High-quality regenerated rubber and its production

A recycled rubber, high-quality technology, applied in the field of waste rubber regeneration, can solve the problems of poor quality of recycled rubber, and achieve the effects of long service life, low noise and good environmental protection effect

Inactive Publication Date: 2007-11-21
QINGWEI RUBBER SUQIAN
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AI-Extracted Technical Summary

Problems solved by technology

[0003] Aiming at the disadvantages of existing regenerated rubber such as poor quality, the present invention proposes a high-quality regenerated rub...
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Method used

Embodiment, take back waste tire, break through crusher, cross 40 mesh sieves, magnetic separation removes impurities such as iron wires in waste tires, prepare 100 parts of rubber powder, add 3 parts of No. 450 activators and solid coal tar to soften After mixing 15 parts of rosin tackifier and 3 parts of rosin tackifier, it enters the desulfurization process, and the temperature (about 217°C), pressure (1.8-2MPa) and desulfurization time (2-3 hours) parameters of the traditional dynamic desulfurization process are increased to the temperature The temperature is 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, penetr...
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Abstract

A high-quality regenerated rubber and its production are disclosed. It improves composition and proportion, it adopts high-temperature and pressure desulfurizing method in short time and refining process is added. The tensile strength and breaking extensibility can be increased by 30-60%; it can substitute natural rubber or synthetic rubber and be used as various tyre and raw material of rubber products. It's simple, efficient and smokeless, has excellent abrasive performance, long life, less noise and no refused water discharge.

Application Domain

Plastic recycling

Technology Topic

High pressureTemperature and pressure +7

Image

  • High-quality regenerated rubber and its production

Examples

  • Experimental program(1)

Example Embodiment

[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.

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