Recycled rubber processed by physical and chemical processes such as crushing, heating, mechanical and chemical treatment of waste rubber products has certain plasticity and viscosity, and can be processed and re-vulcanized and reused in the production of rubber products, replacing high-priced raw rubber can effectively reduce raw material costs. When using recycled rubber to produce rubber products, the quality of recycled rubber products is affected by a variety of factors, which are reflected in the following aspects.
1. Recycled rubber variety and quality
(1) Recycled rubber varieties
Different varieties of recycled rubber have different performance characteristics, rubber product manufacturers first need to choose the appropriate recycled rubber according to the performance characteristics of the product and the type of raw rubber used. For example, when using natural rubber as the main raw material to produce rubber products with high elasticity and wear resistance, you can choose latex recycled rubber, high-strength tire recycled rubber, etc.; Rubber products that work outdoors for a long time can choose EPDM recycled rubber; Nitrile recycled rubber is chosen for oil-resistant rubber products; Highly airtight rubber products use butyl recycled rubber, etc.
(2) The quality of recycled rubber
The quality of recycled rubber from different manufacturers is different. The hydrocarbon content, fineness, impurity content, and moisture content of recycled rubber rubber will affect the quality of the product. Take latex recycled rubber as an example: the higher the hydrocarbon content of effective rubber, the better the elasticity and the higher the mechanical strength; There are too many impurities in recycled rubber, which affects the appearance of rubber products. In the production of recycled rubber products, it is necessary to schosen recycled rubber with appropriate indicators and stable quality according to the performance requirements of rubber products. Recycled adhesive should have a uniform texture and be free of impurities such as metal chips, wood chips, sand particles and fine fibers.
2. The variety and dosage of compounding agents in the formulation of recycled rubber products
When using recycled rubber to produce rubber products, the variety and dosage of compounds in the vulcanization system, reinforcement filling system, softening plasticization system, and anti-aging system matching system directly affect the quality of recycled rubber products. For example, the recycled rubber vulcanized adhesive vulcanized by ordinary sulfur vulcanization system has high mechanical strength, and the recycled adhesive vulcanized rubber vulcanized rubber with peroxide vulcanization system has good heat resistance. Carbon black with a small particle size can improve the tensile strength of recycled adhesives, but it will reduce the elasticity of the compound.
3. Production process of recycled rubber products
When using recycled rubber to produce rubber products, insufficient plasticization may lead to insufficient plasticity of the compound, affecting subsequent processing. In the mixing process, uneven mixing will lead to inconsistent product performance, such as reduced physical E5LYY1029 mechanical performance, poor aging resistance, etc. When vulcanizing recycled rubber products, insufficient or excessive vulcanization will reduce the flexural fatigue resistance of the product. The temperature during the extrusion process of recycled rubber, the plasticity of the compound, and the adhesive content will affect the extrusion speed, dimensional stability and appearance quality of the semi-finished product.
Therefore, when using recycled rubber to produce rubber products, the plastic, compounding and vulcanization process conditions must be reasonably determined according to the processing performance of the recycled rubber and the shape and size of the rubber products, so as to ensure that the compound is evenly dispersed during the mixing of recycled rubber and the rubber material is fully vulcanized during vulcanization.
In the production of recycled rubber products, ambient temperature and humidity will also affect the quality of the product, too high or too low temperature will affect its viscosity, fluidity, scorching safety, etc., and too high temperature may lead to early vulcanization of the rubber material; Ambient humidity can affect the moisture content of recycled rubber, and excessive moisture may lead to bubbles in recycled adhesive products. When using recycled rubber to produce rubber products, strict quality control measures and unified quality inspection standards must be established to reduce more costs under the premise of ensuring the stable quality of recycled rubber products.
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