CN102190897A - Water-based road asphalt rehabilitating agent and preparation method thereof - Google Patents

Abstract

The invention discloses a water-based road asphalt restoration agent and a preparation method thereof. The formula includes the following components in weight percent: 20-30% of asphalt, 10-20% of water, 5-10% of solvent, and 10-20% of modifier %, emulsifier 0.5~2%, adhesion promoter 0.5~1%, anti-sedimentation agent 0.5~2% and filler 25~40%. The preparation method is as follows: mix water and emulsifier evenly at 55~60°C, add asphalt diluted with solvent and modifier in sequence, emulsify in asphalt emulsification equipment, then add adhesion promoter and anti-sedimentation agent in sequence, Filling, in a high-speed stirred tank, under normal temperature and pressure, continuously stirred at high speed for 15 to 30 minutes, that is, the finished product. The asphalt restorer has good permeability, cohesiveness and durability. It is used to beautify the pavement and repair early diseases such as aging, pockmarked surface and water seepage of the asphalt pavement, and prolong the service life of the road for 2 to 3 years. It has significant economic and social benefits.

Description

A kind of water-based road asphalt restoring agent and preparation method thereof

technical field

The invention relates to a kind of beautifying and repairing asphalt pavement aging, pockmarked surface, tiny cracks, water seepage and other early diseases, which can quickly penetrate the surface layer of asphalt pavement, seal the road surface, control the pockmarked surface, stabilize looseness, bridge small cracks, and achieve water sealing. The invention discloses a road asphalt recovery agent for improving road skid resistance and beautiful pavement appearance and a preparation method thereof, belonging to the related field of asphalt pavement maintenance and repair.

Background technique

As asphalt pavement is more and more widely used in the construction of expressways and urban roads, the common diseases of asphalt pavement such as pavement aging, cracks, pockmarks, looseness, sanding, and water damage are the biggest killers that affect the normal use of roads and shorten the service life. If comprehensive treatment is not carried out in time, road damage will be accelerated, road maintenance costs will be increased, normal road operation will be affected, and major economic losses will be caused. At this time, there is no major damage to the structure of the road surface, and it has little impact on driving. Generally, in this case, the pavement comprehensive quality index is good or above, and the pavement condition index PCI is between 80 and 95. This is the best time to carry out preventive maintenance on the pavement.

Preventive maintenance has the characteristics of convenient construction, short construction period, and good social and economic benefits. There are many preventive maintenance methods, such as fog seal, micro surface, slurry seal and thin layer overlay. This series of technologies has been widely used in the United States, Canada and some European countries, and has achieved great economic and social benefits. Foreign experience shows that taking planned maintenance measures for roads and improving the durability of the road surface can effectively prolong the service life of the road, improve the efficiency of road operation, and give full play to the economic and social benefits of the road itself. Investing 1 yuan in the early stage of the road can save 6-10 yuan in the later stage. However, in domestic promotion and application, technologies such as micro-surfacing, slurry sealing and thin-layer overlay are relatively strict on equipment, construction technology and technical personnel quality. At the same time, after using these technologies, it will also bring a series of problems such as environmental protection, waste disposal, energy waste, resurfacing white lines on traffic roads, and traffic and social economic losses caused by long road closures. At present, environmental protection and high-performance preventive maintenance materials have been studied and applied at home and abroad. Pavement Dressing Conditioner (referred to as PDC, U.S. Patent No. 5,580,603) developed in the United States is a preventive asphalt pavement regeneration agent. too obvious. The development and application of this type of material have also been started in China, but there are no application reports.

In recent years, with the promulgation of relevant national policies, traffic departments at all levels have attached great importance to preventive maintenance of roads, and the market for road preventive maintenance has gradually expanded. Nearly 20% of asphalt pavement in China is in the pre-maintenance stage. It is predicted that the market demand for this type of maintenance material in the last 1-2 years is about 30,000 tons/year, and in the market growth period of 3-5 years, the market demand for this type of material can reach 50,000-100,000 tons/year . It is estimated that in about 10 years, the total market demand of this project will be about 300,000 tons/year, and the total market value will reach 12 billion yuan.

With the domestic environmental protection gradually heating up, and the society and the public's demand for road traffic is getting higher and higher, the preventive maintenance market of high-grade highways and urban roads proposes functions such as adhesion performance, durability, and beautification and repair of preventive maintenance materials. higher requirements. However, low-grade asphalt pavement preventive maintenance materials represented by emulsified asphalt and modified emulsified asphalt still account for a large proportion in the domestic market, while high-performance and environmentally friendly asphalt restoration materials are blank.

Contents of the invention

According to the trend of asphalt road maintenance toward environment-friendly development and the shortcomings of existing pre-maintenance materials in the market, the present invention aims to provide a water-based road asphalt restoration agent and a preparation method thereof, which are used to beautify the appearance of the road surface and improve road resistance. Sliding ability and waterproof performance, solve the early diseases of asphalt pavement such as asphalt aging, looseness, pitting, small cracks, water seepage, etc., and prevent or curb the development and spread of diseases, thereby prolonging the life of the road.

The purpose of the present invention is achieved through the following technical solutions:

A water-based road asphalt restoring agent is characterized in that it is composed of the following components in terms of weight percentage: 20-30% of asphalt, 10-20% of water, 5-10% of solvent, 10-20% of modifier, emulsified Agent 0.5~2%, adhesion promoter 0.5~1%, anti-sedimentation agent 0.5~2% and filler 25~40%.

The asphalt is any one of AH-70 petroleum asphalt and SBS modified asphalt.

Described water is ion-free distilled water.

The solvent is any one of ethyl acetate, butyl acetate, acetone, ethanol, butanol or a mixture of more than one.

The modifier is any one of SBR latex, SBS latex, EBS latex, neoprene latex, EVA emulsion, pure acrylic emulsion, silicon acrylic emulsion or a mixture of more than one.

The emulsifier is a cationic asphalt emulsifier.

The adhesion promoter is any one or a mixture of silane coupling agent DN-630, silane coupling agent A-1100, silane coupling agent A-171, and silane coupling agent KH560.

The anti-sedimentation agent is any one or a mixture of fumed silica, organic bentonite, and montmorillonite.

The filler is any one or a mixture of calcined kaolin, clay, talcum powder and calcium carbonate.

The preparation method of described water-based road asphalt restoration agent, comprises the following steps:

(1) Mix water and emulsifier evenly at 55~60°C;

(2) Dilute the asphalt with a solvent;

(3) Add the liquid prepared in step (2) and the modifier to the mixture in step (1) in sequence;

(4) Emulsify the mixture in step (3) in asphalt emulsification equipment;

(5) Add adhesion promoter, anti-sedimentation agent, and filler to the emulsion prepared in step (4) in sequence, and stir continuously at high speed for 15 to 30 minutes in a high-speed stirring tank under normal temperature and pressure, and the finished product is obtained.

The present invention can significantly improve the emulsification efficiency and effect of asphalt by first diluting asphalt with a solvent and then emulsifying, and at the same time introducing modifiers, adhesion promoters and other substances with special structures can significantly enhance the storage stability, bonding performance and permeability of the product And durability, greatly improving the added value of the product.

Compared with prior art, the advantage of the technical invention:

(1) The water-based road asphalt restoration agent of the present invention is a water-soluble black concentrated solution that can be applied at room temperature. It can be sprayed on the road surface manually or mechanically in non-rainy days, and can beautify and repair highway or municipal road asphalt pavement.

(2) After the material of the present invention is applied to the asphalt pavement, it can be adsorbed on the road surface and quickly penetrate into the surface layer of the asphalt pavement to improve the road surface structure (friction pendulum value, structural depth) and improve the waterproof performance of the road surface.

(3) The material of the present invention has excellent permeability and adhesion performance, which solves the problems of poor permeability and adhesion of emulsified asphalt. After the asphalt pavement is applied, the penetration depth of the material to the surface can reach 3~10mm.

(4) The water-based road asphalt restoration agent of the present invention has a simple preparation process, low equipment requirements, low use cost, simple construction process, and environmental protection of resources, and is widely applicable to beautifying the appearance of asphalt pavement of cities and high-grade highways, improving the quality of pavement, and prolonging the service life of roads 2~3 years, with considerable economic and social benefits.

Detailed ways

In order to better understand the present invention, the inventive water-based road asphalt restoration agent and its preparation method will be described in detail below through Examples 1-4. The raw materials used in Examples 1-4 are all industrial grades.

Example 1

Take AH-70 petroleum asphalt (model SK70#) 300g, water 150g, ethyl acetate 30g, ethanol 20g, SBR latex 40g, EVA emulsion 150g, French Rhodia asphalt emulsifier DVAP BIT AM-90 (slow cracking and fast setting Type quaternary ammonium salt cationic asphalt emulsifier) 20g, DN-630 silane coupling agent 5g, fumed silica 10g and calcined kaolin (250 mesh) 275g.

The preparation method is as follows: mix 150g water and 20g DVAP BIT AM-90 at 55~60℃; dilute 300g SK70# petroleum asphalt with 30g ethyl acetate and 20g ethanol; dilute 350g asphalt solution, 40g SBR latex , 150g of EVA emulsion is added to the prepared 170g of emulsifier aqueous solution in turn, emulsified in asphalt emulsification equipment, and then added in turn with 5g of DN-630 silane coupling agent, 10g of fumed silica and 275g of calcined kaolin, in a high-speed stirring tank , Stir continuously at high speed for 15-30 minutes at normal temperature and pressure, and the finished product is obtained.

The finished product is painted on the asphalt pavement in an amount of 0.3kg/m ² , surface-dried at 25°C and relative humidity 60% for 1 hour, and hard-dried for 4 hours. The wet film is bright black and the dry film is matte black. The Chongqing-Guizhou Expressway was used as the physical project for the test, and the tracking and testing data are shown in Table 1.

Table 1 Tracking table of inspection data of Chongqing Yuqian Expressway before construction and 1, 3, and 6 months after construction

According to the engineering application effect, this product can improve the anti-skid ability of the road, seal the road surface, and effectively improve the appearance of the road surface. It is suitable for preventive maintenance of urban roads and high-grade highway asphalt pavement.

Example 2

SBR latex is replaced by SBS latex among the embodiment 1, all the other remain unchanged, and effect is similar to embodiment 1.

Example 3

In embodiment 1, SBR latex is replaced by EBS latex, all the other remain unchanged, and the effect is similar to that of embodiment 1.

Example 4

In embodiment 1, SBR latex is replaced by chloroprene latex, all the other remain unchanged, and effect is similar to embodiment 1.

Example 5

Take 200g of SBS modified asphalt (model PG76-22, produced by Shell Company of the United States), 120g of water, 50g of butyl acetate, 20g of acetone, 175g of silicon acrylic emulsion, French Rhodia asphalt emulsifier DVAP BIT AM-92 (cation slow cracking Medium setting asphalt emulsifier) 10g, A-1100 silane coupling agent 10g, montmorillonite 15g and talcum powder (250 mesh) 400g.

The preparation method is as follows: mix 120g water and 10g DVAP BIT AM-90 at 55~60℃; dilute 200g PG76-22SBS modified asphalt with 50g butyl acetate and 20g acetone; dilute 270g asphalt solution, 175g Add the silicon-acrylic emulsion to the prepared 130g emulsifier aqueous solution in turn, emulsify in the asphalt emulsification equipment, then add 10g A-1100 silane coupling agent, 15g montmorillonite and 400g talcum powder in turn, in a high-speed stirring tank, at room temperature Stir continuously at high speed for 15-30 minutes under normal pressure, that is the finished product.

The finished product is painted on the asphalt pavement in an amount of 0.3kg/m ² , surface-dried at 25°C and relative humidity 60% for 1 hour, and hard-dried for 4 hours. The wet film is bright black and the dry film is matte black. The Guangzhou-Zhuhai section of the Beijing-Zhuhai Expressway was used as the physical project for the test, and the tracking and testing data are shown in Table 2.

Table 2 Tracking table of inspection data of Beijing-Zhuhai Expressway before construction and 1, 3, and 6 months after construction

According to the engineering application effect, this product can improve the anti-skid ability of the road, seal the road surface, and effectively improve the appearance of the road surface. It is suitable for the preventive maintenance of the asphalt pavement of high-grade highways and the waterproof treatment of the bridge surface.

Example 6

The silicone-acrylic emulsion in Example 5 was replaced by pure acrylic emulsion, the talcum powder was replaced by clay, and the rest remained unchanged, and the effect was similar to that of Example 5.

Example 7

Take 250g of SBS modified asphalt (model PG76-22, produced by Shell Company of the United States), 150g of water, 50g of butyl acetate, 50g of butanol, 100g of EVA emulsion, French Rhodia asphalt emulsifier DVAP BIT AM-99 (cation slow cracking Slow setting asphalt emulsifier) 5g, A-171 silane coupling agent 5g, montmorillonite 20g and calcium carbonate (250 mesh) 370g.

Its preparation method is as follows: mix 150g of water and 5g of DVAP BIT AM-92 at 55~60℃, adjust the pH value to 2~3; dilute 250g of PG76-22SBS modified asphalt with 50g of butyl acetate and 50g of butanol; Add 350g of diluted asphalt solution and 100g of EVA emulsion to the prepared 155g of emulsifier aqueous solution in sequence, emulsify in asphalt emulsification equipment, then add 5g of A-171 silane coupling agent, 20g of montmorillonite and 370g of calcium carbonate in sequence (250 mesh), in a high-speed stirring tank, under normal temperature and pressure, continuous high-speed stirring for 15-30 minutes, that is, the finished product.

The finished product is painted on the asphalt pavement in an amount of 0.3kg/m ² , surface-dried at 25°C and relative humidity 60% for 1 hour, and hard-dried for 4 hours. The wet film is bright black and the dry film is matte black. Taking Chongqing Jingkai Avenue as the physical project for the test, the tracking and testing data are shown in Table 3.

Table 3 Tracking table of inspection data of Chongqing Jingkai Avenue before construction and 1, 3, and 6 months after construction

According to the engineering application effect, this product can improve the anti-skid ability of the road, seal the road surface, and effectively improve the appearance of the road surface. It is suitable for the preventive maintenance of urban roads and high-grade highway asphalt pavement.

Example 8

The montmorillonite in Example 7 was replaced by organobentonite, the A-171 silane coupling agent was replaced by KH560 silane coupling agent, the rest remained unchanged, and the application effect was similar to that of Example 7.

Claims (10)

1. A water-based road asphalt recovery agent, characterized in that it is composed of the following components in weight percentage: 20-30% asphalt, 10-20% water, 5-10% solvent, and 10-20% modifier , emulsifier 0.5~2%, adhesion promoter 0.5~1%, anti-sedimentation agent 0.5~2% and filler 25~40%. 2. The water-based road asphalt restoring agent according to claim 1, characterized in that: the asphalt is any one of AH-70 petroleum asphalt and SBS modified asphalt. 3. The water-based road asphalt restoring agent according to claim 1, characterized in that: said water is ion-free distilled water. 4. The water-based road asphalt restoring agent according to claim 1, characterized in that: the solvent is any one of ethyl acetate, butyl acetate, acetone, ethanol, butanol or a mixture of more than one. 5. The water-based road asphalt recovery agent according to claim 1, characterized in that: the modifier is SBR latex, SBS latex, EBS latex, neoprene latex, EVA emulsion, pure acrylic emulsion, silicone acrylic emulsion any one or a mixture of more than one. 6. The water-based road asphalt restoration agent according to claim 1, characterized in that: the emulsifier is a cationic asphalt emulsifier. 7. The water-based road asphalt restoring agent according to claim 1, characterized in that: the adhesion promoter is silane coupling agent DN-630, silane coupling agent A-1100, silane coupling agent A-171 , Silane coupling agent KH560 any one or a mixture of more than one. 8. The water-based road asphalt restoring agent according to claim 1, characterized in that: the anti-sedimentation agent is any one or a mixture of fumed silica, organic bentonite, and montmorillonite. 9. The water-based road asphalt restoration agent according to claim 1, characterized in that: the filler is any one or a mixture of calcined kaolin, clay, talcum powder and calcium carbonate. 10. prepare the preparation method of any one of claim 1-9 water-based road asphalt recovery agent, comprise the following steps: (1) Mix water and emulsifier evenly at 55~60°C; (2) Dilute the asphalt with a solvent; (3) Add the liquid prepared in step (2) and the modifier to the mixture in step (1) in sequence; (4) Emulsify the mixture in step (3) in asphalt emulsification equipment; (5) Add adhesion promoter, anti-sedimentation agent, and filler to the emulsion prepared in step (4) in sequence, and stir continuously at high speed for 15 to 30 minutes at normal temperature and pressure in a high-speed stirring tank to obtain the finished product.