JPS6040460B2 - Synthetic resin molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is used by being attached to the side of the body of an automobile etc. for decoration and protection, and is used to prevent the decorative coating layer formed on the surface from peeling off from the base body. This invention relates to a synthetic resin molding on which a protective coating is formed.

Accordingly, the paints used to form the above-mentioned protective coating film (hereinafter referred to as coating film) mainly include one-component polyurethane having an NCO group at the end, and two-component polyurethane consisting of a base agent and a curing agent. be.

However, the coating film 1 formed on the end portion of the molding with these paints may turn yellow due to light and heat, and when it comes into contact with water, water may enter through the contact surface between the coating film 1 and the end portion 2 of the molding body. The area may become white, and all or part of the metal vapor deposited layer 3, intermediate resin layer 4, and surface resin 5 in the decorative coating layer 6 may peel off from the base 7 after the heat resistance test or water resistance test. there were.

The peeling occurs in each layer 3, 4, 5 at the terminal part 2 of the molding body.
, 7 and coating film 1 were not good. In view of the above, the present invention provides that the coating film formed on the end portion of the molding body is resistant to discoloration due to heat, light, etc., and that water does not enter between the contact surface between the coating film and the terminal portion of the molding body. To provide a synthetic resin molding in which the decorative coating layer does not peel off from the base body even after a heat resistance test and a water resistance test.

The gist of this invention is to provide a synthetic resin mold having a decorative coating layer on the surface of the mold body, in which one or more acrylic acids or methacrylic acids are added to 10 parts by weight of the polypynyl chloride copolymer resin. A protective coating film is formed on the end of the molding body using a paint prepared by graft copolymerizing 50 to 30 parts by weight of the alkyl ester in a solvent containing 10 to 7 K% of cyclohexane. It is located in a synthetic resin mall.

Hereinafter, the synthetic resin molding of the present invention will be explained in detail.

In the following explanation, "part J""%" represents "part by weight" and "% by weight", respectively.

The main body of the synthetic resin molding of the present invention consists of a base 7 made of pinyl chloride resin, ABS resin, thermosetting urethane resin, etc., a metal vapor deposited layer 3 made of aluminum or the like, and an intermediate layer made of polyethylene terephthalate or the like. A film-like decorative coating layer 6 consisting of a resin layer 4 and a surface resin layer 5 made of vinylidene fluoride resin or the like is formed integrally with an adhesive.

Furthermore, the paint used in this invention is prepared by dissolving 50 to 30 base parts of one or more types of alkyl esters of acrylic acid or methacrylic acid in 10 parts of a polyvinyl chloride copolymer resin with an organic solvent. Adjustments are made by adding a polymerization catalyst and performing graft copolymerization.

Here, the vinyl chloride copolymer resin refers to one or two monomers such as propylene, vinyl acetate, ethylene, etc.
It is a combination of more than one species.

The polymerization percentage is preferably 70% or more of vinyl chloride. When it is less than 70%, the adhesion with the terminal part of the molding body decreases.

Further, the vinyl chloride vinyl acetate copolymer may be used after being saponified. In addition, in the case of a polymer made only of vinyl chloride,
When used as a paint, it has poor stability, turning red in a heat resistance test of 8000 and turning white in a water resistance test of 40 qo. Examples of alkyl esters of acrylic acid or methacrylic acid include those having an alkyl carbon number of 10 or less, such as n-butyl acrylate, n-propyl acrylate, ethyl acrylate, n-hexylmethyl methacrylate, 2-ethylhexyl acrylate, methyl methacrylate,
Examples include 2-ethylhexyl methacrylate.

If these esters are used in an amount of 50 parts or less based on 100 parts of the vinyl chloride copolymer resin, when used as a paint, the adhesion to each layer of the molding end portion will decrease;
If it is 0 parts or more, it tends to become hard and brittle, and the adhesion with each layer of the end portion of the molding also decreases. Examples of the solvent include methyl acetate, ethyl acetate, n-propyl acetate, n-butyl acetate, benzene, toluene, xylene, and cyclohexanone. Two or more of these solvents are used as a mixture, and the solvent should contain 10 to 70% of cyclohexanone. If the cyclohexanone content is less than 10%, the stability of the paint tends to decrease, and gelled products precipitate.
If the content is 70% or more, cyclohexanone has hygroscopic properties, so the paint adsorbs water and the paint itself tends to whiten.
Examples of the polymerization catalyst include peroxide-based penzoyl peroxide, lauroyl/gu oxide, and rt-butyl peroxide.

Next, in order to form the coating film 1 on the end portion 2 of the molding body, the paint prepared as described above is applied to the cleaned end portion 2 as desired by fat coating, spray coating, brush coating, etc. A cured coating film can be obtained by applying the coating by knife-foot coating, roll coating, or the like, and then drying it at room temperature for several minutes.

In addition, if necessary, electric heat, hot air, or infrared lamps may be used.
A cured coating can be obtained in a few seconds by heating at a temperature below 0.
As shown in Table 1, the synthetic resin molding of the present invention has the above-described structure, and as shown in Table 1, the coating film formed on the end portion of the molding body is resistant to discoloration due to heat, light, etc., and the coating film and the molding body are Water does not enter between the surfaces in contact with the terminals of the decorative coating layer, and therefore, the portions do not whiten, and the decorative coating layer does not peel off from the substrate even after a heat resistance test or a water resistance test.

Examples and comparative examples of the present invention are listed below, and their performance test tables are shown in Table 1.

The mold body is made of vinyl chloride resin mixture at 150-170℃.
The base body 7 is extruded, and a metal vapor deposited layer 3 made of aluminum and an intermediate resin layer 4 made of ethylene terephthalate resin and vinylidene fluoride resin are respectively formed on the base body 7.
A decorative coating layer 6 in the form of a film consisting of a surface resin layer 5 and a surface resin layer 5 was produced by pasting or coextruding the film onto a substrate 7.

At this time, the blending ratio of the vinyl chloride resin mixture is 10 parts of vinyl chloride resin, 30 parts of dioctyl phthalate, 1.5 parts of dilaurate, 2 parts of zinc laurate, and 1 part of dibutyl manlate. Moreover, the paints used in each example were prepared by floating mixtures having the respective compounding ratios shown below at a temperature of 80 to 85q0 for about 5 hours.

In addition, the test pieces in both Examples and Comparative Examples were those in which the paint was applied to the end portion of the molding body with a brush and the pupils were left open for 3 days.

The heat resistance test was conducted using an 80qo open (high quality product name: / Itemp oven HPS-11 model, manufactured by Yubai Seisakusho).
After the 4-valent coating was allowed to stand, discoloration of the coating film and peeling of the decorative coating layer were visually inspected.

The water resistance test was conducted in a 4000 constant temperature snow bath (manufactured by Tawai Seisakusho)
After being left for 24 days, the paint film was visually inspected for discoloration and peeling of the decorative coating layer.

In addition, in the notation of each example below, a is a monomer compound copolymerized with vinyl chloride, its polymerization %, the number of parts of the vinyl chloride copolymer resin, b is an acryl ester and its number of parts, and c is a polymerization catalyst and its number of parts. , d indicate the diluting solvent and the number of parts thereof, respectively.

Example 1 a Vinyl acetate 20% 10 Base part b
Methyl methacrylate 5 anchors Ethyl methacrylate 5 anchors C benzoyl/gu oxide 0.5d cyclohexanone 76 anchors Ethyl acetate
95 Ikarito Butyl Acetate
7 vertical xylene
133 parts Example 2a 10% vinyl acetate, 10% ethylene 10 parts bn-butyl acrylate
5 base n-hexyl acrylate
5 Anchor part c Same as Example 1.

d Same as Example 1.

Example 3 a Same as Example 1.

b Ethyl acrylate Part 2 2-Ethylhexyl methacrylate Part 8 c Same as Example 1.

d Same as Example 1.

Example 4 a Same as Example 1.

bn-propyl acrylate 10 anchors c Same as Example 1.

d Same as Example 1.

Example 5 a Same as Example 1.

b2-Ethylhexyl methacrylate 10 Ankaku c Same as Example 1.

d Same as Example 1.

Example 6 a Vinyl acetate 5%, ethylene 15% 10 Eaves b
Methyl methacrylate 5 bases n Propyl methacrylate 5 bases c Same as Example 1.

d Same as Example 1.

Example 7 a Same as Example 6.

b Methyl methacrylate 3 parts N-propyl methacrylate 7 parts c Same as Example 1.

d Same as Example 1.

Example 8 a Same as Example 2.

b Ethyl acrylate 5 Ikarito 2-
Ethylhexyl methacrylate 5 Anchor part c Same as Example 1.

d Same as Example 1.

Example 9 a Vinyl acetate 10%, propylene 10% 10 Ikarito b Same as Example 4.

c Same as Example 1.

d Same as Example 1.

Example 10 a Vinyl acetate 18%, propylene 2% 10 Ikari b
Ethyl acrylate 5 parts n-Butyl acrylate 5 parts c Same as Example 1.

d Same as Example 1.

Comparative Example 1 The paint used was a two-component polyurethane paint prepared with 100 parts of KU-1M (trade name) manufactured by Konishi Co., Ltd. and 5 parts of KU-1 Fertilizer (trade name).

Comparative Example 2 The paint used was KU manufactured by Konishi Co., Ltd.
It is a two-component polyurethane paint prepared with 10 base parts of -43xA (trade name) and 2 base parts of K.U-43xB (trade name).

Table 1 Method A: Slight yellowing, no peeling (however, it can be used as a product).

B: Slight whitening, no peeling (however, it can be used as a product)
.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a synthetic resin molding having a coating film formed on the end portion of the molding body. 1... (protective) coating film, 2... (terminal part of the molding body), 6... decorative coating layer, 7...
...substrate.

Claims (1)

[Claims] 1. In a synthetic resin molding having a decorative coating layer on the surface of the molding body, 50 to 300 parts by weight of one or more alkyl esters of acrylic acid or methacrylic acid are added to 100 parts by weight of vinyl chloride copolymer resin. , a synthetic resin molding having a structure in which a protective coating film is formed on the end portion of the molding body using a paint prepared by graft copolymerization in a solvent containing 10 to 70 wt% of cyclohexanone.