Preparation method of asphalt warm mixing agent for acidic aggregate

Abstract

The invention belongs to the technical field of asphalt warm mixing agents, and particularly relates to a preparation method of an asphalt warm mixing agent for acidic aggregate. In order to solve the problem that in the prior art, a pavement paved by mixing acidic aggregate and asphalt is prone to water damage, the invention provides the preparation method of the asphalt warm mixing agent for the acidic aggregate, the preparation method comprises the following steps: heating and melting Fischer-Tropsch wax, carrying out wiped-film evaporation through a wiped-film evaporator, and condensing to obtain an intermediate product 1; heating and melting the intermediate product 1, performing reduced pressure distillation at different temperatures for multiple times, and collecting components to obtain an intermediate product 2; performing catalytic hydrogenation reaction on the intermediate product 2 to obtain an intermediate product 3; and mixing a coupling agent with the intermediate product 3, and uniformly stirring to obtain the asphalt warm mixing agent. The asphalt warm mixing agent prepared by the invention can effectively improve the interface adhesion performance of the matrix asphalt and the acidic aggregate, and avoids the problem of water damage caused by long-time use of a pavement.

Description

Technical Field

[0001] The invention belongs to the technical field of asphalt warm mix agents, and in particular relates to a method for preparing an asphalt warm mix agent for acidic aggregates. Background Art

[0002] my country has abundant reserves of granite, which has the advantages of high mechanical strength, good wear resistance, and strong fatigue resistance. For example, the application of granite in asphalt pavement can not only solve the problem of insufficient alkaline aggregate resources, but also effectively reduce the cost of the project and drive local economic development. However, granite is an acidic aggregate with hydrophilic and oleophobic properties. Without special process treatment such as modification, its adhesion to asphalt is extremely poor. It is difficult to ensure its water stability and durability when used as a road aggregate for paving asphalt pavement. It is very easy to have water damage such as looseness, falling particles, and potholes, which affects the comfort and safety of driving and seriously restricts the application and promotion of granite in asphalt pavement. Therefore, solving the adhesion problem of granite asphalt mixture and improving its water damage resistance and other road performance will have great significance and value for my country's highway construction and the transformation of new and old kinetic energy.

[0003] For example, a Chinese invention patent application discloses an asphalt warm mix agent [application number: 201810363615.9], which includes the following components: 4-6 parts of sodium dodecylbenzene sulfonate, 15-20 parts of zeolite additive, 8-12 parts of volcanic ash, 2-4 parts of sodium tripolyphosphate, 20-30 parts of warm mix agent base material, and 12-15 parts of auxiliary additives; the preparation method of the warm mix agent base material includes the following steps:

[0004] (1) Add maleic anhydride to acetone at a mass ratio of 1:5, stir and mix to obtain a mixture a, add benzylamine to acetone at a mass ratio of 1:7, stir and mix to obtain a stirred mixture b, add the stirred mixture b dropwise to the mixture a at a mass ratio of 5:6, stir and mix at 4050°C, filter and obtain a residue;

[0005] (2) taking 15-20 parts of filter residue, 25-30 parts of toluene, 30-40 parts of N,N-dimethylformamide, and 2-4 parts of p-toluenesulfonic acid by weight, heating to 120-130° C. and stirring to obtain a stirred mixture, adding deionized water at a weight ratio of 1:10 to the stirred mixture, letting it stand, filtering with suction, washing the filtered residue with distilled water, and drying to obtain a dried product, adding ethanol at a weight ratio of 2:5 to the dried product and mixing to obtain a mixed solution;

[0006] (3) adding octadecyl methacrylate and acrylamide in a mass ratio of 3:10:3 to the mixed solution, heating to 50-60° C. and stirring to mix, then adding azobisisobutyronitrile in an amount of 2-5% by mass of octadecyl methacrylate, stirring to mix at 70-80° C., and distilling under reduced pressure to obtain a warm mix agent base;

[0007] The preparation method of the auxiliary additive is as follows: sodium hypochlorite is added to deionized water in a mass ratio of 1:1, and then waste tire rubber powder is added in an amount 2-5 times the mass of the sodium hypochlorite, and the mixture is stirred at 1000 r / min, and then the mixture is heated to 45-50° C. at 800 W microwave and kept warm, and the auxiliary additive is obtained by filtering and drying the filter residue.

[0008] This invention application has the advantage of solving the problem that the current asphalt warm mix agent has low warm mix performance when the dosage is small and the viscosity reduction effect in the high temperature zone is poor, but it still does not solve the above problems. Summary of the invention

[0009] The purpose of the present invention is to provide a method for preparing an asphalt warm mix agent for acidic aggregates which can effectively improve the water stability of the pavement in view of the above problems.

[0010] In order to achieve the above object, the present invention adopts the following technical solutions:

[0011] A method for preparing a warm mix asphalt agent for acidic aggregates comprises the following steps:

[0012] Step 1: After heating and melting the Fischer-Tropsch wax, the Fischer-Tropsch wax is evaporated by a wiped film evaporator, and the intermediate product 1 is obtained after condensation;

[0013] Step 2: After heating and melting the intermediate product 1, performing reduced pressure distillation to obtain a heavy phase component 1 and a light phase component 1, discarding the light phase component 1 and collecting the heavy phase component 1;

[0014] Step 3: distill the heavy phase component 1 under reduced pressure to obtain a heavy phase component 2 and a light phase component 2, discard the light phase component 2 and collect the heavy phase component 2;

[0015] Step 4: subject the heavy phase component 2 to vacuum distillation until no bubbles are generated in the liquid phase, raise the distillation temperature to obtain a heavy phase component 3 and a light phase component 3, discard the heavy phase component 3 and collect the light phase component 3 to obtain an intermediate product 2;

[0016] Step 5: performing a catalytic hydrogenation reaction on the intermediate product 2 to obtain the intermediate product 3;

[0017] Step 6: Mix the coupling agent with the intermediate product 3, and stir evenly to obtain the asphalt warm mix agent.

[0018] In the above-mentioned method for preparing a warm mix asphalt agent for acidic aggregate, the evaporation temperature of the scraping film evaporation in step 1 is 150-200° C., the pressure is 100-500 Pa, and the scraping film rotation speed is 100-300 rpm.

[0019] In the above-mentioned method for preparing a warm mix asphalt agent for acidic aggregate, in the step 1, the condenser temperature of the scraped film evaporator is 70-80°C, and the cold well temperature is 0-40°C.

[0020] In the above-mentioned method for preparing a warm mix asphalt agent for acidic aggregate, the temperature of the vacuum distillation in step 2 is 200-240° C. and the pressure is 10-50 Pa.

[0021] In the above-mentioned method for preparing a warm mix asphalt agent for acidic aggregate, the temperature of the vacuum distillation in step 3 is 240-290° C. and the pressure is 5-50 Pa.

[0022] In the above-mentioned method for preparing a warm mix asphalt agent for acidic aggregate, the vacuum distillation temperature before heating in step 4 is 290-320° C. and the pressure is 5-50 Pa.

[0023] In the above-mentioned method for preparing a warm mix asphalt agent for acidic aggregate, the vacuum distillation temperature after heating in step 4 is 320-350° C. and the pressure is 5-50 Pa.

[0024] In the above-mentioned method for preparing a warm mix asphalt agent for acidic aggregate, the temperature of the catalytic hydrogenation in step 5 is 250-350°C, the pressure is 0.5-10MPa, and the catalyst is palladium carbon. The carbon number distribution of the obtained intermediate product 2 normal alkanes is roughly: 20%≤C41-C50≤40%, 25%≤C51-C60≤45%, about 5%-15% exceeds 61 carbons, and the molecular weight of the intermediate product 2 is about 600-1000.

[0025] In the above-mentioned method for preparing a warm mix asphalt agent for acidic aggregate, the acid value of the obtained intermediate product 3 is not greater than 5 mg KOH / g, and the pH value ranges from 7.5 to 9.

[0026] In the above-mentioned method for preparing a warm mix asphalt agent for acidic aggregate, the coupling agent is a titanate coupling agent 101, and the mass of the titanate coupling agent 101 is 20-50% of the mass of the intermediate product 3.

[0027] Compared with the prior art, the advantages of the present invention are:

[0028] 1. The asphalt warm mix agent prepared by the present invention can effectively improve the interfacial adhesion performance between the matrix asphalt and the acidic aggregate, and avoid the problem of water damage to the road surface after long-term use.

[0029] 2. The raw materials of the present invention are cheap and readily available, the production cost is low, and it is suitable for large-scale promotion and use. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with specific implementation methods.

[0031] Example 1

[0032] This embodiment provides a method for preparing an asphalt warm mix agent for acidic aggregate, comprising the following steps:

[0033] Step 1: After the Fischer-Tropsch wax is heated and melted, it is evaporated by a scraped film evaporator, the evaporation temperature of the scraped film evaporator is 200° C., the pressure is 500 Pa, the scraped film speed is 300 rpm, the condenser temperature is 80° C., the cold well temperature is 40° C., and the intermediate product 1 is obtained after condensation;

[0034] Step 2: After the intermediate product 1 is heated and melted, it is subjected to vacuum distillation at a temperature of 240° C. and a pressure of 50 Pa to obtain a heavy phase component 1 and a light phase component 1, the light phase component 1 is discarded and the heavy phase component 1 is collected;

[0035] Step 3: subjecting the heavy phase component 1 to vacuum distillation at a temperature of 290° C. and a pressure of 50 Pa to obtain a heavy phase component 2 and a light phase component 2, discarding the light phase component 2 and collecting the heavy phase component 2;

[0036] Step 4: subject the heavy phase component 2 to vacuum distillation at a temperature of 320° C. and a pressure of 50 Pa. When no bubbles are generated in the liquid phase, the distillation temperature is raised to 350° C. to obtain a heavy phase component 3 and a light phase component 3. The heavy phase component 3 is discarded and the light phase component 3 is collected to obtain an intermediate product 2.

[0037] Step 5: catalytically hydrogenate the intermediate product 2 at a temperature of 350° C. and a pressure of 10 MPa using palladium carbon as the catalyst to obtain the intermediate product 3;

[0038] Step 6: Mix the coupling agent with the intermediate product 3 and stir evenly to obtain an asphalt warm mix agent, wherein the coupling agent is a titanate coupling agent 101 , and the mass of the titanate coupling agent 101 is 50% of the mass of the intermediate product 3 .

[0039] The Fischer-Tropsch wax in this embodiment is refined Fischer-Tropsch wax FR100 produced by Zhejiang Huangxing Chemical Co., Ltd.

[0040] Example 2

[0041] This embodiment provides a method for preparing an asphalt warm mix agent for acidic aggregate, comprising the following steps:

[0042] Step 1: After the Fischer-Tropsch wax is heated and melted, it is evaporated by a scraped film evaporator, the evaporation temperature of the scraped film evaporator is 150° C., the pressure is 100 Pa, the scraped film speed is 100 rpm, the condenser temperature is 70° C., the cold well temperature is 0° C., and the intermediate product 1 is obtained after condensation;

[0043] Step 2: After the intermediate product 1 is heated and melted, it is subjected to vacuum distillation at a temperature of 200° C. and a pressure of 10 Pa to obtain a heavy phase component 1 and a light phase component 1, the light phase component 1 is discarded and the heavy phase component 1 is collected;

[0044] Step 3: subjecting the heavy phase component 1 to vacuum distillation at a temperature of 240° C. and a pressure of 5 Pa to obtain a heavy phase component 2 and a light phase component 2, discarding the light phase component 2 and collecting the heavy phase component 2;

[0045] Step 4: subject the heavy phase component 2 to vacuum distillation at a temperature of 290°C and a pressure of 5 Pa. When no bubbles are generated in the liquid phase, the distillation temperature is increased to 320°C to obtain a heavy phase component 3 and a light phase component 3. The heavy phase component 3 is discarded and the light phase component 3 is collected to obtain an intermediate product 2.

[0046] Step 5: catalytically hydrogenate the intermediate product 2 at a temperature of 250° C. and a pressure of 0.5 MPa using palladium carbon as the catalyst to obtain the intermediate product 3;

[0047] Step 6: Mix the coupling agent with the intermediate product 3 and stir evenly to obtain an asphalt warm mix agent, wherein the coupling agent is a titanate coupling agent 101 , and the mass of the titanate coupling agent 101 is 20% of the mass of the intermediate product 3 .

[0048] The Fischer-Tropsch wax in this embodiment is refined Fischer-Tropsch wax FR100 produced by Zhejiang Huangxing Chemical Co., Ltd.

[0049] Example 3

[0050] This embodiment provides a method for preparing an asphalt warm mix agent for acidic aggregate, comprising the following steps:

[0051] Step 1: After the Fischer-Tropsch wax is heated and melted, it is evaporated by a scraped film evaporator, the evaporation temperature of the scraped film evaporator is 180° C., the pressure is 200 Pa, the scraped film speed is 200 rpm, the condenser temperature is 75° C., the cold well temperature is 10° C., and the intermediate product 1 is obtained after condensation;

[0052] Step 2: After the intermediate product 1 is heated and melted, it is subjected to vacuum distillation at a temperature of 220° C. and a pressure of 25 Pa to obtain a heavy phase component 1 and a light phase component 1, the light phase component 1 is discarded and the heavy phase component 1 is collected;

[0053] Step 3: subjecting the heavy phase component 1 to vacuum distillation at a temperature of 280° C. and a pressure of 20 Pa to obtain a heavy phase component 2 and a light phase component 2, discarding the light phase component 2 and collecting the heavy phase component 2;

[0054] Step 4: subject the heavy phase component 2 to vacuum distillation at a temperature of 300°C and a pressure of 10Pa. When no bubbles are generated in the liquid phase, the distillation temperature is raised to 330°C to obtain a heavy phase component 3 and a light phase component 3. The heavy phase component 3 is discarded and the light phase component 3 is collected to obtain an intermediate product 2.

[0055] Step 5: catalytically hydrogenate the intermediate product 2 at a temperature of 300° C. and a pressure of 5 MPa using palladium carbon as the catalyst to obtain the intermediate product 3;

[0056] Step 6: Mix the coupling agent with the intermediate product 3 and stir evenly to obtain an asphalt warm mix agent, wherein the coupling agent is a titanate coupling agent 101 , and the mass of the titanate coupling agent 101 is 35% of the mass of the intermediate product 3 .

[0057] The Fischer-Tropsch wax in this embodiment is refined Fischer-Tropsch wax FR100 produced by Zhejiang Huangxing Chemical Co., Ltd.

[0058] Comparative Example 1

[0059] This comparative example provides a method for preparing an asphalt warm mix agent for acidic aggregate, comprising the following steps:

[0060] Step 1: After the Fischer-Tropsch wax is heated and melted, it is evaporated by a scraped film evaporator, the evaporation temperature of the scraped film evaporator is 180° C., the pressure is 200 Pa, the scraped film speed is 200 rpm, the condenser temperature is 75° C., the cold well temperature is 10° C., and the intermediate product 1 is obtained after condensation;

[0061] Step 2: After the intermediate product 1 is heated and melted, it is subjected to vacuum distillation at a temperature of 220° C. and a pressure of 25 Pa to obtain a heavy phase component 1 and a light phase component 1, the light phase component 1 is discarded and the heavy phase component 1 is collected;

[0062] Step 3: subjecting the heavy phase component 1 to vacuum distillation at a temperature of 240° C. and a pressure of 20 Pa to obtain a heavy phase component 2 and a light phase component 2, discarding the light phase component 2 and collecting the heavy phase component 2;

[0063] Step 4: subjecting the heavy phase component 2 to vacuum distillation at a vacuum distillation temperature of 330° C. and a pressure of 10 Pa to obtain a heavy phase component 3 and a light phase component 3, discarding the heavy phase component 3 and collecting the light phase component 3 to obtain an intermediate product 2;

[0064] Step 5: catalytically hydrogenate the intermediate product 2 at a temperature of 300° C. and a pressure of 5 MPa using palladium carbon as the catalyst to obtain the intermediate product 3;

[0065] Step 6: Mix the coupling agent with the intermediate product 3 and stir evenly to obtain an asphalt warm mix agent, wherein the coupling agent is a titanate coupling agent 101 , and the mass of the titanate coupling agent 101 is 35% of the mass of the intermediate product 3 .

[0066] The Fischer-Tropsch wax in this comparative example is refined Fischer-Tropsch wax FR100 produced by Zhejiang Huangxing Chemical Co., Ltd.

[0067] Comparative Example 2

[0068] This comparative example provides a method for preparing an asphalt warm mix agent for acidic aggregate, comprising the following steps:

[0069] Step 1: After the Fischer-Tropsch wax is heated and melted, it is evaporated by a scraped film evaporator, the evaporation temperature of the scraped film evaporator is 180° C., the pressure is 200 Pa, the scraped film speed is 200 rpm, the condenser temperature is 75° C., the cold well temperature is 10° C., and the intermediate product 1 is obtained after condensation;

[0070] Step 2: After the intermediate product 1 is heated and melted, it is subjected to vacuum distillation at a temperature of 220° C. and a pressure of 25 Pa to obtain a heavy phase component 1 and a light phase component 1, the light phase component 1 is discarded and the heavy phase component 1 is collected;

[0071] Step 3: subject the heavy phase component 1 to vacuum distillation at a temperature of 300° C. and a pressure of 10 Pa. When no bubbles are generated in the liquid phase, the distillation temperature is raised to 330° C. to obtain a heavy phase component 3 and a light phase component 3. The heavy phase component 3 is discarded and the light phase component 3 is collected to obtain an intermediate product 2.

[0072] Step 4: catalytically hydrogenate the intermediate product 2 at a temperature of 300° C. and a pressure of 5 MPa using palladium carbon as the catalyst to obtain the intermediate product 3;

[0073] Step 5: Mix the coupling agent with the intermediate product 3 and stir evenly to obtain an asphalt warm mix agent, wherein the coupling agent is a titanate coupling agent 101 , and the mass of the titanate coupling agent 101 is 35% of the mass of the intermediate product 3 .

[0074] The Fischer-Tropsch wax in this comparative example is refined Fischer-Tropsch wax FR100 produced by Zhejiang Huangxing Chemical Co., Ltd.

[0075] Application Example 1

[0076] Take four parts of equal mass from the same batch of asphalt, add the asphalt warm mix agent prepared in Example 3, the asphalt warm mix agent prepared in Comparative Example 1, and the asphalt warm mix agent prepared in Comparative Example 2 to three parts of the asphalt respectively, the asphalt warm mix agent added in an amount of 2% of the mass of the asphalt, and after stirring, obtain Asphalt 1, Asphalt 2 and Asphalt 3 respectively. The part without the addition of the warm mix agent is numbered asphalt 4.

[0077] The relevant performance data of asphalt 1-4 were measured according to the relevant measurement methods recorded in JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". The results are shown in the following table:

[0078]

[0079] Result analysis: By comparing the relevant properties of asphalts 1-4, it can be seen that the use of the asphalt warm mix agent provided by the present invention can significantly improve the water stability and dynamic stability of the road surface, achieving the intended purpose of the present invention.

[0080] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A method for preparing a warm mix asphalt agent for acidic aggregate, characterized in that: The following steps are involved: Step 1: After heating and melting the Fischer-Tropsch wax, the Fischer-Tropsch wax is evaporated by a wiped film evaporator, and the intermediate product 1 is obtained after condensation; Step 2: After heating and melting the intermediate product 1, performing reduced pressure distillation to obtain a heavy phase component 1 and a light phase component 1, discarding the light phase component 1 and collecting the heavy phase component 1; Step 3: distill the heavy phase component 1 under reduced pressure to obtain a heavy phase component 2 and a light phase component 2, discard the light phase component 2 and collect the heavy phase component 2; Step 4: subject the heavy phase component 2 to vacuum distillation until no bubbles are generated in the liquid phase, raise the distillation temperature to obtain a heavy phase component 3 and a light phase component 3, discard the heavy phase component 3 and collect the light phase component 3 to obtain an intermediate product 2; Step 5: performing a catalytic hydrogenation reaction on the intermediate product 2 to obtain the intermediate product 3; Step 6: Mix the coupling agent with the intermediate product 3, and stir evenly to obtain the asphalt warm mix agent.

2. The method for preparing a warm mix asphalt agent for acidic aggregate according to claim 1, characterized in that: The evaporation temperature of the scraping film evaporation in the step 1 is 150-200° C., the pressure is 100-500 Pa, and the scraping film rotation speed is 100-300 rpm.

3. The method for preparing a warm mix asphalt agent for acidic aggregate according to claim 2, characterized in that: In the step 1, the condenser temperature of the scraped film evaporator is 70-80°C, and the cold well temperature is 0-40°C.

4. The method for preparing a warm mix asphalt agent for acidic aggregate according to claim 1, characterized in that: The temperature of the reduced pressure distillation in step 2 is 200-240° C. and the pressure is 10-50 Pa.

5. The method for preparing a warm mix asphalt agent for acidic aggregate according to claim 1, characterized in that: The temperature of the reduced pressure distillation in step 3 is 240-290° C. and the pressure is 5-50 Pa.

6. The method for preparing a warm mix asphalt agent for acidic aggregate according to claim 1, characterized in that: The temperature of the reduced pressure distillation before heating in step 4 is 290-320° C. and the pressure is 5-50 Pa.

7. The method for preparing a warm mix asphalt agent for acidic aggregate according to claim 6, characterized in that: The temperature of the reduced pressure distillation after heating in step 4 is 320-350° C. and the pressure is 5-50 Pa.

8. The method for preparing a warm mix asphalt agent for acidic aggregate according to claim 1, characterized in that: The temperature of the catalytic hydrogenation in step 5 is 250-350° C., the pressure is 0.5-10 MPa, and the catalyst is palladium carbon.

9. The method for preparing a warm mix asphalt agent for acidic aggregate according to claim 1, characterized in that: The acid value of the intermediate product 3 is not greater than 5 mg KOH / g, and the pH value ranges from 7.5 to 9.

10. The method for preparing a warm mix asphalt agent for acidic aggregate according to claim 1, characterized in that: The coupling agent is a titanate coupling agent 101 , and the mass of the titanate coupling agent 101 is 20-50% of the mass of the intermediate product 3 .

Images