JPH07145572A - Method of dyeing plastic material - Google Patents

Abstract

PURPOSE:To conduct a practicable dyeing operation without the need for demounting the plastic lens of an automotive lamp from the automotive body, by uniformly coating said lens with a dyeing fluid containing a penetrant, dispersant and dye, etc., followed by leaving the dyeing fluid stand. CONSTITUTION:A portion to be dyed of the plastic lens (e.g. made of an acrylic resin, polycarbonate, polystyrene, polyvinyl chloride, polyacetal, polyurethane) of a lamp used in an automobile is uniformly coated with a dyeing fluid composed of 10-30 pts.wt. of a penetrant (pref. benzyl alcohol or phenol), 5-40 pts.wt. of a dispersant such as Turkey red oil, 1-20 pts.wt. of a dye and a regulator (e.g. water), and after sufficient penetration of the dye, the lens is washed with water and then left to stand in an atmosphere at >=5 deg.C, thus accomplishing the objective dyeing with the resultant lamp presenting distinct on-and-off behavior.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dyeing a plastic material such as a lamp other than a headlamp of an automobile.

[0002]

2. Description of the Related Art Lamps other than automobile headlamps that use a lens made of a plastic material have a function of transmitting a signal to the surroundings by blinking, and the colors of the lamps are limited to red, yellow and transparent.

The greater the difference in blinking of these lamps,
The signal is clearly transmitted to the surroundings, but when the lamp is directly exposed to the sun during daytime driving, the blinking of the lamp becomes unclear.

To address this, the above lamps in modern automobiles are either darkened in color or have a transparent black or smoke cover over the lamp.

[0005]

On the other hand, many of the lamps for automobiles currently on sale do not undergo the above-mentioned treatment. This is a method of dyeing fibers or cloth with the dye, and the material to be dyed is put in a container and boiled for dyeing.

However, some automobile lamps are difficult to remove from the vehicle body and cannot be dyed by the above method.

An object of the present invention is to provide a method for dyeing a plastic material, which can dye a plastic lens of a lamp without removing it from an automobile, for example.

[0008]

According to the method of the present invention, a dyeing solution comprising 10 to 30 parts of a penetrant, 5 to 40 parts of a dispersant, 1 to 20 parts of a dye and a small amount of an adjusting agent is uniformly applied to a part to be dyed. It is characterized in that after application, the dye is allowed to penetrate and is washed with water, and then the relaxed surface is left to cure for a time corresponding to the temperature of the atmosphere.

The above-mentioned plastic materials are applicable to thermoplastic resins such as acrylic, polycarbonate, styrene, vinyl chloride, vinylidene chloride, polyacetal, urethane and acrylic butadiene styrene copolymer.

The penetrant is preferably benzyl alcohol or phenol, the dispersant is preferably funnel oil or another surfactant, and the regulator is water.

Further, the ambient temperature and the leaving curing time are preferably about 25 ° C. and 24 hours, for example.

[0012]

In the present invention, the penetrant relaxes the surface tissue of the plastic to be dyed to widen the intermolecular gaps, and the dye suitably penetrates and is fixed in the tissue after leaving-cured. Definitely dyed.

[0013]

EXAMPLES Examples of the present invention will be described below.

(1) One constitutional example of dyeing solution for acrylic lens Penetrant: Benzyl alcohol 10 g Dispersant: Funnel oil 30 g Dye: 10 g Conditioner: Water 30 g (2) Dyeing procedure a. Mask the area other than the lens of the lamp to be dyed with tape, newspaper, etc. to expose only the acrylic lens. At this time, if there is a metal-plated area or a rubber frame around the lens, this dyeing solution does not stain, so masking is not necessary.

B. The dye solution is applied to the surface of the acrylic lens as evenly as possible.

C. After a penetration time of 1 to 10 minutes (eg 3 minutes), it is washed with water.

D. Since the surface of the acrylic lens has become soft due to relaxation, the acrylic lens is left to cure at an ambient temperature of 25 ° C. for about 24 hours, and naturally waits until the surface returns to the end.

By the above procedure, the surface texture of the plastic lens is relaxed by the penetrating agent benzil alcohol, and the intermolecular gap becomes large.

The dye suitably penetrates into the gaps between the enlarged molecules, and after leaving and curing, the dye is fixed and dyed on the surface layer of the acrylic lens which has returned to its original state.

The penetrant benzil alcohol is 30
If it is more than 10 parts, the structure of the resin will be affected, and if it is less than 10 parts, it will not penetrate.

Further, the dispersant funnel liquid is for improving the dispersion of the benzil alcohol and the dye. When it is 40 parts or more, the viscosity becomes large and the workability is poor, and when it is 5 parts or less, the dispersion is sufficient. It disappears and there is unevenness, and both are impossible.

When the amount of the dye is 20 parts or more, unevenness occurs without being dispersed, and when the amount is 1 part or less, dyeing cannot be performed, and neither is possible.

When benzil alcohol is used as a penetrant, a dyed product can be obtained without destroying the tissue by increasing or decreasing the ratio of benzil alcohol in the dyeing solution according to the molecular weight of the acrylic lens. it can.

Further, the dyeing solution is a kind of non-dyeing agent, physical properties,
Beautiful dyeing can be performed by changing the ratio of the components depending on the molding method.

Further, if the atmosphere temperature at the time of dyeing is 5 ° C. or higher, dyeing is possible, and the density of the dyeing condition can be adjusted depending on the length of time.

[0026]

As described above, according to the present invention, an accident can be prevented by, for example, dyeing the plastic lens of the lamp without removing it from the automobile and increasing the difference in blinking. Therefore, it can be easily implemented in an existing vehicle, which is very convenient.

Further, after the permeation time (1 to 10 minutes) has elapsed, the dye enters the polymer structure, and therefore cannot be rubbed with a cloth, for example. Therefore, it can be put to practical use after the lapse of the permeation time.

Claims (1)

[Claims] 1. A dyeing solution comprising 10 to 30 parts of a penetrant, 5 to 40 parts of a dispersant, 1 to 20 parts of a dye, and a part of an adjusting agent is evenly applied to a dyed part, and the dye permeation time is waited. A method for dyeing a plastic material, which comprises rinsing the relaxed surface for a period of time according to the temperature of the atmosphere after washing with water.