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CN-122011505-A - Odor removing agent for road rubber modified asphalt and preparation method and application thereof

CN122011505ACN 122011505 ACN122011505 ACN 122011505ACN-122011505-A

Abstract

The invention discloses a road rubber modified asphalt odor removing agent, a preparation method and application thereof, and relates to the technical field of asphalt odor removing agent preparation, wherein the road rubber modified asphalt odor removing agent comprises the following components in percentage by mass: 20% -50% of aluminum hydroxide, 20% -50% of magnesium hydroxide, 15% -30% of micro silicon powder, 5% -15% of plant fruit powder and 0.5% -1% of citric acid powder. The invention achieves the effect of deodorizing the rubber modified asphalt from two angles of chemical neutralization reaction and physical adsorption, adopts targeted chemical reaction, solves the problems of the pungent peculiar smell of the rubber asphalt and the super-discharge of asphalt smoke from the source, and realizes the functions of deodorizing, suppressing smoke, reducing emission and reducing carbon.

Inventors

  • Request for anonymity
  • Request for anonymity
  • ZHAO YONGKUN

Assignees

  • 北京盛德海文生物技术有限公司

Dates

Publication Date
20260512
Application Date
20260210
Priority Date
20250723

Claims (8)

  1. 1. The odor removing agent for the road rubber modified asphalt is characterized by comprising, by mass, 20% -50% of aluminum hydroxide, 20% -50% of magnesium hydroxide, 15% -30% of silica fume, 5% -15% of plant fruit powder and 0.5% -1% of citric acid powder.
  2. 2. The odor removing agent for road rubber modified asphalt of claim 1, wherein the particle size of each of the aluminum hydroxide, the magnesium hydroxide, and the silica fume is 1250 mesh or more.
  3. 3. The odor removing agent for road rubber modified asphalt of claim 1, wherein the particle size of said plant fruit powder is 1250 mesh or more.
  4. 4. The odor removing agent for road rubber modified asphalt of claim 1, wherein said plant fruit powder comprises at least one of mango powder, peach powder, apple powder.
  5. 5. A process for preparing a deodorant for road rubber modified asphalt, applied to the preparation of the deodorant according to any one of claims 1 to 4, comprising the steps of: weighing the components and the proportions of the odor removing agent for the road rubber modified asphalt according to any one of claims 1 to 4; Mixing the aluminum hydroxide, the magnesium hydroxide and the silica fume at the temperature of 5-35 ℃ to obtain a mixed system 1; adding the plant fruit powder into the mixed system 1, and stirring to obtain a mixed system 2; And adding the citric acid powder into the mixed system 2, and stirring to obtain the odor removing agent for the road rubber modified asphalt.
  6. 6. The process according to claim 5, wherein the stirring speed is 20rpm-40rpm, the stirring time is 30-60min, and/or, The stirring speed is 15rpm-25rpm when the plant fruit powder is added into the mixed system 1, the stirring time is 30min-60min, and/or, The stirring speed is 10rpm-20rpm when the citric acid powder is added into the mixed system 2, and the stirring time is 30min-60min.
  7. 7. A method of preparing a road rubber modified asphalt, characterized in that it is prepared with the odor removing agent as defined in any one of claims 1 to 4, comprising: Heating the matrix asphalt to 150-160 ℃ to obtain high-temperature matrix asphalt with good fluidity; When the temperature of the high-temperature matrix asphalt is continuously increased to 160-185 ℃, rubber powder is added, the temperature is controlled to 185-220 ℃, and preliminary modification is carried out for more than or equal to 30 minutes, so that rubber asphalt is obtained; Adding the odor removing agent in any one of claims 1-4 into the rubber asphalt, and carrying out catalytic reaction for 60-90 min to obtain the clean-taste road rubber modified asphalt.
  8. 8. The method according to claim 7, wherein the mass ratio of the matrix asphalt to the rubber powder is (75-80): (20-25), and the addition amount of the odor removing agent is 1% -2% of the mass of the rubber asphalt.

Description

Odor removing agent for road rubber modified asphalt and preparation method and application thereof The application claims the priority of China patent office, application number 202511020280.7, and the application name of "a road rubber modified asphalt deodorant, a preparation method and application thereof", which are filed in 23/07/2025, the entire contents of which are incorporated by reference. Technical Field The invention relates to the technical field of asphalt odor removing agent preparation, in particular to an odor removing agent for road rubber modified asphalt, and a preparation method and application thereof. Background Asphalt is used as an important road construction material and is widely applied to projects such as municipal roads, highways and the like. Because asphalt has the defects of easy flowing at high temperature and brittle failure at low temperature, the asphalt cannot be directly applied when an upper layer and a middle layer of an asphalt road are built, and the asphalt can be applied after the asphalt is subjected to hot working modification and physical indexes such as softening point, penetration, adhesive property, extensibility and aging property of petroleum asphalt are improved. A large amount of harmful volatile matters can be generated in the thermal modification process, and the harmful volatile matters generated in the factory processing process can be collected in a concentrated mode and then subjected to back-end treatment, but the harmful volatile matters can only treat the symptoms, but not the root cause, and the harm to the environment is still not visible. In addition, in the process of preparing the mixture by the processed modified asphalt and paving the construction, because of the spaciousness of a construction site, the smoke cannot be effectively collected for centralized treatment, a large amount of harmful substances can be generated, the body of constructors is directly damaged, and the environment is extremely severely affected. Besides the single SBS modifier is adopted to modify the asphalt, a plurality of asphalt processing enterprises can adopt waste rubber powder to modify the asphalt, and besides a small amount of SBS modifier, a certain amount of rubber powder (generally 15% -25% and even up to 40%) is added into the asphalt to produce the odor-free rubber modified asphalt, so that the cost is reduced, the price of the waste rubber tire powder is less than 1/2 of that of the asphalt, the rutting resistance and the service life of an asphalt highway can be greatly improved by the rubber modified asphalt, and the noise can be reduced and the travelling comfort of the vehicle can be improved. However, the content of 18 polycyclic aromatic hydrocarbons such as naphthalene, anthracene, benzopyrene and the like in the rubber powder of the rubber tire is very high, generally 200-400 mg/kg, even 600-800 mg/kg of individual domestic tires is high, and the content of sulfides and free sulfur is more high than 1.5% -3%. Sulfur in the rubber powder can be decomposed at high temperature to generate sulfur free radicals, the sulfur free radicals react with asphalt at high temperature, hydrogen atoms on polymer chains in the asphalt are extracted, hydrogen sulfide (H2S) is generated by combination, and the sulfur free radicals volatilize in a gas form. Hydrogen sulfide has unpleasant and irritating odors, severely damaging the physical health of workers and the living environment of surrounding residents. However, asphalt contains some toxic and harmful substances, but the road is built, and the recovered waste rubber tire powder contains some toxic and harmful substances, but if not recycled, the waste rubber tire powder causes more pollution to the environment. To change these resources into valuable, it is necessary to perform harmless deodorizing treatment on rubber powder and asphalt. Thus, the odor removal technique and the odor removal effect become important and critical. The pungent odor released by asphalt and rubber under high temperature is difficult to control effectively, the traditional odor removing agent can only mask the odor briefly, odor molecules cannot be removed from the source, and the problem of odor rebound exists. Moreover, most of the traditional odor removing agents rely on physical adsorption or use plant extracts to cover odor, and have low removal efficiency on harmful gases and poor odor removing effect. Disclosure of Invention The invention provides a smell removing agent for road rubber modified asphalt, a preparation method and application thereof, and overcomes the defects of low harmful gas removal rate and poor smell removing effect of the smell removing agent in asphalt in the prior art. The invention provides a smell removing agent for road rubber modified asphalt, which comprises, by mass, 20% -50% of aluminum hydroxide, 20% -50% of magnesium hydroxide, 15% -30% of silica fume, 5% -15% of plant fruit powder and 0.5