CN113831615B

CN113831615B - Instant SBR asphalt modifier and preparation method thereof

Info

Publication number: CN113831615B
Application number: CN202111128112.1A
Authority: CN
Inventors: 刘滨; 相丽敬; 高刚
Original assignee: Shandong Gaoshike Industry And Trade Co ltd
Current assignee: Shandong Gaoshike Industry And Trade Co ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2023-01-13
Anticipated expiration: 2041-09-26
Also published as: CN113831615A

Abstract

The invention relates to the technical field of asphalt modifiers, and particularly relates to an instant SBR asphalt modifier and a preparation method thereof. The instant SBR asphalt modifier comprises the following raw materials in parts by weight: 90 to 100 portions of styrene butadiene rubber SBR, 5 to 10 portions of polyisobutylene, 1 to 5 portions of stearic acid, 5 to 40 portions of calcium carbonate, 1 to 10 portions of softener, 1 to 5 portions of polyethylene wax, 0.3 to 0.8 portion of peptizer, 0.1 to 2 portions of coupling agent, 0.5 to 1.5 portions of plasticizer, 0.1 to 2 portions of internal lubricant and 0.3 to 1 portion of separant. When the instant SBR asphalt modifier is applied to asphalt modification, the dissolution speed is high, the long-term high-temperature aging of asphalt is reduced, the low-temperature performance and the weather resistance of the asphalt are improved, the viscosity and the adhesive force are increased, and the service life is prolonged.

Description

Instant SBR asphalt modifier and preparation method thereof

Technical Field

The invention relates to the technical field of asphalt modifiers, and particularly relates to an instant SBR asphalt modifier and a preparation method thereof.

Background

The asphalt modifier is natural or synthetic organic or inorganic material added into asphalt or asphalt mixture, and can be melted or dispersed in the asphalt to improve or increase the pavement performance of the asphalt. For example, in order to improve the mechanical properties (strength, toughness, etc.) of asphalt, polymers, resins, plastics, carbon black, inorganic salts, etc. are added to increase the strength and toughness.

The main purpose of adding the modifier into the asphalt is to improve the road performance of the asphalt mixture at high temperature, reduce the permanent deformation at high temperature, improve the performances of the asphalt mixture in aspects of rutting resistance, fatigue resistance, ageing resistance, low-temperature cracking resistance, low-temperature fatigue resistance and the like, and ensure that the asphalt mixture meets the requirements of traffic conditions during design and use.

At present, the asphalt modifier in the industry has a plurality of types, and when the asphalt modifier is applied to asphalt modification, the asphalt modifier has poor solubility with asphalt, slow dissolution speed and even incomplete dissolution, thereby greatly influencing the production efficiency. In order to improve the solubility of asphalt, the synergistic effect of different components of the modifier is required to be utilized, for example, a high-viscosity asphalt modifier disclosed in patent CN201810986820.0 comprises sarin resin, POK, M-SEBS, a composite organic filler, a coupling agent, an accelerator, an antioxidant and a lubricant. The asphalt mainly utilizes polymer polymers such as sarin resin and POK containing aromatic hydrocarbon and alkyl, has strong mechanical strength and good elasticity, has good solubility with asphalt, can be fully mixed with the asphalt, and improves the adhesiveness, the elasticity, the heat resistance and the like of the asphalt.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: when the instant SBR asphalt modifier is applied to asphalt modification, the dissolution speed is high, the aging of asphalt at long time and high temperature is reduced, the low-temperature performance and weather resistance of the asphalt are improved, the viscosity and adhesive force are increased, and the service life is prolonged; the invention also provides a simple and feasible preparation method.

The instant SBR asphalt modifier comprises the following raw materials in parts by weight:

the molecular weight of the polyisobutene is 20000-40000. The polyisobutylene has good heat resistance, oxygen resistance, ozone resistance, chemical resistance, weather resistance, ultraviolet resistance, acid resistance and alkali resistance, after the polyisobutylene is mixed with the styrene butadiene rubber, the material has good waterproofness and air permeability, and meanwhile, the polyisobutylene with medium molecular weight has good compatibility with the asphalt, so that the dissolving time of the modifier in the asphalt can be reduced.

Calcium carbonate is used as a filler, and can improve the high-temperature performance of asphalt, improve the softening point, reduce the penetration degree and improve the processability during extrusion granulation besides the filling effect.

The softening agent is at least one of polycyclic aromatic hydrocarbon rubber oil, naphthenic base rubber oil and aromatic base rubber. The softener has the functions of softening rubber, so that all components are easier to disperse and uniform in the preparation process, and meanwhile, the softener is added, so that macromolecular chains of the rubber are broken, the plasticity is increased, and the processability is improved; the breaking of the macromolecular chains also makes the product dissolve in the asphalt more rapidly.

The polyethylene wax has average molecular weight of 2000-5000, and melting point of 60-70 deg.C

The coupling agent is at least one of a silane coupling agent KH580, a silane coupling agent KH550 and a silane coupling agent KH 792. The coupling agent can improve the surface activity of the product, plays a role of an interface between the product and asphalt and accelerates the dissolution in the asphalt; meanwhile, the polar functional group plays a role in bridging and is used as an elastic bridging agent between the polar functional group and the asphalt so that the modifier is more stable in the asphalt.

The peptizer is a mixture of DBD (2, 2' -dibenzamidodiphenyl disulfide), a metal organic complex and an organic carrier, and is preferably peptizer A89. The peptizer can break the macromolecular chain of rubber in the mixing stage, reduce the molecular weight of rubber, increase plasticity and uniformly disperse all components; while lowering the molecular weight facilitates the dissolution of the modifier in the asphalt.

The plasticizer is a mixture of saturated fatty acid zinc soap and unsaturated fatty acid zinc soap, and is preferably plasticizer A. The plasticizer A has both internal and external lubricating and dispersing functions, promotes the dispersion of the filler and other auxiliaries, and is beneficial to the dissolution of rubber in asphalt.

The internal lubricant is a zinc salt of a high molecular weight fatty acid, preferably Aktiplast ST produced by langsen corporation.

The isolating agent is calcium stearate. And the release agent is attached to the surface of the finished product to prevent the product from being bonded and agglomerated.

The main material of the asphalt modifier is SBR, and the asphalt modifier is matched with auxiliaries such as stearic acid, calcium powder and polyethylene wax, so that the softening point of asphalt can be effectively improved, and the penetration degree of the asphalt can be reduced. The addition of the softening agent, the peptizer and the plasticizer can enable all components to be dispersed more uniformly, so that the processing performance is improved, and the extrusion granulation process is improved; the performance of the modifier is more stable. Because SBR is a high molecular polymer with large molecular weight and is a nonpolar material, and asphalt is mainly a polar micromolecule, the SBR and the asphalt are difficult to be compatible. The long dissolution time not only affects efficiency, but also the long-time high temperature can cause the aging of asphalt to affect performance. After the SBR is matched with the polyisobutylene with the medium molecular weight, the dissolving speed of the polyisobutylene in the asphalt is increased, and the viscosity of the polyisobutylene is also increased. The addition of the softening agent, the plasticizer and the peptizer can break chains of rubber molecular chains and reduce the molecular weight of the rubber molecular chains; the internal lubricant not only can improve the processing process, but also is beneficial to the dissolution of the modifier in the asphalt; the coupling agent can be used as a surfactant to play an interfacial role and accelerate the dissolution of the modifier; meanwhile, the polar functional group can also play a role in bridging, so that the modifier is more stable. Because the modifier has certain viscosity, the surface of the product is added with the separant after the preparation is finished, so that the bonding block can be effectively prevented.

The preparation method of the instant SBR asphalt modifier comprises the following steps:

adding Styrene Butadiene Rubber (SBR) and polyisobutylene into an internal mixer, banburying for 15-30s, extracting suppository, adding stearic acid, calcium carbonate, a softening agent, polyethylene wax, a peptizer, a coupling agent, a plasticizer and an internal lubricant, banburying for 70-100s, extracting suppository, pressing suppository, banburying for 15-30s, and discharging rubber; and (3) putting the banburying rubber material into an extruder for granulation, cooling the rubber particles in a vibration bed, adding a separant, and uniformly mixing to obtain the self-adhesive waterproof coiled material asphalt modifier.

Wherein the rotating speed of the internal mixer is 40-60r/min, and the top plug pressure is 0.3-0.5MPa.

The glue discharging temperature is not more than 90 ℃.

Compared with the prior art, the invention has the following beneficial effects:

when the instant SBR asphalt modifier is applied to asphalt modification, compared with other SBR asphalt modifiers, the instant SBR asphalt modifier has the advantages that the dissolution speed is high, and the dissolution time is reduced to 2 hours from 6 to 8 hours; the processing is convenient, the dispersion of the asphalt and an inorganic phase can be promoted, and the aging of the asphalt at long time and high temperature is reduced; and the low-temperature performance and weather resistance of the asphalt can be improved by adding a small amount of the asphalt, the viscosity and the adhesive force are increased, and the service life is prolonged.

Detailed Description

All starting materials used in the examples are commercially available, except where specifically indicated.

Examples and comparative examples

Preparing an asphalt modifier according to the composition of the raw materials in the table 1, wherein the softener can be any one or more of polycyclic aromatic hydrocarbon rubber oil, naphthenic base rubber oil and aromatic base rubber, the effects of the softeners on the product are the same, and the mutual replacement has little influence on the performance of the product; the coupling agent can be any one or more of a silane coupling agent KH580, a silane coupling agent KH550 and a silane coupling agent KH792, the effects of the coupling agents on the product are the same, and the mutual replacement has little influence on the performance of the product. For comparison, the softening agents of the examples and the comparative examples adopt polycyclic aromatic hydrocarbon rubber oil, the coupling agent adopts KH550, the molecular weight of polyisobutylene in the rest auxiliary agents is 20000-40000, the peptizer adopts peptizer A89, the plasticizer adopts plasticizer A, the polyethylene wax adopts polyethylene wax with the average molecular weight of 2000-5000 and the melting point of 60-70 ℃, the internal lubricant adopts Aktiplast ST produced by Langshen group, and the isolating agent adopts calcium stearate.

The compositions of the asphalt modifier raw materials of the examples and comparative examples are shown in table 1, in parts by weight of each raw material.

TABLE 1 feed composition for examples 1-4

The asphalt modifier was prepared according to the raw material composition of table 1, with the following steps:

the parameters of the internal mixer are set as follows: rotating at a speed of 50r/min and a top plug pressure of 0.4Mpa, adding Styrene Butadiene Rubber (SBR) and polyisobutylene into an internal mixer, carrying out internal mixing for 20s, carrying out bolt extraction, adding all auxiliary agents except a separant, carrying out internal mixing for 80s, carrying out bolt extraction, carrying out bolt pressing, carrying out internal mixing for 20s, cooling to below 90 ℃, and carrying out rubber discharge; and (3) putting the banburying rubber material into an extruder for granulation, cooling the rubber particles in a vibration bed, adding a separant, and uniformly mixing to obtain the self-adhesive waterproof coiled material asphalt modifier.

The asphalt modifiers prepared in the examples and comparative examples were used for asphalt modification: and (3) directly adding each prepared asphalt modifier into the asphalt in a flowing state according to the proportion of 3% of the mass of the asphalt, and uniformly stirring.

The prepared modified asphalt was subjected to a performance test, and the test results are shown in tables 2 to 3.

TABLE 2 test results

Test items	Test standard	Example 1	Example 2	Example 3	Example 4
						Ductility, cm at 5 DEG C	T0605-2011	150	142	137	135
Kinematic viscosity (135 ℃ C.), mPas	T0625-2011	819	788	912	826
						Penetration, 0.1mm	T0604-2011	53	53	54	54
Softening point, DEG C	T0606-2011	55	54	54	54
						Dissolution time, min	—	150	145	135	120

TABLE 3 test results

Claims

1. An instant SBR asphalt modifier is characterized by comprising the following raw materials in parts by weight:

2. the instant SBR asphalt modifier of claim 1, wherein: the molecular weight of the polyisobutene is 20000-40000.

3. The instant SBR asphalt modifier of claim 1, wherein: the softening agent is at least one of polycyclic aromatic hydrocarbon rubber oil, naphthenic base rubber oil and aromatic base rubber.

4. The instant SBR asphalt modifier of claim 1, wherein: the polyethylene wax has average molecular weight of 2000-5000, softening point of 100-150 deg.c and melting point of 60-70 deg.c.

5. The instant SBR asphalt modifier of claim 1, wherein: the coupling agent is at least one of a silane coupling agent KH580, a silane coupling agent KH550 and a silane coupling agent KH 792.

6. The instant SBR asphalt modifier of claim 1, wherein: the internal lubricant is zinc salt of high molecular weight fatty acid.

7. The instant SBR asphalt modifier of claim 1, wherein: the isolating agent is calcium stearate.

8. A method for preparing the instant SBR asphalt modifier of any one of claims 1-7, which is characterized in that: the method comprises the following steps:

adding Styrene Butadiene Rubber (SBR) and polyisobutylene into an internal mixer, carrying out internal mixing for 15-30s, carrying out bolt extraction, adding stearic acid, calcium carbonate, a softening agent, polyethylene wax, a peptizer, a coupling agent, a plasticizer and an internal lubricant, carrying out internal mixing for 70-100s, carrying out bolt extraction, carrying out bolt pressing, carrying out internal mixing for 15-30s, and carrying out rubber discharge; and (3) putting the banburying rubber material into an extruder for granulation, cooling the rubber particles in a vibration bed, adding a separant, and uniformly mixing to obtain the self-adhesive waterproof coiled material asphalt modifier.

9. The method for preparing the instant SBR asphalt modifier of claim 8, wherein the method comprises the following steps: the rotating speed of the internal mixer is 40-60r/min, and the upper ram pressure is 0.3-0.5MPa.

10. The method for preparing the instant SBR asphalt modifier of claim 8, wherein the method comprises the following steps: the glue discharging temperature is not more than 90 ℃.