Production process of high-gloss epoxy powder coating

Abstract

The invention discloses a production process of a high-gloss epoxy powder coating, which specifically comprises the following steps: S1, preparing epoxy resin particles: sequentially stirring and mixing epoxy resin powder, a delustering agent, a flatting agent and a bulking agent, and carrying out extrusion molding to obtain flat epoxy resin particles; s2, softening adsorption: heating and softening the prepared epoxy resin particles in a rolling mixer, and then adding a powder brightener; s3, crushing: crushing the epoxy resin particles adsorbed with the brightener in a crusher to obtain the high-gloss epoxy powder coating. In the step S2, in the rolling process of the epoxy resin particles in the rolling mixing machine, the powder brightener is evenly sprayed to the epoxy resin particles, the epoxy resin particles coated with the powder brightener are smashed, the powder brightener can be directly attached to the fine epoxy powder coating, and the highlight brightness of the epoxy powder coating is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of powder coating production, and more specifically, to a production process of a high-gloss epoxy powder coating. Background Art

[0002] Epoxy resin is widely used because of its moderate price and good corrosion resistance, and is therefore considered to be one of the most suitable resins in the powder coating formulation. The powder coating based on epoxy resin has good adhesion, mechanical properties, moisture resistance and corrosion resistance, but its main disadvantage is insufficient brightness. Especially when applied indoors, the indoor environment is relatively dark. In view of this, in the prior art, when preparing epoxy resin coatings, a powder brightening agent is initially added, but the ratio of the brightening agent is very difficult to control. Too little affects the brightness of the epoxy resin, and too much will affect the overall performance of the epoxy resin. In view of this, the present invention proposes a production process of a high-gloss epoxy powder coating. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a production process of a high-gloss epoxy powder coating.

[0004] To achieve the above object, the present invention provides a production process of a high-gloss epoxy powder coating, and its innovation lies in: specifically including the following steps: S1, preparing epoxy resin particles, sequentially stirring and mixing epoxy resin powder, matting agent, leveling agent and loosening agent, and extruding and molding into flat epoxy resin particles; S2, softening and adsorbing, heating and softening the prepared epoxy resin particles in a tumbling mixer, and then adding a powder brightening agent to make the powder brightening agent evenly adsorbed on the epoxy resin particles; S3, pulverizing, pulverizing the epoxy resin particles adsorbed with the brightening agent in a pulverizer to obtain a high-gloss epoxy powder coating; In step S2, during the tumbling process of the epoxy resin particles in the tumbling mixer, the powder brightening agent is evenly sprayed onto the epoxy resin particles.

[0005] Further, the above-mentioned matting agent is a polyacrylate resin with an epoxy group.

[0006] Further, the above-mentioned leveling agent is any one of polyether polyester modified silicone, silicone oil, and polydimethylsiloxane.

[0007] Further, a rotatable tumbling member is provided at the bottom inside the tumbling mixer, and the tumbling member makes the softened epoxy resin particles perform cyclic left and right swinging tumbling. A plurality of powder nozzles are provided at the top inside the tumbling mixer, and the plurality of powder nozzles are circularly distributed directly above the tumbling member.

[0008] Further, the tumbling member includes a rotating rod and two arc-shaped grooves. The centers of the arc-shaped surfaces of the two arc-shaped grooves are both fixed on the rotating rod. The openings of the two arc-shaped grooves are both arranged facing away from the rotating rod. The rotating rod is rotatably arranged at the bottom inside the tumbling mixer, and arc-shaped bending portions are provided at the ends of the two arc-shaped grooves.

[0009] Further, the cycle time for the tumbling member to rotate 360° in the forward direction is t1, and the cycle for the tumbling member to rotate 360° in the reverse direction is t2, where t1 > t2. The tumbling member rotates 360° in the forward direction and 360° in the reverse direction alternately inside the tumbling mixer, and the cycle time for the powder nozzle to spray powder is t1 + t2.

[0010] The technical effects and advantages of the present invention: By evenly spraying the powder brightening agent on the softened epoxy resin particles, the powder brightening agent is evenly adsorbed on the epoxy resin particles, so that the powder brightening agent is coated on the epoxy resin particles. Finally, the epoxy resin particles coated with the powder brightening agent are pulverized, and the powder brightening agent will directly adhere to the fine powder epoxy powder coating, greatly improving the high gloss brightness of the epoxy powder coating. Description of the Drawings

[0011] Figure 1 It is a side structure diagram inside the tumbling mixer of the present invention. Detailed Embodiments

[0012] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0013] As Figure 1 A specific embodiment of the present invention specifically includes the following steps: S1. Prepare epoxy resin particles. Epoxy resin powder, matting agent, leveling agent, and loosening agent are successively stirred and mixed, and then extruded into flat epoxy resin particles. S2. Softening and adsorption. Heat and soften the prepared epoxy resin particles in the tumbling mixer 1, and then add the powder brightening agent to make the powder brightening agent evenly adsorbed on the epoxy resin particles. S3. Pulverization. Pulverize the epoxy resin particles adsorbed with the brightening agent in a pulverizer to obtain a high-gloss epoxy powder coating. In step S2, during the tumbling process of the epoxy resin particles in the tumbling mixer 1, the powder brightening agent is evenly sprayed onto the epoxy resin particles.

[0014] In the present invention, by uniformly spraying the powder brightening agent on the softened epoxy resin particles, the powder brightening agent is uniformly adsorbed on the epoxy resin particles, so that the powder brightening agent is coated on the epoxy resin particles. Finally, the epoxy resin particles coated with the powder brightening agent are crushed, and the powder brightening agent will be directly attached to the fine powder epoxy powder coating, greatly improving the high gloss brightness of the epoxy powder coating.

[0015] In the present invention, as a preferred embodiment, the above-mentioned matting agent is a polypropylene ester resin with an epoxy group.

[0016] In the present invention, as a preferred embodiment, the above-mentioned leveling agent is any one of polyether-polyester modified silicone, silicone oil, and polydimethylsiloxane.

[0017] In the present invention, as a preferred embodiment, a rotatable tumbling member 2 is provided at the bottom inside the tumbling mixer 1, and the tumbling member 2 causes the softened epoxy resin particles to perform cyclic left-right swinging and tumbling. A plurality of powder nozzles 3 are provided at the top inside the tumbling mixer 1, and the plurality of powder nozzles 3 are circularly distributed directly above the tumbling member 2.

[0018] In the present invention, the working principle inside the tumbling mixer 1 is as follows: The setting of the tumbling member 2 enables the softened epoxy resin particles to swing and tumble left and right. At the same time, through the circularly distributed powder nozzles 3, the powder brightening agent is uniformly sprayed on the tumbling epoxy resin particles.

[0019] In the present invention, as a preferred embodiment, the above-mentioned tumbling member 2 includes a rotating rod 21 and two arc-shaped grooves 22. The centers of the arc-shaped surfaces of the two arc-shaped grooves 22 are both fixed on the rotating rod 21, and the openings of the two arc-shaped grooves 22 are both arranged facing away from the rotating rod 21. The rotating rod 21 is rotatably arranged at the bottom inside the tumbling mixer 1, and arc-shaped bending portions 4 are provided at the ends of the two arc-shaped grooves 22.

[0020] In the present invention, the working principle of the tumbling member 2 is as follows: The rotating rod 21 drives the two arc-shaped grooves 22 to rotate synchronously. Among them, when the arc-shaped groove 22 with the opening facing down rotates, it will turn the epoxy resin particles inside the tumbling mixer 1. At the same time, as the arc-shaped groove 22 with the opening facing down rotates with the rotating rod 21 and its posture changes to the opening facing down, during this process, the arc-shaped bending portion 4 at the end of the arc-shaped groove 22 will shovel some of the epoxy resin particles inside the tumbling mixer 1 into the inside of the arc-shaped groove 22. The epoxy resin particles inside the arc-shaped groove 22 continue to tumble as the posture of the arc-shaped groove 22 changes, and the powder nozzle 3 sprays the powder brightening agent into the inside of the arc-shaped groove 22, so that the powder brightening agent can be uniformly adsorbed on the epoxy resin particles. Tumbling continues according to the above process, and finally the epoxy resin particles are uniformly coated with the powder brightening agent.

[0021] In the present invention, as a preferred solution, the cycle time for the forward rotation of the tumbling member 2 by 360° is t1, and the cycle time for the reverse rotation of the tumbling member 2 by 360° is t2, where t1 > t2. The tumbling member 2 rotates forward and backward alternately inside the tumbling mixer 1, and the cycle time for the powder nozzle 3 to eject powder is t1 + t2.

[0022] In the present invention, the tumbling member 2 rotates alternately in the forward and reverse directions, which can tumble the epoxy resin particles from different directions. Moreover, the time for the forward rotation by 360° is longer than the time for the reverse rotation by 360°, so that when the epoxy resin particles are tumbled in different directions and at different speeds, the tumbling efficiency of the epoxy resin can be increased, ensuring that the powder brightening agent can be fully coated on the outer side of the epoxy resin particles. At the same time, the cycle time for the powder nozzle 3 to eject powder corresponds to the cycle time of the alternating tumbling of the tumbling member 2, which can avoid excessive ejection of the powder brightening agent and affect the coating effect of the powder brightening agent on the epoxy resin particles.

[0023] Finally, several points should be noted: First, in the description of the present application, it should be noted that unless otherwise specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense, which can be mechanical connection or electrical connection, or the communication inside two components, and can be directly connected. "Up", "down", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the described object changes, the relative position relationship may change; Second: In the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A production process for a high-gloss epoxy powder coating, characterized in that: The specific steps include: S1, preparing epoxy resin particles, mixing epoxy resin powder, matting agent, leveling agent and loosening agent in sequence by stirring, extruding and molding into flat epoxy resin particles; S2, softening and adsorption, heating and softening the prepared epoxy resin particles in a tumbling mixer (1), and then adding a powdered brightener so that the powdered brightener is uniformly adsorbed on the epoxy resin particles; S3, crushing, crushing the epoxy resin particles adsorbing the brightener in a crusher to obtain a high-gloss epoxy powder coating; In step S2, while the epoxy resin particles are tumbling in the tumbling mixer (1), the powdered brightener is evenly sprayed onto the epoxy resin particles.

2. The production process of a high gloss epoxy powder coating according to claim 1, characterized in that: The matting agent is a polyacrylate resin with epoxy groups.

3. The production process of a high gloss epoxy powder coating according to claim 1, characterized in that: The leveling agent is any one of polyether polyester modified organic siloxane, silicone oil and polydimethylsiloxane.

4. The production process of a high gloss epoxy powder coating according to claim 1, characterized in that: A rotatable tumbling member (2) is provided at the bottom of the tumbling mixer (1), and the tumbling member (2) causes the softened epoxy resin particles to cyclically swing left and right. A plurality of powder nozzles (3) are provided at the top of the tumbling mixer (1), and the plurality of powder nozzles (3) are distributed in a circular shape directly above the tumbling member (2).

5. The production process of a high gloss epoxy powder coating according to claim 4, characterized in that: The tumbling member (2) comprises a rotating rod (21) and two arc-shaped grooves (22); the centers of the arc-shaped surfaces of the two arc-shaped grooves (22) are fixed on the rotating rod (21); the openings of the two arc-shaped grooves (22) are arranged with their backs facing the rotating rod (21); the rotating rod (21) is rotatably arranged at the bottom of the interior of the tumbling mixer (1); and the ends of the two arc-shaped grooves (22) are provided with arc-shaped bending portions (4).

6. The production process of a high gloss epoxy powder coating according to claim 4, characterized in that: The period time of the tumbling member (2) rotating 360° in the forward direction is t1, and the period time of the tumbling member (2) rotating 360° in the reverse direction is t2, wherein t1>t2, the tumbling member (2) rotates 360° in the forward direction and 360° in the reverse direction alternately inside the tumbling mixer (1), and the period time of the powder nozzle (3) spraying powder is t1+t2.

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