CN111234613A - Flexible transparent super-smooth pipeline inner wall coating for fluid transportation and preparation method thereof - Google Patents

Abstract

The invention discloses a fluid transport flexible transparent super-smooth pipeline inner wall coating and a preparation method thereof, relates to the technical field of super-smooth surface processing, and particularly relates to a fluid transport flexible transparent super-smooth pipeline inner wall coating and a preparation method thereof. The precursor of the coating is in a liquid phase, so that the inner wall of the pipeline can be conveniently coated, the framework is alginate, the framework is filled with the oleophobic liquid material, so that the coating is in a super-smooth structure, and the coating has the advantages of stain resistance and stability due to the characteristics of the traditional solid coating and the flexibility of the coating, so that the coating can be applied to a flexible pipe.

Description

A kind of flexible transparent ultra-smooth pipeline inner wall coating for fluid transport and preparation method thereof

technical field

The invention relates to the technical field of ultra-smooth surface processing, in particular to an inner wall coating of a flexible transparent ultra-smooth pipeline for fluid transport and a preparation method thereof.

Background technique

The inner wall of the liquid transportation pipeline will be rough and the diameter of the pipe will be reduced due to precipitation and adsorption, which greatly reduces the transportation efficiency. Especially when conveying greasy materials, the closure is highly susceptible to contamination and difficult to clean. Most of the current antifouling coatings use polytetrafluoroethylene as the main material, and the preparation methods are mostly suitable for the surface of the material, not suitable for the inner wall of a closed pipe, and the flexibility and light transmittance are not high.

The super-slippery structure was first proposed by the Aizenberg research group of Harvard University, which is a kind of Nepenthes-like structure and is made of slippery liquid infused porous materials. Since the traditional solid-liquid interface is replaced by a liquid-liquid interface, the droplets on the superslippery surface can slide with a small sliding angle, and their antifouling performance is excellent. However, the generally used porous solid-phase materials are not suitable for the preparation of pipeline inner wall coatings, and their bending resistance and light transmittance have certain limitations, which is not conducive to the layout of pipelines and the observation of the interior. Therefore, it is of great research significance and commercial value to design and prepare a flexible transparent ultra-slippery coating suitable for the inner wall of pipelines for transporting oils and fats.

SUMMARY OF THE INVENTION

The purpose of the invention is to provide a flexible transparent ultra-smooth pipeline inner wall coating for fluid transport and a preparation method thereof. The coating precursor is a liquid phase, which is convenient for coating the inner wall of the pipeline, and the coating has an ultra-slippery structure, which is anti-fouling and stable Due to the traditional solid state coating, the flexible characteristics of the coating can be applied to flexible pipes.

The present invention is a flexible transparent and ultra-smooth pipeline inner wall coating for fluid transport, comprising a porous skeleton, the skeleton is alginate whose cation is divalent, and the skeleton is filled with water or oleophobic/water liquid material.

Preferably, the porosity of the framework is 60%-90%.

Preferably, the size of the pores on the framework is 10nm-100um.

Preferably, the surface roughness of the coating is 10nm-50um.

Preferably, the light transmittance of the coating is 50%-100%.

Preferably, the oleophobic liquid is one of long-chain molecular alkanes or fluorine-containing organics or oils immiscible with the oil transported in the pipeline.

Preferably, the divalent cation alginate is at least one of calcium alginate, magnesium alginate, and barium alginate.

A method for preparing the inner wall coating of a flexible transparent ultra-smooth pipeline for fluid transport, comprising the following steps:

The first step is to coat the inner wall of the pipeline with monovalent cation alginate; inject the alginate aqueous solution with a mass concentration of 0.1%-10% monovalent cation into the pipeline, and the monovalent cation alginate aqueous solution is formed in the pipeline. A certain length of monovalent cation alginate aqueous solution liquid column, use a push tool to push the monovalent cation alginate aqueous solution liquid column in the pipeline to move at a uniform speed in one direction and discharge the pipeline, the monovalent cation alginate is sodium alginate or potassium alginate; the propelling tool is an air pump;

The second step is continuous cross-linking; the divalent cation aqueous solution with a mass concentration of 0.1%-10% is continuously injected into the pipe coated with the monovalent cation alginate, and cross-linked to form the divalent cation alginate coating ;

The third step is to clean the pipeline, and use the gas with a relative humidity of 0%-100% to discharge the divalent cation aqueous solution in the second step out of the pipeline, so as to obtain a flexible transparent ultra-smooth pipeline inner wall coating for fluid transportation;

When the skeleton needs to be filled with oleophobic/water liquid material, first remove the water in the skeleton of the flexible transparent ultra-smooth pipeline inner wall coating obtained in the third step, the specific methods include but are not limited to: evaporation, freeze-drying, etc., and then The oleophobic/water liquid material is filled into the framework, and specific methods include but are not limited to: vacuum infusion method, atmospheric immersion method, pressure injection method, solution exchange method, in-situ deposition method, etc.

Preferably, the moving speed of the alginate aqueous solution column of monovalent cations in the pipeline is 1 mm/s-1 m/s.

Preferably, the divalent cation is at least one of calcium ion, magnesium ion, and barium ion.

The precursor of the coating in the present invention is a liquid phase, which is convenient for coating the inner wall of the pipeline, the skeleton is a divalent alginate, and the oleophobic liquid material is filled in the skeleton, so that the coating has an ultra-slippery structure, and the anti-fouling and stability are better than those of traditional The solid-state coating and the flexible characteristics of the coating make the coating of the present invention applicable to flexible pipes, and the high light transmittance of the coating of the present invention facilitates observation of the internal fluid, or can perform photochemical reaction on the internal fluid.

In the preparation method of the coating of the present invention, the coating precursor flows through the pipe at a uniform speed, and then continuously cross-links, so that the present invention is more suitable for coating the inner wall of the pipe with negative curvature, and is especially suitable for micropipes.

Description of drawings

1 is a schematic diagram of a certain amount of sodium alginate aqueous solution injection pipeline in Example 1.

Fig. 2 is that the sodium alginate aqueous solution in Example 1 is covered with a layer of sodium alginate film.

3 is a pipeline covered with a sodium alginate membrane after the sodium alginate aqueous solution is completely discharged in Example 1.

Figure 4 shows the injection of calcium chloride aqueous solution into the pipeline covered with sodium alginate membrane in Example 1.

Figure 5 is a pipeline covered with a flexible transparent ultra-smooth pipeline inner wall coating after the calcium chloride aqueous solution is completely discharged in Example 1.

Reference signs: 1-pipeline; 2-sodium alginate aqueous solution; 3-air, 4-sodium alginate membrane, 5-divalent cation solution, 6-calcium alginate membrane in cross-linking, 7-flexible transparent ultra-slip Pipe inner wall coating.

Detailed ways

The present invention is a flexible transparent ultra-smooth pipeline inner wall coating for fluid transport, comprising a porous skeleton, the skeleton is a divalent cation alginate, and the skeleton is filled with water or oleophobic/water liquid material.

The porosity of the framework is 60%-90%.

The size of the pores on the backbone is 10nm-100um.

The surface roughness of the coating is 10nm-50um.

The transmittance of the coating is 50%-100%.

The oleophobic liquid is one of long-chain molecular alkanes such as octadecane-tetracosane or fluorine-containing organics or oils that are immiscible with the transporter.

The divalent cation alginate is a kind of sodium alginate and potassium alginate.

A method for preparing the inner wall coating of a flexible transparent ultra-smooth pipeline for fluid transport, comprising the following steps:

The first step is to coat the alginate on the inner wall of the pipeline; inject the alginate aqueous solution with a mass concentration of 0.1%-10% into the pipeline 1, and the alginate aqueous solution forms a certain length of the alginate aqueous solution liquid column in the pipeline 1 , use the push tool to push the alginate aqueous solution column in the pipeline 1 to move at a uniform speed in one direction and discharge the pipeline 1, and the push tool is an air pump; the alginate of monovalent cation is sodium alginate or potassium alginate;

The second step is continuous cross-linking; the divalent cation solution with a mass concentration of 0.1%-10% is continuously injected into the pipeline 1 coated with the monovalent cation alginate, and the alginate coating of the divalent cation is formed by cross-linking. layer, the skeletal filler of the alginate coating is water;

In the third step, the pipeline 1 is cleaned, and the divalent cation aqueous solution in the second step is discharged from the pipeline 1 using a gas with a relative humidity of 0%-100%, so as to obtain a flexible transparent ultra-smooth pipeline inner wall coating 7 for fluid transportation. ;

When the skeleton needs to be filled with oleophobic/water liquid materials, first remove the water in the skeleton of the flexible transparent ultra-smooth pipeline inner wall coating obtained in the third step, the specific methods include but are not limited to: evaporation, freeze-drying, etc., and then The oleophobic/water liquid material is filled into the framework, and specific methods include but are not limited to: vacuum infusion method, atmospheric immersion method, pressure injection method, solution exchange method, in-situ deposition method, etc.

The moving speed of the monovalent cation alginate aqueous solution column in the pipeline 1 is 1 mm/s-1 m/s.

The divalent cation is at least one of calcium ion, magnesium ion, and barium ion.

Example 1

As shown in Figure 1 and Figure 2, 5mL of 1% sodium alginate aqueous solution 2 is injected into a silica gel tube with an inner diameter of 3 mm through a microfluidic pump to form a sodium alginate aqueous solution 2 liquid column, and the left side of the pipeline 1 is alginic acid Sodium aqueous solution 2, the right side is air 3, as shown in Figure 3, use the air pump to push the alginate aqueous solution column to move at a uniform speed in one direction and discharge the pipeline 1, the moving speed is 2mm/min, and push the air of the alginate aqueous solution column. 3. The humidity at room temperature of 25 degrees Celsius is 50%, and the left inner wall of the pipeline 1 is the sodium alginate film 44 formed by the sodium alginate aqueous solution 2 flowing through the inner wall of the pipeline; as shown in FIG. The calcium alginate aqueous solution 5 is continuously injected into the pipeline 1 coated with sodium alginate at a flow rate of 1 mL/min for 10 minutes, and the calcium alginate film 6 in the cross-linking is formed on the left side of the pipeline 1; as shown in Figure 5, using The air 3 with a humidity of 50% at a room temperature of 25 degrees Celsius discharges the calcium chloride aqueous solution 5 out of the pipeline 1, and the flexible transparent and ultra-smooth pipeline inner wall coating 7 can be obtained.

The precursor of the coating in the present invention is a liquid phase, which is convenient for coating the inner wall of the pipeline, the skeleton is alginate, and the oleophobic liquid material is filled in the skeleton, so that the coating has an ultra-slippery structure, and the anti-fouling and stability are due to the traditional solid coating. , the flexibility of the coating enables the coating of the present invention to be applied to flexible pipes, and the high light transmittance of the coating of the present invention facilitates observation of the internal fluid, or can perform photochemical reactions on the internal fluid.

In the preparation method of the coating of the present invention, the coating precursor flows through the pipe 1 at a constant speed, and then continuously cross-links, so that the present invention is more suitable for the coating of the inner wall of the tube with negative curvature, and is especially suitable for the micro tube.

Claims (10)

1. The utility model provides a flexible transparent super smooth pipeline inner wall coating of fluid transportation which characterized in that, includes porous skeleton, the skeleton is divalent cation's alginate, fills water or oleophobic/aqueous liquid material in the skeleton.

2. The coating for an inner wall of a flexible, transparent, ultra-smooth conduit for fluid transport of claim 1, wherein said skeleton has a porosity of 60% to 90%.

3. The coating for inner wall of flexible transparent ultra-smooth pipe for transporting fluid of claim 2, wherein the size of the pores on the skeleton is 10nm-100 um.

4. The coating for the inner wall of a flexible, transparent and ultra-smooth pipe for transporting a fluid according to claim 3, wherein the surface roughness of the coating is 10nm to 50 um.

5. The coating for an inner wall of a flexible, transparent, ultra-smooth conduit for transporting fluids according to claim 4, wherein said coating has a light transmittance of 50% to 100%.

6. The coating for the inner wall of a flexible, transparent and ultra-smooth pipeline for fluid transport according to claim 1, wherein the oleophobic liquid is a long-chain molecular alkane or a fluorine-containing organic substance.

7. The coating of claim 6, wherein the alginate of divalent cations is at least one of calcium alginate, magnesium alginate and barium alginate.

8. The method for preparing the coating on the inner wall of the flexible transparent ultra-smooth pipeline for fluid transportation according to any one of claims 1 to 7, which comprises the following steps:

firstly, coating alginate of univalent cations on the inner wall of a pipeline; injecting an alginate aqueous solution with mass concentration of 0.1-10% of univalent cation into a pipeline, wherein the alginate aqueous solution of univalent cation forms a certain length of univalent cation alginate aqueous solution liquid column in the pipeline, and pushing the univalent cation alginate aqueous solution liquid column in the pipeline to move unidirectionally at a constant speed by using a pushing tool and discharge the univalent cation alginate aqueous solution liquid column out of the pipeline;

step two, continuous crosslinking; continuously injecting a divalent cation aqueous solution with the mass concentration of 0.1-10% into a pipeline coated with monovalent cation alginate, and crosslinking to form the divalent cation alginate coating;

thirdly, cleaning the pipeline, and discharging the divalent cation aqueous solution in the second step out of the pipeline by using gas with the relative humidity of 0-100 percent to obtain the inner wall coating of the flexible transparent ultra-smooth pipeline for fluid transportation;

when the skeleton needs to be filled with the oleophobic/water liquid material, water in the skeleton of the inner wall coating of the flexible transparent ultra-smooth pipeline prepared in the third step is removed, and then the oleophobic/water liquid material is filled into the skeleton.

9. The method of claim 8, wherein the liquid column of the monovalent cation alginate solution is moved at a speed of 1mm/s to 1 m/s.

10. The method of claim 9, wherein the divalent cations are at least one of calcium, magnesium, and barium.

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