JPS63196719A - Fluorescent polyamide fiber - Google Patents

Abstract

PURPOSE:To provide the titled fiber outstanding in fluorescent nature and fiber formability, consisting of a skin-core type conjugate fiber with respective specific fluorescent agent-contg. polyamide as the skin component and titanium dioxide- contg. polyamide as the core component. CONSTITUTION:Using a skin-core type conjugate spinning machine, skin-core type conjugate fiber with a polyamide contg. 1-20wt.% of fluorescent agent (e.g., calcium sulfide-bismuth) as the skin component and a second polyamide contg. 2wt.% of titanium dioxide as the core component (pref., said skin component account for >=40% of the fiber sectional area) is spun followed by drawing, thus obtaining the objective fiber. The polyamide as the skin component is pref. nylon 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fluorescent polyamide fiber with excellent fluorescent performance.

(Prior art) Fibers containing fluorescent agents that emit long-wavelength light when irradiated with visible light, ultraviolet rays, and radiation are attracting attention as special fibers used for decoration, fashion clothing, night signs, etc. Several proposals have been made regarding such fibers and their manufacturing methods.

For example, JP-A-49-91579-G discloses a thermoplastic resin monofilament containing a type optical agent, and JP-A-60-81315 discloses a component containing a fluorescent agent and a fluorescent agent. A fluorescent conjugate fiber comprising a component that does not contain .

(Problems to be Solved by the Invention) Conventional fluorescent fibers as described above have a problem of insufficient fluorescence performance because they do not have a light control function inside the fibers.

The present invention aims to provide a fluorescent fiber with excellent fluorescent performance.

(Means for Solving the Problems) In order to achieve the above object, the present inventors, as a result of intensive studies, have determined that the polymer forming the fiber is polyamide, the sheath component contains a fluorescent agent, and the core component It was discovered that it is effective to make a sheath-core type fiber containing titanium dioxide, and the present invention was achieved.

In other words, the present invention provides a fluorescent polyamide fiber comprising a sheath-core type composite fiber in which the sheath component is polyamide containing 1 to 20% by weight of a fluorescent agent and the core component is polyamide containing 2% by weight or more of titanium dioxide. That is.

Examples of the polyamide in the present invention include nylon 6, nylon 66, nylon 46. Aliphatic polyamides such as nylon 610 and polyamides mainly composed of these are preferably used, but polyamides partially containing aromatic groups can also be used.

What is the polyamide sheath component and the polyamide core component?

It can be the same or different.

The fluorescent agent contained in the sheath component is preferably one that has an afterglow for 10 minutes or more after blocking the irradiation light, and specific examples include calcium sulfide-bismuth, zinc sulfide-copper,
Examples include zinc sulfide-cadmium copper.

Note that if the particle size of the fluorescent agent is less than 5 μm, the fluorescence storage ability will not be sufficient, so it is desirable that the particle size be somewhat larger.

It depends on the thickness and fineness of the fiber, etc., but it is usually up to 30μ.

The blending amount of the fluorescent agent must be 1 to 20% of the weight of the sheath component, and if it is less than 1%, sufficient fluorescent performance will not be exhibited.
If it exceeds 20%, the spinning properties will deteriorate.

In addition, the titanium dioxide contained in the core component may be one that is used as a matting agent for fibers, and is 2 times the weight of the core component.
% or more is necessary. If the content of titanium dioxide is less than 2%, the fluorescence reflection ability or blocking ability of the core component is low, and the fluorescence emitted from the sheath portion may be dispersed to areas other than the fiber surface.

It may be absorbed by the core component and cannot exhibit good fluorescent performance. However, if the content of titanium dioxide is too high, the thread-spinning properties will be impaired, so it is necessary to keep the content within a range that provides good thread-spinning properties.

The ratio of the sheath component to the core component of the composite fiber is preferably such that the sheath component accounts for 40% or more of the cross-sectional area of the fiber from the viewpoint of fluorescence performance.

The fluorescent composite fiber of the present invention can be produced by spinning a polyamide containing a fluorescent agent and a polyamide containing titanium dioxide using a conventional sheath-core type composite spinning device and drawing the fiber. .

The method of incorporating the fluorescent agent and titanium dioxide into the polyamide is not particularly limited, but it is preferable to add the fluorescent agent to the polyamide chips during spinning and the titanium dioxide during polymerization of the polyamide (of course, the master chip method is preferred). Note that it is preferable to make the relative viscosity of the polyamide of the sheath component slightly lower than that of the core component, since this improves the spinning properties.

The fluorescent polyamide fiber of the present invention can be used alone or in combination with other fibers! Processed into AM products, robes, sheets, etc.
Used for applications requiring fluorescence.

(Example) Next, the present invention will be specifically explained with reference to Examples.

Example Relative viscosity (96% sulfuric acid as solvent, concentration 1 g, /j.

(Measured at a temperature of 25°C) 2.55 nylon 6 chips added with zinc sulfide-copper (ZnS-Cu) with an average particle size of 15μ was used as the sheath component, and titanium dioxide (TiO□) was added during polyamide polymerization. A sheath-core type composite spinneret with nylon 6 chips with a relative viscosity of 2.60 as the core component and 35 spinning holes with a hole diameter of 0.5 am was used, and the spinning temperature was 2.
The fibers were melt-spun at 65° C. and drawn 2.5 times to obtain composite fibers with a sheath/core area ratio of 1/1 and 420 d/35 f.

The obtained fibers were made into a tubular knitted fabric, 20g of this knitted fabric was irradiated with light from a white fluorescent lamp for 30 minutes, the illumination light was immediately shut off, and the afterglow time of the fluorescence was measured. (phosphorescence) was evaluated.

O: Afterglow time 30 minutes or more △: Afterglow time 15 to 30 minutes ×: Afterglow time 15 minutes or less Contains Zn5-Cu and Tie in composite fiber! (% by weight relative to each component), spinning properties, and fluorescence are shown in Table 1.

Table 1 (Effects of the Invention) According to the present invention, a fluorescent polyamide fiber is provided which has excellent fluorescence (phosphorescence) and can be manufactured with good spinability.

Claims (1)

[Claims] (1) A fluorescent polyamide fiber consisting of a sheath-core composite fiber whose sheath component is polyamide containing 1 to 20% by weight of a fluorescent agent and whose core component is polyamide containing 2% by weight or more of titanium dioxide.