JPH1112848A - Spun-dyed polyester yarn for seat belt and seat belt webbing using the same spun-dyed yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain both a spun-dyed polyester yarn for seat belts, excellent in color fastness to light and color tone and colored to gray and a seat belt webbing using the spun-dyed yarn. SOLUTION: This spun-dyed polyester yarn contains a phthalocyanine-based blue pigment, a threne-based purple pigment, carbon black and titanium oxide in a polyethylene terephthalate having >=0.8 intrinsic viscosity and is capable of manifesting an absorption spectrum respectively having the absorption peaks A and B within the ranges of 610-620 nm wavelength and 680-690 nm wavelength, has 0.55-0.65 absorbance ratio R (A/B) of the absorption peaks A and B and the titanium oxide content W (wt.%) satisfying the formula 0.01<=W<=0.08×C/L [L is the color value L of the spun-dyed yarn; C is the crystallinity (%) of the spun-dyed yarn]. The spun-dyed polyester yarn is colored to gray and the seat belt webbing uses the spun dyed polyester yarn as a warp yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gray polyester yarn for seat belts having excellent light fastness and color tone and a seat belt webbing using the yarn for warp.

[0002]

2. Description of the Related Art A vehicle seatbelt originally restrains an occupant's body at the time of a collision of a vehicle to prevent the occupant from being thrown out of the vehicle or colliding with a windshield, etc.
Its main purpose is to reduce the impact on the occupant in the event of a collision. For this reason, the characteristics required for the webbing for the seat belt include, firstly, a reduction in the impact energy received by the occupant in the event of a collision, and secondly, a durability capable of being used for a long period of time under severe conditions. It is also mentioned that it also has basic characteristics such as light weight and storability.

[0003] In addition to such a role related to safety, a seat belt is also required to have a design role as an interior material of an automobile, that is, an external effect such as shape, pattern, and color. In particular, color must be completely harmonized with the pattern and color tone of the sheet material, which has been required to have a more individualized design in recent years, so it is an important element that can not be neglected in car interior design, and black color tone is the mainstream Seat belts are now demanding a variety of hues with slightly different colors.

Conventionally, a method using dyeing has been adopted to meet such demands for various color tones. However, there is a problem in that a waste dye solution remaining after dyeing is discharged to a periphery of a dyeing processing plant, thereby polluting the natural environment. Seat belts used in harsh conditions, in which fibers colored by dyeing have poor light stability because the colorant is diffused at the molecular level, and will fade in environments exposed to strong direct sunlight. It has a fatal drawback for use. For this reason, coloring that does not depend on dyeing has been required.

[0005] In order to solve the problems caused by the dyeing process, a soaked yarn in which a colorant is directly contained in the fiber in the process of fabricating the yarn has been proposed (JP-A-7-207758, JP-A-7-207758). 258918, etc.). Indeed, according to this method, not only the dyeing step can be omitted, but also the colorant is dispersed and collected in the form of particles, so that the light stability is dramatically improved, and a seat belt having excellent light fastness is obtained. be able to. However, the conventional yarn for seat belts is a black yarn using mainly carbon black as a coloring agent. However, a practical one has not yet been proposed.

[0006] One of the causes is that it is difficult to adjust the color of the dyed yarn having an intermediate color tone and the reproducibility is poor. In particular, in webbings for seat belts, the ratio of light reflection on the surface of the woven fabric is high due to the high warp density, so that the color tone looks greatly different depending on the viewing direction and angle, and it is difficult to adjust the color tone. That is, when viewed from an angle where the light reflection component is large, a particular bluish or reddish color is excessively emphasized, and there is no sense of unity in color tone when viewed from an angle where the light reflection component is small, resulting in poor quality. Would.

Further, the polyester yarn for seat belts has a drawback that light is easily reflected on the yarn surface due to its high degree of crystallization, and the hue of the original yarn is not deep. Is particularly prominent in the gray polyester yarn. In addition, the gray dyed yarn has the disadvantage that the color tone looks different depending on the light intensity and the type of light source, and the color tone is inferior and inferior in color under a strong light source. .

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above prior art, and has as its object to provide a seat belt having high light fastness and excellent color tone without requiring dyeing. It is another object of the present invention to provide a gray polyester dyed yarn for a seat belt, and a seat belt webbing using the dyed yarn.

[0009]

According to the study of the present inventors, the object of the present invention is to provide a phthalocyanine-based polyester in a polyester having a main repeating unit of ethylene terephthalate and an intrinsic viscosity of 0.8 or more. It contains a blue pigment, a sulene-based violet pigment, carbon black and titanium oxide, and has a wavelength of 610 to 620 nm and a wavelength of 680 to 680.
An absorption spectrum having absorption peaks A and B in the range of 690 nm is shown, and the absorbance ratio R (A / B) of the absorption peaks A and B is 0.55 to 0.65. A polyester dyed yarn for a seat belt colored in gray, wherein W satisfies the following formula, and a seatbelt webbing in which a warp yarn is constituted by the dyed yarn. To achieve this. 0.01 ≦ W ≦ C / L × 0.08 [where W is the titanium oxide content (% by weight) in the original yarn,
L is the color L value of the original yarn, C is the crystallinity of the original yarn (%)
Is shown. ]

[0010]

DETAILED DESCRIPTION OF THE INVENTION The polyester used in the present invention is:
It is necessary that the main repeating unit is a polyester composed of ethylene terephthalate and has an intrinsic viscosity of 0.8 or more, preferably 0.85 or more. If the intrinsic viscosity is less than 0.8, the strength required for the seat belt cannot be obtained, which is not preferable. The upper limit of the intrinsic viscosity is not particularly limited, but if it is too high, melt spinning becomes difficult. In addition,
The above-mentioned "main" means 90 mol% or more, preferably 95 mol% or more of the repeating unit, and the third component may be copolymerized within a range not to impair the object of the present invention.

As the colorant used for the polyester dyed yarn of the present invention, in order to obtain a deep gray dyed yarn, a phthalocyanine-based blue pigment, a sulene-based violet pigment and a carbon It is important to use a combination of black. The use ratio of these colorants varies depending on the intended hue and brightness, but in the visible light absorption spectrum (absorbance curve), the wavelength is 61%.
0 to 620 nm and wavelengths 680 to 690 nm, respectively, and have absorption peaks A and B, respectively, and the absorbance ratio R (A / B) of the absorption peaks A and B is 0.55 to
It is necessary to combine them to be 0.65. Wavelength 61
0-620 nm range or wavelength 680-690 nm
Absorption spectrum having no maximum absorption peak in the range, or the absorption ratio R (A / B) of absorption peaks A and B is 0.55 to
When the absorption spectrum is out of the range of 0.65, the depth of the gray color is insufficient, which is not preferable. As long as the above requirements are satisfied, the higher the carbon black content is, the more the total amount of the coloring agent is reduced, which not only improves the process stability during yarn production, but also improves the light fastness. Is also preferred.

It is important that the dyed polyester yarn of the present invention further contains the coloring agent titanium oxide in addition to the above-mentioned coloring agent within a range satisfying the following formula. 0.01 ≦ W ≦ C / L × 0.08 where W is the titanium oxide content (% by weight) in the original yarn, L
Indicates the color L value of the original yarn, and C indicates the crystallinity (%) of the original yarn.

[0013] Conventionally, it has been considered that it is preferable not to use polyester-dyed yarns, such as those used for clothing, in combination with titanium oxide because the hue becomes dull when titanium oxide is used in combination. However, according to the study of the present inventors, high-strength polyester fibers for use in industrial materials such as seat belts have a high degree of crystallinity, so that the light reflection on the yarn surface is large, and therefore, the glossiness depends on the viewing direction. Is emphasized, the color tone looks different, and such a phenomenon is caused by including the specific amount of titanium oxide in the fiber, so that the light reflection on the yarn surface becomes less isotropic depending on the viewing direction, and the depth is significantly increased. It has been found that a certain gray color is achieved.

When the content of titanium oxide is less than 0.01% by weight (based on the weight of polyester), the effect of suppressing light reflection is insufficient, and a deep gray color cannot be obtained.
On the other hand, as the degree of crystallinity of the original yarn becomes higher, even if the content of titanium oxide increases, the effect of improving the depth of gray by the light reflection suppressing effect becomes larger than the hue dulling effect of titanium oxide. The range of the titanium oxide content that achieves the object of the present invention is large, and conversely, as the lightness of the original yarn increases, the hue dulling effect of the titanium oxide increases even if the titanium oxide content is small, so that the titanium oxide content The amount must be not more than [0.08 × C / L]% by weight in the above formula. Here, C represents the crystallinity (%) of the original yarn, and L represents the color L value of the original yarn.

As a method of adding a colorant, a method of adding in a polyester production process, a method of mixing with a polyester chip and melt-spinning, a method of directly adding to a molten polyester at the time of spinning, and a method of containing a colorant in a high concentration A conventionally known method such as a method of mixing and melt-spinning a master chip to be mixed with a base polymer containing no colorant can be applied. Among them, the method using a master chip is simple, and the operation stability and the production cost are reduced. Is particularly preferred.

The polyester-dyed yarn for a seat belt of the present invention preferably has high strength in order to withstand the impact at the time of vehicle collision, and it is at least 8.0 g / de, particularly at least 9.0 g / de. It is desirable.

The original polyester yarn for seat belt of the present invention can be produced, for example, by the following method. That is, a polyester having an intrinsic viscosity of 1.0 or more ethylene terephthalate as a main repeating unit,
A colorant is preliminarily blended with a master chip in which 5% by weight or more, preferably 10% by weight or more of the colorant is uniformly dispersed in polyester, and melted and discharged from a spinneret by a conventional method. The mixing ratio of the blue pigment, violet pigment, carbon black, and titanium oxide in the coloring agent is such that the absorption peaks A and B are respectively in the wavelength ranges of 610 to 620 nm and 680 to 690 nm of the absorption spectrum of the obtained original yarn. At the same time, the absorbance ratio R (A / B) of the absorption peaks A and B is adjusted to 0.55 to 0.65.
The blending ratio of the master chip is appropriately adjusted according to the pigment concentration in the master chip so that a desired color can be obtained. Titanium oxide can be previously added to the polyester during polymerization, but it is preferable to add it to the master chip in order to adjust the amount of addition.

The discharged yarn is 300 to 2000 m /
Min, preferably at a take-off speed of 500 to 1500 m / min.
Stretch 6.5 times. Here, if the draw ratio is less than 4.0 times, it becomes difficult to obtain the strength required for the seat belt, while if the draw ratio exceeds 6.5 times, thread breakage frequently occurs in the drawing step. , Stable production becomes difficult. The stretching may be performed in one step or may be performed in two or more steps in multiple steps. In addition, the spinning step and the stretching step may be performed continuously, or may be wound once after spinning and then stretched in another step, but the former method is more preferable from the viewpoint of productivity.

In the seat belt webbing of the present invention, the warp is constituted by the above-mentioned polyester original yarn. Specifically, the above-mentioned polyester original yarn (about 1500
(Denier) 290 to 320 yarns are used as warps and woven in accordance with a conventional method. The thus obtained seatbelt webbing of the present invention is further processed with a resin to be processed into a seatbelt.

[0020]

The present invention will be described more specifically with reference to the following examples. In addition, each characteristic in an Example was evaluated by the following method. <Intrinsic viscosity> Orthochlorophenol was used as a solvent and measured at a temperature of 30 ° C. <Strength and elongation> Measured according to JIS L1017.

<Absorption spectrum> Original polyester yarn 6
0 mg was added to orthochlorophenol ml and 100 mg was added.
Dissolve at 30 ° C for 30 minutes. Next, this solution was used by Hitachi, Ltd.
Made with a 320-type self-recording spectrophotometer manufactured by
The absorption peaks in the range of 0 nm and 680 to 690 nm were designated as A and B, respectively, and the absorbance ratio R (A / B) of the absorption peaks A and B was determined.

<Crystallinity> The crystallinity was determined by an X-ray diffraction method using a wide-angle / small-angle X-ray device manufactured by Rigaku Corporation. <Color L value>
At 0mm width, align and align so that there is no surface disturbance,
This was measured with a Macbeth-2020 colorimeter.

<Color Tone> The naked eye was judged under natural light, and evaluated in three steps based on the following criteria. ：: There is little difference in hue from any direction, and there is no glare on the webbing surface. Δ: The hue is slightly different depending on the viewing direction, and the gloss of the webbing surface is slightly large. × 1: The hue greatly differs depending on the viewing direction, the gloss of the webbing surface is large, and there is a unique glare. × 2: The hue does not change depending on the viewing direction, but the color tone is strong and dull as a whole.

Example 1 In a polyethylene terephthalate chip having an intrinsic viscosity of 1.0, 3.0% by weight of titanium oxide, 2.0% by weight of a phthalocyanine-based blue pigment, 1.5% by weight of a sulene-based violet pigment, and carbon black 5.0% by weight
Was blended in a weight ratio of 97: 3. This blended chip is melted and kneaded by a conventional method, and has a pore size of 0.5
After spinning out from a spinneret having a nozzle hole of 144 mm in diameter and having a hole number of 144H, and solidified by cooling, it was taken out at a take-up speed of 800 m / min to obtain an undrawn yarn.

The obtained unstretched yarn was stretched at a draw ratio of 5.0 without being wound up once to obtain a soaked yarn having a fineness of 1500 denier, a strength of 9.2 g / de and an elongation of 14%. In addition, the intrinsic viscosity of the soaked yarn was 0.89, and the crystallinity was 56.5.
%, Lightness (L value) is 40.2, and absorbance ratio R (A / B)
Was 0.61.

The original yarn was used as a warp, and the weft was made of 630 denier / 72 filament polyester fiber, and a 51 mm wide seat belt webbing was woven. Next, the obtained woven fabric was immersed in an aqueous dispersion of a polyester-based urethane resin, squeezed, and then heat-treated at 180 ° C. for 2 minutes to obtain a 49 mm-wide webbing for a seat belt. Table 1 shows the hue evaluation of the obtained webbing.

Example 2 A polyethylene terephthalate master chip containing 1.0% by weight of titanium oxide, 2.0% by weight of a phthalocyanine-based blue pigment, 1.5% by weight of a sulene-based violet pigment, and 5.0% by weight of carbon black Using the same procedure as in Example 1, an original yarn was obtained. The obtained original yarn had a fineness of 1500 denier, a strength of 9.2 g / de, an elongation of 14%, a crystallinity of 56.5%, and an L value of 39.8. Further, Table 1 shows the hue evaluation results of the seatbelt webbing obtained from the original yarn in the same manner as in Example 1.

EXAMPLE 3 A polyethylene terephthalate master chip containing 1.0% by weight of titanium oxide, 2.0% by weight of a phthalocyanine-based blue pigment, 1.5% by weight of a sulene-based violet pigment, and 5.0% by weight of carbon black Using the same procedure as in Example 1, an original yarn was obtained. The obtained original yarn had a fineness of 1500 denier, a strength of 9.2 g / de, an elongation of 14%, a crystallinity of 56.5%, and an L value of 30.4. Further, Table 1 shows the hue evaluation results of the seatbelt webbing obtained from the original yarn in the same manner as in Example 1.

[Comparative Example 1] A polyethylene terephthalate master chip containing 2.0% by weight of a phthalocyanine-based blue pigment, 1.5% by weight of a sulene-based violet pigment, and 5.0% by weight of carbon black and containing no titanium oxide was used. A webbing was manufactured in the same manner as in Example 1 except that the webbing was used. Table 1 shows the results of evaluating the hue of the obtained webbing.

Comparative Example 2 A polyethylene terephthalate master chip containing 5.0% by weight of titanium oxide, 2.0% by weight of a phthalocyanine-based blue pigment, 1.5% by weight of a sulene-based violet pigment, and 5.0% by weight of carbon black The same procedure as in Example 1 was carried out except for using, to obtain an original yarn. The obtained original yarn has a fineness of 1500 denier and a strength of 9.2 g / d.
e, elongation 14%, crystallinity 56.5%, L value 4
1.3. Table 1 shows the hue evaluation results of the seatbelt webbing obtained in the same manner as in Example 1 from the obtained original yarns.

Comparative Example 3 A polyethylene terephthalate master chip containing 3.0% by weight of titanium oxide, 2.0% by weight of a phthalocyanine-based blue pigment, 1.5% by weight of a sulene-based violet pigment, and 2.0% by weight of carbon black And a stretched yarn was obtained in the same manner as in Example 1 except that the draw ratio was set to 4.5 times. The obtained original yarn had a fineness of 1500 denier, a strength of 8.1 g / de, an elongation of 19%, a crystallinity of 48.2%, and an L value of 51.4. Table 1 shows the hue evaluation results of the seatbelt webbing obtained in the same manner as in Example 1 from the obtained original yarns.

Comparative Example 4 The procedure of Example 1 was repeated except that a polyethylene terephthalate master chip containing 1.0% by weight of titanium oxide, 2.0% by weight of a phthalocyanine-based blue pigment, and 5.0% by weight of carbon black was used. The original yarn was obtained in the same manner. The obtained original yarn has a fineness of 1500 denier, a strength of 9.2 g / de, an elongation of 14%, and a crystallinity of 5%.
6.3%, the L value was 46.3, the absorption spectrum had only one absorption peak, and the hue was completely different from the current dyed product. Table 1 shows the hue evaluation results of the seatbelt webbing obtained in the same manner as in Example 1 from the obtained original yarns.

Comparative Example 5 A polyethylene terephthalate master chip containing 1.0% by weight of titanium oxide, 2.0% by weight of a phthalocyanine-based blue pigment, 0.5% by weight of a sulene-based violet pigment, and 5.0% by weight of carbon black The same procedure as in Example 1 was carried out except for using, to obtain an original yarn. The obtained original yarn has a fineness of 1500 denier and a strength of 9.2 g / d.
e, elongation 14%, crystallinity 55.8%, L value 4
2.6, and the absorbance ratio R (A / B) was 0.46.
Also, the hue was completely different from the current dyed product. Table 1 shows the hue evaluation results of the seatbelt webbing obtained in the same manner as in Example 1 from the obtained original yarns.

[0034]

[Table 1]

[0035]

As described in detail above, the polyester spun yarn of the present invention contains the coloring agent specified as described above, and its absorption spectrum satisfies the above requirements. For the first time, it is a dyed yarn in which a gray color having a deep color tone similar to that of a dyed product is realized, and is effective for improving the design role of a seat belt, which has been increasingly required in recent years. In addition, the seat belt webbing of the present invention does not require a dyeing step, so that the production cost can be reduced, and the dyed product has excellent light fastness and friction fastness not found in dyed products, and its color tone can be maintained for an extremely long time. Can be maintained.

Claims (2)

[Claims] 1. A polyester having a main repeating unit of ethylene terephthalate and an intrinsic viscosity of 0.8 or more, a phthalocyanine blue pigment, a sulene purple pigment,
It shows an absorption spectrum containing carbon black and titanium oxide and having absorption peaks A and B in the wavelength range of 610 to 620 nm and 680 to 690 nm, respectively, and an absorbance ratio R (A / A / B) of the absorption peaks A and B. B) is 0.55 to 0.65, and the titanium oxide content W satisfies the following expression: a polyester dyed yarn for a seat belt colored in gray. 0.01 ≦ W ≦ C / L × 0.08 [where W is the titanium oxide content (% by weight) in the original yarn,
L is the color L value of the original yarn, C is the crystallinity of the original yarn (%)
Is shown. ] 2. A seat belt webbing, wherein the warp yarn is constituted by the original yarn according to claim 1.