Cov tswv yim zoo thiab cov txheej txheem rau ncua sij hawm Scorch Safety ntawm Roj Hmab Seals
Thaum lub sij hawm tsim cov roj hmab ntsaws ruaj ruaj, lub sij hawm scorch kev nyab xeeb yog ib qho tseem ceeb qhia rau kev ntsuam xyuas cov txheej txheem ntawm cov roj hmab tebchaw nyob rau hauv siab kub. Lub sij hawm muaj kev nyab xeeb luv luv heev yuav ua rau muaj kev sib tsoo ntxov ntxov - txuas ntawm cov khoom ua ntej vulcanisation pib, ua rau cov khoom seem thiab txo qis kev tsim khoom. Txhawm rau kom ua tiav cov khoom sib khi zoo, kev tswj hwm kev nyab xeeb lub sijhawm yog qhov tseem ceeb los tswj kev ua haujlwm txuas ntxiv rau qhov sib xyaw thiab tiv thaiv kev kho ntxov ntxov. Tsab ntawv xov xwm no qhia txog yuav ua li cas txuas ntxiv lub sijhawm kev nyab xeeb rau cov roj hmab foob los ntawm kev hloov kho, xaiv cov khoom siv, thiab kev ua kom zoo dua.
Txhais ntawm Scorch Safety Time
Scorch lub sij hawm kev nyab xeeb yog hais txog lub sijhawm ntev tshaj plaws ntawm qhov kub thiab txias thaum lub sij hawm uas cov roj hmab foob tseem tsis pub hla -kev sib txuas (vulcanization) cov tshuaj tiv thaiv. Yog tias lub sijhawm no ua pov thawj tsis txaus, qhov sib xyaw ua ke tuaj yeem pib vulcanisation ntxov ntxov thaum ua tiav, ua rau tsis muaj -cov khoom ua raws lossis xav tau cov khoom pov tseg. Yog li ntawd, ncua sij hawm kev nyab xeeb scorch ho txhim kho kev tsim khoom thiab txo cov nqi seem.
Qhov Tseem Ceeb Tseem Ceeb cuam tshuam rau Scorch Safety Time
1. Kev xaiv ntawm Rubber Base Compound
Cov roj hmab hauv paus compound ua ib qho tseem ceeb cuam tshuam rau lub sijhawm kev nyab xeeb. Cov khoom sib txawv ntawm cov roj hmab sib txawv ua rau muaj kev sib txawv ntawm lub sijhawm rau kev nyab xeeb; xaiv cov khoom siv roj hmab tsim nyog tsim lub hauv paus rau kev ncua sij hawm no.
Styrene-Butadiene Roj Hmab (SBR): SBR-raws li cov roj hmab tebchaw feem ntau ua rau pom kev tiv thaiv ntau dua rau scorch piv rau cov roj hmab ntuj (NR)-raws li formulations. SBR muaj kev tiv thaiv zoo tshaj scorch thiab yog qhov zoo - haum rau cov khoom siv roj hmab uas yuav tsum tau siv sij hawm ntev scorch.
Nitrile roj hmab (NBR): Thaum cov formulations yuav tsum tau ncua scorch kev nyab xeeb lub sij hawm, NBR nrog tsawg acrylonitrile (ACN) cov ntsiab lus los yog tsawg viscosity yuav raug xaiv. Xws li NBR nthuav tawm zoo tshaj scorch tsis kam nyob rau hauv cov xwm txheej zoo ib yam.
Cov roj hmab ntuj (NR): Kev sib xyaw cov roj hmab ntuj nrog polybutadiene roj hmab (BR) feem ntau txuas rau lub sijhawm muaj kev nyab xeeb ntawm qhov sib xyaw. Kev koom ua ke ntawm polybutadiene txhim kho cov roj hmab ntuj tiv thaiv scorch.
Cov pa roj carbon dub: Siv qis- cov qauv carbon dub (qhov loj dua qhov me me) ua rau cov roj hmab lub sij hawm muaj kev nyab xeeb. Finer-grained carbon dub txo cov cua sov thaum lub sij hawm ua, yog li ncua sij hawm kev nyab xeeb scorch.
2. Kev xaiv cov khoom siv ntxiv thiab cov khoom ntim
Tshaj li cov khoom siv hauv paus, kev xaiv cov fillers thiab additives kuj tseem cuam tshuam rau lub sijhawm kev nyab xeeb.
Silica: Ua haujlwm precipitated silica nrog rau qhov chaw siab tshwj xeeb tuaj yeem txuas ntxiv lub sijhawm kev nyab xeeb ntawm cov qauv roj hmab. Txawm li cas los xij, kev siv silica tuaj yeem ua rau cov nqi vulcanisation qeeb, yuav tsum tau ua tib zoo ntsuas kev nyab xeeb ntawm scorch thiab vulcanisation efficiency.
Zinc Oxide: Kev sib koom ua ke ntawm zinc oxide nyob rau hauv uas tsis yog -halogenated roj hmab formulations txhim kho scorch kev nyab xeeb. Cov zinc oxide ntau dhau yuav ua rau ntau tshaj -vulcanisation, yuav tsum tau tswj kev noj tshuaj nruj heev.
Antioxidants: Incorporating antioxidants xws li PPD (para-phenylenediamine antioxidants) zoo txhim khu cov roj hmab scorch.
Cov neeg ua hauj lwm no inhibit scorch phenomena tshwm sim los ntawm thermal oxidation cov tshuaj tiv thaiv thaum ua. Txawm li cas los xij, kev siv ntau cov tshuaj antioxidants tuaj yeem cuam tshuam rau cov roj hmab lub cev lub cev.
3. Optimization ntawm Vulcanisation System
Lub tshuab vulcanisation muaj xws li cov roj hmab cov vulcanising cov neeg ua haujlwm thiab cov accelerators, uas ncaj qha cuam tshuam rau lub sijhawm kev nyab xeeb.
Sulphenamide Accelerators: Sulphenamide accelerators raug suav hais tias yog qhov tsim nyog tshaj plaws vulcanisation system txhawm rau txhim kho kev nyab xeeb. Lawv muab kev nyab xeeb zoo heev thaum ua kom muaj kev ua haujlwm siab vulcanisation thiab tiv thaiv tus ntoo khaub lig ntxov ntxov - txuas.
Peroxide Vulcanisation: Thaum siv peroxides rau vulcanisation, xaiv cov peroxide sib txawv muaj feem cuam tshuam rau lub sijhawm kev nyab xeeb. Piv txwv li, siv BBPIB (ntawm qhov tsis tshua muaj siab) ntau dua li DCP (dicyandimethyl peroxide) yields ncua sij hawm kev nyab xeeb.
Retarders thiab Inhibitors: Retarders xws li salicylic acid thiab benzoic acid ua haujlwm qeeb cov tshuaj tiv thaiv scorch, muab kev sib xyaw ua haujlwm ntau lub sijhawm. Tsis tas li ntawd, inhibitors zoo li cyclohexyl thiothiazine pab tswj kev tswj hwm lub sijhawm muaj kev nyab xeeb.
4. Cov txheej txheem hloov kho: Kub thiab kev sib xyaw ua ke
Tshaj li kev tsim tawm, kev hloov kho cov txheej txheem tsim khoom yog lwm txoj hauv kev zoo los txuas ntxiv lub sijhawm kev nyab xeeb.
Txo qhov kub ntawm qhov sib xyaw ua ke: txo qis qhov sib xyaw ua ke kom txo tau cov keeb kwm thermal hauv cov khoom siv roj hmab, ua kom ntev ntev kev nyab xeeb. Qhov kub ntau dhau thaum lub sij hawm sib xyaw ua ke nrawm hla - txuas cov kev cuam tshuam, ua rau lub qhov rai no luv.
Txhim kho Post-Kev Sib xyaw Txias: Cov ntawv txias tam sim- sib xyaw kom tswj tau qhov kub thiab txias yog lwm txoj hauv kev tseem ceeb rau kev ncua sij hawm kev nyab xeeb. Kev ua kom txias kom ntseeg tau tias qhov sib xyaw ua kom muaj peev xwm ua haujlwm txaus ua ntej nkag mus rau cov txheej txheem vulcanization.
5. Lwm yam cuam tshuam
Moisture contamination: Dej ingress hauv cov roj hmab sib txuas tuaj yeem ua rau hydrolysis ntawm vulcanisation system, txo cov sij hawm muaj kev nyab xeeb. Yog li ntawd, tag nrho cov ntaub ntawv raw yuav tsum tau khaws cia kom qhuav kom tsis txhob ya raws los ntawm kev nkag mus rau hauv lub formulation.
Kev siv cov tshuaj tua kab mob nrawm nrawm: Tsis txhob siv cov tshuaj tua kab mob nrawm, vim tias cov no yuav ua rau muaj teeb meem kub hnyiab hauv cov roj hmab. Yog li ntawd, kev siv cov khoom siv tshiab, khaws cia kom zoo yog qhov tseem ceeb ua ntej kom ntseeg tau tias muaj kev nyab xeeb kub hnyiab.
6. Lwm txoj kev daws teeb meem
Peroxide Vulcanisation: Thaum ua hauj lwm peroxide vulcanisation, xav txog kev siv peroxides nrog superior thermal stability kom ua tiav lub sij hawm ntev kev nyab xeeb. Piv txwv li, DMBPH peroxide pom zoo thermal stability dua DCP.
Co-Kev xaiv crosslinker: Xaiv cov co-crosslinkers uas tsim nyog, xws li 1,2-polybutadiene resin, tuaj yeem txhim kho kev nyab xeeb ntawm scorch. Cov sib txawv co-crosslinkers ua rau muaj kev cuam tshuam loj rau lub sijhawm scorch; lawv cov kev xaiv yuav tsum suav rau lawv qhov kev cuam tshuam rau cov khoom siv roj hmab.