JP3463608B2 - Manufacturing method of thermosetting resin molded products - Google Patents
Manufacturing method of thermosetting resin molded productsInfo
- Publication number
- JP3463608B2 JP3463608B2 JP16171499A JP16171499A JP3463608B2 JP 3463608 B2 JP3463608 B2 JP 3463608B2 JP 16171499 A JP16171499 A JP 16171499A JP 16171499 A JP16171499 A JP 16171499A JP 3463608 B2 JP3463608 B2 JP 3463608B2
- Authority
- JP
- Japan
- Prior art keywords
- thermosetting resin
- core material
- mold
- curing
- resin
- 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 - Fee Related
Links
Landscapes
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、不飽和ポリエス
テル樹脂、エポキシ樹脂、ウレタン樹脂、ジアリルフタ
レート樹脂などの熱硬化性樹脂からなる成形品の製法に
関し、熱硬化性樹脂の硬化に伴う体積収縮に起因して生
じる成形品表面のヒケ（凹部）の発生を防止するように
したものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a molded article made of a thermosetting resin such as an unsaturated polyester resin, an epoxy resin, a urethane resin, a diallyl phthalate resin. This is intended to prevent the occurrence of sink marks (recesses) on the surface of the molded product.
【０００２】[0002]
【従来の技術】この種の熱硬化性樹脂は、その硬化時の
体積収縮が比較的大きく、例えば不飽和ポリエステル樹
脂では７％にも達する。このため、注型法で成形品を成
形すると、体積収縮に起因して「ヒケ」が発生し、成形
品表面に凹状の欠陥が生じ、不良品が生じる。このよう
な問題点を解決するものとして、成形途中で金型を加圧
し、硬化による体積減少に応じて金型の成形空間（キャ
ビティ）の体積を減少させる方法が提案されている。2. Description of the Related Art A thermosetting resin of this type has a relatively large volume shrinkage upon curing, and for example, an unsaturated polyester resin reaches 7%. Therefore, when a molded product is molded by the casting method, "sink" is generated due to the volume shrinkage, a concave defect is generated on the surface of the molded product, and a defective product is generated. As a method for solving such a problem, a method has been proposed in which a mold is pressed during molding to reduce the volume of a molding space (cavity) of the mold in accordance with the volume reduction due to curing.
【０００３】しかしながら、この成形法では加圧装置が
必要となり、また、金型の成形面が曲面形状のもので
は、金型全面に均一に作用せず、ヒケを完全に防止する
ことは不可能であった。However, this molding method requires a pressurizing device, and if the molding surface of the mold is a curved surface, it does not act uniformly on the entire surface of the mold and it is impossible to completely prevent sink marks. Met.
【０００４】[0004]
【発明が解決しようとする課題】よって、本発明におけ
る課題は、熱硬化性樹脂を注型法によって成形する際
に、成形品の表面にヒケが生じないようにすることにあ
る。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to prevent sink marks from being generated on the surface of a molded product when the thermosetting resin is molded by a casting method.
【０００５】[0005]
【課題を解決するための手段】かかる課題を解決するた
め、請求項１にかかる発明は、金型内に予め中芯材を配
置し、ついでこの金型内の中芯材の周囲に熱硬化性樹脂
液を注入し、金型を加熱して熱硬化性樹脂を硬化する際
に、上記熱硬化性樹脂の硬化収縮体積量に見合った体積
膨張量を中芯材に生起せしめるとともに、中芯材の膨張
と熱硬化性樹脂の硬化収縮とを同期させることを特徴と
する熱硬化性樹脂成形品の製法である。請求項２にかか
る発明は、金型内に予め中芯材を配置し、ついでこの金
型内の中芯材の周囲に熱硬化性樹脂液を注入し、金型を
加熱して熱硬化性樹脂を硬化する際に、硬化開始時から
硬化完了までの時間内に、常時上記熱硬化性樹脂の硬化
収縮体積量より大きい体積膨張量を中芯材に生起せしめ
ることを特徴とする熱硬化性樹脂成形品の製法である。
請求項３にかかる発明は中芯材が熱硬化性樹脂成形品の
一部を構成するものであることを特徴とする請求項１ま
たは２記載の熱硬化性樹脂成形品の製法である。 [Means for Solving the Problems ]
Therefore, in the invention according to claim 1, the core material is previously arranged in the mold.
Place the thermosetting resin around the core in the mold.
When injecting liquid and heating the mold to cure the thermosetting resin
In addition, the volume corresponding to the curing shrinkage volume of the thermosetting resin
In addition to causing the amount of expansion in the core material, the expansion of the core material
And the shrinkage of the thermosetting resin are synchronized.
It is a method for producing a thermosetting resin molded product. Or claim 2
In the invention, the core material is placed in advance in the mold, and then
Inject the thermosetting resin liquid around the core material in the mold and open the mold.
When curing the thermosetting resin by heating, from the beginning of curing
The thermosetting resin is always cured within the time required to complete the curing.
Produces a volume expansion amount greater than the contraction volume amount in the core material
It is a method for producing a thermosetting resin molded product characterized by the following.
In the invention according to claim 3, the core material is a thermosetting resin molded product.
Claim 1 characterized by the fact that it constitutes a part.
Or the method for producing a thermosetting resin molded article described in 2.
【０００６】[0006]
【発明の実施の形態】以下、本発明を詳しく説明する。
図１および図２は、本発明の製法の一例を説明するため
のもので、成形品として円柱状またはドーナツ状のもの
を製造する例を示すものである。図において、符号１は
成形用の金型を指し、この金型１は二つ割り構造となっ
ており、その内部には、成形空間となるキャビティ２が
形成されている。BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.
1 and 2 are for explaining an example of the manufacturing method of the present invention, and show an example of manufacturing a cylindrical or donut-shaped molded product. In the figure, reference numeral 1 indicates a molding die, and the die 1 has a split structure, and a cavity 2 serving as a molding space is formed therein.
【０００７】この金型１のキャビティ２内には、まず円
柱状またはドーナツ状の中芯材３が配置される。この中
芯材３は、後工程でキャビティ２に注入される熱硬化性
樹脂と一体化して成形品の一部を構成するもので、具体
的にはエポキシ樹脂、発泡ウレタン樹脂、ＰＰＳ樹脂
（ポリフェニレンスルフィド）、ポリカーボネート樹
脂、ＡＢＳ樹脂などの樹脂材料からなるものが用いら
れ、その形状は成形品の形状に左右される。また、この
中芯材３では、仕上がり成形品の体積の約７０〜９９％
を占めるようにその寸法を定めることが好ましい。キャ
ビティ２内の中芯材３の取付は、金型１内に設けた係止
ピンなどを用いて行われる。In the cavity 2 of the mold 1, first, a cylindrical or donut-shaped core material 3 is arranged. The core material 3 forms a part of a molded product by being integrated with a thermosetting resin that is injected into the cavity 2 in a later step, and specifically includes an epoxy resin, a urethane foam resin, and a PPS resin (polyphenylene). A resin material such as a sulfide), a polycarbonate resin, or an ABS resin is used, and its shape depends on the shape of the molded product. In addition, with this core material 3, about 70 to 99% of the volume of the finished molded product is obtained.
It is preferred to dimension it so that The attachment of the core material 3 in the cavity 2 is performed using a locking pin or the like provided in the mold 1.
【０００８】次に、金型１を閉じ、図２に示すようにそ
のゲート４から未硬化状態の熱硬化性樹脂液５を注入
し、キャビティ２内に充填する。ここで用いられる熱硬
化性樹脂としては、不飽和ポリエステル樹脂、ウレタン
樹脂、エポキシ樹脂、ジアリルフタレート樹脂である。
これらの熱硬化性樹脂は、いずれも硬化剤、硬化促進剤
等が配合されて用いられるものであり、硬化剤、硬化促
進剤等の種類、配合量を適宜変化させて、後述するよう
に必要な硬化速度、硬化温度が得られるようにすること
が重要である。Next, the mold 1 is closed, and as shown in FIG. 2, the thermosetting resin liquid 5 in an uncured state is injected from the gate 4 to fill the cavity 2. The thermosetting resin used here is unsaturated polyester resin, urethane resin, epoxy resin, diallyl phthalate resin.
These thermosetting resins are used by being mixed with a curing agent, a curing accelerator, etc., and are necessary as described below by appropriately changing the type and the amount of the curing agent, the curing accelerator, etc. It is important to obtain a proper curing speed and curing temperature.
【０００９】熱硬化性樹脂液５の充填が終了すると、金
型１に内蔵された加熱ヒータ６，６…によって金型１を
加熱し、これにより熱硬化性樹脂液５を加熱、硬化させ
て、中芯材３と熱硬化性樹脂とが一体となった成形品が
得られる。この硬化過程においては、後述するようにキ
ャビティ２内の中芯材３および熱硬化性樹脂液５の温度
を左右する金型温度、特に金型昇温速度、加熱到達温度
を制御することが重要である。熱硬化性樹脂の硬化が完
了したならば、金型１を冷却し、型開きをして成形品を
取り出す。When the filling of the thermosetting resin liquid 5 is completed, the mold 1 is heated by the heaters 6, 6 ... Built in the mold 1, whereby the thermosetting resin liquid 5 is heated and cured. A molded product in which the core material 3 and the thermosetting resin are integrated is obtained. In this curing process, it is important to control the mold temperature that influences the temperatures of the core material 3 and the thermosetting resin liquid 5 in the cavity 2, especially the mold temperature rising rate and the heating reached temperature, as described later. Is. When the curing of the thermosetting resin is completed, the mold 1 is cooled, the mold is opened, and the molded product is taken out.
【００１０】本発明の製法では、以上の操作における硬
化開始から硬化完了までの際に、熱硬化性樹脂の硬化に
伴って生じる体積収縮量に対して、この体積収縮量に等
しいかもしくは若干これよりも大きな体積膨張を中芯材
３に発生させる。熱硬化性樹脂の硬化による体積収縮量
は、樹脂の種類によって異なるが、硬化温度、硬化速度
には依存しない。したがって、キャビティ２内に充填さ
れる熱硬化性樹脂液５の体積が定まれば、その収縮体積
量は算出して求められる。In the production method of the present invention, the amount of volume shrinkage that occurs with the curing of the thermosetting resin during the period from the initiation of curing to the completion of curing in the above operation is equal to or slightly greater than this amount of volume shrinkage. A larger volume expansion is generated in the core material 3. The volume shrinkage of the thermosetting resin due to curing varies depending on the type of resin, but does not depend on the curing temperature or the curing speed. Therefore, if the volume of the thermosetting resin liquid 5 filled in the cavity 2 is determined, the shrinkage volume thereof can be calculated and obtained.
【００１１】一方、中芯材３の体積膨張は、中芯材３を
なす材料およびその温度によって定まる。したがって、
中芯材３に求められる体積膨張量を得るには、その材料
の選定と金型１内での到達温度を定めれば算出すること
ができる。On the other hand, the volume expansion of the core material 3 is determined by the material forming the core material 3 and its temperature. Therefore,
The volume expansion amount required for the core material 3 can be calculated by selecting the material and determining the temperature reached in the mold 1.
【００１２】しかし、成形品のヒケを確実に防止するに
は、熱硬化性樹脂の硬化が完了した時点での体積収縮量
を中芯材３の体積膨張量で補うだけでは不十分である。
すなわち、図３に示すように、熱硬化性樹脂の硬化開始
から硬化完了までの期間中、常にその体積収縮量の増大
に見合う量の中芯材３の体積膨張量が必要となり、硬化
開始から完了までの一連の時間の中で、常時熱硬化性樹
脂の硬化による体積収縮量より大きい体積膨張量を中芯
材３が発生することが必要となる。However, in order to surely prevent the sink mark of the molded product, it is not enough to compensate the volume shrinkage amount at the time when the curing of the thermosetting resin is completed with the volume expansion amount of the core material 3.
That is, as shown in FIG. 3, during the period from the start of curing of the thermosetting resin to the completion of curing, an amount of volume expansion of the core material 3 that is commensurate with the increase in the amount of volume shrinkage is always required. It is necessary that the core material 3 always generate a volume expansion amount larger than the volume contraction amount due to the curing of the thermosetting resin in the series of time until completion.
【００１３】以上の２つの条件を満たすには、第１に中
芯材３の材料の選定と、第２に熱硬化性樹脂液５の硬化
速度、硬化温度を規定する配合組成と、第３に中芯材３
の温度および熱硬化性樹脂の温度を規定する金型１の昇
温速度、到達温度の設定とが必要となる。これらの三者
の適切な組み合わせを選定することで、成形品のヒケを
完全に防止できる。In order to satisfy the above two conditions, firstly, the material of the core material 3 is selected, secondly, the curing composition of the thermosetting resin liquid 5 and the compounding composition which regulates the curing temperature, and thirdly. To core material 3
It is necessary to set the rate of temperature rise and the ultimate temperature of the mold 1 that regulate the temperature of 1 and the temperature of the thermosetting resin. By selecting an appropriate combination of these three, it is possible to completely prevent sinking of the molded product.
【００１４】この適切な組み合わせは、予備成形試験に
よって求められる。また、おおまかには、硬化収縮量の
大きな熱硬化性樹脂、例えば不飽和ポリエステル樹脂に
は、線膨張係数の大きな樹脂、例えばＡＢＳ樹脂、ポリ
カーボネート樹脂などからなる中芯材を組み合わせる方
法や、線膨張係数の小さな樹脂、例えばＰＰＳ樹脂、発
泡ポリウレタン樹脂などからなる中芯材３を用いる場合
には、熱硬化性樹脂としては硬化速度が遅く、硬化温度
が高い配合組成を有するものを用い、金型到達温度を高
く設定する方法などがある。This suitable combination is determined by preforming tests. In general, a thermosetting resin having a large amount of curing shrinkage, for example, an unsaturated polyester resin, is combined with a resin having a large linear expansion coefficient, for example, a core material made of an ABS resin, a polycarbonate resin, or the like, or a linear expansion method. When the core material 3 made of a resin having a small coefficient, such as a PPS resin or a polyurethane foam resin, is used, a thermosetting resin having a compounding composition with a slow curing rate and a high curing temperature is used. There is a method of setting the ultimate temperature high.
【００１５】以下に、具体的な中芯材３、熱硬化性樹脂
の配合、金型温度（到達温度）の組み合わせと成形品の
ヒケの発生状態を示す。
（１）中芯材
材料名 線膨張係数（／℃）
エポキシ樹脂 ４×１０-5
発泡ウレタン樹脂 ３×１０-5
ＰＰＳ樹脂 ２×１０-5
ポリカーボネート樹脂 ７×１０-5
ＡＢＳ樹脂 ８×１０-5 The specific combinations of the core material 3, the thermosetting resin, the mold temperature (achieved temperature), and the sinking state of the molded product are shown below. (1) the central core material name linear expansion coefficient (/ ° C.) Epoxy resin 4 × 10 -5 urethane foam resin 3 × 10 -5 PPS resin 2 × 10 -5 polycarbonate resin 7 × 10 -5 ABS resin 8 × 10 - Five
【００１６】 （２）熱硬化性樹脂の配合、硬化収縮率 不飽和ポリエステル樹脂 不飽和ポリエステル １００重量部 メチルエチルケトンパーオキサイド ０．５〜１．５重量部 （活性酸素量１０．０〜１０．５％） ナフテン酸コバルト ０．５重量部 （コバルト質量換算６％） エステル系反応促進剤 ０．２〜０．４重量部 体積収縮率 ７％ ウレタン樹脂 ポリエーテル １００重量部 イソシアネート １０〜５０重量部 体積収縮率 ６．０％ エポキシ樹脂 エポキシ樹脂 １００重量部 アミン系硬化剤 ３０重量部 体積収縮率 ４．５％[0016] (2) Thermosetting resin composition, cure shrinkage Unsaturated polyester resin 100 parts by weight of unsaturated polyester Methyl ethyl ketone peroxide 0.5-1.5 parts by weight (Amount of active oxygen 10.0-10.5%) Cobalt naphthenate 0.5 parts by weight (Cobalt mass conversion 6%) Ester-based reaction accelerator 0.2 to 0.4 parts by weight Volume contraction rate 7% Urethane resin 100 parts by weight of polyether Isocyanate 10 to 50 parts by weight Volume shrinkage rate 6.0% Epoxy resin Epoxy resin 100 parts by weight Amine curing agent 30 parts by weight Volume shrinkage rate 4.5%
【００１７】表１に、これら中芯材と熱硬化性樹脂とを
組み合わせ、金型温度を変化させて成形を行った際の成
形品表面のヒケの発生状況を示した。表１中、○は、表
面ヒケをその深さの樹脂層厚に対する百分率で表したと
き、０〜０．５％のものを指し、△は同じく０．５〜２
％のものを、×は２％を越えるものを指す。Table 1 shows the occurrence of sink marks on the surface of the molded product when these core materials and thermosetting resins were combined and molding was performed while changing the mold temperature. In Table 1, ∘ indicates 0 to 0.5% when the surface sink mark is expressed as a percentage of the depth to the resin layer thickness, and Δ indicates 0.5 to 2 similarly.
%, And x means more than 2%.
【００１８】[0018]
【表１】 [Table 1]
【００１９】表１の結果から明らかなように、熱膨張率
の小さい材料からなる中芯材と硬化収縮率の大きい熱硬
化性樹脂とを組み合わせる場合には、金型到達温度を十
分高くすることが必要であり、熱膨張率の大きな材料か
らなる中芯材であれば、熱硬化性樹脂の硬化収縮率とは
さほど関係なく、金型到達温度を低くしてもヒケの発生
がないことがわかる。As is clear from the results shown in Table 1, when the core material made of a material having a small thermal expansion coefficient and the thermosetting resin having a large curing shrinkage rate are combined, the temperature reached by the mold should be sufficiently high. If it is a core material made of a material having a large coefficient of thermal expansion, it does not have a sink mark even if the temperature reached by the mold is lowered, regardless of the curing shrinkage rate of the thermosetting resin. Recognize.
【００２０】このような熱硬化性樹脂の成形法にあって
は、熱硬化性樹脂の成形時に発生する硬化収縮体積量と
同等もしくはこれ以上の体積を中芯材３の加熱による膨
張によって、硬化開始から硬化終了までの間常時補うよ
うにしているので、熱硬化性樹脂成形品の表面のヒケを
生じることがなく、表面仕上がりの良好な成形品が製造
できる。In such a thermosetting resin molding method, a volume equal to or larger than the curing shrinkage volume generated during molding of the thermosetting resin is cured by expansion of the core material 3 by heating. Since it is always supplemented from the start to the end of curing, the surface of the thermosetting resin molded product is not sinked and a molded product having a good surface finish can be manufactured.
【００２１】以下、具体例を示すが、本発明はこれら具
体例に限定されるものではない。特に、中芯材に選択す
る樹脂はその配合により線膨張係数が変化するので、そ
れに合わせて熱硬化性樹脂の配合、金型加熱温度を決定
すべきである。
（実施例１）表２に示す中芯材、熱硬化性樹脂（配
合）、金型加熱条件によって、成形を行ったところ、ヒ
ケのない良好な成形品が得られた。不飽和ポリエステル
樹脂の収縮量とエポキシ樹脂の中芯材の膨張量を一致さ
せるため、金型到達温度を１００℃とした。また、中芯
材の膨張と樹脂の収縮とが同期して起こるように金型昇
温速度と不飽和ポリエステル樹脂の配合（硬化速度）と
を定めた。Specific examples are shown below, but the present invention is not limited to these specific examples. In particular, since the linear expansion coefficient of the resin selected as the core material changes depending on its composition, the composition of the thermosetting resin and the mold heating temperature should be determined accordingly. (Example 1) When molding was performed using the core material, thermosetting resin (blend) and mold heating conditions shown in Table 2, a good molded product without sink marks was obtained. In order to make the shrinkage amount of the unsaturated polyester resin and the expansion amount of the core material of the epoxy resin match, the temperature reached by the mold was set to 100 ° C. Further, the mold temperature raising rate and the unsaturated polyester resin blending rate (curing rate) were determined so that the expansion of the core material and the contraction of the resin occur in synchronization.
【００２２】[0022]
【表２】 [Table 2]
【００２３】（実施例２）表３に示す中芯材、熱硬化性
樹脂（配合）、金型加熱条件によって成形を行ったとこ
ろ、ヒケのない良好な成形品が得られた。発泡ウレタン
樹脂の膨張率が小さいので、金型到達温度を１２０℃と
し、収縮量と膨張量とを合致させた。また、中芯材の膨
張と樹脂の収縮とが同期して起こるように金型昇温速度
と不飽和ポリエステル樹脂の配合（硬化速度）とを定め
た。(Example 2) Molding was performed using the core material, thermosetting resin (compounding), and mold heating conditions shown in Table 3, and a good molded product without sink marks was obtained. Since the expansion coefficient of the urethane foam resin is small, the temperature reached by the mold was set to 120 ° C. and the shrinkage amount and the expansion amount were matched. Further, the mold temperature raising rate and the unsaturated polyester resin blending rate (curing rate) were determined so that the expansion of the core material and the contraction of the resin occur in synchronization.
【００２４】[0024]
【表３】 [Table 3]
【００２５】（実施例３）表４に示す中芯材、熱硬化性
樹脂（配合）、金型加熱条件によって成形を行ったとこ
ろ、ヒケのない良好な成形品が得られた。ポリカーボネ
ート樹脂の熱膨張率が大きく、エポキシ樹脂の収縮量が
小さいので、金型到達温度は６０℃で十分である。ま
た、中芯材の膨張と樹脂の収縮とが同期するように昇温
速度とエポキシ樹脂の配合（硬化速度）を定めた。(Example 3) Molding was carried out using the core material, thermosetting resin (compounding) and mold heating conditions shown in Table 4, and a good molded product without sink marks was obtained. Since the thermal expansion coefficient of the polycarbonate resin is large and the shrinkage amount of the epoxy resin is small, the temperature reached by the mold of 60 ° C. is sufficient. Further, the temperature rising rate and the epoxy resin composition (curing rate) were determined so that the expansion of the core material and the contraction of the resin were synchronized.
【００２６】[0026]
【表４】 [Table 4]
【００２７】（比較例１）表５に示す中芯材、熱硬化性
樹脂（配合）、金型加熱条件によって成形を行ったとこ
ろ、成形品にはヒケが発生した。金型到達温度が４０℃
と低く、中芯材のエポキシ樹脂の膨張が小さく、不飽和
ポリエステル樹脂の収縮を補うことができなかったため
である。(Comparative Example 1) When molding was performed under the conditions of the core material, thermosetting resin (compounding) and mold heating conditions shown in Table 5, sink marks were generated in the molded product. Mold reaching temperature is 40 ℃
This is because the epoxy resin of the core material has a small expansion and the shrinkage of the unsaturated polyester resin cannot be compensated.
【００２８】[0028]
【表５】 [Table 5]
【００２９】（比較例２）表６に示す中芯材、熱硬化性
樹脂（配合）、金型加熱条件によって成形を行ったとこ
ろ、成形品にはヒケが発生した。金型昇温速度を遅くし
たため、中芯材の膨張が遅くなり、一方不飽和ポリエス
テル樹脂には硬化剤のメチルエチルケトンパーオキサイ
ドが多く配合されており、硬化速度が早くなっている。
このため、樹脂の硬化収縮と中芯材の膨張とが同期せ
ず、中芯材の膨張が遅れる結果となった。Comparative Example 2 When molding was performed under the conditions of the core material, thermosetting resin (compounding) and mold heating conditions shown in Table 6, sink marks were generated in the molded product. Since the mold heating rate is slowed down, the expansion of the core material is slowed down. On the other hand, the unsaturated polyester resin contains a large amount of methyl ethyl ketone peroxide as a curing agent, so that the curing rate is fast.
For this reason, the curing shrinkage of the resin and the expansion of the core material are not synchronized with each other, resulting in a delay in the expansion of the core material.
【００３０】[0030]
【表６】 [Table 6]
【００３１】[0031]
【発明の効果】以上説明したように、この発明の熱硬化
性樹脂成形品の製法によれば、硬化収縮の大きな不飽和
ポリエステル樹脂などの熱硬化性樹脂であっても、成形
品表面にヒケのない仕上がりの良好な成形品を製造する
ことができる。また、金型を加圧する従来製法に比較し
て、成形品の形状が曲面形状などの複雑な形状であって
も、ヒケの発生を防止できる。金型を加圧する必要がな
いので、製造設備が簡略化でき、金型寿命も延びるなど
の効果が得られる。As described above, according to the method for producing a thermosetting resin molded article of the present invention, even if a thermosetting resin such as an unsaturated polyester resin having a large curing shrinkage is applied to the surface of the molded article, a sink mark occurs. It is possible to produce a molded product having a good finish and no deterioration. Further, as compared with the conventional manufacturing method in which a mold is pressed, even if the shape of the molded product is a complicated shape such as a curved shape, the occurrence of sink marks can be prevented. Since it is not necessary to pressurize the mold, the manufacturing equipment can be simplified and the life of the mold can be extended.
【図面の簡単な説明】[Brief description of drawings]
【図１】 本発明の製法の一例を示す概略構成図であ
る。FIG. 1 is a schematic configuration diagram showing an example of a manufacturing method of the present invention.
【図２】 本発明の製法の一例を示す概略構成図であ
る。FIG. 2 is a schematic configuration diagram showing an example of a manufacturing method of the present invention.
【図３】 本発明における中芯材の膨張と熱硬化性樹脂
の硬化収縮との時間変化を示したグラフである。FIG. 3 is a graph showing changes with time in the expansion of the core material and the curing shrinkage of the thermosetting resin in the present invention.
１…金型 ３…中芯材 ５…熱硬化性樹脂液 1 ... Mold 3 ... Core material 5 ... Thermosetting resin liquid
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 宣二 静岡県浜松市中沢町10番１号 ヤマハ株 式会社内 (56)参考文献 特開 昭61−92814（ＪＰ，Ａ) 特開 昭61−270123（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 39/00 - 39/44 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Seiji Suzuki, No. 10-1 Nakazawa-cho, Hamamatsu-shi, Shizuoka Prefecture Yamaha Corporation (56) References JP 61-92814 (JP, A) JP 61 -270123 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) B29C 39/00-39/44
Claims (3)
金型内の中芯材の周囲に熱硬化性樹脂液を注入し、金型
を加熱して熱硬化性樹脂を硬化する際に、 上記熱硬化性樹脂の硬化収縮体積量に見合った体積膨張
量を中芯材に生起せしめるとともに、中芯材の膨張と熱
硬化性樹脂の硬化収縮とを同期させることを特徴とする
熱硬化性樹脂成形品の製法。1. A core material is placed in advance in a mold, and then a thermosetting resin liquid is injected around the core material in the mold, and the mold is heated to cure the thermosetting resin. In the case of producing a volume expansion amount corresponding to the curing shrinkage volume of the thermosetting resin in the core material, the expansion of the core material and the curing shrinkage of the thermosetting resin are synchronized. A method for producing thermosetting resin molded products.
金型内の中芯材の周囲に熱硬化性樹脂液を注入し、金型
を加熱して熱硬化性樹脂を硬化する際に、 硬化開始時から硬化完了までの時間内に、常時上記熱硬
化性樹脂の硬化収縮体積量より大きい体積膨張量を中芯
材に生起せしめることを特徴とする熱硬化性樹脂成形品
の製法。 2. A core material is previously placed in a mold, and then
Inject the thermosetting resin liquid around the core material in the mold,
When the thermosetting resin is heated by heating the thermosetting resin, the thermosetting resin is always used within the time from the start of curing to the completion of curing.
Volume expansion amount greater than the curing shrinkage volume of the volatile resin
Thermosetting resin molded product characterized by being generated in a material
Manufacturing method.
するものであることを特徴とする請求項１または２記載
の熱硬化性樹脂成形品の製法。 3. The core material constitutes a part of a thermosetting resin molded product.
3. The method according to claim 1 or 2, characterized in that
Manufacturing method of thermosetting resin moldings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16171499A JP3463608B2 (en) | 1998-06-26 | 1999-06-08 | Manufacturing method of thermosetting resin molded products |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10-181195 | 1998-06-26 | ||
| JP18119598 | 1998-06-26 | ||
| JP16171499A JP3463608B2 (en) | 1998-06-26 | 1999-06-08 | Manufacturing method of thermosetting resin molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000079620A JP2000079620A (en) | 2000-03-21 |
| JP3463608B2 true JP3463608B2 (en) | 2003-11-05 |
Family
ID=26487747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16171499A Expired - Fee Related JP3463608B2 (en) | 1998-06-26 | 1999-06-08 | Manufacturing method of thermosetting resin molded products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3463608B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018193908A1 (en) | 2017-04-18 | 2018-10-25 | 三菱ケミカル株式会社 | Fiber-reinforced composite material molded article and method for producing same |
| WO2019176568A1 (en) | 2018-03-16 | 2019-09-19 | 三菱ケミカル株式会社 | Sheet molding compound and carbon fiber composite material molded article |
-
1999
- 1999-06-08 JP JP16171499A patent/JP3463608B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018193908A1 (en) | 2017-04-18 | 2018-10-25 | 三菱ケミカル株式会社 | Fiber-reinforced composite material molded article and method for producing same |
| WO2019176568A1 (en) | 2018-03-16 | 2019-09-19 | 三菱ケミカル株式会社 | Sheet molding compound and carbon fiber composite material molded article |
| US11512412B2 (en) | 2018-03-16 | 2022-11-29 | Mitsubishi Chemical Corporation | Sheet molding compound and carbon fiber composite material molded article |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000079620A (en) | 2000-03-21 |
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