CN112646486A

CN112646486A - Self-repairing hydrophobic wax-proof coating

Info

Publication number: CN112646486A
Application number: CN202011391979.1A
Authority: CN
Inventors: 黄啸; 谢冠亚; 陈华辉; 范磊; 马峰; 周述军
Original assignee: China University of Mining and Technology Beijing CUMTB
Current assignee: China University of Mining and Technology Beijing CUMTB
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2021-04-13

Abstract

The invention discloses a self-repairing hydrophobic wax-proof coating, which comprises a bottom layer and a surface layer. The main component of the bottom layer is methyl silicone rubber. The surface course is attached to the bottom, and the methyl silicone rubber of bottom can migrate to the surface course, and the principal ingredients of surface course include methyl silicone rubber, hydrophobic treatment agent and nanoparticle, and the hydrophobic treatment agent can carry out surface modification to the nanoparticle, and the nanoparticle can form a plurality of aggregates under methyl silicone rubber's adhesive action, and the surface of each aggregate has the nanoparticle, and a plurality of aggregates distribute in the surface of surface course. The plurality of agglomerates provide a micron-scale roughness to the facing layer and the nanoparticles provide a nano-scale roughness to the facing layer. According to the self-repairing hydrophobic wax-proof coating, the multi-stage rough structure endows the coating with good super-hydrophobicity, scratch resistance and self-repairing property, the surface energy of nano particles is further reduced by using the hydrophobic treatment agent, and the paraffin has fewer nucleation points on the coating, lower adhesive force and good wax-proof performance.

Description

Self-repairing hydrophobic wax-proof coating

Technical Field

The invention relates to the technical field of oil exploitation and transportation, in particular to a self-repairing hydrophobic wax-proof coating.

Background

In the process of crude oil mining, storage and transportation, when the temperature is lower than a wax precipitation point, paraffin components in the crude oil can be slowly precipitated and deposited on the inner wall of a pipeline, so that the pipeline is blocked, and safety accidents are induced. Billions of dollars are spent each year worldwide to solve various problems caused by paraffin deposition in oil extraction and transportation.

The current common measures for dealing with wax deposition are heat flow scouring, mechanical wax removal, chemical wax removal and the like. However, the above measures are passive wax removal schemes with high energy consumption and high pollution.

In addition, a scheme for using the antifouling composite coating to cope with wax deposition is available, but the existing process for preparing the antifouling composite coating is complicated and expensive, and is not beneficial to large-scale production. And the antifouling composite coating is easy to be damaged, and the use value is not high.

Accordingly, there is a need for a self-healing hydrophobic wax resistant coating that at least partially addresses the above problems.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

To at least partially solve the above problems, the present invention provides a self-healing hydrophobic wax-resistant coating comprising:

a bottom layer, the main component of the bottom layer being methyl silicone rubber;

the surface layer is attached to the bottom layer, the methyl silicone rubber of the bottom layer can migrate to the surface layer, the main components of the surface layer comprise methyl silicone rubber, a hydrophobic treatment agent and nanoparticles, the hydrophobic treatment agent can carry out surface modification on the nanoparticles, the nanoparticles can form a plurality of aggregates under the adhesion effect of the methyl silicone rubber of the surface layer, the surface of each aggregate is provided with the nanoparticles, and the aggregates are distributed on the surface of the surface layer;

wherein the plurality of agglomerates provide a micron-scale roughness to the surface layer and the nanoparticles provide a nanoscale roughness to the surface layer.

Further, the methyl silicone rubber is formed by curing a methyl silicone rubber prepolymer and a curing agent, and the mass ratio of the methyl silicone rubber prepolymer to the curing agent is 8-12: 1.

Further, the methyl silicone rubber prepolymer comprises a polydimethylsiloxane prepolymer.

Further, the nanoparticles include nano TiO₂Nano SiO₂And nano Al₂O₃At least one of (1).

Further, the hydrophobic treatment agent includes at least one of a fluorine-containing methacrylic acid oily copolymer, a perfluoroalkyl methacrylic acid copolymer, an alkylsiloxane, a fluorine-containing alkylsiloxane and a fluorine-containing acrylic resin.

Further, the self-repairing hydrophobic wax-proof coating is characterized by being prepared by the following steps which are sequentially carried out:

s1, preparing a bottom layer, wherein the bottom layer preparing step comprises the following steps:

s11, preparing colloid, dissolving the methyl silicone rubber prepolymer and the curing agent in the solvent and mixing evenly,

s12, a pouring step, namely pouring the colloid on the surface of the base material,

s14, a curing step, namely heating the base material to cure the methyl silicone rubber prepolymer and the curing agent to form the bottom layer;

and S2, attaching a surface layer on the surface of the bottom layer.

Further, between the step S12 and the step S14, the method further includes:

and S13, a vacuum treatment step, wherein bubbles in the colloid are removed.

Further, the step S2 includes:

s21, preparing a mixed solution, namely preparing a mixed solution containing the methyl silicone rubber, the hydrophobic treatment agent and the nano particles;

s22, a dip-pulling step, in which the substrate with the bottom layer is dipped into the mixed solution for a preset time and then pulled, and the process is repeated for a plurality of times;

s23, drying and curing, heating, drying and curing to obtain the self-repairing hydrophobic wax-proof coating.

Further, the mixed solution includes:

23 to 27 parts by mass of a solvent;

1-3 parts by mass of a methyl silicone rubber prepolymer;

0.1 to 0.3 parts by mass of a curing agent;

1-3 parts by mass of a hydrophobic treatment agent;

1 to 2.5 parts by mass of nanoparticles.

Further, the step S21 further includes:

adding the nano particles into a solvent, dissolving the methyl silicone rubber prepolymer and the hydrophobic treatment agent in the solvent, and then performing ultrasonic oscillation;

and continuing to perform ultrasonic oscillation after the curing agent is added.

Further, the adhesion strength between the self-repairing hydrophobic wax-resistant coating and the paraffin wax is less than or equal to 32 KPa.

According to the self-repairing hydrophobic wax-proof coating, the multi-stage rough structure endows the coating with good super-hydrophobicity, scratch resistance and self-repairing property, the surface energy of nano particles is further reduced by using the hydrophobic treatment agent, and the paraffin has fewer nucleation points on the coating, lower adhesive force and good wax-proof performance.

Drawings

The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In the drawings:

FIG. 1 is a schematic structural view of a self-healing hydrophobic wax resistant coating according to the present invention;

FIG. 2 is a simplified flow diagram of a method for preparing a self-healing hydrophobic wax resistant coating according to the present invention;

FIG. 3 is a detailed flow diagram of a method for preparing a self-healing hydrophobic wax resistant coating according to the present invention;

FIG. 4 is a microscopic surface topography of the surface of the coating prepared according to comparative example 1, wherein the mixed solution during the preparation process does not add nano TiO₂；

FIG. 5 is a microscopic surface topography of the surface of the coating prepared according to comparative example 2, wherein 0.5g of nano TiO was added to the mixed solution during the preparation process₂；

FIG. 6 is a microscopic surface topography of the surface of the coating prepared according to example 1 of the present invention, wherein 1g of nano TiO was added to the mixed solution during the preparation process₂；

FIG. 7 is a microscopic surface topography of the surface of a coating prepared according to example 2 of the present invention, wherein 1.5g of nano TiO was added to the mixed solution during the preparation process₂；

FIG. 8 is a microscopic surface topography of the surface of a coating prepared according to example 3 of the present invention, wherein 2g of nano TiO was added to the mixed solution during the preparation process₂；

FIG. 9 is a microscopic surface topography of the surface of the coating prepared according to example 4 of the present invention, in which 2.5g of nano TiO was added to the mixed solution during the preparation process₂；

FIG. 10 shows the addition of different amounts of nano TiO₂Finally obtained fromRepairing the change graph of the contact angle and the contact angle hysteresis of the hydrophobic wax-proof coating;

FIG. 11 is a graph of adhesion of a smooth glass surface to paraffin wax;

FIG. 12 is a graph showing the adhesion of the surface of the coating prepared in comparative example 1 to paraffin wax;

FIG. 13 is a graph showing the adhesion of the surface of the coating prepared in example 1 of the present invention to paraffin wax;

FIG. 14 is a graph of contact angle measurements after a linear abrasion test of the self-healing hydrophobic wax-resistant coating obtained in example 1 according to the present invention;

FIG. 15 is a micro-topography of a wear site of the self-healing hydrophobic wax-repellent coating of FIG. 14;

FIG. 16 is a graph of contact angle measurements after UV damage of the self-healing hydrophobic wax-resistant coating obtained in example 1 according to the present invention; and

fig. 17 is a contact angle measurement chart of the self-healing hydrophobic wax-resistant coating in fig. 16 after being heated for healing.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.

In the following description, a detailed description will be given in order to thoroughly understand the present invention. It is apparent that the implementation of the embodiments of the invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.

It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

As shown in FIG. 1, the self-healing hydrophobic wax-repellent coating of the present invention comprises a bottom layer 1 attached to a substrate and a top layer 2 attached to the bottom layer 1. The main component of the bottom layer 1 is methyl silicone rubber. The main components of the surface layer 2 comprise methyl silicone rubber, a hydrophobic treatment agent and nano particles.

Wherein the methyl silicone rubber of the bottom layer 1 is capable of migrating to the face layer 2. The bottom layer 1 can thus function to store and migrate low surface energy substances to the face layer 2, allowing self-healing in the event of damage to the face layer 2.

The hydrophobic treatment agent in the surface layer 2 can perform surface modification on the nano particles, so that the surface energy of the nano particles is reduced. And the nano particles can form a plurality of agglomerates 3 under the adhesion action of methyl silicone rubber, the surface of each agglomerate 3 is provided with the nano particles, and the plurality of agglomerates 3 are distributed on the surface 2 of the surface layer.

Thus, the plurality of agglomerates 3 provide a micron-scale roughness to the surface layer 2, and the nanoparticles provide a nano-scale roughness to the surface layer 2, forming a multi-level roughness structure.

According to the self-repairing hydrophobic wax-proof coating, the multi-stage rough structure endows the coating with good super-hydrophobicity, scratch resistance and self-repairing property, the surface energy of nano particles is further reduced by using the hydrophobic treatment agent, and the paraffin has fewer nucleation points on the coating, lower adhesive force and good wax-proof performance. The adhesive strength between the self-repairing hydrophobic wax-proof coating and the paraffin is less than or equal to 32 KPa. Is particularly suitable for the original oil-water two-phase flow working condition of transportation.

The methyl silicone rubber is preferably formed by curing a methyl silicone rubber prepolymer and a curing agent, and the mass ratio of the methyl silicone rubber prepolymer to the curing agent is preferably 8-12: 1. More preferably, the mass ratio of the methyl silicone rubber prepolymer to the curing agent is 10: 1.

The methyl silicone rubber prepolymer is preferably polydimethylsiloxane prepolymer. For example, carboxyl-terminated polydimethylsiloxane, hydroxyl-terminated polydimethylsiloxane, amino-terminated polydimethylsiloxane, or the like. Illustratively, methyl silicone rubber is commercially available, such as Dow Corning 184 silicone rubber.

The curing agent preferably has the general formula:

R_4-n-Si-Y_n(n-3 or 4) wherein R is an alkyl group and Y is a hydrolyzable group or a thermally decomposable group.

The nanoparticles may be nano TiO₂Nano SiO₂And nano Al₂O₃At least one of (1). Preferably, the nanoparticles are nano-TiO₂。

The hydrophobic treatment agent may be at least one of a fluorine-containing methacrylic acid oily copolymer, a perfluoroalkyl methacrylic acid copolymer, an alkylsiloxane, a fluorine-containing alkylsiloxane and a fluorine-containing acrylic resin. Among them, the alkylsiloxane may be further preferably an alkylsiloxane having a carbon chain length of more than four. More preferably, the hydrophobic treatment agent is a fluorine-containing methacrylic acid oily copolymer.

Illustratively, the above-mentioned fluorine-containing methacrylic acid oily copolymer can be obtained by purchase, for example, Sishi chemical SG-33.

The manufacturing method of the self-repairing hydrophobic wax-proof coating of the invention can refer to fig. 2 and 3. Which comprises the following steps:

s1: and preparing a bottom layer.

S2: and attaching a surface layer on the surface of the bottom layer.

Specifically, the step S1 of preparing the bottom layer further includes:

s11: and a colloid preparation step, namely dissolving the methyl silicone rubber prepolymer and the curing agent in a solvent and uniformly mixing, for example, shaking and mixing for 5 minutes.

S12: and a pouring step, namely pouring the colloid on the surface of the base material.

S14: and a vacuum treatment step, wherein air bubbles in the colloid are removed. Namely, the base material coated with the colloid is put into a vacuum box and vacuumized until the bubbles are completely removed.

S13: and a curing step, namely, putting the base material coated with the colloid into an oven for heating, so that the methyl silicone rubber prepolymer and the curing agent are cured to form a bottom layer.

The step S2 of attaching the surface layer to the surface of the bottom layer further includes:

s21: and preparing a mixed solution, namely preparing the mixed solution containing the methyl silicone rubber, the hydrophobic treatment agent and the nano particles. Firstly, adding nanoparticles into a solvent, then dissolving the methyl silicone rubber prepolymer and the hydrophobic treatment agent in the solvent, and then carrying out ultrasonic oscillation. And continuing to perform ultrasonic oscillation after adding the curing agent.

S22: and a dipping and pulling step, namely dipping the substrate with the bottom layer into the mixed solution for a preset time, pulling and repeating for multiple times. For example, the dipping is carried out for 5 minutes, and then the pulling is carried out for 5 times in total.

S23: and a drying and curing step, namely putting the pulled substrate into a drying oven for heating and drying, and curing to obtain the self-repairing hydrophobic wax-proof coating.

The composition of the mixed solution is preferably as follows: 23-27 parts by mass of a solvent, 1-3 parts by mass of a methyl silicone rubber prepolymer, 0.1-0.3 part by mass of a curing agent, 1-3 parts by mass of a hydrophobic treatment agent and 1-2.5 parts by mass of nanoparticles. More preferably, the solvent is 15 parts by mass, the methyl silicone rubber prepolymer is 2 parts by mass, the curing agent is 0.2 parts by mass, the hydrophobic treatment agent is 2 parts by mass, and the nanoparticles are 1.5 parts by mass.

The self-healing hydrophobic wax-repellent coating of the present invention will be described in more detail with reference to specific examples and comparative examples.

Example 1

Dissolving polydimethylsiloxane prepolymer in a proper amount of butyl acetate, and adding a curing agent into the dimethyl siloxane prepolymer, wherein the weight ratio of the prepolymer to the curing agent is 10: 1. and then oscillating for 5min at constant speed by using a Votex-1 type vortex mixer to obtain uniform colloid. Pouring the uniformly mixed colloid on the surface of any base material, and putting the base material into a vacuum box for vacuumizing until bubbles are completely removed. And then putting the substrate into a drying oven to be cured for 2 hours at the temperature of 80 ℃ to prepare the bottom layer of the self-repairing hydrophobic wax-proof coating attached to the substrate.

Mixing 1gOf nano TiO₂Adding 25g of butyl acetate, dissolving 2g of polydimethylsiloxane prepolymer into the butyl acetate, and adding 2g of fluorine-containing methacrylic acid oily copolymer. Shaking for 1h by using an ultrasonic oscillator to enable the nano TiO to be₂Uniformly dispersing, adding 0.2g of polydimethylsiloxane curing agent, and continuing shaking for 10min to obtain a uniform mixed solution. And (3) soaking the base material attached with the bottom layer in the mixed solution for 5min, pulling and repeating for 5 times. And then, putting the pulled substrate attached with the mixed solution into a drying oven, drying and curing at 105 ℃ for 8h, and finally obtaining the self-repairing hydrophobic wax-proof coating.

Example 2

This example is substantially the same as example 1 except that nano TiO is used₂The amount of (B) was 1.5 g.

Example 3

This example is substantially the same as example 1 except that nano TiO is used₂The amount of (2) added was 2 g.

Example 4

This example is substantially the same as example 1 except that nano TiO is used₂The amount of (2) added was 2.5 g.

Comparative example 1

This comparative example is substantially the same as example 1 except that no nano TiO was added₂。

Comparative example 2

This comparative example is substantially the same as example 1 except that nano TiO was used₂The amount of (B) was 0.5 g.

Comparative example 3

This comparative example is substantially the same as the production process of example 2 except that no fluorine-containing methacrylic acid oily copolymer is added.

Comparative example 4

This comparative example was prepared substantially the same as example 2 except that the polydimethylsiloxane prepolymer and the curing agent were not added to the mixed solution.

FIGS. 4 to 9 show the addition of different amounts of nano TiO to the mixed solution₂And finally obtaining a microscopic surface topography of the self-repairing hydrophobic wax-proof coating. Wherein fig. 4 represents comparative example 1, fig. 5 represents comparative example 2, fig. 6 represents example 1, fig. 7 represents example 2, fig. 8 represents example 3, and fig. 9 represents example 4. It can be seen that no nano TiO is added₂The surface of (a) is a continuous smooth coating. While adding nano TiO₂Then, with nano TiO₂The addition amount of the self-repairing hydrophobic wax-proof coating is increased, the surface appearance of the finally obtained self-repairing hydrophobic wax-proof coating is more distinct, and a multi-level rough structure is formed.

FIG. 10 shows the addition of different amounts of nano TiO₂And finally obtaining a change diagram of the contact angle and the contact angle hysteresis of the self-repairing hydrophobic wax-proof coating. It can be seen that, as shown in Table 1, with nano TiO₂The contact angle of the self-repairing hydrophobic wax-proof coating is gradually increased and then gradually decreased when the addition amount of the self-repairing hydrophobic wax-proof coating is increased. The contact angle hysteresis is contrary to the tendency to decrease rapidly and then increase gently.

Among them, the self-healing hydrophobic wax-resistant coating obtained in example 2 has the largest contact angle and the smallest contact angle hysteresis. And, in the nano TiO₂When the amount of (3) is more than 1.5g, the contact angle does not increase and the contact angle hysteresis does not decrease.

Thus, it can be said that the nano TiO₂The addition of (2) is 1.5g, which is the most preferable example, and the contact angle is as high as 154 DEG, while the contact angle hysteresis is only about 2 deg.

When nano TiO₂When the addition amount of the TiO is more than 1.5g, the performance of the finally obtained self-repairing hydrophobic wax-proof coating is not improved any more, namely more TiO is added₂Waste can occur.

TABLE 1 hydrophobicity test results for examples 1-4 and comparative examples 1-2

	Nano TiO 2₂Adding amount of	Contact angle	Contact angle hysteresis
				Comparative example 1	0	115°	24°
Comparative example 2	0.5g	132°	16°
				Example 1	1g	142°	12°
Example 2	1.5g	154°	2°
				Example 3	2g	155°	11°
Example 4	2.5g	153°	10°

Fig. 11, 12 and 13 are graphs of the adhesion of paraffin to different surfaces. Where figure 11 is a graph of paraffin wax on a smooth glass surface, which can be used for comparison. Fig. 12 is a graph showing adhesion of the coating surface of comparative example 1 to paraffin wax. Fig. 13 is a graph of the adhesion of the coating surface of example 2 to paraffin.

Wherein the paraffin wax has a maximum adhesion on a smooth glass surface of about 17N. The adhesion of paraffin wax on the surface of the comparative example was only around 30% of that on a smooth glass surface, i.e. around 5.1N maximum adhesion. The adhesion of the paraffin wax on the surface of example 2 was reduced by about 40% more than on the surface of comparative example 1, i.e. the adhesion was at most about 3.2N. In this experiment, the size of the contact surface of the paraffin wax for test with the surface of example 2 was about 1cm × 1cm, from which the adhesion strength was calculated to be about 32 KPa.

The self-repairing hydrophobic paraffin-resistant coating reduces the liquid-solid contact area of paraffin when the paraffin is solidified, meanwhile, the nano particles provide crack sources for interface fracture, the adhesion strength between the self-repairing hydrophobic paraffin-resistant coating and the paraffin is only 32KPa, and the coating has a potential paraffin deposition prevention effect.

Fig. 14 is a contact angle measurement chart of the self-repairing hydrophobic wax-proof coating obtained in example 2 after a linear abrasion test. The linear wear test refers to: the self-healing hydrophobic wax-repellent coating was moved 100cm on 1500 mesh sandpaper with a load of 100 g. The results of the hydrophobicity test showed an advancing angle of 157 °, a receding angle of 152 °, and a static contact angle of 152 °. Therefore, the self-repairing hydrophobic wax-proof coating still keeps good super-hydrophobicity after a linear abrasion test.

Fig. 15 is a microscopic topography of a wear part of the self-repairing hydrophobic wax-resistant coating obtained in example 2 after a linear wear experiment. It can be seen that the self-repairing hydrophobic wax-resistant coating leaves scratches after abrasion, but the surface still has multilevel roughness characteristics of micron-nanometer grading.

FIG. 16 is a graph of the measurement of superhydrophobicity of the self-healing hydrophobic wax-repellent coating obtained in example 2 of the present invention after UV light damage. As can be seen from the graph, the test results for superhydrophobicity show that the static contact angle is 145 °, the advancing angle is 154 °, the receding angle is 126 °, and the contact angle hysteresis is 28 °. Obviously, the hydrophobicity of the self-repairing hydrophobic wax-proof coating is obviously reduced after the self-repairing hydrophobic wax-proof coating is damaged by ultraviolet irradiation, and the contact angle hysteresis is greatly increased.

This is due to the fact that TiO when the surface of the self-healing hydrophobic wax-resistant coating is subjected to UV irradiation₂The photocatalytic effect of the nano TiO nano composite material is beneficial to the decomposition of organic matters, and the nano TiO nano composite material is wrapped in the nano TiO while decomposing surface pollutants₂The polydimethylsiloxane on the surface can also be partially decomposed, so that the nano TiO with hydrophilic interior can be obtained₂Exposed outside, a pinning point is introduced, so that the adhesion of the coating to water is increased, the contact angle is reduced, and simultaneously, the contact angle hysteresis is greatly increased.

FIG. 17 is a chart of the superhydrophobicity measurement of the self-healing hydrophobic wax-repellent coating of FIG. 16 after thermal healing. It was measured that the static contact angle was 153 °, the advancing angle was 157 °, the receding angle was 148 °, and the contact angle hysteresis was 9 °. It can be seen that the ultrahydrophobicity of the coating damaged by uv light is restored after thermal remediation, and the contact angle hysteresis is also significantly reduced compared to fig. 16, and both the hydrophobicity and the wax-proofing properties are restored.

The reason is that after the coating is heated, the fluorine-containing methacrylic acid oily copolymer with lower surface energy and the polydimethylsiloxane in the surface layer can migrate to the surface of the coating to re-use the hydrophilic nano TiO₂The particles wrap and the hydrophobicity of the coating is recovered. The primary coating of the coating also has the function of storing low surface energy modifiers, and the polydimethylsiloxane can migrate upwards in the heat treatment process to supplement the loss of the mixed coating.

In addition, in comparative example 3, the hydrophobic treatment agent is not added, and the hydrophobicity test shows that the contact angle can only reach about 130 degrees, which is much lower than 154 degrees of example 2. This is due to TiO₂The addition of the hydrophobic treatment agent can effectively improve the surface energy of the particlesHigh hydrophobic property of the coating.

In comparative example 4, the polydimethylsiloxane prepolymer and the curing agent were not added to the mixed solution during the preparation process, that is, the surface layer did not contain polydimethylsiloxane. The nano particles on the surface layer are easy to fall off, the durability of the coating is greatly reduced, and the self-repairing performance of the coating is lost.

In conclusion, the self-repairing hydrophobic wax-proof coating with both superhydrophobicity and wax deposition resistance is prepared by compounding the high-elasticity polymer coating and the lotus leaf effect, wherein the polydimethylsiloxane high-elasticity polymer bottom layer plays roles in fixing surface particles, generating deformation slippage and storing a low-surface-energy reagent.

Surface TiO₂The nanoparticles function to maintain the Cassie-Baxter state (state where the liquid is in contact with only the convex surface of the microstructure), reduce the nucleation rate of paraffin wax, and generate interfacial defects. In a single TiO₂Simultaneous with the particle build-up of nano-roughness, TiO₂The aggregate of the hydrophobic water treatment agent and the polydimethylsiloxane forms a micron-sized coarse structure, and the multi-level coarse structure endows the coating with good super-hydrophobic and scratch-resistant characteristics.

The self-repairing hydrophobic paraffin-resistant coating reduces the liquid-solid contact area of paraffin when the paraffin is solidified, and meanwhile, the nano particles provide crack sources for interface fracture, so that the adhesion strength between the coating and the paraffin is only 32KPa, and the coating has a potential paraffin deposition resistant effect.

In addition, the self-repairing hydrophobic wax-proof coating has good mechanical durability, and can still keep super-hydrophobicity after being worn by abrasive paper; the coating also has good self-repairing capability, and the failure of the coating caused by ultraviolet irradiation can be recovered by a simple heat treatment mode.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A self-healing hydrophobic wax resistant coating, comprising:

2. The self-repairing hydrophobic wax-proof coating as claimed in claim 1, wherein the methyl silicone rubber is formed by curing a methyl silicone rubber prepolymer and a curing agent, and the mass ratio of the methyl silicone rubber prepolymer to the curing agent is 8-12: 1.

3. The self-healing hydrophobic paraffin control coating of claim 2, wherein the methyl silicone rubber prepolymer comprises a polydimethylsiloxane prepolymer;

the nanoparticles comprise nano TiO₂Nano SiO₂And nano Al₂O₃At least one of (1).

4. The self-healing hydrophobic paraffin control coating of claim 1, wherein the hydrophobic treatment agent comprises at least one of a fluoro methacrylic acid oil copolymer, a perfluoroalkyl methacrylic acid copolymer, an alkyl siloxane, a fluoro alkyl siloxane, and a fluoro acrylic resin.

5. The self-healing hydrophobic wax-resistant coating of any one of claims 1 to 4, wherein the self-healing hydrophobic wax-resistant coating is made by sequentially performing the following steps:

and S2, attaching a surface layer on the surface of the bottom layer.

6. The self-healing hydrophobic wax-resistant coating of claim 5, further comprising, between the step S12 and the step S14:

and S13, a vacuum treatment step, wherein bubbles in the colloid are removed.

7. The self-healing hydrophobic paraffin-resistant coating of claim 5, wherein the step S2 comprises:

8. The self-healing hydrophobic paraffin-resistant coating of claim 7, wherein the mixed solution comprises:

23 to 27 parts by mass of a solvent,

1 to 3 parts by mass of a methyl silicone rubber prepolymer,

0.1 to 0.3 parts by mass of a curing agent,

1 to 3 parts by mass of a hydrophobic treatment agent,

1 to 2.5 parts by mass of nanoparticles.

9. The self-healing hydrophobic paraffin-resistant coating of claim 8, wherein the step S21 further comprises:

10. The self-healing hydrophobic paraffin-protective coating of claim 1, wherein the adhesion strength between the self-healing hydrophobic paraffin-protective coating and paraffin wax is less than or equal to 32 KPa.