JPH09253577A - Surface modifying method of plastic parts for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently modify the surface of plastic parts to have soft touch and leather-like feeling. SOLUTION: A flexible two-pack type urethane coating material containing 1.5wt.% acrylic resin bead having 1-10μ diameter in a main coating material and having film properties of 60-100% elongation at 20 deg.C, a friction coefficient of 0.2-0.4 and 160-180kg/cm<2> initial elastic coefficient is applied on the plastic parts for automobile in 20-100μm film thickness. In this way, the surface of the plastic is imparted with leather like touch and appearance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface modification method for plastic parts such as those used in automobile bodies.

[0002]

2. Description of the Related Art The following are conventional methods for modifying the surface of plastic parts.

(1) Conventional coating method A method for coating the surface of a plastic part with a one-pack type paint using an acrylic lacquer or a chlorinated polyolefin resin as a base resin or a two-pack type urethane paint using an acrylic polyol resin.

(2) Vinyl chloride winding method A method in which an adhesive material is applied to a resin base material and a vinyl chloride skin material is pressure bonded.

[0005]

However, in such a conventional method for modifying the surface of a plastic part for automobiles, a soft feeling cannot be realized when a hard base resin is used in the coating method, or When a soft base resin is used, there is a problem in that a soft feeling can be realized but a graininess cannot be realized.

Further, in the vinyl chloride winding method,
Since the bonding precision is required, there is a problem that the yield of the process is bad and the cost is increased.

The present invention has been made in view of the above-mentioned conventional problems, and relates to a plastic part for an automobile in which the surface of the plastic part is efficiently modified to have a soft touch and a leather-like texture. An object is to provide a surface modification method.

[0008]

In order to solve the above-mentioned problems, the present invention has a diameter of 1 .mu.
1.5wt of 10μ acrylic resin beads in the base paint
%, Elongation rate at 20 ° C. is 60 to 100%, friction coefficient is 0.2 to 0.4, initial elastic modulus is 160 to 180 kg /
A soft two-component urethane paint having a coating film physical property of cm ² is applied to an automobile plastic part in a film thickness of 20 to 100 μm.
By coating with, the texture and appearance of the plastic surface are made to be leather-like.

[0009]

Embodiments of the present invention will be described below.

Table 1 is a table showing an embodiment of the present invention.

(Embodiments 1 to 3) First, the structure will be described with reference to embodiments. First, paints were prepared according to the respective formulations of Examples 1 to 3 shown in Table 1, an equal amount of mixed solvent of xylene and still acetate was added, and the spray viscosity was adjusted to Ford Cup # 4 (2
The temperature was adjusted to 0 ° C.) for 20 seconds to obtain coating compositions of Examples 1 to 3. Next, each of the coating compositions of Examples 1 to 3 was coated on the ABS material (Y637, manufactured by Ube Saikon, trade name), which is a plastic material, by the following procedure. ABS
After wiping and degreasing the material with isopropyl alcohol, each test paint composition was applied by air spray to a thickness of 40 μm and set at room temperature for 10 minutes.
A test piece was prepared by forced drying at 40 ° C. for 40 minutes.

The coating film performance and coating film physical properties of the plastic test pieces coated with the coating compositions of Examples 1 to 3 were evaluated as described above, and the obtained results are shown in Table 2.

Next, the operation will be described.

The "texture of leather" can be expressed by the following four.

(A) Sliding feeling → friction coefficient (b) slimy feeling → initial elastic modulus (c) soft feeling → elongation (d) graininess → appearance evaluation That is, in order to obtain a leather-like coating, the diameter is 1 μm. ~ 1
Acrylic resin beads of 0μ in the main coating material is 1.5 wt%
Contains, the friction coefficient of the coating film is 0.2 to 0.4, the initial elastic modulus is 1
60 to 180 kg / cm ² , elongation rate 60 to 100% (2
It is effective to apply a soft paint of 0 ° C.) with a film thickness of 20 μm to 100 μm. When the friction coefficient is less than 0.2, a plastic feeling is produced, and when it is more than 0.4, a rubbery texture is obtained. If the initial elastic modulus is more than 180 kg / cm ² , the feel is hard, and if it is less than 160 kg / cm ² , the strength of the coating film is insufficient. If the elongation is less than 60%, the soft feeling is lost, and if it is more than 100%, a sticky feeling occurs. If the diameter of the resin beads is less than 1 μm, the texture will not appear, and if it is greater than 10 μm, the strength of the coating film will be insufficient. If the film thickness is less than 20 μm, a soft feeling cannot be obtained, and 100 μm
If it exceeds the range, it is not preferable because it takes time in spray coating, and problems such as sagging and tarring are likely to occur.

(Comparative Example 1) As a comparative example, the diameter of the acrylic resin beads to be contained in the coating was 10 to 40 µm, and the same formulation as in Example 1 was used to form a coating, and an equal amount mixed solvent of xylene butyl acetate was mixed. Was added to adjust the spray viscosity with Ford cup # 4 (20 ° C.) for 20 seconds to obtain a coating composition of Comparative Example 1. Next, this coating composition was applied to an ABS material, which is a plastic material, in the same manner as in Example 1, the coating film performance and physical properties were measured, and the results are shown in Table 2.

(Comparative Example 2) As Comparative Example 2, 1-component acrylic lacquer type ABS paint Planet AX Matte Gray (trade name, manufactured by Origin Electric Co., Ltd.) was mixed with an equal amount of xylene and butyl acetate. Add and adjust spray viscosity to 12 seconds with Ford Cup # 4 (20 ° C.), Comparative Example 2
Was obtained. The coating film performance and physical properties of this coating composition were measured in the same manner as in Comparative Example 1, and the results are shown in Table 2.

[0018]

[Table 1]

[0019]

[Table 2]

[0020]

As described above, according to the present invention, the diameter of 1 .mu.
Contains 10μ acrylic resin beads, elongation 60% ~
Since a two-component urethane paint having a coating property of 100% (20 ° C.) and a friction coefficient of 0.2 to 0.4 initial elastic modulus of 160 to 180 kg / cm ² is applied to a film thickness of 20 to 100 μm, The effect is that the surface of the plastic part can be efficiently modified to have a soft touch and a texture similar to leather.

Claims (1)

[Claims] 1. The surface of a plastic part has a diameter of 1 μm to
1.5wt of 10μ acrylic resin beads in the base paint
% Contained at 20 ° C., elongation 60 to 100%, friction coefficient 0.2 to 0.4, initial elastic modulus 160 to 180 kg /
A two-component urethane paint having a coating film physical property of cm ^{2 has} a film thickness of 2
A method for modifying the surface of a plastic part for an automobile, characterized in that the texture and the appearance of the plastic surface are made to have a leather tone by coating with a thickness of 0 to 100 μm.