Dab tsi yog qhov xwm txheej uas cuam tshuam rau kev ywj pheej ntawm cov roj hmab ntsaws ruaj ruaj?
Fillers thiab Ntxiv rau Roj Hmab Ntsig
Cov hom thiab cov ntsiab lus ntawm kev muab tub lim
Cov fillers sib txawv feem ntau ntxiv rauRoj Hmab FoobCov ntaub ntawv los txhim kho lawv cov cuab yeej siv cov khoom siv, kev tiv thaiv kub, thiab lwm yam, tab sis cov fillers no tseem tuaj yeem cuam tshuam elasticity.
Carbon Dub: Carbon Dub yog ib qho ntawm cov neeg siv roj hmab feem ntau, tab sis kev ua kom muaj cov roj hmab ntsaws, tab sis ntau dua cov roj hmab kom tsawg dua. Lub particle loj thiab dispersibility ntawm carbon dub yog tseem tseem ceeb heev cuam tshuam rau kev elasticity roj hmab. Cov tshuaj ntsuab zoo thiab cov pa roj hmab dub tuaj yeem txhim kho cov roj hmab tau zoo dua ntawm cov roj hmab ntxiv ntawm cov molecular charont, uas nyob rau hauv lem yuav cuam tshuam rau cov elasticity.
Silicone: Raws li lwm txoj kev muab rau carbon dub, silica feem ntau muab cov tshuaj txhuam hniav qis dua thiab txhim kho ua tsis taus ntawm cov roj hmab nrog tsawg dua kev cuam tshuam rau elasticity.
Roj thiab cov muag muag
Roj thiab cov muag muag feem ntau siv cov tshuaj ntxiv los txhim kho cov txheej txheem thiab txo qhov tawv ntawm cov roj hmab ntsaws ruaj ruaj. Lawv tuaj yeem txo cov coefficient ntawm kev txhuam ntawm roj hmab thiab nce nws cov kua dej thaum ua, tab sis lawv tuaj yeem cuam tshuam elasticity rau qee yam.
Softeners: Qhov tseeb ntawm cov muag khoom tuaj yeem ua rau cov khoom siv roj hmab, tab sis cov neeg tsiv teb chaws tuaj yeem ua rau cov neeg muag khoom me me, thiab cov neeg tsiv teb tsaws chaw tuaj yeem ua rau embrittlement roj hmab.
Ua kom tau zoo
Qee cov neeg sawv cev thov (piv txwv li, cov iav polymer, thiab lwm yam) tuaj yeem txhim kho cov roj hmab ntsaws, tab sis lawv tuaj yeem ua rau muaj kev txo qis hauv elasticity. Qhov no yog vim qhov sib ntxiv ntawm ib qho qauv txhawb nqa cov qauv molecular sab hauv cov roj hmab thiab tej zaum yuav txwv txoj kev hloov dawb ntawm cov saw polymer.
Tus txheej txheem vulcanization ntawm roj hmab
Tus txheej txheem vulcanization muaj kev txiav txim siab cuam tshuam rau ntawm cov roj hmab. Hauv cov txheej txheem volcanization, cov molecular chains ntawm cov roj hmab yog hla los ntawm kev ua ntawm vulcanizing cov khoom siv ntawm cov khoom siv ntawm cov khoom.
Vulcanization kub thiab sijhawm
Vulcanization kub thiab sijhawm yog qhov tseem ceeb uas cuam tshuam rau qib ntawm kev kho (crosslinking) ntawm roj hmab thiab qhov kawg elasticity. Dhau ib tug vulcanization kub los yog ntev ntev lub sij hawm vulcanization tuaj yeem ua rau cov roj hmab hla, uas txo cov elasticity, uas txo tau elasticity thiab cov khoom tuaj yeem ua nyuaj thiab nkig.
Tsawg vulcanization: Roj hmab nrog tsis tiav volcanization muaj elasticity zoo, tab sis tsis zoo cov khoom siv.
Siab vulcanization: ntau heev vertancials yuav ua rau stiffer roj hmab thiab tsis zoo elasticity, tab sis kub tsis kam thiab ruaj yuav nce ntxiv.
Xaiv cov neeg sawv cev ntawm vulcanizing
Hom thiab tus nqi ntawm vulcanizing tus neeg sawv cev muaj qhov cuam tshuam ncaj qha rau cov roj hmab ntawm roj hmab. Cov neeg sawv cev uas siv tau yog cov peroxides thiab leej faj. Sulphur vulcanization feem ntau muab cov elasticity, thaum Peroxide vulcanization tuaj yeem ua rau muaj kev tawv ntau dua thiab kub tsis kam.
Environmentalency
Qho so
Elasticity ntawm roj hmab yog ze ze rau qhov kub hloov. Qhov kub kub uas siab dhau los yog qis dua tuaj yeem cuam tshuam rau kev ywj pheej ntawm cov roj hmab.
Kev kub siab: kub siab tuaj yeem cuam tshuam rau kev txav ntawm cov roj hmab molecular chains, uas tej zaum yuav ua rau muaj kev txo qis hauv cov khoom, thiab txawm softening thiab rhelology.
Tsis tshua muaj kub: tsawg kub tuaj yeem ua kom cov roj hmab ntau dua thiab txo cov kev ywj pheej ntawm cov molecular chains, uas ua rau muaj kev txo qis hauv elasticity.
Vaum Thiab Cov Oxygen
Ya dej noo thiab cov pa kuj tseem cuam tshuam rau cov roj hmab. Qee cov rubbers (piv txwv li, epdm, epdm, thiab lwm yam) unlough noo noo lossis noo ib puag ncig, ua rau kev hloov pauv hauv lawv lub cev. Lub sijhawm ntev ntawm cov pa kuj tseem ua kom nrawm txheej txheej ntawm roj hmab thiab txo nws cov elasticity.
Ultraviolet rays thiab ozone
Ultraviolet lub teeb thiab ozone muaj qhov cuam tshuam tshwj xeeb rau roj hmab. Ntev nthuav dav ntawm roj hmab mus rau ultraviolet lub teeb thiab ozone tuaj yeem ua rau cov tshuaj molecular tuaj yeem ua rau cov roj hmab uas tsis yooj yim, uas tuaj yeem txo cov roj hmab.
Kev ntxhov siab thiab qaug zog
Cov roj hmab ntsaws ruaj ruaj yog cov kev ncab ntau ncab thiab cov compressions ntev tshaj kev siv. Cov kev ntxhov siab thiab cov roj av ua rau cov roj hmab kom poob nws txoj kev elasticity lossis txawm tias ua kom deform todly. Yog li, cov tshuab roj hmab yuav tsum yog tsim nrog qaug zog lub neej thiab rov qab muaj peev xwm hauv lub siab ntev siv.
Txhawm rau kom suav cov khoom siv roj hmab cuam tshuam nrog cov roj hmab ntsaws ruaj ruaj ntawm cov roj hmab nws tus kheej, cov txheej txheem kev siv tshuaj, ib puag ncig, thiab lwm yam. Elasticity ntawm roj hmab yog embodiment ntawm nws cov khoom siv, thiab nws yog tus yuam sij rau seb nws puas tuaj yeem qhia tau zoo heev hauv cov ntawv thov sib txawv. Txhawm rau ua kom zoo rau cov elasticity ntawm cov roj hmab ntsaws ruaj ruaj, nws yog ib qho tsim nyog yuav tsum tau txiav txim siab cov khoom siv raw rau kev tswj hwm kev siv thev naus laus zis rau kev yoog raws kev siv hluav taws xob.