Waste tire regeneration processing technology

Abstract

The present invention discloses a waste tire regeneration processing technology, including the steps of milling, desulfurization regenerating, kneading, refining and molding. The desulfurization regenerating step includes heated and pressurized desulfurization after adding an activator, a softener, a plasticizer and water to rubber powder obtained from the milling step. The raw materials in the desulfurization regenerating step include by weight: 100 parts of rubber powder, 0.1 to 1.2 parts of the activator, 15-20 parts of the softener, 2.3-4 parts of the plasticizer and 9-12 parts of water. The desulfurization temperature is 180 DEG C-199 DEG C, and the desulfurization pressure is 2.8 MPa-3.8 MPa. By optimizing the ratio of the additives, adjusting material reaction temperature and pressure, the technical indicators of the regenerated rubber are improved, production efficiency is improved and the production cost is reduced.

Description

technical field

[0001] The invention belongs to the technical field of regenerated rubber production, in particular to a recycling process for waste tires. Background technique

[0002] The key technology for the recycling of waste tires is how to completely remove the sulfur in the old rubber to restore the elasticity and plasticity of the rubber, so that the reclaimed rubber can be used as raw materials to produce high-grade rubber products such as new tires or belts, and realize the recycling of resources use. The existing tire reclaimed rubber generally adopts the traditional desulfurization process of the water-oil method, that is, after adding a certain amount of additives to the rubber powder, desulfurize in a desulfurization tank with a temperature of 160°C-180°C and a pressure of 1.8MPa-2.0MPa for about 6 hours. , although this method can realize the recycling of old rubber, but the production cycle is long, the energy consumption is high, and the technical index o...

Examples

Embodiment 1

[0014] Wash, crush, magnetically separate and screen old tires to obtain 100kg of rubber powder with a particle size of 40 mesh, add 0.1kg of 420-type activator, 15kg of softener pine tar, 4kg of plasticizer rosin, and 9kg of water. Put it into the desulfurization tank and close it. While stirring at a constant speed, raise the temperature in the tank to 180°C, and the pressure in the tank to 3.8MPa. After maintaining the pressure for 3 hours, discharge the material, and then obtain reclaimed rubber blocks after kneading, refining and molding processes. After testing, the obtained reclaimed rubber has a moisture content of 1.15%, ash content of 9.2%, acetone extract content of 18.6%, tensile strength of 9.8MPa, elongation at break of 405%, and Mooney viscosity of ML100°C (1+ 4) It is 69, and all performance indicators are in line with the provisions of the national standard GB / T13460-2008 for high-grade products.

Embodiment 2

[0016] After cleaning, crushing, magnetic separation and screening of old tires, 100kg of rubber powder with a particle size of 30 meshes was obtained, 1.2kg of 420-type activator, 15kg of softener pine tar, 2.3kg of plasticizer rosin, and 9kg of water were added, and the above materials were simultaneously Put it into a desulfurization tank and close it. While stirring at a constant speed, raise the temperature inside the tank to 199°C, and the pressure inside the tank to 2.8MPa. Keep the pressure for 2 hours before unloading, and then kneading, refining and molding processes to obtain reclaimed rubber. After testing, the moisture content of the obtained reclaimed rubber is 1.1%, the ash content is 9.8%, the acetone extract is 19.8%, the tensile strength is 10.2MPa, the elongation at break is 400%, and the Mooney viscosity is ML100°C (1 +4) is 68, and all performance indicators are in line with the provisions of the national standard GB / T13460-2008 for high-grade products.

Embodiment 3

[0018] After cleaning, crushing, magnetic separation and screening of old tires, 100kg of rubber powder with a particle size of 35 meshes was obtained, 0.1kg of 420-type activator, 20kg of softener pine tar, 2.3kg of plasticizer rosin, and 9kg of water were added. Put it into the desulfurization tank and close it. While stirring at a constant speed, raise the temperature inside the tank to 190°C, and the pressure inside the tank to 3.2MPa. After keeping the pressure for 2.5 hours, discharge the material, and then obtain reclaimed rubber after kneading, refining and molding processes. After testing, the moisture content of the obtained reclaimed rubber is 1.2%, the ash content is 8.6%, the acetone extract is 19%, the tensile strength is 9.9MPa, the elongation at break is 392%, and the Mooney viscosity is ML100°C (1 +4) is 70, and all performance indicators are in line with the provisions of the national standard GB / T13460-2008 for high-grade products.

technical field

[0001] The invention belongs to the technical field of regenerated rubber production, in particular to a recycling process for waste tires. Background technique

[0002] The key technology for the recycling of waste tires is how to completely remove the sulfur in the old rubber to restore the elasticity and plasticity of the rubber, so that the reclaimed rubber can be used as raw materials to produce high-grade rubber products such as new tires or belts, and realize the recycling of resources use. The existing tire reclaimed rubber generally adopts the traditional desulfurization process of the water-oil method, that is, after adding a certain amount of additives to the rubber powder, desulfurize in a desulfurization tank with a temperature of 160°C-180°C and a pressure of 1.8MPa-2.0MPa for about 6 hours. , although this method can realize the recycling of old rubber, but the production cycle is long, the energy consumption is high, and the technical index o...

Examples

Embodiment 1

[0014] Wash, crush, magnetically separate and screen old tires to obtain 100kg of rubber powder with a particle size of 40 mesh, add 0.1kg of 420-type activator, 15kg of softener pine tar, 4kg of plasticizer rosin, and 9kg of water. Put it into the desulfurization tank and close it. While stirring at a constant speed, raise the temperature in the tank to 180°C, and the pressure in the tank to 3.8MPa. After maintaining the pressure for 3 hours, discharge the material, and then obtain reclaimed rubber blocks after kneading, refining and molding processes. After testing, the obtained reclaimed rubber has a moisture content of 1.15%, ash content of 9.2%, acetone extract content of 18.6%, tensile strength of 9.8MPa, elongation at break of 405%, and Mooney viscosity of ML100°C (1+ 4) It is 69, and all performance indicators are in line with the provisions of the national standard GB / T13460-2008 for high-grade products.

Embodiment 2

[0016] After cleaning, crushing, magnetic separation and screening of old tires, 100kg of rubber powder with a particle size of 30 meshes was obtained, 1.2kg of 420-type activator, 15kg of softener pine tar, 2.3kg of plasticizer rosin, and 9kg of water were added, and the above materials were simultaneously Put it into a desulfurization tank and close it. While stirring at a constant speed, raise the temperature inside the tank to 199°C, and the pressure inside the tank to 2.8MPa. Keep the pressure for 2 hours before unloading, and then kneading, refining and molding processes to obtain reclaimed rubber. After testing, the moisture content of the obtained reclaimed rubber is 1.1%, the ash content is 9.8%, the acetone extract is 19.8%, the tensile strength is 10.2MPa, the elongation at break is 400%, and the Mooney viscosity is ML100°C (1 +4) is 68, and all performance indicators are in line with the provisions of the national standard GB / T13460-2008 for high-grade products.

Embodiment 3

[0018] After cleaning, crushing, magnetic separation and screening of old tires, 100kg of rubber powder with a particle size of 35 meshes was obtained, 0.1kg of 420-type activator, 20kg of softener pine tar, 2.3kg of plasticizer rosin, and 9kg of water were added. Put it into the desulfurization tank and close it. While stirring at a constant speed, raise the temperature inside the tank to 190°C, and the pressure inside the tank to 3.2MPa. After keeping the pressure for 2.5 hours, discharge the material, and then obtain reclaimed rubber after kneading, refining and molding processes. After testing, the moisture content of the obtained reclaimed rubber is 1.2%, the ash content is 8.6%, the acetone extract is 19%, the tensile strength is 9.9MPa, the elongation at break is 392%, and the Mooney viscosity is ML100°C (1 +4) is 70, and all performance indicators are in line with the provisions of the national standard GB / T13460-2008 for high-grade products.

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