CN112457679B

CN112457679B - High-performance rubber asphalt and preparation method thereof

Info

Publication number: CN112457679B
Application number: CN202011331047.8A
Authority: CN
Inventors: 董大伟; 江宽; 刘双旺; 董进学; 马庆杰; 颜亮; 武晋巍
Original assignee: Beijng Environmental Protection Technology Co ltd Wing Tai Luther
Current assignee: Beijng Environmental Protection Technology Co ltd Wing Tai Luther
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2022-03-11
Anticipated expiration: 2040-11-24
Also published as: CN112457679A

Abstract

The invention belongs to the technical field of compositions of asphalt materials and preparation methods thereof, and discloses high-performance rubber asphalt and a preparation method thereof. The preparation method comprises the steps of uniformly mixing rubber powder, a rubber activating agent and a stabilizing agent to obtain a mixture A, and then stirring the mixture A of 1/2, asphalt and SBS at a constant temperature to obtain a mixture B; grinding the mixture B by using a grinder to obtain a mixture C, adding the rest mixture A into the mixture C, and stirring at a constant temperature to obtain a mixture D; and grinding the mixture D, and then keeping the temperature and stirring to obtain the finished product rubber asphalt. Compared with the existing rubber asphalt, the high-performance rubber asphalt provided by the invention has the advantages that the rubber powder addition proportion is high, the comprehensive physical properties of the rubber asphalt are excellent, the elasticity of the asphalt mixture is more sufficient, the high-temperature anti-rutting capability (dynamic stability at 60 ℃) is strong, and the probability of rutting on the road surface is low.

Description

High-performance rubber asphalt and preparation method thereof

Technical Field

The invention belongs to the technical field of compositions of asphalt materials and preparation methods thereof, and particularly relates to high-performance rubber asphalt and a preparation method thereof.

Background

The rubber asphalt is a material formed by combining rubber powder particles according to a certain fineness gradation proportion, simultaneously adding a plurality of high polymer modifiers and fully swelling and reacting the rubber powder particles with matrix asphalt under the fully mixed high-temperature condition (over 180 ℃). Compared with the traditional asphalt material, the rubber asphalt has the advantages of long durability, fatigue resistance and service life, capability of resisting fatigue cracks and reflection cracks generated on a pavement, strong high-temperature permanent deformation resistance, strong low-temperature crack resistance, noise reduction and the like, and is widely used.

The rubber asphalt has the advantages that the rubber asphalt is embodied by the proportion of the doped rubber powder, and after a large amount of rubber powder is doped, the durability, the fatigue crack resistance of a pavement, the crack reflection capability, the high-temperature permanent deformation resistance, the low-temperature crack resistance and the noise reduction capability of the asphalt material are improved. At present, the addition amount of rubber powder in the rubber asphalt in the industry is generally between 15 and 24 percent, and the doping amount of the rubber powder is continuously increased on the basis of the addition amount of the rubber powder, so that the elasticity, the high-temperature performance and other performances of the rubber asphalt can be continuously improved; however, the high-proportion rubber powder doping amount can cause the high-temperature viscosity of the prepared rubber asphalt to be increased sharply, and then the workability is influenced, so that the pavement is difficult to compact, and the comprehensive physical properties of the pavement are influenced.

In order to continuously improve the comprehensive physical properties of the rubber asphalt while increasing the doping amount of the rubber powder and ensure that the rubber asphalt has enough workability (the high-temperature viscosity is not too high and is generally not more than 4pa. s at 180 ℃), the inventor carries out technical research and development and obtains the high-performance rubber asphalt.

Disclosure of Invention

The invention aims to provide high-performance rubber asphalt and a preparation method thereof, and aims to solve the problems that the conventional rubber asphalt rubber powder is low in doping amount and poor in comprehensive road performance, and particularly the asphalt mixture is poor in elasticity and high-temperature rutting resistance.

In order to achieve the purpose, the invention provides the following technical scheme that the high-performance rubber asphalt comprises the following raw materials, by mass, 100 parts of asphalt, 30-45 parts of rubber powder, 0.5-2 parts of SBS, 0.1-1.5 parts of rubber activating agent and 0.2-0.4 part of stabilizing agent.

The invention also provides another basic scheme, namely a preparation method of the high-performance rubber asphalt, which comprises the following steps,

uniformly mixing rubber powder, a rubber activating agent and a stabilizing agent to obtain a mixture A;

step two, heating the asphalt to 220 ℃ of 210-;

grinding the mixture B at a grinding gap of 0.1-0.6mm to obtain a mixture C;

step four, stirring the mixture C for 1-6h at the temperature of 210-220 ℃, adding the rest mixture A, stirring for 20-45min at the temperature of 500-800rpm to obtain a mixture D;

step five, grinding the mixture D again at a grinding gap of 0.1-0.6mm to obtain a mixture E, and stirring the mixture E at the temperature of 210-220 ℃ for 1-6h to obtain a finished product of the rubber asphalt; the stirring speed is 500-800 rpm.

The technical principle and the beneficial effects of the technical scheme are as follows:

in the preparation process, firstly, the rubber powder, the rubber activating agent and the stabilizing agent are fully mixed to form a mixture A, so that all materials can be uniformly mixed; moreover, as the asphalt has certain viscosity, the rubber powder, the rubber activating agent and the stabilizing agent are fully mixed and then added into the asphalt, so that the rubber powder, the rubber activating agent and the stabilizing agent can be fully mixed with the asphalt and various materials, and the large-particle-size substances can be ground through grinding, so that the mixing uniformity is further improved. And after grinding, adding the mixture A again, so that the rest mixture A is uniformly mixed with the fully mixed materials, and the mixing uniformity is improved.

In the process of preparing the high-performance rubber asphalt, firstly, mixing the rubber powder, the rubber activating agent and the stabilizing agent to ensure that the materials can be quickly and uniformly mixed with the asphalt and the SBS; and the mixture of the rubber powder, the rubber activating agent and the stabilizing agent is added in two times, so that the mixing uniformity can be improved. And grind each material in the preparation process, can enough grind the material of great particle size, can promote the mixing homogeneity between each material again to promote the performance of the high performance rubber asphalt of preparation.

According to the high-performance rubber asphalt provided by the technical scheme, a large amount of rubber powder is added, so that the elasticity of the prepared rubber asphalt is increased, and the performances of the prepared rubber asphalt are increased; after the high-performance rubber asphalt provided by the technical scheme is prepared into the asphalt mixture, the dynamic stability of the asphalt mixture can be greatly improved. For example, the dynamic stability of the prepared AC-13 mixture can reach 8400-9500 times/mm, the minimum standard regulation of the dynamic stability in JTGF40-2004 technical Specification for road asphalt pavement construction is 2800 times/mm, and the high-performance rubber asphalt provided by the technical scheme can enable the prepared mixture to far exceed the standard regulation. Meanwhile, compared with the existing rubber asphalt, the high-temperature anti-rutting capability (namely the dynamic stability) of the rubber asphalt is greatly improved.

According to the actual operation, it is known that the viscosity of the rubber asphalt at 180 ℃ is drastically increased by adding a large amount of rubber powder. However, through research, the inventor configures the raw materials and the preparation method for preparing the high-performance rubber asphalt, can control the viscosity of the prepared rubber asphalt at 180 ℃ within a standard range while adding a large amount of rubber powder, so as to realize the practical use of the rubber asphalt and greatly improve the performances in all aspects.

Further, the rubber activator is a rubber activator 420, 450 regenerated rubber activator, 480 regenerated rubber activator, DD (diphenyl disulfide), or allicin.

Has the advantages that: experiments prove that the high-performance rubber asphalt prepared by using the raw materials as the rubber activating agent has good performances.

Further, the stabilizer is sulfur, TMTD (accelerator), DCP (crosslinking agent), accelerator M or rubber accelerator DPTU.

Has the advantages that: experiments prove that the comprehensive physical property is better, and the comprehensive pavement performance of the asphalt mixture is improved.

Further, the raw materials comprise, by mass, 100 parts of asphalt, 45 parts of rubber powder, 1 parts of SBS, 1 part of rubber activator and 0.3 part of stabilizer.

Has the advantages that: experiments prove that the high-performance rubber asphalt prepared from the materials according to the proportion has the best effect.

Further, the particle size of the rubber powder is 20-80 meshes.

Has the advantages that: the rubber powder with the particle size range can be conveniently and fully mixed with other materials and can be uniformly melted.

Further, the temperature of the heat preservation is 215 ℃.

Has the advantages that: can realize the sufficient melting of all materials and is convenient for uniform mixing.

Further, the stirring rates were all 650 rpm.

Has the advantages that: the materials are fully mixed.

Further, the grinding gap in the third step is 0.5 mm.

Has the advantages that: the uniformity of mixing is improved.

Further, the grinding gap in the fifth step is 0.4 mm.

Has the advantages that: can complete the grinding of all materials and the sufficient mixing at the same time.

Drawings

FIG. 1 is a longitudinal sectional view of a high-shear emulsifying machine used in example 11 of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: jar body 1, discharge gate 11, sealed lid 2, feed inlet 21, (mixing) shaft 3, driving gear 31, closing plate 32, stirring vane 33, helical blade 34, drive shaft 4, driven gear 41, ring gear 5, shearing net 6, shearing blade 61.

The invention provides high-performance rubber asphalt, which comprises the following raw materials of asphalt, rubber powder, SBS, rubber activator and stabilizer. Wherein the asphalt is petroleum asphalt; the particle size of the rubber powder is 20-80 meshes, and the rubber powder is rubber particles made of one or more of waste truck tires, sedan tires and bicycle tires; the rubber activator is rubber activator 420, 450 regenerated rubber activator, 480 regenerated rubber activator, DD (diphenyl disulfide) or allicin; the stabilizer is sulfur, TMTD (accelerator), DCP (crosslinking agent), accelerator M or rubber accelerator DPTU.

The raw material parameters of the high-performance rubber asphalt provided by the invention in examples 1-10 are shown in Table 1.

TABLE 1

The examples differ only in the parameters as shown in table 1.

The preparation method of the high-performance rubber asphalt comprises the following steps:

screening rubber powder with a proper particle size, weighing the rubber powder, a rubber activating agent and a stabilizing agent according to the measurement, and putting the rubber powder, the rubber activating agent and the stabilizing agent into high-speed stirring and mixing equipment; starting high-speed stirring and mixing equipment, and fully mixing the rubber powder, the rubber activating agent and the stabilizing agent to obtain a mixture A.

Step two, weighing the asphalt and the SBS according to the measurement, putting the asphalt into a mixing tank, heating the asphalt to 210-220 ℃, adding the mixture A of the weighed SBS and 1/2, and stirring for 20-45min at the temperature of 210-220 ℃ and the stirring speed of 500-800rpm to form a mixture B. The heating temperature and the heat preservation temperature are both 215 ℃, the stirring speed is 650rpm, and the stirring time is 30 min.

And step three, putting the mixture B into a high-speed shearing emulsifying machine, wherein the grinding gap of the high-speed shearing emulsifying machine is 0.1-0.6mm, and the grinding gap of the high-speed shearing emulsifying machine is set to be 0.5 mm. And starting the high-speed shearing emulsifying machine to finish fully grinding the mixture B and form a mixture C.

Step four, putting the mixture C into the mixing tank again, and stirring for 1-6h at the temperature of 210-220 ℃ and the heat preservation speed of 500-800 rpm; then adding the rest mixture A, and stirring at the temperature of 210 ℃ and 220 ℃ at the speed of 500 rpm and 800rpm for 20-45min to obtain a mixture D. In the step, the heat preservation temperature is 215 ℃, the stirring speed is 650rpm, the first stirring time is 5 hours, and the second stirring time is 30 minutes.

And step five, putting the mixture D into a high-speed shearing emulsifying machine, and setting the grinding gap of the high-speed shearing emulsifying machine to be 0.4 mm. And starting the high-speed shearing emulsifying machine, and fully grinding the mixture D to obtain a mixture E. And then the mixture E is put into a mixing tank and stirred for 1-6h at the temperature of 210-220 ℃ and the heat preservation speed of 800rpm at 500-800 ℃ to prepare the high-performance rubber asphalt finished product. In the step, the heat preservation temperature is 215 ℃, the stirring speed is 650rpm, and the stirring time is 6 hours.

Examples 1 to 10 differ only in the parameters shown in Table 1.

Example 11:

example 11 differs from example 1 only in that, as shown in fig. 1, a high-speed shearing emulsifying machine is used which includes a tank 1, a heating passage is provided on an outer wall of the tank 1, and a heat source is communicated with the heating passage (for example, water, oil, liquid metal, etc. are introduced into the heating passage). The top of the jar body 1 is provided with the sealed lid 2, is equipped with feed inlet 21 on the sealed lid 2, and the bottom of the jar body 1 is equipped with discharge gate 11. The feed inlet 21 is provided with a sealing plug, and the discharge outlet 11 is internally provided with a discharge valve.

A motor is fixed on the inner side of the sealing cover body 2, a stirring shaft 3 is coaxially fixed on a driving shaft 4 of the motor, and a driving gear 31 is coaxially fixed on the stirring shaft 3; the sealed cover body 2 is also rotatably connected with a driving shaft 4, and a driven gear 41 meshed with the driving gear 31 is coaxially fixed on the driving shaft 4. The inner wall of the tank body 1 is rotatably connected with an inner gear ring 5, the inner gear ring 5 is coaxially arranged with the tank body 1, and the inner gear ring 5 is meshed with the driven gear 41.

The bottom of ring gear 5 is fixed with shearing net 6, is provided with polylith shearing blade 61 on the outer wall of shearing net 6, all is equipped with a plurality of through-holes on shearing net 6 and the shearing blade 61. The number of the shearing blades 61 is set according to actual requirements, and the number of the shearing blades 61 is 4 in the embodiment and is uniformly distributed on the outer side of the shearing net 6. The shearing blades 61 are pressed against the inner wall of the can body 1.

A sealing plate 32 which is pressed against the inner wall of the shearing net 6 is coaxially fixed on the stirring shaft 3. The bottom of (mixing) shaft 3 is fixed with helical blade 34, is located on the (mixing) shaft 3 and is equipped with stirring vane 33 between helical blade 34 and closing plate 32, and stirring vane 33 is provided with the polylith, is provided with 3 in this embodiment, and the distance between one side that stirring vane 33 kept away from (mixing) shaft 3 and the shearing net 6 inner wall is 0-5mm, and 3mm is chooseed for use in this embodiment.

When the material feeding device is used, raw materials are fed into the tank body 1 through the feeding hole 21, and then the feeding hole 21 is sealed. Starting a motor, driving the stirring shaft 3 to rotate by the motor, further realizing the rotation of the driving gear 31, driving the shearing net 6 to rotate by the inner gear ring 5 through the transmission of the driven gear 41, and the rotation direction of the shearing net 6 is opposite to that of the stirring shaft 3.

When the stirring shaft 3 rotates, the helical blade 34 rotates, and by providing the shearing net 6, a relatively sealed state is formed between the stirring shaft 3 and the helical blade 34, so that the helical blade 34 can transfer the raw material at the bottom upward and shear by the rotation of the stirring blade 33. Simultaneously, be provided with the through-hole on the shearing net 6 to cooperation helical blade 34 lasts upwards transmits the raw materials, can make the raw materials from the through-hole in the space that shearing net 6 constitutes of allotting, at this in-process, can carry out better shearing to the raw materials.

When shearing 6 rotations in the net, can drive shearing blade 61 and rotate, can shear the raw materials in the outside to through-hole on shearing blade 61 can provide great shearing force for the raw materials, improves the effect of cuting, thereby makes raw materials (pitch) can reach better homogenization, the effect of melting. Meanwhile, the shearing blade 61 can move relative to the inner wall of the tank body 1, so that raw materials adhered to the inner wall of the tank body 1 are scraped, and the raw materials are prevented from aging. In the process, the position exchange of the raw materials at the upper part and the lower part can be realized, and the homogenization and melting effects among the raw materials are further improved.

Experiment:

set up 3 sets of comparison examples were compared to the respective properties of the examples, and the respective parameters of the comparative examples are shown in table 2.

TABLE 2

Comparative example	Asphalt	Rubber powder	SBS	Rubber activator	Stabilizer
							1	100	35	1	2	0.3
2	100	35	1	0	0.3
						3	100	35	0	1.5	0

The rubber asphalts provided in examples 1 to 11 and comparative examples 1 to 3 were tested using JTG F40-2004 "technical Specification for construction of road asphalt pavement" as a test basis, and data shown in Table 3 were obtained.

TABLE 3

	Viscosity at 180 ℃	Softening point	Penetration at 25 ℃	Ductility at 5 DEG C	Difference of softening point for 48h
						Unit of	Pa.s	℃	0.1mm	cm	℃
Standard of merit	≤5	≥45	≥30	≥10	≤5
						Example 1	1.85	72	46	18	3.9
Example 2	2.2	76	44	16	2.2
						Example 3	2.8	79	43	15	2.1
Example 4	3.0	82	40	13	1.8
						Example 5	2.0	72	47	12	2.9
Example 6	3.0	85	41	21	1.4
						Example 7	3.3	81	41	11	2.5
Example 8	1.2	66	51	24	1.8
						Example 9	2.4	70	46	12	3.3
Example 10	1.8	79	41	18	2.0
						Example 11	1.65	75	48	21	2.1
Comparative example 1	0.7	58	58	27	5.8
						Comparative example 2	7.5	79	36	9	3.3
Comparative example 3	1.2	63	51	6	＞10

The rubber asphalt provided in examples 1 to 11 and comparative examples 1 to 3 was used to prepare an AC-13 asphalt mixture, which was then tested using JTGF40-2004 "technical specification for road asphalt pavement construction" as the test basis, and some of the results are shown in table 4.

TABLE 4

In conclusion, after a large amount of rubber powder is added into the high-performance rubber asphalt provided by the invention, the performances of the rubber asphalt are greatly improved, particularly the viscosity of the rubber asphalt at 180 ℃ is moderate, the construction difficulty of the rubber asphalt mixture is not greatly increased, and the standard requirement can be met.

It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and these changes and modifications should not be construed as affecting the performance of the invention and its practical application.

Claims

1. The preparation method of the high-performance rubber asphalt is characterized by comprising the following steps: comprises the following steps of (a) carrying out,

uniformly mixing 30-45 parts by mass of rubber powder, 0.1-1.5 parts by mass of rubber activator and 0.2-0.4 part by mass of stabilizer to obtain a mixture A, wherein the stabilizer is sulfur, TMTD accelerator, DCP crosslinking agent, accelerator M or rubber accelerator DPTU;

step two, heating 100 parts by mass of asphalt to 210-220 ℃, adding 0.5-2 parts by mass of mixture A of SBS and 1/2, and stirring for 20-45min at the temperature of 210-220 ℃ to obtain mixture B, wherein the stirring speed is 500-800 rpm;

grinding the mixture B at a grinding gap of 0.1-0.6mm to obtain a mixture C;

2. The process for producing high-performance rubberized asphalt according to claim 1, characterized in that: the rubber activator is rubber activator 420, 450 regenerated rubber activator, 480 regenerated rubber activator, diphenyl disulfide DD or allicin.

3. The process for producing high-performance rubberized asphalt according to claim 2, characterized in that: the rubber powder comprises, by mass, 100 parts of asphalt, 45 parts of rubber powder, 1 parts of SBS, 1 part of rubber activator and 0.3 part of stabilizer.

4. The process for producing high-performance rubberized asphalt according to claim 3, characterized in that: the particle size of the rubber powder is 20-80 meshes.

5. The process for producing high-performance rubberized asphalt according to claim 1, characterized in that: the temperature for heat preservation was 215 ℃.

6. The process for producing high-performance rubberized asphalt according to claim 5, characterized in that: the stirring rate was 650 rpm.

7. The process for producing high-performance rubberized asphalt according to claim 6, characterized in that: the grinding gap in step three was 0.5 mm.

8. The process for producing high-performance rubberized asphalt according to claim 7, characterized in that: and the grinding gap in the fifth step is 0.4 mm.