Latex recycled rubber processed from waste natural rubber, waste latex and its products as raw materials has the characteristics of high strength, good elasticity, small specific gravity, etc., and has good compatibility with natural rubber, styrene-butadiene rubber and butadiene rubber, which can replace natural rubber to produce various types of rubber tires, and reduce the cost of raw materials under the premise of ensuring the performance and life of tires. Which rubber tires can be mixed with latex recycled rubber, and what issues should be paid attention to when choosing latex recycled rubber?
1. Key points of application of latex recycled rubber in passenger car tires
Passenger car tires have strict requirements for durability and low rolling resistance, and it is recommended to follow the principle of "zoning control and limited mixing" when mixing latex recycled rubber to reduce costs. Passenger car tire tread adhesive has strict requirements for grip and wear resistance, and can be mixed with 5%-10%; The sidewall adhesive has higher requirements for the flexural deformation resistance and ozone resistance of the rubber, and can generally be mixed with 15%-20% latex recycled rubber to improve the fatigue resistance of the sidewall. The bottom layer of the passenger car tire tread, the carcass cord layer and other parts can also be mixed with natural latex recycled rubber in an appropriate amount.
When passenger car tires are mixed with latex recycled rubber, it is recommended to choose black latex recycled rubber with a tensile strength of more than 12MPa, which is more cost-effective, especially tread adhesive, to ensure that the tire tread E5LYY122 has good wear resistance and tear resistance; If necessary, a reinforcement system with high wear resistance carbon black and silica can be used to effectively improve the wear resistance of passenger car tire tread compound. When latex recycled rubber replaces some natural rubber to produce different parts of passenger car tires, the sulfur-accelerator system is mostly used for vulcanization, and the mechanical strength of vulcanized rubber is higher.
2. Application points of latex recycled rubber in agricultural vehicle tires
Agricultural vehicle tires need to drive in a variety of complex road conditions such as farmland and gravel roads, and have high requirements for wear resistance, puncture resistance and bearing capacity of tires, so first of all, the mechanical strength of tires needs to be considered. When using latex recycled rubber to reduce the cost of agricultural vehicle tires, about 30% latex recycled rubber can be mixed in the sidewall rubber of bias tires of agricultural vehicles, and it is recommended to mix 10%-20% natural recycled rubber in the tread glue, and a large amount of latex recycled rubber can be mixed with the bead part to effectively reduce the cost of raw materials.
Agricultural vehicle tires are mixed with latex recycled rubber, it is recommended to choose black natural recycled rubber, the price of black latex recycled rubber with the same indicator is lower than the price of white latex recycled rubber.
When producing agricultural vehicle tires with latex recycled rubber, it is recommended to use the sulfur-accelerator DM-accelerator CZ vulcanization system. High wear-resistant carbon black reinforcement, if necessary, a small amount of silica can be added to improve the performance of the rubber material; The use environment of agricultural vehicle tires is mostly exposed to the outdoors, greatly affected by natural factors such as sunlight and rain, and has high requirements for aging resistance.
3. Key points of application of latex recycled rubber in motorcycle tires
Motorcycle tires are divided into two types: tubeless tires and tubes, which have high requirements for tire grip, elasticity and tear resistance. Latex recycled rubber can replace some natural rubber to produce the inner tube, sidewall and tread auxiliary layer of motorcycle tires, reducing the cost of raw materials. 30%-40% latex recycled rubber can be mixed with motorcycle tire tread adhesive to improve tread elasticity and cushioning; sidewall rubber can be mixed with 20%-30% natural recycled rubber, with a small amount of butadiene rubber, to further improve the anti-fatigue and tear resistance of sidewall rubber; Ultrafine latex recycled rubber can also be used in the production of motorcycle tubes.
When choosing latex recycled rubber for motorcycle tires, it is necessary to strictly control the impurity content and Mooney viscosity of the rubber material, especially the motorcycle inner tube. When designing the formula of different parts of motorcycle tires containing latex recycled rubber, the vulcanization system should be reasonably adjusted, and high-efficiency accelerators should be used to ensure that the rubber material is fully vulcanized, improve the overall performance of the tires, and meet the requirements of high-speed motorcycle driving.
4. Key points of the application of latex recycled rubber in bicycle tires
Bicycle tires have basic wear resistance, elasticity and puncture resistance, and do not require high physical and mechanical properties, and can generally be mixed with a large amount of latex recycled rubber, including bicycle tire tread rubber, sidewall rubber and inner tube. The amount of latex recycled rubber in the tread glue of bicycle tires can reach 20%-40%, with an appropriate amount of styrene-butadiene rubber, and the use of high-hardness carbon black reinforcement to further improve the elasticity and wear resistance of the tire. The dosage of latex recycled rubber in the sidewall glue was controlled at 30%-40%.
When choosing latex recycled rubber for different parts of bicycle tires, light-colored tires can use white latex recycled rubber, which is easy to match color and not easy to change color; Black tires use black natural recycled rubber, which is cheaper; The inner tube of the bicycle can be mixed with ultra-fine filtration latex recycled glue, and the inner tube has better air tightness. In actual production, latex recycled rubber can be used in combination with natural rubber and butadiene rubber, or combined with tire recycled rubber and isoprene recycled rubber to prepare bicycle tires with different performance needs, so as to reduce more costs under the premise of ensuring tire performance.
Latex recycled rubber has a wide range of applications in rubber tires, and when choosing latex recycled rubber for rubber tires, it is necessary to pay attention to the tensile strength, glue content and fineness index of recycled rubber. Compared with raw rubber, the sulfur and accelerators used in rubber tire formulations mixed with latex recycled rubber can be increased by about 20%, ensuring that the compound is fully vulcanized. The core is to reasonably mix latex recycled rubber under the premise of ensuring tire performance, service life and safety to reduce costs and increase efficiency.
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