Yuav ua li cas hauv cov txheej txheem sintering ntawm PTFE cov khoom

Cov txheej txheem sintering ntawm cov khoom PTFE yog cov txheej txheem lub cev. Lub pob zeb tsis tseem ceeb polytetrafluoroethylene macromolecule yog sib xyaw ntawm thaj av crystalline thiab amorphous thaj av. Thaum twg qhov kub tau mus txog 327 Crystal, Thaj chaw Crystal pib ploj thiab hloov mus rau hauv amorphous colloidal xeev. Loj cov saw hlau pib sib kis, thiab tseem muaj cov txheej txheem ua kom cov leeg to ib leeg hloov. Qhov zoo dua qhov siab sintering ntawm cov khoom PTFE tuaj yeem ua rau cov txheej txheem diffusion ntawm cov xov tooj molecular mus tau nrawm. Molecular saw ntawm lub zog tshwm sim sau lub qhov hws sab laug los ntawm kev kub ntxhov ntawm cov khoom sib ntxiv, tshem tawm cov kev ntxhov siab sab hauv los ntawm cov kab ntsig ntawm fibrosis thiab lwm yam thaum lub sijhawm thawb cov txheej txheem ntawm cov cob hais, thiab ua rau cov roj hmab sib xyaw ploj, macromolecules zoo sib txuas ua ke, thiab kub ntawm polytetrafluoroethylene cov khoom lag luam kom tsim nyog, uas yog qhov muaj txiaj ntsig rau cov txheej txheem tsis sib haum, tab sis vim yog qhov tsis zoo thermal conductivity ntawm polytetrafluoroethylene. Nws yog ib qho yooj yim los tsim qhov ntsuas kub kub hauv qhov txheej insulating, qhov ntawd yuav tsum tau hais, yog tias qhov kub tsis dhau thiab qhov siab sintering tsis tsim nyog, qhov ntsuas lub ntsej muag yuav decomposed.

1. Polytetrafluoroethylene yog tsim los ntawm Dawb Radical Polymerization ntawm tetrafluoroethylene. Cov tshuaj tiv thaiv kev lag luam polymerization tau nrawm nyob rau ntawm qhov muaj ntau ntawm cov dej kom tawg cov cua sov ntawm cov tshuaj tiv thaiv thiab pab tswj kev kub. Lub polymerization feem ntau yog 40 ~ 80 ℃, nyob rau hauv lub siab ntawm 3 ~ 26kg / cm 2, inorganic persulfate thiab organic peroxide tuaj yeem siv los ua tus pib ua, lossis redox kev pib siv tau.

2. Nco ntsoov tias qhov ntsuas cua kub yuav tsum tsis pub tshaj 400 ℃, thiab lub chaw kuaj yuav tsum muaj qhov cua zoo, uas yog cov txiaj ntsig tshem tawm cov pa roj lom. PTFE extrusion molding txheej txheem, extrusion molding yog ntxiv cov PTFE cob rau cov khoom lag luam ntawm lub tshuab extruder, extrusion inlet pwm ua rau nws tsim cov kav dej ntom ntom, bar thiab lwm yam khoom, thiab tom qab ntawd los ntawm sintering thiab txias kom ua khoom nrog qee yam tshwj xeeb. Cov yam ntxwv ntawm extrusion molding yog tias nws tuaj yeem tsim txuas ntxiv, nws yog txuas ntxiv ntawm kev ua molding.

3.PTFE isobaric moulding muaj cov yam ntxwv ntawm cov khoom siv yooj yim, kev tsim khoom sai, cov pwm yooj yim qauv thiab kev lag luam yooj yim, kev sib txawv ceev ntawm cov khoom, cov khoom zoo, txuag cob thiab lwm yam. PTFE compression molding thiab compression molding yog feem ntau siv cov txheej txheem ntawm PTFE. Qee cov khoom lag luam nrog cov duab yooj yim xws li daim hlau, pas nrig, lub tes tsho, zaj duab xis plooj, rov qab phaj, thiab lwm yam tuaj yeem ua pwm, cov qauv moulding feem ntau suav nrog plaub theem kev sib xyaw, preforming, sintering thiab txias. Ntawd yog hais, Teflon yog tsim rau hauv tuab ntawm chav tsev kub.

4. Cov theem pib ntawm cov txheej txheem txheej txheem ntawm kev rho tawm polymerization PTFE suav nrog preforming, sintering thiab txias. Preforming yog los nias cov hmoov PTFE cob rau hauv cov khoom lag luam uas tau xaiv nrog qee lub cev. Sintering yog los ua kom sov cov khoom lag luam uas tau muab tso ua ntej rau qhov chaw ntawm lub cob yog li cov cob cov tuab tau ntwm rau hauv homogeneous qauv; Kev txias yog qhov txias kom txias ntawm qee qhov ua kom txias kom tau txais cov khoom siv polytetrafluoroethylene nrog rau qee yam duab.