Multifunctional surface maintenance material, and preparation method therefor and use thereof

Abstract

The present application provides a multifunctional surface maintenance material, and a preparation method therefor and a use thereof. The multifunctional surface maintenance material comprises: an organic complex layer connected to a metal product, a hydrophilic layer connected to the organic complex layer, and a hydrophobic layer covering a gel structure; the organic complex layer is a complex formed by organic silicon and free iron in the metal product; a water-absorbing layer is of a mesh or gel structure containing a hydrophilic group; and the hydrophobic layer is an aliphatic compound. According to the present application, the organic complex layer, the hydrophilic layer and the hydrophobic layer are provided on the surface of the metal product, and the organic complex layer is complexed with the metal product, so that the organic complex layer can be tightly bonded to the surface of the metal product to repair defects on the metal surface. The hydrophilic layer can store a certain amount of moisture and thus reduces the impact of the moisture on the metal, and the hydrophobic layer can prevent intrusion of the moisture.

Description

A multifunctional surface care material and its preparation method and application Technical Field

[0001] The present application relates to the technical field of composite materials, and in particular to a multifunctional surface care material and a preparation method and application thereof. Background Art

[0002] With the rapid development of polymer materials, composite materials are increasingly used in production and life. Due to their wide range of sources, high strength, light weight, and excellent mechanical, heat and wear resistance, they have penetrated into various fields of national development.

[0003] With the trend toward lightweight weaponry, composite materials have naturally entered the public's radar. This is because military weapons are mostly made of steel, which is prone to rust. Rust can form on the trigger, especially after rain, rendering the weapon completely inoperable. Even with regular use of gun oil, rust is still unavoidable. Furthermore, in low- or even extremely cold regions, gun oil becomes increasingly viscous and can even solidify, rendering a significant portion of weapons useless and severely impacting the development of my country's military capabilities.

[0004] During snowy weather, the rapidly dropping temperatures not only increase the brittleness of steel products and alter the metal's internal crystal structure, making them susceptible to rust, but also when weapons are exposed to humid air, condensation will re-condense inside the weapon during firing, further exacerbating the severity of rust. Furthermore, the corrosive nature of combustion gases can cause component surfaces to become rough, and once ice forms, it adheres strongly and is difficult to break off, easily causing accidents. Currently, composite materials used in weapons are primarily used for handguards, stocks, and magazines, but these issues remain unresolved. Military firearms packaging composite materials have also emerged, but they cannot prevent moisture from corroding the metal during use. Gun barrels produced using a carbon fiber tube-in-tube process, however, have air gaps between the stainless steel and carbon fiber tubes, and the aforementioned issues persist in humid or cold regions. Furthermore, carbon fiber can become brittle and have poor impact resistance in extremely cold weather.

[0005] Summary of the Invention

[0006] In response to the above-mentioned problems, the present application proposes a multifunctional surface maintenance material; it provides an organic complexing layer, a hydrophilic layer and a hydrophobic layer on the surface of the metal product, and through the complexation of the organic complexing layer with the metal product, it can be tightly bonded to the surface of the metal product and repair the defects of the metal surface; the hydrophilic layer can store a certain amount of moisture to reduce the impact of moisture on the metal, and the hydrophobic layer can prevent the intrusion of water vapor; and when the temperature of the metal product is high, the moisture in the hydrophilic layer can absorb heat and evaporate, thereby playing a role in lowering the temperature, overcoming the shortcomings and defects mentioned in the background technology.

[0007] To achieve the above objectives, this application adopts the following technical solutions:

[0008] The invention of this application is to provide a multifunctional surface care material, including: an organic complex layer connected to the metal product, a hydrophilic layer connected to the organic complex layer, and a hydrophobic layer covering the gel structure; the organic complex layer is a complex formed by silicone and free iron in the metal product; the water-absorbing layer is a network or gel structure containing a hydrophilic group; and the hydrophobic layer is an aliphatic compound.

[0009] Optionally, the organosilicon includes polysiloxane substituted with alkyl, alkenyl or alkynyl groups; the network or gel structure containing hydrophilic groups includes polymers of enols, alkenyl acids or alkenyl amides containing or not containing substituents; the aliphatic compound is a polymer formed by alkyl, alkenyl, alkynyl groups and / or alkenyl, alkynyl groups containing substituents.

[0010] Optionally, the organic complexing layer also reacts with the hydrophobic layer in situ to form a cross-linked structure.

[0011] Optionally, the thickness of the organic complex layer is 7 to 15 μm; the hydrophilic layer is 1 to 5 μm; and the hydrophobic layer is 5 to 10 μm. Another invention of the present application is to provide a method for preparing any of the multifunctional surface care materials described above, comprising: (1) adding a precursor monomer of an organosilicon to a solvent I to obtain a solution I; (2) adding a precursor having a network or gel structure containing a hydrophilic group to a solvent II to obtain a solution II; (3) adding a precursor of an aliphatic compound to a solvent III to obtain a solution III; and (4) applying solution I, solution II, and solution III sequentially to the surface of a metal product and curing them to obtain the multifunctional surface care material.

[0012] Optionally, the curing conditions are: temperature of 50 to 80° C. and time of 20 to 60 minutes.

[0013] Optionally, in step (1), the solvent I is water, and the precursor monomer of the organosilicon undergoes a hydrolysis reaction with water.

[0014] Optionally, the precursor monomer of the organosilicon includes chlorosilane.

[0015] Optionally, the molar ratio of solvent I to the precursor monomer of the organosilicon is not less than 3:1.

[0016] Another invention point of the present application is to provide an application of any of the above-mentioned multifunctional surface care materials on the surface of metal products.

[0017] Compared with the prior art, this application has the following beneficial effects:

[0018] (1) The present invention provides an organic complexing layer on the metal surface that can complex with the metal and complex with the free iron in the metal, thereby preventing the free iron from rusting; at the same time, it can also fill in the defects to avoid subsequent problems such as impurity deposition. The hydrophilic layer cross-linked with the organic complexing layer has a hydrophilic network structure or gel structure that can adsorb moisture around the metal, thereby preventing the moisture from affecting the metal; the hydrophobic layer is located outside the hydrophilic layer to prevent excessive infiltration of moisture, thereby maintaining the hydrophobic state of the metal surface.

[0019] (2) The present application obtains the multifunctional surface care material by in-situ polymerization. During the in-situ polymerization, when the organic complex layer and the hydrophilic layer are simultaneously generated, cross-linking can also occur, thereby ensuring the chemical bonding between the two layers. The hydrophobic layer aliphatic compound can be an alkane, an alkene or an alkyne. When the organic complex layer and the hydrophilic layer are simultaneously generated, a substitution reaction is carried out to form a hydrophobic layer with a long hydrocarbon chain on the outer layer of the hydrophilic layer. The hydrophobic layer can also be a polymer formed by alkenyl or alkyne groups. When the organic complex layer and the hydrophilic layer are simultaneously generated, a cross-linking reaction is carried out to cross-link with the organic complex layer and the hydrophilic layer, thereby covering the hydrophilic layer. At the same time, when the hydrophilic layer is generated, a large amount of heat is generated, which heats the organic complex layer to remove moisture and increase the molecular weight of the organic complex layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of a multifunctional surface care material provided in one embodiment of the present application;

[0021] FIG2 is a schematic structural diagram of a multifunctional surface care material provided in one embodiment of the present application.

[0022] The reference numerals in the drawings are as follows: 1 Metal 2 Organic complex layer 3 Hydrophilic layer 4 Hydrophobic layer DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions and advantages of this application more clear, this application is further described in detail below. However, it should be understood that the description herein is only used to explain this application and is not intended to limit the scope of this application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended solely for the purpose of describing specific embodiments and are not intended to limit this application. The reagents and instruments used herein are commercially available, and the characterization methods involved can be found in the relevant descriptions in the prior art and will not be further elaborated herein.

[0025] In order to further understand the present application, the present application is further described in detail below in conjunction with the best embodiment.

[0026] Example 1

[0027] This embodiment provides a multifunctional surface care material, comprising: an organic complex layer connected to the metal product, a hydrophilic layer connected to the organic complex layer, and a hydrophobic layer coating the gel structure; the organic complex layer is a complex formed by silicone and free iron in the metal product; the water-absorbing layer is a network or gel structure containing a hydrophilic group; and the hydrophobic layer is an aliphatic compound.

[0028] As shown in Figure 1, the organic complex layer is in direct contact with the metal surface, the hydrophilic layer is located outside the organic complex layer, and the outermost layer is the hydrophobic layer. The hydrophobic layer makes the metal surface hydrophobic, reducing the possibility of rust; the hydrophilic layer absorbs moisture that enters the metal surface, preventing further diffusion and contact between the water and the metal; the organic complex layer complexes with the free iron in the metal, further reducing the possibility of rust; and it also repairs defects on the metal surface, preventing further exposure of metal elements.

[0029] Silicones include polysiloxanes substituted with alkyl, alkenyl or alkynyl groups; they can be polysiloxanes with saturated groups or unsaturated polysiloxanes, such as those containing alkenyl, alkynyl, etc.; unsaturated polysiloxanes can also undergo addition reactions with hydrophilic layers or water-absorbing layers during polymerization to form more complex structures.

[0030] Polysiloxane is an organic polymer with a silicon-oxygen-silicon structure. It can maintain its physical properties over a wide temperature range, which makes it suitable for weapons and equipment that need to operate in severe cold conditions. It also has outstanding low-temperature flexibility.

[0031] The network or gel structure containing hydrophilic groups includes polymers of enols, enolic acids or enamides with or without substituents; the resulting polymers have good water solubility and high chemical activity due to the presence of hydroxyl groups, carboxyl groups or amide groups and the ease of forming hydrogen bonds; and can be grafted and cross-linked with the organic complex layer during polymerization, thereby forming a tight connection with the organic complex layer.

[0032] Aliphatic compounds are substituted alkyl, alkenyl, alkynyl groups, and / or polymers formed from alkenyl and alkynyl groups. Alkyl, alkenyl, and alkynyl groups containing substituents may be halogens, such as F, Cl, Br, and I. The carbon number of the alkyl, alkenyl, and alkynyl group is C5 to C20. Preferably, the alkyl, alkenyl, and alkynyl group may be a chain alkyl, cycloalkyl, cycloalkenyl, bicycloalkyl, chain alkenyl, aryl, naphthyl, biphenyl, or chain alkynyl. Polymers formed from substituted alkenyl and alkynyl groups include high molecular weight organic compounds formed by the polymerization of chain alkenyl, cyclic alkenyl, or chain alkynyl groups. Examples of these polymers include polyethylene, polypropylene, and polydibutylene. Examples of substituted polymers include vinyl chloride and allyl chloride.

[0033] The organic complex layer also reacts in situ with the hydrophobic layer to form a cross-linked structure; as shown in Figure 2, the cross-linked structure formed by the organic complex layer and the hydrophobic layer, through mutual cross-linking between the layers, makes the structure of the metal surface a large whole, firmly attached to the surface of the metal, and plays a role in repairing and protecting the metal.

[0034] When the organic complex layer is an unsaturated polysiloxane, for example, containing alkenyl groups, alkynyl groups, etc., it can undergo an addition reaction with the polymer formed by the alkenyl groups and alkynyl groups of the hydrophobic layer to form a large network structure; it can also undergo a substitution reaction with the alkyl, alkenyl, and alkynyl groups containing substituents in the hydrophobic layer to form a large network structure; thereby, the hydrophilic layer is coated in the middle of the hydrophobic structure, further reducing the infiltration of water.

[0035] The thickness of the organic complexing layer is 7 to 15 μm and can be 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, or 15 μm. If the organic complexing layer is too thin, the hydrophilic layer is too close to the metal surface, and water in the hydrophilic layer is more likely to come into contact with the metal, causing faster metal corrosion. If the thickness is too thick, it is not conducive to heat conduction, causing local overheating and hindering heat dissipation from the metal surface.

[0036] The hydrophilic layer is 1 to 5 μm thick and can be 1 μm, 2 μm, 3 μm, 4 μm, or 5 μm. If the hydrophilic layer is too thick, the hierarchical structure of the metal surface will be too soft and the viscosity will increase. In addition, it will also store too much water, increasing the load on the metal surface and hindering the drying of the metal surface. If the hydrophilic layer is too thin, it will not be able to effectively absorb water, allowing water to easily come into contact with the metal.

[0037] The hydrophobic layer is 5 to 10 μm thick. The hydrophobic layer needs to be of a certain thickness to block water vapor, but if it is too thick, the heat transfer efficiency will be too slow.

[0038] Example 2

[0039] This embodiment provides a method for preparing a multifunctional surface care material. The multifunctional surface care material is the same as that described in Example 1 and will not be described in detail here.

[0040] The method comprises: (1) adding a precursor monomer of organosilicon into solvent I to obtain solution I; (2) adding a precursor having a network or gel structure containing a hydrophilic group into solvent II to obtain solution II; (3) adding a precursor of an aliphatic compound into solvent III to obtain solution III; and (4) applying solution I, solution II and solution III in sequence to the surface of a metal product and curing them to obtain the multifunctional surface maintenance material.

[0041] The precursor monomer of the organosilicon includes a halogen-substituted silane, and the halogen is preferably chlorine, that is, the precursor monomer of the organosilicon preferably includes a chlorosilane; the precursor monomer can be a halogen-substituted silane with a saturated group, for example, dimethyldichlorosilane, methyltrichlorosilane, diethyldichlorosilane, methylethyldichlorosilane, dipropyldichlorosilane, ethylpropyldichlorosilane, methylpropyldichlorosilane, dibutyldichlorosilane, ethyltrichlorosilane, propyltrichlorosilane, butyltrichlorosilane, etc.; the precursor monomer can be an unsaturated halogen-substituted silane, for example, methyl-propylene-dichlorosilane, methyltrichlorosilane, etc.

[0042] The solvent I is preferably water. The precursor monomer of the organosilicon can undergo a hydrolysis reaction in water.

[0043] In step (1), the organosilicon precursor monomer undergoes a hydrolysis reaction to generate an intermediate containing a hydroxyl group. The molar ratio of solvent I to the organosilicon precursor monomer is not less than 3:1, preferably (3-10):1, and can be 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1 or 10:1. At this ratio, the organosilicon precursor monomer undergoes a hydrolysis reaction to the greatest extent without undergoing a dehydration or dehydrochlorination reaction, that is, in this step, the amount of polysiloxane generated is relatively small; the purpose is to minimize the early polymerization reaction as the subsequent in-situ polymerization is to be carried out.

[0044] The precursor of the network or gel structure containing a hydrophilic group includes an olefinic alcohol, an olefinic acid or an olefinic amide with or without a substituent; for example, it can be propylene alcohol, acrylic acid or acrylamide with or without a substituent.

[0045] Solution II also includes an initiator, which includes an inorganic initiator and / or an organic initiator.

[0046] Inorganic initiators include potassium persulfate, ammonium persulfate, sodium perbromide or hydrogen peroxide.

[0047] Organic initiators include benzoyl peroxide, lauroyl peroxide, tert-butyl hydroxy peroxide, azobisisobutyronitrile, azobisdimethylvaleronitrile, sodium azobiscyanovalerate, and the like.

[0048] Solvent II is water. After the precursor of the network or gel structure containing a hydrophilic group is mixed with water, an initiator is added before coating to prevent premature polymerization.

[0049] The preferred mass ratio of the initiator to the precursor of the network or gel structure containing a hydrophilic group is 1:(10-30). The precursor of the network or gel structure containing a hydrophilic group is dissolved in water, and then the initiator is added and quickly coated on the metal surface.

[0050] The precursor of the aliphatic compound is an alkyl group, an alkenyl group, an alkynyl group containing a substituent and / or a polymer formed by an alkenyl group or an alkynyl group containing a substituent.

[0051] When the precursor of the aliphatic compound is an alkyl, alkenyl or alkynyl group with or without a substituent, it is preferably a halogen-substituted alkyl, alkenyl or alkynyl group, which can be a C5 to C20 halogenated alkyl, alkenyl or alkynyl group; for example, perfluorobutylethylene and cyclopentene.

[0052] When the aliphatic compound is a polymer, the aliphatic compound precursor is a polyolefin or polyalkyne containing a substituent, which may be polyvinyl chloride, polypropylene chloride, polydichloroprene, polychloroprene, polychloropentene, or the like.

[0053] By grafting and cross-linking with the organic complex layer and the hydrophilic layer, the heat resistance, wear resistance and corrosion resistance of the aliphatic compound can be greatly improved, thus better meeting the needs of metal products.

[0054] The precursor of the aliphatic compound is dissolved in an organic solvent, a catalyst is added, and then the metal surface is coated. The catalyst includes organic catalysts and / or inorganic catalysts; organic catalysts include tin salts, metal halides, sulfates, etc.; inorganic catalysts include potassium hydroxide, sodium carbonate, or sodium bicarbonate, etc.

[0055] The solvent III is water; the solution III also includes a dispersant and an initiator; the dispersant includes one of gelatin, polyvinyl alcohol, carboxymethyl cellulose or hydroxypropyl cellulose; the initiator includes one or more mixtures of diisopropyl peroxydicarbonate, azobisisoheptonitrile, lauroyl peroxide, acetyl cyclohexanesulfonic acid or dicyclohexyl peroxydicarbonate.

[0056] When solution I is applied to the metal surface, it is partially dried so that the layer generates a low polymer of polysiloxane, which can partially adhere to the metal surface; then solution II is applied on top of the first layer and also partially dried so that the organic complex layer and the hydrophilic layer are partially cross-linked; finally, solution III is applied.

[0057] After all coating is completed, heating and curing are performed to finally obtain a multifunctional surface maintenance material.

[0058] The curing conditions are: temperature of 50-80°C and time of 20-60 minutes.

[0059] During heating, the exothermic polymerization reaction of the hydrophilic layer further dehydrates or dehydrochlorinates the organic complex layer, leading to the formation of large quantities of polysiloxane and an increase in its molecular weight. Simultaneously, the polysiloxane crosslinks with the hydroxyl, carboxyl, or amide groups of the hydrophilic layer, enhancing the connection between the two layers. Furthermore, the moisture released by the organic complex layer partially hydrates the hydrophilic layer, slightly decreasing its degree of polymerization and forming a gel or network structure with a certain degree of elasticity. Due to the heat released by the hydrophilic layer, the temperature of the hydrophobic layer also rises significantly, causing it to undergo condensation or crosslinking reactions with the hydrophilic layer, ultimately forming a multifunctional surface care material with a three-layer structure.

[0060] Example 3

[0061] According to the content of this application, the multifunctional surface care material of Example 1 and the preparation method of Example 2 are specifically described as follows:

[0062] Test Example 1

[0063] (1) Add 150 parts of dimethyldichlorosilane to 450 parts of water and mix well to obtain solution I. Apply solution I to the surface of 416 stainless steel and air-dry for 5 minutes.

[0064] (2) Dissolve 20 parts of acrylamide in 180 parts of water, mix well, add 1 part of ammonium persulfate, and quickly apply it on the surface of step (1), and air-dry for 5 minutes.

[0065] (3) Weigh 100 parts of vinyl chloride, 0.8 parts of polyvinyl alcohol, 120 parts of deionized water, 0.1 parts of diisopropyl peroxydicarbonate, and 0.1 parts of potassium hydroxide, and mix them evenly to obtain solution III; then apply the solution to the surface of step (2).

[0066] (4) The metal obtained in step (3) is then heated in a nitrogen atmosphere at a temperature of 60° C. for 60 min until the temperature of the metal surface drops to room temperature, thereby obtaining a multifunctional surface care material.

[0067] Test Example 2

[0068] (1) Add 150 parts of vinyltrichlorosilane to 450 parts of water and mix well to obtain solution I. Apply solution I to the surface of 416 stainless steel and air-dry for 5 minutes.

[0069] (2) Dissolve 20 parts of acrylic acid in 180 parts of water, mix well, add 1 part of ammonium persulfate, and quickly apply it on the surface of step (1), and air-dry for 5 minutes.

[0070] (3) Weigh 100 parts of polyvinyl chloride, 0.8 parts of polyvinyl alcohol, 120 parts of deionized water, 0.1 parts of ammonium persulfate, and 1 part of triazole dimercaptoamine salt and mix them evenly to obtain solution III; then apply the solution to the surface of step (2).

[0071] (4) The metal obtained in step (3) is then heated in a nitrogen atmosphere at a temperature of 60° C. for 60 min until the temperature of the metal surface drops to room temperature, thereby obtaining a multifunctional surface care material.

[0072] Test Example 3

[0073] (1) Add 150 parts of methyl-acryl-dichlorosilane to 450 parts of water and mix well to obtain solution I. Apply solution I to the surface of 416 stainless steel and air-dry for 5 minutes.

[0074] (2) Dissolve 20 parts of acrylamide in 180 parts of water, mix well, add 1 part of ammonium persulfate, and quickly apply it on the surface of step (1), and air-dry for 5 minutes.

[0075] (3) Weigh 100 parts of cyclopentene, 120 parts of toluene, and 1 part of aluminum chloride and mix them evenly to obtain solution III; then quickly apply it to the surface of step (2).

[0076] (4) The metal obtained in step (3) is then heated in a nitrogen atmosphere at a temperature of 60° C. for 60 min until the temperature of the metal surface drops to room temperature, thereby obtaining a multifunctional surface care material.

[0077] Test Example 4

[0078] (1) Add 150 parts of methyl-acryl-dichlorosilane to 450 parts of water and mix well to obtain solution I. Apply solution I to the surface of 416 stainless steel and air-dry for 5 minutes.

[0079] (2) Dissolve 20 parts of acrylamide in 180 parts of water, mix well, add 1 part of ammonium persulfate, and quickly apply it on the surface of step (1), and air-dry for 5 minutes.

[0080] (3) Weigh 100 parts of 6-bromo-1-hexene, 120 parts of methanol, and 1 part of chloroplatinic acid, mix them evenly to obtain solution III; then quickly apply it to the surface of step (2).

[0081] (4) The metal obtained in step (3) is then heated in a nitrogen atmosphere at a temperature of 60° C. for 60 min until the temperature of the metal surface drops to room temperature, thereby obtaining a multifunctional surface care material.

[0082] Comparative Example 1

[0083] It is roughly the same as Experimental Example 1, except that step (3) is missing, that is, there is no hydrophobic layer. The rest is the same as Experimental Example 1.

[0084] Comparative Example 2

[0085] It is roughly the same as Experimental Example 1, except that step (1) is missing, that is, there is no organic complexing layer. Others are the same as Experimental Example 1.

[0086] Comparative Example 3

[0087] It is roughly the same as Experimental Example 1, except that step (2) and step (3) are missing, that is, there is no hydrophilic layer and hydrophobic layer, and the rest is the same as Experimental Example 1.

[0088] Comparative Example 4

[0089] 416 stainless steel surface without any treatment

[0090] Performance Testing

[0091] (1) The state of iron in the metal surface was tested. When free iron is present, the free iron easily reacts with water. The test method is the blue dot test, which is as follows: 5 grams of potassium ferrocyanide K3[Fe[CN]6], 1 milliliter of 98% sulfuric acid, 5 milliliters of 36% hydrochloric acid, and an appropriate amount of distilled water are added to prepare a solution with a total volume of 100 milliliters (prepared immediately before use); the solution is directly applied or dripped onto the metal surfaces of the test examples and the comparative examples, and the appearance of blue dots is observed, that is, whether blue dots appear and when the blue dots appear.

[0092] The basic principle of the blue dot test is that if there is ferrous ion contamination on the surface, there will be ferrous ions, and then the following reaction will occur;

[0093] 3Fe2 + +2[Fe[CN6]] - =Fe3[Fe[CN]6]2 dark blue precipitate can be used to test whether passivation treatment has been performed and to test the passivation effect.

[0094] The time for blue spots to appear in Comparative Example 2 and Comparative Example 4 is 15 minutes, indicating that there is a certain amount of free iron; no blue spots appear in Test Examples 1 to 4, Comparative Example 1 and Comparative Example 3 after 24 hours, indicating that the amount of free iron is almost non-existent, that is, the organic complex layer of the present application can be combined with free iron and has good anti-corrosion performance.

[0095] (2) Neutral salt spray test was carried out on the test examples and comparative examples respectively. The results are shown in Table 1:

[0096] As shown in Table 1, in Comparative Example 1, there is no hydrophobic layer and the hydrophilic layer cannot be protected, so too much water accumulates in the hydrophilic layer, making it easier to contact the metal and causing rust to form more quickly. Comparative Example 2, due to the lack of an organic complexing layer, is unable to complex free iron; while the hydrophilic layer is in direct contact with the metal, although it can absorb a certain amount of water from the inside of the metal, due to this characteristic of the hydrophilic layer, the water is in contact with the metal for a longer time, making the degree of rust more serious. Comparative Example 3 only contains an organic complexing layer. Although it can delay the time of rusting to a certain extent, due to the limited effect of siloxane, it cannot protect the metal surface for a long time. Comparative Example 4 has no protection and rusts first. Test Examples 1 to 4 of the present application have complete organic complexing layers, hydrophilic layers and hydrophobic layers, and the layers are cross-linked and bonded to each other to form a stable network structure. The hydrophobic layer can reject most moisture intrusion, and the hydrophilic layer can firmly lock the moisture inside the metal and the moisture that penetrates in, preventing it from extending to the metal layer; the organic complexing layer complexes with the free iron in the metal, further preventing the free iron from oxidizing and rusting.

[0097] (3) After being frozen at low temperature (-30℃) for 24 hours, a neutral salt spray test was performed. The results are shown in Table 2:

[0098] As shown in Table 2, Test Examples 1 to 4 of the present application are almost the same as before freezing, which is far superior to the existing technology. The layers are cross-linked with each other, which greatly improves the low-temperature resistance of each layer and can maintain good performance after low temperature.

[0099] In Comparative Example 1, the hydrophilic layer is directly exposed to air, resulting in a high concentration of water. After freezing, the gel structure solidifies, losing its ability to retain water, causing it to flow to the metal surface. In Comparative Example 2, the free iron is not complexed, and the hydrophilic layer solidifies, losing its ability to retain water. Furthermore, the excessive moisture on the metal surface accelerates rusting. Comparative Example 3 contains an organic complexing layer, but due to its single-layer structure, the degree of grafting and cross-linking is insufficient, resulting in a slight decrease in low-temperature resistance and rust resistance. In Comparative Example 4, freezing causes changes in the metal's internal lattice, further exacerbating rust.

[0100] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements or improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A multifunctional surface care material, characterized in that: include: An organic complexing layer connected to the metal product, a hydrophilic layer connected to the organic complexing layer, and a hydrophobic layer covering the gel structure; The organic complex layer is a complex formed by organic silicon and free iron in the metal product; The hydrophilic layer is a mesh or gel structure containing a hydrophilic group; the hydrophobic layer is an aliphatic compound.

2. The multifunctional surface care material according to claim 1, characterized in that: The organosilicon includes polysiloxane substituted with alkyl, alkenyl or alkynyl groups; the network or gel structure containing hydrophilic groups includes polymers of enol, alkenyl acid or alkenyl amide containing or not containing substituents; the aliphatic compound is a polymer formed by alkyl, alkenyl, alkynyl and / or alkenyl, alkynyl groups containing substituents.

3. The multifunctional surface care material according to claim 1, characterized in that: The organic complex layer also reacts with the hydrophobic layer in situ to form a cross-linked structure.

4. The multifunctional surface care material according to claim 1, characterized in that: The thickness of the organic complex layer is 7-15 μm; the thickness of the hydrophilic layer is 1-5 μm; and the thickness of the hydrophobic layer is 5-10 μm.

5. A method for preparing the multifunctional surface care material according to any one of claims 1 to 4, characterized in that: include: (1) adding a precursor monomer of organosilicon to a solvent I to obtain a solution I; (2) adding a precursor of a network or gel structure containing a hydrophilic group into solvent II to obtain solution II; (3) adding a precursor of an aliphatic compound into solvent III to obtain solution III; (4) Applying solution I, solution II and solution III to the surface of the metal product in sequence and curing the solution to obtain the multifunctional surface care material.

6. The preparation method according to claim 5, characterized in that: The curing conditions are: temperature of 50-80°C and time of 20-60 minutes.

7. The preparation method according to claim 5, characterized in that: In step (1), the solvent I is water, and the precursor monomer of the organosilicon undergoes a hydrolysis reaction with water.

8. The preparation method according to claim 5, characterized in that: The precursor monomer of the organic silicon includes chlorine-containing silane.

9. The preparation method according to claim 5, characterized in that: The molar ratio of solvent I to the precursor monomer of organic silicon is not less than 3:

1.

10. Use of the multifunctional surface care material according to any one of claims 1 to 4 on the surface of metal products.

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