CN-114874459-B - Emulsified rubber asphalt material and preparation method thereof

CN114874459BCN 114874459 BCN114874459 BCN 114874459BCN-114874459-B

Abstract

The invention relates to an emulsified rubber asphalt material and a preparation method thereof, wherein the emulsified rubber asphalt material comprises 40-60% of composite colloidal particle modified asphalt and emulsified soap liquid, the preparation method of the composite colloidal particle modified asphalt comprises the steps of firstly preparing low-Mooney reclaimed rubber, then carrying out internal smelting and melt blending on the low-Mooney reclaimed rubber, SBS and maleic anhydride, carrying out screw extrusion granulation to prepare composite colloidal particles, adding the composite colloidal particles into matrix asphalt, and then adding rubber oil, and the emulsified soap liquid consists of a compound cationic emulsifier, self-emulsifying water-based epoxy resin, a stabilizer, a pH regulator and deionized water. The emulsified rubber asphalt material prepared by the invention has high emulsion stability and obvious advantages of high-temperature deformation resistance, low-temperature crack resistance and durability.

Inventors

XU QI
YU LIN
ZHU YAQIN
WANG HONGBING
DONG HAIYUN

Assignees

江苏中宏迅德工程材料科技有限公司
江苏中宏迅德工程材料科技有限公司

Dates

Publication Date: 20260421
Application Date: 20220426
Priority Date: 20220426

Claims (9)

1. The emulsified rubber asphalt material is characterized by comprising composite colloidal particle modified asphalt and emulsified soap liquid, wherein the composite colloidal particle modified asphalt accounts for 40-60% of the emulsified rubber asphalt material in weight, the preparation method of the composite colloidal particle modified asphalt comprises the steps of firstly preparing low-Mooney reclaimed rubber, then carrying out internal smelting and blending on the low-Mooney reclaimed rubber and SBS (styrene butadiene styrene) maleic anhydride, carrying out screw extrusion granulation to prepare composite colloidal particles, adding the composite colloidal particles into matrix asphalt, and then adding rubber oil, wherein the emulsified soap liquid consists of a compound cationic emulsifier, self-emulsifying aqueous epoxy resin, a stabilizer, a pH regulator and deionized water, the preparation process of the low-Mooney reclaimed rubber comprises the steps of desulfurizing rubber powder or waste rubber powder, the Mooney viscosity is less than 30, the low-Mooney reclaimed rubber contains amino, the SBS is of a star-shaped or linear structure, and the particle size of the composite colloidal particles is less than 6 mm; The emulsified rubber asphalt material is prepared by the following preparation method: (1) At 150-300 ℃, carrying out internal smelting and melt blending on the low-Mooney reclaimed rubber, SBS and maleic anhydride, and carrying out screw extrusion granulation to prepare composite colloidal particles; (2) Heating matrix asphalt to a flowing state at 140 ℃, adding composite colloidal particles, stirring and swelling for 1h at 160-180 ℃, adding rubber oil, shearing for 1h at 5000rpm at 170-190 ℃, and stirring and developing for 3h at 500rpm to obtain composite colloidal particle modified asphalt; (3) Taking a compound cationic emulsifier, self-emulsifying the aqueous epoxy resin, adding 50-60 ℃ deionized water, adding a stabilizer, rapidly and uniformly stirring, and adding a pH regulator to adjust the pH value of the emulsion to 1-3 to prepare emulsified soap solution; (4) And (3) synchronously adding the composite colloidal particle modified asphalt and emulsified soap solution into a high-speed shearing machine or a colloid mill, and circulating for 10-20min until the emulsion turns into a grey brown color, so as to prepare the emulsified rubber asphalt.
2. The emulsified rubber asphalt material according to claim 1, wherein the raw materials of the composite colloidal particle modified asphalt comprise composite colloidal particles, rubber oil and matrix asphalt, and the emulsified rubber asphalt material comprises 10-30 wt% of the composite colloidal particles and 1-10 wt% of the rubber oil.
3. An emulsified rubber asphalt material as set forth in claim 1, wherein the base asphalt is 70# or 90# petroleum asphalt for road.
4. The emulsified rubber asphalt material according to claim 1, wherein the raw materials of the composite rubber particles comprise low-Mooney reclaimed rubber, SBS and maleic anhydride, and the mass ratio of the low-Mooney reclaimed rubber to the SBS is (80-90): 5-20): 1-10.
5. The emulsified rubber asphalt material as set forth in claim 1, wherein the emulsified soap solution contains 1-8 wt% of the cationic emulsifier, 5-10 wt% of the self-emulsifying aqueous epoxy resin, and 1-10 wt% of the stabilizer.
6. The emulsified rubber asphalt material as set forth in claim 1, wherein the complex cationic emulsifier is one or more of quaternary ammonium salts, alkylamines, lignin amines, imidazolines, and amidoamines.
7. An emulsified rubber asphalt material as set forth in claim 1, wherein said stabilizer is one or more of calcium chloride, magnesium chloride, sodium chloride, ammonium chloride.
8. The emulsified rubber asphalt material as set forth in claim 1, wherein the pH adjustor is one or more of hydrochloric acid, sulfuric acid, oxalic acid, and formic acid.
9. A method for producing an emulsified rubber asphalt material according to any one of claims 1 to 8, characterized by comprising the steps of: (1) At 150-300 ℃, carrying out internal smelting and melt blending on the low-Mooney reclaimed rubber, SBS and maleic anhydride, and carrying out screw extrusion granulation to prepare composite colloidal particles; (2) Heating matrix asphalt to a flowing state at 140 ℃, adding composite colloidal particles, stirring and swelling for 1h at 160-180 ℃, adding rubber oil, shearing for 1h at 5000rpm at 170-190 ℃, and stirring and developing for 3h at 500rpm to obtain composite colloidal particle modified asphalt; (3) Taking a compound cationic emulsifier, self-emulsifying the aqueous epoxy resin, adding 50-60 ℃ deionized water, adding a stabilizer, rapidly and uniformly stirring, and adding a pH regulator to adjust the pH value of the emulsion to 1-3 to prepare emulsified soap solution; (4) And (3) synchronously adding the composite colloidal particle modified asphalt and emulsified soap solution into a high-speed shearing machine or a colloid mill, and circulating for 10-20min until the emulsion turns into a grey brown color, so as to prepare the emulsified rubber asphalt.

Description

Emulsified rubber asphalt material and preparation method thereof Technical Field The invention relates to an emulsified rubber asphalt material and a preparation method thereof, belonging to the technical field of road material preparation. Background The existing emulsified asphalt is an emulsion which uniformly disperses asphalt into an aqueous phase in a state of fine liquid drops under the action of an emulsifying agent and mechanical force. Emulsified asphalt has significant technical, cost and environmental advantages over hot asphalt and diluted asphalt. The emulsified asphalt can be directly sprayed as adhesive layer oil, penetrating layer oil, fog seal layer and the like, and can also be used as binder for broken stone seal layer and penetrating type pavement. In addition, the emulsified asphalt can be mixed at normal temperature to prepare a cold-mixed and cold-laid mixture, and is used in the field of road preventive maintenance. Along with the rapid development of social economy in China, traffic flow and load pressure are rapidly increased. Conventional emulsified asphalt gradually cannot meet the use requirements of asphalt pavement. In particular, emulsified asphalt has not been able to function as a functional structural layer for roads. Various modifiers have been tried to modify emulsified asphalt. At present, more materials including SBS and SBR latex are used, the modification effect of SBS on hot asphalt is better, but when the SBS is used for modified asphalt emulsification, the process is complex, the requirement on equipment is high, the cost is higher, and the SBS is not ageing-resistant. When SBR latex is used for modification, the requirements on the production process of raw materials are high. The SBR latex polymerized at low temperature can obviously improve the high-low temperature performance of emulsified asphalt, and the SBR latex polymerized at high temperature has general modification effect and poorer high-temperature performance. And according to the difference of charge properties, the SBR latex modified asphalt also needs to be emulsified by matching with an emulsifier with the same charge type. The waste tire rubber is composed of various rubber molecules such as styrene butadiene rubber, isoprene rubber and the like. The rubber asphalt prepared by modifying asphalt with waste rubber can effectively improve the low-temperature crack resistance and high-temperature stability of asphalt and the adhesiveness with aggregate, can reduce black pollution and production cost, and has been widely used. However, the odor problem is always restrained from developing, and the construction at normal temperature can be realized through emulsification, and the odor problem is eradicated. However, the stable preparation of high-performance emulsified rubber asphalt is always an industrial problem due to the constraint of a rubber crosslinked network. Patent CN101173106a discloses a method for preparing rubber powder-asphalt emulsion, the particle size of the rubber powder used in the method is larger, and desulfurization pretreatment is not carried out on the rubber powder, so that the dispersibility of the rubber is poor, and the emulsion stability is poor. Patent CN102660125A discloses a method for preparing waste rubber modified emulsified asphalt, which comprises the steps of pretreating rubber, mixing the rubber with an activator in supercritical CO2, preparing rubber with high sol content by a high-temperature high-pressure method, and modifying and emulsifying asphalt by using the rubber. The method has complex process and high cost, the supercritical CO2 activated rubber is not industrialized all the time, the practical application is difficult to be exerted, and the stability of the emulsified rubber asphalt is not reported. Patent CN103881401a discloses a waste rubber powder modified emulsified asphalt and a preparation method thereof, which realizes successful preparation of the rubber modified emulsified asphalt, but has problems in long-term stability, and the specific implementation effect of the rubber modified emulsified asphalt applied to the mixture is not seen. CN105176115B discloses a kind of SBS rubber powder composite modified asphalt, its composition includes (by mass portion) waste rubber powder 15-21 portions, SBS modifier 2-3 portions, stabilizing agent 0.2-0.4 portion, activating agent 0.03-0.04 portion and asphalt 75-82 portions. The preparation method comprises the steps of preheating matrix asphalt to 180 ℃, adding an SBS modifier into the hot asphalt, performing high-speed shearing and dispersing for 20min, then adding an activator, rubber powder and a stabilizer, and performing high-speed shearing and dispersing for 2h under the condition of 185 ℃, wherein the stability of emulsion formed by the emulsion is unreliable. Disclosure of Invention The invention aims to solve the problems in the background problems and provides an emulsified rubber asphalt