Tire reclaimed rubber is made from the rubber part of waste automobile tires, which is made by crushing, desulfurization, refining and other processes, and has the performance characteristics of good elasticity, high strength, wear resistance and anti-aging. Polyvinyl chloride (PVC) is a polymer formed by the polymerization of vinyl chloride monomer in peroxides, azo compounds and other initiators or under the action of light and heat according to the free radical polymerization reaction mechanism, with good tensile, bending, compression and impact resistance. Tire reclaimed rubber is blended with PVC material to prepare waterproofing membrane, with low cost and good performance.
1. Modify the tire reclaimed rubber
The main components of tire reclaimed rubber are natural rubber, styrene-butadiene rubber and carbon black, which are different from the molecular structure and performance characteristics of PVC, with large differences in solubility parameters and poor mutual miscibility, so it is necessary to use phase compatibilizers to modify the reclaimed rubber, such as nitrile rubber, neoprene, chlorinated polyethylene, ABS, etc. When nitrile butadiene rubber (NBR) 26 is used as a compatibilizer, the dosage is more than 3.5%, and the comprehensive performance of tire reclaimed rubber/PVC blend is better.
2. Tire reclaimed rubber is fully plasticized: reduce the elasticity of the rubber material, improve the plasticity and fluidity of the rubber material, and when the tire reclaimed rubber is fully plasticized and blended with PVC, it is easy to mix evenly with other materials.
3. Tire reclaimed rubber and polyvinyl chloride blend to prepare waterproofing membrane formula design skills
When preparing waterproofing membranes by tire reclaimed rubber/PVC blending, it is necessary to reasonably determine the addition ratio of reclaimed rubber and PVC, and select appropriate plasticizers, reinforcing agents, fillers, etc. With the increase of PVC content, the tear strength and tear strength of tire reclaimed rubber/PVC blend gradually increased, and the tear elongation decreased. According to the use occasion and performance requirements of the waterproofing membrane, the addition ratio of PVC and reclaimed rubber should be reasonably adjusted. After the use of plasticizer TOP, the hardness and rigidity of tire reclaimed rubber/PVC blend are reduced, and the elasticity and flexibility are improved.
4. Key points of the production process of tire reclaimed rubber and polyvinyl chloride blending to prepare waterproof membranes
When tire reclaimed rubber is blended with PVC, the blending temperature is recommended to be controlled among 160-170 °C, which is higher than the softening temperature of PVC, and the PVC is in a molten state and can be evenly dispersed in the rubber phase. The blending temperature is too low, the dispersion uniformity of PVC in tire reclaimed rubber is poor, and the tensile strength and elongation at break of the blend are low. If the blending temperature is too high, PVC is easy to decompose, tire reclaimed rubber is easy to crack, and the performance of the blend is reduced.
When tire reclaimed rubber is blended with PVC, the blending time is controlled at about 15min. The blending time is too short, and the PVC blocks are large and unevenly distributed, making it difficult to form sheets.
Tire reclaimed rubber can be blended with polyvinyl chloride, in sulfur, accelerator, antioxidant, zinc oxide, stearic acid, clay, dioctyl phthalate and other compounding agents to prepare waterproof membrane E4LYY821, can prepare good performance, low price of waterproof membrane, it is recommended to choose tire tread reclaimed rubber, good elasticity, high plasticity, low impurity content; The use of waste plastic film instead of PVC resin can further reduce the cost of waterproofing membrane, and related issues will be discussed with you later.
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