JPH06845B2 - Large injection compression molding method - Google Patents
Large injection compression molding methodInfo
- Publication number
- JPH06845B2 JPH06845B2 JP12953483A JP12953483A JPH06845B2 JP H06845 B2 JPH06845 B2 JP H06845B2 JP 12953483 A JP12953483 A JP 12953483A JP 12953483 A JP12953483 A JP 12953483A JP H06845 B2 JPH06845 B2 JP H06845B2
- Authority
- JP
- Japan
- Prior art keywords
- polycarbonate
- compression molding
- molding method
- molded product
- injection compression
- 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
Description
【発明の詳細な説明】 本発明はポリカーボネートの大型射出圧縮成形法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a large injection compression molding method for polycarbonate.
従来から、樹脂成形法としては主に射出成形法、圧縮成
形法が広く適用されている。しかしながら、射出成形法
の場合、得られた成形品、とくに大型で薄い成形品には
成形時の歪み蓄積に基づくソリ若しくはクラックの発生
が起こり易く、また、樹脂を金型に射出注入するときの
部分的な流れ遅延に基づくフローマーク（流れ模様）の
発生が生じ易く、そのため、成形できる成形品の大きさ
は制限を受け、その均一性を一定に保つということは困
難であるという問題が派生している。一方、圧縮成形法
の場合には、射出成形法と異なって、成形品の均一性は
保持されるものの、長い成形時間を要するという欠点が
ある。Conventionally, injection molding methods and compression molding methods have been widely applied as resin molding methods. However, in the case of the injection molding method, warpage or cracking is likely to occur in the obtained molded product, especially a large and thin molded product due to strain accumulation at the time of molding, and when the resin is injected and injected into the mold. Flow marks (flow patterns) are likely to occur due to partial flow delay, which limits the size of the molded product that can be molded, and it is difficult to maintain its uniformity. is doing. On the other hand, in the case of the compression molding method, unlike the injection molding method, the uniformity of the molded product is maintained, but there is a drawback that a long molding time is required.
このようなことから、最近では樹脂の成形法として射出
圧縮成形法が検討されるようになっている。Under these circumstances, injection compression molding has recently been studied as a resin molding method.
この方法は、ポジティブ型の金型を用い、この金型を予
め少し開いておくか又は弱い型締力で閉じておき、ここ
に溶融した樹脂原料を所定圧力で射出注入して充填し、
しかる後に型締力を増加して圧縮成形するという方法で
ある。いわば、射出成形と圧縮成形のハイブリッドであ
る。しかしながら、この方法に関しては、用いる装置の
型締機構につき種々の提案がなされているのみで、この
方法で成形すべき原料樹脂の必要物性等については充分
な検討は加えられていないというのが現状である。This method uses a positive mold, and the mold is opened a little beforehand or closed with a weak mold clamping force, and the molten resin raw material is injected and filled at a predetermined pressure into the mold,
After that, the mold clamping force is increased to perform compression molding. It is, so to speak, a hybrid of injection molding and compression molding. However, regarding this method, only various proposals have been made regarding the mold-clamping mechanism of the apparatus to be used, and the present situation is that sufficient studies have not been made on the required physical properties of the raw material resin to be molded by this method. Is.
ところで、各種の樹脂のうちポリカーボネートは、二価
フェノールから誘導される基本分子がカーボネート連鎖
により相互に結合した構造の線状重合体であり、これは
透明で耐水性に優れ、機械的強度とりわけ耐衝撃性に優
れたエンジニアリングプラスチックとして知られてい
る。By the way, among various resins, polycarbonate is a linear polymer having a structure in which basic molecules derived from a dihydric phenol are bonded to each other by a carbonate chain, and this is transparent and excellent in water resistance, and particularly in mechanical strength. It is known as an engineering plastic with excellent impact properties.
しかしながら、ポリカーボネートは流動性が充分に大き
くならない。そのため、射出圧縮成形法を適用してポリ
カーボネートの成形品を成形した場合、投影面積が800c
m2以上の大型成形品になると、その衝撃強度が大幅に低
下し、しかもフローマークの発生等により外観が損なわ
れるようになる。したがって、ポリカーボネートの成形
においては、射出圧縮成形法は比較的小型形状の成形品
についてしか適用されていない。However, polycarbonate does not have sufficiently high fluidity. Therefore, when a polycarbonate molded product is molded using the injection compression molding method, the projected area is 800c.
If it is a large-sized molded product of m 2 or more, its impact strength is significantly lowered, and the appearance is deteriorated due to the generation of flow marks. Therefore, in the molding of polycarbonate, the injection compression molding method is applied only to a molded product having a relatively small shape.
以上のようなことから、本発明者らは、ポリカーボネー
トの大型成形品の射出圧縮成形法における上記問題点を
解消すべく用いるポリカーボネートの物性と成形性との
関係につき鋭意研究を重ねた結果、特定の物性を有する
ポリカーボネートを用いれば、投影面積8002以上であっ
ても衝撃強度大で外観も良好な大型成形品を容易に製造
し得るとの事実を見出し本発明のポリカーボネートを開
発するに至つた。From the above, the inventors of the present invention have conducted extensive studies on the relationship between the physical properties and the moldability of the polycarbonate used to solve the above problems in the injection compression molding method of a large polycarbonate molded product, By using a polycarbonate having the above physical properties, it was found that it is possible to easily produce a large-sized molded product having a large impact strength and a good appearance even if the projected area is 800 2 or more, and has led to the development of the polycarbonate of the present invention. .
すなわち、本発明の目的は、特定のポリカーボネートを
用いて大型成形品を成形する射出圧縮成形法を提供する
ことである。That is, an object of the present invention is to provide an injection compression molding method for molding a large-sized molded product using a specific polycarbonate.
本発明で用いるポリカーボネートは、 一般式 で示される構造単位からなるポリカーボネートであっ
て、粘度平均分子量（V）が24000〜35000、重量平均
分子量（W）と数平均分子量（N）との比（W／
N）が1.9〜3.6及び流れ値が0.010〜0.055ml/secであ
ることを特徴とする大型射出圧縮成形用樹脂である。V が24000未満の場合には得られた成形品の衝撃強度が
低下し、35000を超えると流動性が低下してフローマー
クが多発する。本発明にあっては、Vが26000〜30000
でることが好ましい。W ／Nが1.9未満の場合には流動性が低下し、逆に3.6
を超えると成形品の衝撃強度が低下する。好ましくは2.
5〜3.4である。The polycarbonate used in the present invention has the general formula A polycarbonate having a structural unit represented by, having a viscosity average molecular weight ( V ) of 24000 to 35,000 and a ratio of the weight average molecular weight ( W ) to the number average molecular weight ( N ) ( W /
N ) is 1.9 to 3.6 and the flow value is 0.010 to 0.055 ml / sec, which is a large-sized injection compression molding resin. When V is less than 24,000, the impact strength of the obtained molded article is lowered, and when it exceeds 35,000, the fluidity is lowered and flow marks frequently occur. In the present invention, V is 26000 to 30000.
Is preferable. When W / N is less than 1.9, liquidity decreases and conversely 3.6
If it exceeds, the impact strength of the molded product decreases. Preferably 2.
5 to 3.4.
本発明でいう流れ値はJIS K7210で規定する流れ試験で
測定した値である。この流れ値が0.010ml/secより小さ
くなると流動性の低下を招き成形品にフローマークが多
発し、また0.055ml/secより大きくなると成形品の衝撃
強度の低下を招来する。好ましくは0.015〜0.040ml/sec
である。The flow value referred to in the present invention is a value measured by a flow test specified in JIS K7210. If this flow value is less than 0.010 ml / sec, the fluidity will be reduced, and flow marks will occur frequently on the molded product, and if it is greater than 0.055 ml / sec, the impact strength of the molded product will be reduced. Preferably 0.015-0.040 ml / sec
Is.
本発明のポリカーボネートは公知の各種製造法で製造し
たものであってよい。例えば、ビスフェノールＡとホス
ゲンとの直接反応によるホスゲン法又はビスフェノール
Ａに炭酸エステルを反応させるエステル交換法などから
製造されたものでよい。The polycarbonate of the present invention may be manufactured by various known manufacturing methods. For example, it may be produced by a phosgene method by a direct reaction of bisphenol A and phosgene, or a transesterification method of reacting bisphenol A with a carbonate ester.
なお、本発明で用いるポリカーボネートを射出圧縮成形
する際に、これに以下のような公知の添加剤、すなわ
ち、亜リン酸エステル系、リン酸エステル系などの酸化
防止剤；ベンゾトリアゾール系、ベンゾフェノン系など
の紫外線吸収剤；脂肪族カルボン酸エステル系、パラフ
ィン系などの外部滑剤を添加してもよい。In addition, when the polycarbonate used in the present invention is injection-compressed and molded, known additives such as antioxidants such as phosphite ester and phosphate ester; benzotriazole and benzophenone UV absorbers such as; external lubricants such as aliphatic carboxylic acid ester type and paraffin type may be added.
本発明によれば、衝撃強度が大で外観も良好で、投影面
積が800cm2、好ましくは1000cm2以上と大きく厚みも１
〜７mmで曲面を有する大型のポリカーボネート成形品を
容易に製造することができる。これら成形品はオートバ
イの風防、自動車のリヤウインドなどに用いることがで
きて有用である。According to the present invention, the appearance impact strength at large is good, and the projected area of 800 cm 2, also preferably 1000 cm 2 or more and greater thickness 1
A large-sized polycarbonate molded product having a curved surface of ˜7 mm can be easily manufactured. These molded products can be used for windshields of motorcycles, rear windows of automobiles, etc. and are useful.
以下に本発明を実施例に基づいて更に詳細に説明する。Hereinafter, the present invention will be described in more detail based on examples.
実施例 表に示した物性の各種の、一般式、 で示される構造単位からなるポリカーボネートを常法に
より調製し、各ポリカーボネートを射出部の樹脂温度33
0℃、金型温度100℃の条件で金型内に射出注入して充填
し、その後金型を動かして500トンの圧力で圧縮したま
ま40秒間冷却し、曲面形状の射出圧縮成形品を得た。こ
の成形品の投影面積は1840cm2（縦40cm、横46cm）であ
り成形品の厚みは2.5mmであった。成形品について、AST
MD256に準拠してアイゾット衝撃強度を測定し、また外
観を肉眼観察した。その結果を一括して表に示した。Examples of various physical properties shown in the table, general formula, A polycarbonate consisting of the structural unit shown in is prepared by a conventional method, and each polycarbonate is injected at a resin temperature of 33
Injection injection into the mold at 0 ° C and mold temperature of 100 ° C to fill it, then move the mold and cool for 40 seconds while compressing at a pressure of 500 tons to obtain a curved injection-molded product. It was The projected area of this molded product was 1840 cm 2 (length 40 cm, width 46 cm), and the thickness of the molded product was 2.5 mm. About molded products, AST
The Izod impact strength was measured according to MD256, and the appearance was visually observed. The results are collectively shown in the table.
なお、表中、粘度平均分子量（V）は対象とするポリ
カーボネートを塩化メチレンに溶解し、その溶液の粘度
をウベローデ粘度計で測定しその極限粘度からシュネル
（Schnell）の粘度式を適用して算出した値である。ま
た、重量平均分子量（W）、数平均分子量（N）はい
づれもゲル浸透クロマトグラフィーにより測定した値で
ある。流れ値はJIS K7210の流れ試験法に基づいて得ら
れた値である。In the table, the viscosity average molecular weight ( V ) is calculated by dissolving the target polycarbonate in methylene chloride, measuring the viscosity of the solution with an Ubbelohde viscometer, and applying the Schnell viscosity formula from the limiting viscosity. It is the value. The weight average molecular weight ( W ) and the number average molecular weight ( N ) are values measured by gel permeation chromatography. The flow value is a value obtained based on the flow test method of JIS K7210.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭56−43132（ＪＰ，Ａ) 特開 昭55−27300（ＪＰ，Ａ) 松金幹夫 他２名著 プラスチック材料 講座▲○５▼ポリカーボネート樹脂 昭和 44年９月30日発行 日刊工業新聞社 第 127頁参照 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-43132 (JP, A) JP-A-55-27300 (JP, A) Mikio Matsugane and 2 others Plastic material course ▲ ○ 5 ▼ Polycarbonate resin Showa 44 Issued September 30, 2016 See page 127 of Nikkan Kogyo Shimbun.
Claims (1)
て、粘度平均分子量が２４０００〜３５０００、重量平
均分子量と数平均分子量との比が１．９〜３．６、及び
流れ値が０．０１０〜０．０５５ｍｌ／ｓｅｃであるポ
リカーボネートを用いることを特徴とする大型射出圧縮
成形法。1. A general formula Which has a viscosity average molecular weight of 24000 to 35000, a weight average molecular weight to number average molecular weight ratio of 1.9 to 3.6, and a flow value of 0.010 to 0.055 ml. A large-scale injection compression molding method characterized by using a polycarbonate having a speed of 1 / sec.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12953483A JPH06845B2 (en) | 1983-07-18 | 1983-07-18 | Large injection compression molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12953483A JPH06845B2 (en) | 1983-07-18 | 1983-07-18 | Large injection compression molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6023421A JPS6023421A (en) | 1985-02-06 |
| JPH06845B2 true JPH06845B2 (en) | 1994-01-05 |
Family
ID=15011891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12953483A Expired - Lifetime JPH06845B2 (en) | 1983-07-18 | 1983-07-18 | Large injection compression molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06845B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0615186B2 (en) * | 1987-01-30 | 1994-03-02 | 株式会社高橋精機工業所 | Molding method for synthetic resin products |
| US7135545B2 (en) | 2004-04-29 | 2006-11-14 | Essilor International Compagnie General D'optique | High molecular weight lenses formed from viscosity-specific polycarbonate |
| JP5378700B2 (en) * | 2008-04-04 | 2013-12-25 | 帝人株式会社 | Method of molding aromatic polycarbonate resin molded article and molded article thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU524955B2 (en) * | 1978-08-10 | 1982-10-14 | Gentex Optics Inc | Molding ophthalmic lenses and other articles |
| JPS5643132A (en) * | 1979-09-12 | 1981-04-21 | Kansai Paint Co Ltd | Method and device for decision of floating and flowing state of powdery or granular material |
-
1983
- 1983-07-18 JP JP12953483A patent/JPH06845B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| 松金幹夫他２名著プラスチック材料講座▲○５▼ポリカーボネート樹脂昭和４４年９月３０日発行日刊工業新聞社第１２７頁参照 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6023421A (en) | 1985-02-06 |
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