Rubber abrasion resistance is to characterize the ability of vulcanized rubber to resist material loss due to surface damage under the action of friction, and is a mechanical property closely related to the service life of rubber products. When using reclaimed rubber to produce rubber products with high wear resistance requirements, such as tires, conveyor belts, dynamic seals, and rubber shoe outsoles, it is necessary to reasonably design the formula of recycled rubber products to improve the wear resistance of recycled rubber products.
1. Formula design of high wear-resistant recycled rubber products - raw rubber
When using reclaimed rubber to produce high wear-resistant rubber products, it is first necessary to choose reclaimed rubber with good wear resistance, such as tire tread reclaimed rubber with better wear resistance than whole tire reclaimed rubber; Or it can be used in combination with rubber with good wear resistance, such as butadiene rubber E4LYY1226 which has the best wear resistance in general rubber, or it can be used in combination with natural rubber, styrene-butadiene rubber, and nitrile rubber to improve the wear resistance of recycled rubber products; The combination of reclaimed rubber and original rubber to improve the wear resistance of the product requires the selection of appropriate original rubber according to the variety of reclaimed rubber.
2. Formula design of high wear-resistant recycled rubber products - vulcanization system
Reasonable design of vulcanization system can effectively improve the wear resistance of recycled rubber products, and the cross-linking density and cross-linking bond type of reclaimed rubber will affect the wear resistance of rubber products.
(1) Cross-linking density: appropriately increase the cross-linking density, the abrasion resistance of reclaimed rubber has a certain optimal value with the increase of cross-linking density, when the abrasion resistance reaches the best, the optimal sulfur dosage is related to the structure of carbon black, and decreases with the increase of carbon black dosage and the improvement of structure.
(2) Cross-linked bond type: The type of cross-linked bond will affect the wear resistance of rubber, and the abrasion resistance of sulfur + accelerator CZ system is better, and the vulcanized rubber vulcanized with DTDM + sulfur (less than 1.0 parts) + accelerator NOBS system has better wear resistance and other mechanical properties. Experiments have shown that the formation of single sulfide bonds by vulcanized rubber can improve the wear resistance of tires on smooth roads.
3. Formula design of high wear-resistant recycled rubber products - reinforcing system
The variety, dosage and dispersion degree of compounding agent in the formula reinforcing filling system of recycled rubber products directly affect the wear resistance of rubber compounds. With the decrease of carbon black particle size, the specific surface area, surface activity and dispersibility increased, and the wear resistance of reclaimed rubber vulcanized rubber increased. There is an optimal value in the relationship curve among the amount of carbon black and the wear resistance of vulcanized rubber. The use of silane-coupled silica can also improve the abrasion resistance of reclaimed rubber vulcanized rubber.
4. Formula design of high wear-resistant recycled rubber products - softening system
The addition of softening plasticizer will reduce the wear resistance of reclaimed rubber vulcanized rubber, and under the condition that the process performance allows, try not to use or reduce the amount of softener, which can improve the wear resistance of reclaimed rubber vulcanized rubber; When reclaimed rubber is used in combination with natural rubber and styrene-butadiene rubber, aromatic oil is used, and the loss of wear resistance of reclaimed rubber vulcanized rubber is small.
5. Formula design of high wear-resistant recycled rubber products - anti-aging system
Appropriate amount of antioxidant is added to the formula of reclaimed rubber products to improve the heat resistance, fatigue resistance and destructive properties of the rubber, which can effectively improve the wear resistance of the rubber; Antioxidants are recommended to use varieties that can prevent fatigue aging, such as antioxidant 4010NA, antioxidant H, etc.
6. Formula design of high wear-resistant recycled rubber products - modifying additives
The appropriate use of carbon black modifier, silane coupling agent and surfactant modified filler, rubber-plastic blending, and surface treatment of vulcanized rubber can improve the wear resistance of reclaimed rubber vulcanized rubber.
The formula design of high wear-resistant recycled rubber products needs to comprehensively consider the influence of rubber raw materials and additives such as raw rubber, vulcanization system, reinforcing system, softening system and other rubber materials on the wear resistance of rubber compounds, reasonably select raw rubber and compounding agents, and strictly control the dosage of compounding agents, which can effectively improve the wear resistance of recycled rubber products, prolong their service life, meet the strict requirements for the wear resistance of rubber products in different application scenarios, and promote the wide application of recycled rubber products in more high-performance fields.
Exclusive original article [commercial authorization] reprint, excerpt and excerpt in any form are prohibited without written authorization. Focus on Hongyun rubber: learn the process formula and raw material technology of producing rubber products from recycled rubber to help you reduce costs and increase profits