JPS60162881A - Dyeing of molded polyamide product - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for dyeing polyamide molded articles.

Although polyamide generally has good dyeability, it has drawbacks such as difficulty in dyeing deep colors and uneven dyeing.

As a result of extensive research into dyeing methods for polyamide molded articles, the present inventors found that the above-mentioned drawbacks could be overcome by blending a specific melamine derivative into polyamide, leading to the invention.

The present invention uses polyamide and formula (In the formula, R1 represents a hydrocarbon residue having 1 to 15 carbon atoms.

n is an integer from θ to 5. ) is a method for dyeing a polyamide molded article, which is characterized by dyeing a molded article composed of a melamine derivative represented by the following with an acid dye.

Specific examples of polyamides used in the present invention include nylon 61, nylon 11. Polylactams such as nylon 12, nylon 66, nylon 610. Polyamides obtained from dicarboxylic acids and diamines such as nylon 612, nylon 6/66, nylon 6/66/
Examples include copolyamides such as 610, mixtures thereof, and the like.

Representative examples of melamine derivatives used in the present invention include methylene dimelamine, ethylene dimelamine, trimethylene dimelamine, tetramethylene dimelamine, hexamethylene dimelamine, decamethylene dimelamine, dodecamethylene dimelamine, 1.3 - Cyclohexylene dimelamine, p-fuylylene dimelamine, p-xylylene dimelamine.

4.4'-ditylene dimelamine, diethylene trimelamine, triethylene tetramelamine, tetraethylene pentamelamine, hexaethylene hebutamelamine, and the like. These melamine derivatives may be used alone or in combination of two or more. These melamine derivatives have good compatibility with polyamide and do not bleed out during dyeing or use of molded articles.

What is the composition ratio of polyamide and melamine derivative?

100 parts by weight of polyamide, 0.01 parts by weight of melamine derivative
It is preferably at least 5 parts by weight, and particularly preferably from 0.1 parts by weight to 0.1 parts by weight. If the proportion of the melamine derivative is too small, it will not be possible to impart sufficient dyeability to the polyamide, and if the proportion of the melamine derivative is too large, the physical properties of the resulting polyamide molded article will deteriorate.

In the present invention, the polyamide molded article can be manufactured by a known method. For example, polyamide and a melamine derivative are mixed by triblending or melt mixing, and then manufactured by a known molding method such as extrusion molding or injection molding.

The polyamide molded article of the present invention can also contain known additives such as antioxidants, lubricants, and inorganic fillers.

The acid dyes used in the present invention are 7 usually ordinary acid dyes,
Metal complex dyes and acidic mordant dyes can be brushed.

Dyeing with acid dyes is carried out in a conventional manner. For example, at 40-45°C, add 0.1% to 1.5% by weight of acid such as ammonium acid or acetic acid or formic acid.
Soak the molded product in an aqueous solution of 0.1 to 1% by weight of acid dye.
In addition, it takes 30 to 60 minutes.

This can be carried out by raising the temperature to 80 to 100°C and holding it for 60 to 60 minutes. After dyeing, wash and dry according to conventional methods.

Next, Examples and Comparative Examples will be shown. Note that "parts" in Examples and Comparative Examples mean "parts by weight."

Examples 1 to 4 Nylon 6 with a number average molecular weight of 13,000 (Ube Industries ■
1013B) were blended with 2 parts of the melamine derivative having a particle size of 1 to 20 μm listed in Table 1 to obtain pellets using an extruder. This pellet was injection molded into a molded test piece (55 x 19 x 3.
2m) was produced. 1000 parts of water was added per 33 parts of this molded test piece, and 7 parts of acetic acid (calculated in 100 parts) was added at 40 to 45°C. 10 minutes later + Am1nyl Blue
e E-2GL (Suminol Levelng)
Add 1 part of Blue AGG + Sumitomo Chemical ■, 40~
The temperature was raised to 85-100°C over 60 minutes, and dyeing was continued at that temperature for 1 hour.

Thereafter, the dyed test piece was washed in an overflow tank and dried in a conventional manner. The staining condition was visually evaluated.

Comparative Example 1 Example 1 was repeated except that the melamine derivative was not blended.

The results of the above Examples and Comparative Examples are shown in Table 1.

Patent applicant Ube Industries Co., Ltd.

Claims (1)

[Claims] Polyamide. A molded article composed of a melamine derivative represented by the formula (wherein R1 represents a hydrocarbon residue having 1 to 15 carbon atoms, and n is an integer of 0 to 5) is dyed with an acid dye. Characteristic dyeing method for polyamide molded products.