JP2011088997A - Molded product composed of composite material and production method therefor - Google Patents

Molded product composed of composite material and production method therefor Download PDF

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JP2011088997A
JP2011088997A JP2009242872A JP2009242872A JP2011088997A JP 2011088997 A JP2011088997 A JP 2011088997A JP 2009242872 A JP2009242872 A JP 2009242872A JP 2009242872 A JP2009242872 A JP 2009242872A JP 2011088997 A JP2011088997 A JP 2011088997A
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light stabilizer
composite material
pka
polypropylene
molded product
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Takayoshi Hayashi
多加良 林
Katsushi Ito
克志 伊藤
Katsutoshi Mizuno
克俊 水野
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Toyoda Gosei Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a molded product composed of a composite material of plant fibers and a synthetic resin, hardly causing color shift over many years, and to provide its production method. <P>SOLUTION: The production method for the molded product is characterized by molding a composite material containing: waste paper pulp, prepared by disintegrating waste paper; a block polypropylene; an olefinic rubber (an ethylene-butene copolymer); a basic compound of magnesium hydroxide or calcium stearate; and a hindered amine light stabilizer, by using an injection molding machine or the like after melt-kneading the composite material. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、植物繊維と合成樹脂との複合材料からなる成形体及びその製造方法に関するものである。   The present invention relates to a molded body made of a composite material of a vegetable fiber and a synthetic resin, and a method for producing the molded body.

今日、ポリプロピレンは、成形がしやすく軽量な素材であることから、さまざまな用途に使われているものの、剛性等の強度が比較的低いため、用途によっては、炭酸カルシウム等の無機充填材を添加することで強度を向上させたものが使われている。無機充填材以外にも、木材パルプ等の植物繊維を添加することで強度を向上させたものが特許文献1〜5に記載されている。また、ポリプロピレンは、石油等の化石燃料を原料にしていることから、ポリプロピレンの使用量を減らすことは有要であり、その点からも無機充填材や植物繊維を添加することは有用となっている。   Today, polypropylene is a lightweight material that is easy to mold and is used in a variety of applications, but its strength such as rigidity is relatively low, so depending on the application, inorganic fillers such as calcium carbonate may be added. What has been improved in strength by doing. In addition to the inorganic filler, Patent Documents 1 to 5 describe those whose strength is improved by adding plant fibers such as wood pulp. In addition, since polypropylene is made from fossil fuels such as petroleum, it is important to reduce the amount of polypropylene used. From this point of view, it is useful to add inorganic fillers and plant fibers. Yes.

ところが、無機充填材は密度が比較的高いことから、無機充填材を多く添加することは、ポリプロピレンの特徴である軽量性を減殺することになる。   However, since the inorganic filler has a relatively high density, adding a large amount of the inorganic filler reduces the lightness that is characteristic of polypropylene.

一方、植物繊維は、密度が比較的低いことから、多量に添加しても、軽量性というポリプロピレンの特徴は生かすことができる。しかし、植物繊維は、セルロース等からなるため、熱による影響を受けやすく、条件によってはポリプロピレンの溶融温度である約160℃ぐらいでも酸化され、カルボキシル基等の酸性基を生成するおそれがあった。   On the other hand, since plant fibers have a relatively low density, even if they are added in a large amount, the characteristics of polypropylene such as light weight can be utilized. However, since the plant fiber is made of cellulose or the like, it is easily affected by heat, and depending on conditions, the fiber may be oxidized even at about 160 ° C., which is the melting temperature of polypropylene, to generate an acidic group such as a carboxyl group.

ところで、ポリプロピレンは、耐光安定性が低く、光により変色しやすいことから、特許文献6、7記載のように、長期信頼性として経年による色ずれ(変色)が重視される自動車部品等においては、光安定剤が添加されたものが用いられている。通常、ポリプロピレンに添加される光安定剤は塩基性のものであることから、植物繊維を添加した場合には、溶融混練時等の加熱で生成した酸性基により、光安定剤の効果の発現が阻害されるため、経年による色ずれが生じ、自動車部品には用いることができなかった。また、射出成形等のように、ポリプロピレンをその溶融温度より高温(約200℃以上)に加熱することで流動しやすくして賦形する成形方法では、金型等を錆びさせることがあった。   By the way, since polypropylene has low light resistance stability and is likely to be discolored by light, as described in Patent Documents 6 and 7, in automobile parts and the like where color shift (discoloration) due to aging is important as long-term reliability, What added the light stabilizer is used. Usually, since the light stabilizer added to polypropylene is basic, when plant fibers are added, the effect of the light stabilizer is manifested by acidic groups generated by heating such as during melt kneading. Since it is obstructed, color shift due to aging occurs, and it cannot be used for automobile parts. In addition, in a molding method such as injection molding, in which a polypropylene is heated to a temperature higher than its melting temperature (about 200 ° C. or more) to make it easy to flow, a mold or the like may be rusted.

特開平5−320367号公報JP-A-5-320367 特開2004−114436号公報JP 2004-114436 A 特開昭64−51451号公報Japanese Unexamined Patent Publication No. 64-51451 特開平8−283475号公報JP-A-8-283475 特開平10−193347号公報Japanese Patent Laid-Open No. 10-193347 特開平8−239524号公報JP-A-8-239524 特開2009−167407号公報JP 2009-167407 A

そこで、本発明は、経年による色ずれが生じにくい、植物繊維と合成樹脂との複合材料からなる成形体及びその製造方法を提供することを目的とする。   Then, an object of this invention is to provide the molded object which consists of the composite material of a vegetable fiber and a synthetic resin, and its manufacturing method which are hard to produce the color shift by aging.

上記課題を解決するため、本発明の成形体の製造方法は、植物繊維、ポリプロピレン、塩基性化合物及び光安定剤を含む複合材料を溶融混練した後、成形することを特徴とする。   In order to solve the above problems, the method for producing a molded article of the present invention is characterized in that a composite material containing plant fibers, polypropylene, a basic compound and a light stabilizer is melt-kneaded and then molded.

本発明の別の成形体の製造方法は、植物繊維、ポリプロピレン及びpKaが3〜7の光安定剤を含む複合材料を溶融混練した後、成形することを特徴とする。   Another method for producing a molded article of the present invention is characterized in that a composite material containing plant fiber, polypropylene, and a light stabilizer having a pKa of 3 to 7 is melt-kneaded and then molded.

本明細書において、pKaは25℃における酸解離定数であり、酸の強さを定量的に表すための指標である。pKaが小さな物質ほど酸性が強いことを意味している。   In this specification, pKa is an acid dissociation constant at 25 ° C., and is an index for quantitatively representing the strength of the acid. This means that the substance with a smaller pKa is more acidic.

上記課題を解決するため、本発明の成形体は、上記いずれかの製造方法により作られたものである。   In order to solve the above problems, the molded article of the present invention is made by any one of the above-described production methods.

本発明における各要素の態様を以下に例示する。   The aspect of each element in the present invention is exemplified below.

1.植物繊維
植物繊維としては、特に限定はされないが、綿、麻、パルプ等が例示でき、資源の有効利用になることから、古紙を解繊した古紙パルプであることが好ましい。
植物繊維の配合量としては、特に限定はされないが、ポリプロピレンを含む合成樹脂との合計量を100質量部にした場合に、10〜30質量部であることが好ましく、より好ましくは、20〜30質量部である。10質量部未満では、用途にもよるが、十分な強度を得ることができず、30質量部を超えると溶融時の流動性が悪く、成形しにくくなる。
1. Plant fiber Although it does not specifically limit as a vegetable fiber, Cotton, hemp, a pulp etc. can be illustrated and it becomes the effective use of resources, Therefore It is preferable that it is the waste paper pulp which defibrated waste paper.
Although it does not specifically limit as a compounding quantity of a vegetable fiber, When a total amount with the synthetic resin containing a polypropylene is 100 mass parts, it is preferable that it is 10-30 mass parts, More preferably, it is 20-30. Part by mass. If it is less than 10 parts by mass, although it depends on the application, sufficient strength cannot be obtained, and if it exceeds 30 parts by mass, the fluidity at the time of melting is poor and molding becomes difficult.

2.ポリプロピレン
ポリプロピレンとしては、特に限定はされないが、ホモポリプロピレンでもよいし、ブロックポリプロピレンでもよい。また、植物繊維との密着性が向上することから、ポリプロピレンをマレイン酸等で変性した変性ポリプロピレンを含むものでもよい。
2. Polypropylene Polypropylene is not particularly limited, but may be homopolypropylene or block polypropylene. Moreover, since adhesiveness with a vegetable fiber improves, the modified polypropylene which modified | denatured polypropylene with maleic acid etc. may be included.

3.光安定剤
光安定剤としては、特に限定はされないが、ヒンダードアミン系光安定剤(HALS)であることが好ましい。
pKaが3〜7の光安定剤を用いることにより、光安定剤はその効果を発現することができ、成形体は経年による色ずれが生じにくくなる。これは、溶融混練時等の加熱により植物繊維の少なくとも一部が酸化分解されることで生じるカルボキシル基等の酸性基の影響を光安定剤が受けにくいためである。pKaが3〜5の光安定剤を用いることが好ましい。
塩基性化合物と共に用いる場合の光安定剤としては、特に限定はされないが、pKaが10以下のものであることが好ましく、より好ましくは、pKaが、共に用いられる塩基性化合物のpKaより小さいものである。さらに好ましくは、上記理由により、pKaが3〜7のものであり、それより好ましくは、pKaが3〜5のものである。
光安定剤の添加量は、効果が得られる量であれば、特に限定はされない。敢えて言うならば、ポリプロピレンを含む合成樹脂と植物繊維との合計量100質量部に対し0.05〜5質量部である。
3. Light stabilizer Although it does not specifically limit as a light stabilizer, It is preferable that it is a hindered amine light stabilizer (HALS).
By using a light stabilizer having a pKa of 3 to 7, the light stabilizer can exhibit its effect, and the molded product is less likely to cause color shift due to aging. This is because the light stabilizer is not easily affected by an acidic group such as a carboxyl group that is generated when at least a part of the plant fiber is oxidatively decomposed by heating during melt kneading. It is preferable to use a light stabilizer having a pKa of 3 to 5.
The light stabilizer used together with the basic compound is not particularly limited, but preferably has a pKa of 10 or less, more preferably a pKa smaller than that of the basic compound used together. is there. More preferably, for the above reasons, the pKa is 3-7, and more preferably, the pKa is 3-5.
The addition amount of the light stabilizer is not particularly limited as long as the effect is obtained. If it dares to say, it is 0.05-5 mass parts with respect to 100 mass parts of total amounts of the synthetic resin and vegetable fiber containing a polypropylene.

4.塩基性化合物
塩基性化合物を加えることにより、光安定剤はその効果を発現することができ、成形体は経年による色ずれが生じにくくなる。これは、溶融混練時等の加熱により植物繊維の少なくとも一部が酸化分解されることで生じるカルボキシル基等の酸性基の影響を塩基性化合物が緩和するためである。
塩基性化合物としては、特に限定はされないが、pKaが8以上のものであることが好ましく、より好ましいのは、pKaが、共に用いられる光安定剤のpKaより大きいものである。また、pKaの上限の塩基性化合物としては、特に限定はされないが、14以下のものであることが好ましい。
また、塩基性化合物としては、塩基性無機充填剤、金属石鹸等が例示できる。
塩基性無機充填剤としては、水酸化マグネシウム(pKa:11.4)、炭酸カルシウム(pKa:10.33)等が例示できる。
金属石鹸としては、ステアリン酸カルシウム(pKa:8.8)、ステアリン酸マグネシウム(pKa:8.57)等が例示できる。
塩基性化合物の添加量は、効果が得られる量であれば、特に限定はされない。敢えて言うならば、ポリプロピレンを含む合成樹脂と植物繊維との合計量100質量部に対し0.1〜15質量部である。
4). Basic Compound By adding a basic compound, the light stabilizer can exhibit its effect, and the molded product is less likely to cause color shift due to aging. This is because the basic compound relieves the influence of acidic groups such as carboxyl groups that are generated when at least a part of the plant fiber is oxidatively decomposed by heating during melt kneading.
Although it does not specifically limit as a basic compound, It is preferable that pKa is 8 or more, More preferably, pKa is larger than pKa of the light stabilizer used together. The basic compound at the upper limit of pKa is not particularly limited, but is preferably 14 or less.
Examples of the basic compound include basic inorganic fillers and metal soaps.
Examples of the basic inorganic filler include magnesium hydroxide (pKa: 10.14), calcium carbonate (pKa: 10.33) and the like.
Examples of the metal soap include calcium stearate (pKa: 8.8) and magnesium stearate (pKa: 8.57).
The addition amount of the basic compound is not particularly limited as long as the effect is obtained. If it dares to say, it will be 0.1-15 mass parts with respect to 100 mass parts of total amounts of the synthetic resin and vegetable fiber containing a polypropylene.

5.複合材料
複合材料としては、特に限定はされないが、成形体の物性を向上させるため、ポリプロピレン以外の合成樹脂を含んでいてもよいし、含んでいなくてもよい。また、加工性、意匠性、耐候性等の特性を向上させるため、可塑剤、顔料、着色剤、酸化防止剤等が添加されていてもよいし、添加されていなくてもよい。
ここで、ポリプロピレン以外の合成樹脂としては、特に限定はされないが、耐衝撃性等が向上することから、エチレン−プロピレン共重合体(EPM)、エチレン−プロピレン−ジエン共重合体(EPDM)、エチレン−ブテン共重合体(EBM)、エチレン−オクテン共重合体(EOM)等のオレフィン系ゴムが例示できる。
5). Composite material Although it does not specifically limit as a composite material, In order to improve the physical property of a molded object, synthetic resins other than a polypropylene may be included and it does not need to be included. Moreover, in order to improve characteristics such as processability, designability, and weather resistance, a plasticizer, a pigment, a colorant, an antioxidant, and the like may be added, or may not be added.
Here, the synthetic resin other than polypropylene is not particularly limited, but since impact resistance and the like are improved, ethylene-propylene copolymer (EPM), ethylene-propylene-diene copolymer (EPDM), ethylene Examples thereof include olefin rubbers such as a butene copolymer (EBM) and an ethylene-octene copolymer (EOM).

6.成形方法
成形体の成形方法としては、特に限定はされないが、溶融混練と成形とが連続して行える、射出成形、押出成形等が例示できる。
6). Molding Method The molding method of the molded body is not particularly limited, and examples thereof include injection molding and extrusion molding in which melt kneading and molding can be performed continuously.

7.成形体
成形体の用途としては、特に限定はされないが、塗装等による着色が施されていないものが好ましく、具体的には、ドアトリム、ピラーガーニッシュ、スカフプレート等の自動車の内装品や、家電製品等の筐体や、文具等の日用品等が例示できる。
7). Molded body The usage of the molded body is not particularly limited, but is preferably not colored by painting or the like, and specifically, interior parts of automobiles such as door trims, pillar garnishes, scuff plates, and home appliances. Cases such as products and daily necessaries such as stationery can be exemplified.

本発明によれば、経年による色ずれが生じにくい、植物繊維と合成樹脂との複合材料からなる成形体を製造し、提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the molded object which consists of a composite material of a vegetable fiber and a synthetic resin which cannot produce the color shift by aged can be manufactured and provided.

本発明の実施例として、表1に配合を示す6種類の成形体を製造した。塩基性化合物(水酸化マグネシウム又はステアリン酸カルシウム)を加えない実施例(1、2)は、pKaが4.0〜7.0の光安定剤を用い、塩基性化合物を加えた実施例(3〜6)は、pKaが4.0〜9.0の光安定剤を用いた。
比較例として、表1に配合を示す2種類の成形体を製造した。また、それぞれの成形体について、耐光安定性試験を行い、その測定値を表1に示す。
As examples of the present invention, six types of molded products whose formulations are shown in Table 1 were produced. Examples (1, 2) in which a basic compound (magnesium hydroxide or calcium stearate) is not added are examples in which a basic compound is added using a light stabilizer having a pKa of 4.0 to 7.0. 6) used a light stabilizer having a pKa of 4.0 to 9.0.
As comparative examples, two types of molded products whose compositions are shown in Table 1 were produced. Further, each molded body was subjected to a light stability test, and the measured values are shown in Table 1.

Figure 2011088997
Figure 2011088997

本実施例及び比較例には、次のものを原料として用いた。
ポリプロピレンとしては、ブロックポリプロピレンを用いた。
植物繊維としては、古紙を解繊した古紙パルプを用いた。
オレフィン系ゴムとしては、エチレン−ブテン共重合体を用いた。
In the examples and comparative examples, the following were used as raw materials.
As polypropylene, block polypropylene was used.
As the plant fiber, used paper pulp obtained by defibrating used paper was used.
An ethylene-butene copolymer was used as the olefin rubber.

光安定剤としては、pKa(酸解離定数)が異なる(pKa:4.0〜9.0)三種類のヒンダードアミン系光安定剤を用いた。   As the light stabilizer, three kinds of hindered amine light stabilizers having different pKa (acid dissociation constant) (pKa: 4.0 to 9.0) were used.

光安定剤1は、pKaが9.0であり、その化学構造式を次に示す。なお、Rは有機基である。

Figure 2011088997
The light stabilizer 1 has a pKa of 9.0, and its chemical structural formula is shown below. R is an organic group.
Figure 2011088997

光安定剤2は、pKaが7.0であり、その化学構造式を次に示す。なお、Rは有機基である。

Figure 2011088997
The light stabilizer 2 has a pKa of 7.0, and the chemical structural formula thereof is shown below. R is an organic group.
Figure 2011088997

光安定剤3は、pKaが4.0であり、その化学構造式を次に示す。なお、Rは有機基であり、Rはアルキル基である。

Figure 2011088997
The light stabilizer 3 has a pKa of 4.0, and its chemical structural formula is shown below. R 1 is an organic group and R 2 is an alkyl group.
Figure 2011088997

水酸化マグネシウムは、粒子径が1.5μm〜10μmのものを用いた。
ステアリン酸カルシウムは、粒子径が1.5μm〜12μmのものを用いた。
Magnesium hydroxide having a particle size of 1.5 μm to 10 μm was used.
Calcium stearate having a particle size of 1.5 μm to 12 μm was used.

次に各実施例について説明する。
実施例1は、ポリプロピレン65質量部、植物繊維25質量部及びオレフィン系ゴム10質量部に、光安定剤として光安定剤2を0.5質量部加えたものを押出機を用いて溶融混練した後、射出成形機により成形した。
実施例2は、光安定剤を光安定剤3に変更した以外は、実施例1と同様に行った。
実施例3は、光安定剤を光安定剤1に変更すると共に、ステアリン酸カルシウムを3.0質量部加えた以外は、実施例1と同様に行った。
実施例4は、光安定剤を光安定剤1に変更すると共に、水酸化マグネシウムを3.0質量部加えた以外は、実施例1と同様に行った。
実施例5は、水酸化マグネシウムを3.0質量部加えた以外は、実施例1と同様に行った。
実施例6は、光安定剤を光安定剤3に変更すると共に、水酸化マグネシウムを3.0質量部加えた以外は、実施例1と同様に行った。
Next, each example will be described.
In Example 1, 65 parts by mass of polypropylene, 25 parts by mass of plant fibers, and 10 parts by mass of olefin rubber were added with 0.5 parts by mass of light stabilizer 2 as a light stabilizer, and were melt-kneaded using an extruder. Thereafter, it was molded by an injection molding machine.
Example 2 was carried out in the same manner as Example 1 except that the light stabilizer was changed to the light stabilizer 3.
Example 3 was carried out in the same manner as Example 1 except that the light stabilizer was changed to light stabilizer 1 and 3.0 parts by mass of calcium stearate was added.
Example 4 was carried out in the same manner as Example 1 except that the light stabilizer was changed to light stabilizer 1 and 3.0 parts by mass of magnesium hydroxide was added.
Example 5 was carried out in the same manner as Example 1 except that 3.0 parts by mass of magnesium hydroxide was added.
Example 6 was performed in the same manner as Example 1 except that the light stabilizer was changed to the light stabilizer 3 and 3.0 parts by mass of magnesium hydroxide was added.

次に各比較例について説明する。
比較例1は、光安定剤を加えなかった以外は、実施例1と同様に行った。
比較例2は、光安定剤を光安定剤1に変更した以外は、実施例1と同様に行った。
Next, each comparative example will be described.
Comparative Example 1 was performed in the same manner as Example 1 except that no light stabilizer was added.
Comparative Example 2 was performed in the same manner as in Example 1 except that the light stabilizer was changed to the light stabilizer 1.

耐光安定性試験
耐光安定性試験は、上記のようにして作成して試料(試験片)を用い、JIS K 7102(着色プラスチック材料のカーボンアーク燈光に対する色堅ろう度試験方法)に準拠し、照射時間1000時間で行った。
そして、試験前後の試料の色彩(Lab色度)を色差計を用いて測定し、試験前後のLab色度の値から下記の式を用いて、試験の前後におけるLab色度変化(ΔE)を求めた。

Figure 2011088997

、a、bは、試験後のLab色度の値であり、L、a、bは、試験前のLab色度の値である。 Light Stability Test The light stability test was prepared as described above, using a sample (test piece), and conforming to JIS K7102 (color fastness test method for carbon arc fluorescence of colored plastic material), irradiation time It took 1000 hours.
Then, the color (Lab chromaticity) of the sample before and after the test was measured using a color difference meter, and the Lab chromaticity change (ΔE) before and after the test was calculated from the Lab chromaticity value before and after the test using the following formula. Asked.
Figure 2011088997

L a , a a , and b a are Lab chromaticity values after the test, and L b , a b , and bb are Lab chromaticity values before the test.

表1に示すように、本実施例は全て、耐光安定性試験によるLab色度変化が2.9以下であった。詳細を次に示す。
・光安定剤にpKaが4.0〜7.0のヒンダードアミン系光安定剤を用いた実施例1、2、5、6は、Lab色度変化が2.5以下であった。
・光安定剤にpKaが4.0のヒンダードアミン系光安定剤を用いた実施例2、6は、Lab色度変化が2.0以下であった。
・塩基性化合物にpKaが8.8のステアリン酸カルシウム又はpKaが11.4の水酸化マグネシウムを用い、光安定剤にpKaが4.0〜9.0のヒンダードアミン系光安定剤を用いた実施例3〜6は、Lab色度変化が2.9以下であった。
・塩基性化合物にpKaが11.4の水酸化マグネシウムを用い、光安定剤にpKaが4.0〜9.0のヒンダードアミン系光安定剤を用いた実施例4〜6は、Lab色度変化が2.3以下であった。
・塩基性化合物にpKaが11.4の水酸化マグネシウムを用い、光安定剤にpKaが4.0〜7.0のヒンダードアミン系光安定剤を用いた実施例5、6は、Lab色度変化が2.0以下であった。
・塩基性化合物にpKaが11.4の水酸化マグネシウムを用い、光安定剤にpKaが4.0のヒンダードアミン系光安定剤を用いた実施例6は、Lab色度変化が1.9であった。
以上より、実施例のLab色度変化は、比較例のLab色度変化(3.9以上)より小さいことから、経時による色ずれが生じにくい成形体を得ることができた。
As shown in Table 1, in all of Examples, the change in Lab chromaticity by the light resistance stability test was 2.9 or less. Details are as follows.
In Examples 1, 2, 5, and 6 where a hindered amine light stabilizer having a pKa of 4.0 to 7.0 was used as the light stabilizer, the change in Lab chromaticity was 2.5 or less.
In Examples 2 and 6 using a hindered amine light stabilizer having a pKa of 4.0 as the light stabilizer, the Lab chromaticity change was 2.0 or less.
Example in which calcium stearate having a pKa of 8.8 or magnesium hydroxide having a pKa of 11.4 is used as the basic compound, and a hindered amine light stabilizer having a pKa of 4.0 to 9.0 is used as the light stabilizer. 3 to 6 had a Lab chromaticity change of 2.9 or less.
Examples 4 to 6 in which magnesium hydroxide having a pKa of 11.4 was used as the basic compound and a hindered amine light stabilizer having a pKa of 4.0 to 9.0 was used as the light stabilizer, the Lab chromaticity change Was 2.3 or less.
Examples 5 and 6 in which magnesium hydroxide having a pKa of 11.4 was used as the basic compound and a hindered amine light stabilizer having a pKa of 4.0 to 7.0 was used as the light stabilizer, the Lab chromaticity change Was 2.0 or less.
In Example 6 in which magnesium hydroxide having a pKa of 11.4 was used as the basic compound and a hindered amine light stabilizer having a pKa of 4.0 was used as the light stabilizer, the Lab chromaticity change was 1.9. It was.
From the above, since the Lab chromaticity change of the example is smaller than the Lab chromaticity change (3.9 or more) of the comparative example, it was possible to obtain a molded body in which color shift with time does not easily occur.

なお、本発明は前記実施例に限定されるものではなく、発明の趣旨から逸脱しない範囲で適宜変更して具体化することもできる。   In addition, this invention is not limited to the said Example, In the range which does not deviate from the meaning of invention, it can change suitably and can be actualized.

Claims (4)

植物繊維、ポリプロピレン、塩基性化合物及び光安定剤を含む複合材料を溶融混練した後、成形することを特徴とする成形体の製造方法。   A method for producing a molded body, comprising melting and kneading a composite material containing plant fiber, polypropylene, a basic compound and a light stabilizer, and then molding the composite material. 前記光安定剤は、pKaが前記塩基性化合物のpKaより小さいものである請求項1記載の成形体の製造方法。   The method for producing a molded article according to claim 1, wherein the light stabilizer has a pKa smaller than that of the basic compound. 植物繊維、ポリプロピレン及びpKaが3〜7の光安定剤を含む複合材料を溶融混練した後、成形することを特徴とする成形体の製造方法。   A method for producing a molded article, comprising melting and kneading a composite material containing a plant fiber, polypropylene, and a light stabilizer having a pKa of 3 to 7, and then molding. 請求項1〜3のいずれか一項に記載の製造方法により製造された成形体。   The molded object manufactured by the manufacturing method as described in any one of Claims 1-3.
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WO2013121915A1 (en) * 2012-02-13 2013-08-22 株式会社小糸製作所 Vehicle light
JP2013165022A (en) * 2012-02-13 2013-08-22 Koito Mfg Co Ltd Vehicle lamp
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JPWO2013187257A1 (en) * 2012-06-15 2016-02-04 株式会社小糸製作所 Vehicle lighting
WO2014017274A1 (en) 2012-07-24 2014-01-30 出光ライオンコンポジット株式会社 Vehicle lamp
US9366408B2 (en) 2012-07-24 2016-06-14 Lion Idemitsu Composites Co., Ltd. Vehicle lamp having plant fiber
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