Calcium carbonate is a commonly used filler in the production of reclaimed rubber products. It features abundant resources, low toxicity and pollution, high whiteness, large filling volume, and low cost. It can reduce costs, improve processing technology, and enhance the overall performance of reclaimed rubber products. The production methods, performance characteristics, and product prices of heavy and light calcium carbonate differ; When using reclaimed rubber to produce rubber products, is it better to use heavy calcium or light calcium?
1. Basic properties of light calcium carbonate and its role as reinforcing and filling in reclaimed rubber
Light calcium carbonate is a white powder, odorless, with regular particle shapes, narrow particle size distribution, and small particle size. It is a commonly used white reinforcing filler in the production of reclaimed rubber products. It disperses easily in the rubber compound and has semi-reinforcing properties, does not affect vulcanization, and can improve the tensile strength, tear strength, and wear resistance of vulcanized reclaimed rubber, and does not cause excessive fixed elongation stress under high filling. The physical and mechanical properties of recycled rubber vulcanized rubber are slightly higher than those of vulcanized rubber filled with heavy calcium carbonate.
2. Basic properties of heavy calcium carbonate and its reinforcing and filling role in reclaimed rubber
Heavy calcium carbonate is a white powder with irregular shape, large particle size, and wide distribution. It can be directly mixed into rubber, is easy to process, increases the toughness of the compound compound, and does not delay vulcanization E6LYY114. A moderate amount of heavy calcium carbonate filling reclaimed rubber products does not significantly affect the physical and mechanical properties of the reclaimed rubber; However, if the heavy calcium particles are too large, the physical and mechanical properties of the vulcanized rubber will significantly decrease. Reclaimed rubber with heavy calcium carbonate is not as mechanical as that of light calcium or activated calcium carbonate, but it is less expensive and has lower fixed tensile stress in vulcanized rubber. It can be used together with reinforcing agents or other fillers to adjust the performance of reclaimed rubber products.
3. Is it better to use heavy or light calcium for reclaimed rubber products?
(1) Which reclaimed rubber products should prioritize lightweight calcium carbonate?
When reclaimed rubber products require high physical and mechanical properties, choosing lightweight calcium carbonate is more suitable, as it can effectively improve the tensile strength, tear strength, and wear resistance of vulcanized reclaimed rubber.
When using reclaimed rubber to produce tire tread rubber, conveyor belt cover rubber, hose outer layer rubber, seals, shock absorbers, and other rubber products that must withstand significant tensile stress, frequent friction, or dynamic fatigue, using light calcium can maintain good mechanical properties at high filling volumes, resulting in better performance and durability of reclaimed rubber products; When producing rubber products with high requirements for appearance whiteness and surface finish using white reclaimed rubber, or when coordinating colors with other light-colored additives, light calcium offers higher whiteness and finer texture.
(2) Which reclaimed rubber products should prioritize heavy calcium carbonate?
Reclaimed rubber products do not require high mechanical properties but are sensitive to cost control, choosing heavy calcium carbonate offers better cost performance. Using reclaimed rubber to produce low-grade rubber sheets, ordinary rubber pads, filler compounds, shoe sole midlayers, rubber floor mats, waterproof membranes, and other products with relatively flexible mechanical performance requirements, with appropriate heavy calcium filling can further reduce raw material costs without significantly sacrificing performance.
Both heavy calcium carbonate and light calcium carbonate are commonly used fillers in reclaimed rubber products. There is no absolute superiority among the two. Light calcium carbonate has the advantage in performance, while heavy calcium carbonate has a better cost control. The choice should be based on the specific use, performance requirements, and cost budget of the reclaimed rubber product.
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