Fluorine-free anti-icing coating as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of coatings, and particularly relates to a fluoride-free anti-icing coating and a preparation method and application thereof.The coating comprises a component A and a component B, and the mass ratio of the component A to the component B is 100: 16.3-19.5; wherein the component A comprises the following components in parts by weight: 60-65 parts of modified acrylic resin; 1-1.5 parts of a low surface energy additive; 8 to 10 parts of nano silicon dioxide; 3-5 parts of a lubricating filler; 0.3 to 0.5 part of a dispersant; 0.5 to 1.5 parts of an adhesion promoter; 16.5 to 27.2 parts of a compound solvent; and the component B is aliphatic polyisocyanate resin. The anti-icing coating has a low surface energy hydrophobic effect and a dynamic lubricating effect, and has excellent anti-icing performance under the synergistic effect of the low surface energy hydrophobic effect and the dynamic lubricating effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of coatings, and in particular relates to a fluorine-free anti-icing coating and a preparation method and application thereof. Background Art

[0002] In winter or in areas with extremely cold climates, many important areas related to national security, such as power transmission, communication networks, aviation, navigation, and high-speed rail transportation, will experience varying degrees of icing, posing a major threat to the national economic operation. To address this issue, there are currently two commonly used strategies at home and abroad: one is active methods, such as using thermal, electrical, and mechanical methods to remove ice; the other is passive methods, such as using anti-icing coatings to protect exposed surfaces and reduce the adhesion of ice on the surface. Among them, active methods are being widely used, but at the cost of a large amount of energy consumption. Passive anti-icing mainly involves constructing an anti-icing functional coating on the surface of the substrate to reduce the adhesion of ice to the substrate surface and the amount of ice covering it. This method has the characteristics of low cost, low energy consumption, and ease of implementation, making it an ideal anti-icing method.

[0003] A key issue in anti-icing coating material research is reducing or eliminating ice adhesion on the coating surface, thereby minimizing ice buildup. This can be achieved by primarily considering the chemical composition of the coating surface and its surface roughness and microstructure.

[0004] (1) Construction of hydrophobic / superhydrophobic surfaces

[0005] The mechanism by which superhydrophobic surfaces resist freezing is that the microstructure of the surface results in a relatively high energy barrier for water droplets to nucleate on the surface, making it difficult for them to nucleate and freeze. Furthermore, the surface's large contact angle reduces the spherical shape of water droplets, minimizing the contact area between the droplet and the condensing surface. This reduces the rate of cold transfer from the condensing surface to the droplet and delays its freezing. Furthermore, the hysteresis and rolling angles of water droplets on the surface are small, allowing them to slide off easily, keeping the surface dry and achieving the desired anti-icing effect.

[0006] (2) Surface morphology modification

[0007] Surface roughness is also a key factor in determining ice adhesion strength. A suitable surface microstructure and a certain degree of roughness not only enhance the surface's hydrophobicity and delay the formation of ice crystals, but also trap air, causing stress concentration at the ice / substrate interface, leading to crack formation and expansion, and consequently reducing ice adhesion strength.

[0008] Publication number CN 112625516 A, entitled "Highly Weather-Resistant Self-Cleaning Anti-Icing Coating and Its Preparation Method," discloses a two-component self-cleaning coating made from a fluorocarbon resin, a modified PDMS polymer, additives, and an organic solvent. The coating exhibits excellent hydrophobicity and weather resistance, but its adhesion to ice surfaces was not examined. Publication number CN 101798366 A, entitled "Water-Based Perfluoroalkyl Fluorocarbon Emulsion and Water-Based Cable Anti-Icing Coating Containing the Emulsion and Its Preparation Method," discloses a water-based cable anti-icing coating containing a perfluoroalkyl fluorocarbon emulsion. The coating is composed of a self-made water-based fluorocarbon emulsion, an emulsifier, and a colorant. The cured product exhibits low surface energy and excellent mechanical properties, but the emulsion preparation process is complex, making it difficult to manufacture. In addition, the products of the above two patents contain a large amount of fluorine-containing organic matter. Studies have shown that the interaction force between H atoms and F atoms in fluorine-containing materials is about three times the interaction force between -CH3 and Si-O. Water often has a very large rolling angle on the surface of fluorine-containing materials, resulting in the fluorine-containing coating having a high adhesion strength. In actual application, the adhesion strength of the ice layer is often large, and it is difficult to fall off naturally under the action of external force. Fluorine-containing organic matter is difficult to degrade, which poses a great threat to construction workers and the environment.

[0009] In view of this, the present invention is proposed. Summary of the Invention

[0010] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and propose a fluorine-free anti-icing coating and its preparation method and application, which solves the problems of existing anti-icing coatings such as complex components, strong adhesion to the ice layer, high fluorine compound content, and complex preparation process.

[0011] In order to achieve the above object, the present invention adopts the following technical solutions:

[0012] In one aspect, the present invention provides a fluorine-free anti-icing coating comprising component A and component B, wherein the mass ratio of component A to component B is 100:16.3-19.5;

[0013] The component A comprises the following components in parts by weight: 60-65 parts of modified acrylic resin; 1-1.5 parts of low surface energy additive; 8-10 parts of nano-silicon dioxide; 3-5 parts of lubricating filler; 0.3-0.5 parts of dispersant; 0.5-1.5 parts of adhesion promoter; and 16.5-27.2 parts of compounding solvent.

[0014] The component B is an aliphatic polyisocyanate resin.

[0015] Furthermore, the modified acrylic resin is JZ-9522, JZ-9545 or JZ-9513 silicone-modified hydroxy acrylic resin.

[0016] The low-surface-energy additive is PMX-200 polydimethylsiloxane, the nano-silica is DM-20s, R972, or R812S fumed silica, the lubricating filler is MoS2 powder or polytetrafluoroethylene powder, and the particle size of the lubricating filler powder is less than 500 nm. Furthermore, the dispersant is BYK110, BYK9076, or BYK-P104S, and the adhesion promoter is KH560 silane coupling agent.

[0017] Furthermore, the aliphatic polyisocyanate resin is N3390, HI100 or N75 aliphatic polyisocyanate.

[0018] Furthermore, the compound solvent consists of xylene and butyl acetate, and the mass ratio of xylene to butyl acetate is 8:2.

[0019] On the other hand, the present invention provides a method for preparing a fluorine-free anti-icing coating, based on the fluorine-free anti-icing coating as described above, comprising the following steps:

[0020] Step 1, weighing raw materials: weighing modified acrylic resin, low surface energy additive, nano-silica, lubricating filler, dispersant, adhesion promoter, compounding solvent and aliphatic polyisocyanate resin according to the set weight parts;

[0021] Step 2, preparing a nano-dispersion liquid: adding nano-silica, a lubricating filler, and a low surface energy additive to the compound solvent weighed in step 1 in sequence, stirring pre-dispersed at a low speed, and then adding a dispersant and ultrasonically dispersing uniformly to obtain a nano-dispersion liquid;

[0022] Step 3, preparing component A: sequentially adding the adhesion promoter weighed in step 1 and the nano-dispersion prepared in step 2 to the modified acrylic resin, and then stirring and dispersing them uniformly to obtain component A;

[0023] Step 4, preparing an anti-icing coating: uniformly mixing component A prepared in step 3 with an aliphatic polyisocyanate resin to obtain an anti-icing coating.

[0024] Furthermore, in step 2, the mixture is pre-dispersed at a low speed of 300-500 r / min for 20-30 minutes, and then ultrasonically dispersed at a frequency of 80-100 kHz for 15-20 minutes to obtain a uniformly dispersed nano-dispersion liquid.

[0025] Furthermore, in step 3, the mixture is dispersed at a rotation speed of 2000 to 2200 r / min for 20 to 30 minutes to obtain a uniformly dispersed component A.

[0026] On the other hand, the present invention provides an application of a fluorine-free anti-icing coating. Based on the preparation method described above, the fluorine-free anti-icing coating prepared therefrom is applied to the fields of energy, electricity, etc.

[0027] Specifically, if applied to transmission lines and power grid facilities, it can effectively reduce the amount of ice covering cables and insulators, thereby reducing the risk of line breakage; or if applied to wind turbine blades, the amount of ice covering can be reduced after coating, which can extend the life of the blades and ensure the stability of power generation.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The anti-icing coating of the present invention is a two-component anti-icing coating with a skeleton of organosilicon-modified hydroxyl acrylic resin and aliphatic polyisocyanate crosslinked product, and nanoparticles and functional additives added to form the system. There are no fluorine compounds in the system. The anti-icing performance of the anti-icing coating of the present invention is achieved based on the synergistic effect of low surface energy hydrophobic effect and dynamic lubrication. Specifically, the low surface energy organosilicon-modified acrylic resin and micro-nano structure (vapor-phase silica) form a super-hydrophobic surface, which reduces the water-solid contact area and delays the freezing time; low surface energy additives such as polydimethylsiloxane and lubricating fillers form a lubricated interface at low temperatures, reducing the mechanical interlocking effect between ice and the coating, making the ice layer easy to fall off.

[0030] 2. The anti-icing coating of the present invention has excellent hydrophobicity, a contact angle greater than 150°, extremely low adhesion strength to the ice surface, and a significant anti-icing effect. Specifically, (1) the Si-O-Si bond in the film-forming modified acrylic resin forms a hydrophobic barrier, reducing the adsorption of water molecules, and the acrylate main chain enhances the stability of the coating through the IPN (interpenetrating network) structure; (2) the nano-silica forms a porous network structure through particle size regulation, trapping air to form a Cassie-Baxter state, reducing the actual contact area between ice and the substrate; (3) the low surface energy additive molecular chain maintains flexibility at low temperatures, forms a lubricating interface through surface migration, and the ice layer is easily peeled off under external force. Its self-healing properties can repair mechanical damage; (4) the layered structure of the lubricating filler MoS2 (weak van der Waals force between layers) forms a sliding surface in the coating, and the ice layer is easily peeled off under shear force; (5) the dispersant stabilizes the nano-fillers (silica, MoS2) through steric hindrance, uniformly dispersing them, preventing agglomeration and maintaining the integrity of the micro-nanostructure.

[0031] 3. The anti-icing coating of the present invention has good weather resistance, strong adhesion to substrates, and excellent mechanical properties, allowing for long-term outdoor use. Specifically, (1) the film-forming modified acrylic resin provides good weather resistance, flexibility, and adhesion after curing; (2) the lubricating filler MoS2 reduces the friction coefficient and has stable chemical properties, allowing for long-term stability; and (3) the silane groups in the adhesion promoter form chemical bonds with the substrate after hydrolysis, enhancing the interfacial bonding between the coating and the substrate.

[0032] 4. The preparation method of the fluorine-free anti-icing coating of the present invention is simple to operate and takes a short preparation time. The prepared fluorine-free anti-icing coating has stable performance. Therefore, the preparation method improves production efficiency while ensuring the quality of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the invention.

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0035] Figure 1 The figure is a schematic flow chart of the preparation method of the fluorine-free anti-icing coating of the present invention. DETAILED DESCRIPTION

[0036] Here, exemplary embodiments will be described in detail, and the embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples consistent with some aspects of the present invention described in detail in the appended claims.

[0037] Example 1

[0038] On the one hand, this embodiment provides a fluorine-free anti-icing coating, comprising component A and component B, wherein the mass ratio of component A to component B is 100:18;

[0039] Wherein, the component A comprises the following components in parts by weight: 60 parts of modified acrylic resin; 1 part of low surface energy additive; 8 parts of nano-silicon dioxide; 3 parts of lubricating filler; 0.3 parts of dispersant; 0.5 parts of adhesion promoter; 27.2 parts of compounding solvent;

[0040] The component B is an aliphatic polyisocyanate resin in an amount of 18 parts by weight.

[0041] Furthermore, the modified acrylic resin is JZ-9522 silicone-modified hydroxy acrylic resin, which has a hydroxyl value of 152±5 mgKOH / g and is a colorless to slightly yellow fluid at room temperature, and is sourced from Anhui Jiazhixinnuo Chemical Co., Ltd.

[0042] Furthermore, the low surface energy additive model is PMX-200, the main component of which is polydimethylsiloxane, which is a colorless fluid at room temperature and is sourced from Dow Corning Corporation of the United States.

[0043] Furthermore, the nano-silicon dioxide is of model DM-20s, is white powder at room temperature, and is sourced from Tokuyama Co., Ltd. of Japan.

[0044] Furthermore, the lubricating filler is MoS2 powder, the particle size of which is less than 500nm, and it is black powder at room temperature, and it comes from Luoyang Tongrun Nano Technology Co., Ltd.

[0045] Furthermore, the dispersant is BYK110, which is a colorless liquid at room temperature and is sourced from BYK Additives (Shanghai) Co., Ltd.

[0046] Furthermore, the adhesion promoter is KH560 silane coupling agent, the main component of which is γ-glycidyloxypropyltrimethoxysilane, which is a colorless and transparent liquid at room temperature and comes from Hangzhou Jessica Chemical Co., Ltd.

[0047] Furthermore, the compound solvent consists of xylene and butyl acetate, and the mass ratio of xylene to butyl acetate is 8:2. Both are products of Tianjin Kemao Chemical Reagent Co., Ltd. with a purity of ≥99.5%.

[0048] Furthermore, the component B is N3390 aliphatic polyisocyanate, which is a colorless to light yellow transparent liquid at room temperature and has an NCO content of 19.6±0.3%, and is sourced from Covestro Polymers (China) Co., Ltd.

[0049] On the other hand, this embodiment provides a method for preparing a fluorine-free anti-icing coating, based on the fluorine-free anti-icing coating described above, comprising the following steps:

[0050] Step 1, weighing raw materials: weighing JZ-9522 silicone-modified hydroxy acrylic resin, PMX-200 polydimethylsiloxane, DM-20s fumed silica, MoS2 powder, BYK110 dispersant, KH560 silane coupling agent, xylene and butyl acetate in a mass ratio of 8:2, and N3390 aliphatic polyisocyanate according to the weight parts as described above;

[0051] Step 2, preparing a nano-dispersion liquid: adding DM-20s fumed silica, MoS2 powder, and PMX-200 polydimethylsiloxane to the compound solvent weighed in step 1 in sequence, pre-dispersing at a speed of 300 r / min for 30 minutes, then adding BYK110 dispersant and ultrasonically dispersing at a frequency of 100 kHz for 15 minutes to obtain a nano-dispersion liquid;

[0052] Step 3, preparing component A: sequentially adding the KH560 silane coupling agent weighed in step 1 and the nano-dispersion prepared in step 2 to the JZ-9522 organosilicon-modified hydroxy acrylic resin, dispersing at a speed of 2100 r / min for 20 minutes, and mixing uniformly to obtain component A;

[0053] When in use, component A is mixed evenly with N3390 aliphatic polyisocyanate to obtain an anti-icing coating.

[0054] On the other hand, the present embodiment provides an application of a fluorine-free anti-icing coating, and the fluorine-free anti-icing coating prepared by the preparation method of the present embodiment is applied in the fields of energy and electricity.

[0055] Example 2

[0056] On the one hand, this embodiment provides a fluorine-free anti-icing coating, comprising component A and component B, wherein the mass ratio of component A to component B is 100:18;

[0057] Component A comprises the following components in parts by weight: 60 parts of JZ-9522 silicone-modified hydroxy acrylic resin; 1.5 parts of PMX-200 polydimethylsiloxane; 9 parts of DM-20s fumed silica; 3 parts of MoS2 powder; 0.3 parts of BYK110 dispersant; 0.5 parts of KH560 silane coupling agent; and 25.7 parts of xylene and butyl acetate in a mass ratio of 8:2.

[0058] The component B is an aliphatic polyisocyanate resin in an amount of 18 parts by weight.

[0059] On the other hand, this embodiment provides a method for preparing a fluorine-free anti-icing coating, based on the fluorine-free anti-icing coating described above, comprising the following steps:

[0060] Step 1. Weighing raw materials: weigh JZ-9522 silicone-modified hydroxy acrylic resin, PMX-200 polydimethylsiloxane, DM-20s fumed silica, MoS2 powder, BYK110 dispersant, KH560 silane coupling agent, xylene and butyl acetate in a mass ratio of 8:2, and N3390 aliphatic polyisocyanate according to the set weight parts;

[0061] Step 2, preparing a nano-dispersion liquid: DM-20s fumed silica, MoS2 powder, and PMX-200 polydimethylsiloxane were added to the compound solvent weighed in step 1 in sequence, pre-dispersed at a speed of 300 r / min for 20 minutes, and then BYK110 dispersant was added and ultrasonically dispersed at a frequency of 100 kHz for 15 minutes to obtain a nano-dispersion liquid;

[0062] Step 3, preparing component A: sequentially adding the KH560 silane coupling agent weighed in step 1 and the nano-dispersion prepared in step 2 to the JZ-9522 organosilicon-modified hydroxy acrylic resin, dispersing at a speed of 2000 r / min for 20 minutes, and mixing uniformly to obtain component A;

[0063] When in use, component A is mixed evenly with N3390 aliphatic polyisocyanate to obtain an anti-icing coating.

[0064] Example 3

[0065] On the one hand, this embodiment provides a fluorine-free anti-icing coating, comprising component A and component B, wherein the mass ratio of component A to component B is 100:16.3;

[0066] Component A comprises the following components in parts by weight: 63 parts of JZ-9545 silicone-modified hydroxy acrylic resin; 1.3 parts of PMX-200 polydimethylsiloxane; 8 parts of R972 fumed silica; 4 parts of polytetrafluoroethylene powder; 0.4 parts of BYK9076; 1 part of KH560 silane coupling agent; and 22.3 parts of xylene and butyl acetate in a mass ratio of 8:2.

[0067] The weight portion of the component B, which is an aliphatic polyisocyanate resin, is 16.3 parts.

[0068] On the other hand, this embodiment provides a method for preparing a fluorine-free anti-icing coating, based on the fluorine-free anti-icing coating described above, comprising the following steps:

[0069] Step 1, weighing raw materials: weighing JZ-9545 silicone modified hydroxy acrylic resin, PMX-200 polydimethylsiloxane, R972 fumed silica, polytetrafluoroethylene powder, BYK9076, KH560 silane coupling agent, xylene and butyl acetate in a mass ratio of 8:2, and HI100 aliphatic polyisocyanate according to the set weight parts;

[0070] Step 2, preparing a nano-dispersion: adding R972 fumed silica, polytetrafluoroethylene powder, and PMX-200 polydimethylsiloxane to the composite solvent (xylene and butyl acetate in a mass ratio of 8:2) weighed in step 1, pre-dispersing at a speed of 400 r / min for 30 minutes, then adding BYK9076 dispersant and ultrasonically dispersing at a frequency of 80 kHz for 20 minutes to obtain a nano-dispersion;

[0071] Step 3, preparing component A: sequentially adding the KH560 silane coupling agent weighed in step 1 and the nano-dispersion prepared in step 2 to the JZ-9545 organosilicon-modified hydroxy acrylic resin, dispersing at a speed of 2100 r / min for 25 minutes, and mixing uniformly to obtain component A;

[0072] When in use, component A is mixed evenly with HI100 aliphatic polyisocyanate to obtain an anti-icing coating.

[0073] Example 4

[0074] On the one hand, this embodiment provides a fluorine-free anti-icing coating, comprising component A and component B, wherein the mass ratio of component A to component B is 100:17.7;

[0075] Component A comprises the following components in parts by weight: 65 parts of JZ-9513 organosilicon-modified hydroxy acrylic resin; 1 part of PMX-200 polydimethylsiloxane; 9 parts of R812S fumed silica; 4.5 parts of MoS2 powder; 0.4 parts of BYK-P104S; 1 part of KH560 silane coupling agent; and 19.1 parts of xylene and butyl acetate in a mass ratio of 8:2.

[0076] The weight portion of the component B, which is an aliphatic polyisocyanate resin, is 17.7 parts.

[0077] On the other hand, this embodiment provides a method for preparing a fluorine-free anti-icing coating, based on the fluorine-free anti-icing coating described above, comprising the following steps:

[0078] Step 1. Weighing raw materials: Weigh JZ-9513 silicone-modified hydroxy acrylic resin, PMX-200 polydimethylsiloxane, R812S fumed silica, MoS2 powder, BYK-P104S, KH560 silane coupling agent, xylene and butyl acetate in a mass ratio of 8:2, and N3390 aliphatic polyisocyanate according to the set weight parts;

[0079] Step 2, preparing a nano-dispersion liquid: adding R812S fumed silica, MoS2 powder, and PMX-200 polydimethylsiloxane to the compound solvent weighed in step 1 in sequence, pre-dispersing at a speed of 500 r / min for 20 minutes, then adding BYK-P104S dispersant and ultrasonically dispersing at a frequency of 90 kHz for 18 minutes to obtain a nano-dispersion liquid;

[0080] Step 3, preparing component A: sequentially adding the KH560 silane coupling agent weighed in step 1 and the nano-dispersion prepared in step 2 to the JZ-9513 organosilicon-modified hydroxy acrylic resin, dispersing at a speed of 2000 r / min for 25 minutes, and mixing uniformly to obtain component A;

[0081] When in use, component A is mixed evenly with N75 aliphatic polyisocyanate to obtain an anti-icing coating.

[0082] Example 5

[0083] On the one hand, this embodiment provides a fluorine-free anti-icing coating, comprising component A and component B, wherein the mass ratio of component A to component B is 100:19.5;

[0084] Component A comprises the following components in parts by weight: 65 parts of JZ-9522 silicone-modified hydroxy acrylic resin; 1.5 parts of PMX-200 polydimethylsiloxane; 10 parts of DM-20s fumed silica; 5 parts of MoS2 powder; 0.5 parts of BYK110 dispersant; 1.5 parts of KH560 silane coupling agent; and 16.5 parts of xylene and butyl acetate in a mass ratio of 8:2.

[0085] The weight portion of the component B, which is an aliphatic polyisocyanate resin, is 19.5 parts.

[0086] On the other hand, this embodiment provides a method for preparing a fluorine-free anti-icing coating, based on the fluorine-free anti-icing coating described above, comprising the following steps:

[0087] Step 1. Weighing raw materials: weigh JZ-9522 silicone-modified hydroxy acrylic resin, PMX-200 polydimethylsiloxane, DM-20s fumed silica, MoS2 powder, BYK110 dispersant, KH560 silane coupling agent, xylene and butyl acetate in a mass ratio of 8:2, and N3390 aliphatic polyisocyanate according to the set weight parts;

[0088] Step 2: Add DM-20s fumed silica, MoS2 powder, and PMX-200 polydimethylsiloxane to the composite solvent weighed in step 1, pre-disperse at a speed of 500 r / min for 30 minutes, then add BYK110 dispersant and ultrasonically disperse at a frequency of 100 kHz for 15 minutes to obtain a nano-dispersion liquid;

[0089] Step 3, preparing component A: sequentially adding the KH560 silane coupling agent weighed in step 1 and the nano-dispersion prepared in step 2 to the JZ-9522 organosilicon-modified hydroxy acrylic resin, dispersing at a speed of 2200 r / min for 30 minutes, and mixing uniformly to obtain component A;

[0090] When in use, component A is mixed evenly with N3390 aliphatic polyisocyanate to obtain an anti-icing coating.

[0091] To verify the performance of the anti-icing coatings prepared in Examples 1-5, the anti-icing coatings prepared in Examples 1-5 were sprayed onto substrate surfaces using an air spray method to form anti-icing coatings. The adhesion of each coating to the substrate was tested using the crosshatch method according to GB / T9286-2021; the abrasion resistance of each coating was tested according to GB / T1768-2006; the water contact angle and rolling angle of each coating surface were tested according to ISO19403; the ice shear strength of each coating surface was tested according to GB / T7124-2008; and the resistance to artificial weathering of each coating was tested according to GB / T14522-2008. Specifically, the spraying process parameters for each example are shown in Table 1, and the performance test results are described in Table 2.

[0092] Table 1 Spraying process parameters of Examples 1 to 5

[0093] Craftsmanship Example 1 Example 2 Example 3 Example 4 Example 5 Spraying thickness, μm 80 80 80 100 100 Drying time, h 48 48 48 48 48 Spray gun caliber, mm 1.2 1.2 1.2 1.2 1.2 Spraying distance, cm 15 15 18 18 20 Gun speed, cm / s 40 40 35 30 30 Spraying air pressure, MPa 0.6 0.6 0.6 0.6 0.6

[0094] Table 2 Performance test results

[0095]

[0096]

[0097] It can be seen from the test results in Table 2 that the anti-icing coating prepared by the present invention has excellent hydrophobic properties, a water contact angle of >150°, obvious advantages in wear resistance and adhesion, low ice layer shear strength on the coating surface, ice layer shear adhesion strength <30KPa, and good weather resistance.

[0098] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0099] It should be understood that the present invention is not limited to the above description and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A fluorine-free anti-icing coating, characterized in that: Comprising component A and component B, wherein the mass ratio of component A to component B is 100:16.3-19.5; The component A comprises the following components in parts by weight: 60-65 parts of modified acrylic resin; 1-1.5 parts of low surface energy additive; 8-10 parts of nano-silicon dioxide; 3-5 parts of lubricating filler; 0.3-0.5 parts of dispersant; 0.5-1.5 parts of adhesion promoter; and 16.5-27.2 parts of compounding solvent. The component B is an aliphatic polyisocyanate resin.

2. The fluorine-free anti-icing coating according to claim 1, characterized in that: The modified acrylic resin is JZ-9522, JZ-9545 or JZ-9513 silicone-modified hydroxy acrylic resin.

3. The fluorine-free anti-icing coating according to claim 1, characterized in that: The low surface energy additive is PMX-200 polydimethylsiloxane, the nano-silica is DM-20s, R972 or R812S fumed silica; the lubricating filler is MoS2 powder or polytetrafluoroethylene powder, and the particle size of the lubricating filler is less than 500nm.

4. The fluorine-free anti-icing coating according to claim 1, characterized in that: The dispersant is BYK110, BYK9076 or BYK-P104S; and the adhesion promoter is KH560 silane coupling agent.

5. The fluorine-free anti-icing coating according to claim 1, characterized in that: The aliphatic polyisocyanate resin is N3390, HI100 or N75 aliphatic polyisocyanate.

6. The fluorine-free anti-icing coating according to claim 1, characterized in that: The compound solvent consists of xylene and butyl acetate, and the mass ratio of the xylene to butyl acetate is 8:

2.

7. A method for preparing a fluorine-free anti-icing coating, characterized in that: The fluorine-free anti-icing coating according to any one of claims 1 to 6 comprises the following steps: Step 1, weighing raw materials: weighing modified acrylic resin, low surface energy additive, nano-silica, lubricating filler, dispersant, adhesion promoter, compounding solvent and aliphatic polyisocyanate resin according to the set weight parts; Step 2, preparing a nano-dispersion liquid: adding nano-silica, a lubricating filler, and a low surface energy additive to the compound solvent weighed in step 1 in sequence, stirring pre-dispersed at a low speed, and then adding a dispersant and ultrasonically dispersing uniformly to obtain a nano-dispersion liquid; Step 3, preparing component A: sequentially adding the adhesion promoter weighed in step 1 and the nano-dispersion prepared in step 2 to the modified acrylic resin, and then stirring and dispersing them uniformly to obtain component A; Step 4, preparing an anti-icing coating: uniformly mixing component A prepared in step 3 with an aliphatic polyisocyanate resin to obtain an anti-icing coating.

8. The preparation method according to claim 7, characterized in that In step 2, pre-dispersion is performed at a low speed of 300-500 r / min for 20-30 minutes, and then ultrasonic dispersion is performed at a frequency of 80-100 kHz for 15-20 minutes to obtain a uniformly dispersed nano-dispersion liquid.

9. The preparation method according to claim 7, characterized in that In step 3, the mixture is dispersed at a rotation speed of 2000 to 2200 r / min for 20 to 30 minutes to obtain a uniformly dispersed component A.

10. An application of a fluorine-free anti-icing coating, characterized in that: Based on the preparation method according to any one of claims 7 to 9, the fluorine-free anti-icing coating prepared therefrom is applied to the energy and electric power fields.

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