Compound emulsified asphalt as well as preparation method and application thereof

Abstract

The invention provides compound emulsified asphalt as well as a preparation method and application thereof. The compound emulsified asphalt comprises the following components in parts by weight: 40-65 parts of asphalt; 0.75 to 3.0 parts of an anionic emulsifier, and 0.75 to 3.0 parts of a nonionic emulsifier. Compared with the prior art in which a single emulsifier is adopted, the method for improving the performance of the emulsified asphalt is researched, the anionic emulsifier and the nonionic emulsifier are compounded, the stability of the obtained emulsified asphalt can be remarkably improved, and the emulsified asphalt has the advantage of long-period storage stability. The obtained compound emulsified asphalt is applied to the aspect of waterproof paint, and the performance of the emulsified asphalt can be well reflected.

Description

Technical Field

[0001] The invention belongs to the technical field of emulsified asphalt, and specifically relates to a compound emulsified asphalt and a preparation method and application thereof. Background Art

[0002] Emulsified asphalt is a mixture of three states, consisting of asphalt, water and emulsifier, so its stability is poor. At room temperature, asphalt and water will separate to varying degrees, resulting in stratification. This not only affects the use of emulsified asphalt, but may also lead to the abandonment of emulsified asphalt. Therefore, the problem of room temperature storage of emulsified asphalt has attracted widespread attention from researchers.

[0003] At present, the stability of emulsified asphalt can be improved by controlling the temperature and shear force during the emulsification process; using advanced emulsification equipment and processes; using different stabilizers; or optimizing the composition and structure of the base asphalt. However, there are no reports on improving the stability of emulsified asphalt by using compound emulsifiers.

[0004] Therefore, it is of great significance to provide an emulsified asphalt formula to improve the storage stability and application effect of the emulsified asphalt. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a compound emulsified asphalt and a preparation method and application thereof. The compound emulsified asphalt has better stability than other common asphalts and has the advantage of long-term storage stability.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a compound emulsified asphalt comprising, by weight, 40 to 65 parts of asphalt; 0.75 to 3.0 parts of anionic emulsifier; and 0.75 to 3.0 parts of nonionic emulsifier.

[0008] Preferably, the anionic emulsifier is an anionic slow-breaking emulsifier.

[0009] Preferably, the nonionic emulsifier is a fatty alcohol emulsifier and / or a polyvinyl alcohol emulsifier.

[0010] Preferably, the anionic emulsifier is selected from any one or more of Jinyang A3T1, Jinyang AFF2 or Shengquan L5.

[0011] Preferably, the nonionic emulsifier is selected from any one or more of betaine, OP-10 emulsifier or Shengquan SD-3.

[0012] Preferably, the asphalt is road petroleum asphalt.

[0013] Preferably, the compounded emulsified asphalt also includes 0.01 to 0.1 parts of a stabilizer.

[0014] Preferably, the stabilizer is selected from any one or more of cellulose ether, carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose or hydroxypropyl methyl cellulose.

[0015] Preferably, the compound emulsified asphalt comprises, by mass fraction: 40-65 wt % of asphalt, 1.0-3.0 wt % of anionic emulsifier, 1.0-3.0 wt % of nonionic emulsifier, 0.01-0.1 wt % of stabilizer, and the balance of water.

[0016] In a second aspect, the present invention provides a method for preparing the above-mentioned composite emulsified asphalt, comprising the following steps:

[0017] The anionic emulsifier and the nonionic emulsifier are mixed with water and then adjusted with alkali to obtain a soap solution;

[0018] The soap solution is heated and mixed with an optional stabilizer to obtain a mixture, and the mixture is mixed with the heated asphalt and ground to obtain a compounded emulsified asphalt.

[0019] Preferably, the alkali adjustment is carried out using an alkaline solution, and the alkaline solution is a sodium hydroxide solution.

[0020] Preferably, the soap solution is heated to 50-60°C.

[0021] Preferably, the asphalt is heated to 135-145°C.

[0022] In a third aspect, the present invention provides a waterproof coating comprising the above-mentioned compound emulsified asphalt.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention provides a composite emulsified asphalt, which comprises 40 to 65 parts of asphalt, 0.75 to 3.0 parts of anionic emulsifier, and 0.75 to 3.0 parts of nonionic emulsifier by weight. The present invention adopts the composite of anionic emulsifier and nonionic emulsifier, which can produce a synergistic effect of improving emulsification effect and stability, thereby significantly improving the stability of the obtained emulsified asphalt, and has the advantage of being able to be stored stably for a long period of time. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0026] In view of the problem of poor storage stability of emulsified asphalt in the prior art, the present invention provides a compound emulsified asphalt, which comprises 40 to 65 parts of asphalt, 0.75 to 3.0 parts of anionic emulsifier, and 0.75 to 3.0 parts of nonionic emulsifier by weight.

[0027] In the present invention, the compound emulsified asphalt includes 40 to 65 parts of asphalt by weight, such as 40 parts, 45 parts, 50 parts, 55 parts, 60 parts or 65 parts.

[0028] In some embodiments of the present invention, the asphalt is preferably road petroleum asphalt, and its penetration is generally 50-100 dmm, that is, it can be selected from any one or more of road petroleum asphalts numbered 30, 50, 70, and 90. In certain specific embodiments of the present invention, road asphalt No. 70 with a penetration of 60-80 dmm is selected, which can be recorded as: base asphalt 70#.

[0029] The present invention has no particular limitation on the source of the road petroleum asphalt, and it may be a common commercial product.

[0030] In the present invention, the compound emulsified asphalt includes 0.75 to 3.0 parts of anionic emulsifier by weight, such as 0.75, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75 or 3.0 parts.

[0031] In the present invention, the anionic emulsifier is preferably an anionic slow-cracking emulsifier. On the one hand, the emulsified asphalt made with the slow-cracking emulsifier has good storage stability, which means that it can maintain its performance unchanged for a certain period of time and is convenient for storage and transportation; on the other hand, the slow-cracking emulsifier is usually relatively low in price, which can effectively reduce production costs.

[0032] In some embodiments of the present invention, the anionic emulsifier is selected from any one or more of Jinyang A3T1, Jinyang AFF2 or Shengquan L5, more preferably Shengquan L5. The main active ingredient in the anionic emulsifier is sodium lignin sulfonate.

[0033] In the present invention, the compound emulsified asphalt includes 0.75 to 3.0 parts of non-ionic emulsifier by weight, such as 0.75, 1.0, 1.25, 1.5, 1.75, 2.0, 2.25, 2.5, 2.75 or 3.0 parts.

[0034] In the present invention, the anionic emulsifier is a fatty alcohol emulsifier and / or a polyvinyl alcohol emulsifier. Specifically, in some embodiments of the present invention, the nonionic emulsifier is selected from any one or more of betaine, OP-10 emulsifier or Shengquan SD-3, preferably Shengquan SD-3.

[0035] It should be noted that in the prior art, a single anionic emulsifier is used to match asphalt, but the stability is relatively low and it is easy to break the emulsion, and non-ionic emulsifiers are rarely used to match asphalt. In the present invention, anionic emulsifiers and non-ionic emulsifiers are compounded and added to asphalt, and it is found that the storage stability of emulsified asphalt can be significantly improved synergistically, and it has the advantage of long-term (such as 6 months) storage.

[0036] Specifically, the mixed use of anionic emulsifiers and nonionic emulsifiers can achieve better results than a single emulsifier, and the emulsification activity and surface activity can be stabilized for a long time. At the same time, the composite emulsifier combines the advantages of a single emulsifier and can achieve complementary performance in some aspects, thereby better meeting market demand.

[0037] In some embodiments of the present invention, the mass ratio of the anionic emulsifier to the anionic emulsifier is generally (1~3):(1~3), such as 1:1, 1:2, 1:3, 2:1, 2:3, 3:1, 3:2, etc., preferably 1:1, 1:3, 3:1, and more preferably 1:3.

[0038] To further improve the stability of the emulsified asphalt, in some preferred embodiments of the present invention, the compounded emulsified asphalt further includes 0.01 to 0.1 parts of a stabilizer, such as 0.01 parts, 0.03 parts, 0.05 parts, 0.08 parts or 0.1 parts, etc. The stabilizer is selected from any one or more of cellulose ether, carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose or hydroxypropyl methyl cellulose, preferably carboxymethyl cellulose and / or cellulose ether.

[0039] The present invention has no particular limitation on the source of the stabilizer, and any common commercially available stabilizer may be used.

[0040] In summary, in some specific embodiments of the present invention, the compound emulsified asphalt includes, by mass fraction: 40-65 wt% of asphalt, 0.75-3.0 wt% of anionic emulsifier, 0.75-3.0 wt% of nonionic emulsifier, 0.01-0.1 wt% of stabilizer, and the balance of water; preferably includes 45-60 wt% of asphalt, 0.75-2.25 wt% of anionic emulsifier, 0.75-2.25 wt% of nonionic emulsifier, 0.03-0.06 wt% of stabilizer, and the balance of water. The present invention has no special restrictions on the water, and deionized water well known to those skilled in the art can be used.

[0041] The present invention also provides a method for preparing the above-mentioned composite emulsified asphalt, comprising the following steps:

[0042] The anionic emulsifier and the nonionic emulsifier are mixed with water and then adjusted with alkali to obtain a soap solution;

[0043] The soap solution is heated and mixed with an optional stabilizer to obtain a mixture, and the mixture is mixed with the heated asphalt and ground to obtain a compounded emulsified asphalt.

[0044] According to the present invention, firstly, anionic emulsifier and nonionic emulsifier are mixed with water, and then alkali is adjusted to obtain soap solution. The alkali adjustment can be carried out with an alkaline solution, generally a sodium hydroxide solution. In the present invention, the soap solution is preferably heated to 50-60° C., and mixed with an optional stabilizer to obtain a mixture for use. The mixing is preferably carried out under stirring conditions until the mixture of the soap solution and the stabilizer is uniformly dissolved.

[0045] Then, the mixture is mixed with heated asphalt, the asphalt is preferably heated to 135-145°C, and then ground to obtain a compound emulsified asphalt. The grinding is preferably carried out in a colloid mill. The grinding time is generally 60 seconds, and can also be reasonably adjusted according to actual conditions, such as 50 seconds, 65 seconds, 70 seconds, etc.

[0046] In some embodiments of the present invention, the method for preparing the above-mentioned composite emulsified asphalt comprises the following steps:

[0047] a) Heat the asphalt to 135~145℃ and set aside;

[0048] b) Prepare soap solution with anionic emulsifier and nonionic emulsifier according to the proportion and water, and adjust the alkali for use;

[0049] c) Heat the soap solution to 50-60°C, add the stabilizer and stir until evenly dissolved, set aside;

[0050] d) preheating the asphalt and the soap solution to corresponding temperatures, respectively, and then grinding them to obtain anionic emulsified asphalt;

[0051] There is no order restriction for step a) and step b).

[0052] Wherein, the alkali adjustment can be carried out by using sodium hydroxide solution as an auxiliary agent to adjust the pH of the soap solution.

[0053] It can be seen that the preparation method of the above-mentioned composite emulsified asphalt provided by the present invention has a simple process, easily controllable conditions, and is suitable for large-scale production.

[0054] After testing, it was found that the compounded emulsified asphalt provided by the present invention has excellent stability and has the advantage of being able to be stored stably for a long period of time.

[0055] Based on this, the present invention also provides a waterproof coating, and the above technical solution involves a compound emulsified asphalt.

[0056] To further illustrate the present invention, the following examples are used to provide a detailed description. The slow-cracking L5 emulsifier and the nonionic SD-3 emulsifier used in the following examples of the present invention are provided by Jinan Shengquan Group Co., Ltd.; the nonionic op-10 emulsifier is provided by Shandong Zibo Haijie Chemical Co., Ltd.; and the slow-cracking A3T1 emulsifier is provided by Jiangsu Jinyang New Materials Technology Co., Ltd.

[0057] Example 1

[0058] This embodiment provides a composite asphalt, which is prepared from the following components in percentage by weight: 60 wt% asphalt, 0.75 wt% slow-cracking L5 emulsifier, 2.25 wt% non-ionic SD-3 emulsifier, 0.03 wt% stabilizer, and the balance of water. The stabilizer is Jinyang 104H stabilizer.

[0059] The preparation method is as follows:

[0060] a) adding water to the two emulsifiers in the above-mentioned compounding ratio and mixing them, and adjusting the alkali to obtain an alkaline soap solution;

[0061] b) After heating the soap solution, add the stabilizer in proportion, stir and mix at 50-60°C for 30 minutes, and then heat for later use;

[0062] c) Heat the asphalt to 135-145°C and the soap solution to 50-60°C. First add the soap solution to the colloid mill, start the circulation, and then pour the asphalt into the colloid mill at a uniform speed. Emulsified asphalt is obtained after 60 seconds.

[0063] Example 2

[0064] This embodiment provides a composite asphalt, which is prepared from the following components in percentage by weight: 60 wt% asphalt, 1.5 wt% slow-cracking L5 emulsifier, 1.5 wt% non-ionic SD-3 emulsifier, 0.03 wt% stabilizer, and the balance water. The stabilizer is Jinyang 104H stabilizer.

[0065] The preparation method of the anionic emulsified asphalt is as follows:

[0066] a) adding water to the two emulsifiers in the above-mentioned compounding ratio and mixing them, and adjusting the alkali to obtain an alkaline soap solution;

[0067] b) After heating the soap solution, add the stabilizer in proportion, stir and mix at 50-60°C for 30 minutes, and then heat for later use;

[0068] c) Heat the asphalt to 135-145°C, heat the soap solution to 50-60°C, and shear it through a colloid mill for 60 seconds to obtain emulsified asphalt.

[0069] Example 3

[0070] This embodiment provides a composite asphalt, which is prepared from the following components in percentage by weight: 60 wt% of asphalt, 2.25 wt% of slow-cracking L5 emulsifier, 0.75 wt% of non-ionic SD-3 emulsifier, 0.03 wt% of stabilizer, and the balance of water. The stabilizer is Jinyang 104H stabilizer.

[0071] The preparation method of the anionic emulsified asphalt is as follows:

[0072] a) adding water to the two emulsifiers in the above-mentioned compounding ratio and mixing them, and adjusting the alkali to obtain an alkaline soap solution;

[0073] b) After heating the soap solution, add the stabilizer in proportion, stir and mix at 50-60°C for 30 minutes and then heat for later use;

[0074] c) Heat the asphalt to 135-145°C, heat the soap solution to 50-60°C, and shear it through a colloid mill for 60 seconds to obtain emulsified asphalt.

[0075] Example 4

[0076] This embodiment provides a composite asphalt, which is prepared from the following components in percentage by weight: 60 wt% asphalt, 0.75 wt% slow-cracking L5 emulsifier, 2.25 wt% non-ionic SD-3 emulsifier, 0.01 wt% stabilizer, and the balance of water. The stabilizer is Jinyang 104H stabilizer.

[0077] The preparation method is as follows:

[0078] a) adding water to the two emulsifiers in the above-mentioned compounding ratio and mixing them, and adjusting the alkali to obtain an alkaline soap solution;

[0079] b) After heating the soap solution, add the stabilizer in proportion, stir and mix at 50-60°C for 30 minutes and then heat for later use;

[0080] c) Heat the asphalt to 135-145°C, heat the soap solution to 50-60°C, and shear it through a colloid mill for 60 seconds to obtain emulsified asphalt.

[0081] Example 5

[0082] This embodiment provides a composite asphalt, which is prepared from the following components in percentage by weight: 60 wt% asphalt, 0.75 wt% slow-cracking L5 emulsifier, 2.25 wt% non-ionic OP-10 emulsifier, 0.01 wt% stabilizer, and the balance of water. The stabilizer is Jinyang 104H stabilizer.

[0083] The preparation method is as follows:

[0084] a) adding water to the two emulsifiers in the above-mentioned compounding ratio and mixing them, and adjusting the alkali to obtain an alkaline soap solution;

[0085] b) After heating the soap solution, add the stabilizer in proportion, stir and mix at 50-60°C for 30 minutes and then heat for later use;

[0086] c) Heat the asphalt to 135-145°C, heat the soap solution to 50-60°C, and shear it through a colloid mill for 60 seconds to obtain emulsified asphalt.

[0087] Example 6

[0088] This embodiment provides a composite asphalt, which is prepared from the following components in percentage by weight: 60 wt% asphalt, 0.75 wt% slow-cracking A3T1 emulsifier, 2.25 wt% non-ionic SD-3 emulsifier, 0.01 wt% stabilizer, and the balance water. The stabilizer is Jinyang 104H stabilizer.

[0089] The preparation method is as follows:

[0090] a) adding water to the two emulsifiers in the above-mentioned compounding ratio and mixing them, and adjusting the alkali to obtain an alkaline soap solution;

[0091] b) After heating the soap solution, add the stabilizer in proportion, stir and mix at 50-60°C for 30 minutes and then heat for later use;

[0092] c) Heat the asphalt to 135-145°C, heat the soap solution to 50-60°C, and shear it through a colloid mill for 60 seconds to obtain emulsified asphalt.

[0093] Example 7

[0094] This embodiment provides a composite asphalt, which is prepared from the following components in percentage by weight: 60 wt% asphalt, 0.75 wt% slow-cracking A3T1 emulsifier, 2.25 wt% non-ionic OP-10 emulsifier, 0.01 wt% stabilizer, and the balance of water. The stabilizer is Jinyang 104H stabilizer.

[0095] The preparation method is as follows:

[0096] a) adding water to the two emulsifiers in the above-mentioned compounding ratio and mixing them, and adjusting the alkali to obtain an alkaline soap solution;

[0097] b) After heating the soap solution, add the stabilizer in proportion, stir and mix at 50-60°C for 30 minutes and then heat for later use;

[0098] c) Heat the asphalt to 135-145°C, heat the soap solution to 50-60°C, and shear it through a colloid mill for 60 seconds to obtain emulsified asphalt.

[0099] Comparative Example 1

[0100] This comparative example provides an emulsified asphalt, which is prepared from the following components in percentage by weight: 60 wt% asphalt, 3.0 wt% anionic slow-cracking L5 emulsifier, 0.03 wt% stabilizer, and the balance of water. The stabilizer is Jinyang 104H stabilizer.

[0101] The preparation method is as follows:

[0102] a) Add water to the anionic slow-cracking L5 emulsifier in proportion and mix, and adjust the alkali to obtain an alkaline soap solution;

[0103] b) After heating the soap solution, add the stabilizer in proportion, stir and mix at 50-60°C for 30 minutes and then heat for later use;

[0104] c) Heat the asphalt to 135-145°C, heat the soap solution to 50-60°C, and shear it through a colloid mill for 60 seconds to obtain emulsified asphalt.

[0105] Comparative Example 2

[0106] This comparative example provides an emulsified asphalt, which is prepared from the following components in percentage by weight: 60 wt% asphalt, 3.0 wt% nonionic SD-3 emulsifier, 0.03 wt% stabilizer, and the balance water. The stabilizer is Jinyang 104H stabilizer.

[0107] The preparation method is as follows:

[0108] a) Add water to the emulsifier in proportion and mix, and adjust the alkali to obtain an alkaline soap solution;

[0109] b) After heating the soap solution, add the stabilizer in proportion, stir and mix at 50-60°C for 30 minutes and then heat for later use;

[0110] c) Heat the asphalt to 135-145°C, heat the soap solution to 50-60°C, and shear it through a colloid mill for 60 seconds to obtain emulsified asphalt.

[0111] Performance Testing

[0112] The emulsified asphalt prepared in the above-mentioned embodiments and comparative examples was tested according to the technical specification for highway asphalt pavement construction JTG40-2004. The test results are shown in Table 1.

[0113] Table 1

[0114]

[0115] As can be seen from Table 1, in Comparative Examples 1 and 2, when a single emulsifier is used to emulsify the emulsified asphalt, the emulsification effect is poor, and the storage stability does not meet the index requirements, and it cannot be stored for a long period of time. When the composite emulsifier in Examples 1 to 7 of the present invention is used, the emulsification effect of the emulsified asphalt can be greatly improved, and the storage stability of the emulsified asphalt is improved. Moreover, when the L5 emulsifier and the emulsifier SD-3 are composited, the emulsification effect is better and the stability of the emulsified asphalt is better.

[0116] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite emulsified asphalt, characterized in that: The composition comprises 40 to 65 parts of asphalt, 0.75 to 3.0 parts of anionic emulsifier and 0.75 to 3.0 parts of nonionic emulsifier by weight.

2. The composite emulsified asphalt according to claim 1, characterized in that: The anionic emulsifier is an anionic slow-cracking emulsifier; The nonionic emulsifier is a fatty alcohol emulsifier and / or a polyvinyl alcohol emulsifier.

3. The composite emulsified asphalt according to claim 1 or 2, characterized in that: The anionic emulsifier is selected from any one or more of Jinyang A3T1, Jinyang AFF2 or Shengquan L5; The nonionic emulsifier is selected from any one or more of betaine, OP-10 emulsifier or Shengquan SD-3.

4. The composite emulsified asphalt according to any one of claims 1 to 3, characterized in that The asphalt is road petroleum asphalt.

5. The composite emulsified asphalt according to any one of claims 1 to 4, characterized in that The compounded emulsified asphalt also includes 0.01 to 0.1 parts of a stabilizer.

6. The composite emulsified asphalt according to claim 5, characterized in that: The stabilizer is selected from any one or more of cellulose ether, carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose or hydroxypropyl methyl cellulose.

7. The composite emulsified asphalt according to claim 5 or 6, characterized in that: The compound emulsified asphalt comprises, by mass fraction, 40-65 wt % of asphalt, 1.0-3.0 wt % of anionic emulsifier, 1.0-3.0 wt % of nonionic emulsifier, 0.01-0.1 wt % of stabilizer, and the balance of water.

8. A method for preparing a composite emulsified asphalt as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: The anionic emulsifier and the nonionic emulsifier are mixed with water and then adjusted with alkali to obtain a soap solution; The soap solution is heated and mixed with an optional stabilizer to obtain a mixture, and the mixture is mixed with the heated asphalt and ground to obtain a compounded emulsified asphalt.

9. The preparation method according to claim 8, characterized in that: The alkali adjustment is carried out using an alkaline solution, and the alkaline solution is a sodium hydroxide solution; The soap solution is heated to 50-60° C. The asphalt is heated to 135-145°C.

10. A waterproof coating, characterized in that: It includes the compounded emulsified asphalt described in any one of claims 1 to 7 or the compounded emulsified asphalt prepared according to the preparation method described in claim 8 or 9.

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