JP2006299428A - Ultraviolet light-absorbing polyester fiber excellent in clarity, fabric and method for weaving the fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultraviolet light-absorbing polyester fiber excellent in clarity and capable of readily carrying out weaving or knitting, and a fabric containing the polyester fiber and to provide a method for weaving the fabric. <P>SOLUTION: The ultraviolet light-absorbing polyester fiber excellent in clarity is composed of a polyester containing 0.1-5.0 wt.% organic ultraviolet light absorbent and ≤0.5 wt.% inorganic ultraviolet light absorbing and/or reflecting agent. The fabric comprises the ultraviolet light-absorbing polyester fiber. The method for weaving the fiber comprises carrying out weaving by using the ultraviolet light-absorbing polyester fiber as warp. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a UV-absorbing polyester fiber that is excellent in sharpness and easy to weave and weave, a fabric containing the polyester fiber, and a weaving method.

  Polyester fibers have many excellent features such as strength, dimensional stability, and easy care, so woven and knitted fabrics made of polyester fibers are used in a wide range of applications from clothing to industrial applications. Yes.

  On the other hand, in recent years, the harmfulness of ultraviolet rays contained in sunlight has become known, and it is desired to protect the skin from ultraviolet rays. For this reason, for the purpose of shielding ultraviolet rays, it has been proposed to include an inorganic ultraviolet absorbing and reflecting agent such as titanium dioxide in a polyester fiber (see, for example, Patent Document 1 and Patent Document 2).

However, polyester fibers that contain a large amount of inorganic UV absorbers and reflectors have a glossy dull tone, and even if they are dyed, vivid color developability (sharpness) cannot be obtained, and their use is limited. It was. Further, when knitting and weaving using such polyester fibers, there is a problem that wrinkles, healds and the like are easily worn by the inorganic fine particles contained in the polyester fibers and the weaving and knitting properties are lowered.
In Patent Document 3, a benzoxazine-based organic ultraviolet absorber is proposed.

JP-A-5-148734 JP-A-6-2219 JP 62-11744 A

  The present invention has been made in view of the above background, and an object of the present invention is to provide a UV-absorbing polyester fiber excellent in sharpness and easy to weave and weave, a fabric containing the polyester fiber, and a weaving method. .

  As a result of intensive investigations to achieve the above-mentioned problems, the present inventors have found that the polyester fiber contains an organic ultraviolet absorber and the inorganic ultraviolet absorber and the content of the reflective agent are reduced so that the sharpness is improved. The present inventors have found that an ultraviolet-absorbing polyester fiber that is excellent in knitting and weaving can be obtained, and has completed the present invention by intensive studies.

  Thus, according to the present invention, “it is composed of a polyester containing 0.1 to 5.0% by weight of an organic ultraviolet absorber and 0.5% by weight or less of an inorganic ultraviolet absorber and / or reflector. The characteristic UV-absorbing polyester fiber excellent in sharpness is provided.

  In that case, it is preferable that the organic ultraviolet absorber is a benzoxazine-based organic ultraviolet absorber. The ultraviolet absorbing polyester fiber of the present invention preferably contains no inorganic ultraviolet absorbing and / or reflecting agent. The single fiber fineness is preferably in the range of 0.1 to 5.0 dtex. The cross-sectional shape of such a single fiber is preferably an irregular shape, and in particular, it is preferably a flat cross-section having a cross-sectional flatness of 2 to 6 having two or more constricted portions.

Moreover, according to this invention, the fabric which comprises the said ultraviolet absorptive polyester fiber is provided.
Furthermore, according to the present invention, there is provided a weaving method for weaving a woven fabric using the UV-absorbing polyester fiber as a warp.

  According to the present invention, an ultraviolet-absorbing polyester fiber that is excellent in sharpness and easy to weave and weave, a fabric including the polyester fiber, and a weaving method are obtained.

Hereinafter, embodiments of the present invention will be described in detail.
First, as the polyester forming the ultraviolet absorbing polyester of the present invention, terephthalic acid is the main acid component, and alkylene glycol having 2 to 6 carbon atoms, that is, ethylene glycol, trimethylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene. Examples include polyesters having at least one glycol selected from the group consisting of methylene glycol, particularly preferably ethylene glycol as the main glycol component.

Such a polyester may have a small amount (usually 30 mol% or less) of a copolymer component as required.
In this case, examples of the bifunctional carboxylic acid other than terephthalic acid used include isophthalic acid, naphthalene dicarboxylic acid, diphenyldicarboxylic acid, diphenoxyethanedicarboxylic acid, β-hydroxyethoxybenzoic acid, P-oxybenzoic acid, 5 -Aromatic, aliphatic, and alicyclic bifunctional carboxylic acids such as sodium sulfoisophthalic acid, adipic acid, sebacic acid, and 1,4-cyclohexanedicarboxylic acid. Examples of the diol compound other than the glycol include aliphatic, alicyclic and aromatic diol compounds such as cyclohexane-1,4-dimethanol, neopentyl glycol, bisphenol A and bisphenol S, and polyoxyalkylene glycol. Can give.

  Such polyester may be synthesized by any method. For example, in the case of polyethylene terephthalate, terephthalic acid and ethylene glycol are directly esterified, or a lower alkyl ester of terephthalic acid such as dimethyl terephthalate is transesterified with ethylene glycol, or terephthalic acid and ethylene oxide are used. And the first stage reaction to produce a terephthalic acid glycol ester and / or its low polymer, and the first stage reaction product is heated under reduced pressure until the desired degree of polymerization is reached. It may be produced by a second stage reaction for condensation reaction.

  In the ultraviolet absorbing polyester fiber of the present invention, it is important that the polyester contains an organic ultraviolet absorber in an amount of 0.1 to 5.0% by weight (preferably 0.5 to 3.0% by weight) based on the weight of the polyester. It is. When the content of the organic ultraviolet absorber is less than 0.1% by weight, sufficient ultraviolet absorption performance cannot be obtained, which is not preferable. On the other hand, if the content of the organic ultraviolet absorber is greater than 5.0% by weight, the spinning process stability is impaired when the polyester containing the organic ultraviolet absorber is spun to obtain a polyester fiber. This is not preferable because the sharpness also decreases.

  Examples of organic ultraviolet absorbers contained in the polyester include benzoxazine organic ultraviolet absorbers, benzophenone organic ultraviolet absorbers, benzotriazole organic ultraviolet absorbers, and salicylic acid organic ultraviolet absorbers. Of these, benzoxazine-based organic ultraviolet absorbers are particularly preferred because they do not decompose at the spinning stage.

  Suitable examples of such benzoxazine-based organic ultraviolet absorbers are those disclosed in JP-A-62-1744. That is, 2-methyl-3,1-benzoxazin-4-one, 2-butyl-3,1-benzoxazin-4-one, 2-phenyl-3,1-benzoxazin-4-one, 2,2 '-Ethylenebis (3,1-benzoxazin-4-one), 2,2'-tetramethylenebis (3,1-benzoxazin-4-one), 2,2'-p-phenylenebis (3 1-benzoxazin-4-one), 1,3,5-tri (3,1-benzoxazin-4-one-2-yl) benzene, 1,3,5-tri (3,1-benzoxazine- 4-on-2-yl) naphthalene and the like.

  In addition, it is important that the polyester forming the UV-absorbing polyester fiber of the present invention contains 0.5% by weight or less of an inorganic UV absorbing and / or reflecting agent. The less the ultraviolet absorption and / or reflection agent contained in the polyester fiber of the present invention is, the better. If the content of the inorganic ultraviolet absorption and / or the reflection agent is more than 0.5% by weight, not only the sharpness is impaired but also the knitting property is unfavorable. Examples of the inorganic ultraviolet absorbing and / or reflecting agent include inorganic compounds such as titanium dioxide, zinc oxide, alumina, magnesium oxide, talc, carion, calcium carbonate, and sodium carbonate.

  The ultraviolet-absorbing polyester fiber of the present invention contains an organic ultraviolet absorber in an amount of 0.1 to 5.0% by weight and an inorganic ultraviolet absorber and / or a reflector in an amount of 0.5% by weight or less. The polyester having a thickness of 0.55 to 0.80 is spun by a conventional method, wound once as an unstretched yarn (intermediate oriented yarn) at a speed of 2000 to 4300 m / min, and may be stretched or before winding. It may be stretched. In addition, the intermediate oriented yarn is heat-treated in a relaxed state (overfeed 1.5 to 10%) using a heater heated to 180 to 200 ° C., so that an undrawn yarn having self-extensibility under heating ( Intermediately oriented yarn).

  In the ultraviolet absorbing polyester fiber of the present invention, the single fiber fineness is preferably in the range of 0.1 to 5.0 dtex. Moreover, as a form of a fiber, a short fiber may be sufficient and a long fiber (multifilament) may be sufficient. Among these, long fibers are preferable in order to reduce the amount of transmitted ultraviolet light by reducing the inter-structure voids in the case of a woven or knitted fabric. The total fineness and the number of filaments of such long fibers are preferably in the range of a total fineness of 33 to 330 dtex and a number of filaments of 10 to 100. In addition, the cross-sectional shape of the single fiber is not particularly limited, and may be a normal round cross section, or a flat cross section, a constricted flat cross section, a triangular cross section, a square cross section, a 3-14 leaf cross section, a hollow cross section, and the like. In particular, the modified cross section is preferable in order to reduce the inter-structure voids in the case of a woven or knitted fabric. In particular, when a flat cross section having a cross-sectional flatness of 2 to 6 having two or more constricted portions as schematically shown in FIG. 1 is adopted, the inter-tissue gap in the case of a woven or knitted fabric can be reduced, and A soft texture is obtained, which is preferable. The cross-sectional flatness is the ratio (B / C1) between the length (B) of the long side and the length (C1) of the short side shown in FIG. Further, the constricted portion is a portion where the length of the short side is shortened as schematically shown in FIG. In such a constricted portion, the depth of the concave portion is a depth that is 1.05 or more (preferably 1.1 or more) as a ratio (C1 / C2) of the maximum value and the minimum value of the length of the short side. It is preferable. FIG. 1 illustrates the case where there are three constricted portions.

  Next, the fabric of this invention is a fabric containing the said ultraviolet absorptive polyester fiber. Here, it is preferable that the ultraviolet absorbing polyester fiber is contained in the fabric in an amount of 40% by weight or more (more preferably 60% by weight or more, particularly preferably 100% by weight).

  In addition, the woven or knitted structure of the fabric is not particularly limited, and may be woven or knitted by a normal method. For example, examples of the woven structure of the woven fabric include a three-layer structure such as plain weave, twill weave and satin weave, a change structure, a single double structure such as a vertical double weave and a horizontal double weave, and a vertical velvet. The type of knitted fabric may be a weft knitted fabric or a newly knitted fabric. Preferred examples of the weft knitting structure include flat knitting, rubber knitting, double-sided knitting, pearl knitting, tuck knitting, float knitting, one-sided knitting, lace knitting, bristle knitting, and the like. Single atlas knitting, double cord knitting, half tricot knitting, back hair knitting, jacquard knitting and the like are exemplified. The number of layers may be a single layer or a multilayer of two or more layers.

  As long as the purpose of the present invention is not impaired, such a fabric has a conventional dye finish, water repellent finish, brushed finish, ultraviolet shielding or antibacterial agent, deodorant, insect repellent, phosphorescent agent, recursive agent. Various processings that impart functions such as a reflective agent and a negative ion generator may be additionally applied.

  As described above, the ultraviolet-absorbing polyester fiber of the present invention contains a specific amount of an organic ultraviolet absorber and contains a small amount or no inorganic ultraviolet absorber and / or reflector. The obtained fabric is excellent in sharpness. In addition, when the fabric is knitted and woven using the ultraviolet absorbing polyester fiber of the present invention, excellent weaving and knitting properties can be obtained because the wear of healds and wrinkles is small. In particular, weaving a woven fabric using the UV-absorbing polyester fiber of the present invention as a warp is particularly preferable because of reduced wear on healds and wrinkles.

Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.
<Intrinsic viscosity>
Measurement was carried out at 35 ° C. using orthochlorophenol as a solvent.
<Lightness index L>
The lightness index L was displayed in the L * a * b * display system shown in JIS Z 8729 (L * a * b * color system and object color display method using L * u * v * color system). The smaller the L value, the better the sharpness.
<Ultraviolet transmittance>
As a substitute characteristic of ultraviolet absorptivity, transmittance was measured with a spectrophotometer MPC-3100 manufactured by Shimadzu Corporation, and an ultraviolet transmittance in the range of 280 to 400 nm was calculated. The smaller the UV transmittance, the better the UV absorption.
<Cover factor (CF)>
It was calculated by the following formula.
CF = (DWp / 1.1) ^1/2 × MWp + (DWf / 1.1) ^1/2 × MWf
However, DWp is the total warp fineness (dtex), MWp is the warp weave density (main / 2.54 cm), DWf is the total weft fineness (dtex), and MWf is the weft weave density (main / 2.54 cm).
<Heald wear>
After weaving the woven fabric, in terms of wear of the mail part of the heald (hole through which the warp passes), there are three stages: Grade 3: little wear, Grade 2: little wear, Grade 1: wear. Evaluated.

[Example 1]
1.0% by weight of 2,2′-p-phenylenebis (3,1-benzoxazin-4-one) organic ultraviolet absorber synthesized by the method described in JP-A No. 62-11744 Polyethylene terephthalate having an intrinsic viscosity of 0.60, which does not contain an inorganic ultraviolet absorbing and / or reflecting agent such as titanium dioxide, is spun and stretched by a conventional method to obtain a polyester multifilament (total fineness of 84 dtex / 36 filaments) was obtained.

Next, a plain-textured fabric having a warp density of 47 yarns / cm and a weft density of 38 yarns / cm was woven using the UV-absorbing polyester fiber in a non-twisted manner for warp and weft yarns. And the dyeing | finishing process of the usual method was given without using dye, and the white textile fabric (CF = 2190) was obtained.
In the obtained woven fabric, the ultraviolet transmittance was 9% and the L value was 83, which was excellent in ultraviolet absorptivity and sharpness. In addition, heald wear was grade 3 (little wear) and was excellent in weaving.

[Example 2]
In Example 1, the polyester multifilament 84dtex / 30f having a flat cross section (cross section flatness 3.2) having three constricted portions (C1 / C2 = 1.2) as shown in FIG. Except for changing to a filament, the procedure was the same as in Example 1.
In the obtained woven fabric, the ultraviolet transmittance was 8% and the L value was 83, which was excellent in ultraviolet absorptivity and sharpness. Furthermore, it was a soft texture. In addition, heald wear was grade 3 (little wear) and was excellent in weaving.

[Example 3]
In Example 1, 1.0% by weight of 2,2′-p-phenylenebis (3,1-benzoxazin-4-one) organic ultraviolet absorber and 0.05% of titanium dioxide in polyethylene terephthalate %, Except that it was included.
The obtained woven fabric had an ultraviolet transmittance of 9% and an L value of 85, and was excellent in ultraviolet absorption and sharpness. In addition, heald wear was grade 3 (little wear) and was excellent in weaving.

[Example 4]
In Example 1, 0.5% by weight of 2,2′-p-phenylenebis (3,1-benzoxazin-4-one) organic ultraviolet absorber and 0.4% of titanium dioxide in polyethylene terephthalate %, Except that it was included.
The obtained woven fabric had an ultraviolet transmittance of 15% and an L value of 86, which was slightly superior in ultraviolet absorption and sharpness. Further, the wear of the heald was second grade.

[Example 5]
In Example 1, except that 5.0% by weight of 2,2′-p-phenylenebis (3,1-benzoxazin-4-one) organic ultraviolet absorber is contained in polyethylene terephthalate. And so on.
In the obtained woven fabric, the ultraviolet ray transmittance was 7% and the L value was 87, which was excellent in ultraviolet ray absorbability and sharpness. In addition, heald wear was grade 3 (little wear) and was excellent in weaving.

[Comparative Example 1]
In Example 1, polyethylene terephthalate does not contain 2,2′-p-phenylenebis (3,1-benzoxazin-4-one) organic ultraviolet absorber and contains 2.5% by weight of titanium dioxide. The procedure was the same as in Example 1 except that
In the obtained woven fabric, the ultraviolet transmittance was 12% and the L value was 92, which was inferior in sharpness. In addition, the wear of the heald was first grade and inferior in weaving.

[Comparative Example 2]
In Example 1, 1.0% by weight of 2,2′-p-phenylenebis (3,1-benzoxazin-4-one) organic ultraviolet absorber was added to polyethylene terephthalate, and titanium dioxide was added in an amount of 2.% by weight. Example 1 was repeated except that 5% by weight was included.
The obtained woven fabric was inferior in sharpness with an ultraviolet transmittance of 8% and an L value of 93. In addition, the wear of the heald was first grade and inferior in weaving.

[Comparative Example 3]
Example 1 was the same as Example 1 except that polyethylene terephthalate did not contain 2,2′-p-phenylenebis (3,1-benzoxazin-4-one) organic ultraviolet absorber. .
The obtained woven fabric was inferior in ultraviolet absorptivity with an ultraviolet transmittance of 45% and an L value of 83. The wear of the heald was grade 3.

[Comparative Example 4]
In Example 1, except that 9.0% by weight of 2,2′-p-phenylenebis (3,1-benzoxazin-4-one) organic ultraviolet absorber is contained in polyethylene terephthalate. And so on.
The obtained woven fabric was inferior in sharpness with an ultraviolet transmittance of 4% and an L value of 95. Further, the wear of the heald was grade 3.

  According to the present invention, an ultraviolet-absorbing polyester fiber that is excellent in sharpness and easy to weave and weave, a fabric including the polyester fiber, and a weaving method are obtained. Such fabrics can be used for applications such as curtains, general fashion for men and women, sports clothing, national costumes in the Middle Eastern countries, hats, parasols, etc., and their industrial value is extremely large.

In the ultraviolet-absorbing polyester fiber of the present invention, a flat cross-sectional shape having a constricted portion that can be adopted as a cross-sectional shape of a single fiber is schematically illustrated.

Explanation of symbols

1 Constriction

Claims (8)

  It is excellent in sharpness, characterized by comprising a polyester containing 0.1 to 5.0% by weight of an organic ultraviolet absorber and 0.5% by weight or less of an inorganic ultraviolet absorber and / or reflector. UV-absorbing polyester fiber.   The ultraviolet-absorbing polyester fiber excellent in sharpness according to claim 1, wherein the organic ultraviolet absorber is a benzoxazine-based organic ultraviolet absorber.   The ultraviolet-absorbing polyester fiber excellent in sharpness according to claim 1 or 2, which does not contain an inorganic ultraviolet absorbing and / or reflecting agent.   The ultraviolet-absorbing polyester fiber excellent in sharpness according to any one of claims 1 to 3, wherein the single fiber fineness is in the range of 0.1 to 5.0 dtex.   The ultraviolet-absorbing polyester fiber excellent in sharpness according to any one of claims 1 to 4, wherein the cross-sectional shape of the single fiber is atypical.   The ultraviolet-absorbing polyester fiber excellent in sharpness according to claim 5, wherein the cross-sectional shape of the single fiber is a flat cross-section having a flatness of 2 to 6 having two or more constricted portions.   A fabric comprising the ultraviolet-absorbing polyester fiber according to any one of claims 1 to 6.   A weaving method for weaving a woven fabric using the ultraviolet-absorbing polyester fiber according to any one of claims 1 to 6 as a warp.

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