Self-temperature-control electric heating anti-icing and deicing coating and coating thereof

Abstract

The invention provides a self-temperature-control electric heating anti-icing and de-icing coating and a coating thereof, and belongs to the technical field of anti-icing and de-icing. The self-temperature-control electric heating anti-icing and deicing coating comprises the following raw materials in parts by mass: 1-32 parts of paraffin emulsion; 2-25 parts of a conductive filler; 4 to 40 parts of water-based resin; the solid content of the paraffin emulsion is 8-15%; the paraffin emulsion is prepared from the following raw materials: paraffin, a silane coupling agent, an emulsifier and water. Through interaction of the raw materials in the coating components, the resistance of the self-temperature-control electric heating anti-icing and deicing coating is increased along with the rise of the temperature on the basis of the positive temperature coefficient effect, and the coating can be prevented from being overheated even if high voltage is applied. In a low-temperature icing environment, voltage can be applied to realize electric heating deicing at a low temperature of-30 DEG C.

Description

Technical Field

[0001] The invention relates to the technical field of anti-icing, and in particular to a self-controlled temperature electric heating anti-icing paint and a coating thereof. Background Art

[0002] Surface ice accumulation poses a great safety hazard to transportation, aviation, power transmission and other fields. In order to ensure the safe operation of key equipment and facilities, a variety of anti-icing and de-icing methods are used for ice protection. Existing anti-icing strategies can be divided into active and passive methods. Active anti-icing methods mainly rely on external energy to prevent surface icing, but often require complex adjustment equipment to prevent overheating or excessive energy consumption, and have defects such as high energy consumption, high environmental pollution, and low efficiency. Passive methods are mainly divided into three categories: constructing super-hydrophobic surfaces, porous slippery surfaces injected with liquids, and low-modulus coating materials with special mechanical properties. Although these passive anti-icing methods have low ice adhesion, their durability is poor. The degradation of the interface state and the loss of lubricants under dynamic icing conditions may limit their application.

[0003] In a dynamic icing environment, the most commonly used anti-icing method is to use an electric heating coating for active anti-icing, which usually requires complex regulatory equipment to manage its thermal power density. Patent CN110629151A discloses a new type of electric heating coating and a preparation method thereof, the coating comprising a substrate and an electric heating layer, wherein the electric heating layer comprises a conductive layer, a bonding layer and an electrical insulation layer. Patent CN117946565A discloses an anti-icing electric heating coating structure and a preparation method thereof, comprising a first coating, a second coating and a third coating, which can achieve rapid heating and continuous electric heating working effects. However, none of the above patents mention how to control the surface temperature of the electric heating coating. If the surface temperature of the electric heating coating is too high, it will cause ablation of the electric heating coating and reduce its service life. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a self-controlled temperature electric heating anti-icing paint and its coating. The self-controlled temperature electric heating anti-icing paint provided by the present invention can effectively prevent overheating and ablation of the coating surface and extend its service life.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a self-controlled temperature electric heating anti-icing coating, comprising the following raw materials in parts by weight:

[0007] 1-32 parts of paraffin emulsion;

[0008] 2 to 25 parts of conductive filler;

[0009] 4-40 parts of water-based resin;

[0010] The solid content of the paraffin emulsion is 8-15%; the raw materials for preparing the paraffin emulsion include paraffin, silane coupling agent, emulsifier and water.

[0011] Preferably, the method for preparing the paraffin emulsion comprises the following steps:

[0012] Paraffin wax, silane coupling agent, emulsifier and water are mixed, and heated for emulsification and stirred at room temperature in sequence to obtain a paraffin wax emulsion.

[0013] Preferably, the mass ratio of the paraffin wax to the silane coupling agent and the emulsifier is (15-40):(2-8):(1-6).

[0014] Preferably, the silane coupling agent includes one or more of vinyl trimethoxy silane, vinyl tri (β-methoxyethoxy) silane and γ-glycidyl ether oxypropyl trimethoxy silane;

[0015] The emulsifier includes one or more of cetyltrimethylammonium bromide, hydroxypropyl methylcellulose, sodium lauryl sulfate, OP-10, polyvinyl alcohol and Span 80.

[0016] Preferably, the temperature of the heating emulsification is 60-100°C, the speed is 10000-20000 rpm, and the time is 10-40 min;

[0017] The stirring rate at room temperature is 200-1000 rpm, and the time is 2-6 hours.

[0018] Preferably, the conductive filler includes one or more of graphene, graphite fiber, conductive carbon black and carbon nanotubes.

[0019] Preferably, the water-based resin includes one or more of water-based acrylic resin, water-based fluorine-modified acrylate resin, water-based silicon-modified acrylate resin and water-based epoxy resin.

[0020] The present invention provides the application of the self-temperature-controlled electrically heated anti-icing coating in the field of anti-icing and de-icing.

[0021] The present invention provides a self-temperature-controlled electrically heated anti-icing coating, which is obtained by curing the above-mentioned self-temperature-controlled electrically heated anti-icing coating.

[0022] Preferably, the curing temperature is room temperature and the curing time is 6 to 24 hours.

[0023] The present invention provides a self-controlled temperature electric heating anti-icing coating, comprising the following raw materials by mass: 1 to 32 parts of paraffin emulsion; 2 to 25 parts of conductive filler; 4 to 40 parts of water-based resin; the solid content of the paraffin emulsion is 8 to 15%; the raw materials for preparing the paraffin emulsion include paraffin, silane coupling agent, emulsifier and water. The present invention can form a complete network structure through the conductive filler in the coating component. These conductive networks are very sensitive to the melting and volume expansion of the crystalline phase. As the paraffin melts, the conductive network is easily destroyed, causing the resistance to suddenly increase, thereby producing an obvious positive temperature coefficient effect. The phase change behavior of the paraffin component can realize the self-regulation of resistance, so that the self-controlled temperature electric heating anti-icing coating increases with the increase of temperature based on the positive temperature coefficient effect, and even if a high voltage is applied, the coating can be prevented from overheating. In a low-temperature icing environment, a voltage can be applied to achieve electric heating deicing at a low temperature of -30°C.

[0024] Furthermore, the self-controlled temperature electric heating anti-icing coating provided by the present invention has a simple production process, low cost and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 An optical microscope image of the paraffin emulsion prepared in Example 1;

[0026] Figure 2 The deicing effect of the self-controlled temperature electric heating anti-deicing coating prepared in Example 1;

[0027] Figure 3 This is a graph showing the surface resistivity of the self-controlled temperature electric heating anti-deicing coating prepared in Example 1 as a function of temperature;

[0028] Figure 4 This is the electric heating cycle diagram of the self-controlled temperature electric heating anti-icing coating prepared in Example 1. DETAILED DESCRIPTION

[0029] The present invention provides a self-controlled temperature electric heating anti-icing coating, comprising the following raw materials in parts by weight:

[0030] 1-32 parts of paraffin emulsion;

[0031] 2 to 25 parts of conductive filler;

[0032] 4-40 parts of water-based resin;

[0033] The solid content of the paraffin emulsion is 8-15%; the raw materials for preparing the paraffin emulsion include paraffin, silane coupling agent, emulsifier and water.

[0034] Unless otherwise specified, the raw materials used in the present invention are all commercially available.

[0035] In terms of parts by mass, the self-controlling electric heating anti-icing coating provided by the present invention includes 1 to 32 parts of paraffin emulsion, preferably 1 to 8 parts. As a specific embodiment of the present invention, the amount of the paraffin emulsion can be 1 part, 3 parts, 5 parts, 8 parts, 10 parts, 15 parts, 20 parts, 25 parts, 28 parts or 32 parts. In the present invention, the solid content of the paraffin emulsion is 8 to 15%, preferably 10%. In the present invention, the role of the paraffin emulsion is to undergo phase change when heated, destroy the conductive network, increase the resistance of the coating, and produce a positive temperature coefficient effect.

[0036] In the present invention, the preparation method of the paraffin emulsion preferably comprises the following steps:

[0037] Paraffin wax, silane coupling agent, emulsifier and water are mixed, and heated for emulsification and stirred at room temperature in sequence to obtain a paraffin wax emulsion.

[0038] In the present invention, the silane coupling agent preferably includes one or more of vinyl trimethoxy silane, vinyl tri (β-methoxyethoxy) silane and γ-glycidyl ether oxypropyl trimethoxy silane; in the present invention, the role of the silane coupling agent is to increase the bonding force between paraffin and the resin matrix.

[0039] In the present invention, the emulsifier preferably includes one or more of cetyltrimethylammonium bromide, hydroxypropyl methylcellulose, sodium lauryl sulfate, OP-10, polyvinyl alcohol and Span 80.

[0040] In the present invention, the mass ratio of the paraffin wax to the silane coupling agent and the emulsifier is preferably (15-40): (2-8): (1-6), more preferably 40:2:2, i.e. 20:1:1. In the present invention, the mass ratio of the emulsifier to water is preferably (2-5): (260-600), more preferably 2:400, i.e. 1:200.

[0041] In the present invention, the mixing method is preferably: firstly mix the emulsifier and water to obtain an emulsifier aqueous solution; then add the paraffin wax and the silane coupling agent to the emulsifier aqueous solution. In the present invention, the paraffin wax is preferably added in a molten state.

[0042] In the present invention, the temperature of the heating emulsification is preferably 60-100°C, more preferably 80-100°C; the speed is preferably 10000-20000rpm, more preferably 15000-20000rpm; the time is preferably 10-40min, more preferably 20-30min.

[0043] In the present invention, the stirring rate at room temperature is preferably 200-1000 rpm, more preferably 300-800 rpm; the time is preferably 2-6 hours, more preferably 3-5 hours. In the present invention, during the stirring at room temperature, the paraffin forms a stable emulsion under the action of the emulsifier.

[0044] Based on the mass fraction of the paraffin emulsion, the self-controlling temperature electric heating anti-icing coating provided by the present invention includes 2 to 25 parts of conductive filler, preferably 2 to 15 parts; as a specific embodiment of the present invention, the amount of the conductive filler can be 2 parts, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts or 25 parts.

[0045] In the present invention, the conductive filler preferably includes one or more of graphene, graphite fiber, conductive carbon black and carbon nanotubes. In the present invention, the sheet diameter of the graphene is preferably 20-30 μm, and the thickness is preferably 1-5 nm; the length of the graphite fiber is preferably 5-10 mm, and the diameter is preferably 4-10 μm; the particle size of the conductive carbon black is preferably 20-80 nm; the length of the carbon nanotube is preferably 5-30 μm, and the diameter is preferably 10-30 nm. In the present invention, the role of the conductive filler is to form a complete conductive network.

[0046] Based on the mass fraction of the paraffin emulsion, the self-controlling temperature electric heating anti-icing coating provided by the present invention includes 4 to 40 parts of water-based resin, preferably 4 to 20 parts. As a specific embodiment of the present invention, the amount of the water-based resin can be 4 parts, 8 parts, 12 parts, 16 parts, 20 parts, 24 parts, 28 parts, 32 parts, 36 parts or 40 parts.

[0047] In the present invention, the water-based resin preferably includes one or more of a water-based acrylic resin, a water-based fluorine-modified acrylate resin, a water-based silicon-modified acrylate resin and a water-based epoxy resin.

[0048] As a specific embodiment of the present invention, the model of the water-based acrylic resin is JT-207A, purchased from Foshan Juntu New Materials Co., Ltd.; the water-based fluorine-modified acrylate resin is purchased from Anhui Zhongen Chemical Co., Ltd., the model of the water-based silicon-modified acrylate resin is JT-213, purchased from Foshan Juntu New Materials Co., Ltd., and the model of the water-based epoxy resin is F0707, purchased from Shenzhen Yoshida Chemical Co., Ltd.

[0049] In the present invention, the method for preparing the self-controlled temperature electrically heated anti-icing coating preferably comprises the following steps:

[0050] The paraffin wax emulsion, the conductive filler and the water-based resin are mixed to obtain a self-controlling temperature electric heating anti-icing coating.

[0051] The present invention has no special requirements for the mixing method, and any mixing method known in the art can be used.

[0052] The present invention provides the application of the self-temperature-controlled electrically heated anti-icing coating in the field of anti-icing and de-icing.

[0053] The present invention provides a self-controlled temperature electric heating anti-icing coating, which is obtained by curing the above self-controlled temperature electric heating anti-icing coating. In the present invention, the curing temperature is preferably room temperature, and the curing time is preferably 6 to 24 hours; as a specific embodiment of the present invention, the curing time can be 6, 12, 18 or 24 hours.

[0054] In the present invention, the method for preparing the self-temperature-controlled electrically heated anti-icing coating preferably comprises the following steps:

[0055] The self-controlling temperature electrically heated anti-icing coating is coated on the surface of a substrate and cured to obtain a self-controlling temperature electrically heated anti-icing coating.

[0056] In the present invention, the coating method is preferably one of drip coating, spray coating, dipping coating, and brush coating. The present invention has no special requirements for the specific operation method of the coating, and a coating method familiar to those skilled in the art can be used.

[0057] In the present invention, the thickness of the self-temperature-controlled electrically heated anti-icing coating is preferably 50 to 80 μm, and more preferably 60 to 70 μm.

[0058] The self-controlled temperature electric heating anti-icing paint and coating thereof provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be understood as limiting the protection scope of the present invention.

[0059] Example 1

[0060] (1) Preparation of paraffin emulsion

[0061] A mixed solution of 20 g of molten paraffin and 1 g of vinyltrimethoxysilane was added to an aqueous solution of 1 g of hydroxypropyl methylcellulose (1 g) (the mass ratio of hydroxypropyl methylcellulose to water was 1:200), and emulsified at 80°C for 30 min at a speed of 20,000 rpm to form an emulsion; the emulsion was stirred and reacted at room temperature for 5 h, and cooled to room temperature to obtain a paraffin emulsion.

[0062] The optical microscope image of the obtained paraffin emulsion is as follows: Figure 1 As shown. Figure 1 It can be seen that the particle size of paraffin wax is approximately 10 μm.

[0063] (2) Preparation of self-controlled temperature electric heating anti-icing coating

[0064] The paraffin emulsion, carbon nanotubes (length 5-30 μm, diameter 10-30 nm) and water-based epoxy resin (F0707, purchased from Shenzhen Yoshida Chemical Co., Ltd.) were mixed in a mass ratio of 1:2:4 to obtain a self-controlled temperature electric heating anti-icing coating.

[0065] The self-controlled temperature electric heating anti-icing coating is coated on the substrate and cured at room temperature for 24 hours to obtain a self-controlled temperature electric heating anti-icing coating with a thickness of 50 to 80 μm.

[0066] Performance Testing

[0067] The self-controlled electric heating anti-icing coating obtained in Example 1 was precooled in a -30°C refrigerator for 10 min, 0.1 mL of deionized water was dripped on the coating surface using a dropper, and after freezing for 20 min, a 64 V voltage was applied to heat the coating, and the process of ice shedding and the temperature of the coating surface were captured. Figure 2 .Depend on Figure 2 It can be seen that the ice starts to slide off after 3.2 minutes of electric heating, and the ice completely slides off the coating surface after 3.3 minutes, at which time the temperature of the coating surface can reach 9.8° C. Therefore, the self-controlled temperature electric heating anti-deicing coating provided by the present invention can realize electric heating deicing under cold load.

[0068] Embodiments 2 to 4

[0069] The difference between Examples 2 to 4 and Example 1 is that the amount of paraffin emulsion in the self-controlled temperature electric heating anti-icing coating is different, the components of the conductive filler and the water-based resin are different, and the other operations are the same. The amount of each component in Examples 2 to 4 is shown in Table 1.

[0070] Comparative Examples 1-2

[0071] The difference between Comparative Examples 1 to 2 and Example 1 is that the amounts of paraffin emulsion, carbon nanotubes and water-based resin in the self-temperature-controlled electric heating coating are different, and the other operations are the same.

[0072] The self-controlled temperature electric heating anti-icing coatings obtained in Examples 2 to 4 and Comparative Examples 1 to 2 were tested for electric heating deicing under cold load, and the results are shown in Table 1.

[0073] Table 1 Types, proportions and properties of raw materials of Examples 2 to 4 and Comparative Examples 1 to 2

[0074]

[0075] Figure 3The surface resistivity of the self-controlled electric heating anti-icing coating prepared in Example 1 varies with temperature. As the surface temperature of the coating increases, the surface resistivity of the coating increases sharply. When the temperature is higher, the surface resistivity increases slowly and tends to be stable at 80°C. Therefore, the coating has a positive temperature coefficient effect, which can avoid overheating and ablation of the coating surface when a high voltage is applied.

[0076] Figure 4 This is the electric heating cycle of the self-controlling electric heating anti-icing coating prepared in Example 1 when a voltage of 64V is applied. After 8 cycles, the surface temperature of the coating remains constant, indicating that the coating has good electric heating cycle stability and can be reused many times.

[0077] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A self-controlled temperature electric heating anti-icing coating, characterized in that: Including the following raw materials by mass: 1-32 parts of paraffin emulsion; 2 to 25 parts of conductive filler; 4-40 parts of water-based resin; The solid content of the paraffin emulsion is 8-15%; the raw materials for preparing the paraffin emulsion include paraffin, silane coupling agent, emulsifier and water.

2. The self-controlled temperature electric heating anti-icing coating according to claim 1 is characterized in that: The preparation method of the paraffin emulsion comprises the following steps: Paraffin wax, silane coupling agent, emulsifier and water are mixed, and heated for emulsification and stirred at room temperature in sequence to obtain a paraffin wax emulsion.

3. The self-controlled temperature electric heating anti-icing coating according to claim 2 is characterized in that: The mass ratio of the paraffin wax to the silane coupling agent and the emulsifier is (15-40):(2-8):(1-6).

4. The self-controlled temperature electric heating anti-icing coating according to claim 2 or 3, characterized in that: The silane coupling agent includes one or more of vinyl trimethoxy silane, vinyl tri (β-methoxyethoxy) silane and γ-glycidyl ether oxypropyl trimethoxy silane; The emulsifier includes one or more of cetyltrimethylammonium bromide, hydroxypropyl methylcellulose, sodium lauryl sulfate, OP-10, polyvinyl alcohol and Span 80.

5. The self-controlled temperature electric heating anti-icing coating according to claim 2 is characterized in that: The heating emulsification temperature is 60-100°C, the speed is 10000-20000rpm, and the time is 10-40min; The stirring rate at room temperature is 200-1000 rpm, and the time is 2-6 hours.

6. The self-controlled temperature electric heating anti-icing coating according to claim 1, characterized in that: The conductive filler includes one or more of graphene, graphite fiber, conductive carbon black and carbon nanotubes.

7. The self-controlled temperature electric heating anti-icing coating according to claim 1 or 6, characterized in that: The water-based resin includes one or more of water-based acrylic resin, water-based fluorine-modified acrylate resin, water-based silicon-modified acrylate resin and water-based epoxy resin.

8. Application of the self-temperature-controlled electrically heated anti-icing coating according to any one of claims 1 to 7 in the field of anti-icing and de-icing.

9. A self-controlled temperature electric heating anti-icing coating, characterized in that: The self-temperature-controlled electric heating anti-icing coating is obtained by curing the self-temperature-controlled electric heating anti-icing coating as described in any one of claims 1 to 7.

10. The self-controlled temperature electric heating anti-icing coating according to claim 9, characterized in that: The curing temperature is room temperature and the curing time is 6 to 24 hours.

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