Nitrile reclaimed rubber has the basic performance characteristics of nitrile rubber, and can directly replace nitrile raw rubber or be used in combination with raw rubber to produce oil-resistant and wear-resistant rubber products. On the premise of ensuring product quality, the cost of raw materials can be effectively reduced, and the rational use of fillers can reduce more cost. The commonly used fillers for nitrile reclaimed rubber products are clay, calcium carbonate, magnesium carbonate, alumina, talc, mica powder, etc. Today, Xiaobian will share with you the filling skills of clay and calcium carbonate in nitrile reclaimed rubber products.
1. Filling skills of clay in nitrile reclaimed rubber products
Clay is currently the most used silicate in the rubber product industry. Hard clay has a good reinforcing effect in nitrile reclaimed rubber products. After filling with clay, the reclaimed rubber has higher viscosity, greater stiffness and smaller shrinkage rate. , The surface of the extrudate is smoother. It should be noted that when using nitrile reclaimed rubber to produce rubber products with high elasticity or low compression set, it is recommended to use less or no hard clay.
Nitrile reclaimed rubber products are filled with clay. The clay contains a large number of hydroxyl hydrophilic groups. It is recommended to use a silane coupling agent to modify it to make the clay change from hydrophilic to lipophilic. In actual production, the dispersed phase of modified clay in nitrile reclaimed rubber is better, which can enhance the interface among filler and rubber; theoretically, the clay modified by filling with stearic acid and silane coupling agent, but The elongation at break of nitrile reclaimed rubber vulcanizate is higher.
2. Filling skills of calcium carbonate in nitrile reclaimed rubber products
Calcium carbonate is one of the most commonly used fillers in nitrile reclaimed rubber and nitrile rubber/reclaimed rubber products, which can endow the rubber with good process performance. Compared with compounding agents such as carbon black, self-carbon black and clay, calcium carbonate has poor reinforcing properties, but the nitrile reclaimed rubber vulcanizate filled with calcium carbonate has better tear strength, flex resistance, permanent deformation and rebound rate.
Calcium carbonate has low water absorption and is not resistant to chemical corrosion. It can be used to produce electrical insulating rubber products, but it is not suitable for acid-resistant products. Calcium carbonate has a good application effect in nitrile reclaimed rubber and oil-resistant products. When nitrile reclaimed rubber products are filled with calcium carbonate, they can be used together with active reinforcing agents to achieve the dual purpose of improving process performance and improving physical and mechanical properties. Calcium carbonate is mostly used for filling in nitrile reclaimed rubber products for the purpose of compatibilization. It is necessary to consider the comprehensive physical property requirements of the products and reasonably control the amount of calcium carbonate.
When using nitrile reclaimed rubber to produce rubber products, rubber product manufacturers can also fill in appropriate amounts of magnesium carbonate, alumina, talc, mica powder, etc. according to actual needs. Later, the editor will continue to share relevant issues with you.
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