Antibacterial asphalt material and preparation method thereof

Abstract

The invention provides an antibacterial asphalt material and a preparation method thereof, and relates to the technical field of asphalt materials. The antibacterial asphalt is prepared from the following raw materials in parts by mass: 52-60 parts of matrix asphalt, 18-23 parts of naphthenic oil, 4-8 parts of an SBS (Styrene Butadiene Styrene) polymer, 4-8 parts of an SBR (Styrene Butadiene Rubber) polymer, 3-6 parts of petroleum resin, 5-10 parts of diatomite and 15-20 parts of an antibacterial agent. According to the novel antibacterial asphalt material disclosed by the invention, the asphalt material is endowed with lasting and good antibacterial property, adhesion, temperature resistance and low-temperature cracking resistance, and the preparation method is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt materials, and in particular to an antibacterial asphalt material and a preparation method thereof. Background Art

[0002] Asphalt is a hydrophobic material and is widely used as a waterproof material in the construction field. Asphalt waterproof materials often need to come into contact with water, especially when laid in moist or humid environments, such as corners and angles that are soaked in water all year round. During long-term immersion, the water body will become eutrophic, causing a large number of bacteria and algae to adhere to the surface of the asphalt waterproof material, causing erosion of the asphalt waterproof material. As the degree of erosion deepens, the asphalt waterproof material will eventually penetrate from top to bottom, causing leakage, affecting the waterproof effect.

[0003] The known antibacterial agents mainly include inorganic antibacterial agents, organic antibacterial agents, etc. Inorganic antibacterial agents often need to be loaded on a carrier by high-temperature roasting to exert their antibacterial effect. Since inorganic antibacterial agents are insoluble in water, they can only exert their antibacterial effect when they come into contact with fungi, and cannot achieve full coverage of the antibacterial effect. Organic antibacterial agents have good water solubility and can be released as they come into contact with water. They can achieve comprehensive antibacterial effects as water flows, and have good antibacterial effects. However, organic antibacterial agents have a low boiling point and poor temperature resistance, and cannot be directly applied to high-temperature asphalt. At present, the application of organic antibacterial agents in building waterproofing is mainly to dissolve them in water and then compound them with coatings or emulsions, thereby avoiding the disadvantage of poor temperature resistance of organic antibacterial agents and achieving good antibacterial effects. However, during the use of paint or emulsion, it is necessary to use a spraying method to spread it on the surface of the building, but the thickness of the spraying is often very thin, only achieving a single-layer, short-term antibacterial effect, and the antibacterial agent in the coating will continue to be lost, and a lasting antibacterial effect cannot be achieved.

[0004] Since asphalt waterproofing materials are organic materials and buildings are inorganic materials, the expansion and contraction caused by temperature changes between the two are different. Especially in a low-temperature environment, the temperature drop will not only cause the adhesion of the asphalt waterproofing materials to decrease, but also the asphalt waterproofing materials will shrink at low temperatures, causing the asphalt waterproofing materials to peel off from the building, affecting the waterproofing effect. This requires that the waterproofing material has sufficient thickness and deformation resistance during use, so that the asphalt waterproofing material can adhere tightly to the surface of the building without peeling or cracking. However, the laying thickness of the asphalt waterproofing material increases, so that the asphalt material must have better temperature resistance, especially for areas coated with inclined angles, it should be ensured that the waterproofing material does not slide or drip, which requires the asphalt material to have good adhesion, temperature resistance and low-temperature crack resistance. Summary of the invention

[0005] Aiming at the waterproofing areas of buildings that are in a humid environment all year round, the present invention has developed a new type of antibacterial asphalt material, which gives the asphalt material long-lasting and good antibacterial properties, adhesion, temperature resistance and low-temperature crack resistance, and the preparation method is simple.

[0006] One of the objects of the present invention is to provide an antibacterial asphalt material.

[0007] The second purpose of the present invention is to provide a method for preparing the antibacterial asphalt material.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0009] In the first aspect, the present invention provides an antibacterial asphalt material, which is prepared from the following raw materials in parts by weight: 52 to 60 parts of base asphalt, 18 to 23 parts of cyclohexane oil, 4 to 8 parts of SBS polymer, 4 to 8 parts of SBR polymer, 3 to 6 parts of petroleum resin, 5 to 10 parts of diatomaceous earth, and 15 to 20 parts of antibacterial agent.

[0010] Preferably, the matrix asphalt is 70A matrix asphalt produced by Sinopec Qilu Branch, which is blended with Kuwait and Shah heavy crude oil at a ratio of 9:1 and obtained by a straight distillation process. Its needle penetration is less than 65 / 0.1mm, the softening point is greater than 47°C, and the elongation at 10°C is greater than 100cm, especially the needle penetration is 63 / 0.1mm, the softening point is 48.5°C, and the elongation at 10°C is 135cm.

[0011] Typical but non-limiting weight fractions of the base asphalt are, for example, 52, 53, 54, 55, 56, 57, 58, 59, or 60 parts by weight.

[0012] The naphthenic oil is a commercially available product, white and transparent, with a flash point greater than 200°C and a kinematic viscosity of 9-11 mm at 100°C. 2 / s, especially the flash point is 215℃, and the kinematic viscosity at 100℃ is 11mm 2 / s.

[0013] Typical but non-limiting mass fractions of the naphthenic oil are, for example, 18, 19, 20, 21, 22, 23 parts.

[0014] Preferably, the SBS polymer is a block copolymer of styrene and butadiene produced by Sinopec Baling Branch, model 1301.

[0015] Typical but non-limiting weight fractions of the SBS polymer are, for example, 4, 5, 6, 7, or 8 parts.

[0016] Preferably, the SBR polymer (polystyrene butadiene copolymer) is SBR1500 produced by Sinopec Qilu Branch, with a combined styrene content of 22.5-24.5, especially 24%.

[0017] Typical but non-limiting weight fractions of the SBR polymer are, for example, 4, 5, 6, 7, or 8 parts.

[0018] Preferably, the petroleum resin is a terpene petroleum resin produced by Ganzhou Taipu New Materials Co., Ltd., and its softening point is greater than or equal to 110°C.

[0019] Typical but not limiting weight fractions of the petroleum resin are, for example, 3, 4, 5, or 6 parts.

[0020] The diatomaceous earth is a commercially available product, 800 mesh, and its SiO2 content is not less than 80%.

[0021] Typical but non-limiting weight fractions of the diatomaceous earth are, for example, 5, 6, 7, 8, 9, or 10 parts by weight.

[0022] The antibacterial agent is water-soluble benzethonium chloride, a commercially available product in powder form, and the content of its effective components is not less than 99%.

[0023] A typical but non-limiting weight fraction of the antibacterial agent is, for example, 20 parts.

[0024] In a second aspect, the present invention provides a method for preparing an antibacterial asphalt material, comprising the following steps:

[0025] (1) taking 100 parts by weight of water, heating it to 50-60° C., then adding 15-20 parts by weight of an antibacterial agent, stirring and completely dissolving it, to obtain an aqueous solution of the antibacterial agent;

[0026] (2) placing 5 to 10 parts by weight of diatomaceous earth in a vacuum oven and drying it at a constant temperature, and after cooling it to room temperature, pouring an aqueous solution of an antibacterial agent into the diatomaceous earth, and immersing it in a vacuum oven, and using a rotary evaporator to dehydrate and filter it to obtain antibacterial diatomaceous earth;

[0027] (3) heating 3 to 6 parts by weight of petroleum resin and 18 to 23 parts by weight of a portion of cyclohexane oil, and then adding the antibacterial diatomaceous earth obtained in step (2) and stirring to obtain material A;

[0028] (4) 18 to 23 parts by mass of the remaining cycloparaffinic oil, 4 to 8 parts by mass of the SBS polymer, 4 to 8 parts by mass of the SBR polymer and 52 to 60 parts by mass of the base asphalt are mixed, heated, stirred and grown, and then the material A obtained in step (3) is added and continued to be stirred to obtain an antibacterial asphalt material.

[0029] In some embodiments, in step (2), the drying temperature is 105±5°C; the immersion temperature is 50±5°C, and the immersion time is 60±5min;

[0030] In some embodiments, in step (3), the mass ratio of petroleum resin to part of naphthenic oil is 1:2;

[0031] In some embodiments, in step (3), the heating temperature is 130±5°C and the heating time is 60±5min;

[0032] In some embodiments, in step (3), the stirring speed is 500±50 r / min, and the stirring time is 20±5 min;

[0033] In some embodiments, in step (4), the heating temperature is 150±5°C and the heating time is 60±5min;

[0034] In some embodiments, in step (4), the stirring speed is 800±50 r / min, the stirring development time is 60±5 min, and the continued stirring time is 15±5 min.

[0035] Specifically, the preparation method of the antibacterial asphalt material comprises the following steps:

[0036] (1) Take 100 parts by weight of deionized water, heat it to 50° C., then add 20 parts by weight of an antibacterial agent, and stir continuously with a glass rod. After the antibacterial agent is completely dissolved, an aqueous solution of the antibacterial agent is obtained, and 3 parts of the aqueous solution are prepared in parallel for standby use;

[0037] (2) placing 5 to 10 parts by weight of diatomaceous earth in a vacuum oven at 105° C. and a vacuum degree of 60 KPa for constant temperature drying for 60 min; after cooling to room temperature, quickly pouring an aqueous solution of an antibacterial agent into the diatomaceous earth, and placing it in a vacuum oven at 50° C. and a vacuum degree of 60 KPa for 60 min, using a rotary evaporator for dehydration and filtration to obtain diatomaceous earth after one treatment, and using it as the raw material for the next treatment; then continuing to repeat the above steps until the diatomaceous earth is impregnated and adsorbed three times to obtain antibacterial diatomaceous earth;

[0038] (3) 3 to 6 parts by weight of petroleum resin and part of cyclohexane oil are mixed in a mass ratio of 1:2 and placed in a 130° C. oven for 60 minutes; after being taken out, the antibacterial diatomaceous earth obtained in step (2) is gradually added at a temperature of 130° C. and a rotation speed of 500 r / min, and stirring is continued for 20 minutes to obtain material A for use;

[0039] (4) The remaining cycloparaffinic oil, 4-8 parts by mass of SBS polymer, 4-8 parts by mass of SBR polymer and 52-60 parts by mass of base asphalt are mixed and placed in an oven at 150°C and kept at the constant temperature for 60 minutes. After being taken out and stirred for 1 hour at a temperature of 150°C and a rotation speed of 800 r / min, material A obtained in step (3) is added and stirred for 15 minutes to obtain an antibacterial asphalt material.

[0040] Beneficial effects:

[0041] The present invention is directed to the waterproof area of ​​buildings in a humid environment all year round, and develops a novel antibacterial asphalt material, which gives the asphalt material lasting, good antibacterial property, adhesion, temperature resistance and low temperature crack resistance, and the preparation method is simple. Because diatomite has a unique void structure and a large specific surface area, diatomite has a strong water absorption rate. First, a vacuum and heating method is adopted to dry and dehydrate diatomite to improve the adsorption capacity of diatomite, increase the adsorption amount of diatomite, ensure that a large amount of antibacterial agents can be adsorbed inside the porous structure of diatomite, and through the repeated preparation process route of vacuum dehydration and adsorption, the adsorption capacity of diatomite to the antibacterial agent can be further increased. Organic benzethonium chloride is adopted as the antibacterial agent, because it has good water solubility, it can be dissolved in water rapidly, and a good bactericidal effect is achieved, but its heat resistance is poor and volatile, and it cannot be directly applied to the field of modified asphalt. Therefore, diatomaceous earth with strong water absorption is used as a carrier, and it is placed in an antibacterial solution containing a certain concentration, so that the diatomaceous earth absorbs and stores the antibacterial agent in the pores inside the diatomaceous earth during the process of absorbing the aqueous solution rich in antibacterial agent, thereby obtaining antibacterial diatomaceous earth rich in antibacterial agent. At the same time, with the help of the strong water absorption of diatomaceous earth itself, the diatomaceous earth asphalt material rich in antibacterial agent can be dissolved in water and released in the pores due to the water absorption of diatomaceous earth, thereby achieving a good antibacterial effect. In addition, diatomaceous earth itself has a large specific surface area, and adding it to asphalt materials can increase the adhesion of asphalt materials and improve the adhesion of asphalt materials.

[0042] Since petroleum resin has good adhesion and viscosity increasing properties, it is applied to asphalt materials as a viscosity increasing agent. As a low-viscosity compatibilizer, cyclohexane oil has good mutual solubility with petroleum resin. Mixing cyclohexane oil and petroleum resin allows petroleum resin to quickly dissolve into cyclohexane oil to form a homogeneous system. At the same time, by utilizing the low viscosity of cyclohexane oil, after mixing with petroleum resin, it can play a diluting role and reduce the viscosity of the system. At a lower temperature, a viscous liquid with fluidity and adhesion can be formed. Adding antibacterial diatomaceous earth to this system, utilizing the dilution effect of cyclohexane oil, the temperature of the dispersed system can be reduced, the fluidity of the dispersed system can be increased, and the antibacterial diatomaceous earth can be quickly and evenly dispersed, avoiding the volatilization of the antibacterial agent caused by high temperature conditions, causing the loss of the antibacterial agent, and further utilizing the adhesion of petroleum resin so that the antibacterial diatomaceous earth is wrapped by petroleum resin, which can further prevent the volatilization of the antibacterial agent in the antibacterial diatomaceous earth. At the same time, petroleum resin and asphalt have good mutual solubility. When it is added to asphalt, the petroleum resin wrapped on the surface of antibacterial diatomaceous earth can be quickly dissolved into the asphalt, so that the petroleum resin on the surface of antibacterial diatomaceous earth is replaced and covered by asphalt material, avoiding the direct contact of antibacterial diatomaceous earth with high-temperature asphalt and causing the volatilization of antibacterial agents; the petroleum resin dissolved in asphalt can not only increase the adhesion of asphalt and prevent peeling between asphalt materials and inorganic building materials, but also improve the high-temperature performance of asphalt.

[0043] The matrix asphalt, cyclohexane oil, SBR and SBS are placed in an oven in advance, and SBR and SBS can fully absorb light oil and swell, which is convenient for the rapid dispersion and dissolution of SBR and SBS. At the same time, the light oil in the system is reduced, which can increase the viscosity of the system, so that the adhesion and temperature resistance of the prepared asphalt material are increased. In addition, SBS, as a polymer, can improve the high-temperature performance of asphalt, and SBR can greatly increase the low-temperature performance of asphalt. The two together improve the low-temperature cracking resistance and high-temperature performance of asphalt materials, preventing the asphalt material from flowing at high temperatures and preventing the asphalt material from peeling off from the building material under low temperature conditions due to the difference in temperature shrinkage characteristics between the asphalt material and the building material.

[0044] The present invention has been described in detail above, but the above embodiments are only illustrative in nature and are not intended to limit the present invention. In addition, this article is not limited by any theory described in the above prior art or invention content or the following examples. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with examples. It should be noted that the following examples are provided for illustrative purposes only and do not constitute a limitation on the scope of protection claimed for the present invention.

[0046] Unless otherwise specified, the raw materials, reagents, methods, etc. used in the examples are conventional raw materials, reagents, methods in the art.

[0047] The raw materials involved in the embodiments and comparative examples are as follows:

[0048] The base asphalt is 70A base asphalt produced by Sinopec Qilu Branch, with a needle penetration of 63 / 0.1mm, a softening point of 48.5℃, and an elongation of 135cm at 10℃;

[0049] Naphthenic oil comes from Shandong Taichang Petrochemical Technology Co., Ltd., with a flash point of 215°C and a kinematic viscosity of 11mm at 100°C. 2 / s;

[0050] SBS polymer comes from 1301 produced by Sinopec Baling Branch;

[0051] The SBR polymer comes from SBR1500 produced by Sinopec Qilu Branch, with a combined styrene content of 24%;

[0052] The petroleum resin is terpene petroleum resin produced by Ganzhou Taipu New Materials Co., Ltd., with a softening point of 110°C;

[0053] Diatomaceous earth was from Lingshou County Kaidun Mineral Products Co., Ltd., 800 mesh;

[0054] The antibacterial agent in the embodiment is water-soluble benzethonium chloride, which comes from AVIC New Materials Co., Ltd. and has a purity of 99%.

[0055] Example 1

[0056] A method for preparing an antibacterial asphalt material comprises the following steps:

[0057] (1) Take 1000 g of deionized water, heat it to 50°C, then add 180 g of antibacterial agent, and stir continuously with a glass rod. After the antibacterial agent is completely dissolved, an antibacterial solution is obtained, and 3 portions are prepared in parallel for later use.

[0058] (2) 70 g of diatomaceous earth is placed in a vacuum oven at 105°C and a vacuum degree of 60 KPa for constant temperature drying for 60 minutes; after cooling to room temperature, the antibacterial solution is quickly poured into the diatomaceous earth, and the diatomaceous earth is placed in a vacuum oven at 50°C and a vacuum degree of 60 KPa for 60 minutes, and a rotary evaporator is used for dehydration and filtration to obtain the diatomaceous earth after one treatment, which is used as the raw material for the next treatment. Then continue to repeat the above steps until the diatomaceous earth is adsorbed and impregnated three times, and the antibacterial diatomaceous earth can be obtained.

[0059] (3) 50 g of petroleum resin and 100 g of cyclohexane oil were mixed and placed in a 130° C. oven and kept at the constant temperature for 60 min. After being taken out, the antibacterial diatomaceous earth of step (2) was gradually added at a temperature of 130° C. and a rotation speed of 500 r / min, and stirring was continued for 20 min. The mixture was set aside.

[0060] (4) The remaining 100 g of cycloalkane oil, 50 g of SBS polymer, 50 g of SBR polymer and 580 g of base asphalt are mixed and placed in an oven at 150°C and kept at the constant temperature for 60 min. After being taken out and stirred for 1 h at a temperature of 150°C and a rotation speed of 800 r / min, the components prepared in step (3) are added and stirred for 15 min to obtain an antibacterial asphalt material.

[0061] Example 2

[0062] A method for preparing an antibacterial asphalt material comprises the following steps:

[0063] (1) Take 1000 g of deionized water, heat it to 50°C, then add 200 g of antibacterial agent, and stir continuously with a glass rod. After the antibacterial agent is completely dissolved, an antibacterial solution is obtained, and 3 portions are prepared in parallel for later use.

[0064] (2) 100 g of diatomaceous earth is placed in a vacuum oven at 105°C and a vacuum degree of 60 KPa for constant temperature drying for 60 minutes; after cooling to room temperature, the antibacterial solution is quickly poured into the diatomaceous earth, and the diatomaceous earth is placed in a vacuum oven at 50°C and a vacuum degree of 60 KPa for 60 minutes, and a rotary evaporator is used for dehydration and filtration to obtain the diatomaceous earth after one treatment, which is used as the raw material for the next treatment. Then continue to repeat the above steps until the diatomaceous earth is adsorbed and impregnated three times, and the antibacterial diatomaceous earth can be obtained.

[0065] (3) 30 g of petroleum resin and 60 g of cyclohexane oil were mixed and placed in a 130° C. oven and kept at the constant temperature for 60 min. After being taken out, the antibacterial diatomaceous earth of step (2) was gradually added at a temperature of 130° C. and a rotation speed of 500 r / min, and stirring was continued for 20 min. The mixture was set aside.

[0066] (4) The remaining 170 g of cycloalkane oil, 80 g of SBS polymer, 40 g of SBR polymer and 520 g of base asphalt are mixed and placed in an oven at 150°C and kept at the constant temperature for 60 min. After being taken out and stirred for 1 h at a temperature of 150°C and a rotation speed of 800 r / min, the components prepared in step (3) are added and stirred for 15 min to obtain an antibacterial asphalt material.

[0067] Example 3

[0068] A method for preparing an antibacterial asphalt material comprises the following steps:

[0069] (1) Take 1000 g of deionized water, heat it to 50°C, then add 150 g of antibacterial agent, and stir continuously with a glass rod. After the antibacterial agent is completely dissolved, an antibacterial solution is obtained, and 3 portions are prepared in parallel for later use.

[0070] (2) 50g of diatomaceous earth is placed in a vacuum oven at 105°C and a vacuum degree of 60Kpa for constant temperature drying for 60 minutes; after cooling to room temperature, the antibacterial solution is quickly poured into the diatomaceous earth, and the diatomaceous earth is placed in a vacuum oven at 50°C and a vacuum degree of 60Kpa for 60 minutes, and a rotary evaporator is used for dehydration and filtration to obtain the diatomaceous earth after one treatment, which is used as the raw material for the next treatment. Then continue to repeat the above steps until the diatomaceous earth is adsorbed and impregnated three times, and the antibacterial diatomaceous earth can be obtained.

[0071] (3) 60 g of petroleum resin and 120 g of cyclohexane oil were mixed and placed in a 130° C. oven and kept at the constant temperature for 60 min. After being taken out, the antibacterial diatomaceous earth of step (2) was gradually added at a temperature of 130° C. and a rotation speed of 500 r / min, and stirring was continued for 20 min. The mixture was set aside.

[0072] (4) The remaining 110 g of cycloalkane oil, 40 g of SBS polymer, 80 g of SBR polymer and 540 g of base asphalt are mixed and placed in an oven at 150°C and kept at the constant temperature for 60 min. After being taken out and stirred for 1 h at a temperature of 150°C and a rotation speed of 800 r / min, the components prepared in step (3) are added and stirred for 15 min to obtain an antibacterial asphalt material.

[0073] Example 4

[0074] A method for preparing an antibacterial asphalt material comprises the following steps:

[0075] (1) Take 1000 g of deionized water, heat it to 50°C, then add 180 g of antibacterial agent, and stir continuously with a glass rod. After the antibacterial agent is completely dissolved, an antibacterial solution is obtained, and 3 portions are prepared in parallel for later use.

[0076] (2) 90g of diatomaceous earth is placed in a vacuum oven at 105°C and a vacuum degree of 60Kpa for constant temperature drying for 60 minutes; after cooling to room temperature, the antibacterial solution is quickly poured into the diatomaceous earth, and the diatomaceous earth is placed in a vacuum oven at 50°C and a vacuum degree of 60Kpa for 60 minutes, and a rotary evaporator is used for dehydration and filtration to obtain the diatomaceous earth after one treatment, which is used as the raw material for the next treatment. Then continue to repeat the above steps until the diatomaceous earth is adsorbed and impregnated three times, and the antibacterial diatomaceous earth can be obtained.

[0077] (3) 30 g of petroleum resin and 60 g of cyclohexane oil were mixed and placed in a 130° C. oven and kept at the constant temperature for 60 min. After being taken out, the antibacterial diatomaceous earth of step (2) was gradually added at a temperature of 130° C. and a rotation speed of 500 r / min, and stirring was continued for 20 min. The mixture was set aside.

[0078] (4) The remaining 120 g of cycloalkane oil, 40 g of SBS polymer, 60 g of SBR polymer and 600 g of base asphalt are mixed and placed in an oven at 150°C and kept at the constant temperature for 60 min. After being taken out and stirred for 1 h at a temperature of 150°C and a rotation speed of 800 r / min, the components prepared in step (3) are added and stirred for 15 min to obtain an antibacterial asphalt material.

[0079] Example 5

[0080] A method for preparing an antibacterial asphalt material comprises the following steps:

[0081] (1) Take 1000 g of deionized water, heat it to 50°C, then add 190 g of antibacterial agent, and stir continuously with a glass rod. After the antibacterial agent is completely dissolved, an antibacterial solution is obtained, and 3 portions are prepared in parallel for later use.

[0082] (2) 80g of diatomaceous earth is placed in a vacuum oven at 105°C and a vacuum degree of 60Kpa for constant temperature drying for 60 minutes; after cooling to room temperature, the antibacterial solution is quickly poured into the diatomaceous earth, and the diatomaceous earth is placed in a vacuum oven at 50°C and a vacuum degree of 60Kpa for 60 minutes, and a rotary evaporator is used for dehydration and filtration to obtain the diatomaceous earth after one treatment, which is used as the raw material for the next treatment. Then continue to repeat the above steps until the diatomaceous earth is adsorbed and impregnated three times, and the antibacterial diatomaceous earth can be obtained.

[0083] (3) 40 g of petroleum resin and 80 g of cyclohexane oil were mixed and placed in a 130° C. oven and kept at the constant temperature for 60 min. After being taken out, the antibacterial diatomaceous earth of step (2) was gradually added at a temperature of 130° C. and a rotation speed of 500 r / min, and stirring was continued for 20 min. The mixture was set aside.

[0084] (4) The remaining 150 g of cycloalkane oil, 60 g of SBS polymer, 40 g of SBR polymer and 550 g of base asphalt are mixed and placed in an oven at 150°C and kept at the constant temperature for 60 min. After being taken out and stirred for 1 h at a temperature of 150°C and a rotation speed of 800 r / min, the components prepared in step (3) are added and stirred for 15 min to obtain an antibacterial asphalt material.

[0085] Comparative Example 1

[0086] The preparation method of this comparative example is the same as that of Example 5, the main difference being that the antibacterial diatomaceous earth is replaced with an equal amount of diatomaceous earth.

[0087] Comparative Example 2

[0088] The preparation method of this comparative example is the same as that of Example 5, the main difference being that no SBS polymer is added.

[0089] Comparative Example 3

[0090] The preparation method of this comparative example is the same as that of Example 5, the main difference being that no SBR polymer is added.

[0091] Comparative Example 4

[0092] The preparation method of this comparative example is the same as that of Example 5, the main difference being that no petroleum resin is added, and the antibacterial diatomaceous earth is directly mixed with cyclohexane oil in step (3).

[0093] Comparative Example 5

[0094] The preparation method of this comparative example is the same as that of Example 5, the main difference being that diatomaceous earth and petroleum resin are not added, and the antibacterial agent is directly added to the asphalt.

[0095] Comparative Example 6

[0096] The preparation method of this comparative example is the same as that of Example 5, the main difference being that in step (2), the diatomaceous earth is not treated, and the antibacterial solution is directly mixed with the diatomaceous earth and dried, which is repeated 3 times.

[0097] Comparative Example 7

[0098] The preparation method of this comparative example is the same as that of Example 5, the main difference being that no SBS polymer and SBR polymer are added.

[0099] Comparative Example 8

[0100] The preparation method of this comparative example is the same as that of Example 5, the main difference being that diatomaceous earth is not added, and the antibacterial agent is directly added to the asphalt.

[0101] Performance Testing:

[0102] (1) Antibacterial properties were tested according to HG / T 3950-2007.

[0103] (2) Low temperature flexibility is measured according to method 13 in GB / T 16777-2008.

[0104] (3) Elongation is determined as follows:

[0105] Two 120mm×50mm×(2~4mm) aluminum plates are butted together along the short sides. The gap between the two aluminum plates shall not be greater than 0.05mm. Then the specimen is hot-melted onto the aluminum plate as required. The coating area between the two aluminum plates is 150mm×50mm and the thickness is (2±0.2)mm. A total of 3 specimens are prepared and cured for 24 hours under standard test conditions. The specimen is clamped in the center of the clamp of the tensile machine. It shall not be twisted or deformed. The value L0 indicated by the pointer of the extension ruler is recorded at this time. The tensile machine is started with a tensile speed of 10mm / min. The specimen is pulled until the crack opens from the edge of the specimen or shrinks to 10mm. The value L1 indicated by the pointer of the extension ruler is recorded at this time, accurate to 1mm. Calculate the elongation: L=L1-L0.

[0106] (4) Heat resistance is measured as follows:

[0107] The sample is hot melt scraped onto an aluminum plate of 120mm×50mm×(2~4mm), with a coating area of ​​100mm×50mm and a thickness of (2±0.2)mm. It is placed under standard test conditions for 24h. The 50mm short side of the specimen is in contact with the lower part of the bracket and placed in a constant temperature electric blast drying oven at a 45° angle to the horizontal plane. The distance between the specimen and the drying oven wall is not less than 50mm, and the center of the specimen should be at the same horizontal position as the probe of the thermometer. The specimen is taken out after being treated for 2h±15min and the surface is observed. Record whether the specimen has any sliding, flowing, or dripping. If there is no such phenomenon, increase the temperature until sliding, flowing, or dripping occurs. Record the temperature at this time, which is the heat resistance of the specimen.

[0108] (5) Low temperature adhesion is measured as follows:

[0109] The sample was coated on an aluminum plate of 120mm×50mm with a coating thickness of 10mm. The test block was placed in a -5℃ refrigerator. After maintaining the constant temperature for 5 hours, the sample was taken out and observed to see whether the asphalt sample and the aluminum plate were peeled off. If no peeling occurred, the temperature was lowered by 1℃ and the constant temperature was maintained for 1 hour. The above steps were repeated until the sample and the aluminum plate were peeled off. The temperature at this time was recorded, which represents the low-temperature adhesion of the material.

[0110] Table 1 Test data of Examples 1 to 5

[0111]

[0112] Table 2 Comparative Examples 1 to 8 Test Data

[0113]

[0114] By comparing the test results of the embodiments and the comparative examples, it can be seen that the antibacterial asphalt material prepared by the present invention and the preparation method thereof can prevent the volatilization of organic antibacterial agents at high temperatures by utilizing the synergistic and interrelated effects among the antibacterial agent, diatomaceous earth and petroleum resin components, thereby solving the problem of poor heat resistance of organic antibacterial agents. At the same time, by utilizing the synergistic effect between the components, the antibacterial asphalt material has good low-temperature flexibility, heat resistance and low-temperature adhesion.

[0115] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may be modified, or some or all of the technical features thereof may be replaced by equivalents, without departing from the spirit and essence of the claims of the present invention; and these modifications or replacements are still within the scope defined by the claims of the present invention.

Claims

1. An antibacterial asphalt material, characterized in that: The invention is prepared from the following raw materials in parts by weight: 52-60 parts of base asphalt, 18-23 parts of cyclohexane oil, 4-8 parts of SBS polymer, 4-8 parts of SBR polymer, 3-6 parts of petroleum resin, 5-10 parts of diatomaceous earth and 15-20 parts of antibacterial agent.

2. The antibacterial asphalt material according to claim 1, characterized in that: The base asphalt has a needle penetration of less than 65 / 0.1 mm, a softening point greater than 47° C., and an elongation at 10° C. greater than 100 cm.

3. The antibacterial asphalt material according to claim 1, characterized in that: The flash point of the naphthenic oil is greater than 200°C, and the kinematic viscosity at 100°C is 9-11 mm 2 / s; The petroleum resin is a terpene petroleum resin, and its softening point is greater than or equal to 110°C.

4. The antibacterial asphalt material according to claim 1, characterized in that: The SBS polymer is a block copolymer of styrene and butadiene produced by Sinopec Baling Branch, model 1301; The SBR polymer is SBR1500 produced by Sinopec Qilu Branch, and the combined styrene content is 22.5-24.5%.

5. The antibacterial asphalt material according to claim 1, characterized in that: The mesh number of the diatomaceous earth is 800 meshes, and the SiO2 content thereof is not less than 80%.

6. The antibacterial asphalt material according to claim 1, characterized in that: The antibacterial agent is water-soluble benzethonium chloride, and the content of its effective components is not less than 99%.

7. A method for preparing the antibacterial asphalt material according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) taking 100 parts by weight of water, heating it to 50-60° C., then adding 15-20 parts by weight of an antibacterial agent, stirring and completely dissolving it, to obtain an aqueous solution of the antibacterial agent; (2) placing 5 to 10 parts by weight of diatomaceous earth in a vacuum oven and drying it at a constant temperature, and after cooling it to room temperature, pouring an aqueous solution of an antibacterial agent into the diatomaceous earth, and immersing it in a vacuum oven, and using a rotary evaporator to dehydrate and filter it to obtain antibacterial diatomaceous earth; (3) heating 3 to 6 parts by weight of petroleum resin and 18 to 23 parts by weight of a portion of cyclohexane oil, and then adding the antibacterial diatomaceous earth obtained in step (2) and stirring to obtain material A; (4) 18 to 23 parts by mass of the remaining cycloparaffinic oil, 4 to 8 parts by mass of the SBS polymer, 4 to 8 parts by mass of the SBR polymer and 52 to 60 parts by mass of the base asphalt are mixed, heated, stirred and grown, and then the material A obtained in step (3) is added and continued to be stirred to obtain an antibacterial asphalt material.

8. The preparation method according to claim 7, characterized in that: In step (2), the drying temperature is 105±5°C; the immersion temperature is 50±5°C, and the immersion time is 60±5min.

9. The preparation method according to claim 7, characterized in that: In step (3), the mass ratio of petroleum resin to part of naphthenic oil is 1:2; In step (3), the heating temperature is 130±5°C and the heating time is 60±5min; In step (3), the stirring speed is 500±50 r / min and the stirring time is 20±5 min.

10. The preparation method according to claim 7, characterized in that: In step (4), the heating temperature is 150±5°C and the heating time is 60±5min; In step (4), the stirring speed is 800±50r / min, the stirring development time is 60±5min, and the continued stirring time is 15±5min.

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