The rubber foam ball production process including the mixing process, vulcanization process, foaming process and other processes also play a decisive role in the quality of rubber foam balls; rubber raw materials and formulations are the basis for determining the quality of rubber products. Glue production of rubber foam balls (Latex reclaimed rubber can also be used together with natural rubber) should be mastered from the choice of reclaimed rubber to formula adjustment; then what should be paid attention to in the production process of latex foam balls?
1. Latex reclaimed rubber foaming ball rubber mixing process
The low viscosity of the latex reclaimed rubber compounded rubber will cause the rubber to flow in the subsequent vulcanization process with the increase of the vulcanization temperature, and adhere to the mold, resulting in excessive foaming and surface defects in the foamed rubber ball. Glue or honeycomb problem; Mooney viscosity is too high, which will lead to hard rubber, too small pores or delamination; research shows that: latex regenerated rubber Mooney viscosity is 20-40, the rubber compound The bubble works best.
Therefore, in the production of rubber foam balls using latex reclaimed rubber, the rubber compound used must be fully masticated and kneaded, thereby reducing the Mooney viscosity and elasticity of the reclaimed rubber, and further improving the plasticity of the latex reclaimed rubber. If the rubber latex ball of latex reclaimed rubber is mixed with natural rubber, it is necessary to carry out 15-20 times of thinning of the natural rubber. In the plasticating and kneading, it is necessary to add the compounding agent which is not easy to disperse in advance; the fluidity of the latex reclaimed rubber is higher than that of the natural rubber. Well, the number of thin passes can be appropriately reduced; after the mixing is completed, the latex reclaimed rubber needs to be parked to improve the degree of foaming of the latex reclaimed rubber. Fully plasticizing the latex reclaimed rubber can improve the cross-linking plasticity and the resistance to break the bubble wall during the smaller foaming process.
2, latex reclaimed rubber foam ball vulcanization process
Latex foam rubber balls are best vulcanized by two-stage vulcanization. The rubber ball holes are finer and tighter, and the tear strength is higher. It avoids problems such as poor mechanical properties, boring, deformation and rough surface. The vulcanization temperature is controlled at 110-120 ° C, the vulcanization time is between 20-30 min, the second vulcanization temperature is about 140-160 ° C (150 ° C is the best for vulcanized rubber quality and production efficiency), and the vulcanization time is 10 -20min; the higher the vulcanization temperature, the shorter the vulcanization time, the higher the production efficiency; the interval between vulcanization and the second vulcanization should not be too long, about 20min; after vulcanization, the vulcanizate needs to be cooled in cold water; When the infrared lamp tube is selected, the center position of the rubber foam ball is more easily heated, and the vulcanization time can be appropriately shortened.
3, latex reclaimed rubber foam ball foaming process
The foaming process and the vulcanization process in the production of latex foam balls are carried out at the same time. The rubber product manufacturers need to adjust the type and amount of the compounding agent in the vulcanization system according to the foaming speed, thereby matching the foaming speed of the latex reclaimed rubber; The simultaneous matching of the process and the vulcanization process is fundamental to ensure uniform foaming of the rubber balls.
When latex rubber is used to produce rubber foam balls, rubber products manufacturers must strictly monitor from raw material selection to formulation design to production processes. For the production process, operators also need to be serious and rigorous in the weighing of compounding agents. When mixing rubber, grasp the timing of adding various compounding agents, and control from each major process to the small steps of the fine branches, to ensure the quality and production efficiency of latex rubber foam balls.