Environment-friendly waste asphalt mixture biological regenerant

Abstract

The invention discloses an environment-friendly waste asphalt mixture biological regenerant. The environment-friendly waste asphalt mixture biological regenerant comprises 60-70 wt% of an oil component, 10-20 wt% of a regeneration component, 4-8 wt% of an activator, 2-8 wt% of a penetrant and 2-5 wt% of a solubilizer, the oil component is composed of waste pine needle oil and waste epoxidized soybean oil. The environment-friendly waste asphalt mixture biological regenerant provided by the invention can improve the colloid structure of regenerated asphalt, enables the regenerated asphalt to recover good performance, has excellent permeability, can greatly improve the low-temperature performance of the waste asphalt mixture (PAP), and ensures good pavement performance of the waste asphalt mixture (PAP).

Description

Technical Field

[0001] The invention belongs to the technical field of asphalt pavement materials and relates to an environmentally friendly waste asphalt mixture bioregeneration agent. Background Art

[0002] Asphalt pavement is the main type of pavement in my country. Due to various environmental factors such as high temperature, rainfall, and ultraviolet radiation, it gradually ages, shortening the service life of the pavement and eventually generating a large amount of waste asphalt mixture. As society pays more and more attention to sustainable development, more and more scholars are focusing on studying how to recycle waste asphalt pavement. By using asphalt regeneration agents, the properties of aged asphalt can be effectively improved, the recycling of waste resources can be promoted, and resource waste can be reduced.

[0003] Pine needle oil is a volatile oil extracted from pine needles. It has good thermal stability and antioxidant properties. Its main components include flavonoids, unsaturated fatty acids and terpenoids. Unsaturated fatty acid components can effectively supplement the light components missing in aged asphalt. The molecular weight and atomic ratio of terpenoids are similar to the saturated components in the four components of asphalt. Antioxidant components such as flavonoids enable pine needle oil to maintain stable properties under thermal oxidative aging conditions and is not easily oxidized and decomposed. It can be seen that waste pine needle oil made from discarded pine needles and used as an aged asphalt regeneration agent has the potential to improve the performance of regenerated asphalt. Summary of the invention

[0004] The purpose of the present invention is to provide an environmentally friendly waste asphalt mixture bioregeneration agent, which can improve the colloidal structure of regenerated asphalt, restore its good performance, have excellent permeability, and can greatly improve the low-temperature performance of waste asphalt mixture (PAP), ensuring its good road performance.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0006] An environmentally friendly waste asphalt mixture bioregeneration agent, comprising the following components by mass percentage:

[0007]

[0008] The oil fraction consists of waste pine needle oil and waste epoxidized soybean oil.

[0009] Furthermore, the mass percentage of the waste pine needle oil and the waste epoxidized soybean oil is 20-50%:50-80%.

[0010] In the present invention, waste pine needle oil is a volatile oil extracted from waste pine needles by steam distillation, and its extraction belongs to conventional process and will not be described here; and waste epoxidized soybean oil is obtained by filtering the residue after frying food oil.

[0011] The present invention uses waste pine needle oil and waste epoxidized soybean oil for compounding to synergistically enhance the regeneration capacity of aged asphalt. Pine needle oil contains a variety of natural active ingredients, such as unsaturated fatty acids, terpene compounds, etc. These ingredients have good permeability and regeneration effects on aged asphalt materials, and have good compatibility with organisms, are not easy to cause rejection reactions, and enhance the biocompatibility and environmental protection of the regeneration agent; while waste epoxidized soybean oil, using its epoxy compounds to react chemically with polar components in materials such as asphalt, improves the thermal stability, weather resistance and mechanical strength of the material; and at the same time, as a plasticizer, improves the flexibility and processing performance of the material.

[0012] Furthermore, the regeneration component is at least one of extracted oil and aromatic oil.

[0013] Furthermore, the activator is at least one of zinc oxide and stearic acid.

[0014] Furthermore, the penetrant is fatty alcohol polyoxyethylene ether, which is a non-ionic surfactant.

[0015] Furthermore, the solubilizer is composed of 55-65 wt % of dioctyl phthalate and 35-45 wt % of polyisobutylene succinimide.

[0016] The preparation method of the bioregeneration agent of the present invention is simple, and only requires mixing, heating and stirring the components.

[0017] The advantages of the present invention are:

[0018] In the present invention, waste pine needle oil contains a variety of natural active ingredients, such as unsaturated fatty acids, terpene compounds, etc. These ingredients have good permeability and regeneration effects on aged asphalt materials, and have good compatibility with organisms, are not easy to cause rejection reactions, and enhance the biocompatibility and environmental protection of the regeneration agent; while waste epoxidized soybean oil uses its epoxide compounds to react chemically with polar components in materials such as asphalt to improve the thermal stability, weather resistance and mechanical strength of the material; at the same time, as a plasticizer, it improves the flexibility and processing properties of the material. Waste pine needle oil and waste epoxidized soybean oil are compounded to synergistically enhance the regeneration ability of aged asphalt.

[0019] Waste pine needle oil and waste epoxidized soybean oil are used as wastes. Through compounding and reuse, it not only reduces environmental pollution, but also realizes the recycling of resources, which has significant economic and environmental benefits.

[0020] The regeneration agent of the present invention can improve the colloidal structure of the regenerated asphalt, restore its good performance, and has excellent permeability, and can greatly improve the low-temperature performance of the waste asphalt mixture, ensuring its good road performance. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the embodiments.

[0022] The waste pine needle oil of the invention is prepared by a steam distillation method, specifically, the dried waste pine needles are crushed by a pulverizer, pine needle powder and distilled water are mixed to prepare a pine needle solution at a material-liquid mass ratio of 1:9, the solution is allowed to stand at room temperature for 12 hours, and then the solution is distilled by a steam distillation method at normal pressure, the oil-water mixture is collected and allowed to stand for 1 day, and then the oil and water are separated by a separatory funnel to obtain the pine needle oil.

[0023] The appearance of pine needle oil is a clear and transparent oily liquid with a flash point of 220°C, a viscosity of 51.36 cSt at 60°C, a density of 0.89 g / ml, and an acid value KOH of 1.12 mg / g.

[0024] The waste epoxy soybean oil of the invention is obtained by filtering the residue after frying the food oil, and the initial epoxy value is not less than 10%.

[0025] Example 1

[0026] The mass percentage of oil in the environmentally friendly waste asphalt mixture bioregeneration agent component of the present invention is 65wt%, the mass percentage of the regeneration component (aromatic oil) is 15wt%, the mass percentage of the activator (zinc oxide) is 8wt%, the mass percentage of the penetrant (fatty alcohol polyoxyethylene ether) is 8wt%, and the mass percentage of the solubilizer (55wt% of dioctyl phthalate and 45wt% of polyisobutylene succinimide) is 4wt%;

[0027] The oil component is composed of 20wt% of waste pine needle oil and 80wt% of waste epoxidized soybean oil.

[0028] The method for preparing the environmentally friendly waste asphalt mixture bioregeneration agent of the present invention comprises the following steps:

[0029] 1) Mix waste pine needle oil, waste epoxidized soybean oil and solubilizer, stir them evenly at 80°C, then add regeneration component, activator and penetrant in sequence, continue stirring and mixing to obtain a mixture;

[0030] 2) Cooling the mixture to 60° C. and stirring for 15 minutes to obtain an environmentally friendly waste asphalt mixture bioregeneration agent.

[0031] Example 2

[0032] The mass percentage of oil in the environmentally friendly waste asphalt mixture bioregeneration agent component of the present invention is 70wt%, the mass percentage of the regeneration component (aromatic oil) is 20wt%, the mass percentage of the activator (zinc oxide) is 4wt%, the mass percentage of the penetrant (fatty alcohol polyoxyethylene ether) is 2wt%, and the mass percentage of the solubilizer (55wt% of dioctyl phthalate and 45wt% of polyisobutylene succinimide) is 4wt%;

[0033] The oil component is composed of 30wt% of waste pine needle oil and 70wt% of waste epoxidized soybean oil.

[0034] Example 3

[0035] The mass percentage of oil in the environmentally friendly waste asphalt mixture bioregeneration agent component of the present invention is 70wt%, the mass percentage of the regeneration component (aromatic oil) is 15wt%, the mass percentage of the activator (zinc oxide) is 5wt%, the mass percentage of the penetrant (fatty alcohol polyoxyethylene ether) is 7wt%, and the mass percentage of the solubilizer (55wt% of dioctyl phthalate and 45wt% of polyisobutylene succinimide) is 3wt%;

[0036] The oil component is composed of 40wt% of waste pine needle oil and 60wt% of waste epoxidized soybean oil.

[0037] Example 4

[0038] The mass percentage of oil in the environmentally friendly waste asphalt mixture bioregeneration agent component of the present invention is 65wt%, the mass percentage of the regeneration component (aromatic oil) is 20wt%, the mass percentage of the activator (zinc oxide) is 6wt%, the mass percentage of the penetrant (fatty alcohol polyoxyethylene ether) is 6wt%, and the mass percentage of the solubilizer (55wt% of dioctyl phthalate and 45wt% of polyisobutylene succinimide) is 3wt%;

[0039] The oil component is composed of 50wt% of waste pine needle oil and 50wt% of waste epoxidized soybean oil.

[0040] Comparative Example 1

[0041] This comparative example is aged asphalt without adding regeneration agent.

[0042] Comparative Example 2

[0043] The mass percentage of oil in the environmentally friendly waste asphalt mixture bioregeneration agent component of the present invention is 65wt%, the mass percentage of the regeneration component (aromatic oil) is 20wt%, the mass percentage of the activator (zinc oxide) is 6wt%, the mass percentage of the penetrant (fatty alcohol polyoxyethylene ether) is 6wt%, and the mass percentage of the solubilizer (55wt% of dioctyl phthalate and 45wt% of polyisobutylene succinimide) is 3wt%;

[0044] The oil fraction consists of 100wt% of waste pine needle oil.

[0045] Comparative Example 3

[0046] The mass percentage of oil in the environmentally friendly waste asphalt mixture bioregeneration agent component of the present invention is 65wt%, the mass percentage of the regeneration component (aromatic oil) is 20wt%, the mass percentage of the activator (zinc oxide) is 6wt%, the mass percentage of the penetrant (fatty alcohol polyoxyethylene ether) is 6wt%, and the mass percentage of the solubilizer (55wt% of dioctyl phthalate and 45wt% of polyisobutylene succinimide) is 3wt%;

[0047] The oil fraction consists of 100 wt % of waste epoxidized soybean oil.

[0048] Comparative Example 4

[0049] The mass percentage of oil in the environmentally friendly waste asphalt mixture bioregeneration agent component of the present invention is 65wt%, the mass percentage of the regeneration component (aromatic oil) is 20wt%, the mass percentage of the activator (zinc oxide) is 6wt%, the mass percentage of the penetrant (fatty alcohol polyoxyethylene ether) is 6wt%, and the mass percentage of the solubilizer (55wt% of dioctyl phthalate and 45wt% of polyisobutylene succinimide) is 3wt%;

[0050] The oil component is composed of 50wt% of waste pine needle oil and 50wt% of edible soybean oil.

[0051] Comparative Example 5

[0052] The mass percentage of oil in the environmentally friendly waste asphalt mixture bioregeneration agent component of the present invention is 65wt%, the mass percentage of the regeneration component (aromatic oil) is 20wt%, the mass percentage of the activator (zinc oxide) is 6wt%, the mass percentage of the penetrant (fatty alcohol polyoxyethylene ether) is 6wt%, and the mass percentage of the solubilizer (55wt% of dioctyl phthalate and 45wt% of polyisobutylene succinimide) is 3wt%;

[0053] The oil component is composed of 50wt% of waste epoxidized soybean oil and 50wt% of edible soybean oil.

[0054] Comparative Example 6

[0055] The regeneration agent used in this comparative example is commercially available, with the brand name ZS-1 type regeneration agent, purchased from Liaoning Longrun Road New Materials Co., Ltd.

[0056] Performance tests were performed on the samples of Examples 1-4 and the samples of Comparative Examples 1-6.

[0057] The test includes penetration, softening point, ductility (low temperature ductility, 5°C), elastic recovery at 5°C and penetration after 3 hours of mixing. The aged asphalt is extracted from the same section and under the same conditions, and the amount of regeneration agent is 6wt% of the mass of the aged asphalt; the aged asphalt penetration test sample is immersed in a container containing the regeneration agent for 3 hours, and then its softening point at 25°C is tested.

[0058] The above test standards shall be strictly implemented in accordance with the "Highway Asphalt Pavement Design Specifications" (JTGD50-2017).

[0059] Table 1 Performance indexes of samples of Examples 1-4 and Comparative Examples 1-6

[0060]

[0061] Table 1 shows the test results of penetration, softening point, low temperature ductility, elastic recovery at 5°C and penetration after 3 hours of miscibility of the example samples and comparative samples of the present invention.

[0062] Comparative Example 1 is the control group. It can be seen from Table 1 that after undergoing film oven aging and 10 days of indoor UV aging, all indicators have obvious changes, among which the low-temperature ductility has dropped sharply, the asphalt has aged and hardened seriously, and the low-temperature ductility has dropped significantly, which obviously does not meet the requirements for asphalt pavement use.

[0063] In Comparative Example 2, when all waste pine needle oil was used, the low-temperature ductility was basically unchanged compared to that of aged asphalt.

[0064] In Comparative Example 3, when all waste epoxidized soybean oil was used, the high temperature performance was significantly reduced.

[0065] In Comparative Examples 4 and 5, when waste pine needle oil and edible soybean oil are compounded or waste epoxidized soybean oil and edible soybean oil are compounded, their low-temperature ductility or high-temperature performance is also not ideal.

[0066] The indicators of Comparative Example 6 (SBS modified asphalt) before and after aging are more stable than those of Comparative Example 1, with a larger increase in needle penetration, but a larger loss in softening point, and the needle penetration recovery is not obvious after miscibility, that is, the penetration effect is weak.

[0067] Compared with comparative examples 1-6, the needle penetration, ductility and elastic recovery test results of the present invention are all relatively ideal, and there is no adverse effect on the softening point; the needle penetration after 3 hours of mixing can reach 95% or more of direct uniform incorporation, and the penetration effect is very obvious, that is, the regeneration agent has a good solubilization effect, and the improvement of the high and low temperature properties of aged asphalt is better than that of commercially available regeneration agents, effectively improving the road performance of regenerated waste asphalt mixtures, and is environmentally friendly and low-cost, with obvious technical advantages, and can provide a new growth point for the recycling of RAP asphalt mixtures.

Claims

1. An environmentally friendly waste asphalt mixture bioregeneration agent, characterized in that: Calculated by mass percentage, it includes the following components: The oil fraction consists of waste pine needle oil and waste epoxidized soybean oil.

2. The environmentally friendly waste asphalt mixture bioregeneration agent according to claim 1, characterized in that: The mass percentage of the waste pine needle oil and the waste epoxidized soybean oil is 20-50%: 50-80%.

3. The environmentally friendly waste asphalt mixture bioregeneration agent according to claim 1, characterized in that: The regeneration component is at least one of extracted oil and aromatic oil.

4. The environmentally friendly waste asphalt mixture bioregeneration agent according to claim 1, characterized in that: The activator is at least one of zinc oxide and stearic acid.

5. The environmentally friendly waste asphalt mixture bioregeneration agent according to claim 1, characterized in that: The penetrant is fatty alcohol polyoxyethylene ether, which is a non-ionic surfactant.

6. The environmentally friendly waste asphalt mixture bioregeneration agent according to claim 1, characterized in that: The solubilizer is composed of 55-65 wt% of dioctyl phthalate and 35-45 wt% of polyisobutylene succinimide.

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