Polyurea anti-cracking coating and automobile with same

Abstract

A polyurea anti-cracking coating comprises a polyurea layer, a metal layer and a bonding layer, the polyurea anti-cracking coating is prepared through a spraying process, the bonding layer and the polyurea layer are sprayed on the outer side of the metal layer, the bonding layer is clamped between the polyurea layer and the metal layer and is bonded with the polyurea layer and the metal layer into a whole, and the metal layer is coated with the bonding layer. The polyurea layer comprises a first polyurea layer and a second polyurea layer, the first polyurea layer and the second polyurea layer are located outside the two opposite faces of the metal layer respectively, the first polyurea layer is located on the pressed side of the metal layer, and the second polyurea layer is located on the pulled side of the metal layer. The thickness of the first polyurea layer is smaller than that of the second polyurea layer.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, in particular to a polyurea anti-cracking coating and a car having the same. Background Art

[0002] Nowadays, more and more car companies use lightweight metal materials to manufacture car bodies. Car bodies made of lightweight metal have the advantage of being light in weight. However, due to the low ductility of lightweight metal materials, they are more likely to crack in the event of a collision, causing the car body structure to break, greatly reducing the energy absorbed by the car body during the collision, so the car body safety factor is not high.

[0003] Polyurea coating is a polymer coating with strong anti-corrosion and waterproof properties, and is widely used in large-scale infrastructure projects and construction engineering fields. Summary of the invention

[0004] The present invention provides a polyurea anti-cracking coating for preventing a vehicle body structure from breaking, comprising a polyurea layer, a metal layer and an adhesive layer, wherein the polyurea anti-cracking coating is made by a spraying process, wherein the adhesive layer and the polyurea layer are sprayed on the outer side of the metal layer, wherein the adhesive layer is sandwiched between the polyurea layer and the metal layer and is respectively bonded to the polyurea layer and the metal layer as a whole, wherein the polyurea layer comprises a first polyurea layer and a second polyurea layer, wherein the first polyurea layer and the second polyurea layer are respectively located on the outer sides of two opposite sides of the metal layer, wherein the first polyurea layer is located on the compressive side of the metal layer, wherein the second polyurea layer is located on the tensile side of the metal layer, and wherein the thickness of the first polyurea layer is less than the thickness of the second polyurea layer.

[0005] Furthermore, the adhesive layer is composed of epoxy resin glue.

[0006] Furthermore, the metal layer is composed of any one of cast aluminum and boron steel.

[0007] Furthermore, the adhesive layer includes a first adhesive layer and a second adhesive layer, the first adhesive layer is sprayed between the metal layer and the first polyurea layer and used to bond the first polyurea layer to the metal layer, and the second adhesive layer is sprayed between the metal layer and the second polyurea layer and used to bond the second polyurea layer to the metal layer.

[0008] Furthermore, a thickness ratio of the first polyurea layer to the second polyurea layer is 1:2.

[0009] Furthermore, the thickness of the metal layer is smaller than the thickness of the first polyurea layer.

[0010] Furthermore, a thickness ratio of the first polyurea layer, the second polyurea layer and the metal layer is 1:2:1.

[0011] Furthermore, the present invention also includes an automobile having the aforementioned polyurea anti-cracking coating, wherein the polyurea anti-cracking coating is arranged on a structure of the automobile body that is prone to collision and impact.

[0012] Furthermore, the polyurea anti-cracking coating is arranged in a center channel area of ​​the front panel.

[0013] Furthermore, the first polyurea layer is arranged on the compression side of the dash panel facing the front of the vehicle body, and the second polyurea layer is arranged on the tension side of the dash panel facing the rear of the vehicle body.

[0014] The polyurea anti-cracking coating provided by the present invention sprays the polyurea coating on the two opposite sides of the lightweight metal material, and the first polyurea layer and the second polyurea layer are respectively bonded to the metal layer from two directions by epoxy resin glue and protect the metal layer, thereby providing the metal material with improved impact resistance and fracture resistance from the compression side and the tension side, respectively. Since the coating thickness on the compression side is less than the coating thickness on the tension side, the structural fracture caused by bending and deformation of the compression side toward the tension side when impacted is further prevented. Within the limited cost and weight adjustment space, the impact resistance of the metal material when facing collision impact is greatly enhanced, and the collision safety performance of the vehicle body is improved without affecting the weight advantage of the vehicle body made of lightweight metal materials. The polyurea anti-cracking coating in the present invention has the advantages of simple structure, light weight, and high ductility improvement efficiency, and is particularly suitable for large flat vehicle body parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the polyurea anti-cracking coating provided by the present invention.

[0016] Figure 2 It is an axonometric view of the front panel in the present invention.

[0017] Figure 3 It is a rear view of the front panel in the present invention. DETAILED DESCRIPTION

[0018] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the present invention is described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0019] The terms "first", "second", "third", "fourth" and the like in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence.

[0020] It should be noted that the directional terms such as "X direction", "Y direction" and "Z direction" in this specification refer to the "body X direction", "body Y direction" and "body Z direction" commonly used in the automotive field, respectively. The "body X direction" refers to the length direction of the body, and is also the front-to-back direction, with the front direction as the positive direction; the "body Y direction" refers to the width direction of the body, with the direction from the cab side to the door side as the positive direction; the "body Z direction" refers to the height direction of the body, and is also the gravity direction and the up-down direction, with the opposite direction of the gravity direction as the positive direction. In addition, the "outside" and "inside" in this specification refer to the relative directions between the inside and the outside of the polyurea anti-cracking coating structure itself.

[0021] See also Figure 1 The polyurea anti-cracking coating of the present invention is a coating made using a spraying process, and is particularly suitable for a car body made of a lightweight metal material. The polyurea anti-cracking coating of the present invention includes a polyurea layer, a metal layer 4 and an adhesive layer 3. The adhesive layer 3 and the polyurea layer are sprayed on the outside of the metal layer 4. The adhesive layer 3 is sandwiched between the polyurea layer and the metal layer 4 and is bonded to the polyurea layer and the metal layer 4, respectively. Specifically, the polyurea anti-cracking coating of the present invention is a composite sandwich structure in which the metal layer 4 is located on the innermost side and the polyurea layer is located on the outermost side. The metal layer 4 and the polyurea layer are bonded together by the adhesive layer 3 located therebetween. In actual preparation, the adhesive layer 3 must be sprayed on the outside of the metal layer 4 first, and then the polyurea layer must be sprayed on the outside of the adhesive layer 3. The polyurea anti-cracking coating prepared in this way has the advantages of simple structure, light weight, and many adaptable components. It can improve its energy absorption performance without affecting the weight advantage of the car body brought by the use of lightweight metal materials, thereby improving the collision safety performance of the car body. In a preferred embodiment of the present invention, the metal layer 4 is composed of either cast aluminum or boron steel, with lightweight cast aluminum being the best because it is lighter and has poorer ductility than boron steel. When combined with the polyurea anti-cracking coating of the present invention, it has better economic benefits and is highly efficient in improving ductility; the adhesive layer 3 is composed of an epoxy resin adhesive with high adhesion.

[0022] Further, the polyurea layer of the present invention includes a first polyurea layer 1 and a second polyurea layer 2, and the first polyurea layer 1 and the second polyurea layer 2 are respectively located on the outside of the two opposite sides of the metal layer 4. Specifically, the first polyurea layer 1 and the second polyurea layer 2 are sprayed on the outside of the two opposite sides of the metal layer 4, and the polyurea anti-cracking coating of the present invention also includes a first adhesive layer 31 for bonding the metal layer 4 and the first polyurea layer 1 and a second adhesive layer 32 for bonding the metal layer 4 and the second polyurea layer 2. It is easy to understand that the first polyurea layer 1 and the second polyurea layer 2 are respectively located on the outside of the two opposite sides of the metal layer 4. The polyurea anti-cracking coating designed in this way can protect the metal layer 4 from two opposite directions, absorb part of the impact energy from any direction to reduce the impact force, and on the other hand, it can also improve the overall ductility of the polyurea anti-cracking coating and delay the generation and expansion of metal fractures caused by collision impact. In a preferred embodiment of the present invention, the first polyurea layer 1 is sprayed on the side of the metal layer 4 facing the impact, that is, the pressure side, and the second polyurea layer 2 is sprayed on the back side of the first polyurea layer 1, that is, the tension side. When a collision occurs, the first polyurea layer 1 on the pressure side directly faces the impact, first absorbing and reducing part of the impact force, and the second polyurea layer 2 on the opposite back side of the metal layer 4 slows down the impact on the metal layer 4, reduces the overall bending deformation of the metal layer 4, and prevents it from breaking.

[0023] Please refer to Figure 1In particular, the thickness of the first polyurea layer 1 in the present invention is less than the thickness of the second polyurea layer 2, that is, the coating thickness on the compression side is less than the coating thickness on the tension side, and the thickness of the metal layer 4 is less than or equal to the thickness of the first polyurea layer 1. At present, the traditional application of polyurea coatings mainly utilizes its waterproof, corrosion-resistant, salt-resistant, and high-temperature-resistant characteristics, and achieves the purpose of improving its life and durability by applying or spraying it on the outer surface of designated equipment or materials, thereby protecting the structure inside the polyurea coating. For lightweight metal materials, especially light metals such as cast aluminum used to make car bodies in the automotive industry, although applying or spraying polyurea coatings on the outside or a single surface can also improve its corrosion resistance, salt resistance, high-temperature resistance and other properties, the improvement of its fracture resistance and impact resistance is relatively limited. The first polyurea layer 1 and the second polyurea layer 2 in the present invention are respectively bonded to the metal layer 4 from two directions by epoxy resin glue and protect the metal layer 4, providing the metal layer 4 with improved impact resistance and fracture resistance from the compression side and the tension side, respectively. Since the coating thickness on the compression side is less than the coating thickness on the tension side, the structural fracture caused by bending and deformation of the compression side toward the tension side when impacted is further prevented. While improving the life and durability of the metal layer 4, within the limited cost and weight adjustment space, the impact resistance of the metal layer 4 when facing collision impact is greatly enhanced. Compared with other solutions such as replacing the body material, it has certain advantages in cost and weight. If the coating thickness on the compression side is greater than the coating thickness on the tension side, the impact resistance and fracture resistance effect cannot be achieved. Since it is a coating rather than a structural change, the polyurea anti-cracking coating of the present invention has good overall economic benefits and a wide range of applications when used on the production line.

[0024] Furthermore, in a preferred embodiment of the present invention, the metal layer 4 is made of cast aluminum with a thickness of 2 mm, the adhesive layer 3 is made of epoxy resin glue, and the first adhesive layer 31, the second adhesive layer 32, the first polyurea layer 1 and the second polyurea layer 2 are sprayed on opposite sides of the metal layer 4, respectively, wherein the first polyurea layer 1 and the second polyurea layer 2 are located at the outermost side of the polyurea anti-cracking coating in this embodiment, and the metal layer 4 is located at the innermost side of the polyurea anti-cracking coating in this embodiment, the thickness ratio of the first polyurea layer 1 to the second polyurea layer 2 is 1:2, and the thicknesses of the first polyurea layer 1 and the second polyurea layer 2 are 3 mm and 6 mm respectively, the first polyurea layer 1 is located on the compression side of the metal layer 4, and the second polyurea layer 2 is located on the tension side of the metal layer 4. The polyurea anti-cracking coating in this embodiment is suitable for the sheet metal structure at the front of the vehicle body, especially on the vehicle body parts with a large plane area, such as: the front panel 5 that often collides with the motor in a head-on collision.

[0025] Similarly, in another preferred embodiment of the present invention, the metal layer 4 is made of boron steel with a thickness of 1 mm, the adhesive layer 3 is made of epoxy resin glue, and the first adhesive layer 31, the second adhesive layer 32, the first polyurea layer 1 and the second polyurea layer 2 are sprayed on opposite sides of the metal layer 4, respectively, wherein the first polyurea layer 1 and the second polyurea layer 2 are located at the outermost side of the polyurea anti-cracking coating in this embodiment, and the metal layer 4 is located at the innermost side of the polyurea anti-cracking coating in this embodiment, and the thickness ratio of the first polyurea layer 1, the second polyurea layer 2 and the metal layer 4 is 1:2:1, that is, the thickness of the metal layer 4 is the same as that of the first polyurea layer 1, the thickness of the first polyurea layer 1 and the second polyurea layer 2 are 1 mm and 2 mm respectively, the first polyurea layer 1 is located on the compression side of the metal layer 4, and the second polyurea layer 2 is located on the tension side of the metal layer 4. The polyurea anti-cracking coating in this embodiment is suitable for the sheet metal structure at the front of the vehicle body, especially on the vehicle body parts with a large plane area, such as: the front panel 5 that often collides with the motor in a head-on collision.

[0026] Please also read Figure 2 and Figure 3 Furthermore, the present invention also includes an automobile, which includes the aforementioned polyurea anti-cracking coating, and the polyurea anti-cracking coating is mainly arranged on the structure of the vehicle body that is prone to collision and impact, such as: the middle channel in the middle of the front panel 5. Specifically, the front panel 5 is one of the vehicle body parts that is most likely to have structural fractures when the vehicle body is hit from the front, and the middle part thereof has a large space designed as a flat area, so it is suitable for the polyurea anti-cracking coating of the present invention. It is easy to understand that there are other parts on the vehicle body that are prone to deformation and fracture in the event of a collision and need to provide energy absorption, such as: side panels, etc. As long as a large flat area can be designed on it as much as possible, the polyurea anti-cracking coating of the present invention can also be adapted to enhance its impact resistance and fracture resistance.

[0027] Please refer to Figure 2 and Figure 3Specifically, in a preferred embodiment of the present invention, the polyurea anti-cracking coating is disposed in the middle channel area of ​​the middle part of the front panel 5 and near the firewall. The front of the front panel 5, that is, the front in the X direction, is provided with the motor of the automobile; the rear of the front panel 5, that is, the rear in the X direction, is provided with the passenger compartment, which is also the driver's footrest area. The metal layer 4 of the polyurea anti-cracking coating in this embodiment is made of cast aluminum with a thickness of 2 mm, and the adhesive layer 3 is made of epoxy resin glue. The first adhesive layer 31, the second adhesive layer 32, the first polyurea layer 1 and the second polyurea layer 2 are sprayed on the opposite sides of the metal layer 4, respectively. The first polyurea layer 1 and the second polyurea layer 2 are located at the outermost side of the polyurea anti-cracking coating in this embodiment, and the metal layer 4 is located at the innermost side of the polyurea anti-cracking coating in this embodiment. The first polyurea layer 1 is located at the compression side of the metal layer 4, and is also the front side of the front panel 5 in the X direction and facing the front of the vehicle. The second polyurea layer 2 is located at the tension side of the metal layer 4, and is also the rear side of the front panel 5 in the X direction and facing the rear of the vehicle. The thickness ratio of the first polyurea layer 1 to the second polyurea layer 2 is 1:2, and the thicknesses of the first polyurea layer 1 and the second polyurea layer 2 are 3 mm and 6 mm respectively. When a collision occurs, the motor located in front of the front panel 5 hits the front panel 5 under the impact force, and the first polyurea layer 1 bears and absorbs this part of the impact force. The second polyurea layer 2 delays the impact on the metal layer 4 on the opposite back side of the front panel 5, reduces the overall bending deformation of the metal layer 4, delays the occurrence and expansion of fracture, and prevents the front panel 5 from breaking to protect the passenger compartment to the maximum extent.

[0028] In summary, the polyurea anti-cracking coating of the present invention sprays the polyurea coating on the two opposite sides of the lightweight metal material, and the first polyurea layer and the second polyurea layer are bonded to the metal layer from two directions by epoxy resin glue and protect the metal layer, respectively, to provide the compression side and the tension side with improved impact resistance and fracture resistance, and because the coating thickness on the compression side is less than the coating thickness on the tension side, the compression side is further prevented from bending and deforming toward the tension side when impacted, causing structural fracture, and within the limited cost and weight adjustment space, greatly enhances its impact resistance when facing collision impact, and improves the collision safety performance of the vehicle body without affecting the weight advantage of the vehicle body made of lightweight metal materials. The polyurea anti-cracking coating of the present invention has the advantages of simple structure, light weight, and high ductility improvement efficiency, and is particularly suitable for large flat vehicle body parts.

[0029] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A polyurea anti-cracking coating, characterized in that: The invention comprises a polyurea layer, a metal layer (4) and an adhesive layer (3), wherein the polyurea anti-cracking coating is manufactured by a spraying process, wherein the adhesive layer (3) and the polyurea layer are sprayed on the outer side of the metal layer (4), wherein the adhesive layer (3) is sandwiched between the polyurea layer and the metal layer (4) and is respectively bonded to the polyurea layer and the metal layer (4), wherein the polyurea layer comprises a first polyurea layer (1) and a second polyurea layer (2), wherein the first polyurea layer (1) and the second polyurea layer (2) are respectively located on the outer sides of two opposite sides of the metal layer (4), wherein the first polyurea layer (1) is located on the compressive side of the metal layer (4), and the second polyurea layer (2) is located on the tensile side of the metal layer (4), and the thickness of the first polyurea layer (1) is less than the thickness of the second polyurea layer (2).

2. The polyurea anti-cracking coating according to claim 1, characterized in that: The adhesive layer (3) is composed of epoxy resin glue.

3. The polyurea anti-cracking coating according to claim 1, characterized in that: The metal layer (4) is made of either cast aluminum or boron steel.

4. The polyurea anti-cracking coating according to claim 1, characterized in that: The adhesive layer (3) comprises a first adhesive layer (31) and a second adhesive layer (32); the first adhesive layer (31) is sprayed between the metal layer (4) and the first polyurea layer (1) and is used to bond the first polyurea layer (1) to the metal layer (4); and the second adhesive layer (32) is sprayed between the metal layer (4) and the second polyurea layer (2) and is used to bond the second polyurea layer (2) to the metal layer (4).

5. The polyurea anti-cracking coating according to claim 1, characterized in that: The thickness ratio of the first polyurea layer (1) to the second polyurea layer (2) is 1:

2.

6. The polyurea anti-cracking coating according to claim 5, characterized in that: The thickness of the metal layer (4) is smaller than the thickness of the first polyurea layer (1).

7. The polyurea anti-cracking coating according to claim 1, characterized in that: The thickness ratio of the first polyurea layer (1), the second polyurea layer (2) and the metal layer (4) is 1:2:

1.

8. A car, characterized in that: It comprises the polyurea anti-cracking coating according to any one of claims 1 to 7, wherein the polyurea anti-cracking coating is arranged on a structure of a vehicle body that is susceptible to collision and impact.

9. The automobile according to claim 8, characterized in that: The polyurea anti-cracking coating is arranged in the middle channel area of ​​the front panel (5).

10. The automobile according to claim 9, characterized in that: The first polyurea layer (1) is arranged on the compression side of the front panel (5) facing the front of the vehicle body, and the second polyurea layer (2) is arranged on the tension side of the front panel (5) facing the rear of the vehicle body.

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