Flame-retardant finishing agent for polyester-based synthetic fiber structures, flame-retardant polyester-based synthetic fiber structure, and method for flame-retardant finishing of polyester-based synthetic fiber structure

Abstract

To provide: a flame-retardant finishing agent for polyester-based synthetic fiber structures, the agent having a reduced halogen content and being less likely to cause edge staining; a flame-retardant polyester-based synthetic fiber structure; and a method for a flame-retardant finishing of a polyester-based synthetic fiber structure.SOLUTION: The flame-retardant finishing agent comprises a flame-retardant agent including at least one selected from the group consisting of first phosphoric acid ester compounds represented by general formula (1) (where R1, R2 and R3 each independently represent an alkyl group having 12-16 carbon atoms) and second phosphoric acid ester compounds represented by general formula (2) (where R4 represents an alkyl group having 12-16 carbon atoms, and R5 represents hydrogen or an alkyl group having 12-16 carbon atoms).SELECTED DRAWING: None

Description

Technical Field

[0001] The present disclosure relates to a flame retardant treating agent for polyester synthetic fiber structures, a flame retardant polyester synthetic fiber structure, and a method for flame retardant treatment of polyester synthetic fiber structures.

Background Art

[0002] For the flame retardant treatment of fiber structures, a flame retardant and a processing method suitable for the fiber material are used. Conventionally, water-soluble salts such as guanidine phosphate and carbamate phosphate have been used as flame retardants for polyester synthetic fiber structures, and flame retardant processing has been performed by the padding method (for example, Patent Document 1).

[0003] Also, it is known to flame retard polyester synthetic fiber structures using halogen compounds by the exhaustion method or the padding method (for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when water-soluble salts are used as flame retardants, when the flame retardant-treated polyester synthetic fiber structure absorbs and releases moisture, crystals may precipitate on the surface of the fiber structure, or bleeding, also referred to as blooming, may occur when water adheres to the surface of the fiber structure. Also, from the perspective of environmental load, it is preferable that the flame retardant does not contain halogen compounds or that the usage amount is small.

[0006] The present disclosure aims to provide a flame retardant processing agent for polyester synthetic fiber structures, a flame retardant polyester synthetic fiber structure, and a flame retardant processing method for polyester synthetic fiber structures, which have a suppressed halogen content and are less likely to catch fire.

Means for Solving the Problems

[0007] The flame retardant processing agent for polyester synthetic fiber structures according to one embodiment of the present disclosure includes a first phosphoric acid ester compound represented by the following general formula (1) (in formula (1), R1, R2, and R3 independently represent an alkyl group having 12 to 16 carbon atoms), and

Chemical Formula

Chemical Formula

Effects of the Invention

[0008] According to one embodiment of the present disclosure, there are provided a flame retardant processing agent for polyester synthetic fiber structures, a flame retardant polyester synthetic fiber structure, and a flame retardant processing method for polyester synthetic fiber structures, which have a suppressed halogen content and are less likely to catch fire.

Modes for Carrying Out the Invention

[0009] Polyester synthetic fibers are hydrophobic synthetic fibers. During sewing with a sewing machine, due to friction with the sewing thread, the polyester synthetic fiber fabric is damaged and is likely to break. Therefore, for the purpose of improving sewability, paraffin-based softeners or silicone-based softeners may be applied to polyester synthetic fibers by post-treatment using the padding method as smoothing agents.

[0010] Since such a smoothing agent is flammable, the polyester-based synthetic fiber to which the smoothing agent is applied has reduced flame retardancy. Therefore, in order to flame-retardant process the polyester-based synthetic fiber to which the smoothing agent is applied, it is necessary to use a larger amount of the flame-retardant processing agent. Also, it is conceivable that this may deteriorate the texture of the polyester-based synthetic fiber.

[0011] If the flame-retardant processing agent also functions as a smoothing agent, it is considered that the amount of the smoothing agent for improving the sewability applied to the polyester-based synthetic fiber can be reduced or the smoothing agent can be omitted. Also, if the amount of the smoothing agent used is reduced, the amount of the flame-retardant processing agent used can also be reduced. Based on such an idea, the inventor of the present application conceived a novel flame-retardant processing agent for a polyester-based synthetic fiber structure.

[0012] Hereinafter, embodiments of the present disclosure will be described. The present disclosure is not limited to the following embodiments, and design changes can be appropriately made within the scope that satisfies the configuration of the present disclosure. Each configuration described in the embodiments may be appropriately combined or changed without departing from the gist of the present disclosure.

[0013] The flame-retardant processing agent of the present disclosure can be used for flame-retardant processing of various fiber structures, and is particularly preferably used for flame-retardant processing of polyester-based synthetic fiber structures. In the present disclosure, the polyester-based synthetic fiber structure refers to a fiber containing at least polyester fiber, and a fabric such as a yarn, cotton, woven fabric, or non-woven fabric containing such a fiber. Preferably, the polyester-based synthetic fiber structure is a polyester fiber, a yarn made of polyester fiber, cotton, or a fabric such as a woven fabric or non-woven fabric. Further, the fabric such as a woven fabric or non-woven fabric may be a single layer, a laminate of two or more layers, or a composite made of a yarn, cotton, woven fabric, non-woven fabric, or the like.

[0014] The above-mentioned polyester fibers are made of polymers such as polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene terephthalate / isophthalate, polyethylene terephthalate / 5-sulfoisophthalate, polyethylene terephthalate / polyoxybenzoyl, polybutylene terephthalate / isophthalate, poly(D-lactic acid), poly(L-lactic acid), copolymers of D-lactic acid and L-lactic acid, copolymers of D-lactic acid and aliphatic hydroxycarboxylic acids, copolymers of L-lactic acid and aliphatic hydroxycarboxylic acids, polycaprolactones such as poly-ε-caprolactone (PCL), poly(malic acid), polyhydroxybutyric acid, polyhydroxyvaleric acid, polyaliphatic hydroxycarboxylic acids such as β-hydroxybutyric acid (3HB)-3-hydroxyvaleric acid (3HV) random copolymer, polyesters of glycols and aliphatic dicarboxylic acids such as polyethylene succinate (PES), polybutylene succinate (PBS), polybutylene adipate, polybutylene succinate-adipate copolymer, etc.

[0015] Also, the above polymer may be a copolymer with a functional compound such as a flame retardant. Also, a functional compound such as an antibacterial agent may be blended during the polymerization of the polymer or during the spinning.

[0016] The flame-retardant polyester-based synthetic fiber structure flame-retardantly processed with the flame-retardant processing agent of the present disclosure is suitably used for, for example, seat seats, seat covers, curtains, wallpapers, ceiling cloths, carpets, satin curtains, construction curing sheets, tents, canvas, etc.

[0017] (First Embodiment) The flame-retardant processing agent for the polyester-based synthetic fiber structure of this embodiment includes a flame retardant. The flame retardant contains at least one selected from the group consisting of a first phosphoric acid ester compound represented by the following general formula (1) and a second phosphoric acid ester compound represented by the following general formula (2). It is preferable that the first phosphoric acid ester compound and the second phosphoric acid ester compound do not contain halogen. [Chem.] [Chem.] Here, in formula (1), R1, R2, and R3 each independently represent an alkyl group having 12 to 16 carbon atoms. In formula (2), R4 represents an alkyl group having 12 to 16 carbon atoms, and R5 represents an alkyl group having 12 to 16 carbon atoms or hydrogen.

[0018] Specifically, R1, R2, R3, R4, and R5 are linear or branched alkyl groups having 12 to 16 carbon atoms. R5 may be hydrogen. The linear alkyl groups having 12 to 16 carbon atoms are dodecane group, tridecane group, tetradecane group, pentadecane group, and hexadecane group, and do not contain unsaturated bonds. The branched alkyl groups having 12 to 16 carbon atoms may have side chains at any one or two or more positions as long as the number of carbon atoms is 12 or more and 16 or less. Also, there is no particular limitation on the number of carbon atoms in the side chain. For example, the branched alkyl groups having 12 to 16 carbon atoms may be isododecane group, isotridecane group, isotetradecane group, isopentadecane group, and isohexadecane group, 2-butyloctyl group, 2-hexyldecyl group.

[0019] In general formula (1), R1, R2, and R3 may all be the same alkyl group, or two of them may be the same and one may be different from the other two, or the three may be different from each other. Similarly, in general formula (2), R4 and R5 may be the same alkyl group or different, and R5 may be hydrogen.

[0020] The first phosphate ester compound represented by the general formula (1) is a triphosphate ester, and the second phosphate ester compound represented by the general formula (2) is a monophosphate ester or a diphosphate ester. The flame retardant contains at least one selected from the group consisting of the first phosphate ester compound represented by the general formula (1) and the second phosphate ester compound represented by the general formula (2). The flame retardant may contain two or more different first phosphate ester compounds. Similarly, the flame retardant may contain two or more different second phosphate ester compounds.

[0021] The first phosphate ester compound and the second phosphate ester compound plasticize the polyester-based synthetic fiber structure during combustion and improve the dripping property. In addition, metaphosphoric acid is generated by thermal decomposition, and polymetaphosphoric acid is generated by dehydration condensation. Further, the alkyl groups represented by R1 to R5 also polymerize to form a carbonized layer. These become char and contribute to the flame retardancy of the polyester-based synthetic fiber structure.

[0022] The first phosphate ester compound represented by the general formula (1) and the second phosphate ester compound represented by the general formula (2) exhibit lipophilicity that is difficult to dissolve in water because the carbon number of the alkyl groups represented by R1 to R5 is 12 or more and 16 or less. Therefore, even if water adheres to the surface of the polyester-based synthetic fiber structure, the flame retardant hardly dissolves in water and it is difficult for dripping to occur.

[0023] Also, when the alkyl groups represented by R1 to R5 are linear alkyl groups, the melting points of the first phosphate ester compound and the second phosphate ester compound are higher than room temperature, and the first phosphate ester compound and the second phosphate ester compound are solids at room temperature. Furthermore, since R1 to R5 are hydrocarbons with a large carbon number, the first phosphate ester compound and the second phosphate ester compound exhibit lubricity like paraffin. Therefore, by performing flame retardant processing using the flame retardant processing agent of the present embodiment, the polyester-based synthetic fiber structure can also have an effect of preventing yarn breakage.

[0024] When the alkyl groups represented by R1 to R5 are branched alkyl groups, the melting points of the first phosphoric acid ester compound and the second phosphoric acid ester compound are lower than those when the alkyl groups represented by R1 to R5 are linear alkyl groups, and generally become liquid at normal temperature. However, even in this case, since R1 to R5 are hydrocarbons with a large number of carbon atoms, they exhibit a certain degree of lubricity like liquid paraffin. Therefore, by performing flame-retardant processing using the flame-retardant processing agent of the present embodiment, the polyester-based synthetic fiber structure can also achieve the effect of preventing yarn breakage. The first phosphoric acid ester compound and the second phosphoric acid ester compound in which the alkyl groups represented by R1 to R5 are branched alkyl groups are advantageous in terms of the manufacturing cost of the flame-retardant processing agent, such as being easily available industrially and inexpensive.

[0025] More specifically, in the general formula (1), the melting point of tridodecyl = phosphate, where R1, R2, and R3 are each a linear dodecyl group, is about 35°C, and the melting point of trihexadecyl = phosphate, where R1, R2, and R3 are each a linear hexadecyl group, is about 62°C. Also, in the general formula (2), the melting point of monododecyl = phosphate, where R4 is a dodecyl group and R5 is hydrogen, is about 39°C, and the melting point of monohexadecyl = phosphate, where R4 is a hexadecyl group and R5 is hydrogen, is about 71°C. The melting point of dihexadecyl = phosphate, where R4 and R5 are hexadecyl groups, is about 74°C. Thus, the first phosphoric acid ester compound is solid at normal temperature if R1, R2, and R3 are linear alkyl groups having 12 to 16 carbon atoms, and the second phosphoric acid ester compound is solid at normal temperature if R4 and R5 are linear alkyl groups having 12 to 16 carbon atoms.

[0026] As described above, if the flame retardant is solid at room temperature, it is possible to achieve a higher effect of preventing thread breakage. On the other hand, from the viewpoints of the stability of the flame retardant during storage and the uniformity during dilution in the flame retardant processing agent, the flame retardant may preferably be a liquid in some cases. Also, flame retardants that are liquid at room temperature are generally easily available and inexpensive. For this reason, the flame retardant may contain two or more types of first phosphoric ester compounds and / or second phosphoric ester compounds having different melting points. Thereby, it is possible to adjust the melting point of the flame retardant or enhance the stability and dispersibility of the flame retardant in the flame retardant processing agent.

[0027] The first phosphoric ester compound may be at least one selected from the group consisting of tridodecyl phosphate, tritridecyl phosphate, tritetradecyl phosphate, tripentadecyl phosphate, trihexadecyl phosphate, and triisotridecyl phosphate.

[0028] The second phosphoric ester compound may be at least one selected from the group consisting of dodecan-1-yl dihydrogen phosphate, tridecan-1-yl dihydrogen phosphate, tetradecan-1-yl dihydrogen phosphate, pentadecan-1-yl dihydrogen phosphate, hexadecan-1-yl dihydrogen phosphate, didodecan-1-yl hydrogen phosphate, ditridecan-1-yl hydrogen phosphate, ditetradecan-1-yl hydrogen phosphate, dipentadecan-1-yl hydrogen phosphate, dihexadecan-1-yl hydrogen phosphate, isotridecan-1-yl dihydrogen phosphate, and diisotridecan-1-yl hydrogen phosphate.

[0029] The phosphorus atomic weight in the flame retardant is preferably 4.0% or more and 11.7% or less. When the phosphorus atomic weight is less than 4.0%, the flame retardant effect of the flame retardant processing agent may not be sufficiently obtained. From the perspective of the flame retardant effect, there is no particular upper limit for the phosphorus atomic weight in the flame retardant. When R1, R2, R3, R4, and R5 of the phosphate ester compound represented by the general formula (1) and the general formula (2) are alkyl groups having 12 to 16 carbon atoms, the maximum atomic weight that can be obtained is 11.7%.

[0030] For the first phosphate ester compound and / or the second phosphate ester compound, the higher the carbon number of R1, R2, R3, R4, and R5, and the more the number of straight-chain alkyl groups increases, the higher the melting point and the higher the effect of preventing yarn breakage. On the other hand, the higher the carbon number of R1, R2, R3, R4, and R5, the lower the phosphorus atomic weight in the first phosphate ester compound and / or the second phosphate ester compound. Therefore, in order for the phosphorus atomic weight in the flame retardant to be within the above range and to obtain a desired yarn breakage prevention effect, it is preferable to include two or more different types of the first phosphate ester compound and / or the second phosphate ester compound in the flame retardant.

[0031] The flame retardant processing agent of this embodiment further contains a surfactant, and the flame retardant is dispersed in water by the surfactant. When the flame retardant is a liquid, the flame retardant is emulsified in water by an emulsifier. In the present disclosure, the surfactant and the emulsifier are collectively referred to as a surfactant without distinction.

[0032] As the surfactant, a nonionic surfactant, an anionic surfactant, or a combination thereof can be used. The addition amount of the surfactant is preferably 10 parts by weight or more and 25 parts by weight or less with respect to 100 parts by weight of the flame retardant. When the addition amount of the surfactant is more than 25 parts by weight, the friction fastness of the obtained flame-retardant polyester-based synthetic fiber structure decreases, and bleeding may occur. When the addition amount of the surfactant is less than 10 parts by weight, the flame retardant may not be emulsified or dispersed in water.

[0033] As the nonionic surfactant that can be used in the flame retardant processing agent of the present disclosure, for example, a compound represented by the following general formula (3) is preferably used. Here, in general formula (3), R6 is a linear alkyl group, a branched alkyl group or an alkylphenyl group having 8 to 30 carbon atoms, A1O is an oxyethylene group and / or an oxypropylene group, a is 0 or 1, and b is an integer of 1 to 100.

Chemical formula

[0034] In addition, as the anionic surfactant, sulfonates such as higher alcohol sulfate esters, sulfate esters, alkylbenzene sulfonates, alkylnaphthalene sulfonates, alkali metal salts of polyoxyalkylene styrenated phenyl ether sulfonates, ammonium salts, alkali metal salts and ammonium salts of bis(polyoxyalkylene styrenated phenyl ether) succinate ester sulfonates are preferably used.

[0035] The flame retardant processing agent of this embodiment may further contain other anionic surfactants, nonionic surfactants, and cationic surfactants other than the above, together with the above surfactants as required.

[0036] Examples of the anionic surfactants other than the above include sulfate esters such as higher alkyl ether sulfate esters and sulfated fatty acid esters, and phosphate esters of higher alcohols and phosphate esters of alkylene oxide adducts of higher alcohols. Also, alkanolamines such as triethanolamine may be used.

[0037] Examples of the nonionic surfactants other than the above include polyoxyalkylene type surfactants such as polyhydric alcohol aliphatic ester alkylene oxide adducts, higher alkylamine alkylene oxide adducts, and fatty acid amide alkylene oxide adducts, and polyhydric alcohol type surfactants such as alkyl glycosides and sucrose fatty acid esters.

[0038] Examples of the cationic surfactant include alkylamine salts, quaternary ammonium salts, polyoxyethylene alkylamine salts, polyethylene polyamine derivatives, and the like.

[0039] These other anionic surfactants, nonionic surfactants, and cationic surfactants may be used alone or in combination of two or more.

[0040] Water is used as the dispersion medium of the flame retardant processing agent. If necessary, the flame retardant processing agent may further contain an organic solvent such as alcohol. Examples of the organic solvent include alcohols such as methanol and ethanol, aromatic hydrocarbons such as toluene, xylene, and alkylnaphthalene, ketones such as acetone and methyl ethyl ketone, ethers such as dioxane and ethyl cellosolve, amides such as dimethylformamide, sulfoxides such as dimethyl sulfoxide, and halogenated hydrocarbons such as methylene chloride and chloroform. Preferred examples of the organic solvent include water-soluble organic solvents such as alcohols such as methanol, ethers such as acetone and ethyl cellosolve, amides such as dimethylformamide, and sulfoxides such as dimethyl sulfoxide. These organic solvents may be used in combination of two or more if necessary.

[0041] The flame retardant processing agent of this embodiment may further contain a pH adjuster. The second phosphate ester compound is a phosphoric acid monoester or a phosphoric acid diester and has a hydroxy group, so it shows acidity. Therefore, when performing flame retardant processing on a polyester synthetic fiber structure using a flame retardant processing agent containing the second phosphate ester compound as a flame retardant, low pH may damage the polyester synthetic fiber structure or the flame retardant processing equipment. In such a case, the flame retardant processing agent may further contain a pH adjuster. The pH adjuster may be any alkaline substance, and preferably includes organic amines and ammonia.

[0042] The flame retardant treating agent of this embodiment may further contain wax. As described above, according to the flame retardant treating agent of this embodiment, the first phosphate ester compound and / or the second phosphate ester compound contained in the flame retardant has the effect of preventing yarn breakage. However, when the effect of preventing yarn breakage by the flame retardant is not sufficient, or when it is desired to further enhance the effect of preventing yarn breakage, wax may be added to the flame retardant treating agent. Thereby, also during flame retardant treatment, wax different from the flame retardant can be imparted to the polyester synthetic fiber structure. Even if the effect of preventing yarn breakage by the flame retardant is not sufficient, the effect of preventing yarn breakage can be further enhanced without separately performing yarn breakage prevention treatment. As the wax for preventing yarn breakage, for example, paraffin wax having a melting point of about 40 °C or higher (115 °F wax, 130 °F wax, 155 °F wax), isoparaffin wax, rosin, etc. can be used. Rosin is a wax derived from natural products, and when added to the flame retardant treating agent, the flame retardant effect may be reduced compared to paraffin. Therefore, when adding rosin to the flame retardant treating agent, it is preferable to increase the addition amount of the flame retardant so as to obtain a sufficient flame retardant effect.

[0043] The flame retardant treating agent of this embodiment may further contain other additives such as a dispersant and a stabilizer. For example, the flame retardant treating agent may further contain a protective colloid agent such as polyvinyl alcohol, methyl cellulose, carboxymethyl cellulose, starch paste, etc. in order to enhance storage stability. Further, the flame retardant treating agent may further contain a flame retardant aid for enhancing flame retardancy, an ultraviolet absorber for enhancing light fastness, an antioxidant, etc. Further, the flame retardant treating agent may further contain a conventionally known flame retardant.

[0044] The flame retardant treating agent of this embodiment is obtained by mixing the above-mentioned raw materials in a dispersion medium. Specifically, a flame retardant, a surfactant selected as needed, a pH adjuster, and a wax are weighed, and these raw materials are mixed in the dispersion medium. Subsequently, the flame retardant is emulsified in the dispersion medium using a propeller stirrer, a homomixer, a homogenizer, or a high-pressure emulsifying device, or the flame retardant is pulverized using a wet pulverizer and made into fine particles, and then the flame retardant is dispersed in the dispersion medium, whereby the flame retardant treating agent can be obtained.

[0045] Commercially available products can be used as the raw materials. Alternatively, the first phosphoric acid ester compound and / or the second phosphoric acid ester compound may be prepared by synthesis. For example, among the second phosphoric acid ester compounds, the phosphoric acid monoester compound can be obtained by reacting phosphoric anhydride with alcohol as disclosed in Japanese Patent Publication No. 41-14416, and the phosphoric acid diester compound can be obtained by reacting phosphoric anhydride with alcohol as disclosed in Japanese Patent Laid-Open No. 59-13791. Further, the triester of phosphoric acid, which is the first phosphoric acid ester compound, can be obtained by reacting phosphoryl chloride with a higher alcohol having 12 to 16 carbon atoms in the presence of trimethylamine or the like in a suitable organic solvent.

[0046] According to the present embodiment, since the flame retardant contains a phosphate ester compound represented by the general formula (1) or the general formula (2), its solubility in water decreases. Therefore, the polyester-based synthetic fiber structure flame-retardantly processed with the flame-retardant processing agent of the present embodiment has suppressed bleeding. Further, since R1 to R5 in the general formula (1) and the general formula (2) are alkyl groups having 12 to 16 carbon atoms (R5 may be hydrogen), the flame retardant has lubricity, and the polyester-based synthetic fiber structure flame-retardantly processed has an effect of suppressing thread breakage during sewing. In particular, when R1 to R5 are linear alkyl groups (R5 may be hydrogen), the flame retardant becomes solid at normal temperature, and the flame retardant exhibits the same action and effect as wax. For this reason, the polyester-based synthetic fiber structure flame-retardantly processed with the flame-retardant processing agent of the present embodiment can exhibit a higher thread breakage prevention effect as compared with the conventionally known flame-retardant processing. Further, since the polyester-based synthetic fiber structure exhibits a thread breakage prevention effect without separately applying wax, it is possible to avoid an increase in the flammability of the polyester-based synthetic fiber structure by applying wax, and a high flame-retardant effect can be obtained even when the amount of the flame retardant applied is reduced. Further, since the flame retardant does not contain halogen, the flame-retardant processing agent of the present embodiment has a low impact on the environment.

[0047] (Second Embodiment) An embodiment of a flame-retardant polyester-based synthetic fiber structure and a method for flame-retardant processing of a polyester-based synthetic fiber structure will be described. The flame-retardant polyester-based synthetic fiber structure of the present embodiment includes a polyester-based synthetic fiber structure and a flame retardant supported on the polyester-based synthetic fiber structure.

[0048] The types and characteristics of the polyester-based synthetic fibers and fiber structures that are the objects of flame-retardant processing are as described above. Also, the uses of the polyester-based synthetic fiber structures are as described above.

[0049] The flame retardant contains at least one selected from the group consisting of a first phosphate ester compound represented by the general formula (1) and a second phosphate ester compound represented by the general formula (2), as described in the first embodiment.

[0050] The amount of the flame retardant adhered to the polyester synthetic fiber structure is preferably 0.1 to 10% by weight (% owf), more preferably in the range of 0.5 to 5% by weight, with respect to the polyester synthetic fiber structure. The adhesion amount is more preferably 0.5 to 3% by weight. When the adhesion amount is less than 0.1% by weight, it may not be possible to impart sufficient flame retardancy to the polyester synthetic fiber structure. Further, when the adhesion amount exceeds 10% by weight, problems such as the texture of the polyester synthetic fiber structure after the flame retardant treatment becoming rough and hard may occur. The appropriate adhesion amount depends on the phosphorus atomic weight of the flame retardant.

[0051] The flame-retardant polyester synthetic fiber structure of the present embodiment may further contain wax supported on the polyester synthetic fiber structure. When wax is included, even if the flame retardant is liquid at room temperature, it is possible to more reliably impart an effect of preventing yarn breakage to the polyester synthetic fiber structure. Further, when performing the flame retardant treatment, wax can be applied to the polyester synthetic fiber structure, so that it is not necessary to separately perform a treatment for preventing yarn breakage, and the productivity of the flame-retardant polyester synthetic fiber structure can be improved.

[0052] Alternatively, the flame-retardant polyester synthetic fiber structure of the present embodiment may not contain wax. If the flame retardant is solid at room temperature, the flame retardant can sufficiently exhibit the effect of preventing yarn breakage. For this reason, it is not necessary to separately perform a treatment for preventing yarn breakage, and the productivity of the flame-retardant polyester synthetic fiber structure can be improved. Further, since a combustible wax is not applied to the polyester synthetic fiber structure, effects such as improving the texture of the polyester synthetic fiber structure can be obtained by reducing the amount of the flame retardant to be applied for making the polyester synthetic fiber structure flame-retardant.

[0053] The flame-retardant polyester synthetic fiber structure of the present embodiment is obtained by subjecting the polyester synthetic fiber structure to a flame retardant treatment by post-processing using the flame retardant agent of the first embodiment to impart flame retardancy.

[0054] For example, the flame retardant processing agent of the first embodiment is diluted with water and prepared as a processing liquid. The processing liquid preferably contains the flame retardant in the range of 0.5 to 5.0% by weight.

[0055] There is no limitation on the post-processing method, and various processing methods can be used. For example, the flame retardant processing agent is attached to the polyester-based synthetic fiber structure and dried, and then heat-treated at a temperature of 100°C to 170°C for 1 to 5 minutes to support and fix the flame retardant on the polyester-based synthetic fiber structure. For example, as post-processing, methods such as padding, spraying, and coating can be used.

[0056] Also, an exhaustion method using a dyeing machine for flame retardant processing may be adopted. For example, using a package dyeing machine such as a liquid flow dyeing machine, a beam dyeing machine, or a cheese dyeing machine, the polyester-based synthetic fiber structure is immersed in the flame retardant processing agent or a processing liquid diluted therefrom, and bath treatment is performed at a temperature of 100 to 140°C to allow the flame retardant to be exhausted into the fiber interior. In this case, the flame retardant processing may be performed at any time before, simultaneously with, or after dyeing the polyester-based synthetic fiber structure.

[0057] In the flame retardant processing method of the polyester-based synthetic fiber structure of the present embodiment, treatment using other functional processing agents may be performed by mixing with the flame retardant processing agent, or before or after the flame retardant processing with the flame retardant processing agent. Examples of other functional processing agents include, for example, hard finishing agents, softening agents, antistatic agents, water and oil repellents, hand modifiers, and SR agents.

[0058] According to the present embodiment, as described in the first embodiment, in the obtained flame-retardant polyester-based synthetic fiber structure, attachment can be suppressed. Also, thread breakage during sewing of the flame-retardant polyester-based synthetic fiber structure can be suppressed.

[0059] (Examples) In order to confirm the effects and the like of the first and second embodiments, flame retardant processing agents were prepared with various compounding ratios, and the polyester-based synthetic fiber structure was subjected to flame retardant processing using the prepared flame retardant processing agents, and the properties of the obtained flame retardant polyester-based synthetic fiber structure were evaluated. 1. Preparation and evaluation method of samples

[0060] (1) Preparation of flame retardant processing agent Commercially available raw materials were used for the preparation of the flame retardant processing agent. For some flame retardants, those prepared according to the synthesis method described in the first embodiment were prepared.

[0061] Flame retardant processing agents for Samples 1 to 17 were prepared. The compounding ratios of the phosphate ester compounds, which are the flame retardants used in each sample, are shown in Table 1. Among Samples 1 to 17, for the flame retardant processing agents containing two types of second phosphate ester compounds, the two types of second phosphate ester compounds are shown as second phosphate ester A and second phosphate ester B. Table 1 shows the phosphorus atomic weight in the flame retardant and the melting point of the flame retardant. When the flame retardant contains two or more phosphate ester compounds, the phosphorus atomic weight is the phosphorus atomic weight with respect to the whole flame retardant, and the melting point is the melting point of the flame retardant as a mixture. When the flame retardant is liquid at room temperature, it is indicated as "liquid". In addition, wax was added to the flame retardant processing agents of Samples 13 to 17.

[0062] As the surfactant (emulsifier), at least one selected from polyoxyethylene sorbitan monolaurate, polyoxyethylene stearyl ether, sodium salt of bis(polyoxyalkylene styrenated phenyl ether) sulfosuccinate, triethanolamine, and sodium t-butylnaphthalene sulfonate was used. In addition, xanthan gum was used as the stabilizer. The flame retardant processing agent for each sample was prepared by mixing 20 parts by weight of the flame retardant, 75 parts by weight of water, and the surfactant and stabilizer occupying the remaining 5 parts by weight in 100 parts by weight so that the phosphorus atomic weight in the flame retardant processing agent was approximately 1 to 2% using a wet propeller stirrer or a wet grinder.

[0063] For comparison, a sample of a flame retardant treating agent containing a flame retardant different from the flame retardant used in the flame retardant treating agent of the first embodiment was prepared. As shown in Table 2, as the flame retardant, Sample 21 containing guanidine monophosphate and guanidine diphosphate, Sample 22 containing resorcinol bis(di-2,6-xylyl phosphate), Sample 23 containing diphenyl-N-phenylphosphoroamidate, and in the general formula (1), Samples 24 in which R1, R2, and R3 each contain octadecenyl (18 carbon atoms) were prepared in the same manner as Samples 1 to 17.

[0064]

Table 1

[0065]

Table 2

[0066] (2) Preparation of Flame Retardant Synthetic Fiber Structure The flame retardant treating agents of Samples 1 to 17 and Samples 21 to 24 were diluted with water, and the obtained treating liquid was applied to a polyester jersey fabric (basis weight 280 g / m 2 ) made of black-dyed yarn by the padding method and dried at 150°C for 3 minutes to obtain a flame retardant polyester-based synthetic fiber structure. The flame retardant polyester-based synthetic fiber structures obtained using the flame retardant treating agents of Samples 1 to 17 and Samples 21 to 24 are respectively referred to as the flame retardant polyester-based synthetic fiber structures of Samples 1 to 17 and Samples 21 to 24.

[0067] Table 3 and Table 4 show the adhesion amounts of the flame retardants in the obtained flame retardant polyester-based synthetic fiber structures. For Samples 1, 2, 7, and 24, Samples 1-1 and 1-2, Samples 2-1, 2-2, and 2-3, Samples 7-1 and 7-2, and Samples 24-1 and 24-2 were prepared by varying the adhesion amounts of the flame retardants. Also, Samples 27-1 and 27-2 in which only anti-fraying treatment using wax was performed without performing flame retardant treatment, and Sample 28 in which neither flame retardant treatment nor anti-fraying treatment was performed were prepared.

[0068] (3) Evaluation Combustion tests, attachment evaluation, and thread breakage evaluation were conducted.

[0069] Combustion test: In accordance with the United States Federal Motor Vehicle Safety Standard No. 302 (FMVSS 302), a horizontal combustion test was carried out. For each of the longitudinal and transverse directions of the fabric, those that self-extinguished within a combustion distance of 50 mm were judged as "self-extinguishing", and those with a combustion rate of 100 mm / min or less and greater than 100 mm / min were judged as "slow burning" and "flammable", respectively. Among the test results in the two directions, the lower evaluation was shown as the comprehensive evaluation.

[0070] Attachment evaluation: The treated fabric with flame retardant treatment was placed on urethane foam, 5 mL of pure water and boiling water were respectively dropped on the surface, and after 24 hours, the surface of the sample was observed. Those without bleeding or attachment were judged as qualified (Good, indicated by "G"), and those with bleeding or attachment were judged as unqualified (Fail, indicated by "F").

[0071] Thread breakage evaluation: Two layers of polyester jersey fabric with a width of 10 cm and a length of 30 cm (areal density 280 g / m 2 ) were overlapped, and using an industrial sewing machine (STH-8BLD-3, manufactured by Seiko Sewing Machine Co., Ltd.) equipped with a #21 ball point needle, sewn together in the length direction with a stitch pitch of 3 mm and a sewing machine rotation speed of 2000 rpm using polyester thread (Teijin Tetoron sewing thread No. 8). The sewn part was observed, and the number of places where thread breakage occurred was counted.

[0072] These results are shown in Tables 3 and 4.

[0073]

Table 3

[0074]

Table 4

[0075] 2. Results and Discussion As shown in Table 1, the phosphorus atomic weight of the first phosphate ester compound and the second phosphate ester compound used as flame retardants is the smallest, 4% by weight, when R1, R2, and R3 are each a hexadecyl group, and the phosphorus atomic weight is the largest, 11.7% by weight, when R4 is a dodecyl group and R5 is hydrogen.

[0076] As shown in Samples 2-1 to 2-3 in Table 3, when the phosphorus atomic weight of the flame retardant is low, the flame retardancy can be enhanced by increasing the adhesion amount (3.0% owf). On the other hand, as shown in Sample 3 in Table 3, when the phosphorus atomic weight of the flame retardant is high, the flame retardancy becomes self-extinguishing even with a small adhesion amount (0.5% owf).

[0077] As shown in Samples 24-1 and 24-2 in Table 4, when the carbon number of R1, R2, and R3 in the general formula (1) is greater than 16, the phosphorus atomic weight of the flame retardant is less than 4% by weight. Therefore, even when the adhesion amount of the flame retardant was increased to 3.2% by weight, a flame retardancy performance higher than the slow combustion property could not be obtained.

[0078] From these facts, it can be seen that by including at least one selected from the group consisting of the first phosphate ester compound represented by the general formula (1) and the second phosphate ester compound represented by the general formula (2), a flame retardant processing agent that does not contain halogen and exhibits sufficient flame retardancy can be obtained.

[0079] Also, as shown in Samples 21 and 22 in Table 4, when using conventional guanidine phosphate or resorcinol bis(di-2,6-xylyl phosphate) as a flame retardant, there is a possibility of linting. In contrast, as shown in Samples 1-1 to 17 in Table 3, it can be seen that when using the first phosphate ester compound or the second phosphate ester compound as a flame retardant, linting can be effectively suppressed.

[0080] When R1, R2, R3, and R4 of Sample 1, Sample 2, Sample 3, and Sample 9 in Table 1 are linear alkyl groups having 12 to 16 carbon atoms, the first phosphate ester and the second phosphate ester compounds become solids at room temperature. Examples where R4 and R5 are linear alkyl groups are not included in Samples 1 to 17. However, even if R5 is hydrogen and R4 is a linear alkyl group, since the second phosphate ester is solid at room temperature, even if R4 and R5 are linear alkyl groups, the second phosphate ester compound becomes solid at room temperature.

[0081] On the other hand, as shown in Sample 4, Sample 12, etc., when R1, R2, R3, R4, and R5 are branched alkyl groups, the melting point decreases and the flame retardant becomes liquid at room temperature. The second phosphate ester compound is a monoester or a diester, and since the phosphorus atomic weight is higher than that of the first phosphate ester compound, the flame retardant can adjust the phosphorus atomic weight by containing the first phosphate ester compound and the second phosphate ester compound. At this time, the melting point can also change simultaneously.

[0082] As shown in Table 3, in the flame-retardant polyester-based synthetic fiber structures of Samples 1-1 to Sample 9, Sample 11, and Sample 12, thread breakage is suppressed to 5 or less places. In contrast, in Samples 21 to 23 using conventional flame retardants, thread breakage occurs at 10 or more places, and even in polyester-based synthetic fiber structures without flame-retardant processing, thread breakage occurs at 8 places. Therefore, according to the flame-retardant processing agent of this embodiment, it can be seen that the obtained flame-retardant polyester-based synthetic fiber structure exhibits an effect of preventing thread breakage without performing thread breakage prevention processing with wax, whether the flame retardant is liquid or solid.

[0083] Also, as is clear from comparing Sample 2 with Sample 4 and Sample 12, it can be seen that if the flame retardant is solid, it can exhibit a higher thread breakage prevention effect than when it is liquid. Furthermore, as can be seen from the comparison between Sample 4 and Sample 10, it can be seen that adding wax to the flame-retardant processing agent can enhance the thread breakage prevention effect even more.

[0084] As shown in Sample 10 and Samples 14 to 17 of Table 3, when adding wax to the flame retardant processing agent, from the viewpoint of flame retardancy, it is preferable to use paraffin rather than rosin. Alternatively, when adding rosin to the flame retardant processing agent, in order to enhance the flame retardancy, it is preferable to increase the adhesion amount of the flame retardant compared to the case of using paraffin. For example, from the comparison between Sample 2-1 and Sample 2-3, or between Sample 7-1 and Sample 7-2, it can be understood that if the adhesion amount of the flame retardant is increased by about twice, the flame retardancy evaluation of the polyester-based synthetic fiber structure can be improved from flammability to self-extinguishability.

[0085] Also, from the viewpoint of preventing thread breakage, it is preferable that the melting point of paraffin is higher, and it is more preferably about 56 °C (130 °F) or higher.

[0086] Thus, according to the flame retardant processing agent for polyester-based synthetic fiber structures, the flame retardant polyester-based synthetic fiber structures, and the flame retardant processing method for polyester-based synthetic fiber structures of the present embodiment, excellent flame retardancy can be imparted to the polyester-based synthetic fiber structures, and the effect of preventing thread breakage during sewing can be achieved.

[0087] The flame retardant processing agent for polyester-based synthetic fiber structures, the flame retardant polyester-based synthetic fiber structures, and the flame retardant processing method for polyester-based synthetic fiber structures of the present disclosure can also be described as follows.

[0088] The flame retardant processing agent for polyester-based synthetic fiber structures according to the first configuration is a first phosphoric acid ester compound represented by the following general formula (1) (in formula (1), R1, R2, and R3 independently represent an alkyl group having 12 to 16 carbon atoms), and

Chemical formula

Chemical formula

[0089] The flame retardant processing agent for the polyester synthetic fiber structure according to the second configuration may have a phosphorus atomic weight in the flame retardant of 4.0% or more and 11.7% or less in the first configuration. By having a phosphorus atomic weight of 4.0% or more, an excellent flame retardant effect can be exhibited.

[0090] The flame retardant processing agent for the polyester synthetic fiber structure according to the third configuration, in the first configuration, at least one of the R1, R2, R 3、 R4 and R5 may be a linear alkyl group having 12 to 16 carbon atoms. Since the alkyl group is linear, the phosphate ester compound becomes solid at room temperature, and it is possible to suppress the fiber from breaking during sewing. It is not necessary to separately apply a smoothing agent that improves the sewability to the fiber structure.

[0091] The flame retardant processing agent for the polyester synthetic fiber structure according to the fourth configuration, in the first configuration, at least one of the R1, R2, R 3、 R4 and R5 may be a branched alkyl group having 12 to 16 carbon atoms. Since the alkyl group is branched, the raw material is inexpensive and the manufacturing cost can be reduced.

[0092] The flame retardant processing agent for the polyester synthetic fiber structure according to the fifth configuration may have a melting point of the flame retardant of 35°C or higher in the first configuration. Since the flame retardant is solid at room temperature, the flame retardant can also function as a wax during flame retardant processing, and it is possible to suppress the fiber from breaking. Since it is not necessary to separately apply wax to the fiber, the effect of the flame retardant can be enhanced.

[0093] The flame retardant finishing agent for the polyester synthetic fiber structure according to the sixth configuration, in the first configuration, the flame retardant contains the first phosphate ester compound, and R1, R2, and R3 may independently be linear alkyl groups having 12 to 16 carbon atoms. Since R1, R2, and R3 are linear alkyl groups having 12 to 16 carbon atoms, the flame retardant becomes solid at normal temperature.

[0094] The flame retardant finishing agent for the polyester synthetic fiber structure according to the seventh configuration, in the first configuration, the flame retardant may contain the first phosphate ester compound and the second phosphate ester compound. Since the second phosphate ester compound has a higher phosphorus content than the first phosphate ester compound, the flame retardant effect can be enhanced by including the second phosphate ester compound. If the alkyl group of the first phosphate ester is linear, an effect of preventing yarn breakage can also be obtained.

[0095] The flame retardant finishing agent for the polyester synthetic fiber structure according to the eighth configuration, in the first configuration, the first phosphate ester compound may be at least one selected from the group consisting of tridodecyl phosphate, tritridecyl phosphate, tritetradecyl phosphate, tripentadecyl phosphate, trihexadecyl phosphate, and triisotridecyl phosphate.

[0096] The flame retardant finishing agent for the polyester synthetic fiber structure according to the ninth configuration, in the first configuration, the second phosphate ester compound may be at least one selected from the group consisting of dodecan-1-yl dihydrogen phosphate, tridecan-1-yl dihydrogen phosphate, tetradecan-1-yl dihydrogen phosphate, pentadecan-1-yl dihydrogen phosphate, hexadecan-1-yl dihydrogen phosphate, didodecan-1-yl hydrogen phosphate, ditridecan-1-yl hydrogen phosphate, ditetradecan-1-yl hydrogen phosphate, dipentadecan-1-yl hydrogen phosphate, dihexadecan-1-yl hydrogen phosphate, isotridecan-1-yl dihydrogen phosphate, and diisotridecan-1-yl hydrogen phosphate.

[0097] The flame retardant finishing agent for the polyester synthetic fiber structure according to the tenth configuration, in the first configuration, further contains a nonionic surfactant and / or an anionic surfactant and water, and the flame retardant may be dispersed or emulsified in the water.

[0098] The flame retardant finishing agent for the polyester synthetic fiber structure according to the eleventh configuration, in the first configuration, further contains a pH adjuster containing at least one selected from the group consisting of ammonia and alkanolamine, and the flame retardant may contain the second phosphate ester compound.

[0099] The flame retardant finishing agent for the polyester synthetic fiber structure according to the twelfth configuration, in the first configuration, may further contain wax. Since paraffin is contained in the flame retardant finishing agent, there is no need to perform separate thread break prevention processing.

[0100] The flame retardant finishing agent for the polyester synthetic fiber structure according to the thirteenth configuration, in the twelfth configuration, the wax may be paraffin.

[0101] The flame-retardant polyester synthetic fiber structure according to the 14th configuration includes a polyester synthetic fiber structure and the flame retardant contained in the flame-retardant processing agent for the polyester synthetic fiber structure according to any one of the 1st to 13th configurations, and the flame retardant carried on the polyester synthetic fiber structure. According to this configuration, compared with the case of using water-soluble salts such as guanidine phosphate, the sticking of the flame-retardant processed polyester synthetic fiber structure is suppressed. When the phosphate ester compound is solid, it also has an effect of preventing yarn breakage.

[0102] The flame-retardant processing agent for the polyester synthetic fiber structure according to the 15th configuration includes a polyester synthetic fiber structure and the flame retardant contained in the flame-retardant processing agent for the polyester synthetic fiber structure according to any one of the 1st to 11th configurations, and the flame retardant carried on the polyester synthetic fiber structure, and does not contain wax. Since it does not contain paraffin for preventing yarn breakage, the addition amount of the phosphate ester compound can be small, and the texture of the fiber structure can be improved.

[0103] The flame-retardant processing method for the polyester synthetic fiber structure according to the 16th configuration is to carry the flame retardant on the polyester synthetic fiber structure using the flame-retardant processing agent for the polyester synthetic fiber structure according to any one of the 1st to 13th configurations.

[0104] The flame-retardant processing method for the polyester synthetic fiber structure according to the 17th configuration may be to apply the flame retardant to the polyester synthetic fiber structure in a proportion of 0.1% by weight or more and 10% by weight or less in the 16th configuration.

[0105] The flame-retardant processing method for the polyester synthetic fiber structure according to the 18th configuration may be to heat-treat the polyester synthetic fiber structure at a temperature of 100°C to 170°C after carrying the at least one phosphate ester compound on the polyester synthetic fiber structure in the 16th configuration.

Industrial Applicability

[0106] The flame retardant treating agent for polyester synthetic fiber structures, the flame retardant polyester synthetic fiber structures, and the method for flame retarding polyester synthetic fiber structures of the present disclosure are suitably used for polyester synthetic fiber structures for various applications.

Claims

1. The first phosphate ester compound represented by the following general formula (1) (in formula (1), R １ , R ２ , R ３ each independently represents an alkyl group having 12 to 16 carbon atoms.), and, 【Chemical 1】 The second phosphoric ester compound represented by the following general formula (2) (in formula (2), R ４ represents an alkyl group having 12 to 16 carbon atoms, and R ５ represents an alkyl group having 12 to 16 carbon atoms or hydrogen). [Chemical Formula 2] A flame retardant finishing agent for a polyester synthetic fiber structure, comprising at least one selected from the group consisting of

2. The flame retardant finishing agent for a polyester synthetic fiber structure according to Claim 1, wherein the phosphorus atomic weight in the flame retardant is 4.0% or more and 11.7% or less.

3. Said R １ , R ２ , R ３、 R ４ and R ５ At least one of which is a linear alkyl group having 12 to 16 carbon atoms, the flame retardant processing agent for a polyester synthetic fiber structure according to claim 1.

4. Said R １ , R ２ , R ３、 R ４ and R ５ At least one of which is a branched alkyl group having 12 to 16 carbon atoms, the flame retardant processing agent for the polyester synthetic fiber structure according to claim 1.

5. The flame retardant finishing agent for a polyester synthetic fiber structure according to Claim 1, wherein the melting point of the flame retardant is 35°C or higher.

6. The flame retardant contains the first phosphoric acid ester compound, and the R １ , R ２ , R ３ are each independently a linear alkyl group having 12 to 16 carbon atoms. The flame retardant finishing agent for the polyester synthetic fiber structure according to claim 1.

7. The flame retardant finishing agent for a polyester synthetic fiber structure according to Claim 1, wherein the flame retardant contains the first phosphate ester compound and the second phosphate ester.

8. The flame retardant finishing agent for a polyester synthetic fiber structure according to Claim 1, wherein the first phosphate ester compound is at least one selected from the group consisting of tridodecyl phosphate, tritridecyl phosphate, tritetradecyl phosphate, tripentadecyl phosphate, trihexadecyl phosphate, and triisotridecyl phosphate.

9. The flame retardant finishing agent for a polyester synthetic fiber structure according to Claim 1, wherein the second phosphate ester compound is at least one selected from the group consisting of dodecan-1-yl dihydrogen phosphate, tridecan-1-yl dihydrogen phosphate, tetradecan-1-yl dihydrogen phosphate, pentadecan-1-yl dihydrogen phosphate, hexadecan-1-yl dihydrogen phosphate, didodecan-1-yl hydrogen phosphate, ditridecan-1-yl hydrogen phosphate, ditetradecan-1-yl hydrogen phosphate, dipentadecan-1-yl hydrogen phosphate, dihexadecan-1-yl hydrogen phosphate, isotridecan-1-yl dihydrogen phosphate, and diisotridecan-1-yl hydrogen phosphate.

10. A nonionic surfactant and / or an anionic surfactant, and water, further comprising, wherein the flame retardant is dispersed or emulsified in the water, the flame retardant finishing agent for a polyester synthetic fiber structure according to Claim 1.

11. Further comprising a pH adjuster containing at least one selected from the group consisting of ammonia and alkanolamine, The flame retardant finishing agent for a polyester synthetic fiber structure according to Claim 1, wherein the flame retardant contains the second phosphate ester compound.

12. A flame retardant finishing agent for a polyester synthetic fiber structure according to claim 4, further containing wax.

13. A flame retardant finishing agent for a polyester synthetic fiber structure according to claim 12, wherein the wax is paraffin.

14. A polyester synthetic fiber structure, The flame retardant contained in the flame retardant finishing agent for a polyester synthetic fiber structure according to any one of claims 1 to 13, wherein the flame retardant is carried on the polyester synthetic fiber structure, A flame-retardant polyester synthetic fiber structure comprising the same.

15. A polyester synthetic fiber structure, The flame retardant contained in the flame retardant finishing agent for a polyester synthetic fiber structure according to any one of claims 1 to 11, wherein the flame retardant is carried on the polyester synthetic fiber structure, Comprising, A flame-retardant polyester synthetic fiber structure that does not contain wax.

16. A method for flame-retardant finishing of a polyester synthetic fiber structure, wherein the flame retardant is carried on the polyester synthetic fiber structure using the flame retardant finishing agent for a polyester synthetic fiber structure according to any one of claims 1 to 13.

17. The method for flame-retardant finishing of a polyester synthetic fiber structure according to claim 16, wherein the flame retardant is applied to the polyester synthetic fiber structure at a ratio of 0.1% by weight or more and 10% by weight or less.

18. The method for flame-retardant finishing of a polyester synthetic fiber structure according to claim 16, wherein after the at least one phosphate ester compound is carried on the polyester synthetic fiber structure, the polyester synthetic fiber structure is heat-treated at a temperature of 100°C to 170°C.

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