Asphalt regenerant, application thereof and method for regenerating waste asphalt

Abstract

The application provides an asphalt regenerating agent and application thereof and a method for regenerating waste asphalt, and belongs to the technical field of pavement materials.The asphalt regenerating agent comprises the following raw materials in mass fractions: 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.The application introduces the flexible epoxy compound, i.e., polyurethane modified epoxy resin, which cooperates with the curing agent to improve the warm-mixing effect of the asphalt regenerating agent at low temperature (110-115 DEG C), can ensure the regenerating effect, plays a reinforcing and toughening role through the curing of the epoxy group, can effectively improve the high-temperature performance, low-temperature performance, water stability and durability of the regenerated asphalt mixture, and can reduce the energy consumption and carbon emission in the production and construction processes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pavement materials, and particularly relates to a bitumen recycling agent, application thereof and a recycling method of waste bitumen. BACKGROUND

[0002] In the use process of the asphalt pavement, the bitumen is affected by environmental factors such as light, heat, oxygen and water and traffic load, which causes the aging and brittleness of the bitumen, thereby affecting the pavement function. The aging of the bitumen is mainly the loss of light components, the crystallization and polymerization of small molecular substances and the oxidation of components. The aging of the bitumen causes the dryness and brittleness of the pavement, and further causes the cracking and loosening of the pavement. The aging of the bitumen pavement causes the deterioration of the pavement function, and also causes a large amount of solid waste during the maintenance, which affects the environment. Therefore, how to recycle and utilize the aged bitumen and bitumen mixture has become a research hotspot in the field of road traffic.

[0003] In addition to the recycling and repair of the aged bitumen, the recycling of the waste bitumen also needs to consider the improvement of the pavement performance of the recycled mixture. In addition, the convenience of the actual use of the recycling agent also needs to be considered, such as whether the components of the recycling agent need to be mixed uniformly on site and the mixing temperature. The related technology discloses a modifier for recycling bitumen, introduces a bio-based epoxy compound prepared from natural bio-based materials, which can ensure the recycling effect and play a reinforcing role through the curing of the epoxy group, but has the problem of poor warm mixing effect at low temperature (110-115 DEG C). SUMMARY

[0004] Therefore, the present application aims to provide a bitumen recycling agent, application thereof and a recycling method of waste bitumen. The bitumen recycling agent has good warm mixing effect at low temperature (110-115 DEG C).

[0005] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions.

[0006] The present application provides a bitumen recycling agent, which comprises the following raw materials in mass fraction: 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 a polyurethane modified epoxy resin.

[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 materials is 6.5-10 parts.

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

[0010] Preferably, the adhesion promoter comprises isopropyl dioleoyl acyloxy (dioctyl phosphoric acyloxy) titanate (HY-101) and / or isopropyl trioleoyl acyloxy titanate (HY-105).

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

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

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

[0014] The application also provides the application of the asphalt regenerating agent in the asphalt regeneration field.

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

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

[0017] Mixing the crushed materials, the asphalt regenerating agent and base asphalt to obtain regenerated asphalt mixture; the mass of the asphalt regenerating agent is 0.3%-0.6% of the mass of the waste asphalt mixture; the mass of the base asphalt is 0.3%-0.6% of the mass of the waste asphalt mixture.

[0018] The application provides an asphalt regenerating agent, comprising the following raw materials in mass fraction: 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 a polyurethane modified epoxy resin.

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

[0020] The application introduces the flexible epoxy compound polyurethane modified epoxy resin, which acts together with the curing agent to improve the warm mixing effect of the asphalt regenerating agent at low temperature (110-115℃), can ensure the regenerating effect, and plays a reinforcing and toughening role through the curing of the epoxy group, can effectively improve the high-temperature performance, low-temperature performance, water stability and durability of the regenerated asphalt mixture, and can reduce the energy consumption and carbon emission in the production and construction process.

[0021] Further, the adhesion promoter in the application is a long-chain titanate compound, which is a titanate adhesion promoter containing an oleic acid structure, has long carbon chain structure, the characteristics of oil ester and chemical coupling effect, can improve the adhesion between asphalt and aggregate, and thus improve the mechanical strength of the mixture.

[0022] Further, the present application can ensure excellent storage stability of the asphalt regenerant by selecting suitable low-activity epoxy compounds (including polyurethane-modified epoxy resin and dimer acid diglycidyl ester) and controlling the amount of polyether amine curing agent and latent curing agent. In addition, the present application can ensure good compatibility with asphalt by introducing components having similar chemical structures as asphalt (including polyether polyol segments in polyurethane-modified epoxy resin, dimer acid structure in dimer acid glycidyl ester, dimer acid structure and ester groups in adhesion promoter, and side chains of diluent cardanol).

[0023] Further, the polyether amine used in the present application has emulsifying effect while curing the epoxy compound, which can emulsify the epoxy compound and asphalt, thereby improving the flowability of the material, further reducing the mixing temperature, reducing the emission of greenhouse gases, preventing aging, ensuring the compaction degree and construction quality.

[0024] Further, the asphalt regenerant provided by the present application is simple to use and has good warm-mixing effect, only contains one component, and can be directly used on site after preparation without the need of on-site mixing.

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

[0026] The present application provides an asphalt regenerant, which comprises the following raw materials in mass fraction: 6-12 parts of epoxy compound, 0.5-2 parts of adhesion promoter, 2-5 parts of curing agent, and 83-92 parts of diluent, wherein the epoxy compound comprises polyurethane-modified epoxy resin.

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

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

[0029] In the present application, the epoxy compound further comprises one or more of dimer acid diglycidyl ester, castor oil triglycidyl ether and cardanol glycidyl ether. In specific embodiments of the present application, 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 polyurethane 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 the curing agent, which can play a reinforcing and toughening role through the curing of epoxy groups while ensuring the regeneration effect, and together with the curing agent, improves the warm-mixing effect of the asphalt regenerant at low temperature (110-115℃), and effectively improves the high-temperature performance and low-temperature performance of the regenerated asphalt mixture.

[0030] In the present application, the mass fraction of the epoxy compound in the raw material is preferably 6.5-10, and specifically can be 6, 6.5, 8, 8.3, 10 or 12 parts.

[0031] In the present application, the adhesion promoter is preferably a long-chain titanate compound, and more preferably comprises isopropyl dioleoyl-oxy(di-octyl-phosphato) titanate and / or isopropyl trioleoyl-oxy titanate, which has an ester group in addition to a long chain, and has better compatibility with asphalt.

[0032] The mass fraction of the adhesion promoter in the raw material is preferably 0.7-1.5 parts based on the mass of the epoxy compound, and specifically can be 0.7, 1.2 or 1.5 parts.

[0033] The mass fraction of the curing agent in the raw material is preferably 3-4.5 parts based on the mass of the epoxy compound, and specifically can be 3, 3.3, 4.2 or 4.3 parts.

[0034] In the present application, the curing agent preferably comprises a polyether amine and / or a latent curing agent; the polyether amine preferably comprises one or more of monoamine-based polyether amine, diamine-based polyether amine and triamine-based polyether amine, and the latent curing agent is preferably boron heteroalkane tertiary amine curing agent 594; the monoamine-based polyether amine has emulsifying effect while curing the epoxy compound, and can emulsify the epoxy compound and asphalt, and jointly act with the epoxy compound, thereby improving the fluidity of the material, further reducing the mixing temperature, reducing the emission of greenhouse gases, preventing aging, ensuring the compaction degree and construction quality.

[0035] In the present application, the monoamine-based polyether amine preferably comprises ZM-160 and ZM-1100.

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

[0037] The mass fraction of the diluent in the raw material is preferably 85-89.5 parts, and can be specifically 86, 86, 87.5 or 89.5 parts, based on the mass of the epoxy compound.

[0038] In the present application, the diluent preferably comprises one or more of cashew nut shell oil, cashew phenol and castor oil, and the diluent has good rejuvenation effect on aged asphalt, and the diluent used is refined from natural bio-based material, without using volatile toxic or flammable solvents, and is friendly to personnel and environment.

[0039] The present application ensures good compatibility with asphalt by introducing components with similar chemical structure to asphalt, including polyether polyol chain segments in polyurethane modified epoxy resin, dimer acid structure of dimer acid glycidyl ester, dimer acid structure and ester group in adhesion promoter, and side chain of diluent cashew phenol.

[0040] The present application also provides a preparation method of the asphalt rejuvenator described in the above technical solution, comprising the following steps:

[0041] The epoxy compound, adhesion promoter, curing agent and diluent are mixed to obtain the asphalt rejuvenator. The present application does not have special limitation on the specific way of mixing, and any way known to those skilled in the art can be used.

[0042] The asphalt regenerating agent of the present application only comprises one component and can be directly used on site after being formulated.

[0043] The present application also provides the application of the asphalt regenerating agent in the asphalt regeneration field.

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

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

[0046] Mixing the crushed materials, the asphalt regenerating agent and base asphalt to obtain regenerated asphalt mixture; the mass of the asphalt regenerating 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 present application crushes the waste asphalt mixture to obtain crushed materials.

[0048] The present application preferably screens the crushed waste asphalt mixture to obtain first crushed materials and second crushed materials; the particle size of the first crushed materials is preferably 0 to 8 mm, and the particle size of the second crushed materials is preferably 8 to 26 mm; the particle size range of the first crushed materials and the second crushed materials is to form a grading, so as to avoid the problem that the aggregate cannot form a good grading and it is difficult to obtain good road performance.

[0049] The present application does not have special limitations on the specific way of crushing, and any method known to those skilled in the art can be used.

[0050] After obtaining the crushed materials, the present application mixes the crushed materials, the asphalt regenerating agent and base asphalt to obtain regenerated asphalt mixture; the mass of the asphalt regenerating 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 application, the mass ratio of the first crushed materials to the second crushed materials is preferably 2:8.

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

[0053] In the present application, the mass of the base asphalt can be specifically 0.3%, 0.4%, 0.5% or 0.6% of the mass of the waste asphalt mixture.

[0054] In the present application, the base pitch is preferably 70# base pitch.

[0055] The technical solutions in the present application will be described clearly and completely below in combination with the embodiments in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0056] Embodiment 1

[0057] The asphalt regenerant is composed of the following raw materials in mass fraction:

[0058]

[0059] The preparation method is as follows:

[0060] According to the above amount relationship, the polyurethane modified epoxy resin EPU-133L, dimer acid diglycidyl ester, cardanol glycidyl ether, adhesion promoter HY-101, monoamine polyether amine ZM-160, ZM-1100, curing agent 594, and cardanol are weighed and uniformly mixed to obtain the asphalt regenerant.

[0061] The application method is as follows:

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

[0063] (2) The two grades of 0-8 mm and 8-26 mm crushed materials are weighed according to a mass ratio of 2:8, and are mixed at a set temperature, and the asphalt regenerant and new 70# base pitch are added in turn, and the mixing is continued to obtain the regenerated asphalt mixture. The mass of the asphalt regenerant and the new 70# base pitch is 0.5% of the mass of the waste asphalt mixture.

[0064] Embodiment 2

[0065] The asphalt regenerant is composed of the following raw materials in mass fraction:

[0066]

[0067] The preparation method is as follows:

[0068] According to the above amount relationship, the polyurethane modified epoxy resin EPU-133L, dimer acid diglycidyl ester, cardanol glycidyl ether, adhesion promoter HY-101, monoamine polyether amine ZM-160, ZM-1100, curing agent 594, and cardanol are weighed and uniformly mixed to obtain the asphalt regenerant.

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

[0070] Example 3

[0071] The asphalt regenerant provided in this example is composed of the following raw materials in mass parts:

[0072]

[0073] The preparation method is as follows:

[0074] According to the above amount relationship, polyurethane modified epoxy resin EPU-133L, cashew phenol glycidyl ether, adhesion promoter HY-101, monoamine polyether amine ZM-1100, curing agent 594, and cashew phenol are weighed and uniformly mixed to obtain the asphalt regenerant.

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

[0076] Example 4

[0077] The asphalt regenerant provided in this example is composed of the following raw materials in mass parts:

[0078]

[0079] The preparation method is as follows:

[0080] According to the above amount relationship, polyurethane modified epoxy resin EPU-133L, cashew phenol glycidyl ether, adhesion promoter HY-101, monoamine polyether amine ZM-1100, curing agent 594, and cashew phenol are weighed and uniformly mixed to obtain the asphalt regenerant.

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

[0082] Comparative Example 1

[0083] The asphalt regenerant XT-2 produced by a domestic company is commercially available, and the application method is the same as that of Example 1.

[0084] Comparative Example 2

[0085] The asphalt regenerant provided in this example is composed of the following raw materials in mass parts:

[0086]

[0087] The preparation method is as follows:

[0088] According to the above amount relationship, the polyurethane modified epoxy resin EPU-133L, cardanol glycidyl ether, diamine polyether amine D2000, curing agent 594, cardanol were weighed and uniformly mixed to obtain the asphalt regenerating agent for standby;

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

[0090] Comparative Example 3

[0091] The regenerating asphalt modifier provided by the present comparative example is composed of A component and B component with a mass ratio of 1:1, the A component is composed of raw materials in the following mass fractions:

[0092]

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

[0094]

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

[0096] (1) According to the above amount relationship, the cardanol glycidyl ether, castor oil triglycidyl ether, cashew nut oil, 2-(3,4-epoxycyclohexyl) ethyl trimethoxysilane and hexadecylsilane were weighed and uniformly mixed to obtain the A component for standby;

[0097] (2) According to the above amount relationship, the tertiary amine accelerator DMP-30, diamine polyether amine D230, triamine polyether amine ZT143 and cashew nut oil were weighed and uniformly mixed to obtain the B component for standby;

[0098] (3) The A component and the B component with a mass ratio of 1:1 were mixed to obtain the regenerating asphalt modifier.

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

[0100] Test method

[0101] High temperature stability, low temperature crack resistance and water stability test: according to the "Highway Engineering Asphalt and Asphalt Mixture Test Regulation" (JTGE20-2011), the regenerating asphalt mixtures of Examples 1-4 and Comparative Examples 1-3 were molded into Marshall test pieces and rutting test pieces and were cured, and then were tested; the test results are shown in Tables 1 and 2.

[0102] Table 1 Warm-mixing performance of asphalt regenerating agent

[0103]

[0104] Note: 1. Marshall degree of immersion at 60℃; 2. The ratio of mass to height of the specimen was measured at different mixing temperatures, the aggregate and weight of the specimen were kept constant, and the greater the ratio of mass to height indicated the more compact the mixture; 3. Mixing temperature.

[0105] As can be seen from Table 1, the asphalt regenerant provided by the present application has excellent warm mixing effect when used for asphalt regeneration. The Marshall stability of the regenerated asphalt mixture obtained in Examples 1-4 is about 11 kN at a mixing temperature of 110℃, and the ratio of mass to height of the specimen is above 18.50. The Marshall stability of the specimen in Comparative Examples 1 and 2 is below 8 kN at a mixing temperature of 110℃, and the ratio of mass to height is also reduced to about 18.1, indicating that the compactness of the specimen is poor at this mixing temperature. Although the Marshall stability (115℃) of the specimen in Comparative Example 3 is still 11 kN due to the presence of a large amount of epoxy resin, the ratio of mass to height is significantly reduced. It can be seen that the mixing of Examples 1-4 is obviously better than that of Comparative Examples 1-3 at low mixing temperature.

[0106] Table 2 Road performance of asphalt regenerant 1

[0107]

[0108]

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

[0110] As can be seen from Table 2, the asphalt regenerant provided by the present application has the characteristics of good regeneration effect, high strength, good water stability, excellent low-temperature performance and high-temperature performance when used for asphalt regeneration. The Marshall stability of the regenerated asphalt mixture obtained in Examples 1-4 is about 11 kN at a mixing temperature of 110℃ (see Table 1), the dynamic stability is 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 more than 85%. Compared with Comparative Examples 1-3, the performance in all aspects has been significantly improved under the same conditions. Lower mixing temperature can reduce energy consumption in the process of asphalt regeneration, and also improve the convenience of construction.

[0111] In summary, the asphalt regenerant provided by the present application not only regenerates asphalt, but also has a good reinforcing effect, 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 obvious low-temperature warm mixing effect, thereby reducing energy consumption in the process of regeneration production. The main raw material diluent used in the present application is a natural bio-based material refined, without using volatile toxic or flammable solvents, which is friendly to personnel and environment.

[0112] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. It should be noted that, for those skilled in the art, several improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as falling within the scope of protection of the present application.

Claims

1. An asphalt recycling agent, characterized in that, Specifically, the raw materials are in the following proportions by weight: 6-12 parts epoxy compound, 0.5-2 parts adhesion promoter, 2-5 parts curing agent, and 83-92 parts diluent, wherein the epoxy compound includes polyurethane modified epoxy resin; The epoxy compound also includes one or more of diglycidyl dimerase, castor oil triglycidyl ether, and cashew phenol glycidyl ether. The adhesion promoters include isopropyl dioleoyloxy (dioctylphosphoyloxy) titanate and / or isopropyl trioleoyloxy titanate.

2. The asphalt recycling agent according to claim 1, characterized in that, The raw material contains 6.5 to 10 parts by mass of epoxy compound.

3. The asphalt recycling agent according to claim 1, characterized in that, The adhesion promoter in the raw material is 0.7 to 1.5 parts by mass.

4. The asphalt recycling agent according to claim 1, characterized in that, The curing agent includes polyetheramine and / or latent curing agent.

5. The asphalt recycling agent according to claim 1 or 4, characterized in that, The curing agent in the raw material is 3 to 4.5 parts by weight.

6. The application of the asphalt recycling agent according to any one of claims 1 to 5 in the field of asphalt recycling.

7. A method for recycling waste asphalt, characterized in that, Includes the following steps: The waste asphalt mixture is crushed to obtain crushed material; The crushed material, the asphalt recycling agent according to any one of claims 1 to 5, and the base asphalt are mixed to obtain a recycled asphalt mixture; the mass of the asphalt recycling 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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