A surface coating and coating method for polyurethane foam dodge balls

Abstract

A surface coating and coating method for polyurethane foam dodgeballs are disclosed. The surface coating includes a primer and a topcoat. The primer is a polyurethane monomer mesh coating, including polyurethane resin, diluent, dispersant, leveling agent, defoamer, anti-settling agent, and colorant. The pores of the polyurethane foam on the dodgeball surface are mainly covered by the mesh primer. The mesh structure of the primer interlocks with the pores of the polyurethane foam on the dodgeball surface, greatly enhancing the adhesion between the primer and the polyurethane foam substrate on the dodgeball surface. The topcoat is a water-based polyurethane mixed coating, including polyurethane resin, diluent, dispersant, leveling agent, defoamer, anti-settling agent, anti-sticking agent, pH neutralizer, feel agent, and colorant, greatly increasing the environmental protection coefficient of the product. The addition of feel agent and anti-sticking agent to the topcoat ensures both feel and surface effect.

Description

Technical Field

[0001] This invention relates to a surface coating and coating method for polyurethane foam dodgeballs. Background Technology

[0002] Polyurethane foam is a widely used material, made from polyether polyols, isocyanates, and various additives such as foaming agents, which are then foamed and molded. It can be customized to different requirements and shapes, and is widely used in products such as cushions, polyurethane toys, and kneeling mats. For example, in the case of elastic dodgeballs, after foaming, a coating is applied to the surface to form a covering layer. Currently, existing surface coating technologies for this product have the following shortcomings: 1. The surface layer is too thick, resulting in a poor feel; 2. The surface layer is merely a cover, not fully integrated, making it prone to peeling off. Summary of the Invention

[0003] To address the shortcomings mentioned above, this invention provides a surface coating and coating method for polyurethane foam dodgeballs.

[0004] To achieve the above objectives, the present invention provides a surface coating for polyurethane foam dodgeballs, comprising a primer and a topcoat;

[0005] The primer is a polyurethane monomer mesh coating, and the primer comprises the following components by weight: 30-60 parts polyurethane resin, 10-20 parts diluent, 0.5-1 part dispersant, 1-2 parts leveling agent, 1-2 parts defoamer, 0.5-1 part anti-settling agent, and 10-40 parts colorant.

[0006] The topcoat is a water-based polyurethane mixed coating, which, by weight, comprises the following components: 50-70 parts polyurethane resin, 10-20 parts thinner, 0.3-0.6 parts dispersant, 0.5-1 part leveling agent, 0.6-1.2 parts defoamer, 0.2-0.4 parts anti-settling agent, 0.5-1 part anti-sticking agent, 0.4-0.8 parts pH neutralizer, 0.5-1 part hand feel agent, and 10-20 parts colorant.

[0007] As a further improvement of the present invention, the diluent is an organic solvent or a mixture of organic solvents, and the diluent includes at least one of butanone, acetone, and cyclohexanone.

[0008] The present invention also provides a method for applying a surface coating to a polyurethane foam dodgeball, comprising the following steps:

[0009] (1) Primer spraying: Use a spray gun to spray the primer along the edge line of the dodgeball in a cross pattern to form a base layer of paint film on the surface of the dodgeball. After spraying, dry in an environment of 35℃-55℃ for 40-60 minutes.

[0010] (2) Apply 2-3 more coats of primer following the same spraying procedure as described above;

[0011] (3) Topcoat spraying: Use a spray gun to spray the topcoat along the edge line of the dodgeball in a cross pattern. After spraying, dry in an environment of 45℃-55℃ for 60-90 minutes.

[0012] (4) Apply 1-2 more coats of topcoat following the above topcoat application procedure;

[0013] (5) Obtain a dodgeball with a complete coating on its surface.

[0014] As a further improvement of the present invention, in step (1), the amount of primer sprayed is 0.15-0.2 kg / m², and the thickness of the bottom paint film is 5-10 μm.

[0015] As a further improvement of the present invention, in step (3), the amount of topcoat sprayed is 0.1-0.15 kg / m².

[0016] As a further improvement of the present invention, in steps (1) and (3), the nozzle diameter of the spray gun is 0.8-1.2 mm.

[0017] The beneficial effects of this invention are as follows:

[0018] The surface coating proposed in this invention includes a primer and a topcoat. The primer is a polyurethane monomer mesh coating, which dries faster after spraying and has strong adhesion to the dodgeball surface, making it less prone to peeling off. The topcoat is a water-based polyurethane mixed coating with added feel agent and anti-stick agent, which effectively improves the surface touch effect of the product and solves the problem of adhesion when products are stored together. Detailed Implementation

[0019] The present invention discloses a surface coating and coating method for polyurethane foam dodgeballs, wherein the surface coating includes a primer and a topcoat;

[0020] The primer is a polyurethane monomer mesh coating, and the primer comprises the following components by weight: 30-60 parts polyurethane resin, 10-20 parts diluent, 0.5-1 part dispersant, 1-2 parts leveling agent, 1-2 parts defoamer, 0.5-1 part anti-settling agent, and 10-40 parts colorant.

[0021] The topcoat is a water-based polyurethane mixed coating, which, by weight, comprises the following components: 50-70 parts polyurethane resin, 10-20 parts thinner, 0.3-0.6 parts dispersant, 0.5-1 part leveling agent, 0.6-1.2 parts defoamer, 0.2-0.4 parts anti-settling agent, 0.5-1 part anti-sticking agent, 0.4-0.8 parts pH neutralizer, 0.5-1 part hand feel agent, and 10-20 parts colorant;

[0022] The diluent is an organic solvent or a mixture of organic solvents, and the diluent includes at least one of butanone, acetone, and cyclohexanone.

[0023] The surface coating proposed in this invention includes a primer and a topcoat. The primer is a polyurethane monomer mesh coating, which dries faster after spraying and has strong adhesion to the dodgeball surface, making it less prone to peeling off. The topcoat is a water-based polyurethane mixed coating with added feel agent and anti-stick agent, which effectively improves the surface touch effect of the product and can solve the problem of adhesion when products are stored together.

[0024] A method for applying primer and topcoat to the surface of a polyurethane foam dodgeball includes the following steps:

[0025] (1) Primer spraying: Use a spray gun to spray the primer along the edge line of the dodgeball in a cross pattern. The amount of primer sprayed is 0.15-0.2 kg / m², forming a base coat on the surface of the dodgeball. The thickness of the base coat is 5-10 μm. After spraying, dry in an environment of 35℃-55℃ for 40-60 minutes.

[0026] (2) Apply 2-3 more coats of primer following the same spraying procedure as described above;

[0027] (3) Topcoat spraying: Use a spray gun to spray the topcoat along the edge of the dodgeball in a cross pattern. The nozzle diameter of the spray gun is 0.8-1.2mm, and the amount of topcoat sprayed is 0.1-0.15kg / ㎡. After spraying, dry in an environment of 45℃-55℃ for 60-90 minutes.

[0028] (4) Apply 1-2 more coats of topcoat following the above topcoat application procedure;

[0029] (5) Obtain a dodgeball with a complete coating on its surface.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A surface coating for polyurethane foamed cotton dodge balls, characterized by: The primer and the topcoat are included; The primer adopts a polyurethane monomer network coating, and the primer includes the following components in parts by weight: polyurethane resin 30-60 parts, diluent 10-20 parts, dispersant 0.5-1 part, leveling agent 1-2 parts, defoaming agent 1-2 parts, anti-settling agent 0.5-1 part, colorant 10-40 parts; The topcoat adopts a water-based polyurethane mixed coating, and the topcoat includes the following components in parts by weight: polyurethane resin 50-70 parts, diluent 10-20 parts, dispersant 0.3-0.6 parts, leveling agent 0.5-1 part, defoaming agent 0.6-1.2 parts, anti-settling agent 0.2-0.4 parts, anti-sticking agent 0.5-1 part, PH neutralizer 0.4-0.8 parts, hand feel agent 0.5-1 part, colorant 10-20 parts.

2. A surface coating for polyurethane foam dodge balls according to claim 1, characterized in that: The diluent is an organic solvent or a mixture of organic solvents, and the diluent includes at least one of butanone, acetone, and cyclohexanone.

3. A coating method for the surface coating of polyurethane foam dodge balls as claimed in claim 1 or 2, characterized in that, The method includes the following steps: (1) primer spraying: using a spray gun to spray the primer along the edge line of the dodge ball for one cross spraying, to form a primer film on the surface of the dodge ball, and drying for 40-60 minutes at an environment of 35-55 DEG C after spraying; (2) spraying 2-3 times according to the above primer spraying process; (3) topcoat spraying: using a spray gun to spray the topcoat along the edge line of the dodge ball for one cross spraying, and drying for 60-90 minutes at an environment of 45-55 DEG C after spraying; (4) spraying 1-2 times according to the above topcoat spraying process; (5) obtaining a dodge ball with a complete coating on the surface.

4. The coating method according to claim 3, characterized in that: In step (1), the spraying amount of the primer is 0.15-0.2 kg / m2, and the thickness of the primer film is 5-10 μm.

5. The coating method according to claim 3, characterized in that: In step (3), the spraying amount of the topcoat is 0.1-0.15 kg / m2.

6. The coating method according to claim 3, characterized in that: In steps (1) and (3), the caliber of the spray gun is 0.8-1.2 mm.