JPH032657B2 - - Google Patents
Info
- Publication number
- JPH032657B2 JPH032657B2 JP55100066A JP10006680A JPH032657B2 JP H032657 B2 JPH032657 B2 JP H032657B2 JP 55100066 A JP55100066 A JP 55100066A JP 10006680 A JP10006680 A JP 10006680A JP H032657 B2 JPH032657 B2 JP H032657B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- foam
- foaming
- parts
- weight
- 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
- 239000006260 foam Substances 0.000 claims description 31
- 238000005187 foaming Methods 0.000 claims description 27
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 17
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 17
- 239000004604 Blowing Agent Substances 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 11
- 239000003431 cross linking reagent Substances 0.000 claims description 6
- 239000004088 foaming agent Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000004620 low density foam Substances 0.000 description 4
- 239000004156 Azodicarbonamide Substances 0.000 description 3
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 3
- 235000019399 azodicarbonamide Nutrition 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000011496 polyurethane foam Substances 0.000 description 2
- -1 toluenesulfonyl semicarbazide Chemical compound 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 2
- YUJXLBCNMLSZFM-UHFFFAOYSA-N (2-azidophenyl)-phenyldiazene Chemical compound [N-]=[N+]=NC1=CC=CC=C1N=NC1=CC=CC=C1 YUJXLBCNMLSZFM-UHFFFAOYSA-N 0.000 description 1
- UBRWPVTUQDJKCC-UHFFFAOYSA-N 1,3-bis(2-tert-butylperoxypropan-2-yl)benzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC(C(C)(C)OOC(C)(C)C)=C1 UBRWPVTUQDJKCC-UHFFFAOYSA-N 0.000 description 1
- WVGXBYVKFQJQGN-UHFFFAOYSA-N 1-tert-butylperoxy-2-propan-2-ylbenzene Chemical compound CC(C)C1=CC=CC=C1OOC(C)(C)C WVGXBYVKFQJQGN-UHFFFAOYSA-N 0.000 description 1
- ICGLPKIVTVWCFT-UHFFFAOYSA-N 4-methylbenzenesulfonohydrazide Chemical compound CC1=CC=C(S(=O)(=O)NN)C=C1 ICGLPKIVTVWCFT-UHFFFAOYSA-N 0.000 description 1
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920006327 polystyrene foam Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Description
【発明の詳細な説明】
この発明は寸法安定性の優れたエチレン−酢酸
ビニル共重合体（以下EVAという）の低密度発
泡体の製法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a low-density foam of ethylene-vinyl acetate copolymer (hereinafter referred to as EVA) having excellent dimensional stability.
出願人は先にEVAの著しい低密度発泡体の製
法として特願昭54−65843号を提案した。この提
案は、高発泡にして低密度EVA発泡体の製法と
して、発泡剤を多量に配合した原料シートを成形
型で加熱発泡させるにし、脱型に先立つて金型を
冷却するもので、これによつて金型内で分解した
ガス圧を一時的に低下出来、脱型に当つて気泡体
の炸裂飛散といつたことを生ずることなく製品を
金型を取出すことが出来るようにしたものであ
る。しかしながら発明者らがこの提案について更
に検討してみると、上記先願発明はなお製品の寸
法安定性、外観形状に於いて必ずしも満足すべき
ものではなかつた。特に、脱型して取り出された
製品をみると、外側周縁部において著しい炸裂を
生じ、場合によつてはこの亀裂が中央部へ及ぶこ
とも生じていた。なお、製品の外周に発生する飛
散・亀裂部分はその後に切削除去され、中央部の
良好な発泡材のみ成品として使用されるが、ここ
に廃棄される原料の無駄およびそれを切除するた
めの工程はそれだけ製品原価を引き上げることに
なつていた。この発明は従来のかかる問題を解決
するためにされれたものであるが、そのために本
発明が採用した方法は、二段階発泡を採用したも
ので、第１段の発泡で発泡剤の一部を分解させ、
つづく第２段の発泡で発泡を完了させ、かつ第１
段の発泡後脱型前に金型を冷却するようにしたも
のである。 The applicant previously proposed Japanese Patent Application No. 1984-65843 as a method for producing a significantly low density EVA foam. This proposal involves heating and foaming a raw material sheet containing a large amount of blowing agent in a mold as a manufacturing method for highly foaming, low-density EVA foam, and cooling the mold before demolding. Therefore, the pressure of the gas decomposed in the mold can be temporarily lowered, and the product can be taken out of the mold without causing the explosion and scattering of air bubbles during demolding. . However, when the inventors further studied this proposal, they found that the prior invention was still not necessarily satisfactory in terms of the dimensional stability and external shape of the product. In particular, when the product was demolded and taken out, significant bursting occurred at the outer periphery, and in some cases, the cracks extended to the center. The scattered and cracked parts that occur on the outer periphery of the product are then cut and removed, and only the good foam material in the center is used as a finished product, but there is a waste of raw materials discarded here and the process to remove it. was bound to increase product costs accordingly. This invention was made in order to solve the conventional problems, but the method adopted by the present invention for this purpose employs two-stage foaming, in which a part of the foaming agent is used in the first stage of foaming. to be decomposed,
The foaming is completed in the subsequent second stage of foaming, and the first stage of foaming is completed.
The mold is cooled after foaming the stage and before demolding.
即ちこの発明は、成形型内に、エチレン−酢酸
ビニル共重合体100重量部に対し発泡剤20〜80重
量部、架橋剤1.0〜5.0重量部をそれぞれ添加混ね
りした発泡体原料を充填し、その後この成形型を
被蓋で強固に閉塞し、ついでこれを加熱して発泡
剤の１部を分解させ、ここに一次発泡体を成形
し、しかるのちこれを型内に保持したままで、発
泡時の温度よりも70〜120℃低い温度まで冷却し
てから脱型し、更にこの一次発泡成形体を別の成
形型に再び充填し、再度加熱して発泡を最終的に
完了させたのち脱型することを特徴とする低密度
合成樹脂発泡体の製造法である。 That is, this invention fills a mold with a foam raw material prepared by adding and mixing 20 to 80 parts by weight of a blowing agent and 1.0 to 5.0 parts by weight of a crosslinking agent to 100 parts by weight of an ethylene-vinyl acetate copolymer, The mold is then tightly closed with a lid, heated to decompose a portion of the foaming agent, and a primary foam is molded therein. After cooling to a temperature 70 to 120 degrees Celsius lower than the initial temperature, the mold is removed, and this primary foam molded product is again filled into another mold, heated again to finally complete foaming, and then removed. This is a method for producing a low-density synthetic resin foam, which is characterized by molding.
以下に、この発明の詳細を説明する。 The details of this invention will be explained below.
この発明に用いられる主原料エチレン−酢酸ビ
ニル共重合体は、任意のコンパウンドのものが用
いられるが、通常エチレン100に対し酢酸ビニル
10〜40のものが使用される。かかる共重合体に
は、発泡剤、架橋剤、その他を添加し、これを例
えばロールで十分混練してシートとする。ここに
用いる発泡剤は、従来のEVA発泡体に使用され
て来たものがそのまま用いられる。例えば、アゾ
ジカーボンアミド、ジニトロソペンタメチレンテ
トラミン、ｐ−トルエンスルフオニルヒドラジ
ン、アゾビスイソブチロニトリル、ジアゾアミノ
アゾベンゼン、トルエンスルホニルセミカルバジ
ドである。これらの発泡剤はEVA100重量部に対
し20〜80重量部、好ましくは20〜50重量部とす
る。これが20重量部に未たないと低密度発泡体が
得られず、また80重量部を越えると急激な発泡が
行なわれて安定した気泡体が製造出来なくなる。 The main raw material ethylene-vinyl acetate copolymer used in this invention can be of any compound, but usually 100% of ethylene is mixed with vinyl acetate.
10 to 40 are used. A blowing agent, a crosslinking agent, and others are added to such a copolymer, and the mixture is thoroughly kneaded using, for example, a roll to form a sheet. The blowing agent used here is the same as that used in conventional EVA foams. For example, azodicarbonamide, dinitrosopentamethylenetetramine, p-toluenesulfonylhydrazine, azobisisobutyronitrile, diazoaminoazobenzene, toluenesulfonyl semicarbazide. The amount of these blowing agents is 20 to 80 parts by weight, preferably 20 to 50 parts by weight, per 100 parts by weight of EVA. If the amount is less than 20 parts by weight, a low-density foam cannot be obtained, and if it exceeds 80 parts by weight, rapid foaming occurs and a stable foam cannot be produced.
従来、ここにおける発泡剤の使用量が５〜15重
量部であつたことからすれば、発泡剤の添加量が
大巾に増大していることがこの発明の特色の一つ
となつている。発泡剤の外に、架橋剤を添加す
る。ここにおける架橋剤としては、例えばジクミ
ルパーオキサイド、１，３ビス（ターシヤルブチ
ルパーオキシ−イソプロピル）ベンゼン、ｍ−オ
クタデジルアジドホルメート、ターシヤリブチル
パーオキシクメン等の有機過酸化物である。これ
の添加量は、発泡剤の使用量とも関連するが、
EVA100重量部に対し１〜５重量部、好ましくは
１〜２重量部である。これが1.0重量部にみたな
いと架橋が十分に行なわれず、また５重量部を越
えると発泡剤とのバランスが失なわれて不安定な
発泡が行なわれる。その他の添加剤としは、発泡
助剤として尿素、アミン、着色剤、充填剤をあげ
ることが出来る。上記の混合原料は十分混練した
のち、これをシート状とし、所定の形状に切断し
てこれを成形型の中に充填する。ここに用いる成
形型は任意の形でよいが、発泡成形品の脱型に当
つて製品が一挙に型内から飛出すので、上広形の
開口部を有しているものがよい。発泡原料は成形
型に略充満するか、ややこれを押圧するようにし
て充填してから型に被蓋をしてこれを強固に固定
する。被蓋の固定方法は任意でよいが、型蓋の開
閉を自在に出来、しかも閉型を強固に行なうのに
便利な方法は、プレス機を用い、その先端に型の
被蓋を装着し、これで型の開閉を行なう方法であ
る。被蓋で閉型したのちはただちにこれを加熱し
て発泡させる。加熱温度は、使用した発泡剤の分
解温度によつて定まるが、大体160〜170℃前後で
ある。次に、発泡が一定の段階に達したところ
で、これをそのまま一たん冷却する。ここにおけ
る冷却温度は、使用する原料すなわちEVAの酢
酸ビニルのコンテント、発泡剤の種類およびその
使用量、架橋剤の種類およびその使用量その他に
よつて定めるもので、一律に定めることは出来な
いが、加熱発泡時の温度よりも70〜120℃低い50
〜90℃とする。この冷却は、強制冷却として、例
えば、金型のジヤケツトに冷却水を送るなどして
行なう。この冷却によつて加熱発泡で出来た
EVA発泡体の充満された型の内圧は低下すると
考えられるが、これはEVAの発泡時発生した蒸
気圧が、１時的な温度低下によつて減少するため
と推察される。この状態を経て成形型は開放さ
れ、これによつてEVA発泡体は型内から飛出す
状態で型から脱型され、１次発泡体が得られる。
ここに得られる１次発泡体は、脱型に先立つて加
熱温度よりも70〜120℃も低い温度まで強制冷却
していることもあつて発泡倍率は10〜15倍、密度
で0.07〜0.1と中発泡、中密度となる。そしてそ
の製品は寸法安定性、外観性が少しも損なわれな
い。次に、この１次発泡体をこれと略同型の金型
に充填し、これを被蓋で強固に閉塞し、再度加熱
して発泡を完了させる。ここに於ける加熱温度は
第１次発泡の加熱温度よりも低く、110℃〜130℃
程度とする。これによつて原料中の未反応の発泡
剤が全て分解し上記の如く発泡が完了するもので
ある。この段階で金型を開放すると、製品は金型
から一挙に飛出し、最終的な高発泡、低密度の気
泡体が得られる。ここに於ける気泡体の密度は通
常0.02〜0.05、発泡倍率は15〜50倍にも達する。
しかもその気泡体は、上記の如く１次、２次の２
段階発泡を採用したことによつて寸法安定性、外
観性は格段に向上し、特に気泡体外周の縁部は略
直線上となつて、その後の面取り等の仕上げ加工
を要することなくそのまま製品とすることが出来
る。 Conventionally, the amount of blowing agent used here was 5 to 15 parts by weight, but one of the features of the present invention is that the amount of blowing agent added is greatly increased. In addition to the blowing agent, a crosslinking agent is added. Examples of the crosslinking agent here include organic peroxides such as dicumyl peroxide, 1,3-bis(tert-butylperoxy-isopropyl)benzene, m-octadecyl azide formate, and tert-butyl peroxycumene. . The amount added is also related to the amount of blowing agent used,
The amount is 1 to 5 parts by weight, preferably 1 to 2 parts by weight, per 100 parts by weight of EVA. If the amount is less than 1.0 parts by weight, sufficient crosslinking will not occur, and if it exceeds 5 parts by weight, the balance with the foaming agent will be lost and unstable foaming will occur. Examples of other additives include urea, amines, colorants, and fillers as foaming aids. After the above-mentioned mixed raw materials are sufficiently kneaded, they are formed into a sheet, cut into a predetermined shape, and filled into a mold. The mold used here may be of any shape, but it is preferable to have a wide opening at the top because the product will fly out of the mold all at once when the foamed molded product is demolded. The foaming raw material is filled into the mold, or slightly pressed, and then the mold is covered and firmly fixed. You can fix the cover in any way you like, but a convenient way to open and close the mold cover freely and to securely close the mold is to use a press and attach the mold cover to the tip of the press. This is how to open and close the mold. After the mold is closed with a lid, it is immediately heated and foamed. The heating temperature is determined by the decomposition temperature of the blowing agent used, but is generally around 160 to 170°C. Next, once the foaming has reached a certain stage, the foam is cooled. The cooling temperature here is determined by the content of vinyl acetate in the raw material used, namely EVA, the type and amount of blowing agent used, the type and amount of crosslinking agent used, and cannot be set uniformly. , 70~120℃ lower than the temperature during heating and foaming 50
~90℃. This cooling is performed as forced cooling, for example, by sending cooling water to the jacket of the mold. This cooling results in heat foaming.
It is thought that the internal pressure of the mold filled with EVA foam decreases, and this is presumed to be because the vapor pressure generated during foaming of EVA decreases due to the temporary temperature drop. After this state, the mold is opened, and the EVA foam is removed from the mold in a state where it pops out of the mold, yielding a primary foam.
The primary foam obtained here has an expansion ratio of 10 to 15 times and a density of 0.07 to 0.1, as it is forcibly cooled to a temperature 70 to 120 degrees Celsius lower than the heating temperature before demolding. Medium foaming and medium density. The product does not suffer from any loss in dimensional stability or appearance. Next, this primary foam is filled into a mold of approximately the same type as the mold, which is tightly closed with a cover and heated again to complete foaming. The heating temperature here is lower than the heating temperature for the primary foaming, and is 110℃ to 130℃.
degree. As a result, all of the unreacted foaming agent in the raw materials is decomposed and foaming is completed as described above. When the mold is opened at this stage, the product flies out of the mold all at once, yielding the final highly foamed, low-density foam. The density of the foam here is usually 0.02 to 0.05, and the expansion ratio is as high as 15 to 50 times.
Moreover, as mentioned above, the bubbles are composed of two types, primary and secondary.
By adopting staged foaming, the dimensional stability and appearance have been significantly improved.In particular, the edges of the outer periphery of the foam are almost straight, allowing the product to be used as is without the need for finishing processes such as chamfering. You can.
この発明方法によつて製造される高発泡、低密
度発泡体は、柔軟性を有するうえに反撥弾性、腰
の強さを兼ねそなえ、その特性は添附図が示すよ
うにポリウレタンフオーム、ポリエチレンフオー
ムといつた従来の気泡体にはみられないものがあ
る。図は本願発明品１、ポリスチレン２、ポリウ
レタン３の各気泡体につき応力−たわみ曲線（Ｓ
−Ｓ曲線）で、たわみ量を一定値とした場合で比
較したものである。これによつても判るように、
本願発明品はヒステリシスロスが少なく優れた発
泡体である。 The highly expanded, low-density foam produced by the method of this invention has not only flexibility but also rebound resilience and stiffness, and as shown in the attached diagram, its properties are comparable to those of polyurethane foam and polyethylene foam. There are things that cannot be seen in conventional foams. The figure shows stress-deflection curves (S
-S curve), the amount of deflection is set to a constant value. As can be seen from this,
The product of the present invention is an excellent foam with little hysteresis loss.
更に、このEVA発泡体は接着性が優れている
ところから、この点からもこれの利用価値は大巾
に拡大される。具体的には車輛用クツシヨン、各
種家具クツシヨン、押圧ひん度の多いクツシヨ
ン、その他産業用資材に広く用いられる。 Furthermore, since this EVA foam has excellent adhesive properties, its utility value is greatly expanded from this point of view as well. Specifically, it is widely used in vehicle cushions, various furniture cushions, cushions that are frequently pressed, and other industrial materials.
実施例 １
EVA（VAコンテント14％） 100重量部
ステアリン酸亜鉛 3.0 〃
ジクミロパーオキサイド 2.5 〃
アゾジカーボンアミド 22 〃
炭酸カルシウム 20 〃
上記原料を表面温度90℃のロールにて30分間混
ねりし、厚さ２mmのシートとした。これを深さ10
mm、縦34cm、横68cmの内形状を有し、かつ上部開
口が45゜に上広形の金型に５枚入れて、この上か
ら一枚板の被蓋をした。この型をプレス機で上下
から150Kg／cm2の圧力で押え、そのままプレス機
のジヤケツトに加熱蒸気を入れ、金型側温で170
℃に加熱して７分間保持した。その後、前記プレ
スの加熱蒸気を除去し、ここに蒸気に代えて水を
入れ、そのまま５分間保持したところ金型温度で
65℃になつた。然るのち、前記プレスを解放した
ところ、外寸法で3.3cm×64cm×145cm、密度
0.075の気泡体が得られた。この一次発泡体を寸
法が3.8cm×90cm×180cmの別型に入れてプレス機
で10Kg／cm2の圧力を加え、120℃で10分間再加熱
して発泡を完了させた。その後に型を解放し、外
寸法で3.8×100cm×200cm、密度0.031（発泡倍率
33倍）の外観性状良好な気泡体製品を得た。Example 1 EVA (VA content 14%) 100 parts by weight Zinc stearate 3.0 〃 Dicumyloperoxide 2.5 〃 Azodicarbonamide 22 〃 Calcium carbonate 20 〃 The above raw materials were mixed for 30 minutes using a roll with a surface temperature of 90°C. , a sheet with a thickness of 2 mm. Add this to a depth of 10
Five molds were placed in a wide mold with an inner shape of 34 cm in length and 68 cm in width with an upper opening of 45°, and a single plate was placed over the mold. This mold is pressed from above and below with a pressure of 150 kg/ cm2 , and then heated steam is put into the jacket of the press, and the temperature on the side of the mold reaches 170 kg/cm2.
℃ and held for 7 minutes. After that, the heated steam of the press was removed, water was added in place of the steam, and the mold was kept at the temperature for 5 minutes.
The temperature reached 65℃. After that, when the press was released, the outside dimensions were 3.3 cm x 64 cm x 145 cm, and the density was
A foam of 0.075 was obtained. This primary foam was placed in a separate mold with dimensions of 3.8 cm x 90 cm x 180 cm, a pressure of 10 Kg/cm 2 was applied using a press, and the foam was reheated at 120° C. for 10 minutes to complete foaming. After that, the mold was released, and the external dimensions were 3.8 x 100 cm x 200 cm, and the density was 0.031 (foaming ratio
A foam product with good appearance and properties was obtained (33 times).
実施例 ２
EVA（VAコンテント14％） 100
ステアリン酸亜鉛 3.0
アゾジカーボンアミド 30
炭酸カルシウム 20
ジクミルパーオキサイド 2.5
上記原料を表面温度90℃のロールにて30分間混
練りし厚さ２mmのシートとした。これを実施例１
と同様の金型に５枚入れて、この上から一枚板の
被蓋をした。この型をプレス機で上下から150
Kg／cm2の圧力で押え、そのままプレス機のジヤケ
ツトに加熱蒸気を入れ、金型側温で170℃に加熱
して10分間保持した。その後前記プレスの加熱蒸
気を除去し、水を入れそのまま５分間保持したと
ころ金型温度で65℃になつた。しかるのち、前記
プレスを解放したところ外寸法で3.6×68×150cm
密度0.063の気泡体が得られた。この一次発泡体
を寸法が3.8×90×180cmの別型に入れてプレス機
で10Kg／cm2の圧力を加え120℃で12分間再加熱し
て発泡を完了させた。その後型を解放し、外寸法
で4.1×110×215cm密度0.024（発泡倍率42倍）の
外観性状良好な気泡体製品を得た。Example 2 EVA (VA content 14%) 100 Zinc stearate 3.0 Azodicarbonamide 30 Calcium carbonate 20 Dicumyl peroxide 2.5 The above raw materials were kneaded for 30 minutes using a roll with a surface temperature of 90°C to form a 2 mm thick sheet. did. Example 1
Five pieces were placed in a mold similar to the one above, and a single plate was placed over the top. This mold is pressed 150 times from the top and bottom using a press machine.
It was pressed under a pressure of Kg/cm 2 , heated steam was directly introduced into the jacket of the press, and the mold side temperature was heated to 170° C. and held for 10 minutes. Thereafter, the heated steam from the press was removed, and water was added and held for 5 minutes, resulting in a mold temperature of 65°C. After that, when the press was released, the external dimensions were 3.6 x 68 x 150 cm.
A foam with a density of 0.063 was obtained. This primary foam was placed in a separate mold with dimensions of 3.8 x 90 x 180 cm, and a pressure of 10 Kg/cm 2 was applied using a press, and the mold was reheated at 120° C. for 12 minutes to complete foaming. Thereafter, the mold was released, and a foam product with external dimensions of 4.1 x 110 x 215 cm and a density of 0.024 (expansion ratio of 42 times) and good appearance and properties was obtained.
図は各種気泡体の応力−たわみ曲線（Ｓ−Ｓ曲
線）を示したもので、１は本発明品、２はポリス
チレン発泡体、３はポリウレタン発泡体。
The figure shows the stress-deflection curves (SS curves) of various foams, where 1 is a product of the present invention, 2 is a polystyrene foam, and 3 is a polyurethane foam.
Claims (1)
100重量部に対し発泡剤20〜80重量部、架橋剤1.0
〜5.0重量部をそれぞれ添加混ねりした発泡体原
料を充填し、その後この成形型を被蓋で強固に閉
塞し、ついでこれを加熱して発泡剤の１部を分解
させ、ここに一次発泡体を成形し、しかるのちこ
れを型内に保持したままで発泡時の温度よりも70
〜120℃低い温度まで冷却してから脱型し、さら
にこの一次発泡成形体を別の成形型に再び充填
し、再度加熱して発泡を最終的に完了させたのち
脱型することを特徴とする低密度合成樹脂発泡体
の製造法。1 Inside the mold, ethylene-vinyl acetate copolymer
20 to 80 parts by weight of blowing agent, 1.0 parts by weight of crosslinking agent per 100 parts by weight
~5.0 parts by weight of each foam raw material is added and mixed, and then the mold is tightly closed with a cover, and then heated to decompose a part of the foaming agent, and the primary foam is then added. Then, while holding it in the mold, the temperature was raised to 70℃ higher than the temperature at the time of foaming.
It is characterized by being cooled to a temperature of ~120°C and then demolded, and then this primary foamed molded product is again filled into another mold, heated again to finally complete foaming, and then demolded. A method for producing low-density synthetic resin foam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10006680A JPS5725925A (en) | 1980-07-22 | 1980-07-22 | Manufacture of low density synthetic resin foamed body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10006680A JPS5725925A (en) | 1980-07-22 | 1980-07-22 | Manufacture of low density synthetic resin foamed body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5725925A JPS5725925A (en) | 1982-02-10 |
| JPH032657B2 true JPH032657B2 (en) | 1991-01-16 |
Family
ID=14264086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10006680A Granted JPS5725925A (en) | 1980-07-22 | 1980-07-22 | Manufacture of low density synthetic resin foamed body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5725925A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016067472A1 (en) * | 2014-10-31 | 2016-05-06 | 株式会社小松製作所 | Hydraulic pump/motor |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8823484D0 (en) * | 1988-10-06 | 1988-11-16 | Foster R J | Method of producing foamed product |
| EP0485639B1 (en) * | 1990-11-10 | 1995-03-29 | Kuo-Nan Yang | EVA insole manufacturing process |
| US5318645A (en) * | 1993-02-22 | 1994-06-07 | Yang Kuo Nan | EVA insole manufacturing process |
| US5308420A (en) * | 1993-02-22 | 1994-05-03 | Yang Kuo Nan | EVA insole manufacturing process |
| BR9404462A (en) * | 1994-11-10 | 1997-03-04 | Reynaldo Oscar Oliver Silva | Process for the production of articles in expanded cross-linked polymeric materials and the product thus obtained |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS528348A (en) * | 1975-07-07 | 1977-01-22 | Denshi Giken Kk | Recreational device |
-
1980
- 1980-07-22 JP JP10006680A patent/JPS5725925A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS528348A (en) * | 1975-07-07 | 1977-01-22 | Denshi Giken Kk | Recreational device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016067472A1 (en) * | 2014-10-31 | 2016-05-06 | 株式会社小松製作所 | Hydraulic pump/motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5725925A (en) | 1982-02-10 |
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