Nitrile rubber has excellent oil resistance, good heat resistance, wear resistance, and strong adhesion, and is an ideal raw material for the production of oil-resistant and wear-resistant rubber products, such as oil-resistant seals, hoses, conveyor belts, etc. As a low-cost substitute raw material for nitrile original rubber, nitrile reclaimed rubber is more and more widely used in rubber products. What are the differences among nitrile reclaimed rubber and nitrile original rubber? How to correctly choose nitrile rubber for rubber products?
1. Production process of nitrile reclaimed rubber and nitrile rubber
(1) Nitrile rubber is a copolymer formed by polymerization of acrylonitrile and butadiene monomer, which is mainly produced by low-temperature emulsion polymerization.
(2) Nitrile reclaimed rubber is made of waste nitrile rubber products such as nitrile bottle stoppers, textile rollers, oil seals, etc., which are processed by crushing, desulfurization, rolling and other processes, and retain the basic performance characteristics of nitrile rubber.
2. Performance characteristics of nitrile reclaimed rubber and nitrile rubber
(1) Advantages and disadvantages of nitrile rubber
Nitrile rubber has excellent oil resistance and good resistance to various mineral oils, animal and vegetable oils and vegetable oils; It has high tensile strength, tear strength and compression rebound rate; Excellent heat resistance, can maintain good physical and chemical properties below 150°C; Good chemical resistance, good resistance to acids, alkalis, solvents, etc.; High abrasion resistance.
Nitrile butadiene rubber has the defects of insufficient aging resistance, water resistance, and high cost, and will produce a certain odor during processing.
(2) Advantages and disadvantages of nitrile reclaimed rubber
Nitrile reclaimed rubber retains the excellent oil resistance, good wear resistance and heat resistance of nitrile rubber. Compared with nitrile rubber, nitrile reclaimed rubber has better fluidity and plasticity, less expansion and contraction of unvulcanized rubber products, less processing heat, and good vulcanization flatness; Stable aging resistance and good weather resistance.
The mechanical strength and hand elasticity of nitrile reclaimed rubber are slightly lower than those of nitrile original rubber, which can appropriately increase the amount of filler and improve the tensile tensile properties of nitrile reclaimed rubber products.
3. Nitrile reclaimed rubber and nitrile rubber processing skills
(1) Nitrile rubber processing skills
When using nitrile rubber to produce oil-resistant and wear-resistant rubber products, it is necessary to clean or dry the rubber material in advance, and the nitrile butadiene rubber with high temperature or high moni viscosity needs to be plasticized at low temperature, and the temperature and roller distance need to be controlled during plastic refining, and the segmented plastic refining method is adopted. The heat generation is large during mixing, and the roller needs to be fully cooled; When molding and extruding, it is necessary to pay attention to temperature and pressure control to avoid bubbles and cracks.
(2) Nitrile reclaimed rubber processing skills
When using nitrile reclaimed rubber to reduce the production cost of rubber products, it is necessary to select the appropriate nitrile reclaimed rubber according to the physical property requirements of rubber products, reasonably determine the mixing ratio of reclaimed rubber and appropriately adjust the rubber formula E5LYY221. When nitrile reclaimed rubber and nitrile rubber are used together, the nitrile raw rubber is usually molded first, and then mixed with nitrile reclaimed rubber. The calendering and extrusion temperatures should be lower; Appropriate use of plasticizers to further improve process performance; In the case of composite processing, it is necessary to ensure surface cleanliness and improve adhesion through pretreatment.
Nitrile rubber oil resistance, wear resistance is better but the price is high, nitrile reclaimed rubber inherits the basic performance characteristics of nitrile rubber, good processing performance, the price is much lower than nitrile rubber, both have their own advantages in oil resistance, processing performance and price, rubber products manufacturers need to choose the right nitrile rubber according to the use environment, performance requirements, production equipment, cost budget, etc. of rubber products, it is recommended that nitrile rubber and nitrile reclaimed rubber be used in an appropriate proportion to produce better performance, lower cost and cost-effective nitrile rubber products.
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