CN112812581A - Gel modified asphalt additive, preparation method thereof and asphalt modification method - Google Patents

Abstract

The invention discloses a gel modified asphalt additive, a preparation method thereof and a modification method of asphalt. The gel modified asphalt additive is divided into two components, the alkali metal alkali and the saponifiable organic acid resin acid are independent from each other, and do not contact with each other to react, so that a substance which is difficult to melt in asphalt at high temperature is not generated, and the melting temperature of the additive in the matrix asphalt is greatly reduced.

Description

Gel modified asphalt additive, preparation method thereof and asphalt modification method

Technical Field

The invention belongs to the technical field of asphalt modification, and particularly relates to a gel modified asphalt additive, a preparation method thereof and a modification method of asphalt.

Background

The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.

Some organic matters have lipophobic polar ends and oleophilic nonpolar end tails after saponification, and the organic matters can be aggregated when being added into asphalt, so that the asphalt develops towards a gel type trend, modified asphalt is generated, the softening point and the viscosity of the asphalt are improved, and the asphalt has better viscoelasticity and temperature sensitivity.

The existing asphalt additive is prepared by heating saponifiable organic acid and resin acid, adding unsaturated organic compound, pumping the mixture into a kneader, adding liquid alkali, mixing, reacting, evaporating the heat and water, changing the mixture from liquid state to solid state, and taking out of the kneader to obtain massive solid, i.e. the obtained additive block. After the solid is cooled, it is pulverized into a powdery additive. When the modified asphalt is required to be used, the powdery additive is conveyed to a modified asphalt production line, added into hot matrix asphalt and stirred to produce the modified asphalt. By adopting the preparation method, the powdery additive can be produced in one place and then transported to another place to produce the modified asphalt by utilizing the local matrix asphalt. The modified asphalt does not need to be transported remotely, the problem that the modified asphalt cannot be transported remotely due to cooling is solved, and meanwhile, the transportation cost can be saved.

However, the inventors found that the preparation method and the prepared additive have the following problems:

1. the prepared additive block is difficult to completely melt in the asphalt at 200 ℃, and the additive block needs to be processed into relatively fine powder and then added into the matrix asphalt for reaction, so that the production process is complex; a large amount of labor is needed in the process of taking the additive out of the pot and crushing; the additive can be crushed only after being cooled and dried for one day after being taken out of the pot, and the production time is long; in high temperature and humid environments (e.g., rainy season in summer), the additive is prone to moisture absorption and is difficult to pulverize into relatively fine powder.

2. The prepared powder additive has serious dust pollution in the production process and when being added into the matrix asphalt, and is difficult to pass the environmental protection requirement.

3. The prepared powder additive needs to be sealed during storage, and mainly NaOH in the raw materials is deteriorated and lost when being wetted and contacting air, while the specific surface area is increased due to the powder, and the powder additive is easy to agglomerate after being wetted and cannot be used. Since the powder additive itself contains a small amount of moisture, even if the sealing is good, there is a blocking phenomenon when the piled pile is stored for a long time under pressure.

4. The prepared powder additive has particles with larger particle size (larger than 1mm) which are added into the matrix asphalt and are difficult to melt, and the particles are wrapped into small groups by the asphalt and are difficult to react, so that the particles do not completely participate in the reaction, the performance of the modified asphalt is influenced, and the cost of asphalt modification is increased.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a gel modified asphalt additive, a preparation method thereof and a modification method of asphalt.

To solve the above technical problem, one or more of the following embodiments of the present invention provide the following technical solutions:

in a first aspect, the present invention provides a gel modified asphalt additive comprising a first component comprising an alkali metal base and a base asphalt and a second component comprising a saponifiable organic acid, a resin acid and a non-saturated organic compound, which are independent of each other.

In a second aspect, the invention provides a preparation method of the gel modified asphalt additive, which comprises the preparation of a component I and the preparation of a component II;

the preparation of the component one is as follows: adding alkali metal base into the heated matrix asphalt, and shearing and stirring uniformly to obtain the asphalt;

the preparation of the component two is as follows: adding unsaturated organic compound into the heated mixture of saponifiable organic acid and resin acid, and mixing uniformly.

In a third aspect, the invention provides a method for modifying asphalt by using the gel modified asphalt additive, which comprises the following steps:

heating the base asphalt to over 195 ℃;

adding the first component into the heated matrix asphalt, stirring to melt the matrix asphalt, adding the second component into the matrix asphalt, and uniformly stirring to obtain the asphalt.

In a fourth aspect, the invention provides modified asphalt prepared by the modification method.

Compared with the prior art, one or more technical schemes of the invention have the following beneficial effects:

1. the gel modified asphalt additive is divided into two components, the alkali metal alkali and the saponifiable organic acid resin acid are independent from each other, and do not contact with each other to react, so that a substance which is difficult to melt in asphalt at high temperature is not generated, and the melting temperature of the additive in the matrix asphalt is greatly reduced.

2. To improve the uniformity of distribution of the alkali metal base in the base asphalt and to prevent precipitation of the alkali metal base in the hot base asphalt, a portion of the unsaturated organic compound is added to component one to combine with the alkali metal base to increase the product viscosity and prevent precipitation of the alkali metal base.

3. Because the alkali metal alkali is prepared into the component I by mechanical shearing in advance, the gel modified asphalt is produced by stirring, the equipment is simple, and the manufacturing cost is low.

4. The first component can be poured into a paper box lined with a plastic bag after being cut, cooled to normal temperature, made into blocks with certain mass and stored, when in use, the whole blocks are put into matrix asphalt and can be melted for use at about 140 ℃. And after the second component is prepared, the second component is filled into containers such as a packaging bag, an iron bucket and the like, or the second component can be transported to a modified asphalt processing plant by adopting a tank truck, pumped into a special tank for storage, and heated to 80 ℃ during use and pumped into the matrix asphalt, so that the first component and the second component can completely participate in the reaction in the matrix asphalt heated to about 200 ℃. The production process has high mechanization degree, short time and high efficiency, and is not interfered by weather. And the modified additive does not need to be prepared into powder, and has no dust pollution.

5. Alkali metal bases such as NaOH and the like are wrapped in a large finished product by matrix asphalt with good sealing property, and the matrix asphalt contains no moisture, is difficult to be affected with moisture and contact with air, is easier to store and has longer shelf life.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. 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 is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

In a first aspect, the present invention provides a gel modified asphalt additive comprising a first component comprising an alkali metal base and a base asphalt and a second component comprising a saponifiable organic acid, a resin acid and a non-saturated organic compound, which are independent of each other.

In some embodiments, the alkali metal base is an alkali metal hydroxide, such as sodium hydroxide.

Furthermore, in the component I, the mass ratio of the alkali metal base to the matrix asphalt is 28-40: 100.

In some embodiments, in component two, the saponifiable organic acid and the resin acid are provided in the form of tall oil.

Furthermore, in the component II, the mass ratio of the unsaturated organic compound to the tall oil is 10-15: 100.

To improve the uniformity of distribution of the alkali metal base in the composition comprising the alkali metal base and the base asphalt, and to prevent precipitation of the alkali metal base in the hot base asphalt, a portion of the unsaturated organic compound is added to the composition and combined with the alkali metal base to increase the product viscosity and prevent precipitation of the alkali metal base, but without significantly increasing the temperature at which the composition melts in the asphalt. At the same time, the amount of unsaturated organic compounds incorporated in the saponifiable organic acid resin acid is correspondingly reduced.

For this purpose, in some embodiments, component one further comprises an unsaturated organic compound, and the mass ratio of the unsaturated organic compound to the base asphalt is 10-15: 100. Furthermore, in the component II, the mass ratio of the unsaturated organic compound to the tall oil is 6-8: 100.

Still further, the unsaturated organic compounds include, but are not limited to, oxidized polyolefin EE-2, modified wax H260, or H360.

In some embodiments, the gel-modified asphalt additive further comprises a third component that is an amine or amide nitrogen-containing compound. When in use, the aggregation of the saponified substance can be further strengthened, and the technical index of the modified asphalt is improved.

Further, the amine or amide nitrogen-containing compounds include, but are not limited to, alkyl fatty polyamines, ethylene bis stearamide, ethylene bis lauramide, or ethylene bis oleamide.

In a second aspect, the invention provides a preparation method of the gel modified asphalt additive, which comprises the preparation of a component I and the preparation of a component II;

the preparation of the component one is as follows: adding alkali metal base into the heated matrix asphalt, and shearing and stirring uniformly to obtain the asphalt;

the preparation of the component two is as follows: adding unsaturated organic compound into the heated mixture of saponifiable organic acid and resin acid, and mixing uniformly.

In some embodiments, the temperature of the heated base asphalt during the preparation of component one is 170-190 ℃.

Further, in the preparation process of the component one, after the alkali metal base is added, the shearing and stirring speed is 6000-7000 rpm, and the shearing time is 8-12 minutes.

In some embodiments, the temperature of the heated mixture of saponifiable organic acid and resin acid is 120-140 ℃ during the preparation of component two.

Further, after the unsaturated organic compound is added, the stirring speed is 60-80 r/s, and the stirring time is 8-12 minutes.

In a third aspect, the invention provides a method for modifying asphalt by using the gel modified asphalt additive, which comprises the following steps:

heating the base asphalt to over 195 ℃;

adding the first component into the heated matrix asphalt, stirring to melt the matrix asphalt, adding the second component into the matrix asphalt, and uniformly stirring to obtain the asphalt.

In some embodiments, the mass ratio of component one, component two, and the base asphalt is 1-1.5:2-2.5: 100.

In some embodiments, the temperature after heating the base asphalt is 195-.

In some embodiments, the second component is added to the base asphalt after being heated to flow.

Further, the temperature of the component two after being heated is more than 80 ℃.

In some embodiments, the method further comprises the step of adding an amine or amide nitrogen-containing compound to the base asphalt.

Furthermore, the mass ratio of the amine or amide nitrogen-containing compound to the matrix asphalt is 0.1-3: 100.

In a fourth aspect, the invention provides modified asphalt prepared by the modification method.

Example 1

The method comprises the following steps:

1. taking 1000g of No. 70 matrix asphalt of the Qilu refinery, and heating to 180 ℃;

2. 350g of granular alkali NaOH is added and sheared for 10 minutes to obtain the component one.

3. Taking 1000g of tall oil, and heating to 130 ℃;

4. 125g of oxidized polyolefin EE-2 was added thereto and stirred for 10 minutes to obtain component two.

5. Taking 1000g of Qilu 70 matrix asphalt, and heating to 200 ℃;

6. adding 11.5g of the first component, and stirring for 10 minutes to melt;

7. adding 22.5g of the second component, and stirring for 10 minutes to obtain the final product.

Example 2

The method comprises the following steps:

1. 1000g of Korean SK90 matrix asphalt is taken and heated to 180 ℃;

2. 350g of granular alkali NaOH and 100g of modified wax H-260 are added, and the mixture is sheared for 12 minutes to obtain a component I.

3. Taking 1000g of tall oil, and heating to 140 ℃;

4. 80g of modified wax H-260 was added thereto, and stirred for 10 minutes to obtain component two.

5. 1000g of Korean SK90 matrix asphalt is taken and heated to 200 ℃;

6. adding 12.5g of the first component, and stirring for 10 minutes to melt;

7. adding 21.5g of the second component, and stirring for 10 minutes to obtain the compound.

Example 3

The method comprises the following steps:

1. taking 1000g of No. 70 matrix asphalt of Huangdao refinery, and heating to 185 ℃;

2. 350g of granular alkali NaOH and 100g of modified wax H-360 are added, and the mixture is sheared for 11 minutes to obtain a component I.

3. Taking 1000g of tall oil, and heating to 130 ℃;

4. 80g of modified wax H-360 is added and stirred for 10 minutes to obtain a component II.

5. Taking 1000g of No. 70 substrate asphalt of yellow island refinery, and heating to 200 ℃;

6. adding 12.5g of the first component, and stirring for 10 minutes to melt;

7. adding 21.5g of the second component and 10g of ethylene bis stearamide, and stirring for 10 minutes to obtain the water-based paint.

The modified asphalt was prepared 5 times as in example 1, and the test indexes are shown in table 1:

table 1 example 1 modified asphalt test index table

As can be seen from table 1, the experimental results of example 1, although satisfying the specifications, are not stable. Due to the poor uniformity of the first component, when a small amount of the first component is taken to prepare the modified asphalt, NaOH in the first component is possibly slightly more or slightly less, so that the deviation of the ratio of NaOH to tall oil in the second component is caused, the modification chemical reaction is not good, and the softening point of the modified asphalt is slightly low.

The modified asphalt was prepared 5 times as in example 2, and the test indexes are shown in table 2:

table 2 example 2 modified asphalt test index table

As can be seen from Table 2, example 2 better solves the problem of NaOH uniformity, and the experimental results are more stable without lower results.

The modified asphalt was prepared 5 times as in example 3, and the test indexes are shown in Table 3:

table 3 example 3 modified asphalt test index table

As can be seen from Table 3, example 3, with the addition of ethylene bis stearamide, has a higher overall softening point. The modified asphalt with high softening point and high viscosity can still be obtained.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A gel modified asphalt additive is characterized in that: the asphalt comprises a first component and a second component which are independent from each other, wherein the first component comprises alkali metal base and matrix asphalt, and the second component comprises saponifiable organic acid, resin acid and unsaturated organic compound.

2. The gel modified asphalt additive of claim 1 wherein: the alkali metal base is an alkali metal hydroxide;

furthermore, in the component I, the mass ratio of the alkali metal base to the matrix asphalt is 28-40: 100;

further, in the second component, the saponifiable organic acid and the resin acid are provided in the form of tall oil;

furthermore, in the component II, the mass ratio of the unsaturated organic compound to the tall oil is 10-15: 100;

further, the component I also comprises unsaturated organic compounds, and the mass ratio of the unsaturated organic compounds to the matrix asphalt is 10-15: 100;

furthermore, in the component II, the mass ratio of the unsaturated organic compound to the tall oil is 6-8: 100.

3. The gel modified asphalt additive of claim 1 wherein: the unsaturated organic compounds include, but are not limited to, oxidized polyolefin EE-2, modified wax H260 or H360.

4. The gel modified asphalt additive of claim 1 wherein: the gel modified asphalt additive also comprises a third component, wherein the third component is an amine or amide nitrogen-containing compound;

further, the amine or amide nitrogen-containing compounds include, but are not limited to, alkyl fatty polyamines, ethylene bis stearamide, ethylene bis lauramide, or ethylene bis oleamide.

5. A process for preparing a gel-modified asphalt additive as claimed in any one of claims 1 to 4, wherein: the preparation method comprises the steps of preparing a component I and preparing a component II;

the preparation of the component one is as follows: adding alkali metal base into the heated matrix asphalt, and shearing and stirring uniformly to obtain the asphalt;

the preparation of the component two is as follows: adding unsaturated organic compound into the heated mixture of saponifiable organic acid and resin acid, and mixing uniformly.

6. The method of claim 5, wherein: in the preparation process of the first component, the temperature of the heated matrix asphalt is 170-190 ℃;

further, in the preparation process of the component I, after the alkali metal base is added, the shearing and stirring speed is 6000-7000 r/s, and the shearing time is 8-12 minutes;

in some embodiments, the temperature of the heated mixture of saponifiable organic acid and resin acid is 120-140 ℃ during the preparation of component two.

7. The method of claim 5, wherein: after the unsaturated organic compound is added, the stirring speed is 60-80 r/s, and the stirring time is 8-12 minutes.

8. A method for modifying asphalt with the gel modified asphalt additive as described in any one of claims 1 to 4, wherein: the method comprises the following steps:

heating the base asphalt to over 195 ℃;

adding the first component into the heated matrix asphalt, stirring to melt the matrix asphalt, adding the second component into the matrix asphalt, and uniformly stirring to obtain the asphalt.

9. The modification method according to claim 8, characterized in that: the temperature of the heated matrix asphalt is 195-205 ℃;

in some embodiments, component two is added to the base asphalt after heated flowing;

further, the temperature of the component II after being heated is more than 80 ℃;

further, the mass ratio of the component I, the component II and the matrix asphalt is 1-1.5:2-2.5: 100;

further, the method also comprises the step of adding amine or amide nitrogen-containing compounds into the base asphalt;

furthermore, the mass ratio of the amine or amide nitrogen-containing compound to the matrix asphalt is 0.1-3: 100.

10. A modified asphalt prepared by the modification method of claim 9.