Low-viscosity waste rubber powder modified asphalt and preparation method thereof

Abstract

The invention relates to low-viscosity waste rubber powder modified asphalt and a preparation method thereof, and belongs to the field of petroleum asphalt modification, the low-viscosity waste rubber powder modified asphalt comprises the following components by weight: 0.4-0.8 part of heavy aromatic oil; 0.1 to 0.2 part of tar in a glue factory; 0.05 to 0.15 part of polysulfide benzene; 0.1 to 0.3 part of tetraethylenepentamine; 0.2 to 0.4 part of lauryl alcohol polyoxyethylene ether carboxylate symmetrical type succinic acid diester; 25-40 parts of waste rubber powder; and 100 parts of matrix asphalt. The viscosity of the waste rubber powder is reduced, the fluidity of the waste rubber powder is improved, the layering and segregation problems caused by poor interface bonding of the waste rubber powder and the matrix asphalt are effectively prevented, the prepared low-viscosity waste rubber powder modified asphalt has long-term heat storage stability, meanwhile, the production difficulty of the waste rubber powder modified asphalt is reduced, and the production cost is reduced. The performance of the waste rubber powder modified asphalt is improved, and large-scale industrial production is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum asphalt modification, and in particular relates to low-viscosity waste rubber powder modified asphalt and a preparation method thereof. Background Art

[0002] Waste rubber powder asphalt is a rubber powder asphalt made by adding waste rubber powder to asphalt. Adding waste rubber powder to asphalt can absorb light oil in asphalt, swell and degrade, and can significantly improve the low-temperature performance of asphalt. Since the price of waste rubber powder made from waste tires is much cheaper than asphalt, the amount of waste rubber powder added has a great impact on the production cost of rubber powder asphalt. However, the biggest feature of rubber powder asphalt is high viscosity. Affected by viscosity, the amount of waste rubber powder added should not be too large, which directly affects the production cost of rubber powder asphalt. In addition, in the prior art, rubber powder asphalt also has problems such as waste rubber powder is not easy to disperse during the preparation process, poor fluidity caused by high viscosity of rubber powder asphalt at high temperature, and waste rubber powder is easy to separate from asphalt due to poor interface bonding during storage. Although waste rubber powder asphalt has been used on a small scale, it is difficult to achieve large-scale factory-mixed rubber powder asphalt production due to the difficulty in solving these problems. Summary of the invention

[0003] In order to solve the problems of waste rubber powder being difficult to disperse, having high viscosity at high temperature, having poor fluidity, and having difficulty in large-scale production in existing common rubber modified asphalt, the present invention provides a low-viscosity waste rubber powder modified asphalt and a preparation method thereof.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0005] The low-viscosity waste rubber powder modified asphalt of the present invention is composed of the following components in parts by weight:

[0006] Heavy aromatic oil 0.4-0.8 parts;

[0007] Rubber factory tar 0.1-0.2 parts;

[0008] 0.05-0.15 parts of polyphenyl sulfide;

[0009] 0.1-0.3 parts of tetraethylenepentamine;

[0010] 0.2-0.4 parts of symmetrical succinic acid diester of lauryl alcohol polyoxyethylene ether carboxylate;

[0011] 25-40 parts of waste rubber powder;

[0012] 100 parts of base asphalt.

[0013] As a preferred embodiment, the rubber factory tar is waste from the rubber factory, a black solid substance, and its main components are hydrocarbons and aromatic compounds.

[0014] A method for preparing low-viscosity waste rubber powder modified asphalt of the present invention comprises the following steps:

[0015] Step 1, preparing rubber powder asphalt additive;

[0016] After heating the heavy aromatic oil, rubber factory tar, polyphenyl sulfide and tetraethylene pentamine are added in sequence, and the mixture is stirred evenly to obtain a rubber powder asphalt additive;

[0017] Step 2: Pretreatment of waste rubber powder;

[0018] The waste rubber powder is heated by an oil bath heating device, and the waste rubber powder is continuously stirred during the heating process until the waste rubber powder is heated to 90-100° C.; the stirring speed is increased, and the rubber powder asphalt additive is added dropwise at the same time, and the obtained mixture is heated to 130-140° C. after the addition is completed, and the mixture is cooled to 100-120° C. after stirring evenly, and the symmetrical succinic acid diester of lauryl alcohol polyoxyethylene ether carboxylate is added, and the mixture is cooled to room temperature after stirring evenly to obtain the pretreated waste rubber powder;

[0019] Step 3: Heat the base asphalt to 160-168°C, start strong stirring, add the pretreated waste rubber powder, stir to make it fully react, and obtain low-viscosity waste rubber powder modified asphalt.

[0020] As a preferred embodiment, in step one, the heavy aromatic oil is heated to 110°C-130°C, rubber factory tar is added, the temperature is kept constant for 1.5h-2.5h, polybenzene sulfide is added, stirred for 15min-25min, cooled to 75°C-85°C, tetraethylenepentamine is added, stirred for 25min-35min, and the rubber powder asphalt additive is obtained.

[0021] As a preferred embodiment, in step 2, stirring is performed continuously during the heating process, and the stirring speed is 200 r / min-300 r / min.

[0022] As a preferred embodiment, in step 2, the stirring speed is increased to 300 r / min-500 r / min.

[0023] As a preferred embodiment, in step three, strong stirring is started, and the stirring speed is: the stirring speed is 800r / min-1800r / min.

[0024] The beneficial effects of the present invention are:

[0025] The low-viscosity scrap rubber powder modified asphalt of the present invention is composed of heavy aromatic oil, rubber factory tar, polysulfide benzene, tetraethylene pentamine, lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester, scrap rubber powder and matrix asphalt; wherein the heavy aromatic oil, rubber factory tar, polysulfide benzene and tetraethylene pentamine form a rubber powder asphalt additive, the rubber powder asphalt additive can be cross-linked with the carbon-carbon double bonds in the scrap rubber powder, and can also react chemically with the matrix asphalt to form a three-dimensional network structure, so that the scrap rubber powder and the matrix asphalt become a whole, the viscosity of the scrap rubber powder is reduced, and its fluidity is increased, the scrap rubber powder is no longer suspended in the matrix asphalt, and the stratification and segregation problem caused by poor interface bonding between the scrap rubber powder and the matrix asphalt is effectively prevented, so that the prepared low-viscosity scrap rubber powder modified asphalt has long-term thermal storage stability.

[0026] In addition, by pre-treating the waste rubber powder, the S bonds in the waste rubber powder can be further broken, making the waste rubber powder easy to disperse, increasing its own fluidity and compatibility with the matrix asphalt, reducing the segregation of the waste rubber powder, reducing the difficulty of producing waste rubber powder modified asphalt, improving the performance of waste rubber powder modified asphalt, and facilitating large-scale industrial production. Compared with ordinary rubber modified asphalt, the waste rubber powder modified asphalt prepared by the present invention has improved high and low temperature performance.

[0027] The low-viscosity waste rubber powder modified asphalt prepared by the present invention can have an operating temperature controlled at 150°C-170°C (slightly different depending on the base asphalt, but increasing the temperature has no significant effect on the quality). At the same time, the time to reach the maximum torque in industrial production is significantly shortened, which is only 1 / 4 to 1 / 3 of that when no rubber powder asphalt additive is added. Therefore, the low-viscosity waste rubber powder modified asphalt prepared by the present invention can effectively avoid the influence of overheating aging on asphalt performance. DETAILED DESCRIPTION

[0028] The low-viscosity waste rubber powder modified asphalt of the present invention is composed of the following components in parts by weight:

[0029] Heavy aromatic oil 0.4-0.8 parts;

[0030] Rubber factory tar 0.1-0.2 parts;

[0031] 0.05-0.15 parts of polyphenyl sulfide;

[0032] 0.1-0.3 parts of tetraethylenepentamine;

[0033] 0.2-0.4 parts of symmetrical succinic acid diester of lauryl alcohol polyoxyethylene ether carboxylate;

[0034] 25-40 parts of waste rubber powder;

[0035] 100 parts of base asphalt.

[0036] Among them, rubber factory tar is the waste material from the rubber factory, a black solid substance, whose main components are hydrocarbons and aromatic compounds.

[0037] Among them, symmetrical succinic acid diester of lauryl alcohol polyoxyethylene ether carboxylate is a commercial product, or the symmetrical succinic acid diester of lauryl alcohol polyoxyethylene ether carboxylate is synthesized by the following synthesis method: lauryl alcohol polyoxyethylene ether carboxylate is transferred into a reaction kettle, catalyst CeY is added, stirring is started and the temperature is raised to 55-65°C, succinic acid diester is added, and after reacting for 20 minutes, the temperature is raised to 115°C, catalyst CeY is added, and the temperature is continuously controlled at 115-120°C, and symmetrical succinic acid diester of lauryl alcohol polyoxyethylene ether carboxylate is obtained in 20 minutes.

[0038] In addition, the role and function of each component in the formula are as follows:

[0039] Heavy aromatic oil is added to adjust the overall viscosity and improve the compatibility of the components.

[0040] The synergistic effect of rubber factory tar and other additives can improve the compatibility of waste rubber powder and matrix asphalt, and at the same time synergistically act with other additives to improve the performance of low-viscosity waste rubber powder modified asphalt, so that the low-viscosity waste rubber powder modified asphalt prepared by the present invention has improved high and low temperature performance compared with ordinary rubber modified asphalt.

[0041] Tetraethylenepentamine can work synergistically with rubber factory tar to adjust the structure of waste rubber powder, making it easier to dissolve and disperse.

[0042] The synergistic effect of polybenzene sulfide and tetraethylenepentamine can adjust the structure and properties of waste rubber powder, which can further promote the breaking of S bonds in the waste rubber powder, making the waste rubber powder easy to disperse and reducing the difficulty of producing low-viscosity waste rubber powder modified asphalt.

[0043] Symmetrical succinic acid diester of lauryl polyoxyethylene ether carboxylate can both cross-link with the carbon-carbon double bonds in waste rubber powder and react chemically with matrix asphalt to form a three-dimensional network structure, making the waste rubber powder and matrix asphalt a whole, effectively preventing the stratification and segregation problem caused by poor interface bonding between waste rubber powder and matrix asphalt, and making the prepared low-viscosity waste rubber powder modified asphalt have long-term thermal storage stability.

[0044] The present invention provides a method for preparing low-viscosity waste rubber powder modified asphalt, which mainly comprises the following steps:

[0045] Step 1, preparing rubber powder asphalt additive;

[0046] Heat the heavy aromatic oil to 110-130°C, add the rubber factory tar, keep the temperature constant for 1.5-2.5 hours, then slowly add the polysulfide benzene, stir for 15-25 minutes, cool to 75-85°C, add tetraethylene pentamine, stir for 25-35 minutes, and obtain the rubber powder asphalt additive.

[0047] Step 2: Pretreatment of waste rubber powder;

[0048] The waste rubber powder is heated by an oil bath heating device, and is continuously stirred during the heating process at a stirring speed of 200 r / min-300 r / min: until the waste rubber powder is heated to 90-100°C; the stirring speed is increased to 300 r / min-500 r / min, and at the same time, a rubber powder asphalt additive is slowly added (1 drop / s), and the resulting mixture is immediately heated to 130-140°C after the addition is completed, and stirred for 15min-25min. When the rubber powder asphalt additive is completely decomposed, the rubber particles are no longer sticky; the temperature is lowered to 100-120°C, and lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester is added, stirred for 15min-25min, and cooled to room temperature to obtain pretreated waste rubber powder; the pretreated waste rubber powder is stored at room temperature to avoid light.

[0049] Step 3: Heat the base asphalt to 160-168°C and start strong stirring at a speed of 800r / min-1800r / min. Slowly add the pretreated waste rubber powder in small amounts (three times) and stir for 55min-65min (preferably 60min) to allow it to react fully to obtain low-viscosity waste rubber powder modified asphalt.

[0050] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0051] Example 1 Preparation of low-viscosity scrap rubber powder modified asphalt

[0052] (1) Heat 0.4 parts of heavy aromatic oil to 120°C, add 0.1 parts of rubber factory tar, keep the temperature constant for 2 hours, then slowly add 0.05 parts of polyphenyl sulfide and stir for 20 minutes. After cooling to 80°C, add 0.1 parts of tetraethylene pentamine and stir for 30 minutes to obtain the rubber powder asphalt additive.

[0053] (2) Place 25 parts of waste rubber powder in a container, place the container in an oil bath heating device, and heat the waste rubber powder using the oil bath heating device, while stirring the waste rubber powder at a speed of 200 r / min: until the waste rubber powder is heated to 100°C (the temperature test should be the temperature of the hot waste rubber powder, not the oil bath temperature); then increase the stirring speed to 300 r / min, and slowly add the rubber powder asphalt additive prepared above (note that the rubber powder asphalt additive is added by dripping, and needs to be added slowly, and it can be observed during the addition process The waste rubber powder gradually thickens, and the slower the thickening speed, the more uniform the addition of the rubber powder asphalt additive). When all the rubber powder asphalt additives are added, the resulting mixture is immediately heated to 140°C and stirred for 20 minutes to fully react. When the rubber powder asphalt additive is completely decomposed, the rubber particles are no longer sticky; the temperature is lowered to 120°C, 0.2 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester are added, stirred for 20 minutes, and cooled to room temperature to obtain pretreated waste rubber powder; the pretreated waste rubber powder is stored at room temperature to avoid light.

[0054] (3) 100 parts of base asphalt were heated to 168°C and stirred vigorously at a speed of 800 r / min. Pretreated waste rubber powder was slowly added in small amounts step by step and stirred for 60 minutes to allow it to fully react, thereby obtaining low-viscosity waste rubber powder modified asphalt.

[0055] (4) The properties of the low-viscosity waste rubber powder modified asphalt were tested. The test results are shown in Table 1.

[0056] Example 2 Preparation of low-viscosity scrap rubber powder modified asphalt

[0057] (1) Heat 0.8 parts of heavy aromatic oil to 120°C, add 0.2 parts of rubber factory tar, keep the temperature constant for 2 hours, then slowly add 0.15 parts of polyphenyl sulfide, stir for 20 minutes, cool to 80°C, add 0.3 parts of tetraethylene pentamine, stir for 30 minutes to obtain rubber powder asphalt additive.

[0058] (2) 40 parts of waste rubber powder are placed in a container, and the container is placed in an oil bath heating device. The waste rubber powder is heated by the oil bath heating device, and the waste rubber powder is heated while stirring. The stirring speed is 260 r / min until the waste rubber powder is heated to 100°C (the temperature test should be the temperature of the hot waste rubber powder, not the oil bath temperature); then the stirring speed is increased to 360 r / min, and the rubber powder asphalt additive prepared above is slowly added dropwise (note that the rubber powder asphalt additive is added dropwise and needs to be added slowly. The addition process can be observed The waste rubber powder slowly thickens, and the slower the thickening speed, the more uniform the addition of the rubber powder asphalt additive). When all the rubber powder asphalt additives are added, the resulting mixture is immediately heated to 140°C and stirred for 20 minutes to fully react. When the rubber powder asphalt additive is completely decomposed, the rubber particles are no longer sticky. The temperature is lowered to 120°C, 0.4 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester are added, stirred for 20 minutes, and cooled to room temperature to obtain pretreated waste rubber powder. The pretreated waste rubber powder is stored at room temperature to avoid light.

[0059] (3) 100 parts of base asphalt were heated to 168°C and stirred vigorously at a speed of 900 r / min. Pretreated waste rubber powder was slowly added in small amounts step by step and stirred for 60 minutes to allow it to react fully, thereby obtaining low-viscosity waste rubber powder modified asphalt.

[0060] (4) The properties of the low-viscosity waste rubber powder modified asphalt were tested. The test results are shown in Table 1.

[0061] Example 3 Preparation of low-viscosity scrap rubber powder modified asphalt

[0062] (1) Heat 0.6 parts of heavy aromatic oil to 120°C, add 0.15 parts of rubber factory tar, keep the temperature constant for 2 hours, then slowly add 0.1 parts of polyphenyl sulfide, stir for 20 minutes, cool to 80°C, add 0.2 parts of tetraethylene pentamine, stir for 30 minutes to obtain rubber powder asphalt additive.

[0063] (2) 32.5 parts of waste rubber powder are placed in a container, and the container is placed in an oil bath heating device. The waste rubber powder is heated by the oil bath heating device, and the waste rubber powder is heated while stirring at a speed of 200 r / min until the waste rubber powder is heated to 100°C (the temperature test should be the temperature of the hot waste rubber powder, not the oil bath temperature); then the stirring speed is increased to 300 r / min, and the rubber powder asphalt additive prepared above is slowly added dropwise (note that the rubber powder asphalt additive is added dropwise and needs to be added slowly. The temperature can be observed during the addition process). It was observed that the waste rubber powder gradually thickened, and the slower the thickening speed, the more uniform the addition of the rubber powder asphalt additive was). After all the rubber powder asphalt additives were added, the resulting mixture was immediately heated to 140°C and stirred for 20 minutes to fully react. When the rubber powder asphalt additive was completely decomposed, the rubber particles were no longer sticky; the temperature was lowered to 120°C, 0.3 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester was added, stirred for 20 minutes, and cooled to room temperature to obtain pretreated waste rubber powder; the pretreated waste rubber powder was stored at room temperature to avoid light.

[0064] (3) 100 parts of base asphalt were heated to 168°C and stirred vigorously at a speed of 1000 r / min. Pretreated waste rubber powder was slowly added in small amounts step by step and stirred for 60 minutes to allow it to react fully, thereby obtaining low-viscosity waste rubber powder modified asphalt.

[0065] (4) The properties of the low-viscosity waste rubber powder modified asphalt were tested. The test results are shown in Table 1.

[0066] Comparative Example 1

[0067] In the step (1), during the preparation of the rubber powder asphalt additive, no rubber factory tar and tetraethylenepentamine were added, and the rest was the same as in Example 1. The properties of the obtained asphalt were tested, and the test results are shown in Table 1.

[0068] Comparative Example 2

[0069] In the pretreatment of the waste rubber powder in step (2), no lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester was added, and the rest was the same as in Example 1. The properties of the obtained asphalt were tested, and the test results are shown in Table 1.

[0070] Comparative Example 3

[0071] 0.4 parts of heavy aromatic oil, 0.1 parts of rubber factory tar, 0.05 parts of polyphenyl sulfide, 0.1 parts of tetraethylene pentamine, 0.2 parts of lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester and 25 parts of waste rubber powder in Example 1 were directly added to 100 parts of base asphalt and stirred at 168°C for 60 minutes. The properties of the obtained asphalt were tested, and the test results are shown in Table 1.

[0072] Table 1

[0073]

[0074] According to the above test results, the low-viscosity scrap rubber powder modified asphalt obtained in Examples 1-3 of the present invention has a viscosity of 1.1 Pa·s-2.2 Pa·s at 175°C, an elastic recovery of 76%-79% at 25°C, and a separation softening point difference of 1.0°C-1.3°C. Compared with the viscosity at 175°C, elastic recovery at 25°C, and separation softening point difference of Comparative Examples 1-3, the low-viscosity scrap rubber powder modified asphalt obtained in Examples 1-3 of the present invention has lower viscosity and better elastic recovery performance at 25°C, thereby improving the overall performance of the scrap rubber powder modified asphalt.

[0075] The present invention discloses a low-viscosity waste rubber powder modified asphalt and a preparation method thereof. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve the same. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in the present invention. The product of the present invention has been described through a preferred embodiment, and relevant personnel can obviously modify or appropriately change and combine the product described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.

Claims

1. A low-viscosity waste rubber powder modified asphalt, characterized in that: The components are as follows by weight: Heavy aromatic oil 0.4-0.8 parts; Rubber factory tar 0.1-0.2 parts; 0.05-0.15 parts of polyphenyl sulfide; 0.1-0.3 parts of tetraethylenepentamine; 0.2-0.4 parts of symmetrical succinic acid diester of lauryl alcohol polyoxyethylene ether carboxylate; 25-40 parts of waste rubber powder; 100 parts of base asphalt.

2. The low-viscosity scrap rubber powder modified asphalt according to claim 1, characterized in that: The rubber factory tar is a waste material from the rubber factory, a black solid substance, and its main components are hydrocarbons and aromatic compounds.

3. The method for preparing low-viscosity scrap rubber powder modified asphalt according to claim 1 or 2, characterized in that: The following steps are involved: Step 1, preparing rubber powder asphalt additive; After heating the heavy aromatic oil, rubber factory tar, polyphenyl sulfide and tetraethylene pentamine are added in sequence, and the mixture is stirred evenly to obtain a rubber powder asphalt additive; Step 2: Pretreatment of waste rubber powder; The waste rubber powder is heated by an oil bath heating device, and is continuously stirred during the heating process until the waste rubber powder is heated to 90-100°C; The stirring speed is increased, and the rubber powder asphalt additive is added dropwise at the same time. After the addition is completed, the obtained mixture is heated to 130-140° C., stirred evenly, and then cooled to 100-120° C., and lauryl alcohol polyoxyethylene ether carboxylate symmetrical succinic acid diester is added, stirred evenly, and then cooled to room temperature to obtain pretreated waste rubber powder; Step 3: Heat the base asphalt to 160-168°C, start strong stirring, add the pretreated waste rubber powder, stir to make it fully react, and obtain low-viscosity waste rubber powder modified asphalt.

4. The method for preparing low-viscosity scrap rubber powder modified asphalt according to claim 3, characterized in that: In step 1, the heavy aromatic oil is heated to 110-130°C, the rubber factory tar is added, the temperature is kept constant for 1.5-2.5 hours, polybenzene sulfide is added, stirred for 15-25 minutes, cooled to 75-85°C, tetraethylene pentamine is added, stirred for 25-35 minutes, and the rubber powder asphalt additive is obtained.

5. The method for preparing low-viscosity scrap rubber powder modified asphalt according to claim 3, characterized in that: In step 2, stirring is continued during the heating process, and the stirring speed is 200r / min-300r / min.

6. The method for preparing low-viscosity scrap rubber powder modified asphalt according to claim 3, characterized in that: In step 2, the stirring speed is increased to 300 r / min-500 r / min.

7. The method for preparing low-viscosity scrap rubber powder modified asphalt according to claim 3, characterized in that: In step three, start strong stirring at a speed of 800r / min-1800r / min.

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