JP3845020B2 - Thermoplastic resin fiber with excellent flame resistance - Google Patents

Description

（式中、Ｒ_３は炭素原子数１〜１０のアルキル基または水素原子を表し、Ｒ_４は炭素原子数５〜１０のシクロアルキル基または炭素原子数１〜４のアルキル基で置換された炭素原子数５〜１０のシクロアルキル基を表す。）
【０００６】
【発明の実施の形態】
本発明に使用される熱可塑性樹脂としては、ポリオレフィン、ナイロン、ポリエステル等が挙げられる。ポリオレフィンとしては、具体的には、高密度ポリエチレン、中密度ポリエチレン、低密度ポリエチレン、直鎖状低密度ポリエチレン、メタロセン触媒を用いて製造されたエチレン・α−オレフィン共重合体などのポリエチレン系樹脂や、プロピレン単独重合体、エチレン−プロピレンブロック共重合体、エチレン−プロピレンランダム共重合体などのポリプロピレン系樹脂などが挙げられるが、これらのうちでは、延伸効果にすぐれた、高密度ポリエチレン、プロピレン単独重合体などが好ましい。
【０００７】
本発明に使用される難燃剤としては、下記一般式(１)で示される窒素含有化合物が用いられる。
Ｈ(Ｒ_１)Ｎー(ＣＨ_２)_ａーＮ(Ｒ_２)ー(ＣＨ_２)_ｂーＮ(Ｒ_２’)ー（ＣＨ_２)_ｃーN(Ｒ_１)Ｈ (１)
（式中、Ｒ_１は下記一般式(２)で示されるピペリジル基を含有するトリアジン誘導体基であり、Ｒ_２、Ｒ_２’は Ｒ_１または水素原子を表し、ａ，ｂ及びｃはそれぞれ、２〜５の正数を表す。）
【化４】

（式中、Ｒ_３は炭素原子数１〜１０のアルキル基または水素原子を表し、Ｒ_４は炭素原子数５〜１０のシクロアルキル基または炭素原子数１〜４のアルキル基で置換された炭素原子数５〜１０のシクロアルキル基を表す。）
【０００８】
上記一般式(１)で示される窒素含有化合物として、下記一般式(３)で示される窒素含有化合物が好ましく、特に下記一般式(３)と下記一般式(４)の組み合わせのものが好ましい。
Ｈ(Ｒ_１)Ｎー(ＣＨ_２)_３ーＮ(Ｒ_１)ー(ＣＨ_２)_２ーＮHー（ＣＨ_２)_３ーN(Ｒ_１)Ｈ (３)
即ち、上記一般式(３)で示される窒素含有化合物は、上記一般式(１)において、Ｒ_１が上記一般式(２)で示されるピペリジル基を含有するトリアジン誘導体基であり、Ｒ_２ がＲ_１であり、Ｒ_２’が水素原子であり、ａ，ｂ及びｃがそれぞれ、３，２，３の正数である窒素含有化合物である。
【化５】

また、上記一般式(４)で示されるものは、上記一般式(１)または(３)のＲ_１を示すものであり、上記一般式(２)のＲ_３が炭素原子数４のブチル基であり、Ｒ_４が炭素原子数６のシクロヘキシル基であるピペリジル基を含有するトリアジン誘導体基である。
【０００９】
本発明においては、上記熱可塑性樹脂に対して上記難燃剤を所望量配合し、溶融混練して使用する。上記難燃剤は熱可塑性樹脂の加工温度領域で融点を有し、熱可塑性樹脂に相溶するので、成形品の繊維製品の透明性は良好である。即ち、従来の難燃剤は融点が高く、熱可塑性樹脂に分散させて白濁したものを多量に用いているのに比べ、本発明の難燃剤は熱可塑性樹脂に相溶しているので、該繊維製品の透明性は著しく改善される。
上記難燃剤の配合割合は、熱可塑性樹脂に対して０．１〜５重量％、好ましくは０．５〜４重量％の範囲である。 上記配合量が上記範囲未満では難燃性が不十分であり、上記範囲を超えると難燃性の効果がそれ以上向上せず、逆にコストアップにつながるので好ましくない。
【００１０】
本発明の熱可塑性樹脂繊維体の形態としては、フィルムをスリットして延伸したフラットヤーンや、フラットヤーンを割繊したスプリットヤーン、また円形または異形ノズルから押し出したフィラメントを延伸したモノフィラメントや、低繊度フィラメントを収束したマルチフィラメントなどの単層型あるいは多層型、芯鞘型、並列型等の複合糸条など制限なく採用される。
【００１１】
上記熱可塑性樹脂繊維体の形態として、モノフィラメントを一例にして以下に説明すると、その成形方法は、特に限定されるものではなく、公知のモノフィラメントの成形方法が採用される。すなわち、モノフィラメント成形ダイスを用い、前記樹脂組成物を溶融押出し、次いで冷却固化した後、所定温度で延伸し、弛緩熱処理を施してモノフィラメントを形成することができる。上記延伸倍率は２〜１５倍の範囲が望ましい。延伸方法は一段延伸または二段延伸以上の多段延伸が可能である。
【００１２】
上記モノフィラメントの用途として、工事用メッシュシートの場合には、上記モノフィラメントを経緯糸として用いて織成または編成してメッシュ状とした織編布である。織編布の組織としては、特に限定されるものではなく、織物では、例えば、平織、綾織、模紗織、絽織、絡み織などが挙げられ、編物ではラッセル編、トリコット編み、ミラニーズ編等が挙げられる。上記モノフィラメントの繊度は、１００〜３０００デシテクス（以下、dtと略記する）の範囲、望ましくは２００〜２０００dtの範囲である。また、上記経緯糸の打込密度は通常５〜７０本／２.５４ｃｍ、望ましくは１０〜５０本／２.５４ｃｍの範囲である。
【００１３】
こうして得られたメッシュ状織編布は粗目を有し、通気性を有するものであればに特に限定されることはない。建築工事用メッシュシートとしては目あき状態を示す空隙率が通常５〜６０％、好ましくは１０〜４０％の範囲であり、日本工業規格ＪＩＳＡ８９５２で網目寸法が１２ｍｍ以下となっており、建築工事用メッシュシートとしての目的、用途により選定される。目付け量は、通常６０〜６００ｇ／ｍ^２、好ましくは１００〜５００ｇ／ｍ^２の範囲である。
【００１４】
上記メッシュ状織編布は、所定寸法に裁断され、周縁の折り返し加工や鳩目を打設するなどによって建築工事用メッシュシートとなるが、ＪＩＳＡ８９５２に規定する防炎性規格に合格する性能を有しているものが好ましい。
【００１５】
また、建築工事用メッシュシートはいずれも屋外で使用され、長期間日光に晒されるために高い耐候性が必要とされている。本発明で用いる難燃剤は、ピペリジル基を有するトリアジン誘導体であり、それ自身がヒンダードアミン系の光安定剤として働くため、非常に高い耐候性を有する。さらに、耐候性を改良する方法としては、紫外線吸収剤や光安定剤等の耐候剤を添加する方法を採用することもできる。
【００１６】
紫外線吸収剤の具体例としては、具体的には２-エチルヘキシル-２-シアノ-３,３’−ジフェニルアクリレート、エチル-２-シアノ-３,３’-ジフェニルアクリレート、オクチル-２-シアノ-３,３’-ジフェニルアクリレート等のシアノアクリレート系紫外線吸収剤、２,４-ジヒドロキシベンゾフェノン、２-ヒドロキシ-４-メトキシベンゾフェノン、２-ヒドロキシ-４-オクトキシベンゾフェノン等のベンゾフェノン系紫外線吸収剤、２-（２′-ヒドロキシ -５′-メチルフェニル）ベンゾトリアゾール、２-（２′-ヒドロキシ-５′-t-オクチルフェニル）ベンゾトリアゾール等のベンゾトリアゾール系紫外線吸収剤、レゾルシノールモノベンゾエート、２,４-ジ-t-ブチルフェニル-３′-５′-ジ-t-ブチル-４′-ヒドロキシベンゾエート等のベンゾエート系紫外線吸収剤などが挙げられる。
【００１７】
ヒンダードアミン系光安定剤としては、ビス（２,２,６,６-テトラメチル-４-ピペリジル）セバケート、テトラキス（２,２,６,６-テトラメチル-４-ピペリジル）-１,２,３,４-ブタンテトラカルボキシレート、ビス（１,２,２,６,６-ペンタメチル-４-ピペリジル）・ジ（トリデシル）-１,２,３,４-ブタンテトラカルボキシレート、１-（２-ヒドロキシエチル）-２,２,６,６-テトラメチル-４-ピペリジノールとコハク酸ジエチルの重縮合物等が挙げられる。
【００１８】
本発明の熱可塑性樹脂には、本発明の趣旨を逸脱しない範囲において、酸化防止剤、分散剤、滑剤、帯電防止剤、顔料、無機充填剤、架橋剤、発泡剤、核剤等の通常用いられる添加剤を配合してもよい。
【００１９】
【実施例】
実施例１：
ポリプロピレン（ＭＦＲ＝２．０ｇ／１０ｍｉｎ.、密度＝０.９０ｇ／ｃｍ^３、Ｔｍ＝１６４℃）に上記一般式(３)及び一般式(４)で示されるものを組み合わせた窒素含有化合物からなる難燃剤を２重量％配合し、２００℃で溶融混練した組成物を用いて、モノフィラメント成形ダイスで溶融押出し、次いで冷却固化した後、延伸処理して繊度１５００dtの偏平モノフィラメントを成形した。この偏平モノフィラメントを経糸及び緯糸に用いて、打込密度２７×２７本／２．５４ｃｍで、模紗織でメッシュシートを形成した。得られたメッシュシートの目付け３２０ｇ／ｍ^２、空隙率１２％であった。
得られたメッシュシートは経方向に折畳み可能な柔軟性を有しており、取扱い性は良好であった。また、メッシュシートはＪＩＳＫ６７６０に準拠して測定した引張強度は１８５ｋｇ／３ｃｍであり、引張伸度は２２％であった。この値は、ＪＩＳＡ８９５２の建築工事用シート１類規格に合格するものである。難燃性試験では接炎回数は５回で、ＪＩＳＡ８９５２の防炎性規格に合格するものであった。
【００２０】
比較例１
実施例１において、難燃剤をメラミンシアヌレート（商品名：ＭＣ−６１０、日産化学株式会社製）に変え、ポリプロピレン１００重量部に対し、上記メラミンシアヌレート１０重量部を配合して行ったこと以外は同様にして行った。
その結果、得られたメッシュシートの難燃性試験では接炎回数は２回で、ＪＩＳＡ８９５２の防炎性規格に不合格であった。
なお、上記防炎性規格に合格するのに必要なメラミンシアヌレートの配合量はポリプロピレン１００重量部に対し、３０重量部必要であり、本発明で用いる難燃剤はわずか２重量％配合することで十分効果を有するのに比べ、大量添加しないと満足する難燃効果が得られないことがわかった。
【００２１】
【発明の効果】
以上説明したように、本発明の熱可塑性樹脂繊維は、熱可塑性樹脂に上記一般式（１）で示される窒素含有化合物からなる難燃剤を配合してなるものであって、ハロゲン系難燃剤やりん系難燃剤のように有毒ガスの発生の恐れがなく、かつ無機系難燃剤のように燃焼後の灰分の残存する恐れのなく、少量の配合することによって透明性、耐候性、柔軟性、機械的強力及び難燃性に優れた熱可塑性樹脂繊維を提供することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thermoplastic resin fiber excellent in flame retardancy. More specifically, the present invention relates to a thermoplastic resin fiber excellent in flame retardancy that is suitably used for applications such as fiber materials, interior materials, and automobile interior materials.
[0002]
[Prior art]
Fields where products are conventionally required to have flame retardancy, such as ropes, fishing nets, nets, tents, textile materials such as automobile hood sheets and sun tents, interior materials such as wallpaper and carpets, automotive interior materials and air In the field of filter materials such as filters and filter cloths, vinyl chloride products and halogen compounds as disclosed in JP-B-60-7722, JP-B-60-24205, or JP-B-61-44967 Many products using flame retardants are widely used.
[0003]
For example, a mesh sheet for construction is used in building construction sites that have scaffolds for building, house construction, etc., around the construction site and other parts necessary for prevention of harm, as scaffolding for prevention of damage due to falling objects, etc. Used by attaching to the outer peripheral surface of the temporary structure. For this reason, flameproofing standards are specified in Annex Table 1 of JIS A8952 “Sheeting for Construction Works” for building construction sheets, and various flame retardant treatments are usually applied to pass this. It is.
As a conventional construction sheet, a sheet woven and knitted in a net shape using a filament yarn obtained by blending a flame retardant with a thermoplastic resin such as polyolefin, polyester and nylon and using extrusion molding is used. As flame retardants, halogen flame retardants, phosphorus flame retardants and inorganic flame retardants such as magnesium hydroxide are generally known.
[0004]
[Problems to be solved by the invention]
However, the halogen-based flame retardant and the phosphorus-based flame retardant generate not only environmental pollution problems by generating toxic gases such as dioxins at the time of incineration, but also have problems such as corrosion of the apparatus due to corrosive gas. Therefore, in recent years, a method of adding a hydrate of an inorganic metal compound such as aluminum hydroxide or magnesium hydroxide as a non-polluting flame retardant that does not generate harmful gases during combustion, has low smoke properties (for example, special (Kaihei 2-53845, JP-A-2-145632, etc.) have been studied in various ways. However, if a large amount is not added, there is no effect, and inorganic flame retardants generate ash after incineration and clog the filter. There was a problem of causing trouble.
The present invention has been made paying attention to the above-mentioned problems, is excellent in weather resistance, mechanical strength and flexibility, does not generate toxic gas at the time of incineration, and has a flame retardancy without remaining ash An object is to provide resin fibers.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventor has found that the above object can be achieved by adding a small amount of a specific triazine derivative as a flame retardant, and the present invention has been completed. It came to do.
That is, the gist of the present invention is a fiber comprising a thermoplastic resin, wherein the thermoplastic resin is blended with a flame retardant comprising a nitrogen-containing compound represented by the following general formula (1). It exists in the thermoplastic resin fiber excellent in flammability.
H _{(R 1)} N over (CH _{2) a} chromatography N _{(R 2)} over (CH _{2) b} over N (R _{2 ')} over (CH _{2) c} over _{N (R 1) H (1} )
(In the formula, R ₁ is a triazine derivative group containing a piperidyl group represented by the following general formula (2), R _{2 and} R _{2 ′} represent R ₁ or a hydrogen atom, and a, b and c are respectively Represents a positive number from 2 to 5.)
[Chemical 3]

(In the formula, R ₃ represents an alkyl group having 1 to 10 carbon atoms or a hydrogen atom, and R ₄ represents carbon substituted with a cycloalkyl group having 5 to 10 carbon atoms or an alkyl group having 1 to 4 carbon atoms. Represents a cycloalkyl group having 5 to 10 atoms.)
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Examples of the thermoplastic resin used in the present invention include polyolefin, nylon, and polyester. Specific examples of polyolefins include high-density polyethylene, medium-density polyethylene, low-density polyethylene, linear low-density polyethylene, and polyethylene-based resins such as ethylene / α-olefin copolymers produced using a metallocene catalyst, Polypropylene resins such as propylene homopolymer, ethylene-propylene block copolymer, ethylene-propylene random copolymer, etc. Among these, high-density polyethylene, propylene Coalescence is preferred.
[0007]
As the flame retardant used in the present invention, a nitrogen-containing compound represented by the following general formula (1) is used.
H _{(R 1)} N over (CH _{2) a} chromatography N _{(R 2)} over (CH _{2) b} over N (R _{2 ')} over (CH _{2) c} over _{N (R 1) H (1} )
(In the formula, R ₁ is a triazine derivative group containing a piperidyl group represented by the following general formula (2), R _{2 and} R _{2 ′} represent R ₁ or a hydrogen atom, and a, b and c are respectively Represents a positive number from 2 to 5.)
[Formula 4]

(In the formula, R ₃ represents an alkyl group having 1 to 10 carbon atoms or a hydrogen atom, and R ₄ represents carbon substituted with a cycloalkyl group having 5 to 10 carbon atoms or an alkyl group having 1 to 4 carbon atoms. Represents a cycloalkyl group having 5 to 10 atoms.)
[0008]
As the nitrogen-containing compound represented by the general formula (1), a nitrogen-containing compound represented by the following general formula (3) is preferable, and a combination of the following general formula (3) and the following general formula (4) is particularly preferable.
H _{(R 1)} N over (CH _{2) 3} over N _{(R 1)} over (CH _{2) 2} over NH chromatography (CH _{2) 3} over _{N (R 1) H (3} )
That is, in the nitrogen-containing compound represented by the general formula (3), in the general formula (1), R ₁ is a triazine derivative group containing a piperidyl group represented by the general formula (2), and R ₂ is A nitrogen-containing compound in which R ₁ , R _{2 ′} is a hydrogen atom, and a, b, and c are positive numbers of 3, 2, and 3, respectively.
[Chemical formula 5]

Moreover, those represented by the general formula (4) shows the R ₁ in the general formula (1) or (3), R ₃ is a butyl group having 4 carbon atoms in the general formula (2) And R ₄ is a triazine derivative group containing a piperidyl group which is a cyclohexyl group having 6 carbon atoms.
[0009]
In the present invention, a desired amount of the flame retardant is blended with the thermoplastic resin and used after being melt-kneaded. Since the flame retardant has a melting point in the thermoplastic resin processing temperature region and is compatible with the thermoplastic resin, the transparency of the molded fiber product is good. That is, the conventional flame retardant has a high melting point, and the flame retardant of the present invention is compatible with the thermoplastic resin compared to the case where a large amount of the white turbid dispersion dispersed in the thermoplastic resin is used. The transparency of the product is significantly improved.
The blending ratio of the flame retardant is in the range of 0.1 to 5% by weight, preferably 0.5 to 4% by weight with respect to the thermoplastic resin. If the blending amount is less than the above range, the flame retardancy is insufficient, and if it exceeds the above range, the flame retardancy effect is not further improved, and conversely, the cost is increased, which is not preferable.
[0010]
The form of the thermoplastic resin fiber body of the present invention includes a flat yarn obtained by slitting a film, a split yarn obtained by splitting a flat yarn, a monofilament obtained by drawing a filament extruded from a circular or deformed nozzle, and a low fineness. A single-layer type such as a multifilament with converged filaments, or a composite yarn such as a multi-layer type, a core-sheath type, or a parallel type is used without limitation.
[0011]
As a form of the thermoplastic resin fiber body, a monofilament will be described below as an example. The molding method is not particularly limited, and a known monofilament molding method is employed. That is, using a monofilament molding die, the resin composition can be melt-extruded, then cooled and solidified, then stretched at a predetermined temperature, and subjected to relaxation heat treatment to form a monofilament. The draw ratio is preferably in the range of 2 to 15 times. As the stretching method, single-stage stretching or multi-stage stretching of two or more stages is possible.
[0012]
In the case of a construction mesh sheet, the monofilament is a woven or knitted fabric woven or knitted using the monofilament as a warp and knitted into a mesh shape. The structure of the woven or knitted fabric is not particularly limited, and examples of the woven fabric include plain weave, twill weave, imitation weave, leopard weave, woven fabric, etc. Can be mentioned. The fineness of the monofilament is in the range of 100 to 3000 dtex (hereinafter abbreviated as dt), preferably in the range of 200 to 2000 dt. The weft density of the warp and weft yarns is usually in the range of 5 to 70 / 2.54 cm, preferably 10 to 50 / 2.54 cm.
[0013]
The mesh-like woven or knitted fabric thus obtained is not particularly limited as long as it has a coarse texture and air permeability. As a mesh sheet for construction work, the porosity indicating the open state is usually in the range of 5 to 60%, preferably 10 to 40%, and the mesh size is 12 mm or less according to Japanese Industrial Standard JIS A8952. It is selected according to the purpose and use as a mesh sheet. The basis weight is usually 60 to 600 g / m ² , preferably 100 to 500 g / m ² .
[0014]
The mesh-shaped woven or knitted fabric is cut into a predetermined size and becomes a mesh sheet for construction work by folding the peripheral edge or placing an eyelet, etc., but has the ability to pass the flameproof standard specified in JIS A8952. Are preferred.
[0015]
Moreover, since all the mesh sheets for construction work are used outdoors and are exposed to sunlight for a long time, high weather resistance is required. The flame retardant used in the present invention is a triazine derivative having a piperidyl group, and itself has a very high weather resistance because it functions as a hindered amine light stabilizer. Furthermore, as a method for improving the weather resistance, a method of adding a weather resistance agent such as an ultraviolet absorber or a light stabilizer may be employed.
[0016]
Specific examples of the ultraviolet absorber include 2-ethylhexyl-2-cyano-3,3′-diphenyl acrylate, ethyl-2-cyano-3,3′-diphenyl acrylate, and octyl-2-cyano-3. Cyanoacrylate UV absorbers such as 3,3'-diphenyl acrylate, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, benzophenone UV absorbers such as 2-hydroxy-4-octoxybenzophenone, 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, benzotriazole UV absorbers such as 2- (2'-hydroxy-5'-t-octylphenyl) benzotriazole, resorcinol monobenzoate, 2,4- Benzoate UV absorption such as di-t-butylphenyl-3'-5'-di-t-butyl-4'-hydroxybenzoate Agents and the like.
[0017]
Examples of hindered amine light stabilizers include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate and tetrakis (2,2,6,6-tetramethyl-4-piperidyl) -1,2,3. , 4-butanetetracarboxylate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) di (tridecyl) -1,2,3,4-butanetetracarboxylate, 1- (2- (Hydroxyethyl) -2,2,6,6-tetramethyl-4-piperidinol and polycondensate of diethyl succinate.
[0018]
In the thermoplastic resin of the present invention, an antioxidant, a dispersant, a lubricant, an antistatic agent, a pigment, an inorganic filler, a cross-linking agent, a foaming agent, a nucleating agent and the like are usually used without departing from the spirit of the present invention. Additives may be blended.
[0019]
【Example】
Example 1:
It consists of a nitrogen-containing compound that combines polypropylene (MFR = 2.0 g / 10 min., Density = 0.90 g / cm ³ , Tm = 164 ° C.) with those represented by the above general formulas (3) and (4). A composition obtained by blending 2% by weight of a flame retardant and melt-kneaded at 200 ° C. was melt-extruded with a monofilament molding die, then cooled and solidified, and then stretched to form a flat monofilament having a fineness of 1500 dt. This flat monofilament was used for warp and weft to form a mesh sheet with a pattern density of 27 × 27 / 2.54 cm. The obtained mesh sheet had a basis weight of 320 g / m ² and a porosity of 12%.
The obtained mesh sheet had flexibility that could be folded in the warp direction, and was easy to handle. The mesh sheet had a tensile strength of 185 kg / 3 cm and a tensile elongation of 22% as measured in accordance with JISK6760. This value passes the JIS A8952 building construction sheet 1 class standard. In the flame retardancy test, the number of times of flame contact was 5 and passed the flameproof standard of JIS A8952.
[0020]
Comparative Example 1
In Example 1, the flame retardant was changed to melamine cyanurate (trade name: MC-610, manufactured by Nissan Chemical Co., Ltd.), and 10 parts by weight of the above melamine cyanurate was blended with 100 parts by weight of polypropylene. Was done in the same way.
As a result, in the flame retardancy test of the obtained mesh sheet, the number of times of flame contact was 2, which failed the flame retardant standard of JIS A8952.
The blending amount of melamine cyanurate necessary to pass the flameproof standard is 30 parts by weight with respect to 100 parts by weight of polypropylene, and the flame retardant used in the present invention is blended by only 2% by weight. It has been found that a satisfactory flame retardant effect cannot be obtained unless a large amount is added, compared with a sufficient effect.
[0021]
【The invention's effect】
As described above, the thermoplastic resin fiber of the present invention is obtained by blending a thermoplastic resin with a flame retardant composed of a nitrogen-containing compound represented by the above general formula (1). Transparency, weather resistance, flexibility, by blending a small amount without the risk of generation of toxic gas like a flame retardant and no fear of ash remaining after combustion like an inorganic flame retardant A thermoplastic resin fiber excellent in mechanical strength and flame retardancy can be provided.

Claims (4)

A thermoplastic resin excellent in flame retardancy, characterized in that it is a fiber made of a thermoplastic resin, comprising a flame retardant comprising a nitrogen-containing compound represented by the following general formula (1) in the thermoplastic resin: fiber.
H _{(R 1)} N over (CH _{2) a} chromatography N _{(R 2)} over (CH _{2) b} over N (R _{2 ')} over (CH _{2) c} over _{N (R 1) H (1} )
(In the formula, R ₁ is a triazine derivative group containing a piperidyl group represented by the following general formula (2), R _{2 and} R _{2 ′} represent R ₁ or a hydrogen atom, and a, b and c are respectively Represents a positive number from 2 to 5.)

(In the formula, R ₃ represents an alkyl group having 1 to 10 carbon atoms or a hydrogen atom, and R ₄ represents carbon substituted with a cycloalkyl group having 5 to 10 carbon atoms or an alkyl group having 1 to 4 carbon atoms. Represents a cycloalkyl group having 5 to 10 atoms.) The thermoplastic resin fiber excellent in flame retardancy according to claim 1, wherein the blending amount of the flame retardant is in the range of 0.1 to 5% by weight with respect to the thermoplastic resin. The thermoplastic resin fiber excellent in flame retardancy according to claim 1, wherein the thermoplastic resin is a polyolefin resin. The thermoplastic resin fiber excellent in flame retardancy according to claim 1, wherein the flame retardant is a nitrogen-containing compound represented by the following general formula (3).
H _{(R 1)} N over (CH _{2) 3} over N _{(R 1)} over (CH _{2) 2} over NH chromatography (CH _{2) 3} over _{N (R 1) H (3} )
(In the formula, R ₁ is a triazine derivative group containing a piperidyl group represented by the following general formula (4).)