1. Taw qhia rauStyrene-Butadiene Roj Hmab (SBR)
1.1 Cov ntsiab lus thiab cov ntsiab lus tseem ceeb
Styrene-Butadiene Rubber (SBR) yog ib qho tseem ceeb hluavtaws roj hmab uas yog copolymerized los ntawm ob monomers, styrene thiab butadiene. Cov qauv tshuaj tuaj yeem sawv cev raws li hauv qab no:
[-CH2-CH(C6H5)-CH2-CH2-]n
Styrene monomer muaj SBR tshwj xeeb txhua yam zoo, tab sis butadiene monomer muab kev yooj yim thiab hnav tsis kam. SBR nrog cov yam ntxwv sib txawv tuaj yeem tsim los ntawm kev hloov pauv styrene-butadiene piv.
1.2 Cov txheej txheem tsim khoom thiab kev txhim kho keeb kwm
Styrene-Butadiene Roj Hmab yog thawj tsim thiab tsim los ntawm German cov kws tshawb fawb hauv xyoo 1929. Thaum Ntiaj Teb Tsov Rog II, Tebchaws Meskas tau pib tsim ntau yam SBR los ua kom tau raws li qhov xav tau ntawm cov log tsheb thiab lwm yam khoom siv roj hmab.
Tam sim no, SBR tsim thev naus laus zis tseem ceeb yog kev daws teeb meem polymerization thiab emulsion polymerization. Ntawm cov no, cov txheej txheem kev daws teeb meem polymerization muaj cov khoom lag luam ntau dua tab sis cov nqi tsim khoom ntau dua, thiab cov txheej txheem emulsion polymerization yog pheej yig dua thiab siv tau, txawm tias cov khoom ua tau zoo sib txawv me ntsis. Nyob rau hauv xyoo tas los no, raws li thev naus laus zis tau dhau los, cov txheej txheem tsim khoom ntawm styrene-butadiene roj hmab tau raug hloov kho tas li, raws li muaj kev tsim khoom thiab cov khoom zoo.
2. Cov yam ntxwv tseem ceeb ntawm styrene-butadiene roj hmab
2.1 Hnav tsis kam thiab kub tsis kam
Styrene-butadiene roj hmab muaj qhov tshwj xeeb hnav thiab kub ua haujlwm ua tsaug rau qhov muaj ntawm butadiene units. Butadiene units tuaj yeem tsim cov qauv sib txuas, ua kom cov roj hmab hnav tsis kam. Nyob rau tib lub sijhawm, styrene-butadiene roj hmab muaj qhov zoo thermal stability thiab yuav siv tau ntawm qhov kub thiab txias rau lub sijhawm ntev yam tsis muaj kev laus lossis kev ua haujlwm tsis zoo. Qhov no tso cai rau nws ua haujlwm zoo hauv cov ntawv thov uas xav tau hnav thiab tiv thaiv tshav kub, xws li cov log tsheb thiab cov hlua sib kis.
2.2 Zoo saj zawg zog thiab tsim kua muag kuj
Piv rau cov roj hmab ntuj, styrene-butadiene roj hmab yog hloov tau yooj yim dua thiab tsim kua muag resistant. Qhov no feem ntau yog vim qhov sib ntxiv ntawm cov styrene units, uas tuaj yeem ua rau kom muaj zog tensile thiab cuam tshuam ntawm roj hmab. Cov yam ntxwv no ua rau cov roj hmab styrene-butadiene txaus nyiam hauv cov khoom lag luam, kev sib khi hauv tsev, thiab lwm yam kev siv uas yuav tsum tau muaj zog heev.
2.3 Cov roj zoo heev thiab tshuaj lom neeg ua haujlwm
Styrene butadiene roj hmab yog heev resistant rau roj thiab tshuaj. Qhov no yog vim lub tsev styrene hydrophobicity, uas tso cai rau nws tiv taus yaig los ntawm cov roj sib txawv thiab cov kuab tshuaj. Qhov no feature ua rau nws nrov nyob rau hauv daim ntawv thov uas xav tau roj kuj, xws li cov yeeb nkab ntsaws ruaj ruaj thiab lub tsheb Cheebtsam.
2.4 Tus nqi qis
Styrene butadiene roj hmab tsis tshua kim dua li cov roj hmab ntuj vim pheej yig dua cov khoom siv raw thiab txoj kev tsim khoom yooj yim. Qhov no muab nws qhov sib txawv ntawm ntau daim ntawv thov raug nqi, suav nrog cov khoom siv hauv tsev thiab cov khoom lag luam yooj yim.
3. Daim ntawv thov thaj chaw ntawm styrene butadiene roj hmab
3.1 Roj hmab log
Styrene butadiene roj hmab yog siv dav hauv kev tsim cov log tsheb vim nws qhov hnav zoo dua, tiv thaiv tshav kub, thiab yoog raws. Nws yog feem ntau siv los ua cov khoom siv tseem ceeb rau cov log tsheb treads thiab sidewalls, muab cov log tsheb zoo dua hnav tsis kam thiab ua haujlwm ntev. Nws kuj tseem tsim nyog rau kev siv hauv lub log tsheb sab hauv liner thiab hlaws. Nyob rau tib lub sijhawm, styrene butadiene roj hmab tuaj yeem ua ke nrog lwm cov roj hmab sib xyaw ua kom lub log tsheb ua haujlwm tag nrho.
3.2 Cov khoom lag luam
Styrene butadiene roj hmab kuj feem ntau ua haujlwm hauv kev tsim cov khoom lag luam. Nws tuaj yeem siv los ua ntau yam kev sib tsoo tshuab, kev sib kis cov hlua, cov yeeb nkab ntsaws ruaj ruaj, thiab lwm yam, thiab nws muaj peev xwm tiv taus cov roj thiab tshuaj lom neeg. Nyob rau tib lub sijhawm, nws cov kua muag siab ua rau nws yog ib qho khoom siv zoo tshaj plaws rau kev lag luam hoses thiab kev poob siab. Styrene butadiene roj hmab kuj tseem siv tau rau kev tsim kho sealants, muaj nplaum nplaum, thiab lwm yam kev siv.
3.3 Cov khoom siv niaj hnub
Styrene butadiene roj hmab feem ntau yog siv rau ntau yam khoom siv roj hmab txhua hnub vim nws pheej yig tus nqi. Styrene butadiene roj hmab yog cov khoom siv yooj yim hauv ntau yam kev siv, nrog rau cov ntsaws ruaj ruaj, gaskets, thiab cov khoom ua si. Nws kuj tseem siv tau los tsim cov hnab looj tes, cov khoom ua si, thiab lwm yam khoom siv. Txawm hais tias nws yuav yog qhov tsis zoo rau cov roj hmab ntuj hauv qee qhov kev ntsuas kev ua tau zoo, nws qhov txiaj ntsig zoo rau nws tso cai rau nws kom muaj kev lag luam loj hauv kev ua lag luam txhua hnub.
4. Kev txhim kho yav tom ntej ntawm styrene butadiene roj hmab
4.1 Optimization ntawm cov qauv thiab kev tsim khoom
Raws li kev siv thev naus laus zis, cov qauv tsim thiab kev tsim qauv rau styrene butadiene roj hmab yuav ua kom zoo dua ntxiv. Ntawm qhov tod tes, los ntawm kev hloov pauv qhov sib piv ntawm styrene-butadiene, cov roj hmab styrene butadiene tuaj yeem tsim tau rau ntau yam kev siv. Kev txhim kho txuas ntxiv ntawm kev tsim khoom, xws li kev siv cov tshuaj polymerization thiab emulsion polymerization nyob rau hauv tandem, yuav, ntawm qhov tod tes, txhim kho cov zis efficiency thiab zoo. Tsis tas li ntawd, kev qhia txog kev tsim khoom siv thev naus laus zis xws li kev ua haujlwm tas mus li thiab kev siv tshuab ua haujlwm yuav ua rau txo nqi ntxiv.
4.2 Kev loj hlob ntawm high-kev ua tau zoo tshwj xeeb styrene-butadiene roj hmab
Nyob rau hauv lub neej yav tom ntej, raws li kev lag luam kev xav tau nce ntxiv, kev txhim kho cov khoom siv tshwj xeeb styrene-butadiene roj hmab yuav yog qhov tseem ceeb. Piv txwv li, los ntawm kev qhia cov monomers tshiab los yog siv cov cuab yeej hloov kho, styrene-butadiene roj hmab nrog kev ua tau zoo ntawm qhov kub thiab txias, kev ua haujlwm kub, lossis kev ua haujlwm yuav raug tsim los kom haum rau cov ntawv thov raws li qee qhov kev ua haujlwm nyuaj. Ib txhij, nyob rau hauv cov lus teb rau cov qauv mus rau lub teeb yuag thiab kev ua haujlwm siab, kev tshawb fawb thiab kev loj hlob yuav tsom mus rau kev tsim kom muaj zog thiab ntau dua hnav-resistant styrene-butadiene roj hmab.
4.3 Kev tiv thaiv ib puag ncig thiab kev siv cov khoom siv txuas ntxiv dua tshiab
Nrog rau tib neeg kev txhawj xeeb loj zuj zus rau kev tiv thaiv ib puag ncig, kev txhim kho cov roj hmab styrene-butadiene yuav ua qhov tseem ceeb rau kev tiv thaiv ib puag ncig thiab kev ruaj ntseg. Ntawm qhov tod tes, los ntawm kev txhim kho cov txheej txheem tsim khoom thiab txo cov peev txheej siv thiab cov pa phem emissions; ntawm qhov tod tes, los ntawm kev sim nrog bio-based monomers, cov roj hmab rov ua dua tshiab, thiab lwm yam khoom siv txuas ntxiv dua tshiab los tsim cov khoom siv roj hmab styrene-butadiene ntau dua. Qhov no yuav ua rau kom muaj txiaj ntsig ntawm styrene-butadiene roj hmab hauv kev tiv thaiv ib puag ncig ntsuab.