CN110684443A - Anticorrosive powder coating for outdoor metal guardrail and preparation method thereof - Google Patents
Anticorrosive powder coating for outdoor metal guardrail and preparation method thereof Download PDFInfo
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- CN110684443A CN110684443A CN201911088712.2A CN201911088712A CN110684443A CN 110684443 A CN110684443 A CN 110684443A CN 201911088712 A CN201911088712 A CN 201911088712A CN 110684443 A CN110684443 A CN 110684443A
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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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
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
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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
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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
- C08K3/18—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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- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- Engineering & Computer Science (AREA)
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Abstract
The invention relates to an anticorrosive powder coating for an outdoor metal guardrail and a preparation method thereof, wherein the anticorrosive powder coating is prepared by mixing base powder and raw materials in a bonding machine according to a certain proportion and then sieving; the base powder comprises the following components in parts by weight: 40-60 parts of carboxyl-terminated polyester, 3-5 parts of curing agent, 5-10 parts of titanium dioxide, 5-15 parts of precipitated barium sulfate, 0-2 parts of defoaming agent, 0.6-1.3 parts of flatting agent, 0.5-1.2 parts of brightener, 0.05-0.2 part of light stabilizer, 0-1 part of pigment and 0.2-1 part of coupling agent; the raw materials consist of the following components in parts by weight: 0.1-0.5 part of bonding wax powder, 3-8 parts of glass flakes and 0.05-0.1 part of aluminum oxide C. The corresponding film forming component and the functional filler are selected, so that the weather resistance and the corrosion prevention effect of the film are obviously improved, the guardrail substrate is effectively protected, and the service life of the guardrail substrate is prolonged.
Description
Technical Field
The invention belongs to the field of powder coatings, and particularly relates to an anticorrosive powder coating for an outdoor metal guardrail and a preparation method thereof.
Background
The metal guardrail is used for personnel safety protection of municipal administration, traffic, highways and buildings, and is easy to rust due to the fact that the metal guardrail is exposed to wind and rain in outdoor environment for a long time and is exposed to sunlight, the whole structure of the guardrail is directly damaged by serious rust, economic loss is brought to human beings, personal safety is sometimes even endangered, and meanwhile, the protection of natural resources and environment is not facilitated. Of all the anticorrosion measures, organic coatings are by far the most effective, most economical and most commonly used. Two important factors causing the aging of the outdoor organic coating, one is the direct damage of the coating caused by the chain scission of the molecular chain of the organic polymer caused by photodegradation; the other is electrochemical corrosion caused by penetration of corrosive media. The microscopic defects exist in all coatings observed under a microscope, namely pinholes formed in the curing process of the coatings, holes in the structures and cavities generated by molecular vibration, corrosive media with low vapor pressure and small molecular radius such as water, oxygen and the like are easily diffused to the surface of the metal base material through the microscopic defects to form the corrosive media, the coating/metal surface is formed by the anode region and the cathode region due to the microscopic defects of the coatings and the nonuniformity of the metal surface, so that electrochemical corrosion occurs, the product is ferric oxide (rust), after one piece of iron is completely rusted, the volume can expand by 8 times, and along with the deepening of corrosion, the coating is peeled off by a large amount of expanded rust, and the service life of the guardrail is influenced. It can be seen that the high polymer film formed only by the organic resin cannot block the permeation of water and oxygen.
At present, the thickness of the powder coating for the outdoor metal guardrail is between 70 and 100 mu m, polyester resin with better ultraviolet resistance is adopted, although the ultraviolet resistance is more outstanding, the barrier capability to corrosive media is limited due to the problems of microscopic defects of a coating and the like, and the coating can generate bubbles and rust penetration in two to three years and can locally generate the falling-off phenomenon in four to five years in a general urban atmospheric corrosion environment. Thereby seriously affecting the decorative effect and the service life of the guardrail, and therefore, the improvement of the permeation resistance of the coating to corrosive media is the most important work.
At present, the outdoor anticorrosion powder coating is less, and generally, due to the process problem, ideal functional anticorrosion materials such as glass flakes, mica powder, mica iron oxide, stainless steel flakes and the like can hardly be applied. If the materials are directly mixed with components such as resin, pigments and fillers and the like and produced according to a normal powder preparation process, the materials can hardly maintain the original sheet structure finally, and the anti-corrosion effect is greatly reduced due to the change of the appearance. Therefore, the existing metal guardrail powder coating only plays a role in decoration and general protection, and the barrier and the shielding of a coating against a corrosive medium are limited, namely the corrosion resistance is weak. Therefore, the problem of coating aging caused by outdoor metal guardrail powder coating is mainly electrochemical corrosion caused by corrosion medium permeation.
Disclosure of Invention
The invention aims to overcome the defects of the prior production technology and provides an anticorrosive powder coating for an outdoor metal guardrail and a preparation process thereof.
In order to achieve the purpose, the invention adopts the technical scheme that: an anticorrosion powder coating for outdoor metal guardrails is prepared by mixing base powder and raw materials in a bonding machine in proportion and then sieving;
the base powder comprises the following components in parts by mass: 40-60 parts of carboxyl-terminated polyester, 3-5 parts of curing agent, 5-10 parts of titanium dioxide, 5-15 parts of precipitated barium sulfate, 0-2 parts of defoaming agent, 0.6-1.3 parts of flatting agent, 0.5-1.2 parts of brightener, 0.05-0.2 part of light stabilizer, 0-1 part of pigment and 0.2-1 part of coupling agent.
The raw materials comprise the following components in parts by weight: 0.1-0.5 part of bonding wax powder, 3-8 parts of glass flakes and 0.05-0.1 part of aluminum oxide C.
The preparation method of the anticorrosive powder coating for the outdoor guardrail comprises the following specific steps:
a. sequentially adding carboxyl-terminated polyester resin, a curing agent, titanium dioxide, precipitated barium sulfate, a defoaming agent, a leveling agent, a brightener, a light stabilizer, a pigment and a coupling agent into a mixer, and uniformly mixing and stirring;
b. delivering the mixed materials to an extruder through a feeder for melt mixing and dispersion extrusion, wherein the temperature of the extruder is controlled to be 115-105 ℃ in the area I and 90-80 ℃ in the area II;
c. the extruded materials are melted, mixed, pressed into flaky materials which are easy to crush by tabletting, cooling and rolling, and crushed into flaky materials by a crusher;
d. feeding the small-sized materials to an ACM (activated carbon model) mill through a material conveyor, finely crushing, and passing through a 180-mesh screen to prepare base powder;
e. adding the base powder into a bonding kettle, adding bonding wax powder when the temperature in the kettle reaches a preset temperature of 50-55 ℃, adding glass flakes when the temperature reaches 60-65 ℃, mixing and stirring for 4-6 minutes to bond sticky base powder particles with the glass flakes, adding alumina C, stirring for 0.5 minute, quickly conveying the powder into a cooling tank, cooling to room temperature, and finally sieving through a 140-mesh sieve to obtain the finished product.
The acid value of the carboxyl-terminated polyester resin is 20-35, the curing agent is TGIC, the titanium dioxide is rutile titanium dioxide, the defoaming agent is benzoin, the coupling agent is W-6050, the flatting agent is GLP288, the gloss enhancer is 701, and the light stabilizer is 144.
The manufacturing process mechanism of the invention is as follows: the binding (binding bonding) technology of the powder coating is to bind mica powder or metal powder on the bottom powder of the powder so that the coating has a metal effect; the technology is that glass flakes are bound on powder base powder, and after the glass flakes are solidified into a film, the anticorrosion powder coating containing the glass flakes for the outdoor metal guardrail can be prepared.
The specific process comprises the following steps: adding powder coating base powder into a bonding kettle with a temperature control jacket, and utilizing the high-speed rotation of machinery to generate friction due to different movement speeds between a stirring paddle and a material to be mixed in a short time, so that the temperature of the base powder is increased through frictional heat generation. When the temperature is close to the glass transition temperature (Tg) of resin, the base powder is softened and sticky, then the bonding wax powder and the glass flakes are successively added into the powder body rotating at high speed to make it adhere to the surface of the softened powder coating particles, then the alumina C is added, and the quick discharging and cooling treatment are implemented, so that the bonding technology of the powder coating is invented. The glass flakes and the bottom powder particles are completely bonded together by adopting the bonding technology, so that the flaky structure of the glass flakes and the bottom powder particles is maintained in a coating film, the shielding performance is fully exerted, the diffusion of a corrosive medium in the coating film is delayed, and the corrosion resistance of the outdoor powder coating is improved.
The invention has the beneficial effects that:
1. the formula selects corresponding film-forming components and functional fillers from two most important aspects of molecular chain degradation induced by ultraviolet rays causing outdoor coating aging and electrochemical corrosion induced by corrosive medium permeation, so that the weather resistance and the corrosion resistance of a coating film are obviously improved, the guardrail base material is effectively protected, and the service life of the guardrail base material is prolonged.
2. The coating takes carboxyl-terminated polyester resin with excellent weather resistance and TGIC as film forming components, resists ultraviolet irradiation in sunlight, greatly reduces the condition of molecular chain scission caused by photodegradation, and ensures the stability of the molecular state of the organic polymer.
3. The barrier raw material is glass flakes, the thickness of the barrier raw material is 2-5 mu m, the flake diameter is 10-30 mu m, the flake shape is bonded on the base powder through a bonding technology, the glass flakes are overlapped up and down in a coating film and are arranged layer by layer, a plurality of layers of glass flakes are arranged in the coating layer with the thickness of 100 mu m, a channel barrier is formed for a penetrating medium, so that a corrosive medium has to detour along a random bent path, the labyrinth effect is actually equal to thickening the coating layer, the time of the corrosive medium reaching a base material is prolonged, and the service life of the coating layer is prolonged.
3. The glass flakes distributed in the coating divide the resin into a plurality of small regions, so that microcracks and microbubbles in the coating are mutually divided, and the permeation of capillary action is inhibited. Because the scales are discontinuous dispersed fillers and are arranged in parallel in the resin, the interfacial porosity is divided into discontinuous dispersed holes, and the effect of a coupling agent bridge is added, so that the adhesive force between the surface of the scale and the resin is enhanced, the pores formed in the coating due to the interface are reduced, and the permeation caused by the pores caused by the interface is inhibited.
4. The dispersed scales divide the resin into thin resin layers, so that the shrinkage stress of resin curing is greatly reduced in each small range, the interface strength is correspondingly improved, and meanwhile, the harm of internal stress caused by different expansion coefficients of the resin and the influence of curing heat is reduced, so that the defects of conventional coatings are overcome by the scale coatings, and the long-acting anticorrosion effect is achieved.
5. The use of the defoaming agent can improve the microscopic defects of the coating; the glass flakes added by the bonding technology can prevent the penetration of corrosive media to the maximum extent.
Detailed Description
The technical solution of the present invention is further described below by specific examples.
Example 1: a preparation method of an anticorrosive powder coating for outdoor metal guardrails comprises the following steps: the method comprises the following steps:
47 kg of terminal carboxyl polyester with an acid value of 29, 3.5 kg of TGIC, 6 kg of rutile type titanium dioxide, 15 kg of precipitated barium sulfate, 0.9 kg of benzoin, 2880.9 kg of leveling agent GLP, 7010.7 kg of light-enhancing agent, 1440.15 kg of light stabilizer, 0.3 kg of phthalocyanine blue and 60500.8 kg of coupling agent are sequentially fed into a mixer, and the mixture is subjected to 300 revolutions per minute, mixing is carried out for 15 minutes, and stirring is carried out uniformly;
b. delivering the mixed materials to an extruder through a feeder for melt mixing and dispersion extrusion, wherein the temperature of the extruder is controlled to be 105 ℃ in the area I115 and 100-90 ℃ in the area II;
c. the extruded materials are melted, mixed, pressed into flaky materials which are easy to crush by tabletting, cooling and rolling, and crushed into flaky materials by a crusher;
d. feeding the small-sized materials to an ACM (activated carbon model) mill through a material conveyor, finely crushing, and passing through a 180-mesh screen to prepare base powder;
e. putting base powder into a bonding kettle, adding 0.4 kg of bonding wax powder when the temperature in the kettle reaches a preset temperature of 52 ℃, adding 4 kg of glass flakes when the temperature reaches 63 ℃, mixing and stirring for 4 minutes to bond the sticky base powder particles with the glass flakes, adding 0.1 kg of alumina C, stirring for 0.5 minute, rapidly conveying the powder into a cooling tank, cooling to room temperature, and finally sieving with a 140-mesh sieve to obtain a finished product.
The construction process comprises the following steps: electrostatic spraying is adopted, and baking and curing are carried out at 190 ℃ for 20 minutes.
Example 2: the preparation method is the same as that of the example 1 except that the weight of each component is as follows:
the base powder comprises the following components in parts by weight:
46 kg of terminal carboxyl polyester with an acid value of 25, 3.4 kg of TGIC, 6 kg of rutile type titanium dioxide, 12 kg of precipitated barium sulfate, 0.9 kg of benzoin, 2880.9 kg of leveling agent GLP, 7010.7 kg of light-intensifying agents, 1440.15 kg of light stabilizer, 0.2 kg of pigment phthalocyanine blue and 60500.8 kg of coupling agent.
The raw materials comprise the following components in parts by weight: and the adhesive comprises 0.4 kg of bonding wax powder, 4 kg of glass flakes and 0.1 kg of alumina C.
Example 3: the preparation method is the same as that of the example 1 except that the weight of each component is as follows:
the base powder comprises the following components in parts by weight:
45 kg of terminal carboxyl polyester with an acid value of 30, 3.3 kg of TGIC, 6 kg of rutile type titanium dioxide, 12 kg of precipitated barium sulfate, 0.9 kg of benzoin, 2880.9 kg of leveling agent GLP, 7010.7 kg of light-intensifying agents, 1440.15 kg of light stabilizers, 0.2 kg of phthalocyanine blue and 60500.8 kg of coupling agent.
The raw materials comprise the following components in parts by weight: and the adhesive comprises 0.4 kg of bonding wax powder, 4 kg of glass flakes and 0.1 kg of alumina C.
The results of the experiment are shown in the following table:
base material: cold-rolled steel sheet 1 mm, 75 mm, 100 mm and HG/T2006-9
(the impact strength adopts a tin plate of 50 mm, 120 mm, 0.3 mm and GB/T-9271)
As can be seen from the table above, the guardrail coating not only has the decorative performance of common guardrail coatings, but also has an excellent anticorrosion function.
The coating is a green environment-friendly coating without volatile organic compounds, a large number of glass flakes are overlapped and arranged in a coating film to form a fish scale effect, a protective layer which can block corrosive media from contacting can be formed on the surface of a guardrail, and the corrosion resistance of the guardrail is improved; the refractive index of the light-emitting material is greatly different from that of resin, and a large amount of ultraviolet rays can be reflected, so that the aging property of the resin is reduced, and the weather resistance and the service life of the guardrail are greatly prolonged. In recent years, with the rapid development of urban construction in China, the requirements of the market on guardrail products are higher and higher, whether guardrail coating is environment-friendly or not is gradually emphasized by people, and the using amount of powder coating for guardrails is larger and larger.
Claims (4)
1. The utility model provides an outdoor metal guardrail is with anticorrosive powder coating which characterized in that: is prepared by mixing base powder and raw materials in a bonding machine according to a certain proportion and sieving;
the base powder comprises the following components in parts by weight: 40-60 parts of carboxyl-terminated polyester, 3-5 parts of curing agent, 5-10 parts of titanium dioxide, 5-15 parts of precipitated barium sulfate, 0-2 parts of defoaming agent, 0.6-1.3 parts of flatting agent, 0.5-1.2 parts of brightener, 0.05-0.2 part of light stabilizer, 0-1 part of pigment and 0.2-1 part of coupling agent;
the raw materials consist of the following components in parts by weight: 0.1-0.5 part of bonding wax powder, 3-8 parts of glass flakes and 0.05-0.1 part of aluminum oxide C.
2. The preparation method of the anticorrosive powder coating for the outdoor metal guardrail, according to claim 1, is characterized by comprising the following specific steps:
a. sequentially adding carboxyl-terminated polyester resin, a curing agent, titanium dioxide, precipitated barium sulfate, a defoaming agent, a leveling agent, a brightener, a light stabilizer, a pigment and a coupling agent into a mixer, and uniformly mixing and stirring;
b. delivering the mixed materials to an extruder through a feeder for melt mixing and dispersion extrusion, wherein the temperature of the extruder is controlled to be 115-105 ℃ in the area I and 90-80 ℃ in the area II;
c. the extruded materials are melted, mixed, pressed into flaky materials which are easy to crush by tabletting, cooling and rolling, and crushed into flaky materials by a crusher;
d. feeding the small-sized materials to an ACM (activated carbon model) mill through a material conveyor, finely crushing, and passing through a 180-mesh screen to prepare base powder;
e. adding the base powder into a bonding kettle, adding bonding wax powder when the temperature in the kettle reaches a preset temperature of 50-55 ℃, adding glass flakes when the temperature reaches 60-65 ℃, mixing and stirring for 4-6 minutes to bond sticky base powder particles with the glass flakes, adding alumina C, stirring for 0.5 minute, quickly conveying the powder into a cooling tank, cooling to room temperature, and finally sieving through a 140-mesh sieve to obtain the finished product.
3. The anticorrosive powder coating for outdoor metal guardrails according to claim 1, characterized in that: the acid value of the carboxyl-terminated polyester resin is 20-35.
4. The anticorrosive powder coating for outdoor metal guardrails according to claim 1, characterized in that: the curing agent is TGIC, the titanium dioxide is rutile titanium dioxide, the defoaming agent is benzoin, the coupling agent is W-6050, the leveling agent is GLP288, the gloss enhancer is a gloss enhancer 701, and the light stabilizer is a stabilizer 144.
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| CN201911088712.2A CN110684443A (en) | 2019-11-08 | 2019-11-08 | Anticorrosive powder coating for outdoor metal guardrail and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113185894A (en) * | 2021-04-29 | 2021-07-30 | 甘肃西部邦奇装饰材料科技有限公司 | Toughening type steel bar anticorrosion powder coating and preparation method thereof |
| CN114574072A (en) * | 2022-03-18 | 2022-06-03 | 广东腐蚀科学与技术创新研究院 | Nano powder coating and preparation method and application thereof |
| CN116790179A (en) * | 2023-06-20 | 2023-09-22 | 河北汉光重工有限责任公司 | Preparation method of metal powder coating |
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