There are about 100-200 kinds of rubber products in each vehicle, including 200-500 rubber accessories. The automotive rubber products other than tires account for about 6% of the total cost of the vehicle, mainly including four categories: tape, hose, shock absorption products and sealing products, which solve the problems of sealing, shock absorption, protection and transmission of key parts of the vehicle. The rubber used for automotive rubber products includes natural rubber, styrene butadiene rubber, cis-1,4-polybutadiene rubber, butyl rubber, nitrile rubber, etc. the appropriate amount of recycled rubber can effectively reduce the cost of raw materials.
1. design points for vulcanization system of rubber materials for automobile production with a large amount of recycled rubber
When the reclaimed rubber and a variety of synthetic rubber are used to prepare rubber materials for automobiles, sulfur accelerator system is often used, and the physical and mechanical properties of vulcanizates are better. With the increase of the amount of recycled rubber, the amount of sulfur in the formula should be appropriately increased: This is because the recycled rubber contains more free sulfur and low molecular substances, which will consume some sulfur; The crosslinking density of reclaimed rubber is low, and more sulfur yellow is needed to form sufficient crosslinking bonds.
When styrene butadiene rubber/nitrile butadiene rubber/cis-1,4-polybutadiene rubber/reclaimed rubber are used to prepare automotive rubber materials, polyether amine accelerator or thiazole accelerator can be used with sulfur to improve the curing efficiency and reduce the risk of scorch. Polyether amine accelerator has the advantages of fast curing speed, high curing efficiency and long curing flat period. When used with a small amount of thiazole accelerator or sulfosamide accelerator, it can improve the curing speed and the aging resistance and fatigue performance of automotive rubber materials.
2. design points of reinforcement and filling system for rubber materials used in automobile production with a large amount of recycled rubber
High wear-resistant carbon black is the most commonly used reinforcing agent in automotive rubber materials, such as carbon black N220 and N330. It has good reinforcing effect and low heat generation, which can effectively improve the mechanical properties and wear resistance of rubber materials; Use carbon black N550 when necessary to improve the fluidity of rubber, especially to produce sealing products with complex cross-section; When synthetic rubber/reclaimed rubber is used to prepare shock absorbing rubber products for vehicles, an appropriate amount of light calcium carbonate or clay can also be filled.
3. design points for softening system of rubber materials for automobile production with a large amount of recycled rubber
When the reclaimed rubber was mixed with styrene butadiene rubber, nitrile rubber and cis-1,4-polybutadiene rubber to prepare rubber materials for automobiles, the processing properties of the rubber materials could be improved by reasonably selecting softeners. Pine tar is a general rubber softening plasticizer e5lyy55, which can promote the dispersion of the compounding agent, increase the viscosity of the rubber and improve the cold resistance of rubber products. It also has the effect of delaying vulcanization and preventing scorch at low temperature, and has the activation effect on thiazole accelerators. Engine oil is a lubricating plasticizer with good operation performance, especially suitable for rubber containing cis-1,4-polybutadiene rubber.
It should be noted that too much oil will spray out of the rubber surface and affect the adhesion.
4. reference formula for preparing rubber materials for automobiles by blending styrene butadiene rubber/nitrile butadiene rubber/cis-1,4-polybutadiene rubber/recycled rubber
30 phr styrene butadiene rubber, 15 phr nitrile rubber, 5 phr butadiene rubber, 50 phr reclaimed rubber, 2 phr zinc oxide, 1 phr stearic acid, 1 phr diphenylamine, 20 phr high wear-resistant carbon black, 15 phr engine oil, 15 phr pine tar, 2.8 phr polyether amine accelerator, 2 phr sulfur; 158.8 copies in total.
The use of reclaimed rubber, styrene butadiene rubber, cis-1,4-polybutadiene rubber and nitrile rubber can effectively reduce the cost of raw materials; With reasonable formulation, the finished rubber compound has good wear resistance, heat resistance and oxygen resistance, and is widely used in automotive rubber products.
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