Asphalt odorless microcapsule as well as preparation method and application thereof
By encapsulating the liquid odorant into solid microcapsules, the problems of odorant volatilization and transportation difficulties are solved, stability and long-term storage capacity are achieved, and the application and promotion of odorant asphalt are promoted.
Patent Information
- Application Number
- CN202510244263.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2025-05-23
AI Technical Summary
Existing odorants are easy to evaporate, making them difficult to maintain for a long time and transport them from a long distance, hindering the promotion and application of odorous asphalt.
The liquid odorant is encapsulated into solid microcapsules, and the wall and core materials are prepared by reaction of components such as urea and formaldehyde solution to form a stable microcapsule structure.
It effectively solves the problem of volatile odorants, realizes the stability and long-term storage capacity of microcapsules, and promotes the application and promotion of odorous asphalt.
Smart Images
Figure CN120025692A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of asphalt modifiers, and in particular to asphalt odor-free microcapsules and a preparation method and application thereof. Background Art
[0002] When asphalt is used after being heated, a large amount of asphalt fume is generated, which has a serious impact on the surrounding environment and even affects people's health. Asphalt fume has a pungent smell and contains a variety of carcinogenic and strong carcinogenic substances such as benzopyrene, benzanthracene, carbazole, as well as harmful gases with pungent odors such as hydrogen sulfide, sulfur dioxide, and ammonia. These gases come from the volatilization of light components in asphalt or from the oxidation of some components of asphalt. While polluting the atmosphere, they are also harmful to human health.
[0003] In order to solve this problem, deodorants are now used to reduce the harm. The commonly used organic liquid deodorants are very compatible with asphalt and have a fresh smell. Their active groups can react with the small molecular substances volatilized in asphalt at a certain temperature to generate macromolecular substances to prevent their volatilization. Therefore, they can significantly reduce the emission of toxic and odorous gases at high temperatures of asphalt, improve the production of asphalt and the construction environment of asphalt pavement. However, deodorants are highly active and very volatile. After being added to asphalt, they are easy to react with the active components in asphalt. The deodorized asphalt produced is difficult to maintain for a long time and transport over long distances, which seriously hinders the promotion and application of deodorized asphalt. Summary of the invention
[0004] The purpose of the present invention is to provide an asphalt odor-free microcapsule and a preparation method and application thereof, so as to solve the problems existing in the above-mentioned background technology.
[0005] To achieve the above objectives, this application is implemented through the following technical solutions:
[0006] A bitumen odor-removing microcapsule is composed of the following components by mass: 10 parts of urea, 15-20 parts of formaldehyde solution, 80-100 parts of odor-removing agent, 0.8-1.0 part of dispersant, 650-800 parts of deionized water, 5-6 parts of alkaline agent, and 105-135 parts of acidic agent.
[0007] Furthermore, the deodorant is an alcohol deodorant or an aldehyde deodorant.
[0008] Furthermore, the dispersant is sodium dodecylbenzene sulfonate, the alkaline agent is triethanolamine, and the acidic agent is a 10 wt % citric acid solution.
[0009] A method for preparing any of the above-mentioned asphalt odor-free microcapsules, comprising the following steps:
[0010] Step 1) Add a mixture of urea and formaldehyde solution into a beaker, stir until the urea is dissolved, drop triethanolamine into the beaker to adjust the pH of the solution to 8.0-9.0, and stir continuously in a constant temperature water bath at 70° C. for 1 hour to prepare a wall material solution;
[0011] Step 2) Deionized water and sodium dodecylbenzene sulfonate are placed in another flask as a dispersant solution, and then the deodorant is poured into the dispersant solution and mixed, and the flask is placed in a water bath, the water bath temperature is adjusted to 60° C., and stirred for 30 min to obtain a core material emulsion;
[0012] Step 3) Add the wall material solution to the core material emulsion, add citric acid solution to adjust the solution pH to 2.5-3.0, then heat the water bath to 50-55°C, continue stirring for 2-3 hours, then heat to 65-70°C and continue stirring for 2-3 hours, let stand for 6-12 hours, then wash with deionized water and anhydrous ethanol, filter out the remaining product, and obtain a white powder, namely asphalt deodorizer microcapsules, after drying.
[0013] Furthermore, in the asphalt deodorant microcapsules, the deodorant content is 70% to 75%, and the melting temperature of the wall material is 135 to 150°C.
[0014] An application, use of any of the above-mentioned asphalt odor-purifying microcapsules in asphalt.
[0015] Furthermore, asphalt deodorizer microcapsules are directly added to the base asphalt to obtain environmentally friendly odorless asphalt.
[0016] Furthermore, when the asphalt deodorizer microcapsules are added to the base asphalt, the temperature of the base asphalt is controlled to be 120-130° C. and stirred for 30 minutes.
[0017] Furthermore, the amount of asphalt deodorizer microcapsules added to the environmentally friendly odorless asphalt is 0.07 to 0.4 wt%.
[0018] The beneficial effects of the present invention are:
[0019] 1. The present invention encapsulates the liquid deodorant into solid microcapsules, which effectively solves the problem that the deodorant is easy to volatilize and is inconvenient to transport over long distances.
[0020] 2. The asphalt deodorizer microcapsules of the present invention can be directly added to the base asphalt to produce smoke-suppressing and odor-free asphalt. After long-term storage or long-distance transportation, the high temperature of asphalt mixture production can be used to cause the capsules to melt and release the deodorizer, thereby reducing the smoke and odor generated during the asphalt mixture production process, solving the problem that the deodorizer is highly active and the deodorizing asphalt is difficult to store for a long time. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1This is a photo of the asphalt deodorant microcapsule of the present invention.
[0022] Figure 2 This is a photo of asphalt deodorizer capsules extracted from asphalt after the experiment. DETAILED DESCRIPTION
[0023] The technical solution of the present invention is described in detail below through examples. The following examples are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, but cannot be construed as limiting the technical solution of the present invention.
[0024] Example 1
[0025] A kind of asphalt deodorant microcapsule is prepared from the following components in parts by weight: 10 parts of urea, 15 parts of formaldehyde solution, 80 parts of alcohol deodorant, 0.8 parts of sodium dodecylbenzene sulfonate, 650 parts of deionized water, 5 parts of triethanolamine, and 105 parts of 10wt% citric acid solution; the preparation method thereof is as follows: step 1) adding a mixture of urea and formaldehyde solution into a beaker, stirring until the urea is dissolved, slowly dripping triethanolamine to adjust the pH value of the solution to 9.0, and continuously stirring for 1 hour in a constant temperature water bath at 70°C to prepare a wall material solution; step 2) putting deionized water and sodium dodecylbenzene sulfonate into another flask as a dispersant solution, then pouring the deodorant into the dispersant solution and mixing, putting the flask into a water bath, adjusting the water bath temperature to 60°C, and stirring for 30 minutes to obtain a core material emulsion; step 3) slowly adding the wall material solution into the core material, adding citric acid solution to adjust the pH value of the solution to 2.5, then slowly heating the water bath to 50°C, and continuing to stir for 2 h, then heated to 65 °C and stirred for 2 h, allowed to stand for 6 h, then washed with deionized water and anhydrous ethanol, the remaining product was filtered out and dried to obtain a white powder, namely, asphalt deodorant microcapsule 1 (attached Figure 1 ); When the deodorizing agent microcapsules are added to the asphalt, the asphalt temperature is controlled to be 120°C and stirred for 30 minutes to obtain an environmentally friendly deodorizing asphalt 1.
[0026] Comparative Example 1:
[0027] The following components in parts by weight were used to prepare deodorant microcapsules: 10 parts of urea, 15 parts of formaldehyde solution, 80 parts of alcohol deodorant, 0.7 parts of sodium dodecylbenzene sulfonate, 650 parts of deionized water, 5 parts of alkaline reagent, and 105 parts of acidic reagent; the rest was the same as in Example 1. During the implementation, the deodorant was not fully emulsified and demulsified in advance, and the wall material could not cover the deodorant to form capsules.
[0028] Comparative Example 2:
[0029] The following components in parts by weight were used to prepare deodorant microcapsules: 10 parts of urea, 15 parts of formaldehyde solution, 80 parts of alcohol deodorant, 0.8 parts of sodium dodecylbenzene sulfonate, 650 parts of deionized water, 4 parts of triethanolamine, and 105 parts of 10wt% citric acid solution; the rest was the same as in Example 1. During the implementation, the alkalinity of the solution was too low, resulting in too fast reaction of urea and formaldehyde, and the urea-formaldehyde resin wall material was precipitated in advance, and the deodorant could not be coated to form capsules.
[0030] Comparative Example 3:
[0031] The following components in parts by weight were used to prepare deodorant microcapsules: 10 parts of urea, 15 parts of formaldehyde solution, 80 parts of alcohol deodorant, 0.8 parts of sodium dodecylbenzenesulfonate, 650 parts of deionized water, 5 parts of triethanolamine, and 100 parts of 10wt% citric acid solution; the rest was the same as in Example 1. During the implementation, the alkalinity of the solution was too high, resulting in too slow reaction of urea and formaldehyde, slow deposition of wall material on the surface of the deodorant droplets, and difficulty in forming capsules.
[0032] Comparative Example 4:
[0033] Deodorant microcapsules were prepared using the following components in parts by weight: 10 parts of urea, 15 parts of formaldehyde solution, 70 parts of alcohol deodorant, 0.8 parts of sodium dodecylbenzenesulfonate, 650 parts of deionized water, 5 parts of triethanolamine, and 105 parts of 10wt% citric acid solution; the rest was the same as in Example 1, and asphalt deodorant microcapsules were obtained, wherein the deodorant content was 65%, which was relatively low.
[0034] Comparative Example 5:
[0035] The following components in parts by weight were used to prepare the deodorant microcapsules: 10 parts of urea, 15 parts of formaldehyde solution, 110 parts of alcohol deodorant, 0.8 parts of sodium dodecylbenzene sulfonate, 650 parts of deionized water, 5 parts of triethanolamine, and 105 parts of 10wt% citric acid solution; the rest was the same as in Example 1. During the implementation, the deodorant was used in too much amount and it was difficult to be completely covered by the wall material, resulting in waste of the deodorant.
[0036] Example 2
[0037] A kind of asphalt deodorant microcapsule is prepared from the following components in parts by weight: 10 parts of urea, 20 parts of formaldehyde solution, 100 parts of alcohol deodorant, 1.0 part of sodium dodecylbenzene sulfonate, 800 parts of deionized water, 6 parts of triethanolamine, and 135 parts of 10wt% citric acid solution; the preparation method thereof is as follows: step 1) adding a mixture of urea and formaldehyde solution into a beaker, stirring until the urea is dissolved, slowly dripping triethanolamine to adjust the pH value of the solution to 9.0, and continuously stirring for 1 hour in a constant temperature water bath at 70°C to prepare a wall material solution; step 2) putting deionized water and sodium dodecylbenzene sulfonate into another flask as a dispersant solution, then pouring the deodorant into the dispersant solution and mixing, putting the flask into a water bath, adjusting the water bath temperature to 60°C, and stirring for 30 minutes to obtain a core material emulsion; step 3) slowly adding the wall material solution into the core material, adding citric acid solution to adjust the pH value of the solution to 3.0, then slowly heating the water bath to 55°C, and continuing to stir for 3 hours. h, then heat to 70°C and continue stirring for 3h, let stand for 6h, then wash with deionized water and anhydrous ethanol, filter out the remaining product, and dry to obtain a white powder, namely, asphalt deodorizer microcapsule 2; when the deodorizer microcapsule is added to the asphalt, control the asphalt temperature to 130°C and stir for 30 minutes to obtain environmentally friendly deodorizing asphalt 2.
[0038] Example 3
[0039] A kind of asphalt deodorant microcapsule is prepared from the following components in parts by weight: 10 parts of urea, 18 parts of formaldehyde solution, 84 parts of aldehyde deodorant, 0.84 parts of sodium dodecylbenzene sulfonate, 672 parts of deionized water, 6 parts of triethanolamine, and 135 parts of 10wt% citric acid solution; the preparation method thereof is as follows: step 1) adding a mixture of urea and formaldehyde solution into a beaker, stirring until the urea is dissolved, slowly dripping triethanolamine to adjust the pH value of the solution to 9.0, and continuously stirring for 1 hour in a constant temperature water bath at 70°C to prepare a wall material solution; step 2) putting deionized water and sodium dodecylbenzene sulfonate into another flask as a dispersant solution, then pouring the deodorant into the dispersant solution and mixing, putting the flask into a water bath, adjusting the water bath temperature to 60°C, and stirring for 30 minutes to obtain a core material emulsion; step 3) slowly adding the wall material solution into the core material, adding citric acid solution to adjust the pH value of the solution to 3.0, then slowly heating the water bath to 55°C, and continuing to stir for 3 hours. h, then heat to 70°C and continue stirring for 3h, let stand for 6h, then wash with deionized water and anhydrous ethanol, filter out the remaining product, and dry to obtain a white powder, namely asphalt deodorizer microcapsule 3; when adding the deodorizer microcapsule to asphalt, control the asphalt temperature to 130°C and stir for 30 minutes to obtain environmentally friendly deodorizing asphalt 3.
[0040] Referring to the gas collection method of Construction and Building Materials 416 (2024) 135276, four asphalt samples, including the base asphalt of Example 1, the newly prepared environmentally friendly odor-free asphalt 1, the environmentally friendly odor-free asphalt 1 stored for 1 month, and the environmentally friendly odor-free asphalt prepared after the capsules were stored for 1 month, were heated at 165°C for 20 minutes. According to GB 15322.1-2019 "Point-type combustible gas detectors for industrial and commercial purposes", the concentrations of VOCs and H2S generated at the reaction device were detected using the GT-1000 portable composite gas detector (0-1000ppm) produced by Shenzhen Kerno Electronic Technology Co., Ltd. The test results are shown in Table 1. After the experiment, capsules ( Figure 2 ), and found that the capsule wall material had melted in the experiment to release the deodorant.
[0041] Table 1
[0042]
[0043] It can be seen from the test data in Table 1 that after adding the deodorant microcapsules, the total amount of VOCs released and the irritating gas H 2 The S release was significantly reduced. The environmentally friendly odor-free asphalt after being stored for one month and the environmentally friendly odor-free asphalt prepared after the capsules were stored for one month both had good smoke suppression and odor removal effects.
[0044] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A kind of asphalt odor-free microcapsule, characterized in that: It is composed of the following components by mass: 10 parts of urea, 15 to 20 parts of formaldehyde solution, 80 to 100 parts of deodorizer, 0.8 to 1.0 parts of dispersant, 650 to 800 parts of deionized water, 5 to 6 parts of alkaline agent, and 105 to 135 parts of acidic agent.
2. The asphalt odor-free microcapsules according to claim 1 are characterized in that: The deodorant is an alcohol deodorant or an aldehyde deodorant.
3. The asphalt odor-free microcapsule according to claim 1, characterized in that: The dispersant is sodium dodecylbenzene sulfonate, the alkaline agent is triethanolamine, and the acidic agent is a 10 wt % citric acid solution.
4. A method for preparing the asphalt odor-free microcapsules according to any one of claims 1 to 3, characterized in that: Use the following steps: Step 1) Add a mixture of urea and formaldehyde solution into a beaker, stir until the urea is dissolved, drop triethanolamine into the beaker to adjust the pH of the solution to 8.0-9.0, and stir continuously in a constant temperature water bath at 70° C. for 1 hour to prepare a wall material solution; Step 2) Deionized water and sodium dodecylbenzene sulfonate are placed in another flask as a dispersant solution, and then the deodorant is poured into the dispersant solution and mixed, and the flask is placed in a water bath, the water bath temperature is adjusted to 60° C., and stirred for 30 min to obtain a core material emulsion; Step 3) Add the wall material solution to the core material emulsion, add citric acid solution to adjust the solution pH to 2.5-3.0, then heat the water bath to 50-55°C, continue stirring for 2-3 hours, then heat to 65-70°C and continue stirring for 2-3 hours, let stand for 6-12 hours, then wash with deionized water and anhydrous ethanol, filter out the remaining product, and obtain a white powder, namely asphalt deodorizer microcapsules, after drying.
5. The method for preparing asphalt odor-free microcapsules according to claim 4, characterized in that: In the asphalt deodorant microcapsules, the deodorant content is 70% to 75%, and the melting temperature of the wall material is 135 to 150°C.
6. An application, characterized in that: Use of the asphalt odor-purifying microcapsules described in any one of claims 1 to 5 in asphalt.
7. The use according to claim 6, characterized in that: Asphalt deodorizer microcapsules are directly added to the base asphalt to obtain environmentally friendly odorless asphalt.
8. The use according to claim 7, characterized in that: When the asphalt deodorant microcapsules are added to the base asphalt, the temperature of the base asphalt is controlled to be 120-130° C. and stirred for 30 minutes.
9. The use according to claim 6, characterized in that: The amount of asphalt deodorizer microcapsules added to asphalt is 0.07-0.4 wt%.