CN113773662A - Anionic asphalt and preparation method thereof - Google Patents
Anionic asphalt and preparation method thereof Download PDFInfo
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- CN113773662A CN113773662A CN202111192141.4A CN202111192141A CN113773662A CN 113773662 A CN113773662 A CN 113773662A CN 202111192141 A CN202111192141 A CN 202111192141A CN 113773662 A CN113773662 A CN 113773662A
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Abstract
The application provides anionic asphalt and a preparation method thereof, wherein the anionic asphalt is prepared by mixing and emulsifying the following raw materials: 50 wt% -60 wt% of asphalt; 1.0-2.5 wt% of emulsifier; 0.1 to 1.0 weight percent of anti-settling agent; the balance of water; the emulsifier is a fast-breaking anionic emulsifier; the main component of the anti-settling agent is a polyurea compound. The specific anti-settling agent is added into the anionic asphalt system, so that the storage stability of the emulsified asphalt is greatly improved while the viscosity of the emulsified asphalt is not influenced, the use effect is better, the system stability is good, the energy is saved, the consumption is reduced and the cost is reduced during production. The indexes of the obtained emulsified asphalt meet the technical requirements of JTG-F40-2004 'technical Specification for construction of road asphalt pavement' PA-1 emulsified asphalt; in addition, the preparation method provided by the invention is simple in process and suitable for large-scale production and application.
Description
Technical Field
The application relates to the technical field of asphalt production, in particular to anionic asphalt and a preparation method thereof, or emulsified asphalt and a preparation method thereof, and specifically relates to a method for improving the stability of anionic emulsified asphalt while maintaining the viscosity of the anionic emulsified asphalt.
Background
The asphalt can be classified into petroleum asphalt, coal asphalt, natural asphalt, and the like. The asphalt is a solid or semi-solid viscous substance at normal temperature, has good adhesion and waterproof properties, and is mainly applied to asphalt pavement, building waterproofing and other aspects. The traditional asphalt road needs to be constructed at high temperature, the asphalt is easily burnt to human bodies due to overhigh temperature, and asphalt smoke generated at high temperature causes great harm to the human bodies and the environment. In view of the disadvantages, it is a great trend to find road asphalt which can be constructed at normal temperature or low temperature, and from this, the emulsified asphalt technology is produced, and the emulsified asphalt has the characteristics of safety, environmental protection and energy saving compared with hot asphalt in a plurality of road construction applications.
The prior art of emulsified asphalt is to melt asphalt by heating, and to disperse the asphalt in a fine micro-droplet state in an aqueous solution containing an emulsifier and an auxiliary agent by the mechanical action of a colloid mill, wherein asphalt particles are uniformly dispersed, thereby obtaining a stable emulsion. Wherein, the emulsifier is mainly divided into nonionic and ionic surfactants. The emulsified asphalt has good fluidity at normal temperature, can be constructed at low temperature, improves the convenience of the construction process, reduces the construction cost, and can avoid the pollution of asphalt smoke generated in the asphalt heating process to the environment and the human body, thereby achieving the effects of saving, safety and environmental protection. The emulsified asphalt is mainly applied to pavement maintenance, such as cold mixing materials, slurry seal and the like, and can also be used for water prevention of roofs and bridges.
The storage stability of the emulsified asphalt has a crucial influence on the production, storage, construction and the like of the emulsified asphalt. However, at the present stage, the anionic emulsified asphalt is easy to delaminate and precipitate, and is easy to separate after a long time, so that the adhesion with stone materials is insufficient, and even the phenomenon of mismatching with the stone materials occurs. Therefore, an organic stabilizer (for example, a quaternary ammonium salt stabilizer) is usually added to the anionic emulsified asphalt to improve the storage stability. However, the addition of such organic stabilizers tends to make the viscosity of the emulsified asphalt very high, which is not good for the use effect. Therefore, it is important to improve the storage stability of the emulsified asphalt without affecting the properties such as viscosity and the like of the emulsified asphalt and the application thereof.
Disclosure of Invention
In view of the above, the application provides an anionic asphalt and a preparation method thereof, and the anionic emulsified asphalt provided by the invention has good storage stability and viscosity, and is beneficial to construction application.
The invention provides anionic asphalt, which is prepared by mixing and emulsifying the following raw materials:
50 wt% -60 wt% of asphalt;
1.0-2.5 wt% of emulsifier;
0.1 to 1.0 weight percent of anti-settling agent;
the balance of water;
the emulsifier is a fast-breaking anionic emulsifier; the main component of the anti-settling agent is a polyurea compound.
In a preferred embodiment herein, the emulsifier is selected from one or more of carboxylate type emulsifiers and sulfonate type emulsifiers.
In the preferred embodiment of the application, the anti-settling agent is an aqueous auxiliary agent, and the content of the main component is more than 50%; the addition amount of the anti-settling agent is 0.1-0.6 wt%.
In a preferred embodiment of the present application, the asphalt is road petroleum asphalt.
In a preferred embodiment of the present application, the bitumen has a penetration at 25 ℃ of from 50dmm to 100dmm and a softening point of from 40 ℃ to 55 ℃.
The embodiment of the application provides a preparation method of the anionic asphalt, which comprises the following steps:
s1) dissolving the emulsifier and the anti-settling agent into water together to obtain a mixed solution;
s2) heating the asphalt, mixing the asphalt with the mixed solution, and emulsifying to obtain the anionic asphalt.
In a preferred embodiment of the present application, step S1) is specifically: mixing and heating water, an emulsifier and an anti-settling agent to obtain a mixed solution; the heating temperature is 40-70 ℃.
In a preferred embodiment of the present application, step S2) is specifically: and heating the asphalt to 135-145 ℃, mixing the asphalt and the mixed solution in a colloid mill, and stirring at a high speed for emulsification to obtain the anionic asphalt.
Compared with the prior art, the invention provides anionic emulsified asphalt which is prepared from the following raw materials: 50-60 wt% of asphalt, 1.0-2.5 wt% of emulsifier, 0.1-1.0 wt% of anti-settling agent and the balance of water; the emulsifier is a quick-cracking anionic emulsifier, and the anti-settling agent is a polyurea type auxiliary agent. The specific anti-settling agent is added into the anionic emulsified asphalt system, so that the storage stability of the emulsified asphalt is greatly improved while the viscosity of the emulsified asphalt is not influenced, the anionic emulsified asphalt system has a better using effect and good system stability, and saves energy, reduces consumption and reduces cost during production. The indexes of the obtained emulsified asphalt meet the technical requirements of JTG-F40-2004 'technical Specification for construction of road asphalt pavement' PA-1 emulsified asphalt; in addition, the preparation method provided by the invention is simple in process, easy to operate and control, and suitable for large-scale production and application.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides anionic asphalt which is prepared by mixing and emulsifying the following raw materials:
50 wt% -60 wt% of asphalt;
1.0-2.5 wt% of emulsifier;
0.1 to 1.0 weight percent of anti-settling agent;
the balance of water;
the emulsifier is a fast-breaking anionic emulsifier; the main component of the anti-settling agent is a polyurea compound.
Aiming at the problem of overlarge viscosity of emulsified asphalt caused by adding an organic stabilizer when the stability of the emulsified asphalt is improved in the prior art, the invention provides the emulsified asphalt and the preparation method thereof, so that the storage stability of the emulsified asphalt can be obviously improved while the original viscosity of the emulsified asphalt is maintained.
The emulsified asphalt is anionic asphalt or anionic emulsified asphalt; in the embodiment of the invention, the emulsified asphalt is prepared from the following components in percentage by mass (50-60): (50-40), wherein the mass ratio of the asphalt to the soap liquid is more preferably 60: 40.
in the invention, the asphalt is preferably road petroleum asphalt; road petroleum asphalt produced by petroleum refineries well known to those skilled in the art may be used. In the present invention, the penetration of the asphalt at 25 ℃ is preferably from 50dmm to 100dmm, more preferably 70 dmm; the softening point of the asphalt is preferably 40-55 ℃, and more preferably 50 ℃; the ductility of the asphalt at 10 ℃ is more than 100 cm. In the preferred embodiment of the present invention, the asphalt is sea-charm 70# grade a asphalt (the source is Shandong sea-charm asphalt Co., Ltd.), and other commercially available 70# grade a asphalt can also be used.
In the above embodiment of the present invention, the soap solution is an aqueous solution containing an emulsifier and an anti-settling agent; wherein the emulsifier is a fast-breaking anionic emulsifier, and the content is preferably 1.0-2.0 wt%, and more preferably 2.0 wt%. The water is not particularly limited in the present invention, and deionized water well known to those skilled in the art may be used.
The fast-cracking anionic emulsifier belongs to an anionic surfactant and is of a fast-cracking type, namely the emulsion breaking speed is high after the emulsion is injected into mineral materials and mixed into a mixture, and the specific determination of the emulsion breaking speed is shown in T0658-1993 emulsified asphalt emulsion breaking speed test. In the present invention, the emulsifier is preferably selected from one or more of carboxylate type emulsifiers and sulfonate type emulsifiers, the main technical indicators are: pH 6.5-9.5, carbon number is selected between 12-20; in particular, a single emulsifier may be used.
The examples of the present invention employ commercially available fast-breaking anionic emulsifier products such as: jinyang A412 emulsifier and A411 emulsifier produced by Jiangsu Jinyang new material science and technology Limited and Noliong E62 emulsifier produced by Nolion enthusiastic chemical (Shanghai) Limited. The main technical indexes of the Jinyang A412 emulsifier are as follows: the content of active substances is more than or equal to 30 percent, 1: 100 alkaline aqueous solution, pH value of 8.5-9.5, rapid demulsification speed, and brown yellow viscous liquid (jelly-like below 10 deg.C).
Some embodiments of the invention employ jinyang a412 emulsifier; the asphalt emulsifier is an anionic surfactant, and is a special emulsifier for spraying and quick setting, which can rapidly produce water and break emulsion. When the emulsified asphalt is produced, the alkali is adjusted, and various road petroleum asphalts can be emulsified. Under the condition of double-gun spraying, the special emulsified asphalt can quickly produce water, demulsify and solidify, and is used for water-proof and corrosion-proof engineering of tunnels, bridges, houses, walls, roofs, basements and the like; various performance indexes of the emulsified asphalt produced by the asphalt emulsifier meet JC/T2317-2015 standard.
Other embodiments of the invention employ jinyang a411 emulsifier; the asphalt emulsifier is an anionic surfactant, and is a special asphalt emulsifier with high cost performance for spraying and quick setting. When the emulsified asphalt is produced, the alkali is adjusted, and various road petroleum asphalts can be emulsified. Under the condition of double-gun spraying, the special emulsified asphalt can be quickly demulsified and solidified, and can be used for water-proofing and corrosion-proofing engineering of tunnels, bridges, houses, wall surfaces, roofs, basements and the like. Various performance indexes of the emulsified asphalt produced by the asphalt emulsifier meet the JC/T2317-2015 standard; the asphalt with increased flame retardant property can be used in waterproof and anticorrosion projects of coal mine tunnels and roadways, and can effectively solve the problem of underground water leakage. The emulsifier can well play the roles of emulsification and spraying quick setting in the production process of the water-based non-cured rubber asphalt waterproof coating.
In the soap solution according to the preferred embodiment of the present invention, the anti-settling agent is a polyurea-type auxiliary agent, and the main component of the anti-settling agent is a polyurea compound. The polyurea is a compound generated by the reaction of isocyanate component and amino compound, has wide application, and can be used in the fields of water resistance, corrosion resistance, surface decoration and the like. The anti-settling agent is a rheological control agent in a paint formula and comprises organic and inorganic substances. Preferably, the content of the polyurea anti-settling agent in the soap solution is 0.1 to 1.0 weight percent, and more preferably 0.1 to 0.3 weight percent. In the preferred embodiment of the application, the anti-settling agent is an aqueous auxiliary agent, and the content of the main component is more than 50%; the water-based paint is suitable for water-based paint, and after the water-based paint is mixed into a system, the auxiliary agent can establish pseudoplastic fluid through thixotropy, so that sedimentation and sagging are prevented through the thixotropy.
The embodiment of the invention adopts the commercial polyurea anti-settling agent products, such as: w613 anti-settling agent (the component is a high molecular compound, the appearance of a light yellow sticky solution and the active component is 50 percent) produced by the New Material Limited of Hongyang, Foshan mountain, and the solvent is N-methylpyrrolidone), PICO1420 anti-settling agent produced by the agricultural science and technology Limited of Shandong Jingbo, and the like. The emulsified asphalt provided by the invention realizes better interaction mainly by adding the specific anti-settling agent, solves the problem of poor storage stability of the emulsified asphalt on the basis of keeping the viscosity of crude oil, and can save energy, reduce consumption and reduce production cost during production.
The embodiment of the application provides a preparation method of the anionic asphalt, which comprises the following steps:
s1) dissolving the emulsifier and the anti-settling agent into water together to obtain a mixed solution;
s2) heating the asphalt, mixing the asphalt with the mixed solution, and emulsifying to obtain the anionic asphalt.
In the process of preparing emulsified asphalt, the inventive example first mixes water, an emulsifier and an anti-settling agent, and heats, thereby obtaining a soap solution. In the process, the heating temperature can be 40-70 ℃, and preferably 50-60 ℃. Or, the water can be heated to 40-70 ℃ to ensure that the temperature of the soap liquid is 40-70 ℃.
According to the invention, a colloid mill is preheated, and the soap solution is added, and high-speed circulation is carried out for 1-2 min; and finally, adding preheated asphalt, and stirring at a high speed for 1-2 min to obtain the emulsified asphalt. In this process, the preheated asphalt can be prepared in advance, i.e. the asphalt is preheated to 135-145 ℃. The emulsification process is carried out in a colloid mill; the emulsifying time is 0.5 min-5 min.
In the preparation process, the temperature of the soap liquid and the asphalt needs to be ensured, the emulsifier and the anti-settling agent are not uniformly dissolved due to too low temperature of the soap liquid, the emulsifying effect is reduced, the emulsifier is easily inactivated due to too high temperature, and the emulsifier is easily splashed due to high temperature in the shearing process of a colloid mill to cause damage to a human body; if the temperature of the asphalt is too low, the asphalt is not easy to mix with soap liquid, so that the particles are not uniformly dispersed, if the temperature is too high, the asphalt is partially aged, and besides splashing is easily caused in the shearing process of a colloid mill, emulsified asphalt is also easy to break emulsion due to high temperature.
Specifically, the emulsified asphalt is prepared from the following raw materials:
the anionic emulsified asphalt comprises the following components in percentage by mass (45-35): (55-65) the soap solution and the asphalt; the soap solution comprises the following components: 1.0 wt% -2.0 wt% of emulsifier; 0.1 wt% -1.0 wt% of anti-settling agent; the balance of water. The anionic emulsified asphalt is prepared by mainly adding the anti-settling agent, so that the storage stability of the emulsified asphalt is greatly improved, the existing viscosity of the emulsified asphalt is kept, the emulsified asphalt has a better application effect, the technical requirements of PA-1 emulsified asphalt in JTG _ F40-2004 technical Specification for road asphalt pavement construction are met, and the product has a wide application prospect.
In order to better understand the technical content of the invention, specific examples are provided below to further illustrate the invention. All the proportions in the application are based on the mass of the emulsified asphalt and are the proportion of the total mass of the emulsified asphalt. For example, the emulsifier accounts for 1% of the total mass of the emulsified asphalt. Soap solution: asphalt is 40%: 60 percent.
Example 1
(1) Dissolving Jinyang A412 emulsifier and anti-settling agent W613 in water at 60 ℃ according to the addition amounts of 2.0 wt% and 0.1 wt% respectively to obtain soap solution;
(2) asphalt (Haiyun No. 70# grade A asphalt, same as in example below) was heated to 140 ℃ and the soap solution (60 ℃) obtained in step (1) was mixed with the asphalt as described above: asphalt 40 wt%: emulsifying in a colloid mill for 1min at the proportion of 60 wt% to obtain the anionic emulsified asphalt.
Example 2
(1) Dissolving Jinyang A412 emulsifier and an anti-settling agent PICO1420 in water at 60 ℃ according to the addition amounts of 2.0 wt% and 0.1 wt% respectively to obtain soap liquid;
(2) heating asphalt to 140 ℃, and mixing the soap solution (60 ℃) obtained in the step (1) with the asphalt according to the following ratio: asphalt 40 wt%: emulsifying in a colloid mill for 1min at the proportion of 60 wt% to obtain the anionic emulsified asphalt.
Example 3
(1) Dissolving Jinyang A411 emulsifier and anti-settling agent W613 in water at 60 ℃ according to the addition amounts of 2.0 wt% and 0.1 wt% respectively to obtain soap solution;
(2) heating asphalt to 140 ℃, and mixing the soap solution (60 ℃) obtained in the step (1) with the asphalt according to the following ratio: asphalt 40 wt%: emulsifying in a colloid mill for 1min at the proportion of 60 wt% to obtain the anionic emulsified asphalt.
Example 4
(1) Dissolving a Noron E62 emulsifier and an anti-settling agent W613 in water at 60 ℃ according to the addition amounts of 2.0 wt% and 0.1 wt% respectively to obtain a soap solution;
(2) heating asphalt to 140 ℃, and mixing the soap solution (60 ℃) obtained in the step (1) with the asphalt according to the following ratio: asphalt 40 wt%: emulsifying in a colloid mill for 1min at the proportion of 60 wt% to obtain the anionic emulsified asphalt.
Comparative example 1
(1) Dissolving Jinyang A412 emulsifier and PN organic stabilizer (produced by Shandong Piny New Material Co., Ltd.) in water of 60 deg.C according to the addition amount of 2.0 wt% and 0.1 wt% respectively to obtain soap solution;
(2) heating asphalt to 140 ℃, and mixing the soap solution (60 ℃) obtained in the step (1) with the asphalt according to the following ratio: asphalt 40 wt%: emulsifying in a colloid mill for 1min at the proportion of 60 wt% to obtain the anionic emulsified asphalt.
Comparative example 2
(1) Dissolving Jinyang A412 emulsifier and WSG-104H organic stabilizer (produced by Shanghai Wang Fine chemical Co., Ltd.) in water at 60 deg.C according to the addition of 2.0 wt% and 0.1 wt% respectively to obtain soap solution;
(2) heating asphalt to 140 ℃, and mixing the soap solution (60 ℃) obtained in the step (1) with the asphalt according to the following ratio: asphalt 40 wt%: emulsifying in a colloid mill for 1min at the proportion of 60 wt% to obtain the anionic emulsified asphalt.
Comparative example 3
(1) Dissolving Jinyang A411 emulsifier and WSG-104H organic stabilizer in water at 60 ℃ according to the addition amounts of 2.0 wt% and 0.1 wt% respectively to obtain soap solution;
(2) heating asphalt to 140 ℃, and mixing the soap solution (60 ℃) obtained in the step (1) with the asphalt according to the following ratio: asphalt 40 wt%: emulsifying in a colloid mill for 1min at the proportion of 60 wt% to obtain the anionic emulsified asphalt.
Comparative example 4
(1) Dissolving Nockong E62 emulsifier and WSG-104H organic stabilizer in water at 60 deg.C according to the addition of 2.0 wt% and 0.1 wt% respectively to obtain soap solution;
(2) heating asphalt to 140 ℃, and mixing the soap solution (60 ℃) obtained in the step (1) with the asphalt according to the following ratio: asphalt 40 wt%: emulsifying in a colloid mill for 1min at the proportion of 60 wt% to obtain the anionic emulsified asphalt.
The performance index detection of the emulsified asphalt prepared in the example is carried out, and the result is as follows:
TABLE 1 Performance index of the emulsified asphalt prepared in the example of the present invention
Analysis of the data shows that the Engra viscosity and storage stability indexes of the emulsified asphalt prepared by adopting the Jinyang A412 emulsifier and adding the anti-settling agent W613 and the anti-settling agent PIOC1420 in the example 1 and the example 2 respectively meet the PA-1 technical requirements (the storage stability is less than 1% in 1 day, and the storage stability is less than 5% in 5 days); in the embodiment 3 and the embodiment 4, the Jinyang A411 emulsifier and the Noke-on E62 emulsifier are respectively adopted, and the W613 anti-settling agent is added, so that the Engela viscosity, the storage stability and other indexes of the prepared emulsified asphalt meet the technical requirements of PA-1.
In comparative examples 1 and 2, the A412 emulsifier is adopted to respectively add the organic stabilizer PN and the WSG104H, the storage stability and other indexes of the prepared emulsified asphalt meet the technical requirements of PA-1, but the Engra viscosity index does not meet the technical requirements of PA-1 (the construction and use of the coating are influenced by overlarge viscosity); in comparative example 3 and comparative example 4, the storage stability index of the emulsified asphalt prepared by adopting Jinyang A411 emulsifier and Noke-on E62 emulsifier respectively and adding WSG-104H organic stabilizer meets the technical requirement of PA-1, but the Engra viscosity index does not meet the technical requirement of PA-1. The comparative examples used different emulsifiers and serve to demonstrate that this W613 anti-settling agent was not effective only for emulsified bitumen prepared with one emulsifier.
Comprehensive analysis shows that in the process of preparing the anionic emulsified asphalt, the organic stabilizer is added, so that the viscosity of the emulsified asphalt can be improved, the particle settling speed is reduced, the index of the storage stability of the anionic emulsified asphalt can be effectively improved, but the viscosity of the emulsified asphalt is too high and does not meet the technical requirement of PA-1, and if the polyurea anti-settling agent is added in the process of preparing the anionic emulsified asphalt, the storage stability of the anionic emulsified asphalt can be effectively improved while the Engra viscosity of the emulsified asphalt is kept to be in accordance with PA-1.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. The anionic asphalt is characterized by being prepared by mixing and emulsifying the following raw materials:
50 wt% -60 wt% of asphalt;
1.0-2.5 wt% of emulsifier;
0.1 to 1.0 weight percent of anti-settling agent;
the balance of water;
the emulsifier is a fast-breaking anionic emulsifier; the main component of the anti-settling agent is a polyurea compound.
2. The anionic asphalt of claim 1, wherein the emulsifier is selected from one or more of carboxylate type emulsifiers and sulfonate type emulsifiers.
3. The anionic asphalt according to claim 1, wherein the anti-settling agent is an aqueous auxiliary agent, and the content of the main component is more than 50%; the addition amount of the anti-settling agent is 0.1-0.6 wt%.
4. The anionic asphalt of any one of claims 1 to 3, wherein the asphalt is road petroleum asphalt.
5. The anionic asphalt of claim 4, wherein the asphalt has a penetration at 25 ℃ of 50dmm to 100dmm and a softening point of 40 ℃ to 55 ℃.
6. A process for the preparation of anionic bitumen as claimed in any one of claims 1 to 5, comprising the steps of:
s1) dissolving the emulsifier and the anti-settling agent into water together to obtain a mixed solution;
s2) heating the asphalt, mixing the asphalt with the mixed solution, and emulsifying to obtain the anionic asphalt.
7. The preparation method according to claim 6, wherein the step S1) is specifically: mixing and heating water, an emulsifier and an anti-settling agent to obtain a mixed solution; the heating temperature is 40-70 ℃.
8. The method according to claim 7, wherein step S2) is specifically: and heating the asphalt to 135-145 ℃, mixing the asphalt and the mixed solution in a colloid mill, and stirring at a high speed for emulsification to obtain the anionic asphalt.
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