JPH0564562B2 - - Google Patents

Info

Publication number
JPH0564562B2
JPH0564562B2 JP31356086A JP31356086A JPH0564562B2 JP H0564562 B2 JPH0564562 B2 JP H0564562B2 JP 31356086 A JP31356086 A JP 31356086A JP 31356086 A JP31356086 A JP 31356086A JP H0564562 B2 JPH0564562 B2 JP H0564562B2
Authority
JP
Japan
Prior art keywords
mold
release agent
rubber
parts
mold release
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
Application number
JP31356086A
Other languages
Japanese (ja)
Other versions
JPS63159019A (en
Inventor
Toshihiko Kitaura
Akio Nakamura
Masayuki Sakamoto
Koichi Takashima
Kyotaka Hirakawa
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.)
Nitto Denko Corp
Original Assignee
Nitto Denko 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 Nitto Denko Corp filed Critical Nitto Denko Corp
Priority to JP61313560A priority Critical patent/JPS63159019A/en
Priority to MYPI87003233A priority patent/MY101701A/en
Priority to DE8787119049T priority patent/DE3778667D1/en
Priority to EP87119049A priority patent/EP0272685B1/en
Priority to PH36286A priority patent/PH25385A/en
Priority to KR1019870014790A priority patent/KR950013276B1/en
Publication of JPS63159019A publication Critical patent/JPS63159019A/en
Priority to US07/268,674 priority patent/US4956132A/en
Publication of JPH0564562B2 publication Critical patent/JPH0564562B2/ja
Priority to SG109494A priority patent/SG109494G/en
Granted legal-status Critical Current

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Description

【発明の詳細な説明】[Detailed description of the invention]

〔産業上の利用分野〕 この発明は、熱硬化性樹脂成形材料用の成形金
型等から成形品を円滑に離型させるために用いら
れる離型用シートに関するものである。 〔従来の技術〕 エポキシ樹脂成形材料等の熱硬化性樹脂成形材
料の成形時には、上記熱硬化性樹脂成形材料中に
含まれる離型剤が金型の成形空間であるキヤビテ
イの表面に滲出して離型作用を発揮する。このよ
うな成形を多数回繰り返すと、成形品の離型性が
著しく悪くなつたり、成形品の表面に肌荒れ等の
現象を生じ、成形品表面に光沢等が出ないという
不都合を生じる。この原因は、上記形成材料中に
含まれる離型剤が成形の繰り返しにより上記キヤ
ビテイの表面に順次積層し、次第に酸化劣化して
硬い離型剤の酸化劣化層を形成するためと考えら
れる。すなわち、上記離型剤の酸化劣化層は、表
面が平滑でなく、また離型作用も有していないた
め、上記のような問題を生じるのである。このた
め、従来は、上記エポキシ樹脂成形材料とは別種
のメラミン樹脂成形材料をキヤビテイ内に入れ、
成形を行つてこれを加熱硬化させ、その硬化物に
離型剤酸化劣化層を一体的に付着させ、その状態
で硬化物を上記金型のキヤビテイから取り出すこ
とによりキヤビテイ表面の洗浄を行つている。し
かしながら、このようにする場合には、金型に多
数設けられているキヤビテイに各別にメラミン樹
脂成形材料を充填し、また硬化物を取り出す必要
があり作業が極めて煩雑なうえ、成形時にメラミ
ン樹脂成形材料から生じる臭気により作業環境が
著しく悪化するという問題が生じている。 そこで、本発明者らは、最近、未加硫ゴム生地
を母材とし、その母材中にグリコールエーテル類
を含有させたシート状の金型洗浄剤組成物を開発
しすでに特許出願(特願昭61−252536号)してい
る。このシート状の金型洗浄剤組成物による金型
洗浄は、上記シート状組成物を上下の金型間に挟
み、型閉成時の圧力によつて金型の各キヤビテイ
の表面にそれぞれ対応するシートの部分を圧接さ
せ、その状態で加熱加硫させて上記未加硫ゴム生
地全体を加硫ゴム化し、この加硫ゴム化の際に、
キヤビテイ表面の離型剤酸化劣化層を加硫ゴムに
一体化し、ついでシート状の一枚の加硫ゴムを金
型から剥離させることにより、キヤビテイ表面を
洗浄するということにより行われる。このような
金型洗浄剤組成物を使用すると、上記熱硬化性メ
ラミン樹脂成形材料を用いたときのような問題を
生じない。そして、金型のキヤビテイ表面もメラ
ミン樹脂成形材料洗浄と同様、初期の鏡面状態ま
で洗浄される。 〔発明が解決しようとする問題点〕 しかしながら、上記のような金型洗浄剤組成物
を用いたり、また熱硬化性メラミン樹脂成形材料
を用いてキヤビテイ等の表面を洗浄する場合、キ
ヤビテイ表面等の金型面が鏡面状態にまで洗浄さ
れ、金型面には離型剤が存在しなくなる。ところ
が、このように金型面が完全に洗浄化されると、
洗浄化直後の成形に際して、成形品が金型面に付
着し円滑に離型しない。これは、金型面が完全浄
化されているため、1回の成形程度では成形材料
から滲出する離型剤によつて金型面に離型剤が充
分付着しないことに起因する。そのため、上記金
型面の洗浄後、離型剤をスプレーから吹き付けた
りすること等が提案され一部で実施されている
が、このようにすると離型性は付与されるもの
の、金型面に対して離型剤の濃度差を生じ、場合
によつては、成形品の表面に上記離型剤が付着し
製品の外観を低下させたり、スプレー時に、金型
面以外に離型剤が付着し洗浄条件を著しく悪化さ
せたり、また噴霧された離型剤の吸引で作業員の
健康が害される等の問題が生じている。そのた
め、実際には、上記洗浄後、エポキシ樹脂成形材
料を5シヨツト程度成形(これをダミー成形と称
する)し、成形材料中に含まれる内部離型剤を金
型表面に充分付着させたのち、通常の成形を行う
ということがなされている。ところが、このよう
にダミーシヨツトを5シヨツトも行うことは、極
めて不経済であり、これが成形の効率低下の原因
となつている。 この発明は、このような事情に鑑みなされたも
ので、洗浄後の金型面に対する離型剤の付与を均
一に、かつ成形条件等の悪化や作業環境等の悪化
を招くことなく、しかも容易に行うことができる
離型用シートの提供をその目的とする。 〔問題点を解決するための手段〕 上記の目的を達成するため、この発明の離型用
シートは、未加硫ゴム生地を母材とし、離型剤が
含有されているという構成をとる。 すなわち、上記シートには、離型剤が含有され
ているため、これを金型面が洗浄化され鏡面化さ
れている状態の金型間に挟んで加熱加硫すること
により、未加硫ゴム生地から離型剤が滲出して金
型面に付着し、金型面に対して均一な離型剤膜を
形成するようになる。要約すれば、金型間に上記
シートを挟んで1回加熱成形し、ついでシートを
剥離するという簡単な作業により、洗浄化され鏡
面状になつている金型面に対して、均一に離型剤
膜の形成を行うことができるようになる。したが
つて、スプレー塗布のような離型剤の付与の不均
一、成形条件および作業環境の悪化等を招くこと
がない。しかも、上記作業は、極めて簡便である
ため、離型剤の付与作業の作業効率の大幅な向上
を実現しうるようになる。 この発明の離型用シートは、未加硫ゴム生地を
母材と、これに離型剤を含有させて得られるもの
であつて、両成分原料を公知の方法で混合したの
ち、シート状に加工されて得られる。 上記未加硫ゴム生地を構成する未加硫ゴムとし
ては、天然ゴム(NR)、クロロプレンゴム
(CR)、ブタジエンゴム(BR)、ニトリルゴム
(NBR)、エチレンプロピレンターポリマーゴム
(EPT)、エチレンプロピレンゴム(EPM)、ス
チレンブタジエンゴム(SBR)、ポリイソプレン
ゴム(IR)、ブチルゴム(IIR)、シリコーンゴム
(Q)、フツ素ゴム(FKM)等があげられる。未
加硫ゴム生地は、上記ゴムを単独でもしくは併用
し、これに加硫剤を配合し、必要に応じて加硫促
進剤、補強剤、着色剤等を配合して構成される。
このような未加硫ゴム生地は、金型内において加
硫され加硫ゴムとなる。上記の未加硫ゴム生地と
して好ましいのはEPT,LBR,NBRもしくはこ
れらの混合物を用いたものである。上記EPTは、
エチレン、α−オレフインおよび非共役二重結合
を有する環状または非環状からなる共重合物であ
る。これについて詳述すると、EPTは、エチレ
ン、α−オレフイン(特にプロピレン)およびポ
リエンモノマーからなるターポリマーであり、上
記ポリエンモノマーとしては、ジシクロペンタジ
エン、1,5−シクロオクタジエン、1,1−シ
クロオクタジエン、1,6−シクロドデカジエ
ン、1,7−シクロドデカジエン、1,5,9−
シクロドデカトリエン、1,4−シクロヘプタジ
エン、1,4−シクロヘキサジエン、ノルボルナ
ジエン、メチレンノルボルネン、2−メチルペン
タジエン、1,4、1,5−ヘキサジエン、1,
6−ヘプタジエン、メチル−テトラヒドロインデ
ン、1,4−ヘキサジエン等があげられる。各モ
ノーの共重合割合は、好ましくはエチレンが30〜
80モル%、ポリエンが0.1〜20モル%で残りがα
−オレフインである。より好ましいのはエチレン
が30〜60モル%のものである。そして、ムーニー
粘度ML1+4(100℃)が20〜70のものがよい。上記
EPTの具体例としては、三井石油化学工業社製、
三井EPT4021,同4045,同4070をあげることが
できる。また、前記SBRとしては、スチレン含
量が15〜30モル%でムーニー粘度ML1+4(100℃)
が20〜80、好ましくは35〜60のものが好適であ
る。具体例として、日本合成ゴム社製、JSR−
1502、同1507、同1778をあげることができる。
NBRとしては、アクリロニトリル含量が20〜60
モル%、好ましくは25〜45モル%でムーニー粘度
ML1+4(100℃)が20〜85、好ましくは30〜70のも
のを用いることが好適である。具体例として、日
本合成ゴム社製、N−234L、同230S、同230SH
をあげることができる。 上記離型剤としては、ステアリン酸、ベヘニン
酸のような長鎖脂肪酸、ステアリン酸亜鉛、ステ
アリン酸カルシウムで代表される長鎖脂肪酸の金
属塩、カルナバワツクス、モンタンワツクス、モ
ンタン酸の部分ケン化エステルで代表されるエス
テル系ワツクス、ステアリルエチレンジアミドで
代表される長鎖脂肪酸アミド、ポリエチレンワツ
クスに代表されるパラフイン類等があげられる。 この発明の離型用シートは、上記離型剤と上記
未加硫ゴムとを公知の方法、例えばカレンダーロ
ール等を用いて混合することによつて得ることが
でき、また、予め未加硫ゴム生地をつくり、これ
に離型剤を練り込む等の方法によつても得ること
ができる。これらの場合、離型剤は、未加硫ゴム
生地100重量部(以下「部」と略す)に対して、
通常、1〜50部配合される。好ましいのは3〜20
部である。そして、上記離型剤としては、その融
点が200℃以下、また沸点が200℃以上であるもの
が好ましい。さらに、好ましいのは融点が50〜
150℃のものである。すなわち、金型成形は、通
常、150〜200℃で行われるのであり、上記離型剤
の融点が200℃より大きければ、金型面に滲出せ
ず、また、沸点が200℃未満であれば、金型に滲
出しても蒸発してしまうために機能を果たさなく
なる傾向がみられるからである。 なお、この発明の離型用シートには、補強剤と
してシリカ、アルミナ、炭酸カルシウム、水酸化
アルミニウム、酸化チタン等の無機質補強剤(充
填剤)を配合することも可能である。この場合、
補強剤の使用量は、未加硫ゴム生地100部に対し
10〜50部に設定することが好適である。また、金
型洗浄用シートの離型用シートの使い分けのため
には、上記2種類のシートを色分けしておくこと
が好適である。 〔発明の効果〕 この発明の離型用シートは、以上のように構成
されているため、単に、金型間に挟んで加熱加硫
したのち、金型から取り出すということにより、
金型面に対して均一に離型剤を付着させることが
できるようになる。したがつて、これを用いるこ
とにより従来のように、金型洗浄後、5シヨツト
ものダミーシヨツトを行う必要がなくなり極めて
経済的である。また、スプレーを用いて離型剤を
塗布する場合に比べて、作業の容易化を達成しう
るばかりでなく、成形条件、作業環境の悪化を招
かず、しかも離型剤の均一付与を実現しうるとい
う利点を備えている。 つぎに、実施例について比較例と併せて詳しく
説明する。 〔実施例 1〕 エチレンプロピレンターポリマーゴム(EPT,
三井石油化学工業社製、三井EPT4045)100部、
シリカパウダー20部、酸化チタン5部、有機過酸
化物4部およびカルナバワツクス20部を配合し、
これを圧延ロールを用いて厚み7mmのシート状に
形成し、目的とする離型用シートを得た。 〔実施例 2〕 カルナバワツクスの使用割合を3部に減少し
た。それ以外は、実施例1と同様にして離型用シ
ートを得た。 〔実施例 3〕 カルナバワツクスの使用割合を50部に増加し
た。それ以外は実施例1と同様にして離型用シー
トを得た。 〔実施例 4〕 カルナバワツクスに代えて、ステアリン酸亜鉛
(日本油脂化学社製、ジンクステアレートD)を
用いた。それ以外は、実施例1と同様にして離型
用シートを得た。 〔実施例 5〕 スチレンブタジエンゴム(SBR、日本合成ゴ
ム社製、JSR−1502)100部、シリカパウダー20
部、水酸化アルミニウム15部、有機過酸化物4部
およびカルナバワツクス20部を用い、実施例1と
同様にして離型用シートを得た。 〔実施例 6〕 ニトリルゴム(NBR、日本合成ゴム社製、N
−230SH)100部、シリカパウダー20部、酸化チ
タン5部、有機過酸化物4部およびカルナバワツ
クス20部を用い、実施例1と同様にして離型用シ
ートを得た。 〔実施例 7〕 カルナバワツクスを単独で用いるのではなく、
実施例4で用いたスアリン酸亜鉛と併用(10:
10)した。それ以外は、実施例1と同様にして離
型用シートを得た。 〔比較例 1〕 ダミーシヨツト用の熱硬化性樹脂としてエポキ
シ樹脂成形材料(日東電工社製、MP−10)を用
いた。 以上の実施例で得られた離型用シートを、金型
洗浄の終了した熱硬化性樹脂成形用金型に挟み、
175℃で4分間加硫し、加硫後ただちに金型を開
いて、成形された加硫ゴムを取り出した。その
後、上記のようにして離型剤の付与された金型を
用い、通常の成形方法で、熱硬化性樹脂成形材料
エポキシ樹脂成形材料(日東電工社製、表にまと
めて示した。MP−10)を成形し、成形品の離型
状態を調べ、その結果を比較例1の結果(ダミー
シヨツト1回)と併せて後記の表に示した。
[Industrial Application Field] The present invention relates to a mold release sheet used for smoothly releasing a molded article from a molding die for a thermosetting resin molding material. [Prior art] When molding a thermosetting resin molding material such as an epoxy resin molding material, the mold release agent contained in the thermosetting resin molding material oozes onto the surface of the cavity, which is the molding space of the mold. Demonstrates mold release effect. If such molding is repeated many times, the releasability of the molded product will be significantly deteriorated, the surface of the molded product will become rough, and the surface of the molded product will lack gloss. The reason for this is thought to be that the mold release agent contained in the forming material is sequentially laminated on the surface of the cavity through repeated molding, and is gradually oxidized and deteriorated to form a hard oxidation-degraded layer of mold release agent. That is, the oxidation-degraded layer of the mold release agent does not have a smooth surface and does not have a mold release effect, which causes the above-mentioned problems. For this reason, conventionally, a melamine resin molding material different from the above-mentioned epoxy resin molding material was put into the cavity.
After molding, the product is heated and cured, and the oxidation-degraded layer of the mold release agent is integrally attached to the cured product.The surface of the cavity is cleaned by removing the cured product from the mold cavity in this state. . However, when doing this, it is necessary to separately fill the many cavities in the mold with melamine resin molding material and take out the cured material, which is extremely complicated. A problem has arisen in that the working environment is significantly deteriorated due to odors generated from the materials. Therefore, the present inventors have recently developed a sheet-shaped mold cleaning agent composition that uses unvulcanized rubber fabric as a base material and contains glycol ethers in the base material, and has already applied for a patent (patent application). (Sho 61-252536). Mold cleaning with this sheet-shaped mold cleaning agent composition involves sandwiching the sheet-shaped composition between upper and lower molds, and applying pressure when closing the mold to the surface of each cavity of the mold. The parts of the sheet are pressed together and heated and vulcanized in that state to turn the entire unvulcanized rubber fabric into vulcanized rubber, and during this vulcanization,
This is carried out by integrating the oxidation-degraded layer of the mold release agent on the surface of the cavity with the vulcanized rubber, and then peeling off the sheet-like vulcanized rubber from the mold to clean the surface of the cavity. When such a mold cleaning agent composition is used, the problems that occur when the thermosetting melamine resin molding material is used do not occur. The cavity surface of the mold is also cleaned to its initial mirror-like state, similar to the cleaning of the melamine resin molding material. [Problems to be Solved by the Invention] However, when cleaning the surfaces of cavities, etc. using the above mold cleaning composition or using thermosetting melamine resin molding materials, the surfaces of cavities, etc. The mold surface is cleaned to a mirror-like state, and no mold release agent is present on the mold surface. However, when the mold surface is completely cleaned like this,
When molding immediately after cleaning, the molded product adheres to the mold surface and cannot be released smoothly. This is because the mold surface is completely cleaned, so the mold release agent oozes from the molding material and does not adhere to the mold surface sufficiently after one molding. For this reason, spraying a mold release agent after cleaning the mold surface has been proposed and has been carried out in some cases, but although this method provides mold releasability, it does not affect the mold surface. However, there may be a difference in the concentration of the mold release agent, and in some cases, the mold release agent may adhere to the surface of the molded product, deteriorating the appearance of the product, or the mold release agent may adhere to areas other than the mold surface during spraying. This poses problems such as significantly worsening cleaning conditions and harming the health of workers due to inhalation of the sprayed mold release agent. Therefore, in reality, after the above-mentioned cleaning, about 5 shots of the epoxy resin molding material are molded (this is called dummy molding), and the internal mold release agent contained in the molding material is sufficiently adhered to the mold surface. Normal molding is performed. However, performing five dummy shots in this manner is extremely uneconomical, and this is a cause of a decrease in molding efficiency. This invention was made in view of the above circumstances, and it is possible to uniformly apply a mold release agent to the mold surface after cleaning, without causing deterioration of molding conditions, etc. or deterioration of the working environment, etc., and easily. The purpose is to provide a mold release sheet that can be used for various purposes. [Means for Solving the Problems] In order to achieve the above object, the release sheet of the present invention uses an unvulcanized rubber fabric as a base material and contains a release agent. In other words, since the above-mentioned sheet contains a mold release agent, it is sandwiched between molds whose mold surfaces have been cleaned and mirror-finished, and heated and vulcanized to form unvulcanized rubber. The release agent exudes from the dough and adheres to the mold surface, forming a uniform release agent film on the mold surface. In summary, by the simple operation of sandwiching the above sheet between molds, heating and molding once, and then peeling off the sheet, the mold can be released uniformly from the cleaned and mirror-like surface of the mold. It becomes possible to form a drug film. Therefore, uneven application of a mold release agent and deterioration of molding conditions and working environment, etc., as in the case of spray coating, are not caused. Moreover, since the above-mentioned operation is extremely simple, it becomes possible to realize a significant improvement in the efficiency of the operation of applying the mold release agent. The mold release sheet of this invention is obtained by containing an unvulcanized rubber base material and a mold release agent therein, and after mixing both raw materials by a known method, it is formed into a sheet. Obtained by processing. The unvulcanized rubber that makes up the above unvulcanized rubber fabric includes natural rubber (NR), chloroprene rubber (CR), butadiene rubber (BR), nitrile rubber (NBR), ethylene propylene terpolymer rubber (EPT), and ethylene. Examples include propylene rubber (EPM), styrene butadiene rubber (SBR), polyisoprene rubber (IR), butyl rubber (IIR), silicone rubber (Q), and fluorine rubber (FKM). The unvulcanized rubber fabric is made by using the above-mentioned rubbers alone or in combination, blending a vulcanizing agent therein, and blending a vulcanization accelerator, a reinforcing agent, a coloring agent, etc. as necessary.
Such unvulcanized rubber dough is vulcanized in a mold to become vulcanized rubber. The above-mentioned unvulcanized rubber fabric is preferably made of EPT, LBR, NBR or a mixture thereof. The above EPT is
It is a copolymer consisting of ethylene, α-olefin, and a cyclic or acyclic polymer having a nonconjugated double bond. To elaborate on this, EPT is a terpolymer consisting of ethylene, α-olefin (especially propylene) and polyene monomers, and the polyene monomers include dicyclopentadiene, 1,5-cyclooctadiene, 1,1- Cyclooctadiene, 1,6-cyclododecadiene, 1,7-cyclododecadiene, 1,5,9-
Cyclododecatriene, 1,4-cycloheptadiene, 1,4-cyclohexadiene, norbornadiene, methylenenorbornene, 2-methylpentadiene, 1,4,1,5-hexadiene, 1,
Examples include 6-heptadiene, methyl-tetrahydroindene, 1,4-hexadiene, and the like. The copolymerization ratio of each monomer is preferably 30 to 30% of ethylene.
80 mol%, polyene 0.1-20 mol% and the rest α
- It is an olefin. More preferred is one containing 30 to 60 mol% of ethylene. The Mooney viscosity ML 1+4 (100°C) is preferably 20 to 70. the above
Specific examples of EPT include those manufactured by Mitsui Petrochemical Industries, Ltd.
Mitsui EPT4021, Mitsui 4045, and Mitsui 4070 can be cited. In addition, the SBR has a styrene content of 15 to 30 mol% and a Mooney viscosity of ML 1+4 (100℃).
is preferably 20 to 80, preferably 35 to 60. As a specific example, JSR- manufactured by Japan Synthetic Rubber Co., Ltd.
I can list 1502, 1507, and 1778.
As NBR, acrylonitrile content is 20-60
Mooney viscosity in mol%, preferably 25-45 mol%
It is suitable to use one having an ML 1+4 (100°C) of 20 to 85, preferably 30 to 70. Specific examples include N-234L, 230S, and 230SH manufactured by Japan Synthetic Rubber Co., Ltd.
can be given. The above mold release agents include long chain fatty acids such as stearic acid and behenic acid, metal salts of long chain fatty acids such as zinc stearate and calcium stearate, carnauba wax, montan wax, and partially saponified montan acid. Examples include ester-based waxes represented by esters, long-chain fatty acid amides represented by stearyl ethylene diamide, and paraffins represented by polyethylene waxes. The release sheet of the present invention can be obtained by mixing the above-mentioned release agent and the above-mentioned unvulcanized rubber using a known method, for example, using a calendar roll. It can also be obtained by a method such as making a dough and kneading a mold release agent into it. In these cases, the release agent should be added to 100 parts by weight (hereinafter referred to as "parts") of the unvulcanized rubber dough.
Usually, 1 to 50 parts are mixed. Preferably 3-20
Department. The above mold release agent preferably has a melting point of 200°C or lower and a boiling point of 200°C or higher. Furthermore, it is preferable that the melting point is 50~
It is at 150℃. In other words, mold molding is usually performed at 150 to 200°C, so if the melting point of the mold release agent is higher than 200°C, it will not ooze out onto the mold surface, and if the boiling point is lower than 200°C, it will not ooze out onto the mold surface. This is because even if it oozes into the mold, it evaporates and tends to no longer function. The release sheet of the present invention may also contain an inorganic reinforcing agent (filler) such as silica, alumina, calcium carbonate, aluminum hydroxide, titanium oxide, etc. as a reinforcing agent. in this case,
The amount of reinforcing agent used is per 100 parts of unvulcanized rubber fabric.
It is preferable to set the volume to 10 to 50 copies. Further, in order to use the mold cleaning sheet and the mold release sheet differently, it is preferable to color-code the two types of sheets. [Effects of the Invention] Since the mold release sheet of the present invention is configured as described above, it can be easily removed from the mold by simply sandwiching it between molds, heating and vulcanizing it, and then taking it out from the mold.
The mold release agent can be applied uniformly to the mold surface. Therefore, by using this method, there is no need to perform as many as five dummy shots after cleaning the mold as in the conventional method, which is extremely economical. In addition, compared to applying a mold release agent using a spray, it not only makes the work easier, it does not cause deterioration of the molding conditions or work environment, and it also enables uniform application of the mold release agent. It has the advantage of being flexible. Next, examples will be described in detail together with comparative examples. [Example 1] Ethylene propylene terpolymer rubber (EPT,
Mitsui Petrochemical Industries, Ltd., Mitsui EPT4045) 100 copies,
Contains 20 parts of silica powder, 5 parts of titanium oxide, 4 parts of organic peroxide, and 20 parts of carnauba wax.
This was formed into a sheet with a thickness of 7 mm using a rolling roll to obtain the intended release sheet. [Example 2] The proportion of carnauba wax used was reduced to 3 parts. A release sheet was obtained in the same manner as in Example 1 except for the above. [Example 3] The proportion of carnauba wax used was increased to 50 parts. A release sheet was obtained in the same manner as in Example 1 except for the above. [Example 4] Zinc stearate (manufactured by Nihon Yushi Chemical Co., Ltd., Zinc Stearate D) was used in place of carnauba wax. A release sheet was obtained in the same manner as in Example 1 except for the above. [Example 5] 100 parts of styrene butadiene rubber (SBR, manufactured by Japan Synthetic Rubber Co., Ltd., JSR-1502), 20 parts of silica powder
A release sheet was obtained in the same manner as in Example 1 using 15 parts of aluminum hydroxide, 4 parts of organic peroxide, and 20 parts of carnauba wax. [Example 6] Nitrile rubber (NBR, manufactured by Japan Synthetic Rubber Co., Ltd., N
-230SH), 20 parts of silica powder, 5 parts of titanium oxide, 4 parts of organic peroxide, and 20 parts of carnauba wax, a release sheet was obtained in the same manner as in Example 1. [Example 7] Instead of using carnauba wax alone,
Used in combination with zinc suarate used in Example 4 (10:
10) I did. A release sheet was obtained in the same manner as in Example 1 except for the above. [Comparative Example 1] An epoxy resin molding material (manufactured by Nitto Denko Corporation, MP-10) was used as a thermosetting resin for the dummy shot. The mold release sheet obtained in the above example was sandwiched between thermosetting resin molding molds that had been cleaned,
Vulcanization was performed at 175° C. for 4 minutes, and immediately after vulcanization, the mold was opened and the molded vulcanized rubber was taken out. Thereafter, using the mold to which the release agent was applied as described above, a thermosetting resin molding material epoxy resin molding material (manufactured by Nitto Denko Corporation, summarized in the table below) was applied by a normal molding method.MP- 10) was molded and the release state of the molded product was examined, and the results are shown in the table below together with the results of Comparative Example 1 (one dummy shot).

【表】 上記の表から明らかなように、実施例によれ
ば、比較例に比べて、極めて良好な離型性を付与
しうることがわかる。
[Table] As is clear from the above table, it can be seen that the examples can provide extremely good mold releasability compared to the comparative examples.

Claims (1)

【特許請求の範囲】 1 未加硫ゴム生地を母材とし、離型剤が含有さ
れていることを特徴とする離型用シート。 2 離型剤が、未加硫ゴム生地100重量部に対し
て1〜50重量部含有されている特許請求の範囲第
1項記載の離型用シート。
[Scope of Claims] 1. A release sheet characterized by having an unvulcanized rubber fabric as a base material and containing a release agent. 2. The release sheet according to claim 1, wherein the release agent is contained in an amount of 1 to 50 parts by weight based on 100 parts by weight of the unvulcanized rubber dough.
JP61313560A 1986-12-23 1986-12-23 Sheet for release Granted JPS63159019A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
JP61313560A JPS63159019A (en) 1986-12-23 1986-12-23 Sheet for release
MYPI87003233A MY101701A (en) 1986-12-23 1987-12-21 Mold-releasing sheet and method for applying mold- releasing agent onto mold surface using said sheet.
DE8787119049T DE3778667D1 (en) 1986-12-23 1987-12-22 SHEET WITH RELEASE AGENT FOR HOLLOW SHAPES AND METHOD FOR FEEDING THE RELEASE AGENT ON THE SURFACE OF A HOLLOW SHAPE WITH THIS SHEET.
EP87119049A EP0272685B1 (en) 1986-12-23 1987-12-22 Mold-releasing sheet and method for applying mold-releasing agent onto mold surface using said sheet
PH36286A PH25385A (en) 1986-12-23 1987-12-22 Mold-releasing sheet, method for applying mold-releasing agent
KR1019870014790A KR950013276B1 (en) 1986-12-23 1987-12-23 Mold-releasing sheet and method for applying mold-releasing agent onto mold surface using said sheet
US07/268,674 US4956132A (en) 1986-12-23 1988-11-07 Method for applying mold-releasing agent onto mold surfaces using a mold-releasing sheet
SG109494A SG109494G (en) 1986-12-23 1994-08-08 Mold-releasing sheet and method for applying mold-releasing agent onto mold surface using said sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61313560A JPS63159019A (en) 1986-12-23 1986-12-23 Sheet for release

Publications (2)

Publication Number Publication Date
JPS63159019A JPS63159019A (en) 1988-07-01
JPH0564562B2 true JPH0564562B2 (en) 1993-09-14

Family

ID=18042780

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61313560A Granted JPS63159019A (en) 1986-12-23 1986-12-23 Sheet for release

Country Status (1)

Country Link
JP (1) JPS63159019A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5726517B2 (en) * 2008-03-31 2015-06-03 日本カーバイド工業株式会社 Rubber composition for mold release recovery
JP5737122B2 (en) * 2011-10-11 2015-06-17 日立化成株式会社 Mold release recovery sheet and mold release processing method using the same
JP6289203B2 (en) * 2014-03-27 2018-03-07 日本カーバイド工業株式会社 Mold release recovery resin composition and mold release recovery method using the same

Also Published As

Publication number Publication date
JPS63159019A (en) 1988-07-01

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