阅读说明：本技术 一种疏水镀层及包含该疏水镀层的空调接水盘 (Hydrophobic coating and air conditioner water pan comprising same ) 是由 温博 李云蹊 于 2020-05-25 设计创作，主要内容包括：本发明提出一种疏水镀层及包含该镀层的空调接水盘。能够解决现有空调接水盘无法实现自清洁和防霉的技术问题。该疏水镀层以质量百分比计,包括疏水颗粒1-30、纯金属或合金70-99,其中所述疏水颗粒选自石墨、硅酮粉、疏水二氧化硅、聚四氟乙烯、氟化石墨和经阳离子表面活性剂处理的石墨、硅酮粉、疏水二氧化硅、聚四氟乙烯、氟化石墨中的至少一种,所述纯金属或合金选自Ni、Cu和Co中的至少一种。本发明提供的疏水镀层能够应用于空调接水盘的疏水镀层制备中,可在保证镀层基础性能的基础下,大幅提升镀层的自清洁能力。(The invention provides a hydrophobic coating and an air-conditioning water pan comprising the same. Can solve the technical problem that the self-cleaning and mould-proof can not be realized by the water pan of the existing air conditioner. The hydrophobic coating comprises, by mass, 1-30 hydrophobic particles and 70-99 pure metals or alloys, wherein the hydrophobic particles are selected from at least one of graphite, silicone powder, hydrophobic silicon dioxide, polytetrafluoroethylene, graphite fluoride and graphite treated by a cationic surfactant, silicone powder, hydrophobic silicon dioxide, polytetrafluoroethylene and graphite fluoride, and the pure metals or alloys are selected from at least one of Ni, Cu and Co. The hydrophobic coating provided by the invention can be applied to preparation of the hydrophobic coating of the water pan of the air conditioner, and the self-cleaning capability of the coating can be greatly improved on the basis of ensuring the basic performance of the coating.)

1. The hydrophobic coating is characterized by comprising 1-30 mass percent of hydrophobic particles and 70-99 mass percent of pure metal or alloy.

2. The hydrophobic coating of claim 1, wherein the hydrophobic particles in the hydrophobic coating are 5-10 wt% and have a particle size of 0.1-10 μm.

3. The hydrophobic coating of claim 2, wherein the hydrophobic particles are selected from at least one of graphite, silicone powder, hydrophobic silica, polytetrafluoroethylene, graphite fluoride, and graphite treated with a cationic surfactant, silicone powder, hydrophobic silica, polytetrafluoroethylene, graphite fluoride, and wherein the pure metal or alloy is selected from at least one of Ni, Cu, and Co;

the cationic surfactant is selected from amine salt type, quaternary ammonium salt type, heterocyclic type or caltha salt type.

4. The method of preparing a hydrophobic coating as claimed in any one of claims 1 to 3, wherein the method of preparing comprises: the method comprises the steps of base material pretreatment and chemical plating, wherein the base material pretreatment comprises base material coarsening, base material sensitization, colloidal palladium activation and dispergation.

5. The preparation method according to claim 4, wherein the electroless plating step specifically comprises:

preparing water solution by using water as a solvent and using main salt, a reducing agent, a coordination agent, a buffering agent and an accelerating agent;

adding the hydrophobic particles, pure metal or alloy into the aqueous solution at the temperature of 40-100 ℃, adjusting the pH to 4-6, and uniformly stirring to obtain chemical plating solution;

and plating the chemical plating solution on the surface of the pretreated plastic base material, and curing and drying to obtain the hydrophobic plating layer.

6. The preparation method according to claim 5, wherein the mass concentration of the main salt in the aqueous solution is 15 to 35g/L, the mass concentration of the reducing agent is 25 to 40g/L, the mass concentration of the complexing agent is 10 to 40g/L, the mass concentration of the buffering agent is 10 to 20g/L, the mass concentration of the accelerating agent is less than 1g/L, and the mass concentration of the hydrophobic particles is 3 to 15 g/L.

7. The method of claim 6, wherein the primary salt is selected from NiSO₄·6H₂O、NiCl₂·6H₂O、CuSO₄·5H₂O、CuCl₂·2H₂At least one of O, cobalt sulfamate, cobalt chloride and cobalt sulfate;

the reducing agent is selected from at least one of sodium hypophosphite, dimethyl amino borane, hydrazine, potassium borohydride and formaldehyde, and sodium hypophosphite is preferred;

the complexing agent is selected from at least one of glycolic acid, citric acid, lactic acid, malic acid, propionic acid, salicylic acid, glycine, succinic acid, aminoacetic acid, EDTA, tartaric acid, ethylenediamine, ammonia, sodium cyanide and potassium hydrosulfide, preferably at least one of glycolic acid, citric acid, lactic acid, malic acid, propionic acid, salicylic acid, glycine, succinic acid, aminoacetic acid and tartaric acid;

the buffer is selected from at least one of monocarboxylic acid type, dicarboxylic acid type, hydroxycarboxylic acid type, boric acid, carbonic acid and sulfurous acid;

the accelerator is at least one selected from the group consisting of glycine, alanine, aminobutyric acid and aspartic acid.

8. The production method according to claim 6, wherein the electroless plating solution is applied for 10 to 40min, and the hydrophobic plating layer has a thickness of 0.02 to 15 μm.

9. The method according to claim 7, wherein the stirring means is mechanical stirring, air stirring, flat pump stirring or air circulation.

10. An air-conditioning water pan, characterized in that it comprises a hydrophobic coating according to any one of the preceding claims 1 to 3.

Technical Field

The invention relates to a hydrophobic coating, in particular to a hydrophobic coating capable of realizing double effects of self-cleaning, antibiosis and mildew prevention, and an air-conditioning water pan comprising the same.

Background

In the air conditioner assembly, the water receiving disc is used for receiving the condensed water falling from the heat exchanger and discharging the condensed water out of the air conditioner. The existing water pan in the trade can't in time discharge the air conditioner with the comdenstion water outside, very easily causes the accumulation of dust, leads to the enrichment of microorganism, and then influences living environment quality, harm health. If the air conditioner water receiving tray can have self-cleaning function, the problems of dust accumulation and microorganism enrichment can be solved, and the living environment can be guaranteed.

The patent application CN201710107943B provides a preparation method of a metal material surface super-hydrophobic film, wherein the hydrophobic film takes a metal matrix after impurity removal as a cathode, takes an inert electrode material, a pure nickel electrode or a lead-tin alloy electrode as an anode, and is obtained by modifying a coating by soaking in an ethanol solution of long-chain fatty acid for more than 2min to obtain a metal material surface super-hydrophobic coating; patent application CN109112589A discloses a method for preparing Co-TiO on metal surface₂The super-hydrophobic nano composite electroplated coating is prepared from metal cobalt salt, long-branched alkanoic acid and TiO₂Dissolving complexing agent and surfactant in ethanol overnight, stirring and ultrasonically vibrating uniformly to obtain the electroplating solution. The hydrophobic coating prepared by the scheme can be only applied to the metal surface. Therefore, no report about effective plating layers which can be used for the water-receiving plate of the air conditioner and simultaneously meet the effects of self-cleaning and mildew resistance exists at present.

Disclosure of Invention

Aiming at the technical problems that the air-conditioning water pan in the prior art cannot realize self-cleaning and further causes dust accumulation and microorganism enrichment, the invention provides a hydrophobic coating with self-cleaning and static electricity removing capabilities and an air-conditioning water pan comprising the same.

In order to achieve the purpose, the invention adopts the technical scheme that:

the hydrophobic coating comprises 1-30 mass percent of hydrophobic particles and 70-99 mass percent of pure metal or alloy.

Preferably, the hydrophobic particles in the hydrophobic coating are 5-10 mass percent, and the particle size of the hydrophobic particles is 0.1-10 μm.

Preferably, the hydrophobic particles are selected from at least one of graphite, silicone powder, hydrophobic silica, polytetrafluoroethylene, graphite fluoride and graphite treated by a cationic surfactant, silicone powder, hydrophobic silica, polytetrafluoroethylene and graphite fluoride, and the pure metal or alloy is selected from at least one of Ni, Cu and Co;

the cationic surfactant is selected from amine salt type, quaternary ammonium salt type, heterocyclic type or caltha salt type.

The invention provides a preparation method of a hydrophobic coating by using any one technical scheme, which comprises the following steps: the method comprises the steps of base material pretreatment and chemical plating, wherein the base material pretreatment comprises base material coarsening, base material sensitization, colloidal palladium activation and dispergation.

Preferably, the electroless plating step specifically comprises:

preparing water solution by using water as a solvent and using main salt, a reducing agent, a coordination agent, a buffering agent and an accelerating agent;

adding non-metal particles, pure metal or alloy into the aqueous solution at 40-100 ℃, adjusting the pH to 4-6, and uniformly stirring to obtain chemical plating solution;

and plating the chemical plating solution on the surface of the pretreated plastic base material, and curing and drying to obtain the hydrophobic plating layer.

Preferably, the mass concentration of the main salt in the aqueous solution is 15-35g/L, the mass concentration of the reducing agent is 25-40g/L, the mass concentration of the complexing agent is 10-40g/L, the mass concentration of the buffering agent is 10-20g/L, the mass concentration of the accelerating agent is less than 1g/L, and the mass concentration of the hydrophobic particles is 3-15 g/L.

Preferably, the main salt is selected from NiSO₄·6H₂O、NiCl₂·6H₂O、CuSO₄·5H₂O、CuCl₂·2H₂At least one of O, cobalt sulfamate, cobalt chloride and cobalt sulfate;

the reducing agent is selected from at least one of sodium hypophosphite, dimethyl amino borane, hydrazine, potassium borohydride and formaldehyde, and sodium hypophosphite is preferred;

the complexing agent is selected from at least one of glycolic acid, citric acid, lactic acid, malic acid, propionic acid, salicylic acid, glycine, succinic acid, aminoacetic acid, EDTA, tartaric acid, ethylenediamine, ammonia, sodium cyanide and potassium hydrosulfide, preferably at least one of glycolic acid, citric acid, lactic acid, malic acid, propionic acid, salicylic acid, glycine, succinic acid, aminoacetic acid and tartaric acid;

the buffer is selected from at least one of monocarboxylic acid type, dicarboxylic acid type, hydroxycarboxylic acid type, boric acid, carbonic acid and sulfurous acid;

the accelerator is at least one selected from the group consisting of glycine, alanine, aminobutyric acid and aspartic acid.

Preferably, the plating time of the chemical plating solution is 10-40min, and the thickness of the hydrophobic plating layer is 0.02-15 μm.

Preferably, the stirring method is mechanical stirring, air stirring, flat pump stirring or air circulation.

The invention provides an air conditioner water pan, which comprises the hydrophobic coating according to any technical scheme.

Compared with the prior art, the invention has the advantages and positive effects that:

the invention provides a hydrophobic coating and an air-conditioning water pan containing the same. A microscopic hydrophobic surface coating is formed on the surface of the coating, so that a good self-cleaning effect can be achieved, and in addition, the coating can also achieve an anti-static effect due to the conductivity of the coating.

Drawings

Fig. 1 is a schematic cross-sectional view of a hydrophobic coating according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides a hydrophobic coating which comprises, by mass, 1-30 parts of hydrophobic particles and 70-99 parts of pure metal or alloy.

The hydrophobic coating mentioned in the above embodiment is a micro-rough composite coating prepared by adding non-metallic particles and pure metal or alloy to a basic chemical plating solution for co-deposition, and the coating not only can realize a self-cleaning effect and prevent dust accumulation and microorganism enrichment, but also has a static electricity removing effect due to excellent conductivity.

In a preferred embodiment, the hydrophobic particles in the hydrophobic coating are 5-10% by mass, and the particle size of the hydrophobic particles is 0.1-10 μm.

In the above preferred embodiment, the hydrophobic particles may be selected from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30% or any value within the above-defined range, and fall within the protection scope of the present invention; the particle size of the hydrophobic particles can be selected from 0.1, 0.5, 1.0, 2.0, 4.0, 8.0, 10.0 μm or any value within the above-defined range, and falls within the protection scope of the present invention.

The reason why the content and the particle diameter of the hydrophobic particles are limited to the above ranges is that: when the content of the hydrophobic particles in the coating is less than 1%, the lyophobic performance of the coating is not obviously improved; when the content of the hydrophobic particles is higher than 30%, the hydrophobic particles are continuously added, the coating performance is not obviously improved, and the coating stability is reduced. When the hydrophobic particles are less than 0.1 mu m, the particles are easy to agglomerate in the plating solution, and the dispersibility is poor; when the hydrophobic particles are larger than 10 μm, the deposition efficiency is low and the binding force with the plating layer is poor due to the large particle size.

In a preferred embodiment, the hydrophobic particles are selected from at least one of graphite, silicone powder, hydrophobic silica, polytetrafluoroethylene, graphite fluoride and graphite treated with a cationic surfactant, silicone powder, hydrophobic silica, polytetrafluoroethylene, graphite fluoride, and the pure metal or alloy is selected from at least one of Ni, Cu and Co;

the cationic surfactant is selected from amine salt type, quaternary ammonium salt type, heterocyclic type or caltha salt type.

In the above preferred embodiment, the hydrophobic particles are preferably at least one of graphite, silicone powder, hydrophobic silica, polytetrafluoroethylene, graphite fluoride, which are positively charged after being treated with a cationic surfactant.

An embodiment of the present invention provides a method for preparing a hydrophobic plating layer according to any one of the above embodiments, where the method includes: the method comprises the steps of base material pretreatment and chemical plating, wherein the base material pretreatment comprises base material coarsening, base material sensitization, colloidal palladium activation and dispergation.

In the above preferred embodiment, the substrate can be selected from various plastics such as ABS plastic, PPO modified polyphenylene oxide resin, PA polyamide, POM polyacetal resin, PBT polybutylene terephthalate and the like; the roughening treatment of the base material can select high chromic anhydride solution and sulfuric acid; the base material sensitization treatment can be stannous chloride solution, hydrochloric acid solution or dilute sulfuric acid solution; the colloid palladium activation can be selected from palladium chloride, palladium nitrate, palladium sulfate and palladium phosphate; the peptizing agent can be selected from hydrochloric acid solution, phosphoric acid, sulfuric acid and nitric acid.

In a preferred embodiment, the electroless plating step specifically comprises:

preparing water solution by using water as a solvent and using main salt, a reducing agent, a coordination agent, a buffering agent and an accelerating agent;

adding the hydrophobic particles, pure metal or alloy into the aqueous solution at the temperature of 40-100 ℃, adjusting the pH to 4-6, and uniformly stirring to obtain chemical plating solution;

and plating the chemical plating solution on the surface of the pretreated plastic base material, and curing and drying to obtain the hydrophobic plating layer.

In the preparation method, the main components such as the nonmetal particles can be uniformly dispersed or dissolved in the aqueous solution at 40-100 ℃, and a uniform solution system can be formed within a certain time.

It is also necessary to supplement that, in the above preparation method, the main salt is a substance containing the metal before deposition, and after the displacement reaction, the metal in the main salt is deposited on the surface of the cathode.

In a preferred embodiment, the mass concentration of the main salt in the aqueous solution is 15-35g/L, the mass concentration of the reducing agent is 25-40g/L, the mass concentration of the complexing agent is 10-40g/L, the mass concentration of the buffering agent is 10-20g/L, the mass concentration of the accelerating agent is less than 1g/L, and the mass concentration of the hydrophobic particles is 3-15 g/L.

In the preferred embodiment, the mass concentration of the main salt in the aqueous solution can be selected from 15, 20, 25, 30, 35g/L or any value within the above-defined range, and the mass concentration falls within the protection scope of the present invention; the mass concentration of the reducing agent can be 25, 30, 35, 40g/L or any value in the above limited range, and the mass concentration falls into the protection range of the invention; the mass concentration of the coordination agent can be selected from 10, 20, 30, 40g/L or any value within the above-defined range, and the coordination agent falls within the protection range of the invention; the mass concentration of the buffering agent can be selected from 10, 15, 20g/L or any value within the above-defined range, and the buffering agent falls into the protection scope of the invention; the mass concentration of the hydrophobic particles can be selected from 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15g/L or any value within the above-defined range and fall within the scope of the present invention.

In a preferred embodiment, the primary salt is selected from NiSO₄·6H₂O、NiCl₂·6H₂O、CuSO₄·5H₂O、CuCl₂·2H₂At least one of O, cobalt sulfamate, cobalt chloride and cobalt sulfate;

the reducing agent is selected from at least one of sodium hypophosphite, dimethyl amino borane, hydrazine, potassium borohydride and formaldehyde, and sodium hypophosphite is preferred;

the complexing agent is selected from at least one of glycolic acid, citric acid, lactic acid, malic acid, propionic acid, salicylic acid, glycine, succinic acid, aminoacetic acid, EDTA, tartaric acid, ethylenediamine, ammonia, sodium cyanide and potassium hydrosulfide, preferably at least one of glycolic acid, citric acid, lactic acid, malic acid, propionic acid, salicylic acid, glycine, succinic acid, aminoacetic acid and tartaric acid;

the buffer is selected from at least one of monocarboxylic acid type, dicarboxylic acid type, hydroxycarboxylic acid type, boric acid, carbonic acid and sulfurous acid;

the accelerator is at least one selected from the group consisting of glycine, alanine, aminobutyric acid and aspartic acid.

In a preferred embodiment, the plating time of the electroless plating solution is 10-40min, and the thickness of the hydrophobic plating layer is 0.02-15 μm.

In the above preferred embodiment, the thickness of the hydrophobic coating layer can be selected from 0.02, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0 μm or any value within the above-mentioned limited range, and falls within the protection scope of the present invention; further, the reason why the thickness of the hydrophobic plating layer is limited to 0.02 to 15 μm is that: considering that if the thickness of the plating layer is too high, a significant increase in the manufacturing cost of the plating layer may result, the performance is not greatly increased but the stability is lowered; and the plating layer thickness is too low, which easily causes the problems of poor self-cleaning effect of the plating layer and the like.

The invention also provides an air-conditioning water pan, which comprises the hydrophobic coating according to any embodiment, wherein the hydrophobic coating has a good hydrophobic effect, the water contact angle is about 117-132 degrees, and the rolling angle of water drops is about 10-15 degrees.

In order to more clearly and specifically describe the hydrophobic coating and the water pan for air conditioner including the hydrophobic coating according to the embodiments of the present invention, the following description will be given with reference to specific embodiments.

Example 1

The embodiment provides a hydrophobic coating, and the preparation method specifically comprises the following steps:

(1) pretreatment of a base material:

selecting ABS plastic as a base material, coarsening by using a high chromic anhydride solution, sensitizing by using a stannous chloride solution of 40g/L and a hydrochloric acid solution of 100ml/L, activating by using palladium chloride, and then treating for 30s for dispergation by using a 100ml/L hydrochloric acid solution at the temperature of 45 ℃ to prepare the plastic base material with platability;

(2) chemical plating:

the preparation of the chemical plating solution is carried out according to the following formula:

NiSO₄·6H₂O，20g/L、NaH₂PO₂·6H₂35g/L of hydrophobic silicon dioxide (2 mu m) treated by cationic surfactant, 5g/L of glycine, a proper amount of lactic acid, 15ml/L of propionic acid and 10ml/L of lactic acid;

preparing chemical plating solution according to the formula at the temperature of 90 ℃, and adjusting the pH value to 4.5;

and (3) applying the chemical plating solution on the surface of the platable plastic substrate, curing and drying to obtain the hydrophobic plating layer (the cross-sectional schematic diagram of the hydrophobic plating layer is shown in figure 1).

Results of the hydrophobicity assay: the water contact angle of the obtained hydrophobic coating can reach 123 degrees, the rolling angle of water drops is 11 degrees, and the metal coating improves the conductivity of the material, so that the antistatic capacity of the material is improved.

Example 2

The embodiment provides a hydrophobic coating, and the preparation method specifically comprises the following steps:

(1) pretreatment of a base material:

selecting ABS plastic as a base material, coarsening by using a high-chromic anhydride solution, sensitizing by using a stannous chloride solution of 40g/L and a hydrochloric acid solution of 100ml/L, activating by using palladium chloride, and then treating for 30s for dispergation by using a 50ml/L sulfuric acid solution at the temperature of 45 ℃ to prepare the plastic base material with platability;

(2) chemical plating:

the preparation of the chemical plating solution is carried out according to the following formula:

NiSO₄·6H₂O，15g/L、NaH₂PO₂·6H₂35g/L of silicone powder (1 mu m) treated by cationic surfactant, 4g/L of glycine, a proper amount of lactic acid, 15ml/L of propionic acid and 10ml/L of propionic acid;

preparing chemical plating solution according to the formula at the temperature of 90 ℃, and adjusting the pH value to 4.5;

and (3) plating the chemical plating solution on the surface of the platable plastic base material, and curing and drying to obtain the hydrophobic plating layer.

Results of the hydrophobicity assay: the water contact angle of the obtained hydrophobic coating can reach 132 degrees, the rolling angle of water drops is 10 degrees, and the metal coating improves the conductivity of the material, so that the antistatic capacity of the material is improved.

Example 3

The embodiment provides a hydrophobic coating, and the preparation method specifically comprises the following steps:

(1) pretreatment of a base material:

selecting PBT plastic as a base material, coarsening by using a high-chromic anhydride and concentrated sulfuric acid solution, sensitizing by using a stannous chloride solution of 40g/L and a hydrochloric acid solution of 100ml/L, activating by using palladium chloride, and then treating for 30s for dispergation by using a 100ml/L hydrochloric acid solution at the temperature of 45 ℃ to prepare the platable plastic base material;

(2) chemical plating:

the preparation of the chemical plating solution is carried out according to the following formula:

CuSO₄·5H₂O，20g/L、NaH₂PO₂·6H₂o, 38g/L of hydrophobic silica (2 mu m) treated by cationic surfactant, 5g/L of glycine, a proper amount of lactic acid, 15ml/L of propionic acid and 10ml/L of propionic acid;

preparing chemical plating solution according to the formula at the temperature of 90 ℃, and adjusting the pH value to 4.5;

and (3) plating the chemical plating solution on the surface of the platable plastic base material, and curing and drying to obtain the hydrophobic plating layer.

Results of the hydrophobicity assay: the water contact angle of the obtained hydrophobic coating can reach 117 degrees, the rolling angle of water drops is 15 degrees, and the metal coating improves the conductivity of the material, so that the antistatic capacity of the material is improved.

Comparative example 1

The comparative example provides a hydrophobic coating, and the preparation method specifically comprises the following steps:

(1) pretreatment of a base material:

selecting PBT plastic as a base material, coarsening by using a high-chromic anhydride and concentrated sulfuric acid solution, sensitizing by using a stannous chloride solution of 40g/L and a hydrochloric acid solution of 100ml/L, activating by using palladium chloride, and then treating for 30s for dispergation by using a 100ml/L hydrochloric acid solution at the temperature of 45 ℃ to prepare the platable plastic base material;

(2) chemical plating:

the preparation of the chemical plating solution is carried out according to the following formula:

CuSO₄·5H₂O，20g/L、NaH₂PO₂·6H₂38g/L of O, glycine, a proper amount of lactic acid, 15ml/L of propionic acid and 10ml/L of propionic acid;

preparing chemical plating solution according to the formula at the temperature of 90 ℃, and adjusting the pH value to 4.5;

and (3) plating the chemical plating solution on the surface of the plastic base material with platability, and curing and drying to obtain a plating layer.

Results of the hydrophobicity assay: the water contact angle of the obtained hydrophobic coating can reach 82 degrees, and the rolling angle of a water drop is 32 degrees.

Comparative example 2

The comparative example provides a hydrophobic coating, and the preparation method specifically comprises the following steps:

(1) pretreatment of a base material:

selecting ABS plastic as a base material, coarsening by using a high chromic anhydride solution, sensitizing by using a stannous chloride solution of 40g/L and a hydrochloric acid solution of 100ml/L, activating by using palladium chloride, and then treating for 30s for dispergation by using a 100ml/L hydrochloric acid solution at the temperature of 45 ℃ to prepare the plastic base material with platability;

(2) chemical plating:

the preparation of the chemical plating solution is carried out according to the following formula:

NiSO₄·6H₂O，20g/L、NaH₂PO₂·6H₂35g/L of O, glycine, a proper amount of lactic acid, 15ml/L of propionic acid and 10ml/L of propionic acid;

preparing chemical plating solution according to the formula at the temperature of 90 ℃, and adjusting the pH value to 4.5;

results of the hydrophobicity assay: and (3) plating the chemical plating solution on the surface of the platable plastic base material, and curing and drying to obtain the hydrophobic plating layer. The water contact angle of the obtained hydrophobic coating can reach 76 degrees, and the rolling angle of water drops is 34 degrees.

Comparative example 3

The comparative example provides a hydrophobic coating, and the preparation method specifically comprises the following steps:

(1) pretreatment of a base material:

selecting ABS plastic as a base material, coarsening by using a high chromic anhydride solution, sensitizing by using a stannous chloride solution of 40g/L and a hydrochloric acid solution of 100ml/L, activating by using palladium chloride, and then treating for 30s for dispergation by using a 100ml/L hydrochloric acid solution at the temperature of 45 ℃ to prepare the plastic base material with platability;

(2) chemical plating:

the preparation of the chemical plating solution is carried out according to the following formula:

NiSO₄·6H₂O，20g/L、NaH₂PO₂·6H₂35g/L of hydrophobic silicon dioxide (2 mu m) treated by cationic surfactant, 1g/L of glycine, a proper amount of lactic acid, 15ml/L of propionic acid and 10ml/L of lactic acid;

preparing chemical plating solution according to the formula at the temperature of 90 ℃, and adjusting the pH value to 4.5;

and (3) plating the chemical plating solution on the surface of the plastic base material with platability, and curing and drying to obtain a plating layer.

Results of the hydrophobicity assay: the water contact angle of the obtained hydrophobic coating can reach 77 degrees, and the rolling angle of water drops is 34 degrees

Comparative example 4

The comparative example provides a hydrophobic coating, and the preparation method specifically comprises the following steps:

(1) pretreatment of a base material:

selecting PBT plastic as a base material, coarsening by using a high-chromic anhydride and concentrated sulfuric acid solution, sensitizing by using a stannous chloride solution of 40g/L and a hydrochloric acid solution of 100ml/L, activating by using palladium chloride, and then treating for 30s for dispergation by using a 100ml/L hydrochloric acid solution at the temperature of 45 ℃ to prepare the platable plastic base material;

(2) chemical plating:

the preparation of the chemical plating solution is carried out according to the following formula:

CuSO₄·5H₂O，20g/L、NaH₂PO₂·6H₂o, 38g/L of hydrophobic silica (2 mu m) treated by cationic surfactant, 24g/L of glycine, a proper amount of lactic acid, 15ml/L of propionic acid, and 10ml/L of propionic acid;

preparing chemical plating solution according to the formula at the temperature of 90 ℃, and adjusting the pH value to 4.5;

and (3) plating the chemical plating solution on the surface of the plastic base material with platability, and curing and drying to obtain a plating layer.

Due to the fact that the addition amount of the hydrophobic particles is too high, the obtained composite coating is poor in adhesion performance and easy to peel off and fall off from the surface of the base material.

Hydrophobic Performance test

The performance test results of the hydrophobic coatings obtained in the above examples and comparative examples are counted, and are shown in the following table:

TABLE 1 statistics of hydrophobic Effect of the hydrophobic coatings of the examples and comparative examples

From the results of the hydrophobic property tests shown in the above examples and comparative examples, it can be seen that comparative examples 1-2 provide a method for preparing a hydrophobic coating layer without adding hydrophobic particles, and the obtained coating layer has a poor hydrophobic effect (water contact angles are 82 °, 76 °, and rolling angles of water droplets are 32 ° and 34 °, respectively), and comparative examples 3-4 provide a method for preparing a hydrophobic coating layer with adding hydrophobic particles (content of hydrophobic particles is 1g/L and 24g/L, respectively), and the obtained coating layer has a poor hydrophobic effect;

examples 1 to 4 each provide a method for preparing a hydrophobic coating, wherein the addition amounts of components such as hydrophobic particles are within the protection range defined by the present invention, and the obtained coating has a good hydrophobic effect, and the water contact angle is about 117 to 132 °, and the rolling angle of water droplets is about 10 to 15 °. Therefore, the hydrophobic coating prepared by the method provided by the invention has good hydrophobic performance, and can be well applied to the water pan of the air conditioner to realize the purpose of self-cleaning.