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Preparation method of desulfurized rubber modified asphalt

A technology of devulcanized rubber and modified asphalt, applied in building components, building insulation materials, buildings, etc., can solve the problems of decreased deformation resistance, poor anti-aging performance, restricting development and application, etc., to improve elasticity and hardness, prevent The effect of thermo-oxidative aging

Active Publication Date: 2022-05-13
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, devulcanized rubber-modified asphalt also has many problems, such as reduced deformation resistance, poor anti-aging performance, and insufficient high-temperature performance, which restrict its development and application.

Method used

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  • Preparation method of desulfurized rubber modified asphalt
  • Preparation method of desulfurized rubber modified asphalt
  • Preparation method of desulfurized rubber modified asphalt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment provides a kind of preparation method of devulcanized rubber modified asphalt, described method comprises the following steps:

[0022] Step S1, select waste tire rubber powder with a particle size of 80 mesh, add lanthanum stearate, activator 480, heavy oil and stearic acid into the waste tire rubber powder, waste tire rubber powder, lanthanum stearate, activator 480, The mass ratio of heavy oil and stearic acid is 1:0.01:0.012:0.1:0.01, stir and mix evenly, and stand at 160°C for 1h.

[0023] In step S2, the mixture obtained in step S1 is melted and extruded in a conical twin-screw extruder, the screw speed is controlled at 80r / min, and the temperatures of the three sections of the barrel are respectively 180°C, 220°C, and 260°C. The extrusion method is to control the extrusion time to 10 minutes, and the extruded product is pelletized to obtain devulcanized rubber particles.

[0024] Step S3, add base asphalt into the reaction tank, heat to 175°C to ...

Embodiment 2

[0026] This embodiment provides a kind of preparation method of devulcanized rubber modified asphalt, described method comprises the following steps:

[0027] Step S1, select waste tire rubber powder with a particle size of 80 mesh, add cerium stearate, activator 480, heavy oil and stearic acid into the waste tire rubber powder, the waste tire rubber powder, lanthanum stearate, activator 480. The mass ratio of heavy oil and stearic acid is 1:0.01:0.012:0.1:0.01, stir and mix evenly, and stand at 155-165°C for 1 hour;

[0028] In step S2, the mixture obtained in step S1 is melted and extruded in a conical twin-screw extruder, the screw speed is controlled at 80r / min, and the temperatures of the three sections of the barrel are respectively 180°C, 220°C, and 260°C. The extrusion method controls the extrusion time within 5-15 minutes, and the extruded product is pelletized to obtain desulfurized rubber particles;

[0029] Step S3, add the base asphalt into the reaction tank, hea...

Embodiment 3

[0031] This embodiment provides a kind of preparation method of devulcanized rubber modified asphalt, described method comprises the following steps:

[0032] Step S1, select waste tire rubber powder with a particle size of 80 mesh, add lanthanum stearate, activator 480, heavy oil and stearic acid into the waste tire rubber powder, the waste tire rubber powder, lanthanum stearate, activator 480. The mass ratio of heavy oil and stearic acid is 1:0.01:0.012:0.1:0.01, stir and mix evenly, and stand at 165°C for 1 hour.

[0033] In step S2, the mixture obtained in step S1 is melted and extruded in a conical twin-screw extruder, the screw speed is controlled at 80r / min, and the temperatures of the three sections of the barrel are respectively 180°C, 220°C, and 260°C. The extrusion method is to control the extrusion time to 15 minutes, and the extruded product is pelletized to obtain devulcanized rubber particles.

[0034] Step S3, add the base asphalt into the reaction tank, heat ...

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Abstract

The invention provides a preparation method of desulfurized rubber modified asphalt, which comprises the following steps: adding rare earth stearate, an activator, heavy oil and stearic acid into waste tire rubber powder, uniformly stirring and mixing, and standing at 155-165 DEG C for 1 hour; carrying out melt extrusion on the mixture in a conical twin-screw extruder, and granulating the extrudate to obtain desulfurized rubber particles; the preparation method comprises the following steps: adding matrix asphalt into a reaction tank, heating to completely melt the matrix asphalt, then adding desulfurized rubber particles, controlling the mass ratio of the desulfurized rubber particles to the matrix asphalt to be (0.2-0.8): 1, stirring at a low speed, then shearing at a high speed to uniformly disperse the desulfurized rubber particles in the matrix asphalt, finally stirring at a low speed, cooling to 165 DEG C, and keeping the constant temperature for 30 minutes to obtain the desulfurized rubber modified asphalt. The desulfurized rubber modified asphalt is obtained. According to the invention, the aging resistance and shear deformation resistance of the modified asphalt can be improved, and the high-temperature stability of the desulfurized rubber asphalt is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of modified asphalt, in particular to a preparation method of devulcanized rubber modified asphalt. Background technique [0002] Waste rubber-modified asphalt is a common modified asphalt, but the compatibility between waste rubber powder and asphalt is poor. There are a large number of rubber particles in rubber-modified asphalt, which makes rubber-modified asphalt have high viscosity, poor fluidity, and dispersion. Many disadvantages such as poor performance and easy segregation affect its application. Using desulfurization process to process waste rubber powder into desulfurized rubber and then modify asphalt can improve the deficiency of rubber-modified asphalt. However, devulcanized rubber-modified asphalt also has many problems, such as reduced deformation resistance, poor anti-aging performance, and insufficient high-temperature performance, which restrict its development and application. Contents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L19/00C08K5/098
CPCC08L95/00C08L2201/08C08L19/003C08K5/098Y02W30/62
Inventor 李军伟张静刘志华
Owner TIANJIN CHENGJIAN UNIV
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