JPS5940924B2 - Colored spinning dope for cellulose-based artificial fibers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel and useful colored spinning dope for cellulose-based artificial fibers, and more particularly, the present invention relates to a colored spinning dope for cellulosic artificial fibers, and more particularly, diglycerin and/or triglycerin are added to the spinning dope. The present invention relates to a colored spinning dope for cellulose-based artificial fibers in which the easy dispersibility of a colorant composition into the spinning dope is significantly improved by containing the above-mentioned.

The aqueous stock solution colorant for cellulose-based artificial fibers, which has been used in the past and consists of pigments, dispersants, protective colloids, water, etc., is made by spinning a copper ammonium rayon spinning solution or a viscose spinning solution into spun dyed yarn. The problem was that it caused trouble when doing so.

For example, when mixing aqueous pigment paste with the above stock solution,
An example of this is a situation where pigment particles undergo "colloid shock" and the dispersibility of the pigment is impaired.

This phenomenon is thought to be caused by the pigment particles becoming coarse due to the above-mentioned "colloid shock", which impairs the dispersibility of the pigment.

For this purpose, it is necessary to improve the dispersibility of the colorant composition in the spinning dope and to stabilize the dispersion.

The degree of easy dispersibility varies depending on the condition of the cellulose-based artificial fiber used, the concentration or pH of the colorant composition, such as the aqueous pigment paste, or the degree of mixing of this paste into the spinning solution, but is not uniform. In the case of a colorant composition that has good dispersibility, the stirring time for mixing can be shortened, and the stirring speed does not need to be so high, increasing productivity, and making it easier for industrial production. It is something that produces benefits.

The present inventors focused on the existence of the defects observed in the conventional colored spinning dope for cellulose-based artificial fibers as described above, and improved the dispersibility of the colorant composition in the spinning dope by eliminating these defects. As a result of extensive research to develop a colored spinning dope, we found that adding a mixture of diglycerin and/or triglycerin to a colorant composition composed of pigments, dispersants, etc. to the above spinning dope will result in coloring. The dispersibility of the agent composition in the spinning dope is significantly improved, and as a result, the colored fibers obtained by spinning using the spinning dope with stabilized dispersion have excellent coloring uniformity. Moreover, the present invention was completed by discovering that the hue density was improved.

That is, the present invention provides a colored spinning stock solution for cellulose-based artificial fibers, which is prepared by adding a colorant composition composed of pigments, dispersants, etc., which further contains diglycerin and/or triglycerin in the colorant composition. The present invention provides a colored spinning dope for cellulose-based artificial fibers, which is characterized by the following.

Further, the amount of diglycerin and/or triglycerin used is generally 10 to 200 parts, preferably 50 to 150 parts, based on the weight of the pigment, but the type of pigment constituting the colorant composition or the type of fiber used Therefore, even if it deviates from the above-mentioned range, it is included in the present invention as long as it follows the above-mentioned spirit.

The above-mentioned diglycerin and/or triglycerin can be added at the stage of finely dispersing the pigment to prepare a coloring composition, or after a colorant composition containing already finely dispersed pigment is obtained. In either case, the conventional disadvantage of colloidal shock of pigment particles is prevented, the easy dispersibility of the colorant composition in the spinning dope is improved, and this dispersion is stabilized. The effects of the invention can be effectively achieved.

Furthermore, the system to which diglycerin and/or triglycerin is added is effective for both aqueous and non-aqueous systems, and the above-mentioned effects brought about by the addition of diglycerin and/or triglycerin It is by no means limited to pigments, but is also effective for various additives having a dispersed system, such as calcium carbonate, which is generally known as a filler or blowing agent.

In this sense, the "colorant composition" of the present invention is not limited to an aqueous pigment paste composed of a pigment, a dispersant, a protective colloid, water, etc., but may also be a non-aqueous pigment paste that does not contain water. , which can be interpreted in an extremely broad sense.

Next, the present invention will be explained in detail using examples.

Hereinafter, "parts J" and "r%J" mean "parts by weight" and "parts by weight" unless otherwise specified.

Example 1 A mixture of 20 parts of furnace-type carbon black, 6 parts of soda salt of β-naphthalene sulfonic acid/formalin condensate, 10 parts of Jigriya 9F, and 64 parts of water was finely dispersed with an attritor. 0.8 of the colorant composition
1 part was mixed with 100 parts of a viscose rayon spinning dope (α-cellulose content: 8 parts) and spun according to a conventional method.

As a result of this spinning, a black spun-dyed yarn with good gloss, good spinnability, and good uniformity was obtained.

Further, the same operation was repeated with different types of pigments as shown in Table 1 below, and good results were obtained no matter which pigment was used.

Furthermore, in order to evaluate the easy dispersibility of each colorant composition,
The dispersion value, that is, the number of coarse particles, of the colored rayon stock solution was measured.

The results are summarized in Table 1.

Here, the above "coarse particle number" is after spreading the colored viscose rayon stock solution with a 3 mil film applicator,
This is a number obtained by measuring the number of coarse particles (number of particles with a particle size of 10 microns or more) per field of view under an optical microscope at 100x magnification, and the smaller the number, the less the filter is clogged. There is little yarn breakage during spinning, and in addition, the fiber strength and elongation are good, and the color is also good and glossy.

For comparison, when we repeated the same operation using a colorant composition completely lacking the use of diglycerin, it was found that each color paste was not uniformly dispersed in the viscose rayon stock solution, and the threads during spinning were not uniformly dispersed. There were many breaks, and therefore this product could not be used as a spinning dope for each color.

Example 2 10 parts of β-type phthalocyanine blue, 10 parts of soda salt of β-naphthalene sulfonic acid/formalin condensate, (CH2
A colorant composition was obtained by finely dispersing a mixture of 10 parts of 0HCHOHCH20)2-1H and 70 parts of water using a vibration mill.

A portion of this colorant was then added to copper ammonia rayon (α
When the mixture was added to 100 parts of a spinning solution containing 10% cellulose and then spun using a conventional method, a bright blue spun-dyed yarn with good spinnability was obtained.

Claims (1)

[Claims] 1. A colored spinning stock solution for cellulose-based artificial fibers containing a colorant composition composed of a pigment, a dispersant, etc. is characterized by further containing diglycerin and/or triglycerin in the colorant composition. Colored spinning dope for cellulose-based artificial fibers.