Causes of surface discoloration of rubber expansion joints

The fading of the surface of rubber expansion joints is related to the environment of use, as well as to the performance of dyes and the characteristics of raw materials.
The stability of the dyes used in the production of rubber expansion joints determines the degree of color loss of the product. The components of dyes are metal oxides, salts, etc. Such substances have good thermal stability and heat resistance. The key raw materials for the production and manufacture of rubber flexible joints are HDPP and HDPE, and the temperature of injection processing is specified above 170°C. Therefore, the heat-resistant properties of the dye must be taken into account when selecting additives. As some reducing agents will reflect with the dyeing agent, it is the surface physical properties that are destroyed and endanger the surface of the rubber flexible joint.
Rubber expansion joints should avoid sunlight exposure during use, as is the case with all plastic products. Rubber expansion joints subject to strong sunlight, rubber flexible joints in the production process of coloring agent requirements have an indicator; divided into four - eight, in the case of avoiding light using four or five enough, but if the rubber expansion joints in the case of strong outdoor sunlight use, it requires light resistance level to eight, in the injection molding raw materials to add ultraviolet absorbers and other stabilizers, so as to avoid rubber joints in strong light This will avoid the problem of easy fading of rubber joints under strong light.