JP2800664B2 - Method for producing melamine resin molded article - Google Patents
Method for producing melamine resin molded articleInfo
- Publication number
- JP2800664B2 JP2800664B2 JP31621293A JP31621293A JP2800664B2 JP 2800664 B2 JP2800664 B2 JP 2800664B2 JP 31621293 A JP31621293 A JP 31621293A JP 31621293 A JP31621293 A JP 31621293A JP 2800664 B2 JP2800664 B2 JP 2800664B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- melamine resin
- melamine
- sprue
- cavity
- 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
- 229920000877 Melamine resin Polymers 0.000 title claims description 64
- 239000004640 Melamine resin Substances 0.000 title claims description 46
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000012778 molding material Substances 0.000 claims description 29
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 17
- 229920005989 resin Polymers 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- 238000001746 injection moulding Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 description 11
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 239000002966 varnish Substances 0.000 description 3
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 2
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000006482 condensation reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XOAAWQZATWQOTB-UHFFFAOYSA-N taurine Chemical compound NCCS(O)(=O)=O XOAAWQZATWQOTB-UHFFFAOYSA-N 0.000 description 2
- 102220585282 PH domain leucine-rich repeat-containing protein phosphatase 1_A60L_mutation Human genes 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000007974 melamines Chemical class 0.000 description 1
- JYIZNFVTKLARKT-UHFFFAOYSA-N phenol;1,3,5-triazine-2,4,6-triamine Chemical compound OC1=CC=CC=C1.NC1=NC(N)=NC(N)=N1 JYIZNFVTKLARKT-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- -1 powdered pulp Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229960003080 taurine Drugs 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、メラミン系樹脂成形品
の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a melamine resin molded article.
【０００２】[0002]
【従来の技術】メラミン樹脂は、メラミンとホルムアル
デヒドとを縮合反応させて得られる。得られたメラミン
樹脂のワニスに充填剤、離型剤及び硬化助剤等を添加し
てメラミン樹脂成形材料を得る。2. Description of the Related Art Melamine resins are obtained by a condensation reaction between melamine and formaldehyde. A melamine resin molding material is obtained by adding a filler, a release agent, a curing aid, and the like to the obtained melamine resin varnish.
【０００３】メラミン樹脂成形材料は、熱硬化性樹脂成
形材料であり配線器具及び電気器具等の各種電気部品並
びに食器等の素材として広く利用されている。このメラ
ミン樹脂成形材料を金型等により射出成形して各種成形
品を得る。これらの成形品を製造する際に要求されるこ
とは、成形時間の短縮である。A melamine resin molding material is a thermosetting resin molding material, and is widely used as a material for various electric parts such as wiring appliances and electric appliances and tableware. This melamine resin molding material is injection-molded with a mold or the like to obtain various molded products. What is required when manufacturing these molded products is to reduce the molding time.
【０００４】上記の要求を満足するためには、メラミン
樹脂成形材料の硬化助剤の含有量を多くしたり、メラミ
ン樹脂成形材料にアルコール等を添加する必要があっ
た。[0004] In order to satisfy the above requirements, it was necessary to increase the content of a curing aid in the melamine resin molding material or to add alcohol or the like to the melamine resin molding material.
【０００５】そして、メラミンフェノール樹脂成形材料
や変性メラミン樹脂成形材料等のメラミン系樹脂成形材
料についても成形時間の短縮を行うためには、上記のよ
うに硬化助剤の含有量を多くしたり、アルコール等を添
加する必要があった。In order to shorten the molding time of melamine resin molding materials such as melamine phenol resin molding materials and modified melamine resin molding materials, it is necessary to increase the content of the curing aid as described above, It was necessary to add alcohol and the like.
【０００６】ところが、メラミン系樹脂成形材料の硬化
助剤の含有量を多くすると、射出成形困難になり、保存
安定性が悪くなるという問題があった。However, when the content of the curing aid in the melamine resin molding material is increased, there is a problem that injection molding becomes difficult and storage stability deteriorates.
【０００７】さらに、メラミン系樹脂成形材料にアルコ
ール等を添加すると、このメラミン系樹脂成形材料がケ
ーキングするという問題があった。Further, when alcohol or the like is added to the melamine resin molding material, there is a problem that the melamine resin molding material cakes.
【０００８】したがって、出来るだけ一般的な配合を用
いて、しかも成形時間が短いメラミン系樹脂成形品の製
造方法が求められていた。Therefore, there has been a demand for a method for producing a melamine-based resin molded article using a general compound as much as possible and having a short molding time.
【０００９】[0009]
【発明が解決しようとする課題】本発明は上記の点に鑑
みて成されたもので、その目的とするところは、成形時
間が短いメラミン系樹脂成形品の製造方法を提供するこ
とにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a method for producing a melamine resin molded article having a short molding time.
【００１０】[0010]
【課題を解決するための手段】本発明の請求項１に係る
メラミン系樹脂成形品の製造方法は、メラミン樹脂を含
有する成形材料をスプルー及びランナーの接する部分の
金型温度２００〜２５０℃にて射出成形することを特徴
とする。According to a first aspect of the present invention, there is provided a method for producing a melamine-based resin molded product, wherein a molding material containing a melamine resin is heated to a mold temperature of 200 to 250 ° C. at a portion where a sprue and a runner contact. And injection molding.
【００１１】本発明の請求項２に係るメラミン系樹脂成
形品の製造方法は、メラミン樹脂を含有する成形材料を
キャビティ内で成形品と接する部分の金型温度２００〜
２５０℃にて射出成形することを特徴とする。According to a second aspect of the present invention, there is provided a method for producing a melamine-based resin molded product, wherein a molding material containing a melamine resin is brought into contact with the molded product in a cavity at a mold temperature of 200-200.
It is characterized by injection molding at 250 ° C.
【００１２】本発明の請求項３に係るメラミン系樹脂成
形品の製造方法は、メラミン樹脂を含有する成形材料を
スプルー及びランナーの接する部分の金型温度並びにキ
ャビティ内で成形品と接する部分の金型温度２００〜２
５０℃にて射出成形することを特徴とする。According to a third aspect of the present invention, there is provided a method for producing a melamine-based resin molded product, wherein a molding material containing a melamine resin is heated at a mold temperature at a portion where the sprue and the runner are in contact, and at a portion where the mold material is in contact with the molded product in the cavity. Mold temperature 200-2
It is characterized by injection molding at 50 ° C.
【００１３】以下、本発明を詳述する。本発明に用いる
マトリクス樹脂であるメラミン樹脂は、メラミンに対す
るホルムアルデヒドのモル比を１．０〜２．０として、
ｐＨ７．０〜９．５で温度６０〜１００℃で３０〜１２
０分間縮合反応させて得られる。得られたメラミン樹脂
のワニス１００重量部に対し、パルプ等の充填剤２０〜
４０重量部を加え、含浸してメラミン浸透品にする。Hereinafter, the present invention will be described in detail. Melamine resin which is a matrix resin used in the present invention, the molar ratio of formaldehyde to melamine is 1.0 to 2.0,
30 to 12 at a temperature of 60 to 100 ° C at pH 7.0 to 9.5
Obtained by performing a condensation reaction for 0 minutes. 100 parts by weight of the varnish of the obtained melamine resin, a filler such as pulp 20 to
Add 40 parts by weight and impregnate to make a melamine-penetrated product.
【００１４】また、メラミン樹脂のワニスを脱水乾燥機
等により脱水固形化して、メラミン固形樹脂を得る。A melamine resin varnish is dehydrated and solidified by a dehydrator or the like to obtain a melamine solid resin.
【００１５】次に上記メラミン浸透品を乾燥機により乾
燥して得られたメラミン乾燥品を粉砕機により粉砕し、
例えばメラミン乾燥品１００重量部に対して、ステアリ
ン酸亜鉛等の離型剤０．２〜２重量部及びタウリン、無
水フタル酸等の硬化助剤０．２〜０．５重量部、顔料
０．５〜１．５重量部、場合によっては、メラミン固形
樹脂、粉末パルプ、石こう等も加えてボールミル、混練
機等により混合分散及び混練をして、メラミン樹脂成形
材料を得ることができる。Next, the melamine infiltrated product is dried by a dryer, and the melamine dried product obtained is pulverized by a pulverizer.
For example, with respect to 100 parts by weight of the dried melamine, 0.2 to 2 parts by weight of a releasing agent such as zinc stearate, 0.2 to 0.5 parts by weight of a curing aid such as taurine and phthalic anhydride, and 0.1% by weight of a pigment. A melamine resin molding material can be obtained by adding and mixing 5 to 1.5 parts by weight, in some cases, melamine solid resin, powdered pulp, gypsum and the like, and mixing and dispersing and kneading with a ball mill, kneader or the like.
【００１６】以上のようにして得たメラミン樹脂成形材
料を射出成形機により射出成形し、成形品を得る。The melamine resin molding material obtained as described above is injection molded by an injection molding machine to obtain a molded product.
【００１７】通常メラミン樹脂成形材料を射出成形する
ときのスプルー及びランナーの接する部分の金型温度
（以下スプルー及びランナー温度という。）は、１６５
〜１７５℃程度であるが、このスプルー及びランナー温
度をさらに高くして２００〜２５０℃にすることによ
り、短い最小キュア時間でメラミン樹脂成形品を得るこ
とができる。Normally, when the melamine resin molding material is injection-molded, the mold temperature of the part where the sprue and the runner are in contact (hereinafter referred to as the sprue and runner temperature) is 165.
The temperature is about 175 ° C., but by further increasing the temperature of the sprue and the runner to 200 to 250 ° C., a melamine resin molded article can be obtained in a short minimum curing time.
【００１８】この最小キュア時間とは、ふくれ等のない
所定の成形品ができる最小の硬化時間である。すなわ
ち、最小キュア時間より、短い時間の成形では、成形品
にふくれ等が発生し、所定の成形品ができない。そこ
で、最小キュア時間に例えば１０秒程度加えて成形時間
としている。The minimum curing time is the minimum curing time for forming a predetermined molded product without blistering or the like. That is, if the molding is performed for a time shorter than the minimum curing time, blisters and the like occur in the molded product, and a predetermined molded product cannot be formed. Therefore, the molding time is set by adding, for example, about 10 seconds to the minimum curing time.
【００１９】前記スプルー及びランナー温度は、例えば
熱電対等の温度センサーで測定し、金型の加熱は、例え
ば複数の棒状の電熱ヒーター等で行い、それぞれ加熱温
度を制御できるようになっている。The sprue and runner temperatures are measured by, for example, a temperature sensor such as a thermocouple, and the mold is heated by, for example, a plurality of rod-shaped electric heaters, so that the heating temperature can be controlled.
【００２０】すなわち、ＪＩＳテストピースの成形で、
キャビティ内で成形品と接する部分の金型温度（以下キ
ャビティ内温度という。）が１６５〜１７５℃程度の場
合であって、スプルー及びランナー温度が１６５〜１７
５℃程度のときの最小キュア時間は、４０秒程度である
のに対して、このスプルー及びランナー温度が２００〜
２５０℃のときの最小キュア時間は、３０秒程度にな
る。That is, in forming a JIS test piece,
The mold temperature (hereinafter referred to as the cavity temperature) of the portion in contact with the molded product in the cavity is about 165 to 175 ° C, and the sprue and runner temperatures are 165 to 17
The minimum curing time at about 5 ° C. is about 40 seconds, whereas the sprue and runner temperatures are 200 to
The minimum curing time at 250 ° C. is about 30 seconds.
【００２１】また、通常メラミン樹脂成形材料を射出成
形するときのキャビティ内温度は、１６５〜１７５℃程
度であるが、このキャビティ内温度をさらに高くして２
００〜２５０℃にすることにより、短い最小キュア時間
でメラミン樹脂成形品を得ることができる。In general, the temperature in the cavity at the time of injection molding of the melamine resin molding material is about 165 to 175 ° C.
By setting the temperature to 00 to 250 ° C., a melamine resin molded product can be obtained in a short minimum curing time.
【００２２】すなわち、スプルー及びランナー温度が１
６５〜１７５℃程度の場合であって、キャビティ内温度
が１６５〜１７５℃程度のときの最小キュア時間は、４
０秒程度であるのに対して、このキャビティ内温度が２
００〜２５０℃のときの最小キュア時間は、３０秒程度
になる。That is, when the sprue and runner temperatures are 1
When the temperature in the cavity is about 165 to 175 ° C. when the temperature is about 65 to 175 ° C., the minimum curing time is 4
Although the time in this cavity is about 2 seconds,
The minimum curing time at 00 to 250 ° C. is about 30 seconds.
【００２３】通常メラミン樹脂成形材料を射出成形する
ときのスプルー及びランナー温度並びにキャビティ内温
度が１６５〜１７５℃程度であるが、このスプルー及び
ランナー温度並びにキャビティ内温度をさらに高くして
２００〜２５０℃にすることにより、さらに短い最小キ
ュア時間でメラミン樹脂成形品を得ることができる。Usually, the temperature of the sprue and the runner and the temperature in the cavity at the time of injection molding of the melamine resin molding material are about 165 to 175 ° C., and the temperature of the sprue and the runner and the temperature in the cavity are further increased to 200 to 250 ° C. By doing so, a melamine resin molded article can be obtained with a shorter minimum curing time.
【００２４】すなわち、スプルー及びランナー温度が１
６５〜１７５℃程度であって、かつキャビティ内温度が
１６５〜１７５℃程度のときの最小キュア時間は、４０
秒程度であるのに対して、前記スプルー及びランナー温
度が２００〜２５０℃であって、かつ前記キャビティ内
温度が２００〜２５０℃のときの最小キュア時間は、２
０秒程度になる。That is, when the sprue and runner temperatures are 1
The minimum curing time when the temperature is about 65 to 175 ° C. and the temperature in the cavity is about 165 to 175 ° C. is 40
While the minimum curing time when the temperature of the sprue and the runner is 200 to 250 ° C. and the temperature of the cavity is 200 to 250 ° C. is 2 seconds.
It takes about 0 seconds.
【００２５】以上のようにキャビティ内温度を上げずに
通常の１６５〜１７５℃程度のままで、スプルー及びラ
ンナー温度のみをヒーターでさらに加熱して、温度を上
げても、最小キュア時間が短縮できるし、その逆にスプ
ルー及びランナー温度を上げずに通常の１６５〜１７５
℃程度のままで、キャビティ内温度のみをヒーターでさ
らに加熱して、温度を上げても、最小キュア時間が短縮
できる。As described above, the minimum curing time can be shortened even if the sprue and runner temperatures alone are further heated by the heater without raising the temperature in the cavity and the normal temperature is maintained at about 165 to 175 ° C. Conversely, without raising the temperature of the sprue and runner, the normal 165 to 175
Even if the temperature inside the cavity is further increased by a heater while the temperature is kept at about ° C. and the temperature is increased, the minimum curing time can be reduced.
【００２６】ここで、スプルー及びランナー温度並びに
キャビティ内温度が２００℃未満では、最小キュア時間
の短縮効果が小さく、スプルー及びランナー温度並びに
キャビティ内温度が２５０℃を越えると、メラミン樹脂
が分解してしまう。Here, if the temperature of the sprue and runner and the temperature in the cavity are less than 200 ° C., the effect of shortening the minimum curing time is small, and if the temperature of the sprue and runner and the temperature in the cavity exceed 250 ° C., the melamine resin is decomposed. I will.
【００２７】以上により、短い最小キュア時間でメラミ
ン系樹脂成形品を得るために、スプルー及びランナー温
度並びにキャビティ内温度を２００〜２５０℃にするの
がよいが、好ましくはスプルー及びランナー温度並びに
キャビティ内温度を２１０〜２３０℃にするのがよい。As described above, in order to obtain a melamine-based resin molded product with a short minimum curing time, the temperature of the sprue and the runner and the temperature in the cavity are preferably set to 200 to 250 ° C., preferably the temperature of the sprue and the runner and the temperature in the cavity. The temperature is preferably between 210 and 230C.
【００２８】なお、上記メラミン樹脂成形材料は、本発
明の効果を損なわない範囲で他の樹脂、例えばフェノー
ル樹脂等をメラミン樹脂とともに含有するメラミン系樹
脂成形材料であってもよい。The melamine resin molding material may be a melamine resin molding material containing another resin such as a phenol resin together with the melamine resin as long as the effects of the present invention are not impaired.
【００２９】以上により、本発明のメラミン系樹脂成形
品の製造方法によると、短い成形時間でメラミン系樹脂
成形品を得ることができる。As described above, according to the method for producing a melamine resin molded article of the present invention, a melamine resin molded article can be obtained in a short molding time.
【００３０】[0030]
【作用】本発明によると、メラミン樹脂を含有する成形
材料を射出成形するとき、通常のスプルー及びランナー
温度である１６５〜１７５℃程度よりスプルー及びラン
ナー温度をさらに高くして２００〜２５０℃にすること
により、メラミン樹脂を含有する成形材料がキャビティ
に入る前に反応が進み、ゲート内での発熱も大きくなっ
て、硬化時間が短縮され、最小キュア時間が短くなる。
すなわち、成形時間の短縮ができる。According to the present invention, when a molding material containing a melamine resin is injection-molded, the temperature of the sprue and the runner is raised to 200 to 250 ° C. from the usual sprue and runner temperature of about 165 to 175 ° C. As a result, the reaction proceeds before the molding material containing the melamine resin enters the cavity, the heat generation in the gate increases, the curing time is shortened, and the minimum curing time is shortened.
That is, the molding time can be reduced.
【００３１】また、メラミン樹脂を含有する成形材料を
射出成形するとき、通常のキャビティ内温度である１６
５〜１７５℃程度よりキャビティ内温度をさらに高くし
て２００〜２５０℃にすることにより反応が進み、短い
最小キュア時間でメラミン系樹脂成形品を得ることがで
きる。すなわち、短い成形時間でメラミン系樹脂成形品
を得ることができる。When a molding material containing a melamine resin is injection-molded, the usual cavity temperature of 16 is used.
The reaction proceeds by further raising the temperature in the cavity from about 5 to 175 ° C to 200 to 250 ° C, and a melamine-based resin molded article can be obtained with a short minimum curing time. That is, a melamine-based resin molded product can be obtained in a short molding time.
【００３２】[0032]
【実施例】以下、本発明を実施例によって詳述する。The present invention will be described below in detail with reference to examples.
【００３３】実施例１〜実施例２１及び比較例１〜比較
例４については、ＪＩＳテストピースの射出成形におい
て、松下電工製のメラミン系樹脂成形材料のＭＥ９９２
Ａ６０Ｌを使用し、スプルー及びランナー温度並びにキ
ャビティ内温度を変えたときの最小キュア時間を調べ
た。その結果を表１に示した。In Examples 1 to 21 and Comparative Examples 1 to 4, ME992 of a melamine resin molding material manufactured by Matsushita Electric Works, Ltd. in injection molding of JIS test pieces.
Using A60L, the minimum cure time when the sprue and runner temperatures and the temperature in the cavity were changed was examined. The results are shown in Table 1.
【００３４】このＭＥ９９２Ａ６０Ｌには、硬化助剤と
して無水フタル酸が成形材料の全量に対して０．２２％
含有されている。This ME992A60L contains phthalic anhydride as a curing aid in an amount of 0.22% based on the total amount of the molding material.
It is contained.
【００３５】[0035]
【表１】 [Table 1]
【００３６】表１の結果、比較例１及び比較例２のよう
に、キャビティ内温度が１７０℃の場合であって、スプ
ルー及びランナー温度が１７０〜１９５℃のときの最小
キュア時間は、３４〜４０秒であるのに対して、実施例
１〜実施例３のように、このスプルー及びランナー温度
が２１０〜２５０℃のときの最小キュア時間は、２７〜
２９秒になっている。As shown in Table 1, as in Comparative Examples 1 and 2, when the temperature in the cavity is 170 ° C. and the sprue and runner temperatures are 170 to 195 ° C., the minimum curing time is 34 to In contrast to 40 seconds, the minimum curing time when the sprue and runner temperatures are 210 to 250 ° C. as in Examples 1 to 3 is 27 to
It has been 29 seconds.
【００３７】また、比較例１及び比較例３のように、ス
プルー及びランナー温度が１７０℃の場合であって、キ
ャビティ内温度が１７０〜１９５℃程度のときの最小キ
ュア時間は、３３〜４０秒であるのに対して、実施例
７、実施例１２及び実施例１７のように、このキャビテ
ィ内温度が２１０〜２５０℃のときの最小キュア時間
は、２８〜３２秒になっている。As in Comparative Examples 1 and 3, when the sprue and runner temperatures are 170 ° C. and the temperature in the cavity is about 170 to 195 ° C., the minimum curing time is 33 to 40 seconds. On the other hand, as in Examples 7, 12 and 17, the minimum curing time when the temperature in the cavity is 210 to 250 ° C. is 28 to 32 seconds.
【００３８】さらに、比較例１及び比較例４のように、
スプルー及びランナー温度が１７０及び１９５℃であっ
て、かつキャビティ内温度が１７０及び１９５℃のとき
の最小キュア時間は、３０〜４０秒であるのに対して、
実施例９〜実施例１１、実施例１４〜実施例１６及び実
施例１９〜実施例２１のように、上記スプルー及びラン
ナー温度が２１０〜２５０℃であって、かつ前記キャビ
ティ内温度が２１０〜２５０℃のときの最小キュア時間
は、１６〜２０秒になっている。Further, as in Comparative Examples 1 and 4,
The minimum curing time when the sprue and runner temperatures are 170 and 195 ° C. and the temperature in the cavity is 170 and 195 ° C. is 30 to 40 seconds,
As in Examples 9 to 11, Example 14 to Example 16, and Example 19 to Example 21, the temperature of the sprue and the runner is 210 to 250 ° C, and the temperature in the cavity is 210 to 250 ° C. The minimum curing time at ℃ is 16-20 seconds.
【００３９】なお、このメラミン系樹脂成形品の曲げ強
さ及び圧縮強さ等の一般特性は、従来品と同等であっ
た。The melamine resin molded product had the same general properties as bending strength and compressive strength as those of the conventional product.
【００４０】[0040]
【発明の効果】本発明の請求項１及び請求項２に係るメ
ラミン系樹脂成形品の製造方法によると、短い成形時間
でメラミン系樹脂成形品を得ることができる。According to the method for producing a melamine resin molded article according to the first and second aspects of the present invention, a melamine resin molded article can be obtained in a short molding time.
【００４１】本発明の請求項３に係るメラミン系樹脂成
形品の製造方法によると、さらに短い成形時間でメラミ
ン系樹脂成形品が得ることができる。According to the method for producing a melamine resin molded article according to the third aspect of the present invention, a melamine resin molded article can be obtained in a shorter molding time.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 45/00,45/72 - 45/73,45/78 C08L 61/28──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 6 , DB name) B29C 45 / 00,45 / 72-45 / 73,45 / 78 C08L 61/28
Claims (3)
ルー及びランナーの接する部分の金型温度２００〜２５
０℃にて射出成形することを特徴とするメラミン系樹脂
成形品の製造方法。1. A mold material containing a melamine resin and a mold temperature of 200 to 25 at a portion where a sprue and a runner contact.
A method for producing a melamine-based resin molded product, comprising injection molding at 0 ° C.
ビティ内で成形品と接する部分の金型温度２００〜２５
０℃にて射出成形することを特徴とするメラミン系樹脂
成形品の製造方法。2. A mold temperature of 200 to 25 at a portion where a molding material containing a melamine resin contacts a molded product in a cavity.
A method for producing a melamine-based resin molded product, comprising injection molding at 0 ° C.
ルー及びランナーの接する部分の金型温度並びにキャビ
ティ内で成形品と接する部分の金型温度２００〜２５０
℃にて射出成形することを特徴とするメラミン系樹脂成
形品の製造方法。3. A mold temperature of a portion where a molding material containing a melamine resin is in contact with a sprue and a runner and a mold temperature of a portion in contact with a molded product in a cavity are 200 to 250.
A method for producing a melamine-based resin molded product, which is injection-molded at a temperature of ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31621293A JP2800664B2 (en) | 1993-12-16 | 1993-12-16 | Method for producing melamine resin molded article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31621293A JP2800664B2 (en) | 1993-12-16 | 1993-12-16 | Method for producing melamine resin molded article |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07164470A JPH07164470A (en) | 1995-06-27 |
| JP2800664B2 true JP2800664B2 (en) | 1998-09-21 |
Family
ID=18074553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31621293A Expired - Lifetime JP2800664B2 (en) | 1993-12-16 | 1993-12-16 | Method for producing melamine resin molded article |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2800664B2 (en) |
-
1993
- 1993-12-16 JP JP31621293A patent/JP2800664B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07164470A (en) | 1995-06-27 |
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