Preparation method and application of interfacial enhancer for enhancing interfacial interaction of asphalt aggregate

Abstract

The invention discloses a preparation method and application of an interface enhancer for enhancing asphalt aggregate interface interaction, and the preparation method comprises the following steps: (1) atomizing liquid methyl chlorosilane and acetylene, and blending in a reaction kettle W under high-temperature and high-pressure conditions to obtain a liquid organic mixture I; (2) introducing a gas catalyst into a reaction kettle W containing the organic mixture I; (3) simultaneously fractionating the organic mixture I in the reaction kettle W, and condensing the fraction in a collector S to obtain an organic mixture II; and (4) finally, adding an amine mixture into the organic mixture II, and stirring to obtain the interface reinforcing agent. The preparation method provided by the invention is simple to operate, test conditions are easy to control, a relatively excellent interface adhesion improving effect can be achieved by a small amount of the interface reinforcing agent, and compared with asphalt added with three common anti-stripping agents through a pull-out test, the adhesion effect of the asphalt is proved to be better than that of asphalt added with three common anti-stripping agents.

Description

Technical Field

[0001] The invention relates to the technical field of road construction materials, and in particular to a preparation method and application of an interface enhancer for enhancing the interface interaction of asphalt aggregates. Background Art

[0002] Asphalt is one of the commonly used materials in road engineering. Modified asphalt is improved by adding modifiers to improve the road performance of asphalt materials and asphalt mixtures. With the development of social economy, traffic volume continues to increase, and the proportion of heavy-loaded vehicles is showing an increasing trend, which has brought great challenges to the quality of the road surface. Many newly built asphalt pavements have serious bulging and breakage problems. The main reason is that the pavement material has poor tensile strength and insufficient high-temperature stability. Asphalt, as the most important component of pavement materials, plays a decisive role in the quality of the pavement. An ideal asphalt material should meet the following requirements: high stiffness at high temperature, low stiffness at low temperature, good anti-peeling effect in the presence of water, and strong tensile strength.

[0003] Therefore, the present invention provides an asphalt enhancer that can significantly improve the pull-out strength of asphalt, so that the asphalt to which the enhancer of the present invention is added can meet the road performance requirements and extend the service life of the road. Summary of the invention

[0004] In view of this, the present invention provides a method for preparing an interface enhancer for enhancing the interface interaction between asphalt aggregates.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A method for preparing an interface enhancer for enhancing the interface interaction between asphalt aggregates, characterized by comprising the following steps:

[0007] (1) firstly atomizing liquid methylchlorosilane and acetylene and then mixing them in a reactor W under high temperature and high pressure conditions to obtain a liquid organic mixture I;

[0008] (2) introducing a gas catalyst into a reaction vessel W containing the organic mixture I;

[0009] (3) At the same time, the organic mixture I in the reactor W is fractionated, and the fractions are condensed in a collector S to obtain an organic mixture II;

[0010] (4) Finally, the amine mixture is added to the organic mixture II and stirred to obtain an interface enhancer.

[0011] Preferably, in step (1), the concentration of liquid methyldichlorosilane is 0.9 mol / L, and the mass ratio of methyldichlorosilane to acetylene is 1:0.5-1.0.

[0012] Preferably, in step (1), the reaction conditions of the high temperature and high pressure reactor W are: temperature 80° C., pressure 1.5 kPa.

[0013] Preferably, in step (2), the gas catalyst is nitrogen and the gas flow rate is 50 L / h.

[0014] Preferably, in the step (3), the distillation temperature for fractionating the organic mixture I in the reactor W is 120°C.

[0015] Preferably, in step (4), the amine is a mixture of 2-hydroxyethylamine and dibutylamine, and the mass fraction ratio is 1:1; the mass fraction ratio of the amine mixture to the organic mixture II is 0.5:1.

[0016] The invention discloses an application of an interface enhancer obtained by a method for preparing an interface enhancer for enhancing the interface interaction between asphalt and aggregate, characterized in that the interface enhancer obtained is used after being fully stirred with asphalt, and the addition amount of the interface enhancer obtained in the asphalt is 0.2% to 0.6%.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] (1) The preparation method of the present invention is simple to operate and the experimental conditions are easy to control.

[0019] (2) The interface enhancer prepared by the present invention can achieve a relatively excellent interface adhesion improvement effect when used in a small amount in asphalt;

[0020] (3) After the interface enhancer prepared by the present invention is fully mixed with asphalt, a pull-out test is performed to compare the adhesion effect of the asphalt with three common anti-stripping agents added. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a flow chart of a method for preparing and applying an interface enhancer for enhancing the interface interaction between asphalt aggregates.

[0022] Figure 2 The present invention is a simplified schematic diagram of the preparation method of an interface enhancer for enhancing the interface interaction between asphalt aggregates and the application of the interface enhancer. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Embodiment 1:

[0025] A method for preparing an interface enhancer for enhancing asphalt aggregate interface interaction comprises the following steps:

[0026] (1) firstly atomizing liquid methylchlorosilane and acetylene and then mixing them in a reactor W at a temperature of 60° C. and a pressure of 0.5 kPa to obtain a liquid organic mixture I;

[0027] (2) introducing a gas catalyst into a reaction vessel W containing the organic mixture I;

[0028] (3) At the same time, the organic mixture I in the reactor W is fractionated and heated to 90° C. The fractionation pipe G2 and the ventilation pipe G1 are opened, and nitrogen is injected from the ventilation pipe G1. The fraction is condensed in the collector S to obtain an organic mixture II. When the mass of the collector S no longer increases, the organic mixture II in the collector S is transferred to a container;

[0029] (4) Finally, add 0.1 times the mass fraction of the amine mixture into the organic mixture II, and stir to obtain an interface enhancer.

[0030] Embodiment 2:

[0031] A method for preparing an interface enhancer for enhancing asphalt aggregate interface interaction comprises the following steps:

[0032] (1) firstly atomizing liquid methylchlorosilane and acetylene and then mixing them in a reaction kettle W at a temperature of 70° C. and a pressure of 1 kPa to obtain a liquid organic mixture I;

[0033] (2) introducing a gas catalyst into a reaction vessel W containing the organic mixture I;

[0034] (3) At the same time, the organic mixture I in the reactor W is fractionated and heated to 100° C. The fractionation pipeline G2 and the ventilation pipeline G1 are opened, and nitrogen is injected from the ventilation pipeline G1. The fraction is condensed in the collector S to obtain an organic mixture II. When the mass of the collector S no longer increases, the organic mixture II in the collector S is transferred to a container;

[0035] (4) Finally, add 0.2 times the mass fraction of the amine mixture into the organic mixture II, and stir to obtain an interface enhancer.

[0036] Embodiment 3:

[0037] A method for preparing an interface enhancer for enhancing asphalt aggregate interface interaction comprises the following steps:

[0038] (1) firstly atomizing liquid methylchlorosilane and acetylene and then mixing them in a reactor W at a temperature of 80° C. and a pressure of 1.5 kPa to obtain a liquid organic mixture I;

[0039] (2) introducing a gas catalyst into a reaction vessel W containing the organic mixture I;

[0040] (3) At the same time, the organic mixture I in the reactor W is fractionated and heated to 120° C. The fractionation pipeline G2 and the ventilation pipeline G1 are opened, and nitrogen is injected from the ventilation pipeline G1. The fraction is condensed in the collector S to obtain an organic mixture II. When the mass of the collector S no longer increases, the organic mixture II in the collector S is transferred to a container;

[0041] (4) Finally, add 0.5 times the mass fraction of the amine mixture into the organic mixture II, and stir to obtain an interface enhancer.

[0042] Embodiment 4:

[0043] A method for preparing an interface enhancer for enhancing asphalt aggregate interface interaction comprises the following steps:

[0044] (1) firstly atomizing liquid methylchlorosilane and acetylene and then mixing them in a reactor W at a temperature of 90° C. and a pressure of 2 kPa to obtain a liquid organic mixture I;

[0045] (2) introducing a gas catalyst into a reaction vessel W containing the organic mixture I;

[0046] (3) At the same time, the organic mixture I in the reactor W is fractionated and heated to 130° C. The fractionation pipeline G2 and the ventilation pipeline G1 are opened, and nitrogen is injected from the ventilation pipeline G1. The fraction is condensed in the collector S to obtain an organic mixture II. When the mass of the collector S no longer increases, the organic mixture II in the collector S is transferred to a container;

[0047] (4) Finally, add 1 times the mass fraction of the amine mixture into the organic mixture II, and stir to obtain the interface enhancer.

[0048] Embodiment 5:

[0049] A method for preparing an interface enhancer for enhancing asphalt aggregate interface interaction comprises the following steps:

[0050] (1) firstly atomizing liquid methylchlorosilane and acetylene and then mixing them in a reactor W at a temperature of 100° C. and a pressure of 3 kPa to obtain a liquid organic mixture I;

[0051] (2) introducing a gas catalyst into a reaction vessel W containing the organic mixture I;

[0052] (3) At the same time, the organic mixture I in the reactor W is fractionated and heated to 140° C. The fractionation pipeline G2 and the ventilation pipeline G1 are opened, and nitrogen is injected from the ventilation pipeline G1. The fraction is condensed in the collector S to obtain an organic mixture II. When the mass of the collector S no longer increases, the organic mixture II in the collector S is transferred to a container;

[0053] (4) Finally, add 1 times the mass fraction of the amine mixture into the organic mixture II, and stir to obtain the interface enhancer.

[0054] The method for the pull-out test of the present invention is as follows: first, the aggregate, asphalt, and the pulling head are placed in an oven at 170°C and heated for 1 hour; when the asphalt is in a flowing state, the hot asphalt weighed in advance is dripped onto the pulling head, and the pulling head with asphalt is gently pressed on the aggregate surface without waiting for cooling; then, the whole sample is directly placed in 40°C water and left to stand for 48 hours after cooling to room temperature. Finally, the pull-out test is performed using a Positest AT-A instrument; the loading rate is set to 0.7MPa / s.

[0055] The tensile strength test results of asphalt added with the reinforcing agent obtained under the conditions of the above different embodiments are obtained through the above embodiments 1-5, as shown in Table 1:

[0056] Table 1:

[0057]

[0058] The pull-out strength test results of asphalt with different materials added were obtained through the above Examples 1-5, as shown in Table 2:

[0059] Table 2:

[0060]

[0061] It can be seen from Table 1 that the interface enhancer obtained under the conditions of the present invention has the best pull-out strength; and it can be seen from Table 2 that the interface enhancer of the present invention has the best pull-out strength.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing an interface enhancer for enhancing the interface interaction between asphalt aggregates, characterized in that: The following steps are involved: (1) firstly atomizing liquid methylchlorosilane and acetylene and then mixing them in a reactor W under high temperature and high pressure conditions to obtain a liquid organic mixture I; (2) introducing a gas catalyst into a reaction vessel W containing the organic mixture I; (3) At the same time, the organic mixture I in the reactor W is fractionated, and the fractions are condensed in a collector S to obtain an organic mixture II; (4) Finally, the amine mixture is added to the organic mixture II and stirred to obtain an interface enhancer.

2. The method for preparing an interface enhancer for enhancing the asphalt aggregate interface interaction according to claim 1, characterized in that: In the step (1), the concentration of liquid methyldichlorosilane is 0.9 mol / L, and the mass ratio of methyldichlorosilane to acetylene is 1:0.5-1.

0.

3. The method for preparing an interface enhancer for enhancing the asphalt aggregate interface interaction according to claim 1, characterized in that: In the step (1), the reaction conditions of the high temperature and high pressure reactor W are: temperature 80° C., pressure 1.5 kPa.

4. The method for preparing an interface enhancer for enhancing the asphalt aggregate interface interaction according to claim 1, characterized in that: In the step (2), the gas catalyst is nitrogen, and the gas flow rate is 50 L / h.

5. The method for preparing an interface enhancer for enhancing the interface interaction between asphalt and aggregate according to claim 1, characterized in that: In the step (3), the distillation temperature for fractionating the organic mixture I in the reactor W is 120°C.

6. The method for preparing an interface enhancer for enhancing the interface interaction between asphalt and aggregate according to claim 1, characterized in that: In the step (4), the amine is a mixture of 2-hydroxyethylamine and dibutylamine, and the mass fraction ratio is 1:1; the mass fraction ratio of the amine mixture to the organic mixture II is 0.5:

1.

7. Use of the interface enhancer obtained by the preparation method of the interface enhancer for enhancing the interface interaction between asphalt and aggregate according to claims 1-6, characterized in that: The obtained interface enhancer is fully mixed with asphalt before use, and the added amount of the obtained interface enhancer in asphalt is 0.2% to 0.6%.

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