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High temperature storable high viscosity and high elasticity modified asphalt and preparation method thereof

A modified asphalt, storage-resistant technology, applied in the direction of building insulation materials, building components, buildings, etc., can solve the problems of weak van der Waals force, complex production process, and lack of extensive application, and achieve a wide range of sources and easy promotion and application. Effect

Active Publication Date: 2017-06-06
PETROCHINA CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary modified asphalt cannot meet its index requirements, and it is necessary to develop special asphalt binders for its performance
[0003] This special asphalt binder is called high-viscosity and high-elasticity modified asphalt. There are roughly four production methods. The first is to use Japan’s high-viscosity modifier TPS for modification. The obtained modified asphalt has a high viscosity at 60°C. It is widely used in the paving of steel bridge decks due to its characteristics. However, this modifier is expensive, the price is 40,000 yuan/ton, and the addition amount is more than 12%. The comprehensive cost of modified asphalt is about 10,000 yuan/ton. The domestic market price of ordinary SBS modified asphalt is 5000-6000 yuan/ton, so it is difficult to popularize and apply
The second is to be able to replace the expensive TPS modifier. The domestic application is more of a high-content SBS modification method. Although this method can reduce costs, since the SBS addition amount must reach more than 6%, in order to adjust The viscosity should be added with not less than 3% expensive resin, the cost of this modified asphalt is still about 50% higher than that of ordinary SBS modified asphalt, so the possibility of popularization and application is small
The third is waste rubber powder modified asphalt. Compared with the above methods, although the production cost is greatly reduced, the quality control of waste rubber powder modified asphalt is relatively difficult, and most of them are modified on site. Due to the waste rubber powder modified asphalt Viscosity is relatively high, and the difficulty of construction is relatively high
CN103849153A First add waste rubber powder and cut until there are no obvious particles, then add SBS and cut until there are no obvious particles, and finally add a viscosity regulator to obtain a high-viscosity and high-elasticity modified asphalt. The gained high-viscosity and high-elasticity modi

Method used

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  • High temperature storable high viscosity and high elasticity modified asphalt and preparation method thereof
  • High temperature storable high viscosity and high elasticity modified asphalt and preparation method thereof
  • High temperature storable high viscosity and high elasticity modified asphalt and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0042] Example 1

[0043] The high-viscosity and high-elastic modified asphalt is composed of the following components by weight: 100 parts of SK asphalt with a penetration of 100dmm, 8 parts of 40-mesh waste rubber powder, 6 parts of SBS, with a weight average molecular weight of 80,000, 3 parts of EVA , its vinyl acetate content is 15%, melt index is 180g / 10min, 0.5 part of aluminum-zirconium coupling agent, 0.5 part of minus four-line extraction oil, 0.5 part of elemental sulfur, 1.5 part of N-phenyl-β-naphthylamine, high The viscoelastic modified asphalt is prepared according to the following process:

[0044] S1: Mix 4 parts of waste rubber powder, 6 parts of SBS, 3 parts of EVA, 0.5 part of coupling agent, and 0.5 part of compatibilizer to prepare a blend of waste rubber powder / SBS / EVA in an internal mixer. Pelletizing to obtain waste rubber powder / SBS / EVA blended pellets.

[0045] S2: heat 100 parts of base asphalt to a flowing state, heat up to 190°C, turn on the hig...

Example Embodiment

[0048] Example 2

[0049] The high-viscosity and high-elastic modified asphalt is composed of the following components: 100 parts of Esso asphalt, whose penetration is 97dmm, 9 parts of 50-mesh waste rubber powder, 5.5 parts of SBS, whose weight average molecular weight is 88,000, 2.5 parts of EVA, its Vinyl acetate content of 30%, melt index of 120g / 10min, 1 part of aluminum-titanium composite coupling agent, 0.5 part of catalytic cracking slurry extraction oil, 0.5 part of phosphoric acid, 1.0 part of 2,2,4-trimethyl-1,2 - Dihydroquinoline.

[0050] The difference between the preparation process and steps of high-viscosity and high-elasticity modified asphalt and Example 1 is that the amount of waste rubber powder used in step S1 is 4 parts, the shear rate in step S2 is 5000r / min, the shearing temperature is 180°C, and the shearing temperature is 180°C. For 50 minutes, in step S3, blend A is heated to 190° C., and the reaction is stirred for 120 minutes. , and its properti...

Example Embodiment

[0051] Example 3

[0052] The high-viscosity and high-elasticity modified asphalt is composed of the following components: 100 parts of Liaohe asphalt, whose penetration is 93dmm, 10 parts of 60-mesh waste rubber powder, 5 parts of SBS, whose weight average molecular weight is 91,000, 2.5 parts of EVA, its acetic acid Ethylene content is 28%, melt index is 130g / 10min, 0.5 part of aluminum-zirconium coupling agent, 1 part of aluminum-titanium composite coupling agent, 1 part of coking wax oil extraction oil, 0.5 part of polyphosphoric acid, 0.5 part of 6-ethoxy base-2,2,4-trimethyl-1,2-dihydroquinoline.

[0053] The difference between the preparation process and steps of high-viscosity and high-elasticity modified asphalt and Example 1 is that the amount of waste rubber powder used in step S1 is 5 parts, the shear rate in step S2 is 5500r / min, the shearing temperature is 185 ° C, and the shearing temperature is 185 °C. For 50 minutes, in step S3, blend A is heated to 190° C., ...

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Abstract

The invention discloses a method for preparation of modified asphalt with SBS and waste rubber powder as the modifier. The method adopts a physics and chemistry combined technology, uses a coupling agent to conduct chemical treatment on the modifier surface, so that a coupling effect can be generated between SBS and waste rubber powder, under a synergistic effect of EVA, extrusion molding granulation is carried out to obtain waste rubber powder/SBS/EVA blend particles. The blend particles are added into asphalt, shearing dispersion is performed, under a synergistic effect of a cross-linking agent and an antiaging agent, the modified asphalt with excellent high-and-low temperature performance, aging resistance, high elastic recovery, high 60DEG C dynamic viscosity and high temperature storage performance can be obtained. The modified asphalt product is applicable to drainage road pavements, steel bridge deck paving and old pavement reconstruction stress absorbing layers. The raw materials used by the method have wide sources, can be produced on existing SBS modified asphalt devices, and new equipment investment is unnecessary. Therefore, the modified asphalt is suitable for industrialized production and long distance transport.

Description

technical field [0001] The invention relates to road modified asphalt and a preparation method thereof, which is a high-temperature storage-resistant high-viscosity and high-elasticity modified asphalt and a preparation method thereof. Background technique [0002] By the end of the 12th Five-Year Plan, my country's road network has been basically formed, and the built expressways and urban roads will enter the maintenance period one after another. Road reconstruction means, 90% of highways in my country are semi-rigid base pavement, cracking is one of the main diseases of semi-rigid base pavement, and it is generally believed that cracking is caused by reflective cracks. Practice has proved that laying a stress-absorbing layer between the road surface and the old pavement can absorb and disperse stress and prevent cracks from reflecting to the surface. life. The stress-absorbing layer has special functions such as waterproof bonding and delaying the generation of reflectiv...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L21/00C08L53/02C08L23/08C08L91/00
Inventor 毛三鹏熊良铨蔺习雄张艳莉杨克红
Owner PETROCHINA CO LTD
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