High-quality regenerated rubber and its production

[0015] The technical process of the method of the present invention is given first: waste tires—crushing—screening—magnetic separation—mixing (adding activator and softener)—desulfurization—rough refining—refining—refining—molding—packaging—finished product.

[0016] Example: take back waste tires, crush them with a crusher, pass through a 40-mesh sieve, and remove impurities such as iron wires in waste tires by magnetic separation, prepare 100 parts of rubber powder, add 3 parts of No. 450 activator and 15 parts of solid coal tar softener After mixing 3 parts of rosin tackifier, enter the desulfurization process, and increase the temperature (about 217°C), pressure (1.8-2MPa) and desulfurization time (2-3 hours) parameters of the traditional dynamic desulfurization process to a temperature of 240- 260°C, the pressure is 2.6-3MPa, and the time is reduced to 60-40 minutes. The desulfurization process is to gradually convert the polysulfides of the rubber powder into monosulfides through high temperature and high pressure physical methods, and cut off the crosslinking points of the monosulfides; the chemical method of adding activators and softeners accelerates the desulfurization of waste vulcanized rubber. Infiltration, penetration and diffusion increase the thermo-oxidative degradation speed of sulfur-bonded cross-linking points, and prevent the reverse anti-aging process. Therefore, in the whole desulfurization process, the severing of sulfur bond cross-linking points can be accelerated in a short time without destroying the rubber main chain structure. After the desulfurization process is completed, it enters the rough refining process. When the desulfurized vulcanized rubber is cooled naturally or cooled to 60-80°C with cooling water, it is pressed into a film with a thickness of about 3.5mm by a pressure roller, and then enters the refining process. It is to cut off the macromolecular structure of rubber, knead into a film with a thickness of 0.2-0.3mm, and enter the re-refining process in the next step, and use the counter-roller to press it into a thin film of 0.1-0.5mm, and then press and pack it to the finished product, so as to obtain recovery Regenerated rubber with the nature of original vulcanized rubber.

[0017] In the same way, the present invention changes the ratio of various raw materials for preparing reclaimed rubber within a given range, and adopts the same process steps as above, only by changing the parameters of desulfurization within a given range can also obtain excellent Grade, excellent grade, first grade, qualified high-quality recycled rubber.

[0018] Best embodiment of the present invention:

[0019] Get 100 parts by weight of rubber powder, 4 parts of 450 activator, 20 parts of solid coal tar softener, 3 parts of rosin tackifier, adopt the same process steps as in the embodiment, wherein, the temperature parameter in the desulfurization process is 240 ° C, the working The pressure is 2.6MPa, and the desulfurization time is 50 minutes. Finally, premium-grade high-quality reclaimed rubber can be obtained.

[0020] In summary, the present invention fundamentally solves the problem of reutilization of waste rubber resources.