KR102544691B1 - Recycled fiber, Composite for vehicle and method for preparing the same - Google Patents

Abstract

The present application relates to regenerated fibers and vehicle materials including the same. The recycled fibers of the present application include recycled PET and are environmentally friendly, while meeting the physical properties of commercially required materials for vehicles.

Description

Recycled fiber, Composite for vehicle and method for preparing the same}

The present invention relates to recycled fibers, vehicle materials and methods for their preparation.

Polyethylene terephthalate (hereinafter referred to as PET) is widely used as a vehicle material. For example, a fabric used for a seat belt or air bag of a vehicle is made from PET yarn.

Meanwhile, developed countries such as Europe are strengthening environmental regulations and mandating the use of recycled materials in automotive products such as seat belts and airbags. Accordingly, a method of recycling waste PET discarded after being used as a container or fiber for manufacturing vehicle parts is being considered.

Therefore, there is a need for a technology that is environmentally friendly, such as using recycled PET, and can solve the concern of physical property degradation due to reuse of waste PET containing impurities.

One object of the present application is to provide environmentally friendly recycled fibers.

Another object of the present application is to provide recycled PET fibers that can have physical properties equivalent to those of products using only virgin PET.

Another object of the present application is to provide a vehicle material comprising recycled PET.

Another object of the present application is to provide a seat belt or air bag for a vehicle including the vehicle material.

The above object and other objects can all be solved by the present application described below.

This application relates to recycled fibers, eco-friendly vehicle materials and their manufacturing methods. The eco-friendly vehicle material includes recycled fibers.

In this regard, the inventors of the present application, even when using recycled fibers containing recycled PET in fabrics for seat belts or airbags of vehicles, the components and viscosity of recycled PET used in the manufacture of fibers. , It was confirmed that a vehicle material having physical properties equivalent to those using raw PET can be provided by appropriately controlling the content and/or process.

In particular, it has been experimentally confirmed that, in the case of manufacturing yarn using recycled PET described below, it can satisfy the physical properties of yarn (fiber) commercially required in the field of vehicle seat belts or airbags. It became. Specifically, the recycled fiber formed to include recycled PET according to the present application may satisfy tensile strength of 5.0 gf/d or more and elongation at break of 10% or more. Tensile strength and elongation at break are measured according to the ASTM D 885 method.

In this application, "recycled polyethyleneterephthalate (PET)" will be used as a meaning encompassing PET resin or recycled PET chips containing the recycled PET resin recycled for the purpose of recycling discarded waste PET that was first used for a specific purpose, such as a container, fiber, tire cord, etc. can Recycled PET may be referred to as r-PET.

In this application, “virgin polyethyleneterephthalate (PET)” is to be distinguished from the recycled PET (or r-PET), and may mean a PET resin that is not recycled or recycled or a PET chip including the same. Raw PET may be referred to as v-PET or normal PET.

In this application, "recycled fiber" may include reclaimed PET, that is, include at least a reclaimed PET component as a PET component forming a fiber (yarn).

In this application, "vehicle material" may mean a fabric that can be used in a product for a vehicle or an article containing such a fabric. Specifically, the fabric may refer to a woven or non-woven fabric used for airbags or seat belts used in vehicles.

In addition, unless otherwise specified, "include" in this application refers to including a certain component (or component) without particular limitation, and is not construed as excluding the addition of other components (or components). don't

Hereinafter, the present invention will be described in more detail.

In one instance with respect to this application, this application is directed to regenerated fibers. The recycled fibers include recycled PET.

The manufacturing method of recycled PET used for forming the regenerated fibers of the present application is not particularly limited. For example, recycled PET may be produced using a physical recycling method or a chemical recycling method known in the art. Specifically, the physical recycling method is a method of recovering PET in the form of chips, flakes, and pellets through crushing and washing, and the chemical recycling method is PET through a chemical reaction. An example is the recovery of raw materials.

The regenerated fiber contains isophthalic acid or a unit derived therefrom in an amount of 0.1 to 2.0 mol %. Specifically, the isophthalic acid or a unit derived therefrom may be included in recycled PET. In the case of melt spinning for yarn formation, melting the PET chip at a temperature higher than the melting point is preceded, and when the crystallinity is high, the melting point temperature is also increased, so the related process temperature must be increased. This increase in process temperature causes problems such as cost increase such as energy increase or equipment improvement, as well as thermal decomposition of PET and consequent deterioration of yarn properties. In addition, in the case of recycled PET, since waste PET can be melted in order to recover recycled PET in the form of chips, etc., when using recycled PET, the problem of thermal decomposition of PET and the resulting degradation of yarn properties is more serious. . In this regard, isophthalic acid included to satisfy the above content range can lower the crystallinity of recycled PET to an appropriate level, and as a result, the above-described problems can be prevented.

In one example, the lower limit of the content of isophthalic acid is 0.3 mol% or more, 0.4 mol% or more, 0.5 mol% or more, 0.6 mol% or more, 0.7 mol% or more, 0.8 mol% or more, 0.9 mol% or more or 1.0 mol % or more, and the upper limit thereof may be 1.8 mol% or less, 1.6 mol% or less, 1.4 mol% or less, 1.2 mol% or less, or 1.0 mol% or less.

In addition, the recycled PET may have an intrinsic viscosity in the range of 0.9 to 2.00 dl/g. As confirmed through the experimental examples below, when the intrinsic viscosity of the regenerated PET is less than 0.9 dl/g, physical properties such as tensile strength and elongation at break are insufficient, and the intrinsic viscosity of the regenerated PET exceeds 2.0 dl/g. In some cases, there is a problem in which spinning and ancestral rites are impossible.

For example, the lower limit of intrinsic viscosity of the recycled PET is 0.90 dl/g or more, 1.00 dl/g or more, 1.1 0 dl/g or more, 1.20 dl/g or more, 1.30 dl/g or more, 1.40 dl/g or more, 1.50 dl /g or more, 1.60 dl/g or more, 1.70 dl/g or more, 1.80 dl/g or more, or 1.90 dl/g or more, the upper limit of which is, for example, 1.90 dl/g or less, 1.80 dl/g or less, 1.70 dl/g or less, 1.60 dl/g or less, 1.50 dl/g or less, 1.40 dl/g or less, 1.30 dl/g or less, 1.20 dl/g or less, 1.10 dl/g or less, or 1.00 dl/g or less.

In one example, the recycled fiber may include 25% to 100% by weight of recycled PET as a PET component. When the recycled PET having the viscosity described above is used within the range, it is advantageous to secure the tensile strength and elongation at break described above.

In one example, when recycled PET is used to form recycled fibers in the above content, that is, in the weight % range, the content of isophthalic acid in the recycled PET can be calculated according to the content of recycled PET used in the recycled fibers. there is. For example, if recycled PET and original PET form recycled fibers at content ratios of 50% by weight and 50% by weight, and the content of isophthalic acid contained in the recycled fibers is 1 mol%, only recycled PET contains isophthalic acid. In this case, it can be said that the content of isophthalic acid actually included in the recycled PET is 2 mol%.

In one example, the recycled fiber may be formed of recycled PET. Specifically, the regenerated fiber may be a fiber manufactured by melt spinning a material including a regenerated PET chip.

In another example, the recycled fiber may further include raw PET. That is, the recycled fiber may include recycled PET and original PET. For example, the regenerated fiber may be a fiber manufactured by melt-spinning regenerated PET and raw PET together. Specifically, the lower limit of the content of the recycled PET component among the melt-spun PET components to produce recycled fibers is, for example, 25% by weight or more, 30% by weight or more, 35% by weight or more, 40% by weight or more, 45% by weight or more. At least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90% or 95 % by weight or more, and the upper limit is, for example, less than 100% by weight, specifically 95% by weight or less, 90% by weight or less, 85% by weight or less, 80% by weight or less, 75% by weight or less, 70% by weight or less , 65 wt% or less, 60 wt% or less, 55 wt% or less, 50 wt% or less, 45 wt% or less, 40 wt% or less, 35 wt% or less, or 30 wt% or less. In addition, the upper limit of the content occupied by the raw PET component among the PET components melt-spun for the manufacture of recycled fibers is, for example, 75% by weight or less, 70% by weight or less, 65% by weight or less, 60% by weight or less, 55% by weight or less. % or less, 50% or less, 45% or less, 40% or less, 35% or less, 30% or less, 25% or less, 20% or less, 15% or less, 10% or less, or 5% or less % or less, and the lower limit is, for example, 5% by weight or more, 10% by weight or more, 15% by weight or more, 20% by weight or more, 25% by weight or more, 30% by weight or more, 35% by weight or more, 40% by weight or more. , 45% or more, 50% or more, 55% or more, 60% or more, 65% or more, or 70% or more.

In one example, the raw PET used with the recycled PET component comprising isophthalic acid may not contain isophthalic acid or units derived therefrom.

In one example, the original PET may have an intrinsic viscosity in the range of 0.70 to 1.30 dl/g. Specifically, the lower limit of the intrinsic viscosity of the original PET is, for example, 0.80 dl/g or more, 0.85 dl/g or more, 0.90 dl/g or more, 0.95 dl/g or more, 1.00 dl/g or more, or 1.05 dl/g or more. . or less, 1.00 dl/g or less, 0.95 dl/g or less, 0.90 dl/g or less, or 0.85 dl/g or less.

In one example, the regenerated fiber is regenerated PET in the range of 1.20 to 2.00 dl/g intrinsic viscosity; and raw PET having an intrinsic viscosity in the range of 0.80 to 1.20 dl/g. Specifically, in the case of recycled PET, it undergoes physical and/or chemical treatment to remove impurities, but the physical properties of the yarn obtained after spinning (eg, strength, breakage, etc.) may deteriorate because there are still more impurities than original PET. . In addition, an additional melting process is also required to manufacture recycled PET in the form of chips, etc., and the thermal decomposition of PET generated in this process is also one cause of deteriorating the physical properties of the yarn. The inventors of the present application, when the intrinsic viscosities of the raw PET and the recycled PET each satisfy the above ranges, despite the cause of the deterioration in the physical properties of the yarn described above, are environmentally friendly and can secure better physical properties than when only the recycled PET is used. Furthermore, it was confirmed that the physical properties of yarns that are commercially required can be sufficiently secured. Specifically, the intrinsic viscosity of the recycled PET is, for example, 1.30 dl/g or more, 1.35 dl/g or more, 1.40 dl/g or more, 1.45 dl/g or more, 1.50 dl/g or more, 1.55 dl/g or more, 1.60 dl/g or more, 1.65 dl/g or more, 1.70 dl/g or more, 1.75 dl/g or more, 1.80 dl/g or more, 1.85 dl/g or more, or 1.90 dl/g or more, the upper limit of which is, for example, , 1.95 dl/g or less, 1.90 dl/g or less, 1.85 dl/g or less, 1.80 dl/g or less, 1.75 dl/g or less, 1.70 dl/g or less, 1.65 dl/g or less, 1.60 dl/g or less, 1.55 dl/g or less, 1.50 dl/g or less, 1.45 dl/g or less, 1.40 dl/g or less or 1.35 dl/g or less.

In one example, the intrinsic viscosity of the recycled PET may be greater than that of the original PET. Since the viscosity and molecular weight are generally proportional, the higher the viscosity of the recycled PET, the higher the molecular weight, so improved physical properties can be expected. The inventors of the present application, even if there are factors that deteriorate the physical properties of recycled PET, such as impurities or thermal decomposition during remelting, if the viscosity of recycled PET is higher than that of original PET, the physical properties of the yarn commercially required in relation to vehicle materials are It was confirmed that it can be sufficiently secured.

In one example, the recycled fiber comprises 30% to 60% by weight of recycled PET having an intrinsic viscosity in the range of 1.20 to 2.00 dl/g; and 40 to 70% by weight of raw PET having an intrinsic viscosity in the range of 0.80 to 1.20 dl/g. The inventors of the present application, when the intrinsic viscosity and content of raw PET and recycled PET used in the manufacture of recycled fiber satisfy the above numerical range, despite factors that deteriorate the physical properties of recycled PET such as impurities or thermal decomposition during remelting And, it was confirmed that the commercially required physical properties can be sufficiently secured. At this time, the intrinsic viscosity of the recycled PET is, for example, 1.30 dl/g or more, 1.35 dl/g or more, 1.40 dl/g or more, 1.45 dl/g or more, 1.50 dl/g or more, 1.55 dl/g or more, 1.60 dl / g or more, 1.65 dl / g or more, 1.70 dl / g or more, 1.75 dl / g or more, 1.80 dl / g or more, 1.85 dl / g or more, or 1.90 dl / g or more, the upper limit of which is, for example, 1.95 dl/g or less, 1.90 dl/g or less, 1.85 dl/g or less, 1.80 dl/g or less, 1.75 dl/g or less, 1.70 dl/g or less, 1.65 dl/g or less, 1.60 dl/g or less, 1.55 dl /g or less, 1.50 dl/g or less, 1.45 dl/g or less, 1.40 dl/g or less, or 1.35 dl/g or less. In addition, the content of the recycled PET may be, for example, 30% by weight or more, 35% by weight or more, 40% by weight or more, 45% by weight or more, 50% by weight or more, or 55% by weight or more, and the upper limit thereof Silver may be 55% or less, 50% or less, 45% or less, 40% or less, or 35% or less by weight.

The regenerated fiber may have a predetermined value of fineness at a level that satisfies the above-described commercially required physical properties of yarn (fiber). For example, the single yarn fineness of the regenerated fiber may be in the range of 2 to 15 denier. In addition, the regenerated fiber may have a total fineness ranging from 400 to 2,000 denier. Although not particularly limited, the single yarn fineness can be measured by taking a yarn with a length of 9,000 m using a bobbin, weighing the yarn, obtaining the total fineness of the yarn, and then dividing it by the number of filaments.

When the components, content and/or viscosity of regenerated PET and the content and/or viscosity of v-PET are adjusted, the tensile strength and elongation at break of the regenerated fiber can be more precisely controlled.

In one example, the lower limit of the tensile strength of the regenerated fiber is, for example, 5.5 gf/d or more, 6.0 gf/d or more, 6.5 gf/d or more, 7.0 gf/d or more, 7.5 gf/d or more, 8.0 gf /d or more, 8.5 gf/d or more, 9.0 gf/d or more, 9.5 gf/d or more, or 10.0 gf/d or more. In addition, the upper limit of the tensile strength of the regenerated fiber is not particularly limited, but, for example, 15.0 gf/d or less, 14.5 gf/d or less, 14.0 gf/d or less, 13.5 gf/d or less, 13.0 gf/d or less, 12.5 gf/d or less, 12.0 gf/d or less, 11.5 gf/d or less, 11.0 gf/d or less, 10.5 gf/d or less, or 10.0 gf/d or less.

In one example, the lower limit of the elongation at break of the regenerated fiber is, for example, 10.5% or more, 11.0% or more, 11.5% or more, 12.0% or more, 12.5% or more, 13.0% or more, 13.5% or more, 14.0% or more, 14.5% or more, 15.0% or more, 15.5% or more, 16.0% or more, 16.5% or more, 17.0% or more, 17.5% or more, 18.0% or more, 18.5% or more, 19.0% or more, 19.5% or more, or 20.0% or more. In addition, the upper limit of the regenerated fiber break elongation is not particularly limited, but is, for example, 25.0% or less, 24.5% or less, 24.0% or less, 23.5% or less, 23.0% or less, 22.5% or less, 22.0% or less, 21.5% or less. , 21.0% or less, 20.5% or less, 20.0% or less, 19.5% or less, or 19.0% or less.

In another aspect of the present application, the present application is directed to a method of making regenerated fibers.

The method includes melt spinning a material comprising recycled PET having an intrinsic viscosity in the range of 0.90 to 2.00 dl/g and containing isophthalic acid in a content range of 0.1 to 2.0 mol %. Melt spinning produces unstretched yarn.

The form of recycled PET included in the material is not particularly limited. For example, it may be in the form of a chip.

The properties or content related to the recycled PET are as described above.

In one example, the material may further include raw PET. Specifically, the method comprises: recycled PET containing isophthalic acid in a content range of 0.1 to 2.0 mol% and having an intrinsic viscosity in the range of 0.90 to 2.00 dl/g; and melt spinning a material comprising raw PET.

The shape of raw PET included in the material is not particularly limited. For example, it may be in the form of a chip.

The characteristics and contents related to the raw PET are as described above.

In one example, the melting temperature for the material may be 250 °C or higher. Specifically, the melting temperature may have a lower limit of, for example, 260 °C or higher, 270 °C or higher, 280 °C or higher, 290 °C or higher, or 300 °C or higher, and an upper limit thereof, for example, 315 °C or lower, 310 °C or lower. , 300 °C or less, 290 °C or less, or 280 °C or less. When melting is made within the above range, sufficient melting and excellent spinnability can be secured, and excessive thermal decomposition of PET can be prevented.

In one example, the spinning may be made in a speed range of about 250 to 4,000 m/min.

In the case of a spinneret used during melt spinning, one appropriately designed at a level capable of obtaining desired properties of regenerated fibers may be used. Although not particularly limited, a spinneret designed so that the single yarn fineness of the regenerated fiber may be in the range of 2 to 15 denier may be used.

In one example, cooling may be performed on melt spun PET. The cooling method is not particularly limited. For example, cooling may be achieved using wind at a temperature of 15 to 60 °C.

In one example, a drawing process may be performed on the polyester undrawn yarn. Equipment including a plurality of rollers may be used for the stretching, but the equipment used is not particularly limited.

In one example, the stretching may be performed at a level in which the total stretching ratio is in the range of about 4.5 to 6.0. That is, the method may further include a drawing step of drawing the undrawn yarn manufactured after melt spinning so that the total draw ratio satisfies the range of 4.5 to 6.0. When the total draw ratio exceeds 6.0, there are problems such as trimming due to over-stretching. In addition, when the total draw ratio is less than 4.5, the degree of orientation of the fibers is low, and thus the strength of the yarn may be lowered.

After the stretching, heat setting, relaxation, and winding processes may be additionally performed. These processes can be suitably carried out using known equipment.

In one example, the relaxation rate may be adjusted in the range of 1 to 3%. That is, the method may further include a relaxation step having a relaxation rate of 1 to 3% after the stretching. If the relaxation rate is less than 1%, the yarn may be cut off because tension is applied too high, and if it exceeds 3%, airtightness or durability may not be good.

The specific characteristics or configuration of the regenerated fibers produced through the above method are the same as those described above.

In another example related to the present application, the present application relates to an eco-friendly vehicle material including regenerated fibers.

The specific characteristics or composition of the regenerated fibers used in the eco-friendly vehicle material are the same as those described above.

The eco-friendly vehicle material may be, for example, a fabric used for a vehicle airbag or seat belt.

In one example, the fabric may be manufactured through beaming, weaving, scouring, and tentering processes using the above-described regenerated fiber yarn as weft and warp. The fabric can be manufactured using a conventional weaving machine, and is not limited to using any specific loom. However, plain weave fabric can be manufactured using a rapier loom, air jet loom, or water jet loom, and OPW fabric can be manufactured using a jacquard loom. Loom) can be used.

In one example, a fabric for an airbag may be a plain weave having a fabric density of 40 x 40 to 55 x 55 per inch in warp and weft directions. When the above range is satisfied, it is advantageous to satisfy airtightness and strength required for an airbag.

In one example, the airbag fabric may have a stiffness of 25 N or less measured according to ASTM D 4032. When the stiffness exceeds the above range, the airbag cushion has poor folding and storage properties because the fabric for the airbag is stiff. In addition, when an impact is applied and the airbag inflates, a user's body may be injured.

In one example, the fabric for the seat belt may be manufactured with a weaving density of 280 patterns/inch or less in consideration of weight or comfort. Specifically, the warp density may be 230 to 280 yarns/inch, or preferably 240 to 270 yarns/inch. If it is 230 bone/inch or more, it is advantageous to safely support passengers in case of a vehicle collision. In addition, considering driveability when attaching and detaching the seat belt, the weft density of the fabric for the seat belt may be, for example, 4 yarns/inch or more. In addition, in order to prevent an excessive increase in the thickness of the seat belt and take into consideration comfort of passengers, the upper limit of the weft density of the seat belt fabric may be, for example, 8 yarns/inch or less.

In one example, the fabric for a seat belt may satisfy level 3 or 4 in friction fastness measured according to KS K 0650-1. Therefore, the fabric for a seat belt of the present application has an excellent property of preventing dye from escaping even when friction with a user's clothing occurs.

According to one embodiment of the present invention, since it is manufactured using recycled PET, it is possible to provide recycled fibers that are environmentally friendly and satisfy the physical properties of yarns (fibers) required commercially. In addition, these recycled fibers can be used as fabrics for seat belts or airbags in vehicles.

Hereinafter, the action and effect of the invention will be described in more detail through specific examples of the invention. However, the examples are only examples of the invention, and thereby the scope of the invention is not limited in any sense.

Examples and Comparative Examples

Example 1

As shown in Table 1, after melt-spinning an r-PET chip containing 1.5 mol% of IPA and having an intrinsic viscosity of 1.0 dl/g and then cooling, polyester unstretched yarn is prepared, and then through drawing and relaxation processes. A polyester yarn, that is, a recycled fiber (single yarn fineness of about 7 denier) was prepared. At this time, the spinning temperature for the melt spinning process was adjusted to about 290° C., the total draw ratio to about 5.0, and the relaxation rate to about 1.5%.

Examples 2 to 12 and Comparative Examples 1 to 3

As in Table 1 or Table 2, the components, content and/or viscosity of r-PET, and content and/or viscosity of v-PET were adjusted. In addition, as in Example 1, after preparing polyester undrawn yarn by melt-spinning and cooling the r-PET chip and/or v-PET chip, the undrawn yarn is drawn at the same draw ratio and heat treated to produce polyester A yarn, i.e., a recycled fiber, was produced.

The composition of the yarn used in Examples and Comparative Examples is shown in Tables 1 and 2, respectively.

metrics

1. IPA (isophthalic acid) content in regenerated fibers

Samples were prepared by dissolving the PET fibers prepared in Examples and Comparative Examples in a solvent of Trifluoroacetic Acid-d (System Peak: 11.50) at a concentration of 2 to 3%, and IPA in the sample using Oxford AS400 (64MHz) equipment. The content of was measured.

(1) IPA Peak : (a) 8.7~8.8ppm, (b) 8.2~8.3ppm, (c) 7.5~7.6ppm

(2) IPA content measurement method

64 MHz H-NMR was measured using the prepared sample, and calculated using Equation 1 below.

<Equation 1>

IPA content (mol%) = (area a + area b + area c) X 100 (%) / total area

2. Intrinsic viscosity of r-PTE and v-PET

Intrinsic viscosities of the r-PTE chip and the v-PET chip were respectively measured. Specifically, after extracting the emulsion from the sample using carbon tetrachloride, melting it with OCP (Ortho Chloro Phenol) at 160 ± 2 ° C, using an automatic viscosity meter (Skyvis-4000) at 25 ° C, the sample in the viscometer Viscosity was measured. And the intrinsic viscosity (I.V.) was obtained according to the calculation of the following process.

Intrinsic viscosity (I.V.) = {(0.0242 X Rel)+0.2634} X F

Rel = solution seconds X solution specific gravity X viscosity coefficient / OCP viscosity

F = (I.V. of standard chip) / (average I.V. of 3 measurements of standard chip with standard copper length)

3. Tensile strength of yarn (unit: gf/d) and elongation at break (unit: %)

Tensile strength and elongation at break were measured according to ASTM D 885 standard.

4. Friction fastness

(1) Manufacture of seat-belt fabric

The fiber yarns prepared in Examples and Comparative Examples were woven into 270 yarns to prepare a seat belt semi-finished product having a weft density of 7.1 yarns/inch, a warp density of 270 yarns/inch, and a width of 49 mm. Then, the seat belt sample was dyed using S-Type black disperse dye. Friction fastness was measured for the dyed samples. Through this, it is possible to check the extent to which the dye is separated by friction with the clothes.

(2) Friction fastness of fabric

Friction fastness was measured according to KS K 0650-1 (crochmeter method). The specific measurement process is as follows.

1) Scope of application: application of dyes

2) Amount of requested sample: 20 cm x 20 cm

3) Test piece

-Fabric: 2 rectangles measuring 20 cm x 10 cm

-Thread: Knitted to form a rectangle measuring 20 cm x 10 cm or prepared by winding it lengthwise on thick paper

4) Test method

- Leave the test piece and white cotton cloth for dry rubbing for 4 hours in the standard condition

- Wet cotton cloth for wet friction test is prepared in about 100% wet state by soaking white cotton cloth for dry friction with distilled water at room temperature before the test.

- After tightly wrapping the rubricor with a load of 900 g in dry and wet white cotton cloth, respectively, rubbing between 10 cm on the test piece for 10 seconds and 10 reciprocating strokes. At this time, it is a rule to test the surface, and in the case of fabrics made of various colors, all colors are arranged in one direction of the test piece (if the color area is large enough to rub, the test piece is divided into each color and the test is conducted)

5) Check result

Compare with the standard gray color table for contamination of the test piece and record water supply after judgment (wet water supply)

5. Stiffness (Unit: N)

(1) Manufacture of fabric for airbags

After weaving a plain weave fabric with a fabric density of 46 x 46 per inch in the warp and weft directions, the stiffness was measured.

(2) Measurement of stiffness

The stiffness of the fabric was measured by the Circular Bend method using a stiffness measuring device according to ASTM D 4032 of the American Society for Testing and Materials. Through the degree of stiffness, the degree of flexibility of airbag fabrics can be compared.

The results measured for Examples and Comparative Examples are shown in Tables 1 and 2, respectively.

Example v-PET
the viscosity of
(dl/g) Viscosity of r-PET
(dl/g) PET content
(weight%)
(v-PET
:
r-PET)
in r-PET
Content of IPA (mol%) tensile strength
(gf/d) cut god
(%) Seat-belt related friction fastness
(wet water supply) Airbag-related stiffness (N) One 1.0±0.2 1.0 0:100 1.5 5.1 10.3 3 24 2 1.0±0.2 1.0 50:50 0.8 5.5 11.2 3 23 3 1.0±0.2 1.0 70:30 0.4 5.8 12.4 3 23 4 1.0±0.2 1.3 0:100 1.5 6.2 13.1 4 20 5 1.0±0.2 1.3 50:50 0.8 6.6 13.8 4 22 6 1.0±0.2 1.3 70:30 0.4 6.9 14.2 4 23 7 1.0±0.2 1.6 0:100 1.5 7.3 14.5 4 18 8 1.0±0.2 1.6 50:50 0.8 7.8 15.3 4 20 9 1.0±0.2 1.6 70:30 0.4 8.2 15.8 4 21 10 1.0±0.2 1.9 0:100 1.5 8.6 16.4 4 15 11 1.0±0.2 1.9 50:50 0.8 8.9 17.0 4 17 12 1.0±0.2 1.9 70:30 0.4 9.2 17.8 4 17

comparative example v-PET
the viscosity of Viscosity of r-PET PET content
(weight%)
(v-PET
:
r-PET)
in r-PET
Content of IPA (mol%) tensile strength
(gf/d) cut god
(%) Seat-belt related friction fastness
(wet water supply) Airbag-related stiffness (N) One 1.0±0.2 0.7 0:100 1.5 4.8 9.4 2 26 2 1.0±0.2 2.2 0:100 1.5 Emission not possible (measurement not possible) not radiated
(not measurable) - - 3 1.0±0.2 2.5 70:30 0.4 Emission not possible (measurement not possible) not radiated
(not measurable) - -

Claims (16)

30% to 60% by weight of recycled PET having an intrinsic viscosity in the range of 1.20 to 2.00 dl/g; and 40 to 70% by weight of raw PET having an intrinsic viscosity in the range of 0.80 to 1.20 dl/g;
wherein the recycled PET comprises isophthalic acid in an amount ranging from 0.1 to 2.0 mole percent. delete The regenerated fiber according to claim 1, wherein the regenerated fiber has a tensile strength of 5.0 gf/d or more and an elongation at break of 10% or more. delete delete delete delete delete 30% to 60% by weight of recycled PET comprising isophthalic acid in an amount ranging from 0.1 to 2.0 mol% and having an intrinsic viscosity ranging from 1.20 to 2.00 dl/g; and melt-spinning a material comprising 40 to 70% by weight of raw PET having an intrinsic viscosity in the range of 0.80 to 1.20 dl/g. delete The method according to claim 9, wherein the melting temperature in the melt spinning is 250 ° C. or higher. 10. The method of claim 9, further comprising a drawing step of drawing the unstretched yarn produced after the melt spinning so that the total draw ratio satisfies the range of 4.5 to 6.0. 13. The method of claim 12, further comprising a relaxation step of a relaxation rate in the range of 1 to 3% after the drawing. delete It is a fabric for airbags, which is an eco-friendly vehicle material containing regenerated fibers,
The regenerated fiber comprises 30% to 60% by weight of recycled PET having an intrinsic viscosity in the range of 1.20 to 2.00 dl/g; and 40 to 70% by weight of raw PET having an intrinsic viscosity in the range of 0.80 to 1.20 dl/g;
wherein the recycled PET comprises isophthalic acid in an amount ranging from 0.1 to 2.0 mol%;
The fabric for the airbag is a plain weave having a fabric density of 40 x 40 to 55 x 55 per inch,
A fabric for an airbag having a stiffness of 25 N or less, measured according to ASTM D 4032. It is a fabric for seat belts, which is an eco-friendly vehicle material containing regenerated fibers,
The regenerated fiber comprises 30% to 60% by weight of recycled PET having an intrinsic viscosity in the range of 1.20 to 2.00 dl/g; and 40 to 70% by weight of raw PET having an intrinsic viscosity in the range of 0.80 to 1.20 dl/g;
wherein the recycled PET comprises isophthalic acid in an amount ranging from 0.1 to 2.0 mol%;
The seat belt fabric has a warp density of 230 to 280 yarns/inch and a weft density of 4 to 8 yarns/inch,
Fabric for seat belts whose friction fastness measured according to KS K 0650-1 satisfies level 3 or 4.