Asphalt raw material for SBS polymer modified asphalt and modified asphalt

Abstract

The invention relates to the technical field of road materials, in particular to an asphalt raw material for SBS polymer modified asphalt and modified asphalt. The asphalt raw material for the SBS polymer modified asphalt comprises the following components in percentage by mass: 9-16% of saturate; 43%-53% of aromatic component; 22%-28% of colloid; 9%-12% of asphaltene; the penetration of the asphalt raw material for the SBS polymer modified asphalt at 25 DEG C is 63-750.1 mm; the dynamic viscosity at 60 DEG C is less than or equal to 240 Pa.s; the penetration ratio is greater than or equal to 65%; the instability index of the colloid is 0.2-0.4; the weight-average molecular weight of the asphalt raw material for the SBS polymer modified asphalt is 1400 to 2200 g / mol. By optimizing the raw material components of the asphalt, the produced modified asphalt has better high-temperature performance, low-temperature performance, anti-aging performance and storage stability, the production efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of road materials, and in particular to an asphalt raw material for SBS polymer modified asphalt and modified asphalt. Background Art

[0002] The performance of polymer modified asphalt is greatly affected by the base asphalt. The high temperature performance, low temperature performance, anti-aging performance and storage stability of modified asphalt are all determined by the microscopic components of the base asphalt. At present, there are few high-quality base asphalt oil sources that can meet the high temperature performance, low temperature performance, anti-aging performance and storage stability of modified asphalt, resulting in some modified asphalt produced with base asphalt as raw material having poor performance in some aspects.

[0003] At present, manufacturers improve some properties of polymer modified asphalt by adding additives, such as adding modifiers to improve the high temperature performance of polymer modified asphalt. This method increases the production cost of modified asphalt on the one hand, and the compatibility between asphalt and modifiers is poor on the other hand. Anti-aging agents are also added to improve the anti-aging performance of modified asphalt, and functional stabilizers are added to improve the storage stability of polymer modified asphalt. Although the performance of modified asphalt can be improved in some aspects by adding additives, it will lead to uneven quality of modified asphalt and poor road performance.

[0004] In order to fundamentally solve the problem of uneven quality of modified asphalt, it is necessary to optimize the components of modified asphalt raw materials, starting from the modified asphalt raw materials, and thoroughly solve the problem of unstable quality of modified asphalt. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide an asphalt raw material and modified asphalt for SBS polymer modified asphalt, and to improve the comprehensive performance of the modified asphalt by optimizing the asphalt raw material components.

[0006] To achieve the above object, the present invention provides an asphalt raw material for SBS polymer modified asphalt, which comprises, by mass content:

[0007] Saturation score 9%~16%;

[0008] Aroma: 43%~53%;

[0009] Gel 22%~28%;

[0010] Asphaltene 9%~12%;

[0011] The asphalt raw material for the SBS polymer modified asphalt has a needle penetration of 63-75 0.1 mm at 25°C;

[0012] Dynamic viscosity at 60℃ is less than or equal to 240 Pa·s;

[0013] The needle penetration ratio is greater than or equal to 65%;

[0014] The colloid instability index is 0.2-0.4;

[0015] The weight average molecular weight of the asphalt raw material for the SBS polymer modified asphalt is 1400-2200 g / mol.

[0016] The matrix asphalt components include: saturated fraction, aromatic fraction, colloid, and asphaltene. The saturated fraction and aromatic fraction are oil fractions. The oil fraction has a small molecular weight and weak polarity and is a soft component in the asphalt. The colloid and asphaltene have a large molecular weight and are hard components in the asphalt. Asphaltene is the most polar component among the four components. As the radical core of the asphalt colloid, it directly affects various properties of the asphalt. The present invention improves the high temperature performance, low temperature performance, anti-aging performance, and storage stability of the modified asphalt by optimizing the asphalt raw material components.

[0017] Preferably, the asphalt raw material for SBS polymer modified asphalt comprises, by mass content:

[0018] Saturation score 9%~10%;

[0019] Aroma: 52%~53%;

[0020] Gel 25%~26%;

[0021] Asphaltene 9%~10%;

[0022] The asphalt raw material for the SBS polymer modified asphalt has a needle penetration of 70-75 0.1 mm at 25°C;

[0023] The dynamic viscosity at 60°C is 210-220 Pa·s;

[0024] The needle penetration ratio is 65%-75%;

[0025] The colloid instability index is 0.2-0.3;

[0026] The weight average molecular weight of the asphalt raw material for the SBS polymer modified asphalt is 1800-1900 g / mol.

[0027] Further preferably, the asphalt raw material for SBS polymer modified asphalt, measured by mass content, comprises:

[0028] Saturation score 9.4%~9.5%;

[0029] Aroma: 52%~52.5%;

[0030] Gel 25%~25.5%;

[0031] Asphaltene 9.5%~10%;

[0032] The asphalt raw material for the SBS polymer modified asphalt has a needle penetration of 70-72 0.1 mm at 25°C;

[0033] The dynamic viscosity at 60°C is 210-215 Pa·s;

[0034] The needle penetration ratio is 69%-71%;

[0035] The colloid instability index is 0.23-0.28;

[0036] The weight average molecular weight of the asphalt raw material for the SBS polymer modified asphalt is 1850-1900 g / mol.

[0037] In some specific embodiments of the present invention, the asphalt raw material for SBS polymer modified asphalt includes, by mass content:

[0038] Saturation score 9.44%;

[0039] Aroma score 52.29%;

[0040] colloid 25.14%;

[0041] Asphaltene 9.62%;

[0042] The asphalt raw material for the SBS polymer modified asphalt has a needle penetration of 71 0.1 mm at 25°C;

[0043] The dynamic viscosity at 60°C is 212 Pa·s;

[0044] The needle penetration ratio is 70%;

[0045] The colloid instability index is 0.25;

[0046] The weight average molecular weight of the asphalt raw material for the SBS polymer modified asphalt is 1865 g / mol.

[0047] In the present invention, the detection methods of the above-mentioned saturated content, aromatic content, colloid content, asphaltene content, 25°C needle penetration, 60°C dynamic viscosity, needle penetration ratio, and colloid instability index refer to JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures for Highway Engineering", and the asphalt molecular weight is measured by gel permeation chromatography.

[0048] The present invention solves the problem of unstable quality of modified asphalt by limiting the parameters of the above-mentioned asphalt raw materials from the raw material end.

[0049] Based on this, the present invention provides an SBS polymer modified asphalt, which comprises, by weight:

[0050] 100 parts of base asphalt;

[0051] 1.0-3.5 parts of cosolvent;

[0052] 3.8-4.5 parts of polymer modifier;

[0053] Stabilizer 0.15-0.28 parts;

[0054] The base asphalt is the asphalt raw material for the above-mentioned SBS polymer modified asphalt.

[0055] Preferably, the kinematic viscosity of the cosolvent at 100°C is 30-40 mm 2 / s, flash point greater than 210℃, density 0.9-1.1 kg / m 3 .

[0056] Preferably, the co-solvent includes one or more of aromatic oil and furfural extracted oil.

[0057] Preferably, the polymer modifier is a block copolymer of styrene-butadiene-styrene. More preferably, the polymer modifier is a linear block copolymer of styrene-butadiene-styrene. The molecular weight of the polymer modifier is preferably 100,000 to 150,000. In some specific embodiments of the present invention, the polymer modifier is 791H SBS.

[0058] Preferably, the main component of the stabilizer is sulfur.

[0059] The SBS polymer modified asphalt provided by the present invention does not require the addition of additional additives, and can obtain good high temperature performance, low temperature performance, anti-aging performance and storage stability only through raw material optimization. The test results show that by limiting the parameters of the base asphalt, the softening point of the modified asphalt can be increased by 3.5-5.5°C, and the elongation of the residue after the film heating experiment can be increased by 6cm.

[0060] The present invention provides a method for preparing the above-mentioned SBS polymer modified asphalt, comprising the following steps:

[0061] S1. Shear the base asphalt and polymer modifier at 180-185°C for 30-50 minutes;

[0062] S2. Add a solvent and a stabilizer to the sheared asphalt, and develop it at 180-185°C for 70-150 minutes to obtain a modified asphalt product.

[0063] In the step S1, the shearing temperature is preferably 180° C., the shearing time is preferably 30 min, and the shearing speed is preferably 4000 r / min.

[0064] In step S2, the growth temperature is preferably 185° C., and the growth time is preferably 90 minutes.

[0065] Compared with the prior art, the present invention provides an asphalt raw material for SBS polymer modified asphalt, which comprises, by mass content: saturated fraction 9%-16%; aromatic fraction 43%-53%; colloid 22%-28%; asphaltene 9%-12%; the asphalt raw material for SBS polymer modified asphalt has a needle penetration of 63-75 0.1mm at 25°C; a dynamic viscosity of less than or equal to 240 Pa·s at 60°C; a needle penetration ratio of greater than or equal to 65%; a colloid instability index of 0.2-0.4; and a weight average molecular weight of 1400-2200 g / mol for the asphalt raw material for SBS polymer modified asphalt.

[0066] The present invention optimizes the asphalt raw material components and takes the saturated fraction, aromatic fraction, colloid, asphaltene, asphalt weight average molecular weight, 25°C needle penetration, 60°C dynamic viscosity and needle penetration ratio as important bases for selection. The modified asphalt produced has good high temperature performance, low temperature performance, anti-aging performance and storage stability, and the production efficiency is improved and the cost is reduced. Starting from the modified asphalt raw material end, the problem of unstable quality of modified asphalt is solved. DETAILED DESCRIPTION

[0067] In order to further illustrate the present invention, the asphalt raw material for SBS polymer modified asphalt and modified asphalt provided by the present invention are described in detail below in conjunction with the examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the invention.

[0068] All raw materials of the present invention have no particular limitation on their sources, and can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0069] Example 1

[0070] Matrix asphalt 4# (indicators see Table 1), 500g of the asphalt was added with 22g of modifier 791H SBS for shearing, and the temperature was controlled at 180℃ with a direct heating jacket, the speed was 4000 r / min, and the shearing was carried out for 30min. After the shearing was completed, the obtained sample was transferred to a temperature-controlled heating jacket, 7.5g of co-solvent and 1.25g of stabilizer were added, the temperature was controlled at 185℃, and the stirring was carried out for 90min to obtain the modified asphalt product.

[0071] Example 2

[0072] Matrix asphalt 4# (indicators see Table 1), 500g of the asphalt was added with 22g of modifier 791H SBS for shearing, and the temperature was controlled at 180℃ with a direct heating jacket, the speed was 4000 r / min, and the shearing was carried out for 30min. After the shearing was completed, the obtained sample was transferred to a temperature-controlled heating jacket, 16.5g of co-solvent and 1.25g of stabilizer were added, the temperature was controlled at 185℃, and the stirring was carried out for 70min to obtain a modified asphalt product.

[0073] Comparative Example 1

[0074] Matrix asphalt 1# (indicators see Table 1), 500g of the asphalt was added with 22g of modifier 791H SBS for shearing, and the temperature was controlled at 180℃ with a direct heating jacket, the speed was 4000 r / min, and the shearing was carried out for 30min. After the shearing was completed, the obtained sample was transferred to a temperature-controlled heating jacket, 7.5g of co-solvent and 1.25g of stabilizer were added, the temperature was controlled at 185℃, and the stirring was carried out for 90min to obtain a modified asphalt product.

[0075] Comparative Example 2

[0076] Matrix asphalt 2# (indicators see Table 1), 500g of the asphalt was added with 22g of modifier 791H SBS for shearing, and the temperature was controlled at 180℃ with a direct heating jacket, the speed was 4000 r / min, and the shearing was carried out for 30min. After the shearing was completed, the obtained sample was transferred to a temperature-controlled heating jacket, 16.5g of co-solvent and 1.25g of stabilizer were added, the temperature was controlled at 185℃, and the stirring was carried out for 70min to obtain the modified asphalt product.

[0077] Comparative Example 3

[0078] Matrix asphalt 3# (indicators see Table 1), 500g of the asphalt was added with 22g of modifier 791H SBS for shearing, and the temperature was controlled at 180℃ with a direct heating jacket, the speed was 4000 r / min, and the shearing was carried out for 30min. After the shearing was completed, the obtained sample was transferred to a temperature-controlled heating jacket, 14.5g of co-solvent and 1.25g of stabilizer were added, the temperature was controlled at 185℃, and the stirring was carried out for 70min to obtain the modified asphalt product.

[0079] The main component of the above stabilizers is sulfur.

[0080] The matrix asphalt indexes in Examples 1-2 and Comparative Examples 1-3 are shown in Table 1:

[0081] Table 1 Indexes of base asphalt of Examples 1-2 and Comparative Examples 1-3

[0082]

[0083] The results of the modified asphalt prepared in Examples 1-2 and Comparative Examples 1-3 are shown in Table 2:

[0084] Table 2 Modified asphalt indexes of Examples 1-2 and Comparative Examples 1-3

[0085]

[0086] As can be seen from the above table: modified asphalt is prepared using a base asphalt with performance parameters within the scope defined by the present invention. By comparing Example 1 with Comparative Example 1, the softening point is 5.5°C higher, and the ductility of the residue after the film heating experiment is 6cm higher. By comparing Example 2 with Comparative Example 2, the softening point is 3.5°C higher. Under the same development time, the segregation index is smaller, and the ductility of the residue after the film heating experiment is 6cm higher, indicating that without changing the scheme, the modified asphalt has better high temperature performance, low temperature performance, anti-aging performance, and storage stability performance through raw material optimization. Starting from the raw material end solves the problem of unstable quality of modified asphalt and improves the production efficiency of modified asphalt.

[0087] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An asphalt raw material for SBS polymer modified asphalt, characterized in that: In terms of mass content, it includes: Saturation score 9%~16%; Aroma: 43%~53%; Gel 22%~28%; Asphaltene 9%~12%; The asphalt raw material for the SBS polymer modified asphalt has a needle penetration of 63-75 0.1 mm at 25°C; Dynamic viscosity at 60℃ is less than or equal to 240 Pa·s; The needle penetration ratio is greater than or equal to 65%; The colloid instability index is 0.2-0.4; The weight average molecular weight of the asphalt raw material for the SBS polymer modified asphalt is 1400-2200 g / mol.

2. The asphalt raw material for SBS polymer modified asphalt according to claim 1, characterized in that: In terms of mass content, it includes: Saturation score 9%~10%; Aroma: 52%~53%; Gel 25%~26%; Asphaltene 9%~10%; The asphalt raw material for the SBS polymer modified asphalt has a needle penetration of 70-75 0.1 mm at 25°C; The dynamic viscosity at 60°C is 210-220 Pa·s; The needle penetration ratio is 65%-75%; The colloid instability index is 0.2-0.3; The weight average molecular weight of the asphalt raw material for the SBS polymer modified asphalt is 1800-1900 g / mol.

3. The asphalt raw material for SBS polymer modified asphalt according to claim 2, characterized in that: In terms of mass content, it includes: Saturation score 9.4%~9.5%; Aroma: 52%~52.5%; Gel 25%~25.5%; Asphaltene 9.5%~10%; The asphalt raw material for the SBS polymer modified asphalt has a needle penetration of 70-72 0.1 mm at 25°C; The dynamic viscosity at 60°C is 210-215 Pa·s; The needle penetration ratio is 69%-71%; The colloid instability index is 0.23-0.28; The weight average molecular weight of the asphalt raw material for the SBS polymer modified asphalt is 1850-1900 g / mol.

4. A SBS polymer modified asphalt, comprising, by weight: 100 parts of base asphalt; 1.0-3.5 parts of cosolvent; 3.8-4.5 parts of polymer modifier; Stabilizer 0.15-0.28 parts; The base asphalt is the asphalt raw material for SBS polymer modified asphalt as described in any one of claims 1 to 3.

5. The SBS polymer modified asphalt according to claim 4, characterized in that: The kinematic viscosity of the cosolvent at 100°C is 30-40 mm 2 / s, flash point greater than 210℃, density 0.9-1.1 kg / m 3 .

6. The SBS polymer modified asphalt according to claim 5, characterized in that: The co-solvent includes one or more of aromatic oil and furfural extracted oil.

7. The SBS polymer modified asphalt according to claim 4, characterized in that: The polymer modifier is a block copolymer of styrene-butadiene-styrene.

8. The SBS polymer modified asphalt according to claim 4, characterized in that: The stabilizer includes sulfur.

9. The method for preparing the SBS polymer modified asphalt according to any one of claims 4 to 8, comprising the following steps: S1. Shear the base asphalt and polymer modifier at 180-185°C for 30-50 minutes; S2. Add a solvent and a stabilizer to the sheared asphalt, and develop it at 180-185°C for 70-150 minutes to obtain a modified asphalt product.

10. The preparation method according to claim 9, characterized in that: In the step S1, the shearing temperature is 180°C, the shearing time is 30 minutes, and the shearing speed is 4000 r / min; In step S2, the development temperature is 185° C. and the development time is 90 minutes.

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