CN112480699A - Emulsified asphalt stabilizer, emulsified asphalt and preparation method thereof - Google Patents
Emulsified asphalt stabilizer, emulsified asphalt and preparation method thereof Download PDFInfo
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- CN112480699A CN112480699A CN202011414953.4A CN202011414953A CN112480699A CN 112480699 A CN112480699 A CN 112480699A CN 202011414953 A CN202011414953 A CN 202011414953A CN 112480699 A CN112480699 A CN 112480699A
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- emulsified asphalt
- stabilizer
- emulsifier
- asphalt
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
- C08L95/005—Aqueous compositions, e.g. emulsions
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- Civil Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
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Abstract
The invention provides an emulsified asphalt stabilizer, emulsified asphalt and a preparation method thereof, belonging to the field of road materials, wherein the emulsified asphalt stabilizer comprises the following raw materials in percentage by mass: 50-60% of cellulose ether, 35-45% of inorganic thixotropic agent and 2-7% of auxiliary emulsifier; the cellulose ether is selected from one or more of carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose; the inorganic thixotropic agent is selected from one or more of kaolin, bentonite, sepiolite and attapulgite; the auxiliary emulsifier is one or more selected from cetyl alcohol, beeswax, stearic acid, and stearyl alcohol. The stabilizer is formed by compounding the cellulose ether, the inorganic thixotropic agent and the co-emulsifier, can improve the transportation and storage stability of the emulsified asphalt, has high compatibility and excellent temperature resistance and acid and alkali resistance, and provides a better carrier for downstream products.
Description
Technical Field
The invention belongs to the field of road materials, and particularly relates to an emulsified asphalt stabilizer, in addition, the invention also relates to emulsified asphalt comprising the emulsified asphalt stabilizer and a preparation method of the emulsified asphalt.
Background
The emulsified asphalt is an oil-in-water or water-in-oil emulsion obtained by melting asphalt under heating and dispersing the asphalt in an aqueous solution containing an emulsifier and an auxiliary agent in the form of fine particles under the action of mechanical stirring. The emulsified asphalt has the advantages of saving energy, improving construction conditions, reducing construction cost and the like, can effectively reduce the problems of excessive asphalt aging and a large amount of volatilization of carcinogenic benzopyrone caused by high-temperature heating, and particularly greatly promotes the development of the emulsified asphalt along with the gradual improvement of the waterproof requirement of infrastructure and the rapid development of road slurry seal and micro-surfacing.
In the process of implementing the invention, the inventor finds that the prior emulsified asphalt at least has the following defects:
1. when the emulsified asphalt is stored and transported, the emulsified asphalt can be skinned on the inner wall of the tank body for a long time, and even can be precipitated, namely the existing emulsified asphalt has the defect of poor stability, so that the emulsified asphalt cannot be transported for a long distance and stored for a long time.
2. Various waterproof coating products prepared by taking emulsified asphalt as a raw material and adding pigment fillers and coating additives are poor in compatibility, for example, the emulsified asphalt is demulsified after the pigment fillers or the additives are added, and precipitates are generated after the emulsified asphalt is successfully prepared and stored.
Disclosure of Invention
Based on the above background problems, the present invention aims to provide an emulsified asphalt stabilizer which can improve the stability of emulsified asphalt, has high compatibility, and is applicable not only to cationic emulsified asphalt but also to anionic emulsified asphalt and modified asphalt. The addition of the stabilizer not only provides guarantee for the transportation and long-term storage of the emulsified asphalt, but also lays a good foundation for various coating products taking the emulsified asphalt as a raw material; another object of the present invention is to provide an emulsified asphalt comprising the above emulsified asphalt stabilizer and a preparation method thereof.
In order to achieve the above object, on one hand, the embodiment of the present invention provides a technical solution:
an emulsified asphalt stabilizer comprises the following raw materials in percentage by mass:
50-60% of cellulose ether, 35-45% of inorganic thixotropic agent and 2-7% of auxiliary emulsifier.
In one embodiment, the cellulose ether is selected from one or more of carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose.
Preferably, the cellulose ether is hydroxyethyl cellulose.
In one embodiment, the inorganic thixotropic agent is selected from one or more of kaolin, high purity bentonite, sepiolite, attapulgite.
Preferably, the inorganic thixotropic agent is high-purity bentonite.
In one embodiment, the co-emulsifier is selected from one or more of cetyl alcohol, beeswax, stearic acid, stearyl alcohol.
Preferably, the co-emulsifier is cetyl alcohol.
On the other hand, the embodiment of the invention also provides emulsified asphalt, which comprises the emulsified asphalt stabilizer.
In one embodiment, the emulsified asphalt comprises the following raw materials in percentage by mass:
50-60% of asphalt, 0.8-2% of emulsifier, 0.1-0.3% of emulsified asphalt stabilizer and the balance of water.
In addition, the embodiment of the invention also provides a preparation method of the emulsified asphalt, which comprises the following steps:
heating the asphalt to the temperature of 120 ℃ and 150 ℃ for later use;
adding water into a preparation tank, controlling the temperature to be 55-80 ℃, adding an emulsified asphalt stabilizer under the stirring condition, adding an emulsifier after the emulsified asphalt stabilizer is fully dispersed in the water, and obtaining a soap solution for later use after the emulsifier is fully dispersed;
and (3) feeding the soap solution and the heated asphalt into a colloid mill according to a certain proportion, grinding and shearing, and obtaining the emulsified asphalt after the asphalt is stably and uniformly dispersed in the soap solution.
Compared with the prior art, the invention has the following effects:
1. the stabilizer is formed by compounding cellulose ether, an inorganic thixotropic agent and an auxiliary emulsifier, wherein the cellulose ether has favorable temperature resistance, film forming property, water retention property, thickening property and compatibility, the inorganic thixotropic agent has thixotropy and is cooperated with the cellulose ether to realize the aim of preventing precipitation, and the auxiliary emulsifier is cooperated with the emulsifier in the emulsified asphalt to ensure that the asphalt can be stably dispersed in a soap solution, so that the stability of the emulsified asphalt is improved, the compatibility is high, the stabilizer is not only suitable for cationic emulsified asphalt, but also can be applied to anionic emulsified asphalt and modified asphalt, and in addition, a better carrier can be provided for downstream products.
2. Hydroxyethyl cellulose is preferred as the cellulose ether of the invention, because the hydroxyethyl cellulose has no gel temperature, the temperature resistance is better, and the hydroxyethyl cellulose is nonionic and has high compatibility; in addition, hydroxyethyl cellulose has strong colloid protection capability.
3. According to the invention, the cellulose ether and the inorganic thixotropic agent are compounded, so that the synergistic effect can be realized, and compared with the single use of the cellulose ether, the production cost can be greatly reduced; in addition, the addition of a small amount of the stabilizer can properly reduce the dosage of the emulsifier in the production process of the emulsified asphalt, thereby reducing the industrial cost.
Detailed Description
In order to overcome the defects that the existing emulsified asphalt is poor in stability and not beneficial to long-distance transportation and long-term storage, the embodiment of the invention provides the emulsified asphalt stabilizer which is formed by compounding the cellulose ether, the inorganic thixotropic agent and the co-emulsifier, can improve the stability of the emulsified asphalt, is high in compatibility, is suitable for cationic emulsified asphalt, can be applied to anionic emulsified asphalt and modified asphalt, and can provide a better carrier for downstream products.
The invention will be elucidated by means of specific embodiments.
Example 1
An emulsified asphalt stabilizer is composed of the following raw materials in parts by mass:
50% of carboxymethyl cellulose, 45% of kaolin and 5% of stearic acid.
Example 2
An emulsified asphalt stabilizer is composed of the following raw materials in parts by mass:
30% of hydroxypropyl methyl cellulose, 25% of methyl cellulose, 38% of high-purity bentonite and 7% of stearyl alcohol.
Example 3
An emulsified asphalt stabilizer is composed of the following raw materials in parts by mass:
55% of hydroxyethyl cellulose, 40% of high-purity bentonite and 5% of cetyl alcohol.
Example 4
An emulsified asphalt stabilizer is composed of the following raw materials in parts by mass:
20% of hydroxyethyl cellulose, 20% of carboxymethyl cellulose, 20% of methyl cellulose, 20% of sepiolite, 15% of kaolin and 5% of cetyl alcohol.
Example 5
An emulsified asphalt stabilizer is composed of the following raw materials in parts by mass:
60% of hydroxyethyl cellulose, 38% of attapulgite and 2% of beeswax.
Example 6
The emulsified asphalt comprises the following raw materials in percentage by mass:
50% of asphalt, 1% of emulsifier, 0.1% of emulsified asphalt stabilizer of example 3 and 48.9% of water.
The preparation method of the emulsified asphalt of the embodiment comprises the following steps:
(1) putting the asphalt into a heating tank to be heated to 120 ℃ for standby;
(2) injecting water into a preparation tank, starting a stirrer, controlling the temperature to be 55 ℃, adding an emulsified asphalt stabilizer, stirring for 1-2h, adding an emulsifier after the emulsified asphalt stabilizer is fully dispersed in the water, and stirring for about 1h until the emulsifier is fully dispersed to obtain a soap solution for later use;
(3) and (3) feeding the heated asphalt obtained in the step (1) and the soap solution obtained in the step (2) into a high-speed rotary colloid mill in proportion for grinding and shearing to stably and uniformly disperse the asphalt in the soap solution to obtain emulsified asphalt, and introducing the obtained emulsified asphalt into a storage tank for storage.
The emulsifier used in this example was alkyl polyethylene oxide ether.
Example 7
The emulsified asphalt comprises the following raw materials in percentage by mass:
60% of asphalt, 2% of emulsifier, 0.3% of emulsified asphalt stabilizer of example 3 and 37.7% of water.
The preparation method of the emulsified asphalt of the embodiment comprises the following steps:
(1) putting the asphalt into a heating tank to be heated to 150 ℃ for standby;
(2) injecting water into a preparation tank, starting a stirrer, controlling the temperature to be 80 ℃, adding an emulsified asphalt stabilizer, stirring for 1-2h, adding an emulsifier after the emulsified asphalt stabilizer is fully dispersed in the water, and stirring for about 1h until the emulsifier is fully dispersed to obtain a soap solution for later use;
(3) and (3) feeding the heated asphalt obtained in the step (1) and the soap solution obtained in the step (2) into a high-speed rotary colloid mill in proportion for grinding and shearing to stably and uniformly disperse the asphalt in the soap solution to obtain emulsified asphalt, and introducing the obtained emulsified asphalt into a storage tank for storage.
The emulsifier used in this example was alkyl polyethylene oxide ether.
Comparative example 1
The emulsified asphalt comprises the following raw materials in percentage by mass:
50% of asphalt, 1% of alkyl polyoxyethylene ether and 49% of water.
The preparation method of the emulsified asphalt of comparative example 1 includes the following steps:
(1) putting the asphalt into a heating tank to be heated to 120 ℃ for standby;
(2) injecting water into a preparation tank, starting a stirrer, controlling the temperature to be 55 ℃, adding an emulsifier, and stirring for about 1h until the emulsifier is fully dispersed to obtain a soap solution for later use;
(3) and (3) feeding the heated asphalt obtained in the step (1) and the soap solution obtained in the step (2) into a high-speed rotary colloid mill in proportion for grinding and shearing to stably and uniformly disperse the asphalt in the soap solution to obtain emulsified asphalt, and introducing the obtained emulsified asphalt into a storage tank for storage.
Comparative example 2
The emulsified asphalt comprises the following raw materials in percentage by mass:
50% of asphalt, 1% of alkyl polyoxyethylene ether, 0.1% of hydroxyethyl cellulose and 48.9% of water.
The emulsified asphalt of comparative example 2 was prepared in the same manner as in example 6.
Comparative example 3
An emulsified asphalt stabilizer is composed of the following raw materials in parts by mass:
50% of asphalt, 1% of alkyl polyoxyethylene ether, 0.055% of hydroxyethyl cellulose, 0.045% of high-purity bentonite and 48.9% of water.
The emulsified asphalt of comparative example 3 was prepared in the same manner as in example 6.
In order to test the performance of the emulsified asphalt stabilizer of the present invention, the stabilized performance of the emulsified asphalt prepared in example 6, comparative example 1, comparative example 2 and comparative example 3 was tested by the following specific test methods:
the emulsified asphalt prepared in example 6, comparative example 1, comparative example 2 and comparative example 3 was filtered, the filtered emulsified asphalt of example 6 was slowly injected into test tube a, the filtered emulsified asphalt of comparative example 1 was slowly injected into test tube B, the filtered emulsified asphalt of comparative example 2 was slowly injected into test tube C, the filtered emulsified asphalt prepared in comparative example 3 was slowly injected into test tube D, the amount of emulsified asphalt added to each of test tubes a, B, C and D was 250mL, and then the orifice of each test tube was plugged with a plug.
It should be noted that the emulsified pitches in example 6, comparative example 1, comparative example 2 and comparative example 3 were injected simultaneously, and bubbles were not attached to the branch pipes of the test pipes at the time of injection.
Then placing the test tube A, the test tube B, the test tube C and the test tube D on a test tube rack, standing for 30 days and nights at constant temperature (20 ℃), and measuring the stability after standing for 1D, 5D, 15D and 30D respectively; after the completion of the standing, the test was carried out in the following manner.
Slightly pulling out the plug of the upper branch pipe orifice, discharging about 50g of the sample from the upper branch pipe orifice, connecting the sample into an evaporation residue test container A, pulling out the plug of the lower branch pipe orifice, discharging all the samples above the lower branch pipe, fully shaking up the samples below the lower branch pipe, discharging about 50g of the residual sample in the test pipe from the lower branch pipe, connecting the residual sample into an evaporation residue test container B, and measuring the evaporation residue content P according to the method of the emulsified asphalt evaporation residue content testAAnd PB。
The storage stability of the emulsified asphalt was calculated according to the following formula, taking its absolute value:
Ss＝|PA-PB|
in the formula, SsStorage stability of the sample,%;
PAfor the upper tube portion sample evaporated residue content after storage,%;
PBfor the upper tube portion sample evaporated residue content after storage,%;
the test results are shown below, and table 1 is a table of storage stability data for each sample.
TABLE 1 storage stability data Table for each sample
As can be seen from table 1, the emulsified asphalt of comparative example 1 (test tube B) has no stabilizer added, and the stability of the product is poor, and the storage stability of the emulsified asphalt of example 6 (test tube a) after 5 days of storage is 0.9%, which is significantly improved compared to comparative example 1, indicating that the stabilizer of the present invention can significantly improve the stability of the emulsified asphalt.
As can be seen from table 1, the emulsified asphalt without the stabilizer showed significant delamination after 15 days, while the emulsified asphalt prepared in example 6 still maintained the stability at 1.5% after standing for 30 days, which indicates that the stabilizer of the present application can make the emulsified asphalt store for a long time without delamination and precipitation.
Comparing the storage stability of the emulsified asphalt in example 6, comparative example 2 (test tube C) and comparative example 3 (test tube D), it can be seen that the cellulose ether, the inorganic thixotropic agent and the co-emulsifier have better stabilizing effect when they are compounded than when they are used in one component or two components, which indicates that the cellulose ether, the inorganic thixotropic agent and the co-emulsifier have synergistic effect.
It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.
Claims (10)
1. The emulsified asphalt stabilizer is characterized by comprising the following raw materials in percentage by mass:
50-60% of cellulose ether, 35-45% of inorganic thixotropic agent and 2-7% of auxiliary emulsifier.
2. The emulsified asphalt stabilizer according to claim 1, wherein the cellulose ether is selected from one or more of carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, and hydroxypropyl methyl cellulose.
3. The emulsified asphalt stabilizer according to claim 2, wherein the cellulose ether is hydroxyethyl cellulose.
4. The emulsified asphalt stabilizer according to claim 1, wherein the inorganic thixotropic agent is selected from one or more of kaolin, high-purity bentonite, sepiolite and attapulgite.
5. The emulsified asphalt stabilizer according to claim 4, wherein the inorganic thixotropic agent is high-purity bentonite.
6. The emulsified asphalt stabilizer according to claim 1, wherein the co-emulsifier is one or more selected from cetyl alcohol, beeswax, stearic acid, stearyl alcohol.
7. The emulsified asphalt stabilizer as claimed in claim 6, wherein the co-emulsifier is cetyl alcohol.
8. An emulsified asphalt comprising the emulsified asphalt stabilizer according to any one of claims 1 to 7.
9. The emulsified asphalt according to claim 8, which is characterized by comprising the following raw materials in percentage by mass:
50-60% of asphalt, 0.8-2% of emulsifier, 0.1-0.3% of emulsified asphalt stabilizer and the balance of water.
10. The preparation method of the emulsified asphalt is characterized by comprising the following steps:
heating the asphalt to the temperature of 120 ℃ and 150 ℃ for later use;
adding water into a preparation tank, controlling the temperature to be 55-80 ℃, adding an emulsified asphalt stabilizer under the stirring condition, adding an emulsifier after the emulsified asphalt stabilizer is fully dispersed in the water, and obtaining a soap solution for later use after the emulsifier is fully dispersed;
and (3) feeding the soap solution and the heated asphalt into a colloid mill according to a certain proportion, grinding and shearing, and obtaining the emulsified asphalt after the asphalt is stably and uniformly dispersed in the soap solution.
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| CN202011414953.4A CN112480699A (en) | 2020-12-04 | 2020-12-04 | Emulsified asphalt stabilizer, emulsified asphalt and preparation method thereof |
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2020
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| CN103205204A (en) * | 2013-04-17 | 2013-07-17 | 昆明风行防水材料有限公司 | High-strength rubber asphalt waterproof paint and preparation method thereof |
| CN103525108A (en) * | 2013-10-24 | 2014-01-22 | 北京同华道路养护有限责任公司 | High modulus cold-mixed asphalt as well as preparation method and mixture thereof |
| CN105802259A (en) * | 2016-03-24 | 2016-07-27 | 湖州新奥克化工有限公司 | High-weather-resistance emulsified asphalt for CA mortar and preparation method thereof |
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