CN111234613A - Flexible transparent super-smooth pipeline inner wall coating for fluid transportation and preparation method thereof - Google Patents
Flexible transparent super-smooth pipeline inner wall coating for fluid transportation and preparation method thereof Download PDFInfo
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- CN111234613A CN111234613A CN202010176299.1A CN202010176299A CN111234613A CN 111234613 A CN111234613 A CN 111234613A CN 202010176299 A CN202010176299 A CN 202010176299A CN 111234613 A CN111234613 A CN 111234613A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D105/00—Coating compositions based on polysaccharides or on their derivatives, not provided for in groups C09D101/00 or C09D103/00
- C09D105/04—Alginic acid; Derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
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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
Technical Field
The invention relates to the technical field of ultra-smooth surface processing, in particular to a coating on the inner wall of a flexible transparent ultra-smooth pipeline for fluid transportation and a preparation method thereof.
Background
The inner wall of the liquid transportation pipeline can cause the roughness of the pipe wall and the reduction of the pipe diameter due to the reasons of precipitation, adsorption and the like, and the transportation efficiency is reduced to a great extent. In particular when transporting greasy materials, the closure is very easily contaminated and difficult to clean. The existing anti-fouling coating mostly uses polytetrafluoroethylene as a main material, and the preparation method is mostly suitable for the surface of the material, is not suitable for the inner wall of a closed pipeline, and has low flexibility and light transmittance.
The ultra-smooth structure is formed by pouring porous materials into easy-to-slide liquid, and is provided for the first time by Aizenberg subject group of Harvard university. Since the conventional solid-liquid interface is replaced by a liquid-liquid interface, the liquid droplets on the ultra-smooth surface can slide at a small sliding angle, and the anti-fouling performance is excellent. However, the preparation process of the commonly used porous solid phase material is not suitable for manufacturing the inner wall coating of the pipeline, and the bending resistance and the light transmittance of the material are limited to a certain extent, which is not beneficial to the arrangement of the pipeline and the observation of the interior. Therefore, the flexible transparent super-smooth coating for conveying the grease and the like, which is suitable for the inner wall of the pipeline, is designed and prepared, and has very important research significance and commercial value.
Disclosure of Invention
The invention aims to provide a flexible transparent ultra-smooth pipeline inner wall coating for fluid transportation and a preparation method thereof.
The invention relates to a flexible transparent ultra-smooth pipeline inner wall coating for fluid transportation, which comprises a porous framework, wherein the framework is alginate with divalent cations, and water or oleophobic/water liquid materials are filled in the framework.
Preferably, the porosity of the skeleton is 60% to 90%.
Preferably, the size of the pores on the backbone is 10nm-100 um.
Preferably, the coating surface roughness is 10nm-50 um.
Preferably, the coating has a light transmittance of 50% to 100%.
Preferably, the oleophobic liquid is one of long-chain molecular alkane or fluorine-containing organic matter or oil which is insoluble with oil transported in the pipeline.
Preferably, the alginate of the divalent cation is at least one of calcium alginate, magnesium alginate and barium alginate.
A preparation method of a coating on the inner wall of a flexible transparent ultra-smooth pipeline for fluid transportation 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 univalent cation alginate aqueous solution liquid column with a certain length in the pipeline, 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 discharging the univalent cation alginate aqueous solution liquid column out of the pipeline, wherein the univalent cation alginate is sodium alginate or potassium alginate; the pushing tool is an air pump;
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 an oleophobic/aqueous liquid material, firstly removing the water in the skeleton of the inner wall coating of the flexible transparent ultra-smooth pipeline prepared in the third step, wherein the specific method comprises but is not limited to: such as evaporation, lyophilization, and the like, and then filling the oleophobic/aqueous liquid material into the matrix, specific methods include, but are not limited to: vacuum infusion, atmospheric pressure immersion, pressure injection, solution exchange, in situ deposition, and the like.
Preferably, the moving speed of the liquid column of the alginate aqueous solution with the univalent cations in the pipeline is 1mm/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 is in a liquid phase, so that the inner wall of the pipeline can be conveniently coated, the framework is divalent alginate, the framework is filled with the oleophobic liquid material, so that the coating is in a super-smooth structure, the anti-fouling and stability of the coating are superior to those of the traditional solid coating, and the coating can be applied to a flexible pipe due to the flexible characteristic of the coating.
The preparation method of the coating provided by the invention has the advantages that the precursor of the coating flows through the pipeline at a constant speed and then is continuously crosslinked, so that the coating is more suitable for coating the inner wall of the pipe with negative curvature, and is particularly suitable for a microtube.
Drawings
FIG. 1 is a diagram illustrating a certain amount of sodium alginate aqueous solution injection pipeline in the first embodiment.
FIG. 2 shows an embodiment in which the sodium alginate aqueous solution flow area is covered with a film of sodium alginate.
FIG. 3 shows a pipe coated with a sodium alginate film after the aqueous solution of sodium alginate is completely discharged in the first embodiment.
FIG. 4 is a schematic view showing the pipe covered with the sodium alginate membrane in the first embodiment, in which an aqueous solution of calcium chloride is injected.
FIG. 5 is a view showing the pipe coated with the inner wall coating of the flexible transparent ultra-smooth pipe after the calcium chloride aqueous solution is completely discharged in the first embodiment.
Reference numerals: 1-a pipeline; 2-sodium alginate aqueous solution; 3-air, 4-sodium alginate membrane, 5-divalent cation solution, 6-calcium alginate membrane in cross linking, and 7-flexible transparent super-smooth inner wall coating of the pipeline.
Detailed Description
The invention relates to a flexible transparent ultra-smooth pipeline inner wall coating for fluid transportation, which comprises a porous framework, wherein the framework is alginate of divalent cations, and water or oleophobic/water liquid materials are filled in the framework.
The porosity of the framework is 60-90%.
The size of the pores on the skeleton is 10nm-100 um.
The surface roughness of the coating is 10nm-50 um.
The light transmittance of the coating is 50-100%.
The oleophobic liquid is long-chain paraffin such as octadecane-tetracosane or fluorine-containing organic matter or oil immiscible with transported matter.
The alginate of divalent cation is one of sodium alginate and potassium alginate.
A preparation method of a coating on the inner wall of a flexible transparent ultra-smooth pipeline for fluid transportation comprises the following steps:
firstly, coating alginate on the inner wall of a pipeline; injecting an alginate aqueous solution with the mass concentration of 0.1-10% into the pipeline 1, wherein the alginate aqueous solution forms an alginate aqueous solution liquid column with a certain length in the pipeline 1, pushing the alginate aqueous solution liquid column in the pipeline 1 to move unidirectionally at a constant speed by using a pushing tool, and discharging the alginate aqueous solution liquid column out of the pipeline 1, wherein the pushing tool is an air pump; the alginate of univalent cation is sodium alginate or potassium alginate;
step two, continuous crosslinking; continuously injecting a divalent cation solution with the mass concentration of 0.1-10% into a pipeline 1 coated with monovalent cation alginate, and crosslinking to form an alginate coating of the divalent cation, wherein the skeleton filler of the alginate coating is water;
thirdly, cleaning the pipeline 1, and discharging the divalent cation aqueous solution in the second step out of the pipeline 1 by using gas with the relative humidity of 0-100 percent to obtain a flexible transparent ultra-smooth pipeline inner wall coating 7 for fluid transportation;
when the skeleton needs to be filled with an oleophobic/aqueous liquid material, firstly removing the water in the skeleton of the inner wall coating of the flexible transparent ultra-smooth pipeline prepared in the third step, wherein the specific method comprises but is not limited to: such as evaporation, lyophilization, and the like, and then filling the oleophobic/aqueous liquid material into the matrix, specific methods include, but are not limited to: vacuum infusion, atmospheric pressure immersion, pressure injection, solution exchange, in situ deposition, and the like.
The moving speed of the liquid column of the alginate aqueous solution of univalent cations in the pipeline 1 is 1mm/s-1 m/s.
The divalent cation is at least one of calcium ion, magnesium ion and barium ion.
Example one
As shown in fig. 1 and 2, 5mL of sodium alginate aqueous solution 2 with mass concentration of 1% is injected into a silica gel tube with inner diameter of 3mm through a micro-flow pump to form a sodium alginate aqueous solution 2 liquid column, the left side in the pipeline 1 is the sodium alginate aqueous solution 2, and the right side in the pipeline 1 is air 3, as shown in fig. 3, an air pump is utilized to push the alginate aqueous solution liquid column to move unidirectionally at a uniform speed and discharge the alginate aqueous solution liquid column out of the pipeline 1, the moving speed is 2mm/min, the humidity of the air 3 for pushing the alginate aqueous solution liquid column at room temperature of 25 ℃ is 50%, and a sodium alginate membrane 44 formed by the sodium alginate aqueous solution 2 flowing through the inner; as shown in fig. 4, a calcium chloride aqueous solution 5 with a mass concentration of 1% is continuously injected into the pipe 1 coated with sodium alginate at a flow rate of 1mL/min for 10 minutes, and a cross-linked calcium alginate membrane 6 is formed on the left side in the pipe 1; as shown in fig. 5, the calcium chloride aqueous solution 5 is discharged out of the pipeline 1 by using air 3 with a humidity of 50% at a room temperature of 25 ℃, so as to obtain the flexible transparent ultra-smooth pipeline inner wall coating 7.
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.
The preparation method of the coating provided by the invention enables the precursor of the coating to flow through the pipeline 1 at a constant speed and then carry out continuous crosslinking, so that the coating is more suitable for coating the inner wall of the pipe with negative curvature, and is particularly suitable for a microtube.
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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| Application Number | Priority Date | Filing Date | Title |
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| CN202010176299.1A CN111234613A (en) | 2020-03-13 | 2020-03-13 | Flexible transparent super-smooth pipeline inner wall coating for fluid transportation and preparation method thereof |
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| CN202010176299.1A CN111234613A (en) | 2020-03-13 | 2020-03-13 | Flexible transparent super-smooth pipeline inner wall coating for fluid transportation and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112961544A (en) * | 2021-03-09 | 2021-06-15 | 西北大学 | Oil gel coating for water delivery drag reduction and pollution resistance and preparation method thereof |
| CN112973815A (en) * | 2021-03-09 | 2021-06-18 | 西北大学 | Microflow pipeline for collecting non-spherical micro-swimming bodies and filtering method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112961544A (en) * | 2021-03-09 | 2021-06-15 | 西北大学 | Oil gel coating for water delivery drag reduction and pollution resistance and preparation method thereof |
| CN112973815A (en) * | 2021-03-09 | 2021-06-18 | 西北大学 | Microflow pipeline for collecting non-spherical micro-swimming bodies and filtering method |
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Application publication date: 20200605 |