CN111826084A - High-temperature-resistant special anticorrosive paint for directly-buried heat-insulating pipe - Google Patents
High-temperature-resistant special anticorrosive paint for directly-buried heat-insulating pipe Download PDFInfo
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- 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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
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- 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
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/63—Additives non-macromolecular organic
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/65—Additives macromolecular
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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- 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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- 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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a high-temperature-resistant special anticorrosive paint for a direct-buried heat-insulating pipe, which comprises the following components in percentage by weight: phosphate modified epoxy organic silicon resin, enamel black, high-alumina powder, glass powder, a heat stabilizer, mica powder, talcum powder, a coupling agent, an epoxy resin high-temperature curing agent, a defoaming agent and a film-forming auxiliary agent; the weight parts of the components are respectively as follows: 30-35 parts of phosphate modified epoxy organic silicon resin, 8-10 parts of enamel black, 4-6 parts of high-alumina powder, 14-16 parts of glass powder, 0.5-0.6 part of heat stabilizer, 4-6 parts of mica powder, 4-6 parts of talcum powder, 0.4-0.6 part of coupling agent, 0.4-0.6 part of epoxy resin high-temperature curing agent, 0.8-1.2 parts of defoaming agent and 0.2-0.4 part of film-forming assistant.
Description
Technical Field
The invention relates to the technical field of anticorrosive coatings, in particular to a high-temperature-resistant special anticorrosive coating for a direct-buried heat-insulating pipe.
Background
The directly-buried heat-insulating pipeline is also called a prefabricated heat-insulating pipeline and is divided into two types, one type is a plastic-sheathed steel heat-insulating pipe, the other type is a high-density polyethylene directly-buried heat-insulating pipeline, the other type is a steel-sheathed steel heat-insulating pipe, the other type is a high-temperature steam heat-insulating pipe, because the direct-buried heat-insulating pipe is usually directly buried in the soil in the using process and because the direct-buried heat-insulating pipe is directly contacted with the soil, the direct-buried heat-insulating pipe is easy to corrode after being contacted for a long time, the service life of the direct-buried heat-insulating pipe is shortened, therefore, before the direct-buried heat-insulating pipe is used, the surface of the direct-buried heat-insulating pipe needs to be coated with the high-temperature-resistant anticorrosive paint, but the existing high-temperature-resistant anticorrosive paint is easy to generate a large amount of bubbles in the production process, the contact area between the coating and the directly-buried heat-insulating pipe is reduced due to the existence of the bubbles, so that the viscosity of the coating is reduced, and the traditional high-temperature-resistant anticorrosive coating is low in wear resistance and easy to cause damage to the directly-buried heat-insulating pipe.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant special anticorrosive paint for a direct-buried heat-insulating pipe, which solves the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a high-temperature-resistant special anticorrosive paint for a directly-buried heat-insulating pipe comprises the following components in percentage by weight: phosphate modified epoxy organic silicon resin, enamel black, high-alumina powder, glass powder, a heat stabilizer, mica powder, talcum powder, a coupling agent, an epoxy resin high-temperature curing agent, a defoaming agent and a film-forming auxiliary agent; the weight parts of the components are respectively as follows: 30-35 parts of phosphate modified epoxy organic silicon resin, 8-10 parts of enamel black, 4-6 parts of high-alumina powder, 14-16 parts of glass powder, 0.5-0.6 part of heat stabilizer, 4-6 parts of mica powder, 4-6 parts of talcum powder, 0.4-0.6 part of coupling agent, 0.4-0.6 part of epoxy resin high-temperature curing agent, 0.8-1.2 parts of defoaming agent and 0.2-0.4 part of film-forming additive.
According to the technical scheme, the heat stabilizer is one of a calcium zinc stabilizer, an organic tin heat stabilizer and a methyl tin heat stabilizer.
According to the technical scheme, the coupling agent is one of silane coupling agent, titanate coupling agent and aluminate coupling agent.
According to the technical scheme, the defoaming agent is prepared by mixing 15-20 parts of dimethyl silicone oil, 3-5 parts of silicon dioxide, 4-5 parts of white carbon black, 2-3 parts of paraffin, 4-5 parts of castor oil and 2-3 parts of sorbitan oleate emulsifier in parts by weight.
According to the technical scheme, the film-forming assistant is one or a mixture of more of ethylene glycol butyl ether, propylene glycol phenyl ether and dibutyl phthalate.
According to the technical scheme, the preparation method of the high-temperature-resistant special anticorrosive paint for the directly-buried heat-insulating pipe comprises the following steps of firstly, weighing raw materials; step two, mixing and grinding; step three, stirring and mixing; step four, filtering and warehousing;
in the first step, 30-35 parts of phosphate modified epoxy organic silicon resin, 8-10 parts of enamel black, 4-6 parts of high-alumina powder, 14-16 parts of glass powder, 0.5-0.6 part of heat stabilizer, 4-6 parts of mica powder, 4-6 parts of talcum powder, 0.4-0.6 part of coupling agent, 0.4-0.6 part of epoxy resin high-temperature curing agent, 0.8-1.2 parts of defoaming agent and 0.2-0.4 part of film-forming assistant are weighed according to the parts by weight of the components for later use;
in the second step, the enamel black, the high-alumina powder, the glass powder, the mica powder and the talcum powder weighed in the first step are respectively placed in a stirrer to be stirred to obtain a first-time mixture, the stirring time is 30-45min, the stirring speed is 800-1000r/min, then the obtained first-time mixture is placed in a sphere grinder to be ground to obtain aggregates, and the particle fineness of the aggregates is 30-40 mu m;
wherein in the third step, the phosphate ester modified epoxy organic silicon resin, the defoaming agent and the film-forming assistant weighed in the first step are placed in a reaction kettle to be stirred to obtain a second mixture, the stirring speed is 200-, when the temperature in the reaction kettle is cooled to normal temperature, a semi-finished product can be obtained;
and in the fourth step, placing the semi-finished product obtained in the third step into a coating filter bag for filtering, placing the filtered semi-finished product into a vibration machine for vibration for 2-3 minutes, and then barreling and warehousing the vibrated semi-finished product to obtain a finished product.
Compared with the prior art, the invention has the following beneficial effects: according to the high-temperature-resistant special anticorrosive coating for the directly-buried heat-insulating pipe, the added defoaming agent and the semi-finished coating are subjected to vibration treatment in the production process, so that the amount of bubbles contained in the coating is sufficiently reduced, the contact area between the coating and the directly-buried heat-insulating pipe is increased, and the viscosity of the coating is improved; and the added high-alumina powder, glass powder, mica powder and talcum powder not only improve the high-temperature resistance and the corrosion resistance, but also increase the wear resistance of the coating.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Referring to fig. 1, the present invention provides a technical solution:
example 1:
a high-temperature-resistant special anticorrosive paint for a directly-buried heat-insulating pipe comprises the following components in percentage by weight: phosphate modified epoxy organic silicon resin, enamel black, high-alumina powder, glass powder, a heat stabilizer, mica powder, talcum powder, a coupling agent, an epoxy resin high-temperature curing agent, a defoaming agent and a film-forming auxiliary agent; the weight parts of the components are respectively as follows: 30-35 parts of phosphate modified epoxy organic silicon resin, 8-10 parts of enamel black, 4-6 parts of high-alumina powder, 14-16 parts of glass powder, 0.5-0.6 part of heat stabilizer, 4-6 parts of mica powder, 4-6 parts of talcum powder, 0.4-0.6 part of coupling agent, 0.4-0.6 part of epoxy resin high-temperature curing agent, 0.8-1.2 parts of defoaming agent and 0.2-0.4 part of film-forming additive, wherein the heat stabilizer is one of calcium-zinc stabilizer, organic tin heat stabilizer and methyl tin heat stabilizer, the coupling agent is one of silane coupling agent, titanate coupling agent and aluminate coupling agent, and the defoaming agent is prepared from 15-20 parts of dimethyl silicone oil, 3-5 parts of silicon dioxide, 4-5 parts of white carbon black, 2-3 parts of paraffin wax, 2-3 parts of calcium-zinc stabilizer, titanate coupling agent and methyl tin heat stabilizer by weight, 4-5 parts of castor oil and 2-3 parts of sorbitan oleate emulsifier, wherein the film-forming assistant is one or a mixture of ethylene glycol butyl ether, propylene glycol phenyl ether and dibutyl phthalate.
According to the technical scheme, the preparation method of the high-temperature-resistant special anticorrosive paint for the directly-buried heat-insulating pipe comprises the following steps of firstly, weighing raw materials; step two, mixing and grinding; step three, stirring and mixing; step four, filtering and warehousing;
in the first step, 30 parts of phosphate modified epoxy organic silicon resin, 8 parts of enamel black, 4 parts of high-alumina powder, 14 parts of glass powder, 0.5 part of heat stabilizer, 5 parts of mica powder, 5 parts of talcum powder, 0.5 part of coupling agent, 0.5 part of epoxy resin high-temperature curing agent, 1 part of defoaming agent and 0.3 part of film-forming assistant are weighed according to the parts by weight of the components for later use;
in the second step, the enamel black, the high-alumina powder, the glass powder, the mica powder and the talcum powder weighed in the first step are respectively placed in a stirrer to be stirred to obtain a first-time mixture, the stirring time is 30-45min, the stirring speed is 800-1000r/min, then the obtained first-time mixture is placed in a sphere grinder to be ground to obtain aggregates, and the particle fineness of the aggregates is 30-40 mu m;
wherein in the third step, the phosphate ester modified epoxy organic silicon resin, the defoaming agent and the film-forming assistant weighed in the first step are placed in a reaction kettle to be stirred to obtain a second mixture, the stirring speed is 200-, when the temperature in the reaction kettle is cooled to normal temperature, a semi-finished product can be obtained;
and in the fourth step, placing the semi-finished product obtained in the third step into a coating filter bag for filtering, placing the filtered semi-finished product into a vibration machine for vibration for 2-3 minutes, and then barreling and warehousing the vibrated semi-finished product to obtain a finished product.
Example 2:
a high-temperature-resistant special anticorrosive paint for a directly-buried heat-insulating pipe comprises the following components in percentage by weight: phosphate modified epoxy organic silicon resin, enamel black, high-alumina powder, glass powder, a heat stabilizer, mica powder, talcum powder, a coupling agent, an epoxy resin high-temperature curing agent, a defoaming agent and a film-forming auxiliary agent; the weight parts of the components are respectively as follows: 30-35 parts of phosphate modified epoxy organic silicon resin, 8-10 parts of enamel black, 4-6 parts of high-alumina powder, 14-16 parts of glass powder, 0.5-0.6 part of heat stabilizer, 4-6 parts of mica powder, 4-6 parts of talcum powder, 0.4-0.6 part of coupling agent, 0.4-0.6 part of epoxy resin high-temperature curing agent, 0.8-1.2 parts of defoaming agent and 0.2-0.4 part of film-forming additive, wherein the heat stabilizer is one of calcium-zinc stabilizer, organic tin heat stabilizer and methyl tin heat stabilizer, the coupling agent is one of silane coupling agent, titanate coupling agent and aluminate coupling agent, and the defoaming agent is prepared from 15-20 parts of dimethyl silicone oil, 3-5 parts of silicon dioxide, 4-5 parts of white carbon black, 2-3 parts of paraffin wax, 2-3 parts of calcium-zinc stabilizer, titanate coupling agent and methyl tin heat stabilizer by weight, 4-5 parts of castor oil and 2-3 parts of sorbitan oleate emulsifier, wherein the film-forming assistant is one or a mixture of ethylene glycol butyl ether, propylene glycol phenyl ether and dibutyl phthalate.
According to the technical scheme, the preparation method of the high-temperature-resistant special anticorrosive paint for the directly-buried heat-insulating pipe comprises the following steps of firstly, weighing raw materials; step two, mixing and grinding; step three, stirring and mixing; step four, filtering and warehousing;
in the first step, 33 parts of phosphate modified epoxy organic silicon resin, 9 parts of enamel black, 5 parts of high-alumina powder, 15 parts of glass powder, 0.5 part of heat stabilizer, 5 parts of mica powder, 5 parts of talcum powder, 0.5 part of coupling agent, 0.5 part of epoxy resin high-temperature curing agent, 1 part of defoaming agent and 0.3 part of film-forming assistant are weighed according to the parts by weight of the components for later use;
in the second step, the enamel black, the high-alumina powder, the glass powder, the mica powder and the talcum powder weighed in the first step are respectively placed in a stirrer to be stirred to obtain a first-time mixture, the stirring time is 30-45min, the stirring speed is 800-1000r/min, then the obtained first-time mixture is placed in a sphere grinder to be ground to obtain aggregates, and the particle fineness of the aggregates is 30-40 mu m;
wherein in the third step, the phosphate ester modified epoxy organic silicon resin, the defoaming agent and the film-forming assistant weighed in the first step are placed in a reaction kettle to be stirred to obtain a second mixture, the stirring speed is 200-, when the temperature in the reaction kettle is cooled to normal temperature, a semi-finished product can be obtained;
and in the fourth step, placing the semi-finished product obtained in the third step into a coating filter bag for filtering, placing the filtered semi-finished product into a vibration machine for vibration for 2-3 minutes, and then barreling and warehousing the vibrated semi-finished product to obtain a finished product.
Example 3:
a high-temperature-resistant special anticorrosive paint for a directly-buried heat-insulating pipe comprises the following components in percentage by weight: phosphate modified epoxy organic silicon resin, enamel black, high-alumina powder, glass powder, a heat stabilizer, mica powder, talcum powder, a coupling agent, an epoxy resin high-temperature curing agent, a defoaming agent and a film-forming auxiliary agent; the weight parts of the components are respectively as follows: 30-35 parts of phosphate modified epoxy organic silicon resin, 8-10 parts of enamel black, 4-6 parts of high-alumina powder, 14-16 parts of glass powder, 0.5-0.6 part of heat stabilizer, 4-6 parts of mica powder, 4-6 parts of talcum powder, 0.4-0.6 part of coupling agent, 0.4-0.6 part of epoxy resin high-temperature curing agent, 0.8-1.2 parts of defoaming agent and 0.2-0.4 part of film-forming additive, wherein the heat stabilizer is one of calcium-zinc stabilizer, organic tin heat stabilizer and methyl tin heat stabilizer, the coupling agent is one of silane coupling agent, titanate coupling agent and aluminate coupling agent, and the defoaming agent is prepared from 15-20 parts of dimethyl silicone oil, 3-5 parts of silicon dioxide, 4-5 parts of white carbon black, 2-3 parts of paraffin wax, 2-3 parts of calcium-zinc stabilizer, titanate coupling agent and methyl tin heat stabilizer by weight, 4-5 parts of castor oil and 2-3 parts of sorbitan oleate emulsifier, wherein the film-forming assistant is one or a mixture of ethylene glycol butyl ether, propylene glycol phenyl ether and dibutyl phthalate.
According to the technical scheme, the preparation method of the high-temperature-resistant special anticorrosive paint for the directly-buried heat-insulating pipe comprises the following steps of firstly, weighing raw materials; step two, mixing and grinding; step three, stirring and mixing; step four, filtering and warehousing;
in the first step, 35 parts of phosphate modified epoxy organic silicon resin, 10 parts of enamel black, 6 parts of high-alumina powder, 16 parts of glass powder, 0.5 part of heat stabilizer, 5 parts of mica powder, 5 parts of talcum powder, 0.5 part of coupling agent, 0.5 part of epoxy resin high-temperature curing agent, 1 part of defoaming agent and 0.3 part of film-forming assistant are weighed according to the parts by weight of the components for later use;
in the second step, the enamel black, the high-alumina powder, the glass powder, the mica powder and the talcum powder weighed in the first step are respectively placed in a stirrer to be stirred to obtain a first-time mixture, the stirring time is 30-45min, the stirring speed is 800-1000r/min, then the obtained first-time mixture is placed in a sphere grinder to be ground to obtain aggregates, and the particle fineness of the aggregates is 30-40 mu m;
wherein in the third step, the phosphate ester modified epoxy organic silicon resin, the defoaming agent and the film-forming assistant weighed in the first step are placed in a reaction kettle to be stirred to obtain a second mixture, the stirring speed is 200-, when the temperature in the reaction kettle is cooled to normal temperature, a semi-finished product can be obtained;
and in the fourth step, placing the semi-finished product obtained in the third step into a coating filter bag for filtering, placing the filtered semi-finished product into a vibration machine for vibration for 2-3 minutes, and then barreling and warehousing the vibrated semi-finished product to obtain a finished product.
The coating obtained in the above example is respectively and uniformly coated on a direct-buried heat preservation pipe, and then placed in seawater at 60 ℃ for 30 days to be soaked, and the obtained results are as follows:
appearance of the coating | |
Example 1 | No cracking, peeling and falling off |
Example 2 | No cracking, peeling and falling off |
Example 3 | No cracking, peeling and falling off |
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The high-temperature-resistant special anticorrosive paint for the directly-buried heat-insulating pipe is characterized by comprising the following components in parts by weight: the formula comprises the following components: phosphate modified epoxy organic silicon resin, enamel black, high-alumina powder, glass powder, a heat stabilizer, mica powder, talcum powder, a coupling agent, an epoxy resin high-temperature curing agent, a defoaming agent and a film-forming auxiliary agent; the weight parts of the components are respectively as follows: 28-32 parts of phosphate modified epoxy organic silicon resin, 8-10 parts of enamel black, 4-6 parts of high-alumina powder, 14-16 parts of glass powder, 0.5-0.6 part of heat stabilizer, 4-6 parts of mica powder, 4-6 parts of talcum powder, 0.4-0.6 part of coupling agent, 0.4-0.6 part of epoxy resin high-temperature curing agent, 0.8-1.2 parts of defoaming agent and 0.2-0.4 part of film-forming additive.
2. The high-temperature-resistant special anticorrosive paint for the directly-buried heat-insulating pipe according to claim 1, characterized in that: the heat stabilizer is one of a calcium zinc stabilizer, an organic tin heat stabilizer and a methyl tin heat stabilizer.
3. The high-temperature-resistant special anticorrosive paint for the directly-buried heat-insulating pipe according to claim 1, characterized in that: the coupling agent is one of silane coupling agent, titanate coupling agent and aluminate coupling agent.
4. The high-temperature-resistant special anticorrosive paint for the directly-buried heat-insulating pipe according to claim 1, characterized in that: the defoaming agent is prepared by mixing 15-20 parts of dimethyl silicone oil, 3-5 parts of silicon dioxide, 4-5 parts of white carbon black, 2-3 parts of paraffin, 4-5 parts of castor oil and 2-3 parts of sorbitan oleate emulsifier in parts by weight.
5. The high-temperature-resistant special anticorrosive paint for the directly-buried heat-insulating pipe according to claim 1, characterized in that: the film-forming assistant is one or a mixture of more of ethylene glycol butyl ether, propylene glycol phenyl ether and dibutyl phthalate.
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Cited By (1)
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CN117186769A (en) * | 2023-08-29 | 2023-12-08 | 陕西鑫宏宇防腐科技有限公司 | Wax-proof scale-proof anticorrosive paint and preparation method thereof |
Citations (2)
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CN101486875A (en) * | 2009-02-13 | 2009-07-22 | 江苏荣昌化工有限公司 | High temperature resistant anticorrosion modified epoxy organosilicon coating |
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CN101486875A (en) * | 2009-02-13 | 2009-07-22 | 江苏荣昌化工有限公司 | High temperature resistant anticorrosion modified epoxy organosilicon coating |
CN104893570A (en) * | 2015-07-02 | 2015-09-09 | 任碧龙 | High-temperature-resistant anti-corrosive coating |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN117186769A (en) * | 2023-08-29 | 2023-12-08 | 陕西鑫宏宇防腐科技有限公司 | Wax-proof scale-proof anticorrosive paint and preparation method thereof |
CN117186769B (en) * | 2023-08-29 | 2024-05-03 | 陕西鑫宏宇防腐科技有限公司 | Wax-proof scale-proof anticorrosive paint and preparation method thereof |
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