JPH0449576B2 - - Google Patents
Info
- Publication number
- JPH0449576B2 JPH0449576B2 JP59155551A JP15555184A JPH0449576B2 JP H0449576 B2 JPH0449576 B2 JP H0449576B2 JP 59155551 A JP59155551 A JP 59155551A JP 15555184 A JP15555184 A JP 15555184A JP H0449576 B2 JPH0449576 B2 JP H0449576B2
- Authority
- JP
- Japan
- Prior art keywords
- polypropylene
- weight
- warpage
- organic peroxide
- injection molding
- 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.)
- Expired - Lifetime
Links
- -1 polypropylene Polymers 0.000 claims description 49
- 239000004743 Polypropylene Substances 0.000 claims description 42
- 229920001155 polypropylene Polymers 0.000 claims description 42
- 239000000203 mixture Substances 0.000 claims description 17
- 150000001451 organic peroxides Chemical class 0.000 claims description 17
- 238000001746 injection moulding Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 18
- 239000003484 crystal nucleating agent Substances 0.000 description 12
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 229960002920 sorbitol Drugs 0.000 description 7
- 239000000600 sorbitol Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 230000002265 prevention Effects 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 5
- 239000005977 Ethylene Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000002667 nucleating agent Substances 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 229920001400 block copolymer Polymers 0.000 description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- RFFLAFLAYFXFSW-UHFFFAOYSA-N 1,2-dichlorobenzene Chemical compound ClC1=CC=CC=C1Cl RFFLAFLAYFXFSW-UHFFFAOYSA-N 0.000 description 2
- UBRWPVTUQDJKCC-UHFFFAOYSA-N 1,3-bis(2-tert-butylperoxypropan-2-yl)benzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC(C(C)(C)OOC(C)(C)C)=C1 UBRWPVTUQDJKCC-UHFFFAOYSA-N 0.000 description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- ZQMIGQNCOMNODD-UHFFFAOYSA-N diacetyl peroxide Chemical compound CC(=O)OOC(C)=O ZQMIGQNCOMNODD-UHFFFAOYSA-N 0.000 description 2
- QEQBMZQFDDDTPN-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy benzenecarboperoxoate Chemical compound CC(C)(C)OOOC(=O)C1=CC=CC=C1 QEQBMZQFDDDTPN-UHFFFAOYSA-N 0.000 description 1
- KDGNCLDCOVTOCS-UHFFFAOYSA-N (2-methylpropan-2-yl)oxy propan-2-yl carbonate Chemical compound CC(C)OC(=O)OOC(C)(C)C KDGNCLDCOVTOCS-UHFFFAOYSA-N 0.000 description 1
- YZGJLGUCTISYPI-UHFFFAOYSA-N 1,3-bis(2-butylperoxypropan-2-yl)benzene Chemical compound CCCCOOC(C)(C)C1=CC=CC(C(C)(C)OOCCCC)=C1 YZGJLGUCTISYPI-UHFFFAOYSA-N 0.000 description 1
- NOSXUFXBUISMPR-UHFFFAOYSA-N 1-tert-butylperoxyhexane Chemical compound CCCCCCOOC(C)(C)C NOSXUFXBUISMPR-UHFFFAOYSA-N 0.000 description 1
- WFUGQJXVXHBTEM-UHFFFAOYSA-N 2-hydroperoxy-2-(2-hydroperoxybutan-2-ylperoxy)butane Chemical compound CCC(C)(OO)OOC(C)(CC)OO WFUGQJXVXHBTEM-UHFFFAOYSA-N 0.000 description 1
- TVWBTVJBDFTVOW-UHFFFAOYSA-N 2-methyl-1-(2-methylpropylperoxy)propane Chemical compound CC(C)COOCC(C)C TVWBTVJBDFTVOW-UHFFFAOYSA-N 0.000 description 1
- NFPBWZOKGZKYRE-UHFFFAOYSA-N 2-propan-2-ylperoxypropane Chemical compound CC(C)OOC(C)C NFPBWZOKGZKYRE-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000012933 diacyl peroxide Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920005676 ethylene-propylene block copolymer Polymers 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 150000002432 hydroperoxides Chemical class 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 150000004978 peroxycarbonates Chemical class 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- SWAXTRYEYUTSAP-UHFFFAOYSA-N tert-butyl ethaneperoxoate Chemical compound CC(=O)OOC(C)(C)C SWAXTRYEYUTSAP-UHFFFAOYSA-N 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
〔産業上の利用分野〕
本発明は、射出成形による、成形体の新規な製
造方法に関する。詳しくは、得られる成形体のそ
りを著しく改善することが可能な成形体の製造方
法である。
〔従来の技術及び問題点〕
ポリプロピレンを射出成形して、板状体のよう
な肉厚が比較的薄い成形体を得る場合において、
成形体を金型から取り出すと、該成形体の内部応
力の緩和、または収縮のためにそりが発生する。
従来、上記成形体のそりを防止する技術として
射出成形において、金型の冷却時間を長くする
方法、金型から取り出した成形体を治具に固定
し、そりを強制的に矯正する方法、あるいは分
子量の小さいポリプロピレンを用いる方法が提案
されている。しかしながら、これらの方法は、あ
る程度のそり防止効果が得られるものの、の方
法については、冷却時間の延長による生産性の低
下が著しく、の方法については、治具を用いる
ことによる工程の増加により生産性が著しく低下
するばかりでなく、複雑な構造の成形体に適用す
ることが困難である。また、の方法について
は、成形体によりそり防止効果の度合いが変化
し、安定したそり防止効果が期待できない。
従つて成形条件に影響を受けず、そりを防止し
得るポリプロピレンの射出成形方法の開発は、従
来からの大きな課題とされていた。
〔問題点を解決するための手段〕
本発明者等は、上記課題を達成すべく鋭意研究
重ねた結果、ポリプロピレンを特定量の有機過酸
化物の存在下に熱分解して得られる分解ポリプロ
ピレンに対し、特定量のソルビトールの誘導体よ
りなる結晶核剤を配合してなる分解ポリプロピレ
ン組成物を射出成形することにより、得られる成
形体のそりが著しく改善されることを見い出し、
本発明を完成するに至つた。
即ち、本発明は、ポリプロピレン及び該ポリプ
ロピレンに対して有機過酸化物0.001〜１重量％
よりなる混合物を、該ポリプロピレンの融点以上
で且つ該有機過酸化物の温度以上、300℃以下の
温度で加熱処理して得られるｗ／ｎ比が５以
下の分解ポリプロピレン100重量部に対して、ソ
ルビトールの誘導体よりなる結晶核剤を0.05〜１
重量部の割合で配合してなる分解ポリプロピレン
組成物を射出成形することを特徴とする成形体の
製造方法である。
本発明において使用するポリプロピレンはプロ
ピレンの単独重合体、プロピレンとエチレン、ブ
テン−１等のプロピレン以外のα−オレフインと
のブロツク共重体、ランダム共重合体、グラフト
共重合体等の共重合体を総称するものである。
本発明において、有機過酸化物は、公知のもの
が特に制限なく使用される。例えば、メチルエチ
ルケトンパーオキサイド、メチルイソブチルケト
ンパーオキサイド等のケトンパーオキサイド：イ
ソブチルパーオキサイドアセチルパーオキサイド
等のジアシルパーオキサイド；ジイソプロピルパ
ーオキサイド、その他のハイドロパーオキサイ
ド；２，５−ジメチル２，５−ジ−（ｔ−ブチル
パーオキシ）ヘキサン、１，３−ビス−（ｔ−ブ
チルパーオキシイソプロピル）ベンゼン等のジア
ルキルパーオキサイド；１，１−ジ−ｔ−ブチル
パーオキシ−シクロヘキサン、その他のパーオキ
シケタール；ｔ−ブチルパーオキシアセテート、
ｔ−ブチルパーオキシベンゾエート等のアルキル
パーエステル；ｔ−ブチルパーオキシイソプロピ
ルカーボネート、その他のパーオキシカーボネー
ト等が挙げられる。前記有機過酸化物の使用量
は、ポリプロピレンに対して、0.001〜1.0重量
％、好ましくは、0.01〜0.5重量％が一般的であ
る。
また、本発明の加熱処理において、ポリプロピ
レンと有機過酸化物との混合は、ポリプロピレン
を加熱処理する際に有機過酸化物が存在していれ
ば、その混合方法は特に制限されない。例えば、
ブレンダー等の混合機を用いて機械的に混合する
方法、有機過酸化物を適当な溶剤に溶解させてポ
リプロピレンに付着させ、該溶剤を乾燥すること
によつて混合する方法等がある。また加熱処理温
度は、ポリプロピレンの溶融温度以上で且つ有機
過酸化物の分解温度以上の温度が採用される。し
かし、あまり加熱処理温度が高いとポリプロピレ
ンの熱劣化を招く。一般に、該加熱処理温度は、
170〜300℃、特に180〜260℃の範囲内に設定する
ことが好ましい。
本発明において、上記加熱処理は、得られる分
解ポリプロピレンのｗ／ｎ（重量平均分子
量／数平均分子量）比が５以下となるように行う
ことが好ましい。また、分解ポリプロピレンのメ
ルトフローインデツクス（以下、MIという）は．
0.5〜100ｇ／10分、好ましくは４〜30ｇ／10分程
度が適当である。
また、本発明において、結晶核剤はソルビトー
ル誘導体よりなる結晶核剤が制限なく使用され
る。例えば、１，３，２，４−ジベンジリデン−
Ｄ−ソルビトール、１，３，２，４−（ジメチル
ベンジリデン）ソルビトール、１，３，２，４−
ジ（エチルベイジリデン）ソルヒトール等のソル
ビトール誘導体が挙げられる。
本発明において、分解ポリプロピレン組成物
は、前記加熱処理により得られたポリプロピレン
100重量部に対して、結晶核剤を0.05〜１重量部、
好ましくは0.1〜0.5重量部の割合で含有する。結
晶核剤の割合が上記範囲より少ない場合には、そ
り防止効果が充分でなく、本発明の目的を達成す
ることができない。また、結晶核剤の割合が前記
範囲より多くても、そり防止効果は該範囲内の効
果と変わらず、経済的に不利であるばかりでなく
機械的性質、及び加工性にも影響を及ぼす。
ポリプロピレンと結晶核剤との混合は公知の方
法によつて行うことができる。一般にはタンブラ
ー、ヘンシエルミキサー等の混合機で行えばよ
い。また、ポリプロピレンとして、熱分解によつ
て分子量分布を調整されたものを使用する場合、
結晶核剤の添加は、分解前に行つてもよいし、分
解後に行つてもよい。
本発明において、分解ポリプロピレン組成物の
射出成形条件は、射出圧力、射出温度、金型の冷
却時間等について、公知の条件を特に制限なく採
用できる。
〔効果及び作用〕
本発明の成形方法は、射出成形条件に影響を受
けることなく、得られる成形体のそりを極めて効
果的に防止し得るものであり、そりの発生を防止
するために、従来より行なわれていた複雑且つ時
間のかかる成形方法を一挙に改善することがで
き、産業上の貢献度も極めて高いものである。
本発明の成形方法により、得られる成形体の優
れたそり防止効果を発揮し得る機構は明らかでは
ないが、本発明者等は、加熱処理によつて得られ
た分解ポリプロピレンにソルビトールの誘導体よ
りなる結晶核剤が何らかの作用をし、射出成形に
より得られる成形体のコア層とスキン層との配向
係数がほぼ等しくなることによるものと推定して
いる。
〔実施例〕
以下、本発明を具体的に説明するため、実施例
示すが、本発明はこれらの実施例に限定されるも
のではない。
尚、以下の実施例及び比端例で示す種々の性状
の測定方法は次の方法によつた。
(1) MI
ASTM Ｄ−1238により測定
(2) エチレン含有量
ブロツク共重合対のエチレン含有量は赤外吸
収のスペクトル分析によつた。
(3) 分子量分布ｗ／ｎ
測定装置はウオーターズ社製GPC 150C（商
品名）を用い、溶媒はＯ−ジクロルベンゼンを
用い、測定温度135℃で測定した。
実施例 １
MIO.2のポリプロピレン100重量部に、結晶核
剤として１，３，２，４−ジ（メチルベイジリデ
ン）及び有機過酸化物として１，３−ビス−（ｔ
−ブチルパーオキシイソプロピル）ベンゼンを所
定の割合で混合し、押出し機で樹脂温度260℃で
混練してペレツト化した。この分解ポリプロピレ
ン組成物を用いて樹脂温度230℃、射出圧力500
Kg／cm2、金型温度40℃で射出成形し、下記の形状
の円板を作成した。尚、金型冷却時間は30秒で行
つた。
円板形状 直径15cm×厚さ２mm
上記円板を中心部にて水平に回転軸に固定し、
外周部の同心円上を、抵抗線ひずみ計を応用した
変位測定器で、基準点からの振れを全周にわたつ
て測定した。そして、その振れの最大値と最小値
の差を円板直径（15cm）で割つた値を百分率で表
示し、それをそりの値とした。
組成物の添加剤配合量及びMI、分子量分布、
そりの測定結果を第１表に示す。
[Industrial Field of Application] The present invention relates to a novel method for producing a molded article by injection molding. Specifically, the present invention is a method for producing a molded article that can significantly improve the warpage of the resulting molded article. [Prior art and problems] When injection molding polypropylene to obtain a molded body with relatively thin wall thickness, such as a plate-shaped body,
When the molded body is taken out from the mold, warpage occurs due to relaxation of internal stress or shrinkage of the molded body. Conventionally, in injection molding, techniques for preventing warpage of the above-mentioned molded products include a method of increasing the cooling time of the mold, a method of fixing the molded product taken out from the mold to a jig and forcibly correcting the warpage, or A method using polypropylene with a low molecular weight has been proposed. However, although these methods can achieve a certain degree of warpage prevention effect, method (2) significantly reduces productivity due to prolonged cooling time, and method (2) significantly reduces productivity due to increased steps due to the use of jigs. Not only does this significantly reduce properties, but it is also difficult to apply to molded articles with complex structures. Furthermore, with the method (2), the degree of warpage prevention effect varies depending on the molded product, and a stable warpage prevention effect cannot be expected. Therefore, the development of a polypropylene injection molding method that is not affected by molding conditions and can prevent warping has been a major challenge for a long time. [Means for Solving the Problems] As a result of extensive research to achieve the above-mentioned problems, the present inventors have developed decomposed polypropylene obtained by thermally decomposing polypropylene in the presence of a specific amount of organic peroxide. On the other hand, they have discovered that by injection molding a decomposed polypropylene composition containing a specific amount of a crystal nucleating agent made of a sorbitol derivative, the warpage of the resulting molded product is significantly improved.
The present invention has now been completed. That is, the present invention provides polypropylene and organic peroxide in an amount of 0.001 to 1% by weight based on the polypropylene.
For 100 parts by weight of decomposed polypropylene having a w/n ratio of 5 or less obtained by heat-treating a mixture consisting of the following at a temperature above the melting point of the polypropylene and above the temperature of the organic peroxide and below 300°C, Crystal nucleating agent consisting of a sorbitol derivative from 0.05 to 1
This is a method for producing a molded article, which comprises injection molding a decomposed polypropylene composition blended in proportions of parts by weight. Polypropylene used in the present invention is a general term for propylene homopolymers, block copolymers of propylene and α-olefins other than propylene such as ethylene and butene-1, random copolymers, graft copolymers, etc. It is something to do. In the present invention, known organic peroxides can be used without particular limitation. For example, ketone peroxides such as methyl ethyl ketone peroxide and methyl isobutyl ketone peroxide; diacyl peroxides such as isobutyl peroxide; acetyl peroxide; diisopropyl peroxide and other hydroperoxides; 2,5-dimethyl 2,5-di- Dialkyl peroxides such as (t-butylperoxy)hexane and 1,3-bis-(t-butylperoxyisopropyl)benzene; 1,1-di-t-butylperoxy-cyclohexane and other peroxyketals; t-butyl peroxyacetate,
Examples include alkyl peresters such as t-butylperoxybenzoate; t-butylperoxyisopropyl carbonate and other peroxycarbonates. The amount of the organic peroxide used is generally 0.001 to 1.0% by weight, preferably 0.01 to 0.5% by weight, based on polypropylene. Further, in the heat treatment of the present invention, the mixing method of polypropylene and the organic peroxide is not particularly limited as long as the organic peroxide is present when the polypropylene is heat treated. for example,
There are a method of mechanical mixing using a mixer such as a blender, and a method of mixing by dissolving the organic peroxide in a suitable solvent, adhering it to polypropylene, and drying the solvent. Further, the heat treatment temperature is a temperature higher than the melting temperature of polypropylene and higher than the decomposition temperature of the organic peroxide. However, if the heat treatment temperature is too high, thermal deterioration of polypropylene will occur. Generally, the heat treatment temperature is
It is preferable to set the temperature within the range of 170 to 300°C, particularly 180 to 260°C. In the present invention, the heat treatment is preferably performed such that the w/n (weight average molecular weight/number average molecular weight) ratio of the resulting decomposed polypropylene is 5 or less. In addition, the melt flow index (hereinafter referred to as MI) of decomposed polypropylene is.
A suitable rate is 0.5 to 100 g/10 minutes, preferably about 4 to 30 g/10 minutes. Further, in the present invention, a crystal nucleating agent made of a sorbitol derivative can be used without any limitation. For example, 1,3,2,4-dibenzylidene-
D-Sorbitol, 1,3,2,4-(dimethylbenzylidene)sorbitol, 1,3,2,4-
Examples include sorbitol derivatives such as di(ethylbeizylidene) sorbitol. In the present invention, the decomposed polypropylene composition is the polypropylene obtained by the heat treatment.
0.05 to 1 part by weight of crystal nucleating agent per 100 parts by weight,
It is preferably contained in a proportion of 0.1 to 0.5 parts by weight. If the proportion of the crystal nucleating agent is less than the above range, the warpage prevention effect will not be sufficient and the object of the present invention will not be achieved. Furthermore, even if the proportion of the crystal nucleating agent is greater than the above range, the warpage prevention effect is the same as that within the above range, which is not only economically disadvantageous but also affects mechanical properties and workability. Mixing of polypropylene and a crystal nucleating agent can be performed by a known method. Generally, it may be carried out using a mixer such as a tumbler or a Henschel mixer. In addition, when using polypropylene whose molecular weight distribution has been adjusted by thermal decomposition,
The crystal nucleating agent may be added before or after decomposition. In the present invention, the injection molding conditions for the decomposed polypropylene composition may be any known conditions such as injection pressure, injection temperature, mold cooling time, etc., without particular limitation. [Effects and Actions] The molding method of the present invention can extremely effectively prevent warping of the obtained molded product without being affected by injection molding conditions. The complicated and time-consuming molding methods that were previously used can be improved all at once, and the degree of contribution to industry is also extremely high. Although the mechanism by which the molded product obtained by the molding method of the present invention exhibits an excellent warpage prevention effect is not clear, the present inventors have developed a method for producing decomposed polypropylene obtained by heat treatment using a sorbitol derivative. It is presumed that this is because the crystal nucleating agent has some effect and the orientation coefficients of the core layer and skin layer of the molded article obtained by injection molding become approximately equal. [Examples] Examples are shown below to specifically explain the present invention, but the present invention is not limited to these Examples. The following methods were used to measure various properties shown in the Examples and Comparative Examples below. (1) Measured according to MI ASTM D-1238 (2) Ethylene content The ethylene content of the block copolymer was determined by infrared absorption spectrum analysis. (3) Molecular weight distribution w/n The measuring device was GPC 150C (trade name) manufactured by Waters Inc., the solvent was O-dichlorobenzene, and the measurement temperature was 135°C. Example 1 1,3,2,4-di(methylbaylidene) as a crystal nucleating agent and 1,3-bis-(t) as an organic peroxide were added to 100 parts by weight of MIO.2 polypropylene.
-butylperoxyisopropyl)benzene were mixed in a predetermined ratio and kneaded using an extruder at a resin temperature of 260°C to form pellets. Using this decomposed polypropylene composition, the resin temperature was 230℃ and the injection pressure was 500℃.
Kg/cm 2 and injection molding at a mold temperature of 40°C to produce a disc having the shape shown below. The mold cooling time was 30 seconds. Disc shape: diameter 15cm x thickness 2mm The above disc is fixed horizontally to the rotating shaft at the center,
The deflection from the reference point was measured all around the concentric circle around the outer circumference using a displacement measuring device using a resistance wire strain gauge. Then, the difference between the maximum value and the minimum value of the runout was divided by the disk diameter (15 cm), and the value was expressed as a percentage, and this was taken as the warpage value. Additive content and MI of the composition, molecular weight distribution,
The warpage measurement results are shown in Table 1.
【表】
＊ No.１は比較データである。
比較例 １
MI9.2の市販のポリプロピレン100重量部に、
核剤として１，３，２，４−ジ（メチルベイジリ
デン）ソルビトールのみを加え、有機過酸化物を
添加しない場合の配合量及びこのポリプロピレン
組成物を用いて射出成形した場合の得られる成形
体のそり測定結果を第２表に示す。尚、円板の射
出成形方法及びそりの測定方法は実施例１と同様
にした。[Table] * No. 1 is comparative data.
Comparative Example 1 100 parts by weight of commercially available polypropylene of MI9.2,
Blend amount when only 1,3,2,4-di(methylbaisylidene)sorbitol is added as a nucleating agent and no organic peroxide is added, and a molded article obtained when injection molding is performed using this polypropylene composition The warpage measurement results are shown in Table 2. The injection molding method for the disk and the method for measuring warpage were the same as in Example 1.
【表】【table】
【表】
実施例 ２
MI1.7のポリプロピレン100重量部に、核剤と
して１，３，２，４−ジ（メチルベンジリデン）
ソルビトールを0.3重量部、有機過酸化物として
１，３−ビス−（ｔ−ブチルパーオキシイソプロ
ピル）ベンゼンを0.04重量部添加して混合し、押
出機で樹脂温度260℃で混練してペレツト化した。
この分解ポリプロピレン組成物を用いて、樹脂温
度230℃、射出圧力500Kg／cm2、金型温度60℃で
種々の冷却時間で実施例１と同様な大きさの円板
を射出成形し、そりを測定した。
冷却時間とそりの測定結果を第３表に示す。[Table] Example 2 1,3,2,4-di(methylbenzylidene) was added as a nucleating agent to 100 parts by weight of polypropylene of MI1.7.
0.3 parts by weight of sorbitol and 0.04 parts by weight of 1,3-bis-(t-butylperoxyisopropyl)benzene as an organic peroxide were added and mixed, and the mixture was kneaded with an extruder at a resin temperature of 260°C to form pellets. .
Using this decomposed polypropylene composition, a disk of the same size as in Example 1 was injection molded at a resin temperature of 230°C, an injection pressure of 500Kg/cm 2 , a mold temperature of 60°C, and various cooling times to eliminate warpage. It was measured. Table 3 shows the cooling time and warpage measurement results.
【表】
比較例 ２
MI15.0の市販のポリプロピレンを用いた以外
は、実施例２と同様にして射出成形を行い円板を
作成し、得られる成形体のそりを測定した。
結果を第４表に示す。[Table] Comparative Example 2 A disc was produced by injection molding in the same manner as in Example 2, except that commercially available polypropylene with an MI of 15.0 was used, and the warpage of the resulting molded product was measured. The results are shown in Table 4.
【表】
比較例 ３
MI15.0の市販のポリプロピレン100重量部に、
核剤として１，３，２，４−ジ（メチルベンジリ
デン）ソルビトールを0.3重量部添加し、実施例
２と同様な方法及び射出成形条件で円板を作成
し、そりを測定した。
結果を第５表に示す。[Table] Comparative Example 3 To 100 parts by weight of commercially available polypropylene with MI15.0,
0.3 parts by weight of 1,3,2,4-di(methylbenzylidene) sorbitol was added as a nucleating agent, and a disk was prepared using the same method and injection molding conditions as in Example 2, and warpage was measured. The results are shown in Table 5.
【表】
実施例 ３
エチレン含有量2.6重量％、MI1.4のエチレン−
プロピレン・ブロツク共重合体100重量部に、核
剤として１，３，２，４−ジ（メチルベンジリデ
ン）ソルビトール及び有機過酸化物として１，３
−ビス（ｔ−ブチルパーオキシイソプロピロー
ル）ベンゼンを所定の割合で混練してペレツト化
した。
この分解ポリプロピレン組成物を用いて実施例
１と同様な方法で円板を作成し、そりを測定し
た。
組成物の添加剤配合量及びMI、分子量分布、
そりの測定結果を第６表に示す。[Table] Example 3 Ethylene with an ethylene content of 2.6% by weight and an MI of 1.4.
100 parts by weight of propylene block copolymer, 1,3,2,4-di(methylbenzylidene) sorbitol as a nucleating agent and 1,3 as an organic peroxide.
-Bis(t-butylperoxyisopropyrrol)benzene was kneaded at a predetermined ratio to form pellets. A disk was made using this decomposed polypropylene composition in the same manner as in Example 1, and warpage was measured. Additive content and MI of the composition, molecular weight distribution,
The warpage measurement results are shown in Table 6.
【表】
実施例 ４
実施例３と同様なエチレン−プロピレン・ブロ
ツク共重合体100重量部に結晶核剤としてジ−（パ
ラ−ｔブチル安息香酸アルミニウム）及び有機過
酸化物として１，３−ビス−（ｔ−ブチルパーオ
キシイソプロピロール）ベンゼンを所定の割合で
混合し、押出機で樹脂温度260℃で混練しペレツ
ト化した。この分解ポリプロピレン組成物を用い
て実施例１と同様な射出成形方法で円板を作成
し、得られた成形体のそりを測定した。
組成物の添加剤配合量及びMI、分子量分布、
そりの測定結果を第７表に示す。[Table] Example 4 100 parts by weight of the same ethylene-propylene block copolymer as in Example 3 was added with di-(para-t-butylaluminum benzoate) as a crystal nucleating agent and 1,3-bis as an organic peroxide. -(t-Butylperoxyisopropyrrole)benzene was mixed in a predetermined ratio and kneaded with an extruder at a resin temperature of 260°C to form pellets. Using this decomposed polypropylene composition, a disk was made by the same injection molding method as in Example 1, and the warpage of the obtained molded product was measured. Additive content and MI of the composition, molecular weight distribution,
The warpage measurement results are shown in Table 7.
【表】
実施例 ５
MI1.7のポリプロピレン100重量部に有機過酸
化物として１，３−ビス−（δ−ブチルパーオキ
シイソプロピル）ベンゼンを0.04重量部添加して
混合し、押出機で樹脂温度260℃にて混練し、
MI15ｇ／10分、分子量分布（ｗ／ｎ）4.0に
調整した。この分解ポリプロピレンに結晶核剤と
して、１，３，２，４−ジ（メチルベンジリデ
ン）ソルビトールを第８表に示す配合割合で添加
して混合し、射出圧力500Kg／cm2、金型温度60℃
で、第８表に示すように冷却時間を変化させて実
施例１と同様な大きさの円板を射出成形し、そり
を測定した。[Table] Example 5 0.04 parts by weight of 1,3-bis-(δ-butylperoxyisopropyl)benzene as an organic peroxide was added to 100 parts by weight of polypropylene with an MI of 1.7, mixed, and the resin temperature was adjusted using an extruder. Knead at 260℃,
MI15g/10min, molecular weight distribution (w/n) was adjusted to 4.0. To this decomposed polypropylene, 1,3,2,4-di(methylbenzylidene) sorbitol was added as a crystal nucleating agent in the proportion shown in Table 8 and mixed, injection pressure was 500 Kg/cm 2 and mold temperature was 60°C.
Discs of the same size as in Example 1 were injection molded by varying the cooling time as shown in Table 8, and warpage was measured.
Claims (1)
て有機過酸化物0.001〜１重量％よりなる混合物
を、該ポリプロピレンの融点以上で且つ該有機過
酸化物の分解温度以上、300℃以下の温度で加熱
処理して得られる重量平均分子量（ｗ）と数平
均分子量（ｎ）との比（ｗ／ｎ比）が５以
下の分解ポリプロピレン組成物を射出成形するこ
とを特徴とする成形体の製造方法。1. Obtained by heating a mixture consisting of polypropylene and 0.001 to 1% by weight of an organic peroxide based on the polypropylene at a temperature above the melting point of the polypropylene and above the decomposition temperature of the organic peroxide and below 300 ° C. A method for producing a molded article, which comprises injection molding a decomposed polypropylene composition having a ratio of weight average molecular weight (w) to number average molecular weight (n) (w/n ratio) of 5 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15555184A JPS6134039A (en) | 1984-07-27 | 1984-07-27 | Polypropylene composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15555184A JPS6134039A (en) | 1984-07-27 | 1984-07-27 | Polypropylene composition |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3270689A Division JPH02138347A (en) | 1989-02-14 | 1989-02-14 | Polypropylene composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6134039A JPS6134039A (en) | 1986-02-18 |
| JPH0449576B2 true JPH0449576B2 (en) | 1992-08-11 |
Family
ID=15608534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15555184A Granted JPS6134039A (en) | 1984-07-27 | 1984-07-27 | Polypropylene composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6134039A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62115049A (en) * | 1985-11-14 | 1987-05-26 | Sumitomo Chem Co Ltd | Impact-resistant polypropylene composition |
| JPS62115050A (en) * | 1985-11-14 | 1987-05-26 | Sumitomo Chem Co Ltd | Impact-resistant polypropylene sheet |
| JPH0699616B2 (en) * | 1986-04-14 | 1994-12-07 | 株式会社トクヤマ | Resin composition |
| JP2794890B2 (en) * | 1990-04-09 | 1998-09-10 | 三菱化学株式会社 | Method for producing propylene resin molded article having hard coat layer |
| JP3138838B2 (en) * | 1992-04-30 | 2001-02-26 | 東レ・ダウコーニング・シリコーン株式会社 | Manufacturing method of mixed powder |
| JP4767624B2 (en) * | 2005-08-24 | 2011-09-07 | 豊和化成株式会社 | Air blower for vehicle interior |
| CN109734997A (en) * | 2018-12-18 | 2019-05-10 | 东华能源(宁波)新材料有限公司 | A method of polypropylene material is prepared using hydrogen reconciliation edman degradation Edman |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5887024A (en) * | 1981-11-19 | 1983-05-24 | Sumitomo Chem Co Ltd | Polypropylene stretched film |
| JPS58134714A (en) * | 1982-02-03 | 1983-08-11 | Sumitomo Chem Co Ltd | Manufacture of polypropylene drawn film |
| JPS58157841A (en) * | 1982-03-15 | 1983-09-20 | Mitsubishi Petrochem Co Ltd | Propylene polymer composition |
| JPS58180543A (en) * | 1982-04-19 | 1983-10-22 | Mitsubishi Petrochem Co Ltd | Propylene polymer composition |
| JPS5912951A (en) * | 1982-07-14 | 1984-01-23 | New Japan Chem Co Ltd | Crystalline resin composition |
-
1984
- 1984-07-27 JP JP15555184A patent/JPS6134039A/en active Granted
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5887024A (en) * | 1981-11-19 | 1983-05-24 | Sumitomo Chem Co Ltd | Polypropylene stretched film |
| JPS58134714A (en) * | 1982-02-03 | 1983-08-11 | Sumitomo Chem Co Ltd | Manufacture of polypropylene drawn film |
| JPS58157841A (en) * | 1982-03-15 | 1983-09-20 | Mitsubishi Petrochem Co Ltd | Propylene polymer composition |
| JPS58180543A (en) * | 1982-04-19 | 1983-10-22 | Mitsubishi Petrochem Co Ltd | Propylene polymer composition |
| JPS5912951A (en) * | 1982-07-14 | 1984-01-23 | New Japan Chem Co Ltd | Crystalline resin composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6134039A (en) | 1986-02-18 |
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