JPH04128043A - Resin decorative product and manufacture thereof - Google Patents

Abstract

PURPOSE:To obtain a resin decorative product excellent in abrasion resistance and oil resistance by providing a decorative part on the single surface of a sheet composed of a polyamide type synthetic polymer material using isocyanate cured polyurethane type ink and applying an isocyanate cured polyurethane type adhesive to the surface printed with the decorative part of the sheet to integrate the sheet with the body. CONSTITUTION:A decorative part 2 is printed on the rear of a sheet 1 composed of a punched polyamide type synthetic polymer using isocyanate cured urethane type ink. Next, the sheet 1 is dried for about 1hr at room temp. and an isocyanate cured urethane type adhesive is applied to the entire rear of the sheet 1. The sheet 1 having the adhesive layer 3 formed thereto is inserted in the movable mold 21 of a mold so that the adhesive layer 3 becomes inside and, further, a resin composed of nylon 6 is injected in the fixed mold 22 of the mold from a cylinder through a runner 23. The resin is injected in the mold by this method and a resin plate 4 is taken out of the mold along with the integrally molded sheet 1 to obtain a molded product 5. By this constitution, effect excellent in abrasion resistance and oil resistance can be displayed.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention relates to resin ornaments in which a design pattern or a decorative pattern is applied to the surface of the panel, particularly for automobile windows or decorative panels, and for housing. This invention relates to resin ornaments that can be used for windows, toys, etc., and their manufacturing method.

(Prior Art) Conventionally, spray painting methods, screen printing methods, hot stamping methods, and the like are known and widely used as methods for painting patterns on panel surfaces. In these methods, since a pattern is applied to a pre-formed resin using ink or the like, the surface of the resin has unevenness due to the pattern, and this unevenness causes wear of the pattern. An invented method for preventing this wear is disclosed in Japanese Patent Application Laid-open No. 12074/1983. This method involves laminating a heart coat film applied to prevent friction and a plastic film with a pattern printed on the surface of the resin, and a plastic film coated with a hard coat film on the back side of the resin. This is a method of manufacturing patterned glass by molding resin to create a pattern. The surface of the patterned glass formed by this method is covered with a hard coat film, so the pattern does not easily wear out.

(Problems to be Solved by the Invention) However, in the above-mentioned method, since the hard-coated plastic film is made of polycarbonate resin, it has poor oil resistance and has problems such as peeling.

Therefore, the technical objective of the present invention is to provide a resin decorative article with excellent wear resistance and oil resistance.

(Structure of the Invention) (Means for Solving the Problem) The technical solution taken in the present invention to solve the above technical problem is to coat isocyanate-cured polyurethane on one side of a sheet made of a polyamide-based synthetic polymer material. A decorative portion is printed with a polyurethane-based ink, an isocyanate-cured polyurethane adhesive is applied to the surface of the sheet on which the decorative portion is printed, and the adhesive surface of the sheet is made of polyamide-based adhesive formed by injection molding. This is a resin decorative item in which the sheet and the main body are integrated so as to face the main body of the synthetic polymer material.The resin decorative part is also made of (a) a terminally amide-based synthetic polymer material. a step of printing a decorative portion on one side of the sheet with an isocyanate-cured polyurethane ink; (b) a step of applying an isocyanate-cured polyurethane adhesive to the surface of the sheet on which the decorative portion is printed; (c) (d) closing the mold and injecting a polyamide-based synthetic polymer material into the mold; The manufacturing method includes a step of integrally molding the molded product with a polyamide-based synthetic polymer material, and (e) a step of taking out the molded product from the mold.

Sheet z is composed of polyamide-based synthetic polymers, such as 6,6 nylon, 6.10 nylon, 6-
Nylon, 7-nylon, 11-1-ylon, etc. can be used.

(Function) According to the present invention, since the sheet and the main body are made of a polyamide-based synthetic polymer with excellent oil resistance, they do not easily peel off even when immersed in oil. Therefore, a resin decorative article with excellent oil resistance can be obtained.

(Example) An example of the present invention will be described based on FIGS. 1 to 7.

FIG. 1 shows a sheet 1 made of polyamide synthetic polymer. This sheet 1 is punched out in the same shape as the resin molded product, and in this embodiment, a sheet made of 6-nylon (manufactured by Toshi, rcM1021.) with a thickness of 0.3 mm is used.

The back side of the punched sheet 1 was coated with isocyanate-cured urethane ink (5SNY white from Toyo Ink).
The decorative portion 2 is printed as shown in FIG. 1 by screen printing using 5 parts by weight of 5SNY additive, also available from Toyo Ink. FIG. 2 shows a cross-sectional view of the sheet 1 after the decoration 2 has been printed. In this way, the decorative portion 2 is printed on the back side of the sheet 1 and is not printed on the front side.

The printed sheet 1 of the decorative part 2 was dried at room temperature for about 1 hour, and then an isocyanate-cured urethane adhesive (Toyo Ink's 5SNY medium per 100 parts by weight,
The 5SNY additive (also from Toyo Ink) was applied to the entire back surface of the sheet 11 by screen printing. The sheet 1 on which the adhesive layer 3 was formed in this way was
After drying for 30 minutes at 30°C to volatilize the solvent in the adhesive, the sheet 1 is inserted into the movable mold 21 of the mold so that the adhesive layer 3 of the sheet 1 is on the inside, as shown in FIG.

Next, a resin made of 6-nylon (manufactured by Toshi, rcM1021s black) was applied to the liner 2 from a cylinder (not shown).
3 and flow into the fixed mold 22 of the mold. At this time, the injection conditions were a mold temperature of 60 degrees, a mold temperature of 240 degrees, and an injection time of 15 seconds.

In this manner, resin was injected into the mold, and the resin plate 4 and the integrally molded sheet 1 were taken out from the mold to obtain a molded product 5 shown in FIG.

In this example, the additive for the isocyanate-cured urethane ink was 5 parts by weight, but it can be appropriately selected within the range of 5 to IO parts by weight. Similarly, for isocyanate-cured urethane adhesives, the additive may be added in an amount of 5 to IO parts by weight. Further, the sheet 1 may be punched out in advance into a shape similar to the molded product 5 before the decorative portion 3 is printed as in this embodiment, or it may be punched out after the decorative portion 3 is printed.

FIG. 7 shows a sectional view taken along line CC in FIG. 6.

As shown in FIG. 7, the resin plate 4 and the sheet 1 are integrally bonded with an adhesive 3 so as not to be separated. Therefore, the ink portion printed on the back surface of the sheet 1 and forming the decorative portion 2 is interposed between the sheet 1 and the adhesive 3. In this way, the decorative portion 2 is cut off from contact with the outside by the sheet 1 and is always protected by the sheet 1. Therefore, the resin ornament of this example exhibits excellent wear resistance and stiffness.

Furthermore, in the past, when the area ratio of the decorative part to the surface area of the molded product was large, the adhesion between the decorative part and the adhesive was a problem, but in this example, the decorative part 2 and the adhesive 3 are the same. Since it uses isocyanate-cured urethane material, it has good adhesion and does not peel off.

Furthermore, since polyamide-based synthetic polymers are used for both the molding material and the sheet material, they have excellent oil resistance and do not peel off even when immersed in oil for a long time.

"Evaluation of Examples" The resin ornaments of the examples described above were tested for oil resistance, abrasion resistance, and moist heat cycling resistance as follows.

First, as for oil resistance, the product was immersed in a 70 degree brake flute' (Toyota genuine '2400HJ) for 96 hours and its appearance was observed.

Regarding abrasion resistance, a No. 6 cotton cloth specified by JIS was sandwiched between the indenter 6 and the sheet 1 of the molded product 5, and a flat abrasion tester (Suga Tester, FR-P type) was used to measure the wear resistance as shown by the arrow. It was reciprocated 1000 times in the direction with a load of 500 g and the appearance was observed. The indenter 6 is made of Fe12 specified by JIS, and has a radius of 10 mm at the tip and a width of 20 mm, as shown in FIG.

Regarding the heat and humidity cycling property, 5 cycles were carried out, with one cycle consisting of leaving the sample in a 95% humidity environment at 50 degrees Celsius for 17.5 hours, and then leaving it at 100 degrees Celsius for 5 hours.

For oil resistance, abrasion resistance, and heat and humidity cycle resistance, the appearance was observed after the above test to check for peeling. The test results of the molded article in this example were good in terms of oil resistance, abrasion resistance, and heat and humidity cycle resistance, and no peeling was observed.

Comparative Example 1J As Comparative Example 1, a resin ornament was manufactured by the method shown below. First, using nylon 6 (same as in Example), a resin plate 4 shown in FIG. 9 was manufactured by injection molding. Thereafter, the decorative portion 2 was printed on the surface of the resin plate 4 by screen printing using an isocyanate-cured urethane ink (same as in the example) to produce a molded article 10 shown in FIG. 10.

FIG. 11 shows a sectional view taken along line E-E in FIG. 1O. As shown in FIG. 11, the decorative portion 2 remains as a convex portion on the surface of the molded product 10.

"Comparative Example 2" As Comparative Example 2, a molded product was manufactured using basically the same materials and the same procedure as in the above-mentioned Example, but without applying an adhesive to the back surface of the sheet.

Comparative Example 3j As Comparative Example 3, the material was basically the same as in the above-mentioned example, and the same procedure was used, except that an ethylene vinyl acetate (EVA) adhesive was used as the adhesive applied to the back side of the sheet, and molding was performed. manufactured a product.

"Conventional Example J As a conventional example, a molded article was manufactured using a material disclosed in Japanese Patent Application Laid-Open No. 120741/1983.

That is, a pattern portion was screen printed on a polycarbonate sheet using ink made of polyester resin. The sheet was inserted into a mold so that the printed side of the sheet was on the inside, and polycarbonate resin was injection molded into the mold to produce a resin ornament.

"Evaluation of Comparative Examples 1 to 3 and conventional examples" Comparative Example 1
Comparative Example 3 to Comparative Example 3 and the conventional example were tested for oil resistance and abrasion resistance in the same manner as in the Examples. In addition, Comparative Example 2, Comparative Example 3, and Conventional Example, each having a sheet on the surface of the decorative part, were also tested for moisture and heat cycle resistance. The test results are shown in Table 1. In the table, O indicates no abnormality, and × indicates peeling of the sheet or missing letters. Comparative Example 1, which did not use a sheet, had poor oil resistance and abrasion resistance, and missing letters were observed.

Comparative Example 2, in which the sheet and the resin part were integrated without using an adhesive, had good abrasion resistance, but poor oil resistance and wet heat cycle resistance, and peeling of the sheet was observed.

In addition, in Comparative Example 3, which used an adhesive different from that of the example, that is, an ethylene vinyl acetate adhesive, no problems were observed in oil resistance and abrasion resistance, but the moisture and heat cycle resistance was poor. However, peeling of the sheet was also observed.

Furthermore, although the conventional example had good abrasion resistance and moisture-heat cycling resistance, there was a problem with oil resistance, and peeling of the sheet was observed.

〔Effect of the invention〕

According to the resin decorative article obtained by the present invention, the main body and the sheet are integrally bonded with an adhesive so as not to peel off. Since the ink portion printed on the back side of the sheet and forming the decorative part is interposed between the sheet and the adhesive, the decorative part is cut off from contact with the outside by the sheet.
Always protected by a sheet. Therefore, the resin ornament of this example exhibits excellent wear resistance.

In addition, in the past, when the area ratio of the decorative part to the surface area of the molded product was large, the adhesion between the decorative part and the adhesive was a problem, but in this example, the main body and the adhesive are made of the same isocyanate curing material. Since it uses a urethane-based material, it has good adhesion, excellent heat and humidity cycle resistance, and does not peel off.

Furthermore, since polyamide-based synthetic polymers are used for both the molding material and the sheet material, they have excellent oil resistance and do not peel off even when immersed in oil for a long time.

Table 1

[Brief explanation of drawings]

1 to 7 show embodiments of the present invention, FIG. 1 is a sheet with a decorative part printed on the back side, and FIG.
3 is a sectional view taken along line A, FIG. 3 is a sheet coated with adhesive, FIG. 4 is a sectional view taken along line B-B in FIG. 3, and FIG. 5 is a sectional view of an injection mold. Figure 6 shows the molded product, Figure 7 shows the 6th part.
A sectional view taken along line CC in the figure is shown. Figure 8 shows the indenter used in the wear test, Figure 9 shows the resin plate of Comparative Example 1, and Figure 10 shows the indenter used in the wear test.
The figure shows a molded product of Comparative Example 1, and FIG. 11 is a sectional view taken along line E--E in FIG. 1O. Explanation of symbols: 1. Sheet, 2. Decorative part (ink part), 3. Adhesive material, 4. Resin plate (main body).

Claims (1)

[Scope of Claims] 1. A decorative portion is printed on one side of a sheet made of a polyamide-based synthetic polymer material with an isocyanate-cured polyurethane ink, and an isocyanate-cured polyurethane ink is printed on the surface of the sheet on which the decorative portion is printed. adhesive is applied,
A resin decorative article in which the sheet and the main body are integrated so that the adhesive surface of the sheet faces the main body of a polyamide-based synthetic polymer material formed by injection molding. 2. (a) Printing a decorative portion on one side of a sheet made of a polyamide-based synthetic polymer material with isocyanate-cured polyurethane ink; (b) Printing a decorative portion on one side of the sheet on which the decorative portion is printed with isocyanate-curing. (c) attaching the sheet to the cavity with the adhesive side facing inside; (d) closing the mold and applying a polyamide-based synthetic polymer material. A method for manufacturing a resin decorative article, comprising the steps of: injecting the sheet into the mold and integrally molding the sheet and the polyamide-based synthetic polymer material; and (e) taking out the molded article from the mold.