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SBS (styrene-butadiene-styrene) modified asphalt with stable thermal storage and preparation process thereof

A heat storage stable, modified asphalt technology, applied in the direction of building components, building insulation materials, buildings, etc., can solve the problems of high temperature stability of asphalt pavement, reduced high temperature performance of modified asphalt, can not meet the technical requirements and other problems, to achieve Improve the softening point, reduce the penetration, and reduce the effect of adding SBS

Inactive Publication Date: 2012-07-18
SHANDONG HERITAGE HIGHWAY MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of aromatic oil will reduce the viscosity and softening point of asphalt, and increase the penetration, which may not meet the technical requirements of "Technical Specifications for Highway Asphalt Pavement Construction" (JTGF40-2004)
At the same time, the high-temperature performance of modified asphalt is greatly reduced, which makes the asphalt pavement face the threat of rutting and other high-temperature stability diseases

Method used

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  • SBS (styrene-butadiene-styrene) modified asphalt with stable thermal storage and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Preparation of thermal storage stable SBS modified asphalt

[0025] Proceed as follows:

[0026] 1. Take 1000g Qilu No. 70 base asphalt and heat it to 180°C;

[0027] 2. Add 30g of aromatic oil and stir for 1 minute;

[0028] 3. Add 35g of 4303 model SBS and cut for 10 minutes;

[0029] 4. Add 1.2g of sulfur powder and cut for 10 minutes;

[0030] 5. Add 5g of polyphosphoric acid and stir for 2 hours to develop.

Embodiment 2

[0057] Proceed as follows:

[0058] 1. Take 1000g of Binhua No. 70 base asphalt and heat it to 180°C;

[0059] 2. Add 40g of aromatic oil and stir for 1 minute;

[0060] 3. Add 45g of 1301 model SBS and cut for 8 minutes;

[0061] 4. Add 1.5g of sulfur powder and cut for 8 minutes;

[0062] 5. Add 3g of polyphosphoric acid and stir for 140 minutes to develop.

[0063] The above-mentioned stirring speeds are all 60 revolutions / second, and the shearing speeds are all 7000 revolutions / second.

[0064] The experimental test index result of the modified asphalt prepared in embodiment 2 is shown in Table 3:

[0065] Table 3 Modified asphalt test test index list

[0066] indicators

[0067] What embodiment 2 used is the No. 70 base bitumen that penetration is less, and the compatibility with SBS modifier is poor, and SBS modifier uses the linear 1301 type SBS with better compatibility with bitumen, use embodiment 2 SBS modified asphalt segregation and other indicators...

Embodiment 3

[0069] Proceed as follows:

[0070] 1. Take 1000g Korean SK70 base asphalt and heat it to 180℃;

[0071] 2. Add 20g of aromatic oil and stir for 1 minute;

[0072] 3. Add 30g of 4303 model SBS and cut for 12 minutes;

[0073] 4. Add 1.1g of sulfur powder and cut for 12 minutes;

[0074]5. Add 7g of polyphosphoric acid and stir for 2 hours to develop.

[0075] The above-mentioned stirring speeds are all 70 revolutions / second, and the shearing speeds are all 6500 revolutions / second.

[0076] The test index result of the modified asphalt prepared by embodiment 3 is shown in Table 4:

[0077] Table 4 Modified asphalt test test index table

[0078] indicators

[0079] Example 3 uses No. 70 base asphalt with a large penetration and good compatibility with the SBS modifier, and the SBS modified asphalt segregation and other indicators used in Example 3 meet the specification requirements.

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Abstract

The invention discloses an SBS (styrene-butadiene-styrene) modified asphalt with stable thermal storage, which has significantly improved thermal storage stability and has good high-temperature and low-temperature road performance. The SBS modified asphalt is prepared by the step of adding a styrene-butadiene-styrene block copolymer, a stabilizer, a solubilizer and polyphosphate into base asphalt, wherein the weight of the styrene-butadiene-styrene block copolymer is 2-6% of the weight of the base asphalt, the weight of the stabilizer is 0.1-0.2% of the weight of the base asphalt, the weight of the solubilizer is 1-5% of the weight of the base asphalt, and the weight of polyphosphate is 0.1-1% of the weight of the base asphalt. The preparation process of the SBS modified asphalt comprises the following steps: (1) collecting base asphalt, and heating to 175-185 DEG C; (2) adding aromatic oil, and stirring for 40-80 seconds; (3) adding styrene-butadiene-styrene block copolymer, and shearing for 8-12 minutes; (4) adding sulfur powder, and shearing for 8-12 minutes; and (5) adding polyphosphate, and developing under stirring for 100-140 minutes to obtain the SBS modified asphalt with stable thermal storage.

Description

technical field [0001] The invention relates to a heat-storage-stable SBS modified asphalt and a preparation process thereof. Background technique [0002] SBS modified asphalt has become the main variety of modified asphalt in my country because of its good high and low temperature performance, and can improve the anti-aging performance and fatigue resistance of asphalt. However, there are large differences between SBS modifier and asphalt in terms of molecular weight, density and other physical and chemical properties, resulting in poor compatibility between the two. Segregation and stratification often occur during thermal storage of SBS modified asphalt phenomenon, affecting the quality and normal use of modified asphalt. [0003] The storage stability of SBS modified asphalt can be improved by adding stabilizers, such as sulfur and its compounds, which mainly act as cross-linking agents to make SBS cross-link and form a spatial network structure. However, although the...

Claims

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Application Information

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IPC IPC(8): C08L95/00C08L53/02C08K13/02C08K3/32C08K3/06C08K5/01
Inventor 周海防李武
Owner SHANDONG HERITAGE HIGHWAY MATERIALS TECH
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