Preparation method of rubber foam beads and rubber foam products

Abstract

The invention provides a rubber foaming bead, which uses rubber as a base material, the base material contains fillers, and the cell diameter of the rubber foaming bead is 0.1-500 μm. The preparation method of the foamed rubber beads is as follows: ① mixing raw rubber, filler, structure control agent and vulcanizing agent to form a rubber compound; The mixed rubber is extruded and pelletized to obtain pre-vulcanized rubber pellets; ③Place the pre-vulcanized rubber pellets in a high-pressure reactor, and feed the fluid as a foaming agent. When the foaming agent reaches After saturation, the pre-vulcanized rubber granules are foamed by the pressure relief method or the heating method to obtain pre-vulcanized rubber foam beads; ④ completely vulcanize the pre-vulcanized rubber foam beads to obtain rubber foam beads. Mix the above-mentioned rubber foam beads and adhesive evenly, add them into a mold, and cure and shape to obtain a rubber foam product.

Description

technical field [0001] The invention belongs to the field of rubber foam materials, and relates to a rubber foam bead and a preparation method thereof, and a method for preparing rubber foam products based on the rubber foam bead. Background technique [0002] Rubber foam material is a porous polymer elastic material formed by rubber foaming. According to the different cell structures, it can be divided into closed-cell, open-cell and mixed-cell rubber foam materials. The rubber foam material combines the characteristics of rubber and foam materials. It not only has excellent characteristics such as high and low temperature resistance, aging resistance, oil resistance, solvent resistance, radiation resistance, and good chemical stability, but also has high flexibility and high ductility. Physical characteristics such as high elasticity, high porosity, good absorption of mechanical shock and shock and high-frequency shock absorption, play an important role in the fields of tr...

AI Technical Summary

Problems solved by technology

CN103923382A discloses a low-melting-point high-bondability foamed polypropylene beads and a preparation method thereof. Petroleum resin and ethylene-acrylic acid copolymer are used as tackifiers and cooling agents, and by adding foaming agents, nucleating agents, etc. The expanded polypropylene beads are obtained by extrusion, and the expanded polypropylene beads are obtained by secondary foaming under the pressure of the kettle. Due to the use of chemical foaming agents, there are additives remaining in the foamed products in this method, which affects the performance of the products and The lack of negative impact on the environment and human body. At the same time, this method needs to add a large amount of water as a heating medium and a foaming agent for secondary foaming. The molding process is complex and requires high equipment.

CN104194030A discloses thermoplastic polyurethane elastomer foaming beads and preparation method thereof, adopts the scheme of twice foaming+curing, although the method adopts supercritical carbon dioxide foaming, avoiding the addition of organic foaming agent, cell size stabilizer or Nucleating agent is used to achieve foaming, but water still needs to be added as a heating medium. After foaming, the surface moisture of the beads needs to be removed and it needs to be matured at room temperature and pressure for more than 48 hours. The molding cycle is too long

[0005] It can be seen from the above that the current bead foaming is mainly aimed at thermoplastics. There is no bead foaming technology for rubber materials, and there is no corresponding rubber foam bead product. It is prepared on the basis of rubber foam beads. The method of rubber foam products has not been reported yet

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