A high impact and weather-resistant polyester TGIC type powder coating and preparation method thereof

Abstract

The present invention relates to a high impact-resistant and weather-resistant polyester TGIC type powder coating, which comprises, by weight: 35-100 parts of polyester resin, 2-4 parts of methyl methacrylate, 1-3 parts of triethylenetetramine, 2-4 parts of nano titanium dioxide, 1-5 parts of curing agent T105, 1-4 parts of polybutyl acrylate, 0.1-1 part of acrylic resin, 0.1-1 part of sulfur, 1-2 parts of dispersant, 1-2 parts of leveling agent, 1-2 parts of antioxidant, 4-20 parts of low-temperature accelerator, and 1-5 parts of saturated fatty acid. The present invention also relates to a preparation method of the high impact-resistant and weather-resistant polyester TGIC type powder coating, and the prepared polyester TGIC type powder coating has high impact resistance and weather resistance, good adhesion, good mechanical properties, smooth coating film, high gloss, chemical resistance and corrosion resistance, and higher storage stability and shelf life.

Description

Technical Field

[0001] The invention relates to the technical field of powder coating preparation, in particular to a high-impact and weather-resistant polyester TGIC type powder coating and a preparation method thereof. Background Art

[0002] Polyester TGIC powder coating is a powder coating made of polyester resin modified by TGIC curing agent. This coating generates linear or slightly branched polymer compounds through esterification polycondensation reaction, and has excellent weather resistance, UV resistance and chemical resistance. Polyester TGIC powder coating is mainly composed of polyester resin, TGIC curing agent, pigments and fillers and additives. Among them, polyester resin and TGIC curing agent are the main film-forming substances, which play a decisive role in the performance of coatings. TGIC curing agent has a polyepoxide structure and can cross-link with polyester resin to form a three-dimensional network structure, thereby improving the heat resistance and weather resistance of the coating. Polyester TGIC powder coating is widely used in coating fields that need to withstand extreme climate and temperature changes due to its excellent performance. For example, building curtain walls, outdoor furniture, automotive parts, etc. require long-term weather-resistant exterior coating. In addition, due to its good weather resistance and UV resistance, it is also suitable for coating outdoor equipment and facilities.

[0003] Polyester powder coatings have problems such as poor heat resistance, poor UV resistance, insufficient coating hardness and poor electrical properties under certain environments. These problems limit their application in high temperature and high UV environments.

[0004] Therefore, it is desired to provide a high impact and weather-resistant polyester TGIC type powder coating and a preparation method thereof, which can solve the above technical problems. Summary of the invention

[0005] The first object of the present invention is to provide a high impact and weather resistant polyester TGIC type powder coating, which comprises, by weight:

[0006] 35-100 parts of polyester resin, 2-4 parts of methyl methacrylate, 1-3 parts of triethylenetetramine, 2-4 parts of nano titanium dioxide, 1-5 parts of curing agent T105, 1-4 parts of polybutyl acrylate, 0.1-1 parts of acrylic resin, 0.1-1 parts of sulfur, 1-2 parts of dispersant, 1-2 parts of leveling agent, 1-2 parts of antioxidant, 4-20 parts of low-temperature accelerator, and 1-5 parts of saturated fatty acid.

[0007] The second object of the present invention is to provide a method for preparing a high impact and weather-resistant polyester TGIC type powder coating, comprising the following steps:

[0008] S1, adding methyl methacrylate to methanol and mixing evenly to obtain a premixed solution; adding triethylenetetramine to a reactor, adding a dispersant and stirring until all dissolved, adding the premixed solution and stirring, and stirring to obtain a hyperbranched polymer;

[0009] S2, adding nano-titanium dioxide into water, dispersing by ultrasonic, adding hyperbranched polymer, and ultrasonically treating at 60-100° C. for 2-4 h to obtain a grafted polymer;

[0010] S3. Add polyester resin, curing agent T105, polybutyl acrylate, acrylic resin, sulfur, leveling agent, antioxidant, low-temperature accelerator and saturated fatty acid into a high-speed mixer and stir, then cool to room temperature and take out the mixture, add it into a screw extruder, melt extrude, tablet, crush and sieve to obtain corrosion-resistant pure polyester powder coating.

[0011] Specifically, in step S1, methyl methacrylate is added to methanol and mixed evenly to obtain a premixed liquid; triethylenetetramine is added to a reactor, a dispersant is added and stirred until completely dissolved, the premixed liquid is added and stirred at 2 to 6° C., the temperature is raised to 70 to 100° C. and stirred to obtain a hyperbranched polymer.

[0012] Specifically, in step S2, nano titanium dioxide is added to water, ultrasonically dispersed for 10 to 20 minutes, the pH of the system is adjusted to 5 to 7, a hyperbranched polymer is added, and ultrasonic treatment is performed at 60 to 100° C. for 5 to 7 hours to obtain a grafted polymer.

[0013] Furthermore, in step S3, polyester resin, curing agent T105, polybutyl acrylate, acrylic resin, sulfur, dispersant, leveling agent, antioxidant, low-temperature accelerator, and saturated fatty acid are added to a high-speed mixer and stirred at 80-90° C. for 1-2 hours, and the grafted polymer is added and stirred for 20-40 minutes. After cooling to room temperature, the mixture is taken out and added to a screw extruder, melt-extruded, tableted, crushed, and sieved to obtain a corrosion-resistant pure polyester powder coating.

[0014] Furthermore, in step S3, the particles are crushed to a particle size of 10 to 60 μm.

[0015] Furthermore, in step S1, the dispersant is a silicate dispersant, a polyphosphate or a carbonate dispersant.

[0016] Furthermore, the leveling agent is an acrylic leveling agent, an organic silicon leveling agent or a leveling auxiliary agent.

[0017] Specifically, in step S3, the steel is heated to 900°C at a heating rate of 5-8°C per minute and kept at this temperature for 20-30 minutes; then the steel is heated to 1000°C and kept at this temperature for 60-80 minutes before being taken out for quenching.

[0018] Specifically, after step S3, scanning analysis is also included, in which a scanning electron microscope is used to scan the surface of the sample point by point and line by line to obtain the crystallographic orientation of each point in the micro-region.

[0019] The high impact and weather-resistant polyester TGIC type powder coating and the preparation method thereof of the present invention have the following advantages compared with the prior art:

[0020] (1) The prepared polyester TGIC type powder coating has high impact resistance and weather resistance, good adhesion, excellent mechanical properties, smooth coating, high gloss, chemical and corrosion resistance, and higher storage stability and shelf life;

[0021] (2) The production process is simplified and highly efficient and energy-saving. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with specific embodiments.

[0023] Example 1

[0024] A high impact-resistant and weather-resistant polyester TGIC type powder coating, comprising, by weight:

[0025] 35 parts of polyester resin, 3 parts of methyl methacrylate, 2 parts of triethylenetetramine, 4 parts of nano titanium dioxide, 2 parts of curing agent T105, 2 parts of polybutyl acrylate, 0.3 parts of acrylic resin, 0.2 parts of sulfur, 2 parts of dispersant, 2 parts of leveling agent, 2 parts of antioxidant, 5 parts of low temperature accelerator, and 2 parts of saturated fatty acid.

[0026] A method for preparing a high impact-resistant and weather-resistant polyester TGIC type powder coating comprises the following steps:

[0027] S1, adding methyl methacrylate to methanol and mixing evenly to obtain a premixed solution; adding triethylenetetramine to a reactor, adding a dispersant and stirring until all dissolved, adding the premixed solution and stirring, and stirring to obtain a hyperbranched polymer;

[0028] S2, adding nano-titanium dioxide into water, dispersing by ultrasonic, adding hyperbranched polymer, and ultrasonically treating at 60-100° C. for 2-4 h to obtain a grafted polymer;

[0029] S3. Add polyester resin, curing agent T105, polybutyl acrylate, acrylic resin, sulfur, leveling agent, antioxidant, low-temperature accelerator and saturated fatty acid into a high-speed mixer and stir, then cool to room temperature and take out the mixture, add it into a screw extruder, melt extrude, tablet, crush and sieve to obtain corrosion-resistant pure polyester powder coating.

[0030] In this embodiment, in step S1, methyl methacrylate is added to methanol and mixed evenly to obtain a premixed liquid; triethylenetetramine is added to a reactor, a dispersant is added and stirred until all dissolved, the premixed liquid is added and stirred at 3°C, and the temperature is raised to 70°C and stirred to obtain a hyperbranched polymer.

[0031] In this embodiment, in step S2, nano titanium dioxide is added to water, ultrasonically dispersed for 12 minutes, the pH of the system is adjusted to 5, a hyperbranched polymer is added, and ultrasonic treatment is performed at 60° C. for 5 hours to obtain a grafted polymer.

[0032] Example 2

[0033] A high impact-resistant and weather-resistant polyester TGIC type powder coating, comprising, by weight:

[0034] 50 parts of polyester resin, 3 parts of methyl methacrylate, 3 parts of triethylenetetramine, 3 parts of nano titanium dioxide, 2 parts of curing agent T105, 3 parts of polybutyl acrylate, 0.6 parts of acrylic resin, 0.6 parts of sulfur, 2 parts of dispersant, 2 parts of leveling agent, 2 parts of antioxidant, 10 parts of low temperature accelerator, and 2 parts of saturated fatty acid.

[0035] A method for preparing a high impact-resistant and weather-resistant polyester TGIC type powder coating comprises the following steps:

[0036] S1, adding methyl methacrylate to methanol and mixing evenly to obtain a premixed solution; adding triethylenetetramine to a reactor, adding a dispersant and stirring until all dissolved, adding the premixed solution and stirring, and stirring to obtain a hyperbranched polymer;

[0037] S2, adding nano-titanium dioxide into water, ultrasonically dispersing, adding hyperbranched polymer, and ultrasonically treating at 75° C. for 3 h to obtain a grafted polymer;

[0038] S3. Add polyester resin, curing agent T105, polybutyl acrylate, acrylic resin, sulfur, leveling agent, antioxidant, low-temperature accelerator and saturated fatty acid into a high-speed mixer and stir, then cool to room temperature and take out the mixture, add it into a screw extruder, melt extrude, tablet, crush and sieve to obtain corrosion-resistant pure polyester powder coating.

[0039] In this embodiment, in step S1, methyl methacrylate is added to methanol and mixed evenly to obtain a premixed liquid; triethylenetetramine is added to a reactor, a dispersant is added and stirred until all dissolved, the premixed liquid is added and stirred at 5°C, and the temperature is raised to 80°C and stirred to obtain a hyperbranched polymer.

[0040] In this embodiment, in step S2, nano titanium dioxide is added to water, ultrasonically dispersed for 15 minutes, the pH of the system is adjusted to 6, a hyperbranched polymer is added, and ultrasonic treatment is performed at 80° C. for 6 hours to obtain a grafted polymer.

[0041] In this embodiment, in step S3, polyester resin, curing agent T105, polybutyl acrylate, acrylic resin, sulfur, dispersant, leveling agent, antioxidant, low-temperature accelerator, and saturated fatty acid are added to a high-speed mixer and stirred at 80°C for 2 hours, and the grafted polymer is added and stirred for 30 minutes. The mixture is then cooled to room temperature and taken out, added to a screw extruder, melt-extruded, tableted, crushed, and sieved to obtain a corrosion-resistant pure polyester powder coating.

[0042] In this embodiment, in step S3, the particles are crushed to a particle size of 12 μm.

[0043] Example 3

[0044] A high impact-resistant and weather-resistant polyester TGIC type powder coating, comprising, by weight:

[0045] 80 parts of polyester resin, 3 parts of methyl methacrylate, 2 parts of triethylenetetramine, 2 parts of nano titanium dioxide, 2 parts of curing agent T105, 3 parts of polybutyl acrylate, 0.6 parts of acrylic resin, 0.3 parts of sulfur, 2 parts of dispersant, 2 parts of leveling agent, 1 part of antioxidant, 15 parts of low temperature accelerator, and 3 parts of saturated fatty acid.

[0046] A method for preparing a high impact-resistant and weather-resistant polyester TGIC type powder coating comprises the following steps:

[0047] S1, adding methyl methacrylate to methanol and mixing evenly to obtain a premixed solution; adding triethylenetetramine to a reactor, adding a dispersant and stirring until all dissolved, adding the premixed solution and stirring, and stirring to obtain a hyperbranched polymer;

[0048] S2, adding nano-titanium dioxide into water, dispersing by ultrasonic, adding hyperbranched polymer, and ultrasonically treating at 60-100° C. for 2-4 h to obtain a grafted polymer;

[0049] S3. Add polyester resin, curing agent T105, polybutyl acrylate, acrylic resin, sulfur, leveling agent, antioxidant, low-temperature accelerator and saturated fatty acid into a high-speed mixer and stir, then cool to room temperature and take out the mixture, add it into a screw extruder, melt extrude, tablet, crush and sieve to obtain corrosion-resistant pure polyester powder coating.

[0050] In this embodiment, in step S1, methyl methacrylate is added to methanol and mixed evenly to obtain a premixed liquid; triethylenetetramine is added to a reactor, a dispersant is added and stirred until all dissolved, the premixed liquid is added and stirred at 5°C, and the temperature is raised to 85°C and stirred to obtain a hyperbranched polymer.

[0051] In this embodiment, in step S2, nano titanium dioxide is added to water, ultrasonically dispersed for 15 minutes, the pH of the system is adjusted to 6, a hyperbranched polymer is added, and ultrasonic treatment is performed at 80° C. for 6 hours to obtain a grafted polymer.

[0052] In this embodiment, in step S3, polyester resin, curing agent T105, polybutyl acrylate, acrylic resin, sulfur, dispersant, leveling agent, antioxidant, low-temperature accelerator, and saturated fatty acid are added to a high-speed mixer and stirred at 85°C for 2 hours, and the grafted polymer is added and stirred for 30 minutes. After cooling to room temperature, the mixture is taken out and added to a screw extruder, melt-extruded, tableted, crushed, and sieved to obtain a corrosion-resistant pure polyester powder coating.

[0053] In this embodiment, in step S3, the particles are crushed to a particle size of 60 μm.

[0054] In this embodiment, in step S1, the dispersant is a carbonate dispersant.

[0055] In this embodiment, the leveling agent is an organic silicon leveling agent.

[0056] Example 4

[0057] A high impact-resistant and weather-resistant polyester TGIC type powder coating, comprising, by weight:

[0058] 100 parts of polyester resin, 2 parts of methyl methacrylate, 1 part of triethylenetetramine, 2 parts of nano titanium dioxide, 2 parts of curing agent T105, 2 parts of polybutyl acrylate, 0.3 parts of acrylic resin, 0.4 parts of sulfur, 1 part of dispersant, 1 part of leveling agent, 2 parts of antioxidant, 10 parts of low temperature accelerator, and 3 parts of saturated fatty acid.

[0059] A method for preparing a high impact-resistant and weather-resistant polyester TGIC type powder coating comprises the following steps:

[0060] S1, adding methyl methacrylate to methanol and mixing evenly to obtain a premixed solution; adding triethylenetetramine to a reactor, adding a dispersant and stirring until all dissolved, adding the premixed solution and stirring, and stirring to obtain a hyperbranched polymer;

[0061] S2, adding nano-titanium dioxide into water, ultrasonically dispersing, adding hyperbranched polymer, and ultrasonically treating at 100° C. for 2 h to obtain a grafted polymer;

[0062] S3. Add polyester resin, curing agent T105, polybutyl acrylate, acrylic resin, sulfur, leveling agent, antioxidant, low-temperature accelerator and saturated fatty acid into a high-speed mixer and stir, then cool to room temperature and take out the mixture, add it into a screw extruder, melt extrude, tablet, crush and sieve to obtain corrosion-resistant pure polyester powder coating.

[0063] In this embodiment, in step S1, methyl methacrylate is added to methanol and mixed evenly to obtain a premixed liquid; triethylenetetramine is added to a reactor, a dispersant is added and stirred until all dissolved, the premixed liquid is added at 5°C and stirred, and the temperature is raised to 70-100°C and stirred to obtain a hyperbranched polymer.

[0064] In this embodiment, in step S2, nano titanium dioxide is added to water, ultrasonically dispersed for 15 minutes, the pH of the system is adjusted to 7, a hyperbranched polymer is added, and ultrasonic treatment is performed at 100° C. for 7 hours to obtain a grafted polymer.

[0065] In this embodiment, in step S3, polyester resin, curing agent T105, polybutyl acrylate, acrylic resin, sulfur, dispersant, leveling agent, antioxidant, low-temperature accelerator, and saturated fatty acid are added to a high-speed mixer and stirred at 90°C for 1 hour, and the grafted polymer is added and stirred for 20 minutes. After cooling to room temperature, the mixture is taken out and added to a screw extruder, melt-extruded, tableted, crushed, and sieved to obtain a corrosion-resistant pure polyester powder coating.

[0066] In this embodiment, in step S3, the particles are crushed to a particle size of 30 μm.

[0067] In this embodiment, in step S1, the dispersant is a silicate dispersant.

[0068] In this embodiment, the leveling agent is a leveling auxiliary agent.

[0069] In this embodiment, in step S3, the heating is performed at a heating rate of 6°C per minute to 900°C and kept at that temperature for 25 minutes; the heating is then performed to 1000°C and kept at that temperature for 75 minutes before being taken out for quenching.

[0070] In this embodiment, after step S3, scanning analysis is further included, in which a scanning electron microscope is used to scan the surface of the sample point by point and line by line to obtain the crystallographic orientation of each point in the micro-region.

[0071] The test items and data of the products prepared in Examples 1 to 4 are shown in Table 1

[0072]

[0073] It can be seen that the prepared polyester TGIC type powder coating has high impact resistance and good weather resistance.

[0074] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A high impact and weather resistant polyester TGIC type powder coating, characterized in that: In parts by weight: 35-100 parts of polyester resin, 2-4 parts of methyl methacrylate, 1-3 parts of triethylenetetramine, 2-4 parts of nano titanium dioxide, 1-5 parts of curing agent T105, 1-4 parts of polybutyl acrylate, 0.1-1 parts of acrylic resin, 0.1-1 parts of sulfur, 1-2 parts of dispersant, 1-2 parts of leveling agent, 1-2 parts of antioxidant, 4-20 parts of low-temperature accelerator, and 1-5 parts of saturated fatty acid.

2. The method for preparing a high impact and weather-resistant polyester TGIC type powder coating according to claim 1, characterized in that: The following steps are included: S1, adding methyl methacrylate to methanol and mixing evenly to obtain a premixed solution; adding triethylenetetramine to a reactor, adding a dispersant and stirring until all dissolved, adding the premixed solution and stirring, and stirring to obtain a hyperbranched polymer; S2, adding nano-titanium dioxide into water, dispersing by ultrasonic, adding hyperbranched polymer, and ultrasonically treating at 60-100° C. for 2-4 h to obtain a grafted polymer; S3. Add polyester resin, curing agent T105, polybutyl acrylate, acrylic resin, sulfur, leveling agent, antioxidant, low-temperature accelerator and saturated fatty acid into a high-speed mixer and stir, then cool to room temperature and take out the mixture, add it into a screw extruder, melt extrude, tablet, crush and sieve to obtain corrosion-resistant pure polyester powder coating.

3. The method for preparing a high impact and weather-resistant polyester TGIC type powder coating as claimed in claim 2, characterized in that: In step S1, methyl methacrylate is added to methanol and mixed evenly to obtain a premixed liquid; triethylenetetramine is added to a reactor, a dispersant is added and stirred until all dissolved, the premixed liquid is added and stirred at 2-6° C., the temperature is raised to 70-100° C. and stirred to obtain a hyperbranched polymer.

4. The method for preparing a high impact and weather-resistant polyester TGIC type powder coating according to claim 1, characterized in that: In step S2, nano titanium dioxide is added to water, ultrasonically dispersed for 10 to 20 minutes, the pH of the system is adjusted to 5 to 7, a hyperbranched polymer is added, and ultrasonic treatment is performed at 60 to 100° C. for 5 to 7 hours to obtain a grafted polymer.

5. The method for preparing a high impact and weather-resistant polyester TGIC type powder coating as claimed in claim 4, characterized in that: In step S3, polyester resin, curing agent T105, polybutyl acrylate, acrylic resin, sulfur, dispersant, leveling agent, antioxidant, low-temperature accelerator, and saturated fatty acid are added to a high-speed mixer and stirred at 80-90° C. for 1-2 hours, and the grafted polymer is added and stirred for 20-40 minutes. The mixture is then cooled to room temperature and taken out, added to a screw extruder, melt-extruded, tableted, crushed, and sieved to obtain a corrosion-resistant pure polyester powder coating.

6. The method for preparing a high impact and weather-resistant polyester TGIC type powder coating as claimed in claim 5, characterized in that: In step S3, the powder is crushed to a particle size of 10 to 60 μm.

7. The method for preparing a high impact and weather-resistant polyester TGIC type powder coating as claimed in claim 6, characterized in that: In step S1, the dispersant is a silicate dispersant, a polyphosphate or a carbonate dispersant.

8. A high impact and weather resistant polyester TGIC type powder coating and a preparation method thereof as claimed in claim 7, characterized in that: The leveling agent is an acrylic leveling agent, an organic silicon leveling agent or a leveling auxiliary agent.

9. A high impact and weather resistant polyester TGIC type powder coating and a preparation method thereof as claimed in claim 6, characterized in that: In step S3, the steel is heated to 900°C at a heating rate of 5-8°C per minute and kept at this temperature for 20-30 minutes; then heated to 1000°C and kept at this temperature for 60-80 minutes before being taken out for quenching.

10. A high impact and weather resistant polyester TGIC type powder coating and a preparation method thereof as claimed in claim 6, characterized in that: After step S3, scanning analysis is also included, in which the surface of the sample is scanned point by point and line by line using a scanning electron microscope to obtain the crystallographic orientation of each point in the micro-region.

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