Rubber as a polymer elastomer material, the application range has been throughout our daily life in all walks of life, sealing rings, tires, mats, basketballs, etc., some of these rubber products are made of natural rubber, some are synthetic by modern scientific and technological means, the production of various products play more and more roles,no material has been found to completely replace rubber, but the rise of recycled rubber to fill the problem of insufficient rubber resources in China. The surface of the recycled rubber products we usually come into contact with has a smooth amount of oil, and the surface is white and gray or like rainbow color (commonly known as frost or spray color), usually spray frost or spray color will not affect the function of the product, but will affect the appearance quality. There are many reasons for the formation of reclaimed rubber surface frost or color, among which the three more common are:
1. The problem of vulcanization. formula matching (a certain ingredient, especially accelerators or vulcanizing agents) causes false saturation vulcanization of recycled rubber. After heating and pressure vulcanization, the molecules are still crosslinking at natural temperature, and after the crosslinking is completed, the excess unreacted substances will precipitate out of the surface, forming a rubber surface to spit frost or spray color.
2. Vulcanization process problems. There are problems in the process in the production of recycled rubber products, and the positive vulcanization formula will also occur after the process change, such as the vulcanization time is too short, and the temperature setting is too high to cause false vulcanization.
3. Vulcanization formula matching problem. Sometimes there is a limit value for adding more substances (for example, in many recycled rubber floor mat formulations, the amount of paraffin wax is usually increased to make it spit out of the surface when used later, forming a protective wax substance) The amount of additional addition has a limit value, and exceeding the limit value will also lead to frost or spraying.
Spraying white or color spraying on the surface of rubber products is a problem that may be encountered during the vulcanization process of HYY/E3711 rubber, and this problem may be more prominent in summer. In recent years, there have also been many new products such as anti-spray agents, anti-spray color agents, and insoluble chemical additives on the market, which can also solve the problem of spraying or spraying. If you want to make the surface of vulcanized rubber brighter, there are also the following 3 methods:
1. Choose ultra-fine reclaimed rubber with a fineness of more than 80 mesh. The higher the fineness of recycled rubber, the higher the surface gloss of the vulcanized rubber product, which is also a fundamental solution to the problem.
2. Surface treatment after vulcanization is completed. The method of short duration is to apply lubricants to the surface, such as silicone oil, fatty acids, etc., which will have residues on the surface of rubber products treated in this way and the cost is extremely low. The long-lasting way is to do surface spraying polyurethane, this treatment requires cleaning and short-term heating of the rubber surface, the surface is smooth and bright, the duration is relatively long, and the cost is slightly higher.
3. Incremental precipitation. Incremental addition of paraffin, plasticizer, etc., will continue to precipitate to the rubber surface after rubber molding, long duration, high surface gloss, the disadvantage is that it will contaminate the packaging, and the general hand wipe will appear, which is not recommended.
The surface of rubber products and the correct storage method are also closely related. First of all, it is necessary to avoid exposing recycled rubber products to sunlight for a long time, so as to avoid aging of their surfaces due to heat and ultraviolet radiation; Secondly, pay attention to avoid contact with chemicals to avoid corrosion or damage to the rubber surface; Finally, choose a dry and ventilated environment for storage to avoid the influence of humidity and high temperature.
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