Pavement crack modified epoxy repair material and preparation method thereof

Abstract

The invention provides a pavement crack modified epoxy repair material and a preparation method thereof. The pavement crack modified epoxy repair material comprises the following raw materials in parts by weight: 60-80 parts of quartz sand, 15-20 parts of modified epoxy resin, 4-8 parts of a resin reinforcing agent, 2-5 parts of a curing agent, 2-5 parts of a diluent and 20-35 parts of water. The pavement crack modified epoxy repair material is constructed by adopting a cold-mixed mortar mode, has excellent groutability, can quickly and efficiently fill pavement cracks and shorten road repair time, has relatively good binding power with old concrete, has no obvious difference after repair, has good anti-seepage performance of a repaired road, and has a good application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of repair materials, in particular to a pavement crack modified epoxy repair material and a preparation method thereof. BACKGROUND

[0002] With the rapid development of transportation industry, the construction scale of transportation infrastructure such as highways and urban roads is continuously expanding. As the direct bearing part of the road, the quality and durability of the pavement are directly related to the performance and traffic safety of the road. However, in the long-term use process, the pavement is inevitably affected by various natural factors and traffic loads, leading to the generation and expansion of cracks, which has become one of the most common and intractable problems in pavement diseases. The existence of cracks not only reduces the flatness and driving comfort of the pavement, but also accelerates the further damage of the pavement. For example, after rainwater seeps into the cracks, it will erode the base and subgrade. Under the repeated action of vehicle load, more serious diseases such as potholes and mud pumping may be caused, which seriously shortens the service life of the pavement and increases the maintenance cost and difficulty of the road. Therefore, it is of great practical significance to develop an efficient and reliable pavement crack repair material.

[0003] Traditional pavement crack repair materials include asphalt-based repair materials, cement-based repair materials and ordinary epoxy resin repair materials. The asphalt-based repair material has certain flexibility and adhesion, relatively simple construction and low cost, and is one of the most widely used pavement crack repair materials at present. However, it also has obvious shortcomings. First, the asphalt material has poor aging resistance. Under the action of long-term light, oxidation and temperature change, it is easy to become hard and brittle, thus leading to the re-cracking of the repaired cracks. Second, the adhesion strength of asphalt material to the crack wall is limited. Under the action of vehicle load, the repair material is easy to fall off from the crack, and cannot achieve long-term effective repair. In addition, for some wider or deeper cracks, the pure asphalt-based repair material is difficult to completely fill, and the repair may not be dense. The cement-based repair material has high strength and stability, and can well withstand the action of vehicle load. However, the cement material has large rigidity and insufficient flexibility, and is easy to produce new cracks when the pavement is subjected to temperature change or vehicle impact. Moreover, the cement-based repair material has a long setting time, and a long traffic closure time is required during the repair process, which brings inconvenience to road traffic. At the same time, the cement material has poor compatibility with the old pavement material, and is easy to cause interface separation, affecting the repair effect. The epoxy resin has good adhesion, mechanical properties and chemical stability, and has certain application potential in the field of pavement crack repair. However, the ordinary epoxy resin also has some shortcomings. Its curing speed is slow, and it often needs a long time to reach sufficient strength at room temperature, which is a great limitation for the road that needs to open traffic as soon as possible.

[0004] Therefore we can introduce various active groups such as amino, carboxyl, hydroxyl and the like by modifying the epoxy resin, which can react with the active sites on the surface of the pavement material to form chemical bonds, thereby greatly improving the bonding strength, the pouring property, the anti-seepage property and the curing speed of the repairing material and the crack wall.

[0005] In view of the problems in the prior art, the present application aims to solve the problems of long curing time, poor pouring capacity and poor anti-seepage performance of the pavement crack repairing material. SUMMARY

[0006] The purpose of the present application is to provide a pavement crack modified epoxy repairing material and a preparation method thereof, which solves the problems of long curing time, poor pouring capacity and poor anti-seepage performance of the pavement crack repairing material.

[0007] The technical scheme of the present application is as follows:

[0008] The present application provides a pavement crack modified epoxy repairing material, and the raw materials for preparing the pavement crack modified epoxy repairing material include, by weight fraction, 60-80 parts of quartz sand, 15-20 parts of modified epoxy resin, 4-8 parts of resin reinforcing agent, 2-5 parts of curing agent, 2-5 parts of diluent and 20-35 parts of water.

[0009] Further, the fineness of the quartz sand is 150-300 m 2 / kg.

[0010] Further, the raw materials for preparing the modified epoxy resin include amino silicone oil, epoxy resin and silicon powder.

[0011] The preparation method of the modified epoxy resin comprises the following steps:

[0012] S1: the amino silicone oil and the epoxy resin are added into a reaction kettle, and a stirring device is started to stir at a stirring speed of 300-600 r / min for 30-60 minutes, so that the two are preliminarily mixed uniformly;

[0013] S2: the reaction temperature in step S1 is increased to 80-100 DEG C, the silicon powder is added, and stirring is performed at a stirring speed of 600-800 r / min for 3-6 hours, and the pressure in the reaction container is reduced by using a reduced-pressure defoaming method, so that the gas bubbles escape, the degree of the reduced pressure is generally controlled to be between -0.05 and -0.1 MPa, the defoaming time is about 30-60 minutes, and until there is no obvious gas bubble on the surface of the mixture.

[0014] S3: the mixture prepared in step S2 is allowed to stand and filtered to obtain the modified epoxy resin.

[0015] Further, the addition amount of the amino silicone oil is 15-30% of the mass of the epoxy resin.

[0016] Furthermore, the added amount of the silicon micropowder is 10-15% of the mass of the epoxy resin.

[0017] Furthermore, the amino silicone oil has an ammonia value of 1.8-2.5 mmol / g.

[0018] Furthermore, the mesh size of the silicon micropowder is 600-1000 mesh.

[0019] Furthermore, the resin reinforcing agent is selected from a mixture of one or more of polyurethane elastomer resin and polyamide resin.

[0020] Furthermore, the curing agent is a mixture of one or more of tetraethylenepentamine, dodecenylsuccinic anhydride, and N-aminoethylpiperazine.

[0021] Furthermore, the diluent is a mixture of one or more of dimethyl carbonate, ethylene glycol ethyl ether, and ethyl acetate.

[0022] The present invention also provides a method for preparing a pavement crack modified epoxy repair material, which is characterized by comprising the following steps:

[0023] Step (1): Pour quartz sand into a mixer, then add modified epoxy resin and stir evenly;

[0024] Step (2): After stirring evenly, add resin reinforcing agent, curing agent, diluent and water in sequence, and stir for 10 to 30 minutes to obtain pavement crack modified epoxy repair material.

[0025] The present invention provides a modified epoxy repair material for pavement cracks. The amino group in the amino silicone oil reacts with the epoxy group in the epoxy resin, which can affect the curing reaction process of the epoxy resin. On the one hand, the amino group can act as an active site to promote the reaction between the epoxy group and the curing agent, thereby accelerating the curing speed; on the other hand, it can also regulate the activity of the reaction, so that the curing reaction proceeds more evenly. The amino group in the amino silicone oil molecule is an active group that can chemically react with active groups such as hydroxyl groups (-OH) on the surface of old concrete to form hydrogen bonds or chemical bonds. This chemical bonding can establish a strong connection between the repair material and the old concrete, greatly enhancing the bonding force. Silica powder has a large specific surface area, providing more reaction sites for the curing reaction of the epoxy resin. During the curing process, the surface of the silica powder can adsorb curing agent molecules, making the curing agent more evenly distributed in the epoxy resin, thereby promoting the reaction between the epoxy group and the curing agent and accelerating the curing speed.

[0026] Beneficial effects:

[0027] The present application provides a kind of road surface crack modified epoxy repair material, the road surface crack modified epoxy repair material of the present application has excellent impermeability, can be filled with, quickly, efficiently road surface crack, shorten road repair time, with old concrete between there is good bonding force, there is no obvious difference after repair, it is a kind of high-performance material, with good economic benefit. DETAILED DESCRIPTION

[0028] The present application will be described below in conjunction with specific embodiments. It should be noted that the following examples are examples of the present application, only to illustrate the present application, and not to limit the present application. Without deviating from the main idea or scope of the present application, other combinations and various modifications within the concept of the present application can be made.

[0029] Other chemical reagents used in the present application are commercially available unless otherwise specified.

[0030] The epoxy resin is bisphenol A type epoxy resin, model E51, purchased from Guangzhou Hengjia Chemical Co., Ltd.; polyurethane elastomer resin is purchased from Dongguan Chenxi Plastic Raw Material Co., Ltd., model KU2-8715; polyamide resin is purchased from Shanghai Fuchen Plastic Raw Material Co., Ltd., model PA66.

[0031] Preparation of modified epoxy resin A:

[0032] S1: 0.75 kg of amino silicone oil (ammonia value is 2.5 mmol / g), 5 kg of epoxy resin is added to the reaction kettle, the stirring device is started, the stirring speed is 400 r / min, and the stirring is carried out for 30 minutes to make the two preliminary mixed uniformly;

[0033] S2: the reaction temperature of step S1 is increased to 80 DEG C, 0.75 kg of silicon powder (800 mesh) is added, the stirring speed is 800 r / min, and the stirring reaction is carried out for 4 hours; the pressure in the reaction vessel is reduced by using the method of vacuum degassing, so that the gas bubbles escape; the degree of vacuum is generally controlled between-0.1 MPa, the vacuum time is about 30 minutes, until there is no obvious gas bubble on the surface of the mixture;

[0034] S3: the mixture prepared in step S2 is placed and filtered to obtain the modified epoxy resin.

[0035] Preparation of modified epoxy resin B:

[0036] The difference between the present preparation and the modified epoxy resin A is that: 0.75 kg of amino silicone oil (ammonia value is 2.5 mmol / g) in step S1 is replaced by 1.5 kg of amino silicone oil (ammonia value is 1.8 mmol / g); 0.75 kg of silicon powder (800 mesh) in step S2 is replaced by 0.5 kg of silicon powder (800 mesh);

[0037] Preparation of modified epoxy resin C:

[0038] The difference between this preparation and modified epoxy resin A is that 0.75 kg of amino silicone oil (ammonia value of 2.5 mmol / g) is replaced by 0.5 kg of amino silicone oil (ammonia value of 2.5 mmol / g) in step S1.

[0039] Preparation of modified epoxy resin D:

[0040] The difference between this preparation and modified epoxy resin A is that 0.75 kg of amino silicone oil (ammonia value of 2.5 mmol / g) is replaced by 2 kg of amino silicone oil (ammonia value of 2.5 mmol / g) in step S1.

[0041] Preparation method of pavement crack modified epoxy repair material:

[0042] Step (1): Pour the quartz sand into the blender, then add the modified epoxy resin, and stir evenly;

[0043] Step (2): After stirring evenly, add the resin reinforcing agent, curing agent, diluent, and water in sequence, and stir for 10-30 minutes to prepare the pavement crack modified epoxy repair material.

[0044] Note: 0.1 kg in Examples 1-5 and Comparative Examples 1-3 is equal to 1 part by weight.

[0045] Example 1

[0046] Step (1): Pour 6 kg of quartz sand into the blender, then add 2 kg of modified epoxy resin A, and stir evenly;

[0047] Step (2): After stirring evenly, add 0.3 kg of polyurethane elastomer resin, 0.3 kg of polyamide resin, 0.5 kg of tetraethylene pentamine, 0.2 kg of dimethyl carbonate, 0.2 kg of ethylene glycol ethyl ether, and 2 kg of water in sequence, and stir for 15 minutes to prepare the pavement crack modified epoxy repair material.

[0048] Example 2

[0049] Step (1): Pour 8 kg of quartz sand into the blender, then add 1.5 kg of modified epoxy resin A, and stir evenly;

[0050] Step (2): After stirring evenly, add 0.8 kg of polyurethane elastomer resin, 0.1 kg of tetraethylene pentamine, 0.1 kg of dodecenyl succinic anhydride, 0.1 kg of dimethyl carbonate, 0.2 kg of ethylene glycol ethyl ether, and 3 kg of water in sequence, and stir for 15 minutes to prepare the pavement crack modified epoxy repair material.

[0051] Example 3

[0052] Step (1): Pour 6 kg of quartz sand into a mixer, then add 2 kg of modified epoxy resin B and stir evenly;

[0053] Step (2): After stirring evenly, add 0.3 kg of polyurethane elastomer resin, 0.3 kg of polyamide resin, 0.5 kg of tetraethylene pentamine, 0.2 kg of dimethyl carbonate, 0.2 kg of ethylene glycol ethyl ether, and 2 kg of water in sequence, and stir for 15 minutes to obtain a pavement crack modified epoxy repair material.

[0054] Example 4

[0055] Step (1): Pour 6 kg of quartz sand into a mixer, then add 2 kg of modified epoxy resin C and stir evenly;

[0056] Step (2): After stirring evenly, add 0.3 kg of polyurethane elastomer resin, 0.3 kg of polyamide resin, 0.5 kg of tetraethylene pentamine, 0.2 kg of dimethyl carbonate, 0.2 kg of ethylene glycol ethyl ether, and 2 kg of water in sequence, and stir for 15 minutes to obtain a pavement crack modified epoxy repair material.

[0057] Example 5

[0058] Step (1): Pour 6 kg of quartz sand into a blender, then add 2 kg of modified epoxy resin D and stir evenly; Step (2): After stirring evenly, add 0.3 kg of polyurethane elastomer resin, 0.3 kg of polyamide resin, 0.5 kg of tetraethylene pentamine, 0.2 kg of dimethyl carbonate, 0.2 kg of ethylene glycol ethyl ether, and 2 kg of water in sequence, stir for 15 minutes, and prepare a pavement crack modified epoxy repair material.

[0059] Comparative Example 1:

[0060] Step (1): Pour 6 kg of quartz sand into a mixer, then add 2 kg of epoxy resin and stir evenly;

[0061] Step (2): After stirring evenly, add 0.3 kg of polyurethane elastomer resin, 0.3 kg of polyamide resin, 0.5 kg of tetraethylene pentamine, 0.2 kg of dimethyl carbonate, 0.2 kg of ethylene glycol ethyl ether, and 2 kg of water in sequence, and stir for 15 minutes to obtain a pavement crack modified epoxy repair material.

[0062] Comparative Example 2:

[0063] Step (1): Pour 6 kg of quartz sand into a mixer, then add 0.5 kg of modified epoxy resin A and stir evenly;

[0064] Step (2): After stirring evenly, 0.3 kg of polyurethane elastomer resin, 0.3 kg of polyamide resin, 0.5 kg of tetraethylene pentamine, 0.2 kg of dimethyl carbonate, 0.2 kg of ethylene glycol ether, and 2 kg of water were added in sequence, and stirred for 15 minutes to prepare a road crack modified epoxy repair material.

[0065] Comparative Example 3:

[0066] Step (1): 6 kg of quartz sand was poured into a blender, and then 2 kg of modified epoxy resin A was added, and stirred evenly;

[0067] Step (2): After stirring evenly, 0.5 kg of tetraethylene pentamine, 0.2 kg of dimethyl carbonate, 0.2 kg of ethylene glycol ether, and 2 kg of water were added in sequence, and stirred for 15 minutes to prepare a road crack modified epoxy repair material.

[0068] Referring to the principle of the cement standard consistency water requirement, setting time, and stability test method (GB / T 1346), the road crack modified epoxy repair materials prepared in Examples 1-5 and Comparative Examples 1-3 were placed in the test mold of the Vicat apparatus under the conditions of 20±2℃ and a relative humidity of 90%, and the depth of the test needle sinking into the repair material was observed. When the test needle sinks into the material to a distance of 5 mm from the bottom plate, the time at this point is recorded as the initial setting time. This time can preliminarily determine the time when the repair material begins to lose fluidity on the road surface, which is an important node in the repair process.

[0069] The road crack modified epoxy repair materials prepared in Examples 1-5 and Comparative Examples 1-3 were filled in the concrete cracks, and after pouring was completed, curing was performed, the concrete surface was kept moist, and after 28 days of curing, the following tests were performed:

[0070] 1. Permeability resistance: The step-by-step pressure method in the Standard Test Method for Long-Term Performance and Durability of Ordinary Concrete (GB / T 50082-2009) was used to determine the permeability resistance of the concrete.

[0071] 2. Pourability test: A standard funnel was used to pour the cold-mixed mortar into the funnel, and the time for complete flow was measured. The shorter the time, the better the pourability.

[0072] 3. Bond strength test: The method in the Technical Specification for Post-anchoring of Concrete Structures (JGJ 145) was used, a shear force was applied to the test piece, the maximum load at the time of shear failure was measured, and the shear bond strength was calculated.

[0073] Table 1: Performance test results table

[0074]

[0075] As shown in Table 3, the pavement crack modified epoxy repair material prepared by the present invention has excellent impermeability, frost resistance, carbonization resistance and self-repairing properties. Specifically, as shown in Examples 4 to 5 compared with Example 1, when preparing the modified epoxy resin, the addition of an unreasonable amount of amino silicone oil will cause the impermeability and pourability of the pavement crack modified epoxy repair material to deteriorate, and the initial setting time to be prolonged, thus failing to achieve the desired effect. As shown in Comparative Example 1 compared with Example 1, the addition of ordinary epoxy resin will result in poor impermeability, pourability, and adhesion, and a long road repair time, thus failing to achieve the desired effect. As shown in Comparative Example 2 compared with Example 1, the addition of too little modified epoxy resin will result in poor impermeability, pourability, and adhesion, and a long road repair time, thus failing to achieve the desired effect. As shown in Comparative Example 3 compared with Example 1, when no resin enhancer is added, the pavement crack modified epoxy repair material will have poor impermeability, pourability, and adhesion, and a long road repair time, thus failing to achieve the desired effect.

[0076] The present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A pavement crack modified epoxy repair material, characterized in that: The raw materials for preparing the pavement crack modified epoxy repair material include, by weight, 60-80 parts of quartz sand, 15-20 parts of modified epoxy resin, 4-8 parts of resin reinforcing agent, 2-5 parts of curing agent, 2-5 parts of diluent, and 20-35 parts of water.

2. The pavement crack modified epoxy repair material according to claim 1, characterized in that: The quartz sand fineness is 150-300m 2 / kg.

3. The pavement crack modified epoxy repair material according to claim 1, characterized in that: The raw materials for preparing the modified epoxy resin include amino silicone oil, epoxy resin and silicon powder.

4. The pavement crack modified epoxy repair material according to claim 3, characterized in that: The preparation method of the modified epoxy resin comprises the following steps: S1: Add amino silicone oil and epoxy resin into the reactor, turn on the stirring device, and stir at a stirring speed of 300-600 r / min for 30-60 minutes to make the two mixed evenly; S2: Raise the reaction temperature in step S1 to 80-100°C, add silicon powder, and stir the mixture at a stirring speed of 600-800 r / min for 3-6 hours. Use decompression degassing to reduce the pressure in the reaction vessel to allow bubbles to escape. The degree of decompression is generally controlled between -0.05 and 0.1 MPa. The degassing time is about 30-60 minutes, until no obvious bubbles are left on the surface of the mixture. S3: allowing the mixture obtained in step S2 to stand and filtering to obtain the modified epoxy resin.

5. The pavement crack modified epoxy repair material according to claim 3, characterized in that: The added amount of the amino silicone oil is 15-30% of the mass of the epoxy resin; the added amount of the silicon micropowder is 10-15% of the mass of the epoxy resin.

6. The pavement crack modified epoxy repair material according to claim 3, characterized in that: The amino silicone oil has an ammonia value of 1.8-2.5 mmol / g; and the silicon micropowder has a mesh size of 600-1000 mesh.

7. The pavement crack modified epoxy repair material according to claim 1, characterized in that: The resin reinforcing agent is selected from a mixture of one or more of polyurethane elastomer resin and polyamide resin.

8. The pavement crack modified epoxy repair material according to claim 1, characterized in that: The curing agent is a mixture of one or more of tetraethylenepentamine, dodecenylsuccinic anhydride and N-aminoethylpiperazine.

9. The pavement crack modified epoxy repair material according to claim 1, characterized in that: The diluent is a mixture of one or more of dimethyl carbonate, ethylene glycol ethyl ether and ethyl acetate.

10. The method for preparing the pavement crack modified epoxy repair material according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step (1): Pour quartz sand into a mixer, then add modified epoxy resin and stir evenly; Step (2): After stirring evenly, add resin reinforcing agent, curing agent, diluent and water in sequence, and stir for 10 to 30 minutes to obtain pavement crack modified epoxy repair material.

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