JPH01221513A - White antistatic synthetic fiber - Google Patents

Abstract

PURPOSE:To obtain the subject fiber, requiring no finishing by dyeing, scarcely receiving soil redeposition by washing and consisting of a fiber-forming polymer containing a fluorescent whitening agent as a sheath component and a specified structural composition composed of a polyalkylene oxides-containing block copolymer, etc., as a core component. CONSTITUTION:A fiber-forming polymer (A) mixed with a fluorescent whitening agent (D), a polyalkylene oxides component-containing block copolymer (B) containing polyalkylene oxides and another polymer (C) are respectively charged from introduction holes 11, 12 and 13 of a top cap 1. The component (B) is extruded as fine linear flows from plural discharge holes 14 into a flow of a component (C) in a passage 21 for composite flow, subsequently led to the top of a static blender 22, introduced through a passage 23 to an introduction hole 31 of a spinneret plate 3 and subjected to conjugate spinning together with the component (A) containing the component (D) to provide the aimed fiber consisting of the component (A) containing the component (D) as a sheath component and a composition composed of the composition (C) blended with the component (D) in the form of plural belts or a network shape continuing in the direction of fiber axis as a core component.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a white antistatic synthetic fiber that does not require dyeing with a fluorescent white dye and is less likely to be re-stained by washing.

(Prior Art) It is well known that the introduction of polyalkylene oxide compounds is effective in suppressing electrostatic damage in synthetic fiber products such as polyester and polyamide. In particular, a method of blending a block copolymer consisting of a polyalkylene oxide component and a polyester or polyamide component is said to be optimal for obtaining durable antistatic yarns.

However, 1. When introducing a block copolymer using the normal blending method, the polyalkylene oxide component tends to be bound in the fiber molecules, resulting in reduced mobility and the problem of static electricity problems occurring under low humidity conditions such as in winter. was there.

Furthermore, if the polyalkylene oxide component is introduced even to the surface of the fiber, it may be necessary to carry out alkali reduction treatment to obtain silk-like polyester fiber.

There were problems in that the polyalkylene oxide component was extracted, resulting in loss of antistatic properties and fibrillation of the fibers. In order to solve this problem, it is known to introduce a polyalkylene oxide component into the core component of the composite fiber. It has been proposed that the containing block copolymer is blended in the form of a continuous band or network in the fiber axis direction.

(Problems to be Solved by the Invention) White fabrics are usually dyed and finished with fluorescent white dye, but during the dyeing process, other stains from inside the dyeing machine may adhere to them, or dryers, heat setters, etc. Antistatic synthetic fibers, such as those mentioned above, are no exception to this problem.

Furthermore, fabrics made of antistatic synthetic fibers and dyed with fluorescent white dyes have a problem in that they are highly recontaminated by washing.

The present invention aims to provide a white antistatic synthetic fiber that does not require dyeing with a fluorescent white dye and is less likely to be recontaminated by washing.

(Means for Solving the Problem) As a result of various studies to solve this problem, the present inventors have found that it is possible to blend a fluorescent brightener only into the sheath component of the antistatic synthetic fiber as described above. They found that the method is effective and arrived at the present invention.

That is, 9 the present invention uses a fiber-forming polymer [A] as a sheath component, a composition of a polyalkylene oxide component-containing block copolymer (B) and another polymer [C] as a core component,
An antistatic composite fiber in which [B] is blended into [C] in the form of a plurality of substantially continuous bands or networks in the fiber axis direction, and a fluorescent whitening agent is included only in the sheath component. D]
The gist of the invention is a white antistatic synthetic fiber characterized by containing the following.

In the present invention, the fiber-forming polymer [A] is polyethylene terephthalate, polybutylene terephthalate, poly-p-ethyleneoxyben 7', poly-17-
1.4-cyclohexylene dimethylene terephthalate, polyethylene-2,6-naphthalate, etc., and polyesters containing these as main components, nylon 6, nylon 12.
Nylon 46. Typical polymers that can be melt-spun include nylon 66, nylon 610, etc., polyamides containing these as main components, polyethylene, polypropylene, etc., and polyolefins containing these as main components, but solution spinning or emulsion spinning is possible. It may also be a polymer.

Next, the block copolymer [B] in the present invention means a block copolymer containing a polyalkylene oxide component such as polyethylene oxide, polypropylene oxide, and ethylene oxide-propylene oxide copolymer.

Specifically, hydroxyl groups and carboxyl groups during the synthesis of polyester and/or polyamide.

Those obtained by adding a polyalkylene oxide compound having one or more (preferably two) ester- or amide-forming functional groups such as an alkoxycarbonyl group or an amino group are suitable.

Specific examples of components forming polyester and/or polyamide include adipic acid and sebacic acid.

Dicarboxylic acid components such as terephthalic acid, inphthalic acid, 5-sodium sulfoisophthalic acid, naphthalic acid, ethylene glycol, propylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol, 1,4-cyclohexane dimetatool, xylene Diol components such as lene glycol, oxyacid components such as ε-oxycaproic acid and p-β-hydroxyethoxybenzoic acid, lactones such as pivalolactone and caprolactone, ethylene diamine, tetramethylene diamine, hexamethylene diamine, phenylene diamine, xylylene diamine Diamine components such as amines, N,N'-bis(amino-n-propyl)piperazine, and bis(p-aminocyclohexyl)methane.

Examples include aminocarboxylic acid components such as aminocaproic acid and aminolauric acid, and lactam components such as caprolactam and laurinlactam.

The molecular weight of the polyalkylene oxide component is 4.
00~20,000. Preferably 800-10,000
The content in component (B) is 10 to 90% by weight.

Preferably it is 20 to 70% by weight.

Also, modified polyalkylene oxides such as bisphenol A can be used as polyalkylene oxides.

Compounds obtained by adding alkylene oxide to bisphenols such as bisphenol S are heat resistant.

5-alkaline metalsulfoisophthalic acid and N,N'-bis(amino/-n-
Using hydrophilic ingredients such as propyl piperazine,
It is particularly preferable to blend an organic or inorganic electrolyte or other ionic compound into the block copolymer since this has the advantage of increasing the antistatic activity of the block copolymer.

Further, as the dipolymer [C], a fiber-forming polymer similar to [A] is preferably used, but depending on the case, a polymer having poor fiber-forming property when used alone can also be used.

Note that it is preferable that the nine polymers [A], (B), and [C] be combined in a manner that has as much affinity (adhesion) as possible.

(If the affinity is poor, the process of stretching, false twisting, heat treatment, etc.
Separation between components is likely to occur due to frictional force, heat, etc. ) For example, a combination in which [A] and [C] are polyester and (B) is a block copolyether ester is preferred.

In addition, the fluorescent whitening agent [D] is a pyrene type.

Oxazole series, coumarin series, thiazole series, imidazole series, imidasilone series, pyrazole series.

Benzidine type, diaminocarbazole type, naphthalic acid type, diaminostilbendisulfonic acid type and the like can be mentioned, but oxazole type is particularly preferred as it is suitable for use in combination with titanium dioxide and has excellent heat resistance.

The amount of fluorescent brightener [D] added to the sheath component is 0.005~
1.0% by weight, preferably 0.01-0.3% by weight is suitable. If this amount is too small, the whitening effect will be insufficient, and if it is too large, the fibers will turn yellow, which is undesirable.

The fluorescent whitening agent [D] is added only to the sheath component.

If a fluorescent brightener is added to only the core component, the whitening effect will be poor, and if it is added to both components, the cost will be high and there will be no advantage.

Figures 1(a) to [C] show specific examples of the fibers of the present invention.

FIG. 3 is a diagram schematically showing a cross section thereof. [A] in which [D] is blended constitutes a sheath component, [B] forms a plurality of band shapes, and the component blended in [C] constitutes a core component;
This form is substantially continuous in the fiber axis direction.

In this type of fiber, it is appropriate that the number of bands is 3 or more, preferably 5 or more, but if the number is too large, it will become close to fine dispersion and the antistatic properties will deteriorate.

You should avoid increasing the number to an extremely high level.

Further, even when [B] is blended in [C] in a network-like composite fiber, the same effect as when [B] is blended in a plurality of strips can be obtained.

FIG. 2 is a cross-sectional view of an example of a spinneret apparatus for obtaining fibers having the configuration shown in FIG.

Components [A] + CD), (B'), and [C] are introduced from the introduction holes 11, 12, and 13 of the top cap 1, respectively. Component [C] spreads uniformly through the composite flow path 21 and is led to the top of the static mixer 22 provided in the intermediate plate 2. On the other hand, component [B] is discharged from the plurality of discharge holes 14 [C]
After forming a composite flow by forming a thin linear flow in the flow similar to the above, the composite flow is introduced into the top of the static mixer 22 through the composite flow channel 21. The mixed flow obtained in the static mixer 22 passes through the flow path 23 and is introduced into the introduction hole 31 of the first nozzle plate 3, and is subjected to composite spinning together with the components [A] + [D] introduced from the introduction hole 11. .

Further, in order to obtain fibers in which [B] is mixed in [C] in a network form, a coarse filter medium may be installed in the flow path 23 in the spinneret apparatus shown in FIG. 2, for example. Such a filter medium has a mesh size of 10 to 500 meshes.

Preferably, a wire mesh with 20 to 300 meshes is suitable; if the wire mesh is too fine, the CBE will be dispersed too finely and no network will be formed, reducing the antistatic effect.

The ratio of each component varies depending on the type of polymer used, but in general, the ratio of [B] and [C] is determined by weight, taking into account antistatic effect, spinning properties, yarn properties, stability during processing, etc. 5 in ratio
:95~40 :60. Preferably 10:90-50
: 50. The ratio of sheath component to core component is 90 by weight
: 10-20 : 80. Preferably 85:15
~25:75 is appropriate.

(Examples) Hereinafter, the present invention will be explained in more detail with reference to Examples.

In the examples, "parts" indicate parts by weight, and the performance evaluation of the m products was performed by the following method.

After pre-drying M Koju textile at 70℃±2℃ for 1 hour, 20℃×40
4C11lX left overnight in an atmosphere of %RH
For a sample with a size of 3 cm, the frictional charging voltage is determined using a rotary static tester according to the JIS L 1094 B method.

The Wataku fabric is placed under a 056 standard light source and judged by a sensory test in three stages (good, slightly poor, poor).

Recontamination level of the employee's soil 5g of sodium tripolyphosphate, 5g of sodium laurylbenzenesulfonate, and a synthetic pollution source made by mixing the oily pollution sources and dry pollution sources shown in Table 1 at a ratio of 3/1.0.
Dissolve 75g in distilled water 1j7.

Disperse to make contaminated liquid.

Table 1 4 fabric samples of 50 x 5c111, 200m of the above contaminated liquid
1 and 10 steel balls into a test bottle, 4
Process for 60 minutes in a round-o-meter at 0°C ± 2°C.

The steel ball, test bottle, and round-o-meter are the same as those used in the JIS L 0844 washing fastness test method.

After taking out the sample and rinsing it with running water, it was washed with 100n+1 water at 40°C for 10 minutes using a round-o-meter, and after taking out the sample and rinsing with running water twice, it was dried in a tumbler and washed with gray scale for contamination. Determine the degree of contamination.

There are 5 grades of judgment: 1st grade (high degree of recontamination, poor) to 5th grade (good, no recontamination).

Example 64 parts of oligomer (number average degree of polymerization) obtained by esterification reaction of terephthalic acid and ethylene glycol, ethylene oxide adduct of bisphenol A (average molecular weight 4)
．． 000), 3 parts of bisethylene glycol ester of 5-sodium sulfoisophthalic acid, and 0.02 part of antimony trioxide (used as a 2% solution in ethylene glycol) were charged into a reactor.

A block copolymer was obtained by polycondensation under the conditions of 0.1 torr, 270° C., and 4 hours.

Ordinary polyethylene terephthalate ([A] acid component mixed with 0.1% by weight of Eastman Kodak's East Bright OB-1 as a fluorescent brightener [D] (sheath component)), the above block copolymer ([ B] component) and ordinary polyethylene terephthalate ([C] component) were each melted at 270 to 285°C in an extruder.
The fibers were fed into the spinneret device shown in Figure 2 (5 static mixing elements) at a weight ratio of 50 = 7:43, and at a temperature of 280°C, fibers having the cross-sectional form of Figure 1 (al) were spun. .500m
It was wound up at a speed of /m1nn.

Next, it was stretched at a temperature of 90°C, 9x and a magnification of 3.2x, and then stretched at 150"C.
Heat setting was performed to obtain a drawn yarn of 75d/36f.

Using the above-mentioned drawn yarn as warp and warp yarns, weaved into glue-free taffeta, using an open soaper manufactured by Wakayama Tekko Co., Ltd., and using a scouring bath containing 2 g/l of Sunmol FL, a scouring agent manufactured by NICCA Kagaku Co., Ltd. After scouring with 'C' and drying, finishing setting was performed using a pin tenter manufactured by Jyukin Kogyo Co., Ltd. at 170"C for 20 seconds.

The obtained fabric has a frictional charging voltage of 450 V (the frictional charging voltage of a normal polyethylene terephthalate fabric is 4.000 V).
(v or higher), it shows excellent antistatic properties and has good white discoloration.

There was also little re-contamination due to washing (re-contamination level was level 4 to 5).
Met.

Comparative Example A finished fabric was obtained in the same manner as in the example without adding the fluorescent brightener [D].

This fabric was dyed using a circular jet dyeing machine manufactured by Hisaka Seisakusho, and 0.8% owf of Ciba Geigy's dispersed fluorescent white dye: Uvitex EBF and 0.2 m of 48% acetic acid were dyed.
l/jl! Dye at 130°C for 15 minutes in a dyeing bath containing
A finishing set was performed for 20 seconds.

In the dyeing and finishing process using fluorescent white dye.

In addition to staining and poor processing yield, the obtained fabrics had a high degree of recontamination due to washing (recontamination degree 1).
~2nd grade).

(Effects of the Invention) According to the white antistatic synthetic fiber of the present invention, there is no need for dyeing and finishing with a fluorescent white dye, which simplifies the process and reduces yield due to contamination in the dyeing and finishing process. is resolved.

Furthermore, products using the white antistatic synthetic fiber of the present invention are less likely to be recontaminated by washing, so they can maintain their whiteness for a long time.

[Brief explanation of the drawing]

Figures 1(a) to [C] show specific examples of the fibers of the present invention. FIG. 2 is a cross-sectional view showing an example of a spinneret device applied to obtain the fiber of the present invention. Patent applicant: Uni-Tei Riki Co., Ltd.

Claims (1)

[Claims] (1) A fiber-forming polymer [A] is used as a sheath component, a composition of a polyalkylene oxide component-containing block copolymer [B] and another polymer [C] is used as a core component, and [B] is in the fiber axis direction. Antistatic composite fibers are blended into [C] in the form of a plurality of substantially continuous bands or networks, and a fluorescent brightener [D] is blended only in the sheath component. A white antistatic synthetic fiber.