JPH086006B2 - Automotive lighting - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lamp for an automobile (including a two-wheeled vehicle and a motorcycle), and more particularly to a resin material used for a rim, a body, a reflector or the like of the lamp. is there.

(Prior art and its problems) ABS resin is used as a conventional resin for lamps, but when a car is delivered from a car maker to a car dealer, the wax applied to protect the exterior of the car is used. There is a problem that the resin material of the lamp is deteriorated by the chemical (wax remover) used for removing it at the car dealer. Further, it is difficult to say that the surface smoothness and scratch resistance of the lamp, which are factors for maintaining good appearance, are sufficiently satisfied when the lamp is painted.

That is, an object of the present invention is to provide a lamp having excellent chemical resistance, surface smoothness and scratch resistance, such as a wax remover, and a resin material for providing the same.

(Means for Solving the Problems) The present invention uses ABS poly (methyl methacrylate) (PMM
It is a vehicle lamp characterized by comprising a resin material obtained by blending 30) to 70% by weight of A), by which the above problems can be solved and the present object can be achieved.

(Experimental Example / Example) Experimental Example 1 (Chemical resistance test) PMMA having a molecular weight larger than that of AS contained in general ABS resin was blended with ABS resin at a ratio of 0 to 100 wt% to prepare a test piece. After manufacturing, apply wax remover on the surface of the test piece and apply maximum stress of 200 kg / cm ² at 23 ° C for 4 hours, then measure the point where cracks occur and obtain the minimum stress, and test. The pieces were evaluated for chemical resistance. The results are shown in FIG.

As is clear from FIG. 1, it is clear that the curve reaches a saturation at about 70% of rising from about 30% at PMMA wt%.

Experimental Example 2 (Surface Smoothness Test) A test piece similar to that of Experimental Example 1 was prepared, light was incident on the surface of the test piece at 60 °, and light reflected at 60 ° was measured to obtain the light selectivity, and the test piece was obtained. The surface smoothness was evaluated. The photoselectivity and the surface smoothness are in a proportional relationship, and it can be said that the photoselectivity is a numerical value of the surface smoothness. The results are shown in Fig. 2, and it is clear from this graph that the curve reaches saturation at a rising of about 70% from about 30% at PMMAwt%.

Experimental Example 3 (Scratch resistance test) The Rockwell hardness of a test piece similar to that of Experimental Examples 1 and 2 was measured to evaluate the scratch resistance of the test piece. Scratch resistance is in proportion to Rockwell hardness and is a measure of scratch resistance. As shown in FIG. 3, the results show that scratch resistance is improved by blending PMMA with ABS.

Experimental Example 4 (Impact resistance test) In the same manner as in Experimental Example 1, PMMA was changed to 0 to 100 wt% and blended with ABS resin to prepare a 1 / 4-inch notched test piece, and Izod impact strength was measured to perform the test. The impact resistance of the piece was evaluated. As shown in Fig. 4, the result shows that PMMA is 70 wt% or more.
When blended with ABS resin, the impact strength becomes less than 10kg ・ cm / cm and it is not suitable as a resin material for automobile, motorcycle and motorcycle lamps.

That is, it was found from Experimental Examples 1 to 4 that it is ideal if the amount of PMMA resin mixed with the ABS resin is 30 to 70 wt%.

Example As a specific example of the present invention, a rim of an automotive lamp and a body reflecting mirror shown in FIG. 5 were molded using a resin obtained by blending 30 to 70 wt% of PMMA with ABS resin. It was confirmed that the rim and body reflector had improved wax remover resistance, surface smoothness, and scratch resistance compared to the case of molding using only ABS resin.

(Effects of the Invention) The present invention is for a lamp having improved chemical resistance, surface smoothness and scratch resistance without impairing impact resistance by selecting an ABS resin having high impact resistance. A resin material can be provided and PMMA resin waste can be effectively used.

[Brief description of drawings]

FIG. 1 is a graph for evaluating the chemical resistance of the resin material, FIG. 2 is a graph for evaluating the surface smoothness of the resin material, and FIG. 3 is for evaluating the scratch resistance of the resin material. FIG. 4 is a graph for evaluating the impact resistance of the present resin material, and FIG. 5 is a cross-sectional view of a concrete example of a vehicle lighting rim and a body reflecting mirror molded using the present resin material. Is.

Claims (1)

[Claims] 1. A vehicle lamp including a body, a reflecting mirror, a rim, a lens, a bulb, etc., wherein the body, the reflecting mirror and / or the rim is made of ABS resin and polymethylmethacrylate (P).
An automotive lamp characterized by comprising a resin material blended with 30 to 70 wt% of MMA).