1. Heat resistance
The thermal aging of rubber is a kind of oxidative aging caused by free radicals.For products requiring high heat resistance, choose diphenylamine and TMDQ and other heat resistant anti-aging agents.In addition, better heat resistance can be obtained by combining these free radical blockers with peroxide decomposition agents such as aging inhibitor MBI.
2. Flexural cracking resistance
Flexural cracking is the result of oxidative aging of the surface of the product caused by free radical reaction.In order to prevent this form of aging, the selection of amine or phenolic antiozonants (free radical inhibitors) plays a role.The effect of large surface mobility is excellent.
3. Ozone resistance
Antiozonants include p-phenylene diamines, TMDQ, sulfur veins and protective waxes, etc. Generally, the combination of the contaminated p-phenylene diamines with the non-contaminated sulfur veins and paraffin can achieve excellent results.However, the sulfur vein compounds have a significant tendency to accelerate scorch.In addition, ozone aging is produced on the surface of products, so the effect of anti-ozonation agents with large surface mobility is excellent.Recently, high molecular weight ozonants have been developed for their continued use.Copyright rubber information net
4. Resistance to harmful metal aging
Anti - harmful metal aging agents can be divided into metal ion sealing agents and metal surface inert agents.The former has excellent effects of p-phenylenediamines and bisphenol compounds, the latter has mercaptan compounds (such as anti-aging MB) and tricolata compounds.In order to obtain better resistance to harmful metal aging, the above-mentioned antiaging agents can be used together with heat-resistant antiaging agents.
5. Anti-light cracking and aging
Carbon black is an excellent ultraviolet absorber.Therefore, anti-aging agent for carbon black is not necessary, and for light products (carbon black is only used as a colorant) it is indispensable.For anti - aging with the general use of the first anti - aging agent and the second anti - aging agent.Among the antiaging agents, phenylenediamine antiaging agents have excellent anti-photoaging effect, but there is serious pollution.Among the non-polluting anti-aging agents, phenols, blocked amines and paraffin wax have excellent effects.In phenolic antioxidant, antiager DTBM P (2, 6 two tertiary butyl 4 methyl phenol) and stabilizer sP styrene (phenol) and stabilizer MBMTB [2, 2 '- methylene double (4 methyl 6 one tertiary butyl phenol)] and antiager MBETB [2, 2 gas methylene double (4 a ethyl, 6 tertiary butyl phenol)] the light crack resistance of effect is excellent.
6. Selection of paraffin wax
After vulcanization, paraffin wax is ejected on the surface of the product to form a physical protective film and effectively prevent ozone cracking of the product.The conditions in which paraffin is ejected on the surface of the product vary according to its composition, the type of rubber used (rubber and additives), and the temperature.Therefore, it is very important to choose paraffin wax that meets the conditions of use.