A high-efficiency release and corrosion-resistant powder coating for building concrete formwork

Abstract

This invention relates to a high-efficiency release and corrosion-resistant powder coating for concrete formwork, belonging to the field of coating technology. Based on the property that dopamine self-polymerizes to form polydopamine under alkaline and aerobic conditions, this invention allows for the organic self-polymerization and coating of nano-silica. A certain amount of zinc chloride solution is then added, utilizing the catechol structure of polydopamine to chelate zinc ions. Finally, the coating is modified with a modifier formed by the interaction of hydroxyl groups and -NCO groups of propyl isocyanate-3-(triethoxysilyl)propyl and N-(2-hydroxyethyl)trifluoroacetamide, grafting carbon-fluorine bonds to prepare a modified filler. When mixed with other components, the resulting powder coating, when applied to concrete formwork, not only imparts excellent corrosion resistance, making it less susceptible to concrete erosion, but also exhibits good wear resistance, low surface energy, hydrophobicity, and easy release properties, and the coating remains undamaged even after repeated use.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to a high-efficiency release and corrosion-resistant powder coating for building concrete formwork. Background Technology

[0002] Formwork is a temporary support structure that allows concrete structures to be shaped according to specified positions and geometric dimensions. It offers numerous advantages such as simple operation and rapid construction, and is widely used in building construction. However, since most current formwork is made of aluminum, and concrete slurry has complex components and is characterized by high moisture and high alkali, it is highly susceptible to corrosion and erosion during actual use, leading to damage and preventing repeated reuse, thus significantly reducing economic benefits. To address this technical problem, many existing technologies involve spraying a powder coating onto the surface of the aluminum formwork to create a coating that provides excellent corrosion resistance to concrete. However, these existing technologies still have many drawbacks that limit their practical application. This is because the process of removing the formwork during construction involves significant friction, which can easily cause irreversible damage to the coating, resulting in scratches and cracks, rendering the intended corrosion resistance negligible. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a high-efficiency release and corrosion-resistant powder coating for building concrete formwork. This invention is based on the property that dopamine self-polymerizes to form polydopamine under alkaline and aerobic conditions, allowing it to organically encapsulate nano-silica. Then, a certain amount of zinc chloride solution is added, utilizing the catechol structure of polydopamine to chelate zinc ions. Finally, it is modified with a modifier formed by the interaction of 3-(triethoxysilyl)propyl isocyanate and N-(2-hydroxyethyl)trifluoroacetamide through the action of hydroxyl and -NCO groups, grafting carbon-fluorine bonds to prepare a modified filler. When this powder coating is mixed with other components and applied to building formwork, it not only imparts excellent corrosion resistance, making it less susceptible to concrete erosion, but also possesses good wear resistance, low surface energy, hydrophobic / easy-release properties, and the coating remains undamaged even after multiple cycles of use.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A high-efficiency release and corrosion-resistant powder coating for building concrete formwork, wherein the high-efficiency release and corrosion-resistant powder coating is prepared from 90-100 parts by weight of polyester resin, 5-7 parts by weight of modified filler, 7-10 parts by weight of curing agent, 1-1.5 parts by weight of benzoin and 0.5-0.7 parts by weight of leveling agent.

[0006] As a preferred embodiment of the present invention, the polyester resin is obtained by purchasing it directly from the market.

[0007] As a preferred embodiment of the present invention, the modified filler is prepared by the following steps:

[0008] Step a: Add 5-7 parts by weight of nano-silica to 120-150 parts by weight of Tris-hydrochloric acid buffer, stir at room temperature for 5-10 minutes to mix, then add 10-12 parts by weight of dopamine, and stir at 25-30°C for 22-26 hours in an ultrasonic bath with a power of 200-400W while ensuring contact with air. Filter, remove the filtrate, wash with deionized water, and finally vacuum dry at 50-80°C until constant weight to obtain polydopamine-coated nano-silica.

[0009] Step b: Add the polydopamine-coated nano-silica to 100-120 parts by weight of deionized water, and then add 1-1.5 parts by weight of zinc chloride solution dropwise while stirring at room temperature. After the addition is complete, continue stirring at a constant temperature for 2-4 hours to mix, filter, remove the filtrate, wash with deionized water, and finally vacuum dry at 50-80℃ until constant weight to obtain zinc ion modified polydopamine-coated nano-silica;

[0010] Step c: Add 4-5 parts by weight of 3-(triethoxysilyl)propyl isocyanate, 5-7 parts by weight of N-(2-hydroxyethyl)trifluoroacetamide and 0.5-0.8 parts by weight of triethylamine to 80-100 parts by weight of dimethyl sulfoxide, then stir at 120-140°C for 12-14 hours under a nitrogen atmosphere, cool naturally to room temperature, seal and store to obtain mixture a;

[0011] Step d: Add the zinc ion modified polydopamine-coated nano silica and 1-2 parts by weight of deionized water to the mixture a, then stir at 100-120℃ for 10-12h, filter, remove the filtrate, wash with deionized water, and finally vacuum dry at 50-80℃ until constant weight, thus completing the preparation.

[0012] Furthermore, the pH of the Tris-hydrochloric acid buffer solution described in step a is 8.

[0013] Furthermore, the particle size of the nano-silica in step a is 30-60 nm.

[0014] Furthermore, the dripping rate described in step b is controlled at 1-2 drops / s.

[0015] Furthermore, the concentration of the zinc chloride solution in step b is 0.5-1 mol / L.

[0016] Furthermore, the flow rate of the nitrogen atmosphere in step c is 100-150 mL / min.

[0017] As a preferred embodiment of the present invention, the curing agent is triglycidyl isocyanurate.

[0018] As a preferred embodiment of the present invention, the leveling agent is obtained by purchasing directly from the market.

[0019] A method for preparing a high-efficiency release and corrosion-resistant powder coating for building concrete formwork, the method comprising the following steps:

[0020] Step A: Polyester resin and modified filler are compounded and extruded using a screw extruder, and then naturally cooled to room temperature to obtain a premix.

[0021] Step B: Mix the premix, curing agent, benzoin and leveling agent at room temperature for 5-10 minutes, pulverize, pass through a 200-300 mesh sieve, and continue mixing at room temperature for 10-15 minutes to complete the preparation.

[0022] As a preferred technical solution of the present invention, the operating parameters of the screw extruder in step A are: zone one temperature controlled at 120°C, zone two temperature controlled at 115°C, frequency controlled at 50Hz, and rotation speed controlled at 100rpm.

[0023] The high-efficiency release and corrosion-resistant powder coating prepared by the present invention is applied by an electrostatic spray gun, then cured at 180°C for 20 minutes, and naturally cooled to room temperature to form a coating.

[0024] The beneficial effects of this invention are:

[0025] (1) This invention is based on the property that dopamine will self-polymerize to form polydopamine under alkaline and aerobic conditions, so as to make it to organically self-polymerize and coat nano-silica. Then, a certain amount of zinc chloride solution is added, and zinc ions are chelated by the catechol structure of polydopamine. Finally, it is modified by a modifier formed by the action of hydroxyl and -NCO of isocyanate-3-(triethoxysilyl)propyl ester and N-(2-hydroxyethyl)trifluoroacetamide, and carbon-fluorine bonds are grafted on to prepare a modified filler. When the powder coating formed by mixing it with other components is applied to the spraying of building templates, it not only gives the building templates excellent corrosion resistance and is not easily eroded by concrete, but also has good wear resistance, low surface energy, hydrophobic / easy demolding properties, and the coating is not damaged after multiple cycles of use.

[0026] (2) This invention creatively utilizes the property that dopamine self-polymerizes to form polydopamine under alkaline and aerobic conditions to encapsulate nano-silica with organic self-polymerization. Nano-silica, as a typical nanopowder material, can significantly improve the hardness of coatings after being added to them, thereby promoting wear resistance and preventing damage from friction. Furthermore, it can also exert a shielding and blocking effect, forming a "maze effect" that effectively extends the diffusion path of corrosive media. Simultaneously, polydopamine, an organic compound containing numerous benzene rings and hydroxyl groups, not only provides a platform for subsequent modification treatment and improves the dispersibility of nanomaterials in organic systems after encapsulating nano-silica, but also synergistically enhances the effect of nano-silica. The barrier effect is further enhanced by the strong steric hindrance effect of the benzene ring in its structure. When zinc chloride solution is added, a certain number of zinc ions can be chelated. From an electrochemical perspective, zinc ions can provide anodic protection, thereby delaying corrosion efficiency and improving corrosion resistance. Finally, the coating is modified by adding a modifier prepared from 3-(triethoxysilyl)propyl isocyanate and N-(2-hydroxyethyl)trifluoroacetamide to achieve hydrophobic and easy-to-release properties. The alkoxy group of the modifier allows it to interact with the hydroxyl groups of polydopamine to achieve the grafting of carbon-fluorine bonds. The low surface energy of carbon-fluorine bonds imparts hydrophobicity and easy-to-release properties. The coating is not easily damaged during repeated use, further promoting corrosion resistance.

[0027] (3) The high-efficiency release and corrosion-resistant powder coating prepared by the present invention can be applied to the spraying of various building templates containing metal elements. It has strong versatility, excellent corrosion resistance, and the building templates can be recycled multiple times without the coating being damaged. It has a very good application prospect. Detailed Implementation

[0028] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0029] The polyester resins used in all embodiments and comparative examples of this invention were purchased directly from the market, specifically Allnex's Zinxin polyester resin. 2437-2; The leveling agent was purchased directly from the market from Ningbo Nanhai Chemical Co., Ltd., model GLP388.

[0030] Example 1

[0031] A high-efficiency release and corrosion-resistant powder coating for building concrete formwork is prepared from 90 parts by weight of polyester resin, 5 parts by weight of modified filler, 7 parts by weight of curing agent, 1 part by weight of benzoin and 0.5 parts by weight of leveling agent.

[0032] The polyester resin was obtained by purchasing it directly from the market.

[0033] The modified filler is prepared by the following steps:

[0034] Step a: Add 5 parts by weight of nano-silica to 120 parts by weight of Tris-hydrochloric acid buffer, stir at room temperature for 5 minutes to mix, then add 10 parts by weight of dopamine, and stir at 25°C for 22 hours under ultrasound with a power of 200W while ensuring contact with air. Filter, remove the filtrate, wash with deionized water, and finally vacuum dry at 50°C until constant weight to obtain polydopamine-coated nano-silica.

[0035] Step b: Add the polydopamine-coated nano-silica to 100 parts by weight of deionized water, and then add 1 part by weight of zinc chloride solution dropwise while stirring at room temperature. After the addition is complete, continue stirring at a constant temperature for 2 hours to mix, filter, remove the filtrate, wash with deionized water, and finally vacuum dry at 50°C until constant weight to obtain zinc ion modified polydopamine-coated nano-silica.

[0036] Step c: Add 4 parts by weight of 3-(triethoxysilyl)propyl isocyanate, 5 parts by weight of N-(2-hydroxyethyl)trifluoroacetamide and 0.5 parts by weight of triethylamine to 80 parts by weight of dimethyl sulfoxide, then stir at 120°C for 12 hours under a nitrogen atmosphere, cool naturally to room temperature, seal and store to obtain mixture a.

[0037] Step d: Add the zinc ion modified polydopamine-coated nano silica and 1 part by weight of deionized water to the mixture a, then stir at 100°C for 10 h, filter, remove the filtrate, wash with deionized water, and finally vacuum dry at 50°C until constant weight, thus completing the preparation.

[0038] The pH of the Tris-hydrochloric acid buffer solution described in step a is 8.

[0039] The particle size of the nano-silica in step a is 30 nm.

[0040] The dripping rate described in step b is controlled at 1 drop / s.

[0041] The concentration of the zinc chloride solution in step b is 0.5 mol / L.

[0042] The flow rate of the nitrogen atmosphere in step c is 100 mL / min.

[0043] The curing agent is triglycidyl isocyanurate.

[0044] The leveling agent was obtained by purchasing directly from the market.

[0045] A method for preparing a high-efficiency release and corrosion-resistant powder coating for building concrete formwork, the method comprising the following steps:

[0046] Step A: Polyester resin and modified filler are compounded and extruded using a screw extruder, and then naturally cooled to room temperature to obtain a premix.

[0047] Step B: Mix the premix, curing agent, benzoin and leveling agent at room temperature for 5 minutes, pulverize, pass through a 200-mesh sieve, and continue mixing at room temperature for 10 minutes to complete the preparation.

[0048] The operating parameters of the screw extruder described in step A are: zone 1 temperature controlled at 120℃, zone 2 temperature controlled at 115℃, frequency controlled at 50Hz, and speed controlled at 100rpm.

[0049] Example 2

[0050] A high-efficiency release and corrosion-resistant powder coating for building concrete formwork is prepared from 100 parts by weight of polyester resin, 7 parts by weight of modified filler, 10 parts by weight of curing agent, 1.5 parts by weight of benzoin and 0.7 parts by weight of leveling agent.

[0051] The polyester resin was obtained by purchasing it directly from the market.

[0052] The modified filler is prepared by the following steps:

[0053] Step a: Add 7 parts by weight of nano-silica to 150 parts by weight of Tris-hydrochloric acid buffer, stir at room temperature for 10 min to mix, then add 12 parts by weight of dopamine, and stir at 30°C for 26 h in an ultrasonic bath at 400W while ensuring contact with air. Filter, remove the filtrate, wash with deionized water, and finally vacuum dry at 80°C until constant weight to obtain polydopamine-coated nano-silica.

[0054] Step b: Add the polydopamine-coated nano-silica to 120 parts by weight of deionized water, and then add 1.5 parts by weight of zinc chloride solution dropwise while stirring at room temperature. After the addition is complete, continue stirring at a constant temperature for 4 hours to mix, filter, remove the filtrate, wash with deionized water, and finally vacuum dry at 80°C until constant weight to obtain zinc ion modified polydopamine-coated nano-silica.

[0055] Step c: Add 5 parts by weight of 3-(triethoxysilyl)propyl isocyanate, 7 parts by weight of N-(2-hydroxyethyl)trifluoroacetamide and 0.8 parts by weight of triethylamine to 100 parts by weight of dimethyl sulfoxide, then stir at 140°C for 14 hours under a nitrogen atmosphere, cool naturally to room temperature, seal and store to obtain mixture a;

[0056] Step d: Add the zinc ion modified polydopamine-coated nano silica and 2 parts by weight of deionized water to the mixture a, then stir at 120°C for 12 hours, filter, remove the filtrate, wash with deionized water, and finally vacuum dry at 80°C until constant weight, thus completing the preparation.

[0057] The pH of the Tris-hydrochloric acid buffer solution described in step a is 8.

[0058] The particle size of the nano-silica in step a is 60 nm.

[0059] The dripping rate described in step b is controlled at 2 drops / s.

[0060] The concentration of the zinc chloride solution in step b is 1 mol / L.

[0061] The flow rate of the nitrogen atmosphere in step c is 150 mL / min.

[0062] The curing agent is triglycidyl isocyanurate.

[0063] The leveling agent was obtained by purchasing directly from the market.

[0064] A method for preparing a high-efficiency release and corrosion-resistant powder coating for building concrete formwork, the method comprising the following steps:

[0065] Step A: Polyester resin and modified filler are compounded and extruded using a screw extruder, and then naturally cooled to room temperature to obtain a premix.

[0066] Step B: Mix the premix, curing agent, benzoin and leveling agent at room temperature for 10 minutes, pulverize, pass through a 300-mesh sieve, and continue mixing at room temperature for 15 minutes to complete the preparation.

[0067] The operating parameters of the screw extruder described in step A are: zone 1 temperature controlled at 120℃, zone 2 temperature controlled at 115℃, frequency controlled at 50Hz, and speed controlled at 100rpm.

[0068] Example 3

[0069] A high-efficiency release and corrosion-resistant powder coating for building concrete formwork is prepared from 95 parts by weight of polyester resin, 6 parts by weight of modified filler, 9 parts by weight of curing agent, 1.3 parts by weight of benzoin and 0.6 parts by weight of leveling agent.

[0070] The polyester resin was obtained by purchasing it directly from the market.

[0071] The modified filler is prepared by the following steps:

[0072] Step a: Add 6 parts by weight of nano-silica to 140 parts by weight of Tris-hydrochloric acid buffer, stir at room temperature for 8 minutes to mix, then add 11 parts by weight of dopamine, and stir at 28°C for 24 hours under ultrasound with a power of 300W while ensuring contact with air. Filter, remove the filtrate, wash with deionized water, and finally vacuum dry at 70°C until constant weight to obtain polydopamine-coated nano-silica.

[0073] Step b: Add the polydopamine-coated nano-silica to 110 parts by weight of deionized water, and then add 1.3 parts by weight of zinc chloride solution dropwise while stirring at room temperature. After the addition is complete, continue stirring at a constant temperature for 3 hours to mix, filter, remove the filtrate, wash with deionized water, and finally vacuum dry at 60°C until constant weight to obtain zinc ion modified polydopamine-coated nano-silica;

[0074] Step c: Add 4.5 parts by weight of 3-(triethoxysilyl)propyl isocyanate, 6 parts by weight of N-(2-hydroxyethyl)trifluoroacetamide and 0.7 parts by weight of triethylamine to 90 parts by weight of dimethyl sulfoxide, then stir at 130°C for 13 hours under a nitrogen atmosphere, cool naturally to room temperature, seal and store to obtain mixture a;

[0075] Step d: Add the zinc ion modified polydopamine-coated nano silica and 1.5 parts by weight of deionized water to the mixture a, then stir at 110°C for 11 hours, filter, remove the filtrate, wash with deionized water, and finally vacuum dry at 70°C until constant weight, thus completing the preparation.

[0076] The pH of the Tris-hydrochloric acid buffer solution described in step a is 8.

[0077] The particle size of the nano-silica in step a is 50 nm.

[0078] The dripping rate described in step b is controlled at 1.5 drops / s.

[0079] The concentration of the zinc chloride solution in step b is 0.8 mol / L.

[0080] The flow rate of the nitrogen atmosphere in step c is 130 mL / min.

[0081] The curing agent is triglycidyl isocyanurate.

[0082] The leveling agent was obtained by purchasing directly from the market.

[0083] A method for preparing a high-efficiency release and corrosion-resistant powder coating for building concrete formwork, the method comprising the following steps:

[0084] Step A: Polyester resin and modified filler are compounded and extruded using a screw extruder, and then naturally cooled to room temperature to obtain a premix.

[0085] Step B: Mix the premix, curing agent, benzoin and leveling agent at room temperature for 8 minutes, pulverize, pass through a 250-mesh sieve, and continue mixing at room temperature for 13 minutes to complete the preparation.

[0086] The operating parameters of the screw extruder described in step A are: zone 1 temperature controlled at 120℃, zone 2 temperature controlled at 115℃, frequency controlled at 50Hz, and speed controlled at 100rpm.

[0087] Comparative Example 1

[0088] Based on Example 1, step b is omitted, and the zinc ion modified polydopamine-coated nano silica in step d is replaced with polydopamine-coated nano silica, while the rest remain unchanged.

[0089] Comparative Example 2

[0090] Based on Example 1, N-(2-hydroxyethyl)trifluoroacetamide was not added in step c, and all other steps remained unchanged.

[0091] Comparative Example 3

[0092] Based on Example 1, steps b, c, and d are omitted, while the rest remain unchanged.

[0093] Comparative Example 4

[0094] Based on Example 1, in step a, 10 parts by weight of dopamine were replaced with 7 parts by weight of dopamine, while the rest remained unchanged.

[0095] Test Example 1

[0096] Corrosion resistance test:

[0097] The high-efficiency release and corrosion-resistant powder coatings prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to alkali resistance tests according to standard GB / T9265-2009. The substrate of the test plates was asbestos-free fiber cement flat plate as specified in the standard, and the coating thickness was 50 μm (sprayed using an electrostatic spray gun, then cured at 180°C for 20 min, and naturally cooled to room temperature to form the coating).

[0098] The high-efficiency release and corrosion-resistant powder coatings prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to salt spray resistance tests according to standard GB / T1771-2007. The substrate was cold-rolled steel plate, and the coating thickness was 50 μm (sprayed using an electrostatic spray gun, cured at 180°C for 20 min, and then naturally cooled to room temperature to form the coating).

[0099] Table 1. Corrosion resistance test results

[0100]

[0101]

[0102] Test Example 2

[0103] Cyclic use test:

[0104] The high-efficiency release and corrosion-resistant powder coatings prepared in Examples 1-3 and Comparative Examples 1-4 were sprayed onto the surface of aluminum alloy templates to form a coating with a thickness of 50 μm (sprayed using an electrostatic spray gun, then cured at 180°C for 20 min, and naturally cooled to room temperature to form the coating). The aluminum alloy templates with the coating were then repeatedly poured with concrete, solidified and hardened, and demolded. After this cycle was repeated 50 times, the coating was observed to see if scratches or cracks appeared.

[0105] Table 2. Results of Cyclic Use Test

[0106] Are there any scratches or cracks? Example 1 no Example 2 no Example 3 no Comparative Example 1 no Comparative Example 2 yes Comparative Example 3 yes Comparative Example 4 no

[0107] A comparison of Example 1 and Comparative Examples 1-4 shows that:

[0108] The difference between Comparative Example 1 and Example 1 is that a certain number of zinc ions were not chelated.

[0109] The difference between Comparative Example 2 and Example 1 is that no carbon-fluorine bonds were formed.

[0110] The difference between Comparative Example 3 and Example 1 is that: Polydopamine-coated nano-silica is directly used as a modified filler.

[0111] The difference between Comparative Example 4 and Example 1 is that fewer structures form polydopamine coatings.

[0112] As can be seen from the comparison of Example 1, Comparative Examples 1-4 and Test Example 1, the high-efficiency release and corrosion-resistant powder coating prepared by the present invention has excellent corrosion resistance.

[0113] A comparison of Examples 1, Comparative Examples 1-4, and Test Example 2 shows that the high-efficiency release and corrosion-resistant powder coating prepared by the present invention can achieve high efficiency and easy release when applied to the spraying of building templates, ensuring that the coating is not easily damaged during repeated use.

[0114] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high performance release corrosion resistant powder coating for architectural concrete forms, characterized by: The high-efficiency demolding corrosion-resistant powder coating is prepared from 90-100 parts by weight of polyester resin, 5-7 parts by weight of modified filler, 7-10 parts by weight of curing agent, 1-1.5 parts by weight of benzoin and 0.5-0.7 parts by weight of leveling agent. The modified filler is prepared by the following steps: Step a: 5-7 parts by weight of nanosilica is added to 120-150 parts by weight of Tris-hydrochloric acid buffer, stirred at room temperature for 5-10 min, then 10-12 parts by weight of dopamine is added, and stirred at 25-30°C in ultrasonic power of 200-400W for 22-26h, filtered, the filtrate is removed, washed with deionized water, and finally vacuum dried at 50-80°C until constant weight to obtain polydopamine-coated nanosilica; Step b: the polydopamine-coated nanosilica is added to 100-120 parts by weight of deionized water, then 1-1.5 parts by weight of zinc chloride solution is added dropwise while stirring at room temperature, and after the dropwise addition is completed, the mixture is continuously stirred at constant temperature for 2-4h, filtered, the filtrate is removed, washed with deionized water, and finally vacuum dried at 50-80°C until constant weight to obtain zinc ion modified polydopamine-coated nanosilica; Step c: 4-5 parts by weight of 3-(triethoxysilyl)propyl isocyanate, 5-7 parts by weight of N-(2-hydroxyethyl)trifluoroacetamide and 0.5-0.8 parts by weight of triethylamine are added to 80-100 parts by weight of dimethyl sulfoxide, then stirred at 120-140°C under nitrogen atmosphere for 12-14h, naturally cooled to room temperature, and sealed for storage to obtain mixture a; Step d: the zinc ion modified polydopamine-coated nanosilica and 1-2 parts by weight of deionized water are added to the mixture a, then stirred at 100-120°C for 10-12h, filtered, the filtrate is removed, washed with deionized water, and finally vacuum dried at 50-80°C until constant weight.

2. A high performance release corrosion resistant powder coating for building concrete formworks according to claim 1, characterized in that: The polyester resin is directly purchased from the market.

3. A high performance release corrosion resistant powder coating for building concrete formworks as claimed in claim 1, wherein: The pH of the Tris-hydrochloric acid buffer in step a is 8.

4. A high performance release corrosion resistant powder coating for building concrete formworks as claimed in claim 1, wherein: The particle size of the nanosilica in step a is 30-60nm.

5. A high performance release corrosion resistant powder coating for building concrete formworks as claimed in claim 1, wherein: The dropwise addition rate in step b is controlled at 1-2 drops / s.

6. A high performance release corrosion resistant powder coating for building concrete formworks as claimed in claim 1, wherein: The concentration of the zinc chloride solution in step b is 0.5-1mol / L.

7. A high performance release corrosion resistant powder coating for building concrete formworks as claimed in claim 1, wherein: The curing agent is isocyanuric acid triglycidyl ester.

8. A high performance release corrosion resistant powder coating for building concrete formworks as claimed in claim 1, wherein: The leveling agent is directly purchased from the market.

9. A process for the production of a high performance release corrosion resistant powder coating for architectural concrete formwork as claimed in any one of claims 1 to 8 characterised in that: The preparation method comprises the following steps: Step A: the polyester resin and the modified filler are mixed and extruded by a screw extruder, naturally cooled to room temperature to obtain a premix; Step B: the premix, the curing agent, the benzoin and the leveling agent are stirred at room temperature for 5-10 min, crushed, sieved through a 200-300 mesh screen, and continuously stirred at room temperature for 10-15 min, and the preparation is completed.

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