Dab tsi ua rau tawg hauv PTFE Impregnation txheej txheem?

Raws li cov kws tshaj lij kev 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 siv sib xyaw, uas feem ntau tshwm sim thaum ziab (tshem tawm ntawm ya raws 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 li 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 npaum li cas ntawm cov iav fiber ntau. Txij li cov ntaub iav fiber ntau ua raws li lub cev pob txha, PTFE raug txwv thaum lub sij hawm shrinkage, ua kom muaj zog hauv tensile thermal stress. Thaum qhov kev ntxhov siab no dhau lub zog tensile ntawm PTFE zaj duab xis los yog lub zog sib txuas ntawm PTFE thiab iav fiber ntau, kev 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 sai ntawm cov kuab tshuaj thiab cov khoom 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 uneven 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 pob thiab tsuas yog tsim ib tug superficial ' daim tawv nqaij zaj duab xis '. Cov yeeb yaj kiab no muaj qhov tsis muaj zog anchoring nrog lub substrate thiab nyhav rau 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 gas uas ruptures lub txheej los yog tsis muaj zog cov kev sib raug zoo ntawm PTFE thiab iav fiber, uas 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 tuab satin) 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 bets rau bonding machines, single-sided PTFE cloth, high-temperature resistant conveyor bets, high-temperature mesh belt:

·  Service Hotline: Mr. Guo: +86 18944819998 Mr. Liu: +86 13705266308

Peb ib txwm txhawb nqa lub tswv yim kev pabcuam ntawm tus nqi tsim nyog, kev tshaj lij thiab kev ncaj ncees, thiab tau mob siab rau muab kev daws teeb meem thiab kev pabcuam rau koj!