Vim li cas sulfur siv rau vulcanization ntawm roj hmab?
Tso lus
Sulfur yog thawj cov tshuaj tshawb pom los ntawm Charles Goodyear rau vulcanize Natural roj hmab tebchaw.
Txog thaum lig 1950, tsuas yog sulfur tau siv los ua vulcanize roj hmab tebchaw.
Nws tsis muaj tseeb tias tsuas yog sulfur tuaj yeem siv rau vulcanization
Qhov tseeb, leej faj tuaj yeem tsuas yog vulcanise unsaturated rubbers (polymer saw muaj ob daim ntawv cog lus) xws li Natural roj hmab, Styrene Butadiene roj hmab, Nitrile Butadiene roj hmab, thiab lwm yam.
Thaum qee cov organic peroxide, Phenolic resin feem ntau tuaj yeem vulcanise tag nrho cov roj hmab (saturated thiab unsaturated).
Kuj tseem muaj lwm cov kev kho mob tshwj xeeb (vulcanising agents) zoo li ZnO / MgO uas yog siv los ua vulcanise Chloroprene roj hmab, Epichlorohydrin roj hmab.
Feem ntau ntawm cov roj hmab tebchaw nyob rau hauv ib hnub rau ib hnub kev ua ub no muaj Natural roj hmab, Styrene Butadiene roj hmab, Butyl roj hmab. Yog li ntawd, leej faj yog ntau heev thiab feem ntau paub rau txhua lub cev.
Dynamic zog yog zoo heev rau sulfur vulcanised tebchaw thaum piv rau lwm yam curatives xws li peroxide los yog resin kho. Qhov no yog vim li cas vim li cas sulfur vulcanisation yog siv nyob rau hauv tag nrho cov dynamic khoom xws li log tsheb, kis tau tus mob siv, thiab lwm yam.
Txawm hais tias muaj lwm cov vulcanising agents (curatives), leej faj dominates lub lag luam feem ntau vim nws txoj kev ntseeg siab, yooj thiab tswj ntawm vulcanisation sib nrug los ntawm nws cov khoom zoo heev dynamic.
Sulfur ib leeg tsis tuaj yeem siv rau vulcanization. Nws yuav tsum tau accelerators thiab activators. Accelerators yog cov organic chemical compound uas tuaj yeem ua kom nrawm lossis qeeb ntawm cov txheej txheem vulcanization. Feem ntau, ntxiv cov accelerators accelerates lub vulcanisation. Activators (ZnO / Stearic acid) kuj tseem ceeb heev rau cov txheej txheem Vulcanisation.
Yog tias koj nug kuv tias vim li cas tsuas yog sulfur thiab tsis phosphorus lossis lwm cov tshuaj inorganic tuaj yeem siv rau vulcanisation, ces qhov no yog ib lo lus nug tiag tiag tsis muaj leej twg paub cov lus teb. Txawm hais tias muaj ntau qhov kev xav los yog qhov yuav tshwm sim, tab sis tseem muaj tseeb yog vim li cas tsis to taub meej.
Nyob rau hauv rooj plaub, koj xav paub ntau ntxiv txog dab tsi / vim li cas / yuav ua li cas ntawm vulcanisation. Xav tias dawb nyeem hauv qab no.
Cia peb mus rau qhov pib ua ntej. Cia kuv yooj yim npaum li kuv ua tau.
Cia kuv qhia koj ua ntej no -
Roj hmab yog tsim los ntawm 1000s ntawm polymer chains entangled ua ke.
Tsuas yog xav pom - nws zoo li noodles hauv lub tais.
Tam sim no mus rau koj cov lus teb:
Vulcanization yog dab tsi?
Vulcanisation tsis muaj dab tsi tab sis cov txheej txheem ntawm kev siv cov cua sov los txuas rau cov saw hlau polymer.
Qee lub sij hawm cov txheej txheem vulcanisation kuj ua tiav nrog cov khoom tsim, nrog kev pab ntawm Compression molding, Txhaj tshuaj molding, thiab lwm yam.
Nws tuaj yeem xoob hu ua curing lossis nias.
Vim li cas vulcanization tseem ceeb.?
Roj Hmab yog cov khoom siv amorphous uas txhais tau hais tias muaj kev sib cuam tshuam tsawg heev ntawm cov saw hlau polymer (tsawg intermolecular attraction). Yog li feem ntau, txawm tias koj muab lub zog me me lossis txawm tias qhov hloov pauv me ntsis ntawm qhov kub thiab txias, cov saw hlau polymer no pib txav mus. Qhov ntawd txhais tau tias cov khoom ntws los yog deforms (mus tas li) vim tias tsis muaj kev txwv los ntawm cov molecules nyob ze ntawm cov saw hlau polymer (tsawg intermolecular attraction). Qhov no deformation los yog txaus muaj peev xwm kuj tsis thim rov qab. Qhov no txhais tau tias koj tsis muaj cov khoom ruaj khov.(Qhov no kuj yog vim li cas cov roj hmab ntws thaum lub caij ntuj sov thiab ua rau lub caij ntuj no nyuaj.)
Yog li txhawm rau txwv kev txav ntawm cov saw hlau polymer, cov saw hlau polymer no raug kho rau ib leeg / txuas rau ib leeg. Yog li cov txheej txheem ntawm kev kho lossis txuas ua ke ntawm cov saw hlau polymer hu ua Vulcanisation / crosslinking.
Yog li inshort, yog tias koj xav tau cov khoom siv ruaj khov, koj yuav tsum tau vulcanize lossis hauv cov lus yooj yim, koj yuav tsum tsim qhov sib txuas ntawm cov saw hlau polymer.
Tam sim no Vim li cas Sulfur siv ??
Txhawm rau tsim ib qho kev sib txuas, cov tshuaj / cov khoom yuav tsum tuav ob lossis ntau dua polymer chains.
Charles Good xyoo tau yuam kev pom leej faj muaj peev xwm hla cov saw hlau polymer. Yog li tam sim no, tsis muaj leej twg nkag siab tias vim li cas sulfur tsuas tuaj yeem ua qhov no thaum lwm cov ntaub ntawv xws li phosphorus lossis lwm yam khoom siv tsis muaj peev xwm ua tau.
Qhov sib txawv tseem ceeb ntawm kev siv Sulfur thiab lwm yam ntaub ntawv yog qhov ntawd
Sulfur muaj cov khoom muaj zog zoo heev thaum piv rau lwm cov curatives.Yog vim li cas vim li cas sulfur yog siv rau cov khoom zoo li cov log tsheb. Qhov tsis zoo ntawm sulfur yog tias nws tsis tuaj yeem tiv taus qhov kub thiab txias. Qhov ntawd yog qhov uas lwm cov tshuaj xws li peroxide, phenolic resin tuaj rau hauv kev ua si.
Tam sim no, cov lus nug yog vim li cas sulfur yog zoo rau dynamic zog?.
Zoo, nws yuav tsum tau ua nrog hom sulfur siv. Feem ntau, Elemental polymeric sulfur yog siv (SS6-S). Yog li sulfur nws tus kheej muaj cov saw hlau thiab yog li ntawm kev siv lub zog dynamic, lub zog tuaj yeem faib los yog hloov pauv los ntawm cov saw hlau sulfur.
