High-viscosity high-temperature-resistant asphalt and preparation method thereof

Abstract

The invention relates to the technical field of asphalt, and discloses high-viscosity high-temperature-resistant asphalt and a preparation method thereof.The high-viscosity high-temperature-resistant asphalt is prepared from matrix asphalt, a fireproof compatilizer, a styrene-butadiene-styrene block copolymer, terpene resin, silicone oil coated mica powder, an antioxidant and an ultraviolet absorbent. The fireproof compatilizer and the silicone oil coated mica powder are prepared to participate in the preparation process of the asphalt, so that the prepared asphalt has the characteristics of excellent high-temperature resistance and flame retardance and high viscosity, and the problems of low viscosity, low adhesive force on a road, general high-temperature resistance, poor flame retardance and the like of common asphalt are solved. The problems of insufficient road protection effect and influence on road durability due to the fact that the asphalt is easy to soften and flow to generate deformation in high-temperature weather in the prior art are solved, and the problems that common asphalt does not have fireproof capability and is easy to spread and drip when a fire disaster occurs and the use safety is influenced are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt, and in particular to a high-viscosity and high-temperature resistant asphalt and a preparation method thereof. Background Art

[0002] In the construction of modern transportation infrastructure, asphalt is a key pavement material, and its quality directly affects the quality, safety and service life of the road. With the rapid development of modern transportation construction, traditional asphalt has exposed a series of problems in the application process. First, the viscosity and high temperature resistance of traditional asphalt are insufficient. Under high temperature environment, due to insufficient viscosity, the coating formed by asphalt on the road has weak adhesion and is easily affected by external factors such as vehicle load and water flow, resulting in frequent problems such as road peeling and potholes. Even under continuous high temperature, asphalt begins to soften, flow and even seriously deform, which will not only weaken the support and protection of asphalt on the road, but also increase the speed of road damage, shorten the service life of the road, and increase the cost of road maintenance. At the same time, traditional asphalt does not have the ability to prevent fire. Asphalt itself is a combustible substance. When a fire occurs, it will not only cause the spread of the fire, but also produce high-temperature molten droplets, further expanding the fire, increasing the difficulty of rescue, and affecting the safety performance of the road.

[0003] The patent with publication number CN116162360B discloses a method for preparing high-viscosity elastic modified asphalt. The patent adopts a mixed asphalt in a specific proportion as a matrix, adds a specific high-viscosity modifier and SBS modifier, and then compounds a specific high-viscosity enhancer. The performance indicators of this type of asphalt meet the use requirements, and the viscosity is greatly improved. The adhesion, high-temperature stability, and fatigue durability of the asphalt pavement are effectively improved, and it has excellent use effects. However, the flame retardant ability of the asphalt prepared by this patent is general. When a fire occurs, it may accelerate the spread of fire, posing a great safety hazard. Summary of the invention

[0004] The purpose of the present invention is to provide a high-viscosity and high-temperature resistant asphalt and a preparation method thereof, which solves the following technical problems: (1) Ordinary asphalt has low viscosity, weak adhesion on the road, and average high-temperature resistance. It is easy to soften, flow and deform in hot weather, so it is insufficient to protect the road and affects the durability of the road; (2) Ordinary asphalt does not have fire resistance and is easy to spread and drip when a fire occurs, affecting the safety of use.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A high-viscosity and high-temperature resistant asphalt comprises the following raw materials in parts by weight: 90-110 parts of base asphalt, 10-12 parts of fireproof compatibilizer, 8-10 parts of styrene-butadiene-styrene block copolymer, 6-8 parts of terpene resin, 5-6 parts of silicone oil coated mica powder, 2-3 parts of antioxidant, and 1-3 parts of ultraviolet absorber.

[0006] Furthermore, the antioxidant is any one of antioxidant 1010, antioxidant 1135, and antioxidant 168; the ultraviolet absorber is any one of ultraviolet absorber UV-1164 and ultraviolet absorber UV-120.

[0007] Furthermore, the preparation method of the fire retardant compatibilizer comprises the following steps: Put the matrix asphalt in a three-necked flask, heat it to 110-120°C, introduce nitrogen, add maleic anhydride, allyl diethyl phosphate and initiator, stir well for 2-3 hours, collect the product, and obtain a fire retardant compatibilizer.

[0008] In this scheme, under the action of an initiator, a free radical polymerization reaction occurs between the matrix asphalt, maleic anhydride and allyl diethyl phosphate to obtain a fire retardant compatibilizer. In this fire retardant compatibilizer, maleic anhydride is combined with the matrix asphalt, and has good compatibility with the asphalt. At the same time, the maleic anhydride group in its structure can enhance the binding ability between the components in the asphalt matrix material and the asphalt, so that the prepared asphalt structure is tight and not easy to crack. At the same time, allyl diethyl phosphate is added to the preparation process of the compatibilizer in a chemically bonded manner, which can enhance the bonding ability of allyl diethyl phosphate on the one hand. The dispersibility of ethyl ester in asphalt matrix materials. On the other hand, the phosphate group in the structure of allyl diethyl phosphate can be thermally decomposed at high temperature to produce water and acidic substances, thereby diluting the combustibles and reducing the combustion performance. At the same time, it can react chemically with the hydrogen element in the combustibles to generate non-flammable phosphorus-containing compounds, reduce the combustion performance of the combustibles, and enhance the flame retardant effect. By combining with a compatibilizer, small molecule flame retardants can be anchored in the asphalt, effectively avoiding the migration of small molecule effective substances over a long period of time, thereby losing the flame retardant effect and causing safety hazards.

[0009] Furthermore, the initiator is any one of benzoyl peroxide and dicumyl peroxide.

[0010] Furthermore, the method for preparing the silicone oil-coated mica powder comprises the following steps: S1: placing mica powder in deionized water, ultrasonically dispersing for 10-12 minutes, adding 2-hydroxy-N,N,N-trimethylethylammonium chloride, heating and stirring, filtering, washing, drying and collecting the product to obtain modified mica powder; S2: Place the modified mica powder in toluene, ultrasonically disperse it for 12-15 minutes, add the epoxy-terminated silicone oil and the catalyst, heat it to 85-90°C and react for 5-6 hours, filter, wash, dry and collect the product to obtain the silicone oil-coated mica powder.

[0011] In this scheme, the quaternary ammonium group in the structure of 2-hydroxy-N,N,N-trimethylethylammonium chloride carries a positive charge, and the mica powder has a unique lamellar structure. Through electrostatic adsorption, 2-hydroxy-N,N,N-trimethylethylammonium chloride is intercalated with the mica powder to introduce active hydroxyl groups on its surface to obtain modified mica powder. Under the action of a catalyst, the active hydroxyl groups on the surface of the modified mica powder undergo a ring-opening reaction with the epoxy groups in the structure of the terminal epoxy silicone oil to obtain silicone oil-coated mica powder; the lamellar spacing of the silicone oil-coated mica powder is expanded, which effectively improves the compatibility of the mica powder in asphalt. At the same time, the silicone oil on its surface has excellent heat resistance, and the mica powder has a heat-insulating effect. Combining it with the mica powder It can effectively inhibit the thermal motion of asphalt molecules at high temperatures and improve the high temperature resistance of asphalt. At the same time, the silicone oil on the surface of the silicone oil-coated mica powder can adsorb the aromatic components in the asphalt through intermolecular forces. The hydroxyl groups produced after the epoxy ring opening can interact with the maleic anhydride groups in the fire retardant compatibility agent structure to produce a multi-level bonding effect, so that the silicone oil-coated mica powder has excellent bonding strength with the asphalt matrix, enhances the cohesion of the asphalt material, makes it less likely to crack and break during use, and increases the service life of the asphalt. At the same time, when a fire occurs, the lamellar structure of the mica powder can produce an inorganic-organic synergistic flame retardant effect with the phosphate groups in the fire retardant compatibility agent, effectively enhancing the flame retardant ability of the asphalt.

[0012] Furthermore, in step S1, the temperature of the heating and stirring is 45-55°C and the time is 4-6h.

[0013] Furthermore, in step S2, the catalyst is boron trifluoride etherate.

[0014] A method for preparing high-viscosity and high-temperature resistant asphalt comprises the following steps: Step 1: fully mix the base asphalt, fire retardant compatibilizer, styrene-butadiene-styrene block copolymer, terpene resin, and silicone oil-coated mica powder, heat to 170-180° C., and stir thoroughly to obtain an asphalt matrix material; Step 2: Add antioxidant and ultraviolet absorber to the asphalt matrix material, raise the temperature to 150-160° C., stir thoroughly for 3-5 hours, and collect the product after the end to obtain asphalt.

[0015] Furthermore, in step 1, the stirring rate of the sufficient stirring is 200-300 r / min, and the time is 2-3 h.

[0016] Beneficial effects of the present invention: The present invention prepares a fire retardant compatibilizer and silicone oil-coated mica powder and participates in the preparation process of asphalt, so that the prepared asphalt has excellent high temperature resistance and flame retardant properties, and also has the characteristics of high viscosity, can meet the use requirements in various environments, and has a long service life.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 The present invention is a flow chart for preparing the high-viscosity and high-temperature resistant asphalt. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The preparation methods of the fire retardant compatibilizer and silicone oil coated mica powder in the following embodiments and comparative examples of the present invention are as follows: 1. Preparation of fire retardant compatibilizer Place 20 g of base asphalt in a three-necked flask, heat to 110°C, introduce nitrogen, add 1 g of maleic anhydride, 1.2 g of allyl diethyl phosphate and 0.3 g of benzoyl peroxide, stir thoroughly for 2 h, collect the product, and obtain a fire retardant compatibilizer.

[0022] 2. Preparation of silicone oil coated mica powder S1: 5 g of mica powder was placed in 100 ml of deionized water, and after ultrasonic dispersion for 10 min, 6 g of 2-hydroxy-N,N,N-trimethylethylammonium chloride was added, and the temperature was raised to 45 ° C and stirred for 4 h. The product was collected after filtration, washing, and drying to obtain modified mica powder; S2: Place 6 g of modified mica powder in 120 ml of toluene, ultrasonically disperse for 12 minutes, add 5.8 g of terminal epoxy silicone oil and 0.2 g of boron trifluoride etherate, heat to 85°C and react for 5 hours, filter, wash, dry and collect the product to obtain silicone oil-coated mica powder. Example

[0023] Asphalt preparation Step 1: 90 parts of base asphalt, 10 parts of fire retardant compatibilizer, 8 parts of styrene-butadiene-styrene block copolymer, 6 parts of terpene resin, and 5 parts of silicone oil-coated mica powder are fully mixed, heated to 170°C, and stirred at a rate of 200 r / min for 2 hours to obtain an asphalt matrix material; Step 2: Add 2 parts of antioxidant 1010 and 1 part of ultraviolet absorber UV-1164 to the asphalt base material, heat to 150°C, stir thoroughly for 3 hours, and collect the product after the end to obtain asphalt. Example

[0024] Asphalt preparation Step 1: 100 parts of base asphalt, 11 parts of fire retardant compatibilizer, 9 parts of styrene-butadiene-styrene block copolymer, 7 parts of terpene resin, and 5.5 parts of silicone oil-coated mica powder are fully mixed, heated to 175°C, and stirred at a rate of 250 r / min for 2.5 hours to obtain an asphalt matrix material; Step 2: Add 2.5 parts of antioxidant 1135 and 2 parts of ultraviolet absorber UV-120 to the asphalt base material, heat to 155°C, stir thoroughly for 4 hours, and collect the product after the end to obtain asphalt. Example

[0025] Asphalt preparation Step 1: 110 parts of base asphalt, 12 parts of fire retardant compatibilizer, 10 parts of styrene-butadiene-styrene block copolymer, 8 parts of terpene resin, and 6 parts of silicone oil-coated mica powder are fully mixed, heated to 180° C., and stirred at a rate of 300 r / min for 3 hours to obtain an asphalt matrix material; Step 2: Add 3 parts of antioxidant 168 and 3 parts of ultraviolet absorber UV-1164 to the asphalt base material, heat to 160°C, stir thoroughly for 5 hours, and collect the product after the end to obtain asphalt.

[0026] Comparative Example 1 Asphalt preparation Step 1: 100 parts of base asphalt, 9 parts of styrene-butadiene-styrene block copolymer, 7 parts of terpene resin, and 5.5 parts of silicone oil-coated mica powder are fully mixed, heated to 175° C., and stirred at a rate of 250 r / min for 2.5 hours to obtain an asphalt matrix material; Step 2: Add 2.5 parts of antioxidant 1135 and 2 parts of ultraviolet absorber UV-120 to the asphalt base material, heat to 155°C, stir thoroughly for 4 hours, and collect the product after the end to obtain asphalt.

[0027] Comparative Example 2 Asphalt preparation Step 1: 100 parts of base asphalt, 11 parts of fire retardant compatibilizer, 9 parts of styrene-butadiene-styrene block copolymer, and 7 parts of terpene resin are fully mixed, heated to 175° C., and stirred at a rate of 250 r / min for 2.5 hours to obtain an asphalt matrix material; Step 2: Add 2.5 parts of antioxidant 1135 and 2 parts of ultraviolet absorber UV-120 to the asphalt base material, heat to 155°C, stir thoroughly for 4 hours, and collect the product after the end to obtain asphalt.

[0028] Comparative Example 3 Asphalt preparation Step 1: 100 parts of base asphalt, 11 parts of fire retardant compatibilizer, 9 parts of styrene-butadiene-styrene block copolymer, 7 parts of terpene resin, and 5.5 parts of modified mica powder are fully mixed, heated to 175° C., and stirred at a rate of 250 r / min for 2.5 hours to obtain an asphalt matrix material; Step 2: Add 2.5 parts of antioxidant 1135 and 2 parts of ultraviolet absorber UV-120 to the asphalt base material, heat to 155°C, stir thoroughly for 4 hours, and collect the product after the end to obtain asphalt.

[0029] Performance Testing The asphalt prepared in Examples 1 to 3 and Comparative Examples 1 to 4 was used as a sample. The softening point of the sample was tested by the ring and ball method according to the GB / T4507-2014 standard to determine the high temperature resistance of the sample. The flame retardant grade of the sample was tested according to the UL-94 standard. The dynamic viscosity of the sample at 60°C was tested according to the JTG E20-2011 standard. The specific test results are shown in the following table:

[0030] It can be seen from the above table that the samples prepared in Examples 1 to 3 all have excellent high temperature resistance, flame retardant effect and high viscosity. In the sample prepared in Comparative Example 1, no fire retardant compatibilizer was added, the flame retardant performance was poor, and the viscosity and high temperature resistance were not as good as those in the example. In the sample prepared in Comparative Example 2, no silicone oil-coated mica powder was added, the high temperature resistance was poor, and the viscosity was not as good as that in the example. In the sample prepared in Comparative Example 3, modified mica powder and fire retardant compatibilizer were directly added, the flame retardant performance was excellent, and the high temperature resistance was average, which could hardly meet the use requirements in high temperature environment.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0032] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A high-viscosity and high-temperature resistant asphalt, characterized in that: The invention comprises the following raw materials in parts by weight: 90-110 parts of base asphalt, 10-12 parts of fireproof compatibilizer, 8-10 parts of styrene-butadiene-styrene block copolymer, 6-8 parts of terpene resin, 5-6 parts of silicone oil coated mica powder, 2-3 parts of antioxidant and 1-3 parts of ultraviolet absorber.

2. The high-viscosity and high-temperature resistant asphalt according to claim 1, characterized in that: The antioxidant is any one of antioxidant 1010, antioxidant 1135, and antioxidant 168; the ultraviolet absorber is any one of ultraviolet absorber UV-1164 and ultraviolet absorber UV-120.

3. The high-viscosity and high-temperature resistant asphalt according to claim 1, characterized in that: The preparation method of the fire retardant compatibilizer comprises the following steps: Put the matrix asphalt in a three-necked flask, heat it to 110-120°C, introduce nitrogen, add maleic anhydride, allyl diethyl phosphate and initiator, stir well for 2-3 hours, collect the product, and obtain a fire retardant compatibilizer.

4. The high-viscosity and high-temperature resistant asphalt according to claim 3, characterized in that: The initiator is any one of benzoyl peroxide and dicumyl peroxide.

5. The high-viscosity and high-temperature resistant asphalt according to claim 1, characterized in that: The method for preparing the silicone oil-coated mica powder comprises the following steps: S1: placing mica powder in deionized water, ultrasonically dispersing for 10-12 minutes, adding 2-hydroxy-N,N,N-trimethylethylammonium chloride, heating and stirring, filtering, washing, drying and collecting the product to obtain modified mica powder; S2: Place the modified mica powder in toluene, ultrasonically disperse it for 12-15 minutes, add the epoxy-terminated silicone oil and the catalyst, heat it to 85-90°C and react for 5-6 hours, filter, wash, dry and collect the product to obtain the silicone oil-coated mica powder.

6. The high-viscosity and high-temperature resistant asphalt according to claim 5, characterized in that: In step S1, the temperature of the heating and stirring is 45-55°C and the time is 4-6h.

7. The high-viscosity and high-temperature resistant asphalt according to claim 5, characterized in that: In step S2, the catalyst is boron trifluoride etherate.

8. A method for preparing high-viscosity and high-temperature resistant asphalt as claimed in claim 1, characterized in that: The following steps are involved: Step 1: fully mix the base asphalt, fire retardant compatibilizer, styrene-butadiene-styrene block copolymer, terpene resin, and silicone oil-coated mica powder, heat to 170-180° C., and stir thoroughly to obtain an asphalt matrix material; Step 2: Add antioxidant and ultraviolet absorber to the asphalt matrix material, raise the temperature to 150-160° C., stir thoroughly for 3-5 hours, and collect the product after the end to obtain asphalt.

9. The method for preparing high-viscosity and high-temperature resistant asphalt according to claim 8, characterized in that: In step 1, the stirring rate of the sufficient stirring is 200-300 r / min, and the time is 2-3 h.

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