Corrosion-inhibiting material, and preparation method therefor and use thereof

Abstract

A corrosion-inhibiting material, and a preparation method therefor the use thereof. The corrosion-inhibiting material comprises a core material and a wall material arranged on at least part of the surface of the core material, wherein the core material comprises a corrosion-inhibiting agent and expanded perlite; and the wall material is a polymer material. The core material of the corrosion-inhibiting material comprises expanded perlite; and the expanded perlite is a porous material and thus can adsorb a powdered corrosion-inhibiting agent in pore channels thereof, which is beneficial for improving the coating effect of a polymer material on the core material, such that the corrosion-inhibiting agent is slowly released under the control of the wall material, and the problem of long-term corrosion inhibition of reinforced concrete can thus be solved.

Description

A rust-resistant material and a preparation method and application thereof

[0001] The present application claims priority to the Chinese patent application No. 202411118015.8, filed on August 14, 2024, and entitled "A rust-resistant material and a preparation method and application thereof", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application belongs to the technical field of materials, and particularly relates to a rust-resistant material and a preparation method and application thereof. BACKGROUND

[0003] Coastal ports, salt fields and saline soil areas usually contain a large amount of sulfate and chloride salts. Under the long-term erosion of chloride ions and sulfate ions, the concrete structure often does not reach the expected service life, and the economic loss caused by the durability problem of reinforced concrete structures is immeasurable. Using rust inhibitors is a conventional method for preventing and rusting reinforced concrete. After inorganic and organic rust inhibitors are mixed into concrete, the concentration of the rust inhibitor in the concrete gradually decreases over time until the rust inhibitor loses its rust inhibition function, and even worse, it can accelerate the corrosion of steel bars in concrete.

[0004] The application CN108129057A discloses a reinforced concrete rust inhibitor and a preparation method thereof. The rust inhibitor comprises the following components in parts by weight: sodium carbonate 35-40 parts; peroxycarboxylic acid disinfectant 40-45 parts, isobutylene alcohol polyoxyethylene ether 3-5 parts, ammonium persulfate 3-5 parts, angelica root 30-35 parts, fatty acid ester 20-25 parts, triethylene tetramine 10-15 parts, and water 10-20 parts. This product does not contain nitrite, is green and environmentally friendly, and has good rust inhibition effect. However, the stability of ether and ester raw materials is reduced in the high alkaline environment of concrete, and they are quickly aged, decomposed and dissolved and lost, losing the rust inhibition function.

[0005] The application CN108439852A discloses a concrete steel bar rust inhibitor. The rust inhibitor adopts a microcapsule structure, and the capsule wall is composed of polyurea and urea-formaldehyde mixture. The polyurea has good film-forming property, acid and alkali resistance, chemical stability, and high mechanical property. The mixture is not easy to break in the concrete during mixing and pouring, and the urea-formaldehyde is a water-soluble resin that is easy to solidify. The mixture of the two is beneficial to improve the physical, mechanical and chemical properties of the capsule wall. However, the rust inhibitor has poor effect in long-term rust inhibition application.

[0006] The application CN106431069A discloses a slow-release type rust inhibitor microcapsule applied to reinforced concrete and a preparation method thereof. The rust inhibitor microcapsule is prepared by centrifugal granulation and fluidized bed coating, has a small size, good slow-release effect, and controllable release rate of core material. However, the wall material is ruptured to different degrees after 60 days, and thus the problem of long-term rust inhibition cannot be solved.

[0007] In summary, the existing rust inhibitor cannot solve the problem of long-term rust inhibition. Therefore, in order to ensure the quality of reinforced concrete structures, it is urgent to develop a rust inhibitor material with long-term rust inhibition function. SUMMARY

[0008] The main purpose of the present application is to provide a rust inhibitor material, which has good long-term rust inhibition effect and can solve the problem of long-term rust inhibition of concrete when added to concrete.

[0009] The present application also provides a preparation method of a rust inhibitor material, which can prepare the above-mentioned rust inhibitor material and has simple process and low cost.

[0010] The present application also provides a concrete comprising the above-mentioned rust inhibitor material, and thus the concrete has good long-term rust inhibition effect.

[0011] In the first aspect, the present application provides a rust inhibitor material comprising a core material and a wall material arranged on at least part of the surface of the core material.

[0012] The core material comprises a rust inhibitor and expanded perlite, and the wall material is a high molecular material.

[0013] The rust inhibitor material described above has a mass ratio of the core material to the wall material of 0.2-0.7:1.

[0014] The rust inhibitor material described above has a thickness of the wall material of 50-300μm.

[0015] The rust inhibitor material described above has a bulk density of the expanded perlite of 200-300kg / m 3 , and an average particle size of 0.5-3.0mm.

[0016] The rust inhibitor material described above has a rust inhibitor comprising at least one of monoethanolamine benzoate, monoethanolamine, triethanolamine, sodium benzoate, sodium monofluorophosphate, benzotriazole, imidazole compounds, pyridone ethanolamine salt, isopropanolamine, and trisodium phosphate.

[0017] The rust inhibitor material described above has a mass ratio of the rust inhibitor to the expanded perlite of 2-5:1.

[0018] The rust inhibitor material described above has a number average molecular weight of the high molecular material of 60000-100000.

[0019] The rust-preventing material as described above, wherein the high molecular material comprises an aqueous acrylic resin and an epoxy-modified acrylic resin.

[0020] The mass ratio of the aqueous acrylic resin and the epoxy-modified acrylic resin is 0.5-2:1.

[0021] The rust-preventing material as described above, wherein the rust-preventing material is spherical or ellipsoidal, and the average particle size is 0.6-3.6 mm.

[0022] In a second aspect, the present application provides a preparation method of the rust-preventing material as described above, comprising the following steps:

[0023] 1) placing the expanded perlite into a solution comprising the rust-preventing agent, and performing first stirring to obtain saturated expanded perlite, and performing drying treatment on the saturated expanded perlite to obtain the core material;

[0024] 2) performing second stirring on a mixed system comprising the high molecular material and water to obtain a coating liquid;

[0025] 3) performing coating treatment on the core material by using the coating liquid, and drying to obtain the rust-preventing material.

[0026] The preparation method as described above, wherein the mass ratio of the high molecular material and water in the mixed system is 3-10:1; and / or,

[0027] The mass ratio of the coating liquid and the core material is 1.4-5:1.

[0028] In a third aspect, the present application provides a concrete comprising the rust-preventing material as described above or the rust-preventing material prepared by the preparation method as described above.

[0029] In the rust-preventing material provided by the present application, the core material comprises expanded perlite, and the expanded perlite is a porous material, which can adsorb the powder rust-preventing agent in the pores, and is beneficial to improve the coating effect of the high molecular material on the core material, so that the rust-preventing agent is slowly released under the control of the wall material, and the long-term rust-prevention problem of reinforced concrete can be solved. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] In a first aspect, the present application provides a rust-preventing material, comprising a core material and a wall material arranged on at least part of the surface of the core material.

[0032] The core material comprises a rust-preventing agent and expanded perlite, and the wall material is a polymer material.

[0033] The rust-preventing material of the present application has the core material comprising a rust-preventing agent and expanded perlite. The expanded perlite has a porous structure, and can adsorb the powder rust-preventing agent in the pore structure, thereby providing a good storage and release environment for the rust-preventing agent, and can control the slow release of the rust-preventing agent to a certain extent, and is also conducive to the complete coating of the wall material on the core material, thereby prolonging the duration of the rust-preventing effect.

[0034] The rust-preventing material of the present application has a microcapsule structure, and the core material, i.e. the rust-preventing agent and the expanded perlite, to be protected is coated inside the wall material, and the wall material does not react with the core material, and plays a decisive role in the slow release of the core material. In addition, the microcapsule has a special core-shell structure, and has some unique functions, for example, the wall material can effectively isolate the influence of the external environment such as temperature, humidity, ultraviolet light, etc., thereby improving the stability of the core material; and through the rupture or decomposition of the wall material, the core material inside is slowly released, thereby prolonging the service life and storage time.

[0035] The rust-preventing material provided by the present application has the core material comprising expanded perlite. The expanded perlite is a porous material, and can adsorb the powder rust-preventing agent in the pores, thereby being conducive to improving the coating effect of the polymer material on the core material, and under the control of the wall material, the rust-preventing agent is slowly released, thereby solving the problem of long-term rust prevention of concrete. The rust-preventing material is suitable for reinforced concrete engineering in coastal ports, salt fields and saline soil areas.

[0036] In some embodiments of the present application, the mass ratio of the core material to the wall material is 0.2-0.7:1.

[0037] In the present application, the mass ratio of the core material to the wall material is controlled to be 0.2-0.7:1, so as to control the thickness of the wall material in an appropriate range, thereby making the rust-preventing agent have a suitable slow release speed, and achieving a better rust-preventing effect.

[0038] Further, the thickness of the wall material is 50-300 μm.

[0039] It should be noted that the rust-preventing material provided by the present application has a thicker wall material, and the rust-preventing agent can be slowly released through the control of the wall material for a longer period of time, thereby further solving the problem of long-term rust prevention of concrete.

[0040] In some embodiments of the present application, the bulk density of the expanded perlite is 200-300 kg / m 3 , and the average particle size is 0.5-3.0 mm.

[0041] The bulk density of the expanded perlite in the present application is suitable, so that the gap between the particles thereof is suitable, which is beneficial to the flow and penetration of the rust inhibitor therein. The average particle size is in a suitable range, and the pore size inside is relatively moderate, which will not cause the rust inhibitor to be difficult to enter the pore due to being too small, nor will it cause the rust inhibitor to be unable to effectively adhere due to being too large, which is beneficial to the rust inhibitor to be fully filled in the pores thereof. Furthermore, it is beneficial to improve the coating effect of the high polymer material on the core material and to control the slow release of the rust inhibitor.

[0042] Further, the rust inhibitor comprises at least one of monoethanolamine benzoate, monoethanolamine, triethanolamine, sodium benzoate, sodium monofluorophosphate, benzotriazole, imidazole compounds, pyridone ethanolamine salt, isopropanolamine, and trisodium phosphate.

[0043] In some embodiments of the present application, the mass ratio of the rust inhibitor to the expanded perlite is 2-5:1.

[0044] The mass ratio of the rust inhibitor to the expanded perlite in the present application is in a suitable range, which can make the rust inhibitor fully enter the pores of the expanded perlite for adhesion, which is beneficial to the full coating of the high polymer material on the core material; and a reasonable ratio is helpful to reduce the waste of the rust inhibitor and the expanded perlite, reduce the cost, and is beneficial to the maximization of the use of materials and environmental protection benefits.

[0045] In some embodiments of the present application, the number average molecular weight of the high polymer material is 60000-100000.

[0046] The number average molecular weight of the high polymer material as the microcapsule wall material in the present application is in a suitable range, on the one hand, which can adjust the permeability of the microcapsule wall material, so as to control the release rate and release mode of the rust inhibitor in the core material, and can achieve the effect of long-term rust prevention; on the other hand, which can make the wall material have high chemical stability and thermal stability, so as to protect the core material from damage by external factors such as light, heat, and oxygen, and improve the storage stability and service life of the rust prevention material.

[0047] Further, the high polymer material comprises water-based acrylic resin and epoxy modified acrylic resin.

[0048] The mass ratio of the water-based acrylic resin to the epoxy modified acrylic resin is 0.5-2:1.

[0049] The high polymer material as the wall material in the application includes water-based acrylic resin and epoxy-modified acrylic resin. The acrylic resin will gradually decompose in the high alkaline environment of concrete, and the rust inhibitor in the rust-resistant material is released. The rust inhibitor is transported to the surface of the steel bar by using the migration of the rust inhibitor in the concrete to protect the steel bar. The alkali resistance of the epoxy-modified acrylic resin is better than that of the water-based acrylic resin, and the decomposition time in the concrete is longer, so that the release speed of the rust inhibitor in the core material can be controlled, and the long-acting rust prevention effect is achieved. In addition, the wall material used in the application is a water-based resin, which does not contain organic solvents, is environmentally friendly and safe, and has low storage and use risks.

[0050] In the application, the mass ratio of the water-based acrylic resin and the epoxy-modified acrylic resin is controlled in a suitable range, so that the wall material with high mechanical strength is formed, which is not easy to break during construction, can further protect the core material from damage, and can control the release speed of the rust inhibitor in the core material, thereby achieving the long-acting rust prevention effect.

[0051] In some embodiments of the application, the rust-resistant material is spherical or ellipsoidal, and the average particle size is 0.6-3.6mm.

[0052] In the application, the rust-resistant material is spherical or ellipsoidal with a suitable average particle size, which can include a relatively high content of rust inhibitor. In addition, the rust-resistant material can replace part of the sand and be used in concrete, thereby improving the mechanical strength and long-acting rust prevention effect of the concrete.

[0053] In a second aspect, the application provides a preparation method of the rust-resistant material as described above, which comprises the following steps:

[0054] 1) Put the expanded perlite into a solution containing the rust inhibitor, and perform first stirring to obtain saturated expanded perlite. Dry the saturated expanded perlite to obtain the core material;

[0055] 2) Perform second stirring on the mixed system containing the high polymer material and water to obtain a coating liquid;

[0056] 3) Use the coating liquid to coat the core material, and dry to obtain the rust-resistant material.

[0057] The preparation method of the rust-resistant material in the application first prepares the core material and the coating liquid, and then coats the core material with the coating liquid to obtain the rust-resistant material.

[0058] Specifically, in step 1), the rust inhibitor is prepared into a rust inhibitor aqueous solution with a mass fraction of 40%, and then the expanded perlite is put into the rust inhibitor aqueous solution for first stirring. The first stirring time can be 10-30 min, so that the expanded perlite fully absorbs the rust inhibitor aqueous solution to obtain saturated expanded perlite. Then, the saturated expanded perlite is put into an oven at 50-70°C for drying for 60-120 min, so that the water in the rust inhibitor aqueous solution is completely volatilized to obtain the core material.

[0059] In step 2), the high molecular material for controlling the release of the rust inhibitor is added into water, and second stirring is performed using a magnetic stirrer to uniformly prepare a coating liquid.

[0060] In step 3), the core material is placed in a fluidized bed, and in the coating mode, the fan speed is adjusted to 600-900 rpm, the air inlet pressure is adjusted to 0.7-0.9 MPa, and the air inlet temperature is adjusted to 35-45°C. The coating liquid is loaded into a spray gun, the spray gun atomization pressure is controlled to be 0.25-0.4 MPa, and the automatic program is started for coating treatment. After the coating is completed, drying treatment is performed to obtain the rust-resistant material. After the wall material is dried and solidified, the strength is high, and the adhesion to cement is higher than that of conventional sand, which can improve the strength of the concrete.

[0061] The preparation method of the present application can prepare the rust-resistant material of the first aspect of the present application. The rust inhibitor is adsorbed in the pore channel of the expanded perlite, and under the control of the wall material, the rust inhibitor is slowly released, thereby solving the problem of long-term rust prevention of the concrete.

[0062] In some embodiments of the present application, the mass ratio of the high molecular material to water in the mixed system is 3-10:1; and / or,

[0063] The mass ratio of the coating liquid to the core material is 1.4-5:1.

[0064] In the present application, the mass ratio of the high molecular material to water and the mass ratio of the coating liquid to the core material are controlled in a suitable range, which is beneficial to forming a rust-resistant material with a microcapsule structure of a suitable wall material thickness, so that the rust inhibitor has a suitable slow release speed and achieves a long-term rust prevention effect.

[0065] In a third aspect, the present application provides a concrete comprising the rust-resistant material as described above or prepared by the preparation method as described above.

[0066] The concrete of the present application comprises the rust-resistant material as described above or prepared by the preparation method as described above, and therefore, the long-term rust prevention effect of the concrete is good. Alternatively, the rust-resistant material can be mixed into the concrete to replace part of the conventional sand, and the mixing amount can be 15-35 kg / m 3 , which can effectively prevent the dissolution and loss of the rust inhibitor during the concrete slurry preparation stage.

[0067] The technical solutions of the present application are further illustrated below in combination with specific examples.

[0068] Example 1

[0069] The preparation method of the rust-preventing material of the present example comprises the following steps:

[0070] 1) Dissolve 400 g of monoethanolamine benzoate, 300 g of sodium benzoate, 100 g of benzotriazole and 200 g of trisodium phosphate in water to prepare a rust-preventing agent aqueous solution with a mass concentration of 40%; take 200 g of expanded perlite and place it in the above rust-preventing agent aqueous solution, wherein the bulk density of the expanded perlite is 200 kg / m 3 , the average particle size is 3.0 mm, and the first stirring is performed for 15 min; take out the saturated expanded perlite and place it in a 65℃ oven for drying for 70 min to obtain the core material; wherein the mass ratio of the rust-preventing agent to the expanded perlite is 5:1.

[0071] 2) Take 600 g of water-based acrylic resin (with a number average molecular weight of 60000) and 1200 g of epoxy-modified acrylic resin (with a number average molecular weight of 90000), add 180 g of water, and perform the second stirring to obtain a coating liquid; wherein the mass ratio of the water-based acrylic resin to the epoxy-modified acrylic resin is 0.5:1, and the mass ratio of the high molecular material to water is 10:1.

[0072] 3) Place 300 g of the core material in a fluidized bed, adjust the fan speed to 700 rpm, the inlet air pressure to 0.8 MPa, the inlet air temperature to 35℃, and the spray gun atomization pressure to 0.30 MPa in the coating mode, use 1500 g of the coating liquid to coat the core material, and the mass ratio of the coating liquid to the core material is 5:1; after drying, spherical rust-preventing material is obtained. Wherein the mass ratio of the core material to the wall material is 0.22:1; the thickness of the wall material is 300 μm, and the average particle size of the rust-preventing material is 3.6 mm.

[0073] Example 2

[0074] The preparation method of the rust-preventing material of the present example comprises the following steps:

[0075] 1) Dissolve 400 g of monoethanolamine benzoate, 300 g of sodium benzoate, 100 g of benzotriazole and 200 g of trisodium phosphate in water to prepare a rust-preventing agent aqueous solution with a mass concentration of 40%; take 200 g of expanded perlite and place it in the above rust-preventing agent aqueous solution, wherein the bulk density of the expanded perlite is 200 kg / m 3 , the average particle size is 3.0 mm, and the first stirring is performed for 15 min; take out the saturated expanded perlite and place it in a 65℃ oven for drying for 70 min to obtain the core material; wherein the mass ratio of the rust-preventing agent to the expanded perlite is 5:1.

[0076] 2) Take 900 g of water-based acrylic resin (number average molecular weight of 60000) and 900 g of epoxy modified acrylic resin (number average molecular weight of 90000), add 300 g of water, and perform second stirring to obtain a coating liquid; wherein the mass ratio of the water-based acrylic resin and the epoxy modified acrylic resin is 1:1, and the mass ratio of the high molecular material and water is 6:1.

[0077] 3) Place 300 g of the core material in the fluidized bed, adjust the fan speed to 800 rpm in the coating mode, the inlet air pressure to 0.7 MPa, the inlet air temperature to 45℃, and the spray gun atomization pressure to 0.35 MPa, use 1200 g of the coating liquid to coat the core material, the mass ratio of the coating liquid and the core material is 4:1, and after drying, spherical rust-resistant materials are obtained. The mass ratio of the core material and the wall material is 0.29:1; the thickness of the wall material is 230 μm, and the average particle size of the rust-resistant material is 2.7 mm.

[0078] Example 3

[0079] The preparation method of the rust-resistant material of the present embodiment comprises the following steps:

[0080] 1) Dissolve 300 g of monoethanolamine, 300 g of sodium monofluorophosphate, 200 g of isopropanolamine, and 200 g of pyridinone ethanolamine salt in water to prepare a rust inhibitor aqueous solution with a mass concentration of 40%; take 330 g of expanded perlite and place it in the above-mentioned rust inhibitor aqueous solution, wherein the bulk density of the expanded perlite is 240 kg / m 3 , the average particle size is 1.3 mm, and the first stirring is performed for 15 min; take out the saturated expanded perlite and place it in a 60℃ oven for drying for 90 min to obtain the core material; wherein the mass ratio of the rust inhibitor and the expanded perlite is 3:1.

[0081] 2) Take 1200 g of water-based acrylic resin (number average molecular weight of 60000) and 600 g of epoxy modified acrylic resin (number average molecular weight of 90000), add 400 g of water, and perform second stirring to obtain a coating liquid; wherein the mass ratio of the water-based acrylic resin and the epoxy modified acrylic resin is 2:1, and the mass ratio of the high molecular material and water is 4.5:1.

[0082] 3) Place 300 g of the core material in the fluidized bed, adjust the fan speed to 900 rpm in the coating mode, the inlet air pressure to 0.9 MPa, the inlet air temperature to 40℃, and the spray gun atomization pressure to 0.40 MPa, use 900 g of the coating liquid to coat the core material, the mass ratio of the coating liquid and the core material is 3:1, and after drying, spherical rust-resistant materials are obtained. The mass ratio of the core material and the wall material is 0.4:1; the thickness of the wall material is 150 μm, and the average particle size of the rust-resistant material is 1.6 mm.

[0083] Example 4

[0084] The preparation method of the rust-preventing material of the present embodiment comprises the following steps:

[0085] 1) 250 g of monoethanolamine, 250 g of sodium monofluorophosphate, 250 g of isopropanolamine, and 250 g of pyridone ethanolamine salt are dissolved in water to prepare a rust-preventing agent aqueous solution with a mass concentration of 40%; 500 g of expanded perlite is placed in the rust-preventing agent aqueous solution, wherein the bulk density of the expanded perlite is 200 kg / m 3 , and the average particle size is 0.5 mm, and the first stirring is performed for 15 min; the saturated expanded perlite is taken out and dried in a 60℃ oven for 80 min to obtain the core material; wherein the mass ratio of the rust-preventing agent to the expanded perlite is 2:1.

[0086] 2) 750 g of water-based acrylic resin (with a number average molecular weight of 60000) and 1050 g of epoxy-modified acrylic resin (with a number average molecular weight of 100000) are added to 480 g of water, and the second stirring is performed to obtain a coating liquid; wherein the mass ratio of the water-based acrylic resin to the epoxy-modified acrylic resin is 0.7:1, and the mass ratio of the high molecular material to water is 3.75:1.

[0087] 3) 300 g of the core material is placed in a fluidized bed, and in the coating mode, the fan speed is adjusted to 750 rpm, the inlet air pressure is 0.75 MPa, the inlet air temperature is 35℃, the spray gun atomization pressure is 0.35 MPa, 600 g of the coating liquid is used for coating treatment of the core material, and the mass ratio of the coating liquid to the core material is 2:1; after drying, the spherical rust-preventing material is obtained. The mass ratio of the core material to the wall material is 0.63:1; the thickness of the wall material is 50 μm, and the average particle size of the rust-preventing material is 0.6 mm.

[0088] Example 5

[0089] The preparation method of the rust-preventing material of Example 5 is basically the same as that of Example 1, except that the mass ratio of the high molecular material to water is changed to 7:1, and the mass ratio of the coating liquid to the core material is changed to 3.5:1.

[0090] Example 6

[0091] The preparation method of the rust-preventing material of Example 6 is basically the same as that of Example 1, except that the mass ratio of the high molecular material to water is changed to 4:1, and the mass ratio of the coating liquid to the core material is changed to 2:1.

[0092] Example 7

[0093] The preparation method of the rust-preventing material of Example 7 is basically the same as that of Example 1, except that the bulk density of the expanded perlite is changed to 200 kg / m 3 , and the average particle size is changed to 2.0 mm.

[0094] Example 8

[0095] The preparation method of the rust-preventing material of Example 8 is basically the same as that of Example 1, except that the mass ratio of the rust-preventing agent and the expanded perlite is changed to 3.5:1.

[0096] Example 9

[0097] The preparation method of the rust-preventing material of Example 9 is basically the same as that of Example 1, except that the mass ratio of the rust-preventing agent and the expanded perlite is changed to 2:1.

[0098] Example 10

[0099] The preparation method of the rust-preventing material of Example 10 is basically the same as that of Example 1, except that the number average molecular weight of the water-based acrylic resin is changed to 75,000 and the number average molecular weight of the epoxy-modified acrylic resin is changed to 100,000.

[0100] Example 11

[0101] The preparation method of the rust-preventing material of Example 11 is basically the same as that of Example 1, except that the mass ratio of the water-based acrylic resin and the epoxy-modified acrylic resin is changed to 2:1.

[0102] Comparative Example 1

[0103] The preparation method of the rust-preventing material of Comparative Example 1 is basically the same as that of Example 1, except that the expanded perlite is not added to the core material.

[0104] Comparative Example 2

[0105] The preparation method of the rust-preventing material of Comparative Example 2 includes the following steps:

[0106] 1) A first mixture with good dispersing performance is prepared by using isobutylene alcohol polyoxyethylene ether as a macromonomer, peroxycarboxylic acid disinfectant as a polymerization monomer, and adding an initiator ammonium persulfate, with a reaction temperature of 80°C and a reaction time of 4-5h;

[0107] 2) A second mixture is obtained by mixing sodium carbonate, the first mixture, and angelica essence;

[0108] 3) A third mixture is prepared by mixing fatty acid methyl ester and triethylenetetramine;

[0109] 4) A fourth mixture is prepared by mixing the second mixture and the third mixture;

[0110] 5) add water to the fourth mixture and stir until uniform to obtain the rust- resistant material, finally, the rust-resistant material includes 36 parts of sodium carbonate; 43 parts of peroxycarboxylic acid disinfectant, 4 parts of isobutenol polyoxyethylene ether, 4 parts of ammonium persulfate, 32 parts of angelica essence, 24 parts of fatty acid methyl ester, 11 parts of triethylene tetramine, and 16 parts of water.

[0111] Comparative Example 3

[0112] The rust-resistant material in the present comparative example includes a wall material and a core material, and is composed of a wall material with a thickness of 34-40 μm and a mass ratio of polyurea and urea-formaldehyde mixture of 2:1, 27 parts, and a core material, 65 parts, which is composed of 5.5 parts of triethanolamine, 6 parts of 1-butyl-3-methyl imidazole sodium tetrafluoroborate, 7.5 parts of sodium molybdate, and 1.25 parts of polycarboxylic acid water reducer, wherein the polycarboxylic acid water reducer is a strong polycarboxylic acid water reducer produced by BASF Company, and the solid content is 40%. The rust-resistant material in the present example also includes 1.3 parts of surfactant, which is composed of polyoxyethylene ether and glucose ester with a mass ratio of 0.5:1.

[0113] The specific preparation method of the rust-resistant material in the present comparative example is as follows: 6 parts of 1-butyl-3-methyl imidazole sodium tetrafluoroborate, 7.5 parts of sodium molybdate, and 1.25 parts of polycarboxylic acid water reducer in the core material are respectively put into a ball mill, and mixed at a rotation speed of 1800 rpm for 20 min. Then, 5.5 parts of triethanolamine is dissolved in 1 part of distilled water, and stirred until completely dissolved, and then added into the ball mill, and mixed at a rotation speed of 1200 rpm for 10 min to obtain a core material mixture. Then, 65 parts of the core material mixture is added into a solution containing 1.3 parts of surfactant which is mixed by polyoxyethylene ether and glucose ester with a mass ratio of 0.5:1, and stirred at a high speed to prepare a master batch, wherein the volume ratio of surfactant to water in the surfactant solution is 1:15-25.

[0114] 3) add the granulation master batch into a centrifugal granulator, open the air blower, adjust the rotation speed of the rotating disc to 1200 rpm, open the peristaltic pump to supply liquid, close the peristaltic pump when the material flows in the pot in a flocculent state, continue to rotate, polish, and take out when the size and hardness of the granules meet the requirements, dry, and prepare the core material pellets. Then, 27 parts of polyurea and urea-formaldehyde mixture with a mass ratio of 2:1 is sprayed on the surface of the core material pellets by hot spray, and the core material pellets are in a vacuum suspended state during the spraying process. The feeding temperature is 300℃, the pressure of the liquid pump is 2-3 MPa, and the outlet temperature is 100℃. Vacuum drying is performed to obtain the rust-resistant material.

[0115] Comparative Example 4

[0116] The preparation method of the rust-resistant material in Comparative Example 4 includes the following steps:

[0117] 1) 1000g sodium monofluorophosphate, 900g microcrystalline cellulose, 1100g deionized water, 20g hydroxypropyl methyl cellulose are mixed and then added to a centrifugal device, the air blower is turned on, the air blower speed is 400 rpm, the turntable speed is 600 rpm, the peristaltic pump is turned on to supply liquid, the peristaltic pump speed is 10 rpm, the liquid supply amount is 300 mL, the peristaltic pump is turned off when the material flows in the pot in a flocculent manner, and the rotation is continued, polishing, and the particles are taken out when the size and hardness of the particles meet the requirements, and dried to obtain the core material;

[0118] 2) ethyl cellulose is added to ethyl acetate, wherein the mass ratio of ethyl cellulose to ethyl acetate is 1:12, and a transparent and uniform coating liquid is prepared under heating and stirring of a magnetic stirrer;

[0119] 3) 200g of the core material is placed in a fluidized bed, in the coating mode, the fan speed is adjusted to 800 rpm, the air inlet pressure is 0.9 MPa, and the preheating is started, the air inlet temperature is adjusted to stabilize the material temperature at 30-40℃, the peristaltic pump is turned on and the peristaltic pump speed is adjusted to 15 rpm, the mass of the wall material ethyl cellulose in the coating liquid is 20g, the coating is stopped after the coating liquid is sprayed, and the rust-resistant material is obtained after drying for 10-20min.

[0120] Test example:

[0121] The rust-resistant materials in the examples and comparative examples are added to the concrete in an amount of 25kg / m 3 , and the corrosion resistance of the concrete is detected.

[0122] 1. Corrosion charge ratio: GB / T 31296-2014 “Concrete Corrosion Resistance Inhibitor” Appendix A.

[0123] 2. Corrosion potential: JGJ / T 152-2019 “Technical Standard for Reinforcing Steel Detection in Concrete” 7.3 half-cell potential method.

[0124] Table 1

[0125] As can be seen from Table 1, compared with the comparative examples, the core material of the rust-resistant material provided by the application comprises expanded perlite, and the expanded perlite is a porous material, which can adsorb the powder-shaped rust inhibitor in its pore channel, which is conducive to improving the coating effect of the high molecular material on the core material, so that the rust inhibitor is slowly released under the control of the wall material, thereby solving the problem of long-term rust resistance of concrete.

[0126] From the comparison of examples 1-11 and comparative examples 1-4, it can be seen that the corrosion electric quantity of the rust-proof materials of examples 1-11 is lower than that of comparative examples 1-4 after 168 days, and the corrosion electric quantity of the rust-proof materials of examples 1-11 has a downward trend compared with the corrosion electric quantity after 56 days, while the corrosion electric quantity of the rust-proof materials of comparative examples 1-4 after 168 days has an increasing trend compared with the corrosion electric quantity after 56 days, which indicates that the rust-proof materials of examples 1-11 can slowly release the rust inhibitor, thereby solving the problem of long-term rust prevention of concrete, while the rust prevention problem of comparative examples cannot be solved after 56 days. The corrosion electric potential of examples 1-11 is higher than that of comparative examples 1-4 after 168 days, which further indicates that the rust-proof materials of examples can solve the problem of long-term rust prevention of concrete.

[0127] The rust-proof materials provided by the present application have thick wall materials, and the rust inhibitor can be slowly released under the control of the wall material after 168 days, thereby further solving the problem of long-term rust prevention of concrete.

[0128] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rust-preventive material, characterized by comprising: The core material and the wall material are mixed to form a rust-proof material. The core material comprises a rust inhibitor and expanded perlite, and the wall material is a polymer material.

2. The rust-preventive material according to claim 1, wherein The mass ratio of the core material to the wall material is 0.2-0.7:

1.

3. The rust-preventive material according to claim 1 or 2, characterized by, The thickness of the wall material is 50-300 μm.

4. The rust-preventive material according to any one of claims 1 to 3, characterized by The bulk density of the expanded perlite is 200-300 kg / m 3 The average particle size is 0.5-3.0 mm.

5. The rust-preventive material according to any one of claims 1 to 4, characterized by The rust inhibitor comprises at least one of monoethanolamine benzoate, monoethanolamine, triethanolamine, sodium benzoate, sodium monofluorophosphate, benzotriazole, imidazole compounds, pyridone ethanolamine salt, isopropanolamine, and trisodium phosphate.

6. The rust-preventive material according to any one of claims 1 to 5, characterized by The mass ratio of the rust inhibitor to the expanded perlite is 2-5:

1.

7. The rust-preventive material according to any one of claims 1 to 6, wherein The number average molecular weight of the polymer material is 60,000-100,000.

8. The rust-preventive material according to any one of claims 1 to 7, characterized by The polymer material comprises an aqueous acrylic resin and an epoxy-modified acrylic resin. The mass ratio of the aqueous acrylic resin to the epoxy-modified acrylic resin is 0.5-2:

1.

9. The rust-preventive material according to any one of claims 1 to 8, wherein The rust-proof material is spherical or ellipsoidal, and the average particle size is 0.6-3.6 mm.

10. A method of producing the rust-preventive material as claimed in any one of claims 1 to 9, characterized by, The method comprises the following steps: 1) placing the expanded perlite into a solution comprising the rust inhibitor, and performing first stirring to obtain saturated expanded perlite, and drying the saturated expanded perlite to obtain the core material; 2) performing second stirring on a mixed system comprising the polymer material and water to obtain a coating liquid; 3) coating the core material with the coating liquid, and drying to obtain the rust-proof material.

11. The method of claim 10, wherein, The mass ratio of the polymer material to water in the mixed system is 3-10:1; and / or, The mass ratio of the coating liquid to the core material is 1.4-5:

1.

12. A concrete, characterized in that, The rust-proof material comprises the core material and the wall material, wherein the core material comprises a rust inhibitor and expanded perlite, and the wall material is a polymer material. The method comprises the following steps: 1) placing the expanded perlite into a solution comprising the rust inhibitor, and performing first stirring to obtain saturated expanded perlite, and drying the saturated expanded perlite to obtain the core material; 2) performing second stirring on a mixed system comprising the polymer material and water to obtain a coating liquid; 3) coating the core material with the coating liquid, and drying to obtain the rust-proof material.

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