JPH04308217A - Liquid coloring agnet for molding acrylic resin - Google Patents

Abstract

PURPOSE:To provide the subject liquid coloring agent having an excellent coloring property on the coloration of a spinning solution for acrylic fibers without affecting the spinnability of the solution and without causing the aggregation of a pigment during storage. CONSTITUTION:A liquid coloring agent for a molding acrylic resin comprises 100 pts.wt. of a glycerol fatty acid ester and 0.5-150 pts.wt. of a pigment.

Description

[Detailed description of the invention]

0001

FIELD OF THE INVENTION This invention relates to a liquid colorant for molded acrylic resins. More specifically, the present invention relates to a liquid coloring agent for coloring acrylic fibers spun from a dimethylcarbamyl solution of an acrylic resin.

0002

[Prior art] Acrylic fibers have excellent dyeing clarity, light resistance,
In terms of bulkiness, it has superior properties not found in polyamide and polyester fibers, which are general-purpose clothing fibers, so it is widely used for clothing and interior decoration such as curtains and mats. However, in applications such as curtains and parasols that require light resistance, those colored using basic dyes, disperse dyes, and acid dyes have the disadvantage of poor light resistance. In order to improve the above-mentioned drawbacks, a method is known in which a pigment solution containing an acrylonitrile polymer or a surface-treated pigment is dispersed in a solvent, filtered, and then added to the dope (for example, JP-A-61 -6701
Publication No. 4). However, although pigments added to the spinning stock solution can be spun without coarse particles immediately after dispersion, depending on the type of pigment, they aggregate and settle within a few hours or days, and the aggregates clog the filter of the spinning nozzle, causing pressure This causes problems during spinning, such as the inability to spin and yarn breakage.

In order to improve pigment dispersion stability in acrylonitrile polymer solutions and solvents, ball mills, sand mills,
Attempts have been made to use media dispersion methods such as attritor, mechanical dispersion methods such as three-roll dispersion, and methods using additives such as activators, pigment surface treatment agents, and liquid resins, but the above drawbacks have not been resolved.

OBJECTS OF THE INVENTION The present invention provides a liquid coloring agent that has excellent coloring properties when coloring acrylic fibers with a stock solution and does not adversely affect spinnability. The present invention also provides a liquid colorant that is free from pigment agglomeration during storage.

0004

[Means for Solving the Problems] That is, the present invention provides 100 parts by weight of glycerin fatty acid ester and 0.5 to 1 part of pigment.
50 parts by weight of a liquid colorant for molded acrylic resin.

Examples of the glycerin fatty acid ester which is the liquid dispersion medium of the present invention include undecyl acid, lauric acid, tridecylic acid, mystylic acid, pentadecyl acid, palmitic acid, stearic acid, oleic acid, etc. Examples include mono-, di- or triesters of unsaturated fatty acids.

Pigments of the present invention include, for example, inorganic pigments such as titanium oxide white, carbon black, and transparent red iron oxide, and organic pigments such as azo, condensed azo, perylene, anthraquinone, isoindolinone, and phthalocyanine. , oil-soluble dyes such as perinone-based, anthraquinone-based, and quinophthalone-based dyes, and disperse dyes. Further, extender pigments such as barium sulfate, silica, talc, kaolin, and clay can also be used. In addition to the above pigments, dyes may be used in combination.

[0007] The liquid colorant of the present invention contains 0.5 to 150 parts by weight of the pigment per 100 parts by weight of the liquid dispersion medium, and if the amount of pigment exceeds 150 parts by weight, the viscosity of the liquid colorant increases. As a result, the supply performance by the quantitative feeder deteriorates, which is not preferable. In order to obtain the liquid colorant of the present invention, a predetermined amount of pigment and a liquid dispersion medium are blended and mixed using a mixer such as a homo mixer or a disper mill, and then kneaded using a general kneader such as a 3-roll or sand mill. to disperse the pigment. The viscosity of the obtained liquid colorant is preferably 10 to 300 poise at 25°C (BM type rotational viscosity, rotor No. 4, 20 rpm). The liquid colorant of the present invention can be used for acrylic fibers spun from a dimethylcarbamyl solution of an acrylic resin. The amount of liquid colorant added is 0.00 parts per 100 parts of solid content of the acrylic resin.
1 to 15 parts by weight is preferred. Examples will be explained below. All parts and percentages in the examples are based on weight.

[0008]

[Example 1] 25 parts of Leonol Green Y-102 (manufactured by Toyo Ink Co., Ltd.) and 75 parts of Excel 300 (oleic acid monoglyceride, manufactured by Kao Corporation) were mixed in a disper mill.
After stirring, the mixture was kneaded by two passes using a three-roll roll (rotation speed: 350 rpm) to obtain a liquid colorant having a temperature of 92 poise/25°C. Acrylic nitrile polymer solution (solid content 20%, DM
1.6 parts of this liquid colorant was dissolved in 100 parts of F (80% solvent) using a volumetric quantitative feeder, and stretched in two stages using a wet spinning machine to obtain acrylic fibers of 1.5 denier. The results of the short fibers obtained are shown in Table 1, and they were fiber yarns with good level dyeing properties, vividness, and coloring properties, and could be used satisfactorily for clothing and interior decoration. In the table, colorimetric value L*
, a*, b* are "KUROBO Auc" manufactured by Kurashiki Boseki Co., Ltd.
CIE1970,
Measurement was carried out under the conditions of D light source and 1 g of fiber. Level dyeability, spinnability and stretchability were evaluated on a four-level scale (◎: extremely good, ○: good, △: fair, ×: poor).

[0009]

[Example 2] Using 30 parts of Oriental Red FB New (manufactured by Toyo Ink Co., Ltd.) and 70 parts of Rheodol MO-60 (oleic acid monoglyceride, manufactured by Kao Corporation), the same procedure as in Example 1 was carried out to achieve a viscosity of 65 poise/25°C. A liquid colorant was obtained. Acrylic nitrile polymer solution (solid content 20
%, DMF solvent 80%) in 100 parts of this liquid colorant.
．． 0 part was dissolved in a volumetric quantitative feeder and stretched in two stages in a wet spinning machine to obtain 1.5 denier acrylic fiber. Table 1 shows the results of the short fibers obtained.

0010

[Example 3] 20 parts of Mitsubishi Carbon MA-100 (manufactured by Mitsubishi Kasei Corporation) and 80 parts of Excel 300 (oleic trimonoglyceride, manufactured by Kao Corporation) were prepared in the same manner as in Example 1 to form a liquid with a viscosity of 123 boids/25°C. A coloring agent was obtained. Acrylic nitrile polymer solution (solid content 20%, DMF solvent 80%
5 parts of this liquid colorant were dissolved in 95 parts of ) using a volumetric metering feeder, and drawn in two stages using a wet spinning machine to obtain acrylic fibers of 1.5 denier. Table 1 shows the results of the short fibers obtained.

[0011]

[Comparative Example 1] D containing 5% acrylonitrile polymer
Mitsubishi Carbon MA-100 10 in 90 parts of MF solution
After stirring in a dissolver for 10 minutes, the mixture was passed through a 15-liter horizontal sand mill three times to obtain a liquid colorant with coarse particles of 25 μm or less and a viscosity of 2.8 poise/25° C. Immediately after filtering this liquid colorant with a 5μ cartridge filter, 10 parts of this liquid colorant was added and dissolved in 100 parts of the acrylonitrile solution used in Example 1 using a quantitative feeder, and the same procedure as in Example 1 was carried out. This was spun to obtain 1.5 denier acrylic fiber. Table 1 shows the results of the short fibers obtained.

0012

[Comparative Example 2] The colored liquid after filtration obtained in Comparative Example 1 was left at room temperature for one day and night, and an attempt was made to spin it under the same conditions as Comparative Example 1. The nozzle pressure increased and spinning became impossible. After thoroughly stirring this liquid colorant with a dissolver, spinning was attempted again, but the result was the same.

Table 1 Pigment content L*
a* b* Level dyeing spinnability
Stretchability Example 1 0.40 75.
20 -41.09 6.91 ◎
◎ ○Example 2 0.90
76.81 48.61 2.88
◎ ◎ ◎Example 3
1.0 15.76 0.05
-0.22 ○ ◎
◎Comparative example 1 1.0 16.88
-0.09 -0.48 ◎
○ △Comparative example 2 1.0
── ── ── ○
× ×

[0014]

[Effects of the Invention] The liquid colorant for molded acrylic resin of the present invention uses a liquid dispersion medium with excellent pigment dispersibility, so it has excellent pigment dispersibility and dispersion stability. Therefore, it can be used as a coloring agent for base material, especially added to a dimethylcarbamyl-based solution of an acrylic resin, and a resin molded article with excellent coloring power can be obtained. Furthermore, when used as a coloring agent for acrylic fibers, it is possible to produce acrylic fibers with excellent appearance without adversely affecting spinnability, drawability, etc.

Claims (1)

[Claims] 1. A liquid coloring agent for molded acrylic resin, comprising 100 parts by weight of a glycerin fatty acid ester and 0.5 to 150 parts by weight of a pigment.