Asphalt-based damping material and method for producing the same

Abstract

The application discloses a bitumen damping material and a preparation method thereof. The bitumen damping material comprises the following components in parts by weight: 100 parts of base bitumen, 1-4 parts of a compatilizer, 3-6 parts of a composite SBS modifier, 5-25 parts of a tackifier, 6-20 parts of biochar powder and 0.3-1.2 parts of a stabilizer. The bitumen damping material has good adhesion, flowability and damping characteristics, and the total emission amount of toxic and harmful smoke is obviously reduced, and the bitumen damping material has good environmental protection.

Description

Technical Field

[0001] This invention relates to an asphalt-based material and its preparation method, specifically to an asphalt-based damping material and its preparation method. Background Technology

[0002] Damping pads are viscoelastic materials applied to the inner surface of a car body, adhering tightly to the steel panels. Their primary functions include shock absorption, noise reduction, and heat insulation. Almost all passenger cars on the market have damping pads installed, such as under the floor, side panels, and trunk, in approximately 8 to 12 locations. Furthermore, damping pads are also used in aerospace vehicles, aircraft, and other machinery requiring vibration and noise reduction. Up to 90% of domestically produced models in the Chinese market, as well as a significant proportion of imported models, use asphalt or asphalt-based damping pad materials. Automakers choosing asphalt-based damping pads can significantly reduce production costs.

[0003] In terms of physicochemical properties, all components of asphalt are high molecular weight compounds with relatively high boiling points. Structurally, it can maintain a network structure with considerable cross-linking density over a fairly wide temperature range. At 25°C, the viscosity of different types of asphalt can reach 10. 5 ~10 9 Pa . Asphalt fumes exhibit clear colloidal characteristics. However, asphalt-based materials release toxic, harmful, and irritating fumes at high temperatures, polluting the environment and impacting human health. Related studies indicate that asphalt fumes are primarily composed of low- and medium-molecular-weight hydrocarbons and their derivatives, mainly PAHs, nitrogen-containing compounds, and sulfur-containing compounds. These include potent carcinogens such as benzo[a]pyrene and gases with irritating odors such as NH3, H2S, and thiophene. Furthermore, to improve the viscoelastic and damping properties of asphalt-based damping materials, modification of the base asphalt is often necessary. The introduction of additives during this modification process (such as elemental sulfur) further increases the release of toxic and harmful fumes.

[0004] CN1597783B discloses an asphalt-based composite damping material, its preparation method, and its uses. The method uses polymer-modified asphalt as the base material, and then adds appropriate amounts of fillers, flame retardants, damping agents, other additives, and other inorganic fillers. After mixing with water, an asphalt-based composite damping material can be produced. However, this invention does not consider the asphalt fume pollution problem in various stages of production, transportation, and use.

[0005] CN109251545B discloses a high-damping asphalt material for system vibration reduction and its preparation method. The method provides a high-damping asphalt material for system vibration reduction that has both low-temperature sensitivity and high fluidity, large deformation and high adhesion within a certain temperature range. However, the method uses a large proportion of polymer additives, resulting in high cost, and fails to solve the problem of volatile toxic and harmful pollutants during product use.

[0006] In summary, the above methods are costly and complex in preparing asphalt-based damping materials, and they cannot fundamentally solve the problem of volatile toxic and harmful pollutants during product use. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides an asphalt-based damping material and its preparation method. The asphalt-based damping material of this invention exhibits good adhesion, flowability, and damping characteristics, and significantly reduces the total release of toxic and harmful fumes, thus demonstrating good environmental friendliness.

[0008] The first aspect of this invention provides an asphalt-based damping material, comprising the following raw material components by weight:

[0009] Base bitumen: 100 parts;

[0010] Compatibilizer: 1-4 parts, preferably 1.5-3 parts;

[0011] Composite SBS modifier: 3-6 parts, preferably 3-5 parts;

[0012] Tackifier: 5-25 parts, preferably 10-20 parts;

[0013] Biochar powder: 6-20 parts, preferably 8-15 parts;

[0014] Stabilizer: 0.3 to 1.2 parts, preferably 0.4 to 0.8 parts.

[0015] The base asphalt is obtained by blending base asphalt A and base asphalt B.

[0016] The properties of the base bitumen A include: a penetration of 63-70 1 / 10 mm at 25℃, a dynamic viscosity (60℃) of 290-350 Pa·s, a penetration index (PI) of -0.82 to +1.5, and by mass fraction, saturated components of 31.1%-35.6%, aromatic components of 33.5%-36.2%, resins of 33.6%-35.4%, and asphaltenes of 0%-0.6%, preferably 0%-0.45%.

[0017] The properties of the base bitumen B include: a penetration of 60–70 1 / 10 mm at 25°C, a flash point of 241–256°C, a sulfur content of 2.61 wt%–3.65 wt%, and by mass fraction, saturated matter of 26.1%–37.7%, aromatic matter of 20.2%–34.5%, resin of 18.3%–24.8%, and asphaltenes of 21.3%–30.1%, with asphaltenes preferably being 21.3%–26.0%. The residual carbon value is 21 wt%–29 wt%, the nitrogen content is 0.14 wt%–0.61 wt%, the total nickel and vanadium content is 320–365 μg / g, and the condensation index CI is 0.26–0.35.

[0018] The base asphalt A and base asphalt B are mixed and blended at a mass ratio of 1:(0.3~0.4), the blending temperature is 150~160℃, the blending time is 2~4h, and the penetration at 25℃ after blending should be controlled between 85~93 1 / 10mm.

[0019] The base asphalt A can be blast-air asphalt or other asphalt that meets the above properties.

[0020] The base asphalt B can be Tahe asphalt or other asphalt that meets the above properties.

[0021] The compatibilizer is an adhesive obtained through conventional solvent deasphalting processes in the art.

[0022] The compatibilizer has the following properties: kinematic viscosity of 50 mmHg at 100°C. 2 / s~65mm 2 / s, flash point is 206℃~220℃, by mass fraction, saturated fraction accounts for 30%~42%, aromatic fraction accounts for 48%~57%, resin accounts for 8%~13%, asphaltene content is less than 2%; weight average molecular weight is 1990~2140, molecular weight distribution width is 1.6~3.7.

[0023] The composite SBS modifier includes linear SBS modifiers and star-shaped SBS modifiers. The linear SBS modifier accounts for 10% to 30% of the total mass of the composite SBS modifier, and the star-shaped SBS modifier accounts for 70% to 90% of the total mass of the composite SBS modifier.

[0024] The linear SBS modifier has the following properties: a styrene to butadiene mass ratio of 12–20:80–88, and a tensile strength of 280–350 kg / cm². 2 Its elongation at break is 800%–910%, and its Shore hardness is 75±6HA.

[0025] The star-shaped SBS modifier has the following properties: the mass ratio of styrene to butadiene is 35-45:55-65, and the tensile strength is 200-300 kg / cm². 2 Its elongation at break is 720%–800%, and its Shore hardness is 90±5HA.

[0026] The tackifier is a mixture of C5 and C9 petroleum resins, with C5 petroleum resin accounting for 70% to 90% of the total mass of the tackifier and C9 petroleum resin accounting for 10% to 30% of the total mass of the tackifier.

[0027] The C5 petroleum resin has an average number-average molecular weight of 300–2800, preferably 500–2000, a softening point of 60℃–110℃, preferably 65℃–102℃, an ash content of 0.01wt%–0.06wt%, and an acid value of 0.20KOH / g–0.40KOH / g, preferably 0.22KOH / g–0.36KOH / g.

[0028] The C9 petroleum resin has an average number-average molecular weight of 300-3000, preferably 1000-2900, a softening point of 60℃-140℃, preferably 85℃-132℃, an ash content of 0.01wt%-0.05wt%, and an acid value of 0.19KOH / g-0.37KOH / g, preferably 0.19KOH / g-0.33KOH / g.

[0029] The biochar powder is prepared from traditional Chinese medicine residues.

[0030] Specifically, the biochar powder is prepared from traditional Chinese medicine residues through dehydration and drying, primary pulverization, anaerobic carbonization, secondary pulverization, and sieving.

[0031] The source of the herbal medicine residue is not particularly limited. Preferably, the herbal medicine residue, based on the dehydrated and dried dry matter, has a crude fiber content of 15% to 30% of the total mass. The herbal medicine residue, based on the dehydrated and dried dry matter, has an acid detergent fiber content of 25% to 50% of the total mass and a neutral detergent fiber content of 50% to 70% of the total mass. The herbal medicine residue, based on the dehydrated and dried dry matter, has a crude ash content of 5% to 10% of the total mass.

[0032] The biochar powder has an average particle size of 100–180 mesh, preferably 120–160 mesh. The biochar powder has a moisture content of 10%–25%.

[0033] The stabilizer is one or a mixture of several of the following: tetramethylthiuram disulfide, disodium thiodipropionate, disodium octadecyl thiodipropionate, di(tridecyl) thiodipropionate, distearate thiodipropionate, bis(nitroaryl) disulfide, bis(2-nitrophenyl) disulfide, bis(3-nitrophenyl) disulfide, and bis(4-nitrophenyl) disulfide.

[0034] A second aspect of the present invention provides a method for preparing the above-mentioned asphalt-based damping material, comprising:

[0035] (1) Add some of the composite SBS modifier to the compatibilizer, and then shear and develop it for later use;

[0036] (2) Heat the base asphalt to a molten state, add the remaining composite SBS modifier, shear, and after shearing, add the material prepared in step (1) and stir to develop;

[0037] (3) Add a stabilizer to the material obtained in step (2) and continue stirring to develop;

[0038] (4) Add biochar powder and thickener to the material obtained in step (3) and stir to develop the damping material.

[0039] In step (1), the amount of the composite SBS modifier is 30% to 70% of the total weight of the composite SBS modifier, preferably 40% to 65%. The shear rate is 3000 to 5000 r / min, preferably 3000 to 4500 r / min, the shearing time is 40 to 60 min, and the required temperature during shearing is 120℃ to 145℃, preferably 125℃ to 135℃. The development can be done by static development, the development temperature is 130℃ to 145℃, and the development time is 4 h to 8 h.

[0040] In step (2), the base asphalt is heated to a temperature of 130–145°C. Both shearing and agitation are performed under a protective gas atmosphere, preferably an inert gas and / or N2. The shearing rate is 4000–6000 r / min, preferably 4000–5500 r / min, the shearing time is 60–80 min, and the required temperature during shearing is 170–185°C. The agitation speed is 600–800 r / min, the development time is 20–40 min, and the development temperature is 150°C–195°C, preferably 170°C–180°C.

[0041] In step (3), the stabilizer is preferably added in several portions, with an interval of 20 to 40 minutes between each addition; more preferably, it is added slowly in two separate additions. The stirring speed is 600 to 800 r / min, the development time is 4 to 6 hours, and the development temperature is 150°C to 195°C, preferably 175°C to 185°C.

[0042] In step (4), the stirring speed is 600-800 r / min, the development time is 2-4 h, and the development temperature is 170℃-195℃, preferably 180℃-190℃.

[0043] In step (4), the method for preparing the biochar powder includes:

[0044] a. Dehydrate, dry, and pulverize the residue of Chinese medicinal herbs in one step;

[0045] b. Perform anaerobic carbonization on the residue after step a.

[0046] c. Cool the residue after carbonization in step b, pulverize it again, and sieve it to obtain biochar powder.

[0047] Step a can be carried out in a dehydration and drying machine for medicinal residues. The first pulverization involves pulverizing the medicinal residues to 50-80 mesh. The dehydration and drying conditions are not particularly limited, but generally, the moisture content of the medicinal residues after step a should not exceed 20%.

[0048] The anaerobic carbonization described in step b can be carried out in a continuous slag carbonization furnace. The temperature of the anaerobic carbonization is 400-700℃, the heating rate is 8-15℃ / min, the carbonization time is 30-60min, and the anaerobic carbonization process is carried out in an atmosphere of N2 and / or inert gas.

[0049] In step c, cooling simply means cooling to room temperature. After secondary pulverization and sieving, the resulting biochar powder has a mesh size of 120–160 mesh.

[0050] In step c, after sieving, deionized water is evenly sprayed onto the biochar powder so that the final biochar powder has a water content of 10-25 wt%.

[0051] Compared with the prior art, the asphalt-based damping material and its preparation method of the present invention have the following advantages:

[0052] (1) The base asphalt used in this invention is made by blending two base asphalts with special structures. Base asphalt A and base asphalt B have special structures and cannot be modified by SBS alone. However, the blended base asphalt has good compatibility with SBS and can be used to prepare SBS modified asphalt. Moreover, the base asphalt has less sulfide, nitrogen oxide and total hydrocarbon emissions at high temperatures, avoiding the harm of toxic and harmful fumes to the human body during use.

[0053] (2) The stabilizer used in this invention does not contain elemental sulfur, thus avoiding the excessive sulfide content caused by the introduction of elemental sulfur in the conventional asphalt modification process. The stabilizer itself has no unpleasant odor and can play a good cross-linking role in the asphalt modification process. It works synergistically with the compatibilizer used in this invention to enable the SBS modifier to form a stable spatial network structure in the asphalt, thereby improving the viscoelastic and damping properties of the modified asphalt.

[0054] (3) The present invention uses two different petroleum resins in combination. Compared with conventional tackifiers, it can improve the compatibility between tackifiers and asphalt, modifiers, etc., and better increase the adhesion characteristics of materials in different temperature ranges.

[0055] (4) The biochar powder used in this invention ultimately ensures a certain water content, and the pore structure contains a certain amount of moisture. At high temperatures, this can improve the flow characteristics of the material and also serve to insulate against heat. In combination with other components, it can improve the adhesion, flowability, and damping characteristics of the prepared asphalt-based damping material, and significantly reduce the total amount of toxic and harmful fumes released. In addition, the biochar powder used in this invention is derived from traditional Chinese medicine residues, which are non-toxic and harmless. Applying it to the preparation of damping materials avoids the carbon emission problems caused by the combustion of traditional Chinese medicine residues, thus having a good environmental protection effect. On the other hand, traditional Chinese medicine residues are widely available and can be obtained free of charge from traditional Chinese medicine production plants, and a certain amount of carbon emission reduction subsidies can be obtained, which has a certain cost advantage. Detailed Implementation

[0056] The technical solution of the present invention is further described below through embodiments, but these embodiments cannot limit the scope of protection of the present invention, and the percentages involved are mass fractions.

[0057] In this invention, the contents of crude fiber, acid detergent fiber, and neutral detergent fiber in the biochar powder were determined according to the methods of GB / T 6434-2006, NY / T 1459-2007, and GB / T 20806-2006, respectively, using an FT12 fully automatic fiber analyzer. The crude ash content was determined according to the method described in *Zhang LY. Technologies of Feed Analysis and Feed Quality Detection, 2nd Ed. Beijing: Chinese Agricultural University Press, 2003.*

[0058] In this invention, the damping coefficient is tested according to the requirements of "HG / T4384-2012" for automotive damping films. The asphalt fume testing method described in this invention is as follows: 500g of modified asphalt is added to a sealed container and heated at 183℃ for 6 hours to enrich the asphalt fume. After heating, the asphalt fume is collected to examine the emission reduction effect.

[0059] In this invention, conventional indicators such as penetration and softening point are tested in accordance with the requirements of the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering JTG E20-2011".

[0060] Example 1

[0061] (1) Mix 0.5 parts of linear SBS modifier and 1.5 parts of star-shaped SBS modifier (the linear SBS modifier has the following properties: the mass ratio of styrene to butadiene is 20:80, and the tensile strength is 300 kg / cm). 2 The elongation at break is 820%, and the Shore hardness is 75HA. The star-shaped SBS modifier has the following properties: the mass ratio of styrene to butadiene is 40:60, and the tensile strength is 250 kg / cm². 2 (Elongation at break is 750%, Shore hardness is 90HA) 3 parts compatibilizer (resin obtained by solvent deasphalting process, kinematic viscosity at 100℃ is 60mm) were added. 2 The sample has a flash point of 212℃ and, by mass fraction, comprises 33% saturated matter, 56.5% aromatic matter, 10% resin, and 0.5% asphaltenes; its weight-average molecular weight is 2090, and its molecular weight distribution width is 2.7. It was sheared at 135℃ for 50 min at a shear rate of 4000 r / min. After shearing, it was allowed to stand in a 135℃ oven for 6 h for later use.

[0062] (2) 75 parts of Chunfeng asphalt (penetration of 67 1 / 10 mm at 25℃, dynamic viscosity of 325 Pa·s at 60℃, penetration index PI of -0.63, and by mass fraction, saturated content of 31.4%, aromatic content of 34.2%, resin content of 34.2%, and asphaltenes content of 0.2%) and 25 parts of Tahe asphalt (properties shown in Table 1) were mixed at 155℃ for 3 hours with a stirring speed of 300 r / min. After mixing, 0.5 parts of linear SBS modifier and 1.5 parts of star-shaped SBS modifier (properties the same as in step (1)) were added, and the mixture was sheared at high speed for 60 minutes in a N2 atmosphere at 175℃ with a shear rate of 4000 r / min. After shearing, the material prepared in step (1) was added, and the mixture was stirred at 175℃ for 30 minutes with a stirring speed of 600 r / min.

[0063] (3) Slowly add 0.2 parts of tetramethylthiuram disulfide and 0.1 parts of bis(3-nitrophenyl) disulfide to the material in step (2). After 30 minutes, add 0.2 parts of distearate thiodipropionate and 0.1 parts of bis(2-nitrophenyl) disulfide. Each addition should be completed within 10 minutes. After the addition is completed, continue stirring and developing for 4.5 hours. The development temperature is 185℃ and the stirring speed is 800 r / min.

[0064] (4) Preparation of biochar powder: The Chinese herbal medicine residue (containing 18.25% crude fiber, 26.71% acid detergent fiber, 54.37% neutral detergent fiber, and 8.66% crude ash) was dehydrated and dried using a herbal residue dehydrator. After a first crushing process, a Chinese herbal medicine residue with a particle size of 50-80 mesh and a moisture content of 16.4% was obtained. The pre-treated residue was then subjected to anaerobic carbonization in a continuous herbal residue carbonization furnace at a temperature of 600℃, a heating rate of 15℃ / min, and a carbonization time of 50 min, all within an N2 atmosphere. The carbonized residue was cooled and then crushed a second time to obtain biochar powder with a particle size of 120-160 mesh. Deionized water was then evenly sprayed onto the surface of the biochar powder to obtain biochar powder with a final moisture content of 15.4%.

[0065] Ten parts of biochar powder, 11 parts of C5 petroleum resin (softening point 85℃, average molecular weight 1500, ash content 0.02wt%, acid value 0.25KOH / g), and four parts of C9 petroleum resin (softening point 85℃, average molecular weight 2000, ash content 0.03wt%, acid value 0.29KOH / g) were added to the material in step (3). The mixture was stirred and developed at 190℃ for 4 hours at a stirring speed of 600 r / min. The final asphalt-based damping material A1 was obtained.

[0066] Example 2

[0067] (1) Mix 0.3 parts of linear SBS modifier and 1.5 parts of star-shaped SBS modifier (the linear SBS modifier has the following properties: the mass ratio of styrene to butadiene is 20:80, and the tensile strength is 300 kg / cm). 2 The elongation at break is 820%, and the Shore hardness is 75HA. The star-shaped SBS modifier has the following properties: the mass ratio of styrene to butadiene is 40:60, and the tensile strength is 250 kg / cm². 2 (Elongation at break is 750%, Shore hardness is 90HA) 3 parts compatibilizer (resin obtained by solvent deasphalting process, kinematic viscosity at 100℃ is 60mm) were added. 2 The sample has a flash point of 212℃ and, by mass fraction, comprises 33% saturated matter, 56.5% aromatic matter, 10% resin, and 0.5% asphaltenes; its weight-average molecular weight is 2090, and its molecular weight distribution width is 2.7. It was sheared at 135℃ for 50 min at a shear rate of 4000 r / min. After shearing, it was allowed to stand in a 135℃ oven for 6 h for later use.

[0068] (2) 75 parts of Chunfeng asphalt (penetration of 67, dynamic viscosity (60℃) of 325 Pa·s, penetration index PI of -0.63, and by mass fraction, saturated content of 31.4%, aromatic content of 34.2%, resin content of 34.2%, and asphaltenes content of 0.2%) and 25 parts of Tahe asphalt (properties shown in Table 1) were mixed at 155℃ for 3 hours with a stirring speed of 300 r / min. After mixing, 0.3 parts of linear SBS modifier and 1.5 parts of star-shaped SBS modifier (properties the same as in step (1)) were added, and the mixture was sheared at high speed for 60 minutes in a N2 atmosphere at 175℃ with a shear rate of 4000 r / min. After shearing, the material prepared in step (1) was added, and the mixture was stirred at 175℃ for 30 minutes with a stirring speed of 600 r / min.

[0069] (3) Slowly add 0.2 parts of tetramethylthiuram disulfide and 0.1 parts of bis(3-nitrophenyl) disulfide to the material in step (2). After 30 minutes, add 0.2 parts of distearate thiodipropionate and 0.1 parts of bis(2-nitrophenyl) disulfide. Each addition should be completed within 10 minutes. After the addition is completed, continue stirring and developing for 4.5 hours. The development temperature is 185℃ and the stirring speed is 800 r / min.

[0070] (4) Add 8 parts of biochar powder (preparation method as in Example 1), 14 parts of C5 petroleum resin (softening point 85℃, average number-average molecular weight 1500, ash content 0.02wt%, acid value 0.25KOH / g), and 6 parts of C9 petroleum resin (softening point 85℃, average number-average molecular weight 2000, ash content 0.03wt%, acid value 0.29KOH / g) to the material from step (3). Stir and develop at 190℃ for 4 hours at a stirring speed of 600 r / min. Finally, asphalt-based damping material A2 is obtained.

[0071] Example 3

[0072] (1) Mix 0.5 parts of linear SBS modifier and 1.5 parts of star-shaped SBS modifier (the linear SBS modifier has the following properties: the mass ratio of styrene to butadiene is 20:80, and the tensile strength is 300 kg / cm). 2 The elongation at break is 820%, and the Shore hardness is 75HA. The star-shaped SBS modifier has the following properties: the mass ratio of styrene to butadiene is 40:60, and the tensile strength is 250 kg / cm². 2 (Elongation at break is 750%, Shore hardness is 90HA) 3 parts compatibilizer (resin obtained by solvent deasphalting process, kinematic viscosity at 100℃ is 60mm) were added. 2 The sample has a flash point of 212℃ and, by mass fraction, comprises 33% saturated matter, 56.5% aromatic matter, 10% resin, and 0.5% asphaltenes; its weight-average molecular weight is 2090, and its molecular weight distribution width is 2.7. It was sheared at 135℃ for 50 min at a shear rate of 4000 r / min. After shearing, it was allowed to stand in a 135℃ oven for 6 h for later use.

[0073] (2) 73 parts of Chunfeng asphalt (penetration of 67, dynamic viscosity (60℃) of 325 Pa·s, penetration index PI of -0.63, and by mass fraction, saturated content of 31.4%, aromatic content of 34.2%, resin content of 34.2%, and asphaltenes content of 0.2%) and 27 parts of Tahe asphalt (properties shown in Table 1) were mixed at 160℃ for 3 hours with a stirring speed of 300 r / min. After mixing, 0.5 parts of linear SBS modifier and 1.5 parts of star-shaped SBS modifier (properties the same as in step (1)) were added, and the mixture was sheared at high speed for 60 minutes in a N2 atmosphere at 175℃ with a shear rate of 4000 r / min. After shearing, the material prepared in step (1) was added, and the mixture was stirred at 175℃ for 30 minutes with a stirring speed of 600 r / min.

[0074] (3) Slowly add 0.2 parts of tetramethylthiuram disulfide and 0.1 parts of bis(4-nitrophenyl) disulfide to the material in step (2). After 30 minutes, add 0.2 parts of distearate thiodipropionate and 0.1 parts of bis(4-nitrophenyl) disulfide. Each addition should be completed within 10 minutes. After the addition is completed, continue stirring and developing for 5 hours. The development temperature is 185℃ and the stirring speed is 800r / min.

[0075] (4) Add 12 parts of biochar powder (preparation method as in Example 1), 11 parts of C5 petroleum resin (softening point 85℃, average number-average molecular weight 1500, ash content 0.02wt%, acid value 0.25KOH / g), and 4 parts of C9 petroleum resin (softening point 85℃, average number-average molecular weight 2000, ash content 0.03wt%, acid value 0.29KOH / g) to the material from step (3). Stir and develop at 185℃ for 4 hours at a stirring speed of 600 r / min. Finally, asphalt-based damping material A3 is obtained.

[0076] Example 4

[0077] (1) Mix 0.5 parts of linear SBS modifier and 2 parts of star-shaped SBS modifier (the linear SBS modifier has the following properties: the mass ratio of styrene to butadiene is 20:80, and the tensile strength is 300 kg / cm). 2 The elongation at break is 820%, and the Shore hardness is 75HA. The star-shaped SBS modifier has the following properties: the mass ratio of styrene to butadiene is 40:60, and the tensile strength is 250 kg / cm². 2 (Elongation at break is 750%, Shore hardness is 90HA) 3 parts compatibilizer (resin obtained by solvent deasphalting process, kinematic viscosity at 100℃ is 60mm) were added. 2 The sample has a flash point of 212℃ and, by mass fraction, comprises 33% saturated matter, 56.5% aromatic matter, 10% resin, and 0.5% asphaltenes; its weight-average molecular weight is 2090, and its molecular weight distribution width is 2.7. It was sheared at 135℃ for 50 min at a shear rate of 4000 r / min. After shearing, it was allowed to stand in a 135℃ oven for 6 h for later use.

[0078] (2) 72 parts of Chunfeng asphalt (penetration of 67, dynamic viscosity (60℃) of 325 Pa·s, penetration index PI of -0.63, and by mass fraction, saturated content of 31.4%, aromatic content of 34.2%, resin content of 34.2%, and asphaltenes content of 0.2%) and 28 parts of Tahe asphalt (properties shown in Table 1) were mixed at 155℃ for 3 hours with a stirring speed of 300 r / min. After mixing, 0.5 parts of linear SBS modifier and 2 parts of star-shaped SBS modifier (properties the same as in step (1)) were added, and the mixture was sheared at high speed for 60 minutes in a N2 atmosphere at 175℃ with a shear rate of 4000 r / min. After shearing, the material prepared in step (1) was added, and the mixture was stirred at 175℃ for 30 minutes with a stirring speed of 600 r / min.

[0079] (3) Slowly add 0.25 parts of tetramethylthiuram disulfide and 0.1 parts of bis(3-nitrophenyl) disulfide to the material in step (2). After 30 minutes, add 0.2 parts of distearate thiodipropionate and 0.15 parts of bis(2-nitrophenyl) disulfide. Each addition should be completed within 10 minutes. After the addition is completed, continue stirring and developing for 4.5 hours. The development temperature is 185℃ and the stirring speed is 800 r / min.

[0080] (4) Preparation of biochar powder: The Chinese herbal medicine residue (containing 19.31% crude fiber, 25.94% acid detergent fiber, 56.72% neutral detergent fiber, and 8.33% crude ash) was dehydrated and dried using a residue dehydrator. After a first crushing process, a Chinese herbal medicine residue with a particle size of 50-80 mesh and a moisture content of 16.1% was obtained. The pre-treated residue was then subjected to anaerobic carbonization in a continuous residue carbonization furnace at a carbonization temperature of 620℃, a heating rate of 15℃ / min, and a carbonization time of 40 min, all within an N2 atmosphere. The carbonized residue was cooled and then crushed a second time to obtain biochar powder with a particle size of 120-160 mesh. Deionized water was uniformly sprayed onto the surface of the biochar powder to obtain biochar powder with a final moisture content of 18.2%.

[0081] Ten parts of biochar powder, 11 parts of C5 petroleum resin (softening point 85℃, average molecular weight 1500, ash content 0.02wt%, acid value 0.25KOH / g), and four parts of C9 petroleum resin (softening point 85℃, average molecular weight 2000, ash content 0.03wt%, acid value 0.29KOH / g) were added to the material in step (3). The mixture was stirred and developed at 190℃ for 4 hours at a stirring speed of 600 r / min. The final asphalt-based damping material A4 was obtained.

[0082] Comparative Example 1

[0083] Same as Example 1, except that all the star-shaped SBS modifiers are replaced with linear SBS modifiers of the same mass (with the same properties as the linear SBS modifier in Example 1), to obtain the final asphalt-based damping material B1.

[0084] Comparative Example 2

[0085] Same as Example 1, except that all the linear SBS modifiers are replaced with star-shaped SBS modifiers of the same mass (with the same properties as the star-shaped SBS modifier in Example 1), to obtain the final asphalt-based damping material B2.

[0086] Comparative Example 3

[0087] Same as Example 1, except that the stabilizer is replaced with 0.2 parts of elemental sulfur, to obtain the final asphalt-based damping material B3.

[0088] Comparative Example 4

[0089] Same as Example 1, except that the blended matrix asphalt (75 parts of Chunfeng asphalt and 25 parts of Tahe asphalt) is replaced with the same weight parts of ordinary 90A asphalt, to obtain the final asphalt-based damping material B4.

[0090] Comparative Example 5

[0091] Same as Example 1, except that biochar powder is not added during the preparation process, to obtain the final asphalt-based damping material B5.

[0092] Comparative Example 6

[0093] Same as Example 1, except that the tackifier is not added during the preparation process, to obtain the final asphalt-based damping material B6.

[0094] Test Example

[0095] The main properties and flue gas release conditions of the asphalt-based damping materials obtained in the examples and comparative examples were tested. The specific test results are shown in Tables 2 - 3.

[0096] Table 1 Properties of Tahe asphalt used in examples and comparative examples

[0097]

[0098]

[0099] Table 2 Main properties of asphalt-based damping materials obtained in examples and comparative examples

[0100] serial number 25℃ penetration / 0.1mm 0℃ damping coefficient Damping coefficient at 20℃ Damping coefficient at 40℃ A1 49 0.08 0.15 0.10 A2 50 0.08 0.14 0.10 A3 49 0.09 0.15 0.11 A4 47 0.11 0.18 0.12 B1 52 0.05 0.10 0.06 B2 47 0.07 0.12 0.09 B3 46 0.08 0.12 0.05 B4 48 0.06 0.09 0.07 B5 52 0.04 0.08 0.05 B6 53 0.04 0.09 0.04

[0101] Table 3 Flue gas release conditions of asphalt-based damping materials obtained in examples and comparative examples

[0102]

[0103]

[0104] The protection scope of the present invention is not limited by the above embodiments, but is defined by the claims. Those skilled in the art can make appropriate changes to these embodiments without departing from the technical idea and gist of the present invention, and these changed embodiments are also included in the protection scope of the present invention.

Claims

1. An asphalt-based damping material, characterized in that, The asphalt-based damping material comprises, by weight, the following raw material components: Base bitumen: 100 parts; Compatibilizer: 1-4 parts, preferably 1.5-3 parts; Composite SBS modifier: 3-6 parts, preferably 3-5 parts; Tackifier: 5-25 parts, preferably 10-20 parts; Biochar powder: 6-20 parts, preferably 8-15 parts; Stabilizer: 0.3 to 1.2 parts, preferably 0.4 to 0.8 parts.

2. The asphalt-based damping material according to claim 1, characterized in that, The base asphalt is obtained by blending base asphalt A and base asphalt B. And / or, the properties of the base bitumen A include: a penetration of 63-70 1 / 10 mm at 25°C, a dynamic viscosity (60°C) of 290-350 Pa·s, a penetration index (PI) of -0.82 to +1.5, and by mass fraction, saturated components of 31.1%-35.6%, aromatic components of 33.5%-36.2%, resins of 33.6%-35.4%, and asphaltenes of 0%-0.6%. And / or, the properties of the base bitumen B include: a penetration of 60-70 1 / 10 mm at 25°C, a flash point of 241-256°C, a sulfur content of 2.61 wt%-3.65 wt%, and by mass fraction, saturated matter of 26.1%-37.7%, aromatic matter of 20.2%-34.5%, resin of 18.3%-24.8%, and asphaltenes of 21.3%-30.1%; a residual carbon value of 21 wt%-29 wt%, a nitrogen content of 0.14 wt%-0.61 wt%, a total nickel and vanadium content of 320-365 μg / g, and a condensation index CI of 0.26-0.35; And / or, the base asphalt A and base asphalt B are mixed and blended at a mass ratio of 1:(0.3~0.4), the blending temperature is 150~160℃, the blending time is 2~4h, and the penetration at 25℃ after blending should be controlled between 85~93 1 / 10mm.

3. The asphalt-based damping material according to claim 1, characterized in that, The compatibilizer has the following properties: kinematic viscosity of 50 mmHg at 100°C. 2 / s~65mm 2 / s, flash point is 206℃~220℃, by mass fraction, saturated fraction accounts for 30%~42%, aromatic fraction accounts for 48%~57%, resin accounts for 8%~13%, asphaltene content is less than 2%; weight average molecular weight is 1990~2140, molecular weight distribution width is 1.6~3.

7.

4. The asphalt-based damping material according to claim 1, characterized in that, The composite SBS modifier includes a linear SBS modifier and a star-shaped SBS modifier; wherein the linear SBS modifier accounts for 10% to 30% of the total mass of the composite SBS modifier, and the star-shaped SBS modifier accounts for 70% to 90% of the total mass of the composite SBS modifier.

5. The asphalt-based damping material according to claim 1, characterized in that, The tackifier is a mixture of C5 and C9 petroleum resins, with C5 petroleum resin accounting for 70% to 90% of the total mass of the tackifier and C9 petroleum resin accounting for 10% to 30% of the total mass of the tackifier.

6. The asphalt-based damping material according to claim 1, characterized in that, The biochar powder is prepared from traditional Chinese medicine residues. Specifically, the biochar powder is prepared from traditional Chinese medicine residues through dehydration and drying, primary pulverization, anaerobic carbonization, secondary pulverization, and sieving.

7. The asphalt-based damping material according to claim 6, characterized in that, The herbal residue, based on the dehydrated and dried dry matter, has a crude fiber content of 15% to 30% of the total mass; the herbal residue, based on the dehydrated and dried dry matter, has an acid detergent fiber content of 25% to 50% of the total mass and a neutral detergent fiber content of 50% to 70% of the total mass; the herbal residue, based on the dehydrated and dried dry matter, has a crude ash content of 5% to 10% of the total mass.

8. The asphalt-based damping material according to claim 1, characterized in that, The average particle size of the biochar powder is 100-180 mesh, preferably 120-160 mesh; the moisture content of the biochar powder is 10%-25%.

9. The asphalt-based damping material according to claim 1, characterized in that, The stabilizer is one or a mixture of several of the following: tetramethylthiuram disulfide, disodium thiodipropionate, disodium octadecyl thiodipropionate, di(tridecyl) thiodipropionate, distearate thiodipropionate, bis(nitroaryl) disulfide, bis(2-nitrophenyl) disulfide, bis(3-nitrophenyl) disulfide, and bis(4-nitrophenyl) disulfide.

10. A method for preparing the asphalt-based damping material according to any one of claims 1-9, comprising: (1) Add some of the composite SBS modifier to the compatibilizer, and then shear and develop it for later use; (2) Heat the base asphalt to a molten state, add the remaining composite SBS modifier, shear, and after shearing, add the material prepared in step (1) and stir to develop; (3) Add a stabilizer to the material obtained in step (2) and continue stirring to develop; (4) Add biochar powder and thickener to the material obtained in step (3) and stir to develop the damping material.

11. The method according to claim 10, characterized in that, In step (1), the amount of the partial composite SBS modifier is 30% to 70% of the total weight of the composite SBS modifier, preferably 40% to 65%; the shear rate is 3000 to 5000 r / min, preferably 3000 to 4500 r / min, the shearing time is 40 to 60 min, the temperature required for shearing is 120℃ to 145℃, preferably 125℃ to 135℃; the development temperature is 130℃ to 145℃, and the development time is 4h to 8h.

12. The method according to claim 10, characterized in that, In step (2), the heating temperature of the base asphalt is 130-145℃; the shearing rate is 4000-6000 r / min, preferably 4000-5500 r / min, the shearing time is 60-80 min, and the required temperature during shearing is 170-185℃; the stirring speed is 600-800 r / min, the development time is 20-40 min, and the development temperature is 150℃-195℃, preferably 170℃-180℃.

13. The method according to claim 10, characterized in that, In step (3), the stabilizer is added in several batches, with an interval of 20 min to 40 min between each addition; more preferably, it is added in two batches; the stirring speed is 600 to 800 r / min, the development time is 4 h to 6 h, and the development temperature is 150℃ to 195℃, preferably 175℃ to 185℃.

14. The method according to claim 10, characterized in that, In step (4), the stirring speed is 600-800 r / min, the development time is 2-4 h, and the development temperature is 170℃-195℃, preferably 180℃-190℃.

15. The method according to claim 10, characterized in that, In step (4), the method for preparing the biochar powder includes: a. Dehydrate, dry, and pulverize the residue of Chinese medicinal herbs in one step; b. Perform anaerobic carbonization on the residue after step a. c. Cool the residue after carbonization in step b, pulverize it again, and sieve it to obtain biochar powder.

16. The method according to claim 15, characterized in that, In step a, the first pulverization refers to pulverizing the Chinese herbal medicine residue to 50-80 mesh; In step b, the temperature of the anaerobic carbonization is 400-700℃, the heating rate is 8-15℃ / min, the carbonization time is 30-60min, and the anaerobic carbonization process is carried out in an atmosphere of N2 and / or inert gas. In step c, after sieving, deionized water is evenly sprayed onto the biochar powder so that the final biochar powder has a water content of 10-25 wt%.

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