阅读说明：本技术 一种油性沥青混合料温拌改性剂及其制备方法 (Warm-mixing modifier for oily asphalt mixture and preparation method of warm-mixing modifier ) 是由 黄绍龙 肖铭钊 沈凡 卢吉 方四发 黄修林 匡罗飞 储昭胜 于 2019-08-23 设计创作，主要内容包括：本发明公开了一种油性沥青混合料温拌改性剂,按重量分数计,包括如下原料：树脂100份,表面活性剂5～10份,松节油乳液30～50份；所述表面活性剂的原料包括妥尔油、浓硫酸、精氨酸,且摩尔比依次为10：7～9：2～4；所述松节油乳液的原料按重量分数计包括松节油10份,醋酸1～2份；本发明还提供了油性沥青混合料温拌改性剂的制备方法以及包含所述温拌改性剂的油性沥青温补料。本发明的油性沥青混合料温拌改性剂引进了氨基基团,从而提高了沥青水混合料的水稳定性,提高沥青与集料的粘附性。(The invention discloses a warm-mixing modifier for an oily asphalt mixture, which comprises the following raw materials in parts by weight: 100 parts of resin, 5-10 parts of surfactant and 30-50 parts of turpentine oil emulsion; the raw materials of the surfactant comprise tall oil, concentrated sulfuric acid and arginine, and the molar ratio is 10: 7-9: 2-4; the turpentine oil emulsion comprises, by weight, 10 parts of turpentine and 1-2 parts of acetic acid; the invention also provides a preparation method of the warm-mix modifier for the oily asphalt mixture and an oily asphalt warm-mix material containing the warm-mix modifier. The warm-mixing modifier for the oily asphalt mixture introduces amino groups, thereby improving the water stability of the asphalt-water mixture and improving the adhesion of asphalt and aggregate.)

1. The warm mixing modifier for the oily asphalt mixture is characterized by comprising the following raw materials in parts by weight: 100 parts of resin, 5-10 parts of surfactant and 30-50 parts of turpentine oil emulsion; the raw materials of the surfactant comprise tall oil, concentrated sulfuric acid and arginine, and the molar ratio is 10: 7-9: 2-4; the turpentine oil emulsion comprises, by weight, 10 parts of turpentine and 1-2 parts of acetic acid.

2. The warm mix modifier of oily asphalt mixture according to claim 1, wherein said tall oil has a fatty acid content of > 38% and an iodine value of < 120; the concentration of the concentrated sulfuric acid is more than 98 percent.

3. The warm mix modifier for oily asphalt mixture according to claim 1, wherein the pinene content of the turpentine is more than 80%, and the acid ester is less than or equal to 1.0 mg/g; the mass content of acetic acid in the acetic acid is 30-35%.

4. The warm-mix modifier for oily asphalt mixture according to claim 1, wherein said resin is one of rosin resin, C9 petroleum resin and terpene resin.

5. A preparation method of the warm mix modifier for the oily asphalt mixture as claimed in any one of claims 1 to 4, characterized by comprising the following steps:

step 1, mixing tall oil, concentrated sulfuric acid and arginine according to a molar ratio of 10: 7-9: 2-4, putting tall oil into a reactor, and dripping the concentrated sulfuric acid while stirring to obtain an intermediate product; putting the intermediate product into a reactor, adding the arginine, uniformly mixing, titrating alkali while stirring until the pH value of the solution is between 8.5 and 9.5, and stopping titration to obtain a surfactant;

step 2, mixing turpentine and acetic acid according to the weight ratio of 10: 1-2, stirring and mixing to obtain a turpentine oil emulsion;

and 3, mixing 100 parts of resin, 5-10 parts of surfactant and 30-50 parts of turpentine oil emulsion, transferring the mixture into a reactor, shearing and stirring, and cooling to room temperature to obtain the warm mixing modifier for the oily asphalt mixture.

6. The preparation method according to claim 5, wherein in the step 1, the reaction temperature of the tall oil when concentrated sulfuric acid is dripped into the tall oil is 35-45 ℃, the stirring speed of the concentrated sulfuric acid when the concentrated sulfuric acid is dripped into the tall oil is 300-500 r/min, and the titration time is 0.5-1 h; the reaction temperature during alkali titration is 25-30 ℃, and the stirring speed during alkali titration is 200-400 r/min.

7. The method of claim 5, wherein the base used for titration in step 1 is one of ammonia, sodium hydroxide and triethanolamine.

8. The preparation method according to claim 5, wherein the temperature during the shearing and stirring in the step 3 is 80-100 ℃, the shearing and stirring speed is 800-1000 r/min, and the shearing and stirring time is 0.5-1 h.

9. The oily asphalt warm-patch material is characterized by comprising the following raw materials in parts by weight: 90-95 parts of aggregate, 6-8 parts of filler and 2-3 parts of warm-patch asphalt; the warm-patch asphalt comprises 73-80 parts by weight of asphalt, 18-24 parts by weight of diesel oil and 2-3 parts by weight of the oily asphalt mixture warm-mix modifier in any one of claims 1-4.

10. A method for preparing the oily asphalt warm-patch material according to claim 9, which is characterized by comprising the following steps:

step 1, heating 73-80 parts of asphalt to 100-140 ℃, and then stirring and mixing with 18-24 parts of diesel oil and 2-3 parts of oily asphalt mixture warm-mixing modifier to obtain warm-patch asphalt;

step 2, heating 2-3 parts of the warm-patch asphalt obtained in the step 1 to 60-80 ℃, then heating 90-95 parts of the aggregate to 70-80 ℃, and then mixing 6-8 parts of the filler, the heated warm-patch asphalt and the heated aggregate to obtain the oily asphalt warm-patch material; the stirring time is more than or equal to 25 seconds during the mixing, and the discharging temperature is not more than 80 ℃.

Technical Field

The invention relates to the technical field of road engineering materials, in particular to a warm mixing modifier for an oily asphalt mixture and a preparation method thereof.

Background

With the increasingly prominent global environmental problem in recent years, environmental protection and energy conservation have become the base points for the development of various industries. In road construction, the laying of asphalt pavements requires the consumption of a large amount of energy and the release of pollution gas due to the need of heating to a specific temperature, and has a significant threat to the environment and operators. The warm-mixed asphalt mixture can well relieve a plurality of problems caused by high-temperature mixing of the warm-mixed asphalt mixture: (1) and the emission of harmful gases at high temperature. According to the detection report of foreign countries, the carbon dioxide CO can be generated by changing the hot mixing of the asphalt mixture into the warm mixing₂The emission is reduced by about 1/2, the emission of carbon monoxide CO is reduced by about 2/3, and sulfur dioxide SO is reduced₂Emission reduction of 40%, nitrogen oxide NO_XThe class is reduced by nearly 60 percent, and the environmental protection benefit of the material warm-mixed asphalt mixture technology is very obvious; (2) the energy consumption problem reports that the adoption of the warm-mixed asphalt mixture can reduce the fuel consumption by more than 30 percent; (3) asphalt aging caused by high-temperature construction. The mixing and paving temperature of the hot-mixed asphalt mixture is quite high, and the aging of the asphalt is difficult to avoid; the warm mixing agent is a novel material, can correspondingly reduce the mixing and rolling temperature of the asphalt mixture by more than 30 ℃ to 40 ℃ compared with the same hot-mixed asphalt mixture, and has good application prospect.

The existing warm-mixing agent for asphalt mixture mainly comprises microcrystalline wax, zeolite and surfactant, wherein the surfactant has the best effect. Surfactant products have the disadvantage that they are present in the form of emulsions which can carry water into the bituminous mixture, thus additionally reducing the water stability of the bituminous mixture, resulting in low adhesion of bitumen to the aggregates and great inconvenience to the construction.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides the warm mixing modifier for the oily asphalt mixture, which introduces amino groups, thereby improving the water stability of the asphalt-water mixture and improving the adhesion of asphalt and aggregate.

The invention is realized by the following steps:

the invention aims to provide a warm mixing modifier for an oily asphalt mixture, which comprises the following raw materials in parts by weight: 100 parts of resin, 5-10 parts of surfactant and 30-50 parts of turpentine oil emulsion; the raw materials of the surfactant comprise tall oil, concentrated sulfuric acid and arginine, and the molar ratio is 10: 7-9: 2-4; the turpentine oil emulsion comprises, by weight, 10 parts of turpentine and 1-2 parts of acetic acid.

Preferably, the tall oil has a fatty acid content of > 38% and an iodine value of < 120; the concentration of the concentrated sulfuric acid is more than 98 percent.

Preferably, the pinene content of the turpentine is more than 80%, and the acid ester is less than or equal to 1.0 mg/g; the mass content of acetic acid in the acetic acid is 30-35%.

Preferably, the resin is one of rosin resin, C9 petroleum resin, and terpene resin.

The second purpose of the invention is to provide a preparation method of the warm mixing modifier for the oily asphalt mixture, which comprises the following steps:

step 1, mixing tall oil, concentrated sulfuric acid and arginine according to a molar ratio of 10: 7-9: 2-4, putting tall oil into a reactor, and dripping the concentrated sulfuric acid while stirring to obtain an intermediate product; putting the intermediate product into a reactor, adding the arginine, uniformly mixing, titrating alkali while stirring until the pH value of the solution is between 8.5 and 9.5, and stopping titration to obtain a surfactant;

step 2, mixing turpentine and acetic acid according to the weight ratio of 10: 1-2, stirring and mixing to obtain a turpentine oil emulsion;

and 3, mixing 100 parts of resin, 5-10 parts of surfactant and 30-50 parts of turpentine oil emulsion, transferring the mixture into a reactor, shearing and stirring, and cooling to room temperature to obtain the warm mixing modifier for the oily asphalt mixture.

Preferably, in the step 1, the reaction temperature of the tall oil when the concentrated sulfuric acid is dripped is 35-45 ℃, the stirring speed when the concentrated sulfuric acid is dripped is 300-500 r/min, and the titration time is 0.5-1 h; the reaction temperature during alkali titration is 25-30 ℃, and the stirring speed during alkali titration is 200-400 r/min.

Preferably, the base used for titration in the step 1 is one of ammonia water, sodium hydroxide and triethanolamine.

Preferably, the temperature during shearing and stirring in the step 3 is 80-100 ℃, the shearing and stirring speed is 800-1000 r/min, and the shearing and stirring time is 0.5-1 h.

The invention also aims to provide an oily asphalt temperature compensation material which comprises the following raw materials in parts by weight: 90-95 parts of aggregate, 6-8 parts of filler and 2-3 parts of warm-patch asphalt; the warm-patch asphalt comprises, by weight, 73-80 parts of asphalt, 18-24 parts of diesel oil and 2-3 parts of warm-mix modifier for the oily asphalt mixture.

The fourth purpose of the invention is to provide a preparation method of the oily asphalt temperature compensation material, which comprises the following steps:

step 1, heating 73-80 parts of asphalt to 100-140 ℃, and then stirring and mixing with 18-24 parts of diesel oil and 2-3 parts of oily asphalt mixture warm-mixing modifier to obtain warm-patch asphalt;

step 2, heating 2-3 parts of the warm-patch asphalt obtained in the step 1 to 60-80 ℃, then heating 90-95 parts of the aggregate to 70-80 ℃, and then mixing 6-8 parts of the filler, the heated warm-patch asphalt and the heated aggregate to obtain the oily asphalt warm-patch material; the stirring time is more than or equal to 25 seconds during the mixing, and the discharging temperature is not more than 80 ℃.

Compared with the prior art, the invention has the following advantages and effects:

the warm mixing modifier for the oily asphalt mixture can form tiny micelles, plays a role in lubricating in the mixing and rolling processes, and reduces the construction temperature (by 30-60 ℃); the raw materials of the surfactant comprise tall oil, concentrated sulfuric acid and arginine, an amino group is introduced, the water stability of the asphalt-water mixture is improved, and the adhesion of asphalt and aggregate is improved, so that the asphalt and the aggregate are prevented from being peeled.

Detailed Description