An interface treating agent for a steel structure surface and a preparation method thereof

Abstract

The application discloses a preparation method of an interface treatment agent for a steel structure, and comprises the following steps: adding graphene powder and boron nitride powder into a mixed solution composed of ethanol and water, performing ultrasonic treatment, then centrifuging the mixed solution, collecting supernatant, drying the supernatant, and obtaining graphene nanosheet / boron nitride nanosheet composite material; mixing and stirring polydimethylsiloxane, dibutyltin dilaurate and the graphene nanosheet / boron nitride nanosheet composite material, adding polyacrylate emulsion, and performing stirring treatment to obtain modified polyacrylate emulsion; mixing cement, redispersible latex powder, river sand, defoaming agent, triethanolamine and hydroxyethyl methyl cellulose as dry material components; and taking the modified polyacrylate emulsion as a liquid component. The interface treatment agent can not only effectively improve the interface performance between the steel structure and mortar, but also improve the corrosion resistance and weather resistance of the surface of the steel structure.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to an interface treatment agent for steel structure surfaces and its preparation method. Background Technology

[0002] Steel structures and cement mortar are key materials commonly used in construction engineering. The bonding problem between them has long plagued construction experts, especially with the continuous development of prefabricated buildings. However, due to the significant differences in the physical and chemical properties of the two materials, the adhesion between them is difficult to guarantee, easily leading to failure. This failure can cause structural instability, cracks, loosening, and other problems, posing a threat to building safety. To solve this long-standing industry problem, engineers have discovered a special chemical agent—an interface treatment agent. This agent effectively improves the adhesion between the steel structure and cement mortar, forming a dense coating that enhances the stability and safety of the building structure. By increasing the contact area and adhesion between the steel structure and cement mortar, the interface treatment agent significantly improves the bonding effect between the two materials, making the adhesion stronger. After applying the interface treatment agent, the coating formed on the steel structure surface significantly improves the adhesion and durability of the cement mortar, effectively solving the interface adhesion problem.

[0003] Currently, interface treatment agents are widely used in the construction industry and have become one of the important technical means to improve the safety and stability of building structures. Interface treatment agents are environmentally friendly materials with bidirectional affinity, formulated from various high-molecular polymers and special cements. The products are available in single-component and two-component forms; the single-component is a dry powder, while the two-component is a mixture of liquid and powder. Interface treatment agents can firmly bond to the substrate, while the surface can also be well bonded to new adhesives. Patent application CN202111097315.9 discloses an interface agent for steel structure exterior walls, comprising a liquid component A and a powder component B. The liquid component A is a pure acrylic emulsion and / or a styrene-acrylic emulsion; the solid content of the liquid component A is 20-60%. The powder component B comprises the following components in parts by weight: cement: 200-700 parts; sand: 200-800 parts; water-repellent agent: 0.3-3.0 parts; defoamer: 0.1-2.0 parts; cellulose ether: 0.2-2.5 parts; the mass ratio of liquid component A to powder component B is 1:(2.5-4.5). The interface agent in this invention effectively ensures adhesion to the surface of the steel structure substrate with an anti-corrosion coating, exhibits stronger synergistic strain capability with the steel structure under stress or temperature changes, higher tensile bond strength, and better durability. As can be seen from the above prior art, existing interface treatment agents focus on solving the adhesion performance with steel structures, with relatively little research on the functionality of interface treatment agents. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an interface treatment agent for steel structures and its preparation method, which can not only effectively improve the interface performance between steel structures and mortar, but also improve the corrosion resistance and weather resistance of the steel structure surface.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0006] A method for preparing an interface treatment agent for steel structures includes the following steps:

[0007] (1) Add graphene powder and boron nitride powder to a mixture of ethanol and water, sonicate, centrifuge the mixture after treatment, collect the supernatant, and dry the supernatant directly to obtain graphene nanosheet / boron nitride nanosheet composite material.

[0008] (2) Polydimethylsiloxane, dibutyltin dilaurate and the graphene nanosheet / boron nitride nanosheet composite material prepared above are mixed and stirred, and then polyacrylate emulsion is added and stirred again to obtain modified polyacrylate emulsion.

[0009] (3) Cement, redispersible latex powder, river sand, defoamer, triethanolamine and hydroxyethyl methyl cellulose are mixed evenly as dry material components; the modified polyacrylate emulsion prepared above is used as liquid component.

[0010] As a preferred embodiment of the above technical solution, in step (1), the mass ratio of graphene powder to boron nitride powder is 1:1, the volume ratio of ethanol to water is 1:1, and the solid content in the mixture is 2%.

[0011] As a preferred embodiment of the above technical solution, in step (1), the power of ultrasonic treatment is 500W and the time is 30-60min; the speed of centrifugation treatment is 4000-5000rpm and the time is 30min.

[0012] As a preferred embodiment of the above technical solution, in step (2), the solid content of the polyacrylate emulsion is 35-40%, and the mass ratio of the polydimethylsiloxane, dibutyltin dilaurate, graphene nanosheets / boron nitride nanosheets, and polyacrylate emulsion is 6:0.01:(2-3):100.

[0013] As a preferred embodiment of the above technical solution, in step (2), the mixing speed is 3000-5000 r / min and the time is 30 min, and the stirring speed is 10000 r / min and the time is 5-10 min.

[0014] As a preferred embodiment of the above technical solution, in step (3), the cement is 42.5 ordinary silicate cement, the particle size of the river sand is 80-100 mesh, the defoamer is an organosilicon defoamer, and the viscosity of the hydroxyethyl methyl cellulose is 7000-40000 mPa·s.

[0015] As a preferred embodiment of the above technical solution, in step (3), the amount of each component in the dry material component by weight is as follows: 100-300 parts of cement, 80-100 parts of redispersible latex powder, 300-400 parts of river sand, 0.5-1 parts of defoamer, 0.2-0.5 parts of triethanolamine, and 1-2 parts of hydroxyethyl methylcellulose.

[0016] As a preferred embodiment of the above technical solution, in step (3), the mass ratio of the dry component to the liquid component is (2-3):1.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0018] The interface treatment agent provided by this invention is easy to store, has simple components, and is inexpensive. By effectively adjusting the dosage of each component, this invention produces an interface treatment agent that effectively improves the interfacial properties between the steel structure and the mortar, giving the steel structure surface excellent corrosion resistance.

[0019] The modified polyacrylate emulsion provided by this invention is modified with graphene nanosheets / boron nitride nanosheets and polydimethylsiloxane. The modified polyacrylate emulsion exhibits excellent compatibility with the cement matrix, thereby improving the matrix properties, aging resistance, and corrosion resistance of the matrix. The intercalation composite of graphene nanosheets / boron nitride nanosheets in this invention effectively improves its dispersibility, and the high hardness and strength of the boron nitride nanosheets can effectively improve the strength and corrosion resistance of the interface treatment agent. The surface activity of the boron nitride nanosheets can also effectively improve the adhesion between cement and other materials. Furthermore, the boron nitride nanosheets can effectively promote the dispersion, dissolution, and reaction of cement particles in water, thus contributing to a more complete and rapid hydration reaction in the cement, improving the performance of the coating. Graphene nanosheets can significantly improve the strength of the interface treatment agent and also improve its high-temperature resistance. The surface of the graphene nanosheets has good dispersibility and adhesion, effectively enhancing the solid-liquid / solid-gas adhesion between the cement matrix and the reinforcing steel. Graphene nanosheets, as a material resistant to chemical corrosion, can be added to interface treatment agents to prevent corrosion and damage to steel structural components from the external environment, thus extending their service life. Polydimethylsiloxane, with its excellent low surface energy and impermeability, can be used to modify polyacrylate emulsions and then added to interface treatment agents. It reacts with the cementitious matrix to form a dense silica layer, thereby improving the coating's waterproofness and durability, and enhancing the corrosion resistance of the steel structural components. The modified polyacrylate emulsion can also improve the adhesion between the interface treatment agent and the steel structure surface, increasing the bonding strength and interfacial adhesion between the cementitious matrix and the steel structure. Detailed Implementation

[0020] The present invention is further illustrated below with reference to embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0021] Example 1

[0022] (1) Add 1g of graphene powder and 1g of boron nitride powder to a mixture of 50ml of ethanol and 50ml of water, sonicate at 500W for 30min, centrifuge the mixture at 4000rpm for 30min after treatment, collect the supernatant, and dry the supernatant directly to obtain graphene nanosheet / boron nitride nanosheet composite material.

[0023] (2) 6g of polydimethylsiloxane, 0.01g of dibutyltin dilaurate and 2g of the graphene nanosheet / boron nitride nanosheet composite material prepared above were mixed and stirred at 3000r / min for 30min. Then 100g of polyacrylate emulsion with a solid content of 35% was added and stirred at 10000r / min for 10min to obtain modified polyacrylate emulsion.

[0024] (3) By weight, 100 parts of 42.5 ordinary silicate cement, 80 parts of redispersible latex powder, 300 parts of river sand, 0.5 parts of organosilicon defoamer, 0.2 parts of triethanolamine, and 1 part of hydroxyethyl methyl cellulose with a viscosity of 7000 mPa·s are mixed evenly as the dry component; the modified polyacrylate emulsion prepared above is used as the liquid component; wherein, the dry component and the liquid component are mixed in a mass ratio of 3:1 to obtain the interface treatment agent.

[0025] Example 2

[0026] (1) Add 1g of graphene powder and 1g of boron nitride powder to a mixture of 50ml of ethanol and 50ml of water, sonicate at 500W for 60min, centrifuge the mixture at 5000rpm for 30min after treatment, collect the supernatant, and dry the supernatant directly to obtain graphene nanosheet / boron nitride nanosheet composite material.

[0027] (2) 6g of polydimethylsiloxane, 0.01g of dibutyltin dilaurate and 3g of the graphene nanosheet / boron nitride nanosheet composite material prepared above were mixed and stirred at 5000r / min for 30min. Then 100g of polyacrylate emulsion with a solid content of 35% was added and stirred at 10000r / min for 10min to obtain modified polyacrylate emulsion.

[0028] (3) By weight, 300 parts of 42.5 ordinary silicate cement, 100 parts of redispersible latex powder, 400 parts of river sand, 1 part of organosilicon defoamer, 0.5 parts of triethanolamine, and 2 parts of hydroxyethyl methyl cellulose with a viscosity of 40000 mPa·s are mixed evenly as the dry component; the modified polyacrylate emulsion prepared above is used as the liquid component; wherein, the dry component and the liquid component are mixed in a mass ratio of 3:1 to obtain the interface treatment agent.

[0029] Example 3

[0030] (1) Add 1g of graphene powder and 1g of boron nitride powder to a mixture of 50ml of ethanol and 50ml of water, sonicate at 500W for 40min, centrifuge the mixture at 4500rpm for 30min after treatment, collect the supernatant, and dry the supernatant directly to obtain graphene nanosheet / boron nitride nanosheet composite material.

[0031] (2) 6g of polydimethylsiloxane, 0.01g of dibutyltin dilaurate and 3g of the graphene nanosheet / boron nitride nanosheet composite material prepared above were mixed and stirred at 3500r / min for 30min. Then 100g of polyacrylate emulsion with a solid content of 35% was added and stirred at 10000r / min for 10min to obtain modified polyacrylate emulsion.

[0032] (3) By weight, 150 parts of 42.5 ordinary silicate cement, 85 parts of redispersible latex powder, 350 parts of river sand, 1 part of organosilicon defoamer, 0.3 parts of triethanolamine, and 1 part of hydroxyethyl methyl cellulose with a viscosity of 10000 mPa·s are mixed evenly as the dry component; the modified polyacrylate emulsion prepared above is used as the liquid component; wherein, the dry component and the liquid component are mixed in a mass ratio of 2:1 to obtain the interface treatment agent.

[0033] Example 4

[0034] (1) Add 1g of graphene powder and 1g of boron nitride powder to a mixture of 50ml of ethanol and 50ml of water, sonicate at 500W for 50min, centrifuge the mixture at 5000rpm for 30min after treatment, collect the supernatant, and dry the supernatant directly to obtain graphene nanosheet / boron nitride nanosheet composite material.

[0035] (2) 6g of polydimethylsiloxane, 0.01g of dibutyltin dilaurate and 2.5g of the graphene nanosheet / boron nitride nanosheet composite material prepared above were mixed and stirred at 4000r / min for 30min. Then 100g of polyacrylate emulsion with a solid content of 35% was added and stirred at 10000r / min for 10min to obtain modified polyacrylate emulsion.

[0036] (3) By weight, 200 parts of 42.5 ordinary silicate cement, 90 parts of redispersible latex powder, 350 parts of river sand, 0.8 parts of organosilicon defoamer, 0.4 parts of triethanolamine, and 2 parts of hydroxyethyl methyl cellulose with a viscosity of 7500 mPa·s are mixed evenly as the dry component; the modified polyacrylate emulsion prepared above is used as the liquid component; wherein, the dry component and the liquid component are mixed in a mass ratio of 2:1 to obtain the interface treatment agent.

[0037] Example 5

[0038] (1) Add 1g of graphene powder and 1g of boron nitride powder to a mixture of 50ml of ethanol and 50ml of water, sonicate at 500W for 50min, centrifuge the mixture at 4000rpm for 30min after treatment, collect the supernatant, and dry the supernatant directly to obtain graphene nanosheet / boron nitride nanosheet composite material.

[0039] (2) 6g of polydimethylsiloxane, 0.01g of dibutyltin dilaurate and 2g of the graphene nanosheet / boron nitride nanosheet composite material prepared above were mixed and stirred at 5000r / min for 30min. Then 100g of polyacrylate emulsion with a solid content of 35% was added and stirred at 10000r / min for 10min to obtain modified polyacrylate emulsion.

[0040] (3) By weight, 260 parts of 42.5 ordinary silicate cement, 100 parts of redispersible latex powder, 380 parts of river sand, 1 part of organosilicon defoamer, 0.4 parts of triethanolamine, and 2 parts of hydroxyethyl methyl cellulose with a viscosity of 7500 mPa·s are mixed evenly as the dry component; the modified polyacrylate emulsion prepared above is used as the liquid component; wherein, the dry component and the liquid component are mixed in a mass ratio of 3:1 to obtain the interface treatment agent.

[0041] The interface treatment agents prepared in the above embodiments were coated on the surface of bare steel plate specimens with a coating thickness of 1-2 mm. After curing under natural conditions for 14 days, the performance of the coating was tested, and the test results are shown in Table 1.

[0042] Table 1

[0043]

[0044]

[0045] The test results above show that the interface treatment agent provided by the present invention has excellent adhesion to the steel structure surface, good bonding performance, and can effectively improve the water resistance, high temperature resistance, and corrosion resistance of the steel structure surface.

[0046] Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to this invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A method for preparing an interface treatment agent for steel structures, characterized in that, Includes the following steps: (1) Add graphene powder and boron nitride powder to a mixture of ethanol and water, sonicate, centrifuge the mixture after treatment, collect the supernatant, and dry the supernatant directly to obtain graphene nanosheet / boron nitride nanosheet composite material. (2) Polydimethylsiloxane, dibutyltin dilaurate, and the graphene nanosheet / boron nitride nanosheet composite material prepared above are mixed and stirred, and then polyacrylate emulsion is added and stirred again to obtain modified polyacrylate emulsion; the solid content of the polyacrylate emulsion is 35-40%, the mass ratio of polydimethylsiloxane, dibutyltin dilaurate, graphene nanosheet / boron nitride nanosheet, and polyacrylate emulsion is 6:0.01:(2-3):100; the mass ratio of graphene powder to boron nitride powder is 1:1, the volume ratio of ethanol to water is 1:1, and the solid content in the mixture is 2%; (3) By weight, 100-300 parts of cement, 80-100 parts of redispersible latex powder, 300-400 parts of river sand, 0.5-1 parts of defoamer, 0.2-0.5 parts of triethanolamine, and 1-2 parts of hydroxyethyl methyl cellulose are mixed evenly as the dry component; the modified polyacrylate emulsion prepared above is used as the liquid component; the mass ratio of the dry component to the liquid component is (2-3):

1.

2. The method for preparing an interface treatment agent for steel structures according to claim 1, characterized in that, In step (1), the ultrasonic treatment power is 500W and the time is 30-60min; the centrifugation speed is 4000-5000rpm and the time is 30min.

3. The method for preparing an interface treatment agent for steel structures according to claim 1, characterized in that, In step (2), the mixing speed is 3000-5000 r / min and the time is 30 min. The mixing speed is then increased to 10000 r / min and the time is 5-10 min.

4. The method for preparing an interface treatment agent for steel structures according to claim 1, characterized in that, In step (3), the cement is 42.5 ordinary silicate cement, the particle size of the river sand is 80-100 mesh, the defoamer is an organosilicon defoamer, and the viscosity of the hydroxyethyl methyl cellulose is 7000-40000 mPa·s.

5. An interface treatment agent for steel structures, characterized in that, Prepared by the method described in any one of claims 1 to 4.

Images