1.Aplikeshɔn skɔp
(1). Dɛn kin yuz am pan rɔba we nɔ satεrayt: lɛk NR, BR, NBR, IR, SBR, ɛn ɔda wan dɛn.
(2). Aplay to satεrayt rכba: lεk EPM kin כnli vulkanayz bay pεrכksayd, EPDM kin vulkanayz bay כl tu pεrכksayd εn sכlfa.
(3). Dɛn kin aplay am to difrɛn chen rɔba: lɛk Q vulkanayzeshɔn.
2. Karakta dεm fכ di pεrכksayd vulkanayzεshכn sistεm
(1). di nεtwכk strכkchכ fכ di vulkanayz rכba na CC bond, wit hכy bond enεji, hכy kεmikכl stεbiliti, εn εksεlεnt rεsistεns to tεmכl εn כksijεn ol.
(2). Vulcanized rubber gɛt lɔw pɔrmanent difɔmeshɔn, gud ɛlastikiti ɛn po dinamik pefɔmɛns.
(3). Poor prosesin sefty en dia dia peroxide.
(4). Insay statik silin ɔ ay tɛmpracha statik silin prodak dɛn gɛt bɔku bɔku aplikeshɔn dɛn.
3.Pɛrɔksayd dɛn we dɛn kin yuz bɔku tɛm
di pεrכksayd vכlkεnayz ejen dεm we dεn kin yuz na alkil pεrכksayd, dayasil pεrכksayd (dibenzoyl pεrכksayd (BPO)) εn pεrכksi εsta. Pan dɛn wan ya, dɛn kin yuz dayalkil pɔroksayd bɔku bɔku wan. lεk: diisopropyl pεrכksayd (DCP): na di wan we dεn de yuz mכst naw fכ vulkanizing ejen.
2,5-dimethyl-2,5-(di-tert-butylperoxy) heksan: dɛn kin kɔl am bak bis-dipentil
4. Pεrכksayd vulkanayzεshכn mεkanism
di pεrכksayd grup fכ pεrכksayd kin izi fכ dכn bay כt fכ prodyuz fri radikal dεm, we de trigεr di fri radikal tכp kכros-linkin riakshכn fכ rכba mכlikul chen.
5. Ki poynt dεm fכ pεrכksayd vulkanayzεshכn:
(1). Di doz: i kin difrɛn wit difrɛn rɔba spɛshal dɛn
di kכros-link efyushכn fכ pεrכksayd: 1g mכlikul כrganik pεrכksayd kin mek כl di gram rכba mכlikul dεm de prodyuz kεmikכl kכros-link.If 1 mכlikul pεrכksayd kin mek 1g mכlikul fכ rכba kכros-link, di kכros-link efyushכn na 1.
Fɔ ɛgzampul: di krɔs-linkin efyushɔn fɔ SBR na 12.5; di kros-link efyushɔn fɔ BR na 10.5; di kros-link efyushכn fכ EPDM, NBR, NR na 1; di kros-link efyushכn fכ IIR na 0.
(2). Yuz aktiv ejen ɛn kɔ-sɔlfrayzin ɛjɛn fɔ impɔtant di krɔs-link efyushɔn
di rol we ZnO de ple na fכ impruv di hεt rεsistεns fכ di adhesive, nכto di aktibכt. di rol we stεarik asid de ple na fכ impruv di sכlubiliti εn dispershכn fכ ZnO insay di rכba. HVA-2 (N,N'-phthalimido-dimaleimide) na bak wan ifektiv aktibכt fכ pεrכksayd.
Ad ɔgzilari vulkanizing ejen: mɔ sɔlfɔ yɔlɔ, ɛn ɔda ɔksijɛn krɔs-link ejen dɛn lɛk divinylbenzene, trialkyltricyanate, unsaturated carboxylates, ɛn ɔda tin dɛn.
(3). Ad smɔl alkaline sɔbstans dɛm, lɛk MgO, triethanolamine, ɛn ɔda tin dɛm, fɔ mek di efyushɔn fɔ krɔs-link bɛtɛ, avɔyd fɔ yuz slot kabɔn blak ɛn silika ɛn ɔda asid fil dɛm (asid fɔ mek fri radikal dɛn pasivɛshɔn); antioksidant dεm na jεnarali amin εn fεnolik antioksidant dεm, we izi bak fכ mek fri radikal dεm pasivεshכn, we de ridyus di efyushכn fכ kכros-link, dεn fכ yuz dεm sכmtεm.
(4). Vulcanization temperechur: fכ hכy pas di dεkomposishכn tεmprachכ fכ pεrכksayd
(5). Vulcanization tεm: jεnarali 6~10 tεm fכ di haf-layf fכ pεrכksayd.
pεrכksayd haf-layf: na wan sכm tεmprachכ, di pεrכksayd dεkכmכshכn to af pan di כrijinal kכnsantreshכn fכ di tεm we i nid, we dεn εksprεs insay t1/2.
if di haf-layf fכ DCP na 170°C na 1min, den in positifu sכlfεshכn tεm fכ bi 6~10min.
Fɔmulashɔn ɛgzampul: EPDM 100 (bɛs) .
S 0.2 (ɔksijɛn vulkanayz ɛjɛn) .
SA 0.5 (aktivator) .
ZnO 5.0 (fɔ mek di ɔt rɛsistɛns bɛtɛ) .
HAF 50 (ejen we de riinfɔs) .
DCP 3.0 (Tiksotropik ejen) .
MgO 2.0 (Impruv kros-link efyushɔn)
Oil we de wok 10 (ejen we de mek pɔsin soft) .
