SBS modified asphalt auxiliary agent and SBS modified asphalt

Abstract

The invention relates to the technical field of asphalt materials, in particular to an SBS modified asphalt additive and SBS modified asphalt. The asphalt additive comprises a slow-release shell and a filler filled in the slow-release shell, wherein the slow-release shell is a polyhedron, and release holes are formed in the central position of a single surface of the slow-release shell. The slow-release shell comprises polysulfone, a solvent and a hydrophilic agent; wherein the ratio of polysulfone to the solvent to the hydrophilic agent is 1.5: 8.5: 1; the filler comprises the following components in parts by weight: 45-50 parts of sulfur, 5-10 parts of calcium carbonate, 10-15 parts of lime and 5-10 parts of a plasticizer; after the slow-release shell is filled with the filler, a tackifier is sprayed on the surface of the slow-release shell. According to the invention, the slow-release shell is filled with a substance which plays an effective role as a filler, so that the release speed of the filler is slowed down, the filler can still play a part of role after the SBS modifier particles and the matrix asphalt are fully mixed, the action period of an auxiliary agent is prolonged, and the effect of playing a small amount of role after one-time addition and multiple times is realized.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt materials, and in particular to an SBS modified asphalt additive and SBS modified asphalt. Background Art

[0002] SBS modified asphalt is made of base asphalt as raw material, a certain proportion of SBS modifier is added, and then SBS is evenly dispersed in the asphalt through shearing, stirring and other methods to achieve the effect of enhancing the performance of asphalt. However, because SBS is a non-polar substance, after adding a base asphalt containing a large amount of polar substances, the two will be separated as the storage time increases. In the prior art, additives are added to the modified asphalt to reduce the interfacial energy between the two, thereby increasing the adhesion between the two. However, traditional additives are usually added as separate additives into the mixing tank of the two for sufficient stirring. Not only is the dosage difficult to control, but the base asphalt has poor fluidity, which makes it unable to fully work. Therefore, an SBS modified asphalt additive and SBS modified asphalt are needed. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide an SBS modified asphalt additive and SBS modified asphalt, which have the advantages of promoting the adhesion between the SBS modifier and the base asphalt, strong pertinence and long action period.

[0004] In the first aspect, the present invention provides an SBS modified asphalt additive, comprising a slow-release shell and a filler filled in the slow-release shell, wherein the slow-release shell is a polyhedron and a release hole is provided at the center of a single face thereof. The slow-release shell components include polysulfone, solvent, and hydrophilic agent; wherein the ratio of polysulfone, solvent, and hydrophilic agent is 1.5:8.5:1; the components of the filler include: 45-50 parts of sulfur, 5-10 parts of calcium carbonate, 10-15 parts of lime, and 5-10 parts of plasticizer; after the slow-release shell is filled with the filler, a tackifier is sprayed on its surface.

[0005] Furthermore, the filler is extruded to form a polyhedron whose particle size is no larger than the release hole, and a single sustained-release shell is filled with a plurality of fillers.

[0006] Furthermore, the solvent is any one of dimethylformamide, dimethylacetamide, N-methyl-2-pyrrolidone, and dimethyl sulfoxide.

[0007] Furthermore, the hydrophilic agent is any one of polyvinyl pyrrolidone, lithium chloride and polyethylene glycol.

[0008] Furthermore, the tackifier is polyvinyl acetate.

[0009] In a second aspect, the present invention provides an SBS modified asphalt, comprising the modified asphalt additive described above, and also comprising base asphalt, SBS modifier particles and microcrystalline wax.

[0010] Further, the production steps of SBS modified asphalt are as follows: S1: After spraying the tackifier on the surface of the modified asphalt additive, put it into the mixer and mix it with the SBS modifier particles. During the mixing process, cold air is blown into the mixer until a single modified asphalt additive adheres to at least one SBS modifier particle. S2: preheating the base asphalt and adding microcrystalline wax into the base asphalt to obtain a pretreated base asphalt; S3: The pretreated base asphalt, SBS modifier particles and modified asphalt additives are mixed, heated, sheared, ground and developed to obtain a finished SBS modified asphalt.

[0011] By adopting the above technical solution, the beneficial effects of the present invention are: The present invention fills the effective substance as a filler in the slow-release shell, slows down the release rate of the filler, ensures that the filler can still play a role after the SBS modifier particles are fully mixed with the matrix asphalt, prolongs the action cycle of the additive, and achieves the effect of adding a small amount of the additive multiple times. By setting a polysulfone material as the slow-release shell, the filler cannot be completely released by utilizing its high swelling rate and easy corrosion by aromatic hydrocarbons, and then spraying a tackifier on the surface of the asphalt additive, so that the asphalt additive is first adhered to the SBS modifier particles before mixing to achieve directional and fixed-point release, and the action is more targeted.

[0012] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

[0013] Undoubtedly, these and other objects of the present invention will become more apparent after the following detailed description of the preferred embodiment described with reference to various figures and drawings.

[0014] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, one or several preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation of the present invention.

[0016] In the drawings, the same reference numerals are used for the same components and the drawings are schematic and not necessarily drawn to scale.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only one or several embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on such drawings without paying creative work.

[0018] Figure 1 This is a schematic structural diagram of an SBS modified asphalt additive of the present invention; Description of main reference numerals: slow-release shell; 11-Release hole; Filler. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but are not used to limit the present invention.

[0020] Reference Figure 1 In a first aspect, the present invention provides an SBS modified asphalt additive, comprising a slow-release shell 1 and a filler filled in the slow-release shell 1 .

[0021] The sustained-release shell 1 is a polyhedron, and a release hole 11 is provided at the center of a single face thereof. The polyhedron may be any of a cube, a cuboid, a hexahedron, an octahedron, etc. The filler 2 is extruded to form a polyhedron whose particle size is not larger than the release hole 11. The polyhedron may be any of a cube, a cuboid, a hexahedron, an octahedron, etc. A single sustained-release shell 1 is filled with a plurality of fillers 2.

[0022] The components of the sustained-release shell 1 include polysulfone, solvent, and hydrophilic agent; wherein the ratio of polysulfone, solvent, and hydrophilic agent is 1.5:8.5:1, and the polysulfone is dissolved in the solvent to form a liquid, and then injected into a mold for drying and forming. The components of the filler 2 include: 45-50 parts of sulfur, 5-10 parts of calcium carbonate, 10-15 parts of lime, and 5-10 parts of plasticizer; before use, the surface of the sustained-release shell 1 filled with the filler 2 is sprayed with a tackifier.

[0023] Specifically, the solvent is any one of dimethylformamide, dimethylacetamide, N-methyl-2-pyrrolidone, and dimethyl sulfoxide.

[0024] Specifically, the hydrophilic agent is any one of polyvinyl pyrrolidone, lithium chloride and polyethylene glycol.

[0025] Specifically, the tackifier is polyvinyl acetate.

[0026] In a second aspect, the present invention further provides an SBS modified asphalt, comprising the modified asphalt additive described above, and also comprising base asphalt, SBS modifier particles and microcrystalline wax.

[0027] The production steps of the SBS modified asphalt are as follows: S1: After spraying the tackifier on the surface of the modified asphalt additive, put it into the mixer and mix it with the SBS modifier particles. During the mixing process, cold air is blown into the mixer until a single modified asphalt additive adheres to at least one SBS modifier particle.

[0028] S2: preheating the base asphalt and adding microcrystalline wax into the base asphalt to obtain pretreated base asphalt. The microcrystalline wax increases the ductility of the base asphalt, making it difficult for the SBS modifier particles and the asphalt additive to separate during the mixing process.

[0029] S3: The pretreated base asphalt, SBS modifier particles and modified asphalt additives are mixed, heated, sheared, ground and developed to obtain a finished SBS modified asphalt.

[0030] It should be understood that the embodiments disclosed in the present invention are not limited to the specific processing steps or materials disclosed herein, but should be extended to equivalent substitutions of such features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0031] The "embodiment" mentioned in the specification means that the specific features or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. Therefore, the phrases or "embodiment" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0032] In addition, the described features or characteristics may be combined in one or more embodiments in any other suitable manner. In the above description, some specific details, such as thickness, quantity, etc., are provided to provide a comprehensive understanding of the embodiments of the present invention. However, those skilled in the relevant art will understand that the present invention can be implemented without one or more of the above specific details or can also be implemented using other methods, components, materials, etc.

Claims

1. A SBS modified asphalt additive, characterized in that: The invention comprises a sustained-release shell and a filler filled in the sustained-release shell. The sustained-release shell is a polyhedron and a release hole is arranged at the center of a single face of the shell. The components of the sustained-release shell include polysulfone, a solvent and a hydrophilic agent. The ratio of polysulfone, the solvent and the hydrophilic agent is 1.5:8.5:

1. The components of the filler include 45-50 parts of sulfur, 5-10 parts of calcium carbonate, 10-15 parts of lime and 5-10 parts of plasticizer. After the sustained-release shell is filled with the filler, a viscosity enhancer is sprayed on its surface.

2. The SBS modified asphalt additive according to claim 1, characterized in that: The filler is extruded to form a polyhedron whose particle size is no larger than the release hole, and a single sustained-release shell is filled with a plurality of fillers.

3. The SBS modified asphalt additive according to claim 1, characterized in that: The solvent is any one of dimethylformamide, dimethylacetamide, N-methyl-2-pyrrolidone and dimethyl sulfoxide.

4. The SBS modified asphalt additive according to claim 1, characterized in that: The hydrophilic agent is any one of polyvinyl pyrrolidone, lithium chloride and polyethylene glycol.

5. The SBS modified asphalt additive according to claim 1, characterized in that: The tackifier is polyvinyl acetate.

6. A SBS modified asphalt, comprising the modified asphalt additive according to any one of claims 1 to 5, characterized in that: It also includes base asphalt, SBS modifier particles and microcrystalline wax.

7. The SBS modified asphalt according to claim 6, characterized in that The production steps of the SBS modified asphalt are as follows: S1: After spraying the tackifier on the surface of the modified asphalt additive, put it into the mixer and mix it with the SBS modifier particles. During the mixing process, cold air is blown into the mixer until a single modified asphalt additive adheres to at least one SBS modifier particle. S2: preheating the base asphalt and adding microcrystalline wax into the base asphalt to obtain a pretreated base asphalt; S3: The pretreated base asphalt, SBS modifier particles and modified asphalt additives are mixed, heated, sheared, ground and developed to obtain a finished SBS modified asphalt.

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