JPH10121323A - Polyester spun dyed yarn for seat belt and production of webbing for seat belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyester spun dyed yarn used for a seat belt, not requiring a dyeing process and a resin-processing process in a process for producing a seat belt webbing, and having a high strength and a durable slipping property. SOLUTION: This polyester spun dyed yarn has an intrinsic viscosity of 0.8-1.0 and a breaking strength of >=8.0g/de. Therein, a reactive resin and a smoothing agent are adhered to the yarn in amounts of 0.02-0.2wt.%, respectively, based on the weight of the yarn, and the yarn can be woven and subsequently thermally treated to form the woven fabric having a slipping efficiency of >=50% and a slipping efficiency maintenance factor of >=80%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spun polyester fiber for a seat belt, and more particularly to a spun polyester fiber for a seat belt having high strength, excellent slipperiness, and excellent durability.

[0002]

2. Description of the Related Art In recent years, in the field of textiles for industrial materials, there has been a strong demand for cost reduction, and studies on the omission of steps and the like have been made. For example, the use of fibers to be stained due to the omission of the dyeing step is a manifestation thereof. Japanese Patent Application Laid-Open No. 7-207582 proposes that a relatively high molecular weight smoothing agent be applied to the surface of the original fiber in order to omit the dyeing step and the resin processing step in the fabric for seat belt. However, if the seat belt to which the smoothing agent is attached has been used for a long period of time, the smoothing agent is removed due to repeated friction with the sash guide and friction when the seat belt is pulled out and stored when the seat belt is attached or detached. In addition, the slipperiness of the woven fabric is reduced, and the slippage efficiency is reduced.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a high-strength, durable, slippery polyester polyester for seat belts which does not require a dyeing step and a resin processing step in the manufacturing process of the seat belt webbing. Provide fiber.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventor has solved the above-mentioned problems for the first time by applying a reactive resin and a smoothing agent to the surface of the spun fiber. It was found that the present invention was completed. That is, according to the present invention, the following polyester spun fibers for seat belts are provided.

(1) In a polyethylene terephthalate-based soaked fiber containing a colorant having an intrinsic viscosity of 0.8 to 1.0 and a cutting strength of 8.0 g / de or more, a reactive resin and a smoothing agent are provided on the fiber surface. Is 0.02-
0.2% by weight adhered, and the fabric after weaving and heat-treating the fiber has a sliding efficiency of 50% or more and a sliding efficiency maintenance rate of 80% or more, and is a polyester raw material for seat belts. fiber.

(2) The polyester fiber for seat belt as described in (1) above, wherein the reactive resin is a composition containing a urethane resin and a silicon resin.

(3) The polyester fiber for seat belt as described in (1) above, wherein the reactive resin is a composition containing a urethane resin, a silicon resin and an acrylic resin.

[0008] (4) The polyester-dyed fiber for a seat belt according to any one of the above (1) to (3), wherein the smoothing agent comprises a silicone-based and / or polyetherester-based composition.

Further, according to the present invention, there is provided the following method for producing a webbing for a seat belt.

[0010] Polyethylene terephthalate-based undrawn fibers having an intrinsic viscosity of 0.8 to 1.0 and containing a colorant are subjected to drawing heat treatment to give a cutting strength of 8.0 g / de or more. Producing a webbing for a seat belt, comprising applying a mixed solution with a leveling agent, winding the web, weaving a web for a seat belt using the obtained drawn fibers, and heat-treating the woven fabric at 150 to 180. Method.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The original polyester fiber of the present invention is composed of polyethylene terephthalate having an intrinsic viscosity of 0.8 to 1.0. If the intrinsic viscosity is less than 0.80, it is difficult to achieve the strength required for a seat belt, and if the intrinsic viscosity is more than 1.0, it is impossible to stably produce yarn. In addition, polyethylene terephthalate has
A small amount of additives other than the copolymer component and the colorant, for example, a heat-resistant agent may be included.

[0012] The original polyester fiber of the present invention has a strength of 8.0 g / de or more, preferably 8.5 to 10.5 g / depth.
It is necessary that it be equal to or greater than de. 8.0 g / d strength
In the case of less than e, in order to obtain the strength as a seat belt, it is necessary to increase the number of warps of the woven fabric,
The thickness and width increase, which is not preferable. 10.5g
When the ratio exceeds / de, the current technology has many fluffs on the yarn, and the seat belt product quality becomes poor.

The dyed polyester fiber of the present invention is prepared by adding an inorganic or / and organic dye or / and / or pigment colorant by a conventionally known apparatus and method in order to color the polyester fiber. Hue.

Further, the polyester spun fiber of the present invention comprises:
It is necessary that the woven fabric after weaving into a woven fabric for a seat belt and subjected to a heat treatment has a sliding efficiency of 50% or more and a sliding efficiency maintenance ratio of 80% or more.

Here, the sliding efficiency and the sliding efficiency maintenance rate are shown in FIG.
Was measured by the following method using the apparatus described above. In FIG. 1, 1 is a sash guide, 2 is a weight for weight,
Reference numeral 3 denotes a satin guide pin, and reference numeral 4 denotes a belt fabric.

(1) Sliding efficiency A weight of 500 g was used as a weight for weighting, a matting guide pin having a diameter of 8 mm was used, and the belt fabric was 300 m / m2.
It reciprocates at a speed of one minute, measures the tension F1 at the time of pulling and the tension F2 at the time of retraction, and calculates the sliding efficiency by the following equation. Sliding efficiency (%) = (F2 / F1) ^1/2 × 100

(2) Sliding efficiency maintenance rate In the apparatus of FIG. 1, the weight for weight was changed to 1.0 kg.
Under an atmosphere of 40 ° C., the belt fabric is woven at a speed of 300 m / min.
A total of 40,000 reciprocating ironing operations are performed each time, and the sash guide is changed each time, and then the sliding efficiency is measured and calculated by the same method as in (1) to obtain a sliding efficiency of 40,000 times. The sliding efficiency maintenance rate is expressed as a percentage obtained by dividing the sliding efficiency value of 40,000 times by the sliding efficiency value of the item (1).

If the sliding efficiency is less than 50%, trouble occurs when pulling out and storing the seat belt, and the sliding efficiency becomes 50%.
If the sliding efficiency maintenance ratio is less than 80% even if the percentage is not less than 80%, there is a problem that the seat belt cannot be stowed when used for a long time.

In order to set the slipping efficiency and the slipping efficiency maintenance ratio to the above-mentioned predetermined values, the polyester-dyed fiber according to the present invention has:
A reactive resin and a smoothing agent for lowering the coefficient of friction are added to the fiber surface in an amount of 0.02 to 0.2 wt% based on the weight of the fiber.
The reactive resin is preferably composed of a mixture of a silicon-based resin having dimethylpolysiloxane as a main component for lowering the coefficient of friction and a urethane-based resin having a property of sticking to fibers, and an acrylic resin is further mixed therein. Further preferred compositions are: These resins have the property of reacting with each other by heat treatment of a seat belt woven fabric made of polyester fibers to which the resin is attached. The leveling agent is preferably composed of a silicone-based and / or polyetherester-based composition that reduces the coefficient of friction.

As the silicon-based composition, dimethyl silicon having a molecular weight of 100,000 to 5,000,000 is preferable, while the polyetherester-based composition is obtained from polyoxyethylene glycol and isophthalic acid and terephthalic acid, and has a molecular weight of 10,000 or more is preferable, and 10,000 to 1
More preferably, it is 100,000.

In the present invention, a durable slip property can be obtained by using the above-mentioned reactive resin and a smoothing agent together for the following reasons.

That is, when the urethane resin alone is used as the reactive resin, the adhesion of the resin component to the fiber via the smoothing agent tends to be uneven, and it is difficult to obtain a uniform sliding efficiency. By adding the resin, uniform fixability is obtained, and a reaction with the mixed silicon-based resin occurs, so that the low friction characteristics of the silicon-based resin are maximized. Further, when the leveling agent is a mixture of the silicone composition and the polyetherester composition, the compatibility with the reactive resin is improved, and the tackiness of the reactive resin is improved. The unreacted reactive resin adhered to the fiber surface has tackiness and increases friction. Therefore, by adding the smoothing agent in the same amount or more than the reactive resin, the friction between fibers, the friction between fibers and guides, and the friction between fibers and metals can be significantly reduced, and the adhesive property can be made harmless. . It is essential that the reactive resin and the smoothing agent adhere to the outermost surface of the fiber surface in order to improve the sliding efficiency and the sliding efficiency maintenance rate. Is applied in the state of a mixed solution of the reactive resin and the leveling agent at the stage.

It is preferable that the apparatus for applying before the drawing and winding is to supply a mixed solution of the reactive resin and the smoothing agent to the slit-shaped nozzle in a fixed amount, and to apply the solution by running the yarn through the slit. If applied before stretching, sticky scum adheres to the stretching rollers and guides, and the stretchability is deteriorated. If the amount of the reactive resin adhered is less than 0.02% by weight, it is difficult to maintain a low friction coefficient after the reaction, and the sliding efficiency maintenance rate becomes poor at less than 80%. 0.20% by weight
If it exceeds, the adhesiveness becomes too strong. Preferably 0.0
It is preferable to provide 5 to 0.15% by weight. The ratio of the reactive resin between the silicon type and the urethane type is preferably from 30:70 to 70:30. The ratio of the reactive resin of silicone type, urethane type and acrylic type is 40:
It is preferred to be in the range of 30:30 to 60:20:20. On the other hand, if the adhesion amount of the smoothing agent is less than 0.02% by weight, the effect of detoxification by reducing the adhesiveness of the reactive resin and the effect of a sliding efficiency of 50% or more are not exhibited. Becomes defective. Preferably, the content is 0.05 to 0.15% by weight.

In the present invention, a desired web for a seatbelt is woven using the above-mentioned drawn fiber according to a conventional method, and the woven fabric is heat-treated at 150 to 180 ° C. to prepare a seatbelt webbing. If the heat treatment temperature is lower than 150 ° C., the reaction of the reactive resin mixture on the fiber surface is insufficient and the slipping efficiency is poor, and if it exceeds 180 ° C., the reaction proceeds excessively and the obtained web becomes hard, which is not preferable. .

[0025]

The polyester fiber for seat belt of the present invention does not require dyeing and has a durable slip property only by heat-treating the reactive resin and the smoothing agent adhering to the fiber surface. Therefore, if weaving is performed using this fiber, a woven fabric for a seat belt which does not need to be dyed and processed with resin is obtained, which is of great industrial significance.

[0026]

Next, the present invention will be described in more detail with reference to examples. Each characteristic value in the examples was obtained by the following method.

(1) Sliding efficiency In FIG. 1, 1 is a sash guide, 2 is a weight for weight, 3 is a satin guide pin, and 4 is a woven fabric for a belt. Using a weight of 500 g for weight and a guide pin having a diameter of 8 mm as a satin finish guide pin, the belt fabric is reciprocated at a speed of 300 m / min. Calculate efficiency. Sliding efficiency (%) = (F2 / F1) ^1/2 × 100

(2) Sliding efficiency maintenance rate The weight for weight was changed to 1.0 kg with the apparatus of FIG.
Under an atmosphere of 40 ° C., the belt fabric is woven at a speed of 300 m / min.
A total of 40,000 reciprocating ironing operations are performed each time, and the sash guide is changed each time, and then the sliding efficiency is measured and calculated by the same method as in (1) to obtain a sliding efficiency of 40,000 times. The sliding efficiency maintenance rate is expressed as a percentage obtained by dividing the sliding efficiency value of 40,000 times by the sliding efficiency value of the item (1).

Examples 1-4, Comparative Examples 1-2 A 2.5% by weight master chip containing 20% by weight of carbon black was added to a polyethylene terephthalate chip having an intrinsic viscosity of 0.98, and a spinning temperature of 295 ° C. With 150 holes
From the spinneret of No. 250 and a length of 250
After passing through a heating cylinder having an atmospheric temperature of 430 ° C. and cooling by blowing a cooling air, 0.4% of spinning oil was applied thereto to give 50%.
It is pulled at 0 m / min, stretched between the roller and the heating roller at a stretching ratio of 5.5 to 6.0 times to obtain the target strength, and then run to the slit of 3 mm width guided to the after oil nozzle and arranged. A mixed solution of a reactive resin and a smoothing agent was supplied to the slit while the yarn was in contact with the slit to impart a target amount to the yarn. Using the obtained yarn, a belt woven fabric having 310 warps was woven and subjected to a heat treatment at 170 ° C., and then the sliding efficiency was evaluated. The results are shown in Table 1.

[0030]

[Table 1]

Examples 5 to 7, Comparative Examples 3 to 5
In the above, spinning and drawing were performed in exactly the same manner as in Example 1 except that the composition and the amount of the reactive resin, the amount of the smoothing agent and the amount of the reactive resin were changed as shown in Table 2, and the obtained yarn was used for warp. After weaving 310 belt fabrics and performing a heat treatment at 170 ° C., the sliding efficiency was evaluated. The results are shown in Table 2.

[0032]

[Table 2]

[Brief description of the drawings]

FIG. 1 is an apparatus for measuring a sliding efficiency and a sliding efficiency maintaining rate according to the present invention.

[Description of Signs] 1: Sash guide 2: Weight for weight 3: Nashiji guide pin 4: Fabric for belt

Claims (5)

[Claims] 1. In a polyethylene terephthalate-based soaked fiber containing a colorant having an intrinsic viscosity of 0.8 to 1.0 and a cutting strength of 8.0 g / de or more, a reactive resin and a smoothing agent are coated on the fiber surface. 0.02-0.
2% by weight, and the fabric after weaving and heat-treating the fiber has a sliding efficiency of 50% or more and a sliding efficiency maintaining rate of 8%.
A polyester-dyed fiber for a seat belt, which is 0% or more. 2. The original polyester fiber for seat belt according to claim 1, wherein the reactive resin is a composition containing a urethane resin and a silicon resin. 3. The polyester fiber for seat belt according to claim 1, wherein the reactive resin is a composition containing a urethane resin, a silicone resin and an acrylic resin. 4. The native polyester fiber for a seat belt according to claim 1, wherein the smoothing agent comprises a silicone-based and / or polyetherester-based composition. 5. A polyethylene terephthalate-based unstretched fiber having an intrinsic viscosity of 0.8 to 1.0 and containing a colorant is subjected to a stretching heat treatment so as to have a cutting strength of 8.0 g / de or more, and then has a reactivity. Applying a mixed solution of a resin and a smoothing agent and winding the same, weaving a web for a seat belt using the obtained drawn fibers, and heat-treating the woven fabric at 150 to 180 ° C. Webbing manufacturing method.