JPH06341225A - Form made of synthetic resin - Google Patents
Form made of synthetic resinInfo
- Publication number
- JPH06341225A JPH06341225A JP13196593A JP13196593A JPH06341225A JP H06341225 A JPH06341225 A JP H06341225A JP 13196593 A JP13196593 A JP 13196593A JP 13196593 A JP13196593 A JP 13196593A JP H06341225 A JPH06341225 A JP H06341225A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- weight
- synthetic resin
- ethylene
- mold
- 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
Links
Landscapes
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、軽量性、耐衝撃性、寸
法安定性、均一発泡性等に優れた発泡合成樹脂製型枠に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam synthetic resin mold having excellent lightness, impact resistance, dimensional stability, uniform foamability and the like.
【０００２】[0002]
【従来の技術】鉄筋コンクリート等を用いた基礎工事を
行う際、型枠を用いて囲いを作り、ここにコンクリート
を流し込む作業を行う。通常この型枠は南洋材を用いた
合板又は鋼材で作られている。2. Description of the Related Art When performing a foundation work using reinforced concrete or the like, an enclosure is formed using a formwork, and concrete is poured therein. Usually this formwork is made of plywood or steel with South Sea timber.
【０００３】[0003]
【発明が解決しようとする課題】木製の型枠はコンクリ
ートに含まれる水やアルカリ成分により腐食されやすい
ため寿命が短く、又材料の調達も難しくなりつつある。
また鋼材は錆びやすい。本発明者等は種々検討の結果、
合成樹脂製型枠の樹脂組成を特殊の組成とすることによ
り問題を解決し得ることを見出し、本発明を完成した。The wooden formwork has a short life because it is easily corroded by water and alkali components contained in concrete, and it is becoming difficult to procure materials.
Also, steel materials easily rust. As a result of various investigations by the present inventors,
The present invention has been completed by finding that the problem can be solved by making the resin composition of the synthetic resin mold frame a special composition.
【０００４】[0004]
【課題を解決するための手段】本発明の要旨は、コンク
リートを施工する際の囲いとして用いる合成樹脂製の型
枠であって、該型枠が、カーボンブラックを０．０５〜
０．２重量％含有するポリエチレン樹脂を倍率１．０５
〜１．５倍に発泡させた粒状体とした原料Ａ及びポリエ
チレン樹脂粒状体からなる原料Ｂを用意し、原料Ａが５
〜４５重量％、原料Ｂが５５〜９５重量％の混合原料１
００重量部に対し、発泡剤を加えた混合物を射出成形し
て得た発泡倍率１．０５〜１．５の射出成形品によって
形成されたものであることを特徴とする合成樹脂製型枠
に存する。SUMMARY OF THE INVENTION The gist of the present invention is a synthetic resin mold used as an enclosure when constructing concrete, wherein the mold contains carbon black of 0.05 to
Polyethylene resin containing 0.2% by weight 1.05
A raw material A, which is a granular body expanded by 1.5 times and a raw material B made of polyethylene resin granular bodies, are prepared.
~ 45 wt% and raw material B 55-95 wt% mixed raw material 1
A synthetic resin mold, characterized by being formed from an injection-molded product having a foaming ratio of 1.05 to 1.5 obtained by injection-molding a mixture containing a foaming agent to 100 parts by weight. Exist.
【０００５】本発明の型枠について説明する。本発明の
型枠は基本的にはポリエチレンの低発泡成形品からな
り、このような材質とすることにより成形品を肉厚のも
のとすることが可能となり剛性、耐撓み性に優れた設計
とすることができる。The formwork of the present invention will be described. The mold of the present invention basically consists of a low-foaming molded product of polyethylene, and by using such a material, it is possible to make the molded product thicker and to design with excellent rigidity and flex resistance. can do.
【０００６】一方、上述したような低発泡成形品だけで
は素材としての耐衝撃性の向上は望めない。そこで合成
樹脂製型枠を構成する樹脂組成を耐衝撃性に優れたもの
とし、低発泡構造と組合せることにより総合的に大変優
れた型枠を提供する。On the other hand, improvement in impact resistance as a raw material cannot be expected only with the low-foam molded article as described above. Therefore, by providing a resin composition that constitutes a synthetic resin mold with excellent impact resistance and combining it with a low-foaming structure, an overall excellent mold is provided.
【０００７】合成樹脂製型枠を構成する樹脂組成は以下
の通りとする。カーボンブラックを０．０５〜０．２重
量％含有するポリエチレン樹脂からなる倍率１．０５〜
１．５倍に発泡した粒状体からなる原料Ａを用意する。
原料Ａを予め倍率１．０５〜１．５倍に発泡させること
により得ようとする最終成形品の発泡状態が良好とな
る。本発明の大きな特徴点がここにある。原料Ａの成分
であるポリエチレン樹脂の一例としてはエチレン単独重
合体又はエチレンと他のαーオレフィンとの共重合体が
挙げられ、無発泡状態での密度が０．９４〜０．９７ｇ
／ｃｍ3（ＪＩＳ Ｋ ６９１１）でメルトインデック
ス２〜１０ｇ／１０分、好ましくは３〜７ｇ／１０分、
（ＪＩＳ Ｋ ７２１０）のものが良い。エチレンと他
のαーオレフィンとの共重合体を用いる場合、共重合さ
れるαーオレフィンとしては、プロピレン、ブテン、イ
ソプレン、ペンテン、メチルペンテン等が挙げられ共重
合量としては０．２〜８重量％程度が好ましい。The resin composition of the synthetic resin mold is as follows. Magnification 1.05 consisting of polyethylene resin containing 0.05 to 0.2% by weight of carbon black
A raw material A composed of a 1.5-fold expanded granular material is prepared.
By foaming the raw material A in advance at a ratio of 1.05 to 1.5, the foamed state of the final molded product to be obtained becomes good. This is a major feature of the present invention. An example of the polyethylene resin which is a component of the raw material A is an ethylene homopolymer or a copolymer of ethylene and another α-olefin, and the density in a non-foaming state is 0.94 to 0.97 g.
/ Cm 3 (JIS K 6911), melt index 2 to 10 g / 10 minutes, preferably 3 to 7 g / 10 minutes,
(JIS K 7210) is preferable. When a copolymer of ethylene and another α-olefin is used, examples of the α-olefin to be copolymerized include propylene, butene, isoprene, pentene, and methylpentene, and the copolymerization amount is 0.2 to 8% by weight. A degree is preferable.
【０００８】原料Ａには、更にエチレン−酢酸ビニル共
重合体が含有されていることが望ましい、エチレン−酢
酸ビニル共重合体の原料Ａに含まれる量としては０．２
〜５重量％程度が良い、このエチレン−酢酸ビニル共重
合体としては酢酸ビニル成分が１０〜２５重量％、好ま
しくは１５〜２０重量％のものが用いられる。エチレン
−酢酸ビニル共重合体が含有された場合の原料Ａの成分
割合は、カーボンブラック０．０５〜０．２重量％、エ
チレン−酢酸ビニル共重合体０．２〜５重量％、ポリエ
チレン樹脂９４．８〜９９．７５重量％のようになる。
これらの成分からなる原料Ａは倍率１．０５〜１．５倍
に発泡した粒状体からなる。例えば、カーボンブラック
が配合されたポリエチレン樹脂であって１．０５〜１．
５倍に発泡された粒状物と無発泡のエチレン−酢酸ビニ
ル共重合体粒状物との混合物とするのが一般的である。
原料Ａの発泡したポリエチレン樹脂にはタルク等の無機
粉末や顔料、各種添加剤が加えられていてもよい。発泡
は後述する発泡剤を添加して成形する等しておこなわれ
る。無機粉末を添加する場合には０．０５〜３．０重量
％程度であろう。原料Ａは直径１５ｍｍの開孔を通過す
る大きさの粒状体であることが望ましい。It is desirable that the raw material A further contains an ethylene-vinyl acetate copolymer. The amount of the ethylene-vinyl acetate copolymer contained in the raw material A is 0.2.
The ethylene-vinyl acetate copolymer has a vinyl acetate component of 10 to 25% by weight, preferably 15 to 20% by weight. When the ethylene-vinyl acetate copolymer is contained, the content ratio of the raw material A is 0.05 to 0.2% by weight of carbon black, 0.2 to 5% by weight of ethylene-vinyl acetate copolymer, and the polyethylene resin 94. 8 to 99.75% by weight.
The raw material A composed of these components is a granular material foamed at a magnification of 1.05 to 1.5. For example, a polyethylene resin blended with carbon black, which is 1.05-1.
It is generally a mixture of 5-fold expanded particles and non-expanded ethylene-vinyl acetate copolymer particles.
Inorganic powder such as talc, pigment, and various additives may be added to the foamed polyethylene resin of the raw material A. Foaming is performed by adding a foaming agent described later and molding. If inorganic powder is added, it will be about 0.05 to 3.0% by weight. The raw material A is preferably a granular material having a size that passes through an opening having a diameter of 15 mm.
【０００９】原料Ａと混合する原料Ｂのポリエチレン樹
脂の一例としてはエチレン単独重合体又はエチレンと他
のαーオレフィンとの共重合体が挙げられ、密度０．９
４〜０．９７ｇ／ｃｍ3（ＪＩＳ Ｋ ６９１１）でメ
ルトインデックス２〜１０ｇ／１０分、好ましくは３〜
７ｇ／１０分、（ＪＩＳ Ｋ ７２１０）のものが良
い。エチレンと共重合される他のαーオレフィンとして
は、プロピレン、ブテン、イソプレン、ペンテン、メチ
ルペンテン等が挙げられ共重合量としては０．２〜８重
量％程度が好ましい。また、これらのポリエチレン樹脂
粒状体は直径１５ｍｍの開孔を通過する大きさの粒状体
であることが望ましい。An example of the polyethylene resin of the raw material B mixed with the raw material A is an ethylene homopolymer or a copolymer of ethylene and another α-olefin, and has a density of 0.9.
4 to 0.97 g / cm 3 (JIS K 6911), melt index 2 to 10 g / 10 minutes, preferably 3 to
7 g / 10 min, (JIS K 7210) is preferable. Examples of other α-olefin copolymerized with ethylene include propylene, butene, isoprene, pentene, and methylpentene, and the copolymerization amount is preferably about 0.2 to 8% by weight. Further, it is desirable that these polyethylene resin granules are granules of a size that passes through an opening having a diameter of 15 mm.
【００１０】原料Ａと原料Ｂは原料Ａ５〜４５重量％、
原料Ｂ５５〜９５重量％の割合で混合され、この混合原
料１００重量部に対し、発泡剤を通常０．５〜２．０重
量部程度加えた混合物に調製される。この場合の調製は
通常ドライブレンドが用いられる。発泡剤としては、通
常使用されている有機質または無機質の発泡剤が使用可
能である、例えばＮ，Ｎ’−ジニトロソペンタメチレン
テトラミン、Ｐ，Ｐ’−オキシビスベンゼンスルホニル
ヒドラジド、Ｐ−トルエンスルホニルヒドラジド、アゾ
ビスイソブチルニトリル、アゾジカルボン酸アミド、重
炭酸ナトリウム、硝酸アンモン等が挙げられる。通常、
分解温度が１８０〜２３０°Ｃ程度のものが好適に用い
られる。また、気体の発泡剤として窒素ガス、炭酸ガス
等があげられ、これらの気体の発泡剤は上記した有機質
または無機質の発泡剤と併用して使用出来る。The raw material A and the raw material B are 5 to 45% by weight of the raw material A,
The raw material B is mixed in a proportion of 55 to 95% by weight, and about 0.5 to 2.0 parts by weight of a foaming agent is usually added to 100 parts by weight of the mixed raw material to prepare a mixture. In this case, dry blending is usually used. As the foaming agent, a commonly used organic or inorganic foaming agent can be used, for example, N, N′-dinitrosopentamethylenetetramine, P, P′-oxybisbenzenesulfonylhydrazide, P-toluenesulfonylhydrazide. , Azobisisobutyl nitrile, azodicarboxylic acid amide, sodium bicarbonate, ammonium nitrate and the like. Normal,
Those having a decomposition temperature of about 180 to 230 ° C. are preferably used. Further, examples of the gas foaming agent include nitrogen gas and carbon dioxide gas, and these gas foaming agents can be used in combination with the above-mentioned organic or inorganic foaming agents.
【００１１】発泡助剤として無機粉末を併用するのが好
ましく。無機粉末は平均粒径０．５〜３０μ程度のもの
を原料Ａと原料Ｂの混合原料１００重量部に対し、０．
０５〜３．０重量部程度用いるのが良い。無機粉末とし
てはタルク、炭酸カルシウム、ケイ酸カルシウム、クレ
ー、カオリン、シリカ、ケイソウ土、アルミナ、酸化チ
タン等の一般的に合成樹脂の充填剤として用いられるも
のであればいずれでも良く、単独もしくは混合して用い
られる。更に、フェノール系、チオエーテル系、リン
系、脂肪酸金属塩などの熱安定剤を原料Ａと原料Ｂの混
合原料１００重量部に対し、０．０１〜０．５重量部程
度用いるのが良い。ベンゾトリアゾール系（商品名チヌ
ビン３２６ 日本チバガイギー社製等）等の耐候剤やサ
ノールＬＳ−７７０（商品名）（三共（株）製）等の光
安定剤を原料Ａと原料Ｂの混合原料１００重量部に対
し、０．０１〜１．０重量部程度用いるのが良い。更
に、目的に応じタルク等の無機粉末、カーボンブラッ
ク、チタンホワイト等の無機・有機の顔料等種々の添加
剤を加えても良い。It is preferable to use an inorganic powder together as a foaming aid. The inorganic powder having an average particle size of about 0.5 to 30 μm is 0.
It is preferable to use about 05 to 3.0 parts by weight. The inorganic powder may be any one commonly used as a filler for synthetic resins such as talc, calcium carbonate, calcium silicate, clay, kaolin, silica, diatomaceous earth, alumina and titanium oxide, either alone or in a mixture. Used. Further, it is preferable to use a heat stabilizer such as phenol-based, thioether-based, phosphorus-based, and fatty acid metal salt in an amount of about 0.01 to 0.5 parts by weight based on 100 parts by weight of the mixed raw material A and raw material B. 100% by weight of a mixed raw material A and raw material B such as a benzotriazole-based (Tinubin 326 manufactured by Nippon Ciba Geigy) weathering agent and a light stabilizer such as Sanol LS-770 (trade name) manufactured by Sankyo Co., Ltd. It is preferable to use about 0.01 to 1.0 part by weight per part. Further, various additives such as inorganic powder such as talc and inorganic / organic pigments such as carbon black and titanium white may be added depending on the purpose.
【００１２】上述した組成の合成樹脂を射出成形して、
型枠を得る。射出成形条件は、通常の条件でよく、例え
ば、溶融温度（シリンダ温度）２００〜２５０°Ｃ、射
出率２０００〜５０００ｃｃ／ｓｅｃ程度の条件が選ば
れる。得られた成形品は表面に無発泡層を有する発泡倍
率１．０５〜１．５程度のものとなる。原料Ａを予め倍
率１．０５〜１．５倍に発泡した粒状体とすることによ
り均一な発泡が行われ、寸法安定性の向上に役立つと考
えられ、カーボンブラックは耐候性の向上に役立つと考
えられる。原料Ａ中のエチレン−酢酸ビニル共重合体は
耐衝撃性の向上に役立つと考えられる。Injection molding of a synthetic resin having the above composition,
Get the formwork. The injection molding conditions may be ordinary conditions, for example, a melting temperature (cylinder temperature) of 200 to 250 ° C. and an injection rate of 2000 to 5000 cc / sec are selected. The obtained molded product has a non-foaming layer on the surface and a foaming ratio of about 1.05 to 1.5. It is considered that the raw material A is preliminarily foamed to a ratio of 1.05 to 1.5 times for uniform foaming, which is considered to be useful for improving dimensional stability. Carbon black is believed to be useful for improving weather resistance. Conceivable. The ethylene-vinyl acetate copolymer in raw material A is considered to help improve impact resistance.
【００１３】型枠は射出成形により一体成形してもよい
が、型枠を数個の分割された部材として射出成形し、こ
れを溶着等により組み立てることも考えられる。この溶
着法によれば内部のリブ等の構造を一体成形のものに比
べ複雑な構造とすることが出来る。溶着の方法として
は、表面を弗素樹脂等で加工した加熱板の表面に、型枠
を形成する部材の溶着する部分を押しつけて溶融状態と
し、これを互いに付き合わせて押圧することによればよ
い。型枠形成部材は上記した組成で形成されているから
寸法安定性が良く、突き合わせて溶接する際に突合せ面
の位置ずれが少なく、溶着部強度が向上する。The mold may be integrally molded by injection molding, but it is also conceivable that the mold is injection molded as several divided members and assembled by welding or the like. According to this welding method, the internal ribs and the like can have a more complicated structure than the integrally formed structure. As a method of welding, it suffices to press the welding portion of the member forming the form into a molten state on the surface of the heating plate whose surface has been processed with a fluororesin or the like, and bring them into contact with each other and press them. . Since the mold frame forming member is formed of the above-described composition, it has good dimensional stability, the displacement of the abutting surfaces is small during the butt welding, and the welded portion strength is improved.
【００１４】[0014]
実施例１ カーボンブラックを０．１重量％、タルク０．２重量％
含有する発泡倍率１．２のポリエチレン樹脂（密度０．
９６ｇ／ｃｍ3、ＭＩ４ｇ／１０分）の粒状体からなる
原料Ａ（平均径７ｍｍ）を用意した。平均径７ｍｍの大
きさの粒状のポリエチレン樹脂（密度０．９６ｇ／ｃｍ
3、ＭＩ：４ｇ／１０分）からなる原料Ｂを用意した。
原料Ａ１０重量部、原料Ｂ９０重量部、カーボンブラッ
ク０．１重量部、アゾジカルボンアミド（発泡剤）０．
８重量部を加えた混合物を混合機でドライブレンドし
た。Example 1 0.1% by weight of carbon black and 0.2% by weight of talc
Polyethylene resin with a foaming ratio of 1.2 (density 0.
A raw material A (average diameter 7 mm) made of a granular material of 96 g / cm 3 , MI 4 g / 10 min) was prepared. Granular polyethylene resin with an average diameter of 7 mm (density 0.96 g / cm
3 , raw material B consisting of MI: 4 g / 10 min) was prepared.
Raw material A 10 parts by weight, raw material B 90 parts by weight, carbon black 0.1 parts by weight, azodicarbonamide (foaming agent) 0.
The mixture containing 8 parts by weight was dry blended in a mixer.
【００１５】このようにして調製した原料を温度２２０
°Ｃ、射出率３０００ｃｃ／ｓｅｃで射出成形し、発泡
倍率１．２の型枠を前面部分と背後部分に２分割した形
状の型枠形成部材を得た。２つの型枠形成部材の対向面
を弗素樹脂等で加工した加熱板（２２０°Ｃ）の表面に
押しつけ、溶融状態とし、これを互いに付き合わせて押
圧することにより一体化した。得られた合成樹脂製型枠
は剛性、寸法安定性等に優れたものであった。The raw material prepared in this manner is used at a temperature of 220.
Injection molding was performed at ° C and an injection rate of 3000 cc / sec to obtain a mold forming member having a shape with a foaming ratio of 1.2 divided into a front part and a rear part. The opposing surfaces of the two mold forming members were pressed against the surface of a heating plate (220 ° C.) processed with a fluororesin or the like to bring them into a molten state, and these were brought into contact with each other and pressed to be integrated. The obtained synthetic resin mold was excellent in rigidity, dimensional stability and the like.
【００１６】実施例２ カーボンブラックを０．１重量％、タルク０．２重量％
含有する発泡倍率１．２のポリエチレン樹脂（密度０．
９６ｇ／ｃｍ3、ＭＩ４ｇ／１０分）の粒状体９８重量
部、エチレン−酢酸ビニル共重合体（酢酸ビニル含有量
１９重量％）の粒状体２重量部、からなる原料Ａ（エチ
レン−酢酸ビニル共重合体の大部分は粒状のポリエチレ
ン樹脂の表面に付着した状態で存在）（平均径７ｍｍ）
を用意した。平均径７ｍｍの大きさの粒状のポリエチレ
ン樹脂（密度０．９６ｇ／ｃｍ3、ＭＩ：４ｇ／１０
分）からなる原料Ｂを用意した。原料Ａ１０重量部、原
料Ｂ９０重量部、カーボンブラック０．１重量部、アゾ
ジカルボンアミド（発泡剤）０．８重量部を加えた混合
物を混合機でドライブレンドした。Example 2 0.1% by weight of carbon black and 0.2% by weight of talc
Polyethylene resin with a foaming ratio of 1.2 (density 0.
96 g / cm 3 , MI 4 g / 10 min) of 98 parts by weight of granules, ethylene-vinyl acetate copolymer (vinyl acetate content 19% by weight) of granules 2 parts by weight of raw material A (ethylene-vinyl acetate copolymer Most of the polymer exists in the state of being attached to the surface of the granular polyethylene resin) (average diameter 7 mm)
Prepared. Granular polyethylene resin with an average diameter of 7 mm (density 0.96 g / cm 3 , MI: 4 g / 10
Min) was prepared. A mixture obtained by adding 10 parts by weight of raw material A, 90 parts by weight of raw material B, 0.1 part by weight of carbon black, and 0.8 part by weight of azodicarbonamide (foaming agent) was dry blended with a mixer.
【００１７】このようにして調製した原料を温度２２０
°Ｃ、射出率３０００ｃｃ／ｓｅｃで射出成形し、発泡
倍率１．２の型枠を前面部分と背後部分に２分割した形
状の型枠形成部材を得た。２つの型枠形成部材の対向面
を弗素樹脂等で加工した加熱板（２２０°Ｃ）の表面に
押しつけ、溶融状態とし、これを互いに付き合わせて押
圧することにより一体化した。得られた合成樹脂製型枠
は剛性、寸法安定性等に優れたものであった。The raw material thus prepared is heated to a temperature of 220.
Injection molding was performed at ° C and an injection rate of 3000 cc / sec to obtain a mold forming member having a shape with a foaming ratio of 1.2 divided into a front part and a rear part. The opposing surfaces of the two mold forming members were pressed against the surface of a heating plate (220 ° C.) processed with a fluororesin or the like to bring them into a molten state, and these were brought into contact with each other and pressed to be integrated. The obtained synthetic resin mold was excellent in rigidity, dimensional stability and the like.
【００１８】[0018]
【発明の効果】このようにして得られた型枠は、原料Ａ
を予め倍率１．０５〜１．５倍に発泡した粒状体とする
ことにより最終製品が均一な発泡体となり、寸法安定性
の向上、に役立つと考えられ、カーボンブラックは耐候
性向上に役立つと考えられる。原料Ａ中のエチレン−酢
酸ビニル共重合体は耐衝撃性の向上に役立つと考えられ
る。これらの働きにより寸法安定性に優れる型枠となる
ので、型枠を分割した形状の部材として形成し、溶着に
より組み立てる方式とした場合にも溶着部がズレて溶着
されるようなことが少なくなり製品強度の均一化、歩留
まり向上も望まれる。このようにして耐衝撃性、剛性、
寸法安定性等に優れた合成樹脂製型枠が得られる。The formwork thus obtained is made of the raw material A
It is considered that the final product will be a uniform foamed body by making the foamed material into a foamed body with a ratio of 1.05 to 1.5 times in advance, and it will be useful for improving dimensional stability, and carbon black will be useful for improving weather resistance. Conceivable. The ethylene-vinyl acetate copolymer in raw material A is considered to help improve impact resistance. Because of these functions, it becomes a mold with excellent dimensional stability.Therefore, even when the mold is formed as a member with a divided shape and assembled by welding, the welded parts will not be displaced and welded. It is also desired to make the product strength uniform and improve the yield. In this way impact resistance, rigidity,
A synthetic resin mold having excellent dimensional stability can be obtained.
Claims (6)
用いる合成樹脂製の型枠であって、該型枠が、カーボン
ブラックを０．０５〜０．２重量％含有するポリエチレ
ン樹脂を倍率１．０５〜１．５倍に発泡させた粒状体と
した原料Ａ及びポリエチレン樹脂粒状体からなる原料Ｂ
を用意し、原料Ａが５〜４５重量％、原料Ｂが５５〜９
５重量％の混合原料１００重量部に対し、発泡剤を加え
た混合物を射出成形して得た発泡倍率１．０５〜１．５
の射出成形品によって形成されたものであることを特徴
とする合成樹脂製型枠。1. A synthetic resin mold used as an enclosure when constructing concrete, wherein the mold contains a polyethylene resin containing 0.05 to 0.2% by weight of carbon black at a ratio of 1.05. ~ Raw material A made into a 1.5-fold expanded granular material and raw material B made of polyethylene resin granular material
5 to 45% by weight of raw material A and 55 to 9 of raw material B
Foaming ratio 1.05 to 1.5 obtained by injection-molding a mixture obtained by adding a foaming agent to 100 parts by weight of a mixed raw material of 5% by weight.
A mold made of synthetic resin, which is formed by the injection-molded product of 1.
用いる合成樹脂製の型枠であって、該型枠が、カーボン
ブラック０．０５〜０．２重量％、エチレン−酢酸ビニ
ル共重合体０．２〜５重量％、ポリエチレン樹脂９４．
８〜９９．７５重量％からなる倍率１．０５〜１．５倍
に発泡させた粒状体とした原料Ａ及びポリエチレン樹脂
粒状体からなる原料Ｂを用意し、原料Ａが５〜４５重量
％、原料Ｂが５５〜９５重量％からなる原料１００重量
部に対し、発泡剤を加えた混合物を射出成形して得た発
泡倍率１．０５〜１．５の射出成形品によって形成され
たものであることを特徴とする合成樹脂製型枠。2. A mold made of synthetic resin, which is used as an enclosure when concrete is constructed, wherein the mold is 0.05 to 0.2% by weight of carbon black, ethylene-vinyl acetate copolymer 0.1. 2 to 5% by weight, polyethylene resin 94.
8 to 99.75% by weight of a raw material A foamed to a ratio of 1.05 to 1.5 times and a raw material B made of polyethylene resin particles are prepared. The raw material A is 5 to 45% by weight, It is formed by an injection molded product having a foaming ratio of 1.05 to 1.5 obtained by injection molding a mixture containing a foaming agent to 100 parts by weight of the raw material B containing 55 to 95% by weight of the raw material B. A synthetic resin formwork characterized in that
４〜０．９７ｇ／ｃｍ3（無発泡状態での密度）でメル
トインデックス２〜１０ｇ／１０分のエチレン単独重合
体又はエチレンと他のαーオレフィンとの共重合体であ
ることを特徴とする請求項１に記載の合成樹脂製型枠。3. The polyethylene resin as the raw material A has a density of 0.9.
An ethylene homopolymer having a melt index of 4 to 0.97 g / cm 3 (density in a non-foamed state) of 2 to 10 g / 10 min or a copolymer of ethylene and another α-olefin. Item 1. A synthetic resin mold according to Item 1.
が酢酸ビニル成分が１０〜２５重量％のエチレン−酢酸
ビニル共重合体であることを特徴とする請求項１に記載
の合成樹脂製型枠。4. The synthetic resin mold according to claim 1, wherein the ethylene-vinyl acetate copolymer of the raw material A is an ethylene-vinyl acetate copolymer having a vinyl acetate component of 10 to 25% by weight. frame.
デックス２〜１０ｇ／１０分のエチレン単独重合体又は
エチレンと他のαーオレフィンとの共重合体であること
を特徴とする請求項１に記載の合成樹脂製型枠。5. The synthesis according to claim 1, wherein the polyethylene resin as the raw material B is an ethylene homopolymer having a melt index of 2 to 10 g / 10 min or a copolymer of ethylene and another α-olefin. Resin formwork.
孔を通過する大きさの粒状体であることを特徴とする請
求項１に記載の合成樹脂製型枠。6. The synthetic resin mold according to claim 1, wherein the raw material A and the raw material B are granular bodies having a size that passes through an opening having a diameter of 15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13196593A JPH06341225A (en) | 1993-06-02 | 1993-06-02 | Form made of synthetic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13196593A JPH06341225A (en) | 1993-06-02 | 1993-06-02 | Form made of synthetic resin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06341225A true JPH06341225A (en) | 1994-12-13 |
Family
ID=15070370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13196593A Pending JPH06341225A (en) | 1993-06-02 | 1993-06-02 | Form made of synthetic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06341225A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002322808A (en) * | 2001-04-27 | 2002-11-08 | Nkk Corp | Plastic composite panel |
| JP2005061047A (en) * | 2003-08-12 | 2005-03-10 | Fukuvi Chem Ind Co Ltd | Form for placing concrete |
-
1993
- 1993-06-02 JP JP13196593A patent/JPH06341225A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002322808A (en) * | 2001-04-27 | 2002-11-08 | Nkk Corp | Plastic composite panel |
| JP2005061047A (en) * | 2003-08-12 | 2005-03-10 | Fukuvi Chem Ind Co Ltd | Form for placing concrete |
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