CN110527308A - A kind of high-modulus asphalt cementitious matter and its preparation method and application - Google Patents

Abstract

The present invention relates to a kind of high-modulus asphalt cementitious matters and its preparation method and application, include de-oiling hard grades of bitumen, slag wax, the agent of waste and old rubber alloy modification, SBS modifier and stabilizer.Waste and old rubber alloy modification agent is made of waste rubber powder and waste plastic.60-90 parts of hard grades of bitumen, 20-40 parts of slag wax, 10-30 parts of waste and old rubber alloy modification agent, 1-5 parts of SBS modifier and 0.2-2.0 parts of stabilizer；For cutting optimal in bituminous pavement to prevent hot car rut and cold cracking.The utility value of oil refining process byproduct and junk is improved, there is biggish economic advantages and important realistic meaning.

Description

A kind of high modulus asphalt binder and its preparation method and application

technical field

The invention belongs to the field of engineering technology and petrochemical technology, and in particular relates to a high-modulus asphalt binder and its preparation method and application.

Background technique

The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art.

"Technical Specifications for Highway Asphalt Pavement Construction" shows that the serious rutting in the south, north and even northeast of my country is mainly due to the high penetration and low modulus of the selected asphalt. In recent years, the middle and lower layers of asphalt pavement structure design have gradually begun to use high modulus asphalt to increase the ability of asphalt pavement to resist high temperature rutting and deformation. High modulus asphalt has a small strain when subjected to a fixed stress load or needs to be loaded with a large stress when a fixed strain is generated, so asphalt has the characteristics of strong deformation resistance; and high modulus asphalt has good bonding performance with aggregates, which can Effectively improve the overall load-bearing capacity of semi-rigid or flexible pavement, suitable for pavement structures in warm regions or under heavy traffic conditions. Therefore, the development and application of high modulus asphalt is of great significance for improving the overall anti-rutting ability of the pavement and reducing the occurrence cycle of pavement diseases.

As a refining process in the process of heavy oil processing, solvent deasphalting technology uses heavy oil such as vacuum residue as raw material, and uses light hydrocarbons such as C3 and C4 as solvents for extraction to obtain extracts ( deasphalted oil) and raffinate (deoiled bitumen). Among them, the content of colloid and asphaltene contained in deoiled asphalt is as high as 70%, and the content of asphaltene is close to 20%. The component characteristics of deoiled hard asphalt determine that it has a high softening point and viscosity, but its low-temperature ductility, elastic recovery performance, and toughness are extremely poor, so it cannot be directly used in road engineering.

The modifiers currently used for asphalt modification are mainly divided into thermoplastic elastomers (such as SBS), rubbers (such as SBR,), resins (such as EVA, PE, etc.). In recent years, waste rubber powder has also been gradually used in the modification of asphalt to improve the low-temperature performance of asphalt, but its use in asphalt is greatly restricted due to its poor compatibility with asphalt.

There have been many patent reports on the performance improvement of high modulus asphalt and hard asphalt. For example, patent CN104650602A discloses a high-grade road hard asphalt and its preparation method, using deoiled asphalt, topping oil slurry, extracted oil and polymer modifiers such as SBS and SBR to prepare a penetration rate of 10-60 1/ High-grade road hard petroleum asphalt within 10mm. Patent CN108384253A uses paraffin-based crude oil vacuum residue hard deoiled asphalt, the remaining catalytic oil slurry after topping, and modifiers as raw materials, and obtains construction asphalt by simple blending under certain conditions. Patent CN105400220A relates to a high-performance asphalt binder used in road asphalt pavement construction, specifically a high-modulus rubber asphalt used in rubber asphalt mixtures and a preparation method thereof. The raw material composition of the high modulus rubber asphalt is as follows: road waste tire rubber powder and agricultural waste plastic film are added to No. 70 base asphalt, natural asphalt, and aromatic oil, and the high modulus rubber asphalt is improved to a certain extent. road performance. Patent CN103102708A prepares high modulus asphalt by adding SBS and high modulus asphalt modifier into base asphalt. Patent CN103834184A prepares high-modulus asphalt by adding SBS to the mixture of high-grade asphalt and low-grade asphalt. The inventors found that the above patents were prepared by either using deoiled asphalt as a raw material and adding aromatic-rich components and a polymer modifier, or by using matrix asphalt as a raw material and adding a polymer modifier. High modulus asphalt, but it needs to be further improved in terms of raw material cost performance and high and low temperature performance.

Contents of the invention

In view of the above-mentioned problems in the prior art, an object of the present invention is to provide a high modulus asphalt binder and its preparation method and application. The invention uses deoiled hard asphalt (DOA) as a basic component, mixed with slag wax rich in linear alkane components, and effectively utilizes waste rubber and waste plastics to prepare high modulus asphalt cement. This high modulus asphalt binder has high modulus and strength, excellent high and low temperature performance, moderate viscosity, and can be used in the middle and lower layers of asphalt pavement to prevent high temperature rutting and low temperature cracking. At the same time, the high modulus asphalt binder and its preparation method provided by the invention make full use of DOA, waste rubber powder, waste plastics and slag wax as raw materials to prepare high modulus asphalt, which improves the utilization value of by-products and wastes in the refining process , to achieve the dual purposes of effectively utilizing DOA and waste and producing high-value-added high-modulus asphalt, and has great economic advantages and important practical significance.

In order to solve the above technical problems, the technical solution of the present invention is:

In the first aspect, a high-modulus asphalt binder includes deoiled hard asphalt (DOA), slag wax, waste rubber-plastic alloy modifier, SBS modifier and stabilizer.

High modulus asphalt binder has high modulus and strength, excellent high and low temperature performance, and moderate viscosity. It can be used in the middle and lower layers of asphalt pavement to prevent high temperature rutting and low temperature cracking. The asphalt binder of the present invention has relatively high dynamic shear modulus, that is to say, it has sufficient resistance to deformation under shear stress. The invention utilizes the compounding technology of deoiled hard asphalt (DOA) and slag wax, waste rubber-plastic alloy modifier, SBS modifier and stabilizer to prepare a kind of high strength, high softening point, dynamic shear modulus high asphalt binder. The existing anti-rutting asphalt binder is to improve the anti-rutting ability by adding PE anti-rutting agent to ordinary road asphalt. This kind of additive can only improve the high-temperature performance of ordinary asphalt, which will lead to rutting or crack. On the basis of the prior art, the present invention fully utilizes the excellent high-temperature performance of DOA and the advantages of rubber-plastic alloys, and DOA can obviously improve the high-temperature performance and shear resistance of the asphalt as the matrix of the asphalt cement.

In some embodiments, the waste rubber-plastic alloy modifier is composed of waste rubber powder and waste plastic.

The waste rubber-plastic alloy modifier of the present invention can give full play to the improvement effects of waste rubber powder and waste plastic on the low-temperature performance and high-temperature performance of asphalt respectively; utilize the characteristics that the solubility parameters between rubber powder and plastic are relatively close, and utilize certain The process method melts and blends the two, and improves the high-temperature performance of waste rubber powder and asphalt after modification through early diffusion and infiltration. At the same time, it improves the compatibility of waste plastics and asphalt, and uses complementary advantages to improve each other as a Effective modifier of DOA.

In some embodiments, the high modulus asphalt binder comprises 60-90 parts by mass of deoiled hard asphalt (DOA), 20-40 parts of slag wax, 10-30 parts of waste rubber-plastic alloy modifier, SBS 1-5 parts of modifier and 0.2-2.0 parts of stabilizer; preferably 65-75 parts of deoiled hard asphalt, 25-35 parts of slag wax, 15-25 parts of waste rubber and plastic alloy modifier, SBS modifier 4-5 parts and 0.5-1.0 parts of stabilizer.

Within the above ratio range, waste rubber-plastic alloy as a modifier and SBS modifier can better improve and improve the high and low temperature resistance of the matrix component deoiled hard asphalt.

In some embodiments, the mass ratio of waste rubber powder: waste plastic is 3:7-7:3; preferably 3:4-4:3. Within the above range, the performance characteristics of waste rubber powder and waste plastic can be integrated. An out of range effect on the overall modifier properties.

In some embodiments, the waste rubber powder has a mesh size of 20 mesh to 110 mesh, preferably 20 mesh, 30 mesh, 40 mesh, 50 mesh, 60 mesh, 70 mesh, 80 mesh, 90 mesh, 100 mesh, and 110 mesh.

In some embodiments, the deoiled hard asphalt (DOA) is one or a combination of propane deoiled asphalt, butane deoiled asphalt and pentane deoiled asphalt.

Preferably, the content of saturated and aromatic components in deoiled hard asphalt (DOA) should be >20%.

In some embodiments, the slag wax refers to liquid wax with a melting point of 90° C.-110° C. and containing solid impurities such as catalysts with a particle size of 20-200 um.

The present invention selects slag wax with a higher melting point and mixes it with the deoiled hard asphalt component, which has better compatibility with the deoiled hard asphalt component, so that the deoiled hard asphalt has a stronger binding force and can withstand high and low temperatures. Performance is better.

In some embodiments, the waste plastics are recycled waste plastic packaging bags that have been crushed and screened, and the main component is polyethylene.

In some embodiments, the SBS modifier has a linear or star-shaped molecular structure, a block ratio of S/B of 20/80-50/50, and a molecular weight of 70,000-230,000.

In some embodiments, the stabilizer is a sulfur-type structure, preferably one or more of elemental sulfur, S40, S60 or S90.

Second aspect, a kind of preparation method of high modulus asphalt binder, concrete steps are:

Mix waste rubber powder and waste plastic, extrude, granulate, and dry to obtain waste rubber-plastic alloy modifier granules;

Add slag wax to the deoiled hard asphalt after heating to obtain mixture A, and then add SBS modifier, waste rubber-plastic alloy modifier particles, and stabilizer to mixture A under heating conditions to obtain high modulus asphalt binder.

In some embodiments, the temperature for extruding the mixed waste rubber powder and waste plastic is 160-220°C; preferably 180-220°C.

Extrusion of existing waste plastic materials, the temperature of the machine head is set to a high temperature. In this application, the entire extrusion process is higher than the extrusion temperature in the prior art. The temperature setting of the extruder makes the waste rubber powder and waste Plastics are able to blend better, forming a uniform and stable modifier.

In some embodiments, the method of extruding the waste rubber powder and waste plastic after mixing is as follows: after the mixture is extruded, enter the cooling water for straightening, granulation, and circulate three times to obtain the extruded material.

In some embodiments, the deoiled hard asphalt is heated to 140-160° C. and mixed with slag wax. Heating the deoiled hard asphalt makes the deoiled hard asphalt have good fluidity.

In some embodiments, mixture A is heated to a temperature of 150-180°C.

The application of the above-mentioned high-modulus asphalt binder in the asphalt pavement middle surface layer and the anti-rutting layer of the asphalt surface layer.

Beneficial effects of the present invention:

(1) The high modulus asphalt binder provided by the present invention has higher modulus and strength, and excellent high and low temperature performance, moderate viscosity, and can be used in the middle and lower layers of asphalt pavement to prevent high temperature rutting and low temperature cracking.

(2) The high modulus asphalt binder provided by the present invention fully utilizes DOA, waste rubber powder, waste plastics and slag wax as raw materials. It realizes the dual purpose of effective utilization of DOA and waste and production of high value-added high modulus asphalt, which has great economic advantages and important practical significance.

(3) The waste rubber-plastic alloy modifier of the present invention can give full play to the improvement effects of waste rubber powder and waste plastics on the low-temperature performance and high-temperature performance of asphalt respectively, and improve the improvement of waste rubber powder and asphalt modification through early diffusion and infiltration. At the same time, improve the compatibility of waste plastics and asphalt, and use complementary methods to improve each other as an effective modifier of DOA.

Detailed ways

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof. Below in conjunction with embodiment the present invention is further described

Example 1

A preparation method of high modulus asphalt binder, comprising the steps of:

(1) Set the temperature of the twin-screw extruder to 180°C and keep the temperature constant for 1h. Weigh 500g of waste rubber powder and 500g of waste plastic, pre-mix first, then pour the pre-mixed raw materials into the feeding tank, set and adjust the feeding speed and extrusion speed. When the strips are extruded, they are straightened in cooling water and sent to the granulator for granulation to ensure the continuity of the process. After all the raw materials are sent out, the granules are poured into the feed tank for the second extrusion, and the cycle is repeated for a total of three extrusions. Subsequently, the pellets were dried in an oven at 110° C. for 30 minutes to obtain waste rubber-plastic alloy modifier pellets.

(2) Heat the propane deoiled asphalt to about 150°C in an oven until the deoiled hard asphalt has good fluidity. Weigh 600g of deoiled hard asphalt, add 300g of slag wax, and mechanically stir for 20min at a speed of 1200rpm to make the two evenly blended.

(3) Add 30 g of SBS modifier under the action of a high-speed shearing machine with a temperature of 165° C. and a rotational speed of 4000 rpm, and continue shearing for 15 minutes.

(4) Weigh 150 g of the waste rubber-plastic alloy modifier prepared in step (1), add it into the system of step (3), and continue shearing for 40 minutes.

(5) Weigh 5 g of the stabilizer, add it to the system of step (4), and continue shearing for 10 min.

(6) Stir mechanically at 150° C. for 20 minutes at a rotational speed of 1000 rpm to prepare a high modulus asphalt binder. The properties of the obtained asphalt binder are shown in Table 1.

Table 1 embodiment performance index

performance unit value Softening Point ℃ 72 Penetration 1/10mm 39 10℃ ductility cm 27.5 Dynamic Viscosity at 60°C Pa·s 1345.7 Residual penetration ratio after TFOT % 81.3 Dynamic shear modulus G*(under 60℃) Pa 63887

Example 2

A preparation method of high modulus asphalt binder, comprising the steps of:

(1) Set the temperature of the twin-screw extruder to 200°C and keep the temperature constant for 1h. Weigh 380g of waste rubber powder and 500g of waste plastic, pre-mix first, then pour the pre-mixed raw materials into the feeding tank, set and adjust the feeding speed and extrusion speed. When the strips are extruded, they are straightened in cooling water and sent to the granulator for granulation to ensure the continuity of the process. After all the raw materials are sent out, the granules are poured into the feed tank for the second extrusion, and the cycle is repeated for a total of three extrusions. Subsequently, the pellets were dried in an oven at 105° C. for 25 minutes to obtain waste rubber-plastic alloy modifier pellets.

(2) Heat the butane deoiled asphalt to 140°C in an oven until the deoiled hard asphalt has good fluidity. Weigh 650g of deoiled hard asphalt, add 350g of slag wax, and mechanically stir for 25min at a speed of 1300rpm to make the two evenly blended.

(3) Add 35g of SBS modifier under the action of a high-speed shearing machine with a temperature of 170°C and a rotational speed of 4500rpm, and continue shearing for 15 minutes.

(4) Weigh 170 g of the waste rubber-plastic alloy modifier prepared in step (1), add it to the system in step (3), and continue shearing for 50 minutes.

(5) Weigh 6g of stabilizer, add it into the system of step (4), and continue shearing for 15 minutes.

(6) Stir mechanically at 155° C. for 20 minutes at a rotational speed of 1200 rpm to prepare a high modulus asphalt binder. The properties of the obtained asphalt binder are shown in Table 2.

Table 2 embodiment performance index

performance unit value Softening Point ℃ 74 Penetration 1/10mm 37 10℃ ductility cm 30 Dynamic Viscosity at 60°C Pa·s 1412 Residual penetration ratio after TFOT % 80.2 Dynamic shear modulus G*(under 60℃) Pa 68121

Example 3

A preparation method of high modulus asphalt binder, comprising the steps of:

(1) Set the temperature of the twin-screw extruder to 220°C and keep the temperature constant for 1h. Weigh 500g of waste rubber powder and 380g of waste plastic, pre-mix first, then pour the pre-mixed raw materials into the feeding tank, set and adjust the feeding speed and extrusion speed. When the strips are extruded, they are straightened in cooling water and sent to the granulator for granulation to ensure the continuity of the process. After all the raw materials are sent out, the granules are poured into the feed tank for the second extrusion, and the cycle is repeated for a total of three extrusions. Subsequently, the pellets were dried in an oven at 120° C. for 20 minutes to obtain waste rubber-plastic alloy modifier pellets.

(2) Heat the mixture of propane deoiled asphalt and pentane deoiled asphalt to 160°C in an oven until the deoiled hard asphalt has good fluidity. Weigh 750g of deoiled hard asphalt, add 450g of slag wax, and mechanically stir for 25min at a speed of 1400rpm to make the two evenly blended.

(3) Add 50 g of SBS modifier under the action of a high-speed shearing machine with a temperature of 180° C. and a rotational speed of 5000 rpm, and continue shearing for 15 minutes.

(4) Weigh 190 g of the waste rubber-plastic alloy modifier prepared in step (1), add it into the system of step (3), and continue shearing for 50 minutes.

(5) Weigh 8g of stabilizer, add it into the system of step (4), and continue shearing for 15min.

(6) Stir mechanically at 165° C. for 25 minutes at a rotational speed of 1400 rpm to prepare a high modulus asphalt binder. The properties of the obtained asphalt binder are shown in Table 3.

Table 3 embodiment performance index

performance unit value Softening Point ℃ 75.1 Penetration 1/10mm 37 10℃ ductility cm 29 Dynamic Viscosity at 60°C Pa·s 1489 Residual penetration ratio after TFOT % 82.0 Dynamic shear modulus G*(under 60℃) Pa 69187

Comparative example 1

Compared with Example 1, waste rubber powder is not added.

Comparative example 2

Compared with Example 1, 300g of old rubber powder and 800g of waste plastics.

Comparative example 3

Compared with Example 1, the asphalt is road AH-70 No. asphalt.

The properties of the asphalt binder obtained in Comparative Examples 1-3 are shown in Table 4.

Table 4 embodiment performance index

From the comparison between Table 4 and Table 1-3, it can be seen that the combination of waste plastics and matrix components alone will reduce the strength of asphalt binder, and the mixing of waste plastics and waste rubber powder will further increase the strength of asphalt binder. For road AH-70, the dynamic shear modulus of asphalt binder formed with other components is small.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a kind of high-modulus asphalt cementitious matter, it is characterised in that: including de-oiling hard grades of bitumen, slag wax, waste and old rubber alloy modification Agent, SBS modifier and stabilizer.

2. high-modulus asphalt cementitious matter according to claim 1, it is characterised in that: waste and old rubber alloy modification agent is by waste and old Rubber powder and waste plastic composition.

3. high-modulus asphalt cementitious matter according to claim 1, it is characterised in that: the de-oiling hard grades of bitumen including mass parts 60-90 parts, 20-40 parts of slag wax, 10-30 parts of waste and old rubber alloy modification agent, 1-5 parts of SBS modifier and stabilizer 0.2-2.0 Part；

Preferably, de-oiling hard grades of bitumen 65-75 parts, 25-35 parts of slag wax, 15-25 parts of waste and old rubber alloy modification agent, SBS modification 4-5 parts and stabilizer 0.5-1.0 parts of agent.

4. high-modulus asphalt cementitious matter according to claim 1 or 3, it is characterised in that: the agent of waste and old rubber alloy modification by Waste rubber powder and waste plastic composition, waste rubber powder: the mass ratio of waste plastic is 3:7-7:3；

Preferably, waste rubber powder: the mass ratio of waste plastic is 3:4-4:3；

Preferably, waste rubber powder mesh number is -110 mesh of 20 mesh.

5. high-modulus asphalt cementitious matter according to claim 1, it is characterised in that: de-oiling hard grades of bitumen is propane de-oiling drip The combination of one or more of blueness, butane de-oiled asphalt and pentane de-oiled asphalt.

6. high-modulus asphalt cementitious matter according to claim 1, it is characterised in that: saturation point and virtue in de-oiling hard grades of bitumen Perfume (or spice) point content answers > 20%.

7. high-modulus asphalt cementitious matter according to claim 1, it is characterised in that: slag wax is to refer to that fusing point is 90 DEG C -110 DEG C, the liquid wax containing solid impurities such as the catalyst that partial size is 20-200um.

8. high-modulus asphalt cementitious matter according to claim 1, it is characterised in that: waste plastic is to recycle and be crushed The waste plastic packaging bag of screening, main component are polyethylene.

9. a kind of preparation method of high-modulus asphalt cementitious matter, it is characterised in that: specific steps are as follows:

Waste rubber powder and waste plastic are mixed, extrusion processing is carried out, is granulated, is dried to obtain waste and old rubber alloy modification agent Grain；

Slag wax is added after the heating of de-oiling hard grades of bitumen, obtains mixture A, mixture A sequentially adds SBS under heating conditions and changes Property agent, waste and old rubber alloy modification agent particle, stabilizer obtain high-modulus asphalt cementitious matter；

Preferably, the temperature that waste rubber powder and waste plastic carry out squeezing out processing after mixing is 160-220 DEG C；Further preferably 180-220℃；

Preferably, the method for squeezing out processing is carried out after waste rubber powder and waste plastic mixing are as follows: after mixture squeezes out, into cooling It is straightened, is granulated in water, circulation obtains squeezing out the material after processing three times；

Preferably, it is mixed after de-oiling hard grades of bitumen is heated to 140-160 DEG C with slag wax.Heating de-oiling hard grades of bitumen makes de-oiling hard Pitch has good mobility；

Preferably, the temperature of mixture A heating is 150-180 DEG C.

10. application of any high-modulus asphalt cementitious matter of claim 1-8 in pavement structure.