SBS (Styrene Butadiene Styrene) aggregate capable of being quickly melted and dispersed in hot asphalt and application of SBS aggregate

Abstract

The invention discloses modified SBS (styrene-butadiene-styrene) granules capable of being quickly melted and dispersed in hot asphalt and application of the modified SBS granules. The granules are prepared from the following raw materials in parts by weight: 40-50 parts of SBS, 45-57 parts of a softening agent and 3-8 parts of an additive through screw granulation. The preparation raw materials of the SBS aggregate are easy to obtain, the types of additives are few, the SBS aggregate can be used for preparing modified asphalt through reasonable selection and matching of the raw materials, the SBS aggregate can be directly added into hot asphalt to be conventionally stirred, and the performance of the obtained modified asphalt is better.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of SBS modified asphalt preparation, and relates to an SBS granule for rapid melting and dispersion in hot asphalt and application thereof. BACKGROUND

[0002] Road asphalt modification is usually to heat 70# petroleum asphalt to about 180 DEG C in an asphalt mixing tank, then add a certain proportion (usually 3.8-4.5% according to road performance) of SBS, pre-mix for 1-2 hours, then grind the mixture into modified asphalt by a colloid mill, and add a sulfur stabilizer to develop for 3-4 hours to prevent SBS segregation during storage and transportation. The whole modified asphalt process is long in time, high in energy consumption, large in emission, and heavy in environmental pollution. In order to save energy and reduce emissions, technical elites in the industry are trying new methods of modifying road asphalt, such as using a dry method of directly injecting SBS modified asphalt during road construction.

[0003] Patent CN 114163830 A discloses a directly-injected rapid-melting asphalt modifier and a preparation method thereof, wherein the prepared rapid-melting asphalt modifier includes a sol phase and a skeleton phase, the sol phase contains a viscoelastic modifier, a soft segment detangling agent, a hard segment detangling agent, an interface diffusion agent and a solvent, and the skeleton phase is a semi-crystalline polymer, and the melting time of the semi-crystalline polymer in hot stone is 90 seconds; patent CN 111138794 A discloses a granulation-free dry method SBS modifier, a preparation method and application thereof, wherein SBS is physically crushed to obtain a powder with a particle size of less than 2000 microns, and less than 10% of a crosslinking agent and less than 3% of a crosslinking aid are added, and a small amount of filling oil and less than 2% of water are also added, and the melting time of the SBS in hot stone is only about 3 seconds. The prior art mainly aims at SBS dry modified asphalt road construction, and cannot achieve the effect of rapid melting and dispersion of SBS in hot asphalt in wet modified asphalt, and the manufacturing process is complicated, the types of additives are many, the cost is high, and the market acceptance is low. For wet modified asphalt, there is no related literature and patent about rapid melting and dispersion of SBS in hot asphalt and performance of modified asphalt. SUMMARY

[0004] In view of the deficiencies in the prior art, a first object of the present application is to provide an SBS granule for rapid melting and dispersion in hot asphalt, which is easy to prepare, has few types of additives, and can be used for preparation of modified asphalt by reasonable selection and collocation of raw materials, so as to optimize the elastic recovery capacity of asphalt material and improve its stability under temperature change and load action.

[0005] The second object of the present application is to provide an application of the SBS granules which can be quickly molten and dispersed in hot asphalt, and the application is used in the preparation of modified asphalt or in the preparation of modified asphalt mixture for road construction, and the preparation of modified asphalt has the characteristics of short time, low energy consumption, less emissions, and environmental friendliness, and the modified granules can be directly added to hot asphalt for conventional stirring, and the performance of the obtained modified asphalt is better.

[0006] In order to achieve the above technical purposes, the present application provides a kind of SBS granules which can be quickly molten and dispersed in hot asphalt, which is obtained by screw granulation from raw materials including the following weight parts: SBS 40-50 parts, softening agent 45-57 parts and additive 3-8 parts;The block ratio of SBS is (20-35) :(65-80).

[0007] In the process of modified asphalt, SBS as a key modifier, mainly provides elasticity and toughness, the SBS granules of the present application can significantly improve the high temperature stability, low temperature crack resistance and durability of asphalt by forming a continuous network structure in asphalt.The main role of the softening agent is to promote the quick melting and dispersion of SBS in hot asphalt, while reducing the viscosity of asphalt, improving the fluidity and workability.The main role of the additive is to improve the softening point of the modified asphalt, and also promote the melting and dispersion of SBS in hot asphalt, and enhance the adhesion.The synergistic effect of these raw materials ensures that the prepared SBS asphalt modified granules can be quickly molten and dispersed in hot asphalt, and also improves the comprehensive performance of asphalt.

[0008] In the present application, SBS should have a suitable block ratio (S / B), and the block styrene can increase the hardness and strength of the material, and the block butadiene can give the material better softness and elasticity.In addition, the selection of molecular weight is also very important.By controlling the block ratio and molecular weight of SBS, the performance of asphalt modified granules can be targetedly optimized to ensure that it meets the performance requirements, and also ensures that the SBS granules show the effect of quick melting and dispersion in hot asphalt.If the block ratio is too high and the molecular weight is too large, it is difficult to ensure the quick melting of SBS granules, and if the block ratio is too low and the molecular weight is too small, the performance of the modified asphalt is poor, and the softening point and ductility indicators do not meet the use requirements.Further preferably, the block ratio is (28-33) :(67-72).

[0009] As a preferred scheme, the SBS is linear SBS with a molecular weight of 80-150 thousand and / or star-shaped SBS with a molecular weight of 140-280 thousand;Further preferably, the SBS is linear SBS with a molecular weight of 100-130 thousand and / or star-shaped SBS with a molecular weight of 230-250 thousand.

[0010] Further, the SBS is selected from Hunan petrochemical company product line type structure SBS791H (block ratio 30 / 70, molecular weight 115,000) and other similar technical parameters of the basic similar other brands.

[0011] As a preferred solution, the SBS granules are obtained by screw granulation from the following raw materials by weight: SBS 44-48 parts, softening agent 48-52 parts and additives 3-7 parts.

[0012] As a preferred solution, the softening agent includes at least one of naphthenic oil, aromatic oil, refinery cut three, four-line oil, dibutyl ester dioctyl ester and liquid paraffin. Further preferably, the softening agent is selected from naphthenic oil and / or aromatic oil, wherein the naphthenic oil is preferably 4006 or 4010, and the aromatic oil is preferably a commercially available product with a viscosity less than 35 pa.s, an aniline point not less than 30, and a flash point not less than 210°C.

[0013] As a preferred solution, the additive is at least one of petroleum resin, PE wax, PP wax, PE, PP, EVA and rubber powder. Further preferably, the additive is at least one of PE wax, PP wax and C9 petroleum resin.

[0014] As a preferred solution, the raw materials further include a release agent; the release agent is at least one of calcium stearate powder, white carbon black and talc powder. The product form of the present application is a bagged SBS granule, and a small amount of release agent needs to be added to the surface of the granule to extend the storage time and facilitate transportation.

[0015] As a preferred solution, the amount of the release agent is 0.2-0.5wt%.

[0016] As a preferred solution, the screw granulation uses a double-screw granulator, and underwater cutting or water ring cutting can be used.

[0017] As a preferred solution, the screw granulation conditions are: granulation temperature is 150-180°C, and die head temperature is 60-80°C.

[0018] The present application finally provides an application of the SBS granule which is rapidly melted and dispersed in hot asphalt, which is applied to the preparation of modified asphalt or to the preparation of modified asphalt mixture for road construction.

[0019] As a preferred solution, when applied to the preparation of modified asphalt, the SBS granule is added to asphalt at 160-170°C at 8-11wt% of the total mass of the mixture, and stirred for 10-30min.

[0020] As a preferred scheme, the SBS granules are added into hot stone at 190-210 DEG C for stirring at 0.5-0.8 wt% of the total mass of the mixture.

[0021] Compared with the prior art, the application has the following beneficial effects:

[0022] 1) The SBS granules provided by the application are used for modifying asphalt, and only need to be added into hot asphalt at 160-170 DEG C for conventional stirring for 10-30 min at normal temperature to obtain modified asphalt with excellent performance, which greatly shortens the production time, saves energy and reduces emissions, and is of great significance. Moreover, the elastic recovery capacity of the asphalt material can be optimized, and the stability under temperature change and load action can be improved.

[0023] 2) The asphalt modification granule preparation process is simple, raw materials are easy to obtain, and the types of additives are few.

[0024] 3) The SBS granules used for modifying asphalt can greatly improve the ductility of the asphalt, and the performance indicators of the obtained modified asphalt mixture meet the standard requirements. DETAILED DESCRIPTION

[0025] The application will be further described below in combination with specific examples, but the protection scope of the application is not limited to the following specific examples. Obviously, the following described examples are only a part of examples, and all other examples obtained by the person skilled in the art without making creative efforts still belong to the protection scope of the application.

[0026] Unless otherwise specified, various raw materials, reagents, instruments and equipment and the like used in the application can be purchased from the market or can be prepared by the existing method.

[0027] Example 1

[0028] 45 parts of SBS 791H (linear structure, block ratio 30 / 70, molecular weight about 115,000, produced by Hunan Petrochemical), 49 parts of aromatic oil (LN-24, aniline point 35), 5 parts of PP wax and 1 part of rubber powder are weighed by weight parts, mixed and then granulated by a double-screw granulator, the highest temperature during granulation is controlled to be 160 DEG C, and the film head temperature is controlled to be 65 DEG C. The underwater cutting is used, and 0.3 wt% of calcium stearate powder is added and uniformly mixed to obtain the SBS granules.

[0029] The obtained SBS granules were used for asphalt modification application, and the specific operation was as follows: 70# petroleum asphalt was heated to 170℃, and 10wt% SBS granules (equivalent to 4.5wt% SBS) were added, and stirred for 20min. The modified asphalt was obtained, and performance test was carried out, and the test results were as follows:

[0030] The softening point was 80℃, the 5℃ ductility was 48cm, and the penetration was 50 (0.1mm).

[0031] Example 2

[0032] The implementation conditions of this example were the same as those of example 1, except that the aromatic oil in example 1 was replaced with an equal amount of naphthenic oil (KN-4010), and the modified asphalt conditions were unchanged.

[0033] The performance of the modified asphalt was as follows:

[0034] The softening point was 80.5℃, the 5℃ ductility was 45cm, and the penetration was 48 (0.1mm).

[0035] Example 3

[0036] The implementation conditions of this example were the same as those of example 1, except that the PP wax in example 1 was replaced with an equal amount of PE, the aromatic oil content was 50 parts, and there was no rubber powder, and the modified asphalt conditions were unchanged.

[0037] The performance of the modified asphalt was as follows:

[0038] The softening point was 79℃, the 5℃ ductility was 55cm, and the penetration was 48 (0.1mm).

[0039] Example 4

[0040] The preparation method of this example was the same as that of example 1, except that the composition of the asphalt modification granules was as follows: SBS791H 50 parts, aromatic oil 47 parts, and PP wax 3 parts.

[0041] The obtained SBS granules were used for asphalt modification application, and the specific operation was as follows: 70# petroleum asphalt was heated to 180℃, and 9wt% SBS granules (equivalent to 4.5wt% SBS) were added, and stirred for 30min.

[0042] The performance of the modified asphalt was as follows:

[0043] The softening point was 81℃, the 5℃ ductility was 42cm, and the penetration was 46 (0.1mm).

[0044] Example 5

[0045] SBS1801 (star structure, block ratio 30 / 70, molecular weight about 140,000, Hunan Petrochemical production) 40 parts, aromatic oil (LN-24, aniline point 35) 57 parts, PP wax 3 parts were weighed by weight parts, mixed and granulated by a double screw granulator, and the highest temperature during granulation was controlled at 170℃, and the die head temperature was controlled at 75℃. The underwater cutting was used, and 0.3% of calcium stearate powder was added and uniformly mixed to obtain SBS granules.

[0046] The obtained SBS granules were used for asphalt modification application, and the specific operation was as follows: 70# petroleum asphalt was heated to 180℃, 11wt% SBS granules (equivalent to SBS 4.4wt%) were added, and the stirring time was 30min.

[0047] Modified asphalt performance:

[0048] The softening point was 85℃, the 5℃ ductility was 32cm, and the penetration was 60 (0.1mm).

[0049] Comparative Example 1

[0050] This comparative example directly used linear SBS791H for asphalt modification in asphalt modification application, and the preparation was as follows: 70# petroleum asphalt was heated to 160℃, 4.5wt% SBS791H was added according to the proportion, the temperature was increased to 180℃ while stirring, and the stirring was continued for more than 30min, and the shearing machine was sheared at 5000r / min for 30min (or ground by colloid mill), and the modified asphalt was obtained, and the performance of the modified asphalt was tested.

[0051] Modified asphalt performance:

[0052] The softening point was 80.5℃, the 5℃ ductility was 22cm, and the penetration was 40 (0.1mm).

[0053] Comparative Example 1 and Example 1 were compared, the modification temperature of the example was reduced by 10℃, the modification time was shortened by two-thirds, and the ductility of the modified asphalt was doubled. Examples 2, 3 and 4 had basically the same advantages as Example 1.

[0054] Comparative Example 2

[0055] This comparative example directly used star SBS1801 for asphalt modification in asphalt modification application, and the preparation was as follows: 70# petroleum asphalt was heated to 160℃, 4.4wt% star SBS1801 was added according to the proportion, the temperature was increased to 180℃ while stirring, and the stirring was continued for more than 30min, and the shearing machine was sheared at 5000r / min for 30min (or ground by colloid mill), and the modified asphalt was obtained, and the performance of the modified asphalt was tested.

[0056] Modified asphalt performance:

[0057] The softening point is 85.5°C, the 5°C ductility is 16 cm, and the penetration is 50 (0.1 mm).

[0058] For the star structure SBS, Example 5 also has a good advantage compared with Comparative Example 2, not only the time of modified asphalt is shortened by half, but also the ductility of the modified asphalt is doubled.

[0059] Comparative Example 3

[0060] SBS 791H (linear structure, block ratio 30 / 70, molecular weight about 115,000, produced by Hunan Petrochemical) 45 parts and aromatic oil (LN-24, aniline point 35) 55 parts are weighed by weight parts, no additive is added, and after mixing, granulation is performed by a double screw granulator, the highest temperature during granulation is controlled to be 160°C, and the die head temperature is controlled to be 65°C. The underwater cutting is used and 0.3 wt% of calcium stearate powder is added to be uniformly mixed to obtain SBS granules.

[0061] The obtained SBS granules are applied to asphalt modification, the specific operation is the same as that in Example 1, modified asphalt is obtained, and performance test is performed, and the test results are as follows:

[0062] The softening point is 75°C, the 5°C ductility is 52 cm, and the penetration is 60 (0.1 mm).

[0063] Comparative Example 3 and Example 1 are compared, if no additive is added, the softening point of the modified asphalt will be 5°C lower, and the penetration will be 10 (0.1 mm) higher.

[0064] Comparative Example 4

[0065] The difference between this comparative example and Example 1 is only that a linear structure, a block ratio of 25 / 75, and a molecular weight of 80,000 SBS are used, the rest of the steps and conditions are consistent, modified asphalt is obtained, and performance test is performed, and the test results are as follows:

[0066] The softening point is 70°C, the 5°C ductility is 15 cm, and the penetration is 52 (0.1 mm).

[0067] Application Example

[0068] The crushed stone for road construction is heated to about 190°C, 0.6 wt% of the asphalt modification granules prepared in Example 1 is added, stirred for 90 seconds, 5.4 wt% of hot asphalt at about 140°C is added, stirred for 90 seconds, 10 wt% of stone powder is added and stirred for 90 seconds, and then a modified asphalt mixture for road construction is obtained, and performance test is performed on the mixture, and the results are shown in Table 1.

[0069] Table 1

[0070] Performance name Mixture performance parameter Standard requirement Air voids % 4.5 4～6 Intermineral voids % 12.9 ≥12 Saturation % 67 60～70 Stability KN 10.5 ≥8 Residual stability % 98.0 ≥85 Flow value mm 2.41 2～4 Dynamic stability t / mm 3988 ≥2800

[0071] If the SBS is not made into the rapid-melting granules, the finished SBS is directly added into the hot stone material at 190 DEG C, the SBS cannot be melted, and the modified asphalt mixture for road construction cannot be obtained.

[0072] In summary, the asphalt modified granules provided by the application are used for asphalt modification, have the characteristics of rapid melting and dispersion when modified asphalt, energy saving and emission reduction, and the performance of the modified asphalt is excellent, especially has the characteristics of high ductility. The prepared mixture for road site construction has the characteristics of rapid melting, and the performance indexes of the obtained modified asphalt mixture stone meet the standard requirements.

Claims

1. An SBS granular material that rapidly melts and disperses in hot asphalt, characterized in that: It is obtained by screw granulation from raw materials including the following parts by weight: 40-50 parts SBS, 45-57 parts plasticizer and 3-8 parts additives; The block ratio of the SBS is (20-35):(65-80).

2. The SBS granules rapidly melt and disperse in hot asphalt according to claim 1, characterized in that: SBS can be linear SBS with a molecular weight of 80,000 to 150,000 or star-shaped SBS with a molecular weight of 140,000 to 280,000.

3. The SBS granules rapidly melt and disperse in hot asphalt according to claim 2, characterized in that: It is obtained by screw granulation from the following raw materials in parts by weight: 44-48 parts SBS, 48-52 parts plasticizer and 3-7 parts additives.

4. The SBS granules rapidly melt and disperse in hot asphalt according to claim 3, characterized in that: The softener includes at least one of naphthenic oil, aromatic oil, refinery reduced oil (3 or 4 grade), dibutyl ester (2.4 octyl ester), and liquid paraffin.

5. The SBS granules rapidly melt and disperse in hot asphalt according to claim 3, characterized in that: The additive is at least one of petroleum resin, PE wax, PP wax, PE, PP, EVA and rubber powder.

6. The SBS granular material rapidly melted and dispersed in hot asphalt according to any one of claims 1 to 5, characterized in that: The raw materials also include a separating agent.

7. The SBS granules rapidly melt and disperse in hot asphalt according to claim 6, characterized in that: The separating agent is at least one of calcium stearate powder, silica, and talc.

8. The SBS granules rapidly melt and disperse in hot asphalt according to claim 7, characterized in that: The amount of the release agent used is 0.2 to 0.5 wt%.

9. The SBS granules rapidly melt and disperse in hot asphalt according to claim 1, characterized in that: The conditions for screw granulation are: granulation temperature of 150-180℃ and film head temperature of 60-80℃.

10. The SBS granules rapidly melt and disperse in hot asphalt according to any one of claims 1 to 9, characterized in that: It can be applied to the preparation of modified asphalt or to the preparation of modified asphalt mixtures for road construction.

11. The application of SBS granules rapidly melted and dispersed in hot asphalt according to claim 10, characterized in that: When the SBS particles are used in the preparation of modified asphalt, they are added to asphalt at 160-170°C and stirred for 10-30 minutes.

12. The application of SBS granules rapidly melted and dispersed in hot asphalt according to claim 10, characterized in that: When preparing the modified asphalt mixture for road construction, the SBS granules are added to hot aggregate at 190-210°C and stirred.