CN112898878B

CN112898878B - Rough substrate for a smooth porous surface impregnated with a lubricating fluid, smooth porous surface impregnated with a lubricating fluid and method for the production thereof

Info

Publication number: CN112898878B
Application number: CN202110303240.9A
Authority: CN
Inventors: 李伟华; 赵书瑞; 杨皓程; 李玉堂
Original assignee: Sun Yat Sen University
Current assignee: Sun Yat Sen University
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2022-05-17
Anticipated expiration: 2041-03-22
Also published as: CN112898878A

Abstract

The application belongs to the technical field of bionic super-smooth coatings, and particularly relates to a rough substrate for a smooth porous surface for filling lubricating liquid, the smooth porous surface for filling the lubricating liquid and a preparation method of the smooth porous surface. The present application provides a method for preparing a rough substrate for a smooth porous surface impregnated with a lubricating fluid, comprising: mixing epoxy resin and diethylenetriamine to prepare a mixture; coating the mixture on a base material to prepare a composite base material; and curing the composite base material in an environment with the relative humidity of 60-95% to obtain the rough substrate with the smooth porous surface for pouring the lubricating liquid. The application provides a rough substrate for a smooth porous surface for filling lubricating liquid, the smooth porous surface for filling lubricating liquid and a preparation method thereof, which can effectively solve the technical defects of poor adhesion between a low surface energy polymer of SLIPS and the substrate and unstable mechanical properties.

Description

Rough substrate for a smooth porous surface impregnated with a lubricating fluid, smooth porous surface impregnated with a lubricating fluid and method for the production thereof

Technical Field

The application belongs to the technical field of bionic super-smooth coatings, and particularly relates to a rough substrate for a smooth porous surface for filling lubricating liquid, the smooth porous surface for filling the lubricating liquid and a preparation method of the smooth porous surface.

Background

The bionic super-smooth coating is a research hotspot in nearly 10 years, and has wide application prospects in the fields of self-cleaning coatings, marine corrosion and pollution prevention, drag reduction, ice coating prevention, enhanced heat transfer, biomedicine and microfluidics. The smooth Porous surface (SLIPS) filled with lubricating Liquid is a bionic super-smooth coating of the smooth surface of the nepenthes.

SLIPS with smooth and porous surface infused with lubricating liquid can be prepared by a bottom-up (from bottom to up) method, i.e. SLIPS is prepared by assembling small structural units to form a rough surface and then carrying out subsequent treatment, such as polymerization of polymer monomers. The Lei group prepares a polystyrene-high internal phase emulsion (PS-HIPE) membrane with a communicated porous structure by a high internal phase emulsion polymerization method, and prepares a SLIPS after silicone oil is poured, wherein the coating has excellent self-cleaning performance.

The 'bottom-up' method is harsh on selection of base materials, and is mostly low surface energy polymers such as polypropylene (PP), Polytetrafluoroethylene (PVDF), Polydimethylsiloxane (PDMS) and the like, and the base materials are poor in adhesion with a substrate as a coating due to the low surface energy characteristic and poor in mechanical property, so that the purpose of industrial application is difficult to achieve.

Disclosure of Invention

In view of the above, the present application provides a rough substrate for a smooth porous surface to be infused with a lubricating liquid, and a preparation method thereof, which can effectively solve the technical defects of poor adhesion between a low surface energy polymer of SLIPS and the substrate and unstable mechanical properties.

The present application provides, in a first aspect, a method for preparing a rough substrate for a smooth porous surface impregnated with a lubricating fluid, comprising:

mixing epoxy resin and diethylenetriamine to prepare a mixture;

coating the mixture on a base material to prepare a composite base material;

and curing the composite base material in an environment with the relative humidity of 60-95% to obtain the rough substrate with the smooth porous surface for pouring the lubricating liquid.

In another embodiment, the composite substrate is cured in an environment with a relative humidity of 75% to 95% to obtain a rough substrate for pouring a smooth porous surface of a lubricating liquid.

In another embodiment, the mass ratio of the epoxy resin to the diethylenetriamine is (5-12): 1.

in another embodiment, the mass ratio of the epoxy resin to the diethylenetriamine is 10: 1.

In another embodiment, the epoxy resin is an E-type epoxy resin, and the average epoxy value of the E-type epoxy resin is 0.01-0.55.

In another embodiment, the epoxy resin E is bisphenol A epoxy resin, and is classified into E-01, E-03, E-06, E-12, E-14, E-20, E-31, E-35, E-42, E-44, E-51, E-55 and the like according to epoxy value.

In another embodiment, the E-type epoxy resin is an E44 or E51 epoxy monomer.

In another embodiment, the mixing further comprises centrifugal degassing, wherein the centrifugal degassing has a centrifugal rotation speed of 1000-9000 rpm, and the centrifugal degassing has a centrifugal time of 60-600 s.

In another embodiment, the mixing further comprises centrifugal degassing, wherein the centrifugal degassing has a centrifugal rotation speed of 6000rpm, and the centrifugal degassing has a centrifugal time of 60 s.

In another embodiment, the substrate is a conventional substrate, such as a glass sheet, a metal substrate, or the like.

In a second aspect, the present application provides a rough substrate for a smooth porous surface impregnated with a lubricating fluid, comprising the rough substrate produced by the method of preparation.

In a third aspect, the present application provides a method for preparing a smooth porous surface impregnated with a lubricating fluid, comprising:

soaking the rough substrate in hydrophobic modification liquid for hydrophobic modification, and drying to obtain a hydrophobic rough substrate, wherein the rough substrate is the rough substrate with the smooth porous surface for filling lubricating liquid;

infusing a low surface energy polymer into the hydrophobic rough substrate to prepare a smooth porous surface infused with the lubricating fluid.

In another embodiment, the time for the hydrophobic modification is 30min to 120 min.

In another embodiment, the time for the hydrophobic modification is 30 min.

In another embodiment, the hydrophobic modification solution has a solute selected from the group consisting of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane, vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, phenylaminopropyltrimethoxysilane, gamma-isocyanatopropyltriethoxysilane, acryloxypropyltrimethoxysilane, one or more of gamma-aminopropyltriethoxysilane, N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane, gamma-glycidoxypropylmethyldiethoxysilane, gamma-glycidoxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane, gamma-mercaptopropyltrimethoxysilane, gamma-chloropropyltriethoxysilane, and triethoxymethylsilane; the solvent of the hydrophobic modification liquid is ethanol; the volume ratio of the solute of the hydrophobic modification liquid to the solvent of the hydrophobic modification liquid is 1: (9-99).

In another embodiment, the volume ratio of the solute of the hydrophobic modification liquid to the solvent of the hydrophobic modification liquid is 1: 99.

In another embodiment, the drying temperature is 25 ℃ to 80 ℃.

In another embodiment, the low surface energy polymer is selected from one or more of perfluoropolyether oil, dimethicone, polydimethylsiloxane pdms (polydimethylsiloxane), liquid paraffin (liquid paraffin), and vegetable oil.

Specifically, Dimethyl silicone oil (viscosity range: 10cst, 50cst, 100cst, 500cst, 1000cst, etc.).

Specifically, the vegetable oil can be soybean oil, flax oil, etc.

In a fourth aspect, the present application provides a lubricating fluid infused smooth porous surface, including lubricating fluid infused smooth porous surfaces made by the method of making.

The application creatively uses hygroscopic diethylenetriamine as a curing agent and an epoxy resin monomer as a precursor. Under the condition of high humidity mixing, curing and forming holes on the base material based on a breathing diagram method, so as to realize the construction of the SLIPS rough porous substrate, and the size of the pore diameter can be adjusted by changing the humidity; the preparation method utilizes the advantages of strong adhesion between the epoxy resin and the substrate and stable mechanical property, and combines the advantages of diethylenetriamine hygroscopicity, simple preparation process by a respiring graph method and convenience for large-area preparation. In addition, after the rough substrate for SLIPS is prepared, the rough substrate is subjected to hydrophobic modification and the lubricating liquid is poured, so that the preparation of SLIPS is realized.

In summary, the present application has the following advantages:

(1) the rough substrate mixture (namely the mixture of the epoxy resin and the diethylenetriamine) can be directly applied to commercial coatings, can be coated on substrates such as metal, plastic, glass, concrete and the like, and has strong substrate adhesion;

(2) the method has the advantages of simple preparation process, fast coating preparation and forming, greatly shortened preparation period and large-area preparation by using a respiring graph method.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is a schematic flow chart of the preparation of a rough substrate with smooth porous surface for pouring lubricating fluid according to the embodiment of the present application;

FIG. 2 is a topographical view of a rough porous substrate produced by natural curing in an environment with a relative humidity of 90% as provided in the examples herein;

FIG. 3 is a statistical plot of surface morphology, pore size distribution and porosity of a rough porous substrate prepared at a relative humidity of 60% as provided in example 8 of the present application;

FIG. 4 is a statistical plot of surface morphology, pore size distribution and porosity of a rough porous substrate prepared at a relative humidity of 70% as provided in example 8 of the present application;

FIG. 5 is a statistical plot of surface morphology, pore size distribution and porosity of a rough porous substrate prepared at a relative humidity of 80% as provided in example 8 of the present application;

FIG. 6 is a surface topography of a roughened porous substrate prepared at a relative humidity of 90% as provided in example 8 of the present application;

FIG. 7 is a statistical plot of the porosities of the coarse porous substrate with a relative humidity of 60%, the coarse porous substrate with a relative humidity of 70%, the coarse porous substrate with a relative humidity of 80%, and the coarse porous substrate with a relative humidity of 90%, provided in example 8 of the present application;

FIG. 8 is a statistical analysis of the adhesion data for EP-SLIPS and Eco-EP provided in the examples of the present application;

FIG. 9 is a pictorial representation of an EP-SLIPS provided in an embodiment of the present application before and after adhesion testing;

FIG. 10 is a graph of ice adhesion prevention data for various products provided in example 8 of the present application;

FIG. 11 is a topographical view of a comparative product provided in a comparative example of the present application.

Detailed Description

The application provides a rough substrate for a smooth porous surface for filling lubricating liquid, the smooth porous surface for filling lubricating liquid and a preparation method thereof, which are used for solving the technical defects of poor adhesion between a low surface energy polymer of SLIPS and the substrate and unstable mechanical property in the prior art.

The technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, 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 application.

The raw materials and reagents used in the following examples are commercially available or self-made.

The metal substrate of the following examples may be a common metal substrate such as a copper sheet, an iron sheet, an aluminum sheet, or an alloy thereof.

The preparation method of the smooth porous surface of the perfusion lubricating liquid provided by the embodiment of the application comprises the following steps:

1. referring to fig. 1, epoxy resin monomer and diethylenetriamine are uniformly mixed according to a certain proportion, and are centrifuged and degassed to obtain a uniform mixture, the mixture is uniformly coated on a substrate, and the substrate is placed in a high humidity environment to be cured to obtain a rough substrate (hereinafter referred to as rough porous substrate) with a smooth porous surface for pouring lubricating liquid; the left schematic diagram of fig. 1 shows that the epoxy resin monomer and the diethylenetriamine are uniformly mixed according to a certain proportion, the central schematic diagram of fig. 1 shows that the mixture is uniformly coated on the substrate, and the right schematic diagram of fig. 1 shows that the substrate is placed in a high-humidity environment.

2. And soaking the prepared rough porous substrate into a 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane ethanol solution for hydrophobic modification, and drying to obtain the hydrophobic rough porous substrate.

3. And (3) pouring the perfluoropolyether lubricating liquid into the prepared hydrophobic rough porous substrate to obtain the liquid poured super-smooth coating.

Wherein the epoxy resin monomer in the step 1 is: e44 or E51 epoxy monomer; the curing agent is: diethylenetriamine; the mass ratio of the monomer to the curing agent is 10: 1; the centrifugal speed is 6000 rpm; the centrifugation time is 60 s; the environmental humidity is 75-95% of the relative humidity.

Wherein the volume ratio of the 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane to the ethanol in the step 2 is 1: 99. The hydrophobization time was 30 min. The drying temperature is 25-80 ℃.

Example 1

10g E44 epoxy resin and 1g diethylenetriamine were added to a beaker at the same time, and after stirring uniformly with a glass rod, the mixture was degassed by rotating the beaker at 6000rpm for 6 minutes by a centrifuge to prepare a mixture.

And (3) spinning the obtained mixture on a glass sheet by using a spin coater at 6000rpm for 1min, and naturally curing the mixture in an environment with the relative humidity of 90% to obtain the rough porous substrate.

Soaking the prepared rough porous substrate into a 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane ethanol solution (the volume ratio of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane to ethanol is 1:99) to perform hydrophobic modification for 30min, drying to obtain a hydrophobic rough porous substrate, and pouring a perfluoropolyether lubricating liquid into the prepared hydrophobic rough porous substrate to obtain a smooth porous surface of the poured lubricating liquid.

Example 2

And spin-coating the obtained mixture on a metal substrate by a spin coater at 3000rpm for 30s, and naturally curing the mixture in an environment with the relative humidity of 90% to obtain the rough porous substrate.

Example 3

And (3) spinning the obtained mixture on a glass sheet by using a spin coater at 6000rpm for 1min, and naturally curing the mixture in an environment with the relative humidity of 80% to obtain the rough porous substrate.

Example 4

10g E51 epoxy resin and 1g diethylenetriamine were added to a beaker at the same time, and after stirring uniformly with a glass rod, the mixture was degassed by rotating the beaker at 6000rpm for 6 minutes by a centrifuge to prepare a mixture.

Example 5

Example 6

And pouring the obtained mixture on a metal substrate, scraping the mixture into a coating with uniform thickness by using a coating device, and naturally curing the coating in an environment with the relative humidity of 90% to obtain the rough porous substrate.

Example 7

And spraying the obtained mixture on a metal substrate by using a preheated spray gun, and naturally curing the mixture in an environment with the relative humidity of 90% to obtain the rough porous substrate.

Example 8

Spraying the obtained mixture on a metal substrate by using a preheated spray gun, and naturally curing the mixture in the environment with relative humidity of 60%, 70%, 80% and 90% respectively to obtain four rough porous substrates, namely a rough porous substrate prepared in the relative humidity of 60%, a rough porous substrate prepared in the relative humidity of 70%, a rough porous substrate prepared in the relative humidity of 80% and a rough porous substrate prepared in the relative humidity of 90%.

The roughened porous substrate prepared in the above relative humidity of 90% was examined, and the results are shown in fig. 2, in which a is a topography of the surface of the roughened porous substrate and B is a topography of the cross-section of the roughened porous substrate in fig. 2. As can be seen from fig. 2, porous rough substrates were produced using the production method of the present application.

Respectively soaking the four prepared rough porous substrates into a 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane ethanol solution (the volume ratio of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane to ethanol is 1:99) to perform hydrophobic modification for 30min, drying to obtain a hydrophobic rough porous substrate, and pouring a perfluoropolyether lubricating liquid into the prepared hydrophobic rough porous substrate to obtain four products, namely products 1-4, a smooth porous surface of a pouring lubricating liquid prepared in which the relative humidity is 60%, a smooth porous surface of a pouring liquid prepared in which the relative humidity is 70%, a smooth porous surface of a pouring liquid prepared in which the relative humidity is 80%, a product 3, and a product, Product 4 is a smooth porous surface impregnated with lubricating fluid prepared at a relative humidity of 90%.

Example 9

The performance of the surface of the product 1-4 prepared in example 8 is measured, and the method comprises the following steps:

this example measured the surface and cross-sectional topography of the rough porous substrate prepared in example 8 at a relative humidity of 60%, the rough porous substrate prepared in 70%, the rough porous substrate prepared in 80%, and the rough porous substrate prepared in 90%, and the results are shown in fig. 3-7, where fig. 3 is a statistical graph of the surface topography, pore size distribution, and porosity of the rough porous substrate prepared in example 8 of the present application at a relative humidity of 60%; FIG. 4 is a statistical plot of surface morphology, pore size distribution and porosity of a rough porous substrate prepared at a relative humidity of 70% as provided in example 8 of the present application; FIG. 5 is a statistical plot of surface morphology, pore size distribution and porosity of a rough porous substrate prepared at a relative humidity of 80% as provided in example 8 of the present application; FIG. 6 is a statistical plot of the surface topography, pore size distribution, and porosity of a rough porous substrate made in example 8 of the present application at a relative humidity of 90%. Fig. 7 is a statistical chart of the porosities of the rough porous substrate prepared in the relative humidity of 60%, the rough porous substrate prepared in the relative humidity of 70%, the rough porous substrate prepared in the relative humidity of 80%, and the rough porous substrate prepared in the relative humidity of 90%, provided in example 8 of the present application. It can be seen that the smooth porous surface of the rough porous substrate prepared in the relative humidity of 60%, the rough porous substrate prepared in the relative humidity of 70%, the rough porous substrate prepared in the relative humidity of 80%, and the rough porous substrate prepared in the relative humidity of 90% has a plurality of honeycomb-shaped micropores with uniform sizes distributed therein. The average pore size of the rough porous substrate prepared in the above example gradually increased from 4.09 μm to 4.47 μm, 4.48 μm and 5.09 μm as the ambient relative humidity gradually increased from 60% to 70%, 89% and 90%, and the porosity also gradually increased from 0.047% to 47%. The pore size distribution of the smooth porous surface of the perfusion lubricating liquid is different due to the change of the condensation quantity of water drops caused by the change of the environmental humidity.

Example 10

The adhesion performance of the epoxy resin and diethylenetriamine of example 8 of this application was determined by:

this example measured the adhesion test of the mixture of example 8 (i.e., a mixture of E51 epoxy resin and diethylenetriamine) to carbon steel.

The test method comprises the following steps: EP-SLIPS-attached samples and Eco-EP-attached samples were prepared.

The EP-SLIPS sample is prepared by mixing E51 epoxy resin and diethylenetriamine according to the mass ratio of 10:1, mixing, carrying out centrifugal degassing for 6min at the rotating speed of 6000rpm to obtain a uniform mixture, uniformly coating the mixture on the surface of carbon steel by a spray gun, curing the carbon steel for 2h under the environment that the relative humidity is 90 percent to obtain a rough porous substrate, and then soaking the prepared rough porous substrate into a 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane ethanol solution (the volume ratio of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane to ethanol is 1:99) to perform hydrophobic modification for 30min, drying to obtain a hydrophobic rough porous substrate, and pouring a perfluoropolyether lubricating liquid into the prepared hydrophobic rough porous substrate to obtain an EP-SLIPS sample.

The Eco-EP sample is a commercial curing agent (EP type epoxy resin curing agent, Guangdong Zhujiang chemical coating Co., Ltd.) matched with E44 epoxy resin, and the E51 epoxy resin are mixed according to the mass ratio of 1: 10, mixing, carrying out centrifugal degassing for 6min at the rotating speed of 6000rpm to obtain a uniform mixture, uniformly coating the mixture on the surface of carbon steel through a spray gun, and curing the carbon steel for 2h under the environment that the relative humidity is 90% to obtain an Eco-EP sample.

Respectively vertically hanging the test board adhered with the EP-SLIPS sample and the test board adhered with the Eco-EP sample on a test frame, hanging weights with specified weight on the upper ends of the EP-SLIPS sample and the Eco-EP sample, fixing the weights on the coating, and pulling the weights upwards by an adhesion tester at a certain speed until the coating is peeled off from the substrate, wherein the obtained force is the adhesion. Before and After refer to the topography Before and After the coating is stripped, respectively. Fig. 8 to 9 show statistics of the adhesion data of EP-SLIPS and Eco-EP provided in the embodiment of the present application, and fig. 9 shows an actual graph Before and After the adhesion test of EP-SLIPS provided in the embodiment of the present application (Before the adhesion test of EP-SLIPS is performed, Before beforee, and After the adhesion test of EP-SLIPS is performed, After). The results show that the adhesion of the mixture provided in the examples (i.e., the mixture of E51 epoxy resin and diethylenetriamine) on the surface of carbon steel is 2.31MPa and 2.29MPa, respectively, compared with the adhesion of the commercial curing epoxy resin, which indicates that the mixture provided in the examples (i.e., the mixture of E51 epoxy resin and diethylenetriamine) has better substrate adhesion.

Example 11

This example measured the anti-ice adhesion properties of product 4 of example 8, including:

preparing a sample:

the EP-SLIPS is that E51 epoxy resin and diethylenetriamine are mixed according to the mass ratio of 10:1, mixing, carrying out centrifugal degassing for 6min at the rotating speed of 6000rpm to obtain a uniform mixture, uniformly coating the mixture on the surface of carbon steel by a spray gun, curing the carbon steel for 2h under the environment that the relative humidity is 90 percent to obtain a rough porous substrate, and then soaking the prepared rough porous substrate into a 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane ethanol solution (the volume ratio of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane to ethanol is 1:99) to perform hydrophobic modification for 30min, drying to obtain a hydrophobic rough porous substrate, and pouring a perfluoropolyether lubricating liquid into the prepared hydrophobic rough porous substrate to obtain an EP-SLIPS sample.

The EP-BF is that the mass ratio of the E51 epoxy resin to the diethylenetriamine in the embodiment of the application is 10:1, mixing, carrying out centrifugal degassing for 6min at the rotating speed of 6000rpm to obtain a uniform mixture, uniformly coating the mixture on the surface of carbon steel through a spray gun, and curing the carbon steel for 2h under the environment that the relative humidity is 90% to obtain EP-BF.

EP-Modified is obtained by soaking the above EP-BF in an ethanol solution of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane (3,3,4,4,5,5,6,6,7,7,8,8,9,9,10, 10-heptadecafluorodecyltrimethoxysilane in a volume ratio of ethanol to ethanol of 1:99) to perform hydrophobic modification for 30min, and drying.

Glass is a Glass sheet.

Results as shown in fig. 10, fig. 10 is a graph of ice adhesion preventing data for various products provided in example 8 of the present application. The coating with ice adhesion below 50KPa is generally considered to have excellent anti-icing performance, and the ice adhesion of EP-SLIPS provided by the application example is 14.23KPa, which shows that the liquid pouring surface coating provided by the application example 8 has excellent anti-icing adhesion performance.

Comparative example 1

Comparative example 1 of the present application provides a comparative product comprising:

the preparation method of the comparative example is similar to that of example 1, except that a commercial curing agent (EP epoxy resin curing agent) matched with the E44 epoxy resin is used to replace diethylenetriamine, and the rest steps are the same as those of example 1, so as to obtain a comparative product, and the morphology of the comparative product is detected, and the result is shown in fig. 11. Fig. 11 a is an optical microscope image and B is an SEM image, showing that the coating obtained by curing with commercial curing agent matched with E44 epoxy resin has smooth and dense surface, no coarse porous structure, and no ultra-smooth liquid perfusion coating can be prepared.

To sum up, the present application solves the technical deficiencies in the prior art. The epoxy resin used in the invention has good adhesion to different substrates such as metal, glass and plastic, and stable mechanical properties, and can achieve the purpose of industrial application.

The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A method for preparing a rough substrate for a smooth porous surface impregnated with a lubricating fluid, comprising:

mixing epoxy resin and diethylenetriamine to prepare a mixture; the mass ratio of the epoxy resin to the diethylenetriamine is (5-12): 1; the epoxy resin is E-type epoxy resin; centrifugal degassing is also included after the mixing;

coating the mixture on a base material to prepare a composite base material;

2. The method according to claim 1, wherein the E-type epoxy resin has an average epoxy value of 0.01 to 0.55.

3. The method according to claim 1, wherein the centrifugal degassing has a centrifugal rotation speed of 1000 to 9000rpm and a centrifugal time of 60 to 600 seconds.

4. Rough substrate for smooth porous surfaces impregnated with lubricating fluid, characterized in that it comprises a rough substrate obtained by the process according to any one of claims 1 to 3.

5. The preparation method of the smooth porous surface infused with the lubricating liquid is characterized by comprising the following steps:

soaking the rough substrate in a hydrophobic modification liquid for hydrophobic modification, and drying to obtain a hydrophobic rough substrate, wherein the rough substrate is the rough substrate with the smooth porous surface for pouring the lubricating liquid, and the rough substrate is the rough substrate with the smooth porous surface for pouring the lubricating liquid, which is disclosed by claim 4;

6. The method according to claim 5, wherein the time for the hydrophobic modification is 30 to 120 min.

7. The method of claim 5, wherein the hydrophobic modifying solution has a solute selected from the group consisting of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10, 10-heptadecafluorodecyltrimethoxysilane, vinyltrichlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, phenylaminopropyltrimethoxysilane, gamma-isocyanatopropyltriethoxysilane, acryloxypropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane, gamma-glycidoxypropylmethyldiethoxysilane, gamma-glycidoxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane, gamma-glycidoxypropyltrimethoxysilane, water-soluble polymers, and mixtures thereof, One or more of gamma-mercaptopropyltrimethoxysilane, gamma-chloropropyltriethoxysilane and triethoxymethylsilane; the solvent of the hydrophobic modification liquid is ethanol; the volume ratio of the solute of the hydrophobic modification liquid to the solvent of the hydrophobic modification liquid is 1: (9-99).

8. The method of claim 5, wherein the low surface energy polymer is selected from one or more of perfluoropolyether oil, polydimethylsiloxane, liquid paraffin, and vegetable oil.

9. A lubricant-impregnated smooth porous surface comprising the lubricant-impregnated smooth porous surface prepared by the method according to any one of claims 5 to 8.