Antibacterial light-colored asphalt cement and preparation method thereof

Abstract

The invention provides an antibacterial light-colored asphalt cement and a preparation method thereof, and relates to the technical field of asphalt materials. The anti-bacterial paint is prepared from the following raw materials in parts by mass: 34-41 parts of naphthenic oil, 44-50 parts of petroleum resin, 8-13 parts of an SBS polymer, 2-6 parts of diatomite and 20 parts of an anti-bacterial agent. A traditional black asphalt cement is replaced, the cement asphalt material has the coloring function, the technical requirements for high-temperature performance, low-temperature performance and anti-aging performance are met, the light-color asphalt cement is endowed with the antibacterial function, and the preparation method is simple.

Description

Technical Field

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

[0002] Since traditional asphalt is black, all paved asphalt roads appear black. With the continuous development of road construction, people's demand for functional roads is also increasing. For example, people hope to give the road surface a certain reminder or warning effect at road exits, sidewalks and other areas. Therefore, it is necessary to develop a new type of light-colored asphalt binder, which can be colored as needed to distinguish it from the black asphalt pavement, give the road a certain functionality, and achieve a reminder or warning effect.

[0003] At present, light-colored asphalt binders are mainly made of base oil (naphthenic oil, furfural extracted oil, aromatic oil, etc.), petroleum resin and polymer modifiers. Since base oil is a low-viscosity component and petroleum resin is prone to brittle fracture at low temperatures, the high and low temperature performance of the prepared light-colored binder is poor, so it is necessary to add modifiers to improve the high and low temperature performance of the light-colored binder.

[0004] At the same time, light-colored asphalt binders contain a large amount of base oil. During use, their surface will be attached and eroded by fungi, which not only affects the performance of light-colored asphalt binders, but also makes the color of light-colored asphalt binders darker due to the attachment of fungi. Therefore, it is necessary to give light-colored asphalt binders antibacterial functions. 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 play an antibacterial role. Since inorganic antibacterial agents are insoluble in water, they can only play an antibacterial role when they come into contact with fungi, and cannot achieve full coverage of antibacterial effects. Organic antibacterial agents have good water solubility and can be released with contact with water. They can achieve comprehensive antibacterial effects with water flow and have good antibacterial effects. However, organic antibacterial agents have low boiling points and poor temperature resistance, and cannot be directly applied to high-temperature asphalt. At present, the application of organic antimicrobial 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 antimicrobial agents and achieving good antimicrobial effects. However, during the use of coatings or emulsions, they need to be sprayed, and the thickness of the spraying is limited. After the spraying is completed, it is necessary to wait for the water to evaporate. If the thickness of the one-time spraying is too large, the internal water will not evaporate, affecting its performance. Summary of the invention

[0005] The present invention develops a new type of antibacterial light-colored asphalt binder to replace the traditional black asphalt binder, so that the binder asphalt material has a coloring function, meets the technical requirements of high temperature performance, low temperature performance and anti-aging performance, and gives the light-colored asphalt binder an antibacterial function, and the preparation method is simple.

[0006] One of the purposes of the present invention is to provide an antibacterial light-colored asphalt binder.

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

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

[0009] In a first aspect, the present invention provides an antibacterial light-colored asphalt binder, which is prepared from the following raw materials in parts by weight: 34 to 41 parts of cyclohexane oil, 44 to 50 parts of petroleum resin, 8 to 13 parts of SBS polymer, 2 to 6 parts of diatomaceous earth, and 15 to 20 parts of antibacterial agent.

[0010] The naphthenic oil is a commercially available product in the form of a yellow liquid with a flash point of 230°C and a kinematic viscosity of 20 mm at 40°C. 2 / s.

[0011] Typical but non-limiting mass fractions of the naphthenic oil are, for example, 34, 35, 36, 37, 38, 39, 40, 41 parts.

[0012] Preferably, the petroleum resin is a terpene petroleum resin produced by Ganzhou Taipu New Materials Co., Ltd., and its softening point is greater than 110°C.

[0013] Typical but non-limiting weight fractions of the petroleum resin are, for example, 44, 45, 46, 47, 48, 49, or 50 parts by weight.

[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, 8, 9, 10, 11, 12, or 13 parts.

[0016] The diatomaceous earth is a commercially available product, 800 mesh, and its SiO2 content is not less than 80%.

[0017] Typical but non-limiting weight fractions of the diatomaceous earth are, for example, 2, 3, 4, 5, or 6 parts.

[0018] 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%.

[0019] A typical but non-limiting weight fraction of the antibacterial agent is, for example, 20 parts.

[0020] In a second aspect, the present invention provides a method for preparing an antibacterial light-colored asphalt binder, comprising the following steps:

[0021] (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;

[0022] (2) placing 2 to 6 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;

[0023] (3) heating 10 parts by mass of petroleum resin and 15 parts by mass of cyclohexane oil, and then adding the antibacterial diatomaceous earth obtained in step (2) and stirring to obtain material A;

[0024] (4) The remaining 19 to 26 parts by mass of cyclohexane oil, the remaining 34 to 40 parts by mass of petroleum resin and 8 to 13 parts by mass of SBS polymer are mixed, heated and stirred, and then the material A obtained in step (3) is added and stirred continuously to obtain an antibacterial light-colored asphalt binder.

[0025] 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;

[0026] In some embodiments, in step (3), the heating temperature is 130±5°C and the heating time is 60±5min;

[0027] In some embodiments, in step (3), the stirring speed is 500±50 r / min, and the stirring time is 20±5 min;

[0028] In some embodiments, in step (4), the heating temperature is 150±5°C and the heating time is 60±5min;

[0029] In some embodiments, in step (4), the stirring speed is 800±50 r / min, the stirring development time is 30±5 min, and the continued stirring time is 15±5 min.

[0030] Specifically, the preparation method of the antibacterial light-colored asphalt binder comprises the following steps:

[0031] (1) Take 100 parts by weight of deionized water, heat it to 50° C., then add 15 to 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;

[0032] (2) placing 2 to 6 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;

[0033] (3) 10 parts by mass of petroleum resin and 15 parts by mass of cyclohexane oil were mixed and placed in a 130° C. oven and kept at the constant temperature for 60 min; after taking out, the antibacterial diatomaceous earth obtained in 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 to obtain material A for use;

[0034] (4) The remaining 19 to 26 parts by mass of cyclohexane oil, the remaining 34 to 40 parts by mass of petroleum resin and 8 to 13 parts by mass of SBS polymer are mixed and placed in an oven at 150°C and kept at the constant temperature for 60 minutes. After being taken out, the mixture is stirred for 30 minutes at a temperature of 150°C and a rotation speed of 800 r / min. The material A obtained in step (3) is added and stirred for 15 minutes to obtain an antibacterial light-colored asphalt binder.

[0035] Beneficial effects:

[0036] The antibacterial light-colored asphalt binder prepared by the present invention replaces the traditional black asphalt binder, so that the binder asphalt material has a coloring function, meets the technical requirements of high temperature performance, low temperature performance and anti-aging performance, and gives the light-colored asphalt binder antibacterial function, 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, vacuum and heating methods are adopted to dry and dehydrate diatomite to improve the adsorption capacity of diatomite, increase the adsorption amount of diatomite, ensure that the porous structure of diatomite can adsorb a large amount of antibacterial agents, and through the repeated preparation process route of vacuum dehydration and adsorption, the adsorption capacity of diatomite to antibacterial agents can be further increased. Organic benzethonium chloride is used as an antibacterial agent, because it has good water solubility, it can be dissolved in water rapidly, and a good bactericidal effect is obtained, 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 rate 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 rate of the diatomaceous earth itself, the antibacterial agent inside the pores of the diatomaceous earth rich in antibacterial agent can be dissolved in water and released during the process of contacting water due to the water absorption of the diatomaceous earth, thereby achieving a good antibacterial effect.

[0037] Since petroleum resin has good adhesion, it is applied to asphalt materials as a tackifier. As a low-viscosity compatibilizer, cyclohexane oil has good mutual solubility with petroleum resin. Mixing cyclohexane oil and petroleum resin allows the petroleum resin to quickly dissolve into the 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.

[0038] Place cyclohexane oil, SBS and petroleum resin in an oven in advance. Since cyclohexane oil is a low-viscosity light oil, part of it can promote the swelling of SBS, which is convenient for the rapid dispersion and dissolution of SBS, while the other part has a diluting effect on the light-colored binder system to prevent the addition of a large amount of SBS, which causes the system to have a high viscosity at 135°C and difficult construction. As a polymer, SBS can improve the high-temperature and low-temperature properties of light-colored binders, especially the low-temperature ductility at 5°C. In addition, since cyclohexane oil is a light oil that is volatile, and petroleum resin increases its brittleness after high-temperature treatment, the combined effect of the two reduces the anti-aging performance of light-colored binders. The addition of SBS can form a three-dimensional network structure in the light-colored binder, greatly improving the anti-aging performance of the light-colored binder. As a tackifier, petroleum resin has a high softening point, which can increase the viscosity of light-colored binders and improve the high-temperature performance of light-colored binders.

[0039] 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

[0040] 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.

[0041] Unless otherwise specified, the raw materials, reagents, methods, etc. used in the examples are conventional raw materials, reagents, methods in the art.

[0042] The raw materials involved in the embodiments and comparative examples are as follows:

[0043] Naphthenic oil comes from Shandong Yingfeng Petroleum Technology Co., Ltd., with a flash point of 230°C and a kinematic viscosity of 20 mm at 40°C. 2 / s;

[0044] SBS polymer comes from 1301 produced by Sinopec Baling Branch;

[0045] The petroleum resin is terpene petroleum resin produced by Ganzhou Taipu New Materials Co., Ltd., with a softening point of 110°C;

[0046] Diatomaceous earth was from Lingshou County Kaidun Mineral Products Co., Ltd., 800 mesh;

[0047] The antibacterial agent in the embodiment is water-soluble benzethonium chloride from AVIC New Materials Co., Ltd., with a purity of 99%.

[0048] Example 1

[0049] A method for preparing an antibacterial light-colored asphalt binder comprises the following steps:

[0050] (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.

[0051] (2) 50 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 dehydrated and filtered using a rotary evaporator 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.

[0052] (3) 100 g of petroleum resin and 150 g of cyclohexane oil were mixed and placed in a 130°C oven and kept at the constant temperature for 60 min. After taking out, antibacterial diatomaceous earth was 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.

[0053] (4) The remaining 220 g of cyclohexane oil, the remaining 370 g of petroleum resin, and 110 g of SBS polymer were mixed and placed in a 150° C. oven and kept at the constant temperature for 60 min. After being taken out, they were stirred for 30 min at a temperature of 150° C. and a rotation speed of 800 r / min. The components prepared in step (3) were added and stirred for 15 min.

[0054] Example 2

[0055] A method for preparing an antibacterial light-colored asphalt binder comprises the following steps:

[0056] (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.

[0057] (2) 60 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.

[0058] (3) 100 g of petroleum resin and 150 g of cyclohexane oil were mixed and placed in a 130°C oven and kept at the constant temperature for 60 min. After taking out, antibacterial diatomaceous earth was 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.

[0059] (4) The remaining 190 g of cyclohexane oil, the remaining 370 g of petroleum resin, and 130 g of SBS polymer were mixed and placed in a 150° C. oven and kept at the constant temperature for 60 min. After being taken out, they were stirred for 30 min at a temperature of 150° C. and a rotation speed of 800 r / min. The components prepared in step (3) were added and stirred for 15 min.

[0060] Example 3

[0061] A method for preparing an antibacterial light-colored asphalt binder comprises the following steps:

[0062] (1) Take 1000 g of deionized water, heat it to 50°C, then add 170 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.

[0063] (2) 40g 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.

[0064] (3) 100 g of petroleum resin and 150 g of cyclohexane oil were mixed and placed in a 130°C oven and kept at the constant temperature for 60 min. After taking out, antibacterial diatomaceous earth was 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.

[0065] (4) The remaining 230 g of cyclohexane oil, the remaining 400 g of petroleum resin, and 80 g of SBS polymer were mixed and placed in a 150° C. oven and kept at the constant temperature for 60 min. After being taken out, they were stirred for 30 min at a temperature of 150° C. and a rotation speed of 800 r / min. The components prepared in step (3) were added and stirred for 15 min.

[0066] Example 4

[0067] A method for preparing an antibacterial light-colored asphalt binder comprises the following steps:

[0068] (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.

[0069] (2) 20 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.

[0070] (3) 100 g of petroleum resin and 150 g of cyclohexane oil were mixed and placed in a 130° C. oven for 60 min. Antibacterial diatomaceous earth was then added at 130° C. and 500 r / min. The mixture was stirred for 20 min and set aside.

[0071] (4) The remaining 260 g of cyclohexane oil, 380 g of petroleum resin and 90 g of SBS polymer were mixed and placed in a 150° C. oven and kept at the constant temperature for 60 min. After being taken out, they were stirred for 30 min at a temperature of 150° C. and a rotation speed of 800 r / min. The components prepared in step (3) were added and stirred for 15 min.

[0072] Example 5

[0073] A method for preparing an antibacterial light-colored asphalt binder comprises the following steps:

[0074] (1) Take 1000 g of deionized water, heat it to 50°C, then add 170 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.

[0075] (2) 40g 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.

[0076] (3) 100 g of petroleum resin and 150 g of cyclohexane oil were mixed and placed in a 130°C oven and kept at the constant temperature for 60 min. After taking out, antibacterial diatomaceous earth was 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.

[0077] (4) The remaining 250 g of cyclohexane oil, the remaining 340 g of petroleum resin, and 120 g of SBS polymer were mixed and placed in a 150° C. oven and kept at the constant temperature for 60 min. After being taken out, they were stirred for 30 min at a temperature of 150° C. and a rotation speed of 800 r / min. The components prepared in step (3) were added and stirred for 15 min.

[0078] Comparative Example 1

[0079] The preparation method of this comparative example is the same as that of Example 1, the main difference being that the antibacterial diatomaceous earth is replaced with an equal amount of diatomaceous earth.

[0080] Comparative Example 2

[0081] The preparation method of this comparative example is the same as that of Example 1, the main difference being that diatomaceous earth is not added, and the antibacterial agent is directly added to the petroleum resin.

[0082] Comparative Example 3

[0083] The preparation method of this comparative example is the same as that of Example 1, 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 three times.

[0084] Comparative Example 4

[0085] The preparation method of this comparative example is the same as that of Example 1, the main difference being that in step (3), no petroleum resin is added, and only the antibacterial diatomaceous earth and cyclohexane oil are mixed.

[0086] Comparative Example 5

[0087] The preparation method of the comparative example is the same as that of Example 1, the main difference being that SBS is not added.

[0088] Performance Test:

[0089] (1) Needle penetration is measured according to T0604-2011 method.

[0090] (2) The softening point is determined according to T0606-2011 method.

[0091] (3) The rotational viscosity at 135°C was measured according to method T0625-2011.

[0092] (4) The ductility is determined according to the method of T0605-2011.

[0093] (5) Aging is measured according to T0610-2011 method.

[0094]

[0095]

[0096] Table 2 Comparative Examples 1 to 9 Test Data

[0097]

[0098] By comparing the test results of the embodiment and the comparative example, it can be seen that the antibacterial light-colored asphalt binder prepared by the present invention and its preparation method can prevent the volatilization of organic antibacterial agents at high temperatures by utilizing the synergistic and interrelated effects between the antibacterial agent, diatomaceous earth and petroleum resin components, solve the problem of poor heat resistance of organic antibacterial agents, and make the antibacterial light-colored binder have good antibacterial properties. At the same time, by utilizing the synergistic effect between the components, the antibacterial light-colored binder meets the technical requirements of high temperature performance, low temperature performance and anti-aging performance.

[0099] 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 light-colored asphalt binder, characterized in that: The invention is prepared from the following raw materials in parts by weight: 34-41 parts of cyclohexane oil, 44-50 parts of petroleum resin, 8-13 parts of SBS polymer, 2-6 parts of diatomaceous earth and 15-20 parts of antibacterial agent.

2. The antibacterial light-colored asphalt binder according to claim 1, characterized in that: The flash point of the naphthenic oil is greater than 200°C, and the kinematic viscosity at 40°C is 18-20 mm 2 / s.

3. The antibacterial light-colored asphalt binder according to claim 1, characterized in that: The softening point of the petroleum resin is greater than or equal to 110°C.

4. The antibacterial light-colored asphalt binder according to claim 1, characterized in that: The SBS polymer is a block copolymer of styrene and butadiene.

5. The antibacterial light-colored asphalt binder 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 light-colored asphalt binder 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 light-colored asphalt binder 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 2 to 6 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 10 parts by mass of petroleum resin and 15 parts by mass of cyclohexane oil, and then adding the antibacterial diatomaceous earth obtained in step (2) and stirring to obtain material A; (4) The remaining 19 to 26 parts by mass of cyclohexane oil, the remaining 34 to 40 parts by mass of petroleum resin and 8 to 13 parts by mass of SBS polymer are mixed, heated and stirred, and then the material A obtained in step (3) is added and stirred continuously to obtain an antibacterial light-colored asphalt binder.

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 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 30±5min, and the continued stirring time is 15±5min.

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