According to the environmental conditions of rubber products, with the passage of time, it causes cracking or hardening, rubber physical properties degradation and other phenomena, which is called aging phenomenon. Causes of aging, internal factors. Internal factors: the internal factors include the type of rubber, molding method, bonding degree, the type of matching drugs, factors in processing engineering, etc. The prevention of aging phenomenon, focusing on the correct choice of rubber and formula design, plus rigorous production philosophy. Only in this way can the service life of rubber products be increased and their special functions be exerted.

The molecular structure of raw rubber is an elastomer with long unsaturated bond. Therefore, in the process of molding, appropriate drug additives and external environmental factors (such as time, temperature, pressure, etc.) are needed to destroy its unsaturated bond, and then re combine it into a saturated bond. With the assistance of vacuum, the air inside is completely forced out. Only in this way can the formed rubber give full play to its proper characteristics. If there are any defects in the molding process (such as wrong formula, insufficient time, improper temperature, etc.), it can cause the loss of physical…

The preparation of rubber raw materials can be divided into three basic processes. 1. plastic refining: Plastic training is to cut raw rubber and make raw rubber plasticized and even, and help mix mixing of mixture. The effect is to improve the dispersion of drugs, prevent friction heat in operation, and cause the burning of rubber, and then change the processability of rubber. 2. mixing: mixing is to mix the combined drugs into the raw rubber which is finished by plastic refining, and the advantages and disadvantages of the mixing directly affect the product quality or not. The drug is…

Through the analysis of the chemical composition of natural rubber, it is found that its basic composition is isoprene. So inspired people to use isoprene as a monomer for polymerization reaction to get synthetic rubber, called isoprene rubber. The structure and properties of isoprene rubber are basically the same as those of natural rubber. At that time, isoprene could only be obtained from turpentine, and the source of raw materials was limited, while butadiene was rich. Therefore, a series of synthetic rubbers were developed based on butadiene. Such as cis-1,4-polybutadiene rubber, styrene butadiene rubber, nitrile rubber and chloroprene rubber. With…

Because rubber plays an important role in industry, agriculture and national defense, it is an important strategic material, which urges countries lacking rubber resources to take the lead in research and development of synthetic rubber.

Raw rubber can be divided into natural rubber and synthetic rubber. 1. Natural rubber: the raw rubber material formed by the process of removing impurities, solidification, smoking, drying, etc. from the rubber trunk cutting mouth to collect the rubber slurry. 2. Synthetic rubber: by product of petrochemical industry, raw rubber with different physical properties is synthesized according to different demands. Commonly used such as: SBR, NBR, EPDM, Br, IIR, Cr, Q, FKM, etc. However, due to different synthesis methods, the same kind of compound can be divided into several different kinds of raw rubber, and through the setting of formula,…