An impact-resistant and wear-resistant powder coating and its preparation method

Abstract

The present invention discloses an impact-resistant and wear-resistant powder coating and a preparation method thereof, which relates to the field of coatings. Among them, the impact-resistant and wear-resistant powder coating comprises 100-150 parts by weight of a binder, 15-35 parts by weight of a curing agent, 20-50 parts by weight of a pigment, and 1-3 parts by weight of a dispersant. Based on the binder, the binder comprises raw material terminal hydroxyl polyester resin, double-end epoxy silicone oil, hydroxyl acrylic resin, and fatty acid polyol ester, and the weight ratio of the terminal hydroxyl polyester resin, double-end epoxy silicone oil, hydroxyl acrylic resin, and fatty acid polyol ester is (80-200):(100-180):(40-120):(3-8). This impact-resistant and wear-resistant powder coating has both high wear resistance and high impact resistance, and also has good salt spray resistance. In addition, the pigment is evenly distributed in the powder coating, and the color of the paint film formed by the powder coating is uniform.

Description

Technical Field

[0001] The present invention relates to the field of coatings, and in particular to an impact-resistant and wear-resistant powder coating and a preparation method thereof. Background Art

[0002] Powder coatings are a type of green coating without volatile solvents and are widely used in the spraying of household appliances and mechanical equipment. Currently, powder coatings mainly include epoxy powder, polyester powder coatings, acrylate powder coatings, etc. Among them, polyester powder coatings are widely used due to their high powder deposition rate, good leveling property, and plump paint film.

[0003] Currently, the polyester powder coatings in the related art are usually prepared from polyester resin, pigments, curing agents, dispersants, and some other trace additives, and have good weather resistance. However, in some special fields, the polyester powder coatings in the related art are difficult to simultaneously meet the requirements of high wear resistance and high impact resistance. Summary of the Invention

[0004] In order to improve the wear resistance and impact resistance of the powder coatings in the related art, the present application provides an impact-resistant and wear-resistant powder coating and a preparation method thereof.

[0005] The impact-resistant and wear-resistant powder coating provided by the present application adopts the following technical solutions:

[0006] An impact-resistant and wear-resistant powder coating, comprising the following raw materials in parts by weight:

[0007] Binder: 100 - 150 parts

[0008] Curing agent: 15 - 35 parts

[0009] Pigment: 20 - 50 parts

[0010] Dispersant: 1 - 3 parts

[0011] Based on the binder, the binder comprises raw material terminal hydroxyl polyester resin, bis-terminal epoxy silicone oil, hydroxyl acrylate resin, and fatty acid polyol ester, and the weight ratio of the terminal hydroxyl polyester resin, bis-terminal epoxy silicone oil, hydroxyl acrylate resin, and fatty acid polyol ester is (80 - 200) : (100 - 180) : (40 - 120) : (3 - 8).

[0012] The binder in the powder coating of this application uses a binder prepared from a hydroxyl-terminated polyester resin, a bis-terminal epoxy silicone oil, a hydroxyl acrylic resin, and a fatty acid polyol ester. Among them, under the action of the fatty acid polyol ester, the bis-terminal epoxy silicone oil comes into full contact with the hydroxyl-terminated polyester resin and the hydroxyl acrylic resin, enabling the epoxy groups in the bis-terminal epoxy silicone oil to react with the hydroxyl groups in the hydroxyl-terminated polyester resin and the hydroxyl acrylic resin. This binder contains polyester segments, silicone oil segments, and acrylic resin segments at the same time. Under the action of the silicone oil segments, the salt spray resistance of the paint film formed by this powder coating can be improved. In addition, by incorporating silicone oil segments and acrylic resin segments into the polyester resin at the same time, the paint film formed by the powder coating can have both wear resistance and good impact resistance.

[0013] Preferably, the weight ratio of the hydroxyl-terminated polyester resin, the bis-terminal epoxy silicone oil, the hydroxyl acrylic resin, and the fatty acid polyol ester is (120 - 160):(120 - 150):(80 - 110):(4 - 5).

[0014] When the weight ratio of the hydroxyl-terminated polyester resin, the bis-terminal epoxy silicone oil, the hydroxyl acrylic resin, and the fatty acid polyol ester is within the range of (120 - 160):(120 - 150):(80 - 110):(4 - 5), the salt spray resistance, wear resistance, and impact resistance of the paint film formed by this powder coating are further improved. At the same time, the wetting effect between the pigment and the binder is enhanced, effectively improving the binding stability between the pigment and the binder, and being able to reduce the problem of pigment shedding caused by vibration during transportation, packaging, or long-term storage, which is beneficial to improving the color uniformity and stability of the paint film formed by the powder coating.

[0015] Preferably, the weight ratio of the hydroxyl-terminated polyester resin, the bis-terminal epoxy silicone oil, the hydroxyl acrylic resin, and the fatty acid polyol ester is (135 - 145):(130 - 140):(90 - 100):(4 - 5).

[0016] When the weight ratio of the hydroxyl-terminated polyester resin, the bis-terminal epoxy silicone oil, the hydroxyl acrylic resin, and the fatty acid polyol ester is within the range of (135 - 145):(130 - 140):(90 - 100):(4 - 5), it is beneficial to further improve the impact resistance of the paint film.

[0017] Optionally, the hydroxyl value of the hydroxyl-terminated polyester resin is 35 - 45mgKOH / g.

[0018] When the hydroxyl value of the hydroxyl-terminated polyester resin is within the range of 35 - 45mgKOH / g, it can improve the wear resistance of the paint film formed by the powder coating while further improving the impact resistance of the paint film.

[0019] Optionally, the molecular weight of the bis-terminal epoxy silicone oil is 1000 - 2000.

[0020] The molecular weight of the bis - terminal epoxy silicone oil is in the range of 1000 - 2000. While improving the salt - spray resistance of the paint film formed by the powder coating, it can further improve the wettability between the pigment and the binder, which is beneficial to enhancing the binding stability between the pigment and the binder.

[0021] Optionally, in the hydroxy - acrylic resin, the percentage content of the effective solid is 48 - 52 wt%, and based on the effective solid, the hydroxyl value is 80 - 100 mgKOH / g.

[0022] Using the above - mentioned hydroxy - acrylic resin can improve the abrasion resistance of the paint film formed by the powder coating while further enhancing the impact resistance of the paint film.

[0023] Optionally, the fatty acid polyol ester includes pentaerythritol stearate and sorbitan fatty acid ester, and the weight ratio of pentaerythritol stearate to sorbitan fatty acid ester is 1:(3 - 4).

[0024] Selecting the composition of pentaerythritol stearate and sorbitan fatty acid ester with the above - mentioned ratio as the fatty acid polyol ester is beneficial to further improving the structural stability of the powder coating during transportation, packaging, or long - term storage, and has a promoting effect on improving the color stability of the paint film formed by the powder coating.

[0025] Optionally, the pigment is an inorganic pigment, and the dispersant is a silane coupling agent.

[0026] Inorganic pigments have the characteristics of light - fastness, heat - resistance, weather - resistance, and strong covering power. The role of the silane coupling agent is to improve the dispersion performance of inorganic pigments in the binder, which is beneficial to the formation of a paint film with uniform chromaticity by the powder coating.

[0027] Preferably, the inorganic pigment is selected from any one of titanium dioxide, barium sulfate, zinc oxide, calcium carbonate, titanium yellow, zinc white, lead white, zinc sulfide, lithopone, antimony oxide, cobalt blue, and carbon black.

[0028] More preferably, the particle size range of the inorganic pigment is 10 - 50 nm.

[0029] Optionally, the curing agent is an isocyanate curing agent.

[0030] Selecting the isocyanate curing agent as the curing agent is beneficial to improving the adhesion between the paint film formed by the powder coating and the substrate.

[0031] Optionally, the isocyanate curing agent is selected from any one or a combination of toluene diisocyanate, diphenylmethane diisocyanate, and isophorone diisocyanate.

[0032] In a second aspect, a method for preparing an impact-resistant and wear-resistant powder coating provided by the present application adopts the following technical solution:

[0033] A method for preparing an impact-resistant and wear-resistant powder coating includes the following steps:

[0034] Preparing a binder: Melting and mixing a hydroxyl-terminated polyester resin and a fatty acid polyol ester at 120 - 140°C, adding a bis-terminal epoxy silicone oil and a hydroxyl acrylate resin, raising the temperature to 180 - 200°C and reacting for 20 - 30 minutes, and then granulating to obtain the binder;

[0035] Preparing the powder coating: Uniformly mixing the binder, curing agent, and pigment, reacting at 120 - 140°C for 1 - 1.5 hours, and then pressing, pulverizing, and screening to obtain the powder coating.

[0036] The method for preparing the powder coating by the above method has the characteristics of simple steps and convenient operation. At the same time, it is beneficial to the uniform dispersion of the pigment and can improve the color uniformity of the paint film formed by the powder coating.

[0037] Optionally, a method for preparing an impact-resistant and wear-resistant powder coating includes the following steps:

[0038] Preparing a binder: Putting a hydroxyl-terminated polyester resin and a fatty acid polyol ester into a reaction kettle, raising the temperature to 120 - 140°C, stirring at a stirring speed of 800 - 1200 r / min for 30 - 40 minutes, then adding a bis-terminal epoxy silicone oil and a hydroxyl acrylate resin, raising the temperature to 180 - 190°C, and continuing to stir and react at a stirring speed of 800 - 1200 r / min for 20 - 30 minutes, and then granulating to obtain the binder;

[0039] Preparing the powder coating: Putting the binder, curing agent, and pigment into a reaction kettle, controlling the reaction temperature at 120 - 140°C, stirring and reacting at a stirring speed of 1000 - 1500 r / min for 1 - 1.5 hours, and then pressing, pulverizing, and screening to obtain a powder coating with a particle size range of 80 - 100 μm.

[0040] In summary, the technical solution of the present application has at least the following beneficial effects:

[0041] 1. The binder in the powder coating of this application is made from a binder jointly prepared by a hydroxyl-terminated polyester resin, a bis-terminal epoxy silicone oil, a hydroxyl acrylic resin, and a fatty acid polyol ester. Among them, under the action of the fatty acid polyol ester, the bis-terminal epoxy silicone oil comes into full contact with the hydroxyl-terminated polyester resin and the hydroxyl acrylic resin, enabling the epoxy groups in the bis-terminal epoxy silicone oil to react with the hydroxyl groups in the hydroxyl-terminated polyester resin and the hydroxyl acrylic resin. This binder contains polyester segments, silicone oil segments, and acrylic resin segments at the same time. Under the action of the silicone oil segments, the salt spray resistance of the paint film formed by this powder coating can be improved. In addition, by incorporating silicone oil segments and acrylic resin segments into the polyester resin at the same time, the paint film formed by the powder coating can have both wear resistance and good impact resistance.

[0042] 2. When the weight ratio of the hydroxyl-terminated polyester resin, the bis-terminal epoxy silicone oil, the hydroxyl acrylic resin, and the fatty acid polyol ester is within the range of (120 - 160):(120 - 150):(80 - 110):(4 - 5), the salt spray resistance, wear resistance, and impact resistance of the paint film formed by this powder coating are further improved. At the same time, the wetting effect between the pigment and the binder is enhanced, effectively improving the binding stability between the pigment and the binder, which has a promoting effect on improving the color stability of the paint film formed by the powder coating. Detailed implementation mode

[0043] The following further elaborates on this application in combination with specific experiments.

[0044] Examples

[0045]

Example 1

[0046] An impact-resistant and wear-resistant powder coating, comprising the following raw materials:

[0047] Binder: 100 kg,

[0048] Curing agent: 15 kg, specifically diphenylmethane diisocyanate is selected;

[0049] Pigment: 20 kg, specifically cobalt blue with a particle size range of 20 - 30 nm is selected;

[0050] Dispersant: 1 kg, specifically silane coupling agent KH560 is selected.

[0051] Among them, the binder is prepared from 80 kg of hydroxyl-terminated polyester resin, 100 kg of bis-terminal epoxy silicone oil, 120 kg of hydroxyl acrylic resin, and 3 kg of fatty acid polyol ester. Specifically, the hydroxyl value of the hydroxyl-terminated polyester resin is 40 mgKOH / g; the molecular weight of the bis-terminal epoxy silicone oil is 2000; the effective solid content of the hydroxyl acrylic resin is 50 wt%, the hydroxyl value is 100 mgKOH / g, and the viscosity is 5000 mPa·s (calculated based on the effective solid); the fatty acid polyol ester is specifically pentaerythritol stearate.

[0052] In addition, the preparation method of the wear-resistant powder coating in this example includes the following steps:

[0053] Prepare the binder: Put the hydroxyl-terminated polyester resin and the fatty acid polyol ester into a reaction kettle, heat up to 130°C, stir at a stirring speed of 1000 r / min for 30 min, then add the bis-terminal epoxy silicone oil and the hydroxyl acrylic resin, heat up to 190°C, and continue to stir and react at a stirring speed of 1000 r / min for 30 min, and then extrude and granulate to obtain the binder;

[0054] Prepare the powder coating: Put the binder, curing agent, and pigment into a reaction kettle, control the reaction temperature at 130°C, stir and react at a stirring speed of 1300 r / min for 1 h, and then press, crush, and screen to obtain a powder coating with a particle size range of 80 - 100 μm.

[0055]

Example 2

[0056] An impact-resistant and wear-resistant powder coating, comprising the following raw materials:

[0057] Binder: 125 kg,

[0058] Curing agent: 20 kg, specifically diphenylmethane diisocyanate;

[0059] Pigment: 35 kg, specifically cobalt blue with a particle size range of 20 - 30 nm;

[0060] Dispersant: 2 kg, specifically silane coupling agent KH560.

[0061] Among them, the binder is prepared from 80 kg of hydroxyl-terminated polyester resin, 100 kg of bis-terminal epoxy silicone oil, 120 kg of hydroxyl acrylic resin, and 3 kg of fatty acid polyol ester. Specifically, the hydroxyl value of the hydroxyl-terminated polyester resin is 40 mgKOH / g; the molecular weight of the bis-terminal epoxy silicone oil is 2000; the effective solid content of the hydroxyl acrylic resin is 50 wt%, the hydroxyl value is 100 mgKOH / g, and the viscosity is 5000 mPa·s (calculated based on the effective solid); the fatty acid polyol ester is specifically pentaerythritol stearate.

[0062] In addition, the preparation method of the wear-resistant powder coating in this embodiment is the same as that in Embodiment 1.

[0063]

Embodiment 3

[0064] An impact-resistant and wear-resistant powder coating, comprising the following raw materials:

[0065] Binder: 150 kg,

[0066] Curing agent: 35 kg, specifically diphenylmethane diisocyanate is selected;

[0067] Pigment: 50 kg, specifically cobalt blue with a particle size range of 20 - 30 nm is selected;

[0068] Dispersant: 3 kg, specifically silane coupling agent KH560 is selected.

[0069] Among them, the binder is prepared from 80 kg of hydroxyl-terminated polyester resin, 100 kg of bis-terminal epoxy silicone oil, 120 kg of hydroxyl acrylic resin, and 3 kg of fatty acid polyol ester. Specifically, the hydroxyl value of the hydroxyl-terminated polyester resin is 40 mg KOH / g; the molecular weight of the bis-terminal epoxy silicone oil is 2000; the effective solid content of the hydroxyl acrylic resin is 50 wt%, the hydroxyl value is 100 mg KOH / g, and the viscosity is 5000 mPa·s (based on the effective solid); specifically, pentaerythritol stearate is selected as the fatty acid polyol ester.

[0070] In addition, the preparation method of the wear-resistant powder coating in this embodiment is the same as that in Embodiment 1.

[0071]

Embodiment 4

[0072] An impact-resistant and wear-resistant powder coating, different from Embodiment 2 in that: the weight ratios of the raw materials hydroxyl-terminated polyester resin, bis-terminal epoxy silicone oil, hydroxyl acrylic resin, and fatty acid polyol ester in the binder are different.

[0073] Among them, in this embodiment, the binder is prepared from 100 kg of hydroxyl-terminated polyester resin, 110 kg of bis-terminal epoxy silicone oil, 115 kg of hydroxyl acrylic resin, and 4 kg of fatty acid polyol ester.

[0074]

Embodiment 5

[0075] An impact-resistant and wear-resistant powder coating, different from Embodiment 2 in that: the weight ratios of the raw materials hydroxyl-terminated polyester resin, bis-terminal epoxy silicone oil, hydroxyl acrylic resin, and fatty acid polyol ester in the binder are different.

[0076] Among them, in this embodiment, the binder is prepared from 120 kg of hydroxyl-terminated polyester resin, 120 kg of bis-terminal epoxy silicone oil, 110 kg of hydroxyl acrylic resin, and 4 kg of fatty acid polyol ester.

[0077]

Example 6

[0078] An impact-resistant and wear-resistant powder coating, which is different from Example 2 in that: the weight ratios of the raw material terminal hydroxyl polyester resin, double-terminal epoxy silicone oil, hydroxyl acrylic resin, and fatty acid polyol ester in the binder are different.

[0079] Among them, in this example, the binder is prepared from 140 kg of terminal hydroxyl polyester resin, 135 kg of double-terminal epoxy silicone oil, 95 kg of hydroxyl acrylic resin, and 4.5 kg of fatty acid polyol ester.

[0080]

Example 7

[0081] An impact-resistant and wear-resistant powder coating, which is different from Example 2 in that: the weight ratios of the raw material terminal hydroxyl polyester resin, double-terminal epoxy silicone oil, hydroxyl acrylic resin, and fatty acid polyol ester in the binder are different.

[0082] Among them, in this example, the binder is prepared from 160 kg of terminal hydroxyl polyester resin, 150 kg of double-terminal epoxy silicone oil, 80 kg of hydroxyl acrylic resin, and 5 kg of fatty acid polyol ester.

[0083]

Example 8

[0084] An impact-resistant and wear-resistant powder coating, which is different from Example 2 in that: the weight ratios of the raw material terminal hydroxyl polyester resin, double-terminal epoxy silicone oil, hydroxyl acrylic resin, and fatty acid polyol ester in the binder are different.

[0085] Among them, in this example, the binder is prepared from 180 kg of terminal hydroxyl polyester resin, 165 kg of double-terminal epoxy silicone oil, 65 kg of hydroxyl acrylic resin, and 6 kg of fatty acid polyol ester.

[0086]

Example 9

[0087] An impact-resistant and wear-resistant powder coating, which is different from Example 2 in that: the weight ratios of the raw material terminal hydroxyl polyester resin, double-terminal epoxy silicone oil, hydroxyl acrylic resin, and fatty acid polyol ester in the binder are different.

[0088] Among them, in this example, the binder is prepared from 200 kg of terminal hydroxyl polyester resin, 180 kg of double-terminal epoxy silicone oil, 40 kg of hydroxyl acrylic resin, and 8 kg of fatty acid polyol ester.

[0089]

Example 10

[0090] An impact-resistant and wear-resistant powder coating, which is different from Example 6 in that: the fatty acid polyol ester is different. In this example, the fatty acid polyol ester is selected as sorbitan fatty acid ester.

[0091]

Example 11

[0092] An impact-resistant and wear-resistant powder coating, which is different from Example 6 in that: the fatty acid polyol ester is different. In this example, the fatty acid polyol ester includes pentaerythritol stearate and sorbitan fatty acid ester, and the weight ratio of pentaerythritol stearate to sorbitan fatty acid ester is 1:3.

[0093]

Example 12

[0094] An impact-resistant and wear-resistant powder coating, which is different from Example 6 in that: the fatty acid polyol ester is different. In this example, the fatty acid polyol ester includes pentaerythritol stearate and sorbitan fatty acid ester, and the weight ratio of pentaerythritol stearate to sorbitan fatty acid ester is 3:1.

[0095] Comparative example

[0096]

Comparative Example 1

[0097] A powder coating, which is different from Example 1 in that: the hydroxyl-terminated polyester resin in the binder is replaced with an equal amount of hydroxyl acrylic resin.

[0098]

Comparative Example 2

[0099] A powder coating, which is different from Example 1 in that: the hydroxyl acrylic resin in the binder is replaced with an equal amount of hydroxyl-terminated polyester resin.

[0100]

Comparative Example 3

[0101] A powder coating, which is different from Example 1 in that: the bis-terminal epoxy silicone oil in the binder is replaced with an equal amount of bis-terminal hydroxyl silicone oil.

[0102]

Comparative Example 4

[0103] A powder coating, which is different from Example 1 in that: the bis-terminal epoxy silicone oil in the binder is replaced with an equal amount of ethylene glycol diglycidyl ether.

[0104]

Comparative Example 5

[0105] A powder coating, which is different from Example 1 in that: the pentaerythritol stearate in the binder is not added.

[0106] Performance detection test

[0107] Preparation of samples to be tested: Under the same spraying pressure, the powder coatings obtained in the above Examples 1-12 and Comparative Examples 1-5 were respectively sprayed on ferrite magnetic rings preheated in an oven at 200°C by means of high-voltage electrostatic spraying. The coating thickness was 200 μm, the curing temperature was 200°C, and the curing time was 5 min to obtain the samples to be tested A.

[0108] After stirring the powder coatings obtained in Examples 1-12 and Comparative Examples 1-5 at a stirring speed of 1000 r / min for 1 h, the stirred powder coatings were respectively sprayed onto ferrite magnetic rings preheated in an oven at 200 °C by means of high-voltage electrostatic spraying. The coating thickness was 200 μm, the curing temperature was 200 °C, and the curing time was 5 min to obtain test samples B to be measured.

[0109] After stirring the powder coatings obtained in Examples 1-12 and Comparative Examples 1-5 at a stirring speed of 2000 r / min for 1 h, the stirred powder coatings were respectively sprayed onto ferrite magnetic rings preheated in an oven at 200 °C by means of high-voltage electrostatic spraying. The coating thickness was 200 μm, the curing temperature was 200 °C, and the curing time was 5 min to obtain test samples C to be measured.

[0110] 1. Pencil hardness: The pencil hardness was tested according to GB / T 6739-2006 Determination of film hardness by pencil method, and the results were recorded in Table 1 below. The test object was test sample A. Among them, the higher the hardness of the paint film, the better the wear resistance of the paint film.

[0111] 2. Impact resistance test: The impact resistance was tested according to GB / T 1732-2020 Determination method for film impact resistance, and a 4-fold magnifying glass was used to observe whether there were cracks, wrinkles and peeling phenomena. The maximum height (cm) of the pendulum weight where no cracks, wrinkles and peeling phenomena were observed in all three tests was recorded in Table 1 below. The test object was test sample A. Among them, the greater the maximum height of the pendulum weight, the better the impact resistance of the paint film.

[0112] 3. Salt spray resistance test: The salt spray resistance was tested according to GB / T 1771-2007 Determination of resistance to neutral salt spray of paints and varnishes. The concentration of the sodium chloride solution was 55 g / L, and the test periods were 500 h and 1000 h. Whether there were blistering or peeling phenomena on the paint film of the test specimen was observed, and the test results were recorded in Table 1 below. The test object was test sample A.

[0113] 4. Comparison of paint film appearance: Whether there was an obvious uneven color distribution on the paint films of test sample A, test sample B and test sample C was observed and recorded in Table 2 below.

[0114] Table 1

[0115]

[0116]

[0117] Table 2

[0118]

[0119] Combining Example 1 with Comparative Examples 1-5 and the data in Table 1 shows that the hydroxyl-terminated polyester resin, bis-terminal epoxy silicone oil, hydroxyl acrylate resin, and fatty acid polyol ester have a synergistic effect on simultaneously improving the wear resistance and impact resistance of the paint film formed by the powder coating.

[0120] Combining Example 2 with Examples 4-9 and the data in Table 1 shows that when the weight ratio of the hydroxyl-terminated polyester resin, bis-terminal epoxy silicone oil, hydroxyl acrylate resin, and fatty acid polyol ester is in the range of (120-160):(120-150):(80-110):(4-5), the salt spray resistance, wear resistance, and impact resistance of the paint film formed by the powder coating are further improved. At the same time, combining the data in Table 2 shows that when the powder coating uses the binder prepared from the above-mentioned specific ratio of raw materials, the powder coating is not easily damaged in structure at a stirring speed of 1000 r / min, indicating that the wetting effect between the pigment and the binder is enhanced, effectively improving the binding stability between the pigment and the binder, and promoting the color uniformity and stability of the paint film formed by the powder coating.

[0121] In addition, when the weight ratio of the hydroxyl-terminated polyester resin, bis-terminal epoxy silicone oil, hydroxyl acrylate resin, and fatty acid polyol ester is in the range of (135-145):(130-140):(90-100):(4-5), it is beneficial to further improve the impact resistance of the paint film.

[0122] Combining Example 6 with Examples 10-12 and the data in Table 2 shows that when the fatty acid polyol ester is a composition with a weight ratio of pentaerythritol stearate to sorbitan fatty acid ester of 1:(3-4), the powder coating is still not easily damaged in structure at a stirring speed of 2000 r / min, enabling the powder coating to maintain structural stability during transportation, packaging, or long-term storage, and promoting the color uniformity and stability of the paint film formed by the powder coating.

[0123] This specific embodiment is only an interpretation of the present application and does not limit the present application. Those skilled in the art can make modifications without creative contributions to this specific embodiment after reading this specification, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An impact-resistant and wear-resistant powder coating, characterized in that: Comprising the following raw materials in parts by weight: Binder: 100 - 150 parts Curing agent: 15 - 35 parts Pigment: 20 - 50 parts Dispersant: 1 - 3 parts Based on the binder, the binder comprises raw material terminal hydroxyl polyester resin, double-end epoxy silicone oil, hydroxyl acrylic resin, and fatty acid polyol ester, and the weight ratio of the terminal hydroxyl polyester resin, double-end epoxy silicone oil, hydroxyl acrylic resin, and fatty acid polyol ester is (80 - 200):(100 - 180):(40 - 120):(3 - 8); The preparation method of the binder is as follows: melt and mix the terminal hydroxyl polyester resin and fatty acid polyol ester at 120 - 140 °C, then add the double-end epoxy silicone oil and hydroxyl acrylic resin, raise the temperature to 180 - 200 °C and react for 20 - 30 min, and then granulate to obtain the binder; The curing agent selects isocyanate curing agent.

2. The impact-resistant and wear-resistant powder coating according to claim 1, wherein: The weight ratio of the terminal hydroxyl polyester resin, double-end epoxy silicone oil, hydroxyl acrylic resin, and fatty acid polyol ester is (120 - 160):(120 - 150):(80 - 110):(4 - 5).

3. The impact-resistant and wear-resistant powder coating according to claim 1, wherein: The weight ratio of the terminal hydroxyl polyester resin, double-end epoxy silicone oil, hydroxyl acrylic resin, and fatty acid polyol ester is (135 - 145):(130 - 140):(90 - 100):(4 - 5).

4. An impact-resistant and wear-resistant powder coating according to any one of claims 1-3, characterized in that: The hydroxyl value of the terminal hydroxyl polyester resin is 35 - 45 mgKOH / g.

5. A shock-resistant and wear-resistant powder coating according to any one of claims 1-3, characterized in that: The molecular weight of the double-end epoxy silicone oil is 1000 - 2000.

6. A kind of impact-resistant and wear-resistant powder coating according to any one of claims 1-3, characterized in that: In the hydroxyl acrylic resin, the percentage content of effective solid is 48 - 52 wt%, and based on the effective solid, the hydroxyl value is 80 - 100 mgKOH / g.

7. An impact-resistant and wear-resistant powder coating according to any one of claims 1 to 3, characterized in that: The fatty acid polyol ester comprises pentaerythritol stearate and sorbitan fatty acid ester, and the weight ratio of pentaerythritol stearate and sorbitan fatty acid ester is 1:(3 - 4).

8. An impact-resistant and wear-resistant powder coating according to claim 1, characterized in that: The pigment selects inorganic pigment, and the dispersant selects silane coupling agent.

9. A method for preparing an impact-resistant and wear-resistant powder coating according to any one of claims 1-8, characterized in that: Including the following steps: Prepare the binder: melt and mix the terminal hydroxyl polyester resin and fatty acid polyol ester at 120 - 140 °C, then add the double-end epoxy silicone oil and hydroxyl acrylic resin, raise the temperature to 180 - 200 °C and react for 20 - 30 min, and then granulate to obtain the binder; Prepare the powder coating: uniformly mix the binder, curing agent, and pigment, react at 120 - 140 °C for 1 - 1.5 h, and then press into tablets, crush, and sieve to obtain the powder coating.

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