Highly viscous high-temperature resistant asphalt and preparation method thereof

Abstract

This invention relates to the field of asphalt technology and discloses a high-viscosity, high-temperature resistant asphalt and its preparation method. This high-viscosity, high-temperature resistant asphalt comprises the following raw materials: base asphalt, fire-retardant compatibilizer, styrene-butadiene-styrene block copolymer, terpene resin, silicone oil-coated mica powder, antioxidant, and ultraviolet absorber. This invention, by incorporating the fire-retardant compatibilizer and silicone oil-coated mica powder into the asphalt preparation process, results in asphalt with excellent high-temperature resistance, flame retardant properties, and high viscosity. This solves the problems of ordinary asphalt, such as low viscosity, weak adhesion to roads, and generally poor high-temperature resistance, which easily softens, flows, and deforms in high temperatures, thus providing insufficient protection for roads and affecting road durability. It also addresses the issue that ordinary asphalt lacks fire resistance, easily spreading and dripping in the event of a fire, affecting safety.

Description

Technical Field

[0001] This invention relates to the field of asphalt technology, specifically to a high-viscosity, high-temperature resistant asphalt and its preparation method. Background Technology

[0002] In modern transportation infrastructure construction, asphalt, as a key road paving material, directly affects the quality, safety, and service life of roads. With the rapid development of modern transportation construction, traditional asphalt has revealed a series of problems in its application. First, traditional asphalt lacks sufficient viscosity and high-temperature resistance. Under high temperatures, due to insufficient viscosity, the coating formed by asphalt on the road surface has weak adhesion and is easily affected by external factors such as vehicle loads and water erosion, leading to frequent problems such as road surface peeling and potholes. Even under sustained high temperatures, asphalt begins to soften, flow, and even undergo severe deformation, not only weakening its supporting and protective function for the road but also accelerating road damage, shortening road lifespan, and increasing road maintenance costs. Simultaneously, traditional asphalt lacks fire resistance. Asphalt itself is a flammable substance; in the event of a fire, it not only causes the fire to spread but also produces high-temperature dripping, further expanding the fire, increasing the difficulty of rescue, and affecting road safety performance.

[0003] Patent CN116162360B discloses a method for preparing high viscoelastic modified asphalt. This patent uses a specific ratio of mixed asphalt as a matrix, applies specific high-viscosity modifiers and SBS modifiers, and then combines them with specific high-viscosity reinforcing agents. This results in asphalt with significantly improved viscosity while meeting the performance requirements, effectively improving the adhesion, high-temperature stability, and fatigue durability of asphalt pavement, and exhibiting excellent performance. However, the asphalt prepared by this patent has generally poor flame retardancy and may accelerate the spread of fire in the event of a fire, posing a significant safety hazard. Summary of the Invention

[0004] The purpose of this invention is to provide a high-viscosity, high-temperature resistant asphalt and its preparation method, which solves the following technical problems: (1) Ordinary asphalt has low viscosity, weak adhesion on the road, and generally poor high-temperature resistance. It is easy to soften and flow and deform in high-temperature weather, thus it is not enough to protect the road and affects the road durability; (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 objective of this invention can be achieved through the following technical solutions:

[0006] A high-viscosity, high-temperature resistant asphalt comprises the following raw materials in parts by weight: 90-110 parts base asphalt, 10-12 parts fire retardant compatibilizer, 8-10 parts styrene-butadiene-styrene block copolymer, 6-8 parts terpene resin, 5-6 parts silicone oil-coated mica powder, 2-3 parts antioxidant, and 1-3 parts ultraviolet absorber.

[0007] 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.

[0008] Furthermore, the preparation method of the fire retardant compatibilizer includes the following steps:

[0009] Place the base bitumen in a three-necked flask, heat it to 110-120℃, introduce nitrogen gas, add maleic anhydride, allyl diethyl phosphate and initiator, stir thoroughly for 2-3 hours, collect the product, and obtain the fire retardant compatibilizer.

[0010] In this scheme, under the action of an initiator, a free radical polymerization reaction occurs between the base asphalt, maleic anhydride, and allyl diethyl phosphate to obtain a fire-retardant compatibilizer. This fire-retardant compatibilizer combines maleic anhydride with the base asphalt, exhibiting good compatibility with the asphalt. Simultaneously, the maleic anhydride groups in its structure enhance the bonding ability between the components in the asphalt matrix material and the asphalt, resulting in a dense asphalt structure that is less prone to cracking. Furthermore, allyl diethyl phosphate is chemically incorporated into the compatibilizer preparation process, which enhances the bonding ability between the allyl diethyl phosphate and the base asphalt. On the one hand, the phosphate groups in the structure of this allyl diethyl phosphate can thermally decompose at high temperatures to produce water and acidic substances, thereby diluting the combustibles and reducing their combustion performance. On the other hand, it can chemically react with hydrogen in the combustibles to generate non-flammable phosphorus compounds, further reducing the combustion performance of the combustibles and enhancing the flame retardant effect. By combining with compatibilizers, it can anchor small molecule flame retardants in the asphalt, effectively preventing the migration of small molecule effective substances over a long period of use, which would lead to loss of flame retardant effect and safety hazards.

[0011] Furthermore, the initiator is either benzoyl peroxide or dicumyl peroxide.

[0012] Furthermore, the preparation method of the silicone oil-coated mica powder includes the following steps:

[0013] S1: Place mica powder in deionized water, ultrasonically disperse for 10-12 min, add 2-hydroxy-N,N,N-trimethylethylammonium chloride, heat and stir, filter, wash, dry and collect the product to obtain modified mica powder;

[0014] S2: Place the modified mica powder in toluene, ultrasonically disperse it for 12-15 min, then add terminal epoxy silicone oil and catalyst, heat to 85-90℃ and react for 5-6 h, filter, wash and dry, and collect the product to obtain silicone oil-coated mica powder.

[0015] In this scheme, the quaternary ammonium group in the 2-hydroxy-N,N,N-trimethylethylammonium chloride structure carries a positive charge. Mica powder has a unique lamellar structure. Through electrostatic adsorption, 2-hydroxy-N,N,N-trimethylethylammonium chloride is used to intercalate the mica powder, introducing active hydroxyl groups onto its surface to obtain modified mica powder. Under the action of a catalyst, the active hydroxyl groups on the surface of this modified mica powder undergo a ring-opening reaction with the epoxy groups in the terminal epoxy silicone oil structure to obtain silicone oil-coated mica powder. The interlayer spacing of this silicone oil-coated mica powder is widened, effectively improving the compatibility of 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 insulation effect. Combining it with mica powder... This product effectively inhibits the thermal motion of asphalt molecules at high temperatures, enhancing the high-temperature resistance of asphalt. Simultaneously, the silicone oil coating on the surface of the mica powder can adsorb aromatic components in the asphalt through intermolecular forces. The hydroxyl groups generated after the epoxy groups open can interact with the maleic anhydride groups in the fire retardant compatibilizer structure, producing a multi-level bonding effect. This results in excellent bonding strength between the silicone oil-coated mica powder and the asphalt matrix, strengthening the cohesion of the asphalt material and making it less prone to cracking and damage during use, thus extending the service life of the asphalt. Furthermore, in the event of a fire, the layered structure of the mica powder can produce an inorganic-organic synergistic flame-retardant effect with the phosphate groups in the fire retardant compatibilizer, effectively enhancing the flame-retardant ability of the asphalt.

[0016] Furthermore, in step S1, the temperature for heating and stirring is 45-55℃, and the time is 4-6 hours.

[0017] Further, in step S2, the catalyst is boron trifluoride diethyl ether.

[0018] A method for preparing high-viscosity, high-temperature resistant asphalt includes the following steps:

[0019] Step 1: Thoroughly mix the base asphalt, fire retardant compatibilizer, styrene-butadiene-styrene block copolymer, terpene resin, and silicone oil-coated mica powder, heat to 170-180℃, and stir thoroughly to obtain the asphalt matrix material.

[0020] Step 2: Add antioxidants and UV absorbers to the asphalt matrix material, heat to 150-160℃, stir thoroughly for 3-5 hours, collect the product after the process, and obtain asphalt.

[0021] Furthermore, in step one, the stirring rate for thorough stirring is 200-300 r / min, and the time is 2-3 h.

[0022] The beneficial effects of this invention are:

[0023] This invention incorporates a fire-retardant compatibilizer and silicone oil-coated mica powder into the asphalt preparation process, resulting in asphalt with excellent high-temperature resistance, flame retardant properties, and high viscosity. This allows it to meet the needs of various environments and has a long service life.

[0024] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a flowchart illustrating the preparation process of the high-viscosity, high-temperature resistant asphalt of this invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] 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:

[0029] I. Preparation of Fire Retardant Compatibilizer

[0030] Place 20g of base bitumen in a three-necked flask, heat to 110℃, introduce nitrogen gas, add 1g of maleic anhydride, 1.2g of allyl diethyl phosphate and 0.3g of benzoyl peroxide, stir thoroughly for 2 hours, collect the product, and obtain the fire retardant compatibilizer.

[0031] II. Preparation of Silicone Oil-Coated Mica Powder

[0032] S1: Place 5g of mica powder in 100ml of deionized water, ultrasonically disperse for 10min, add 6g of 2-hydroxy-N,N,N-trimethylethylammonium chloride, heat to 45℃ and stir thoroughly for 4h, filter, wash and dry, and collect the product to obtain modified mica powder.

[0033] S2: Place 6g of modified mica powder in 120ml of toluene, ultrasonically disperse for 12min, then add 5.8g of terminal epoxy silicone oil and 0.2g of boron trifluoride ether, heat to 85℃ and react for 5h, filter, wash and dry, and collect the product to obtain silicone oil-coated mica powder. Example

[0034] Preparation of asphalt

[0035] Step 1: Thoroughly mix 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. Heat to 170℃ and stir thoroughly at a rate of 200 r / min for 2 hours to obtain asphalt matrix material.

[0036] Step 2: Add 2 parts antioxidant 1010 and 1 part ultraviolet absorber UV-1164 to the asphalt matrix material, heat to 150℃, stir thoroughly for 3 hours, collect the product after the process, and obtain asphalt. Example

[0037] Preparation of asphalt

[0038] Step 1: Thoroughly mix 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, heat to 175℃, and stir thoroughly at a rate of 250 r / min for 2.5 h to obtain asphalt matrix material.

[0039] Step 2: Add 2.5 parts of antioxidant 1135 and 2 parts of ultraviolet absorber UV-120 to the asphalt matrix material, heat to 155℃, stir thoroughly for 4 hours, collect the product after the process, and obtain asphalt. Example

[0040] Preparation of asphalt

[0041] Step 1: Thoroughly mix 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, heat to 180℃, and stir thoroughly at a rate of 300 r / min for 3 hours to obtain asphalt matrix material.

[0042] Step 2: Add 3 parts antioxidant 168 and 3 parts ultraviolet absorber UV-1164 to the asphalt matrix material, heat to 160℃, stir thoroughly for 5 hours, collect the product after the process, and obtain asphalt.

[0043] Comparative Example 1

[0044] Preparation of asphalt

[0045] Step 1: Thoroughly mix 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, heat to 175℃, and stir thoroughly at a rate of 250 r / min for 2.5 h to obtain asphalt matrix material;

[0046] Step 2: Add 2.5 parts of antioxidant 1135 and 2 parts of ultraviolet absorber UV-120 to the asphalt matrix material, heat to 155℃, stir thoroughly for 4 hours, collect the product after the process, and obtain asphalt.

[0047] Comparative Example 2

[0048] Preparation of asphalt

[0049] Step 1: Thoroughly mix 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, heat to 175℃, and stir thoroughly at a rate of 250 r / min for 2.5 h to obtain asphalt matrix material;

[0050] Step 2: Add 2.5 parts of antioxidant 1135 and 2 parts of ultraviolet absorber UV-120 to the asphalt matrix material, heat to 155℃, stir thoroughly for 4 hours, collect the product after the process, and obtain asphalt.

[0051] Comparative Example 3

[0052] Preparation of asphalt

[0053] Step 1: Thoroughly mix 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, heat to 175℃, and stir thoroughly at a rate of 250 r / min for 2.5 h to obtain asphalt matrix material.

[0054] Step 2: Add 2.5 parts of antioxidant 1135 and 2 parts of ultraviolet absorber UV-120 to the asphalt matrix material, heat to 155℃, stir thoroughly for 4 hours, collect the product after the process, and obtain asphalt.

[0055] Performance testing

[0056] The asphalt prepared in Examples 1-3 and Comparative Examples 1-4 were used as samples. The softening point of the samples was tested using the ring and ball method according to standard GB / T4507-2014 to determine their high-temperature resistance. The flame retardancy rating of the samples was tested according to UL-94 standard. The dynamic viscosity of the samples at 60℃ was tested according to standard JTG E20-2011. Specific test results are shown in the table below:

[0057]

[0058] As shown in the table above, the samples prepared in Examples 1-3 all exhibit excellent high-temperature resistance, flame retardant effect, and high viscosity. The sample prepared in Comparative Example 1 did not contain a fire retardant compatibilizer, resulting in poor flame retardant performance, and its viscosity and high-temperature resistance were inferior to those of the Examples. The sample prepared in Comparative Example 2 did not contain silicone oil-coated mica powder, resulting in poor high-temperature resistance and lower viscosity than the Examples. The sample prepared in Comparative Example 3 directly contained modified mica powder and a fire retardant compatibilizer, exhibiting excellent flame retardant performance but only average high-temperature resistance, making it difficult to meet the requirements for use in high-temperature environments.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] The above content is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the inventive concept, they should all fall within the protection scope of the present invention.

Claims

1. A high-viscosity, high-temperature resistant asphalt, characterized in that, The raw materials include the following parts by weight: 90-110 parts base bitumen, 10-12 parts fire retardant compatibilizer, 8-10 parts styrene-butadiene-styrene block copolymer, 6-8 parts terpene resin, 5-6 parts silicone oil-coated mica powder, 2-3 parts antioxidant, and 1-3 parts ultraviolet absorber. The preparation method of the fire retardant compatibilizer includes the following steps: The base bitumen was placed in a three-necked flask, heated to 110-120℃, nitrogen gas was introduced, and maleic anhydride, allyl diethyl phosphate and initiator were added. The mixture was stirred thoroughly for 2-3 hours, and the product was collected to obtain the fire retardant compatibilizer.

2. The high-viscosity, 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, high-temperature resistant asphalt according to claim 1, characterized in that, The initiator is either benzoyl peroxide or dicumyl peroxide.

4. The high-viscosity, high-temperature resistant asphalt according to claim 1, characterized in that, The preparation method of the silicone oil-coated mica powder includes the following steps: S1: Place mica powder in deionized water, ultrasonically disperse for 10-12 min, add 2-hydroxy-N,N,N-trimethylethylammonium chloride, heat and stir, filter, wash, dry and collect the product to obtain modified mica powder; S2: Place the modified mica powder in toluene, ultrasonically disperse it for 12-15 min, then add terminal epoxy silicone oil and catalyst, heat to 85-90℃ and react for 5-6 h, filter, wash and dry, and collect the product to obtain silicone oil-coated mica powder.

5. The high-viscosity, high-temperature resistant asphalt according to claim 4, characterized in that, In step S1, the temperature for heating and stirring is 45-55℃, and the time is 4-6 hours.

6. The high-viscosity, high-temperature resistant asphalt according to claim 5, characterized in that, In step S2, the catalyst is boron trifluoride diethyl ether.

7. A method for preparing high-viscosity, high-temperature resistant asphalt as described in claim 1, characterized in that, Includes the following steps: Step 1: Thoroughly mix the base asphalt, fire retardant compatibilizer, styrene-butadiene-styrene block copolymer, terpene resin, and silicone oil-coated mica powder, heat to 170-180℃, and stir thoroughly to obtain the asphalt matrix material. Step 2: Add antioxidants and UV absorbers to the asphalt matrix material, heat to 150-160℃, stir thoroughly for 3-5 hours, collect the product after the process, and obtain asphalt.

8. The method for preparing high-viscosity, high-temperature resistant asphalt according to claim 7, characterized in that, In step one, the stirring rate for thorough stirring is 200-300 r / min, and the time is 2-3 h.

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