Hauv kev sib xyaw roj hmab, ntau qhov kev ntsuam xyuas tas li deformation yog ua tiav dua li kev ntsuas tensile mus tas li deformation. Raws li yuav tau tham hauv qab no, ntau yam ntawm cov khoom siv roj hmab cuam tshuam rau nws cov khoom deformation. Nws yuav tsum raug sau tseg ntawm no tias compressive mus tas li deformation thiab tensile mus tas li deformation yog ob yam khoom sib txawv. Yog li ntawd, dab tsi txhim kho compression mus tas li deformation tsis tas yuav txhim kho tensile mus tas li deformation, thiab vice versa. Tsis tas li ntawd, rau cov khoom siv roj hmab sealing, compressive mus tas li deformation tsis yog ib qho kev kwv yees zoo ntawm sealing siab lossis sealing kev ua tau zoo. Feem ntau, qhov nyuaj dua qhov kev sim ua kom muaj kev ntxhov siab ntxhov siab yuav tsum tau ua, qhov zoo dua qhov kev sib khi ntawm cov khoom yog kwv yees.
Cov txheej txheem kev sim hauv qab no yog siv los txhim kho qhov kev ua tau zoo ntawm cov roj hmab mus tas li. Nco tseg: Cov txheej txheem kev sim no yuav tsis siv tau rau txhua kis. Tsis tas li ntawd, txhua qhov sib txawv uas tuaj yeem txo qhov deformation mus tas li hauv compression lossis nro tuaj yeem cuam tshuam rau lwm yam khoom thiab yuav tsis raug hais hauv cov ntawv.
1. vulcanization system
Xav txog kev siv cov peroxides ua vulcanizing cov neeg ua haujlwm, uas tuaj yeem tsim cov CC cross-linked bonds thiab yog li txhim kho cov roj hmab mus tas li. Vulcanization ntawm ethylene propylene roj hmab nrog peroxide tuaj yeem txo cov compression mus tas li deformation ntawm cov roj hmab. Qhov zoo ntawm peroxide tshaj sulfur yog qhov yooj yim ntawm kev tuav cov peroxide thiab qis compressive mus tas li deformation ntawm roj hmab.
2. Vulcanization lub sij hawm thiab kub
Kev kub siab vulcanization thiab lub sij hawm ntev vulcanization tuaj yeem nce qib ntawm vulcanization thiab yog li txo cov compression txheej ntawm roj hmab.
3. Kev sib txuas ceev ceev
Ua kom cov crosslinking ceev ntawm cov roj hmab tuaj yeem txo qhov compression mus tas li deformation ntawm cov roj hmab.
4. Sulfur vulcanization system
Txhawm rau txo cov compressive mus tas li deformation ntawm EPDM compound thiab txhim kho cov cua sov, peb tuaj yeem xav txog qhov no 'low deformation' vulcanization system (mass): sulfur 0.5PHR, ZDBC 3PHR, ZMDC 3PHR, DTDM 2PHR, TMTD3PHR.
Hauv W hom neoprene, kev siv diphenylthiourea accelerator tuaj yeem ua rau cov roj hmab nrog qis compression mus tas li deformation, tab sis tsis txhob siv CTP los tiv thaiv coke, txawm hais tias nws tuaj yeem ua rau lub sijhawm kub hnyiab, tab sis nws muaj kev puas tsuaj ntau rau compression mus tas li deformation.
Rau NBR roj hmab, nyob rau hauv cov kev xaiv vulcanization system, tus naj npawb ntawm sulfur yuav tsum tau txo, sim siv leej faj los muab lub cev xws li TMTD los yog DTDM los hloov ib feem ntawm cov leej faj, tsawg leej faj cov ntsiab lus yuav txhim kho cov compression mus tas li deformation kev ua tau zoo ntawm cov roj hmab. Lub vulcanization system nrog HVA-2 thiab hyposulfuramide tuaj yeem ua rau cov roj hmab nrog qis compression mus tas li deformation.
5. peroxide vulcanization system
Kev xaiv ntawm BBPIB peroxide yuav muab cov roj hmab kom zoo dua qub deformation hauv compression. Nyob rau hauv peroxide vulcanization systems, kev siv cov co-crosslinkers tsub kom lub unsaturation nyob rau hauv lub system, uas nyob rau hauv lem ua rau ib tug high crosslink ceev, vim crosslinking dawb radicals nrog unsaturated bonds tshwm sim yooj yim dua li noj hydrogen los ntawm saturated chains. Kev siv cov co-crosslinkers hloov hom crosslinking network thiab yog li txhim kho cov compression mus tas li deformation zog ntawm cov nplaum.
6. post-vulcanization
Muaj vulcanization by-products thaum lub sij hawm vulcanization txheej txheem, thiab tom qab-vulcanization txheej txheem ntawm atmospheric siab tso cai rau cov by-products tso tawm, yog li muab cov roj hmab ib tug txo compression txheej.
7. Fluoroelastomer FKM/Bisphenol AF Vulcanization
Rau fluoroelastomers, kev siv bisphenol vulcanizing tus neeg sawv cev es tsis txhob peroxide vulcanizing tus neeg sawv cev tuaj yeem ua rau cov roj hmab qis dua qhov deformation hauv compression.
8. Cov nyhuv ntawm molecular hnyav
Hauv cov qauv roj hmab, kev xaiv roj hmab nrog qhov hnyav nruab nrab molecular hnyav tuaj yeem txo qhov compression mus tas li deformation ntawm roj hmab.
Rau NBR roj hmab, cov roj hmab uas muaj Mooney viscosity siab yuav tsum tau siv, uas tuaj yeem ua rau cov roj hmab nrog me me compression mus tas li deformation.
9. Neoprene
W hom neoprene muaj qis compression mus tas li deformation dua G hom neoprene.
10. EPDM
Txhawm rau ua kom cov roj hmab nrog qis compression mus tas li deformation, sim kom tsis txhob siv EPDM roj hmab nrog siab crystallinity.
11. NBR
NBR, uas yog emulsion polymerized nrog calcium chloride ua coagulant, feem ntau muaj cov compression tsawg.
Rau NBR roj hmab, yog tias koj xav ua kom pom tseeb ntawm nws cov compression mus tas li deformation kev ua tau zoo, ces sim xaiv ntau yam nrog cov ceg siab thiab cov saw siab entanglement lossis ntau yam nrog cov ntsiab lus acrylonitrile tsawg.
12. Ethylene-acrylate roj hmab
Rau AEM roj hmab, cov tshuaj peroxide vulcanizing tuaj yeem muab cov txheej txheem qis dua li cov tshuaj diamine vulcanizing.
13. Resin-raws li homogenizers
Tsis txhob siv cov resin-raws li homogenizers nyob rau hauv cov roj hmab tebchaw, vim qhov no ua rau kom lub compression txheej ntawm compound.
14. Fillers
Txo qhov txhaws, qauv thiab thaj chaw tshwj xeeb ntawm qhov muab tub lim (ua kom qhov loj me) feem ntau yuav txo cov txheej txheem compression. Nyob rau tib lub sijhawm, ua kom cov haujlwm ntawm qhov chaw muab tub lim tuaj yeem txhim kho qhov compression teeb tsis kam ntawm cov compound.
15. Silica
Tsawg silica muab tub lim nyob rau hauv lub compound yuav txo cov compression txheej. Txhawm rau kom muaj cov txheej txheem compression tsawg, nws yog ib qho tsim nyog yuav tsum tsis txhob muaj qhov ntim ntawm silica siab. Yog tias qhov ntim ntau dua 25 qhov chaw (los ntawm huab hwm coj), compressive mus tas li deformation ntawm cov compound ua loj.
16. Silane coupling tus neeg sawv cev
Xav txog kev siv silane coupling tus neeg sawv cev nyob rau hauv lub siab filling tus nqi ntawm precipitated silica, compression mus tas li deformation ntawm cov nplaum yuav txo tau. Silane coupling tus neeg saib xyuas tuaj yeem txo qhov compression mus tas li deformation ntawm silica puv roj hmab, thiab tseem txo cov compression tas li deformation ntawm silicate hom muab tub lim xws li av nplaum, talcum hmoov thiab lwm cov roj hmab puv.
17. Plasticizers
Txo qhov ntim ntawm cov yas yas hauv cov roj hmab feem ntau yuav txo cov compression mus tas li deformation ntawm cov roj hmab.
