1.Application scope .
(1). Wɔde di dwuma wɔ rɔba a ɛnyɛ den so: te sɛ NR, BR, NBR, IR, SBR, ne nea ɛkeka ho.
(2). Fa gu rɔba a ɛyɛ saturated so: te sɛ EPM betumi ayɛ vulcanized denam peroxide nkutoo so, EPDM betumi ayɛ vulcanized denam peroxide ne sulfur nyinaa so.
(3). Wɔde di dwuma wɔ nkɔnsɔnkɔnsɔn rɔba ahorow mu: te sɛ q vulcanization.
2. Peroxide vulcanization nhyehyɛe no su ahorow .
(1). Vulcanized rɔba no ntam nkitahodi nhyehyɛe yɛ CC nkitahodi, a ɛwɔ ahoɔden a ɛkɔ soro, nnuru a ɛkɔ soro a ɛma ɛyɛ den, ne ɔhyew ne oxygen onyin a ɛyɛ papa a ɛko tia.
(2). Vulcanized rɔba wɔ daa daa deformation, elasticity pa ne dynamic adwumayɛ a enye.
(3). Ahobanbɔ a ɛnyɛ papa ne peroxide a ne bo yɛ den.
(4). Wɔ static sealing anaasɛ high temperature static sealing products no wɔ dwumadie ahodoɔ pii.
3.Commonly de peroxides a wɔde di dwuma no di dwuma .
Nneɛma a wɔtaa de di dwuma wɔ peroxide mu ne alkyl peroxides, diacyl peroxides (dibenzoyl peroxide (BPO)) ne peroxy esters. Wɔn mu no, wɔde dialkyl peroxides di dwuma kɛse. Te sɛ: Diisopropyl peroxide (DCP): Mprempren ɛyɛ ade a wɔde di dwuma kɛse wɔ vulcanizing mu.
2,5-dimethyl-2,5-(di-tert-butylperoxy) Hexane: Wɔsan frɛ no bis-dipentyl .
4. Peroxide vulcanization afiri .
Ɛnyɛ den sɛ peroxide kuw a ɛyɛ peroxide no bɛporɔw wɔ ɔhyew mu ma ayɛ free radicals, na ɛno kanyan free radical type cross-linking reaction a ɛwɔ rɔba molecule nkɔnsɔnkɔnsɔn mu no.
5. Nneɛma atitiriw a ɛwɔ peroxide vulcanization mu:
(1). Dosage: Ɛsono sɛnea ɛsono rɔba ahorow .
Cross-linking efficiency of peroxide: 1g molecule of organic peroxide betumi ama rɔba molecule gram dodow a ɛma chemical cross-linking.Sɛ 1 molecule of peroxide tumi yɛ 1g molecules a rɔba cross-linked, cross-linking efficiency yɛ 1.
S nhw so no: SBR cross-linking efficiency y 12.5; Cross-linking efficiency a ɛwɔ BR mu no yɛ 10.5; EPDM, NBR, NR, cross-linking efficiency yɛ 1; cross-linking efficiency a ɛwɔ IIR no yɛ 0.
(2). Active agent ne co-sulfurizing agent a wɔde di dwuma de ma cross-linking efficiency no tu mpɔn .
Dwuma a ZnO di ne sɛ ɛbɛma ɔhyew a ɛko tia ade a ɛbata ho no atu mpɔn, na ɛnyɛ activator no. Dwuma a stearic acid di ne sɛ ɛbɛma ZnO a ɛwɔ rɔba no mu no ayɛ mmerɛw na apete. HVA-2 (n,n’-phthalimido-dimaleimide) nso yɛ peroxide a ɛyɛ adwuma yiye.
Aduru aboafo a wɔde ka ho a wɔde ka ho: titiriw sulfur kɔkɔɔ, ne nneɛma afoforo a ɛboa ma ɛyɛ cross-linking te sɛ divinylbenzene, trialkyltricyanate, carboxylates a ɛnyɛ nea ɛyɛ mmerɛw, ne nea ɛkeka ho.
(3). Fa nneɛma kakraa bi a ɛyɛ alkaline, te sɛ MGO, triethanolamine, ne nea ɛkeka ho, ka ho, na ama cross-linking no atu mpɔn, kwati slot carbon black ne silica ne acidic fillers afoforo (acid a wɔde yɛ free radicals passivation); Nneɛma a ɛko tia ɔyare mmoawa no taa yɛ amine ne phenolic antioxidants, a ɛnyɛ den nso sɛ wɔbɛma free radicals passivation, a ɛtew cross-linking so no so tew, ɛsɛ sɛ wɔde di dwuma kakraa bi.
(4). Vulcanization Temperature: Ɛsɛ sɛ ɛkorɔn sen ɔhyew a ɛwɔ peroxide a ɛporɔw mu .
(5). Vulcanization bere: mpɛn pii no 6~10 mpɛn a ɛyɛ peroxide fã nkwa.
Peroxide fã nkwa: wɔ ɔhyew pɔtee bi mu no, peroxide a ɛporɔw kɔ bere a ɛho hia mfiase no fã a na ɛwɔ hɔ no fã, a wɔda no adi wɔ T1/2 mu.
Sɛ DCP fã a ɛwɔ 170°C no yɛ 1min a, ɛnde ɛsɛ sɛ ne sulphation bere a ɛyɛ papa no yɛ 6~10min.
Nneɛma a wɔde yɛ nhwehwɛmu: EPDM 100 (Base) .
S 0.2 (aduru a ɛma obi ho yɛ fɛ) .
SA 0.5 (Adwumayɛbea) .
ZnO 5.0 (sɛnea ɛbɛyɛ a ɔhyew a ɛko tia no bɛma atu mpɔn) .
HAF 50 (aduru a ɛhyɛ den) .
DCP 3.0 (Thoxotropic aduru) .
MGO 2.0 (ɛma cross-linking efficiency tu mpɔn) .
ngo a wɔde yɛ adwuma 10 (aduru a ɛyɛ mmerɛw) .
