CN105111756B - A kind of high-viscosity modified asphalt additive and its preparation method and application - Google Patents

Abstract

The invention discloses a high-viscosity modified asphalt additive, which is prepared from the following raw materials in parts by weight: 100 parts of modified main agent, 16-32 parts of activator, 25-58 parts of tackifier, and 0.8-3 parts of stabilizer The modified main agent is formed by mixing styrene copolymer and rubber powder. The mass content of styrene copolymer in the modified main agent is 25% to 50%, and the balance is rubber powder. The activator It is environment-friendly rubber oil, the tackifier is petroleum resin, and the stabilizer is sulfur. In addition, the invention also discloses a method for preparing the high-viscosity modified asphalt additive and its application. The high-viscosity modified asphalt additive of the present invention can improve the high-low temperature performance and aging resistance of base asphalt, has simple preparation process and good economy, and can be further applied to the paving of drainage asphalt pavement to prolong the service life of drainage asphalt pavement.

Description

A kind of high-viscosity modified asphalt additive and its preparation method and application

technical field

The invention belongs to the technical field of road asphalt materials, and in particular relates to a high-viscosity modified asphalt additive and its preparation method and application.

Background technique

With the rapid development of social economy, people's demand for travel quality is constantly upgrading, and the concept of "environmental friendliness" is increasingly highlighted in transportation construction. In the field of road engineering, how to improve the use function of the road surface and how to provide the society with a safer, more comfortable and more environmentally friendly road surface function has become a new goal pursued by my country's transportation department in the new era. Looking at the frontiers of technology at home and abroad, drainage asphalt pavement has become one of the best pavement forms to achieve a leap in road surface function and quality due to its outstanding advantages such as high anti-skid performance, low noise, suppression of water mist, prevention of water drift, and reduction of glare.

But everything has two sides, and drainage asphalt pavement is no exception, and it also has certain defects. There are two main problems with drainage asphalt pavement: one is clogging of voids and the other is oxidation of binder. The clogging of voids will lead to the weakening of noise reduction and anti-splashing functions, and its noise level and splashing degree are getting closer and closer to traditional densely graded mixtures, but the use as a road surface is still within an acceptable range. The oxidation of binder is the main factor limiting the service life of drainage asphalt pavement. Compared with traditional densely graded asphalt mixture, the large void ratio of drainage asphalt pavement accelerates the oxidation of binder. Under the action of traffic load and shear force, pavement materials lose stability due to binder oxidation, gradually appear loose, potholes and other phenomena, and finally lead to rough and uneven pavement. Compared with traditional densely graded asphalt mixture, the short service life of drainage asphalt pavement affects its economical use and restricts the wide application of this safe and environmentally friendly pavement. Therefore, it is necessary to develop a high-viscosity modified asphalt with high viscosity (60°C dynamic viscosity of modified asphalt is not less than 20000Pa s), excellent high and low temperature performance, good aging resistance, simple preparation process and good economy. Provide binders suitable for drainage asphalt pavements to minimize binder oxidation and prolong pavement service life.

Contents of the invention

The technical problem to be solved by the present invention is to provide a high-viscosity modified asphalt additive, which can improve the high and low temperature performance and aging resistance of the base asphalt, and the preparation process is simple. Moreover, the utility model has good economic efficiency, and can prolong the service life of the drainage asphalt pavement after use.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a high-viscosity modified asphalt additive, which is characterized in that it is made of the following raw materials in parts by weight: 100 parts of modified main agent, 16-32 parts of activator, 25-58 parts of tackifier, 0.8-3 parts of stabilizer; the modified main agent is formed by mixing styrene copolymer and rubber powder, and the mass content of styrene copolymer in the modified main agent is 25% ~50%, the balance is rubber powder, the activator is environment-friendly rubber oil, the tackifier is petroleum resin, and the stabilizer is sulfur.

The above-mentioned high-viscosity modified asphalt additive is characterized in that it is made of the following raw materials in parts by weight: 100 parts of modified main agent, 18-28 parts of activator, 35-48 parts of tackifier, and 1.0-48 parts of stabilizer 2.0 copies.

The above-mentioned high-viscosity modified asphalt additive is characterized in that it is made of the following raw materials in parts by weight: 100 parts of modified main agent, 20 parts of activator, 42 parts of tackifier, and 1.2 parts of stabilizer.

The above-mentioned high-viscosity modified asphalt additive is characterized in that the styrene copolymer is a star-shaped styrene-butadiene-styrene block copolymer, and the particle size of the rubber powder is 40-80 mesh.

The above-mentioned high-viscosity modified asphalt additive is characterized in that the environment-friendly rubber oil is KN4006 environment-friendly naphthenic rubber oil.

In addition, the present invention also provides a method for preparing the above-mentioned high-viscosity modified asphalt additive. , the stabilizer and the modifying agent mother liquor are dissolved in an organic solvent, and the shear rate is 4500r/min～5000r/min under the condition of shearing for 45min～60min, and after shearing, the temperature is 150°C～160°C Stir under low pressure, and after the organic solvent is completely volatilized, granulate to obtain a high-viscosity modified asphalt additive.

The above-mentioned method is characterized in that the organic solvent is acetone.

The above method is characterized in that the stirring time is 60 minutes to 80 minutes, and the granulation temperature is 140°C to 160°C.

Further, the present invention also provides a method for preparing high-viscosity modified asphalt using the above-mentioned high-viscosity modified asphalt additive, which is characterized in that it comprises the following steps:

Step 1. Heat the base asphalt to 150°C to 160°C, then add the high-viscosity modified asphalt additive into the base asphalt and stir evenly to obtain a mixture; the quality of the high-viscosity modified asphalt additive is 6% to 6% of the mass of the base asphalt 14%;

Step 2, heating the mixture described in step 1 to 175°C-185°C, then shearing for 45min-60min at a shear rate of 4500r/min-5000r/min, after shearing, the mixture is heated at a temperature of Developed at 175°C-185°C for 1h-4h to obtain high-viscosity modified asphalt with dynamic viscosity not lower than 20000Pa·s at 60°C.

The above-mentioned method is characterized in that the base asphalt in step 1 is 90# asphalt.

Compared with the prior art, the present invention has the following advantages:

1. The present invention adopts styrene copolymer, petroleum resin, environment-friendly rubber oil, rubber powder and sulfur as raw materials to prepare high-viscosity modified asphalt additive, wherein, adopting environment-friendly rubber oil as activator can make independent rubber powder particles and benzene Ethylene copolymer particles form an elastic network, making the mixed material a homogeneous system, ensuring high rheology and aging resistance of the material, and the high viscosity modified asphalt prepared by further using the high viscosity modified asphalt additive has good performance. High temperature stability, low temperature crack resistance and aging resistance.

2. The high-viscosity modified asphalt prepared by using the high-viscosity modified asphalt additive of the present invention is applied to the paving of drainage asphalt pavement, which can effectively improve the anti-oxidation and anti-aging properties of the binder for drainage asphalt pavement, and the preparation process is simple and economical It has good performance, improves the service life of drainage asphalt pavement, and can be widely used in the paving of drainage asphalt pavement.

3. Compared with the existing high-viscosity modified asphalt prepared by using the high-viscosity modified asphalt additive of the present invention, the high-viscosity modified asphalt has the advantages of simple preparation method, excellent asphalt performance and low production cost.

The technical solutions of the present invention will be described in further detail below through examples.

detailed description

Example 1

The high-viscosity modified asphalt additive in this embodiment is made of the following raw materials in parts by weight: 100 parts of modified main agent, 20 parts of activator, 42 parts of tackifier, and 1.2 parts of stabilizer; the modified main agent is made of styrene Copolymer and rubber powder are mixed, the mass content of styrene copolymer in the modified main agent is 40%, the balance is rubber powder, and the activator is environment-friendly rubber oil, preferably KN4006 environment-friendly cycloalkyl Rubber oil, the tackifier is petroleum resin, and the stabilizer is sulfur; the styrene copolymer is preferably a star-shaped styrene-butadiene-styrene block copolymer, and the particle size of the rubber powder is preferably It is 80 mesh.

The specific process of preparing high-viscosity modified asphalt additive in this embodiment is as follows:

Mix the modified main agent and the activator evenly to obtain the mother liquor of the modifier, then dissolve the tackifier, the stabilizer and the mother liquor of the modifier in an organic solvent, and shear Cut for 60 minutes, and after shearing, stir at a temperature of 150°C. After the organic solvent is completely volatilized, a solid substance is obtained, and after granulation, a high-viscosity modified asphalt additive is obtained; the organic solvent is preferably acetone, and the organic solvent is preferably acetone. The amount used is enough to fully dissolve the mother liquid of the tackifier, stabilizer and modifier, the stirring time is preferably 70 min, and the granulation temperature is preferably 150°C.

The method for preparing high-viscosity modified asphalt by using the high-viscosity modified asphalt additive of this embodiment comprises the following steps:

Step 1, heating the base asphalt to 155°C, then adding the high-viscosity modified asphalt additive into the base asphalt and stirring evenly to obtain a mixture; the quality of the high-viscosity modified asphalt additive is 7% of the mass of the base asphalt; the base Asphalt is preferably SK-90# asphalt;

Step 2, heating the mixture described in step 1 to 180°C, then shearing for 60 minutes at a shear rate of 4500r/min, and developing the mixture for 2 hours at a temperature of 180°C after shearing, to obtain High viscosity modified bitumen.

According to the test method stipulated in "Highway Engineering Asphalt and Asphalt Mixture Test Regulations" (JTG E20-2011), the relevant technical indicators of the high-viscosity modified asphalt prepared in Example 1 are tested, and compared with TPS prepared by conventional methods The modified asphalt was compared, and the test results are shown in Table 1.

The technical index test result of the high-viscosity modified asphalt prepared in the embodiment 1 of table 1

It can be seen from Table 1 that the indicators of the high-viscosity modified asphalt prepared by using the high-viscosity modified asphalt additive in Example 1 all meet the technical requirements, and its PG high-temperature classification and PG low-temperature classification are consistent with TPS modified asphalt, indicating that It has good high-temperature performance and strong anti-rutting performance, and has comparable low-temperature crack resistance and aging resistance with TPS modified asphalt, but the price of the high-viscosity modified asphalt prepared in Example 1 is lower than that of TPS modified asphalt is much lower, indicating that the high-viscosity modified bitumen has good cost performance.

Example 2

The high-viscosity modified asphalt additive in this embodiment is made of the following raw materials in parts by weight: 100 parts of modified main agent, 18 parts of activator, 48 parts of tackifier, and 2.0 parts of stabilizer; the modified main agent is made of styrene Copolymer and rubber powder are mixed, the mass content of styrene copolymer in the modified main agent is 30%, the balance is rubber powder, and the activator is environment-friendly rubber oil, preferably KN4006 environment-friendly cycloalkyl Rubber oil, the tackifier is petroleum resin, and the stabilizer is sulfur; the styrene copolymer is preferably a star-shaped styrene-butadiene-styrene block copolymer, and the particle size of the rubber powder is preferably It is 60 mesh.

The specific process of preparing high-viscosity modified asphalt additive in this embodiment is as follows:

Mix the modified main agent and the activator uniformly to obtain the mother liquor of the modifier, then dissolve the tackifier, the stabilizer and the mother liquor of the modifier in an organic solvent, and shear Cut for 45 minutes, and after shearing, stir at a temperature of 160 ° C. After the organic solvent is completely volatilized, a solid substance is obtained, and after granulation, a high-viscosity modified asphalt additive is obtained; the organic solvent is preferably acetone, and the organic solvent is preferably acetone. The amount used is enough to fully dissolve the mother liquor of the tackifier, stabilizer and modifier, the stirring time is preferably 80 min, and the granulation temperature is preferably 160°C.

The method for preparing high-viscosity modified asphalt by using the high-viscosity modified asphalt additive of this embodiment comprises the following steps:

Step 1, heating the base asphalt to 160°C, then adding the high-viscosity modified asphalt additive into the base asphalt and stirring evenly to obtain a mixture; the quality of the high-viscosity modified asphalt additive is 10% of the mass of the base asphalt; the base Asphalt is preferably SK-90# asphalt;

Step 2, heating the mixture described in step 1 to 185°C, then shearing for 50min at a shear rate of 5000r/min, and developing the mixture for 1h at a temperature of 185°C after shearing, to obtain High viscosity modified bitumen.

Example 3

The high-viscosity modified asphalt additive in this embodiment is made of the following raw materials in parts by weight: 100 parts of modified main agent, 28 parts of activator, 35 parts of tackifier, and 1.0 part of stabilizer; the modified main agent is made of styrene Copolymer and rubber powder are mixed, the mass content of styrene copolymer in the modified main agent is 45%, the balance is rubber powder, and the activator is environment-friendly rubber oil, preferably KN4006 environment-friendly cycloalkyl Rubber oil, the tackifier is petroleum resin, and the stabilizer is sulfur; the styrene copolymer is preferably a star-shaped styrene-butadiene-styrene block copolymer, and the particle size of the rubber powder is preferably It is 80 mesh.

The specific process of preparing high-viscosity modified asphalt additive in this embodiment is as follows:

Mix the modified main agent and the activator uniformly to obtain the mother liquor of the modifier, then dissolve the tackifier, the stabilizer and the mother liquor of the modifier in an organic solvent, and shear under the condition of a shear rate of 4800r/min Cut for 50 minutes, and after shearing, stir at a temperature of 150 ° C. After the organic solvent is completely volatilized, a solid substance is obtained, and after granulation, a high-viscosity modified asphalt additive is obtained; the organic solvent is preferably acetone, and the organic solvent is preferably acetone. The amount used is enough to fully dissolve the mother liquid of the tackifier, stabilizer and modifier, the stirring time is preferably 60 min, and the granulation temperature is preferably 140°C.

The method for preparing high-viscosity modified asphalt by using the high-viscosity modified asphalt additive of this embodiment comprises the following steps:

Step 1, heating the base asphalt to 150°C, then adding the high-viscosity modified asphalt additive into the base asphalt and stirring evenly to obtain a mixture; the quality of the high-viscosity modified asphalt additive is 12% of the mass of the base asphalt; the base Asphalt is preferably SK-90# asphalt;

Step 2, heating the mixture described in step 1 to 175°C, then shearing for 55min at a shear rate of 4800r/min, and developing the mixture at a temperature of 175°C for 4h after shearing, to obtain High viscosity modified bitumen.

According to the test method stipulated in "Highway Engineering Asphalt and Asphalt Mixture Test Regulations" (JTG E20-2011), the relevant performance indicators of the high-viscosity modified asphalt prepared in Example 2 and Example 3 are tested, and the test results are shown in the table 2.

The high-viscosity modified asphalt technical index test result prepared by table 2 embodiment 2 and embodiment 3

It can be seen from Table 2 that the indicators of the high-viscosity modified asphalt prepared by using the high-viscosity modified asphalt additives in Example 2 and Example 3 all meet the technical requirements, and have good high-temperature performance, strong anti-rutting performance, Excellent low-temperature crack resistance and aging resistance, and the price of the high-viscosity modified asphalt prepared in Example 2 and Example 3 is relatively low, indicating that the high-viscosity modified asphalt has good cost performance.

Example 4

The high-viscosity modified asphalt additive in this embodiment is made of the following raw materials in parts by weight: 100 parts of modified main agent, 16 parts of activator, 25 parts of tackifier, and 0.8 part of stabilizer; the modified main agent is made of styrene Copolymer and rubber powder are mixed, the mass content of styrene copolymer in the modified main agent is 25%, the balance is rubber powder, and the activator is environment-friendly rubber oil, preferably KN4006 environment-friendly cycloalkyl Rubber oil, the tackifier is petroleum resin, and the stabilizer is sulfur; the styrene copolymer is preferably a star-shaped styrene-butadiene-styrene block copolymer, and the particle size of the rubber powder is preferably It is 40 mesh.

The specific process of preparing high-viscosity modified asphalt additive in this embodiment is as follows:

Mix the modified main agent and the activator evenly to obtain the mother liquor of the modifier, then dissolve the tackifier, the stabilizer and the mother liquor of the modifier in an organic solvent, and shear Cut for 55 minutes, and after shearing, stir at a temperature of 155° C. After the organic solvent is completely volatilized, a solid substance is obtained, and after granulation, a high-viscosity modified asphalt additive is obtained; the organic solvent is preferably acetone, and the organic solvent is preferably acetone. The amount used is enough to fully dissolve the mother liquid of the tackifier, stabilizer and modifier, the stirring time is preferably 70 min, and the granulation temperature is preferably 150°C.

The method for preparing high-viscosity modified asphalt by using the high-viscosity modified asphalt additive of this embodiment comprises the following steps:

Step 1, heating the base asphalt to 160°C, then adding the high-viscosity modified asphalt additive into the base asphalt and stirring evenly to obtain a mixture; the quality of the high-viscosity modified asphalt additive is 14% of the mass of the base asphalt; the base Asphalt is preferably SK-90# asphalt;

Step 2, heating the mixture described in step 1 to 180°C, then shearing for 45min at a shear rate of 5000r/min, and developing the mixture for 3h at a temperature of 180°C after shearing, to obtain High viscosity modified bitumen.

Example 5

The high-viscosity modified asphalt additive in this embodiment is made of the following raw materials in parts by weight: 100 parts of modified main agent, 32 parts of activator, 58 parts of tackifier, and 3 parts of stabilizer; the modified main agent is made of styrene Copolymer and rubber powder are mixed, the mass content of styrene copolymer in the modified main agent is 50%, the balance is rubber powder, and the activator is environment-friendly rubber oil, preferably KN4006 environment-friendly cycloalkyl Rubber oil, the tackifier is petroleum resin, and the stabilizer is sulfur; the styrene copolymer is preferably a star-shaped styrene-butadiene-styrene block copolymer, and the particle size of the rubber powder is preferably It is 80 mesh.

The specific process of preparing high-viscosity modified asphalt additive in this embodiment is as follows:

Mix the modified main agent and the activator evenly to obtain the mother liquor of the modifier, then dissolve the tackifier, the stabilizer and the mother liquor of the modifier in an organic solvent, and shear Cut for 60 minutes, and after shearing, stir at a temperature of 160 ° C. After the organic solvent is completely volatilized, a solid substance is obtained, and after granulation, a high-viscosity modified asphalt additive is obtained; the organic solvent is preferably acetone, and the organic solvent is preferably acetone. The amount used is enough to fully dissolve the mother liquor of the tackifier, stabilizer and modifier, the stirring time is preferably 80 min, and the granulation temperature is preferably 160°C.

The method for preparing high-viscosity modified asphalt by using the high-viscosity modified asphalt additive of this embodiment comprises the following steps:

Step 1, heating the base asphalt to 150°C, then adding the high-viscosity modified asphalt additive into the base asphalt and stirring evenly to obtain a mixture; the quality of the high-viscosity modified asphalt additive is 6% of the mass of the base asphalt; the base Asphalt is preferably SK-90# asphalt;

Step 2, heating the mixture described in step 1 to 175°C, then shearing for 50min at a shear rate of 4500r/min, and developing the mixture at a temperature of 170°C for 2h after shearing, to obtain High viscosity modified bitumen.

According to the test method stipulated in "Highway Engineering Asphalt and Asphalt Mixture Test Regulations" (JTG E20-2011), the relevant technical indicators of the high-viscosity modified asphalt prepared in Example 4 and Example 5 are tested, and the test results are shown in the table 3.

The high-viscosity modified asphalt technical index test result prepared by embodiment 4 and embodiment 5 of table 3

It can be seen from Table 3 that all the indicators of the high-viscosity modified asphalt prepared by using the high-viscosity modified asphalt additives in Example 4 and Example 5 all meet the technical requirements, and have good high-temperature performance, strong anti-rutting performance, Excellent low-temperature crack resistance and aging resistance, and the price of the high-viscosity modified asphalt prepared in Example 4 and Example 5 is relatively low, indicating that the high-viscosity modified asphalt has good cost performance.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still belong to the technical aspects of the present invention. within the scope of protection of the scheme.

Claims (7)

1. A kind of 1. method that high-viscosity modified asphalt is prepared using high-viscosity modified asphalt additive, it is characterised in that high viscosity Modified asphalt additive is made up of the raw material of following parts by weight：100 parts of modified host crystal, 18~28 parts of activator, tackifier 35~ 48 parts, 1.0~2.0 parts of stabilizer；The modified host crystal is mixed by styrol copolymer and rubber powder, the modified host crystal The mass content of middle styrol copolymer is 25%~30%, and surplus is rubber powder, and the activator is environment-friendly rubber oil, described Tackifier are Petropols, and the stabilizer is sulphur, and the styrol copolymer is star-like s-B-S Block copolymer；

   The detailed process for preparing the high-viscosity modified asphalt additive is：Modified host crystal and activator are well mixed, changed Tackifier, stabilizer and the modifying agent mother liquor, are then dissolved in organic solvent, are in shear rate by property agent mother liquor 45min~60min is sheared under conditions of 4500r/min~5000r/min, in the condition that temperature is 150 DEG C~160 DEG C after shearing Lower stirring, solid matter is obtained after organic solvent volatilization, high-viscosity modified asphalt additive is obtained after granulation；

   The preparation method of the high-viscosity modified asphalt comprises the following steps：

   Step 1: matrix pitch is heated into 150 DEG C~160 DEG C, high-viscosity modified asphalt additive is then added into matrix drip Stirred in green grass or young crops, obtain mixture；The quality of the high-viscosity modified asphalt additive for matrix pitch quality 6%~ 14%；

   Step 2: mixture described in step 1 is heated into 175 DEG C~185 DEG C, then shear rate be 4500r/min~ 45min~60min is sheared under conditions of 5000r/min, by the mixture in the bar that temperature is 175 DEG C~185 DEG C after shearing 1h~4h is developed under part, obtains the high-viscosity modified asphalt that 60 DEG C of dynamic viscosities are not less than 20000Pas.
2. 2. according to a kind of side that high-viscosity modified asphalt is prepared using high-viscosity modified asphalt additive described in claim 1 Method, it is characterised in that the high-viscosity modified asphalt additive is made up of the raw material of following parts by weight：100 parts of modified host crystal, it is living 20 parts of agent, 42 parts of tackifier, 1.2 parts of stabilizer.
3. 3. according to a kind of side that high-viscosity modified asphalt is prepared using high-viscosity modified asphalt additive described in claim 1 Method, it is characterised in that the granularity of the rubber powder is 40~80 mesh.
4. 4. according to a kind of side that high-viscosity modified asphalt is prepared using high-viscosity modified asphalt additive described in claim 1 Method, it is characterised in that the environment-friendly rubber oil is KN4006 environment-friendly types naphthenic rubber oil.
5. 5. according to a kind of side that high-viscosity modified asphalt is prepared using high-viscosity modified asphalt additive described in claim 1 Method, it is characterised in that the organic solvent is acetone.
6. 6. according to a kind of side that high-viscosity modified asphalt is prepared using high-viscosity modified asphalt additive described in claim 1 Method, it is characterised in that the time stirred described in the preparation process of high-viscosity modified asphalt additive is 60min~80min, institute The temperature for stating granulation is 140 DEG C~160 DEG C.
7. 7. according to a kind of side that high-viscosity modified asphalt is prepared using high-viscosity modified asphalt additive described in claim 6 Method, it is characterised in that matrix pitch described in step 1 is 90# pitches.