A coumarone resin modified water-based asphalt emulsion, and a preparation method and application thereof

Abstract

This invention discloses a coumarone resin-modified waterborne asphalt emulsion, its preparation method, and its application, belonging to the field of asphalt composite material technology. A resin emulsion is prepared by emulsifying coumarone resin with a softening point of 70-80℃ using an anionic / nonionic compound emulsifier. Then, a base asphalt of No. 70 is emulsified separately to obtain an asphalt emulsion. Finally, the two emulsions are blended at room temperature and low speed to obtain a modified composite emulsion (coumarone resin-modified waterborne asphalt emulsion). This invention effectively improves the stability of the system through a stepwise emulsification process. Coumarone resin significantly improves coating adhesion, hardness, water resistance, and weather resistance. The resulting composite emulsion can be widely used in waterborne asphalt anticorrosive paints and geogrid surface coatings, exhibiting dense film formation, good workability, and strong durability. The preparation process is simple and suitable for industrial production.

Description

Technical Field

[0001] This invention belongs to the field of asphalt composite material technology, and relates to a coumarone resin modified waterborne asphalt emulsion, and more particularly to a modified asphalt emulsion prepared by a stepwise emulsification and post-blending process, and its application in waterborne asphalt paint and geogrid coating. Background Technology

[0002] Water-based asphalt emulsions are environmentally friendly, easy to apply, and low-cost, making them widely used in anti-corrosion coatings, waterproof coatings, and geotextile surface treatment. However, traditional single-component water-based asphalt emulsions generally suffer from problems such as soft film formation, surface tackiness, insufficient adhesion to substrates, and poor water and weather resistance. These issues make it difficult to meet the long-term anti-corrosion requirements of water-based asphalt anti-corrosion paints, and also fail to meet the standards for bonding strength, soil corrosion resistance, and aging resistance of geogrid coatings.

[0003] While there are existing reports on the use of resin to modify asphalt, most of these methods involve a one-time emulsification process after high-temperature melting and blending of the resin and asphalt. This method is prone to problems such as poor compatibility between resin and asphalt, wide emulsion particle size distribution, poor system stability, and easy delamination and demulsification during storage. At the same time, the improvement in film toughness and adhesion is limited, making it difficult to balance workability and durability.

[0004] Therefore, developing a modified waterborne asphalt emulsion with high stability, excellent comprehensive performance, and applicability to both waterborne asphalt paint and geogrid coating has significant engineering application value. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, this invention provides a coumarone resin-modified waterborne asphalt emulsion and its preparation method. By emulsifying coumarone resin and No. 70 asphalt separately, and then blending and modifying them, combined with anionic and nonionic compound emulsification system, the stability, film-forming properties, adhesion and weather resistance of the emulsion are significantly improved, so that it can simultaneously meet the application requirements of waterborne asphalt paint and geogrid coating.

[0006] This invention is achieved through the following technical solution:

[0007] A method for preparing a coumarone resin-modified aqueous asphalt emulsion includes the following steps:

[0008] Coumarone resin with a softening point of 70-80℃ is heated and melted, and then emulsified under the action of anionic and nonionic compound emulsifiers to prepare coumarone resin emulsion.

[0009] 70 base asphalt was heated, melted, and emulsified to prepare 70 water-based asphalt emulsion.

[0010] The coumarone resin emulsion and the No. 70 waterborne asphalt emulsion were mixed evenly at low speed under normal temperature to obtain a coumarone resin modified waterborne asphalt composite emulsion. The mixing process was carried out by low-speed stirring to avoid emulsion demulsification and stratification caused by high shear force.

[0011] Furthermore, the anionic and nonionic compound emulsifier is a compound of anionic and nonionic emulsifiers to ensure emulsification efficiency and emulsion stability.

[0012] Furthermore, the anionic emulsifier includes sulfonic acid, 2A1, and fast T, and the nonionic emulsifier includes OP-10. The mass ratio of the sulfonic acid, 2A1, fast T, and OP-10 is (4-6):(2-4):(0.8-1.2):(0.8-1.2). The anionic and nonionic compound emulsifier prepared with this mass ratio has the characteristics of good emulsification effect and good stability.

[0013] Furthermore, the mass ratio of the coumarone resin to the anionic nonionic compound emulsifier is 100:(3-4), and the mass ratio can be selected according to actual needs to adjust the softness and hardness effect.

[0014] Furthermore, the mass ratio of the coumarone resin emulsion to the No. 70 water-based asphalt emulsion is 1:(2-3), and the mass ratio can be selected according to actual needs to adjust the softness and hardness effect.

[0015] A coumarone resin-modified waterborne asphalt emulsion, prepared by the aforementioned preparation method, is used to prepare waterborne asphalt paint and as a surface coating material for geogrids.

[0016] As can be seen from the above technical solution, the beneficial effects of the coumarone resin-modified waterborne asphalt emulsion, its preparation method, and its application provided by the present invention are as follows:

[0017] (1) The step-by-step emulsification and post-mixing process is adopted to avoid the problems of poor compatibility, uneven particle size and easy demulsification caused by direct blending of coumarone resin and asphalt, and significantly improves the storage stability of the emulsion.

[0018] (2) Coumarone resin with a softening point of 70-80℃ is well compatible with No. 70 asphalt, which can effectively improve the coating cohesion, adhesion and surface hardness, form a dense film that does not stick or crack, and has outstanding water resistance and alkali resistance.

[0019] (3) The anionic and nonionic compound emulsion system is fully emulsified, the emulsion particles are fine and uniform, and the leveling properties are good. It can be applied to various construction methods such as brushing, spraying and dipping.

[0020] (4) The product is highly versatile. It can be used to prepare water-based asphalt anti-corrosion paint or directly as a coating liquid for geogrid surfaces to enhance the bonding performance between the geogrid and the soil and asphalt layer and extend the service life of the project.

[0021] (5) The preparation process is simple, the conditions are mild and easy to control, and it is suitable for continuous industrial production. Detailed Implementation

[0022] The embodiments of the technical solution of the present invention will be described in detail below. These embodiments are only used to illustrate the technical solution of the present invention more clearly, and are therefore merely examples and should not be used to limit the scope of protection of the present invention.

[0023] Example 1

[0024] A method for preparing a coumarone resin-modified aqueous asphalt emulsion includes the following steps:

[0025] Step 1: Preparation of coumarone resin emulsion: Coumarone resin with a softening point of 70-80℃ is heated to complete melting, an anionic nonionic compound emulsifier is added, and the mixture is emulsified and dispersed under stirring and shearing. After cooling to room temperature, a stable coumarone resin emulsion is obtained. The anionic nonionic compound emulsifier is composed of sulfonic acid, 2A1, fast T, and OP-10 in a mass ratio of 4:2:0.8:0.8, and the mass ratio of coumarone resin to the anionic nonionic compound emulsifier is 100:3.

[0026] Step 2: Preparation of asphalt emulsion: Select No. 70 road asphalt, heat and melt it, and use an emulsification system that matches the resin emulsification to emulsify it, so as to obtain No. 70 water-based asphalt emulsion. The emulsification system is a commonly used anionic system and belongs to existing materials.

[0027] Step 3: Blending to prepare composite emulsion: Add coumarone resin emulsion and No. 70 waterborne asphalt emulsion to a mixing vessel at a mass ratio of 1:2, and stir at low speed (30-70 rpm) at room temperature for 30 minutes until the mixture is uniform to obtain coumarone resin modified waterborne asphalt composite emulsion.

[0028] Example 2

[0029] A method for preparing a coumarone resin-modified aqueous asphalt emulsion differs from Example 1 in that:

[0030] The anionic nonionic compound emulsifier is compounded from sulfonic acid, 2A1, fast T and OP-10 in a mass ratio of 5:3:1:1, and the mass ratio of coumarone resin to the anionic nonionic compound emulsifier is 100:3.

[0031] The mass ratio of the coumarone resin emulsion to the No. 70 waterborne asphalt emulsion is 1:2.

[0032] Example 3

[0033] A method for preparing a coumarone resin-modified aqueous asphalt emulsion, which differs from Example 1 or 2 in that:

[0034] The anionic nonionic compound emulsifier is compounded from sulfonic acid, 2A1, fast T and OP-10 in a mass ratio of 6:4:1.2:1.2, and the mass ratio of coumarone resin to anionic nonionic compound emulsifier is 100:4.

[0035] The mass ratio of the coumarone resin emulsion to the No. 70 waterborne asphalt emulsion is 1:3.

[0036] It should be noted that the coumarone resin with a softening point of 70-80°C is an existing product, such as the BN70 product produced by Dongguang County Bonnie Chemical Co., Ltd.

[0037] The chemical name of the sulfonic acid is dodecylbenzenesulfonic acid, which belongs to the sulfonate type of anionic surfactant. This substance is soluble in water and has emulsifying, dispersing, and detergency effects.

[0038] The chemical name of 2A1 is sodium dodecyl diphenyl ether disulfonate, a high-performance anionic surfactant produced by Dow Chemical Company in the United States. This product has the characteristics of strong adsorption capacity, large dispersing power and strong bonding power, and exhibits excellent stability under strong acid, strong alkali, salt solution and high shear conditions.

[0039] The chemical name of Fast T is sodium di-2-octyl maleate sulfonate (also known as Fast Penetrant T). It is an anionic surfactant with characteristics such as rapid and uniform penetration, as well as good wetting, emulsifying and foaming properties. In the emulsifier compound system, Fast T mainly plays the role of penetration and auxiliary emulsification.

[0040] The chemical name of OP-10 is alkylphenol polyoxyethylene ether, which is a nonionic surfactant that is easily soluble in water. It has excellent leveling, emulsifying, wetting, diffusion and antistatic properties. It is resistant to acids, alkalis and hard water and can be mixed with various surfactants. In emulsifier compounding systems, OP-10, as a nonionic component, works synergistically with anionic emulsifiers to enhance the stability and electrolyte resistance of the emulsion.

[0041] A coumarone resin-modified waterborne asphalt emulsion was prepared by the above preparation method. The modified waterborne asphalt emulsion has a uniform appearance, no sedimentation, no stratification, no flocculation, excellent storage stability, a black and dense film, excellent adhesion, good water resistance and weather resistance, and can be directly used in the production of waterborne asphalt paint and the dip coating construction of geogrid surface coating.

[0042] It should be noted that no fillers, defoamers, thickeners, or stabilizers are added during the preparation of the coumarone resin-modified waterborne asphalt emulsion, allowing for a certain concentration gradient during storage. This is intended to prevent any impact on downstream customers when compounding products, and downstream customers can compound products according to their actual needs.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for preparing a coumarone resin-modified waterborne asphalt emulsion, characterized in that, Includes the following steps: S1. Preparation of coumarone resin emulsion: Coumarone resin with a softening point of 70-80℃ is heated and melted, and emulsified under the action of anionic nonionic compound emulsifier to prepare coumarone resin emulsion. S2. Preparation of asphalt emulsion: Heat and melt No. 70 base asphalt and emulsify it to prepare No. 70 water-based asphalt emulsion; S3. Preparation of composite emulsion by blending: The coumarone resin emulsion described in step S1 and the No. 70 waterborne asphalt emulsion described in step S2 are mixed evenly by low-speed stirring at room temperature to obtain a coumarone resin modified waterborne asphalt composite emulsion.

2. The preparation method according to claim 1, characterized in that: The anionic and nonionic compound emulsifier is a compound of anionic and nonionic emulsifiers.

3. The preparation method according to claim 2, characterized in that: The anionic emulsifier includes sulfonic acid, 2A1, and fast T, and the nonionic emulsifier includes OP-10.

4. The preparation method according to claim 3, characterized in that: The mass ratio of the sulfonic acid, the 2A1, the fast T and the OP-10 is (4-6):(2-4):(0.8-1.2):(0.8-1.2).

5. The preparation method according to claim 1, characterized in that: In step S1, the mass ratio of the coumarone resin to the anionic nonionic compound emulsifier is 100:(3-4).

6. The preparation method according to claim 1, characterized in that: In step S2, the mass ratio of the coumarone resin emulsion to the No. 70 waterborne asphalt emulsion is 1:(2-3).

7. A coumarone resin-modified waterborne asphalt emulsion, characterized in that: It is prepared by the preparation method described in any one of claims 1 to 6.

8. The coumarone resin-modified aqueous asphalt emulsion according to claim 7, characterized in that: This emulsion is used to prepare water-based asphalt paint.

9. The coumarone resin-modified aqueous asphalt emulsion according to claim 7, characterized in that: This emulsion is used as a surface coating material for geogrids.