Paint for frost retardant coating, method for producing same and use thereof

Abstract

The present invention provides a paint for a frost-retardant coating, a manufacturing method thereof, and uses thereof. The paint contains, as components, 30% to 50% by mass of a graft-modified polymer, 1% to 15% by mass of a functional auxiliary, and the remainder being a first solvent, where the graft-modified polymer is a polymer produced by mixing reactants, which include a hydrophilic polymer, a hydrophobic polymer, a graft-modifying auxiliary, and a second solvent. The frost-retardant coating of the present invention combines the advantages of both hydrophilic and hydrophobic coatings. When applied to heat exchanger fins, it allows water droplets to slide off quickly without leaving any visible water marks, thereby preventing the formation of thick frost on the surface of the heat exchanger fins when working in frost-prone conditions.

Description

[Technical Field]

[0001] The present invention relates to the technical field of paints, in particular to paints for frost retardant coatings, their preparation method and their use. [Background technology]

[0002] The fins of air conditioner heat exchangers are often made of aluminum foil coated with a hydrophilic coating. With technological advances and industry trends toward environmental protection and energy conservation, air conditioner factories are increasingly demanding the functionality of hydrophilic coated aluminum foil. When outdoor air conditioners used in residential and commercial buildings experience low outdoor temperatures (around 0°C) and high ambient humidity, frost builds up on the heat exchanger, adversely affecting heat exchange efficiency. To address this issue, almost all outdoor units employ reverse cycle defrosting. This operation requires an additional 10-15% of power consumption, increasing energy consumption. Improving this phenomenon has become a key issue in the development of coatings for outdoor units.

[0003] In principle, the frosting process in a heat exchanger is essentially a process in which the heat exchanger acquires the latent heat of water vapor in the air. Immediately after transferring its latent heat of liquefaction to the heat exchanger surface, the water vapor loses its latent heat of evaporation and forms solid frost particles that adhere to the heat exchanger surface. During this process, some frost particles are blown away from the frost layer surface by the wind, but many frost particles accumulate, thickening the frost layer. Water vapor in the air first undergoes heterogeneous nucleation on the cold surface, and the condensation nuclei continue to grow and coalesce to form macroscale condensation droplets. As the temperature of the droplets drops and they freeze, frost crystals form on the surface of the frozen droplets. These frost crystals continue to grow, gradually forming a frost layer. When the degree of supercooling on the frost layer surface approaches zero, the frost layer stops growing vertically, and water vapor diffuses into the gaps in the frost layer, forming frost crystals, increasing the density of the frost layer.

[0004] Based on this, the key to solving this problem is to reduce the probability of water vapor in the air forming droplets on the heat exchanger surface or to prevent droplets from remaining on the heat exchanger surface. The former is limited by the external climate, leaving little room for human improvement and research still incomplete. The latter calls for new requirements for heat exchanger coatings. Research has shown that applying a hydrophilic treatment to heat exchanger fins improves water repellency and makes it difficult for water vapor to form droplets, but leaves visible traces of water droplets, resulting in the formation of thick frost. Conversely, applying a hydrophobic treatment to heat exchanger fins makes it difficult for water droplets to slide off. After condensation, the water vapor remains on the fins as sparse droplets, forming sparse frost over time. However, because the droplets are difficult to slide off, they clog the drainage channel when the air conditioner continues to operate, significantly affecting its normal operation.

[0005] Patent application number CN112322164A discloses a surface treatment agent capable of delaying frost formation on the aluminum fins of a radiator. This surface treatment agent is applied to the surface of the aluminum fins of a radiator to form a coating, thereby delaying frost formation. However, the material used in this invention is limited to expensive polyurethane resin, and the effect of delaying frost formation is unclear, so rational industrial production has not yet been achieved.

[0006] Patent application number CN102549079A discloses a resin material with excellent frost-inhibiting properties, and produces a laminated metal plate capable of suppressing frost. However, the structure actually produced in this invention is a three-layer structure of frost-inhibiting resin-inorganic oxide (organic-inorganic complex oxide)-metal plate, and the introduction of the inorganic oxide layer increases the difficulty of processing and increases manufacturing costs. Furthermore, this invention does not disclose the specific composition of the intermediate layer material used, whether it has an odor, compatibility, or other effects. Summary of the Invention [Problem to be solved by the invention]

[0007] In response to the technical problems that exist in conventional heat exchanger fins, such as the tendency for frost to form and the difficulty for water droplets to slide off, the present invention provides a paint for a frost-retardant coating, a manufacturing method thereof, and use thereof. [Means for solving the problem]

[0008] In one aspect, the present invention provides a paint for frost-retardant coatings, which comprises, as components, 30% by mass to 50% by mass of a graft-modified polymer, 1% by mass to 15% by mass of a functional auxiliary, and the remainder being a first solvent, where the graft-modified polymer is a polymer produced by mixing reactants, the reactants including a hydrophilic polymer, a hydrophobic polymer, a graft-modifying auxiliary, and a second solvent, and the graft-modified polymer has an alternating structure of hydrophilic microdomains and hydrophobic microdomains, and which exhibits frost-retardant performance macroscopically.

[0009] Optionally, the hydrophilic polymer is obtained by copolymerizing a monomer including at least one of an amide monomer and a sulfonic acid monomer with an acrylic acid monomer, wherein the mass of the acrylic acid monomer is 50% to 80% of the mass of the hydrophilic polymer, and the structural formula of the hydrophilic polymer is represented by Formula 1. JPEG2026507382000002.jpg15170 Formula I (In Formula I, a, b, c, d, and e are not all 0, and f is an integer greater than 0.)

[0010] Optionally, the hydrophobic polymer is obtained by copolymerizing a monomer including at least one of a vinyl monomer and a silicone monomer with a fluorine-containing monomer, wherein the mass of the fluorine-containing monomer is 10% to 40% of the mass of the hydrophobic polymer, and the fluorine content of the fluorine-containing monomer is 20% to 70%.

[0011] Optionally, the graft modification coagent comprises at least one of a silane coupling agent and a titanate coupling agent, wherein the silane coupling agent comprises one or more of γ-aminopropyltriethoxysilane and vinyltriethoxysilane, and the titanate coupling agent comprises an oxoacetoxy chelate-type titanate coupling agent.

[0012] Optionally, the mass of the hydrophilic polymer is 20% to 50% of the mass of the graft-modified polymer, the mass of the hydrophobic polymer is 10% to 30% of the mass of the graft-modified polymer, the mass of the graft-modification aid is 0.1% to 5% of the mass of the graft-modified polymer, and the second solvent includes water.

[0013] Optionally, the first solvent comprises an organic solvent and water, and the weight of the organic solvent is 0.1% to 5% of the weight of the paint for the frost retardant coating.

[0014] Optionally, the organic solvent comprises an alcohol-based solvent and / or an ether-based solvent, wherein the alcohol-based solvent comprises one or more of ethanol, isopropyl alcohol, and butanol, and the ether-based solvent comprises one or more of ethylene glycol ethyl ether and ethylene glycol tert-butyl ether.

[0015] Optionally, the functional aids include one or more of a curing agent, an antifoaming agent, a wetting agent, and a rheology aid; the curing agent contains at least one of a polyisocyanate compound and a cyanamide compound, The antifoaming agent contains at least one of a silicone compound and a mineral oil, the wetting agent includes at least one of a siloxane compound and a fluorocarbon compound; The rheology aid comprises a polyurethane associative compound.

[0016] In another aspect, the present invention also provides a method for producing a pharmaceutical composition comprising: dissolving the hydrophilic polymer in the second solvent, and then adding the hydrophobic polymer and the graft-modifying aid to the hydrophilic polymer in this order, and reacting them to obtain the graft-modified polymer; and (c) dissolving 1% to 15% of a functional auxiliary in the first solvent, and then adding 30% to 50% of a graft-modified polymer to the functional auxiliary and stirring to obtain the frost-retardant coating paint.

[0017] In another aspect, the present invention also provides use of the paint for a frost-retardant coating according to any one of the above in the field of surface treatment of fins of a heat exchanger for an air conditioner.

[0018] Optionally, a paint for a frost-retardant coating as described above can be applied to the anticorrosion primed surface of the fin to form a coating with frost-retardant properties. [Effects of the Invention]

[0019] In the present invention, the graft-modified polymer is prepared by mixing reactants, the reactants including a hydrophilic polymer and a hydrophobic polymer, so that the frost-retardant coating paint containing the graft-modified polymer has an alternating structure of hydrophilic and hydrophobic parts, and combines the advantages of both hydrophilic and hydrophobic coatings. When applied to the fins of a heat exchanger, the paint can quickly slide off water droplets without leaving any obvious water marks, and can greatly reduce the amount of water marks remaining on the coating, thereby preventing thick frost from forming on the surface of the heat exchanger and reducing the frequency of frost on the outdoor unit. The frost-retardant coating paint of the present invention has a simple production process, low requirements for production equipment, no waste during production, and is environmentally friendly. [Brief explanation of the drawings]

[0020] [Figure 1] This is an experimental device for simulating the application of frost retardant coating paint. [Figure 2] The test pieces of Example 1 and Comparative Example 1 were obtained by simulating them using the apparatus shown in FIG. [Figure 3] 1 is a microphotograph and comparison of the microphotographs of simulated freezing and thawing of test specimens of Example 1 and Comparative Example 1. [Figure 4] 1 is a schematic diagram of a frost retardant coating according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to examples. It should be understood that the specific examples described herein are for the purpose of illustrating the present invention, but are not intended to limit the present invention.

[0022] To illustrate the technical solutions of the present invention, the following provides specific examples.

[0023] In one embodiment of the present invention, a paint for a frost-retardant coating contains, as components, 30% to 50% by mass of a graft-modified polymer, 1% to 15% by mass of a functional aid, and the remainder being a first solvent, where the mass is 100%. The graft-modified polymer is a polymer produced by mixing reactants, which are a hydrophilic polymer, a hydrophobic polymer, a graft-modification aid, and a second solvent.

[0024] In this embodiment, the graft-modified polymer is prepared by mixing reactants, the reactants including a hydrophilic polymer and a hydrophobic polymer, so that the frost-retardant coating paint containing the graft-modified polymer has an alternating structure of hydrophilic and hydrophobic parts, and combines the advantages of both hydrophilic and hydrophobic coatings. When applied to the fins of a heat exchanger, it can quickly slide off water droplets without leaving obvious water marks, and can greatly reduce the amount of water marks remaining on the coating, thereby preventing thick frost from forming on the surface of the heat exchanger and reducing the frequency of frost on the outdoor unit. The frost-retardant coating paint of the present invention has a simple manufacturing process, low requirements for production equipment, no waste during production, and is environmentally friendly.

[0025] In some embodiments of the present invention, the hydrophilic polymer is obtained by copolymerizing a monomer including at least one of an amide monomer and a sulfonic acid monomer with an acrylic acid monomer, and the mass of the acrylic acid monomer is 50% to 80% of the mass of the hydrophilic polymer, thereby ensuring the hydrophilicity of the hydrophilic polymer. The structural formula of the hydrophilic polymer is shown in Formula 1. JPEG2026507382000003.jpg15170 Formula I (In Formula I, a, b, c, d, and e are not all 0, and f is an integer greater than 0.)

[0026] In some embodiments of the present invention, the hydrophobic polymer is obtained by copolymerizing a monomer including at least one of a vinyl monomer and a silicone monomer with a fluorine-containing monomer, and the mass of the fluorine-containing monomer is 10% to 40% of the mass of the hydrophobic polymer, thereby ensuring the hydrophobicity of the hydrophobic polymer.

[0027] In some embodiments of the present invention, the silicone monomer includes, but is not limited to, polydimethylsiloxane, the fluorine-containing monomer includes, but is not limited to, at least one of polyvinylidene fluoride and polytetrafluoroethylene, and the vinyl monomer includes, but is not limited to, at least one of polyethylene and polypropylene.

[0028] In some embodiments of the present invention, the graft modification coagent comprises at least one of a silane coupling agent and a titanate coupling agent, the silane coupling agent comprising one or more of γ-aminopropyltriethoxysilane and vinyltriethoxysilane, and the titanate coupling agent comprising an oxoacetoxy chelate-type titanate coupling agent.

[0029] In some embodiments of the present invention, the mass of the hydrophilic polymer is 20% to 50% of the mass of the graft-modified polymer, the mass of the hydrophobic polymer is 10% to 30% of the mass of the graft-modified polymer, the mass of the graft-modification auxiliary is 0.1% to 5% of the mass of the graft-modified polymer, and the second solvent includes water.

[0030] In some embodiments of the present invention, the first solvent comprises an organic solvent and water, and the mass of the organic solvent is 0.1% to 5% of the mass of the frost retardant coating paint.

[0031] In some embodiments of the present invention, the organic solvent comprises an alcoholic solvent and / or an etheric solvent, the alcoholic solvent comprising one or more of ethanol, isopropyl alcohol, and butanol, and the etheric solvent comprising one or more of ethylene glycol ethyl ether and ethylene glycol tert-butyl ether.

[0032] In some embodiments of the present invention, the functional aids include one or more of a curing agent, an antifoaming agent, a wetting agent, and a rheology aid.

[0033] The curing agent includes at least one of a polyisocyanate compound and a cyanamide compound.

[0034] The antifoaming agent includes at least one of a silicone compound and a mineral oil.

[0035] The wetting agent includes at least one of a siloxane compound and a fluorocarbon compound.

[0036] The rheology aid comprises a polyurethane associative compound.

[0037] In another aspect, an embodiment of the present invention also comprises: dissolving the hydrophilic polymer in the second solvent, and then sequentially adding the hydrophobic polymer and the graft-modifying aid to the hydrophilic polymer and reacting them to obtain the graft-modified polymer;

[0038] and (c) dissolving 1% to 15% of a functional auxiliary in the first solvent, and then adding 30% to 50% of a graft-modified polymer to the functional auxiliary and stirring to obtain the frost-retardant coating paint.

[0039] Specifically, in some examples of the present invention, 30 to 50 parts by mass of a hydrophilic polymer and 15 to 50 parts by mass of water were added to a vessel and stirred uniformly at 200 to 600 rpm at 50 to 150°C under a nitrogen atmosphere. Subsequently, 0.1 to 5 parts by mass of a graft-modifying aid and 10 to 30 parts by mass of a hydrophobic polymer were added while stirring at 200 to 600 rpm, and the mixture was stirred for 5 to 30 minutes to obtain a graft-modified polymer. The total amount of the components, including the hydrophilic polymer, water, organic solvent, graft-modifying aid, and hydrophobic polymer, was 100 parts by mass.

[0040] At 25-30°C, 30-70 parts by mass of water, 0.1-5 parts by mass of an organic solvent, and 1-15 parts by mass of a functional auxiliary were mixed in a container and stirred at 200-600 rpm under normal pressure for 3-10 minutes. After uniform stirring, 30-50 parts by mass of a graft-modified polymer was added, and the mixture was stirred at 500-800 rpm for 5-20 minutes to obtain a uniform emulsion of the frost-retardant coating paint. The total amount of the paint was 100 parts by mass.

[0041] In another aspect, an embodiment of the present invention also provides use of the paint for a frost-retardant coating according to any one of the above in the field of surface treatment of fins of a heat exchanger for an air conditioner.

[0042] In some embodiments of the present invention, a coating having frost-retarding properties can be formed by applying the paint for a frost-retarding coating described in any one of the above to the surface of a fin that has been coated with an anticorrosion primer.

[0043] The present invention will be further illustrated by the following examples, in which all reagents used are commercially available.

[0044] Example 1 S1: Synthesis of graft modified polymers 35 parts by mass of a hydrophilic polymer (a copolymer of acrylic acid monomer and sulfonic acid monomer in a 2:1 mass ratio) and 49.8 parts by mass of water were added to a vessel, nitrogen was introduced, the temperature was raised to 80°C, and the rotation speed was increased to 500 rpm to uniformly stir. Next, 0.2 parts by mass of γ-aminopropyltriethoxysilane and 15 parts by mass of a hydrophobic polymer (a polymer of polyvinylidene fluoride and silicone monomer in a 1:4 mass ratio) were added while stirring, and the mixture was stirred for 5 minutes to obtain a graft-modified polymer.

[0045] S2: Preparation of paint for frost retardant coating At 25-30°C, 52 parts by weight of water, 1 part by weight of ethylene glycol ethyl ether as a solvent, 0.5 parts by weight of polysiloxane as a wetting agent, 2 parts by weight of polyurethane associative rheology aid, and 4.5 parts by weight of cyanamide curing agent were mixed in a container and stirred at 300 rpm for 5 minutes. After uniform stirring, 40 parts by weight of graft-modified polymer was added, the rotation speed was increased to 600 rpm, and the mixture was stirred for 10 minutes to obtain the frost-retardant coating paint as a uniform emulsion.

[0046] In the above S1, the total mass parts of the graft modified polymer is 100 parts, and in S2, the total mass parts of the frost retardant coating material is 100 parts, and the mass parts in S1 and S2 are calculated individually.

[0047] When using this paint, simply apply it as a top coat to a primer that is commonly used for the heat exchanger fins of air conditioner outdoor units.

[0048] Example 2 In this example, S1 contains 40 parts by mass of hydrophilic polymer, 49.5 parts by mass of water, 0.5 parts by mass of γ-aminopropyltriethoxysilane, and 10 parts by mass of hydrophobic polymer.

[0049] In S2, the specific embodiment was the same as in Example 1, except that the water content was 51.8 parts by weight, the solvent ethylene glycol tert-butyl ether was 1 part by weight, the fluorocarbon wetting agent was 0.2 parts by weight, the polyurethane associative rheology aid was 2 parts by weight, the polyisocyanate curing agent was 5 parts by weight, and the graft-modified polymer was 40 parts by weight.

[0050] Example 3 In this example, the specific embodiment was the same as that of Example 1, except that in S1, the hydrophilic resin was obtained by copolymerizing an acrylic acid monomer and an amide monomer in a mass ratio of 2:1.

[0051] Example 4 In this example, the specific embodiment of S1 was the same as that of Example 1, except that the hydrophilic polymer was an acrylic acid monomer polymer.

[0052] Example 5 In this example, the specific embodiment was the same as that of Example 1, except that in S1, the hydrophilic polymer was obtained by copolymerizing an acrylic acid monomer and a sulfonic acid monomer in a mass ratio of 1:2.

[0053] Example 6 In this example, in S1, the specific embodiment was the same as that of Example 1, except that the hydrophobic polymer was obtained by polymerizing polyvinylidene fluoride and silicone monomer in a mass ratio of 1:19.

[0054] Example 7 In this example, the specific embodiment was the same as in Example 1, except that in S2, the graft-modified polymer was 30 parts by mass and the water was 62 parts by mass.

[0055] Example 8 In this example, the specific embodiment was the same as in Example 1, except that in S2, the graft-modified polymer was 50 parts by mass and the water was 42 parts by mass.

[0056] Comparative Example 1 In this comparative example, in S1, the hydrophilic polymer is 50 parts by mass, and 50 parts by mass of water is added without using the hydrophobic polymer or graft modification aid, and the mixture is stirred uniformly to obtain a hydrophilic resin.

[0057] In S2, the graft-modified polymer was changed to the same amount of hydrophilic resin and blended to obtain a comparative sample, and the specific embodiment was the same as that of Example 1.

[0058] Comparative Example 2 In this comparative example, in S1, the hydrophobic polymer was 50 parts by mass, and 50 parts by mass of water was added without using a hydrophilic polymer or a graft modification aid, followed by uniform stirring to obtain a hydrophilic resin.

[0059] In S2, the graft-modified polymer was changed to the same amount of hydrophilic resin and blended to obtain a comparative sample, and the specific embodiment was the same as that of Example 1.

[0060] Comparative Example 3 In this comparative example, the specific embodiment was the same as that of Example 1, except that in S2, the graft-modified polymer was 20 parts by mass and the water was 72 parts by mass.

[0061] Comparative Example 4 In this comparative example, the specific embodiment was the same as in Example 1, except that in S2, the graft-modified polymer was 60 parts by mass and the water was 32 parts by mass.

[0062] Performance testing The frost retardant coating paints of Examples 1 to 8 were applied to fins to form coatings, and the coatings were tested for adhesion, slow water droplet sliding time, and water droplet sliding time after rinsing with water, and the test results are shown in Table 1. The test methods were as follows. Adhesion: Tested by cross-cut test. Water droplet slow sliding time: An aluminum plate coated with a frost-retardant coating was placed vertically, and an 8μL droplet of water was taken with a 10μL dropper and dropped onto the coated surface from the same height. The time it took for the droplet to slide 8cm was recorded. Generally, a sliding time of more than 15 seconds is considered to be an indication that the frost-retardant ability does not meet the requirements. Water droplet sliding time after rinsing: The coating was left in running water for 100 hours, and then removed and the time for water droplets to slide off was tested.

[0063] In addition, a simulation experiment device was prepared, and a low-temperature outdoor environment was simulated using a refrigeration panel 1. Symbol a is a test piece with the frost-retardant coating of Example 1, and symbol b is a hydrophilic test piece of Comparative Example 1. The purpose was to investigate how water droplets slide off the test piece.

[0064] [Table 1]

[0065] As shown in Figure 2, under conditions simulating outdoor low temperatures, water droplets of the same mass were dropped onto two panels, panel a and panel b. After the water droplets slid down due to gravity, it was found that in panel a, the test piece with the frost-retardant coating had almost no water marks, while in panel b, the hydrophilic sample had obvious water marks. The test piece of Example 1 showed a lower probability of frost formation than the test piece of Comparative Example 1.

[0066] As shown in Figure 3, during the ice formation and melting simulation, small water droplets first formed on specimen a, revealing a distinctly uneven image under a microscope. On specimen b, a water film quickly formed, revealing a uniform, flat image. After thawing, specimen a had a water film, which quickly condensed and caused droplets to slide off, leaving little residue on the substrate. On specimen b, the water film remained on the surface for a long time even after thawing due to the blocking effect of the water film. Based on this phenomenon, if the air conditioner continued to operate, specimen a could maintain normal operation for a long time without frosting due to the rapid removal of droplets. On specimen b, the water film continued to block the droplets, eventually forming a thick layer of frost, which affected normal operation. This demonstrated the usefulness of frost-retardant coatings in reducing frost formation at low temperatures (near 0°C).

[0067] As can be seen from the test results of Examples 1 to 3 and Example 6 in Table 1, when the mass of polyvinylidene fluoride in the hydrophobic polymer is 10 to 40% of the mass of the hydrophobic polymer, both the initial water droplet sliding time and the water droplet sliding time after rinsing are less than 10 seconds, and the frost formation retardation ability is excellent. When the mass ratio of polyvinylidene fluoride in the hydrophobic polymer is not 10 to 40%, the water droplet sliding time after rinsing exceeds 20 seconds, and the frost formation retardation ability is lower than that of Examples 1 and 2.

[0068] As can be seen from the test results of Examples 1 and 4-5, when the mass ratio of the acrylic acid monomer in the hydrophilic polymer is 50%-80% of the mass of the hydrophilic polymer, the water droplet sliding time is short and the requirement is met.When the mass ratio of the acrylic acid monomer in the hydrophilic polymer is not 50%-80%, the water droplet sliding time after water washing is too long and the frost formation retardation ability is lower than that of Example 1.

[0069] As can be seen from the test results of Examples 1 and 2 and Comparative Examples 1 and 2, if only a hydrophilic polymer is used in a frost retardant coating paint, neither the initial water droplet sliding time nor the water droplet sliding time after rinsing with water meets the requirements. If only a hydrophobic polymer is used, the water droplet sliding time after rinsing with water does not meet the requirements. Only when a hydrophilic polymer and a hydrophobic polymer are used in combination, do both the initial water droplet sliding time and the water droplet sliding time after rinsing with water meet the requirements.

[0070] As can be seen from the test results of Examples 1, 7 and 8, and Comparative Examples 3 and 4, when the content of the graft-modified polymer in the frost-retardant coating paint is 30% to 50%, the water droplet sliding time meets the requirement. When the content is less than 30% or more than 50%, the water droplet sliding time after rinsing with water exceeds 25 seconds, and the frost-retardant performance does not meet the requirement.

[0071] The above embodiments are only used to explain the technical solutions of the present invention, and are not intended to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may be modified or some of the technical features may be replaced with equivalents. However, these modifications or substitutions do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and all should be included in the protection scope of the present invention.

Claims

1. A paint for frost-retardant coatings, characterized in that the paint contains, as components, 30% by mass to 50% by mass of a graft-modified polymer, 1% by mass to 15% by mass of a functional auxiliary, and the remainder being a first solvent, where the mass is taken as 100%, the graft-modified polymer is a polymer produced by mixing reactants, and the reactants include a hydrophilic polymer, a hydrophobic polymer, a graft-modifying auxiliary, and a second solvent.

2. The frost retardant coating paint according to claim 1, characterized in that the hydrophilic polymer is obtained by copolymerizing a monomer containing at least one of an amide monomer and a sulfonic acid monomer with an acrylic acid monomer, the mass of the acrylic acid monomer being 50% to 80% of the mass of the hydrophilic polymer, and the structural formula of the hydrophilic polymer is represented by Formula 1. Formula I (In Formula I, a, b, c, d, and e are not all 0, and f is an integer greater than 0.)

3. The paint for frost-retardant coating according to claim 1, characterized in that the hydrophobic polymer is obtained by copolymerizing a monomer containing at least one of a vinyl monomer and a silicone monomer with a fluorine-containing monomer, the mass of the fluorine-containing monomer being 10% to 40% of the mass of the hydrophobic polymer, and the fluorine content of the fluorine-containing monomer being 20% ​​to 70%.

4. The frost-retarding coating paint according to claim 1, characterized in that the graft-modifying aid comprises at least one of a silane coupling agent and a titanate coupling agent, the silane coupling agent comprising one or more of γ-aminopropyltriethoxysilane and vinyltriethoxysilane, and the titanate coupling agent comprising an oxoacetoxy chelate-type titanate coupling agent.

5. The paint for frost retarding coating according to claim 1, characterized in that the mass of the hydrophilic polymer is 20% to 50% of the mass of the graft-modified polymer, the mass of the hydrophobic polymer is 10% to 30% of the mass of the graft-modified polymer, the mass of the graft-modification auxiliary is 0.1% to 5% of the mass of the graft-modified polymer, and the second solvent contains water.

6. The frost retarding coating paint according to claim 1, characterized in that the first solvent contains an organic solvent and water, and the mass of the organic solvent is 0.1% to 5% of the mass of the frost retarding coating paint.

7. The paint for frost retarding coating according to claim 6, characterized in that the organic solvent includes an alcohol-based solvent and / or an ether-based solvent, the alcohol-based solvent including one or more of ethanol, isopropyl alcohol, and butanol, and the ether-based solvent including one or more of ethylene glycol ethyl ether and ethylene glycol tert-butyl ether.

8. the functional aids include one or more of a curing agent, an antifoaming agent, a wetting agent, and a rheology aid; the curing agent contains at least one of a polyisocyanate compound and a cyanamide compound, The antifoaming agent contains at least one of a silicone compound and a mineral oil, the wetting agent includes at least one of a siloxane compound and a fluorocarbon compound; 10. The paint for a frost retarding coating of claim 1, wherein the rheological aid comprises a polyurethane associative compound.

9. dissolving the hydrophilic polymer in the second solvent, and then adding the hydrophobic polymer and the graft-modifying aid to the hydrophilic polymer in this order, and reacting them to obtain the graft-modified polymer; The method for producing the paint for frost retarding coating according to any one of claims 1 to 8, further comprising the steps of: dissolving 1% to 15% of the functional auxiliary in the first solvent; then adding 30% to 50% of the graft modified polymer to the functional auxiliary; and stirring the mixture to obtain the paint for frost retarding coating.

10. Use of the paint for frost retardant coating according to any one of claims 1 to 8 in the field of surface treatment of fins of heat exchangers for air conditioners.

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