A kind of preparation method of microalgae oil modified rubber asphalt

Abstract

The invention discloses a preparation method for microalgal oil-modified rubber asphalt. The microalgal oil-modified rubber asphalt is prepared from matrix asphalt, rubber powder, microalgal oil and acracking agent. The preparation method comprises the following steps: heating the matrix asphalt to 160-170 DEG C at first, then slowly adding the rubber powder and the cracking agent into the matrixasphalt, carrying out shearing and stirring at a temperature of 180-185 DEG C and a high speed of 3500-4000 r / min for 60-90 min, and then carrying out stirring and development at a temperature of 160-170 DEG C and a low speed of 500-1000 r / min for 40-60 min so as to obtain rubber powder-modified asphalt; and preheating the microalgal oil to 160-170 DEG C, preheating the rubber-powder modified asphalt to 160-170 DEG C, then slowly adding the microalgal oil into the rubber powder-modified asphalt, and carrying out shearing and stirring at a temperature of 160-170 DEG C and a high speed of 3500-4000 r / min for 10-30 min so as to obtain the finished microalgal oil-modified rubber asphalt. According to the invention, the microalgal oil is used for modifying the rubber asphalt, the rock asphaltcomponent of the microalgal oil can significantly improve the high temperature performance of desulfurized rubber asphalt, and the rest low-viscosity components of the microalgal oil can improve the problem of too high viscosity of desulfurized rubber asphalt.

Description

technical field

[0001] The invention relates to auxiliary materials for road engineering construction, in particular to a preparation method of microalgae oil modified rubber asphalt. Background technique

[0002] Rubber asphalt is used as an auxiliary material in road construction, mainly blended with gravel aggregates to form rubber asphalt mixture, and then paved with rubber asphalt concrete pavement. Under normal circumstances, rubber asphalt is suitable for use in areas and road sections with high temperature, large traffic volume and other high requirements on road surface performance.

[0003] Rubber asphalt can turn waste tires into treasures and reduce the harm of waste tires to the natural environment. Therefore, making full use of rubber asphalt is of great significance to road construction and environmental protection. Due to the disadvantages of poor compatibility and high viscosity of ordinary rubber asphalt, it is easy to segregate during storage and has the ...

Examples

Embodiment 1

[0022] Example 1 Preparation of rubber powder modified asphalt as a comparative example

[0023] Heat 100 parts of base asphalt to 160~170°C, then slowly add 20 parts of rubber powder and 0.4 parts of cracking agent (using octyl phosphate) into the base asphalt, and shear at 3500~4000r / min at 180~185°C Cutting and stirring for 70 minutes, and then developing at a low speed of 500-1000 r / min at 160-170 °C for 50 minutes to obtain rubber powder modified asphalt.

Embodiment 2

[0024] Example 2 Preparation of 1# microalgae oil modified rubber asphalt

[0025] 1. First extract microalgae oil

[0026] In the first step, use 0.7~0.8mW / cm 2 UV exposure concentration 10 4 ~10 5 Individual / mL microalgae liquid 5h, add Bacillus, make Bacillus concentration reach 10 6 ~10 7 cfu / mL, placed at room temperature for 22 hours to fully degrade the microalgae by bacteria;

[0027] The second step: using a centrifugal filter to separate the water-soluble protein in the microalgae liquid obtained in the first step to obtain a microalgae residue solution;

[0028] The third step: put the microalgae residue solution in the second step in an oven at 100°C until the water is completely evaporated to obtain the microalgae residue;

[0029] Step 4: Add n-hexane to the microalgae residue, stir for 1.5 hours, let it stand for 22 hours, and then filter out the insoluble matter in the solution to obtain a n-hexane solution containing microalgae oil;

[0030] The fifth s...

Embodiment 3

[0033] Example 3 Preparation of 2# microalgae oil modified rubber asphalt

[0034] The method for extracting microalgae oil is the same as in Example 2.

[0035] The method for preparing 2# microalgae oil modified rubber asphalt is as follows: take 100 parts of rubber powder modified asphalt prepared in Example 1 and 30 parts of microalgae oil and preheat them to 160~170°C respectively, and then slowly add microalgae oil into Mix rubber powder modified asphalt at 160-170°C with high-speed shear of 3500-4000r / min for 20 minutes to obtain 2# microalgae oil modified rubber asphalt product.

technical field

[0001] The invention relates to auxiliary materials for road engineering construction, in particular to a preparation method of microalgae oil modified rubber asphalt. Background technique

[0002] Rubber asphalt is used as an auxiliary material in road construction, mainly blended with gravel aggregates to form rubber asphalt mixture, and then paved with rubber asphalt concrete pavement. Under normal circumstances, rubber asphalt is suitable for use in areas and road sections with high temperature, large traffic volume and other high requirements on road surface performance.

[0003] Rubber asphalt can turn waste tires into treasures and reduce the harm of waste tires to the natural environment. Therefore, making full use of rubber asphalt is of great significance to road construction and environmental protection. Due to the disadvantages of poor compatibility and high viscosity of ordinary rubber asphalt, it is easy to segregate during storage and has the ...

Examples

Embodiment 1

[0022] Example 1 Preparation of rubber powder modified asphalt as a comparative example

[0023] Heat 100 parts of base asphalt to 160~170°C, then slowly add 20 parts of rubber powder and 0.4 parts of cracking agent (using octyl phosphate) into the base asphalt, and shear at 3500~4000r / min at 180~185°C Cutting and stirring for 70 minutes, and then developing at a low speed of 500-1000 r / min at 160-170 °C for 50 minutes to obtain rubber powder modified asphalt.

Embodiment 2

[0024] Example 2 Preparation of 1# microalgae oil modified rubber asphalt

[0025] 1. First extract microalgae oil

[0026] In the first step, use 0.7~0.8mW / cm 2 UV exposure concentration 10 4 ~10 5 Individual / mL microalgae liquid 5h, add Bacillus, make Bacillus concentration reach 10 6 ~10 7 cfu / mL, placed at room temperature for 22 hours to fully degrade the microalgae by bacteria;

[0027] The second step: using a centrifugal filter to separate the water-soluble protein in the microalgae liquid obtained in the first step to obtain a microalgae residue solution;

[0028] The third step: put the microalgae residue solution in the second step in an oven at 100°C until the water is completely evaporated to obtain the microalgae residue;

[0029] Step 4: Add n-hexane to the microalgae residue, stir for 1.5 hours, let it stand for 22 hours, and then filter out the insoluble matter in the solution to obtain a n-hexane solution containing microalgae oil;

[0030] The fifth s...

Embodiment 3

[0033] Example 3 Preparation of 2# microalgae oil modified rubber asphalt

[0034] The method for extracting microalgae oil is the same as in Example 2.

[0035] The method for preparing 2# microalgae oil modified rubber asphalt is as follows: take 100 parts of rubber powder modified asphalt prepared in Example 1 and 30 parts of microalgae oil and preheat them to 160~170°C respectively, and then slowly add microalgae oil into Mix rubber powder modified asphalt at 160-170°C with high-speed shear of 3500-4000r / min for 20 minutes to obtain 2# microalgae oil modified rubber asphalt product.

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