CN111718624A - Harmless pipeline corrosion prevention method - Google Patents
Harmless pipeline corrosion prevention method Download PDFInfo
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- CN111718624A CN111718624A CN202010531926.9A CN202010531926A CN111718624A CN 111718624 A CN111718624 A CN 111718624A CN 202010531926 A CN202010531926 A CN 202010531926A CN 111718624 A CN111718624 A CN 111718624A
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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
- C09D131/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Coating compositions based on derivatives of such polymers
- C09D131/02—Homopolymers or copolymers of esters of monocarboxylic acids
- C09D131/04—Homopolymers or copolymers of vinyl acetate
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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
- C09D5/08—Anti-corrosive paints
-
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The invention relates to a harmless pipeline corrosion prevention method, which comprises the following steps: scraping the inner and outer surfaces of the pipe with steel wire balls to remove impurities on the inner and outer surfaces; washing the inner and outer surfaces of the pipeline with clean water; drying the inner surface and the outer surface; coating a layer of anticorrosive paint on the inner surface and the outer surface of the natural gas pipeline, naturally coating a layer of anticorrosive paint, and naturally drying; the anticorrosive paint comprises the following raw materials in parts by weight: 40-45 parts of polyvinyl acetate emulsion, 35-37 parts of polyvinyl chloride resin, 6-8 parts of modified peanut shell powder, 3-5 parts of sodium methyl silicate, 3-5 parts of epoxy octyl stearate, 0.5-1 part of sepiolite powder, 1-3 parts of superfine mica powder, 0.5-1 part of nano boron nitride, 0.5-1 part of hollow glass microsphere, 0.5-1 part of tetramethyl thiuram dithionate and 4-6 parts of cottonseed oil. The paint has good corrosion resistance, strong binding power and difficult shedding through the synergistic effect of the raw materials.
Description
Technical Field
The invention relates to the field of pipeline corrosion prevention, in particular to a harmless pipeline corrosion prevention method.
Background
A pipe is a device for transporting a gas, a liquid or a fluid with solid particles. The use of pipelines is very widespread, mainly in water supply, drainage, heating, gas supply, long-distance oil and gas delivery, agricultural irrigation, hydraulic engineering and various industrial installations.
An important problem encountered in the use process of pipelines is corrosion prevention, and the corrosion prevention of the coating of the current paint proves to be the most effective, economic and most common method for application, but most of the existing corrosion prevention paints have poor corrosion prevention effect.
Disclosure of Invention
The invention aims to: the harmless pipeline corrosion prevention method is provided, and the corrosion prevention effect of the corrosion prevention coating used in the corrosion prevention method is good.
In order to achieve the above purpose, the invention provides the following technical scheme:
a harmless pipeline corrosion prevention method is characterized by comprising the following steps: the method comprises the following steps:
s1: scraping the inner and outer surfaces of the pipe with steel wire balls to remove impurities on the inner and outer surfaces;
s2: washing the inner and outer surfaces of the pipeline with clean water;
s3: drying the inner surface and the outer surface;
s4: coating a layer of anticorrosive paint on the inner surface and the outer surface of the natural gas pipeline, naturally standing for 25-35min, coating a layer of anticorrosive paint, and naturally drying;
the anticorrosive paint comprises the following raw materials in parts by weight:
40-45 parts of polyvinyl acetate emulsion, 35-37 parts of polyvinyl chloride resin, 6-8 parts of modified peanut shell powder, 3-5 parts of sodium methyl silicate, 3-5 parts of epoxy octyl stearate, 0.5-1 part of sepiolite powder, 1-3 parts of superfine mica powder, 0.5-1 part of nano boron nitride, 0.5-1 part of hollow glass microsphere, 0.5-1 part of tetramethyl thiuram dithionate and 4-6 parts of cottonseed oil.
Further, the preparation method of the modified peanut shells in the anticorrosive paint comprises the following steps: cleaning peanut shells, then placing the cleaned peanut shells into an oven for drying, placing the dried peanut shells into a pulverizer for pulverizing, placing the obtained peanut powder into a muffle furnace, heating to 250-plus-one temperature of 300 ℃ at a heating rate of 10-15 ℃/min under the protection of nitrogen, carrying out heat preservation carbonization for 10-20min, then heating to 350-plus-one temperature of 400 ℃ at a heating rate of 10-15 ℃/min, carrying out heat preservation carbonization for 8-15min, finally heating to 450-plus-one temperature of 500 ℃ at a heating rate of 10-15 ℃/min, and carrying out heat preservation carbonization for 8-15min to obtain the modified peanut shells.
Further, the preparation method of the anticorrosive paint comprises the following steps:
(1) heating the polyvinyl acetate emulsion to 60-70 ℃, adding sepiolite powder, superfine mica powder, nano boron nitride and hollow glass beads, and stirring at a constant temperature to obtain a mixture A;
(2) heating the polyvinyl chloride resin to be fully melted, adding the modified peanut shell powder, and stirring while keeping the temperature to obtain a mixture B;
(3) and mixing the mixture A and the mixture B, uniformly stirring, adding sodium methyl silicate, epoxy octyl stearate, tetramethyl thiuram dithionate and cottonseed oil, keeping the temperature at 90-100 ℃, stirring, and naturally cooling to room temperature.
Further, the stirring time in the step (1) is 30-40 min.
Further, the stirring time in the step (2) is 30-40 min.
Further, the heat preservation and stirring time in the step (3) is 20-30 min.
Further, the specific process of drying in step S3 is as follows: blowing with hot air at 70-80 deg.C for 10-20 min.
Further, the specific process of drying in step S3 is as follows: hot air at 75 ℃ was used to blow the mixture for 15 minutes.
Furthermore, the thickness of the dried anticorrosive paint is 0.1-0.5 mm.
The invention has the beneficial effects that:
the acrylic resin emulsion and the polyvinyl acetate emulsion selected by the anticorrosive coating have good waterproofness and corrosion resistance, the compactness, scratch resistance, corrosion resistance and stability of the coating are enhanced by filling the sepiolite powder, the superfine mica powder, the nano boron nitride and the hollow glass beads, the plasticizing and bonding capacity of the material can be enhanced by the cottonseed oil, the film forming property and the corrosion resistance of the coating can be improved by adding the modified peanut shell powder, the corrosion and falling of the coating are inhibited, and the protective effect of the coating on a pipeline is improved. In summary, the following steps: the coating has good corrosion resistance through the synergistic effect of the raw materials, and meanwhile, the coating has strong binding power and is not easy to fall off.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example 1
A harmless pipeline corrosion prevention method is characterized by comprising the following steps: the method comprises the following steps:
s1: scraping the inner and outer surfaces of the pipe with steel wire balls to remove impurities on the inner and outer surfaces;
s2: washing the inner and outer surfaces of the pipeline with clean water;
s3: drying the inner surface and the outer surface; the specific process of drying: blowing with hot wind at 70 deg.c for 10-20 min.
S4: coating a layer of anticorrosive paint on the inner surface and the outer surface of the natural gas pipeline, naturally standing for 25min, coating a layer of anticorrosive paint, and naturally drying; the thickness of the dried anticorrosive paint is 0.1-0.5 mm.
The anticorrosive paint comprises the following raw materials in parts by weight:
40 parts of polyvinyl acetate emulsion, 35 parts of polyvinyl chloride resin, 6 parts of modified peanut shell powder, 3 parts of sodium methyl silicate, 3 parts of epoxy octyl stearate, 0.5 part of sepiolite powder, 1 part of superfine mica powder, 0.5 part of nano boron nitride, 0.5 part of hollow glass microsphere, 0.5 part of tetramethyl thiuram dithionate and 4 parts of cottonseed oil.
The preparation method of the modified peanut shell comprises the following steps: cleaning peanut shells, then placing the cleaned peanut shells into an oven for drying, placing the dried peanut shells into a grinder for grinding, placing the obtained peanut powder into a muffle furnace, heating to 250 ℃ at a heating rate of 10 ℃/min under the protection of nitrogen, preserving heat for carbonization for 20min, then heating to 350 ℃ at a heating rate of 10 ℃/min, preserving heat for carbonization for 15min, finally heating to 450 ℃ at a heating rate of 10 ℃/min, preserving heat for carbonization for 15min, and obtaining the modified peanut shells.
The preparation method of the anticorrosive paint comprises the following steps:
(1) heating the polyvinyl acetate emulsion to 60 ℃, adding sepiolite powder, superfine mica powder, nano boron nitride and hollow glass beads, and stirring for 30min under heat preservation to obtain a mixture A;
(2) heating the polyvinyl chloride resin to be fully melted, adding the modified peanut shell powder, and stirring for 30min under the condition of heat preservation to obtain a mixture B;
(3) and mixing the mixture A and the mixture B, uniformly stirring, adding sodium methyl silicate, epoxy octyl stearate, tetramethyl thiuram dithionate and cottonseed oil, keeping the temperature at 90 ℃, stirring for 20min, and naturally cooling to room temperature.
Example 2
A harmless pipeline corrosion prevention method is characterized by comprising the following steps: the method comprises the following steps:
s1: scraping the inner and outer surfaces of the pipe with steel wire balls to remove impurities on the inner and outer surfaces;
s2: washing the inner and outer surfaces of the pipeline with clean water;
s3: drying the inner surface and the outer surface; the specific process of drying: blowing with hot air at 75 deg.C for 10-20 min.
S4: coating a layer of anticorrosive paint on the inner surface and the outer surface of the natural gas pipeline, naturally standing for 30min, coating a layer of anticorrosive paint, and naturally drying; the thickness of the dried anticorrosive paint is 0.1-0.5 mm.
The anticorrosive paint comprises the following raw materials in parts by weight:
42 parts of polyvinyl acetate emulsion, 36 parts of polyvinyl chloride resin, 7 parts of modified peanut shell powder, 4 parts of sodium methyl silicate, 4 parts of epoxy octyl stearate, 0.8 part of sepiolite powder, 2 parts of superfine mica powder, 0.8 part of nano boron nitride, 0.7 part of hollow glass microsphere, 0.8 part of tetramethyl thiuram dithionate and 5 parts of cottonseed oil.
The preparation method of the modified peanut shell comprises the following steps: cleaning peanut shells, then placing the cleaned peanut shells into an oven for drying, placing the dried peanut shells into a grinder for grinding, placing the obtained peanut powder into a muffle furnace, heating to 280 ℃ at a heating rate of 12 ℃/min under the protection of nitrogen, preserving heat for carbonization for 15min, then heating to 380 ℃ at a heating rate of 12 ℃/min, preserving heat for carbonization for 12min, finally heating to 480 ℃ at a heating rate of 12 ℃/min, preserving heat for carbonization for 12min, and obtaining the modified peanut shells.
The preparation method of the anticorrosive paint comprises the following steps:
(1) heating the polyvinyl acetate emulsion to 65 ℃, adding sepiolite powder, superfine mica powder, nano boron nitride and hollow glass beads, and stirring for 35min while keeping the temperature to obtain a mixture A;
(2) heating the polyvinyl chloride resin to be fully melted, adding the modified peanut shell powder, and stirring for 35min under the condition of heat preservation to obtain a mixture B;
(3) and mixing the mixture A and the mixture B, uniformly stirring, adding sodium methyl silicate, epoxy octyl stearate, tetramethyl thiuram dithionate and cottonseed oil, stirring at the temperature of 95 ℃ for 25min, and naturally cooling to room temperature.
Example 3
A harmless pipeline corrosion prevention method is characterized by comprising the following steps: the method comprises the following steps:
s1: scraping the inner and outer surfaces of the pipe with steel wire balls to remove impurities on the inner and outer surfaces;
s2: washing the inner and outer surfaces of the pipeline with clean water;
s3: drying the inner surface and the outer surface; the specific process of drying: hot air at 80 ℃ was used for 10 minutes.
S4: coating a layer of anticorrosive paint on the inner surface and the outer surface of the natural gas pipeline, naturally standing for 35min, coating a layer of anticorrosive paint, and naturally drying; the thickness of the dried anticorrosive paint is 0.1-0.5 mm.
The anticorrosive paint comprises the following raw materials in parts by weight:
45 parts of polyvinyl acetate emulsion, 37 parts of polyvinyl chloride resin, 8 parts of modified peanut shell powder, 5 parts of sodium methyl silicate, 5 parts of octyl epoxy stearate, 1 part of sepiolite powder, 3 parts of superfine mica powder, 1 part of nano boron nitride, 1 part of hollow glass microsphere, 1 part of tetramethyl thiuram dithionate and 6 parts of cottonseed oil.
The preparation method of the modified peanut shell comprises the following steps: cleaning peanut shells, then placing the cleaned peanut shells into an oven for drying, placing the dried peanut shells into a grinder for grinding, placing the obtained peanut powder into a muffle furnace, heating to 300 ℃ at a heating rate of 15 ℃/min under the protection of nitrogen, preserving heat for carbonization for 10min, then heating to 400 ℃ at a heating rate of 15 ℃/min, preserving heat for carbonization for 8min, finally heating to 500 ℃ at a heating rate of 15 ℃/min, preserving heat for carbonization for 8min, and obtaining the modified peanut shells.
The preparation method of the anticorrosive paint comprises the following steps:
(1) heating the polyvinyl acetate emulsion to 70 ℃, adding sepiolite powder, superfine mica powder, nano boron nitride and hollow glass beads, and stirring for 40min under heat preservation to obtain a mixture A;
(2) heating the polyvinyl chloride resin to be fully melted, adding the modified peanut shell powder, and stirring for 40min under heat preservation to obtain a mixture B;
(3) and mixing the mixture A and the mixture B, uniformly stirring, adding sodium methyl silicate, epoxy octyl stearate, tetramethyl thiuram dithionate and cottonseed oil, keeping the temperature at 100 ℃, stirring for 20min, and naturally cooling to room temperature.
Comparative example 1
A harmless pipeline corrosion prevention method is characterized by comprising the following steps: the method comprises the following steps:
s1: scraping the inner and outer surfaces of the pipe with steel wire balls to remove impurities on the inner and outer surfaces;
s2: washing the inner and outer surfaces of the pipeline with clean water;
s3: drying the inner surface and the outer surface; the specific process of drying: hot air at 80 ℃ was used for 10 minutes.
S4: coating a layer of anticorrosive paint on the inner surface and the outer surface of the natural gas pipeline, naturally standing for 35min, coating a layer of anticorrosive paint, and naturally drying; the thickness of the dried anticorrosive paint is 0.1-0.5 mm.
The anticorrosive paint comprises the following raw materials in parts by weight:
45 parts of polyvinyl acetate emulsion, 37 parts of polyvinyl chloride resin, 8 parts of modified peanut shell powder, 5 parts of sodium methyl silicate, 5 parts of epoxy octyl stearate, 1 part of tetramethyl thiuram dithionate and 6 parts of cottonseed oil.
The preparation method of the modified peanut shell comprises the following steps: cleaning peanut shells, then placing the cleaned peanut shells into an oven for drying, placing the dried peanut shells into a grinder for grinding, placing the obtained peanut powder into a muffle furnace, heating to 300 ℃ at a heating rate of 15 ℃/min under the protection of nitrogen, preserving heat for carbonization for 10min, then heating to 400 ℃ at a heating rate of 15 ℃/min, preserving heat for carbonization for 8min, finally heating to 500 ℃ at a heating rate of 15 ℃/min, preserving heat for carbonization for 8min, and obtaining the modified peanut shells.
The preparation method of the anticorrosive paint comprises the following steps:
(1) heating the polyvinyl acetate emulsion to 70 ℃ to obtain a material A;
(2) heating the polyvinyl chloride resin to be fully melted, adding the modified peanut shell powder, and stirring for 40min under heat preservation to obtain a mixture B;
(3) and mixing the material A and the mixture B, uniformly stirring, adding sodium methyl silicate, epoxy octyl stearate, tetramethyl thiuram dithionate and cottonseed oil, keeping the temperature at 100 ℃, stirring for 20min, and naturally cooling to room temperature.
Comparative example 2
A harmless pipeline corrosion prevention method is characterized by comprising the following steps: the method comprises the following steps:
s1: scraping the inner and outer surfaces of the pipe with steel wire balls to remove impurities on the inner and outer surfaces;
s2: washing the inner and outer surfaces of the pipeline with clean water;
s3: drying the inner surface and the outer surface; the specific process of drying: hot air at 80 ℃ was used for 10 minutes.
S4: coating a layer of anticorrosive paint on the inner surface and the outer surface of the natural gas pipeline, naturally standing for 35min, coating a layer of anticorrosive paint, and naturally drying; the thickness of the dried anticorrosive paint is 0.1-0.5 mm.
The anticorrosive paint comprises the following raw materials in parts by weight:
45 parts of polyvinyl acetate emulsion, 37 parts of polyvinyl chloride resin, 5 parts of sodium methyl silicate, 5 parts of epoxy octyl stearate, 1 part of sepiolite powder, 3 parts of superfine mica powder, 1 part of nano boron nitride, 1 part of hollow glass microsphere, 1 part of tetramethyl thiuram disulfide and 6 parts of cottonseed oil.
The preparation method of the anticorrosive paint comprises the following steps:
(1) heating the polyvinyl acetate emulsion to 70 ℃, adding sepiolite powder, superfine mica powder, nano boron nitride and hollow glass beads, and stirring for 40min under heat preservation to obtain a mixture A;
(2) heating polyvinyl chloride resin to be fully melted to obtain a material B;
(3) and (3) mixing the mixture A and the mixture B, uniformly stirring, adding sodium methyl silicate, epoxy octyl stearate, tetramethyl thiuram dithionate and cottonseed oil, stirring at 100 ℃ for 20min, and naturally cooling to room temperature.
The coatings of the examples and the comparative examples are respectively selected, the pipelines are treated according to the method of the invention, each 12-segment pipeline is 10cm in length, after treatment, the pipelines of each group are respectively placed in environments of 6mol/L HCl aqueous solution, 6mol/L NaOH aqueous solution and 6mol/L NaCl aqueous solution, 30 ℃ below zero and 60 ℃, the time required by the corrosion phenomena of bubbles and falling of the coating materials on the surfaces of the pipelines of each group is respectively recorded, the acid resistance, alkali resistance, salt resistance, low temperature resistance and high temperature resistance of the materials of each group are detected, the results are averaged, and the characteristics of the examples and the comparative examples are shown in Table 1.
Table 1: comparative table of characteristics of examples and comparative examples
| Item | Acid resistance/d | Alkali resistance/d | Salt tolerance/d | Low temperature resistance/d | High temperature resistance/d |
| Example 1 | 180 | 237 | 277 | 386 | 322 |
| Example 2 | 185 | 240 | 281 | 392 | 330 |
| Example 3 | 181 | 236 | 278 | 389 | 325 |
| Comparative example 1 | 138 | 190 | 238 | 326 | 270 |
| Comparative example 2 | 142 | 193 | 236 | 322 | 267 |
From the above table it can be seen that: by adding the sepiolite powder, the superfine mica powder, the nano boron nitride, the hollow glass microspheres and the modified peanut shell powder, the acid resistance, alkali resistance, salt resistance, low temperature resistance and high temperature resistance of the coating can be improved, and the protection effect of the coating on a pipeline is improved.
Claims (9)
1. A harmless pipeline corrosion prevention method is characterized by comprising the following steps: the method comprises the following steps:
s1: scraping the inner and outer surfaces of the pipe with steel wire balls to remove impurities on the inner and outer surfaces;
s2: washing the inner and outer surfaces of the pipeline with clean water;
s3: drying the inner surface and the outer surface;
s4: coating a layer of anticorrosive paint on the inner surface and the outer surface of the natural gas pipeline, naturally standing for 25-35min, coating a layer of anticorrosive paint, and naturally drying;
the anticorrosive paint comprises the following raw materials in parts by weight:
40-45 parts of polyvinyl acetate emulsion, 35-37 parts of polyvinyl chloride resin, 6-8 parts of modified peanut shell powder, 3-5 parts of sodium methyl silicate, 3-5 parts of epoxy octyl stearate, 0.5-1 part of sepiolite powder, 1-3 parts of superfine mica powder, 0.5-1 part of nano boron nitride, 0.5-1 part of hollow glass microsphere, 0.5-1 part of tetramethyl thiuram dithionate and 4-6 parts of cottonseed oil.
2. The harmless pipe corrosion preventing method according to claim 1, wherein:
the preparation method of the modified peanut shells in the anticorrosive paint comprises the following steps: cleaning peanut shells, then placing the cleaned peanut shells into an oven for drying, placing the dried peanut shells into a pulverizer for pulverizing, placing the obtained peanut powder into a muffle furnace, heating to 250-plus-one temperature of 300 ℃ at a heating rate of 10-15 ℃/min under the protection of nitrogen, carrying out heat preservation carbonization for 10-20min, then heating to 350-plus-one temperature of 400 ℃ at a heating rate of 10-15 ℃/min, carrying out heat preservation carbonization for 8-15min, finally heating to 450-plus-one temperature of 500 ℃ at a heating rate of 10-15 ℃/min, and carrying out heat preservation carbonization for 8-15min to obtain the modified peanut shells.
3. The harmless pipe corrosion preventing method according to claim 1, wherein:
the preparation method of the anticorrosive paint comprises the following steps:
(1) heating the polyvinyl acetate emulsion to 60-70 ℃, adding sepiolite powder, superfine mica powder, nano boron nitride and hollow glass beads, and stirring at a constant temperature to obtain a mixture A;
(2) heating the polyvinyl chloride resin to be fully melted, adding the modified peanut shell powder, and stirring while keeping the temperature to obtain a mixture B;
(3) and mixing the mixture A and the mixture B, uniformly stirring, adding sodium methyl silicate, epoxy octyl stearate, tetramethyl thiuram dithionate and cottonseed oil, keeping the temperature at 90-100 ℃, stirring, and naturally cooling to room temperature.
4. The harmless pipe corrosion preventing method according to claim 3, wherein:
the stirring time in the step (1) is 30-40 min.
5. The harmless pipe corrosion preventing method according to claim 3, wherein:
the stirring time in the step (2) is 30-40 min.
6. The harmless pipe corrosion preventing method according to claim 3, wherein:
and (4) keeping the temperature and stirring for 20-30min in the step (3).
7. The harmless pipe corrosion preventing method according to claim 1, wherein:
the specific process of drying in step S3 is as follows: blowing with hot air at 70-80 deg.C for 10-20 min.
8. The method of claim 7, wherein:
the specific process of drying in step S3 is as follows: hot air at 75 ℃ was used to blow the mixture for 15 minutes.
9. The harmless pipe corrosion preventing method according to claim 1, wherein:
the thickness of the dried anticorrosive paint is 0.1-0.5 mm.
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