阅读说明：本技术 一种汽车轮毂涂膜 (Automobile hub coating film ) 是由 汪年华 罗乐平 程殿辉 王永垒 江蓉 于 2019-08-27 设计创作，主要内容包括：本发明公开了一种汽车轮毂涂膜,包括轮毂本体,所述轮毂本体表面从内到外依次设置有底漆层、中间涂层和面漆层,所述底漆层、中间涂层和面漆层均采用粉末涂料喷涂成型设置,所述该粉末的粒径直径为30-45微米,这样可以平衡流平和上粉率,具有优异的漆膜光泽和饱满度等表面性能,所述面漆层的粉末颗粒直径依次大于中间涂层和底漆层的粉末颗粒直径,所述中间涂层的厚度依次大于底漆层和面漆层的厚度。本发明通过采用粉末涂料的方式,使汽车轮毂涂装取消底色漆,成为新的发展方向,从而根据粉末涂料零VOC特性使整个涂装过程中的VOC排放下降约20％,涂装工序减少、效率上升、良品率上升、成本降低。(The invention discloses an automobile hub coating film which comprises a hub body, wherein a primer layer, an intermediate coating and a finish coating are sequentially arranged on the surface of the hub body from inside to outside, the primer layer, the intermediate coating and the finish coating are all formed by powder coating spraying, the particle size diameter of the powder is 30-45 micrometers, so that the leveling rate and the powdering rate can be balanced, the automobile hub coating film has excellent surface properties such as paint film gloss and plumpness, the powder particle diameter of the finish coating is sequentially larger than the powder particle diameters of the intermediate coating and the primer layer, and the thickness of the intermediate coating is sequentially larger than the thicknesses of the primer layer and the finish coating. According to the invention, the powder coating mode is adopted, so that the automobile hub coating is free of the primer, and a new development direction is formed, the VOC emission in the whole coating process is reduced by about 20% according to the zero VOC characteristic of the powder coating, the coating process is reduced, the efficiency is improved, the yield is improved, and the cost is reduced.)

1. The utility model provides an automobile wheel hub coats, includes the wheel hub body, its characterized in that: the surface of the hub body is sequentially provided with a primer layer, a middle coating layer and a finish paint layer from inside to outside, the primer layer, the middle coating layer and the finish paint layer are all formed by powder paint spraying, the diameter of the powder particle is 30-45 microns, the diameter of the powder particle of the surface paint layer is sequentially larger than the diameter of the powder particle of the intermediate coating layer and the diameter of the powder particle of the primer layer, the thickness of the intermediate coating is sequentially greater than that of the primer layer and the finish coating, the powder coating is formed by taking anti-corrosion epoxy resin as a main component, the powder is arranged in a spherical shape, the anti-corrosion epoxy resin is prepared by bisphenol A, liquid caustic soda, excessive epichlorohydrin and an auxiliary material, the liquid alkali is a mixed liquid formed by mixing a sodium hydroxide aqueous solution, a sodium chloride aqueous solution and water, and the auxiliary agent is an anticorrosive agent, a film-forming agent, a thickening agent and a dispersing agent.

2. The automobile hub coating film according to claim 1, characterized in that: the anti-corrosion epoxy resin has an epoxy equivalent of 740-860eq/100g, wherein the epoxy equivalent of the powder coating is one of 840eq/100g, 780eq/100g and 810eq/100 g.

3. The automobile hub coating film according to claim 1, characterized in that: the softening point of the anti-corrosion epoxy resin is 87-91 ℃, and the softening point of the powder coating is one of 90 ℃, 88 ℃ and 89 ℃.

4. The automobile hub coating film according to claim 1, characterized in that: the content of organic chlorine in the anticorrosive epoxy resin is less than or equal to 0.002eq/100g, and the content of organic chlorine in the powder coating is one of 0.0015eq/100g, 0.0011eq/100g and 0.0009eq/100 g.

5. The automobile hub coating film according to claim 1, characterized in that: the inorganic chlorine content of the anti-corrosion epoxy resin is less than or equal to 0.0004eq/100g, and the inorganic chlorine content of the powder coating is one of 0.00031eq/100g, 0.0002eq/100g and 0.00038eq/100 g.

6. The automobile hub coating film according to claim 1, characterized in that: the volatility of the anticorrosive epoxy resin is less than or equal to 0.2 percent, and the volatility of the powder coating is one of 0.19 percent, 0.15 percent and 0.10 percent.

7. The automobile hub coating film according to claim 1, characterized in that: the chroma of the anticorrosive epoxy resin is less than or equal to 2, wherein the chroma is calculated by a Gardner method, and the chroma of the powder coating is one of 1.7, 1.9 and 1.5.

8. The automobile hub coating film according to claim 1, characterized in that: the primer layer, the intermediate coating and the finish paint layer are all set by adopting an electrostatic spraying technology, and the adopted equipment is an electrostatic spraying machine.

Technical Field

The invention relates to the technical field of automobile hub protection, in particular to an automobile hub coating film.

Background

The hub (Car Rim) is the part of the wheel center where the axle is mounted, that is, the "Rim" or "steel ring" of people. Therefore, selection of a hub surface coating film is particularly important, and the hub surface coating film is required to have excellent mechanical properties, good horizontal fluidity, salt spray resistance, weather resistance, and the like in addition to good surface quality and workability.

However, the surface of the automobile hub is mostly rough casting surface, which causes poor contact of the coating film and affects the service life of the coating film, and the automobile hub is a main bearing part of the automobile, which not only requires sufficient mechanical strength, but also requires sufficient toughness to ensure the impact resistance, and the hub is easy to be stained with dirt, and if the automobile hub is not clean for a long time, the automobile hub is likely to be corroded and deformed, so that the potential safety hazard is generated.

Therefore, it is necessary to invent a coating film for automobile wheel hub to solve the above problems.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an automobile hub coating, which is a new development direction by adopting a powder coating mode to remove base coat in automobile hub coating, so that the VOC emission in the whole coating process is reduced by about 20 percent according to the zero VOC characteristic of the powder coating, the coating process is reduced, the efficiency is improved, the yield is improved, and the cost is reduced, thereby solving the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides an automobile hub film, includes the wheel hub body, wheel hub body surface has set gradually priming paint layer, intermediate coat and finish paint layer from inside to outside, priming paint layer, intermediate coat and finish paint layer all adopt powder coating spray forming to set up, the particle diameter of this powder is 30-45 microns, can balance levelling and powdering rate like this, has surface properties such as excellent paint film gloss and plumpness, the powder particle diameter of finish paint layer is greater than the powder particle diameter of intermediate coat and priming paint layer in proper order, the thickness of intermediate coat is greater than the thickness of priming paint layer and finish paint layer in proper order, this powder coating adopts anticorrosive epoxy to constitute for the major constituent, this powder shape is globular setting, this anticorrosive epoxy adopts bisphenol A, liquid caustic soda, excessive epichlorohydrin and auxiliary agent material preparation to form, the liquid alkali is a mixed liquid formed by mixing a sodium hydroxide aqueous solution, a sodium chloride aqueous solution and water, and the auxiliary agent is an anticorrosive agent, a film-forming agent, a thickening agent and a dispersing agent.

Preferably, the anti-corrosion epoxy resin is one of the powder coating with an epoxy equivalent of 740-860eq/100g, wherein the powder coating has an epoxy equivalent of 840eq/100g, 780eq/100g and 810eq/100 g.

Preferably, the softening point of the anticorrosion epoxy resin is 87-91 ℃, and the softening point of the powder coating is one of 90 ℃, 88 ℃ and 89 ℃.

Preferably, the content of organic chlorine in the anticorrosive epoxy resin is less than or equal to 0.002eq/100g, and the content of organic chlorine in the powder coating is one of 0.0015eq/100g, 0.0011eq/100g and 0.0009eq/100 g.

Preferably, the inorganic chlorine content of the anticorrosive epoxy resin is less than or equal to 0.0004eq/100g, and the inorganic chlorine content of the powder coating is one of 0.00031eq/100g, 0.0002eq/100g and 0.00038eq/100 g.

Preferably, the volatility of the anticorrosion epoxy resin is less than or equal to 0.2 percent, and the volatility of the powder coating is one of 0.19 percent, 0.15 percent and 0.10 percent.

Preferably, the anti-corrosion epoxy resin has a color number of less than or equal to 2, wherein the color number is calculated by a Gardner method, and the color number of the powder coating is one of 1.7, 1.9 and 1.5.

Preferably, the primer layer, the intermediate coating and the finish coating are all set by adopting an electrostatic spraying technology, and the adopted equipment is an electrostatic spraying machine.

Preferably, the electrostatic spraying technology is as follows: high voltage direct current of 30kV to 90kV is applied to an electrode of a spray gun and a grounded metal element, and the powder coating is sprayed into the air by a compressed air method. The spray gun ionizes surrounding air particles during discharging, when the charged particles collide with particles of powder coating, charged powder particles are formed, the charged particles are adsorbed on the surface of a hub of an automobile, and the surface of an automobile workpiece can continuously adsorb the charged powder particles before insulation damage due to slow speed of releasing charges.

The invention has the technical effects and advantages that:

1. according to the invention, the powder coating is adopted to spray the primer layer, the intermediate coating and the finish paint layer on the surface of the automobile hub, so that the primer layer effectively utilizes the phenomenon that the powder coating does not contain a solvent, the paint has good mark filling and covering performance, and covers surface defects with the first coating of the automobile hub, and the powder coating is not easy to sag and can easily reach the phenomenon of single-layer high film thickness.

2. According to the invention, the powder coating mode is adopted, so that the automobile hub coating has an environment-friendly trend of 'paint-to-powder', the traditional 4-coating mode is changed into 3-coating mode, the base paint is cancelled, and the base powder with the integrated bottom surface is used, so that a new development direction is formed, the VOC emission in the whole coating process is reduced by about 20% according to the zero VOC characteristic of the powder coating, the coating process is reduced, the efficiency is increased, the yield is increased, and the cost is reduced.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.