Natural rubber has good elasticity, high mechanical strength and excellent cold resistance. It is the main raw material for the production of bridge bearings. However, the market price of natural rubber has been unstable. It once broke through the 40,000 mark and fell into the abyss below 10,000. Natural rubber bridge bearing manufacturers can not help but repeatedly experience great joys and sorrows; therefore, more people are willing to use low-cost and non-fluctuating composite natural rubber to produce rubber bridge bearings. What problems should it pay attention to during use? How to design a rubber bridge bearing formula with composite natural rubber as the main raw material?
The rubber bridge bearing is an important structural component linking the upper structure and the lower structure of the bridge. The load and deformation of the upper structure of the bridge are transmitted to the lower structure of the bridge. Therefore, the physical and mechanical strength is required to be extremely high. Currently, the vulcanizing agent commonly used in vulcanization of rubber products is required. It can be used not only for sulfur, but also for peroxides, resins, etc. Different types of vulcanizing agents have different properties after vulcanization. The vulcanized materials of traditional sulfur vulcanization systems have high strength, good dynamic properties and static properties. The ideal choice for natural rubber production of bridge supports, together with the use of accelerator CZ can further improve the degree of vulcanization of the rubber.
The mechanical properties of the rubber bridge bearing produced by the composite natural rubber are not only related to the quality of the rubber compound and the vulcanization system. The reinforcing system is another shortcut to improve the mechanical properties of the bridge support; the soft carbon black in the carbon black product is in the rubber compound. The reinforcing effect is not as good as that of hard carbon black, but it has good elasticity and excellent fatigue resistance, which can significantly improve the viscoelasticity and flexural flexibility of the rubber compound, thereby improving the creep property and pressure resistance of the rubber compound; Meet the performance requirements of rubber bridge bearings.
The cold resistance of composite natural rubber has a certain loss in the production process. Rubber bridge bearing manufacturers need to increase the cold resistance of the rubber compound by appropriate amount of plasticizer; however, the plasticizer will increase the cold resistance of the bridge support. The creep properties of the compound, so plasticizers must be carefully selected and minimized.
Composite natural rubber will add other rubber or chemical compounding agent in the production process. Its own stability and aging resistance are better than natural rubber, but there is still a certain gap compared with synthetic rubber. At the same time, the rubber compound after vulcanization of ordinary sulfur vulcanization system The heat-resistant oxygen aging performance is inferior to that of the peroxide vulcanization system or the semi-effective vulcanization system and the vulcanization of the effective vulcanization system. Therefore, the anti-aging agent is indispensable in the rubber bridge bearing formula processed by the composite natural rubber as the main raw material. Rubber bridge bearings are used in the open air. Many factors in the external environment will act on the rubber bearings at the same time. Therefore, rubber manufacturers should use several anti-aging agents together. Anti-aging agent 4010, anti-aging agent D, anti-aging agent UOP88, anti-aging agent MB is good.
The use of composite natural rubber to produce rubber bridge bearings can not only reduce the cost of raw materials, but also alleviate the impact of natural rubber cost fluctuations on rubber products manufacturers, and is an ideal raw material to replace natural rubber. In the production of rubber bearings, composite natural rubber not only needs to pay attention to the cooperation of various matching systems, but also needs to strictly perform the established work operations. The small series will discuss this issue with you later.