Vehicle body coating structure used in low-temperature cold climate

Abstract

The utility model belongs to the technical field of car body corrosion prevention, and particularly relates to a car body coating structure used in low-temperature cold weather. The device comprises an electrophoresis layer which is coated on the inner and outer surfaces of a vehicle body; the floating coat is coated on the electrophoresis layer on the outer surface of the vehicle body; the finishing coat layer is coated on the floating coat layer; and the hydrophobic layer is at least coated on the finishing coat layer on the outer surface of the skirt edge of the vehicle body. The anti-corrosion device is used for solving the problem that the anti-corrosion effect of a vehicle body is poor in cold weather. The hydrophobic layer is sprayed on the outer side of the vehicle body skirt which is easy to contact with ice and snow outside the finishing coat layer, so that ice and snow are not easy to freeze when contacting with the hydrophobic layer, and even if the ice and an ice layer frozen on the surface of the hydrophobic coating are frozen, the ice and the ice layer are also easy to remove. A large amount of snow frozen on the outer skirt of the automobile body is reduced, and corrosion of a snow-melting agent to the skirt is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of car body corrosion protection, and particularly relates to a car body coating structure for use in low-temperature cold zone climate. BACKGROUND

[0002] In order to prevent the car body from corroding, especially in the low-temperature ice and snow climate and the marine climate of the Nordic region, the car body corrosion protection process is required to be extremely high.

[0003] At present, commercial vehicles are thin-shell car bodies of full-stamping structure, and the same corrosion protection process as passenger vehicles is adopted. After cold-rolled sheet stamping and welding, processes such as electrophoresis and spray finishing are performed. The above car body corrosion protection process is widely used, but still has the following deficiencies:

[0004] At present, the electrophoretic paint film thickness of the exterior and the interior of the car body improves the corrosion protection performance to a certain extent, but in the environment of the road under the low-temperature ice and snow climate using a large amount of snow-melting agent and the marine climate, it is still difficult to meet the requirements, so that the car body is frozen with a large amount of ice and snow containing the snow-melting agent at the lower skirt part of the car body in the ice and snow weather and on the road using a large amount of snow-melting agent, which will cause early rust of the skirt edge of the car body. SUMMARY

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a car body coating structure for use in low-temperature cold zone climate, which is used to solve the problem of poor car body corrosion protection effect in the cold zone climate.

[0006] The technical scheme for solving the above technical problem is as follows: a car body coating structure for use in low-temperature cold zone climate, comprising:

[0007] an electrophoretic layer coated on the inner and outer surfaces of the car body;

[0008] a middle coating layer coated on the electrophoretic layer on the outer surface of the car body;

[0009] a finishing layer coated on the middle coating layer;

[0010] a hydrophobic layer coated at least on the finishing layer on the outer surface of the skirt edge of the car body.

[0011] Compared with the prior art, the above technical scheme has the following beneficial effects:

[0012] By spraying the hydrophobic layer on the outer side of the skirt edge of the car body where the ice and snow are easily contacted, the ice and snow contacting the hydrophobic layer at this position is not easy to freeze, and even if the ice layer frozen on the surface of the hydrophobic coating is removed, a large amount of snow is frozen on the outer skirt of the car body, and the corrosion of the snow-melting agent to the skirt edge is reduced.

[0013] On the basis of the above technical solutions, the embodiments of the present application can also be improved as follows:

[0014] In an embodiment, the anticorrosive coating is coated on the electrophoretic layer of the lower surface of the vehicle body and the inner surface of the skirt.

[0015] In an embodiment, the anticorrosive coating is coated on the electrophoretic layer of the lower surface of the vehicle body and the inner surface of the skirt.

[0016] In an embodiment, the anticorrosive coating is coated on the electrophoretic layer of the lower surface of the vehicle body and the inner surface of the skirt.

[0017] The surface primer layer is coated on the surface polished surface primer layer.

[0018] The surface primer layer is coated on the surface polished surface primer layer.

[0019] In an embodiment, the surface energy of the hydrophobic layer is not more than 40 mN / m.

[0020] In an embodiment, the thickness of the hydrophobic layer is greater than or equal to 40 microns.

[0021] In an embodiment, the dry film thickness of the anticorrosive coating is greater than or equal to 100 microns.

[0022] In an embodiment, the total thickness of the electrophoretic layer, the intermediate coating layer and the surface coating layer is greater than or equal to 150 microns.

[0023] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0024] 1. By spraying a hydrophobic layer on the outside of the skirt of the vehicle body, the part is not easy to freeze, even if the ice layer frozen on the surface of the hydrophobic coating is particularly easy to remove, reducing the corrosion of the skirt by the snow melting agent in the ice and snow.

[0025] 2. The double protection layer formed by the anticorrosive coating and the impact resistant layer sprayed on the electrophoretic layer effectively avoids the rust problem caused by the bottom hem of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0027] Figure 1 The structure of the present application is shown in the figure.

[0028] Reference signs:

[0029] 1, car body; 2, electrophoretic layer; 3, anticorrosive coating; 4, impact-resistant layer; 5, midcoat; 6, basecoat; 7, varnish layer; 8, hydrophobic layer. DETAILED DESCRIPTION

[0030] The embodiments of the technical scheme of the utility model will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, and therefore only serve as examples, and cannot limit the protection scope of the utility model.

[0031] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meaning understood by the technical personnel in the field of the utility model.

[0032] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0033] In addition, the terms "first", "second", and the like are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0034] In the present application, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0035] Embodiment

[0036] As Figure 1 shown, the utility model provides a kind of car body 1 coating structure for low temperature cold zone climate, it includes: electrophoretic layer 2, midcoat 5, basecoat and hydrophobic layer 8 arranged in sequence.

[0037] The electrophoretic layer 2 is coated on the inner and outer surfaces of the vehicle body 1 and the inner cavity of the vehicle frame by electrophoresis, the intermediate coating layer 5 is coated on the electrophoretic layer 2 on the outer surface of the vehicle body 1, and the outer surface of the vehicle body 1 specifically includes the outer surface of the vehicle frame, the door frame, the inner side of the vehicle door and the like, and the topcoat layer is coated on the intermediate coating layer 5, and specifically, after the intermediate coating layer 5 is polished, the topcoat layer is sprayed on the intermediate coating layer 5.

[0038] The topcoat layer includes a topcoat base layer 6 and a varnish layer 7, and the varnish layer 7 is coated on the topcoat base layer 6 after polishing.

[0039] The hydrophobic layer 8 is at least coated on the topcoat layer on the outer surface of the skirt of the vehicle body 1, and the dry film thickness of the hydrophobic layer 8 is 40-50 μm.

[0040] By spraying the hydrophobic layer 8 on the outer side of the skirt of the vehicle body 1 which is easy to contact ice and snow outside the topcoat layer, when ice and snow contact the hydrophobic layer 8 here, it is not easy to freeze, and even if it freezes, the ice layer on the surface of the hydrophobic coating is particularly easy to remove. Reduce the freezing of a large amount of snow on the outer skirt of the vehicle body 1, reduce the corrosion of the melting agent to the skirt.

[0041] The surface energy of the hydrophobic layer 8 is not more than 40 mN / m, the thickness of the hydrophobic layer 8 is ≥40 μm, and the contact angle of the hydrophobic layer 8 is not less than 130°.

[0042] Due to the sharp edge effect of the electrophoretic paint, the electrophoretic paint film on the edge of the folded edge and the process hole is relatively thin, in order to avoid this sharp edge effect, the electrophoretic layer 2 on the lower surface of the vehicle body 1 and the inner surface of the skirt is coated with a corrosion-resistant coating, the corrosion-resistant coating uses a two-component nano corrosion-resistant coating, and the dry film thickness formed is not less than 100 μm, solving the problem of early rusting of the electrophoretic paint film on the edge of the folded edge and the process hole of the vehicle bottom.

[0043] Further, in order to improve the impact resistance of the vehicle bottom, the surface of the corrosion-resistant coating is coated with an impact-resistant layer 4, the dry film thickness of the impact-resistant layer 4 is not less than 1 mm, and the impact-resistant layer 4 mainly prevents the damage of the internal coating caused by the stones splashed by the tires, and the impact-resistant layer 4 is sprayed on the bottom of the vehicle body 1, the inner side of the skirt and the lower part of the wheel cover.

[0044] In the embodiment, in order to improve the protection effect of the vehicle paint, the total thickness of the electrophoretic layer 2, the intermediate coating layer 5 and the topcoat layer is ≥150 μm, wherein the thickness of the electrophoretic layer 2 is not less than 30 μm, the thickness of the intermediate coating layer 5 is not less than 35 μm, the thickness of the topcoat layer is not less than 50 μm, and the thickness of the varnish layer 7 is not less than 40 μm. Under the premise of ensuring the corrosion resistance of the outer surface of the whole vehicle, the appearance of the paint film of the vehicle body 1 is also improved, and the DOI of the paint film of the whole vehicle is ≥88.

[0045] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A body coating structure for use in low-temperature cold climate, characterized in that The application relates to a coating system for a vehicle body, comprising: an electrophoretic layer applied to the inner and outer surfaces of the vehicle body; a midcoat layer applied to the electrophoretic layer on the outer surface of the vehicle body; a topcoat layer applied to the midcoat layer; a hydrophobic layer applied to at least the topcoat layer on the outer surface of the skirt of the vehicle body.

2. The automotive body coating structure according to claim 1, characterized by The electrophoretic layer on the lower surface of the vehicle body and the inner surface of the skirt is coated with a corrosion protection layer.

3. The automotive body coating structure according to claim 2, characterized in that, The surface of the corrosion protection layer is coated with an impact-resistant layer.

4. The automotive body coating structure according to claim 3, characterized by The topcoat layer comprises: a topcoat base layer; a clearcoat layer applied to the topcoat base layer after surface grinding.

5. The automotive body coating structure according to claim 1, characterized by The surface energy of the hydrophobic layer is not more than 40 mN / m.

6. The automotive body coating structure according to claim 5, characterized by The thickness of the hydrophobic layer is not less than 40 microns.

7. The automotive body coating structure according to claim 2, characterized by The dry film thickness of the corrosion protection layer is not less than 100 microns.

8. The automotive body coating structure according to claim 1, characterized by The total thickness of the electrophoretic layer, the midcoat layer and the topcoat layer is not less than 150 microns.

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