JP2013194142A - Molded form comprising polypropylene resin composition - Google Patents
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本発明は、溶融成形時の際に良好な成形性を有するポリプロピレン樹脂組成物からなる成形体に関するものであり、工業的使用のために任意の形状に切削加工を行う際、ポリエスエル樹脂成形体と同等の寸法安定性を有し、切削加工時の割れや欠けが少なく、良好な曲げ弾性率を示す成形体に関するものである。 The present invention relates to a molded article made of a polypropylene resin composition having good moldability at the time of melt molding. When cutting into an arbitrary shape for industrial use, a polyester resin molded article and The present invention relates to a molded article that has equivalent dimensional stability, has few cracks and chips during cutting, and exhibits a good flexural modulus.
工業製品の製造において、樹脂加工業界では、例えば、板状、丸棒形状の樹脂製品を切削加工し、任意の形状の部品を加工することが行われている。このような用途での樹脂成形体として、ポリカーボネート、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリアセタール、ポリエーテルエーテルケトン、ポリプロピレン、ポリ塩化ビニルなどの樹脂が通常使用される。これらの中でも、ポリエチレンテレフタレートなどの熱可塑性ポリエステル樹脂は、機械的性質に優れ、安価に供給されることから、切削加工材料として一般的である。また、高い強度や耐熱性、寸法安定性を求められる用途に対しては、熱可塑性ポリエステル樹脂をガラス繊維などの各種フィラーで繊維強化した繊維強化プラスチックも一般的に用いられている。 In the manufacture of industrial products, in the resin processing industry, for example, plate-shaped and round bar-shaped resin products are cut and parts having arbitrary shapes are processed. As the resin molded body for such applications, resins such as polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyacetal, polyether ether ketone, polypropylene, and polyvinyl chloride are usually used. Among these, thermoplastic polyester resins such as polyethylene terephthalate are common as cutting materials because they are excellent in mechanical properties and are supplied at low cost. For applications that require high strength, heat resistance, and dimensional stability, fiber reinforced plastics in which a thermoplastic polyester resin is reinforced with various fillers such as glass fibers are generally used.
しかしながら、熱可塑性ポリエステル樹脂は、機械的強度は高いものの、切削加工時の衝撃に対して弱く、加工時に割れや欠けといった不具合が発生し、加工性が悪いといった問題がある。さらに、当該樹脂からなる成形体は、等方性がないため、加工使用時に方向が固定されてしまうという問題がある。また、切削加工された部品が工場内で部材用途として用いられる場合、工場の火災リスクを低減するため、樹脂材料には高い難燃性が要求される。 However, although the thermoplastic polyester resin has high mechanical strength, it is weak against an impact at the time of cutting, and there is a problem that defects such as cracking and chipping occur at the time of processing, resulting in poor workability. Furthermore, since the molded body made of the resin is not isotropic, there is a problem that the direction is fixed during processing and use. Further, when a machined part is used as a member application in a factory, the resin material is required to have high flame resistance in order to reduce the fire risk of the factory.
それに対し、ポリプロピレンに代表される熱可塑性ポリオレフィン樹脂は、切削加工時の割れや欠けは発生しにくく、切削加工性は良好であるものの、機械的特性は低く、寸法安定性も劣ることから、精密な切削加工には用い難いという問題がある。また、ポリエステル樹脂成形体に比べると、寸法安定性に劣っている。 On the other hand, thermoplastic polyolefin resins represented by polypropylene are less susceptible to cracking and chipping during cutting and have good machinability but low mechanical properties and poor dimensional stability. There is a problem that it is difficult to use it for cutting. Moreover, it is inferior to dimensional stability compared with the polyester resin molding.
本発明は、上記実情に鑑みなされたものであり、その解決課題は、使用時（加工時）において寸法変化が少なく、ポリエステル樹脂成形品同等の寸法安定性を有し、難燃性、種々の機械的特性、電気絶縁性、寸法安定性、および切削加工による加工性が高度に優れ、各種用途において好適に利用することのできる、ポリプロピレン樹脂組成物からなる成形体を安価に提供することにある。 The present invention has been made in view of the above circumstances, and the problem to be solved is that there is little dimensional change during use (during processing), dimensional stability equivalent to that of a polyester resin molded product, flame retardancy, The object is to provide a molded article made of a polypropylene resin composition at low cost, which has excellent mechanical properties, electrical insulation, dimensional stability, and workability by cutting, and can be suitably used in various applications. .
本発明者らは、上記課題に鑑み鋭意検討した結果、特定の構成を有するポリプロピレン樹脂組成物およびそれからなる成形体によれば、上記課題を容易に解決できることを見いだし、本発明を完成するに至った。 As a result of intensive investigations in view of the above problems, the present inventors have found that the above problems can be easily solved by a polypropylene resin composition having a specific configuration and a molded body comprising the composition, and have completed the present invention. It was.
すなわち、本発明の要旨は、使用時（加工時）において寸法変化が少なく、ポリエステル樹脂成形品同等の寸法安定性を有し、難燃性、種々の機械的特性、電気絶縁性、寸法安定性、および切削加工による加工性が高度に優れ、各種用途において好適に利用することのできる、ポリプロピレン樹脂組成物からなる成形体に存する。 That is, the gist of the present invention is that there is little dimensional change during use (processing), dimensional stability equivalent to that of a polyester resin molded product, flame retardancy, various mechanical properties, electrical insulation, dimensional stability. And it exists in the molded object which consists of a polypropylene resin composition which is highly excellent in workability by cutting, and can be suitably used in various applications.
本発明によれば、等方性、機械的特性、寸法安定性、および切削性に優れたポリプロピレン樹脂組成物およびそれからなる成形体を安価に提供することができ、本発明の工業的価値は高い。 ADVANTAGE OF THE INVENTION According to this invention, the polypropylene resin composition excellent in isotropic property, mechanical characteristics, dimensional stability, and machinability, and the molded object consisting thereof can be provided at low cost, and the industrial value of this invention is high. .
本発明で言うポリプロピレン樹脂とは、ホモポリマー、ブロックコポリマーなどの各種ポリプロピレン樹脂が挙げられるが、好ましくはホモポリマータイプのポリプロピレン樹脂である。また、樹脂の溶融特性として知られるメルトフローインデックス（ＪＩＳ Ｋ ７２１０に準拠）については、シート状への溶融成形の際の成形性の観点から、通常４ｇ／１０分未満、好ましくは２．５ｇ／１０分未満、さらに好ましくは１．５ｇ／１０分である。ポリプロピレン樹脂のメルトフローインデックスが４ｇ／１０分を超えると、シート状への溶融成形の際に樹脂の流動性が高すぎて成形困難になるという不具合が発生することがある。 The polypropylene resin referred to in the present invention includes various polypropylene resins such as homopolymers and block copolymers, and is preferably a homopolymer type polypropylene resin. In addition, the melt flow index (conforming to JIS K 7210) known as the melting property of the resin is usually less than 4 g / 10 minutes, preferably 2.5 g / in, from the viewpoint of moldability during melt molding into a sheet. Less than 10 minutes, more preferably 1.5 g / 10 minutes. When the melt flow index of the polypropylene resin exceeds 4 g / 10 min, there may be a problem that the resin fluidity is too high at the time of melt-molding into a sheet shape, which makes it difficult to mold.
本発明で使用するガラス繊維としては、例えば、グラスパウダー、チョップドストランド、合糸ロービングなどの各種形状が挙げられるが、樹脂に添加するという観点、および繊維形状保持による機械的強度向上の観点から、チョップドストランド形状が好適である。また、樹脂との親和性向上のために各種の表面処理剤が添加されるが、本用途ではポリプロピレン樹脂へ添加するので、熱可塑性樹脂用（ＦＲＴＰ用）のガラス繊維を用いることが好ましい。ガラス繊維の長さは、通常２〜５ｍｍの範囲であり、３〜５ｍｍの範囲が高アスペクト比による機械的性能の向上の観点から好ましい。ガラス繊維の径は、通常１０〜３０μｍの範囲であり、１０〜２０μｍの範囲が樹脂性能の強化の観点から好ましい。ポリプロピレン樹脂板状成形物中のガラス繊維の含有量は、５〜２０重量％の範囲が好ましく、さらに好ましくは１０〜１５重量％の範囲である。ガラス繊維の含有量が多くなるほど荷重たわみ温度、アイゾット衝撃強度が向上する傾向があるため、１０重量％未満では、アイゾット衝撃強度が低く、衝撃に弱くなるという不具合があることがある。一方、ガラス繊維の含有量が２０重量％を超えると、樹脂の流動特性が悪化し、シートの溶融成形時に成形困難になるという場合がある。 Examples of the glass fiber used in the present invention include various shapes such as glass powder, chopped strands, and combined yarn roving, but from the viewpoint of adding to the resin, and from the viewpoint of improving the mechanical strength by maintaining the fiber shape, A chopped strand shape is preferred. In addition, various surface treatment agents are added to improve the affinity with the resin, but in this application, glass fibers for thermoplastic resin (for FRTP) are preferably used because they are added to polypropylene resin. The length of the glass fiber is usually in the range of 2 to 5 mm, and the range of 3 to 5 mm is preferable from the viewpoint of improving the mechanical performance due to the high aspect ratio. The diameter of the glass fiber is usually in the range of 10 to 30 μm, and the range of 10 to 20 μm is preferable from the viewpoint of enhancing the resin performance. The glass fiber content in the polypropylene resin plate-like molded product is preferably in the range of 5 to 20% by weight, more preferably in the range of 10 to 15% by weight. As the glass fiber content increases, the deflection temperature under load and the Izod impact strength tend to be improved. If it is less than 10% by weight, the Izod impact strength is low and the impact may be weakened. On the other hand, if the glass fiber content exceeds 20% by weight, the flow characteristics of the resin deteriorate, and it may be difficult to mold the sheet during melt molding.
本発明で使用する無機化合物としては、例えば、タルク、マイカに代表される燐片状フィラー、チタン酸カリウムに代表される針状フィラー、炭酸カルシウム、シリカに代表される球状フィラーが挙げられる。樹脂に添加して寸法安定性、反り、曲げ弾性率といった機械的特性を補強するという観点から、面形状を有する燐片状フィラーとして知られるマイカ、タルクが好適である。さらには、機械的性能の向上の観点から、より大きな平均粒径を持ち、高アスペクト比となるマイカの使用が好適である。平均粒径としては、通常１０〜６０μｍ、好ましくは２０〜５０μｍ、さらに好ましくは２０〜４０μｍの範囲である。無機化合物の平均粒径が１０μｍ以下では溶融成形体の寸法安定性が損なわれる不具合が有ることがある。無機化合物の平均粒径が４０μｍ以上では、マイカの特有の光沢が発現し、溶融成形体の外観低下に繋がるという不具合が発生することがある。無機化合物の含有量としては、通常１０〜４０重量％、好ましくは１５〜３５重量％、さらに好ましくは２０〜３０重量％の範囲である。無機化合物の含有量が多くなるほど曲げ弾性率が向上する傾向があるため、１０重量％以下では十分な曲げ弾性率が発現しないことがある。一方、無機化合物の含有量が４０重量％以上では、溶融成形時の規定量の添加と均一分散が難しく、成形困難になることがある。 Examples of the inorganic compound used in the present invention include flaky fillers typified by talc and mica, acicular fillers typified by potassium titanate, calcium carbonate, and spherical fillers typified by silica. Mica and talc known as flake-like fillers having a surface shape are preferable from the viewpoint of adding to the resin and reinforcing mechanical properties such as dimensional stability, warpage, and flexural modulus. Further, from the viewpoint of improving mechanical performance, it is preferable to use mica having a larger average particle diameter and a high aspect ratio. As an average particle diameter, it is 10-60 micrometers normally, Preferably it is 20-50 micrometers, More preferably, it is the range of 20-40 micrometers. When the average particle size of the inorganic compound is 10 μm or less, there may be a problem that the dimensional stability of the melt-formed product is impaired. When the average particle size of the inorganic compound is 40 μm or more, a peculiar luster of mica appears and a problem that the appearance of the melt-formed product is deteriorated may occur. As content of an inorganic compound, it is 10 to 40 weight% normally, Preferably it is 15 to 35 weight%, More preferably, it is the range of 20 to 30 weight%. As the content of the inorganic compound increases, the flexural modulus tends to improve, and if it is 10% by weight or less, sufficient flexural modulus may not be exhibited. On the other hand, when the content of the inorganic compound is 40% by weight or more, it is difficult to add and uniformly disperse the specified amount during melt molding, which may make molding difficult.
ポリオレフィン樹脂に添加して難燃性を発現させるための難燃剤としては、例えば、臭素系、リン系、膨張黒鉛系、水酸化マグネシウム系などが挙げられる。本発明で使用する難燃剤としては、高い難燃性が要求されることから、低添加部数でも高い難燃効果を発現する臭素系難燃剤を用いることが好ましい。臭素系難燃剤としては、ＰＢＤＥ系、ＴＢＢＡ誘導体、多ベンゼン環化合物、臭素化ポリスチレン、フタル酸系などが挙げられる。本発明においては、難燃剤の融点、各種法規制との関係から、多ベンゼン環化合物を用いることが好ましい。難燃剤の含有量は、通常１０〜４０重量％、好ましくは１５〜３５重量％、さらに好ましくは２０〜３０重量％の範囲である。難燃剤の含有量が１５重量％以下では、十分な難燃性が発現しないことがある。さらに、臭素系難燃剤は難燃性を発現するために、アンチモン元素を通常含有しており、その臭素系難燃剤中に占める三酸化アンチモンの含有量は、通常１０〜４０重量％、好ましくは１５〜３５重量％である。含有率を変更しても余り難燃性に変化がないことが知られているので、本発明においては当該範囲で含有していてもよい。その結果、ＵＬ燃焼試験において、試片厚みが薄肉の１ｍｍという過酷な条件下でもＶ−０レベルを達成することが可能な難燃性樹脂組成物を提供することができる。 Examples of the flame retardant for adding flame retardant to the polyolefin resin include bromine, phosphorus, expanded graphite, and magnesium hydroxide. As the flame retardant used in the present invention, since a high flame retardancy is required, it is preferable to use a brominated flame retardant that exhibits a high flame retardant effect even with a low addition part. Examples of brominated flame retardants include PBDE, TBBA derivatives, polybenzene ring compounds, brominated polystyrene, and phthalic acid. In the present invention, it is preferable to use a polybenzene ring compound in view of the melting point of the flame retardant and various laws and regulations. The content of the flame retardant is usually in the range of 10 to 40% by weight, preferably 15 to 35% by weight, and more preferably 20 to 30% by weight. If the content of the flame retardant is 15% by weight or less, sufficient flame retardancy may not be exhibited. Furthermore, bromine-based flame retardants usually contain an antimony element in order to exhibit flame retardancy, and the content of antimony trioxide in the bromine-based flame retardant is usually 10 to 40% by weight, preferably 15 to 35% by weight. Since it is known that there is not much change in flame retardancy even when the content is changed, in the present invention, it may be contained in the range. As a result, it is possible to provide a flame retardant resin composition capable of achieving the V-0 level even under the severe condition of a thin specimen thickness of 1 mm in the UL combustion test.
また、本発明の要旨を超えない限り、本発明のポリプロピレン樹脂組成物中には、着色剤、酸化防止剤を含有してもよい。 Moreover, unless it exceeds the gist of the present invention, the polypropylene resin composition of the present invention may contain a colorant and an antioxidant.
着色剤としては、ポリオレフィン系樹脂製造の際に一般的に使用されている着色剤であれば特に限定されず、例えば、アゾ系、フタロシアニン系、スレン系、染料レーキ系等の有機顔料、酸化物系、クロム酸モリブデン系、硫黄物・セレン化物系、フェロシアン化物系等の無機顔料等が挙げられる。これらは単独で用いてもよく、２種以上を併用してもよい。 The colorant is not particularly limited as long as it is a colorant generally used in the production of polyolefin resins. For example, organic pigments and oxides such as azo, phthalocyanine, selenium, and dye lake Inorganic pigments such as those based on molybdenum, molybdenum chromate, sulfur / selenide, and ferrocyanide. These may be used alone or in combination of two or more.
酸化防止剤としては、ポリオレフィン系樹脂製造の際に一般的に使用されている酸化防止剤であれば特に限定されず、例えば、フェノール系抗酸化剤、硫黄系抗酸化剤、ホスファイト系抗酸化剤等が挙げられる。これらは単独で用いてもよく、２種以上を併用してもよい。 The antioxidant is not particularly limited as long as it is an antioxidant generally used in the production of polyolefin-based resins. For example, a phenol-based antioxidant, a sulfur-based antioxidant, a phosphite-based antioxidant. Agents and the like. These may be used alone or in combination of two or more.
本発明のポリプロピレン樹脂組成物からなる成形体は、溶融成形することによって、板状や丸棒状などの種々の形態の成形体に加工することができる。成形体としては、板状成形体が特に好ましい。 The molded body made of the polypropylene resin composition of the present invention can be processed into various types of molded bodies such as plates and round bars by melt molding. As the molded body, a plate-shaped molded body is particularly preferable.
溶融成形は、通常知られている方法を採用することができ、板状成形体の場合、押出成形やプレス成形、棒状成形体の場合、押出成形により成形加工することができる。 For melt molding, a generally known method can be employed. In the case of a plate-shaped molded body, extrusion molding or press molding, and in the case of a rod-shaped molded body, it can be molded by extrusion molding.
本発明の成形体のＭＤ方向（縦方向）の線膨張係数は３．５以下である必要がある。かかる線膨張係数を３．５以下とすることにより、高度な寸法安定性を付与することができる。 The linear expansion coefficient in the MD direction (longitudinal direction) of the molded body of the present invention needs to be 3.5 or less. By setting the linear expansion coefficient to 3.5 or less, high dimensional stability can be imparted.
板状成形体の曲げ弾性率は、通常５０００ＭＰａ以上であり、好ましくは５５００ＭＰａ以上であり、さらに好ましくは、６０００ＭＰａ以上である。曲げ弾性率が５０００ＭＰａ未満では、部材として使用する際の樹脂材の剛性が不足し、実用に供することができないことがある。 The bending elastic modulus of the plate-shaped molded body is usually 5000 MPa or more, preferably 5500 MPa or more, and more preferably 6000 MPa or more. When the bending elastic modulus is less than 5000 MPa, the rigidity of the resin material when used as a member is insufficient, and may not be practically used.
以下、本発明を実施例および比較例によってさらに詳細に説明する。なお、本発明における物性の測定方法、評価方法は以下のとおりである。 Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples. In addition, the measuring method and evaluation method of the physical property in this invention are as follows.
（１）線膨張係数
４ｍｍ厚の板状に成形した成形体をＪＩＳ Ｋ ７１９７に準拠して測定を行った。なお、測定範囲は２０〜４０℃で、昇温条件は２℃／ｍｉｎとする。また、本試験においてはサンプル成形時の延伸方向をＭＤ方向（Ｍａｃｈｉｎｅ Ｄｉｒｅｃｔｉｏｎ）、ＭＤ方向と直交する方向をＴＤ方向（Ｔｒａｎｓｖｅｒｓｅ Ｄｉｒｅｃｔｉｏｎ）と規定し、サンプルの各方向に対して測定を実施した。
(1) Linear expansion coefficient The molded object shape | molded in the plate shape of 4 mm thickness was measured based on JISK7197. The measurement range is 20 to 40 ° C., and the temperature raising condition is 2 ° C./min. Further, in this test, the stretching direction at the time of sample forming was defined as the MD direction (Machine Direction), and the direction orthogonal to the MD direction was defined as the TD direction (Transverse Direction), and the measurement was performed in each direction of the sample.
（２）切削性
本発明において、切削性は加工達成率という指標で評価する。切削加工での加工品の概略図は図１に示すとおりであり、（Ａ）は平面図、（Ｂ）は断面図である。矢印の方向に刃を動かして切削する。具体的には、板状成形体を切断し、８０ｍｍ×８０ｍｍ×１０ｍｍの試験片とした。当該試験片を、ＦＮＳ（株）製マシニングセンターＢＭ５３２Ｋを用いて、以下の条件で、８０ｍｍ長さに切削（「１行」とする）毎に０．６ｍｍずつ横、即ち行と直角方向、にずらして、切刃を交換せずに９行切削加工を行った。切削加工した行間に残る０．６ｍｍ厚の突起部分（以下、リブとする）に割れや欠けが発生せずに加工達成できるかを評価し、加工達成できたリブ数をカウントして総リブ数の８で割り、加工達成率を算出した。
使用工具切刃：φ６超硬エンドミル
(2) Machinability In the present invention, the machinability is evaluated by an index called processing achievement rate. A schematic diagram of a processed product in the cutting process is as shown in FIG. 1, (A) is a plan view, and (B) is a cross-sectional view. Move the blade in the direction of the arrow to cut. Specifically, the plate-shaped molded body was cut into a test piece of 80 mm × 80 mm × 10 mm. Using the machining center BM532K manufactured by FNS Co., Ltd., the test piece is shifted by 0.6 mm horizontally, that is, in a direction perpendicular to the row every 80 mm length (referred to as “one row”) under the following conditions. Then, 9 lines were cut without changing the cutting edge. Evaluate whether processing can be achieved without cracking or chipping in the 0.6 mm thick protrusions (hereinafter referred to as ribs) remaining between the cut lines, and count the number of ribs that can be achieved by counting the total number of ribs. Then, the machining achievement rate was calculated.
Tool cutting edge: φ6 carbide end mill
主軸回転数：５，４００ｒｐｍ、送り速度：１０００ｍｍ／分、切り込み深さ：５ｍｍ
（３）曲げ弾性率
４ｍｍ厚の板状に成形した成形体をＪＩＳ Ｋ ７２０３に準拠して測定を行った。
Spindle speed: 5,400 rpm, feed rate: 1000 mm / min, depth of cut: 5 mm
(3) Flexural modulus The molded body molded into a 4 mm thick plate was measured according to JIS K 7203.
（４）難燃性の評価
１ｍｍ厚の板状に成形した成形体をＵＬ−９４燃焼試験に準拠して実施し、難燃性の評価を行った。
(4) Evaluation of flame retardancy A molded body molded into a 1 mm thick plate was carried out in accordance with the UL-94 combustion test, and the flame retardancy was evaluated.
実施例１：
（成形体の作成）
下記表１に示す所定量のポリプロピレン樹脂（日本ポリプロ社製、商品名 ノバテックＰＰ ＥＡ９）、ガラス繊維（日東紡社製）、無機化合物であるマイカ（レプコ社製、平均粒径２７μｍ）、および臭素系難燃剤（鈴裕化学社製、多ベンゼン環臭素系化合物／三酸化アンチモン混合品）酸化防止剤（チバ・ジャパン社製、リン／フェノール系酸化防止剤）を混合し、西村工機（株）製ＮＳ−２００Ｊ（Ｗ）型ロール成形機を用い、１８０℃で添加剤が均一分散するまで溶融混練し、０．７ｍｍ厚のシートを得た。得られたシートを用いて（株）神藤金属工業所製ＡＳＦＡ−７０型単動１サイクル自動成形機により１９０℃、１５分間、５０Ｋｇ/ｃｍ２で加熱加圧プレスし、所定の厚さの板状成形体を得た。得られた樹脂成形体について、上記物性および切削加工性を評価し、その結果を下記表２に示した。
Example 1:
(Creation of molded body)
Predetermined amounts of polypropylene resin (trade name: Novatec PP EA9 manufactured by Nippon Polypro Co., Ltd.), glass fiber (manufactured by Nittobo Co., Ltd.), inorganic compound mica (manufactured by Repco, average particle size 27 μm), and bromine shown in Table 1 below -Based flame retardant (manufactured by Suzuhiro Chemical Co., Ltd., polybenzene ring bromine compound / antimony trioxide mixed product) antioxidant (Ciba Japan Co., Ltd., phosphorus / phenolic antioxidant) mixed, ) NS-200J (W) type roll forming machine manufactured and melt kneaded until the additive was uniformly dispersed at 180 ° C. to obtain a 0.7 mm thick sheet. The obtained sheet was heated and pressed at 190 ° C. for 15 minutes at 50 kg / cm 2 using an ASFA-70 single-acting one-cycle automatic molding machine manufactured by Shindo Metal Industries, Ltd., and a plate having a predetermined thickness. A molded body was obtained. About the obtained resin molding, the said physical property and cutting workability were evaluated, and the result was shown in following Table 2.
実施例２：
ポリプロピレン樹脂を組成の異なるグレード（日本ポリプロ社製、商品名 ノバテックＰＰ ＥＣ９）に変更したこと以外は実施例１と同様にして、板状成形体を得た。得られた樹脂成形体について、実施例１と同様に上記物性および切削加工性を評価し、その結果を下記表２に示した。
Example 2:
A plate-like molded body was obtained in the same manner as in Example 1 except that the polypropylene resin was changed to a grade having a different composition (trade name: Novatec PP EC9, manufactured by Nippon Polypro Co., Ltd.). About the obtained resin molding, the said physical property and cutting workability were evaluated similarly to Example 1, and the result was shown in following Table 2.
実施例３：
ガラス繊維を表面処理剤の異なるグレードに変更したこと以外は実施例１と同様にして、板状成形体を得た。得られた樹脂成形体について、実施例１と同様に上記物性および切削加工性を評価し、その結果を下記表２に示した。
Example 3:
A plate-like molded body was obtained in the same manner as in Example 1 except that the glass fiber was changed to a different grade of the surface treatment agent. About the obtained resin molding, the said physical property and cutting workability were evaluated similarly to Example 1, and the result was shown in following Table 2.
実施例４：
無機化合物であるマイカをタルク（日本タルク社製、平均粒径５μｍ）に変更したこと以外は実施例１と同様にして、板状成形体を得た。得られた樹脂成形体について、実施例１と同様に上記物性および切削加工性を評価し、その結果を下記表２に示した。
Example 4:
A plate-like molded body was obtained in the same manner as in Example 1 except that mica, which was an inorganic compound, was changed to talc (manufactured by Nippon Talc Co., Ltd., average particle size: 5 μm). About the obtained resin molding, the said physical property and cutting workability were evaluated similarly to Example 1, and the result was shown in following Table 2.
比較例１：
ガラス繊維を除いたこと以外は実施例１と同様にして、板状成形体を得た。得られた樹脂成形体について、実施例１と同様に上記物性および切削加工性を評価し、その結果を下記表２に示した。
Comparative Example 1:
A plate-like molded body was obtained in the same manner as in Example 1 except that the glass fiber was removed. About the obtained resin molding, the said physical property and cutting workability were evaluated similarly to Example 1, and the result was shown in following Table 2.
比較例２：
無機化合物であるマイカを除いたこと以外は実施例１と同様にして、板状成形体を得た。得られた樹脂成形体について、実施例１と同様に上記物性および切削加工性を評価し、その結果を下記表２に示した。
Comparative Example 2:
A plate-like molded body was obtained in the same manner as in Example 1 except that mica, which was an inorganic compound, was removed. About the obtained resin molding, the said physical property and cutting workability were evaluated similarly to Example 1, and the result was shown in following Table 2.
比較例３：
臭素系難燃剤を除いたこと以外は実施例１と同様にして、板状成形体を得た。得られた樹脂成形体について、実施例１と同様に上記物性および切削加工性を評価し、その結果を下記表２に示した。
Comparative Example 3:
A plate-like molded body was obtained in the same manner as in Example 1 except that the brominated flame retardant was removed. About the obtained resin molding, the said physical property and cutting workability were evaluated similarly to Example 1, and the result was shown in following Table 2.
比較例４：
ＰＥＴ１００重量部に繊維強化剤としてガラス繊維、粒状無機化合物としてマイカおよび日本板硝子（株）製顆粒状ガラスフレークと難燃剤として臭素化ポリスチレンを所定の配合比で配合調整し、２軸押出機を用いて溶融混練し、ストランド状に押出してペレットを得た。得られたペレットをＴダイを用いた押出シート成形装置にて、厚み１．０ｍｍのシートに成形した。これらの押出成形シートを２０段の多段プレス機にて所定枚数重ね、圧力４０ｋｇ／ｃｍ２で常温〜１８０℃まで昇温速度５℃／分で昇温し、１５分保持後速やかに冷却して積層板を得た。得られた樹脂成形体について、実施例１と同様に上記切削加工性を評価し、その結果を下記表２に示した。
Comparative Example 4:
Mixing and adjusting glass fiber as a fiber reinforcing agent to 100 parts by weight of PET, mica and granular glass flakes manufactured by Nippon Sheet Glass Co., Ltd., and brominated polystyrene as a flame retardant at a predetermined mixing ratio, and using a twin screw extruder Were melt-kneaded and extruded into strands to obtain pellets. The obtained pellets were formed into a 1.0 mm thick sheet by an extrusion sheet forming apparatus using a T die. A predetermined number of these extrusion-molded sheets are stacked in a 20-stage multi-stage press, heated at a temperature rise rate of 5 ° C./min from room temperature to 180 ° C. at a pressure of 40 kg / cm 2, held for 15 minutes, and then quickly cooled and laminated. I got a plate. About the obtained resin molding, the said cutting workability was evaluated similarly to Example 1, and the result was shown in Table 2 below.
比較例１の樹脂成形体は、ガラス繊維を含有しないため、曲げ弾性率が５０００ＭＰａ以上を達成しなかった。比較例２の樹脂成形体は、無機化合物であるマイカを含有しないため、曲げ弾性率が５０００ＭＰａ以上を達成しなかった。また、難燃性に関しても、Ｖ−０レベルを達成しなかった。比較例３の樹脂成形体は、臭素系難燃剤を含有しないため、難燃性に関してＶ−０レベルを達成しなかった。これに対し、実施例１〜４の成形体は、比較例４の成形体と同等の寸法安定性を有するものであった。特に、実施例１の樹脂成形体は比較例４の樹脂成形体と比較して、切削性に関し加工達成率が大きく向上する結果となった。 Since the resin molded body of Comparative Example 1 did not contain glass fiber, the flexural modulus did not achieve 5000 MPa or more. Since the resin molded body of Comparative Example 2 did not contain mica which is an inorganic compound, the flexural modulus did not achieve 5000 MPa or more. Moreover, V-0 level was not achieved regarding the flame retardance. Since the resin molded product of Comparative Example 3 did not contain a brominated flame retardant, the V-0 level was not achieved with respect to flame retardancy. On the other hand, the molded bodies of Examples 1 to 4 had the same dimensional stability as the molded body of Comparative Example 4. In particular, as compared with the resin molded body of Comparative Example 4, the resin molded body of Example 1 resulted in a significant improvement in the processing achievement rate with respect to machinability.
本発明の板状成形物は、例えば、各種工業材料の製造ラインにおける部材や絶縁部材などとして好適に利用することができる。 The plate-shaped molded product of the present invention can be suitably used, for example, as a member or an insulating member in a production line for various industrial materials.
すなわち、本発明の要旨は、ガラス繊維、無機化合物、および臭素系難燃剤を含有するポリプロピレン樹脂組成物からなる成形体であり、当該成形体のＭＤ方向の線膨張係数が３．５以下であることを特徴とする成形体に存する。 That is, the gist of the present invention is a molded article made of a polypropylene resin composition containing glass fiber, an inorganic compound, and a brominated flame retardant, and the linear expansion coefficient in the MD direction of the molded article is 3.5 or less. It exists in the molded object characterized by this.
Claims (5)
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