JPS59219353A - Trimming material having excellent resistance to light and weather - Google Patents

Abstract

PURPOSE:To provide a trimming material for vehicles, which does not cause deterioration even when exposed to the atmosphere over a long period of time, consisting of a polyolefin resin compsn. contg. a specified organonickel compd. weathering and light-resistant agent. CONSTITUTION:0.05-2wt% [2,2'-thiobis (4-t-octyl phenolate)]-n-butylaminenickel of the formula is blended with a polypropylene resin such as a polypropylene/ ethylene copolymer having an ethylene content of 5-20%. The resulting resin compsn. is processed into a trimming material in a conventional manner by subjecting it to stages of molding, degreasing (washing with trichloroethane vapor), masking, primer coating, baking, topcoating and baking, said weathering and light-resistant agent remains in the resin compsn. while scarcely dissolving out of the compsn. during the above degreasing stage, so that a member having excellent resistance to light and weather can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an exterior member with excellent light resistance and weather resistance, and particularly to an exterior member used for vehicles, etc. whose non-painted parts do not deteriorate over a long period of time even after painting.

Conventional technology Conventionally, exterior parts made of polypropylene resin materials, such as automobile bumpers and moldings, undergo the following processes: (A) molding;
(B) Degreasing (trichloroethane steam cleaning, 80 seconds x 2
times), (0) masking, CD) primer application, (E
) Baking (80°C x 80 minutes or 120°C x 10
), CF) topcoating, and (G) baking (80°C x 80 minutes or 120°C x 80 minutes). The polypropylene resin material used at this time is usually expressed by the following formula, as described in the antioxidant book published by Taiseisha Co., Ltd., in order to impart light resistance and weather resistance to the exterior member. (2,'J6+6-titramethyl-4-piperidine)sepacade is 0.1 to 1
% or in addition to 0.1 to 1% by weight of this bis(2,2I6,6-tetramethyl-4-piperidine)sepacade, 2(2/-hydroxy-87-t -butyl-5'-methylphenyl)-5-chloroH benzotriazole is added in an amount of 0.05 to 1% by weight. On the other hand, when painting an exterior part, for example, a bumper, the above step (B
), it is necessary to degrease the parts, and trichloroethane steam cleaning is usually used for degreasing. However, when this trichloroethane steam cleaning is carried out, the light emitting agent uniformly diffused in the polypropylene composition becomes active due to the molecular movement of the polypropylene, which is activated by the boiling 1,1.1-trichloroethane vapor. Those present in the thick outer layer are extracted. As shown in Figure 1, the bumper manufactured under these conditions has painted parts A and 0, and non-painted part B, and at least the outer layer of the non-painted part B faces.・Weather resistant agent is eluted
/-), which caused the problem of whitening and deterioration in a short period of time.

DISCLOSURE OF THE INVENTION The present invention has been made by focusing on such conventional problems, and it uses a light emitting (@) agent that is difficult to be eluted by trichloroethane vapor in a polypropylene resin during the degreasing process of pre-painting treatment. The present invention relates to an exterior member with excellent light resistance and weather resistance, in which the non-painted part does not deteriorate for a long period of time under the condition of the naked eye.

The polypropylene resin used in the present invention includes:
Crystalline propylene polymers are preferred, especially ethylene
~20% polypropylene-ethylene copolymer is preferred. In this copolymer, if the ethylene content is less than 5%, the copolymer will be too hard, and if it exceeds 20%, the copolymer will become too soft, which is not preferable.

Next, the light emitting agent used in the present invention is [2,2t'
-thiobis(4-t-octylphenolate)]-]n
-Butylamine nickel, represented by the following formula: Unlike conventional photoreceptors, this photoreceptor is difficult to extract by trichloroethane vapor due to its metal salt structure. If the amount is less than 0.5% by weight, it will not be effective, and if it is added more than 2% by weight, no effect will be obtained, and the physical properties of the material will deteriorate.
．． The range is 0.05 to 2% by weight.

The exterior member of the present invention can be produced in the same manner as the conventional exterior member described above. That is, a polypropylene resin composition containing a predetermined amount of [g,g'-thiobis(4-t-octylphenolate)]-]n-butylamine nickel was mixed into (A) in the same manner as in the molding of a normal molded product. After molding in the process, (B) degreasing (trictetraethane steam cleaning, 8
0 seconds twice), (0) Masking, (D) Primer application, (E) Baking (80℃ x 80 minutes or 120℃ x 10
minute"), (F) topcoat, (G), baking (so"C×
80 minutes or 120"Cx 80 minutes) to produce an exterior member having a desired shape.

The exterior member thus obtained can be used for a long period of time because the unpainted parts do not turn white and deteriorate in a short period of time.

Examples of the invention Example 1 A propylene-ethylene block copolymer (EPP) containing 16% ethylene (MFR2, Og/l 0 min) was mixed with (g, g'-thiobis(4) in the amount shown in Table 1 below). -t-
Octylphenol)))-n-Butylamine nickel is blended as a light emitting agent, and the thickness is 31 mm by injection molding.
A test piece of 1Il+ was prepared. 1 for each of these test pieces
, 1.1-) The average content (by weight) of the light emitting agent and the content (% by weight) of the outer layer with a thickness of 50 μm for those without lychloroethane steam cleaning and those that were cleaned for 60 seconds. The results obtained are also listed in Table 1 below.

From the results shown in Table 1, (2,2'-thiobis(4-t-octylphenol))-n-butylamine nickel has 1
, 1.1-) It is clear that it is difficult to extract by dichloroethane vapor.

Example 2 A sample with a thickness of 8 mm was obtained by injection molding in the same manner as in Example 1, except that, although not shown in Table 2, a light beam machining method was used and carbon black was blended in an amount of 0, bifjff%.

For these samples, after 1,1.1-) 60 seconds of lychloroethane steam cleaning, the average content of photoreceptor,
The content of the outer layer 50 μm part and the occurrence of whitening caused by Tuesday in Okinawa were investigated, and the obtained results are also listed in Table 2. (4-t-octylphenol)))-n-butylamine nickel at 0.
It can be seen that in the samples containing 0.5 to 2% by weight, the light emitting agent hardly eluted and did not deteriorate over a long period of time, compared to the samples containing the conventional light emitting agent.

Effects of the Invention As explained above, the exterior member of the present invention contains (2,2/-thiobis(4-t-octylphenolate)-n-butylamine nickel) as a light emitting agent in an amount of 0.05 to
Because it is made of a polypropylene resin composition containing double N-thin, it can be used for exterior parts with partially unpainted parts, such as automobile bumpers, by trichloroethane steam cleaning as a pre-painting treatment. It also has the advantage of being able to withstand long-term use by preventing outer layer whitening and material deterioration due to short-term exposure to non-painted areas, as the photoresist is not eluted and has excellent light and weather resistance. is obtained. Therefore, it is particularly useful as an exterior material having an unpainted area that is pretreated in a degreasing step with trichloroethane.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of an example of an automobile bumper, and Figure 2 is a cross-sectional view of an example of an automobile bumper.
1 is a perspective view of the automobile bumper shown in FIG. 1... Painted part A and 2... Non-painted part 8 side 8.
...Painted section 0 sides. Patent applicant: Nissan Motor Co., Ltd. Applicant: Mitsubishi Yuka Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] 1 Add 0.05 to 2% by weight of (
g4'-thiobis(4-1-octylphenolate))
- An exterior member with excellent light resistance and weather resistance, characterized by being made of a composition containing n-butylamine nickel.