Latex recycled rubber retains the basic performance characteristics of natural rubber, with good feel elasticity, high tensile strength, high tear elongation, and good compatibility with natural rubber, which can completely or partially replace natural rubber in the production of rubber tires in different use occasions and reduce raw material costs. When rubber tire manufacturers use natural latex recycled rubber to reduce production costs, they must consider the following issues.
1. Consider the performance requirements of different parts of rubber tires
Rubber tires can be divided into passenger car tires, agricultural vehicle tires, motorcycle tires, bicycle tires, etc. according to the use, different types of tires have different physical performance requirements for rubber E5LYY128, and the latex recycled rubber used and the amount of rubber are very different. For example, rubber tire tread adhesive has high requirements for wear resistance and tear strength, and generally uses high-strength latex recycled adhesive; The proportion of latex recycled rubber in passenger car tire tread adhesive is generally ≤ 30%, and the physical properties of bicycle tire tread adhesive are not high, and even recycled rubber can be used completely.
Tire sidewall adhesive has higher requirements for buckling and aging resistance, and the air tightness and compression set of rubber tube compound are more critical.
2. Consider the effective rubber hydrocarbon content, tensile strength and Mooney viscosity of latex recycled rubber
When choosing latex recycled rubber for each part of rubber tires, it is necessary to focus on the effective rubber hydrocarbon content, tensile strength, fineness, color, etc. of latex recycled rubber.
(1) Look at the rubber content of latex recycled rubber: the higher the effective rubber hydrocarbon content, the closer the performance of latex recycled rubber is to natural rubber, and the elasticity and strength are better. High-glue latex recycled rubber is suitable for tire tread adhesive or high-end stroller tires with high wear resistance and puncture resistance, while products with low rubber content are more suitable for low-load cushion belts or low-end solid tires.
(2) Look at the fineness of latex recycled rubber: The fineness of latex recycled rubber directly affects the appearance quality of rubber tires, and when using latex recycled rubber to produce rubber inner tubes or rubber tires with extremely high appearance requirements, it is recommended to choose ultra-fine filtered latex recycled rubber, which has a smooth surface and excellent air tightness of the inner tube.
(3) Look at the color and migration of latex recycled rubber: when using latex recycled rubber to produce light-colored and colored rubber tires, it is recommended to choose white latex recycled rubber, which is easy to match; black or dark rubber tires choose black latex recycled rubber, which is more cost-effective; Choose latex recycled rubber that does not change color and do not migrate, and the finished tires will not have problems such as discoloration and yellowing.
(4) Look at the environmental protection of latex recycled rubber: When using latex recycled rubber to produce stroller tires and other products, it is recommended to choose environmentally friendly latex recycled rubber that has passed the environmental protection RoHS certification.
3. Consider the influence of latex recycled rubber components on rubber formulation
When latex recycled rubber is mixed in the rubber tire formula, the pure original rubber formula cannot be directly copied, and the replacement ratio of recycled rubber in the formula and the amount of compounding agent need to be appropriately adjusted. Natural recycled rubber contains inorganic fillers, which should be converted according to the effective rubber hydrocarbon content when replacing natural rubber, and cannot be directly replaced according to the weight 1:1. In the process of desulfurization, part of the old network structure remains in the latex recycled glue, and the amount of sulfur-accelerator needs to be appropriately increased to ensure that the rubber material is fully vulcanized. Black latex recycled rubber contains a certain amount of carbon black, anti-aging agents, etc., and the amount of these compounds in the formula needs to be appropriately reduced.
4. Consider the processing process performance of latex recycled glue
Latex recycled rubber has been kneaded in the early stage during the production process, has good plasticity and fluidity, and does not need to be smelted separately. When using latex recycled rubber and natural rubber together to produce rubber tires, it is recommended to wait for the natural rubber to be fully plasticized before mixing with the recycled rubber, or add fillers to the natural rubber plastics and then mix the recycled rubber to ensure uniform dispersion. The vulcanization speed of latex recycled rubber is generally faster than that of raw rubber, so attention needs to be paid to the matching of vulcanization time, and the sulfur-accelerator system should be adjusted if necessary.
5. Consider the price and quality stability of latex recycled rubber
When using latex recycled rubber to reduce the cost of rubber products, it is necessary to consider the price and quality stability of latex recycled rubber. Conduct sampling inspections on the physical properties of each batch of recycled rubber, including tensile strength, tear elongation, fineness, impurities, etc., to avoid batch fluctuations affecting production.
When rubber tires use latex reclaimed rubber to reduce costs, if used properly, the cost reduction effect is immediate; if used improperly, it can cause endless problems. It is essential to choose latex reclaimed rubber with suitable color and specifications according to the actual usage scenarios of the rubber tires, reasonably design the formulations of various parts of the rubber tires containing reclaimed rubber, strictly control the production process, and achieve cost reduction and efficiency improvement while ensuring tire performance and lifespan.
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