Self-healing interface binder and preparation method thereof

Abstract

The invention discloses a self-healing interface binder and a preparation method thereof, and belongs to the technical field of binder preparation. The adhesive is prepared from 90 to 110 parts of water, 8 to 12 parts of absolute ethyl alcohol, 50 to 70 parts of cement, 20 to 30 parts of mineral admixture, 15 to 25 parts of polymerized emulsion, 3 to 7 parts of silane coupling agent, 10 to 15 parts of nano silicon dioxide, 5 to 12 parts of unsaturated amide, 8 to 12 parts of unsaturated acid, 4 to 7 parts of biogel, 5 to 8 parts of thixotropic agent, 3 to 6 parts of dispersing agent and 3 to 6 parts of initiator. The mineral admixture comprises silicon powder and rice hull powder in a mass ratio of 3: 7, the polymerized emulsion is vinyl acetate, the silane coupling agent is KH570, the unsaturated amide is acrylamide, and the unsaturated acid is acrylic acid. According to the interface binder prepared by the preparation method disclosed by the invention, through physical permeation and chemical combination, the bonding strength with concrete can be remarkably improved, and the problems of hollowing and cracking are reduced; in addition, a compact protective layer can be formed on the surface of the interface binder, air and moisture are effectively prevented from invading, and the durability of the concrete is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of adhesive preparation, and in particular relates to a self-healing interface adhesive and a preparation method thereof. Background Art

[0002] With the acceleration of urbanization in modern society, transportation infrastructure construction is becoming increasingly important. Concrete structures, such as roads and bridges, are widely used in national economic development due to their durability and load-bearing capacity. However, with the expansion of urban areas and the increase in traffic volume, roads and bridges are constantly facing challenges such as load, environmental changes, and aging, leading to problems such as pavement adhesion, damage, and dents.

[0003] Injecting new concrete into aging concrete pavements is currently the main solution, but the junction between the new and old concrete often suffers from problems such as weak bonding and weakened interfaces. Moreover, in complex construction environments, it is often difficult for the new and old concrete to fit completely together due to construction errors, and bubbles, cracks, and capillaries are easily formed at the interface. Even with the use of high-performance adhesives, their bonding and weather resistance may degrade due to factors such as temperature and humidity, wind and rain, and freeze-thaw, leading to local failure. At the same time, local stress concentration caused by traffic loads and temperature changes will cause microcracks to gradually expand and destroy the integrity of the structure. In addition, existing adhesive materials are difficult to simultaneously meet the requirements of high initial strength, weather resistance, and adaptive repair. Environmental variables during construction further limit their performance, making it difficult to stabilize the long-term quality of the project. Traditional interface bonding technology has been unable to meet the durability and stability requirements for long-term use. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a self-healing interface adhesive and a preparation method thereof to solve the above problems.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides a self-healing interface adhesive and a preparation method thereof. The adhesive comprises 90-110 parts of water, 8-12 parts of anhydrous ethanol, 50-70 parts of cement, 20-30 parts of mineral admixtures, 15-25 parts of polymer emulsion, 3-7 parts of silane coupling agent, 10-15 parts of nano-silicon dioxide, 5-12 parts of unsaturated amide, 8-12 parts of unsaturated acid, 4-7 parts of bio-glue, 5-8 parts of thixotropic agent, 3-6 parts of dispersant, and 3-6 parts of initiator;

[0007] The mineral admixture comprises silicon powder and rice husk powder in a mass ratio of 3:7, the polymer emulsion is vinyl acetate, the silane coupling agent is KH570, the unsaturated amide is acrylamide, and the unsaturated acid is acrylic acid.

[0008] Furthermore, the adhesive consists of 100 parts of water, 10 parts of anhydrous ethanol, 65 parts of cement, 25 parts of mineral admixtures, 20 parts of polymer emulsion, 5 parts of silane coupling agent, 12 parts of nano-silica, 8 parts of unsaturated amide, 8 parts of unsaturated acid, 5.5 parts of bio-glue, 6.5 parts of thixotropic agent, 4.5 parts of dispersant, and 4.5 parts of initiator.

[0009] Furthermore, the thixotropic agent is composed of calcium oxide and bentonite, the biological glue is xanthan gum, the dispersant is a fatty acid dispersant, and the initiator is ammonium persulfate.

[0010] Furthermore, a method for preparing a self-healing interface adhesive is also included, comprising the following steps:

[0011] S1. Grinding the bioglue into ultrafine powder, mixing with a silane coupling agent, and dispersing in anhydrous ethanol to obtain a dispersion;

[0012] S2, preparing an acid solution by using an unsaturated acid, then soaking the mineral admixture in the acid solution, washing, drying, and then calcining to obtain ash powder, adding the ash powder to the dispersion, dispersing it evenly, sealing it and letting it stand, and then spray drying it to obtain a modified tackifier;

[0013] S3, adding cement, nano-silica, and unsaturated amide to water, mixing and stirring evenly to obtain a mud;

[0014] S4, mixing the polymer emulsion with a thixotropic agent, a dispersant, a regulator, and an initiator and stirring them uniformly to obtain a slurry, and then mixing the mud with the slurry and stirring to obtain a pre-viscosity;

[0015] S5. In a non-oxidizing atmosphere, the pre-bonded body and the modified tackifier are polymerized to obtain interfacial bonding.

[0016] Furthermore, in step S2, the standing time is 20-24 hours.

[0017] Furthermore, in step S3, the stirring speed of the mud is 120-150 rpm / min, and the stirring time is 25-35 min.

[0018] Furthermore, in step S4, the stirring speed of the slurry is 200-300 rpm / min, and the stirring time is 25-35 min; the stirring speed of the mud and the slurry after mixing is 150-200 rpm / min, and the stirring time is 40-60 min.

[0019] Furthermore, in step S5, the polymerization reaction temperature is 40° C.-60° C., and the reaction time is 7 h-10 h.

[0020] Furthermore, in step S5, before the polymerization reaction, a corresponding amount of water may be added to adjust the viscosity of the interface adhesive.

[0021] The beneficial effects of the present invention are:

[0022] 1. In the present invention, during preparation, nano-silica can react with calcium hydroxide in cement to form calcium silicate gel, thereby enhancing the chemical bonding between new and old concrete; polymer emulsion can provide excellent flexibility and adhesion, absorb and disperse interfacial stress, and prevent interfacial cracking, and polymer emulsion and nano-silica can penetrate into tiny pores on the cement surface to form a mechanical lock and improve bonding strength; in addition, cement can be used as a basic bonding material to provide basic bonding properties, and silicon powder, rice husk powder, and nano-silica can significantly improve the density of the interfacial adhesive and reduce the penetration of moisture and other substances.

[0023] 2. In the present invention, the amide group is used to restrain water expansion in water, thereby reducing water bleeding and lowering the interparticle porosity; the unsaturated carboxylic acid used is adsorbed on the surface of cement particles through electrostatic attraction and calcium ion complexation, which can enhance the surface adsorption of cement particles.

[0024] 3. In the present invention, the prepared interface adhesive reacts with the concrete surface through chemical components to form a strong bonding layer, which can improve wear resistance and corrosion resistance. The interface adhesive can fill and seal defects on the concrete surface, enhancing adhesion and durability. In addition, the components inside the self-healing interface adhesive can undergo a secondary chemical reaction, closing cracks in cracked and damaged parts and reducing cracking.

[0025] 4. In the present invention, the prepared interface adhesive can significantly improve the bonding strength with concrete through physical penetration and chemical bonding, reducing the problems of hollowing and cracking; in addition, a dense protective layer can be formed on the surface of the interface adhesive, effectively preventing the intrusion of air and moisture, and improving the durability of concrete.

[0026] 5. In the present invention, the interface adhesive can be applied by spraying, rolling, brushing, etc., which is simple to operate and improves construction efficiency. In addition, the interface adhesive prepared by the present invention does not contain harmful substances, is harmless to the human body and the environment, meets environmental protection requirements, and has broad application prospects.

[0027] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the purpose, technical solutions and beneficial effects of the invention clearer, the present invention is described with the following drawings:

[0029] Figure 1 1. It is a process flow chart of the adhesive of the present invention. DETAILED DESCRIPTION

[0030] The invention provides a method for preparing a self-healing interface adhesive.

[0031] Example 1

[0032] S1. Grind 5.5 parts of bio-glue into ultrafine powder, mix with 5 parts of silane coupling agent, and disperse in 10 parts of anhydrous ethanol to obtain a dispersion;

[0033] S2. An acid solution was prepared by using 8 parts of acrylic acid, and then a mineral admixture consisting of 25 parts of silicon powder and rice husk powder was immersed in the acid solution, washed twice, dried, and calcined to obtain ash powder, which was added to the dispersion solution. After uniform dispersion, the mixture was sealed and allowed to stand for 22 hours, and then spray-dried to obtain a modified tackifier;

[0034] S3. Add 60 parts of cement, 12.5 parts of nano-silica, and 8 parts of acrylamide to 100 parts of water, stir at 135 rpm for 30 minutes, and mix thoroughly to obtain a mud;

[0035] S4, 20 parts of vinyl acetate, 6.5 parts of calcium oxide, a thixotropic agent composed of bentonite, 4.5 parts of fatty acid dispersant, and 4.5 parts of ammonium persulfate were stirred at 250 rpm / min for 27 minutes to obtain a slurry, and then the mud was mixed with the slurry and continued to stir at 175 rpm / min for 40-60 minutes to obtain a pre-viscosity;

[0036] S5. Under a non-oxidizing atmosphere, the pre-bonded body and the modified tackifier are subjected to a polymerization reaction at 50° C. for 8 hours to obtain an interface adhesive.

[0037] Example 2

[0038] S1. Grind 7 parts of bio-glue into ultrafine powder, mix with 3 parts of silane coupling agent, and disperse in 12 parts of anhydrous ethanol to obtain a dispersion;

[0039] S2. An acid solution was prepared by using 8 parts of acrylic acid, and then a mineral admixture consisting of 20 parts of silicon powder and rice husk powder was immersed in the acid solution, washed twice, dried, and calcined to obtain ash powder, which was added to the dispersion solution. After uniform dispersion, the mixture was sealed and allowed to stand for 22 hours, and then spray-dried to obtain a modified tackifier;

[0040] S3. Add 70 parts of cement, 10 parts of nano-silicon dioxide, and 12 parts of acrylamide to 90 parts of water, stir at 135 rpm for 30 minutes, and mix thoroughly to obtain a mud;

[0041] S4, 25 parts of vinyl acetate, 8 parts of calcium oxide, a thixotropic agent composed of bentonite, 3 parts of fatty acid dispersant, and 6 parts of ammonium persulfate were stirred at 250 rpm / min for 27 minutes to obtain a slurry, and then the mud was mixed with the slurry and continued to stir at 175 rpm / min for 40-60 minutes to obtain a pre-viscosity;

[0042] S5. Under a non-oxidizing atmosphere, the pre-bonded body and the modified tackifier are subjected to a polymerization reaction at 50° C. for 8 hours to obtain an interface adhesive.

[0043] The difference between Example 2 and Example 1 is that the raw material components are different, but both are within the scope of the present invention.

[0044] Example 3

[0045] S1. Grind 4 parts of bio-glue into ultrafine powder, mix with 7 parts of silane coupling agent, and disperse in 8 parts of anhydrous ethanol to obtain a dispersion;

[0046] S2. An acid solution was prepared by using 12 parts of acrylic acid, and then a mineral admixture consisting of 30 parts of silicon powder and rice husk powder was immersed in the acid solution, washed twice, dried, and calcined to obtain ash powder, which was added to the dispersion liquid. After uniform dispersion, the mixture was sealed and allowed to stand for 22 hours, and then spray-dried to obtain a modified tackifier;

[0047] S3. Add 50 parts of cement, 15 parts of nano-silicon dioxide, and 5 parts of acrylamide to 110 parts of water, stir at 135 rpm for 30 minutes, and mix thoroughly to obtain a mud;

[0048] S4, 15 parts of vinyl acetate, 5 parts of calcium oxide, a thixotropic agent consisting of bentonite, 6 parts of fatty acid dispersant, and 3 parts of ammonium persulfate were stirred at 250 rpm / min for 27 minutes to obtain a slurry, and then the mud was mixed with the slurry and continued to stir at 175 rpm / min for 40-60 minutes to obtain a pre-viscosity;

[0049] S5. Under a non-oxidizing atmosphere, the pre-bonded body and the modified tackifier are subjected to a polymerization reaction at 50° C. for 8 hours to obtain an interface adhesive.

[0050] The difference between Example 3 and Example 1 is that the raw material components are different, but all are within the scope of the present invention.

[0051] In order to demonstrate the superiority of the materials, proportions and methods of the present invention, comparative examples 1-4 are provided here.

[0052] Comparative Example 1

[0053] S1. Grind 10 parts of bio-glue into ultrafine powder, mix with 2 parts of silane coupling agent, and disperse in 20 parts of anhydrous ethanol to obtain a dispersion;

[0054] S2. An acid solution was prepared by using 18 parts of acrylic acid, and then 50 parts of a mineral admixture consisting of silicon powder and rice husk powder were immersed in the acid solution, washed twice, dried, and calcined to obtain ash powder, which was added to the dispersion solution. After uniform dispersion, the mixture was sealed and allowed to stand for 22 hours, and then spray-dried to obtain a modified tackifier;

[0055] S3, add 80 parts of cement, 5 parts of nano-silica, and 20 parts of acrylamide to 80 parts of water, stir at 135 rpm for 30 minutes, and mix well to obtain a mud;

[0056] S4, 10 parts of vinyl acetate, 12 parts of calcium oxide, a thixotropic agent consisting of bentonite, 8 parts of fatty acid dispersant, and 1 part of ammonium persulfate were stirred at 250 rpm / min for 27 minutes to obtain a slurry, and then the mud was mixed with the slurry and continued to stir at 175 rpm / min for 40-60 minutes to obtain a pre-viscosity;

[0057] S5. Under a non-oxidizing atmosphere, the pre-bonded body and the modified tackifier are subjected to a polymerization reaction at 50° C. for 8 hours to obtain an adhesive.

[0058] The difference between Comparative Example 1 and Example 1 is that the raw material components are not within the scope of the present invention.

[0059] Comparative Example 2

[0060] S1. Grind 5.5 parts of bio-glue into ultrafine powder, mix with 5 parts of silane coupling agent, and disperse in 10 parts of anhydrous ethanol to obtain a dispersion;

[0061] S2. An acid solution was prepared by using 8 parts of acrylic acid, and then a mineral admixture consisting of 25 parts of silicon powder and rice husk powder was immersed in the acid solution, washed twice, dried, and calcined to obtain ash powder, which was added to the dispersion solution. After uniform dispersion, the mixture was sealed and allowed to stand for 22 hours, and then spray-dried to obtain a modified tackifier;

[0062] S3. Add 60 parts of cement to 100 parts of water, stir at 135 rpm for 30 minutes, and mix well to obtain a mud;

[0063] S4, 20 parts of vinyl acetate, 6.5 parts of calcium oxide, a thixotropic agent composed of bentonite, 4.5 parts of fatty acid dispersant, and 4.5 parts of ammonium persulfate were stirred at 250 rpm / min for 27 minutes to obtain a slurry, and then the mud was mixed with the slurry and continued to stir at 175 rpm / min for 40-60 minutes to obtain a pre-viscosity;

[0064] S5. Under a non-oxidizing atmosphere, the pre-bonded body and the modified tackifier are subjected to a polymerization reaction at 50° C. for 8 hours to obtain an adhesive.

[0065] The difference between Comparative Example 2 and Example 1 is that no unsaturated amide and nano-silica are added, and the rest is the same as Example 1.

[0066] Comparative Example 3

[0067] S1. Grind 5.5 parts of bio-glue into ultrafine powder, mix with 5 parts of silane coupling agent, and disperse in 10 parts of anhydrous ethanol to obtain a dispersion;

[0068] S2. An acid solution was prepared by using 8 parts of acrylic acid, and then a mineral admixture consisting of 25 parts of silicon powder and rice husk powder was immersed in the acid solution, washed twice, dried, and calcined to obtain ash powder, which was added to the dispersion solution. After uniform dispersion, the mixture was sealed and allowed to stand for 22 hours, and then spray-dried to obtain a modified tackifier;

[0069] S3. Add 60 parts of cement, 12.5 parts of nano-silica, and 8 parts of acrylamide to 100 parts of water, stir at 135 rpm for 30 minutes, and mix thoroughly to obtain a mud;

[0070] S4. Under a non-oxidizing atmosphere, the mud and the modified tackifier are subjected to a polymerization reaction at 50° C. for 8 hours to obtain a binder.

[0071] The difference between Comparative Example 3 and Example 1 is that no slurry is prepared, and the rest is the same as Example 1.

[0072] Comparative Example 4

[0073] S1, grinding 5.5 parts of bio-glue into ultrafine powder, and uniformly mixing with 5 parts of silane coupling agent, 8 parts of acid solution prepared from acrylic acid, 25 parts of silicon powder, mineral admixture consisting of rice husk powder, 100 parts of water, 60 parts of cement, 12.5 parts of nano-silicon dioxide, 8 parts of acrylamide, 20 parts of vinyl acetate, 6.5 parts of calcium oxide, a thixotropic agent consisting of bentonite, 4.5 parts of fatty acid dispersant, and 4.5 parts of ammonium persulfate to obtain a mixture;

[0074] S2. In a non-oxidizing atmosphere, the mixture is reacted at 50° C. for 8 hours to obtain a binder.

[0075] Fourteen gapped concrete blocks with the same conditions were set up, and new concrete was applied to the gaps. The concrete blocks were divided into seven groups. The interface joints of each group of concrete were respectively applied with the interface adhesives of Examples 1 to 3 and the adhesives of Comparative Examples 1 to 4. After 72 hours of natural air drying, the properties of the concrete blocks were tested. The results are shown in Table 1.

[0076]

[0077]

[0078]

[0079]

[0080] As shown in Table 1, the interface adhesives of Example 3 of the present invention were injected into the new concrete interface joints, and the interfaces were effectively bonded. The surfaces showed no significant loss after exposure to natural conditions, and had good weather resistance. However, the raw material components of the adhesive of Comparative Example 1 were not within the scope of the present invention. The adhesive prepared cracked after a period of time, had insufficient fluidity, and had a damaged appearance. The adhesive of Comparative Example 2 had insufficient strength, collapsed at the interface joints, and separated from the original concrete interface. The adhesive of Comparative Example 3 had insufficient fluidity and was easily crushed after application to the interface joints. It was brittle and had insufficient strength. The adhesive of Comparative Example 4 did not give the reaction materials sufficient reaction time, so the resulting adhesive had insufficient bonding performance, could not effectively bond to the concrete, and had insufficient strength. It suffered severe loss after exposure to natural environments, and had a poor appearance.

[0081] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A self-healing interface adhesive, characterized in that: The adhesive comprises, by weight, 90-110 parts of water, 8-12 parts of anhydrous ethanol, 50-70 parts of cement, 20-30 parts of mineral admixtures, 15-25 parts of polymer emulsion, 3-7 parts of silane coupling agent, 10-15 parts of nano-silicon dioxide, 5-12 parts of unsaturated amide, 8-12 parts of unsaturated acid, 4-7 parts of bio-glue, 5-8 parts of thixotropic agent, 3-6 parts of dispersant, and 3-6 parts of initiator; The mineral admixture comprises silicon powder and rice husk powder in a mass ratio of 3:7, the polymer emulsion is vinyl acetate, the silane coupling agent is KH570, the unsaturated amide is acrylamide, and the unsaturated acid is acrylic acid.

2. The self-healing interface adhesive according to claim 1, characterized in that: The adhesive consists of 100 parts of water, 10 parts of anhydrous ethanol, 65 parts of cement, 25 parts of mineral admixture, 20 parts of polymer emulsion, 5 parts of silane coupling agent, 12 parts of nano-silicon dioxide, 8 parts of unsaturated amide, 8 parts of unsaturated acid, 5.5 parts of bio-glue, 6.5 parts of thixotropic agent, 4.5 parts of dispersant and 4.5 parts of initiator in parts by weight.

3. The self-healing interface adhesive according to claim 2, characterized in that: The thixotropic agent consists of calcium oxide and bentonite, the biological glue is xanthan gum, the dispersant is a fatty acid dispersant, and the initiator is ammonium persulfate.

4. The self-healing interface adhesive according to any one of claims 1 to 3, further comprising a method for preparing the self-healing interface adhesive, characterized in that: The following steps are included: S1. Grinding the bioglue into ultrafine powder, mixing with a silane coupling agent, and dispersing in anhydrous ethanol to obtain a dispersion; S2, preparing an acid solution by using an unsaturated acid, then soaking the mineral admixture in the acid solution, washing, drying, and then calcining to obtain ash powder, adding the ash powder to the dispersion, dispersing it evenly, sealing it and letting it stand, and then spray drying it to obtain a modified tackifier; S3, adding cement, nano-silica, and unsaturated amide to water, mixing and stirring evenly to obtain a mud; S4, mixing the polymer emulsion with a thixotropic agent, a dispersant, a regulator, and an initiator and stirring them uniformly to obtain a slurry, and then mixing the mud with the slurry and stirring to obtain a pre-viscosity; S5. In a non-oxidizing atmosphere, the pre-bonded body and the modified tackifier are polymerized to obtain an interface adhesive.

5. The method for preparing a self-healing interface adhesive according to claim 4, characterized in that: In step S2, the standing time is 20-24 hours.

6. The method for preparing a self-healing interface adhesive according to claim 4, characterized in that: In step S3, the stirring speed of the mud is 120-150 rpm / min, and the stirring time is 25-35 min.

7. The method for preparing a self-healing interface adhesive according to claim 4, characterized in that: In step S4, the stirring speed of the slurry is 200-300 rpm / min, and the stirring time is 25-35 min; the stirring speed of the mud and slurry after mixing is 150-200 rpm / min, and the stirring time is 40-60 min.

8. The method for preparing a self-healing interface adhesive according to claim 4, characterized in that: In step S5, the polymerization reaction temperature is 40° C.-60° C., and the reaction time is 7 h-10 h.

9. The method for preparing a self-healing interface adhesive according to claim 4, characterized in that: In step S5, before the polymerization reaction, a corresponding amount of water may be added to adjust the viscosity of the interface adhesive.

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