Process for processing nature rubber

Abstract

The invention relates to the processing field of natural rubber, and discloses a rubber processing process. The process comprises procedures of crushing, creping, granulating, baking, weighing and packaging. The process is characterized by adding an extruding procedure following the crushing procedure, wherein, the extruding procedure is repeated twice, the creping procedure is repeated eight times, and the granulating procedure is repeated twice. The process can help further remove foreign matters and ash from the rubber, enhance consistence of the rubber, achieve better softness of the rubber, ensure even mixing of different batches of raw materials with different quality conditions, wholly enhance consistence and stability of the physical and chemical properties of finished products, produce rubber materials for manufacturing high-quality tires, make full use of the raw materials with different quality conditions, greatly relieve limitation of raw material selection, and enhance added value of the products.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a processing technology of natural rubber. Background technique [0002] Rubber products are widely used in various fields of the national economy due to their high elasticity and high air tightness. Tires are the leading products in the rubber processing industry, and their rubber consumption accounts for more than 70% of the total rubber consumption of rubber products. Radial tire is an updated product of the tire industry. It has the advantages of safe driving, low rolling resistance, fuel saving and wear resistance, so it is developing rapidly in all countries in the world. Natural rubber is the key raw material for the production of radial tires, which determines the quality of radial tires to a large extent. [0003] Special rubber for radial tires has particularly high requirements on quality grade and quality stability, and the current domestic processing technology is ...

AI Technical Summary

Problems solved by technology

[0004] The current domestic rubber processing technology is usually directly granulated after crushing. The particle size of the crushed rubber material is still relatively large, and most of the impurities are still wrapped in the rubber block, which is not conducive to subsequent processing. The processed rubber contains excessive impurities and is clean. The low degree of granulation cannot meet the requirements of high-quality tire production technology. Even if the number of granulation is increased, the effect of reducing the impurity content and improving the cleanliness is not obvious, and too many granulation times will also cause the rubber molecular chain to be destroyed. The mechanical shear force breaks or destroys, which reduces the degree of polymerization of the rubber monomer (polyisoprene), that is, the molecular weight, which directly affects the plastic initial value (P0), Mooney viscosity (MOONEY VISCOSITY) and hardness of the finished product. It destroys the unique high elasticity and physical and mechanical properties of rubber itself

At the same time, the sources of natural rubber raw materials are diverse, that is, from different regions and different rubber farmers and rubber suppliers, and the quality is uneven and highly variable.

If the mixing is not done well, the physical and chemical indicators such as impurity content, ash content, nitrogen content, plastic initial value, anti-oxidation index, Mooney viscosity and other physical and chemical indicators of the finished product may fluctuate unevenly and unstable, which will inevitably bring serious problems to tire manufacturers. The frequent changes in the process in the past may even lead to the generation of waste products, and the direct crepe and granulation after crushing often lead to insufficient mixing of rubber materials, poor removal of impurities and ash, so it is necessary to improve the existing rubber processing technology to improve the consistency of rubber performance, stability and cleanliness