[Waste Rubber Tyre Recycling Machine] Progress in the recycling and utilization of waste rubber

Coarse crushing and fine crushing are carried out at the same time: one of the two rollers for this operation has grooves on the surface, and the other has no grooves on the surface, which is a grooved roller machine. First, the washed rubber block is sent to the two rollers through the conveyor belt to break the rubber, and then the crushed rubber block and rubber powder are dropped into the reciprocating screen at the bottom of the equipment and sieved, and the particles that meet the particle size requirements fall from the screen. Enter the warehouse through the conveyor; the rubber blocks that do not meet the requirements are turned over and then enter the grooved roller machine to continue crushing.

 

Coarse crushing and fine crushing are carried out on two equipment: coarse crushing is performed on a grooved roller machine with grooves on the surfaces of two rollers. The size of the coarsely crushed rubber block is generally 6-8mm. Then enter the smooth roller crusher for fine crushing, and its particle size is generally 0.8-1.0mm (26-32 mesh). The crushing equipment of the rubber powder factory is different from the traditional reclaimed rubber crushing equipment. They are all dedicated waste rubber crushers, middle crushers, and fine crushers.

 

The application of rubber powder: The application of rubber powder can be summarized into two major areas: one is directly formed or used with new rubber to make products. For example, when 10 parts of FRP are added to tire tread rubber, its physical properties will not change much. , But can reduce the cost of tread rubber. The wheel belongs to the category of the rubber industry; the second is the application in a wide range of non-rubber industries. Now more and more manufacturers around the world use rubber powder to replace virgin materials, which is not only beneficial to environmental protection, but more importantly because the use of rubber powder can effectively reduce costs, improve performance, and obtain effects that other materials cannot obtain. It can be widely used as rubber, filler and composite materials in tires, hoses, tapes, rubber shoes, rubber industrial products, wires, cables, and building materials, the fineness (90-120 mesh) and dosage of waste tire rubber powder For the impact on the compressive strength of cement mortar, it is found that when the amount of rubber powder is less than 10%, it has almost no effect on the early strength of cement mortar; when the amount is the same, the finer the rubber powder, the higher the strength of the mortar). Rubber powder can also be used with plastics, such as polyethylene, polyvinyl chloride, polypropylene (the commonly used toughening materials for the multi-element toughening modification of polypropylene are polyethylene, ethylene-vinyl acetate copolymer, rubber, and thermoplastic elastomers. And rubber powder, among them, the material modified with rubber powder has the lowest cost. Incorporating a small amount of uFRP can improve the stiffness, hardness, and heat resistance of polypropylene; as a nucleating agent for polypropylene, it improves the impact toughness of polypropylene. ), polyurethane, etc. to improve performance and reduce costs.

 

The use of rubber powder to modify asphalt pavement is also widely used. When fine rubber powder is used to modify the asphalt used for pavement construction, the performance of the modified asphalt and asphalt mixture after the rubber powder is fine is good. Roads paved with rubber powder modified asphalt are used in many developed countries including Canada, the United States, Belgium, France, the Netherlands and other countries. Some provinces and cities in China have entered Jiangxi, Hubei, Guangzhou, Beijing and other places and have successively laid experimental road sections. Practice has proved that roads paved with rubber powder modified asphalt can reduce pavement cracking and softening, the pavement is not easy to freeze and slip, improve driving safety, and can also increase the pavement life, which is at least longer than the service life of ordinary asphalt pavements Doubled.

 

Reclaimed rubber refers to materials that have undergone physical and chemical effects such as pulverization, regeneration, mechanical processing, etc., to make waste rubber products change from their original elastic state to a processed viscoelastic state that can be vulcanized. Reclaimed rubber method Reclaimed rubber production is currently the main method of recycling waste tires in my country. The early reclaimed rubber technology was based on the natural rubber reverse chemical desulfurization process technology. The regeneration (desulfurization) chemical reaction process in production will produce more serious waste gas. The environmental pollution caused by these acid waste gas is expensive and the technology is complicated. Developed countries have stopped producing reclaimed rubber as early as the 1970s and 1980s.