sim thaum ziab (tshem tawm cov dej noo thiab surfactants) los yog kub-kub sintering (melting PTFE hais mus rau hauv ib tug tas mus li zaj duab xis).

1. Kev tsis sib haum xeeb ntawm cov thermal expansion coefficients

Qhov no yog lub hauv paus ua rau lub cev.

Muaj qhov sib txawv loj hauv thermal expansion coefficients ntawm iav fiber ntau thiab PTFE: linear expansion coefficient ntawm iav fiber ntau yog kwv yees li 5 × 10⁻⁶ / ℃ , thaum PTFE yog li ntawm 100 × 10⁻⁶ / ℃ rau 200 × 10⁻⁶ / ℃  (kwv yees 20 npaug ntawm cov iav fiber ntau).

Thaum lub sij hawm txias (los ntawm ib tug sintering kub ntawm kwv yees li 380 ℃ ~ 400 ℃ mus rau hauv chav tsev kub), PTFE shrinks deb ntau ho ntau dua li cov iav fiber ntau. Txij li cov ntaub iav fiber ntau ua raws li cov pob txha pob txha, PTFE raug txwv thaum lub sij hawm shrinkage, ua rau muaj kev ntxhov siab hauv tensile thermal. Thaum qhov kev ntxhov siab no dhau ntawm lub zog tensile ntawm PTFE zaj duab xis los yog lub zog sib txuas ntawm PTFE thiab iav fiber ntau, tawg tshwm sim los tso tawm qhov kev ntxhov siab.

2. Kev tswj tsis raug ntawm kev ziab thiab sintering txheej txheem

Kev ntsuas cua sov ntawm cov khoom impregnated ncaj qha cuam tshuam rau kev tawg:

·  Cov cua kub ceev heev : tshwj xeeb tshaj yog nyob ib ncig ntawm 100 ℃ (vaporization sai ntawm ya raws) thiab 200 ℃ - 250 ℃ (decomposition ntawm surfactants nyob rau hauv emulsion thiab crystalline hloov chaw ua ntej PTFE sintering). Cov cua kub ceev ua rau muaj kev ntxhov siab sab hauv thiab cov pa cuam tshuam los ntawm kev hloov pauv sai ntawm cov kuab tshuaj thiab cov tshuaj ntxiv, ua rau txheej txheej tawg.

·  Cov cua txias ntau dhau : Kev raug cua ncaj qha rau ambient cua txias sai tom qab sintering ua rau muaj kev ntxhov siab sai sai vim qhov kub thiab txias sib txawv, uas yooj yim induces nplua network tawg.

·  Kev kub siab sintering ntau dhau los yog lub sij hawm sintering ntev heev : Qhov no ua rau degradation ntawm PTFE molecular hnyav thiab ntau fluidity, ua rau cov khoom muaj feem cuam tshuam rau kev tawg hauv kev ntxhov siab.

3. Cov teeb meem hauv txheej txheem Impregnation thiab Emulsion Concentration

Lub thickness, uniformity thiab nkag mus tob ntawm impregnated txheej ncaj qha cuam tshuam rau kev tawg rhiab heev:

·  Cov tuab tuab heev ib txheej impregnation : Nyob rau hauv kev nrhiav cov thickness los yog ntau lawm efficiency, ib tug overly tuab PTFE txheej yog thov nyob rau hauv ib tug pass. Thaum lub sij hawm ziab thiab sintering, cov txheej tuab muaj txoj hauv kev ntev dua rau kev tshem tawm cov kuab tshuaj thiab ua rau muaj qhov ntim ntau dua (PTFE emulsion feem ntau muaj cov ntsiab lus ntawm 60%, txhais tau hais tias kwv yees li 40% noo noo yuav tsum raug tshem tawm), uas feem ntau ua rau tawg.

·  Tsis sib npaug impregnation : Localized ntau dhau PTFE buildup los yog tsis sib xws emulsion tis ntawm cov ntaub nto ua rau cov concentrated shrinkage kev nyuaj siab.

·  Tsis txaus emulsion nkag mus : Yog hais tias iav fiber ntau daim ntaub tsis dewaxed los yog tsis zoo nto-kho, PTFE emulsion tsis tau nkag mus rau hauv fiber ntau bundles thiab tsuas yog tsim ib tug superficial 'dawb zaj duab xis'. Cov yeeb yaj kiab no muaj qhov tsis muaj zog anchoring nrog lub substrate thiab nyiam detach los yog tawg thaum rhuab.

4. Substrate-Related Factors

·  Unde-waxed iav fiber ntaub : iav fiber ntau daim ntaub muaj sizing agents (paraffin, epoxy, thiab lwm yam.) los ntawm cov txheej txheem weaving. Tsis muaj qhov kub thiab txias dewaxing los yog tshuaj ntxuav ua ntej impregnation, cov organic tshuaj carbonize thiab volatilize thaum lub sij hawm tom qab sintering, generating roj uas ruptures lub txheej los yog tsis muaj zog cov kev sib raug zoo ntawm PTFE thiab iav fiber, ua rau tawg.

·  Cov qauv thiab tuab ntawm cov ntaub iav fiber ntau : Thicker thiab denser iav fiber ntau daim ntaub (xws li cov ntaub satin tuab) nthuav tawm ntau dua rigidity thiab muaj zog tuav ntawm PTFE shrinkage. Lub caij no, cov grooves sib sib zog nqus ntawm cov pob fiber ntau yuav ua rau muaj kev ntxhov siab thiab tawg ntawm cov npoo npoo thaum ziab.

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

Rau cov ncauj lus kom ntxaws, daim ntawv thov scenarios thiab customized kev daws teeb meem ntawm peb cov khoom tag nrho - suav nrog PTFE high-temperature ntaub, PTFE high-temperature tape, PTFE high-temperature mesh belt, seamless belts for bonding machines, one-sided PTFE fabric, high-temperature resistant conveyor belts, high-temperature mesh belt, high-temperature mesh belt, seamless belts for bonding machines, one-sided PTFE fabric, high-temperature resistant conveyor bets, high-temperature contact us

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