JP2016060992A - Knitted fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knitted fabric capable of suppressing deterioration of light fastness while having excellent flame retardancy and excellent fogging grade.SOLUTION: A knitted fabric comprises front yarns and back yarns and both the front yarns and the back yarns include flame retardant yarns. The content of the flame retardant yarns included in the front yarns is 0 to 5 mass% based on 100 mass% of the knitted fabric and the content of the flame retardant yarns included in the back yarns is 10 to 35 mass% based on 100 mass% of the knitted fabric. The knitted fabric has a burning rate of 100 mm/minute in the burning test method in accordance with FMVSS-302.SELECTED DRAWING: None

Description

  The present invention relates to a knitted fabric.

  Polyester is excellent in mechanical strength, chemical stability, transparency, and the like, and is inexpensive. Therefore, polyester is one of the most indispensable materials for human life in the world. Among them, polyethylene terephthalate (hereinafter sometimes abbreviated as polyethylene terephthalate) is excellent in terms of versatility and practicality, and is suitably used as a fiber material.

  A knitted fabric having a front yarn and a back yarn, in which both the front yarn and the back yarn are polyethylene terephthalate fibers, is suitably used for automobile interior materials. In addition, automobile interior materials and the like are required to have excellent flame retardancy, and the front yarn and the back yarn described above are used to suppress the degree of fogging (glass fogging) while improving the flame retardance of the knitted fabric. A flame retardant knitted fabric using a flame retardant polyester fiber containing a flame retardant is also known (for example, see Patent Document 1).

JP 2005-42269 A

  The knitted fabric disclosed in Patent Document 1 uses a large amount of flame retardant polyester fiber containing a flame retardant in the front yarn as described above. Further, for example, when the knitted fabric is an automobile interior material, the surface of the knitted fabric on the side where the front yarn is arranged is a surface exposed to sunlight. Here, although the flame retardant yarn contains a flame retardant, this causes a phenomenon that the fixing area of the dye to the inside of the flame retardant yarn is narrowed, and from this, the surface on which the front yarn of the knitted fabric is arranged Is exposed to sunlight, the color difference between the dye-fixed area and the non-fixed area of the flame retardant yarn becomes remarkable, resulting in a problem that the light fastness of the knitted fabric is lowered.

  Therefore, in view of the above problems, the present invention provides a knitted fabric that can suppress a decrease in light fastness when used for an automobile interior material or the like, and has excellent flame retardancy and fogging degree. Let it be an issue.

The present invention employs the following means in order to solve the above problems.
(1) It has a front yarn and a back yarn, the front yarn and the back yarn include a flame retardant yarn, and the content of the flame retardant yarn contained in the front yarn is 0 to 5% by mass with respect to 100% by mass of the knitted fabric. The content of the flame retardant yarn contained in the back yarn is 10 to 35% by mass with respect to 100% by mass of the knitted fabric, and the combustion rate in the combustion test method defined in the FMVSS-302 method is 100 mm / min or less. Knitted fabric,
(2) The knitted fabric according to (1), wherein the content of the flame retardant yarn contained in the back yarn is 15 to 30% by mass with respect to 100% by mass of the knitted fabric.
(3) In the above (1) or (2), the back yarn has a flame retardant yarn and a non-flame retardant yarn, and the flame retardant yarn and the non-flame retardant yarn are alternately arranged in all or part of the back yarn. Knitted fabric,
(4) The knitted fabric according to any one of (1) to (3), wherein at least one surface has a static friction coefficient of 0.9 or more,
(5) The knitted fabric according to any one of (1) to (4), wherein at least one surface is subjected to raising treatment,
(6) The knitted fabric according to any one of (1) to (5), wherein the basis weight is 100 to 500 g / m ² .

  According to the present invention, by suitably using and arranging a flame retardant yarn for the front yarn and / or the back yarn, it is possible to suppress a decrease in light fastness when used for automobile interior materials and the like, and an excellent flame retardant A knitted fabric having a sexiness and a degree of fogging can be provided.

  The knitted fabric of the present invention includes a front yarn and a back yarn, the front yarn and the back yarn include a flame retardant yarn and a non-flame retardant yarn, and the content of the flame retardant yarn contained in the front yarn is 100% by mass of the knitted fabric. In the combustion test method defined in the FMVSS-302 method, the content of the flame retardant yarn contained in the back yarn is 10 to 35% by mass with respect to 100% by mass of the knitted fabric. The burning rate is 100 mm / min or less.

  First, the non-flame retardant yarn included in the knitted fabric of the present invention will be described. Here, the non-flame retardant yarn refers to a fiber that does not contain a flame retardant described later, or a fiber that has an extremely small influence on the reduction in light fastness even if it contains a flame retardant described later. Specifically, in accordance with JIS K7201-2 (2007), an oxygen index (LOI) value measured by an oxygen index flammability tester ON-1 type (manufactured by Suga Test Instruments Co., Ltd.) is less than 26. Say. Further, the LOI value of the non-flame retardant yarn can be set within a desired range by adjusting the type of the flame retardant used and the content of the flame retardant with respect to the entire non-flame retardant yarn.

  Next, as the material of the non-flame retardant yarn used for the knitted fabric of the present invention, synthetic fiber such as polyester fiber or polyamide fiber represented by polyethylene terephthalate, polytrimethylene terephthalate, natural fiber such as cotton, rayon, etc. Any fiber material can be used. From the viewpoint of excellent durability such as light resistance, polyester fibers are preferred. From the viewpoint of excellent productivity and dimensional stability, polyethylene terephthalate fibers are more preferable. From the viewpoint of reducing the amount of petroleum resources used and suppressing the emission of greenhouse gases, more preferred is polyethylene terephthalate composed of ethylene glycol derived from biomass resources and terephthalic acid derived from fossil resources and / or ester-forming derivatives thereof.

  When the non-flame retardant yarn used in the present invention is a synthetic fiber, the synthetic resin composition contained in the synthetic fiber is an antioxidant, an ultraviolet ray, an absorbent, a flame retardant, a fluorescent whitening agent, as long as the effects of the invention are not impaired. Matting agents, plasticizers or antifoaming agents, or other additives may be blended.

  When the non-flame retardant yarn used in the present invention is a polyethylene terephthalate fiber, the polyethylene terephthalate is composed mainly of ethylene glycol and terephthalic acid, and other monomers can be used as long as the physical properties of the obtained polyethylene terephthalate are not impaired. The components can be copolymerized. In that case, it is preferable that the repeating unit of ethylene terephthalate is 80 mol% or more. Examples of the copolymerizable acid component include aromatic dicarboxylic acids, aliphatic dicarboxylic acids, alicyclic dicarboxylic acids, and hydroxycarboxylic acids. Specific examples of the aromatic dicarboxylic acid include phthalic acid, isophthalic acid, and 5-sulfoisophthalic acid. Examples of the aliphatic dicarboxylic acid include oxalic acid, adipic acid, succinic acid, suberic acid, sebacic acid, and dodecane. Examples of the alicyclic dicarboxylic acid include cyclohexanedicarboxylic acid, and examples of the hydroxycarboxylic acid include glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxycaproic acid, hydroxypentanoic acid, hydroxyheptanoic acid or And hydroxyoctanoic acid. Examples of the copolymerizable alcohol component include diethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, 1,4-cyclohexanedimethanol or ethylene oxide adduct of bisphenol A. Examples thereof include dihydric alcohols and polyhydric alcohols such as pentaerythritol.

  When the non-flame retardant yarn used in the present invention is a polyethylene terephthalate fiber, the polyethylene terephthalate preferably has an intrinsic viscosity of 0.50 or more, more preferably 0.60 or more. By setting the intrinsic viscosity to 0.5 or more, the strength of the polyethylene terephthalate fiber can be improved. Further, the upper limit of the intrinsic viscosity of polyethylene terephthalate is not particularly specified, but it is preferable to set the upper limit to 1.2 in consideration of equipment capacity and productivity when industrially implemented.

When the non-flame retardant yarn used in the present invention is polyethylene terephthalate fiber and the polyethylene terephthalate contained in the polyethylene terephthalate fiber is composed of biomass-derived ethylene glycol and fossil resource-derived terephthalic acid and / or ester-forming derivatives thereof, The ratio of carbon atoms derived from biomass resources (measured bio-ization rate) obtained based on the concentration of radioactive carbon ( ¹⁴ C) in circulating carbon in the 1950s relative to all carbon atoms in the polymer constituting the ground is 10.0. % Or more is preferable. Polyethylene terephthalate obtained by setting the measured bio-ization rate to 10.0% or more has excellent effects in terms of reducing the use of petroleum resources and suppressing the emission of greenhouse gases. From the viewpoint of reducing the environmental load, the above substantial biotinylation rate is preferably 13% or more, and more preferably 15% or more.

  In addition, as a method for producing polyethylene terephthalate used in one aspect of the knitted fabric of the present invention, after being molded into a chip shape, in order to further increase the degree of polymerization, or to reduce oligomers and impurities, if necessary, Solid phase polymerization may be performed. As a method of solid phase polymerization, for example, a polyethylene terephthalate chip is preliminarily dried by heating at a temperature of 150 to 180 ° C. for 1 to 10 hours, and then at a temperature of 190 to 235 ° C., preferably 200 to 230 ° C. It is carried out by heating in an active gas atmosphere or under reduced pressure, preferably for 1 to 30 hours, more preferably for 5 to 20 hours.

  Next, the manufacturing method of the polyethylene terephthalate fiber used in the one aspect | mode of the knitted fabric of this invention is demonstrated. As a method for obtaining polyethylene terephthalate fiber from polyethylene terephthalate obtained by the above production method, a melt spinning method can be applied. Specifically, polyethylene terephthalate heated to a melting point or higher in a heating cylinder is extruded from a spinneret, the extruded yarn is cooled and stretched, and cut or wound as it is to obtain polyethylene terephthalate fiber. Can do. The temperature in the heating cylinder is preferably 280 ° C. to 330 ° C. from the viewpoint of improving the yarn production.

  The non-flame retardant yarn used in the present invention may have a round or irregular cross section, or may be a hollow fiber or a solid fiber.

  Further, the single fiber fineness of the non-flame retardant yarn used in the present invention is preferably 0.1 dtex or more and 10 dtex or less, more preferably 0.4 dtex or more for the upper limit and 7 dtex or less for the lower limit.

  The total fineness of the non-flame retardant yarn used in the present invention is preferably in the range of 50 to 300 dtex. By setting the total fineness to 50 dtex or more, the mechanical strength such as tensile strength and tear strength of the non-flame retardant yarn is improved, and it is possible to suppress breakage and the like when applied to a knitted fabric for automobile interior materials. Moreover, when the total fineness is 300 dtex or less, the texture of the fabric becomes good when applied to a knitted fabric for automobile interior materials, and the reduction in elongation and the like are improved. More preferably, the lower limit is 100 dtex or more, and the upper limit is 200 dtex or less. A smooth touch can be maintained by making the total fineness more preferable.

  The non-flame retardant yarn used in the present invention may be fibers of various forms such as false twisted yarn, strong twisted yarn, and taslan processed yarn. The form of the non-flame retardant yarn may be multifilament or spun yarn.

  Next, the flame retardant yarn included in the knitted fabric of the present invention will be described. Here, the flame retardant yarn is a synthetic fiber in which a flame retardant is copolymerized with a synthetic resin contained in a synthetic resin composition included in the flame retardant yarn, or the above-mentioned synthetic resin composition has a flame retardant. This is what is blended. Specifically, according to JIS K7201-2 (2007), an oxygen index (LOI) value measured by an oxygen index flammability tester ON-1 type (manufactured by Suga Test Instruments Co., Ltd.) is 26 or more. Say. In addition, from the viewpoint that the flame retardancy of the knitted fabric can be further improved, the LOI value of the flame retardant yarn used in the present invention is preferably 35 or more, and more preferably 40 or more. Further, the LOI value of the flame retardant yarn can be set within a desired range by adjusting the type of the flame retardant used, the content of the flame retardant with respect to the entire flame retardant yarn, and the like.

  Examples of the flame retardant to be copolymerized with the synthetic resin include phosphoric acid esters, phosphorous compounds such as phosphonic acids such as ethylenedimethylphosphinic acid and benzenephosphonic acid derivatives, and brominated bisphenols. Examples of the flame retardant blended in the synthetic resin composition include polybrominated benzene and derivatives thereof, phosphoric acid, phosphorous acid esters, phosphine derivatives, and the like. From the viewpoint that stable flame retardancy is obtained, it is preferable to copolymerize a flame retardant with a synthetic resin, and as a flame retardant used in that case, excellent flame retardancy can be imparted to the knitted fabric, Phosphorus compounds are preferred from the standpoint of good threading properties and generation of toxic gases during combustion, and 2-carboxyethyl (phenyl) from the viewpoint of ease of handling among the phosphorous compounds. Phosphinic acid is more preferred.

  Next, examples of the synthetic resin used for the flame retardant yarn used in the present invention include polyester resins and polyamide resins represented by polyethylene terephthalate, polytrimethylene terephthalate, and the like. Of these, polyester resins are preferable and polyethylene terephthalate is more preferable from the viewpoints of dimensional stability and light resistance.

  Next, the knitted fabric used in the present invention will be described. The type of knitted fabric may be a warp knitted fabric or a weft knitted fabric. Examples of the warp knitting structure include tricot knitting, Russell knitting, jacquard knitting and the like, and preferred examples of the weft knitting fabric include flat knitting, rubber knitting, double-sided knitting, pearl knitting, tuck knitting, and the like. It is not limited. The knitting can be knitted by a normal method using a normal knitting machine such as a circular knitting machine, a flat knitting machine, a tricot knitting machine, and a Raschel knitting machine. The number of layers is not particularly limited and may be a single layer or a knitted fabric having a multilayer structure of two or more layers.

  The knitted fabric of the present invention has a front yarn and a back yarn. By setting it as such a structure, the mechanical strength of a knitted fabric can be improved and such a knitted fabric can be used suitably for a motor vehicle interior material etc.

  The front yarn includes a flame retardant yarn, and the content of the flame retardant yarn in the front yarn is 0 to 5% by mass with respect to 100% by mass of the knitted fabric. On the other hand, the back yarn includes a flame retardant yarn, and the content of the flame retardant yarn in the back yarn is 10 to 35% by mass with respect to 100% by mass of the knitted fabric. Here, in the knitted fabric of the present invention, the amount of the flame retardant yarn contained in the front yarn and the back yarn is in the above range, thereby suppressing the decrease in light fastness of the knitted fabric, A knitted fabric exhibiting excellent flame retardancy can be obtained in applications requiring flame retardancy such as automobile interior materials. That is, when the content of the flame retardant yarn contained in the front yarn exceeds 5% by mass with respect to 100% by mass of the knitted fabric, the light fastness of the knitted fabric is significantly reduced. This is because when the flame retardant yarn holds the flame retardant in the above-described manner, the dye fixing region inside the flame retardant yarn is narrowed, so that the difference from the unfixed region with the dye leads to fading when exposed to sunlight. This is probably because of this. Further, if the content of the flame retardant yarn contained in the front yarn exceeds 5% by mass with respect to 100% by mass of the knitted fabric, when the knitted fabric of the present invention is used as an automotive interior material, When the surface to be touched is raised, the strength and light fastness are inferior. On the other hand, when the content of the flame retardant yarn contained in the back yarn is less than 10% by mass with respect to 100% by mass of the knitted fabric, the flame retardant sufficient as the automotive interior material when the knitted fabric according to the present invention is used as the automotive interior material. Performance cannot be obtained. Further, if the content of the flame retardant yarn contained in the back yarn exceeds 35% by mass with respect to 100% by mass of the knitted fabric, the formability due to the decrease in the strength and elongation of the knitted fabric is deteriorated, which is suitable for the knitted fabric for automobile interior materials. It will not be. In addition, when the strong elongation of the knitted fabric is reduced, the stress at the time of 5% elongation of the knitted fabric increases in both the vertical direction and the horizontal direction. From the above viewpoint, the lower limit of the content of the flame retardant yarn contained in the back yarn is preferably 15% by mass or more with respect to 100% by mass of the knitted fabric, and the upper limit is 30% by mass or less with respect to 100% by mass of the knitted fabric. preferable. Regarding the arrangement of the flame retardant yarn and the non-flame retardant yarn in the back yarn, it is preferable that one or more flame retardant yarns and non-flame retardant yarns are alternately arranged in all or part of the back yarn. By alternating one, it becomes the arrangement | positioning by which a flame-retardant yarn is disperse | distributed, and while obtaining the outstanding flame-retardant performance efficiently, productivity also improves. In addition, since it can exhibit excellent flame retardancy with a small amount of flame retardant yarn, the content ratio of non-flame retardant yarn in the entire knitted fabric can also be improved. The rate will be higher and the environment will be better.

The knitted fabric of the present invention is preferably subjected to surface raising treatment on at least one side. The raised knitted fabric includes a ground tissue and a raised tissue having a raised pile formed on one surface thereof. When the surface on the front yarn side is raised, a good hand feeling can be obtained and the design can be improved when an automobile interior material or the like is used. Examples of the raising method include, but are not particularly limited to, a needle cloth raising or an emery raising with sandpaper. Moreover, when emery raising is employ | adopted for the raising method, Preferably it is preferable to pass a shearing process after raising. By passing through the shearing step, the fibers (fluff) that have been raked on the surface are trimmed, and a better feel and a high design can be obtained. In the case of loop pile by raising a needle cloth, preferably, when the ratio of the number of raised piles at which the angle of the scraped loop pile is 60 to 90 degrees is 100% of the total number of raised piles in the knitted fabric The lower limit is preferably 5% or more, more preferably 10% or more, while the upper limit is preferably 30% or less, more preferably 25% or less. By setting it as 5% or more, it is possible to suppress a decrease in the static friction coefficient and a decrease in the feeling of touch. By setting it to 30% or less, it is possible to suppress deterioration in appearance quality due to generation of pills. In the case of automobile interior materials and chair upholstery, urethane foam is generally bonded to the back of the fabric. Further, in one aspect of the knitted fabric of the present invention, the surface on the back yarn (back) side may be raised as long as the effects of the invention are not impaired. The friction resistance between the urethane foam and the raised surface is increased, and an effect such as improvement of moldability or suppression of sagging is obtained.

  The knitted fabric of the present invention is preferably subjected to finishing. Moreover, it is also preferable to provide functions such as moisture absorption, water absorption, antibacterial, deodorization, and quick drying within a range that does not impair the effects of the present invention. Examples of the function imparting method include a dip-nip method and a spray method. Moreover, you may print a pattern by methods, such as textile printing.

Knitted fabric of the present invention, it is preferred basis weight in the range of 100 to 500 g / ^{m 2.} By setting the basis weight to 100 g / m ² or more, the strength of the knitted fabric is improved, and it is possible to suppress the tearing when used as an automobile interior material. Further, by setting the basis weight to 500 g / m ² or less, the elongation can be improved and generation of wrinkles during molding can be suppressed. About a minimum, 120 g / m < ² > or more is more preferable, and it is further more preferable that it is 140 g / m < ² > or more. The upper limit is more preferably 400 g / ^{m 2} or less, and more preferably 300 g / ^{m 2} or less.

  The knitted fabric of the present invention preferably has a thickness in the range of 0.4 to 3.0 mm. By setting the thickness to 0.4 mm or more, sufficient strength is imparted to the knitted fabric, and it is possible to suppress tearing during use as an automobile interior material. On the other hand, when the thickness is 3.0 mm or less, it is possible to suppress problems such as improvement in elongation and generation of wrinkles during molding. The lower limit is more preferably 0.5 mm or more, and the upper limit is more preferably 1.5 mm or less.

  In the knitted fabric of the present invention, it is preferable that the stress at 5% elongation is in the range of 10 to 80 N / 2.54 cm in the vertical direction and the horizontal direction. Here, the warp direction of the knitted fabric refers to a direction parallel to the roll flow direction during winding in the manufacturing process, and the horizontal direction of the knitted fabric refers to a direction perpendicular to the warp direction of the knitted fabric. By setting it as this range, when assembling a knitted fabric into a sheet | seat, it is excellent in a moldability. That is, by setting the stress at 5% elongation to 10 N / 2.54 cm or more, it is possible to suppress the occurrence of sagging during molding. By setting it to 80 N / 2.54 cm or less, generation | occurrence | production of a tear and a wrinkle can be suppressed. The lower limit is more preferably 15 N / 2.54 cm or more, and the upper limit is more preferably 70 N / 2.54 cm or less. The stress at the time of 5% elongation of the knitted fabric in the vertical direction and the horizontal direction is within the above range by appropriately adjusting the knitted fabric configuration, the knitted fabric basis weight, the knitted density of the knitted fabric and the knitted structure of the knitted fabric It can be.

  The knitted fabric of the present invention preferably has a static friction coefficient of at least 0.9 on one side. Here, the directionality of the knitted fabric is not limited. The static friction coefficient is a ratio between the weight of the object at the moment when the object starts to slide and the applied force, and the larger the numerical value, the less the slip. In the present invention, the number of rotations of the cloth roller, cloth tension or sandpaper count and rotation speed, and the thickness and knitting density of the cloth are adjusted to an appropriate range in the surface raising treatment of the cloth. A knitted fabric satisfying the static friction coefficient range can be obtained. Here, when the coefficient of static friction of at least one surface of the knitted fabric is 0.9 or more, it is possible to obtain a knitted fabric with high slip resistance while having a high-quality feeling with a smooth touch. From the above viewpoint, 1.0 or more is more preferable, and 1.1 or more is more preferable. Moreover, although it does not specifically limit about an upper limit, From a viewpoint that adhesion of dust can be suppressed, it is preferable that it is 2.5 or less, and it is more preferable that it is 1.8 or less. The coefficient of static friction of the knitted fabric of the present invention is measured at the time of dry friction, and when the hair flow of the knitted fabric subjected to the raising treatment is different in the roll direction upward and downward, the flow of the hair is from the bottom. It is installed and measured against upward. In addition, drying at the time of dry friction here is achieved by making a test piece into a standard state before measurement.

  The knitted fabric of the present invention is required to have a combustion rate of 100 mm / min or less by a combustion test method defined in the FMVSS-302 method. When the burning rate exceeds 100 mm / min, it becomes a safety problem and is not suitable as an automobile interior material. More preferably, it is 60 mm / min or less. More preferably, it is 40 mm / min. By adjusting the content and arrangement of the flame retardant yarn used for the front yarn and / or the back yarn, a knitted fabric having the above flame retardant performance can be obtained.

  The knitted fabric of the present invention is preferably grade 3 or higher in light fastness measured by continuous irradiation treatment at a black panel temperature of 83 ° C. for 200 hours with a fade meter. By setting it as the third grade or higher, it becomes excellent in light resistance, and a knitted fabric more suitable for automobile interior materials can be obtained. More preferably, it is 3.5 or higher.

  The knitted fabric of the present invention preferably has a fogging degree of 15% or less. The fogging degree is referred to as fogging, haze, etc., and in the case of automobile interior materials, it represents the degree of haze on the window glass of the vehicle. In the manufacturing process of automobile interior materials, low sublimation substances contained in dyeing assistants and flame retardants sublimate, and adhere to the window glass, thereby causing the window glass to become cloudy or cloudy. Here, when the fogging degree of the knitted fabric is high, fogging and fogging of the window glass become more remarkable. The fogging degree of the knitted fabric is more preferably 10% or less. More preferably, it is 7% or less. In imparting flame retardancy, a knitted fabric having a performance with a fogging degree of 15% or less can be obtained by adjusting the amount of flame retardant fixing and the content of flame retardant yarn by conventional post-processing.

  The knitted fabric obtained by the present invention can be preferably used for automobile interior materials and chair upholstery. More preferably, it can be preferably used for automobile interior materials for at least one application selected from a ceiling, seat, pillar, sun visor, armrest, headrest or door trim skin. Among them, the seat skin is a portion where the occupant is in close contact with the seat and is required for smoothness and holdability, and is preferably exemplified. In particular, the main seat skin used for the seat back and the seat cushion skin is preferable among the seat skins.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these. Moreover, the performance in an Example was measured with the following method.
[Measuring method]
(1) Measured biotinylation rate After pulverizing the test piece with sandpaper and a pulverizer, it is heated with copper oxide to completely oxidize it to carbon dioxide, and this is reduced to graphite with iron powder. Converted to one compound. The obtained graphite sample was introduced into an AMS apparatus, and the ¹⁴ C concentration was measured. In addition, the ¹⁴ C concentration of oxalic acid (supplied by American Standards and Science and Technology Association NIST), which is a standard substance, was also measured. Here, the ratio of ¹⁴ C and ¹² C in the sample ^{(14 C / 12 C) 14} As, the ratio of ¹⁴ C and ¹² C of the standard substance ^{(14 C / 12 C)} and ¹⁴ Ar, the following equation △ ¹⁴ C was determined.
Δ ¹⁴ C = {( ¹⁴ As− ¹⁴ Ar) / ¹⁴ Ar} × 1000
From this Δ ¹⁴ C, pMC (percent Modern Carbon) was determined by the following equation.
pMC = Δ ¹⁴ C / 10 + 100
Based on the ASTM-D6866 method, which is an American material test standard, this pMC was multiplied by 0.95 (= 100/105) according to the following formula to obtain the measured biotinylation rate.
Measured bio-ization rate (%) = 0.95 × pMC
Rounded to the first decimal place. When it exceeded 100%, it was set as 100%.

(2) Coefficient of static friction Measured using a sliding angle measuring instrument. Place the test piece on the rising plate in a horizontal state, place the flat indenter with the friction cloth on it so that the friction cloth contacts the test piece, and tilt the rising plate so that the flat indenter is integrated with the test piece. The angle θ (°) when sliding out was measured. The static friction coefficient μ was calculated from the obtained angle θ (°) by the following equation.
μ = tan θ
In addition, the cotton cloth width No. 3 (Japanese Standards Association) based on JISL0803 was used for the friction cloth. The flat indenter weighed 870 g and had a contact area of 5 × 10 cm with the sample piece. Depending on the elastic specimen, if the frictional force between the test piece and the flat indenter is smaller than the frictional force between the test piece and the friction cloth, the flat indenter will slide due to the elongation of the test piece. In some cases, however, it was not judged that slipping occurred at this point, and the angle when the flat indenter and the test piece slipped together as described above was measured. In each measurement, the n number was set to 3, and the average value was obtained. The test piece was tested in a standard state by the method specified in JIS L 0105 (5.3).

(3) Weight of knitted fabric (g / m ² )
The mass per unit area of the knitted fabric was determined by the method defined in JIS L 1018 (8.4.2).

(4) Thickness of knitted fabric (mm)
The thickness of the knitted fabric was determined by the method defined in JIS L 1018 (8.5.1).

(5) Stress at 5% elongation Vertical and horizontal test pieces each having a length of 30 cm and a width of 5 cm are attached to a tensile test with a clamp of 2.54 cm in width, and the test pieces are attached at a grip interval of 200 mm. The stress value (N / 2.54 cm) at 5% elongation was determined at a speed. In each measurement, the n number was set to 3, and the average value was obtained.

(6) Combustion rate Based on the method prescribed | regulated to FMVSS-302, the combustion rate (mm / min) was computed from following Formula.
B = 60 × D / T
Where B: burning rate (mm / min),
D: Combustion length (mm)
T: Dmm burning time (seconds)
It is.

(7) Light fastness knitted fabric (with urethane backing) is subjected to continuous irradiation treatment at a black panel temperature of 83 ° C. for 200 hours with a fade meter (manufactured by Suga Test Instruments Co., Ltd., FAL-5H). Visual judgment was made at the stage (5th grade: inconspicuous, 4th grade: slightly recognizable, 3rd grade: clearly recognized but not noticeable, 2nd grade: slightly noticeable, 1st grade: very noticeable).

(8) Degree of fogging In accordance with JASO M 403-88 (6.22), a circular test piece with a diameter of 70 mm is put into a beaker of a haze test apparatus with the back side up, and a transparent glass plate is used as a lid. After heating, the fogging on the glass plate after heating was calculated from the following equation using an integrating sphere light transmittance measuring device specified in JIS K 7105.
Fogging degree (%) = {(transmitted light amount of glass plate before treatment) − (transmitted light amount of glass plate after treatment)} × 10 / (transmitted light amount of glass plate before treatment).

(9) Touch feeling The touch feeling of the knitted fabric surface was evaluated by 10 subjects. And it evaluated comprehensively by the total score of each person's evaluation.
<Evaluation criteria>
3 points: Soft touch and good.
2 points: neither good nor uncomfortable.
1 point: There is a feeling of coarseness and is uncomfortable.
<Total score>
A (good): 25 to 30 points ◯ (possible): 17 to 25 points x (inferior): 10 to 16 points.

(10) Slip resistance at the time of seating The knitted fabric of the present invention is bonded to an automobile seat to form a car seat, the seat is tilted back 20 degrees from a right angle, and the subject leans back against the car seat. Sensory evaluation of the slip resistance of the buttocks when seated. 10 people were evaluated, and those who felt that the seat had slip resistance and the buttocks were difficult to slip were “very good” for 8 or more, “good” for 4-7, and “less than 3” “Inferior” respectively.

(11) Ratio of the number of raised loop piles having an angle of 60 to 90 degrees Cut along a direction perpendicular to the knitting direction of the knitted fabric. After the metal sample was vapor deposited on the cut measurement sample using a Hitachi metal vapor deposition device (trade name E-1010), the sample was mounted on a Hitachi scanning electron microscope (trade name S-3500). Five photos were taken at a magnification of 100 to 100 times. In the photographed photo, the number of raised loop piles where the angle of the raised tissue observed horizontally between 1 mm was 60 to 90 degrees and the total number of fibers of the raised tissue were counted, and the ratio (%) was calculated. The average value of 5 places was calculated.

(12) Oxygen index (LOI) value of fiber The oxygen index (LOI) of the fiber using an oxygen index type flammability tester ON-1 type (manufactured by Suga Test Instruments Co., Ltd.) according to JIS K 7202-2 (2007). ) Measure the value.

(Reference Example 1)
A method for producing 84 dtex / 36 filament polyethylene terephthalate yarn (highly oriented undrawn yarn) containing a biomass resource-derived component will be described. Petroleum-derived terephthalic acid and biomass resource (sugarcane) -derived ethylene glycol (manufactured by India Glycol) are supplied to the esterification reactor as a slurry with a molar ratio of 1 / 1.6, and the temperature is 250 ° C. and the pressure is 50 hPaG. Reacted for hours. Thereafter, the mixture was transferred to a polymerization reaction vessel, and 1.7 × 10 −4 mol of antimony trioxide as a polymerization catalyst was added to 1 mol of the acid component, and the temperature in the polymerization reaction vessel was reduced at a temperature of 280 ° C. and a pressure of 0.67 hPa. Polymerization was performed for 2 hours to obtain biomass-derived polyethylene terephthalate having an intrinsic viscosity of 0.61.

  This polyethylene terephthalate chip was vacuum dried at a temperature of 150 ° C. for 15 hours, then supplied to an extruder-type spinning machine, melt-spun at a spinning temperature of 300 ° C. and a spinning speed of 3050 m / min, and an 84 dtex / 36 filament polyethylene terephthalate yarn. (Highly oriented undrawn yarn) was obtained. The polyethylene terephthalate yarn had a tensile strength of 4.1 cN / dtex, an elongation of 39%, and an oxygen index (LOI) value of 22.

(Reference Example 2)
A method for producing 84 dtex / 36 filament flame-retardant polyethylene terephthalate yarn (highly oriented undrawn yarn) obtained by copolymerizing a phosphorus compound will be described. In Reference Example 1, as ethylene glycol, petroleum-derived ethylene glycol (manufactured by BASF, raw material is made of petroleum, purity is 99% or more), 2-carboxyethyl (phenyl) phosphinic acid is converted to phosphorus element in the polymerization reaction tank The flame-retardant yarn (highly oriented undrawn yarn) of 84 dtex / 36 filaments copolymerized with a phosphorus compound was obtained by polymerization and spinning in the same manner as in Reference Example 1 except that the amount was 5800 ppm. . The flame retardant polyethylene terephthalate yarn (highly oriented undrawn yarn) had an oxygen index (LOI) value of 42.

Example 1
A 28 gauge tricot knitting machine was used. Use three polyethylene terephthalate yarns of Reference Example 1 for the front yarn and alternate one of the polyethylene terephthalate yarn of Reference Example 1 and the flame retardant yarn of Reference Example 2 for the back yarn, and contain the flame retardant yarn contained in the back yarn A tricot knitted fabric was obtained by knitting so that the amount was 18% by mass with respect to 100% by mass of the knitted fabric. The resulting knitted fabric was dyed with a dyeing bath of disperse dye 2% owf for 30 minutes at a temperature of 130 ° C. using a liquid dyeing machine, and washed with hot water at 80 ° C. for 20 minutes twice. Air-dry, heat-treat at a temperature of 170 ° C. for 2 minutes, and then pass three sets of the needle-raising machine against the front side surface with the roller rotating direction reverse, normal direction, and reverse direction as one set, after drying, A knitted fabric with raised loop piles was obtained.
The knitted fabric thus obtained was evaluated. The results are shown in Table 1. The burning rate was good at 30 mm / min, the touch feeling was “good”, and the light fastness was as good as 3.5 grade.

(Example 2)
As ethylene glycol, petroleum-derived ethylene glycol (manufactured by BASF, the raw material is made of petroleum, the purity is 99% or more), the flame retardant yarn of Reference Example 2 is 4% by mass with respect to 100% by mass of the knitted fabric. A knitted fabric was obtained in the same manner as in Example 1 except that it was included.
The knitted fabric thus obtained was evaluated. The results are shown in Table 1. The burning rate was good at 25 mm / min, the touch feeling was “good”, and the light fastness was good at the third grade.

(Example 3)
A knitted fabric was obtained in the same manner as in Example 1 except that the content of the flame retardant yarn of Reference Example 2 used for the back yarn was changed to 15% by mass with respect to 100% by mass of the knitted fabric.
The knitted fabric thus obtained was evaluated. The results are shown in Table 1. The burning rate was good at 41 mm / min, the touch feeling was “good”, and the light fastness was as good as 3.5 grade.

Example 4
The content of the flame retardant yarn of Reference Example 2 used for the back yarn is changed to 30% by mass with respect to 100% by mass of the knitted fabric. A knitted fabric was obtained in the same manner as in Example 1 except that the reverse direction was changed to one set and passed through two sets.
The knitted fabric thus obtained was evaluated. The results are shown in Table 1. The burning rate was as good as 20 mm / min, the touch feeling was “OK”, and the light fastness was as good as the third grade.

(Example 5)
The content of the flame retardant yarn of Reference Example 2 used for the back yarn is changed to 10% by mass with respect to 100% by mass of the knitted fabric, and knitted so that the flame retardant yarn of the back yarn and the non-flame retardant yarn are not alternated. A knitted fabric was obtained in the same manner as in Example 1.
The knitted fabric thus obtained was evaluated. The results are shown in Table 1. The burning rate was good at 88 mm / min, the touch feeling was “good”, and the light fastness was as good as 3.5 grade.

(Example 6)
A knitted fabric was obtained in the same manner as in Example 1 except that the content of the flame retardant yarn of Reference Example 2 used for the back yarn was changed to 35% by mass with respect to 100% by mass of the knitted fabric.
The knitted fabric thus obtained was evaluated. The results are shown in Table 2. The burning rate was as good as 10 mm / min, the touch feeling was “good”, and the light fastness was as good as the third grade.

(Example 7)
A knitted fabric was obtained in the same manner as in Example 1 except that the back yarn was knitted so as not to alternate between the flame-retardant yarn and the non-flame-retardant yarn.
The knitted fabric thus obtained was evaluated. The results are shown in Table 2. The burning rate was good at 65 mm / min, the touch feeling was “good”, and the light fastness was as good as 3.5 grade.

(Example 8)
In the raising process, a knitted fabric was obtained in the same manner as in Example 1, except that the forward direction of the rotation direction of the roller was changed to once through the needle cloth raising machine.

  The knitted fabric thus obtained was evaluated. The results are shown in Table 2. The burning rate was good at 20 mm / min, the touch feeling was “poor”, and the light fastness was as good as 3.5 grade.

Example 9
A knitted fabric was obtained in the same manner as in Example 1 except that the raising treatment was not performed.
The knitted fabric thus obtained was evaluated. The results are shown in Table 2. The burning rate was good at 30 mm / min, the touch feeling was “poor”, and the light fastness was good at 3.5 grade.

(Comparative Example 1)
As ethylene glycol, petroleum-derived ethylene glycol (manufactured by BASF, raw material is petroleum, purity is 99% or more) and the front yarn contains 10% by mass of the flame retardant yarn of Reference Example 2 with respect to 100% by mass of the knitted fabric. A knitted fabric was obtained in the same manner as in Example 5 except that the raising treatment was not performed.
The knitted fabric thus obtained was evaluated. The results are shown in Table 3. The burning rate was good at 45 mm / min, the touch feeling was “poor”, and the light fastness was poor at 2.5 grade.

(Comparative Example 2)
As ethylene glycol, petroleum-derived ethylene glycol (manufactured by BASF, raw material is made of petroleum, purity is 99% or more), and the content of the flame retardant yarn of Reference Example 2 used for the back yarn is 100% by mass of the knitted fabric. A knitted fabric was obtained in the same manner as in Example 5 except that the content was changed to 5% by mass.
The knitted fabric thus obtained was evaluated. The results are shown in Table 3. The burning rate was poor at 110 mm / min, the touch feeling was “good”, and the light fastness was as good as 3.5 grade.

(Comparative Example 3)
As ethylene glycol, petroleum-derived ethylene glycol (manufactured by BASF, raw material is made of petroleum, purity is 99% or more), and the content of the flame retardant yarn of Reference Example 2 used for the back yarn is 100% by mass of the knitted fabric. A knitted fabric was obtained in the same manner as in Example 5 except that the content was changed to 40% by mass.
The knitted fabric thus obtained was evaluated. The results are shown in Table 3. The burning rate was as good as 0 mm / min, the touch feeling was “good”, and the light fastness was as good as the third grade. However, the stress at 5% elongation was 82 N / 2.54 cm in the vertical direction and 88 N / 2.54 cm in the horizontal direction, which was inferior in moldability and unsuitable for automobile interior materials.

(Comparative Example 4)
A non-flame retardant yarn is used instead of a flame retardant yarn, a knitted fabric is knitted with two rivets, and air-dyeing after dyeing using a liquid dyeing machine is followed by a flame retardant nonnene SKP-230 as a post-flame retardant dip nip treatment. A knitted fabric was obtained in the same manner as in Example 2 except that 70 g / m ² was fixed and added (manufactured by Maruhishi Oil Chemical Co., Ltd.) by a dip-nip method.
The knitted fabric thus obtained was evaluated. The results are shown in Table 3. The burning rate was good at 0 mm / min, the touch feeling was “poor”, and the light fastness was as good as 3.5 grade. However, the fogging degree was poor at 16%.

Claims (6)

A front yarn and a back yarn, the front yarn and the back yarn include a flame retardant yarn, and the content of the flame retardant yarn contained in the front yarn is 0 to 5% by mass with respect to 100% by mass of the knitted fabric, A knitted fabric in which the content of the flame retardant yarn contained in the back yarn is 10 to 35% by mass with respect to 100% by mass of the knitted fabric, and the combustion rate in the combustion test method defined in the FMVSS-302 method is 100 mm / min or less. Earth.   The knitted fabric according to claim 1, wherein the content of the flame retardant yarn contained in the back yarn is 15 to 30% by mass with respect to 100% by mass of the knitted fabric.   The knitted fabric according to claim 1 or 2, wherein the back yarn includes a flame retardant yarn and a non-flame retardant yarn, and the flame retardant yarn and the non-flame retardant yarn are alternately arranged in all or part of the back yarn. The knitted fabric according to any one of claims 1 to 3, wherein at least one surface has a static friction coefficient of 0.9 or more. The knitted fabric according to any one of claims 1 to 4, wherein at least one surface is subjected to raising treatment. Knitted fabric according to any one of claims 1 to 5 weight per unit area is 100 to 500 g / ^{m 2.}