阅读说明：本技术 速溶型sbr沥青改性剂及其制备方法 (Instant SBR asphalt modifier and preparation method thereof ) 是由 刘滨 相丽敬 高刚 于 2021-09-26 设计创作，主要内容包括：本发明涉及沥青改性剂技术领域,具体涉及一种速溶型SBR沥青改性剂及其制备方法。所述速溶型SBR沥青改性剂,包含以下重量份数的原料：丁苯橡胶SBR90～100份,聚异丁烯5～10份,硬脂酸1～5份,碳酸钙5～40份,软化剂1～10份,聚乙烯蜡1～5份,塑解剂0.3～0.8份,偶联剂0.1～2份,增塑剂0.5～1.5份,内润滑剂0.1～2份,隔离剂0.3～1份。本发明的速溶型SBR沥青改性剂,在应用于沥青改性时,溶解速度快,降低沥青长时高温下的老化,提高沥青的低温性能以及耐候性,增加粘性与附着力,提高使用寿命。(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: the anti-static coating comprises, by weight, 90-100 parts of Styrene Butadiene Rubber (SBR), 5-10 parts of polyisobutylene, 1-5 parts of stearic acid, 5-40 parts of calcium carbonate, 1-10 parts of a softening agent, 1-5 parts of polyethylene wax, 0.3-0.8 part of a peptizer, 0.1-2 parts of a coupling agent, 0.5-1.5 parts of a plasticizer, 0.1-2 parts of an internal lubricant and 0.3-1 part of a 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.)

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 average molecular weight of the polyethylene wax is 2000-5000, the softening point is 100-150 ℃, and the melting point is 60-70 ℃.

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 0.3-0.5 MPa.

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 ℃.

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 artificial organic or inorganic material added into asphalt or asphalt mixture, and can be melted or dispersed in the asphalt to improve or raise 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, patent CN201810986820.0 discloses a high-viscosity asphalt modifier which is composed of sarin resin, POK, M-SEBS, a composite organic filler, a coupling agent, an accelerator, an antioxidant and a lubricant. The asphalt mainly utilizes high molecular polymers such as sarin resin and POK (polyoxymethylene) 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 adhesion, elasticity, 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 long-term and 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; 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 as filler can improve the high temperature performance of asphalt, raise softening point, lower penetration and improve the processing performance during extrusion and granulation.

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 more easily and uniformly dispersed in the preparation process, and meanwhile, the softener is added to break macromolecular chains of the rubber, increase plasticity and improve processability; the breaking of the macromolecular chains also makes the product dissolve in the bitumen more rapidly.

The polyethylene wax has an average molecular weight of 2000-5000-

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 in 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 A89. The peptizer can break the macromolecular chains of the rubber in the mixing stage, reduce the molecular weight of the rubber, increase the plasticity and uniformly disperse all the 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 zinc salt of high molecular weight fatty acid, preferably Aktiplast ST produced by Langshen group.

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 asphalt modifier is prepared from SBR as a main material, and can effectively improve the softening point of asphalt and reduce the penetration degree after being matched with auxiliaries such as stearic acid, calcium powder, polyethylene wax and the like. 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; and 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 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. The modifier has certain viscosity, and the surface of the product is added with the separant after the preparation, so that the sticking of the connecting 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, 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.

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

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 inorganic phases can be promoted, and the aging of the asphalt at a high temperature for a long time can be 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 the starting materials used in the examples are commercially available, except where otherwise 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 action of the softeners on the product is 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 rest auxiliary agents comprise polyisobutylene with the molecular weight of 20000-40000, the peptizer adopts peptizer A89, the plasticizer adopts plasticizer A, the polyethylene wax with the average molecular weight of 2000-40000 and the melting point of 60-70 ℃, the internal lubricant adopts Aktiplast ST produced by Langshan 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 raw material compositions of examples 1 to 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