Compound modified asphalt rubber powder formula and preparation method thereof

Abstract

The invention provides a composite modified asphalt rubber powder formula and a preparation method thereof, and relates to the technical field of asphalt materials. The composite modified asphalt rubber powder formula specifically comprises the following material components in parts by mass: 80-100 parts of matrix asphalt, 20-25 parts of waste tire powder, 10-15 parts of mixed oil, 1-5 parts of an additive, 10-12 parts of an auxiliary material and a proper amount of water, the matrix asphalt is at least one of rock asphalt, lake asphalt and submarine asphalt; the waste tire powder is prepared from rubber powder obtained by crushing small blocks of pure waste tire rubber from which steel wire fibers are stripped, and the particle size of the waste tire powder is 30-40 meshes. In the whole production preparation and mixture mixing process, extra equipment, equipment transformation and adjustment of a special processing preparation process are not needed, and the preparation production can be quickly realized only by adding a mixing and adding procedure of multiple raw materials in the mixing process.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt materials, in particular to a composite modified asphalt rubber powder formula and a preparation method thereof. Background Art

[0002] With the continuous development of transportation, the performance requirements for road materials are getting higher and higher. Rubber asphalt has been widely used in road projects, but the current rubber asphalt is mainly made by mixing tire powder with 70 and 90 petroleum asphalt. The main advantage is that it has excellent low-temperature performance and solves the problem of waste tire disposal.

[0003] Traditional asphalt materials have some shortcomings during use, such as poor high-temperature stability and insufficient low-temperature crack resistance. In order to improve the performance of asphalt materials, researchers began to explore various modification methods. As a kind of solid waste, the recycling of waste rubber has always been an important topic in the field of environmental protection. Compounding waste rubber powder with modified emulsified asphalt can give full play to the advantages of both, improve the performance of asphalt materials, and realize the resource utilization of waste rubber. Rubber modified asphalt in the prior art is generally obtained by directly mixing tire rubber powder with asphalt or high-speed shearing and then heat-insulating it. This results in poor dispersion performance between various materials in the production process of rubber asphalt, resulting in a significant increase in the viscosity of the modified asphalt, and poor construction and workability, which seriously affects the road use and performance of rubber asphalt and the construction quality. Summary of the invention

[0004] (I) Technical solution

[0005] The present invention is achieved through the following technical scheme: a composite modified asphalt rubber powder formula, specifically comprising the following material mass ratio components: 80-100 parts of base asphalt, 20-25 parts of waste tire powder, 10-15 parts of mixed oil, 1-5 parts of admixture, 10-12 parts of auxiliary materials and appropriate amount of water.

[0006] Preferably, the matrix asphalt is at least one of rock asphalt, lake asphalt and seabed asphalt.

[0007] Preferably, the waste tire powder is prepared by crushing small pieces of pure waste tire rubber from which steel wire fibers have been stripped, wherein the particle size of the waste tire powder is 30-40 meshes.

[0008] Preferably, the mixed oil is a mixture of kitchen waste oil and domestic waste oil, wherein the kitchen waste oil includes waste cooking oil and discarded animals and plants, and the domestic waste oil includes gutter oil and ground oil-water mixture, and the mixed oil is also used as a plasticizer.

[0009] Preferably, the admixture includes a stabilizer, a thickener and an initiator, the stabilizer is an antioxidant of tert-butylhydroquinone, the thickener is a natural thickener xanthan gum, and the initiator is diisooctanoic acid peroxide in an organic peroxide.

[0010] Preferably, the auxiliary material is powdered plastic powder obtained by grinding crushed particles of waste plastic products.

[0011] Preferably, a method for preparing a composite modified asphalt rubber powder formula specifically comprises the following steps:

[0012] S1. Weigh the raw material matrix asphalt, waste tire powder, mixed oil, admixture, auxiliary materials and appropriate amount of water by weight;

[0013] S2. The waste tire powder is placed in a stirred reactor for heating and stirring, and a small amount of mixed oil and sufficient auxiliary materials are added successively, and the mixture is heated and stirred continuously to obtain a plastic mixture, which is kept warm for standby use;

[0014] S3. After heating the lake asphalt to 190-200℃, place it in a stirring reactor, gradually add the heat-insulating rubber-plastic mixture and stir until it is saturated and uniform, then add sufficient mixed oil, admixture and appropriate amount of water in turn. After stirring at high speed for a period of time, reduce the speed and continue stirring for 2.5 hours, then pour it into a cooling mold to cool, and finally crush and grind the cooled mixture to obtain the composite modified asphalt rubber powder.

[0015] (II) Beneficial effects

[0016] The present invention provides a composite modified asphalt rubber powder formula and a preparation method thereof. It has the following beneficial effects:

[0017] The present invention provides a formula of a composite modified asphalt rubber powder and a preparation method thereof. In the entire production preparation and mixed material mixing process, there is no need to add redundant equipment, equipment modification and adjustment of special processing and preparation technology. Only a mixing and adding procedure of multiple raw materials in the mixing process is required to quickly realize the preparation and production. By applying waste rubber powder to the modification of emulsified asphalt, not only the resource recycling is realized and the cost is reduced, but also the fatigue resistance and aging resistance of the emulsified asphalt can be effectively improved, and the durability of the road surface can be enhanced. Moreover, admixtures such as stabilizers, thickeners and the like are used to optimize the production process and performance of the modified emulsified asphalt, and ensure its stability and reliability during storage, transportation and construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the preparation process framework of the present invention. DETAILED DESCRIPTION

[0019] 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.

[0020] Embodiment 1:

[0021] The embodiment of the present invention provides a formula of composite modified asphalt rubber powder, which specifically includes the following materials in mass ratio: 80 parts of base asphalt, 20 parts of waste tire powder, 10 parts of mixed oil, 5 parts of admixture, 10 parts of auxiliary materials and appropriate amount of water.

[0022] Specifically, the matrix asphalt is at least one of rock asphalt, lake asphalt and seabed asphalt; the waste tire powder is made from the rubber powder obtained by crushing small pieces of pure waste tire rubber stripped of steel wire fibers, wherein the particle size of the waste tire powder is 30-40 meshes; the mixed oil is a mixture of kitchen waste oil and domestic waste oil, wherein the kitchen waste oil includes kitchen waste oil and discarded animals and plants, and the domestic waste oil includes gutter oil and ground oil-water mixture, and the mixed oil is also used as a plasticizer; the admixture includes a stabilizer, a thickener and an initiator, wherein the stabilizer is an antioxidant of tert-butylhydroquinone, the thickener uses natural thickener xanthan gum, and the initiator uses diethylhexanoic acid peroxide in organic peroxide; the auxiliary material uses powdered plastic powder obtained by grinding crushed particles of waste plastic products;

[0023] The preparation method of the composite modified asphalt rubber powder formula based on the above material components specifically comprises the following steps:

[0024] S1. Weigh 80 parts of base asphalt, 20 parts of waste tire powder, 10 parts of mixed oil, 5 parts of admixture, 10 parts of auxiliary materials and appropriate amount of water for standby;

[0025] Collect waste tires and ensure that there are no obvious pollutants on the tire surface. Use a tire shearing machine to cut the tires into small pieces, usually a few centimeters square structure, for subsequent processing. Then use mechanical means to peel off the steel wire and fiber of the tire to obtain relatively pure rubber particles. Put the cut rubber blocks into a crusher for further crushing until the rubber powder of the required particle size is obtained. Then use a screening device with a particle size of 30-40 mesh to screen the crushed product to remove particles that do not meet the particle size requirements to ensure the consistency of the final product; the powder particles obtained from some waste tires with pollutants on the surface can be washed to remove residual impurities, and then remove moisture in a drying device to obtain dry rubber powder;

[0026] S2. Put 20 parts of waste tire powder into a stirred reactor for heating and stirring, start the stirred reactor, heat to a set temperature between 140°C and 180°C, add 3 parts of mixed oil and 10 parts of auxiliary materials in sequence, and continue heating and stirring for a certain time after adding the mixed oil and auxiliary materials, for 15 to 30 minutes to ensure that all ingredients are completely fused to form a uniform plastic mixture, continue heating and stirring to mix, and obtain a plastic mixture, which is kept warm for later use;

[0027] Plastic powder and rubber powder are heated and mixed with mixed oil to produce a plastic-rubber composite material with excellent mechanical properties and wear resistance. The mixed oil can be used as a lubricant to reduce friction between materials, make the mixing more uniform, and reduce processing temperature to improve processing efficiency.

[0028] S3. After heating 80 parts of lake asphalt to 190-200°C, place it in a stirred reactor, gradually add the heat-insulated rubber-plastic mixture and stir until saturated and uniform, then add 7 parts of mixed oil, 5 parts of admixture and appropriate amount of water in turn, stir at high speed for a period of time, reduce the speed and continue stirring for 2.5 hours, then pour it into a cooling mold to cool, and finally grind the cooled mixture to obtain a composite modified asphalt rubber powder;

[0029] Among them, the stabilizer tert-butylhydroquinone in the admixture can prevent asphalt from degradation due to oxidation during storage and use; the natural thickener xanthan gum can improve the rheological properties and thickness of asphalt and help suspend rubber powder; the diethylhexanoic acid peroxide in the organic peroxide decomposes under high temperature conditions to produce free radicals, promote the cross-linking reaction between rubber and asphalt, and improve its mechanical properties.

[0030] Embodiment 2:

[0031] A composite modified asphalt rubber powder formula specifically includes the following materials by mass ratio: 75 parts of base asphalt, 19 parts of waste tire powder, 9 parts of mixed oil, 5 parts of admixture, 10 parts of auxiliary materials and appropriate amount of water;

[0032] The preparation method of the composite modified asphalt rubber powder formula based on the above material components specifically comprises the following steps:

[0033] S1. Weigh 75 parts of base asphalt, 19 parts of waste tire powder, 9 parts of mixed oil, 5 parts of admixture, 10 parts of auxiliary materials and appropriate amount of water for standby;

[0034] S2. 19 parts of waste tire powder are placed in a stirred reactor for heating and stirring, the stirred reactor is turned on, and heated to a set temperature between 140°C and 180°C, and 3 parts of mixed oil and 10 parts of auxiliary materials are added in sequence. After the addition of the mixed oil and auxiliary materials, heating and stirring are continued for a certain time, which lasts for 15 to 30 minutes to ensure that all ingredients are completely fused to form a uniform plastic-rubber mixture. After continuous heating and stirring, a plastic-rubber mixture is obtained, which is kept warm for later use;

[0035] S3. After heating 75 parts of lake asphalt to 180°C, place it in a stirring reactor, gradually add the heat-insulated rubber-plastic mixture and stir until it is saturated and uniform, then add 6 parts of mixed oil, 5 parts of admixture and appropriate amount of water in turn. After stirring at high speed for a period of time, reduce the speed and continue stirring for 2 hours, then pour it into a cooling mold to cool, and finally crush and grind the cooled mixture to obtain a composite modified asphalt rubber powder.

[0036] Embodiment three:

[0037] A composite modified asphalt rubber powder formula specifically includes the following materials by weight ratio: 80 parts of base asphalt, 21 parts of waste tire powder, 11 parts of mixed oil, 5 parts of admixture, 10 parts of auxiliary materials and appropriate amount of water;

[0038] The preparation method of the composite modified asphalt rubber powder formula based on the above material components specifically comprises the following steps:

[0039] S1. Weigh 80 parts of base asphalt, 21 parts of waste tire powder, 11 parts of mixed oil, 5 parts of admixture, 10 parts of auxiliary materials and appropriate amount of water by weight;

[0040] S2. Put 21 parts of waste tire powder into a stirred reactor for heating and stirring, start the stirred reactor, heat to a set temperature between 140°C and 180°C, add 3 parts of mixed oil and 11 parts of auxiliary materials in sequence, and continue heating and stirring for a certain time after adding the mixed oil and auxiliary materials, for 15 to 30 minutes to ensure that all ingredients are completely fused to form a uniform plastic-rubber mixture, continue heating and stirring to mix, and obtain a plastic-rubber mixture, which is kept warm for later use;

[0041] S3. After heating 80 parts of lake asphalt to 180°C, place it in a stirring reactor, gradually add the heat-insulated rubber-plastic mixture and stir until it is saturated and uniform, then add 8 parts of mixed oil, 5 parts of admixture and appropriate amount of water in turn. After stirring at high speed for a period of time, reduce the speed and continue stirring for 2 hours, then pour it into a cooling mold to cool, and finally crush and grind the cooled mixture to obtain a composite modified asphalt rubber powder.

[0042] Table 1

[0043]

[0044] Table 1 Result prediction table

[0045] It can be seen from the above embodiments that the present invention provides a composite modified asphalt rubber powder formula and a preparation method thereof. It can be seen from the application examples of the present invention that the composite modified asphalt rubber powder prepared by the present invention can meet other performance requirements of asphalt in road engineering, the preparation method is simple, the raw material source is wide, and it is convenient to use.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite modified asphalt rubber powder formula, characterized in that: Specifically, the material composition includes the following mass ratios: 80-100 parts of base asphalt, 20-25 parts of waste tire powder, 10-15 parts of mixed oil, 1-5 parts of admixture, 10-12 parts of auxiliary materials and appropriate amount of water.

2. A composite modified asphalt rubber powder formula according to claim 1, characterized in that: The matrix asphalt is at least one of rock asphalt, lake asphalt and seabed asphalt.

3. A composite modified asphalt rubber powder formula according to claim 1, characterized in that: The waste tire powder is prepared by crushing small pieces of pure waste tire rubber stripped of steel wire fibers into rubber powder, wherein the particle size of the waste tire powder is 30-40 meshes.

4. The composite modified asphalt rubber powder formula according to claim 1, characterized in that: The mixed oil is a mixture of kitchen waste oil and domestic waste oil, wherein the kitchen waste oil includes waste cooking oil and discarded animals and plants, and the domestic waste oil includes gutter oil and ground oil-water mixture. The mixed oil is also used as a plasticizer.

5. The composite modified asphalt rubber powder formula according to claim 1, characterized in that: The external admixture comprises a stabilizer, a thickener and an initiator. The stabilizer is an antioxidant of tert-butyl hydroquinone, the thickener adopts a natural thickener xanthan gum, and the initiator adopts diisooctanoic acid peroxide in an organic peroxide.

6. The composite modified asphalt rubber powder formula according to claim 1, characterized in that: The auxiliary material is powdered plastic powder obtained by grinding crushed particles of waste plastic products.

7. A method for preparing a composite modified asphalt rubber powder formula, characterized in that: The specific steps include: S1. Weigh the raw material matrix asphalt, waste tire powder, mixed oil, admixture, auxiliary materials and appropriate amount of water by weight; S2. The waste tire powder is placed in a stirred reactor for heating and stirring, and a small amount of mixed oil and sufficient auxiliary materials are added successively, and the mixture is heated and stirred continuously to obtain a plastic mixture, which is kept warm for standby use; S3. After heating the lake asphalt to 190-200℃, place it in a stirring reactor, gradually add the heat-insulating rubber-plastic mixture and stir until it is saturated and uniform, then add sufficient mixed oil, admixture and appropriate amount of water in turn. After stirring at high speed for a period of time, reduce the speed and continue stirring for 2.5 hours, then pour it into a cooling mold to cool, and finally crush and grind the cooled mixture to obtain the composite modified asphalt rubber powder.

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