JPS6241310A - Rayon fiber having excellent light fastness - Google Patents

Abstract

PURPOSE:To obtain the titled fiber having remarkably improved light fastness and excellent thermal discoloration resistance, by supporting a fluorescent dye on fine particles of a benzoguanamine resin and adding the particles to viscose before spinning. CONSTITUTION:Fine particles of a benzoguanamine resin supporting a fluorescent dye are produced e.g. by coloring uncured benzoguanamine resin with a fluorescent dye, curing the aqueous emulsion of the colored resin particles with a curing catalyst and separating and drying the product. The particles having a particle diameter of preferably 0.4mu are dispersed in water in the presence of an anionic surfactant and added to viscose. The objective fiber can be produced by spinning the viscose added with the particles.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rayon fiber with high whiteness, light resistance, and robustness that can be used for general purposes such as 1-inch rear clothing, bedding, and industrial materials.

(Prior art) Conventionally, in order to produce rayon fibers with excellent whiteness, ordinary rayon fibers were dyed directly with fluorescent dyes, or dyed with fluorescent dyes such as direct fluorescent dyes and dispersed fluorescent dyes. Dyes, fluorescent pigments, etc. were added to viscose for rayon spinning, and if necessary, a small amount of night-type thren dye was added in order to further increase the effect, and it was manufactured using a mixed spinning method.

(Problems to be solved by the present invention) However, rayon dyed with these fluorescent dyes and rayon manufactured by spinning a complete mixture of fluorescent dyes and fluorescent pigments have poor heat resistance and light resistance. However, there was a drawback that the color change was significant during use.

Particularly in recent years, consumers have begun to place importance on light resistance, and fibers with high whiteness and robust light resistance are strongly desired.

(Another Means to Solve the Problems) The inventors of the present invention have conducted intensive research to solve the above-mentioned drawbacks, and as a result, they have found that they are heat resistant and alkali resistant.

The present inventors have discovered that such problems can be improved by adding to viscose a fluorescent dye that has excellent acid resistance, uniform spherical fine particles, and is made of a lightweight benzoguanamine resin paste, thereby completing the present invention.

That is, the present invention provides a viscose material obtained by dispersing and adding fine powder of benzoguanamine resin colored with a fluorescent dye to viscose in water when manufacturing rayon by wet spinning viscose in a pseudo-solid bath. This invention relates to rayon fibers with high whiteness and excellent light fastness obtained by spinning coarse fibers.

The method for producing rayon of the present invention will be explained below.

The viscose for rayon used in the present invention has a composition immediately before spinning that has been filtered in advance and has cellulose and alkali concentrations of 8.40 to 9.40%, respectively.

5.50 to 6.50% is used.

Father, fine powder of benzoguanamine resin colored with fluorescent dye is 1.For example, uncured benzoguanamine resin is colored with fluorescent dye to form an aqueous emulsion, or an uncolored emulsion is made water-soluble. It is obtained by curing the fluorescent dye in the presence of a curing catalyst, followed by separation and drying. The size of the fine powder used in the present invention is only 0.
It is preferably 4μ or less.

Further, the negative value of the colored benzoguanamine resin fine powder added to viscose is appropriately determined depending on the coloring density of this fine powder and the degree of coloring of the intended rayon, but it is generally 0. It is about 1 to 2 yen.

In the present invention, such colored benzoguanamine-based resin fine powder is used, for example, as a higher alcohol sodium sulfate salt, a higher fatty acid sodium salt such as sodium oleate, dobutylbenzenesulfonate sodium, or dialkyl sulfosuccinate sodium salt.

It is added to viscose as an aqueous dispersion using an anionic surfactant such as naphthalene sulfonate formalin condensate, and the amount of anionic surfactant used at this time is 1. Colored benzoguanamine-based fat It is preferably 0.0z to 0.5%, especially 0.05 to 0% based on the weight of
．． 1% is even more preferred.

If it is less than 0.02%, a sufficient effect cannot be obtained, and even if it is added in an amount of 0.5% or more, not only the commensurate effect cannot be obtained, but also a lot of bubbles are generated in the mixed viscose.

Moreover, it is not preferable because it accumulates in the coagulation bath and causes disadvantages such as impairing coagulation properties.

The mixed viscose thus obtained can be further subjected to defoaming treatment to remove air bubbles mixed in during the stirring process.In addition, the coagulation bath used for wet spinning may be 1, for example, HtSO.
498-1151'L, Zn5O,l B"2-
014°Na,, SOt 330~860 VL (D
M composition) a same bath'e can be used.

The colored benzoguanamine resin-mixed viscose obtained in the above manner has good filterability, and even in the wet spinning process, the viscose is well separated from the nozzle surface in the coagulation bath. A fluorescent, highly white rayon with almost no lumps such as agglutinants and good light fastness can be obtained.

The obtained high white rouyon is not limited to this during the ordinary scouring process.

Example 1 Filtration and defoaming cellulose 8.4%, alkali 6.0
Fine benzoguanamine resin powder (part name BPO color SC8,
A 10% aqueous dispersion of fluorescently colored benzoguanamine resin in which Nippon Shokubai Kagaku F was dispersed using 0.08% sodium lauryl sulfate based on fine powder was coagulated in a viscose bath composition HtS.
O41129/L, Zn5o.

13,5 f/'L, Na2SO43B OS'/
T-, wet spinning was performed in a spinning bath at a temperature of 45°C. The spinning condition was good and four fibers were obtained. This fiber was then refined under normal conditions to obtain a highly white rayon.

The light fastness and heat discoloration resistance of the obtained fibers were measured,
The results are shown in Table 1. Comparative Example 1 A commercially available fluorescent dye (trade name Kayaphor 8N conc.
Fluorescently colored viscose rayon was prepared in the same manner as in Example 1, except that 1% of viscose was used (manufactured by Nippon Kagaku Kogyo Co., Ltd.), and a fluorescent dye was added in the same manner as in Example 1. Mars Rayon was manufactured. The light fastness and heat discoloration resistance of the obtained rayon fiber were measured, and the results are shown in Table 1.

Table 1 *The samples were irradiated for 40 hours with a carbon fade-o-meter along with a blue scale in accordance with IJIS L-0842, and expressed as a grade of the blue scale corresponding to the f chromaticity of the sample.

East 2 Leave the discolored dust under the temperature conditions shown in Table 1.
IS L-0804 also provides a gray scale rating.

As described above, it is clear that the fluorescent rayon of the present invention to which benzoguanamine-based resin powder colored with a fluorescent dye is added has significantly better light resistance than that using conventional commercially available fluorescent dyes. .

(Functions and Effects) As described above, the viscose rayon to which fine powder of benzoguanamine resin colored with a fluorescent dye is added has significantly improved light fastness compared to the conventional viscose rayon to which a fluorescent dye is added. It also has excellent heat resistance and discoloration.

Claims (1)

[Claims] A viscose rayon fiber with excellent light resistance that contains a fluorescent dye supported on benzoguanamine resin particles.