JP3895808B2

JP3895808B2 - Brush hair

Info

Publication number: JP3895808B2
Application number: JP26223196A
Authority: JP
Inventors: 則徳山; 光幸漆谷
Original assignee: Kowa Co Ltd
Current assignee: Kowa Co Ltd
Priority date: 1996-08-26
Filing date: 1996-08-26
Publication date: 2007-03-22
Anticipated expiration: 2016-08-26
Also published as: JPH1057145A

Description

【０００１】
【発明の属する技術分野】
本発明は自動車のボデーや、器具物品等の洗浄に適したブラシ用毛材に関する。
【０００２】
【従来の技術】
従来ブラシ用毛材は、種々の形状をした異型断面モノフィランメントが多く用いられて来た。特に自動車ボデー洗浄の場合、ボデー表面の傷付きを少なくするため、異型断面モノフィランメントの先端を長手方向に細分割して毛材として用いられて来た。しかし最近の自動車洗車の高速化にともない、自動車ボデー表面への傷付きを極力少なく、かつ洗浄力を高める要請がある。この要請に答えるためには、自動車ボデーに最初に接触し、ボデー表面に傷付ける事なく、洗浄効果を発揮する毛材の細分割部の形状が重要な要素となる。
【０００３】
従来、毛材に用いられて来た異型断面モノフィラメントは、三角形、五角形等のマルチローバルと言われるものか、又は、Ｙ字型、十字型、卍型、さらに、特開平１−２３９１０７並びに実公平５−４２７４２で提案されている、主幹をもち、主幹から放射状に伸びる複数の突出辺をもつものである。
これを一定条件で、長手方向に細分割すると、例えば、図２（Ａ）が示す十字断面の場合、図２（Ｂ）の状態となる。即ち、主幹７を中心とした太い繊維９とちぢれた状態の細い繊維９ａになる。ちぢれた繊維９ａの横断面並びにその方向が全く不揃いである。この状態の毛材を用いて高速にて自動車洗浄を行うと、主幹７を中心とした太い繊維９が自動車のボデー表面に強く当たり、ちぢれた状態の細い繊維９ａは、ほとんど当たらない。その結果、均一な洗浄が出来ない。また、主幹を中心とした太い繊維９は柔軟性に乏しく、自動車ボデーを傷付けることとなる。
【０００４】
又、特開平１−２７８５７２では、図３に示すように、帯状のブラシ材の表面に長手方向に沿う樋状の保水溝を多数列に形成し、先端部を長手方向に細分割したブラシ用毛材が提案されているが、この場合も、横断面が巾方向に不均一な厚さを有する事から、細分割された状態は、十字型と同様、太い繊維と細い繊維との混合状態となる。従って洗浄性能は、十字型の場合と同じように、良い結果は期待出来ない。
【０００５】
実開平１−９７７３１、実開平３−１１８３５、特開平６−２２８１５に於いて、熱可塑性エラストマーをブラシ用毛材として、又特開平６−１２８８１４に於いて、ポリエステルエラストマーを産業資材用に用いた報告がなされている。熱可塑性エラストマーは、粘着性があり、熱可塑性樹脂に比較して、熱に対して寸法安定性も悪い。特に粘着性があるモノフィラメントは細分割加工性が悪く、ブラシ用毛材として用いることは出来ない。これらは熱可塑性エラストマー１００％、又は、熱可塑性エラストマーを鞘成分に、熱可塑性樹脂を芯成分なる芯鞘構成に成型したモノフィラメントであるが、強い粘着性を発現し、熱に対する寸法安定性も悪い事から、特に洗車用ブラシ毛材としては、いずれも不適である。以上の事から現在用いられる異型断面モノフィラメントを長手方向に細分割した毛材では、不十分であり、又熱可塑性エラストマーを用いて、適正なるブラシ用毛材にする事は成されていない。
【０００６】
【発明が解決しようとする課題】
本発明は、自動車のボデーや器具物品等の洗浄に於いて、被洗浄面を傷つける事なく、極めて洗浄性が良好でしかも形状安定性に優れたブラシ用毛材を提供することを目的とする。
【０００７】
【課題を解決するための手段】
本発明のブラシ用毛材は、上記の目的を達成するため、次の手段を採った。すなわち、エチレン−αオレフィン共重合体熱可塑性エラストマー又はスチレン・エチレンブロック共重合体熱可塑性エラストマーのいずれか一方０．５〜４０重量部と、低密度ポリエチレン又は直鎖状低密度ポリエチレンのいずれか一方あるいは低密度ポリエチレンと直鎖状低密度ポリエチレンを混合したもの６０〜９９．５重量部とを配合した樹脂組成物からなる長尺板状の毛材であって、太さ３０００〜８０００デニールで巾方向にうねり１を有し、長手方向の先端部に細分割加工を施して細分割毛６ａを形成したことを特徴としている。
【０００８】
【実施例】
以下本発明の実施例を図面に基づいて説明する。
図１（Ａ）は、ブラシ用毛材の横断面図である。うねり１を引き伸ばすと四辺形となり、うねりの始まる端面２と、うねりの終わる端面３は、うねりの高さｈの中に入るのが好ましい。また、うねりピッチＬが少なくとも１．５個以上連なっていることが望ましい。うねり１は、波状となし、うねりの谷間４は保水溝となる。洗浄水の流れはうねり自体が波状でつながっているので巾方向に乗り越えやすい。従って自動車ボデーと毛材との接触界面に均一なる洗浄液層が形成され、優れた洗浄効果が期待出来る。
【０００９】
また、図１（Ｂ）はブラシ用毛材１の先端部をあらわしたものである。毛材の細分割部６は横断面並びに太さがほぼ同一繊維で構成されている。この細分割毛の長さＫａも一定、細分割毛６ａの向きも揃っている。この様に細分割毛６ａが均一に揃う理由は、本発明の一本の毛材に於いてうねりを形成する断面の厚みがほぼ一定ゆえ、細分割加工機での細分割刃の分割長がほぼ同一となり、その結果細分割刃の分割圧力が当横断面の巾方向に均一にかかるためである。
【００１０】
本発明の熱可塑性エラストマーを用いた毛材５の樹脂組成は、エチレン−αオレフィン共重合体熱可塑性エラストマー又はスチレン・エチレンブロック共重合体熱可塑性エラストマーのいずれか一方０．５〜４０重量部と、低密度ポリエチレン又は直鎖状低密度ポリエチレンのいずれか一方あるいは低密度ポリエチレンと直鎖状低密度ポリエチレンを混合したもの６０〜９９．５重量部とを配合したものである。
【００１１】
更に、この配合１００重量部に対して、滑剤を０．２〜５重量部、紫外線吸収剤を０．２〜０．８重量部添加してもよい。又、無機顔料等着色剤を添加してもよい。
【００１２】
この配合を溶融押出成型法によって、図１（Ａ）に示すような横断面をもつフィラメントを成型し、長手方向にて細分割加工を行った。細分割状況は、図１（Ｂ）に示すように、細分割部６は、横断面形状並びに太さがほぼ同一の細分割毛６ａで構成され、かつ細分割毛の長さＫａも一定なる緻密な構造のものが得られた。また、この毛材を洗車用ブラシに組み立て、自動車洗車機に組み入れて、高速にて洗車を行った結果、細分割毛の長さＫａが拡大せず、また、細分割部６の細分割毛６ａの破損がほとんど見られない、特筆すべき極めて優れた機能があった。さらに、この毛材は熱に対する寸法安定性に優れ、柔軟にて、弾力性並びに着色、鮮明性のあるものであった。これは、エチレン−αオレフィン共重合体熱可塑性エラストマー、もしくはスチレン−エチレンブロック共重合体熱可塑性エラストマーが、低密度ポリエチレン、または、直鎖状低密度ポリエチレン中に極めて均一にミクロ分散し、安定な構造をとるに適した条件となっているためと思われる。なお、エチレン−αオレフィン共重合体熱可塑性エラストマーを低密度ポリエチレンに４０重量部以上配合したモノフィラメントでは、徐々に粘着性が発現、７０重量部以上になると、粘着性の発現が顕著となり、細分割加工が出来なくなる。また、押し出し成型にて安定なモノフィラメントの形成も出来ない。一方、０．５重量部以下では上記に示す、高速にて洗車をおこなった後の毛材の細分割部６の安定性向上に寄与しない。
【００１３】
削除
【００１４】
さらに、この毛材の太さは、３０００〜８０００デニールである。
【００１５】
次に試験した内容について説明する。
毛材細分割部６，８の細分割状況の判定、毛材の熱に対する寸法安定性、被洗浄物への損傷度、並びに、毛材形状の安定性を次の実験法で判定した。
(1)毛材細分割部６、８の細分割状況の判定
太さ４０００デニール、長さ８０ｃｍのフィラメント２０００本たばね、細分割加工機で分割刃６０００回転／１分間の回転スピードにて、当フィラメントの先端部を長手方向に細分割し毛材を得た。この毛材の細分割状況を次の基準で判断した。
○；毛材から細分割された繊維の断面形状並びに太さがほぼ均一、当繊維の分割された方向と、分割長が一定である。
△；毛材から細分割された繊維の断面形状並びに太さが不均一だが、当繊維の分割された方向と、分割長が一定である。
×；毛材から細分割された繊維内、１〜２本顕著に太いものがあり、かつ、他の繊維は、ちぢれた状態にある。当繊維の分割された方向と、分割長は全く不揃いである。
(2)毛材の熱に対する寸法安定性
上記(1)で得られた毛材を細分割部の端から５０ｃｍとり、７０℃の乾燥機の中で２４時間放置後取り出し、毛材の寸法安定性を次の基準で判断した。
○；収縮率が１％以下、毛材全体並びに毛材の先割部の形状変化が全くない。
△；収縮率が１〜３％、毛材全体に若干のカールが発生、毛材の先割部構成繊維に縮みが発生する。
×；収縮率が３％以上、毛材全体に大幅なカールが発生、毛材の先割部構成繊維に激しい縮みが発生する、もしくは丸まった状態となる。
(3)被洗浄物への損傷度
直径１０ｃｍ、長さ２０ｃｍのミニロール上に、上記(1)で得られた毛材を細分割部の端から長さ１０ｃｍとり、それを２００本毛材の細分割部をミニロールのロール表面に対して外に向くように均一に植毛し、ミニロールブラシを作成した。そして、このミニロールブラシをポリメチルメタアクリアート板に１ｋｇ荷重で押し付け、６００回転／１分間にて５時間擦り、ポリメチルメタアクリアート板面の損傷度を調べた。そして次の基準で判断した。
ランクＡ：全く傷が発生しないもの。
ランクＢ：傷跡が認められるものの、浅く少ない。
ランクＣ：傷跡がはっきり認められるもの。
(4)毛材形状の安定性
上記(3)の測定後のミニロールブラシから、毛材１００本を取り出し、この測定をする前の毛材と比較した。比較は次の２点でおこなった。
イ）細分割の進行状況；細分割毛の長さＫａ，Ｋｂの測定。
ロ）細分割毛の状況；細分割毛６ａ、９ａの脱落、変形の観測。
この比較結果から、次の判断基準をもって毛材形状の安定性を判断した。
○；細分割がほとんど進行しない。即ち、細分割毛の長さＫａ，Ｋｂが上記(3)測定前後に於いてほとんどかわらず、細分割毛６ａの脱落がほとんど見られない。
△；細分割が進行する。即ち、細分割毛の長さＫａ，Ｋｂが上記(3)測定前の３倍程度の進行であり、又、細分割毛６ａの脱落が若干あった。
×；細分割が大幅に進行、即ち、細分割毛の長さＫａ，Ｋｂが大きくなり、又、細分割毛６ａの脱落が顕著であった。
【００１６】
実施例１
密度０．９１０、メルトインデックス２．０の低密度ポリエチレン樹脂をＬ／Ｄ＝２．４、圧縮比３．０、スクリュー径５０ｍｍのモノフィラメント用紡糸機に、本発明の板状にて巾方向２ｍｍに４個のうねりからなる横断面のモノフィラメントを成型する孔を１０ケ設けた紡口から樹脂温度２００℃で押し出し、水冷後、９０℃の入った延伸槽に導き、４．６倍に延伸後、９０℃の熱湯中でセットし、出来たモノフィラメントを巻き取った。モノフィラメントの太さは４０００デニールであった。このフィラメントを洗車用ブラシとして毛材の長手方向に細分割加工し、これを実施例１とした。この実施例１についての、細分割毛６ａ、太い繊維９、細い繊維９ａの細分割状況の判定、毛材の熱に対する寸法安定性、被洗浄物への損傷度、毛材形状の安定性、について調べた。その結果を表１に示す。
【００１７】
実施例２
密度０．９２０、メルトフローレート２．１の直鎖状低密度ポリエチレン樹脂をＬ／Ｄ＝２．４、圧縮比３．０、スクリュー径５０ｍｍのモノフィラメント用紡糸機に、本発明の板状にて巾方向２ｍｍに６個のうねりからなる横断面のモノフィラメントを成型する孔を１０ケ設けた紡口から樹脂温度２００℃で押し出し、水冷後、９０℃の入った延伸槽に導き、４．２倍に延伸後、９０℃の熱湯中でセットし、出来たモノフィラメントを巻き取った。モノフィラメントの太さは４０００デニールであった。このモノフィラメントを洗車用ブラシとして毛材の長手方向に細分割加工し、これを実施例２とした。実施例１と同一内容について調べ、その結果を表１に示す。
【００１８】
実施例３
密度０．９１０、メルトインデックス２．０の低密度ポリエチレン樹脂７０重量部と密度０．８８０、メルトフローレート１．４のエチレン−αオレフィン共重合体エラストマー３０重量部をタンブラー式ブレンダーでブレンドした。Ｌ／Ｄ＝２．４、圧縮比３．０、スクリュー径５０ｍｍのモノフィラメント用紡糸機に、本発明の板状にて巾方向２ｍｍに４個のうねりからなる横断面のモノフィラメントを成型する孔を１０ケ設けた紡口から樹脂温度２００℃で押し出し、水冷後、９０℃の入った延伸槽に導き、４．６倍に延伸後、９０℃の熱湯中でセットし、出来たモノフィラメントを巻き取った。モノフィラメントの太さは４０００デニールであった。このフィラメントを洗車用ブラシとして毛材の長手方向に細分割加工し、これを実施例３とした。実施例１と同一内容について調べ、その結果を表１に示す。
実施例４
密度０．９２０、メルトフローレート２．１の直鎖状低密度ポリエチレン樹脂９０重量部と、密度０．９１０、メルトフローレート５．６のスチレン−エチレン−ブロック共重合体エラストマー１０重量部をタンブラー式ブレンダーでブレンドした。Ｌ／Ｄ＝２．４、圧縮比３．０、スクリュー径５０ｍｍのモノフィラメント用紡糸機に、実施例２と同一孔を１０ケ設けた紡口から樹脂温度２００℃で押し出し、水冷後、９０℃の入った延伸槽に導き、４．６倍に延伸後、９０℃の熱湯中でセットし、出来たモノフィラメントを巻き取った。モノフィラメントの太さは４０００デニールであった。このフィラメントを洗車用ブラシとして毛材の長手方向に細分割加工し、実施例１と同一内容について調べ、その結果を表１に示す。
【００１９】
尚、比較例として次の毛材を用い、実施例１と同様の判定をおこなった。又比較例における細分割加工条件は、実施例と同一とした。
比較例１；十字形状した孔を紡口に取り付けた紡糸機にて、他は実施例１と同じ条件で得た十字型横断面を有す毛材。
比較例２；図３に示す横断面の糸を成型する孔紡口に取り付けた紡糸機にて、他は実施例１と同じ条件で得た図３の横断面を有す毛材。
比較例３；低密度ポリエチレン樹脂３０重量部とエチレン−αオレフィン共重合体熱可塑性エラストマー７０重量部とを配合したものを用いて、他は実施例３と同じ条件で得た毛材。
比較例４；直鎖状低密度ポリエチレン樹脂９９．８重量部とスチレン−エチレン−ブロック共重合体エラストマー０．２重量部とを配合したものを用いて、他は実施例４と同じ条件で得た毛材。
【００２０】
【表１】

【００２１】
表１に示す結果から、図１（Ａ）の横断面を有する毛材は被洗浄物への損傷が極めて少ない特性があることが判明した。また、本発明の熱可塑性エラストマー組成で、かつ、本発明の横断面を有す毛材は、均一なる細分割加工が出来、従来の毛材（比較例１）と同等の熱に対する寸法安定性があり、細分割毛６ａの破損が見られず、かつ、細分割毛の長さＫａの進行の極めて少ない、弾力性並びに柔軟性のあるすぐれた毛材であった。更に、色彩鮮明性に於いてもすぐれていた。また、本発明の毛材を洗車ブラシに組み立て、自動車洗車機に組み入れ、高速化で洗車をおこなったところ、すぐれた洗浄力がある事が判明した。
【００２２】
【発明の効果】
以上説明した様に、本発明のブラシ用毛材は、エチレン−αオレフィン共重合体熱可塑性エラストマー又はスチレン・エチレンブロック共重合体熱可塑性エラストマーのいずれか一方０．５〜４０重量部と、低密度ポリエチレン又は直鎖状低密度ポリエチレンのいずれか一方あるいは低密度ポリエチレンと直鎖状低密度ポリエチレンを混合したもの６０〜９９．５重量部とを配合した樹脂組成物からなる長尺板状の毛材であって、太さ３０００〜８０００デニールで巾方向にうねり１を有し、長手方向の先端部に細分割加工を施して細分割毛６ａを形成したので、その細分割毛が、均一な形状並びに太さになっており、また、破損しづらく、細分割部の長さが拡大しないという特性を備えている。従って、被洗浄面に均一にかつ柔軟に接触することが出来、被洗浄面を傷付けることなく、持続性のある極めて良好な洗浄性能を発揮する。なお、この特性は洗車用ブラシのほか、ボデーブラシや衣類用ブラシ等にも要求されており、これらの毛材としても十分使用出来る。
【図面の簡単な説明】
【図１】（Ａ）は、本発明の実施例のブラシ用毛材を示す横断面図、（Ｂ）は、同ブラシ用毛材の先端部を示す斜視図である。
【図２】（Ａ）は、従来の十字型異形断面モノフィラメントのブラシ用毛材を示す横断面図、（Ｂ）は同ブラシ用毛材の先端部を示す斜視図である。
【図３】従来の樋状の保水溝を各数列もつモノフィラメントの横断面図である。
【符号の説明】
１うねり
２うねりが始まる端面
３うねりが終わる端面
４うねりの谷間
５毛材
６細分割部分
６ａ細分割毛
７主幹
７ａ主幹の先端部
８細分割部分
９太い繊維
９ａちぢれた状態の細い繊維
１０保水溝
ｈうねりの高さ
Ｋａ細分割毛の長さ
Ｋｂ細分割毛の長さ [0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bristle material for a brush suitable for cleaning automobile bodies, instrument articles, and the like.
[0002]
[Prior art]
Conventionally, the bristle material for brushes has been used in many different cross-section monofilaments having various shapes. In particular, in the case of automobile body cleaning, in order to reduce scratches on the body surface, the tip of the irregular cross-section monofilament has been subdivided in the longitudinal direction and used as a hair material. However, with the recent increase in the speed of car washing, there is a demand for reducing the scratches on the surface of the automobile body as much as possible and increasing the washing power. In order to respond to this request, the shape of the finely divided portion of the hair material that exhibits the cleaning effect without first contacting the automobile body and damaging the body surface is an important factor.
[0003]
Conventionally, the irregular cross-section monofilaments used for hair materials are what are called multi-lobals such as triangles, pentagons, etc., or Y-shaped, cross-shaped, saddle-shaped, and further, JP-A-1-239107 and real fairness It has a main trunk, and has a plurality of protruding sides extending radially from the main trunk, which is proposed in 5-42742.
When this is subdivided in the longitudinal direction under certain conditions, for example, in the case of the cross section shown in FIG. 2A, the state shown in FIG. 2B is obtained. That is, it becomes a thin fiber 9a in a state of being twisted with a thick fiber 9 centering on the main trunk 7 . The cross-section and direction of the chopped fibers 9a are completely uneven. When the automobile is washed at high speed using the hair material in this state, the thick fibers 9 centering on the main trunk 7 strongly hit the body surface of the automobile, and the fine fibers 9a in the twisted state hardly hit. As a result, uniform cleaning cannot be performed. Moreover, the thick fiber 9 centering on the main trunk is poor in flexibility and damages the automobile body.
[0004]
Further, in JP-A-1-278572, as shown in FIG. 3, for forming a surface in the longitudinal direction along gutter-shaped water retention groove of a strip-shaped brush material into multiple rows and subdividing tip longitudinally brush Hair material has been proposed, but in this case as well, since the cross section has a non-uniform thickness in the width direction, the subdivided state is a mixed state of thick fibers and thin fibers as in the cross shape It becomes. Accordingly, the cleaning performance cannot be expected to be as good as the cross shape.
[0005]
In JP-A-1-977731, JP-A-3-11835 and JP-A-6-22815, a thermoplastic elastomer is used as a bristle material for a brush, and in JP-A-6-128814, a polyester elastomer is used as an industrial material. A report has been made. Thermoplastic elastomers are sticky and have poor dimensional stability against heat compared to thermoplastic resins. In particular, the monofilament having adhesiveness is poor in subdividing workability and cannot be used as a brush hair material. These are 100% thermoplastic elastomer, or monofilaments molded with a thermoplastic elastomer as a sheath component and a thermoplastic resin into a core-sheath structure that is a core component, but exhibit strong adhesiveness and poor dimensional stability against heat. Therefore, any brush hair material for car wash is not suitable. In view of the above, the bristle material obtained by subdividing the atypical cross-section monofilament used in the longitudinal direction is insufficient, and an appropriate brush bristle material is not made using a thermoplastic elastomer.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a brush hair material that is extremely cleanable and excellent in shape stability without damaging the surface to be cleaned in the cleaning of automobile bodies and appliances. .
[0007]
[Means for Solving the Problems]
The brush bristle material of the present invention employs the following means in order to achieve the above object. That is, either 0.5 to 40 parts by weight of either an ethylene-α olefin copolymer thermoplastic elastomer or a styrene / ethylene block copolymer thermoplastic elastomer, and either a low density polyethylene or a linear low density polyethylene Or it is a long-plate-like hair material which consists of a resin composition which mix | blended 60-99.5 weight part what mixed the low density polyethylene and the linear low density polyethylene, Comprising: Thickness 3000-8000 denier and width It has undulations 1 in the direction, and is characterized in that a finely divided hair 6a is formed by subjecting the tip in the longitudinal direction to fine division.
[0008]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1A is a cross-sectional view of a brush bristle material. When the undulation 1 is stretched, it becomes a quadrilateral, and the end surface 2 where the undulation starts and the end surface 3 where the undulation ends are preferably within the height h of the undulation. Further, it is desirable that the undulation pitch L is continuous at least 1.5 or more. The undulations 1 are wavy and the undulation valleys 4 are water retention grooves. The flow of washing water is easy to get over in the width direction because the undulation itself is connected in a wave shape. Accordingly, a uniform cleaning liquid layer is formed at the contact interface between the automobile body and the hair material, and an excellent cleaning effect can be expected.
[0009]
FIG. 1 (B) shows the tip of the brush bristle material 1. The subdivision 6 of the bristle material is composed of fibers having substantially the same cross section and thickness. The length Ka of the subdivided hair is also constant, and the direction of the subdivided hair 6a is also aligned. The reason why the finely divided hairs 6a are uniformly arranged in this way is that the thickness of the cross section forming the undulation in the single hair material of the present invention is substantially constant. This is because, as a result, the dividing pressure of the finely divided blade is applied uniformly in the width direction of the transverse section.
[0010]
The resin composition of the bristle material 5 using the thermoplastic elastomer of the present invention is either 0.5 to 40 parts by weight of either ethylene-α olefin copolymer thermoplastic elastomer or styrene / ethylene block copolymer thermoplastic elastomer. One of low-density polyethylene and linear low-density polyethylene, or 60 to 99.5 parts by weight of a mixture of low-density polyethylene and linear low-density polyethylene is blended.
[0011]
Furthermore, 0.2 to 5 parts by weight of a lubricant and 0.2 to 0.8 parts by weight of an ultraviolet absorber may be added to 100 parts by weight of this blend. Further, a colorant such as an inorganic pigment may be added.
[0012]
A filament having a cross section as shown in FIG. 1 (A) was molded from this blend by a melt extrusion molding method, and subdivided in the longitudinal direction. In the subdivision state, as shown in FIG. 1B, the subdivision section 6 is composed of

subdivision hairs

6a having substantially the same cross-sectional shape and thickness, and the length Ka of the subdivision hairs is also constant. A dense structure was obtained. Moreover, as a result of assembling this bristle into a car wash brush, incorporating it into an automobile car wash machine, and washing the car at high speed, the length Ka of the finely divided hair does not increase, and the finely divided hair of the finely divided portion 6 does not increase. There was an extremely excellent function that should be noted, with almost no breakage of 6a. Further, this bristle material was excellent in dimensional stability against heat, flexible, elastic, colored, and sharp. This is because the ethylene-α olefin copolymer thermoplastic elastomer or the styrene-ethylene block copolymer thermoplastic elastomer is very uniformly micro-dispersed in a low density polyethylene or a linear low density polyethylene, and is stable. It seems that the conditions are suitable for taking the structure. In addition, in the monofilament in which 40 parts by weight or more of the ethylene-α olefin copolymer thermoplastic elastomer is blended with low density polyethylene, the tackiness is gradually developed. Processing cannot be performed. In addition, a stable monofilament cannot be formed by extrusion molding. On the other hand, if it is 0.5 parts by weight or less, it does not contribute to the improvement in the stability of the finely divided portion 6 of the hair material after washing at a high speed as described above.
[0013]
Delete [0014]
In addition, the thickness of the hair material is 3,000 to 8,000 denier.
[0015]
Next, the contents tested are described.
The determination of the subdivision status of the hair material subdivision parts 6 and 8, the dimensional stability against the heat of the hair material, the degree of damage to the object to be cleaned, and the stability of the hair material shape were determined by the following experimental methods.
(1) Judgment of subdivision status of hair material subdivision sections 6 and 8 Thickness of 4000 denier, spring of 2000 filaments of 2000 filaments, subdivision processing machine at a rotation speed of 6000 rotations per minute. The tip of the filament was subdivided in the longitudinal direction to obtain a hair material. The subdivision status of this hair material was judged according to the following criteria.
○: The cross-sectional shape and thickness of the fiber subdivided from the hair material are substantially uniform, the direction in which the fiber is divided, and the division length are constant.
Δ: The cross-sectional shape and thickness of the fiber subdivided from the hair material are not uniform, but the direction in which the fiber is divided and the division length are constant.
X: Among the fibers subdivided from the hair material, there are one or two remarkably thick ones, and the other fibers are in a tumbled state. The direction in which the fibers are divided and the division length are completely uneven.
(2) Dimensional stability of the hair material against heat The hair material obtained in (1) above is taken 50 cm from the end of the subdivision section, left in a dryer at 70 ° C. for 24 hours, and then taken out to stabilize the hair material. Sex was judged according to the following criteria.
○: Shrinkage rate is 1% or less, and there is no change in the shape of the whole hair material and the front split part of the hair material.
Δ: Shrinkage rate is 1 to 3%, slight curl is generated in the whole hair material, and shrinkage is generated in the fiber constituting the front split portion of the hair material.
X: Shrinkage rate of 3% or more, significant curling occurs in the entire hair material, severe shrinkage occurs in the fiber constituting the front split portion of the hair material, or the hair becomes curled.
(3) Degree of damage to the object to be cleaned On the mini roll having a diameter of 10 cm and a length of 20 cm, the hair material obtained in the above (1) is taken from the end of the subdivided portion to a length of 10 cm, and 200 hair materials are obtained. The hair was evenly planted so that the subdivided portions of the material face outward with respect to the roll surface of the mini-roll, and a mini-roll brush was created. Then, this mini-roll brush was pressed against the polymethyl metaacrylate plate with a load of 1 kg and rubbed at 600 rpm for 1 hour for 5 hours to examine the degree of damage of the polymethyl metaacrylate plate surface. Judgment was made based on the following criteria.
Rank A: No scratches are generated.
Rank B: Although scars are recognized, they are shallow and few.
Rank C: A scar is clearly recognized.
(4) Stability of hair material shape 100 hair materials were taken out from the mini-roll brush after the measurement of (3) above and compared with the hair material before this measurement. The comparison was made at the following two points.
B) the progress of subdivision; subdivision bristle length Ka, measurement of Kb.
B) Condition of subdivided hairs : Observation of dropout and deformation of the subdivided hairs 6a and 9a.
From this comparison result, the stability of the hair material shape was determined according to the following criteria.
○: Subdivision hardly progresses. In other words, the lengths Ka and Kb of the subdivided hairs are almost the same before and after the measurement (3), but the subdivided hairs 6a are hardly dropped.
Δ: Subdivision proceeds. That is, the lengths Ka and Kb of the finely divided hairs progressed about three times before the above (3) measurement, and the finely divided hairs 6a were slightly dropped.
X: The subdivision progressed greatly, that is, the lengths Ka and Kb of the subdivided hairs increased, and the subsidence of the subdivided hairs 6a was remarkable.
[0016]
Example 1
A low density polyethylene resin having a density of 0.910 and a melt index of 2.0 is L / D = 2.4, a compression ratio of 3.0, a screw diameter of 50 mm, and a monofilament spinning machine of the present invention in the width direction of 2 mm. Extruded at a resin temperature of 200 ° C from a nozzle provided with 10 holes for molding a monofilament with a cross section consisting of 4 undulations, cooled to water, led to a stretching tank containing 90 ° C, and stretched 4.6 times And set in hot water at 90 ° C., and the resulting monofilament was wound up. The thickness of the monofilament was 4000 denier. This filament was subdivided in the longitudinal direction of the hair material as a car wash brush, and this was designated as Example 1. For Example 1, subdivided hair 6a, thick fiber 9, determination of subdivision status of thin fiber 9a , dimensional stability against heat of hair material, degree of damage to object to be cleaned, stability of hair material shape, Investigated about. The results are shown in Table 1 .
[0017]
Example 2
A linear low density polyethylene resin having a density of 0.920 and a melt flow rate of 2.1 is applied to a monofilament spinning machine of L / D = 2.4, compression ratio of 3.0, screw diameter of 50 mm, and the plate of the present invention. Then, extrusion was performed at a resin temperature of 200 ° C. from a nozzle provided with 10 holes for molding a monofilament having a cross section of 6 undulations in a width direction of 2 mm, and after cooling with water, it was led to a drawing bath containing 90 ° C. 4.2. After stretching twice, it was set in hot water at 90 ° C., and the resulting monofilament was wound up. The thickness of the monofilament was 4000 denier. This monofilament was subdivided in the longitudinal direction of the hair material as a car wash brush, and this was designated as Example 2. The same contents as in Example 1 were examined, and the results are shown in Table 1.
[0018]
Example 3
70 parts by weight of a low density polyethylene resin having a density of 0.910 and a melt index of 2.0 and 30 parts by weight of an ethylene-α-olefin copolymer elastomer having a density of 0.880 and a melt flow rate of 1.4 were blended in a tumbler blender. L / D = 2.4, compression ratio 3.0, screw diameter 50 mm monofilament spinning machine has holes for molding monofilaments with a cross section of 4 wavinesses in the width direction 2 mm in the plate shape of the present invention. Extruded from 10 nozzles at a resin temperature of 200 ° C, cooled with water, led to a drawing tank containing 90 ° C, drawn 4.6 times, set in hot water at 90 ° C, and wound up the resulting monofilament It was. The thickness of the monofilament was 4000 denier. This filament was subdivided in the longitudinal direction of the hair material as a car wash brush, and this was designated as Example 3. The same contents as in Example 1 were examined, and the results are shown in Table 1.
Example 4
90 parts by weight of a linear low-density polyethylene resin having a density of 0.920 and a melt flow rate of 2.1 and 10 parts by weight of a styrene-ethylene block copolymer elastomer having a density of 0.910 and a melt flow rate of 5.6 Blended with a formula blender. A monofilament spinning machine of L / D = 2.4, compression ratio 3.0, screw diameter 50 mm was extruded at a resin temperature of 200 ° C. from a spinner having 10 holes identical to those in Example 2, and after cooling with water, 90 ° C. After drawing to 4.6 times, it was set in hot water at 90 ° C., and the resulting monofilament was wound up. The thickness of the monofilament was 4000 denier. This filament was subdivided in the longitudinal direction of the bristle material as a car wash brush, the same contents as in Example 1 were examined, and the results are shown in Table 1.
[0019]
In addition, the same determination as Example 1 was performed using the following hair material as a comparative example. Further, the subdivision processing conditions in the comparative example were the same as those in the example.
Comparative Example 1 A bristle material having a cross-shaped cross section obtained under the same conditions as in Example 1 except that the spinning machine had cross-shaped holes attached to the spinneret.
Comparative Example 2: A hair material having the cross section of FIG. 3 obtained under the same conditions as in Example 1 except that the spinning machine was attached to a hole spout for forming the cross section yarn shown in FIG.
Comparative Example 3 A hair material obtained under the same conditions as in Example 3 except that 30 parts by weight of a low density polyethylene resin and 70 parts by weight of an ethylene-α olefin copolymer thermoplastic elastomer were blended.
Comparative Example 4; obtained by blending 99.8 parts by weight of a linear low density polyethylene resin and 0.2 parts by weight of a styrene-ethylene-block copolymer elastomer, and the others were obtained under the same conditions as in Example 4. Hair material.
[0020]
[Table 1]

[0021]
From the results shown in Table 1, it was found that the hair material having the cross section of FIG. 1A has a characteristic that damage to an object to be cleaned is extremely small. Further, the hair material having the thermoplastic elastomer composition of the present invention and having the cross section of the present invention can be uniformly subdivided, and has the same dimensional stability against heat as the conventional hair material (Comparative Example 1). Thus, the finely divided hair 6a was not damaged, and the length Ka of the finely divided hair was extremely small. Furthermore, it was excellent in color clarity. Further, when the hair material of the present invention was assembled into a car wash brush, incorporated in an automobile car wash machine, and washed at a high speed, it was found that it had excellent detergency.
[0022]
【The invention's effect】
As described above, the bristle material for brushes of the present invention has an ethylene-α-olefin copolymer thermoplastic elastomer or a styrene / ethylene block copolymer thermoplastic elastomer of 0.5 to 40 parts by weight, low in weight. Long plate-like hair comprising a resin composition in which either one of density polyethylene or linear low-density polyethylene, or 60 to 99.5 parts by weight of a mixture of low-density polyethylene and linear low-density polyethylene is blended Since the material is a material having a thickness of 3000 to 8000 denier and waviness 1 in the width direction, and the finely divided hair 6a is formed by subjecting the distal end portion in the longitudinal direction to the finely divided hair, the finely divided hair is uniform. It has a shape and thickness, is not easily damaged, and has a characteristic that the length of the subdivided portion does not increase. Accordingly, the surface to be cleaned can be contacted uniformly and flexibly, and a very good and durable cleaning performance can be exhibited without damaging the surface to be cleaned. Note that this property Other car washing brush, to body brushes and clothes brushes, etc. are required, it is also sufficiently used as these bristles.
[Brief description of the drawings]
FIG. 1A is a cross-sectional view showing a bristle material for a brush according to an embodiment of the present invention, and FIG. 1B is a perspective view showing a tip portion of the bristle material for the brush.
2A is a cross-sectional view showing a conventional bristle material for a cross-shaped irregular cross-section monofilament, and FIG. 2B is a perspective view showing a tip of the brush hair material.
FIG. 3 is a cross-sectional view of a monofilament having several rows of conventional bowl-shaped water retention grooves.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Swell 2 End face 3 where the swell starts End face 4 where the swell ends 4 Wavy valley 5 Hair material 6 Subdivided portion 6a

Subdivided hair

7 Main trunk 7a Main trunk tip 8 Subdivided portion
9 Thick fibers 9a Thin fibers 10 in a squeezed state 10 Water retention groove h Swell height
Ka Length of finely divided hair
Kb Length of subdivided hair

Claims

0.5 to 40 parts by weight of either ethylene-α olefin copolymer thermoplastic elastomer or styrene / ethylene block copolymer thermoplastic elastomer, and either low density polyethylene or linear low density polyethylene or low A long plate-like hair material composed of a resin composition in which 60 to 99.5 parts by weight of a mixture of density polyethylene and linear low density polyethylene is blended, and having a thickness of 3000 to 8000 denier in the width direction A bristle material for a brush having undulations 1 and having finely divided hairs 6a formed by subjecting the front end portion in the longitudinal direction to fine division .