Environment-friendly asphalt modifier as well as preparation method and application thereof

Abstract

The invention relates to the technical field of new materials for road construction, in particular to an environment-friendly asphalt modifier and a preparation method and application thereof.The environment-friendly asphalt modifier comprises natural material components, an environment-friendly adhesive, a thickening agent and a surfactant. According to the present invention, the environment-friendly asphalt with characteristics of viscosity, pressure resistance and crack resistance can be prepared, the environmental pollution problem caused by the use of the traditional chemical tackifier can be reduced, the environmental pollution can be reduced, the asphalt modifier can be used in the scenes such as roads, airport runways, parking lots and the like, the durability of the pavement can be significantly improved, and the service life of the pavement can be significantly prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of new materials for road construction, and in particular to an environmentally friendly asphalt improver and a preparation method and application thereof. Background Art

[0002] Asphalt is a common road paving material and is widely used in the construction of transportation facilities such as highways, urban roads and airport runways. Asphalt can play the following roles: Asphalt can effectively prevent moisture from entering the pavement base, extend the life of the pavement, and has excellent waterproof properties; Asphalt has strong adhesion and can bind stones tightly together, providing strong bearing capacity and durability; Asphalt pavement can maintain flexibility within a certain temperature range, adapt to thermal expansion and contraction, and reduce cracking.

[0003] However, the viscosity of asphalt is an important factor affecting its construction weight and pavement durability. Asphalt with insufficient viscosity is prone to problems such as insufficient pavement strength and fatigue cracking. Especially under high temperature and heavy load conditions, asphalt may deform or peel off, affecting the service life of the pavement. Therefore, how to effectively increase the viscosity of asphalt has become a key technical issue in improving pavement performance.

[0004] At present, most of the asphalt viscosity enhancers used in the market are chemical synthetic materials, such as polymer modifiers, rubber powder or chemical additives. Although these traditional enhancers can improve the viscosity and compressive strength of asphalt, they also face the following problems: most of the traditional viscosity enhancers are petroleum-based or chemical products, which are easy to pollute the environment during production, use and disposal; many synthetic materials are difficult to degrade naturally, and the large amount of waste materials generated during road aging or renovation will pose a long-term threat to the environment; petroleum-based products rely on limited petrochemical resources, which is contrary to the global resource shortage and sustainable development needs; some chemical enhancers require specific construction processes and equipment, which increases the cost and difficulty of the project.

[0005] Viscosity enhancers based on natural materials have attracted widespread attention. These materials generally have the following advantages: natural materials such as plant extracts, natural resins or rubbers can not only replace petrochemical-based materials, but also naturally degrade after use, reducing the impact on the environment; after being processed, the enhancement effect of some natural materials is no less than that of traditional chemical enhancers. For example, natural resins have good adhesion and heat resistance, while natural rubber can significantly improve the elasticity and crack resistance of asphalt; natural materials are renewable resources and do not rely on non-renewable petrochemical products, which meets the needs of future sustainable development. Summary of the invention

[0006] In order to solve the problems in the prior art that it is difficult for asphalt to have a balanced viscosity, compression resistance, and crack resistance, and that traditional chemical enhancers cause pollution to the environment, the present invention provides an environmentally friendly asphalt modifier. Adding the asphalt modifier to asphalt can improve the viscosity, compression resistance, and crack resistance of asphalt, and can reduce the use of traditional chemical enhancers and reduce pollution to the environment. The asphalt modifier can be used in scenes such as roads, airport runways, and parking lots, and can significantly improve the durability and service life of the road surface.

[0007] The first aspect of the present invention provides an environmentally friendly asphalt modifier, comprising natural material components, an environmentally friendly binder, a thickener and a surfactant, wherein: The natural material components include, by weight, 25-85 parts of palm extract, 25-85 parts of copal resin, 25-85 parts of dammar resin, 5-10 parts of polyisoprene, 1-5 parts of chloroprene rubber, and 1-5 parts of styrene-butadiene rubber.

[0008] The environmentally friendly adhesive comprises, by weight, 2-20 parts of polyvinyl alcohol, 1-20 parts of polyethylene, 1-20 parts of polylactic acid, 1-20 parts of siloxane, and 1-20 parts of acrylic acid; the siloxane is one or more of phenyl silicone resin, methyl silicone, and silicone diol.

[0009] The thickener comprises, by weight, 0-10 parts of starch, 0-15 parts of guar gum, 1-15 parts of gum arabic, 1-15 parts of sodium hydroxymethylcellulose, 1-15 parts of sodium polyacrylate, and 0-15 parts of hydroxypropyl methylcellulose.

[0010] The surfactant comprises, by weight, 1-52 parts of fatty alcohol polyoxyethylene ether, 0-40 parts of polysorbate, and 0-40 parts of polyoxyethylene.

[0011] Among them, the natural material ingredients contain plant extracts, natural resins and natural rubber. After processing, the natural material ingredients have the properties of improving the adhesion and flexibility of asphalt, and can improve the physical properties of asphalt; the natural material ingredients are degradable, so they will not cause long-term pollution to the environment.

[0012] Preferably, the palm extract is 52 degree palm stearin.

[0013] The environmentally friendly binder of the above composition can increase the viscosity of asphalt and will not release harmful substances when degraded.

[0014] The thickener is made of natural thickening materials, such as plant gum and starch. The use of this type of thickener can not only effectively increase the viscosity of asphalt, but also enhance its toughness and anti-fatigue performance.

[0015] The surfactant used above is an environmentally friendly surfactant, which helps to evenly mix the materials to avoid stratification problems during asphalt processing or construction.

[0016] Preferably, in the above-mentioned environmentally friendly asphalt improver, by weight, the natural material components: environmentally friendly adhesive: thickener: surfactant = (30-55): (25-40): (15-30): 5.

[0017] The above-mentioned environmentally friendly asphalt modifier can be fully mixed with asphalt by optimizing the formula of different natural materials and environmentally friendly polymers to enhance the overall performance of asphalt. Under high temperature conditions, the environmentally friendly binder and thickener in the environmentally friendly asphalt modifier can quickly react with asphalt to form a more stable structure, thereby increasing the viscosity of asphalt.

[0018] The present invention also provides a method for preparing the above-mentioned environmentally friendly asphalt modifier, which comprises weighing raw materials of the environmentally friendly asphalt modifier according to the formula amount, mixing and stirring at a temperature of 40-60° C. and a speed of 200-600 r / min for 2 hours to obtain the asphalt modifier.

[0019] Alternatively, the present invention also provides another method for preparing an environmentally friendly asphalt modifier, comprising the following steps: (1) heating the solvent to 30-60°C and keeping the temperature to obtain a dispersion medium; (2) slowly adding a surfactant to the dispersion medium, wherein the weight ratio of the surfactant to the weight of the dispersion medium is 0.5-2 wt%, and stirring at a low speed of 300 r / min-450 r / min for 10-15 min until the surfactant is completely dissolved; (3) Slowly adding the natural material component, environmentally friendly binder, and thickener to the dispersion medium prepared in step (2) in sequence, wherein the natural material component, environmentally friendly binder, and thickener are solid powder or liquid, and the adding speed is controlled at 1-5 g / min; using a high shear stirrer at a speed of 1000-3000 rpm for shear stirring for 30-60 min; (4) Place the sheared liquid in a constant temperature oil bath at 135-180°C and stir it with an electric stirrer at 500-1500 r / min for 2-10 hours; add a stabilizer during the stirring process to prevent segregation between the components; after stirring, perform ultrasonic treatment at 40-90°C and rated frequency for 10-60 minutes to ensure dispersion uniformity and stability.

[0020] Preferably, the solvent in step (1) is one or more of wax oil, gasoline, diesel, lubricating oil, olive oil, corn oil, soybean oil, deionized water or ethanol.

[0021] Preferably, the stabilizer added in step (4) is one or more of colloidal phosphate stabilizer SAP, polyamide, and sulfur, and the weight of the stabilizer added is 0.1-1 wt% of the total weight of the system.

[0022] The added dispersing medium is co-soluble in the asphalt, so there is no need to remove the dispersing medium when mixing with the asphalt.

[0023] The third aspect of the present invention provides an application of the environmentally friendly asphalt modifier, which is mixed with asphalt for use.

[0024] More specifically, the method of mixing the environmentally friendly asphalt modifier with asphalt comprises the following steps: 1) Place the asphalt in a constant temperature oil bath at 120-180℃ and keep it warm. During the heating process, stir it continuously at a speed of 200-600 r / min to prevent local overheating or agglomeration. The specific heating temperature can be determined within this range according to the type of asphalt and the environmentally friendly asphalt modifier used; 2) slowly adding the environmentally friendly asphalt modifier into the asphalt in step 1); During the addition process, the environmentally friendly asphalt modifier should be evenly distributed to avoid excessive addition in some areas, which may cause uneven mixing and local agglomeration. 3) After the environmentally friendly asphalt modifier is added, high-speed shear stirring is performed at a speed of 2500-5000r / min for 10-60min; High-speed shear mixing helps the environmentally friendly asphalt modifier to be evenly distributed in the asphalt matrix to prevent agglomeration and stratification; 4) At a constant temperature of 135°C, stir at a speed of 450 r / min for 30 min-45 min, then adjust the oil bath setting temperature to 180°C, increase the speed to 750 r / min and stir for 4 h-4.5 h to completely mix the environmentally friendly asphalt modifier and asphalt.

[0025] Preferably, the insulation temperature in step 1) is 135° C., and the weight of the environmentally friendly asphalt modifier added in step 2) is 1-30% of the weight of the asphalt.

[0026] The present invention adopts environmentally friendly adhesive and natural material components to prepare asphalt modifier, which is mixed with asphalt to obtain environmentally friendly asphalt with good viscosity, compression resistance and crack resistance, while reducing environmental pollution caused by the use of traditional chemical tackifiers. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below in conjunction with specific embodiments. These embodiments are only used to illustrate the technical solution of the present invention in more detail and should not be construed as limiting the protection scope of the present invention.

[0028] Unless otherwise specified, all substances and reagents used in the examples are commercially available products.

[0029] The asphalt used is Haiyun 70#A grade road petroleum asphalt.

[0030] The palm extract used was 52% palm stearin.

[0031] Example 1 An environmentally friendly asphalt improver comprises 50 wt% of natural material components, 30 wt% of environmentally friendly binder, 15 wt% of thickener and 5 wt% of surfactant.

[0032] The natural material components include 30 parts of palm extract, 30 parts of copal resin, 30 parts of dammar resin, 6 parts of polyisoprene, 2 parts of chloroprene rubber, and 2 parts of styrene-butadiene rubber; The environmentally friendly adhesive includes 20 parts of polyvinyl alcohol, 20 parts of polyethylene, 20 parts of polylactic acid, 20 parts of phenyl silicone resin, and 20 parts of acrylic acid; The thickener includes 10 parts of guar gum, 10 parts of gum arabic, 10 parts of sodium hydroxymethylcellulose, 10 parts of sodium polyacrylate, and 10 parts of hydroxypropyl methylcellulose; The surfactant comprises 40 parts of fatty alcohol polyoxyethylene ether, 30 parts of polysorbate and 30 parts of polyoxyethylene.

[0033] The preparation method comprises the following steps: weighing the raw materials of the environmentally friendly asphalt modifier according to the formula amount, mixing and stirring at 450 r / min at a temperature of 50° C. for 50 minutes.

[0034] Example 2 An environmentally friendly asphalt improver comprises 45 wt% of natural material components, 35 wt% of environmentally friendly binder, 15 wt% of thickener and 5 wt% of surfactant.

[0035] The natural material components include 30 parts of palm extract, 30 parts of copal resin, 30 parts of dammar resin, 6 parts of polyisoprene, 2 parts of chloroprene rubber, and 2 parts of styrene-butadiene rubber; The environmentally friendly adhesive includes 20 parts of polyvinyl alcohol, 20 parts of polyethylene, 20 parts of polylactic acid, 20 parts of phenyl silicone resin, and 20 parts of acrylic acid; The thickener includes 10 parts of guar gum, 10 parts of gum arabic, 10 parts of sodium hydroxymethylcellulose, 10 parts of sodium polyacrylate, and 10 parts of hydroxypropyl methylcellulose; The surfactant includes 40 parts of fatty alcohol polyoxyethylene ether, 30 parts of polysorbate, and 30 parts of polyoxyethylene.

[0036] The preparation method comprises the following steps: weighing raw materials of the environmentally friendly asphalt modifier according to the formula amount, mixing and stirring at 450 r / min at a temperature of 50° C. for 50 minutes.

[0037] Example 3 An environmentally friendly asphalt improver comprises 40 wt% of natural material components, 40 wt% of environmentally friendly binder, 15 wt% of thickener and 5 wt% of surfactant.

[0038] The natural material components include 30 parts of palm extract, 30 parts of copal resin, 30 parts of dammar resin, 6 parts of polyisoprene, 2 parts of chloroprene rubber, and 2 parts of styrene-butadiene rubber; The environmentally friendly adhesive includes 20 parts of polyvinyl alcohol, 20 parts of polyethylene, 20 parts of polylactic acid, 20 parts of phenyl silicone resin, and 20 parts of acrylic acid; The thickener includes 10 parts of guar gum, 10 parts of gum arabic, 10 parts of sodium hydroxymethylcellulose, 10 parts of sodium polyacrylate, and 10 parts of hydroxypropyl methylcellulose; The surfactant includes 40 parts of fatty alcohol polyoxyethylene ether, 30 parts of polysorbate, and 30 parts of polyoxyethylene.

[0039] The preparation method comprises the following steps: weighing raw materials of the environmentally friendly asphalt modifier according to the formula amount, mixing and stirring at 450 r / min at a temperature of 50° C. for 50 minutes.

[0040] Application Example 1 The environmentally friendly asphalt modifier obtained in Example 1 was mixed with commercially available Haiyun 70#A-grade road petroleum asphalt, and the specific method was as follows.

[0041] 1) Place the asphalt in a constant temperature oil bath at 135°C and keep it warm. Stir it continuously at a speed of 450r / min during the heating process to prevent local overheating or agglomeration. 2) slowly adding the environmentally friendly asphalt modifier to the asphalt in step 1), and the added ratio is shown in Table 1; During the addition process, the environmentally friendly asphalt modifier should be evenly distributed to avoid excessive addition in some areas, which may cause uneven mixing and local agglomeration. 3) After the environmentally friendly asphalt modifier is added, high-speed shear stirring is performed at a speed of 3500r / min for 30 minutes; High-speed shear mixing helps the environmentally friendly asphalt modifier to be evenly distributed in the asphalt matrix to prevent agglomeration and stratification; 4) At a constant temperature of 135°C, stir at a speed of 450 r / min for 30 min, then adjust the oil bath setting temperature to 180°C, increase the speed to 750 r / min and stir for 4 h to completely mix the environmentally friendly asphalt modifier and asphalt.

[0042] Application Example 2 The asphalt mixture is prepared by mixing with asphalt in the same method as in Application Example 1. The difference from Application Example 1 is that the environmentally friendly asphalt modifier obtained in Example 2 replaces the environmentally friendly asphalt modifier in Example 1, and the other steps are the same as in Application Example 1.

[0043] Application Example 3 The asphalt mixture is prepared by mixing with asphalt in the same method as in Application Example 1. The difference from Application Example 1 is that the environmentally friendly asphalt modifier obtained in Example 3 replaces the environmentally friendly asphalt modifier in Example 1, and the other steps are the same as in Application Example 1.

[0044] Experimental Example 1 The asphalt mixture obtained in Application Examples 1-3 was tested, and the test results are shown in Table 1.

[0045] Table 1 Performance test results of asphalt mixtures in application examples 1-3 As shown in Table 1, Haiyun 70#A-grade road petroleum asphalt without asphalt modifier was used as the blank control group. The results showed that the asphalt mixtures of Application Examples 1-3 prepared by the environmentally friendly asphalt modifiers prepared in Examples 1-3, compared with the blank control group, can increase the dynamic viscosity by 49.78%, 43.40% and 29.79%, respectively, and the rotational viscosity by 47.91%, 42.26% and 31.45%, respectively, and have stronger deformation resistance at high temperatures, higher rutting factor, softening point and ductility, lower low-temperature bending creep stiffness modulus, and better compressive resistance and crack resistance.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any equivalent substitutions, modifications, etc. made by technicians in this field without any creative work within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An environmentally friendly asphalt modifier, comprising natural material components, environmentally friendly adhesives, thickeners and surfactants, wherein the natural material components, by weight, comprise 25-85 parts of palm extract, 25-85 parts of copal resin, 25-85 parts of dammar resin, 5-10 parts of polyisoprene, 1-5 parts of chloroprene rubber, and 1-5 parts of styrene-butadiene rubber; The environmentally friendly adhesive comprises, by weight, 2-20 parts of polyvinyl alcohol, 1-20 parts of polyethylene, 1-20 parts of polylactic acid, 1-20 parts of siloxane, and 1-20 parts of acrylic acid; wherein the siloxane is one or more of phenyl silicone resin, methyl silicone, and silicone diol.

2. The environmentally friendly asphalt modifier according to claim 1, characterized in that: The thickener comprises, by weight, 0-10 parts of starch, 0-15 parts of guar gum, 1-15 parts of gum arabic, 1-15 parts of sodium hydroxymethylcellulose, 1-15 parts of sodium polyacrylate, and 0-15 parts of hydroxypropyl methylcellulose; the surfactant comprises, by weight, 1-52 parts of fatty alcohol polyoxyethylene ether, 0-40 parts of polysorbate, and 0-40 parts of polyoxyethylene.

3. The environmentally friendly asphalt modifier according to claim 1, characterized in that: The palm extract is 52-degree palm stearin.

4. The environmentally friendly asphalt modifier according to claim 1, characterized in that: In the environmentally friendly asphalt improver, the natural material components by weight: environmentally friendly binder: thickener: surfactant = (30-55): (25-40): (15-30):

5.

5. The method for preparing the environmentally friendly asphalt modifier according to any one of claims 1 to 4, characterized in that: The raw materials of the environmentally friendly asphalt improver are weighed according to the formula, mixed and stirred at a temperature of 40-60°C and a speed of 200-600r / min for 2h to obtain the product.

6. The use of the environmentally friendly asphalt modifier according to any one of claims 1 to 4, characterized in that: The environmentally friendly asphalt modifier is mixed with asphalt for use.

7. The use of the environmentally friendly asphalt modifier according to claim 6, characterized in that: The method for mixing the environmentally friendly asphalt modifier with asphalt comprises the following steps: 1) Place the asphalt in a constant temperature oil bath at 120-180℃ and keep it warm. During the heating process, stir it continuously at a speed of 200-600r / min to prevent local overheating or agglomeration. 2) slowly adding the environmentally friendly asphalt modifier into the asphalt in step 1); 3) After the environmentally friendly asphalt modifier is added, high-speed shear stirring is performed at a speed of 2500-5000r / min for 10-60min; 4) At a constant temperature of 135°C, stir at a speed of 450 r / min for 30 min-45 min, then adjust the oil bath setting temperature to 180°C, increase the speed to 750 r / min and stir for 4 h-4.5 h to completely mix the environmentally friendly asphalt modifier and asphalt.

8. The use of the environmentally friendly asphalt modifier according to claim 7, characterized in that: The temperature in step 1) is 135° C., and the weight of the environmentally friendly asphalt modifier added in step 2) is 1-30% by weight of the asphalt.

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