JPS59142111A - Manufacture of synthetic resin molded item - Google Patents

Manufacture of synthetic resin molded item

Info

Publication number
JPS59142111A
JPS59142111A JP58015593A JP1559383A JPS59142111A JP S59142111 A JPS59142111 A JP S59142111A JP 58015593 A JP58015593 A JP 58015593A JP 1559383 A JP1559383 A JP 1559383A JP S59142111 A JPS59142111 A JP S59142111A
Authority
JP
Japan
Prior art keywords
resin sheet
resin
molded
synthetic resin
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.)
Pending
Application number
JP58015593A
Other languages
Japanese (ja)
Inventor
Masamitsu Oda
小田　正光
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP58015593A priority Critical patent/JPS59142111A/en
Publication of JPS59142111A publication Critical patent/JPS59142111A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/20—Making multilayered or multicoloured articles
    • B29C43/203—Making multilayered articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/06—Unsaturated polyesters

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

PURPOSE:To prevent surface sink marks from occurring, by press molding under heating simultaneously a first resin sheet and a second resin sheet whose setting start times are different, so that the first resin sheet whose setting start is earlier than that of the second resin sheet is allowed to set prior to the setting of the second resin sheet to form a surface layer and then the second resin sheet is molded to form an undersurface later with projections. CONSTITUTION:The first resin sheet (A) consists of an unsaturated polyeter resin and 0.8-1.2pts.wt. first hardening agent. The second resin sheet (B) consists of an unsaturated polyester resin and 0.8-1.2pts.wt. second hardening agent whose setting start time is 30-60sec slower than that of the first hardening agent. The second resin sheet (B) is placed on the molding surface of a bottom force 5 that will mold projections on an intended item, then the first resin sheet (A) is placed thereon and they are press molded between a top force 6 and the bottom force 5 under heating. An integrally molded item can be obtained that includes as a surface layer the first resin sheet (A) and as an undersurface layer with projections the second resin sheet (B). Since the surface layer is set prior to the undersurface, surface sink marks would hardly occur.

Description

【発明の詳細な説明】 本発明は、裏面にリブ、ボスを有する合成樹脂成形品の
表面ひけの防Ｗを考慮した製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a synthetic resin molded product having ribs and bosses on its back surface, taking into consideration prevention of surface sinkage.

軽量化のための合成樹脂成形品、例えば自動車のボンネ
ットでは、第１図に示す如く、強度不足を補うためにボ
ンネット１の裏面１ａに多数の補強リブ２．・・・、２
や取付用ボス３．・・・、３を一体成形するが、特にボ
ス３の部分はボリウム（容量）があるので樹脂硬化タイ
ミングが遅れるため、ボス３に対応するボンネット１の
表面１１）（第２図参照）にゞひけ′を生じ、製品の見
栄え上好ましくないものであった。As shown in FIG. 1, in synthetic resin molded products for weight reduction, such as automobile bonnets, a large number of reinforcing ribs 2. ..., 2
and mounting boss 3. ..., 3 are integrally molded, but since the resin curing timing is delayed because the boss 3 has a volume, the surface 11) of the bonnet 1 corresponding to the boss 3 (see Figure 2) is This caused sink marks, which was unfavorable for the appearance of the product.

このようなゞひけ′を防止するために、二部式射出成形
機を用いて、無機充填剤または発泡剤を含有する合成樹
脂中心層の両表面にスチレン系またはオレフィン系樹脂
を被覆する合成樹脂成形品の製造方法が提案されている
か（特開昭５６−６０２３９号）、実際上、成形が困難
であるうえボンネットのような比較的薄肉で広面積の成
形品には適用し難いものであった。In order to prevent such shrinkage, a two-part injection molding machine is used to coat the synthetic resin core layer with styrene or olefin resin on both surfaces of the synthetic resin core layer containing an inorganic filler or blowing agent. A method for manufacturing molded products has been proposed (Japanese Unexamined Patent Publication No. 56-60239), but it is actually difficult to mold and is difficult to apply to relatively thin and wide-area molded products such as bonnets. Ta.

本発明は、上記従来の問題点に鑑みてなされたもので、
基本的には硬化開始時間（タイミング）の異なる２種類
の第１．第２樹脂シートを同時に熱プレス成形して、硬
化開始タイミングの早い第１樹脂シートを先に硬化させ
てひけを発生させることなく、まず表面層を成形し、つ
いで突出部（ボス等）のある第２樹脂シートの硬化開始
で裏面層を成形することにより、表面ひけの生じにくい
合成樹脂成形品を容易に成形できるようにしだものであ
る。The present invention has been made in view of the above-mentioned conventional problems.
Basically, there are two types of 1st type with different curing start times (timings). The second resin sheet is hot-press molded at the same time, and the first resin sheet, which starts curing earlier, is cured first without causing sink marks, and the surface layer is molded first, and then the surface layer is formed, and then By molding the back layer at the beginning of curing of the second resin sheet, it is possible to easily mold a synthetic resin molded product that is less prone to surface sink.

このため、本発明は、不飽和ポリエステル樹脂と、硬化
開始時間の早い第１硬化剤０．８〜１．２重量部とから
なる第１樹脂シートと、 不飽和ポリエステル樹脂と、第１樹脂シートの硬化開始
時間より３０〜６０秒遅い硬化開始時間を付与する第２
硬化剤０．８〜１．２重量部とからなる第２樹脂シート
とを用意し、 上記第２〜樹脂シートを合成樹脂成形品の突出部を成形
する型の成形面側に配置して、上記第１樹脂シートと第
２樹脂シートとを重ねて下型の成形面上に載置し、その
後、上型と下型とで上記両樹脂シートを熱プレス成形し
、上記合成樹脂成形品の表面層を上記第１樹脂シートで
成形するとともに突出部を有する裏面層を上記第２樹脂
シートで成形した一体成形の合成樹脂成形品を得ること
を特徴とするものである。For this reason, the present invention provides a first resin sheet comprising an unsaturated polyester resin and 0.8 to 1.2 parts by weight of a first curing agent that has a quick curing start time, an unsaturated polyester resin, and a first resin sheet. A second curing start time that is 30 to 60 seconds later than the curing start time of
A second resin sheet consisting of 0.8 to 1.2 parts by weight of a curing agent is prepared, and the second resin sheet is placed on the molding surface side of a mold for molding the protrusion of the synthetic resin molded product, The first resin sheet and the second resin sheet are stacked and placed on the molding surface of the lower mold, and then both resin sheets are heat press molded using the upper mold and the lower mold to form the synthetic resin molded product. The present invention is characterized in that an integrally molded synthetic resin molded article is obtained in which a surface layer is molded with the first resin sheet and a back layer having a protrusion is molded with the second resin sheet.

以下、実施例を説明する。Examples will be described below.

上記第１゜第２樹脂シート（コンパウンド）Ａ。The above 1st and 2nd resin sheet (compound) A.

Ｂの組成を表１のように設定した。The composition of B was set as shown in Table 1.

表１ 上記硬化剤の種類と使用量は次のように設定した。Table 1 The type and amount of the curing agent used were set as follows.

第２樹脂シートＢ（ボス、リブのある裏面Ｊ＠　）に使
用する硬化剤は、ターシーヤリーブチルノＲ−オキシベ
ンゾエートおよび／またはジターシャリ−ブチルパーオ
キシドである。The curing agent used for the second resin sheet B (back side J@ with bosses and ribs) is tert-butyl-R-oxybenzoate and/or di-tert-butyl peroxide.

使用］嚢は、ポリエステルに対して０．８〜１．２重量
部とした。０．８重量部以下では、硬化開始時間が遅れ
（効果飽和）成形サイクルが長くなり、１．２重量部以
上では硬化開始時間が早くなりすぎる。Use] The amount of the bag was 0.8 to 1.2 parts by weight based on the polyester. If it is less than 0.8 parts by weight, the curing start time will be delayed (effect saturation) and the molding cycle will be lengthened, and if it is more than 1.2 parts by weight, the curing start time will be too early.

第１樹脂シー）Ａ（表面層）に使用する硬化剤は、ター
シャリ−ブチルパーオキシベンゾエートおよび１・１−
ビス（ターシャリ−ブチルパーオキシ）−３，３，５−
）リメチルシクロヘキサンの併用である。The curing agent used in the first resin sheet) A (surface layer) is tertiary-butyl peroxybenzoate and 1.1-
Bis(tert-butylperoxy)-3,3,5-
) is used in combination with limethylcyclohexane.

使用量は、ポリエステルに対して０．８〜１．２重量部
とした。０．８重量部以下では、硬化開始時間が遅れ（
効果飽和）、１．２重量部以上では硬化開始時間が早く
なりすぎ（効果飽和）ピンホールか発生する。The amount used was 0.8 to 1.2 parts by weight based on the polyester. If it is less than 0.8 parts by weight, the curing start time will be delayed (
If the amount exceeds 1.2 parts by weight, the curing start time will be too early (effect saturation), and pinholes will occur.

併用割合は、ターシャリ−ブチルパーオキシベンゾエー
トに対して、１．１−ビス（ターシャリ−ブチルパーオ
キシ）−３，３，５−トリメチルシクロヘキサンが、第
２樹脂シートＢの硬化開始時間の３７５〜４１５に短縮
したい場合は３０〜５０重量％、同じ＜４１５〜４．５
７５に短縮したい場合は５０〜８０重量％、同じく１／
２に短縮したい場合は８０〜１００重量％とする。The ratio of 1.1-bis(tertiary-butylperoxy)-3,3,5-trimethylcyclohexane to tertiary-butylperoxybenzoate is 375 to 415, which is the curing start time of the second resin sheet B. If you want to shorten it to 30-50% by weight, same <415-4.5
If you want to shorten it to 75, 50 to 80% by weight, same as 1/
If you want to shorten it to 2, it should be 80 to 100% by weight.

実施例のボンネット１用として、第１樹脂シートＡの硬
化剤を、ターシャリープチルパーオキシベンソニー）５
０ｉｉ％、１．１ビス（ターシャリ−ブチルパーオキシ
）−３，３，５−）リメチルシクロヘキサン５０重険％
とし、第２樹脂シートＢの硬化剤を、ターシャリ−ブチ
ルパーオキシベンゾエートとして、第１．第２樹脂シー
トＡ。For the bonnet 1 of the example, the curing agent for the first resin sheet A was tertiarybutylperoxybenthony) 5
0ii%, 1.1bis(tert-butylperoxy)-3,3,5-)limethylcyclohexane 50%
and the curing agent of the second resin sheet B was tertiary-butyl peroxybenzoate, and the curing agent of the second resin sheet B was tertiary-butyl peroxybenzoate. Second resin sheet A.

Ｉλへの使用量を各々０．８　、１．０　、１．２重量
部に設定した場合の加圧時間と硬度（Ａ　Ｓ　ＴＭ　　
ＴＹＰＥＤ）との関係を第３図に示すとともに硬化（ゲ
ル化）開始時間を第２表にまとめた。Pressure time and hardness (A S TM
TYPED) is shown in FIG. 3, and the curing (gelation) start time is summarized in Table 2.

表２ 第１樹脂シートＡと第２樹脂シートＢの硬化開始時間差
（タイミングのずんは、後述の如＜３０〜６０秒が適当
であるから、繭ｌ樹脂シートＡと第２樹脂シー）Ｂとの
適当な組合わせは第３表の通りである。Table 2 Difference in curing start time between the first resin sheet A and the second resin sheet B (the appropriate timing is <30 to 60 seconds as described later) Appropriate combinations of are shown in Table 3.

表３ つぎに、第１樹脂シートＡと第２樹脂シートＢの硬化タ
イミングのずれは、３０〜６０秒以内に設定する。Table 3 Next, the difference in curing timing between the first resin sheet A and the second resin sheet B is set within 30 to 60 seconds.

６０秒以・上であると第１樹脂シートＡの硬化が進み過
ぎて第２樹脂シートＢの密着性（密着強度）が悪化し、
３０秒以下であると、第２図の硬化開始時間差とひけ量
との関係グラフから明らかなように、ハツチングで示し
たバラツキの範囲で表面ひけ４が発生する。３０秒以上
であるとひけ射は最大１２μ程度であるからほとんど目
立つことがない。なお、第２図は、板厚【２３騎・ボス
３の高−Ｊ　＋１　＝　、２　Ｑ　１ｍ　ｌ直径Ｄ＝１
０關の場合の実施例のボンネット１のデータである。If it is 60 seconds or more, the curing of the first resin sheet A will progress too much and the adhesion (adhesion strength) of the second resin sheet B will deteriorate.
If it is 30 seconds or less, surface sink 4 occurs within the range of variation shown by hatching, as is clear from the graph of the relationship between curing start time difference and sink amount in FIG. If the time is 30 seconds or more, the shrinkage is about 12μ at most, so it is hardly noticeable. In addition, Fig. 2 shows the plate thickness [23 mm/height of boss 3 - J +1 = , 2 Q 1 ml diameter D = 1
This is data of the bonnet 1 of the example in the case of 0 ratio.

一方、成形機は、第５図に示すように下型（コア）５を
１３８〜１４１℃に加熱し、上型（キャビティ）６を１
４３〜１４６°Ｃに加熱した（上・下型６．５の温度差
を５°Ｃとする）。On the other hand, as shown in FIG.
It was heated to 43 to 146°C (temperature difference between upper and lower molds 6.5 is 5°C).

上、下型６．５の加圧力は６０〜９０Ｋｇ／ｃｒＲとし
た（実施例のホンネットｌでは７０　Ｋｇ／ＣＪ　とし
た。）。The pressing force of the upper and lower molds 6.5 was 60 to 90 Kg/crR (70 Kg/CJ for Honnet I in the example).

加圧時間は２．５〜３．０分とした（実施例のボンネッ
ト１では３．０分とした。）。The pressurization time was set to 2.5 to 3.0 minutes (3.0 minutes for the bonnet 1 of the example).

まり、実施例のボンネットのチャージ重量（樹脂シート
重量）は、ｌ　Ｏ，５Ｋｇ　（第１樹脂シートＡ５、２
５　Ｋ闘、第２樹脂シー）　Ｂ　５．２５　Ｋｇ）とし
た。Therefore, the charge weight (resin sheet weight) of the bonnet in the example is 1 O, 5Kg (first resin sheet A5, 2
5 Kg, 2nd Resin Sea) B 5.25 Kg).

そして、上述（表３）の実施例のボンネット１の組成を
有する第１樹脂シー）Ａと第２樹脂シー−トＢとを連ね
て下型５の成形面上に載置し、その後、上型６と下型５
とで両樹脂シートＡ、Ｂを熱プレス成形した。なお、両
樹脂シートＡ、Ｂは、各々約３　ｍｙｔ厚のシートを約
５枚づつ重ね合わせたものである。Then, the first resin sheet A and the second resin sheet B having the composition of the bonnet 1 of the example described above (Table 3) are placed in series on the molding surface of the lower mold 5, and then the upper Mold 6 and lower mold 5
Both resin sheets A and B were hot press molded. Note that both resin sheets A and B are made by stacking about 5 sheets each having a thickness of about 3 myt.

この結果、第４図に示すように、上下型６．５による加
圧から、第１樹脂シートＡ（表面層）は約６０秒で硬化
が開始し、第２樹脂シートＢ（裏面層）は約９５秒で硬
化が開始して、硬化開始時間差は約３５秒であったから
、第１樹脂シートＡ。As a result, as shown in FIG. 4, the first resin sheet A (surface layer) starts to harden in about 60 seconds from the pressure applied by the upper and lower molds 6.5, and the second resin sheet B (back layer) Since curing started in about 95 seconds and the curing start time difference was about 35 seconds, the first resin sheet A.

つまりボンネット１の表面１ｂに表面ひけ（１２・μ以
下）はほとんど生じなかった。In other words, almost no surface sink (12 μm or less) occurred on the surface 1b of the bonnet 1.

なお、第１．第２樹脂シー）Ａ、Ｂの境界７は、第６図
に二点鎖線で示したようになると想定される。In addition, 1. The boundary 7 between A and B (second resin seam) is assumed to be as shown by the two-dot chain line in FIG.

以上の説明からも明らかなように、本発明は、硬化開始
時間の早い第１樹脂シートを表面層とし、硬化開始時間
の遅い第２樹脂シートをボス・リブを有する裏面層とし
て、同時に熱プレス成形するものであるから、第１樹脂
シートが先に硬化するため表面ひけが生じにくくなり、
製品の見栄えが良好で製品価値が向上するようになる。As is clear from the above description, in the present invention, a first resin sheet with a quick curing start time is used as a surface layer, a second resin sheet with a slow curing start time is used as a back layer having bosses and ribs, and the heat press is applied simultaneously. Since it is molded, the first resin sheet hardens first, making it difficult for surface sinkage to occur.
The appearance of the product will be good and the product value will improve.

捷だ、成形機は既存のものが利用でき成形作業も容易に
行なうことができる。Fortunately, existing molding machines can be used and the molding work can be done easily.

【図面の簡単な説明】[Brief explanation of drawings]

第１図はボンネットの裏面図、第２図は硬化開始時間差
とひけ量との関係を示すグラフ、第３図は硬化剤の使用
量に対する加圧時間と硬度との関係を示すグラフ、第４
図は実施例のボンネットに用いた硬化剤の使用量に対す
る加圧時間と硬度との関係を示すグラフ、第５図は成形
機の上、下型の断面図、第６図は成形後のボンネット１
の要部断面図である。 １・・・ボンネット、　　１ａ・・・裏面、　　１ｂ・
・・表面、２・・・リブ、　　３・・・ボス、　　４・
・・表面ひけ、　　５・・・下型、　　６・・・上型、
　Ａ・・・第１樹脂シート、　Ｂ・・・第２樹脂シート
。Figure 1 is a back view of the bonnet, Figure 2 is a graph showing the relationship between curing start time difference and sinkage amount, Figure 3 is a graph showing the relationship between hardness and pressurization time with respect to the amount of curing agent used, and Figure 4
The figure is a graph showing the relationship between the amount of curing agent used and the pressure time and hardness used in the bonnet of the example. Figure 5 is a cross-sectional view of the upper and lower molds of the molding machine. Figure 6 is the bonnet after molding. 1
FIG. 1... Bonnet, 1a... Back side, 1b.
...Surface, 2...Rib, 3...Boss, 4...
...Surface sink, 5...Lower mold, 6...Upper mold,
A...First resin sheet, B...Second resin sheet.

Claims (2)

【特許請求の範囲】[Claims] （１）裏面側に突出部を有する合成樹脂成形品を熱プレ
スにより成形する方法であって、不飽和ポリエステル樹
脂と、硬化開始時間の早い第１硬化剤０．８〜１．２重
量部とからなる第１．樹脂シートと、 不飽和ポリエステル樹脂と、第１樹脂シートの硬化開始
時間より３０〜６０秒遅い硬化開始時間を付与する第２
硬化剤０．８〜１，２重量部とからなる第２樹脂シート
とを用意し、 」二記第２樹脂シートを合成樹脂成形品の突出部を成形
する型の成形面側に配置して、上記第１樹脂シートと第
２樹脂シートとを重ねて下型の成形面−にに載置し、そ
の後、上型と下型とで上記両樹脂シートを熱プレス成形
し、上記合成樹脂成形品の表面層を上記第１樹脂シート
で成形するとともに突出部を有する裏面層を上記第２樹
脂シートで成形した一体成形の合成樹脂成形品を得るこ
とを特徴とする合成樹脂成形品の製造方法。(1) A method of molding a synthetic resin molded article having a protrusion on the back side by hot pressing, the method comprising: an unsaturated polyester resin; and 0.8 to 1.2 parts by weight of a first curing agent having a quick curing start time; The first part consists of a resin sheet, an unsaturated polyester resin, and a second resin sheet having a curing start time that is 30 to 60 seconds later than the curing start time of the first resin sheet.
A second resin sheet consisting of 0.8 to 1.2 parts by weight of a curing agent is prepared, and the second resin sheet is placed on the molding surface side of a mold for molding the protruding portion of the synthetic resin molded product. , the first resin sheet and the second resin sheet are stacked and placed on the molding surface of the lower mold, and then both the resin sheets are hot press molded with the upper mold and the lower mold, and the synthetic resin molding is performed. A method for manufacturing a synthetic resin molded product, which comprises obtaining an integrally molded synthetic resin product in which the surface layer of the product is molded with the first resin sheet and the back layer having a protrusion is molded with the second resin sheet. . （２）上記第１硬化剤が、ターシャリ−ブチルパーオキ
シベンゾエートおよび１・１−ビス（ターシャリ−ブチ
ルパーオキシ）−３・３・５−トリメチルシクロヘキサ
ンからなり、上記第２硬化剤カ、ターシャリ−ブチルパ
ーオキシベンゾエートおよび／もしくはジターシャリ−
ブチルパーオキシドからなることを特徴とする特許請求
の範囲第（１）項記載の合成樹脂成形品の製造方法。(2) The first curing agent is composed of tert-butyl peroxybenzoate and 1,1-bis(tert-butyl peroxy)-3,3,5-trimethylcyclohexane, and the second curing agent is tert-butyl peroxybenzoate. Butyl peroxybenzoate and/or ditertiary
The method for producing a synthetic resin molded article according to claim (1), characterized in that it is made of butyl peroxide.
JP58015593A 1983-02-01 1983-02-01 Manufacture of synthetic resin molded item Pending JPS59142111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58015593A JPS59142111A (en) 1983-02-01 1983-02-01 Manufacture of synthetic resin molded item

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58015593A JPS59142111A (en) 1983-02-01 1983-02-01 Manufacture of synthetic resin molded item

Publications (1)

Publication Number Publication Date
JPS59142111A true JPS59142111A (en) 1984-08-15

Family

ID=11893014

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58015593A Pending JPS59142111A (en) 1983-02-01 1983-02-01 Manufacture of synthetic resin molded item

Country Status (1)

Country Link
JP (1) JPS59142111A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017013430A (en) * 2015-07-03 2017-01-19 本田技研工業株式会社 Resin product and method for producing the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017013430A (en) * 2015-07-03 2017-01-19 本田技研工業株式会社 Resin product and method for producing the same

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