Emulsified asphalt type asphalt grouting material modified by rare earth tailings and application of emulsified asphalt type asphalt grouting material

Abstract

The invention relates to the technical field of waterproof coatings, in particular to a rare earth tailing modified emulsified asphalt type asphalt grouting material and application thereof. The asphalt grouting material comprises a modified emulsified asphalt composition, and the modified emulsified asphalt composition comprises asphalt and a modified component, the modified component comprises SBR emulsion, rare earth tailings and a coupling agent; the modified asphalt is prepared from the following components in parts by weight: 300 to 1200 parts of asphalt, 75 to 250 parts of SBR (Styrene Butadiene Rubber) emulsion and 3 to 24 parts of rare earth tailings. According to the invention, the rare earth tailings are adopted to modify the emulsified asphalt, and the obtained modified emulsified asphalt can be better deposited on an interface in a demulsification stage, has higher interface adhesion and water resistance, and has important application value in the field of emulsified asphalt type asphalt grouting materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waterproof coating, in particular to a rare earth tailings modified emulsified asphalt type asphalt grouting material and application thereof. BACKGROUND

[0002] Asphalt grouting material refers to asphalt or modified asphalt material used for waterproof and anti-seepage grouting. The mechanism of asphalt grouting plugging is that asphalt is heated to an appropriate temperature to have a certain fluidity, and is delivered to the leakage site through a heat-resistant pump and a delivery pipeline. Since asphalt is not miscible with water, when hot asphalt encounters water, dispersion occurs after cooling. The continuously injected asphalt continuously condenses and spreads, gradually adheres to the joint wall. With the continuous thickening of the asphalt adhesion layer, the water seepage channel is continuously reduced until completely plugged. However, this method has a difficult-to-overcome disadvantage, that is, the required temperature for heating asphalt is high, and the viscosity of heated asphalt is high, which makes it difficult to grout.

[0003] Emulsified asphalt is an unstable mixed system of asphalt and water, which has the flow performance of water at room temperature and a similar form to water. Under certain conditions, asphalt and water separate, that is, demulsification. The decomposition and demulsification of emulsified asphalt is that the asphalt emulsion gradually contacts with the mineral material during and after construction, the properties of the emulsion gradually change, the water is absorbed and evaporated to continuously decrease, and the asphalt separates from the water phase in the emulsion, thereby having the inherent properties of asphalt: repulsion with water and solidification when encountering water. The time required for this process is the demulsification speed of the asphalt emulsion. This decomposition and demulsification is mainly caused by the adsorption of ionic charges and the evaporation of water after the emulsion contacts with the material. However, the traditional emulsified asphalt has problems such as solid particle sedimentation, random and disordered deposition, and difficult-to-control demulsification speed. SUMMARY

[0004] In order to solve the problems in the prior art, the present application provides a rare earth tailings modified emulsified asphalt type asphalt grouting material and application thereof.

[0005] In a first aspect, the present application provides a modified emulsified asphalt composition, comprising: asphalt and a modified component; the modified component comprises: an elastomer emulsion, rare earth tailings and a coupling agent; the modified emulsified asphalt composition comprises: 300-1200 parts by weight of the asphalt, 75-250 parts by weight of the elastomer emulsion and 3-24 parts by weight of the rare earth tailings.

[0006] The rare earth tailings are added in the system of emulsified asphalt, which can improve the colloid structure, can preliminarily form a network structure with the asphalt, and effectively improve the solid particle sedimentation problem of the emulsified asphalt product. More importantly, in the demulsification stage, the rare earth active points located on the outer side of the rare earth tailings can be coordinated and complexed with the polar groups of the asphalt and the active positions of the interface at the appropriate position when the asphalt modified by the rare earth tailings contacts the interface, so that the asphalt can be more stable and efficient to adhere to the interface. The rare earth tailings, the elastomer polymer and the asphalt located on the inner side form a more stable network structure, reduce the influence of external conditions on the demulsification process, and significantly improve the controllability of the demulsification process. The designed demulsification speed can meet the construction requirements of various types.

[0007] The rare earth tailings in the application are generally in the form of rare earth tailings powder added in the modified emulsified asphalt composition, which can better play a role in the system of emulsified asphalt.

[0008] The asphalt in the application can be various asphalts that can be used for the preparation of emulsified asphalt, such as 50#, 70#, 90# or 100# asphalt, preferably 70# asphalt.

[0009] Further, the asphalt is 400-900 parts by weight, the elastomer emulsion is 90-175 parts by weight, and the rare earth tailings are 4-18 parts by weight.

[0010] In some embodiments of the application, the asphalt is 500-700 parts by weight, the elastomer emulsion is 110-140 parts by weight, and the rare earth tailings are 5-14 parts by weight.

[0011] Further, the rare earth tailings account for 0.8-2.2% of the mass of the asphalt.

[0012] Further, the rare earth tailings are light rare earth tailings. Preferably, the rare earth tailings include lanthanum, cerium, neodymium, samarium, yttrium and gadolinium. Further preferably, the total mass of light rare earth elements in the rare earth tailings accounts for more than 90% of the total rare earth elements.

[0013] Further, the elastomer emulsion includes one or more of SBR emulsion, CR emulsion, NR emulsion or NVR emulsion.

[0014] The rare earth tailings in the application preferably have a total mass of light rare earth elements accounting for more than 90% of the total rare earth elements, and the elastomer emulsion is preferably SBR emulsion. The preferred rare earth tailings and SBR emulsion can form a relatively more stable network structure, and can more effectively control the demulsification process.

[0015] Further, the coupling agent comprises one or more of silane coupling agent, titanate coupling agent, aluminate coupling agent, zirconate coupling agent or polymer type coupling agent.

[0016] Preferably, the coupling agent is a silane coupling agent.

[0017] Further preferably, the mass ratio of the coupling agent to the rare earth tailings is 1: (1000-3000).

[0018] The coupling agent of the present application is used for coupling asphalt and rare earth tailings.

[0019] The present application realizes the coupling of rare earth tailings powder and asphalt by using a coupling agent, facilitates the formation of a network structure of mutual connection between the rare earth tailings powder and asphalt, and provides anchoring points for elastomers.

[0020] Further, it further comprises an emulsified component, which comprises an emulsifier, and one or more of a stabilizer, a pH regulator or a saponifier; preferably, the mass ratio of the asphalt to the emulsified component is (1.8-2.4):1.

[0021] As a preferred embodiment, the present application provides a modified emulsified asphalt composition, which comprises, in parts by weight, 70# asphalt 500-700 parts, SBR emulsion 110-140 parts, rare earth tailings 5-7 parts, coupling agent 0.0002-0.001 parts, emulsifier 20-35 parts, pH regulator 0.2-1 parts and water 280-340 parts.

[0022] The emulsifier is composed of petroleum sodium sulfonate, lignin sulfonate and long-chain sodium alkyl sulfonate, and the pH regulator is sodium hydroxide.

[0023] In a second aspect, the present application provides a preparation method of the modified emulsified asphalt composition as described above, which comprises: uniformly mixing a coupling agent, ethanol and water in a predetermined ratio, and placing them on the surface of rare earth tailings for drying treatment to obtain surface-modified rare earth tailings; Mixing asphalt and the surface-modified rare earth tailings at a temperature of 145-160℃, and performing high-speed shearing to obtain a molten blending phase; Mixing water and an emulsified component to obtain a saponified phase; Mixing the molten blending phase and the saponified phase to obtain the modified emulsified asphalt composition.

[0024] Further, the drying treatment comprises drying treatment at a temperature of 100-140℃ for 1.5-3 hours; and / or, The high-temperature condition comprises a temperature of 140-160℃; and / or, The high-speed shearing includes: shearing under the condition of 1000-1500 rpm for 30-50 minutes; and / or, The mass ratio of the melt blending phase and the soap solution phase is (5-8):(2-5); and / or, The emulsification process is carried out under the condition of 4000-5500 rpm.

[0025] In a third aspect, the present application provides an asphalt grouting material, comprising: the modified emulsified asphalt composition described above.

[0026] Further, the functional auxiliary agent, the demulsifier, the filler and water are further included; the mass percentage of the modified emulsified asphalt composition in the asphalt grouting material is 30-45%.

[0027] Further, the demulsifier includes polyvinyl alcohol and calcium chloride; the mass percentage of the demulsifier in the asphalt grouting material is 2-7.5%.

[0028] Based on the more controllable demulsification process of the modified emulsified asphalt composition described above, the present application further regulates the charge balance of the asphalt grouting material (emulsified state) by polyvinyl alcohol and calcium chloride, breaks the internal interfacial tension balance of the emulsified asphalt mixture at a suitable time, and thus realizes accurate regulation of the demulsification speed.

[0029] Further, the functional auxiliary agent includes one or more of defoaming agent, preservative, thickening agent, pH regulator; the mass percentage of the functional auxiliary agent in the asphalt grouting material is 0.5-1.5%.

[0030] In a fourth aspect, the present application provides the application of the asphalt grouting material described above in waterproofing of road engineering, bridge engineering, building engineering, water conservancy engineering, underground engineering or tunnel engineering.

[0031] The asphalt grouting material disclosed in the present application can be applied to various situations, for example, when cracks appear on the road due to vehicle load, temperature change, etc., the asphalt grouting material can be filled into the cracks to fill the gaps and prevent rainwater from infiltrating and eroding the roadbed, thereby restoring the integrity and waterproofness of the road surface. For example, cracks or leaks appear in the basement, the asphalt grouting material can be injected into the leakage site through pressure grouting to form a waterproof layer and effectively prevent groundwater from penetrating. For example, the roof waterproof layer is aging and damaged, and the asphalt grouting material can be used to repair cracks and leakage points to enhance the waterproof performance of the roof. In addition, the asphalt grouting material disclosed in the present application can also be used in similar scenarios of other bridge engineering, tunnel engineering or water conservancy process.

[0032] The present application has the following beneficial effects: The rare earth tailings modified emulsified asphalt can be better deposited on the interface in the demulsification stage, and has higher interface adhesion and water resistance. In addition, the rare earth tailings modified emulsified asphalt has suitable gel time, and can be applied to various construction scenes such as road and bridge, water conservancy facilities, building construction and tunnel engineering, which has important application value in the field of emulsified asphalt type asphalt grouting material. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] The experimental methods involved in the following embodiments are conventional methods in the art, for example, refer to the experimental manual in the art, or follow the conditions suggested in the manufacturer's instructions, if not specifically mentioned.

[0035] The experimental materials and reagents involved in the following embodiments can be obtained from commercial channels, if not specifically mentioned.

[0036] The coupling agent used in the following embodiments is a silane coupling agent, preferably an aminopropyl triethoxysilane coupling agent.

[0037] The asphalt used in the following embodiments is 70# asphalt, which can be commercially available (Jingbo 70# base asphalt).

[0038] The rare earth tailings powder in the following embodiments is mainly light rare earth elements, mainly including lanthanum, cerium and neodymium rare earth elements, and also including samarium, yttrium and gadolinium rare earth elements, if not specifically mentioned.

[0039] The content of light rare earth elements such as lanthanum, cerium, neodymium and samarium accounts for more than 90% of the mass of all rare earth elements.

[0040] For example, in addition to Example 3, the rare earth tailings powder can use Baiyun Obo rare earth tailings, which includes the following rare earth elements: lanthanum 19.1 μg / g, cerium 57.86 μg / g, neodymium 21.26 μg / g, samarium 3.306 μg / g, yttrium 2.762 μg / g, and gadolinium 3.243 μg / g.

[0041] The SBR emulsion used in the following embodiments is called styrene-butadiene emulsion, preferably BASF 7623 styrene-butadiene emulsion, with a solid content of 51%.

[0042] The filler used in the following examples is gypsum, preferably desulfurization gypsum (optional particle size, preferably 1000 mesh).

[0043] The defoaming agent used in the following examples is a silicone-based defoaming agent, which is commercially available (for example, Kefeng Chemical DA480).

[0044] The preservative used in the following examples is an isothiazolinone preservative, which is commercially available (for example, MERGAL K14 of American Troy Company).

[0045] The thickening agent used in the following examples is a cellulose ether thickening agent, preferably hydroxyethyl cellulose, which is commercially available (for example, Lotte Chemical, Korea, model B30K).

[0046] The pH adjuster used in the following examples is commercially available (for example, Dow AMP-95 pH adjuster).

[0047] Example 1 In this example, an asphalt grouting material is prepared by the following method: 1. Rare earth tailings modified emulsified asphalt.

[0048] (1) The silane coupling agent, anhydrous ethanol and distilled water are mixed uniformly according to a mass ratio of 5:45:50, and hydrolyzed at room temperature for 20 min. The obtained mixed solution is sprayed on the surface of the rare earth tailings, and the mass ratio of the silane coupling agent solution to the rare earth tailings is controlled at 1:100, and dried at 120°C for 2h to obtain surface modified rare earth tailings.

[0049] (2) Rare earth tailings powder modified asphalt is prepared by melt blending method.

[0050] First, the base asphalt is heated to 150-155°C, then the surface modified rare earth tailings powder (controlling the dosage at 1% of the mass of the asphalt) is slowly added into the preheated asphalt, and high speed shearing is carried out for 40 min to obtain the modified asphalt phase, which is kept at a temperature of 160-170°C for use.

[0051] (3) Preparation of soap solution phase.

[0052] The weight parts of each component are as follows: Table 1 Weight parts of each component of soap solution phase

[0053] Start stirring, add water, SBR emulsion, petroleum sulfonate sodium, lignin sulfonate, long-chain alkyl sodium sulfonate, and sodium hydroxide into the reaction kettle in order, and heat to 60-75°C for use, to obtain the soap solution phase.

[0054] (4) Turn on the colloid mill, adjust the speed to 4500 r / min, and feed the modified asphalt phase and soap liquid phase into the colloid mill at a mass ratio of 6:4 to obtain the finished rare earth modified emulsified asphalt.

[0055] 2. Preparation of asphalt grouting material.

[0056] (1) The weight parts of each component are as follows: Table 2. Weight parts of each component of asphalt grout

[0057] Components A and B are mixed in a 1:1 mass ratio.

[0058] (2) Production process: (2.1) Component A.

[0059] i) Draw the water required for the formula into the mixing tank, turn on the mixer, and set the speed to 600 r / min.

[0060] ii) Add 1000 mesh dehydrated gypsum into the mixing tank and stir at 600 r / min for 15 min.

[0061] iii) Add the defoamer, preservative, and thickener to the mixing tank and stir for 10 minutes, maintaining a speed of 600 r / min.

[0062] iv) Add the pH adjuster into the stirred tank and stir for 30 minutes, maintaining a speed of 600 r / min.

[0063] v) Finally, add rare earth modified asphalt, stir for 30 minutes, and maintain a speed of 500-600 r / min.

[0064] vi) Filter the material using a 100-mesh filter.

[0065] (2.2) Component B.

[0066] i) Draw the water required for the formula into the mixing tank, turn on the mixer, and set the speed to 600 r / min.

[0067] ii) Add polyvinyl alcohol powder into a mixing tank and stir at a speed of 600 r / min for 30 min.

[0068] iii) Add anhydrous calcium chloride, defoamer, and preservative to the mixing tank and stir for 10 minutes, maintaining a speed of 600 r / min.

[0069] iv) Filter the material using a 100-mesh filter.

[0070] Mix components A and B thoroughly to obtain asphalt grout.

[0071] Example 2 In this embodiment, the components of an asphalt grout are the same as those in Example 1, except that in the preparation process of rare earth tailings modified emulsified asphalt, the amount of surface-modified rare earth tailings powder added to the asphalt is 2%.

[0072] The preparation method of the asphalt grout is the same as in Example 1.

[0073] Example 3 In this embodiment, the components of an asphalt grout are the same as in Example 1, except that in the preparation process of rare earth tailings modified emulsified asphalt, the rare earth tailings powder used is light rare earth tailings from the Yakuping mining area in Mianning County, and the contents of each rare earth element are as follows: Lanthanum 16.91 μg / g, Cerium 15.47 μg / g, Neodymium 9.82 μg / g, Samarium 5.11 μg / g, Yttrium 3.14 μg / g, Gadolinium 1.13 μg / g.

[0074] Example 4 In this embodiment, the components of an asphalt grout are the same as those in Example 1, except that the weight of component A is adjusted to: 700 parts of rare earth modified emulsified asphalt, 291 parts of filler, 2 parts of defoamer, 2 parts of preservative, 4 parts of thickener, and 1 part of pH adjuster.

[0075] Example 5 In this embodiment, the components of an asphalt grout are the same as those in Example 1, except that in the preparation process of rare earth tailings modified emulsified asphalt, the SBR emulsion is replaced with an equal amount of CR emulsion.

[0076] Example 6 In this embodiment, the components of an asphalt grout are the same as those in Example 1, except that in the preparation process of the asphalt grout: polyvinyl alcohol in component B is replaced with xanthan gum, and anhydrous calcium chloride is replaced with calcium nitrate.

[0077] Comparative Example 1 In this comparative example, the components of an asphalt grout are the same as those in Example 1, except that iron tailings powder is used instead of rare earth tailings powder in the preparation process of rare earth tailings modified emulsified asphalt.

[0078] Comparative Example 2 In this comparative example, the components of an asphalt grout are the same as those in Example 1, except that in the preparation process of rare earth tailings modified emulsified asphalt, the amount of surface-modified rare earth tailings powder added to the asphalt is 0.5% of the asphalt mass.

[0079] Comparative Example 3 In this comparative example, the components of an asphalt grout are the same as in Example 1, except that in the preparation process of rare earth tailings modified emulsified asphalt, rare earth tailings powder is not used to modify the emulsified asphalt; instead, rare earth tailings powder is directly mixed into component A. Specifically, component A in step 2 of Example 1 is replaced as follows: Table 3 Asphalt Grouting Material A Component

[0080] In this case, the preparation of emulsified asphalt is that in step 1 of Example 1, processes (1) and (2) are not performed, and the modified asphalt in process (4) is replaced with base asphalt.

[0081] Comparative Example 4 In this comparative example, the components of an asphalt grout are the same as those in Example 1, except that asphalt is used instead of rare earth tailings modified emulsified asphalt in the preparation process of the rare earth tailings modified emulsified asphalt to prepare the asphalt grout.

[0082] Experimental Example 1 In this experimental example, performance tests were conducted on the asphalt grouting materials prepared in the examples and comparative examples. The procedure is as follows: The gel time properties of asphalt grout were tested using the JC / T 1018-2006 method.

[0083] The penetration height performance of asphalt grout was tested using the JC / T 1018-2006 method.

[0084] The bonding strength of asphalt grout was tested using the method specified in JC / T 408-2005.

[0085] The results are shown in the table below: Table 3 Performance comparison results of each embodiment and comparative example

[0086] The results above show that the gelation times of Comparative Examples 1, 2, and 4 far exceed the standard, exceeding 400 minutes, which does not meet the construction requirements. The impermeability of Comparative Examples 2-4 also exceeds 35mm, indicating insufficient water resistance. The asphalt grouting materials in Examples 1-6 all meet the construction requirements, with Examples 1-3 exhibiting the best performance.

[0087] 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 of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modified emulsified asphalt composition, comprising: Asphalt and The modified component is characterized in that it comprises: an elastomer emulsion, rare earth tailings, and a coupling agent; by weight, the modified emulsified asphalt composition comprises: 300-1200 parts of the asphalt, 75-250 parts of the elastomer emulsion, and 3-24 parts of the rare earth tailings.

2. The modified emulsified asphalt composition according to claim 1, characterized in that, By weight, the asphalt is 400-900 parts, the elastomer emulsion is 90-175 parts, and the rare earth tailings are 4-18 parts. Preferably, by weight, the asphalt is 500-700 parts, the elastomer emulsion is 110-140 parts, and the rare earth tailings are 5-14 parts.

3. The modified emulsified asphalt composition according to claim 1, characterized in that, The asphalt is 50#, 70#, 90#, or 100# asphalt, preferably 70# asphalt; and / or, The elastomer emulsion includes one or more of SBR emulsion, CR emulsion, NR emulsion, or NVR emulsion; preferably, the elastomer emulsion is an SBR emulsion. And / or, The rare earth tailings are light rare earth tailings. Preferably, the rare earth tailings include: lanthanum, cerium, neodymium, samarium, yttrium, and gadolinium; More preferably, the total mass of light rare earth elements in the rare earth tailings accounts for more than 90% of all rare earth elements.

4. The modified emulsified asphalt composition according to any one of claims 1-3, characterized in that, The coupling agent includes one or more of the following: silane coupling agent, titanate coupling agent, aluminate coupling agent, zirconate coupling agent, or polymer coupling agent; Preferably, the coupling agent is a silane coupling agent; More preferably, the mass ratio of the coupling agent to the rare earth tailings is 1:(1000~3000).

5. The modified emulsified asphalt composition according to any one of claims 1-4, characterized in that, It also includes an emulsifying component, which comprises an emulsifier and water, and one or more of a stabilizer, pH adjuster or saponifier; preferably, the mass ratio of the asphalt to the emulsifying component is (1.8~2.4):

1.

6. A method for preparing the modified emulsified asphalt composition according to any one of claims 1-5, characterized in that, include: The coupling agent, ethanol and water are mixed in a predetermined ratio and then placed on the surface of rare earth tailings for drying treatment to obtain surface-modified rare earth tailings. The asphalt and the surface-modified rare earth tailings were mixed at 145-160°C and subjected to high-speed shearing to obtain a melt blend phase. A soap liquid phase is obtained by mixing water, emulsifying components, and elastomer emulsion. The modified emulsified asphalt composition is obtained by mixing the molten blend phase and the soap liquid phase.

7. An asphalt grouting material, characterized in that, include: The modified emulsified asphalt composition according to any one of claims 1-3; preferably, the modified emulsified asphalt composition has a mass percentage of 30-45% in the asphalt grout.

8. The asphalt grouting material according to claim 7, characterized in that, Also includes: Functional additives, demulsifiers, fillers, and water; The demulsifier comprises polyvinyl alcohol and calcium chloride; the demulsifier accounts for 2-7.5% of the mass of the asphalt grout.

9. The asphalt grouting material according to claim 7 or 8, characterized in that, The functional additives include one or more of the following: defoamer, preservative, thickener, and pH adjuster; the mass percentage of the functional additives in the asphalt grout is 0.5-1.5%.

10. The application of the asphalt grouting material according to any one of claims 6-9 in waterproofing of road engineering, bridge engineering, building engineering, water conservancy engineering, underground engineering or tunnel engineering.

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