JPH02210020A - Light-resistant polyester fiber - 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 (Field of Industrial Application) The present invention relates to a polyester fiber with excellent light resistance.

(Prior Art) Polyester fibers have excellent physical properties and are widely used, and their light resistance is by no means inferior.

However, when a high degree of light resistance is required, it is necessary to use antioxidants, ultraviolet absorbers, etc., and there are drawbacks such as shedding due to processing or washing, and the performance is never sufficient. The current situation is that this is not the case.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned problems and furthermore provides a polyester fiber that has significantly better light resistance.

(Means for solving the problem) That is, oxidized Seriwam fine particles with an average particle size of 2.0μ or less,
0.05% by weight (hereinafter abbreviated as wt%) or more, i, o
It is a fiber made of polyester resin containing less than wts.

Cerium oxide has excellent ultraviolet absorbing ability, has no sublimation property, and has low catalytic activity against polyester, making it an excellent light resistance improver.

Perhaps because it is a rare earth and the amount of production is small, it has never been used in this field until now.

The present inventors focused on this cerium oxide, and as a result of intensive research, they arrived at the present invention.

The cerium oxide used in the present invention has an average particle size of 2.0μ
It is necessary that the particles be as follows. If this value is exceeded, major industrial problems such as spinning and stretching will occur. In this sense, the average particle diameter Q is preferably 8 μm or less, more preferably 0.5 μm or less.

The amount of cerium oxide used in the present invention is as described above (
It is 0.05Wt or more and 1,Qwt% or less.

If Q, Q 5 wt is less than 9b, the effect of improving light resistance will hardly be observed; If it is added in excess of Qft, the light resistance will deteriorate, perhaps due to its catalytic action. The most preferable addition amount is %0.2w
It is about t%.

The polyester used in the present invention is one in which 80 moles or more of its constituent units are ethylene terebutanate residues or butylene terephthalate residues, but sulfoinphthalic acid, inphthalic acid, or these are used as modifiers. A derivative, an ethylene oxide adduct of bisphenol, etc. may be copolymerized, or a polyalkylene glycol or the like may be kneaded. Of course, commonly used titanium oxide, cobalt compounds, etc. may be added.

Furthermore, the present inventors conducted intensive studies on polybutylene terephthalate (hereinafter abbreviated as PBT) polyester, which has relatively poor light resistance, and found that a titanium-based catalyst, which is a polymerization catalyst for PBT-based polyester, was replaced with a phosphorous acid-based compound. It was discovered that the light resistance was further improved by adding cerium oxide to the PBT-based polyester which had been deactivated by the method and had improved light resistance.

This is thought to be due to the addition of cerium oxide, which has a high ultraviolet absorption ability, in addition to deactivating titanium, which has high photoactivity.

The cerium oxide used in the present invention can be added at any time from the start of polyester synthesis to fiberization, but considering the process efficiency, it is preferable to add cerium oxide at any time from the start of polyester synthesis to fiberization, but from the viewpoint of dispersing the particles to a high degree, it is preferable to add cerium oxide. It is preferable to pre-disperse them in the synthetic raw materials using a suitable dispersion machine such as a vibration mill or a planetary mill. It is also possible to mix the resin with powder using a twin-screw extruder, and the master chip method can also be applied. A dispersion (sol) of cerium oxide may also be used, but in this case it is preferable to use as little dispersion aid as possible.

When dyeing the polyester-based am of the present invention, it is preferable to use an ultraviolet absorber, especially a benzotriazole-based one.

(Examples and Comparative Examples) The present invention will be explained in more detail below using Examples and Comparative Examples.

Examples 1 to 4, Comparative Examples 1 to 3 Cerium oxide particles (average particle size 1.2μ) were added to ethylene glycol (hereinafter abbreviated as EG) to a concentration of 30 wt%, and heated in a vibrating mill for 1 hour. It was crushed for a period of time to form a dispersed slurry. Using this, terephthalic acid, EC, and antimony trioxide (350 ppm), the direct method (esterification method)
The amount of cerium oxide added is 0.0.03.0.0
5.0.2.0.5.1.0.1.5wt each addition of P
An ET resin was synthesized. This resin was spun using a uniaxial spinning machine and drawn into a drawn yarn of 75 denier and 36 filaments. This drawn yarn was made into a tubular knitted fabric and heated to 130°C according to a conventional method.
Stained. The dye is Eastman Polyyeste.
2% of Blue 3R-LSW was used.

This sample was subjected to carbon fade irradiation at 83°C for 200 hours, and a judgment was made using gray scale. The results are shown in Table IK. 94w compared to without addition of cerium oxide
It can be seen that the maximum 1,5N light resistance is improved mainly when t% is added. However, it is clear that if the amount is too much, the effect will not be recognized.

Table 1 Comparative Example 4 A resin was prepared using cerium oxide with an average particle size of 3.0μ in the same manner as in Example 3, and an attempt was made to spin it, but the spinning filter pressure rose too quickly and single fibers did not break, resulting in yarn breakage. However, the process performance was poor. However, when a small amount of the obtained drawn yarn was dyed in the same manner as in Example 3 and its light resistance was measured and evaluated, it was found to be good at grade 3-4.

Examples 5 to 9, Comparative Examples 5 to 7 Cerium oxide having an average particle size of 1.2 μm was dispersed in 1,4-butanediol to a concentration of 25 wt % jc, and crushed in a vibration mill for 1 hour. A polybutylene terephthalate tree shown in Table 2 was synthesized from this dispersion, 1,4-butanediol, and dimethyl terephthalate using tetra-1so-propyl titanate (Tt=so ppm) as a catalyst. In addition, phosphorous acid and a phosphorous acid-based antioxidant were added after completion of polymerization to deactivate the polymerization catalyst and synthesized.

These resins were spun and stretched in the same manner as in Examples 1 to 4, and their light resistance was evaluated. The results are shown in Table-2.

As a result, the addition of cerium oxide significantly improves the light resistance of ordinary polybutylene terephthalate fibers.
It is clear from comparison with Comparative Example 1) that the effect is further increased by adding the phosphorous acid compound.

Table 2 Note 1) Amount of P added: Addition of phosphorous acid or phosphorous antioxidant (wt%) Note: Phosphorous compound used: Phosphorous acid Patent applicant RiRa Co., Ltd. Patent attorney Important solid

Claims (1)

[Scope of Claims] 1) A fiber made of polyester in which 80 mol% or more of the structural units are ethylene terephthalate residues or butylene terephthalate residues, and has an average particle size of 2.0 μm.
0.05% by weight or more of the following cerium oxide fine particles: 1.0% by weight
Polyester fiber with excellent light resistance characterized by containing less than % by weight. 2) The polyester fiber with excellent light resistance according to claim 1, wherein the butylene terephthalate polyester is one in which the titanium polymerization catalyst has been deactivated with a phosphorous acid compound.