An in-situ cold recycling asphalt emulsifier, its preparation method and application

Abstract

The present invention belongs to the technical field of fine chemical engineering, and relates to an in-situ cold recycling asphalt emulsifier, its preparation method and application. The general molecular structure formula of the in-situ cold recycling asphalt emulsifier is: The molar ratio of the in-situ cold recycling asphalt emulsifier is as follows: the molar ratio of alkylphenol polyoxyethylene ether, isopropanol, maleic anhydride, polyamine compounds, and acrylic compounds is 1:3 to 10:1.00 to 1.08:1.00 to 1.30:1.00 to 1.35. The in-situ cold recycling asphalt emulsifier of the present invention has the characteristics of low production cost, wide sources of raw materials, and simple preparation process. The in-situ cold recycling cationic emulsified asphalt of the present invention has good storage stability, a long mixing time, and workability during construction, and has good adhesion to aggregates.

Description

Technical Field

[0001] The present invention relates to an in-situ cold recycling asphalt emulsifier, a preparation method thereof and an application thereof, belonging to the technical field of fine chemical engineering. Background Art

[0002] The asphalt cold recycling technology is to mix waste asphalt mixture, newly added stone materials, cement, emulsified asphalt, polymer latex, etc. in appropriate proportions, and then mix and spread them to form a new asphalt pavement that meets the road use performance. The asphalt cold recycling technology is divided into plant mix cold recycling and in-situ cold recycling.

[0003] The key to the asphalt cold recycling technology lies in the used cold recycling asphalt emulsifier. At present, the varieties of cold recycling asphalt emulsifiers on the market are single, and the applicable construction scope is limited. During the in-situ cold recycling construction process, problems such as poor adhesion with waste asphalt mixture, long open traffic time, and long initial setting time often occur, thus restricting its application.

[0004] For the production of cold recycling asphalt emulsifiers, there are generally disadvantages such as high production cost, limited raw materials, and complex and difficult preparation processes.

[0005] In summary, it is necessary to develop a new type of cold recycling asphalt emulsifier, so that its production cost is lower, the production process is simpler, and it has better use performance to meet the application requirements of in-situ cold recycling in road construction. Summary of the Invention

[0006] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide an in-situ cold recycling asphalt emulsifier, a preparation method thereof and an application thereof, which have a lower production cost, a simpler production process, and better use performance to meet the application requirements of in-situ cold recycling in road construction.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] In the first aspect of the present invention, an in-situ cold recycling asphalt emulsifier is provided, and its general molecular structure formula is:

[0009] ,

[0010] wherein, R1 is an alkyl group with 8-12 carbon atoms;

[0011] n is an integer from 7 to 30;

[0012] R2 is:

[0013] ;

[0014] ;

[0015] ;

[0016] ;

[0017] ;

[0018] ;

[0019] ;

[0020] ;

[0021] or

[0022] ;

[0023] wherein, m is an integer from 1 to 3;

[0024] R3 is H or hydroxyethyl (-CH2CH2OH).

[0025] In the second aspect of the present invention, a preparation method of an in-situ cold recycling asphalt emulsifier is provided, comprising the following steps:

[0026] 1) Mixing and reacting a polyamine compound, isopropanol and an acrylic compound to obtain reaction intermediate I, and the structural general formula of the reaction intermediate I is:

[0027] ;

[0028] wherein, R2 is:

[0029] ;

[0030] ;

[0031] ;

[0032] ;

[0033] ;

[0034] ;

[0035] ;

[0036] ;

[0037] or

[0038] ;

[0039] wherein, m is an integer from 1 to 3;

[0040] R3 is H or hydroxyethyl (-CH2CH2OH);

[0041] 2) Mix and react alkylphenol polyoxyethylene ether and maleic anhydride to obtain reaction intermediate II, and the general structural formula of the reaction intermediate II is:

[0042] ;

[0043] wherein, R1 is an alkyl group with 8 to 12 carbon atoms;

[0044] n is an integer from 7 to 30;

[0045] 3) Add reaction intermediate II to reaction intermediate I, mix and react to obtain an in-situ cold recycling asphalt emulsifier.

[0046] In the third aspect of the present invention, a preparation method of cationic in-situ cold recycling emulsified asphalt is provided, including the following steps: the dosage of the in-situ cold recycling asphalt emulsifier is 1.5 to 3.0% of the total mass of the prepared cationic in-situ cold recycling emulsified asphalt. Prepare an asphalt emulsifier aqueous solution by adding water to the in-situ cold recycling asphalt emulsifier, and adjust the pH value to 2.0 to 3.0 with industrial hydrochloric acid, and heat to 60.0 to 70.0 °C to obtain an asphalt emulsifier soap solution; emulsify the heated asphalt and the asphalt emulsifier soap solution through a colloid mill to prepare cationic in-situ cold recycling emulsified asphalt.

[0047] The cationic in-situ cold recycling emulsified asphalt prepared by the above preparation method.

[0048] In the fourth aspect of the present invention, an application of the in-situ cold recycling asphalt emulsifier described in the first aspect as a cationic in-situ cold recycling emulsified asphalt is provided.

[0049] The above application is to mix and spread waste asphalt mixture, newly added aggregates, cement, water, cationic in-situ cold recycling emulsified asphalt, and SBR latex in appropriate proportions to form a new asphalt pavement that meets the road use performance.

[0050] The specific embodiments of the present invention have the following beneficial effects:

[0051] (1) The in-situ cold recycling asphalt emulsifier described in the present invention overcomes the problems of poor adhesion to waste asphalt mixture, long open traffic time, and long initial setting time that often occur in the current in-situ cold recycling construction process, and has good application prospects.

[0052] (2) The in-situ cold recycling asphalt emulsifier described in the present invention has the advantages of low production cost, wide raw material sources, simple preparation process, and better use performance, and is easy to promote and apply.

[0053] (3) The in-situ cold recycling cationic emulsified asphalt of the present invention has good storage stability, a relatively long mixing time and workability during construction, and good adhesion to aggregates.

[0054] (4) By reacting with polyamine compounds, acrylic compounds, alkylphenol polyoxyethylene ethers and maleic anhydride, the in-situ cold recycling asphalt emulsifier molecules prepared in the present invention have relatively high hydrophilicity. The hydrophilic groups contained are ether groups, hydroxyl groups, carbonyl groups, aldehyde groups, carboxyl groups, amino groups and amide groups, which improve the stability of the emulsified asphalt.

[0055] (5) The in-situ cold recycling asphalt emulsifier with a specific HLB value is synthesized from specific raw materials in the present invention. The prepared emulsified asphalt has excellent performance indicators and has the characteristics of slow cracking and fast setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0057] Figure 1 It is the infrared spectrum diagram of the asphalt emulsifier in Example 1 of the present invention.

[0058] Figure 2 It is the infrared spectrum diagram of the asphalt emulsifier in Example 2 of the present invention.

[0059] Figure 3 It is the infrared spectrum diagram of the asphalt emulsifier in Example 3 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0060] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0061] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] In one embodiment of the present invention, an in-situ cold recycling asphalt emulsifier is provided, and the general formula of its molecular structure is:

[0063] ,

[0064] Among them, R1 is an alkyl group with 8 to 12 carbon atoms;

[0065] n is an integer from 7 to 30;

[0066] R2 is:

[0067] ;

[0068] ;

[0069] ;

[0070] ;

[0071] ;

[0072] ;

[0073] ;

[0074] ;

[0075] or

[0076] ;

[0077] Among them, m is an integer from 1 to 3;

[0078] R3 is H or hydroxyethyl (-CH2CH2OH).

[0079] The in-situ cold recycling asphalt emulsifier disclosed in the embodiments of the present invention connects ether groups, hydroxyl groups, carbonyl groups, aldehyde groups, carboxyl groups, amine groups, and amide group hydrophilic groups in a certain manner, and cooperates with long-chain alkyl lipophilic groups and benzene rings to form a novel structure of the in-situ cold recycling asphalt emulsifier molecule.

[0080] In one embodiment of the present invention, a preparation method of the above in-situ cold recycling asphalt emulsifier is provided, including the following steps:

[0081] 1) Mix and react a polyamine compound, isopropanol, and an acrylic compound to obtain reaction intermediate I, and the structural general formula of the reaction intermediate I is:

[0082] ;

[0083] Among them, R2 is:

[0084] ;

[0085] ;

[0086] ;

[0087] ;

[0088] ;

[0089] ;

[0090] ;

[0091] ;

[0092] or

[0093] ;

[0094] wherein, m is an integer from 1 to 3;

[0095] R3 is H or hydroxyethyl (-CH2CH2OH);

[0096] 2) Mix and react alkylphenol polyoxyethylene ether and maleic anhydride to obtain reaction intermediate II, and the general structural formula of the reaction intermediate II is:

[0097] ;

[0098] wherein, R1 is an alkyl group with 8 to 12 carbon atoms;

[0099] n is an integer from 7 to 30;

[0100] 3) Add reaction intermediate II to reaction intermediate I, mix and react to obtain an in-situ cold recycling asphalt emulsifier.

[0101] The general reaction equation is:

[0102] The first-step reaction:

[0103] (1)

[0104] or

[0105] (2)

[0106] or

[0107] (3)

[0108] or

[0109] (4)

[0110] or

[0111] (5)

[0112] or

[0113] (6)

[0114] or

[0115] (7)

[0116] or

[0117] (8)

[0118] or

[0119] (9)

[0120] or

[0121] (10)

[0122] or

[0123] (11)

[0124] or

[0125] (12)

[0126] Step 2 reaction:

[0127] (13)

[0128] Step 3 reaction:

[0129] (14)

[0130] In a specific embodiment, the molar ratio of the alkylphenol polyoxyethylene ether, isopropanol, maleic anhydride, polyamine compound, and propylene compound is 1:3 to 10:1.00 to 1.08:1.00 to 1.30:1.00 to 1.35.

[0131] In a specific embodiment, the alkylphenol polyoxyethylene ether is:

[0132] ,

[0133] wherein, R1 is an alkyl group with 8 to 12 carbon atoms; n is an integer from 7 to 30.

[0134] In a specific embodiment, the polyamine compound is triethylenetetramine, tetraethylenepentamine, diethylenetriamine, ethylenediamine, N-aminoethylpiperazine, or β-hydroxyethyl ethylenediamine.

[0135] In a specific embodiment, the acrylic compound is acrylic acid, acrolein, or acrylamide.

[0136] In a specific embodiment, in step 1), during the synthesis of reaction intermediate I, the reaction temperature is 65 - 82 °C, and the reaction time is 2 - 4 h.

[0137] In a specific embodiment, in step 2), during the synthesis of reaction intermediate II, the reaction temperature is 90 - 100 °C, and the reaction time is 2 - 4 h.

[0138] In a specific embodiment, in step 3), the reaction temperature is 65 - 82 °C, and the reaction time is 2 - 4 h.

[0139] In a preferred embodiment, the preparation method of the above in-situ cold recycling asphalt emulsifier specifically includes the following steps:

[0140] (1) Add the polyamine compound and isopropanol into a reaction vessel, then add the acrylic compound. After adding, stir and react at 65 - 82 °C for 2 - 4 h to obtain reaction intermediate I;

[0141] (2) Add the alkylphenol polyoxyethylene ether and maleic anhydride into another reaction vessel, heat and stir, and stir and react at 90 - 100 °C for 2 - 4 h to obtain reaction intermediate II;

[0142] (3) Add reaction intermediate II into reaction intermediate I, stir and react at 65 - 82 °C for 2 - 4 h to obtain the in-situ cold recycling asphalt emulsifier.

[0143] In an embodiment of the present invention, a preparation method of a cationic in-situ cold recycling emulsified asphalt is provided, including the following steps: the dosage of the in-situ cold recycling asphalt emulsifier is 1.5 - 3.0% of the total mass of the prepared cationic in-situ cold recycling emulsified asphalt. Prepare an asphalt emulsifier aqueous solution by adding water to the in-situ cold recycling asphalt emulsifier, and adjust the pH value to 2.0 - 3.0 with industrial hydrochloric acid, and heat to 60.0 - 70.0 °C to obtain an asphalt emulsifier soap solution; emulsify the heated asphalt and the asphalt emulsifier soap solution through a colloid mill to prepare a cationic in-situ cold recycling emulsified asphalt.

[0144] The cationic in-situ cold recycling emulsified asphalt prepared by the above preparation method.

[0145] In an embodiment of the present invention, an application of an in-situ cold recycling asphalt emulsifier as a cationic in-situ cold recycling emulsified asphalt is provided.

[0146] The above application is to mix and spread waste asphalt mixture, newly added stone materials, cement, water, cationic in-situ cold recycling emulsified asphalt, and SBR latex in appropriate proportions to form a new asphalt pavement that meets the road use performance.

[0147] In order to enable those skilled in the art to more clearly understand the technical solutions of this application, the technical solutions of this application will be described in detail below in combination with specific examples and comparative examples.

[0148] Example 1

[0149] This example provides an in-situ cold recycling asphalt emulsifier and its preparation method and application, including the following steps:

[0150] (1) Preparation of in-situ cold recycling asphalt emulsifier:

[0151] 1) Add 167.9 g of triethylenetetramine and 350 g of isopropanol to the reactor, then add 86.0 g of acrylamide, and stir and react at 75 °C for 3 h to obtain reaction intermediate I.

[0152] 2) Add 1086 g of OP-20 and 103.9 g of maleic anhydride to another reactor, heat and stir, and stir and react at 95 °C for 3 h to obtain reaction intermediate II.

[0153] 3) Add reaction intermediate II to reaction intermediate I, and stir and react at 75 °C for 3 h to obtain an in-situ cold recycling asphalt emulsifier.

[0154] The above-synthesized asphalt emulsifier product is subjected to infrared spectrum detection, and the analysis result is (see Figure 1 ): 2870 cm -1 (Peak 1) is the symmetric stretching vibration absorption peak of methylene, 1728 cm -1 (Peak 2) is the C=O stretching vibration absorption peak in carboxyl and ester groups, 1671 cm -1 (Peak 3) is the C=O stretching vibration peak of amide, 1456 cm -1 (Peak 4) is the asymmetric bending vibration absorption peak of methylene, 1247 cm -1 (Peak 5) is the stretching vibration absorption peak of Ar-O, 1114 cm -1 (Peak 6) is the stretching vibration absorption peak of R-O-R ' of, 682 cm -1 (Peak 7) is the out-of-plane bending vibration absorption peak of N-H.

[0155] The reaction equation is as follows:

[0156] (15)

[0157] (13)

[0158] Among them, R1 is -C8H 17 alkyl; n is 20.

[0159] (16)

[0160] Among them, R1 is -C8H 17 alkyl.

[0161] (2) Preparation of in-situ cold recycled cationic emulsified asphalt:

[0162] Weigh 13.0 g of the in-situ cold recycled asphalt emulsifier prepared in this example and add it to 200 g of water. Adjust the pH value to 2.5 with industrial hydrochloric acid and heat it to 60 °C to obtain the asphalt emulsifier soap solution. Weigh 300 g of AH-70 asphalt and heat it to 120 °C. Prepare the cationic in-situ cold recycled cationic emulsified asphalt by passing the hot asphalt and the asphalt emulsifier soap solution through a colloid mill.

[0163] The prepared in-situ cold recycled cationic emulsified asphalt is tested: the emulsified asphalt is delicate and uniform, the coating area with the aggregate is greater than 2 / 3, the charge is cationic, and all performance indicators are good.

[0164] (3) Application of cationic in-situ cold recycled emulsified asphalt:

[0165] Mix the waste asphalt mixture, namely the newly added stone, cement, water, cationic in-situ cold recycled emulsified asphalt, and SBR latex according to a certain ratio through mixing and paving. The mixing time can be greater than 3 min, and a new asphalt pavement meeting the road use performance can be formed.

[0166] Example 2

[0167] This example provides an in-situ cold recycled asphalt emulsifier, its preparation method and application, including the following steps:

[0168] (1) Preparation of in-situ cold recycled asphalt emulsifier:

[0169] 1) Add 167.9 g of triethylenetetramine and 350 g of isopropanol to the reactor, then add 87.2 g of acrylic acid, and stir and react at 75 °C for 3 h to obtain reaction intermediate I.

[0170] 2) Add 1086 g of OP-20 and 103.9 g of maleic anhydride to another reactor, heat and stir, and stir and react at 95 °C for 3 h to obtain reaction intermediate II.

[0171] 3) Add the reaction intermediate II to the reaction intermediate I, and stir the reaction at 75 °C for 3 h to obtain an in-situ cold recycled asphalt emulsifier.

[0172] The above-synthesized asphalt emulsifier product was subjected to infrared spectroscopy detection, and the analysis results were (see Figure 2 ): 3429 cm -1 (Peak 1) is the stretching vibration peak of O-H, 2870 cm -1 (Peak 2) is the symmetric stretching vibration absorption peak of methylene, 1728 cm -1 (Peak 3) is the C=O stretching vibration absorption peak in carboxyl and ester groups, 1465 cm -1 (Peak 4) is the asymmetric bending vibration of methylene, 1250 cm -1 (Peak 5) is the stretching vibration absorption peak of Ar-O, 1105 cm -1 (Peak 6) is the stretching vibration absorption peak of R-O-R ' 678 cm -1 (Peak 7) is the out-of-plane bending vibration absorption peak of N-H.

[0173] The reaction equation is:

[0174] (17)

[0175] (13)

[0176] Among them, R1 is -C8H 17 alkyl; n is 20.

[0177] (18)

[0178] Among them, R1 is -C8H 17 alkyl.

[0179] (2) Preparation of in-situ cold recycled cationic emulsified asphalt:

[0180] Weigh 13.0 g of the in-situ cold recycled asphalt emulsifier prepared in this example and add it to 200 g of water. Adjust the pH value to 2.5 with industrial hydrochloric acid and heat it to 60 °C to obtain an asphalt emulsifier soap solution. Weigh 300 g of AH-90 asphalt and heat it to 120 °C. Prepare cationic in-situ cold recycled cationic emulsified asphalt by passing the hot asphalt and the asphalt emulsifier soap solution through a colloid mill.

[0181] The prepared in-situ cold recycled cationic emulsified asphalt was tested: the emulsified asphalt was delicate and uniform, the coating area with the aggregate was greater than 2 / 3, the charge was cationic, and all performance indicators were good.

[0182] (3) Application of cationic in-situ cold recycling emulsified asphalt:

[0183] Mix waste asphalt mixture, newly added stone materials, cement, water, cationic in-situ cold recycling emulsified asphalt, and SBR latex according to a certain ratio, followed by mixing and paving. The mixing time should be greater than 3 minutes to form a new asphalt pavement that meets the road performance requirements.

[0184] Example 3

[0185] This example provides an in-situ cold recycling asphalt emulsifier, its preparation method and application, including the following steps:

[0186] (1) Preparation of in-situ cold recycling asphalt emulsifier:

[0187] 1) Add 148.4 g of N-aminoethylpiperazine and 350 g of isopropanol to the reactor, then add 86.0 g of acrylamide and stir at 75 °C for 3 h to obtain reaction intermediate I.

[0188] 2) Add 1086 g of OP-20 and 103.9 g of maleic anhydride to another reactor, heat and stir, and stir at 95 °C for 3 h to obtain reaction intermediate II.

[0189] 3) Add reaction intermediate II to reaction intermediate I and stir at 75 °C for 3 h to obtain the in-situ cold recycling asphalt emulsifier.

[0190] The above synthesized asphalt emulsifier product is subjected to infrared spectroscopy detection, and the analysis results are (see Figure 3 ): 3417 cm -1 (Peak 1) is the stretching vibration peak of O-H, 2875 cm -1 (Peak 2) is the symmetric stretching vibration absorption peak of methylene, 1728 cm -1 (Peak 3) is the C=O stretching vibration absorption peak in carboxyl and ester groups, 1672 cm -1 (Peak 4) is the C=O stretching vibration absorption peak of amide, 1463 cm -1 (Peak 5) is the asymmetric bending vibration of methylene, 1247 cm -1 (Peak 6) is the stretching vibration absorption peak of Ar-O, 1110 cm -1 (Peak 7) is the stretching vibration absorption peak of R-O-R ' of, 667 cm -1 (Peak 8) is the out-of-plane bending vibration absorption peak of N-H.

[0191] The reaction equation is:

[0192] (19)

[0193] (13)

[0194] Among them, R1 is -C8H 17 alkyl; n is 20.

[0195] (20)

[0196] Among them, R1 is -C8H 17 alkyl.

[0197] (2) Preparation of in-situ cold recycling cationic emulsified asphalt:

[0198] Weigh 13.0 g of the in-situ cold recycling asphalt emulsifier prepared in this example and add it to 200 g of water. Adjust the pH value to 2.5 with industrial hydrochloric acid and heat to 60 °C to obtain an asphalt emulsifier soap solution. Weigh 300 g of AH-90 asphalt and heat to 120 °C. Prepare cationic in-situ cold recycling cationic emulsified asphalt by passing the hot asphalt and the asphalt emulsifier soap solution through a colloid mill.

[0199] The prepared in-situ cold recycling cationic emulsified asphalt is tested: the emulsified asphalt is delicate and uniform, the area of coating with aggregate is greater than 2 / 3, the charge is cationic, and all performance indicators are good.

[0200] (3) Application of cationic in-situ cold recycling emulsified asphalt:

[0201] Mix the waste asphalt mixture, newly added stone materials, cement, water, cationic in-situ cold recycling emulsified asphalt, and SBR latex according to a certain ratio through mixing and paving. The mixing time can be greater than 3 min, and a new asphalt pavement meeting the road use performance can be formed.

[0202] Example 4

[0203] This example provides an in-situ cold recycling asphalt emulsifier and its preparation method and application, including the following steps:

[0204] (1) Preparation of in-situ cold recycling asphalt emulsifier:

[0205] 1) Add 119.8 g of β-hydroxyethyl ethylenediamine and 350 g of isopropanol to a reactor, then add 86.0 g of acrylamide, and stir and react at 75 °C for 3 h to obtain reaction intermediate I.

[0206] 2) Add 1086 g of OP-20 and 103.9 g of maleic anhydride to another reactor, heat and stir, and stir and react at 95 °C for 3 h to obtain reaction intermediate II.

[0207] (3) Add reaction intermediate II to reaction intermediate I and stir at 75 °C for 3 h to obtain an in-situ cold recycling asphalt emulsifier.

[0208] The reaction equation is:

[0209] (21)

[0210] (13)

[0211] Among them, R1 is -C8H 17 alkyl; n is 20.

[0212] (22)

[0213] Among them, R1 is -C8H 17 alkyl.

[0214] (2) Preparation of in-situ cold recycling cationic emulsified asphalt:

[0215] Weigh 12.5 g of the in-situ cold recycling asphalt emulsifier prepared in this example and add it to 200 g of water. Adjust the pH value to 2.5 with industrial hydrochloric acid and heat to 62 °C to obtain an asphalt emulsifier soap solution. Weigh 300 g of AH-90 asphalt and heat to 120 °C. Prepare cationic in-situ cold recycling cationic emulsified asphalt by passing the hot asphalt and the asphalt emulsifier soap solution through a colloid mill.

[0216] The prepared in-situ cold recycling cationic emulsified asphalt is tested: the emulsified asphalt is delicate and uniform, the coating area with aggregates is greater than 2 / 3, the charge is cationic, and all performance indicators are good.

[0217] (3) Application of cationic in-situ cold recycling emulsified asphalt:

[0218] Mix and spread waste asphalt mixture, newly added stone materials, cement, water, cationic in-situ cold recycling emulsified asphalt, and SBR latex according to a certain ratio. The mixing time can be greater than 3 min, and a new asphalt pavement meeting the road use performance can be formed.

[0219] Example 5

[0220] This example provides an in-situ cold recycling asphalt emulsifier and its preparation method and application, including the following steps:

[0221] (1) Preparation of in-situ cold recycling asphalt emulsifier:

[0222] 1) Add 167.9 g of triethylenetetramine and 350 g of isopropanol to the reactor, then add 67.8 g of acrolein and stir at 75 °C for 3 h to obtain reaction intermediate I.

[0223] (2) Add 1086 g of OP-20 and 103.9 g of maleic anhydride into another reactor, heat and stir. React at 95 °C with stirring for 3 h to obtain reaction intermediate II.

[0224] (3) Add reaction intermediate II into reaction intermediate I, and react at 75 °C with stirring for 3 h to obtain in-situ cold recycling asphalt emulsifier.

[0225] The reaction equation is:

[0226] (23)

[0227] (13)

[0228] Among them, R1 is -C8H 17 alkyl; n is 20.

[0229] (24)

[0230] Among them, R1 is -C8H 17 alkyl.

[0231] (2) Preparation of in-situ cold recycling cationic emulsified asphalt:

[0232] Weigh 13.0 g of the in-situ cold recycling asphalt emulsifier prepared in this example and add it to 200 g of water. Adjust the pH value to 2.5 with industrial hydrochloric acid and heat to 60 °C to obtain asphalt emulsifier soap solution. Weigh 300 g of AH-90 asphalt and heat to 120 °C. Prepare cationic in-situ cold recycling cationic emulsified asphalt by passing the hot asphalt and asphalt emulsifier soap solution through a colloid mill.

[0233] The prepared in-situ cold recycling cationic emulsified asphalt is tested: the emulsified asphalt is delicate and uniform, the coating area with aggregate is greater than 2 / 3, the charge is cationic, and all performance indicators are good.

[0234] (3) Application of cationic in-situ cold recycling emulsified asphalt:

[0235] Mix the waste asphalt mixture, newly added stone materials, cement, water, cationic in-situ cold recycling emulsified asphalt, and SBR latex according to a certain ratio through mixing and paving. The mixing time can be greater than 3 min, and a new asphalt pavement that meets the road use performance can be formed.

[0236] Comparative Example 1

[0237] In the preparation method of the in-situ cold recycling asphalt emulsifier in Example 1, change "1086 g of OP-20" to "426 g of OP-5", and keep other conditions unchanged. The synthesized emulsifier cannot emulsify asphalt.

[0238] Note: In alkylphenol polyoxyethylene ether (OP-5), R1 is -C8H 17 alkyl group, and n is 5. In alkylphenol polyoxyethylene ether (OP-20), R1 is -C8H 17 alkyl group, and n is 20.

[0239] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An in-situ cold recycling asphalt emulsifier, characterized in that, The general molecular structure formula of the in-situ cold recycling asphalt emulsifier is as follows: Among them, R1 is an alkyl group with 8 to 12 carbon atoms; n is 20; R2 is: -NHCH2CH2COOH; -NHCH2CH2CONH2; -NH(CH2CH2NH) m CH2CH2COOH; -NH(CH2CH2NH) m CH2CH2CONH2; -NHCH2CH2COH; or -NH(CH2CH2NH) m CH2CH2COH; Among them, m is an integer from 1 to 3; R3 is H or hydroxyethyl.

2. The preparation method of the in-situ cold recycling asphalt emulsifier according to claim 1, characterized in that, It includes the following steps: 1) Mix and react a polyamine compound, isopropanol and an acrylic compound to obtain reaction intermediate I, and the general structural formula of the reaction intermediate I is: R3NHCH2CH2R2; Among them, R2 is: -NHCH2CH2COOH; -NHCH2CH2CONH2; -NH(CH2CH2NH) m CH2CH2COOH; -NH(CH2CH2NH) m CH2CH2CONH2; -NHCH2CH2COH; or -NH(CH2CH2NH) m CH2CH2COH; Among them, m is an integer from 1 to 3; R3 is H or hydroxyethyl; 2) Mix and react an alkylphenol polyoxyethylene ether and maleic anhydride to obtain reaction intermediate II, and the general structural formula of the reaction intermediate II is: Among them, R1 is an alkyl group with 8 to 12 carbon atoms; n is 20; 3) Add reaction intermediate II to reaction intermediate I, mix and react to obtain the in-situ cold recycling asphalt emulsifier.

3. The preparation method according to claim 2, characterized in that, The molar ratio of the alkylphenol polyoxyethylene ether, isopropanol, maleic anhydride, polyamine compound, and acrylic compound is 1:3 - 10:1.00 - 1.08:1.00 - 1.30:1.00 - 1.

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4. The preparation method according to claim 2, characterized in that, The alkylphenol polyoxyethylene ether is: Among them, R1 is an alkyl group with 8 to 12 carbon atoms; n is 20.

5. The preparation method according to claim 2, wherein The polyamine compound is triethylenetetramine, tetraethylenepentamine, diethylenetriamine, ethylenediamine, N-aminoethylpiperazine, β-hydroxyethyl ethylenediamine.

6. The preparation method according to claim 2, characterized in that, The acrylic compound is acrylic acid, acrolein or acrylamide.

7. The preparation method according to claim 2, characterized in that, In step 1), during the synthesis of reaction intermediate I, the reaction temperature is 65 - 82 °C, and the reaction time is 2 - 4 h; In step 2), during the synthesis of reaction intermediate II, the reaction temperature is 90 - 100 °C, and the reaction time is 2 - 4 h; In step 3), the reaction temperature is 65 - 82 °C, and the reaction time is 2 - 4 h.

8. The preparation method according to claim 2, characterized in that, Specifically, it includes the following steps: (1) Add the polyamine compound and isopropanol to a reaction vessel, then add the acrylic compound. After adding, stir and react at 65 - 82 °C for 2 - 4 h to obtain reaction intermediate I; (2) Add the alkylphenol polyoxyethylene ether and maleic anhydride to another reaction vessel, heat and stir, and stir and react at 90 - 100 °C for 2 - 4 h to obtain reaction intermediate II; (3) Add reaction intermediate II to reaction intermediate I, and stir and react at 65 - 82 °C for 2 - 4 h to obtain the in-situ cold recycling asphalt emulsifier.

9. A preparation method of a cationic in-situ cold recycled emulsified asphalt, characterized in that It includes the following steps: The dosage of the in-situ cold recycling asphalt emulsifier described in claim 1 is 1.5 - 3.0% of the total mass of the prepared cationic in-situ cold recycling emulsified asphalt. The in-situ cold recycling asphalt emulsifier described in claim 1 is added with water to prepare an asphalt emulsifier aqueous solution, and the pH value is adjusted to 2.0 - 3.0 with industrial hydrochloric acid and heated to 60.0 - 70.0 °C to obtain an asphalt emulsifier soap solution. The heated asphalt and the asphalt emulsifier soap solution are emulsified by a colloid mill to prepare a cationic in-situ cold recycling emulsified asphalt.

10. Application of the in-situ cold recycling asphalt emulsifier described in claim 9 in cationic in-situ cold recycling emulsified asphalt: The waste asphalt mixture, newly added aggregates, cement, water, cationic in-situ cold recycling emulsified asphalt, and SBR latex are mixed and spread according to the ratio to form a new asphalt pavement meeting the road use performance.

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