Asphalt regenerant and application thereof, and regeneration method of waste asphalt

Abstract

The invention provides an asphalt regenerant, application thereof and a regeneration method of waste asphalt, and belongs to the technical field of pavement materials. The asphalt regenerant comprises the following raw materials in parts by mass: 6-12 parts of an epoxy compound, 0.5-2 parts of an adhesion promoter, 2-5 parts of a curing agent and 83-92 parts of a diluent, wherein the epoxy compound comprises polyurethane modified epoxy resin. According to the invention, the flexible epoxy compound polyurethane modified epoxy resin is introduced and acts together with the curing agent, so that the warm mixing effect of the asphalt regenerant at low temperature (110-115 DEG C) is improved, the regeneration effect can be ensured, and meanwhile, the reinforcing and toughening effects can be achieved through curing of the epoxy group; the high-temperature performance, the low-temperature performance, the water stability and the durability of the recycled asphalt mixture can be effectively improved, and the energy consumption and the carbon emission in the production and construction process can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of pavement materials, and in particular to an asphalt regeneration agent and application thereof, and a method for regenerating waste asphalt. Background Art

[0002] During the use of asphalt pavement, asphalt will age and become brittle due to the influence of environmental factors such as light, heat, oxygen, water, and traffic load, thus affecting the function of the pavement. The aging of asphalt is mainly caused by the loss of light components, the crystallization and polymerization of small molecules, and the oxidation of various components. The aging of asphalt will cause the pavement to become dry and brittle, and then cause cracking, looseness and other diseases. The aging of asphalt pavement will lead to the deterioration of pavement function on the one hand, and on the other hand, maintenance will produce a large amount of solid waste that affects the environment. Therefore, how to recycle aged asphalt and asphalt mixtures has become a research hotspot in the field of road traffic.

[0003] The recycling of waste asphalt, in addition to the regeneration and repair of aged asphalt, must also consider the improvement of the road performance of the recycled mixture. In addition, the convenience of the actual use of the regeneration agent must also be considered, such as whether the regeneration agent needs to mix the components evenly on site and the mixing temperature. The related technology discloses a modifier for bio-based recycled asphalt, which introduces a bio-based epoxy compound prepared from natural bio-based materials. It can ensure the regeneration effect while playing a reinforcing role through the curing of the epoxy group, but there is a problem of poor warm mixing effect at low temperatures (110-115°C). Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide an asphalt regeneration agent and its application, and a method for regenerating waste asphalt. The asphalt regeneration agent of the present invention has a good warm mixing effect at low temperature (110-115°C).

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The invention provides an asphalt regeneration agent, comprising the following raw materials in parts by weight: 6 to 12 parts of epoxy compounds, 0.5 to 2 parts of adhesion promoters, 2 to 5 parts of curing agents and 83 to 92 parts of diluents, wherein the epoxy compounds include polyurethane modified epoxy resins.

[0007] Preferably, the epoxy compound further comprises one or more of dimer acid diglycidyl ester, castor oil triglycidyl ether and cardanol glycidyl ether.

[0008] Preferably, the mass fraction of the epoxy compound in the raw material is 6.5 to 10 parts.

[0009] Preferably, the adhesion promoter is a long-chain titanate compound.

[0010] Preferably, the adhesion promoter comprises isopropyl dioleyl (dioctyl phosphate) titanate (HY-101) and / or isopropyl trioleyl titanate (HY-105).

[0011] Preferably, the mass fraction of the adhesion promoter in the raw material is 0.7 to 1.5 parts.

[0012] Preferably, the curing agent comprises polyetheramine and / or a latent curing agent.

[0013] Preferably, the mass fraction of the curing agent in the raw material is 3 to 4.5 parts.

[0014] The present invention also provides the use of the asphalt regeneration agent described in the above technical solution in the field of asphalt regeneration.

[0015] The present invention also provides a method for regenerating waste asphalt, comprising the following steps:

[0016] Crushing the waste asphalt mixture to obtain crushed material;

[0017] The crushed material, the asphalt regeneration agent described in the above technical solution and the base asphalt are mixed to obtain a regenerated asphalt mixture; the mass of the asphalt regeneration agent is 0.3% to 0.6% of the mass of the waste asphalt mixture; the mass of the base asphalt is 0.3% to 0.6% of the mass of the waste asphalt mixture.

[0018] The invention provides an asphalt regeneration agent, comprising the following raw materials in parts by weight: 6 to 12 parts of epoxy compounds, 0.5 to 2 parts of adhesion promoters, 2 to 5 parts of curing agents and 83 to 92 parts of diluents, wherein the epoxy compounds include polyurethane modified epoxy resins.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention improves the warm mixing effect of the asphalt regeneration agent at low temperature (110-115°C) by introducing a flexible epoxy compound polyurethane modified epoxy resin, which works together with a curing agent. It can ensure the regeneration effect while playing a reinforcing and toughening role through the curing of the epoxy group, and can effectively improve the high temperature performance, low temperature performance, water stability and durability of the regenerated asphalt mixture, and can reduce energy consumption and carbon emissions during production and construction.

[0021] Furthermore, the adhesion promoter in the present invention is a long-chain titanate compound, which is a titanate adhesion promoter containing an oleic acid structure. It has both a long carbon chain structure and the characteristics and chemical coupling effect of oil esters, and can enhance the adhesion between asphalt and aggregate, thereby enhancing the mechanical strength of the mixture.

[0022] Furthermore, the present invention can ensure that the asphalt regeneration agent has excellent storage stability by selecting suitable low-activity epoxy compounds (including polyurethane-modified epoxy resin and dimer acid diglycidyl ester) and controlling the dosage of polyetheramine curing agent and latent curing agent. In addition, by introducing components with similar chemical structures to asphalt (including polyether polyol segments in polyurethane-modified epoxy resin, dimer acid structure of dimer acid diglycidyl ester, dimer acid structure and ester group in adhesion promoter, and side chain of diluent cardanol), good compatibility with asphalt is ensured.

[0023] Furthermore, the polyetheramine used in the present invention has an emulsifying effect while curing the epoxy compound, and can emulsify the epoxy compound and asphalt, thereby improving the fluidity of the material, further reducing the mixing temperature, reducing greenhouse gas emissions, preventing aging, and ensuring the degree of compaction and construction quality.

[0024] Furthermore, the asphalt regeneration agent provided by the present invention is easy to use, has a good warm mixing effect, contains only one component, and can be used directly on site after preparation without the need for on-site mixing.

[0025] In summary, the asphalt regeneration agent provided by the present invention can simultaneously meet the requirements of waste asphalt regeneration, performance improvement, environmental protection and easy use, can effectively ensure the good quality of recycled asphalt mixture, and has broad application prospects. DETAILED DESCRIPTION

[0026] The invention provides an asphalt regeneration agent, comprising the following raw materials in parts by weight: 6 to 12 parts of epoxy compounds, 0.5 to 2 parts of adhesion promoters, 2 to 5 parts of curing agents and 83 to 92 parts of diluents, wherein the epoxy compounds include polyurethane modified epoxy resins.

[0027] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in the art.

[0028] In the present invention, the polyurethane-modified epoxy resin is preferably polyurethane-modified epoxy resin EPU-133L.

[0029] In the present invention, the epoxy compound further comprises one or more of dimer acid diglycidyl ester, castor oil triglycidyl ether and cardanol glycidyl ether. In a specific embodiment of the present invention, the epoxy compound is preferably a mixture of polyurethane modified epoxy resin EPU-133L, dimer acid diglycidyl ester and cardanol glycidyl ether or a mixture of polyurethane modified epoxy resin EPU-133L and cardanol glycidyl ether. The mass ratio of polyurethane modified epoxy resin EPU-133L, dimer acid diglycidyl ester and cardanol glycidyl ether in the mixture of polyurethane modified epoxy resin EPU-133L, dimer acid diglycidyl ester and cardanol glycidyl ether is preferably 7:1:2 or 4:2:2. The mass ratio of polyurethane modified epoxy resin EPU-133L and cardanol glycidyl ether in the mixture of ester modified epoxy resin EPU-133L and cardanol glycidyl ether is preferably 3:5.3 or 1:1.5; the polyurethane modified epoxy resin EPU-133L and dimer acid diglycidyl ester are used in combination with a curing agent, which can ensure the regeneration effect while playing a reinforcing and toughening role through the curing of the epoxy group, and work together with the curing agent to improve the warm mixing effect of the asphalt regeneration agent at low temperature (110-115°C), and can effectively improve the high temperature performance and low temperature performance of the regenerated asphalt mixture.

[0030] In the present invention, the mass parts of the epoxy compound in the raw material is preferably 6.5 to 10, specifically 6, 6.5, 8, 8.3, 10 or 12 parts.

[0031] In the present invention, the adhesion promoter is preferably a long-chain titanate compound, more preferably includes isopropyl dioleyl (dioctyl phosphate) titanate and / or isopropyl trioleyl titanate. The long-chain titanate compound has an ester group in addition to the long chain, and has better compatibility with asphalt.

[0032] Based on the mass of the epoxy compound, the mass proportion of the adhesion promoter in the raw material is preferably 0.7 to 1.5, specifically 0.7, 1.2 or 1.5 parts.

[0033] Based on the mass of the epoxy compound, the mass proportion of the curing agent in the raw material is preferably 3 to 4.5, specifically 3, 3.3, 4.2 or 4.3 parts.

[0034] In the present invention, the curing agent preferably includes polyetheramine and / or latent curing agent; the polyetheramine preferably includes one or more of monoamine polyetheramine, diamine polyetheramine and triamine polyetheramine, and the latent curing agent is preferably a boroalkyl tertiary amine curing agent 594; the monoamine polyetheramine has an emulsifying effect while curing the epoxy compound, and can emulsify the epoxy compound and asphalt, and work together with the epoxy compound to improve the fluidity of the material, further reduce the mixing temperature, reduce greenhouse gas emissions, prevent aging, and ensure the degree of compaction and construction quality.

[0035] In the present invention, the monoamine-based polyetheramine preferably includes ZM-160 and ZM-1100.

[0036] In a specific embodiment of the present invention, the curing agent is preferably a mixture of ZM-160, ZM-1100 and a borax tertiary amine curing agent 594, and the mass ratio of ZM-160, ZM-1100 and a borax tertiary amine curing agent 594 in the mixture is preferably 1-2:2-3:0.2-0.3, specifically 1:3:0.3, 1:2:0.3 or 2:2:0.2; in another specific embodiment of the present invention, the curing agent is preferably a mixture of ZM-1100 and a borax tertiary amine curing agent 594, and the mass ratio of ZM-1100 and a borax tertiary amine curing agent 594 in the mixture is preferably 3:0.3.

[0037] Based on the mass of the epoxy compound, the mass fraction of the diluent in the raw material is preferably 85 to 89.5, specifically 86, 86, 87.5 or 89.5 parts.

[0038] In the present invention, the diluent preferably includes one or more of cashew nut shell oil, cardanol and castor oil. The diluent has a good regeneration effect on aged asphalt, and the used diluent is refined from natural bio-based materials without using volatile toxic or flammable solvents, which is friendly to personnel and the environment.

[0039] The present invention ensures good compatibility with asphalt by introducing components with similar chemical structures to asphalt (including polyether polyol segments in polyurethane-modified epoxy resin, dimer acid structures of dimer acid glycidyl ester, dimer acid structures and ester groups in adhesion promoters, and side chains of diluent cardanol).

[0040] The present invention also provides a method for preparing the asphalt regeneration agent described in the above technical solution, comprising the following steps:

[0041] The epoxy compound, the adhesion promoter, the curing agent and the diluent are mixed to obtain the asphalt regeneration agent. The present invention has no special limitation on the specific mixing method, and a method well known to those skilled in the art can be used.

[0042] The asphalt regeneration agent of the present invention comprises only one component and can be used directly on site after being prepared without the need for on-site mixing.

[0043] The present invention also provides the use of the asphalt regeneration agent described in the above technical solution in the field of asphalt regeneration.

[0044] The present invention also provides a method for regenerating waste asphalt, comprising the following steps:

[0045] Crushing the waste asphalt mixture to obtain crushed material;

[0046] The crushed material, the asphalt regeneration agent described in the above technical solution and the base asphalt are mixed to obtain a regenerated asphalt mixture; the mass of the asphalt regeneration agent is 0.3% to 0.6% of the mass of the waste asphalt mixture; the mass of the base asphalt is 0.3% to 0.6% of the mass of the waste asphalt mixture.

[0047] The invention crushes the waste asphalt mixture to obtain crushed material.

[0048] The present invention preferably crushes the waste asphalt mixture and then screens it to obtain a first crushed material and a second crushed material; the particle size of the first crushed material is preferably 0-8 mm, and the particle size of the second crushed material is preferably 8-26 mm. The particle size range of the first crushed material and the second crushed material is to form a gradation to avoid the problem that the aggregate does not form a good gradation and it is difficult to obtain good road performance.

[0049] The present invention has no particular limitation on the specific method of crushing, and any method well known to those skilled in the art may be used.

[0050] After obtaining the crushed material, the present invention mixes the crushed material, the asphalt regeneration agent described in the above technical solution and the base asphalt to obtain a regenerated asphalt mixture; the mass of the asphalt regeneration agent is 0.3% to 0.6% of the mass of the waste asphalt mixture; the mass of the base asphalt is 0.3% to 0.6% of the mass of the waste asphalt mixture.

[0051] In the present invention, the mass ratio of the first crushed material to the second crushed material is preferably 2:8.

[0052] In the present invention, the mass of the asphalt regeneration agent can specifically be 0.3%, 0.4%, 0.5% or 0.6% of the mass of the waste asphalt mixture.

[0053] In the present invention, the mass of the matrix asphalt may specifically be 0.3%, 0.4%, 0.5% or 0.6% of the mass of the waste asphalt mixture.

[0054] In the present invention, the base asphalt is preferably 70# base asphalt.

[0055] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] Example 1

[0057] Asphalt regeneration agent is composed of the following raw materials in parts by mass:

[0058]

[0059] The preparation method is as follows:

[0060] According to the above dosage relationship, polyurethane modified epoxy resin EPU-133L, dimer acid diglycidyl ester, cardanol glycidyl ether, adhesion promoter HY-101, monoamino polyether amine ZM-160, ZM-1100, curing agent 594, and cardanol were weighed and mixed evenly to obtain an asphalt regeneration agent.

[0061] The application method is as follows:

[0062] (1) The waste asphalt mixture is crushed and divided into two grades of crushed materials according to the particle size: 0-8 mm and 8-26 mm, and then dried;

[0063] (2) Weigh two grades of crushed materials with particle sizes of 0-8 mm and 8-26 mm at a mass ratio of 2:8, mix them at a set temperature, add asphalt regeneration agent and new 70# matrix asphalt in sequence, and continue to mix the obtained regenerated asphalt mixture. The mass of asphalt regeneration agent and new 70# matrix asphalt is 0.5% of the mass of waste asphalt mixture.

[0064] Example 2

[0065] Asphalt regeneration agent is composed of the following raw materials in parts by mass:

[0066]

[0067] The preparation method is as follows:

[0068] According to the above dosage relationship, polyurethane modified epoxy resin EPU-133L, castor oil triglycidyl ether, cardanol glycidyl ether, adhesion promoter HY-105, monoamino polyether amine ZM-160, ZM-1100, curing agent 594, and cardanol were weighed and mixed evenly to obtain an asphalt regeneration agent.

[0069] The application method of the obtained asphalt regeneration agent is the same as that in Example 1.

[0070] Example 3

[0071] Asphalt regeneration agent is composed of the following raw materials in parts by mass:

[0072]

[0073] The preparation method is as follows:

[0074] According to the above dosage relationship, polyurethane modified epoxy resin EPU-133L, cardanol glycidyl ether, adhesion promoter HY-105, monoamino polyether amine ZM-160, ZM-1100, curing agent 594, and cardanol are weighed and mixed evenly to obtain an asphalt regeneration agent that is easy to use.

[0075] The application method of the obtained asphalt regeneration agent is the same as that in Example 1.

[0076] Example 4

[0077] The asphalt regeneration agent provided in this embodiment is easy to use and is composed of the following raw materials in parts by mass:

[0078]

[0079] The preparation method is as follows:

[0080] According to the above dosage relationship, polyurethane modified epoxy resin EPU-133L, cardanol glycidyl ether, adhesion promoter HY-101, monoamino polyether amine ZM-1100, curing agent 594, and cardanol were weighed and mixed evenly to obtain an asphalt regeneration agent.

[0081] The application method of the obtained asphalt regeneration agent is the same as that in Example 1.

[0082] Comparative Example 1

[0083] Asphalt regeneration agent XT-2 produced by a domestic company is commercially available and its application method is the same as that of Example 1.

[0084] Comparative Example 2

[0085] The asphalt regeneration agent provided in this comparative example is composed of the following raw materials in parts by mass:

[0086]

[0087] The preparation method is as follows:

[0088] According to the above dosage relationship, polyurethane modified epoxy resin EPU-133L, cardanol glycidyl ether, diamino polyetheramine D2000, curing agent 594, and cardanol are weighed and mixed evenly to obtain an asphalt regeneration agent for standby use;

[0089] The application method of the obtained asphalt regeneration agent is the same as that in Example 1.

[0090] Comparative Example 3

[0091] The modifier for regenerated asphalt provided in this comparative example is composed of component A and component B in a mass ratio of 1:1, and the component A is composed of the following raw materials in parts by mass:

[0092]

[0093] The B component is composed of the following raw materials in parts by mass:

[0094]

[0095] The preparation method of the modifier for regenerated asphalt is as follows:

[0096] (1) According to the above-mentioned dosage relationship, weigh cardanol glycidyl ether, castor oil triglycidyl ether, cashew nut shell oil, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, and hexadecylsilane, mix them evenly to obtain component A for use;

[0097] (2) According to the above dosage relationship, weigh the tertiary amine accelerator DMP-30, diamino polyetheramine D230, triamino polyetheramine ZT143, and cashew nut shell oil, mix them evenly to obtain component B for later use;

[0098] (3) Component A and component B are mixed in a mass ratio of 1:1 to obtain a modifier for recycled asphalt.

[0099] The application method of the asphalt regeneration agent is the same as that in Example 1.

[0100] Test Method

[0101] High temperature stability, low temperature crack resistance, and water stability tests: According to the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011), the recycled asphalt mixtures of Examples 1 to 4 and Comparative Examples 1 to 3 were molded into Marshall specimens and rutting plate specimens and cured, and then tested; the test results are shown in Tables 1 and 2.

[0102] Table 1 Asphalt regeneration agent warm mix performance

[0103]

[0104] Note: 1. It is the Marshall degree of 60℃ immersion; 2. Using a standard mold, measure the ratio of the mass to the height of the specimen at different mixing temperatures. The aggregate and weight used in the specimen are kept consistent. The higher the mass ratio, the denser the mixture; 3. Mixing temperature.

[0105] As can be seen from Table 1, the asphalt regeneration agent provided by the present invention is used for asphalt regeneration and has an excellent warm mixing effect. The Marshall stability of the regenerated asphalt mixtures obtained in Examples 1 to 4 is about 11 kN when the mixing temperature is 110°C, and the mass-to-height ratio of the specimen is above 18.50. The Marshall stability of Comparative Examples 1 and 2 is lower than 8 kN when the mixing temperature is 110°C, and the mass-to-height ratio also drops to about 18.1, indicating that the compactness of the specimens at this mixing temperature is poor. Although Comparative Example 3 still has a Marshall stability (115°C) of 11 kN due to the presence of more epoxy resin, the mass-to-height ratio decreases significantly. It can be seen that compared with Comparative Examples 1 to 3, the mixing properties of Examples 1 to 4 at low mixing temperatures are significantly better.

[0106] Table 2 Road performance of asphalt regeneration agent 1

[0107]

[0108]

[0109] Note: 1. The mixing temperature of recycled asphalt mixture is 110℃; 2. The test temperature is 60℃; 3. The test temperature is -10℃; 4. It is the water-immersion Marshall residual stability.

[0110] As can be seen from Table 2, the asphalt regeneration agent provided by the present invention is used for asphalt regeneration, and has the characteristics of good regeneration effect, high strength, good water stability, excellent low temperature performance and high temperature performance. The Marshall stability of the regenerated asphalt mixture obtained in Examples 1 to 4 is about 11kN when the mixing temperature is 110°C (see Table 1), the dynamic stability is also more than 5000 times / mm, the low temperature bending strain is more than 2900, the residual stability is more than 90%, and the freeze-thaw strength ratio is also more than 85%. Compared with Comparative Examples 1 to 3, under the same conditions, all aspects of performance have been significantly improved. A lower mixing temperature can reduce the energy consumption in the asphalt regeneration process, and also improve the convenience of construction.

[0111] In summary, the asphalt regeneration agent provided by the present invention plays a good reinforcing role while regenerating asphalt, effectively improving the high temperature performance and low temperature performance of the regenerated asphalt mixture. In addition, due to the special selection of raw materials, it also has an obvious low temperature warm mixing effect, thereby reducing the energy consumption in the regeneration production process. The main raw material diluent used in the present invention is refined from natural bio-based materials, without using volatile toxic or flammable solvents, and is friendly to personnel and the environment.

[0112] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An asphalt regeneration agent, characterized in that: The invention comprises the following raw materials in parts by weight: 6 to 12 parts of epoxy compound, 0.5 to 2 parts of adhesion promoter, 2 to 5 parts of curing agent and 83 to 92 parts of diluent, wherein the epoxy compound comprises polyurethane modified epoxy resin.

2. The asphalt regeneration agent according to claim 1, characterized in that: The epoxy compound further comprises one or more of dimer acid diglycidyl ester, castor oil triglycidyl ether and cardanol glycidyl ether.

3. The asphalt regeneration agent according to claim 1 or 2, characterized in that: The mass proportion of the epoxy compound in the raw material is 6.5 to 10 parts.

4. The asphalt regeneration agent according to claim 1, characterized in that: The adhesion promoter is a long-chain titanate compound.

5. The asphalt regeneration agent according to claim 1 or 4, characterized in that: The adhesion promoter includes isopropyl dioleyl (dioctyl phosphate) titanate and / or isopropyl trioleyl titanate.

6. The asphalt regeneration agent according to claim 1 or 4, characterized in that: The mass proportion of the adhesion promoter in the raw material is 0.7 to 1.5 parts.

7. The asphalt regeneration agent according to claim 1, characterized in that: The curing agent includes polyetheramine and / or latent curing agent.

8. The asphalt regeneration agent according to claim 1 or 7, characterized in that: The mass proportion of the curing agent in the raw materials is 3 to 4.5 parts.

9. Use of the asphalt regeneration agent according to any one of claims 1 to 8 in the field of asphalt regeneration.

10. A method for regenerating waste asphalt, characterized in that: The following steps are involved: Crushing the waste asphalt mixture to obtain crushed material; The crushed material, the asphalt regeneration agent according to any one of claims 1 to 8 and the base asphalt are mixed to obtain a regenerated asphalt mixture; the mass of the asphalt regeneration agent is 0.3% to 0.6% of the mass of the waste asphalt mixture; the mass of the base asphalt is 0.3% to 0.6% of the mass of the waste asphalt mixture.

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