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Granular dry modifier for asphalt and preparation method thereof

A granular, modifier technology, applied in building components, building insulation materials, buildings, etc., can solve the problems of negative impact on road performance of mixtures, limit the application of dry modification technology, and adversely affect the performance of matrix asphalt. The effect of improving construction flexibility, preventing powder from floating, and eliminating safety hazards

Inactive Publication Date: 2020-05-12
BEIJING ZHONGLU PAVING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can prepare a dry method modifier with a large amount of SBS modifier, there is a serious defect: only the SBS modifier that exists in the state of extremely small particles (particle diameter tens of microns) can affect the performance of asphalt. Modification, even after mixing and granulation in Method 1, the SBS particles with large particle size cannot be crushed into small particles in the short mixing process, and the SBS with large particle size is difficult to exert its effect on the base asphalt added to the mixing plant. With modification effect, compared with the conventional wet method, the road performance is at a lower level
Compared with method 1, method 2 can pre-shear larger SBS particles into small particles, which is helpful to improve the performance of matrix asphalt, but there are still shortcomings: first, due to high-speed shearing, it must be in a liquid state However, SBS exists in a solid state at the processing temperature. In order to facilitate the shearing process, a large proportion of liquid additives such as oleic acid must be added, resulting in a maximum effective SBS ratio of 20% in the dry modifier. Excessively high additives The ratio of the agent not only affects the efficiency, but also has a negative impact on the road performance of the mixture; secondly, with the addition of the stabilizer at high temperature, the SBS crosslinking reaction has already occurred during the preparation of the modifier. At the same time, the three-dimensional network structure formed by cross-linking will be destroyed under the embedding pressure of stone materials, which will not be conducive to the improvement of the performance of matrix asphalt
[0007] It can be seen that there are serious technical defects in the existing two dry method modifier preparation methods. Compared with the wet method, although the construction flexibility is improved, it is difficult to achieve similar road performance, which limits the dry method. Application of law modification technology

Method used

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  • Granular dry modifier for asphalt and preparation method thereof
  • Granular dry modifier for asphalt and preparation method thereof
  • Granular dry modifier for asphalt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] After crushing the dry SBS particles into a powder with a particle size of 500 μm by using a high-speed mechanical impact mill at room temperature, add talcum powder to the SBS powder to form a mixture, wherein the weight ratio of SBS particles to talcum powder is 60 : 0.5;

[0047] Then put the mixture into a flat-die extruder with a cutting length of 15mm for cold granulation, cool down with cold water to make the temperature not higher than 80°C, and then further cool to room temperature. Mixtures with broken granules can be refluxed to regranulate.

[0048] The SBS used in the present invention can also be linear or star-shaped SBS of any one or two or more product types on the market, such as star-shaped 4301, linear 1301, linear LG501S, linear LG441, YH4303, etc.

[0049] It should be noted that the pulverized particle size of the SBS can be less than any value below 2000 μm, such as 1900, 1800, 1700, 1600, 1400, 13000, 1200, 1100, 1000, 900, 800, 700, 600, 400, ...

Embodiment 2

[0055] Add 0.1 parts by weight of CeO in addition to pulverizing the SBS particles 2 For abrasives with a content greater than 40%, a ring die extruder is used when the modifier is granulated, and the others are the same as in Example 1.

[0056] It should be noted that the technical purpose of the present invention can be realized within the scope of 0.05-0.1% of the weight of the SBS particles in the addition of the grinding agent, and the present invention uses CeO 2 The abrasive with a content greater than 40% uses its unique angular structure to repeatedly impact the SBS particles in the crushing process at high speed, further reducing the particle size and improving the crushing efficiency.

[0057] Of course, those skilled in the art can improve the pulverization efficiency of SBS particles in a more effective way.

[0058] The following examples are granular instant SBS modifiers prepared by using co-solvent or cross-linking main agent and cross-linking auxiliary agen...

Embodiment 3

[0060] 1. Crushing treatment

[0061] At room temperature, 80 parts of SBS particles in a dry state were pulverized into powders with a particle size of 100 μm using a stirring ball mill, during which CeO 2 The proportion is 0.1 parts by weight of SBS particles.

[0062] 2. Preparation of basic materials

[0063] Add 20 parts of solubilizing oil to the pulverized SBS powder, and stir evenly to obtain the base material.

[0064] 3. Granulation

[0065] Add the basic material obtained in step 2 into a flat-die extruder with a cutting length of 15mm for cold granulation, and then use water cooling to cool down in time so that the temperature during the granulation process is lower than or higher than 80°C. Finally, air cooling is used to further cool the modifier particles to room temperature to obtain a dry modifier, and the powder with damaged particles is refluxed for regranulation.

[0066] It should be noted that any value within the range of 20-30 parts of the solubiliz...

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Abstract

The invention discloses a granular instant dry SBS modifier for an asphalt pavement and a preparation method and application thereof, belonging to the field of road engineering materials. The main component of the granular instant dry SBS modifier is powdery SBS, and a separant, hydrotropic oil, a main cross-linking agent and an auxiliary cross-linking agent can be selectively added. The preparation method comprises the following steps: crushing SBS particles; then adding the separant, the hydrotropic oil, the main cross-linking agent and the auxiliary cross-linking agent into the obtained SBSpowder; and then carrying out cold granulation at a temperature of not higher than 80 DEG C in a flat die or circular die extruder with a cutting length of 10-30 mm so as to obtain the granular dry modifier. The granular dry modifier for asphalt prepared in the invention inherits the advantages of a dry-method process and a wet-method process, and can effectively improve the construction qualityof a pavement while enhance construction flexibility; and in addition, the problems of floating and dust flammability caused by only using micron-sized SBS powder are solved by adopting a prepared cold granulation mode.

Description

technical field [0001] The invention belongs to the technical field of highway engineering materials, and in particular relates to a cold granulation asphalt dry method modifier and a preparation method thereof. Background technique [0002] With the improvement of people's requirements for road construction quality, SBS modified asphalt has become one of the necessary building materials for high-grade road construction because of its excellent high and low temperature performance. According to different methods of use, the use of SBS modified asphalt can be divided into wet process and dry process. The former needs to be prepared in the modified asphalt factory with base asphalt and SBS modifier as raw materials through grinding to obtain finished SBS modified. The asphalt is then transported to the mixing station for mixing with stone materials; the latter directly mixes the dry-process SBS modifier, stone materials, and base asphalt at the mixing station, omitting the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L53/02C08L91/00C08K3/34C08K3/22C08K13/02
CPCC08L95/00C08K2003/2213
Inventor 唐国奇
Owner BEIJING ZHONGLU PAVING TECH
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