1.Xikalo xa xikombelo
(1). Yi cheriwa eka rhaba leyi nga tatiwangiki: ku fana na NR, BR, NBR, IR, SBR, na swin’wana.
(2). Tirhisa eka saturated rubber: kufana na EPM yinga vulcanized ntsena hi peroxide, EPDM yinga vulcanized hi peroxide na sulphur.
(3). Yi cheriwa eka rhaba yohambana hambana ya chain: kufana na Q vulcanization.
2. Swihlawulekisi swa sisiteme ya peroxide vulcanization
(1). Xivumbeko xa network ya rhaba leyi vulcanized i CC bond, leyingana energy yale henhla ya bond, kutshamiseka ka ti khemikhali tale henhla, xikan’we naku tiya swinene eka ku dyuhala ka mahiselo na oxygen.
(2). Vulcanized rubber yina deformation yale hansi ya nkarhi hinkwawo, elasticity ya kahle xikan’we na matirhelo ya kahle ya dynamic.
(3). Vuhlayiseki byo biha bya ku lulamisa na peroxide yo durha.
(4) . Eka static sealing kumbe high temperature static sealing switirhisiwa swina switirhisiwa swotala.
3.Ti peroxides leti tirhisiwaka ngopfu
Switirhisiwa leswi tirhisiwaka ngopfu swa peroxide vulcanizing i ti alkyl peroxides, diacyl peroxides (dibenzoyl peroxide (BPO)) na ti peroxy esters. Exikarhi ka tona, ti- dialkyl peroxide ti tirhisiwa ngopfu. Kufana na: diisopropyl peroxide (DCP): sweswi hi yona leyi tirhisiwaka ngopfu tani hi vulcanizing agent.
2,5-dimethyl-2,5-(di-tert-butylperoxy) hexane: yi tlhela yi tiviwa tanihi bis-dipentyl
4. Ndlela yo endla leswaku peroxide yi va vulcanization
Ntlawa wa peroxide wa peroxide wu bola hiku olova hi kuhisa kuva wu humesa ti free radicals, leswi hlohletelaka free radical type cross-linking reaction ya rubber molecular chain.
5. Tinhla ta nkoka ta peroxide vulcanization:
(1). Mpimo: wuhambana kuya hi tinxaka tohambana hambana ta rhaba
Cross-linking efficiency ya peroxide: 1g molecule ya organic peroxide yinga endla leswaku i tigiramu tingani ta ti molecules ta rhaba leti humesaka ti khemikhali cross-linking.Loko 1 molecule ya peroxide yinga endla 1g molecules ya rhaba yi cross-linked, cross-linking efficiency i 1.
Xikombiso: vukorhokeri bya cross-linking bya SBR i 12.5; vukorhokeri bya cross-linking bya BR i 10.5; ku tirha kahle ka ku hlanganisa ka EPDM, NBR, NR i 1; vukorhokeri bya cross-linking bya IIR i 0.
(2). Ku tirhisiwa ka active agent na co-sulfurizing agent ku antswisa vuswikoti bya cross-linking
Ntirho wa ZnO iku antswisa ku tiya ka kuhisa ka adhesive, kungari activator. Ntirho wa stearic acid i ku antswisa ku n’oka na ku hangalaka ka ZnO eka rhaba. HVA-2 (N,N’-phthalimido-dimaleimide) na yona i xitirhisiwa lexi tirhaka xa peroxide.
Ku engetela xiaki xa vulcanizing xo pfuneta: ngopfu ngopfu sulfur yellow, na swin’wana swo pfuneta swo hlanganisa cross-linking swofana na divinylbenzene, trialkyltricyanate, unsaturated carboxylates, na swin’wana.
(3). Engeta nhlayo yintsongo ya swilo swa alkaline, swofana na MgO, triethanolamine, na swin’wana, ku antswisa vukorhokeri bya cross-linking, papalata kutirhisiwa ka slot carbon black na silica na swin’wana swa acidic fillers (acid ku endla free radicals passivation); ti antioxidants hi xitalo i ti amine na phenolic antioxidants, na tona ta olova ku endla ti free radicals passivation, ku hunguta ku tirha kahle ka cross-linking, tifanele kutirhisiwa hiku olova.
(4) . Mahiselo ya vulcanization: yafanele kuva yale henhla kutlula mahiselo ya ku bola ka peroxide
(5) . Nkarhi wa vulcanization: hi xitalo 6~10 wa minkarhi ya hafu ya vutomi bya peroxide.
Hafu ya vutomi bya peroxide: eka mahiselo yokarhi, ku bola ka peroxide kuya eka hafu ya nhlayo yosungula ya nkarhi lowu lavekaka, leswi kombisiweke hi t1/2.
Loko hafu ya vutomi bya DCP eka 170°C yiri 1min, kutani nkarhi wa yona wa positive sulphation wufanele kuva 6~10min.
Xikombiso xa xivumbeko: EPDM 100 (xisekelo) .
S 0.2 (xitirhisiwa xo pfuneta xa vulcanizing) .
SA 0.5 (xitirhisiwa xa xitirhisiwa) .
ZnO 5.0 (ku antswisa ku tiya ka kuhisa) .
HAF 50 (xitirhisiwa xo tiyisisa) .
DCP 3.0 (Xiaki xa thixotropic) .
MgO 2.0 (Yi antswisa vukorhokeri bya cross-linking) .
Mafurha yo tirha 10 (xiaki xo olovisa) .
