CN111303725A - Concrete reinforcing steel bar permeation anticorrosion powder coating and preparation method thereof - Google Patents
Concrete reinforcing steel bar permeation anticorrosion powder coating and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 23
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
- C09D5/03—Powdery paints
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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
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/103—Anti-corrosive paints containing metal dust containing Al
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- 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
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
-
- 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
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a concrete reinforcement permeation anticorrosion powder coating and a preparation method thereof, wherein the anticorrosion powder coating is prepared by uniformly dispersing epoxy resin, a curing agent, a flatting agent, an antioxidant, layered nano powder and aluminum powder, extruding the mixture into strips by a double-screw extruder, and crushing and grinding the strips to obtain a pretreated powder coating; compounding polysilazane and a microporous inorganic substance, and spraying paraffin on the surfaces of the composite particles to obtain a film-forming aid; then uniformly dispersing the pretreated powder coating and the film-forming assistant to obtain the paint. In the anticorrosive powder coating provided by the invention, the layered nano powder can improve the compactness of the coating and is beneficial to forming a barrier layer; the aluminum powder can be tightly combined on the surface of the steel bar by powder coating, and is easy to oxidize to form an aluminum oxide anticorrosive protective layer, so that the corrosion resistance under severe environment is improved; meanwhile, the polysilazane and the microporous inorganic substance are compounded, and paraffin is sprayed on the surface of the compounded polysilazane and microporous inorganic substance, so that the finally obtained powder coating has good film-forming corrosion resistance.
Description
Technical Field
The invention relates to the technical field of building coatings, in particular to a concrete reinforcing steel bar penetration anticorrosion powder coating and a preparation method thereof.
Background
The anticorrosive paint forms a continuous coating on the surface of an object to be coated through coating construction, thereby achieving the protection, the beauty and certain special functions. The quality of the protective performance of the anti-corrosion coating not only depends on the physical and chemical properties of the coating, but also has a great relationship with the coating structure, the coating construction technology for forming the coating and the coating operation environment. With the higher and higher requirements of modern society on the anticorrosion of materials, the development and application of anticorrosive coatings are receiving wide attention.
The anticorrosive paint has various kinds, and the powder paint is solid powder synthetic resin paint comprising solid resin, pigment, stuffing, assistant, etc. Different from common solvent-based coatings and water-based coatings, the powder coating has no solvent pollution, is convenient to store, and has excellent durability after film forming. Compared with the traditional solvent coating and water-based coating, the powder coating has wider application field and range. Particularly, epoxy resin powder coatings have good wear resistance, temperature resistance, corrosion resistance and the like, and are developed and utilized in large scale in the fields of buildings, industries and the like, and particularly in the field of heavy corrosion resistance, the epoxy resin powder coatings are most widely applied.
At present, with the rapid development of the building industry, the requirement on the concrete corrosion resistance of bridges, ports and industrial facilities is higher and higher. The conventional anticorrosive paint is difficult to meet the anticorrosive requirement. A large amount of reinforcing steel bars are used in concrete, and corrosion of the reinforcing steel bars is a key factor causing performance degradation of the concrete. Generally, steel bars are embedded into concrete to increase the strength of the concrete, but due to the properties of the concrete, the concrete has many micropores, and acids, alkalis and salts in the external environment can directly attack the steel bars through the micropores, directly causing the concrete to crack and the strength to be suddenly reduced. Therefore, the corrosion prevention protection of the steel bars is very important to prevent the steel bars from being corroded by atmosphere, water, acid and alkali and the like. At present, the protection treatment of the reinforcing steel bars by using epoxy resin powder coating in the field of buildings has become common.
The Chinese patent application No. 200910170006.2 discloses a room temperature cured anticorrosive paint for concrete structure steel bars and a preparation method thereof. The paint system consists of a primer and a finish, wherein the primer and the finish both comprise a component A and a component B which are mixed for use. The primer A component comprises the following components in parts by weight: 10-30 parts of epoxy resin 1, 5-15 parts of epoxy resin 2, 30-55 parts of pigment and filler, 0.5-1 part of auxiliary agent and 20-40 parts of solvent; the weight ratio of each component in the finish paint A is as follows: 10-30 parts of epoxy resin 1, 5-15 parts of epoxy resin 2, 10-30 parts of pigment and filler, 10-30 parts of glass flake, 0.2-1 part of auxiliary agent and 20-40 parts of solvent; the component B of the primer and the component B of the finish are the same and are at least one of aliphatic amine, aromatic amine and polyamide. The Chinese patent application number 201610835239.X discloses an anticorrosive paint for reinforced concrete, a preparation method and an application thereof, wherein the anticorrosive paint comprises the following components in parts by weight: 8-30 parts of novolac epoxy resin, 4-20 parts of ethylene glycol diglycidyl ether, 4-20 parts of butanol, 1-5 parts of xylene unsaturated polyester resin, 7-32 parts of modified amine epoxy resin curing agent, 0.8-4 parts of toluene-2, 6-diisocyanate and/or modified toluene-2, 6-diisocyanate, 5-25 parts of mica flake and 2-3 parts of superfine silicon dioxide.
In order to solve the problem that the epoxy resin anticorrosive paint still has electrochemical corrosion when being used for corrosion prevention of concrete reinforcements, a novel anticorrosive epoxy resin powder paint is needed to be provided, and further the anticorrosive effect on the reinforced concrete is improved.
Disclosure of Invention
Aiming at the outstanding problem that acid, alkali and salt corrode the reinforcing steel bars in severe environment when the epoxy resin powder coating is used for carrying out anticorrosion treatment on the reinforcing steel bars at present, the invention provides the concrete reinforcing steel bar permeation anticorrosion powder coating and the preparation method thereof, thereby obviously improving the anticorrosion effect of the powder coating on the concrete reinforcing steel bars.
In order to solve the problems, the invention adopts the following technical scheme:
a concrete reinforcement permeation anticorrosion powder coating is prepared by uniformly dispersing epoxy resin, a curing agent, a leveling agent, an antioxidant, layered nano powder and aluminum powder, extruding the mixture into strips by a double-screw extruder, crushing and grinding the strips to obtain a pretreated powder coating; compounding polysilazane and a microporous inorganic substance, and spraying paraffin on the surfaces of the composite particles to obtain a film-forming aid; then uniformly dispersing the pretreated powder coating and the film-forming assistant to obtain the paint.
Preferably, the epoxy resin is epoxy resin E-12.
Preferably, the curing agent is dicyandiamide.
Preferably, the leveling agent is silicon acrylate.
Preferably, the antioxidant is one of compound antioxidants JY-215, JY-220 and JY-225.
Preferably, the layered nano powder is one or a combination of two of nano-scale mica powder and graphite oxide powder.
Preferably, the microporous inorganic substance is one or a combination of two of zeolite, molecular sieve, silica gel and activated carbon.
The invention also provides a preparation method of the concrete reinforcing steel bar penetration anticorrosive powder coating, which comprises the following specific steps:
(1) adding epoxy resin, a curing agent, a flatting agent, an antioxidant, layered nano powder and aluminum powder into a high-speed mixer, and uniformly stirring and mixing at a high speed to obtain a mixed dispersed material;
(2) adding the mixed and dispersed materials into a double-screw extruder, extruding the materials into strips by using a screw, and then crushing, grinding and sieving the strips by using a crushing and grinding machine to obtain a pretreated powder coating;
(3) compounding polysilazane with a microporous inorganic substance, and then carrying out vacuum treatment to enable the microporous inorganic substance to fully adsorb the polysilazane to obtain composite particles; adding the composite particles into a stirrer, suspending under nitrogen gas flow, heating and melting paraffin, and depositing the paraffin on the surfaces of the composite particles by spraying to obtain a film-forming aid;
(4) and uniformly dispersing the pretreated powder coating and the film-forming assistant to obtain the concrete reinforcing steel bar penetration anticorrosive powder coating.
Preferably, the high-speed stirring speed in the step (1) is 500-600rpm, and the stirring dispersion is 30-40 min.
Preferably, in the preparation of the mixed dispersed material in the step (1), the mass ratio of the epoxy resin, the curing agent, the leveling agent, the antioxidant, the layered nano powder and the aluminum powder is 50-60: 1-2:1-3:1-2:5-10: 5-8.
Preferably, the screw extrusion temperature in step (2) is 90-100 ℃.
Preferably, the rotation speed of the crushing and grinding in the step (2) is 300-500rpm, the time is 20-30min, and the crushed and ground materials are sieved by a 100-mesh sieve.
Preferably, in the preparation of the composite particles in the step (3), the mass ratio of the polysilazane to the microporous inorganic substance is 3-5: 1-2.
Preferably, in the preparation of the film-forming assistant in the step (3), the mass ratio of the composite particles to the paraffin is 100: 3-5.
Preferably, the vacuum gauge reading of the vacuum treatment in step (3) is 0.06MPa, and the treatment is carried out for 10-15 min.
Preferably, in the step (4), in the preparation of the concrete reinforcing steel bar penetration anticorrosive powder coating, the mass ratio of the pretreatment powder coating to the film-forming assistant is 100: 3-5.
In the field of anticorrosion of concrete steel bars, it is known that anticorrosion treatment of steel bars by using epoxy resin powder coating is common, but because the epoxy resin powder coating is poor in binding property and adhesiveness with the steel bars and interface gaps are easy to exist, acid, alkali, seawater, air and the like can still contact with the steel bars, and electrochemical corrosion is formed. According to the invention, the traditional epoxy resin powder coating is treated, so that the anticorrosion effect on the concrete reinforcing steel bar is improved.
The raw materials of the epoxy resin powder coating mainly comprise epoxy resin, a curing agent, a flatting agent and an antioxidant, and layered nano powder and aluminum powder are creatively added at the same time, so that the epoxy resin powder coating is pretreated by high-speed mixing. The layered nano powder can be selected from nano-scale mica powder and graphite oxide powder, and the nano-particle size of the layered nano powder can block a micro-channel in the coating, so that the compactness of the coating is improved, and meanwhile, the layered structure is favorable for forming a barrier layer, and corrosion media are effectively prevented from permeating after the coating is formed by the coating; the aluminum powder is added, on one hand, because the aluminum powder and the reinforcing steel bar are similar in polarity and easy to combine, the powder coating is tightly combined with the surface of the reinforcing steel bar, and interface gaps can be reduced, so that corrosive substances are prevented from being immersed; on the other hand, the aluminum powder is easy to oxidize to form aluminum oxide, so that an anti-corrosion protective layer is formed, and the anti-corrosion property of the coating in severe environment can be improved.
Furthermore, the polysilazane and the microporous inorganic substance are compounded and then subjected to vacuum treatment, so that the microporous inorganic substance can fully adsorb the polysilazane, and composite particles are obtained; then the paraffin wax is melted and sprayed on the surface of the composite particles, so that the stability of the polysilazane can be ensured, and the stable film-forming additive can be obtained.
Furthermore, the film forming additive and the pretreated epoxy resin powder coating are uniformly dispersed, the film forming additive is compounded in the pretreated powder coating, paraffin can be melted by high-temperature curing when the pretreated powder coating is used, and polysilazane is converted into SiO at high temperature2The SiCN film not only has excellent corrosion resistance, but also can be easily and tightly combined with a metal reinforcing steel bar due to the characteristic of Si-N polarity in the structure, thereby forming the film with excellent corrosion resistance.
The existing concrete reinforcing steel bar is easy to corrode, and in order to further prevent the reinforcing steel bar from being corroded by acid, alkali and salt, the problem that the reinforcing steel bar is corroded by acid, alkali and salt particularly in severe environments is solved. In view of the above, the invention provides a concrete reinforcement permeation anticorrosion powder coating and a preparation method thereof, epoxy resin, a curing agent, a leveling agent, an antioxidant, layered nano powder and aluminum powder are uniformly mixed in a high-speed mixer to obtain a mixed dispersed material; extruding the mixed and dispersed materials into strips by a double-screw extruder, and then crushing and grinding by using a crushing and grinding machine to obtain the pretreated powder coating; compounding polysilazane with microporous inorganic matter, and performing vacuum treatment to enable the microporous inorganic matter to fully adsorb the polysilazane to obtain composite particles; adding the composite particles into a stirrer, suspending under nitrogen gas flow, heating and melting paraffin, and depositing the paraffin on the surfaces of the composite particles by spraying to obtain a film-forming aid; and uniformly dispersing the pretreated powder coating and the film-forming assistant to obtain the concrete reinforcing steel bar penetration anticorrosive powder coating. In the anticorrosive powder coating provided by the invention, the layered nano powder can improve the compactness of the coating and is beneficial to forming a barrier layer; the aluminum powder can be tightly combined on the surface of the steel bar by powder coating, and is easy to oxidize to form an aluminum oxide anticorrosive protective layer, so that the corrosion resistance under severe environment is improved; meanwhile, the polysilazane and the microporous inorganic substance are compounded, and paraffin is sprayed on the surface of the compounded polysilazane and microporous inorganic substance, so that the finally obtained powder coating has good film-forming corrosion resistance.
Compared with the prior art, the invention provides a concrete reinforcement penetration anticorrosion powder coating and a preparation method thereof, and the outstanding characteristics and excellent effects are as follows:
1. the concrete reinforcing steel bar penetration anticorrosion powder coating prepared by the invention has excellent anticorrosion performance and wide application prospect.
2. According to the invention, the layered nano powder is used, and the nano particle size of the layered nano powder can block a micro-channel in the coating, so that the compactness of the coating is improved, and the immersion of an external corrosive medium is prevented; the layered structure is favorable for forming a barrier layer and preventing corrosive media from permeating.
3. The aluminum powder is used, on one hand, the aluminum powder is similar to the reinforcing steel bar in polarity and easy to combine, and after the powder coating is added, the powder coating is tightly combined on the surface of the reinforcing steel bar, so that interface gaps are reduced, and corrosive substances are prevented from being immersed; on the other hand, the aluminum powder is easy to oxidize to form an aluminum oxide anticorrosive protective layer, and the corrosion resistance in severe environment is improved.
4. The powder coating is prepared by loading polysilazane on microporous inorganic substance, and when the powder coating is used, the powder coating is cured at high temperature and SiO formed by converting polysilazane2SiCN not only has excellent corrosion resistance, but also is easy to be tightly combined with metal reinforcing steel bars due to the characteristic of Si-N polarity in the structure, thereby having good film-forming corrosion resistance.
Drawings
FIG. 1: a preparation flow chart of the anticorrosive powder coating.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
(1) Adding 55kg of epoxy resin E-12, 1.5kg of dicyandiamide, 2kg of silicon acrylate, 1.5kg of composite antioxidant JY-215, 8kg of nano-mica powder and 6.5kg of aluminum powder into a high-speed mixer, and stirring for 35min at the rotating speed of 550rpm to obtain a mixed dispersed material;
(2) adding the mixed and dispersed materials into a double-screw extruder, extruding the materials into strips by using a screw at the temperature of 95 ℃, then using a crushing and grinding machine to crush and grind the materials for 25min at the rotating speed of 400rpm, and sieving the materials by using a 100-mesh sieve to obtain a pretreated powder coating;
(3) compounding 4kg of polysilazane with 1.5kg of zeolite, then performing vacuum treatment with the reading of a vacuum meter of 0.06MPa for 10min to obtain composite particles; adding the composite particles into a stirrer, suspending the composite particles in nitrogen airflow, heating and melting paraffin with the mass of 4% of the mass of the composite particles, and depositing the paraffin on the surfaces of the composite particles by spraying to obtain a film-forming aid;
(4) and uniformly dispersing 100kg of the pretreated powder coating and 4kg of the film-forming assistant to obtain the concrete reinforcing steel bar penetration anticorrosive powder coating.
Example 2
(1) Adding 58kg of epoxy resin E-12, 1kg of dicyandiamide, 1.5kg of silicon acrylate, 1.2kg of composite antioxidant JY-220, 6kg of nano-scale graphite oxide powder and 6kg of aluminum powder into a high-speed mixer, and stirring for 38min at the rotating speed of 520rpm to obtain a mixed dispersed material;
(2) adding the mixed and dispersed materials into a double-screw extruder, extruding the materials into strips by using a screw at the temperature of 90 ℃, then crushing and grinding the strips for 28min by using a crushing and grinding machine at the rotating speed of 350rpm, and sieving the strips by using a 100-mesh sieve to obtain a pretreated powder coating;
(3) compounding 4.5kg of polysilazane with 1.2kg of molecular sieve, then performing vacuum treatment with the reading of a vacuum meter of 0.06MPa for 12min to obtain composite particles; adding the composite particles into a stirrer, suspending the composite particles in nitrogen airflow, heating and melting paraffin with the mass of 3.5% of the mass of the composite particles, and depositing the paraffin on the surfaces of the composite particles by spraying to obtain a film-forming aid;
(4) and uniformly dispersing 100kg of the pretreated powder coating and 3.5kg of the film-forming assistant to obtain the concrete reinforcing steel bar penetration anticorrosive powder coating.
Example 3
(1) Adding 52kg of epoxy resin E-12, 1.8kg of dicyandiamide, 2.5kg of silicon acrylate, 1.8kg of composite antioxidant JY-225, 9kg of nano-mica powder and 7kg of aluminum powder into a high-speed mixer, and stirring for 32min at the rotating speed of 580rpm to obtain a mixed dispersed material;
(2) adding the mixed and dispersed materials into a double-screw extruder, extruding the materials into strips by using a screw at the temperature of 100 ℃, then crushing and grinding the strips for 22min by using a crushing and grinding machine at the rotating speed of 450rpm, and sieving the strips by using a 100-mesh sieve to obtain a pretreated powder coating;
(3) compounding 3.5kg of polysilazane with 1.8kg of silica gel, then performing vacuum treatment for 15min, wherein the reading of a vacuum meter is 0.06MPa, and obtaining composite particles; adding the composite particles into a stirrer, suspending the composite particles in nitrogen airflow, heating and melting paraffin with the mass of 4.5% of the mass of the composite particles, and depositing the paraffin on the surfaces of the composite particles by spraying to obtain a film-forming aid;
(4) and uniformly dispersing 100kg of the pretreated powder coating and 4.5kg of the film-forming assistant to obtain the concrete reinforcing steel bar penetration anticorrosive powder coating.
Example 4
(1) Adding 60kg of epoxy resin E-12, 1kg of dicyandiamide, 1kg of silicon acrylate, 1kg of composite antioxidant JY-215, 5kg of nano-scale graphite oxide powder and 5kg of aluminum powder into a high-speed mixer, and stirring for 40min at the rotating speed of 500rpm to obtain a mixed dispersed material;
(2) adding the mixed and dispersed materials into a double-screw extruder, extruding the materials into strips by using a screw at the temperature of 90 ℃, then using a crushing and grinding machine to crush and grind the materials for 30min at the rotating speed of 300rpm, and sieving the materials by using a 100-mesh sieve to obtain a pretreated powder coating;
(3) compounding 5kg of polysilazane with 1kg of activated carbon, then performing vacuum treatment at a vacuum meter reading of 0.06MPa for 10min to obtain composite particles; adding the composite particles into a stirrer, suspending the composite particles in nitrogen airflow, heating and melting paraffin with the mass being 3% of the mass of the composite particles, and depositing the paraffin on the surfaces of the composite particles by spraying to obtain a film-forming aid;
(4) and uniformly dispersing 100kg of the pretreated powder coating and 3kg of the film-forming assistant to obtain the concrete reinforcing steel bar penetration anticorrosive powder coating.
Example 5
(1) Adding 50kg of epoxy resin E-12, 2kg of dicyandiamide, 3kg of silicon acrylate, 2kg of composite antioxidant JY-225, 10kg of nano-scale mica powder and 8kg of aluminum powder into a high-speed mixer, and stirring for 30min at the rotating speed of 600rpm to obtain a mixed dispersed material;
(2) adding the mixed and dispersed materials into a double-screw extruder, extruding into strips by using a screw at the temperature of 100 ℃, then crushing and grinding for 20min by using a crushing and grinding machine at the rotating speed of 500rpm, and sieving by using a 100-mesh sieve to obtain a pretreated powder coating;
(3) compounding 3kg of polysilazane with 2kg of zeolite, then performing vacuum treatment with the reading of a vacuum meter of 0.06MPa for 15min to obtain composite particles; adding the composite particles into a stirrer, suspending the composite particles in nitrogen airflow, heating and melting paraffin with the mass of 5% of the mass of the composite particles, and depositing the paraffin on the surfaces of the composite particles by spraying to obtain a film-forming aid;
(4) and uniformly dispersing 100kg of the pretreated powder coating and 5kg of the film-forming assistant to obtain the concrete reinforcing steel bar penetration anticorrosive powder coating.
Comparative example 1
Comparative example 1 compared to example 1, no coalescent was added, the others were identical to example 1.
The test method comprises the following steps:
and (3) testing the corrosion resistance: the powder coatings obtained in the examples and the comparative example 1 are used as samples, and the static spraying method is adopted in JG 3042 and 1997 epoxy resin coating steel bar, steel bars with the length of 15cm, the diameter of 25mm and the strength grade of RL335 are respectively subjected to surface spraying to form an anticorrosive coating with the thickness of 0.2mm (both sections are sprayed with the coating), and then the anticorrosive coating is cured for 25min at the temperature of 200 ℃ to obtain test samples. And soaking the steel bar sprayed with the coating in 500mL of salt solution with the sodium chloride concentration of 5%, maintaining for 30d, and testing the content of chloride ions in the solution, so as to calculate the daily permeability of the chloride ions in unit area of the surface of the steel bar, thereby judging the corrosion protection performance of the coating on the steel bar.
The formula is as follows: p = (m)0-mt) S,/30, wherein m0Mass of chloride ions in the solution; m istThe mass of chloride ions is 30 days after soaking; s is the surface area cm of the immersed steel bar2。
The test results are shown in table 1.
Table 1:
| performance index | Chloride ion attack (mg/cm)2•30d） |
| Example 1 | 7.5×10-4 |
| Example 2 | 7.3×10-4 |
| Example 3 | 8.9×10-4 |
| Example 4 | 7.1×10-4 |
| Example 5 | 9.2×10-4 |
| Comparative example 1 | 1.5×10-3 |
From the above, the powder coating coatings of the examples have excellent corrosion resistance. In the comparative example, no polysilazane was converted to SiO during the high temperature cure at the time of use because no film-forming agent was added to the powder coating2And SiCN, which deteriorates the bonding firmness of the powder coating layer with the reinforcing steel bar, causes gaps, etc., and thus deteriorates the corrosion resistance.
Claims (10)
1. The penetration anticorrosion powder coating for the concrete reinforcing steel bar is characterized in that epoxy resin, a curing agent, a flatting agent, an antioxidant, layered nano powder and aluminum powder are uniformly dispersed, extruded into strips by a double-screw extruder, crushed and ground to obtain a pretreated powder coating; compounding polysilazane and a microporous inorganic substance, and spraying paraffin on the surfaces of the composite particles to obtain a film-forming aid; and further uniformly dispersing the pretreated powder coating and the film-forming assistant.
2. The concrete reinforcing bar penetration anticorrosive powder coating of claim 1,
the epoxy resin is epoxy resin E-12;
the curing agent is dicyandiamide;
the leveling agent is silicon acrylate;
the antioxidant is one of compound antioxidants JY-215, JY-220 and JY-225;
the layered nano powder is one or the combination of two of nano-scale mica powder and graphite oxide powder;
the microporous inorganic substance is one or the combination of two of zeolite, molecular sieve, silica gel and active carbon.
3. The preparation method of the concrete reinforcing bar penetration anticorrosive powder coating as claimed in any one of claims 1 to 2, which is characterized by comprising the following steps:
(1) adding epoxy resin, a curing agent, a flatting agent, an antioxidant, layered nano powder and aluminum powder into a high-speed mixer, and uniformly stirring and mixing at a high speed to obtain a mixed dispersed material;
(2) adding the mixed and dispersed materials into a double-screw extruder, extruding the materials into strips by using a screw, and then crushing, grinding and sieving the strips by using a crushing and grinding machine to obtain a pretreated powder coating;
(3) compounding polysilazane with a microporous inorganic substance, and then carrying out vacuum treatment to enable the microporous inorganic substance to fully adsorb the polysilazane to obtain composite particles; adding the composite particles into a stirrer, suspending under nitrogen gas flow, heating and melting paraffin, and depositing the paraffin on the surfaces of the composite particles by spraying to obtain a film-forming aid;
(4) and uniformly dispersing the pretreated powder coating and the film-forming assistant to obtain the concrete reinforcing steel bar penetration anticorrosive powder coating.
4. The method for preparing the penetration anticorrosive powder coating for the concrete reinforcing steel bar according to claim 3, wherein the high-speed stirring in the step (1) is performed at 500-600rpm for stirring and dispersing for 30-40 min.
5. The preparation method of the concrete reinforcing steel bar penetration anticorrosive powder coating according to claim 3, wherein in the preparation of the mixed dispersed material in the step (1), the mass ratio of the epoxy resin, the curing agent, the leveling agent, the antioxidant, the layered nano powder and the aluminum powder is 50-60: 1-2:1-3:1-2:5-10: 5-8.
6. The method for preparing the powder coating for infiltration and corrosion prevention of the concrete reinforcing steel bar according to the claim 3, wherein the temperature of the screw extrusion in the step (2) is 90-100 ℃.
7. The method for preparing the concrete reinforcing steel bar penetration anticorrosive powder coating as claimed in claim 3, wherein the rotation speed of the grinding in the step (2) is 300-500rpm for 20-30min, and the ground powder passes through a 100-mesh sieve.
8. The preparation method of the concrete reinforcing steel bar penetration anticorrosion powder coating, according to the claim 3, is characterized in that in the preparation of the composite particles in the step (3), the mass ratio of polysilazane to microporous inorganic substances is 3-5: 1-2; in the preparation of the film-forming additive, the mass ratio of the composite particles to the paraffin is 100: 3-5.
9. The method for preparing the penetration anticorrosive powder coating for the concrete reinforcing steel bar, according to the claim 3, is characterized in that the reading of the vacuum gauge of the vacuum treatment in the step (3) is 0.06MPa, and the treatment time is 10-15 min.
10. The preparation method of the concrete reinforcing steel bar penetration anticorrosive powder coating according to claim 3, wherein in the preparation of the concrete reinforcing steel bar penetration anticorrosive powder coating in the step (4), the mass ratio of the pretreatment powder coating to the film-forming assistant is 100: 3-5.
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