A cement pavement rapid repair interface agent and preparation method thereof

Abstract

The invention discloses an interface agent for rapid repair of cement pavement and a preparation method thereof. The interface agent comprises the following components, calculated by weight: 80-120 parts of epoxy resin; 20-50 parts of curing agent; 5-20 parts of active diluent; 1-2 parts of defoaming agent; 0.5-1.5 parts of leveling agent; 3-6 parts of epoxy accelerator; 5-10 parts of nano silicon dioxide; 5-10 parts of nano iron oxide; and 30-50 parts of quartz sand.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to an interface agent for rapid repair of cement pavement and a preparation method thereof. Background Art

[0002] Cement concrete pavements are widely used in road engineering due to their significant advantages, including high strength, high wear resistance, and long lifespan. However, as they age, they are susceptible to defects such as cracks, damaged slab edges and corners, mud pumping through joints, panel breakage, and misalignment. These defects severely impair the safety and durability of the pavement, posing a serious threat to traffic safety and driving quality. Therefore, timely and effective repair of damaged pavements is crucial.

[0003] At present, a series of rapid repair materials have emerged in the field of pavement repair, mainly including inorganic rapid repair materials, organic rapid repair materials and organic-inorganic composite rapid repair materials. Among them, epoxy resin mortar in organic rapid repair materials has been widely used in pavement repair due to its fast setting and hardening speed, excellent mechanical properties, good durability, high bonding strength and low shrinkage. However, the interface condition of the pavement repair area has a significant impact on the repair effect of epoxy mortar. For example, the interface after the use of templates, wet interfaces and easily peeled interfaces may all lead to a decrease in the bonding strength between epoxy mortar and the substrate. Therefore, before repairing pavement defects, it is usually necessary to apply a layer of interface agent to improve the bonding strength between epoxy mortar and the substrate.

[0004] The most commonly used organic pavement repair interface agents are asphalt interface agents, polyurethane interface agents and epoxy interface agents. Polyurethane interface agents have a fast curing speed, but have disadvantages such as a short application period and easy surface blistering. Asphalt interface agents have environmental problems and have requirements for base strength. Epoxy interface agents have the characteristics of adjustable cross-linking density, good permeability, high strength, and excellent adhesion to concrete substrates. In addition, the material is more compatible with epoxy mortar and is the most adaptable epoxy mortar interface agent. However, slow curing speed and poor water resistance are also problems that affect the repair effect and the efficiency of rapid repairs. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an interface agent for rapid repair of cement pavement and a preparation method thereof, which is mainly used in situations where epoxy resin mortar is used as a repair material, so as to solve the problems of cracks and debonding caused by weak bonding at the interface during the current rapid repair process of cement pavement. The interface agent has a fast curing speed, high bonding strength and certain water resistance.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The invention discloses an interface agent for rapid repair of cement pavement, which comprises the following components, calculated by weight: 80-120 parts of epoxy resin; 20-50 parts of curing agent; 5-20 parts of active diluent; 1-2 parts of defoaming agent; 0.5-1.5 parts of leveling agent; 3-6 parts of epoxy accelerator; 5-10 parts of nano-silicon dioxide; 5-10 parts of nano-iron oxide; and 30-50 parts of quartz sand.

[0008] Preferably, the epoxy resin is composed of bisphenol A epoxy resin and synthetic resin 3016LV(A), and the mass ratio of bisphenol A epoxy resin to synthetic resin 3016LV(A) is (1-4):(1-4).

[0009] Preferably, the curing agent comprises a mixture of one or both of JH-593 and 3016LV(B); when JH-593 and 3016LV(B) are mixed, the mass fraction of 3016LV(B) in the curing agent is 35% to 75% calculated by mass percentage.

[0010] Preferably, the reactive diluent is a combination of one or more of C12-14 alkyl glycidyl ether, butyl glycidyl ether, phenyl glycidyl ether, 1,4-butanediol diglycidyl ether, ethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether and neopentyl glycol diglycidyl ether.

[0011] Preferably, the defoaming agent is a combination of one or more of silicone oil-type epoxy defoaming agent, polyoxypropylene polyvinyl glycerol ether and tributyl phosphate.

[0012] Preferably, the leveling agent is a combination of one or more of BYK310 leveling agent, acrylate leveling agent 839 and SHYT4184 leveling agent.

[0013] Preferably, the epoxy accelerator is a combination of one or more of 2,4,6-tris(dimethylaminomethyl)phenol, benzyldimethylamine, and triethanolamine.

[0014] Preferably, the particle size of the nano-silicon dioxide is 20 to 50 nm; the particle size of the iron oxide is 30 to 60 nm; and the particle size of the quartz sand is 70 to 100 nm.

[0015] The present invention also provides a method for preparing an interface agent. The specific steps for preparing the interface agent are as follows:

[0016] S1: Mix bisphenol A epoxy resin E-51 and synthetic resin 3016LV(A) evenly;

[0017] S2: Then add reactive diluent, epoxy accelerator, curing agent, defoaming agent and leveling agent in sequence;

[0018] S3: Add nano-silicon dioxide, nano-iron oxide and quartz sand and continue stirring to obtain the interface agent.

[0019] Preferably, in S1, the stirrer rotates at a speed of 300-500 r / min for 1-2 min; in S2, the stirrer rotates at a speed of 600-1000 r / min for 3-5 min; in S3, the stirrer rotates at a speed of S2 unchanged and continues stirring for 5-10 min.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. After conducting in-depth research on epoxy resin, the present invention unexpectedly discovered that the low-stress, flexible synthetic resin 3016LV (A) was physically blended with a resin having excellent corrosion resistance and bonding properties in a certain proportion. As a synthetic resin with low stress and good flexibility, 3016LV (A) resin was selected as the base material of the blending system. The characteristic of this resin is that it contains a large number of flexible segments in its molecular structure, which can effectively disperse stress during the curing process and reduce the formation of microcracks caused by external impact or temperature changes, thereby improving the overall toughness and impact resistance of the material. At the same time, the present invention introduced a resin with excellent corrosion resistance and bonding properties as a blending component. After the introduction, the present invention found that it can improve the corrosion resistance and bonding properties of the blended epoxy resin. The two resins are combined together by physical blending to form a uniform composite system. The blended epoxy resin not only retains the low stress and flexibility of the 3016LV (A) resin, but also significantly enhances its bonding strength, especially exhibiting extremely strong adhesion on the surfaces of polar materials such as metal, glass, and concrete.

[0022] 2. The present invention also discovered that the specially selected JH-593 curing agent can be used alone or in combination with 3016LV(B). JH-593 curing agent can quickly initiate the cross-linking reaction of epoxy resin at room temperature, significantly shortening the curing time. Compared with traditional curing agents, JH-593 curing agent has a faster curing speed and can form a stable three-dimensional network structure in a shorter time, thereby improving the mechanical properties of the interface agent. At the same time, JH-593 curing agent also has a low viscosity, which allows for easy uniform mixing with the epoxy resin, ensuring that problems such as bubbles and holes will not appear during the curing process, further improving the quality of the interface agent.

[0023] 3. The present invention also found that on the basis of the blended epoxy resin, nano-silicon dioxide (SiO2) and nano-iron oxide were introduced as modifiers; the introduction of nano-silicon dioxide significantly enhanced the hydrophobicity of the interface agent, effectively reduced the impact of moisture on the interface agent, and improved its water resistance; moreover, the present invention found that nano-silicon dioxide can form a dense protective film on the surface of the interface agent to prevent moisture penetration, thereby improving the water resistance of the interface agent.

[0024] 4. The interface agent of the present invention also exhibits excellent corrosion resistance. Since the blending system contains a resin component with excellent corrosion resistance, the interface agent can effectively resist the erosion of various chemical media such as acids, alkalis, and salts, and is suitable for anti-corrosion projects in the chemical, petroleum, and electric power industries; BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the SEM image of the interface between the interface agent prepared in Example 4 and the cement mortar. DETAILED DESCRIPTION

[0026] The present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments derived by persons of ordinary skill in the art based on the present invention are within the scope of protection of the present invention.

[0027] Unless otherwise indicated in specific cases, the numerical ranges listed herein include the upper and lower limits, and all integers and fractions within the range, and are not limited to the specific values ​​listed when defining the range.

[0028] 1. An interface agent for rapid repair of cement pavement

[0029] Calculated by mass, the interface agent includes the following components: 80 to 120 parts of epoxy resin; 20 to 50 parts of curing agent; 5 to 20 parts of active diluent; 1 to 2 parts of defoaming agent; 0.5 to 1.5 parts of leveling agent; 3 to 6 parts of epoxy accelerator; 5 to 10 parts of nano silicon dioxide; 5 to 10 parts of nano iron oxide; and 30 to 50 parts of quartz sand.

[0030] In some embodiments of the present invention, the present invention has found that bisphenol A epoxy resin is widely used in various industrial fields due to its excellent mechanical properties, chemical resistance and electrical insulation. However, it is easy to generate large internal stress during the curing process, which may cause the material to crack. The present invention has found that the use of low-stress, flexible synthetic resin 3016LV (A) as a blending component can not only reduce the internal stress generated during curing, but also improve the flexibility and impact resistance of the material, which can well solve the shortcomings of bisphenol A epoxy resin. Such a ratio range ensures that the two resins can form a uniform composite system during the physical blending process, which not only retains the high strength and corrosion resistance of bisphenol A epoxy resin, but also gives the material better flexibility and impact resistance. If the mass ratio of bisphenol A epoxy resin to 3016LV (A) is not within this range, it will lead to an imbalance in the performance of the interface agent, which is not conducive to the application of the interface agent. Therefore, the mass ratio of bisphenol A epoxy resin to synthetic resin 3016LV(A) can be (1-4):(1-4), preferably (80:20) to (25:75), and can be 80:20, 50:50, 25:75, 70:30, 60:40, etc., as well as all ranges and sub-ranges between the above values. It should be understood that in embodiments, any of the above ranges can be combined with any other ranges.

[0031] In some embodiments of the present invention, two curing agents, JH-593 and 3016LV(B), are employed. When used alone, the former can rapidly initiate a cross-linking reaction in the epoxy resin at room temperature, shortening the curing time; the latter can ensure that phase separation or incomplete curing does not occur during the epoxy resin curing process. When the two are used in combination, they can optimize the mechanical properties and durability of the interface agent while ensuring rapid curing, helping to improve the material's flexibility and corrosion resistance. However, when the two are used in combination, if the 3016LV(B) dosage is too low, the interface agent will cure too quickly, affecting construction operations; however, if the 3016LV(B) dosage is too high, the interface agent will lack sufficient strength. Therefore, when JH-593 and 3016LV(B) are mixed, the mass fraction of 3016LV(B) in the curing agent, calculated as a percentage by mass, can be 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, etc., as well as all ranges and sub-ranges therebetween. It should be understood that in embodiments, any of the above ranges may be combined with any other ranges.

[0032] In some embodiments of the present invention, the reactive diluent is a combination of one or more of C12-14 alkyl glycidyl ether, butyl glycidyl ether, phenyl glycidyl ether, 1,4-butanediol diglycidyl ether, ethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether and neopentyl glycol diglycidyl ether.

[0033] In some embodiments of the present invention, the defoaming agent is a combination of one or more of a silicone oil-type epoxy defoaming agent, polyoxypropylene polyvinyl glycerol ether, and tributyl phosphate.

[0034] In some embodiments of the present invention, the leveling agent is a combination of one or more of BYK310 leveling agent, acrylate leveling agent 839 and SHYT4184 leveling agent.

[0035] In some embodiments of the present invention, the epoxy accelerator is a combination of one or more of 2,4,6-tris(dimethylaminomethyl)phenol, benzyldimethylamine, and triethanolamine.

[0036] In some embodiments of the present invention, the particle size of the nano-silicon dioxide is 20 to 50 nm; the particle size of the iron oxide is 30 to 60 nm; and the particle size of the quartz sand is 70 to 100 nm.

[0037] 2. Preparation method of an interface agent

[0038] S1: bisphenol A epoxy resin E-51 and synthetic resin 3016LV(A) are uniformly mixed; wherein the stirring speed is 300-500 r / min and the stirring is performed for 1-2 minutes;

[0039] S2: Then add the reactive diluent, epoxy accelerator, curing agent, defoaming agent and leveling agent in sequence; the stirrer speed is 600-1000r / min, and stir for 3-5min;

[0040] S3: Add nano-silicon dioxide, nano-iron oxide and quartz sand and continue stirring at a stirrer speed of 600 to 1000 r / min for 5 to 10 minutes to obtain the interface agent.

[0041] 3. Examples and Comparative Examples

[0042] Example 1

[0043] Mix bisphenol A epoxy resin E-51 and synthetic resin 3016LV (A) evenly, stir at a speed of 300-500 r / min for 1-2 minutes, then add active diluent, epoxy accelerator, curing agent, defoaming agent and leveling agent in sequence, adjust the speed to 600-1000 r / min, stir for 3-5 minutes, then add nano silicon dioxide, nano iron oxide and quartz sand, keep the speed constant and stir for 5-10 minutes to obtain an environmentally friendly interface agent for rapid repair of cement pavement.

[0044] The components of Examples 2 to 7 and Comparative Examples 1 to 4 were prepared according to Table 1, and the interface agent was prepared according to the method of Example 1.

[0045] Table 1 (Unit: parts by weight)

[0046]

[0047] 4. Performance Testing

[0048] The setting time and bonding strength of the interface agent were tested. The setting time of the interface agent was measured in a constant temperature water bath at 25°C. The starting time was when all components began to mix, and they were stirred quickly with a glass rod. The end time was recorded when the viscosity of the glue began to increase, the beaker heated up, and stringing appeared until stringing could no longer be produced. The gel time was the difference between the end time and the start time. Repeat three times and take the average value.

[0049] The flexural bond strength test method was used to examine the effect of the aforementioned interface agent on the adhesive properties of epoxy mortar repairs. The test specimens, measuring 40 mm x 40 mm x 160 mm, consisted of half cement mortar and half epoxy resin mortar. The cement mortar half was cut from a 28-day-cured cement mortar block under standard curing conditions. After cutting, the interface agent was applied to the interface. The epoxy resin mortar half was then cast directly into a test mold pre-installed with the cement mortar half. After forming, the specimens were cured under standard curing conditions to the specified age before testing. The specimens were placed in a universal testing machine at a loading rate of 50 N / s. The ultimate load was recorded, and the bond strength value was the average of three specimens. The test results are shown in the table below.

[0050] Table 2

[0051]

[0052] Combining Table 1 and Table 2, we can see that:

[0053] (1) In terms of setting time: As the proportion of synthetic resin 3016LV(A) increases, the setting time of Examples 1 to 7 gradually shortens. In particular, in Example 7, due to the use of a higher proportion of 3016LV(A) and curing agent 3016LV(B), the setting time is significantly reduced to 26 minutes. This shows that the addition of 3016LV(A) and 3016LV(B) not only improves the flexibility of the material but also accelerates the curing process. Moreover, the setting time of Comparative Example 1 is significantly longer than that of Examples 5-7. This is because Comparative Example 1 only uses bisphenol A epoxy resin E51 and does not add 3016LV(A), so the curing speed is relatively slow. The setting time of Comparative Example 3 is as long as 239 minutes, which is much longer than all the examples. This is because the curing agent JH-593 in Comparative Example 3 is replaced by ethylenediamine, which has a low reactivity and results in an extremely slow curing speed. This also shows that other curing agents in the prior art are not suitable for the interface agent system described in the present invention. The setting time of Comparative Example 4 is 34 minutes, which is close to that of Comparative Example 1. This may be because ordinary Portland cement is used in Comparative Example 4, which only serves as a functional filler and does not participate in the reaction, so it has little effect on the curing reaction speed.

[0054] (2) In terms of bonding strength: as the ratio of 3016LV(A) and 3016LV(B) increases, the bonding strength of Examples 1 to 7 first increases and then decreases. The highest bonding strength is in Example 5. This shows that the addition of an appropriate amount of 3016LV(A) and 3016LV(B) not only accelerates the curing speed, but also significantly improves the early bonding strength and long-term bonding strength. Excessive addition will reduce the bonding strength. The reason may be that the excessive ratio of 3016LV(A) and 3016LV(B) causes the resin to produce an implosion phenomenon, resulting in bubbles and holes in the resin, which reduces the resin performance. The bonding strength of Comparative Example 1 is significantly lower than that of Example 5. Although Comparative Example 1 uses a larger amount of bisphenol A epoxy resin E51, due to the lack of the flexibility of 3016LV(A) and the rapid curing effect of 3016LV(B), the overall improvement in its bonding strength is very limited. In Comparative Example 3, since the curing agent is replaced with ethylenediamine, the curing process is significantly affected. Since the ethylenediamine curing agent has lower operability than the curing agent JH-593, the fluidity of the interface agent decreases, resulting in a decrease in the adhesion between the interface agent and the substrate, and ultimately the overall bonding strength of Comparative Example 3 is lower. Compared with the examples, Comparative Example 4 has little effect on the overall bonding strength, but its water resistance is significantly lower than that of the examples, and nano-silica can physically interact with the epoxy resin molecules. This effect allows the nano-silica to be fully dispersed in the epoxy resin matrix, thereby improving the compatibility and surface smoothness of the nano-silica with the epoxy resin, and then improving the hydrophobicity of the interface agent, thereby improving the water resistance of the interface agent. In addition, the incorporated nano-iron oxide has a certain photocatalytic activity and can degrade organic pollutants, giving the interface agent a self-cleaning effect, making the interface agent more environmentally friendly.

[0055] (3) Water resistance and alkali resistance: Examples 1 to 7 all have good water resistance and alkali resistance. The reason may be that nano-silicon dioxide can physically interact with epoxy resin molecules, which allows nano-silicon dioxide to be fully dispersed in the epoxy resin matrix, thereby improving the compatibility of nano-silicon dioxide with epoxy resin and the surface smoothness, thereby improving the hydrophobicity of the interface agent, thereby improving the water resistance of the interface agent. In addition, the incorporated nano-ferric oxide has a certain photocatalytic activity and can degrade organic pollutants, making the interface agent have a self-cleaning effect, making the interface agent more environmentally friendly. However, in Comparative Example 1, the water resistance and alkali resistance are significantly inferior to those of Example 5; in Comparative Example 3, the strength of the ethylenediamine curing agent loses strength very quickly, and the toughness is insufficient and the brittleness is large, which also leads to a very significant decrease in the water resistance and alkali resistance of Comparative Example 3; in Comparative Example 4, due to the lack of the addition of nano-silicon dioxide and nano-ferric oxide, the water resistance and alkali resistance are significantly affected.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the technical solutions. Those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present invention that do not depart from the purpose and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An interface agent for rapid repair of cement pavement, characterized in that: The interface agent comprises the following components, calculated by weight: 80-120 parts of epoxy resin; 20-50 parts of curing agent; 5-20 parts of active diluent; 1-2 parts of defoaming agent; 0.5-1.5 parts of leveling agent; 3-6 parts of epoxy accelerator; 5-10 parts of nano-silicon dioxide; 5-10 parts of nano-iron oxide; 30-50 parts of quartz sand; The epoxy resin is composed of bisphenol A epoxy resin E-51 and synthetic resin 3016LV(A), and the mass ratio of bisphenol A epoxy resin E-51 and synthetic resin 3016LV(A) is (1-4): (1-4); The curing agent is JH-593 and 3016LV(B); calculated by mass percentage, the mass fraction of 3016LV(B) in the curing agent is 35% to 75%.

2. The interface agent according to claim 1, characterized in that The active diluent is a combination of one or more of C12-14 alkyl glycidyl ether, butyl glycidyl ether, phenyl glycidyl ether, 1,4-butanediol diglycidyl ether, ethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether and neopentyl glycol diglycidyl ether.

3. The interface agent according to claim 1, characterized in that The defoaming agent is a combination of one or more of a silicone oil-type epoxy defoaming agent, polyoxypropylene polyvinyl glycerol ether and tributyl phosphate.

4. The interface agent according to claim 1, characterized in that The leveling agent is a combination of one or more of BYK310 leveling agent, acrylate leveling agent 839 and SHYT4184 leveling agent.

5. The interface agent according to claim 1, characterized in that: The epoxy accelerator is a combination of one or more of 2,4,6-tris(dimethylaminomethyl)phenol, benzyldimethylamine, and triethanolamine.

6. The interface agent according to claim 1, characterized in that: The particle size of the nano-silicon dioxide is 20-50 nm; the particle size of the nano-iron oxide is 30-60 nm; and the particle size of the quartz sand is 70-100 μm.

7. A method for preparing an interface agent, characterized in that: The preparation of the interface agent according to any one of claims 1 to 6 comprises the following specific steps: S1: Mix bisphenol A epoxy resin E-51 and synthetic resin 3016LV (A) evenly; S2: Then add reactive diluent, epoxy accelerator, curing agent, defoaming agent and leveling agent in sequence; S3: Add nano-silicon dioxide, nano-iron oxide and quartz sand and continue stirring to obtain the interface agent.

8. The preparation method according to claim 7, characterized in that: In S1, the stirrer speed is 300~500r / min, and stirring is carried out for 1~2min; in S2, the stirrer speed is 600~1000r / min, and stirring is carried out for 3~5min; in S3, the stirrer speed of S2 is kept unchanged, and stirring is continued for 5~10min.

Images