Self-repairing interface binder based on artificial aggregate and preparation method of self-repairing interface binder

Abstract

The invention discloses a self-repairing interface binder based on artificial aggregate and a preparation method of the self-repairing interface binder, and belongs to the technical field of binder preparation. The binding agent is prepared from 60 to 80 parts of epoxy resin, 45 to 60 parts of aggregate, 45 to 60 parts of filler, 20 to 30 parts of polymeric material, 10 to 15 parts of polyurethane, 8 to 14 parts of polysulfide rubber, 10 to 16 parts of organic binding material, 10 to 15 parts of silane coupling agent, 3 to 5 parts of hardening agent, 5 to 8 parts of plasticizer, 5 to 8 parts of surfactant and 5 to 10 parts of diluent. The self-repairing interface binder disclosed by the invention has excellent bonding strength and can effectively repair concrete cracks; good water resistance, corrosion resistance and aging resistance are achieved, and the bonding effect can be kept for a long time; as the binder has good flowability and operability, the construction is easy; the device can be suitable for repairing concrete cracks with different widths and depths and concrete structures under different environmental conditions; the paint is nontoxic and harmless, has no pungent smell, does not cause pollution, and meets the environmental protection standard.

Description

Technical Field

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

[0002] In modern society, concrete is an essential building material for both highway and housing construction. However, over time, concrete structures are susceptible to erosion from natural conditions such as heavy rain, intense sunlight, and heavy pressure, resulting in cracking, fractures, and shattering. These problems can severely impact daily transportation and work. If not promptly controlled or repaired, they can lead to casualties and significant damage to people's lives and property. Completely replacing concrete is a waste of time, money, and resources, and can also disrupt public transportation.

[0003] Currently, concrete repair primarily involves filling dents and damaged areas with epoxy resin-based adhesives or polymer-modified cement mortars. While these materials offer high initial bond strength, they suffer from poor durability, mismatched thermal expansion coefficients, and high environmental sensitivity. Especially when applied to the interface between new and old concrete, differences in hydration levels can lead to a weak interface transition and a tendency to secondary cracking due to temperature and humidity cycles. Other crack-filling methods, such as injecting microbial repair agents or pre-embedded fiberglass tubes, have also been hindered by high raw material costs and complex processes, hindering widespread adoption.

[0004] Currently developed microcapsule technology (with an epoxy resin core) can autonomously repair tiny cracks, but it suffers from limitations such as a limited number of repair cycles and reduced mechanical properties. Crystallized precipitation-based repair agents, while capable of multiple repairs, require a continuous supply of water for activation. These technical bottlenecks severely restrict the application of self-healing materials in concrete interface repair. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a self-repairing interface adhesive based on artificial aggregate and a preparation method thereof to solve the above problems.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a self-repairing interface adhesive based on artificial aggregate and a preparation method thereof. The adhesive comprises, by weight, 60-80 parts of epoxy resin, 45-60 parts of aggregate, 45-60 parts of filler, 20-30 parts of polymer material, 10-15 parts of polyurethane, 8-14 parts of polysulfide rubber, 10-14 parts of organic binder, 10-15 parts of silane coupling agent, 3-5 parts of hardener, 5-8 parts of plasticizer, 5-8 parts of surfactant, and 5-10 parts of diluent.

[0008] The filler is composed of quartz powder, talc powder and white carbon black; the diluent is acetone;

[0009] The organic binder is a water-soluble organic binder, specifically a mixture of two or more of sodium carboxymethyl cellulose, starch alkali binder, polyvinyl alcohol binder, urea-formaldehyde binder, and polyvinyl formal binder;

[0010] The aggregate is a combination of cement and two or more of fly ash, volcanic ash, slag powder, pumice powder, zeolite powder, and perlite powder, and the cement accounts for more than 10% of the total mass of the aggregate;

[0011] The polymer material consists of hydroxypropyl emulsion and aliphatic polyisocyanate.

[0012] Furthermore, the adhesive is composed of 70 parts of epoxy resin, 52 parts of aggregate, 52 parts of filler, 25 parts of polymer material, 12.5 parts of polyurethane, 11 parts of polysulfide rubber, 12 parts of organic binder, 12.5 parts of silane coupling agent, 4 parts of hardener, 6.5 parts of plasticizer, and 6.5 parts of surfactant.

[0013] Furthermore, the mass ratio of the quartz powder, talcum powder and white carbon black is 1:1:1.

[0014] Furthermore, the plasticizer is at least one of tricresyl phosphate and toluene diphenyl phosphate; the surfactant is lignosulfonate; and the hardener is isophorone diamine.

[0015] Furthermore, a method for preparing a self-repairing interface adhesive based on artificial aggregate is also included, comprising the following steps:

[0016] S1. Mixing epoxy resin, polyurethane and filler to prepare base material 1;

[0017] S2, mixing base material 1 with aggregate and 1 / 2 of the polymer material, and adding organic binder under stirring to obtain base material 2;

[0018] S3, take polysulfide rubber and base material 2 and mix them, then add silane coupling agent, plasticizer, surfactant and 1 / 2 polymer material in sequence and mix them evenly to obtain a pre-bonded body;

[0019] S4. Continue to add hardener and diluent to the pre-bonded body and stir evenly to obtain a self-repairing interface adhesive.

[0020] Furthermore, in step S2, the stirring rate before adding the organic binder is 80-100 rpm / min, and the stirring time is 10-15 min; after adding the organic binder, the stirring rate is increased to 120-150 rpm / min, and the stirring time is 5-10 min.

[0021] Furthermore, in step S3, the stirring rate when mixing the polysulfide rubber and the base material 2 is 60-80 rpm / min, and the stirring time is 10-15 min; the stirring rate after adding the silane coupling agent, plasticizer, surfactant, and 1 / 2 polymer material is 80-100 rpm / min, and the stirring time is 10-15 min.

[0022] Furthermore, in step S4, the stirring rate is 80-100 rpm / min, and the stirring time is 20-30 min.

[0023] The beneficial effects of the present invention are:

[0024] 1. The epoxy resin of the present invention, as the main component of the adhesive, has good bonding strength and durability. Polyurethane combines with epoxy resin to form an interpenetrating polymer network (IPN) structure, which improves the strength and toughness of the adhesive, giving the adhesive better mechanical properties and toughness, and adapting to deformation of concrete cracks. The addition of a silane coupling agent improves the bonding performance of the epoxy resin to the concrete surface, the plasticizer improves the flexibility and workability of the adhesive, and the filler increases the volume of the adhesive, also reducing costs. The curing agent can promote the curing reaction of the epoxy resin. The aggregate, as the base material of the adhesive, provides the necessary strength and durability, and enhances the filling and mechanical strength of the adhesive. The polymeric material further provides excellent adhesion and flexibility. The hardener, diluent, etc. can adjust the viscosity, fluidity, and drying speed of the adhesive.

[0025] 2. The present invention achieves bonding through chemical bonding: epoxy resin reacts chemically with the hydroxyl groups on the concrete surface to form a strong chemical bond; physical interlocking: the filler particles in the adhesive are embedded in the cracks of the concrete to form a physical interlocking, thereby enhancing the bonding strength and giving the adhesive better mechanical properties and toughness, adapting to the deformation of the concrete cracks.

[0026] 3. The self-repairing interface adhesive of the present invention has a penetrating effect. The active ingredients in the adhesive can penetrate into the micropores and capillaries of concrete cracks, reduce surface tension, and make the concrete surface more moist. The high molecular polymer in the adhesive can wet the concrete surface, improve the water absorption and adhesion of the concrete surface. The high molecular polymer in the adhesive chemically bonds with the concrete surface and physically adsorbs to form a strong bonding layer. The polymer materials are entangled and interpenetrated on the concrete surface to form a network structure, further enhancing the bonding strength.

[0027] 4. The self-repairing interface adhesive prepared by the present invention has excellent bonding strength, which enhances the interfacial bonding strength between the adhesive and the concrete, effectively repairing concrete cracks; it also has good water resistance, corrosion resistance and aging resistance, and can maintain the bonding effect for a long time; because the adhesive has good fluidity and operability, it is easy to construct, and injection or pressure grouting can be used to repair cracks; it has strong adaptability and can be applied to concrete cracks of different widths and depths, as well as concrete structure repairs under different environmental conditions; it is non-toxic and harmless, has no irritating odor, will not cause pollution, and meets environmental protection standards.

[0028] 5. The self-repairing interface adhesive of the present invention has excellent bonding properties, weather resistance and construction performance, and can effectively bond concrete cracks, broken pieces, and improve the overall strength and stability of the concrete structure.

[0029] 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

[0030] In order to make the purpose, technical solutions and beneficial effects of the invention clearer, the present invention is described with the following drawings:

[0031] Figure 1 This is a flow chart for preparing the self-repairing interface adhesive of the present invention. DETAILED DESCRIPTION

[0032] like Figure 1 As shown, the present invention provides a method for preparing a self-repairing interface adhesive based on artificial aggregate.

[0033] Example 1

[0034] S1. Mix 52 parts of a filler consisting of quartz powder, talc powder, and white carbon black, 70 parts of an epoxy resin, and 12.5 parts of a polyurethane to prepare a base material 1;

[0035] S2. Mixing base material 1 with 52 parts of aggregate consisting of cement, volcanic ash, and slag powder (cement accounts for 40% of the total mass of the aggregate, and volcanic ash and slag powder each account for 30%), and 12.5 parts of a polymeric material consisting of hydroxypropyl emulsion and aliphatic polyisocyanate, and adding 14 parts of an organic binder consisting of sodium carboxymethyl cellulose and a starch-based binder under stirring to obtain base material 2;

[0036] S3, take 11 parts of polysulfide rubber and mix it with base material 2, then add 12.5 parts of silane coupling agent, 6.5 parts of toluene diphenyl phosphate, 6.5 parts of surfactant, 12.5 parts of a polymer material consisting of hydroxypropyl emulsion and aliphatic polyisocyanate in sequence and mix them evenly to obtain a pre-bonded body;

[0037] S4. Continue to add 4.5 parts of isophorone diamine and 7.5 parts of acetone to the pre-bonded body and stir evenly to obtain a self-repairing interface adhesive.

[0038] Example 2

[0039] S1. Mix 60 parts of a filler consisting of quartz powder, talc powder, and white carbon black, 60 parts of an epoxy resin, and 10 parts of a polyurethane to prepare a base material 1;

[0040] S2. Mixing base material 1 with 45 parts of aggregate consisting of cement, volcanic ash, and slag powder (cement accounts for 60% of the total mass of the aggregate, and volcanic ash and slag powder each account for 20%), and 15 parts of a polymer material consisting of hydroxypropyl emulsion and aliphatic polyisocyanate, and adding 14 parts of an organic binder consisting of sodium carboxymethyl cellulose and a starch-based binder under stirring to obtain base material 2;

[0041] S3, take 8 parts of polysulfide rubber and mix it with base material 2, then add 15 parts of silane coupling agent, 8 parts of toluene diphenyl phosphate, a surfactant, and 10 parts of a polymer material consisting of hydroxypropyl emulsion and aliphatic polyisocyanate in sequence and mix them evenly to obtain a pre-bonded body;

[0042] S4. Continue to add 3 parts of isophorone diamine and 10 parts of acetone to the pre-bonded body and stir evenly to obtain a self-repairing interface adhesive.

[0043] The difference between Example 2 and Example 1 is that the content of each component is changed within the scope of the present invention, and the prepared self-repairing interface adhesive is relatively thin and thick.

[0044] Comparative Example 3

[0045] S1. Mix 45 parts of a filler consisting of quartz powder, talc powder, and white carbon black, 80 parts of an epoxy resin, and 15 parts of a polyurethane to prepare a base material 1;

[0046] S2. Mixing base material 1 with 60 parts of aggregate consisting of fly ash, cement, and slag powder (cement accounts for 30% of the total mass of the aggregate, fly ash accounts for 40%, and slag powder accounts for 30% each), and 10 parts of a polymeric material consisting of hydroxypropyl emulsion and aliphatic polyisocyanate, and adding 16 parts of an organic binder consisting of sodium carboxymethyl cellulose and a starch alkaline binder under stirring to obtain base material 2;

[0047] S3, take 14 parts of polysulfide rubber and mix it with base material 2, then add 12.5 parts of silane coupling agent, 5 parts of toluene diphenyl phosphate, 5 parts of surfactant, and 15 parts of a polymer material composed of hydroxypropyl emulsion and aliphatic polyisocyanate in sequence and mix them evenly to obtain a pre-bonded body;

[0048] S4. Continue to add 5 parts of isophorone diamine and 5 parts of acetone to the pre-bonded body and stir evenly to obtain a self-repairing interface adhesive.

[0049] The difference between Example 2 and Example 1 is that the content of each component is changed within the scope of the present invention, and the prepared self-repairing interface adhesive is relatively thick.

[0050] In order to demonstrate the superiority of the raw materials, proportions and methods of the present invention, comparative examples 1 to 3 are provided here.

[0051] Comparative Example 1

[0052] S1. Mix 52 parts of a filler consisting of quartz powder, talc powder, and white carbon black with 12.5 parts of polyurethane to prepare base material 1;

[0053] S2. Mixing base material 1 with 52 parts of aggregate consisting of cement, volcanic ash, and slag powder (cement accounts for 40% of the total mass of the aggregate, and volcanic ash and slag powder each account for 30%) and 12.5 parts of a polymeric material consisting of hydroxypropyl emulsion and aliphatic polyisocyanate to obtain base material 2;

[0054] S3, then add 12.5 parts of silane coupling agent, 6.5 parts of toluene diphenyl phosphate, 6.5 parts of surfactant, 12.5 parts of a polymer material consisting of hydroxypropyl emulsion and aliphatic polyisocyanate to the base material 2 in sequence and mix them evenly to obtain a pre-bonded body;

[0055] S4. Add 4.5 parts of isophorone diamine and 7.5 parts of acetone to the pre-bonded body and stir evenly to obtain an adhesive.

[0056] The difference between Comparative Example 1 and Example 1 is that no epoxy resin, organic binder, or polysulfide rubber is added, and the resulting adhesive has insufficient bonding performance and is prone to cracking.

[0057] Comparative Example 2

[0058] S1. Mix 70 parts of a filler consisting of quartz powder, talc powder, and white carbon black, 100 parts of an epoxy resin, and 5 parts of a polyurethane to prepare a base material 1;

[0059] S2. Mixing base material 1 with 30 parts of aggregate consisting of cement, volcanic ash, and slag powder (cement accounts for 40% of the total mass of the aggregate, and volcanic ash and slag powder each account for 30%), and 5 parts of a polymer material consisting of hydroxypropyl emulsion and aliphatic polyisocyanate, and adding 3 parts of an organic binder consisting of sodium carboxymethyl cellulose and a starch-based binder under stirring to obtain base material 2;

[0060] S3, take 25 parts of polysulfide rubber and mix it with base material 2, then add 4 parts of silane coupling agent, 15 parts of toluene diphenyl phosphate, 15 parts of surfactant, and 10 parts of a polymer material composed of hydroxypropyl emulsion and aliphatic polyisocyanate in sequence and mix them evenly to obtain a pre-bonded body;

[0061] S4. Add 10 parts of isophorone diamine and 15 parts of acetone to the pre-bonded body and stir evenly to obtain an adhesive.

[0062] The difference between Comparative Example 2 and Example 1 is that the components of each material are not within the scope of the present invention, and the resulting adhesive is insufficient in strength. It can be bonded initially, but cracks after a natural reaction time.

[0063] Comparative Example 3

[0064] S1. Mix 52 parts of filler consisting of quartz powder, talc powder, and white carbon black, 70 parts of epoxy resin, 12.5 parts of polyurethane, 52 parts of aggregate consisting of cement, volcanic ash, and slag powder (cement accounts for 40% of the total mass of the aggregate, and volcanic ash and slag powder each account for 30%), 25 parts of a polymer material consisting of hydroxypropyl emulsion and aliphatic polyisocyanate, 11 parts of polysulfide rubber, 12.5 parts of a silane coupling agent, 6.5 parts of toluene diphenyl phosphate, 6.5 parts of a surfactant, 4.5 parts of isophorone diamine, and 7.5 parts of acetone to obtain a binder.

[0065] The difference between Comparative Example 3 and Example 1 is that the method of the present invention is not adopted, and sufficient reaction time is not given to each material. All materials are directly mixed, and the performance of the obtained adhesive is poor.

[0066] Twelve concrete blocks with the same cracks (crack blocks) and 12 separated crack blocks were selected. The crack blocks were randomly divided into 6 groups, with 2 blocks in each group. The 12 separated crack blocks (separated blocks) were divided into 6 groups in pairs. The self-repairing interface adhesives of Examples 1 to 3 and the adhesives of Comparative Examples 1 to 3 were used for bonding, respectively. The blocks were placed in a natural environment and exposed to rain, light, fly ash, etc. After 72 hours, the bonding performance was observed. The results are shown in Table 1:

[0067] Table 1

[0068]

[0069]

[0070]

[0071] As can be seen from the above table, the self-repairing interface adhesives prepared in Examples 1 to 3 are effectively bonded to cracked blocks and separated blocks. Even after reacting in the natural environment, their strength, bonding properties, and surface remain unchanged, effectively repairing the separation of concrete cracks and cracks, and maintaining stable performance under various environmental conditions. However, the adhesive of Comparative Example 1 is used for cracks and fractures of cracked blocks, and has insufficient bonding and fluidity. It is easily crushed when touched after drying. After reacting in natural conditions, the surface ash is high, and the material is prone to ash loss, which is not suitable for the construction environment. The adhesive of Comparative Example 2 is used for cracks and fractures of cracked blocks, and has insufficient bonding and strength. After drying, there are depressions in the cracks or fractures, and the appearance collapses. The adhesive of Comparative Example 3 does not give each material sufficient reaction time. After being used for cracks and fractures of cracked blocks, it has insufficient bonding properties, has cracks, and some material particles are more obvious, and cannot effectively adhere to cracks and cracks.

[0072] 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-repairing interface adhesive based on artificial aggregate, characterized by: The binder is composed of 60-80 parts of epoxy resin, 45-60 parts of aggregate, 45-60 parts of filler, 20-30 parts of polymer material, 10-15 parts of polyurethane, 8-14 parts of polysulfide rubber, 10-16 parts of organic binder, 10-15 parts of silane coupling agent, 3-5 parts of hardener, 5-8 parts of plasticizer, 5-8 parts of surfactant, and 5-10 parts of diluent in parts by weight; The filler is composed of quartz powder, talc powder and white carbon black; the diluent is acetone; The organic binder is a water-soluble organic binder, specifically a mixture of two or more of sodium carboxymethyl cellulose, starch alkali binder, polyvinyl alcohol binder, urea-formaldehyde binder, and polyvinyl formal binder; The aggregate is a combination of cement and two or more of fly ash, volcanic ash, slag powder, pumice powder, zeolite powder, and perlite powder, and the cement accounts for more than 10% of the total mass of the aggregate; The polymer material consists of hydroxypropyl emulsion and aliphatic polyisocyanate.

2. The self-repairing interface adhesive based on artificial aggregate according to claim 1, characterized in that: The adhesive consists of 70 parts of epoxy resin, 52 parts of aggregate, 52 parts of filler, 25 parts of polymer material, 12.5 parts of polyurethane, 11 parts of polysulfide rubber, 14 parts of organic binder, 12.5 parts of silane coupling agent, 4 parts of hardener, 6.5 parts of plasticizer, and 6.5 parts of surfactant.

3. The self-repairing interface adhesive based on artificial aggregate according to claim 1, characterized in that: The mass ratio of the quartz powder, talc powder and white carbon black is 1:1:

1.

4. The self-repairing interface adhesive based on artificial aggregate according to claim 1, characterized in that: The plasticizer is at least one of tricresyl phosphate and toluene diphenyl phosphate; the surfactant is lignosulfonate; and the hardener is isophorone diamine.

5. The self-repairing interface adhesive based on artificial aggregate according to any one of claims 1 to 4, further comprising a method for preparing the self-repairing interface adhesive based on artificial aggregate, characterized in that: The following steps are included: S1. Mixing epoxy resin, polyurethane and filler to prepare base material 1; S2, mixing base material 1 with aggregate and 1 / 2 of the polymer material, and adding organic binder under stirring to obtain base material 2; S3, take polysulfide rubber and base material 2 and mix them, then add silane coupling agent, plasticizer, surfactant, and 1 / 2 polymer material in sequence and mix them evenly to obtain a pre-bonded body; S4. Continue to add hardener and diluent to the pre-bonded body and stir evenly to obtain a self-repairing interface adhesive.

6. The method for preparing a self-repairing interface adhesive based on artificial aggregate according to claim 5, characterized in that: In the step S1, the stirring speed is 80-100 rpm / min and the stirring time is 30-50 min.

7. The method for preparing a self-repairing interface adhesive based on artificial aggregate according to claim 5, characterized in that: In the step S2, the stirring rate before adding the organic binder is 80-100 rpm / min, and the stirring time is 10-15 min; after adding the organic binder, the stirring rate is increased to 120-150 rpm / min, and the stirring time is 5-10 min.

8. The method for preparing a self-repairing interface adhesive based on artificial aggregate according to claim 5, characterized in that: In step S3, the stirring rate when the polysulfide rubber is mixed with the base material 2 is 60-80 rpm / min, and the stirring time is 10-15 minutes; the stirring rate after adding the silane coupling agent, plasticizer, surfactant, and 1 / 2 of the polymer material is 80-100 rpm / min, and the stirring time is 10-15 minutes.

9. The method for preparing a self-repairing interface adhesive based on artificial aggregate according to claim 5, characterized in that: In step S4, the stirring rate is 80-100 rpm / min, and the stirring time is 20-30 min.

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