I-D type modified asphalt based on Ilanan asphalt and preparation method of I-D type modified asphalt

Abstract

The invention belongs to the technical field of modified asphalt, and particularly discloses I-D type modified asphalt based on Iran asphalt and a preparation method thereof, and the I-D type modified asphalt comprises the following components by mass: 88.75% of Iran 60 / 70 matrix asphalt, 4.5% of an SBS modifier, 3% of styrene butadiene rubber, 3.5% of rubber oil, and 0.25% of a stabilizer. According to the I-D type modified asphalt based on the Irandan asphalt and the preparation method of the I-D type modified asphalt, the technical problem that the ductility at 10 DEG C is unqualified after TFOT after traditional Middle East asphalt (Irandan asphalt) is modified is solved, the full indexes of the I-D type modified asphalt prepared by the preparation method conform to the JTGF40-2004 standard, and the high-temperature stability, the low-temperature crack resistance and the ageing resistance are remarkably improved; the modified asphalt is suitable for the fields of expressways and waterproof materials.

Description

Technical Field

[0001] The present invention belongs to the technical field of modified asphalt, and in particular relates to an ID-type modified asphalt based on Iranian asphalt and a preparation method thereof. Background Art

[0002] Modified asphalt is a key material in areas such as highways and waterproofing, and its performance directly impacts project quality. Currently, domestic modified asphalt production relies heavily on base asphalt from specific sources. However, due to the compositional characteristics of Middle Eastern asphalt (such as Iranian asphalt), traditional modification processes exhibit significant deficiencies. After the Thin Film Oven Test (TFOT), the retained ductility at 10°C is generally below the standard requirement (≥15cm), resulting in substandard product.

[0003] The traditional modified formula uses Middle Eastern asphalt (60 / 70) as the base (accounting for 91.75%), combined with an SBS modifier (4.5%), rubber oil (3.5%), and a stabilizer (0.25%). However, due to the lack of compatibility and synergistic anti-aging effects between the asphalt and the modifier, the product's low-temperature crack resistance and aging resistance are insufficient. Furthermore, the traditional process lacks precise design of key parameters such as temperature control and development time, further leading to unstable product performance.

[0004] Therefore, the art needs to develop an ID-type modified asphalt based on Iranian asphalt and a preparation method thereof, which can effectively solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an ID-type modified asphalt based on Iranian asphalt and a preparation method thereof, which solves the technical problem that the 10°C ductility after TFOT of traditional Middle Eastern asphalt (Iranian asphalt) modification is unqualified. The ID-type modified asphalt prepared by the present invention meets all indicators of the JTGF40-2004 standard, and has significantly improved high-temperature stability, low-temperature crack resistance and aging resistance, expanding the source of modified asphalt raw materials, and is suitable for the fields of highways and waterproof materials.

[0006] To achieve the above objectives, the present invention provides an ID-type modified asphalt based on Iranian asphalt, which comprises the following components by mass percentage: 88.75% of Iranian 60 / 70 base asphalt, 4.5% of SBS modifier, 3% of styrene-butadiene rubber, 3.5% of rubber oil, and 0.25% of stabilizer.

[0007] The "elastomer-rubber" composite modification system, based on 88.75% Iranian 60 / 70 base asphalt, is compounded with 4.5% Baling Petrochemical's YH-791H SBS modifier and 3% styrene-butadiene rubber (SBR1). This creates a synergistic network that significantly enhances the asphalt's viscoelastic properties. 3.5% Tianyuan Petrochemical's H02 rubber oil adjusts the asphalt's viscosity and flexibility, while 0.25% Xi'an Zhongkai Yida's ZKYD-3 stabilizer enhances the system's stability. The addition of styrene-butadiene rubber represents a significant innovation in the traditional formulation, significantly improving the asphalt's performance through the synergistic effect of this multi-component system.

[0008] Preferably, the SBS modifier is YH-791H from Sinopec Baling Petrochemical, the styrene-butadiene rubber is SBR1, the rubber oil is HO2 from Tianyuan Petrochemical, and the stabilizer is ZKYD-3 from Xi'an Zhongkai Yida.

[0009] The present invention also provides a method for preparing ID-type modified asphalt based on Iranian asphalt, comprising the following steps:

[0010] Step S1, weighing Iranian 60 / 70 base asphalt, SBS modifier, styrene-butadiene rubber, rubber oil, and stabilizer according to the above mass percentages;

[0011] Step S2: start the modification production process 2.5 hours in advance, start the tail gas purification and recovery system, and heat the Iranian 60 / 70 base asphalt;

[0012] Step S3: transporting the heated Iranian 60 / 70 base asphalt to a swelling tank and performing heat exchange through a plate heat exchanger;

[0013] Step S4: When the amount of matrix asphalt in the swelling tank reaches 4-6 tons, start the swelling tank agitator, add SBS modifier and styrene-butadiene rubber, and stir and swell;

[0014] Step S5: After the stirring and swelling is completed, the mill is started to shear, grind and mix to obtain a mixture;

[0015] Step S6: sending the mixture into a growth tank, adding rubber oil 0.5 hours after the mixing is completed, and adding stabilizer immediately after the rubber oil is added; starting the stirring device when the growth tank volume reaches 5 tons, and continuing stirring for 2 hours after the stabilizer is added to carry out growth;

[0016] Step S7: After the development is completed, the ID type modified asphalt based on Iranian asphalt is obtained.

[0017] Preferably, in step S2, the heating temperature is 150°C.

[0018] Preferably, in step S3, the heat exchange temperature is 180°C.

[0019] Precise temperature control is key to ensuring adequate swelling and development of the modifier and asphalt, which directly affects product performance.

[0020] Preferably, in step S4, the stirring and swelling time is 30 minutes.

[0021] Preferably, in step S5, the mill is started after being manually cranked to confirm that it is not stuck, and the mill current is 140-160A to ensure that the asphalt obtains appropriate shear force during the shear grinding process, so that the modifier is fully dispersed to form a uniform and stable system.

[0022] Preferably, in step S6, the temperature of the development tank is greater than 180° C. and the development time is not less than 5 hours, so as to promote the deep compatibility of the modifier and the asphalt and ensure the uniformity of product performance.

[0023] The present invention adopts the above-mentioned ID type modified asphalt based on Iranian asphalt and its preparation method, and the beneficial effects are as follows:

[0024] (1) Compared with the traditional formula, the raw materials prepared in the present invention are newly added with styrene-butadiene rubber, which effectively solves the problem of substandard performance of modified Middle Eastern asphalt in the traditional method.

[0025] (2) The present invention makes all product indicators qualified through the innovation of formula and process, successfully breaks through the technical bottleneck of asphalt modification in the Middle East, expands the source of raw materials, effectively alleviates the problem of insufficient petroleum asphalt resources in my country, and provides new raw material selection and technical support for the construction of highways, waterproof materials and other fields. The present invention realizes parameterized control of the whole process from heating the matrix asphalt, adding the modifier to the colloid mill shearing, and finished product development (such as the mill current is controlled at 140-160A), ensuring the consistency of product performance between batches and being suitable for large-scale industrial production. In the present invention, YH-791H (SBS1301-1) of Sinopec Baling Petrochemical is clearly selected as SBS modifier, HO2 of Tianyuan Petrochemical is used as rubber oil, ZKYD-3 of Xi'an Zhongkai Yida is used as stabilizer, and styrene-butadiene rubber is SBR1 type. The specific specifications and manufacturers of each modifier are the key to ensuring the effect of the formula.

[0026] (3) The present invention breaks through traditional cognition and successfully applies Middle Eastern asphalt (Iran 60 / 70) to the production of modified asphalt. Through formulation and process innovation, it solves the problem of substandard performance of the raw material after modification in traditional methods, forms a unique raw material utilization technology, and expands the raw material source of modified asphalt.

[0027] The technical solution of the present invention is further described in detail below through examples. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further illustrated by the following examples.

[0029] Unless otherwise defined, technical or scientific terms used in the present invention shall have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs.

[0030] Example

[0031] A method for preparing ID-type modified asphalt based on Iranian asphalt comprises the following steps:

[0032] Step S1: Weigh, according to mass percentage, 88.75% of Iranian 60 / 70 base asphalt, 4.5% of SBS modifier, 3% of styrene-butadiene rubber, 3.5% of rubber oil, and 0.25% of stabilizer.

[0033] The SBS modifier is YH-791H (SBS1301-1) from Sinopec Baling Petrochemical, the styrene-butadiene rubber is SBR1, the rubber oil is H02 from Tianyuan Petrochemical, and the stabilizer is ZKYD-3 from Xi'an Zhongkai Yida.

[0034] Step S2: Each batch is 30 tons, and the production is carried out in batches according to the planned quantity. The modification production process is started 2.5 hours in advance, the tail gas purification and recovery system is started, and the Iranian 60 / 70 base asphalt is heated at a heating temperature of 150°C.

[0035] Step S3: Sequentially open the expansion tank's modified production base asphalt outlet and inlet valves. Adjust the production capacity to 30 tons on the system interface and enter the recipe parameters. Transfer the heated Iranian 60 / 70 base asphalt to the expansion tank and exchange heat through a plate heat exchanger at 180°C.

[0036] Step S4: When the amount of matrix asphalt in the swelling tank reaches 4-6 tons, start the swelling tank agitator, add SBS modifier and styrene-butadiene rubber, and stir and swell for 30 minutes.

[0037] Step S5: After the stirring and swelling is completed, the mill is started to perform shearing, grinding and mixing. The mill current is 140-160A to obtain a mixture.

[0038] Step S6: The mixture is transferred to a growth tank. Rubber oil is added 0.5 hours after mixing is complete, and stabilizer is added immediately after the rubber oil is added. When the growth tank volume reaches 5 tons, the stirring device is started. After the stabilizer is added, stirring is continued for 2 hours to allow growth. The temperature of the growth tank is greater than 180°C, and the growth time is not less than 5 hours.

[0039] Step S7: After the development is completed, the ID type modified asphalt based on Iranian asphalt is obtained.

[0040] Comparative Example

[0041] A method for preparing modified asphalt comprises the following steps:

[0042] Step S1: Weigh, according to mass percentage, 91.75% of Iranian 60 / 70 base asphalt, 4.5% of SBS modifier, 3.5% of rubber oil, and 0.25% of stabilizer.

[0043] The SBS modifier is YH-791H (SBS1301-1) from Sinopec Baling Petrochemical, the rubber oil is H02 from Tianyuan Petrochemical, and the stabilizer is ZKYD-3 from Xi'an Zhongkai Yida.

[0044] Step S2: Each batch is 30 tons, and the production is carried out in batches according to the planned quantity. The modification production process is started 2.5 hours in advance, the tail gas purification and recovery system is started, and the Iranian 60 / 70 base asphalt is heated at a heating temperature of 150°C.

[0045] Step S3: Sequentially open the expansion tank's modified production base asphalt outlet and inlet valves. Adjust the production capacity to 30 tons on the system interface and enter the recipe parameters. Transfer the heated Iranian 60 / 70 base asphalt to the expansion tank and exchange heat through a plate heat exchanger at 180°C.

[0046] Step S4: When the amount of matrix asphalt in the swelling tank reaches 4-6 tons, start the swelling tank agitator, add SBS modifier, and stir and swell for 30 minutes.

[0047] Step S5: After the stirring and swelling is completed, the mill is started to perform shearing, grinding and mixing. The mill current is 140-160A to obtain a mixture.

[0048] Step S6: The mixture is transferred to a growth tank. Rubber oil is added 0.5 hours after mixing is complete, and stabilizer is added immediately after the rubber oil is added. When the growth tank volume reaches 5 tons, the stirring device is started. After the stabilizer is added, stirring is continued for 2 hours to allow growth. The temperature of the growth tank is greater than 180°C, and the growth time is not less than 5 hours.

[0049] Step S7: After the development is completed, the modified asphalt is obtained.

[0050] The ID type modified asphalt prepared in the example and the modified asphalt prepared in the comparative example were subjected to performance tests, and the results are shown in Tables 1-5.

[0051] Table 1 Parallel test 1 test results

[0052]

[0053]

[0054] Table 2 Parallel test 2 test results

[0055]

[0056]

[0057] Table 3 Parallel test 3 test results

[0058]

[0059]

[0060] Table 4 Parallel test 4 test results

[0061]

[0062]

[0063] Table 5 Parallel test 5 test results

[0064]

[0065]

[0066] From the above test results, it can be seen that all indicators of the ID modified asphalt prepared in the embodiment meet the JTGF40-2004 standard:

[0067] (1) Excellent high and low temperature performance.

[0068] High-temperature stability is significantly improved: the measured softening point reaches 81-84°C, which is 5-8°C higher than the 76-79°C of the embodiment, far exceeding the requirement of ≥60°C of the JTGF40-2004 standard. It is less likely to soften and flow in high-temperature environments, and can effectively resist road rutting, oil spillage and other diseases, ensuring driving safety and road smoothness in summer.

[0069] The low-temperature crack resistance is greatly enhanced: the elongation at 5°C reaches 31-34cm, which is more than 15% higher than the 27-30cm in the embodiment. The asphalt still has excellent ductility in low-temperature environments and can effectively resist shrinkage cracking caused by temperature drop in the road surface. It is especially suitable for use in cold areas and can significantly extend the service life of the road surface.

[0070] (2) Excellent viscoelastic properties.

[0071] Precise needle penetration control: The needle penetration at 25°C is stable at 53-56 (0.1mm), which is within the standard range of 40-60. This ensures that the asphalt has appropriate hardness and flexibility at room temperature, ensuring that the road surface can moderately buffer deformation when bearing vehicle loads, thereby improving driving comfort.

[0072] High elastic recovery ability: The elastic recovery rate at 25°C is as high as 88-95%, which is significantly higher than the 82-88% in the embodiment and far exceeds the standard requirement of ≥75%. The asphalt can rebound quickly after being deformed by external force, greatly reducing the risk of road rutting.

[0073] (3) Excellent aging resistance and storage stability.

[0074] The anti-aging performance is significant: after TFOT (thin film oven test), the residual needle penetration ratio reaches 77.8-82.3%, which is significantly improved compared with the 74.2-79.6% of the embodiment; the residual elongation at 10°C is 15.8-17.8cm, far exceeding the 10-11.3cm of the embodiment, indicating that the asphalt has stronger resistance to ultraviolet rays and oxidation during long-term use, and its performance decays more slowly.

[0075] Good storage stability: The 48h separation softening point difference is 1.8-2.3℃, which meets the standard requirement of ≤2.5℃, indicating that the various components of the asphalt have good compatibility and are not easy to stratify during storage and transportation, ensuring the consistency of product quality and reducing the pretreatment process before construction.

[0076] (4) Environmentally friendly and safe production process.

[0077] The exhaust gas purification and recovery system is turned on throughout the production process, with a flash point of 311-327°C, which is higher than the standard requirement of ≥230°C, reducing safety risks in the production process and meeting environmental protection requirements.

[0078] Therefore, the present invention adopts the above-mentioned ID-type modified asphalt based on Iranian asphalt and its preparation method, which solves the technical problem that the traditional Middle Eastern asphalt (Iranian asphalt) has unqualified ductility at 10°C after TFOT after modification. The ID-type modified asphalt prepared by the present invention meets the JTGF40-2004 standard in all indicators, and its high-temperature stability, low-temperature crack resistance and anti-aging performance are significantly improved, which expands the source of modified asphalt raw materials and is suitable for the fields of highways and waterproof materials.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An ID type modified asphalt based on Iranian asphalt, characterized in that: The composition includes the following components by mass percentage: 88.75% of Iranian 60 / 70 base asphalt, 4.5% of SBS modifier, 3% of styrene-butadiene rubber, 3.5% of rubber oil, and 0.25% of stabilizer.

2. The ID type modified asphalt based on Iranian asphalt according to claim 1, characterized in that: The SBS modifier is YH-791H from Sinopec Baling Petrochemical, the styrene-butadiene rubber is SBR1, the rubber oil is H02 from Tianyuan Petrochemical, and the stabilizer is ZKYD-3 from Xi'an Zhongkai Yida.

3. A method for preparing ID-type modified asphalt based on Iranian asphalt according to any one of claims 1 to 2, characterized in that: The following steps are involved: Step S1, weighing Iranian 60 / 70 base asphalt, SBS modifier, styrene-butadiene rubber, rubber oil, and stabilizer according to the above mass percentages; Step S2: start the modification production process 2.5 hours in advance, start the tail gas purification and recovery system, and heat the Iranian 60 / 70 base asphalt; Step S3: transporting the heated Iranian 60 / 70 base asphalt to a swelling tank and performing heat exchange through a plate heat exchanger; Step S4: When the amount of matrix asphalt in the swelling tank reaches 4-6 tons, start the swelling tank agitator, add SBS modifier and styrene-butadiene rubber, and stir and swell; Step S5: After the stirring and swelling is completed, the mill is started to shear, grind and mix to obtain a mixture; Step S6: sending the mixture into a growth tank, adding rubber oil 0.5 hours after the mixing is completed, and adding stabilizer immediately after the rubber oil is added; starting the stirring device when the growth tank volume reaches 5 tons, and continuing stirring for 2 hours after the stabilizer is added to carry out growth; Step S7: After the development is completed, the ID type modified asphalt based on Iranian asphalt is obtained.

4. The method for preparing an ID-type modified asphalt based on Iranian asphalt according to claim 3, characterized in that: In step S2, the heating temperature is 150°C.

5. The method for preparing an ID-type modified asphalt based on Iranian asphalt according to claim 3, characterized in that: In step S3, the heat exchange temperature is 180°C.

6. The method for preparing an ID-type modified asphalt based on Iranian asphalt according to claim 3, characterized in that: In step S4, the stirring and swelling time is 30 minutes.

7. The method for preparing ID-type modified asphalt based on Iranian asphalt according to claim 3, characterized in that: In step S5, the mill current is 140-160A.

8. The method for preparing ID-type modified asphalt based on Iranian asphalt according to claim 3, characterized in that: In step S6, the temperature of the development tank is greater than 180° C., and the development time is not less than 5 hours.

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