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Preparation method of highly-elastic self-repairing odorless weather-proof modified asphalt

A modified asphalt, self-healing technology, applied in building components, building insulation materials, construction and other directions, can solve the problems of unstable quality during reuse, difficult combination of asphalt and modifier, human health and environmental threats, etc. The effect of reducing harmful smoke emissions, lowering temperatures, and improving compatibility

Inactive Publication Date: 2020-04-28
江苏宝利路面材料技术有限公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Although the rubber powder modified asphalt prepared by this invention has good stability, its production process is cumbersome and complicated, and it is suitable for large-scale production; at the same time, the reaction temperature is relatively high at 150°C to 200°C, and harmful gases are easily generated. However, the corresponding environmental protection treatment method is not mentioned in this invention, and the rubber powder modified asphalt produced by this invention will cause environmental pollution
[0004] Although rubber asphalt has many advantages, due to the use of waste rubber in the preparation of rubber asphalt, a large amount of dithiol and disulfide will be produced in the process of recycling waste rubber to make reclaimed rubber powder, which has a pungent taste and, It poses a serious threat to human health and the environment; at the same time, the quality of waste rubber is unstable when it is made into reclaimed rubber for reuse, and it is not easy to combine asphalt and modifiers
The existing road modified asphalt is mainly SBS modified asphalt. However, on the one hand, the price of SBS is relatively high and the cost is high. On the other hand, if the content of SBS added is too high, the modified asphalt is prone to poor low temperature performance. Therefore, people have always hoped to find a low-cost, high-performance high-viscosity asphalt modified material

Method used

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  • Preparation method of highly-elastic self-repairing odorless weather-proof modified asphalt

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preparation example Construction

[0029] A method for preparing high-elastic self-repairing, odor-cleaning and weather-resistant modified asphalt, including three steps: preparation of reclaimed rubber particles, preparation of reclaimed rubber mother liquor, and co-crosslinking development of reclaimed rubber mother liquor and SBS, specifically:

[0030] Step 1: Preparation of regenerated rubber granules: desulfurize the tire rubber powder through twin-screw extrusion, and then shear and granulate to obtain regenerated rubber granules;

[0031] Step 2: Preparation of reclaimed rubber mother liquor: Mix the reclaimed rubber particles and base asphalt obtained in step 1 in a mass ratio of 34 / 66 to 68 / 32, and let the regenerated rubber particles soak and develop in the base asphalt at a temperature of 163 to 173°C 0.8 to 1.6 hours, and then cut in high-speed shearing equipment for 20 to 30 minutes to make the rubber powder micro-nano dispersed, and obtain the reclaimed rubber mother liquor;

[0032] Step 3: Co-c...

Embodiment 1

[0045] (1) Mix 40 parts by mass of regenerated rubber particles and 60 parts by mass of AH70# base asphalt in a pre-development tank, and swell and develop for 1 hour at a temperature of 165°C.

[0046] (2) High-speed shearing of the mixture in step (1) for 20 min by a high-speed shearing machine to obtain a reclaimed rubber mother liquor.

[0047] (3) The reclaimed rubber mother liquor obtained in step (2) and the SBS modifier are mixed in a mass ratio of 96 / 4, and the SBS modifier is a star-shaped SBS (mass average molecular weight is 300,000) purchased from Yueyang Petrochemical. Shear in the internal mixer for 50min, the shear rate is 3500r / min, and the temperature is controlled at 170°C.

[0048] (4) Add 0.5%wt (based on the total mass of the product) of sulfur-based cross-linking stabilizer as a co-cross-linking stabilizer, stir for 1.5 hours, and develop through sufficient stirring to prepare a high-elastic self-repairing, clean, and weather-resistant modification Asph...

Embodiment 2

[0050] (1) Mix 45 parts by mass of regenerated rubber particles and 55 parts by mass of AH70# base asphalt in a pre-development tank, and swell and develop for 1 hour at a temperature of 165°C.

[0051] (2) High-speed shearing of the mixture in step (1) for 20 min by a high-speed shearing machine to obtain a reclaimed rubber mother liquor.

[0052] (3) The reclaimed rubber mother liquor obtained in step (2) and the SBS modifier are mixed in a mass ratio of 96 / 4, and the SBS modifier is a star-shaped SBS (mass average molecular weight is 300,000) purchased from Yueyang Petrochemical. Shear in the internal mixer for 50min, the shear rate is 3500r / min, and the temperature is controlled at 170°C.

[0053] (4) Add 0.6%wt (based on the total mass of the product) epoxy rubber cross-linking stabilizer as a co-cross-linking stabilizer, stir for 2 hours, and prepare a kind of high-elastic self-repairing net odor after fully stirring and developing Weather-resistant modified asphalt, No...

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Abstract

The invention discloses a preparation method of highly-elastic self-repairing odorless weather-resistant modified asphalt, which comprises the following three steps: preparation of reclaimed rubber particles, preparation of reclaimed rubber mother liquor and SBS co-crosslinking development. The method includes 1) a step of preparing the reclaimed rubber particles, namely a step of desulfurizing tire rubber powder by a double-screw extrusion method, and carrying out shear granulation to obtain the reclaimed rubber particles; 2) a step of preparing the reclaimed rubber mother liquor, namely a step of mixing the reclaimed rubber particles obtained in the step 1 with matrix asphalt according to a mass ratio of 34 / 66 to 68 / 32, enabling the reclaimed rubber particles to be soaked and developed in the matrix asphalt for 0.8-1.6 hours at the temperature of 163-173 DEG C, and then shearing for 20-30 minutes in high-speed shearing equipment to obtain the reclaimed rubber mother liquor; and 3) astep of co-crosslinking development. According to the preparation method disclosed by the invention, the cost can be saved while a large amount of waste tires are consumed, the environmental protection property in the production process is extremely good, and a finished product not only has excellent elasticity, high and low temperature properties, medium temperature fatigue resistance, noise reduction property and ultraviolet aging resistance, but also is higher in hardness and has a self-repairing capability.

Description

technical field [0001] The invention belongs to the field of waste rubber recycling, and in particular relates to a preparation method of high-elastic self-repairing, odor-cleaning and weather-resistant modified asphalt. Background technique [0002] With the sustained and rapid development of my country's economic construction, highway construction has ushered in the fastest growing, largest and most dynamic period in history. However, with the continuous increase of traffic flow, repeated overloading and the emergence of extreme weather, many diseases have appeared on the asphalt pavement in our country under the action of long-term vehicle load and temperature load, seriously affecting the traffic capacity and Driving safety and comfort, shortening the road service cycle. After continuous research by scholars, it is found that adding rubber to asphalt can improve the road performance of asphalt in high temperature stability, water damage resistance, low temperature crack...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L17/00C08L53/02
CPCC08L95/00C08L17/00C08L2205/03C08L2201/08
Inventor 白浩文武精科周文彬张欢陶红陈先华
Owner 江苏宝利路面材料技术有限公司
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