JPH07196822A - Fiber-reinforced thermoplastic resin sheet and its production - Google Patents
Fiber-reinforced thermoplastic resin sheet and its productionInfo
- Publication number
- JPH07196822A JPH07196822A JP5338651A JP33865193A JPH07196822A JP H07196822 A JPH07196822 A JP H07196822A JP 5338651 A JP5338651 A JP 5338651A JP 33865193 A JP33865193 A JP 33865193A JP H07196822 A JPH07196822 A JP H07196822A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- thermoplastic resin
- fiber
- surface layer
- layer portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Reinforced Plastic Materials (AREA)
- Laminated Bodies (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、圧縮成形用の材料とし
て使用される繊維強化熱可塑性樹脂シートおよびその製
造法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber reinforced thermoplastic resin sheet used as a material for compression molding and a method for producing the same.
【０００２】[0002]
【従来の技術】繊維強化熱可塑性樹脂シート（通称、ス
タンパブルシート）から成形品を製造する場合、所定の
寸法に切断されたシート（以下、ブランクと言う）を熱
可塑性樹脂の融点以上に加熱して可塑化させた後、圧縮
成形金型に投入し成形する。この際の加熱過程におい
て、ブランクの樹脂が過熱されて酸化劣化し、著しい分
子量低下を来すことがある。このような問題に対処し、
一般に、繊維強化熱可塑性樹脂シートの製造に際して、
使用する熱可塑性樹脂の中に酸化防止剤を添加して樹脂
の耐熱性を高めている。2. Description of the Related Art When a molded product is manufactured from a fiber reinforced thermoplastic resin sheet (commonly called a stampable sheet), a sheet (hereinafter referred to as a blank) cut into a predetermined size is heated to a temperature equal to or higher than the melting point of the thermoplastic resin. After being plasticized, it is put into a compression mold and molded. In the heating process at this time, the blank resin may be overheated and oxidatively deteriorated, resulting in a remarkable decrease in molecular weight. Address these issues,
Generally, when manufacturing a fiber-reinforced thermoplastic resin sheet,
An antioxidant is added to the thermoplastic resin used to increase the heat resistance of the resin.
【０００３】なお、樹脂が過熱されて酸化劣化する度合
は、樹脂の種類や加熱炉の型式によっても異なる。樹脂
の種類がポリプロピレンである場合、特に酸化劣化が起
こり易い。また、ブランクの加熱に際しては、多くの場
合には遠赤外線ヒーター炉が使用されるが、この遠赤外
線ヒーター炉を使用すると、他の炉を使用した場合より
も、樹脂が過熱される度合が大きく現れる。The degree to which the resin is overheated and oxidatively deteriorated depends on the type of the resin and the type of the heating furnace. When the type of resin is polypropylene, oxidative deterioration is particularly likely to occur. In addition, when heating a blank, a far-infrared heater furnace is often used, but when this far-infrared heater furnace is used, the degree to which the resin is overheated is greater than when other furnaces are used. appear.
【０００４】[0004]
【発明が解決しようとする課題】ブランクが加熱される
過程において、ブランクは表面から順次昇温するので、
表層部から内層部の中心に向かって下り勾配の温度差が
生じ、この温度差は加熱終了の時点まで存在する。この
ため、表層部の樹脂の温度が融点に達した時点において
も、中心部分では融点まで昇温していないので、中心部
分が融点に到達した時点においては、表層部の樹脂は過
熱された状態になる。In the process of heating the blank, the temperature of the blank gradually rises from the surface.
A downward temperature difference occurs from the surface layer portion toward the center of the inner layer portion, and this temperature difference exists until the end of heating. Therefore, even when the temperature of the resin in the surface layer reaches the melting point, since the temperature has not risen to the melting point in the central portion, the resin in the surface layer is in a state of being overheated at the time when the central portion reaches the melting point. become.
【０００５】このような温度差は、主としてガラス繊維
の存在によって引き起こされる。表層部の樹脂の温度が
融点に達すると、ブランクの中に閉じ込められていたガ
ラス繊維が樹脂による拘束から解放され、ブランクの厚
み方向に膨張する。このガラス繊維の膨張によって、ブ
ランクの中に空気が混入し、ガラス繊維が存在する箇所
が膨張する。このため、ガラス繊維が存在する箇所が断
熱作用をなし、表層部と内層部の温度差は非常に大きく
なる。Such temperature difference is mainly caused by the presence of glass fibers. When the temperature of the resin in the surface layer reaches the melting point, the glass fibers trapped in the blank are released from the constraint by the resin and expand in the thickness direction of the blank. Due to the expansion of the glass fiber, air is mixed into the blank, and the portion where the glass fiber is present expands. For this reason, the portion where the glass fiber is present has a heat insulating effect, and the temperature difference between the surface layer portion and the inner layer portion becomes very large.
【０００６】図１は本発明者らが繊維強化熱可塑性樹脂
シートの昇温特性を測定した結果の一例を示す図であ
る。この繊維強化熱可塑性樹脂シートは樹脂がポリプロ
ピレン、強化繊維がガラス繊維よりなる３．８mmのシー
トで、ガラス繊維の含有率は４０％であった。図１にお
けるブランクの昇温状況をみると、表面の温度が樹脂の
融点である１６５℃〜１７０℃以上になると、表面と中
心の温度の差は大きくなる。このため、中心の温度を樹
脂の融点以上に上げなければならないと言う必要性があ
る以上、表面の樹脂が過熱されるのは避けられない。FIG. 1 is a diagram showing an example of the results of the measurement by the present inventors of the temperature rising characteristics of a fiber reinforced thermoplastic resin sheet. This fiber-reinforced thermoplastic resin sheet was a 3.8 mm sheet in which the resin was polypropylene and the reinforcing fibers were glass fibers, and the glass fiber content was 40%. Looking at the temperature rise condition of the blank in FIG. 1, when the temperature of the surface becomes 165 ° C. to 170 ° C., which is the melting point of the resin, the difference between the temperature of the surface and the center becomes large. Therefore, it is inevitable that the resin on the surface is overheated because it is necessary to raise the temperature of the center to the melting point of the resin or higher.
【０００７】しかし、上記従来技術の繊維強化熱可塑性
樹脂シートにおいては、その樹脂中に添加されている酸
化防止剤の割合は、厚さ方向に関係なく全層一様になっ
ている。また、その繊維強化熱可塑性樹脂シートを製造
する際に使用する総ての樹脂材には、同じ割合で酸化防
止剤が添加されている。このため、次のように、成形品
の強度や成形流動性が低下すると言う問題がある。However, in the above-mentioned conventional fiber-reinforced thermoplastic resin sheet, the proportion of the antioxidant added to the resin is uniform in all layers regardless of the thickness direction. Further, an antioxidant is added in the same proportion to all the resin materials used when manufacturing the fiber reinforced thermoplastic resin sheet. Therefore, there is a problem that the strength and the molding fluidity of the molded product are reduced as follows.
【０００８】充分な耐熱性を得るためには、多量の酸
化防止剤を添加する必要があり、この多量の酸化防止剤
の存在によって、樹脂と強化繊維との濡れ性が阻害さ
れ、成形品の強度が低下する。In order to obtain sufficient heat resistance, it is necessary to add a large amount of antioxidant, and the presence of this large amount of antioxidant hinders the wettability between the resin and the reinforcing fiber, and Strength is reduced.
【０００９】また、多量の酸化防止剤の存在によっ
て、樹脂の溶融粘度が高くなり、成形時の流動性が低下
する。この結果、成形品での欠肉（いわゆるショートシ
ョット）が起きやすくなる。Further, the presence of a large amount of the antioxidant increases the melt viscosity of the resin and reduces the fluidity during molding. As a result, lack of thickness (so-called short shot) is likely to occur in the molded product.
【００１０】本発明は、上記の問題点を解決し、成形前
の加熱時における樹脂の酸化劣化が起こらず、成形流動
性が優れ、強度の大きい成形品が得られる繊維強化熱化
塑性樹脂シートおよびその製造法を提供することを目的
とする。The present invention solves the above-mentioned problems, does not cause oxidative deterioration of the resin during heating before molding, has excellent molding fluidity, and is a fiber-reinforced thermoplastic resin sheet having high strength. And its manufacturing method.
【００１１】[0011]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明の繊維強化熱可塑性樹脂シートにおいて
は、表層部の樹脂と内層部の樹脂が同種類の熱可塑性樹
脂であって、且つ表層部の樹脂の重量減少開始温度と内
層部の樹脂の重量減少開始温度が下記（１）式を満足す
る関係にあることを特徴としている。In order to achieve the above object, in the fiber-reinforced thermoplastic resin sheet of the present invention, the resin of the surface layer portion and the resin of the inner layer portion are the same kind of thermoplastic resin, Further, it is characterized in that the weight reduction start temperature of the resin in the surface layer portion and the weight reduction start temperature of the resin in the inner layer portion have a relationship satisfying the following expression (1).
【００１２】[0012]
【数４】 [Equation 4]
【００１３】また、繊維強化熱可塑性樹脂シートの製造
法に係る第１の発明においては、熱可塑性樹脂よりなる
表層部用樹脂フィルムとこの表層部用樹脂フィルムと同
種類の熱可塑性樹脂よりなり且つその重量減少開始温度
が下記（１）式を満足する内層部用樹脂材並びに強化繊
維マットを材料とし、次の工程の順序で実施することを
特徴としている。 （Ａ）内層部用の樹脂材と強化繊維マットを重ね合わ
せ、（Ｂ）Ａ工程で重ね合わせた積層物の両側に表層部
用の樹脂フィルムを重ね、（Ｃ）Ｂ工程で重ね合わせた
積層物を加熱し、加圧して板状体にし、（Ｄ）この板状
体を冷却すると共に加圧する 上記Ａ工程における内層部用の樹脂材としては、熱可塑
性樹脂のフィルム、溶融させた熱可塑性樹脂を膜状に形
成させたもの等を使用する。In the first invention relating to the method for producing a fiber reinforced thermoplastic resin sheet, the surface layer resin film made of a thermoplastic resin and the same kind of thermoplastic resin as the surface layer resin film are used. The present invention is characterized in that the resin material for the inner layer and the reinforcing fiber mat satisfying the following formula (1) are used as materials for the weight reduction start temperature, and the steps are performed in the following order. (A) The resin material for the inner layer portion and the reinforcing fiber mat are overlaid, (B) the resin film for the surface layer portion is overlaid on both sides of the overlaid laminate in step A, and (C) the overlaid laminate in step B. The object is heated and pressed to form a plate, and (D) the plate is cooled and pressed. Examples of the resin material for the inner layer portion in the step A include a thermoplastic resin film and a melted thermoplastic resin. A resin-like film is used.
【００１４】[0014]
【数５】 [Equation 5]
【００１５】そして、繊維強化熱可塑性樹脂シートの製
造法に係る第２の発明においては、熱可塑性樹脂よりな
る表層部用樹脂フィルム並びにこの表層部用樹脂フィル
ムと同種類の熱可塑性樹脂であり且つその重量減少開始
温度が下記（１）式を満足する樹脂と強化繊維よりなる
強化繊維入り樹脂シート材を材料とし、次の工程の順序
で実施することを特徴ととしている。 （Ａ）強化繊維入り樹脂シート材の両側に表層部用の樹
脂フィルムを重ね、（Ｂ）Ａ工程で重ね合わせた積層物
を加熱し、加圧して板状体にし、（Ｃ）この板状体を冷
却すると共に加圧する 上記Ａ工程における強化繊維入り樹脂シート材として
は、熱可塑性樹脂と強化繊維よりなるシート材、溶融さ
せた熱可塑性樹脂中に強化繊維を分散させたシート形状
のもの等を使用する。In the second invention relating to the method for producing a fiber-reinforced thermoplastic resin sheet, the resin film for the surface layer portion made of the thermoplastic resin and the same kind of thermoplastic resin as the resin film for the surface layer portion are used. It is characterized in that a resin sheet material containing a reinforcing fiber composed of a resin and a reinforcing fiber whose weight reduction starting temperature satisfies the following formula (1) is used as a material, and the steps are performed in the following order. (A) A resin film for the surface layer portion is laminated on both sides of the resin sheet material containing reinforcing fibers, (B) the laminate laminated in the step A is heated and pressed into a plate-like body, and (C) this plate-like body As the resin sheet material containing reinforcing fibers in the above step A for cooling and pressurizing the body, a sheet material composed of a thermoplastic resin and reinforcing fibers, a sheet-shaped material in which reinforcing fibers are dispersed in a melted thermoplastic resin, etc. To use.
【００１６】[0016]
【数６】 [Equation 6]
【００１７】[0017]
【作用】本発明においては、ブランクの表層部の樹脂が
過熱され、酸化劣化され易いことに着目し、表層部の樹
脂を内層部の樹脂よりも耐熱性の高いものにしている。
この樹脂の耐熱性の度合は、熱重量減少法（ＪＩＳ Ｋ
７１２０）によって測定した重量減少開始温度の値によ
って定め、その調整は酸化防止剤の種類や添加量を変え
ることによって行なった。そして、試験結果によれば、
表層部の樹脂の重量減少開始温度と内層部の樹脂の重量
減少開始温度との差（ＴＳ−ＴＣ）が５℃未満である
と、表層部の樹脂の酸化劣化を防止する効果は殆ど現れ
ない。In the present invention, attention is paid to the fact that the resin of the blank surface layer portion is easily overheated and oxidatively deteriorated, and the resin of the surface layer portion has higher heat resistance than the resin of the inner layer portion.
The degree of heat resistance of this resin is determined by the thermogravimetric reduction method (JIS K
7120), and the adjustment was performed by changing the type and addition amount of the antioxidant. And according to the test results,
When the difference (TS-TC) between the weight reduction start temperature of the resin in the surface layer portion and the resin weight reduction start temperature in the inner layer portion is less than 5 ° C., the effect of preventing the oxidation deterioration of the resin in the surface layer portion hardly appears. .
【００１８】[0018]
（実施例１）市販のガラス繊維チョップドストランド
（繊維長１３ｍｍ、繊維径１３μｍ、集束本数８００
本）を平面上に均一に散布した後、ニードルパンチによ
って機械的に繊維同士を結合し、目付量９７０g/m2のガ
ラス繊維マットを作製した。(Example 1) Commercially available glass fiber chopped strand (fiber length 13 mm, fiber diameter 13 μm, number of bundles 800)
This was uniformly dispersed on a flat surface, and then the fibers were mechanically bonded to each other by needle punching to produce a glass fiber mat having a basis weight of 970 g / m 2 .
【００１９】樹脂としては、ポリプロピレン（日本石油
化学（株）製，商品名ＸＪ２００１，ＭＩ＝６０）を基
本樹脂とし、これに、適宜、酸化防止剤を添加して表層
部用の樹脂および内層部用の樹脂を調製した。As the resin, polypropylene (manufactured by Nippon Petrochemical Co., Ltd., trade name XJ2001, MI = 60) is used as a basic resin, and an antioxidant is appropriately added to the basic resin, and the resin for the surface layer and the inner layer are used. A resin for use was prepared.
【００２０】内層部用の樹脂は、上記ポリプロピレンに
ヒンダートフェノール系酸化防止剤（チバガイギー製，
商品名ＩＲＧＡＮＯＸ １０１０、以下、酸化防止剤Ａ
と言う）１０００ppm、およびＤＳＴＤＰと呼ばれる硫
黄系酸化防止剤（ジステアリル−３−３’−４チオジプ
ロピネート、住友化学（株）製，商品名Ｓｕｍｉｌｉｅ
ｒ ＴＰＳ、以下、酸化防止剤Ｃと言う）２０００ppm
を添加して調製した。この樹脂の重量減少開始温度ＴＳ
は２４８℃であった。The resin for the inner layer is made of the above polypropylene and a hindered phenolic antioxidant (made by Ciba Geigy,
Product name IRGANOX 1010, below, antioxidant A
1000 ppm, and a sulfur-based antioxidant called DSTDP (distearyl-3-3′-4 thiodipropinate, manufactured by Sumitomo Chemical Co., Ltd., trade name Sumlie)
r TPS, hereinafter referred to as antioxidant C) 2000ppm
Was added to prepare. Weight reduction start temperature TS of this resin
Was 248 ° C.
【００２１】表層部用の樹脂は、上記ポリプロピレンに
上記酸化防止剤Ａを２０００ppmと、燐系酸化防止剤
（チバガイギー製，商品名ＩＲＧＡＦＯＳ １６８、以
下、酸化防止剤Ｂと言う）１０００ppm、及び上記酸化
防止剤Ｃ２０００ppmを添加して調製した。この樹脂の
重量減少開始温度ＴＣは２５５℃であった。上記の数値
をまとめ、表１に示す。As the resin for the surface layer portion, 2000 ppm of the above antioxidant A is added to the above polypropylene, 1000 ppm of a phosphorus-based antioxidant (manufactured by Ciba-Geigy, trade name IRGAFOS 168, hereinafter referred to as antioxidant B), and the above oxidation. Prepared by adding 2000 ppm of inhibitor C. The weight loss start temperature TC of this resin was 255 ° C. The above numerical values are summarized and shown in Table 1.
【００２２】[0022]
【表１】 [Table 1]
【００２３】次いで、内層部用樹脂材としてそのフィル
ムを使用し、図２に示すように、ガラス繊維マット１、
内層部用樹脂フィルム２、表層部用樹脂フィルム３を重
ね合わせた。すなわち、１．６mmの内層部用樹脂フィル
ム２ａの両側にガラス繊維マット１を配置し、次いで、
各ガラス繊維マット１の外側に０．５mmの内層部用樹脂
フィルム２ｂを配置し、さらに、各内層部用樹脂フィル
ム２ｂの外側に０．３０mmの表層部用樹脂フィルム３を
配置した積層物にした。この際、積層物の総重量は目付
量で約２９００g/m2であった。Then, using the film as a resin material for the inner layer, as shown in FIG. 2, the glass fiber mat 1,
The resin film 2 for the inner layer portion and the resin film 3 for the surface layer portion were laminated. That is, the glass fiber mat 1 is arranged on both sides of the 1.6 mm inner layer resin film 2a, and then,
0.5 mm inner layer resin film 2b is placed on the outside of each glass fiber mat 1, and 0.30 mm surface layer resin film 3 is placed on the outer side of each inner layer resin film 2b. did. At this time, the total weight of the laminate was about 2900 g / m 2 in terms of basis weight.
【００２４】そして、この積層物を厚さ４mmのスペーサ
ーと共に２mmのステンレス板２枚の間に挟み、２００℃
に加熱されているプレス盤で５分間加圧した後、水冷さ
れているプレス盤内で３分間加圧した。加圧力は10 kgf
/cm2となるようにした。このようにして、厚さ４mmで、
ガラス繊維含有率４０重量％の繊維強化熱可塑性樹脂シ
ートを得た。Then, the laminate is sandwiched between two 2 mm stainless steel plates together with a spacer having a thickness of 4 mm, and the temperature is 200 ° C.
After pressurizing for 5 minutes with a press board heated to 1, the pressurizing machine was pressed for 3 minutes in a water-cooled press board. Pressure is 10 kgf
It was set to be / cm 2 . In this way, with a thickness of 4 mm,
A fiber reinforced thermoplastic resin sheet having a glass fiber content of 40% by weight was obtained.
【００２５】この繊維強化熱可塑性樹脂シートについて
は、各種の試験を行なった。まず、耐熱性は次のように
して評価した。上記繊維強化熱可塑性樹脂シートを１５
０mm×１５０mmのブランクに切断し、このブランクを移
動するコンベア上に載せて、炉内雰囲気温度２２０℃の
遠赤外線ヒーター炉（日本ガイシ製，商品名インフラス
タイン，ヒーター温度３４０〜３６０℃）内に入れた。
炉の入口からブランクを観察して、ブランクの表面また
は切断した端部から樹脂の熱劣化による発煙が起こり始
めるまでの時間を測定した。この測定は同一の繊維強化
熱可塑性樹脂シートから切り出したブランクで５回測定
を行なった。その結果、発煙開始までの時間の平均値は
５．５分であった。また、上記繊維強化熱可塑性樹脂シ
ートから１５mm×１２０mmのサンプルを切り出し、曲げ
強度を測定したところ、１４．０ kgf/mm2であった。Various tests were conducted on the fiber-reinforced thermoplastic resin sheet. First, the heat resistance was evaluated as follows. The above fiber reinforced thermoplastic resin sheet is used for 15
Cut into a blank of 0 mm x 150 mm, place this blank on a moving conveyor, and put it in a far infrared heater furnace (manufactured by NGK Insulators, brand name Infrastein, heater temperature 340 to 360 ° C) with a furnace atmosphere temperature of 220 ° C. I put it in.
The blank was observed from the entrance of the furnace, and the time from the surface of the blank or the cut end to the start of smoke generation due to thermal deterioration of the resin was measured. This measurement was performed 5 times with a blank cut from the same fiber-reinforced thermoplastic resin sheet. As a result, the average value of the time until the start of smoking was 5.5 minutes. Further, a 15 mm × 120 mm sample was cut out from the above fiber reinforced thermoplastic resin sheet, and the bending strength was measured and found to be 14.0 kgf / mm 2 .
【００２６】さらに、上記繊維強化熱可塑性樹脂シート
から１００mm×１００mmのブランク２枚を切り出し、上
記の遠赤外線ヒーター炉内で、ブランク中心部の温度が
約１８０℃になるまで加熱した後、シャーエッジ構造の
圧縮成形用の金型内に重ねてチャージして、荷重１０to
n（投影面における単位面積当たりの圧力１００kgf/cm
2 ）で３０秒加圧し、図３に示す形状および寸法のリブ
付成形品を得た。得られた成形品を調べたところ、リブ
部１１（厚さ１mm、高さ６０mm）の先端まで材料が充填
されており、その成形流動性は良好であった。上記の評
価結果を表２に示す。Further, two 100 mm × 100 mm blanks were cut out from the above fiber reinforced thermoplastic resin sheet and heated in the far infrared heater furnace until the temperature of the blank center portion reached about 180 ° C., then the shear edge Charged by stacking and charging in the mold for compression molding of the structure
n (pressure per unit area on the projection surface 100 kgf / cm
2 ) and pressure was applied for 30 seconds to obtain a ribbed molded product having the shape and dimensions shown in FIG. When the obtained molded product was examined, the material was filled up to the tip of the rib portion 11 (thickness 1 mm, height 60 mm), and its molding fluidity was good. Table 2 shows the above evaluation results.
【００２７】[0027]
【表２】 [Table 2]
【００２８】（実施例２）表１に示す内層部用樹脂のフ
ィルム及び表層部用樹脂のフィルムを使用し、内層部用
樹脂フィルム２ｂを０．７５mmにし、表層部用樹脂フィ
ルム３を０．０５mmにしたこと以外は実施例１と同様に
して繊維強化熱可塑性樹脂シートを製造した。得られた
繊維強化熱可塑性樹脂シートの評価試験結果は表２に示
す。 （実施例３）表層部用樹脂フィルム３を０．３０mmにし
たこと以外は実施例２と同様にして繊維強化熱可塑性樹
脂シートを製造した。この評価試験の結果は表２に示
す。Example 2 Using the resin film for the inner layer and the resin film for the surface layer shown in Table 1, the resin film 2b for the inner layer was 0.75 mm, and the resin film 3 for the surface layer was 0. A fiber reinforced thermoplastic resin sheet was produced in the same manner as in Example 1 except that the thickness was set to 05 mm. The evaluation test results of the obtained fiber reinforced thermoplastic resin sheet are shown in Table 2. (Example 3) A fiber-reinforced thermoplastic resin sheet was produced in the same manner as in Example 2 except that the surface layer resin film 3 was 0.30 mm. The results of this evaluation test are shown in Table 2.
【００２９】（比較例１）表１に示すように、内層部用
樹脂フィルム２ａ，２ｂと表層部用樹脂フィルム３の樹
脂を同じにしたこと以外は実施例１と同様にして繊維強
化熱可塑性樹脂シートを製造した。評価試験の結果は表
２に示す。 （比較例２）表１に示す樹脂を使用したこと以外は実施
例１と同様にして繊維強化熱可塑性樹脂シートを製造し
た。この評価試験の結果は表２に示す。 （比較例３）表１に示すように、内層部用樹脂フィルム
２ａ，２ｂと表層部用樹脂フィルム３の樹脂を同じにし
たこと以外は実施例１と同様にして繊維強化熱可塑性樹
脂シートを製造した。この評価試験の結果は表２に示
す。Comparative Example 1 As shown in Table 1, the fiber-reinforced thermoplastic resin was prepared in the same manner as in Example 1 except that the resin for the inner layer resin films 2a and 2b and the resin for the outer layer resin film 3 were the same. A resin sheet was manufactured. The results of the evaluation test are shown in Table 2. (Comparative Example 2) A fiber-reinforced thermoplastic resin sheet was produced in the same manner as in Example 1 except that the resins shown in Table 1 were used. The results of this evaluation test are shown in Table 2. (Comparative Example 3) As shown in Table 1, a fiber-reinforced thermoplastic resin sheet was prepared in the same manner as in Example 1 except that the resin for the inner layer resin films 2a and 2b and the resin for the surface layer resin 3 were the same. Manufactured. The results of this evaluation test are shown in Table 2.
【００３０】実施例１〜３および比較例１〜３の評価試
験結果をまとめた表２について説明する。この表におい
て、比較例１の値は代表的な従来技術による結果であ
り、この欄の値を他の試験結果を評価する場合の基準に
している。その一つとして、ブランクの発煙開始時間の
欄における効果の記載は、その測定値が比較例１の値よ
りも０．５分以上大きかった場合には「あり」とし、
０．５分以下場合には「なし」とした。Table 2 which summarizes the evaluation test results of Examples 1 to 3 and Comparative Examples 1 to 3 will be described. In this table, the value of Comparative Example 1 is a result of a typical conventional technique, and the values in this column are used as a reference when evaluating other test results. As one of them, the description of the effect in the column of blank smoke generation start time is "Yes" when the measured value is larger than the value of Comparative Example 1 by 0.5 minutes or more,
When it was 0.5 minutes or less, it was set to "none".
【００３１】まず、比較例１、比較例２の結果におい
て、曲げ強度および充填高さは良好であるが、樹脂の酸
化劣化の指標である発煙開始時間の値が非常に小さく、
総合評価としては好ましいものではない。First, in the results of Comparative Examples 1 and 2, the bending strength and the filling height are good, but the value of the smoke generation start time, which is an index of the oxidative deterioration of the resin, is very small,
It is not preferable as a comprehensive evaluation.
【００３２】以下、各例ごとにみると、実施例１〜３で
は総ての評価項目が比較例１の値を上回っているか、少
なくともそれに近い値が得られている。このように、繊
維強化熱可塑性樹脂シート全体にわたって酸化防止剤が
多量に存在していなくても、表層部の樹脂中に存在する
酸化防止剤の量が多ければ、良好な結果が得られる。実
施例３において、曲げ強さと充填高さが若干低くなって
いるが、この差は許容しうる範囲であると考える。実施
例３の曲げ強さと充填高さが低いのは、酸化防止剤が多
量に添加されている表層部用樹脂（重量減少開始温度２
８０℃）を実施例２よりも厚くしたため、添加された酸
化防止剤の総量が多くなり、その結果、樹脂の濡れ性お
よび流動性が低下したものである。In each of the following examples, in each of Examples 1 to 3, all the evaluation items exceeded the value of Comparative Example 1, or at least values close to it were obtained. Thus, even if the antioxidant is not present in a large amount over the entire fiber-reinforced thermoplastic resin sheet, good results can be obtained if the amount of the antioxidant present in the resin of the surface layer portion is large. In Example 3, the bending strength and the filling height are slightly lower, but it is considered that this difference is within an allowable range. The bending strength and the filling height of Example 3 are low because the resin for the surface layer portion in which a large amount of the antioxidant is added (the weight reduction starting temperature 2
80 ° C.) was made thicker than in Example 2, so that the total amount of the added antioxidant was large, and as a result, the wettability and fluidity of the resin were lowered.
【００３３】比較例３において、重量減少開始温度の値
が大きく、樹脂の酸化劣化は防止されているが、曲げ強
さと充填高さが極めて悪い。上述のように、シート表層
のごく薄い部分にだけ多量の酸化防止剤を存在させれ
ば、樹脂の酸化劣化は防ぐことができるので、成形時の
成形性や成形品の強度特性が損なわれない上に、全体と
しての酸化防止剤の添加量はそれ程多くならず、高価な
薬剤の節減によって製造コストの上昇が抑えられる。In Comparative Example 3, the value of the weight reduction start temperature is large and the oxidation deterioration of the resin is prevented, but the bending strength and the filling height are extremely poor. As described above, if a large amount of the antioxidant is present only in the very thin portion of the sheet surface layer, the oxidative deterioration of the resin can be prevented, so that the moldability during molding and the strength characteristics of the molded product are not impaired. In addition, the amount of the antioxidant added as a whole is not so large, and the increase of the manufacturing cost can be suppressed by saving the expensive chemicals.
【００３４】[0034]
【発明の効果】本発明は、耐熱性が異なると表層部の樹
脂と内層部の樹脂によって形成され、表層部の樹脂の重
量減少開始温度が内層部の樹脂の重量減少開始温度より
も５℃以上高い繊維強化熱可塑性樹脂シート、およびそ
の製造法である。According to the present invention, when the heat resistance is different, it is formed by the resin of the surface layer portion and the resin of the inner layer portion, and the weight reduction start temperature of the resin of the surface layer portion is 5 ° C. higher than the weight reduction start temperature of the resin of the inner layer portion. The above is a high fiber-reinforced thermoplastic resin sheet and a method for producing the same.
【００３５】本発明の繊維強化熱可塑性樹脂シートおよ
び本発明の製造法によって製造された繊維強化熱可塑性
樹脂シートを使用すれば、樹脂が酸化劣化され易い表層
部だけについて重量減少開始温度が高くなるようにして
耐熱性を向上させているので、成形時の成形流動性や成
形品の強度特性が損なわれることなく、樹脂の酸化劣化
を防ぐことができる。When the fiber reinforced thermoplastic resin sheet of the present invention and the fiber reinforced thermoplastic resin sheet produced by the production method of the present invention are used, the weight reduction start temperature becomes high only in the surface layer portion where the resin is easily oxidatively deteriorated. Since the heat resistance is improved in this manner, the oxidative deterioration of the resin can be prevented without impairing the molding fluidity during molding and the strength characteristics of the molded product.
【図１】本発明者らが繊維強化熱可塑性樹脂シートの昇
温特性を測定した結果の一例を示す図である。FIG. 1 is a diagram showing an example of a result of measurement by the present inventors of temperature rise characteristics of a fiber reinforced thermoplastic resin sheet.
【図２】本発明の一実施例の繊維強化熱可塑性樹脂シー
トを製造する際において、材料を重ね合わせた状態を示
す説明図である。FIG. 2 is an explanatory view showing a state in which materials are overlapped with each other when manufacturing the fiber-reinforced thermoplastic resin sheet according to the embodiment of the present invention.
【図３】成形流動性を評価するための試験で作られる成
形品の斜視図である。FIG. 3 is a perspective view of a molded product made in a test for evaluating molding fluidity.
１ ガラス繊維マット ２ａ，２ｂ 内層部用樹脂フィルム ３ 表層部用樹脂フィルム １０ 底部 １１ リブ 1 Glass Fiber Mat 2a, 2b Resin Film for Inner Layer 3 Resin Film for Surface Layer 10 Bottom 11 Rib
フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｂ２９Ｃ 43/02 7365−4Ｆ Ｂ２９Ｋ 101:12 105:06 Ｂ２９Ｌ 9:00 Continuation of the front page (51) Int.Cl. 6 Identification number Reference number within the agency FI technical display location // B29C 43/02 7365-4F B29K 101: 12 105: 06 B29L 9:00
Claims (3)
強化熱可塑性樹脂シートにおいて、表層部の樹脂と内層
部の樹脂が同種類の熱可塑性樹脂であって、且つ前記表
層部の樹脂の重量減少開始温度と前記内層部の樹脂の重
量減少開始温度が下記（１）式を満足する関係にあるこ
とを特徴とする繊維強化熱可塑性樹脂シート。 【数１】 1. A fiber-reinforced thermoplastic resin sheet used as a material for compression molding, wherein the surface layer resin and the inner layer resin are the same type of thermoplastic resin, and the weight of the surface layer resin is A fiber-reinforced thermoplastic resin sheet, characterized in that the reduction start temperature and the weight reduction start temperature of the resin in the inner layer portion have a relationship satisfying the following expression (1). [Equation 1]
強化熱可塑性樹脂シートの製造法において、熱可塑性樹
脂よりなる表層部用樹脂フィルムとこの表層部用樹脂フ
ィルムと同種類の熱可塑性樹脂よりなり且つその重量減
少開始温度が下記（１）式を満足する内層部用樹脂材並
びに強化繊維マットを材料とし、次の工程の順序で実施
することを特徴とする繊維強化熱可塑性樹脂シートの製
造法。 （Ａ）内層部用の樹脂材と強化繊維マットを重ね合わ
せ、（Ｂ）Ａ工程で重ね合わせた積層物の両側に表層部
用の樹脂フィルムを重ね、（Ｃ）Ｂ工程で重ね合わせた
積層物を加熱し、加圧して板状体にし、（Ｄ）この板状
体を冷却すると共に加圧する 【数２】 2. A method for producing a fiber-reinforced thermoplastic resin sheet used as a material for compression molding, comprising: a resin film for a surface layer portion made of a thermoplastic resin; and a thermoplastic resin of the same kind as the resin film for the surface layer portion. And a weight loss starting temperature satisfying the following formula (1), using a resin material for inner layer and a reinforced fiber mat as materials, and performing the following steps in order: manufacture of a fiber reinforced thermoplastic resin sheet Law. (A) The resin material for the inner layer portion and the reinforcing fiber mat are overlaid, (B) the resin film for the surface layer portion is overlaid on both sides of the overlaid laminate in step A, and (C) the overlaid laminate in step B. An object is heated and pressed to form a plate, and (D) this plate is cooled and pressed.
強化熱可塑性樹脂シートの製造法において、熱可塑性樹
脂よりなる表層部用樹脂フィルム並びにこの表層部用樹
脂フィルムと同種類の熱可塑性樹脂であり且つその重量
減少開始温度が下記（１）式を満足する樹脂と強化繊維
よりなる強化繊維入り樹脂シート材を材料とし、次の工
程の順序で実施することを特徴とする繊維強化熱可塑性
樹脂シートの製造法。 （Ａ）強化繊維入り樹脂シート材の両側に表層部用の樹
脂フィルムを重ね、（Ｂ）Ａ工程で重ね合わせた積層物
を加熱し、加圧して板状体にし、（Ｃ）この板状体を冷
却すると共に加圧する 【数３】 3. A method for producing a fiber-reinforced thermoplastic resin sheet used as a material for compression molding, comprising a resin film for a surface layer portion made of a thermoplastic resin, and a thermoplastic resin of the same kind as the resin film for the surface layer portion. A fiber-reinforced thermoplastic resin characterized in that a resin sheet material containing a reinforcing fiber, which has a weight reduction start temperature satisfying the following formula (1) and a reinforcing fiber, is used as a material, and is carried out in the order of the following steps. Sheet manufacturing method. (A) A resin film for the surface layer portion is laminated on both sides of the resin sheet material containing reinforcing fibers, (B) the laminate laminated in the step A is heated and pressed into a plate-like body, and (C) this plate-like body Cool and pressurize the body [Equation 3]
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5338651A JPH07196822A (en) | 1993-12-28 | 1993-12-28 | Fiber-reinforced thermoplastic resin sheet and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5338651A JPH07196822A (en) | 1993-12-28 | 1993-12-28 | Fiber-reinforced thermoplastic resin sheet and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07196822A true JPH07196822A (en) | 1995-08-01 |
Family
ID=18320185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5338651A Pending JPH07196822A (en) | 1993-12-28 | 1993-12-28 | Fiber-reinforced thermoplastic resin sheet and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07196822A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014166702A (en) * | 2013-02-28 | 2014-09-11 | Honda Motor Co Ltd | Fiber-reinforced resin molding and molding method thereof |
| WO2015083707A1 (en) * | 2013-12-03 | 2015-06-11 | 三菱レイヨン株式会社 | Fiber-reinforced resin laminate |
| JP2017031243A (en) * | 2015-07-29 | 2017-02-09 | 日本ポリプロ株式会社 | Polyolefin resin, stampable sheet using the same in surface layer and molded product produced by molding stampable sheet |
| CN108071695A (en) * | 2016-11-16 | 2018-05-25 | 斯凯孚公司 | Bearing block, bear box or split bearing housing and its manufacturing method |
-
1993
- 1993-12-28 JP JP5338651A patent/JPH07196822A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014166702A (en) * | 2013-02-28 | 2014-09-11 | Honda Motor Co Ltd | Fiber-reinforced resin molding and molding method thereof |
| WO2015083707A1 (en) * | 2013-12-03 | 2015-06-11 | 三菱レイヨン株式会社 | Fiber-reinforced resin laminate |
| JP5900663B2 (en) * | 2013-12-03 | 2016-04-06 | 三菱レイヨン株式会社 | Fiber reinforced resin laminate |
| JP2017031243A (en) * | 2015-07-29 | 2017-02-09 | 日本ポリプロ株式会社 | Polyolefin resin, stampable sheet using the same in surface layer and molded product produced by molding stampable sheet |
| CN108071695A (en) * | 2016-11-16 | 2018-05-25 | 斯凯孚公司 | Bearing block, bear box or split bearing housing and its manufacturing method |
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