JPH10310654A - Production of open-celled polyolefin-based resin foam - Google Patents
Production of open-celled polyolefin-based resin foamInfo
- Publication number
- JPH10310654A JPH10310654A JP12077397A JP12077397A JPH10310654A JP H10310654 A JPH10310654 A JP H10310654A JP 12077397 A JP12077397 A JP 12077397A JP 12077397 A JP12077397 A JP 12077397A JP H10310654 A JPH10310654 A JP H10310654A
- Authority
- JP
- Japan
- Prior art keywords
- foam
- weight
- parts
- agent
- polyolefin 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、エチレン−酢酸ビ
ニル共重合体等のポリオレフィン系樹脂でなる発泡体を
形成するポリオレフィン系樹脂連続気泡発泡体の製造方
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polyolefin resin open cell foam for forming a foam comprising a polyolefin resin such as an ethylene-vinyl acetate copolymer.
【０００２】[0002]
【従来の技術】ポリオレフィン系樹脂連続気泡発泡体
は、通気性、吸水性、耐候性、焼却時の耐環境性等に優
れており、シール材、ガスケット、緩衝材、雑貨等の用
途に広く利用されている。このポリオレフィン系樹脂連
続気泡発泡体を製造する方法としては、独立気泡を形成
した後、ロール延伸法や、ピンによる機械的作用により
気泡膜を破り、連続気泡化する方法、または、発泡時に
気泡膜を破り、連続気泡を形成する方法が提案されてい
る。また、発泡時に気泡膜を破り、連続気泡を形成する
方法として、特公昭６０−４９６５７号公報には、エチ
レン系樹脂１００重量部に対し、発泡剤１〜２０重量
部、架橋剤の有機過酸化物０．３〜１０重量部からなる
架橋発泡組成物に、三官能モノマー０．１〜１０重量
部、シリコーン油０．１〜５重量部を添加すること、及
び有機過酸化物の１０分間半減期温度（Ｔｐ）が１００
〜１７０℃であり、発泡剤の発泡温度（Ｔｆ）が９０〜
１６０℃であって、かつ−１０℃≦Ｔｐ−Ｔｆ≦５０℃
を満足することからなるポリオレフィン系樹脂連続気泡
発泡体の製造法が提案されている。2. Description of the Related Art Open-celled polyolefin resin foams are excellent in air permeability, water absorption, weather resistance, environmental resistance during incineration, etc., and are widely used for sealing materials, gaskets, cushioning materials, miscellaneous goods, and the like. Have been. As a method for producing this polyolefin-based resin open-cell foam, after forming closed cells, a roll stretching method, a method in which a cell film is broken by mechanical action with a pin to form open cells, or a cell film during foaming And a method of forming open cells has been proposed. Japanese Patent Publication No. 60-49657 discloses a method for breaking open a cell membrane at the time of foaming to form open cells. For example, 1 to 20 parts by weight of a foaming agent and 100 parts by weight of an organic peroxide of a crosslinking agent are used for 100 parts by weight of an ethylene resin. 0.1 to 10 parts by weight of a trifunctional monomer and 0.1 to 5 parts by weight of a silicone oil to a crosslinked foaming composition comprising 0.3 to 10 parts by weight of an organic peroxide, and halving the organic peroxide for 10 minutes Initial temperature (Tp) is 100
170 ° C., and the foaming temperature (Tf) of the foaming agent is 90-
160 ° C. and −10 ° C. ≦ Tp−Tf ≦ 50 ° C.
A method for producing a polyolefin-based resin open-cell foam which satisfies the following is proposed.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら前記公報
記載の発明にあっては、架橋剤の１０分間半減期温度よ
り発泡剤の発泡温度が低いか同じ場合に、常圧下で加熱
すると発泡が起こると殆ど同時にあるいは、僅かに後か
ら架橋が始まり緩やかに架橋が進行し、発泡が完了して
からあるいは、発泡が完了する直前に架橋密度が急激に
上昇してしまうため発生ガスの逸散が抑えられ、結果と
して発泡倍率が上がらず、ベタツキが生じ、発泡体の外
観が著しく損なうという問題点があった。However, in the invention described in the above publication, when the foaming temperature of the foaming agent is lower than or equal to the half-life temperature of the crosslinking agent for 10 minutes, the foaming occurs when heated under normal pressure. Cross-linking starts almost simultaneously or slightly later and the cross-linking proceeds slowly, and after the foaming is completed or immediately before the foaming is completed, the cross-linking density rapidly increases, so that the escape of generated gas is suppressed. As a result, there was a problem that the expansion ratio did not increase, stickiness occurred, and the appearance of the foam was significantly impaired.
【０００４】そこで、本発明は、上述の問題点に鑑み、
発泡剤の分解温度を上げることにより、架橋と発泡の温
度バランスが良好となり、高倍率で発泡体の外観が良好
であるポリオレフィン系樹脂連続気泡発泡体の製造法を
提供することを目的とする。Accordingly, the present invention has been made in view of the above problems,
An object of the present invention is to provide a method for producing a polyolefin-based resin open-cell foam in which the temperature of cross-linking and foaming is improved by increasing the decomposition temperature of the foaming agent, and the appearance of the foam is good at high magnification.
【０００５】[0005]
【課題を解決するための手段】上述の目的を達成するた
めに本発明においては、熱分解型の化学発泡剤として熱
分解温度が１５０〜１８０℃の範囲に入る化学発泡剤を
使用し、尚、且つ、１０分間半減期温度が１４０〜１６
０℃である有機過酸化物架橋剤の組み合わせにより、架
橋を進行させてから発泡を開始する方法であって、さら
に気泡膜強度調整剤、無機物粉末を添加することによ
り、気泡膜強度を強過ぎることなく、適度な気泡膜強度
を有しながら、破泡し易くしたことを特徴とするポリオ
レフィン系樹脂連続気泡発泡体の製造方法に関する。In order to achieve the above-mentioned object, the present invention uses a chemical foaming agent having a thermal decomposition temperature in the range of 150 to 180 ° C. as a thermal decomposition type chemical foaming agent. And a half-life temperature of 140 to 16 for 10 minutes.
This is a method of starting foaming after promoting crosslinking by a combination of an organic peroxide crosslinking agent at 0 ° C., and further adding a foam film strength modifier and an inorganic powder to make the foam film strength too strong. The present invention relates to a method for producing an open-cell foam of a polyolefin-based resin, characterized in that the foam is easily broken while having an appropriate foam film strength without using the same.
【０００６】[0006]
【発明の実施の形態】本発明で使用されるポリオレフィ
ン系樹脂とは、エチレン−酢酸ビニル共重合体が主であ
り、低密度ポリエチレン、中密度ポリエチレン、綿状低
密度ポリエチレン等を添加することはできるが、その配
合比率は、エチレン−酢酸ビニル共重合体が７０〜１０
０重量部で、その他エチレン系樹脂は、３０〜０重量部
に限定される。特に、エチレン−酢酸ビニル共重合体
は、ＭＩが５〜５０ｇ／１０分、ＶＡが５〜３０％の範
囲のものが良好であり、好ましくは、ＭＩが１０〜３０
ｇ／１０分、ＶＡが１０〜２５％の範囲が好ましい。こ
れは、ＭＩが５ｇ／１０分さらにＶＡが５％以下である
と、樹脂の柔軟性がないため、いくら気泡膜強度調整剤
を添加しても気泡膜強度が強くなり過ぎて、常圧下で加
熱し、発泡した発泡体は連続気泡より独立気泡の方が比
率が高く、連続気泡の特徴である吸水量、ヘタリ復元性
が著しく劣った発泡体となってしまう。DETAILED DESCRIPTION OF THE INVENTION The polyolefin resin used in the present invention is mainly an ethylene-vinyl acetate copolymer, and low-density polyethylene, medium-density polyethylene, cotton-like low-density polyethylene and the like can be added. However, the mixing ratio of the ethylene-vinyl acetate copolymer is 70 to 10
0 parts by weight, and other ethylene resins are limited to 30 to 0 parts by weight. In particular, the ethylene-vinyl acetate copolymer preferably has an MI of 5 to 50 g / 10 min and a VA of 5 to 30%, and preferably has an MI of 10 to 30%.
g / 10 minutes, VA is preferably in the range of 10 to 25%. This is because if the MI is 5 g / 10 min and the VA is 5% or less, the resin is not flexible, so that even if the foam film strength modifier is added, the foam film strength becomes too strong, and the The ratio of closed cells to heated foamed foam is higher than that of open cells, resulting in a foam having extremely poor water absorption and settling resilience, which are characteristics of open cells.
【０００７】このポリオレフィン系樹脂は、化学発泡
剤、架橋剤、気泡膜強度調整剤、破泡剤の他、必要に応
じて架橋効率を高めるための架橋助剤、充填剤他等を加
えることができる。The polyolefin resin may contain a chemical foaming agent, a cross-linking agent, a cell membrane strength modifier, a foam breaking agent, and, if necessary, a cross-linking auxiliary agent for increasing the cross-linking efficiency, a filler, and the like. it can.
【０００８】架橋剤としては、例えば、ｔ−ブチルクミ
ルパーオキサイド、ジクミルパーオキサイド、２，５ジ
メチル−２，５ジ（ｔ−ブチルパーオキシ）ヘキサン等
の１０分間半減期温度が１４０〜１６０℃である有機過
酸化物架橋剤を用いることができ、添加割合は、樹脂成
分の合計量１００重量部に対して、０．２〜５重量部で
ある。この割合が０．２重量部未満であると架橋が不十
分で均一な発泡体が得られず、５重量部を越えると架橋
密度が上がり過ぎ、発泡体に耳割れ、気泡粗大等が起こ
り、良好な発泡体が得られない。As the crosslinking agent, for example, t-butylcumyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane and the like have a 10-minute half-life temperature of 140 to 160. It is possible to use an organic peroxide crosslinking agent having a temperature of 0 ° C, and the addition ratio is 0.2 to 5 parts by weight based on 100 parts by weight of the total amount of the resin components. If this proportion is less than 0.2 parts by weight, crosslinkage is insufficient and a uniform foam cannot be obtained, and if it exceeds 5 parts by weight, the crosslink density becomes excessively high, and the foam has edge cracks, coarse cells, etc., Good foam cannot be obtained.
【０００９】化学発泡剤としては、例えば、アゾジカル
ボンアミド、ジニトロソペンタメチレンテトラミン、ベ
ンゼンスルホニルヒドラジド等を用いることができる
が、熱分解温度が１５０〜１８０℃の範囲にはいる発泡
剤に限定される。発泡剤の添加量は、所望の発泡倍率に
応じて適宜定めることができるが、樹脂成分の合計量１
００重量部に対して１〜２０重量部の範囲内で使用され
る。As the chemical foaming agent, for example, azodicarbonamide, dinitrosopentamethylenetetramine, benzenesulfonylhydrazide and the like can be used, but it is limited to a foaming agent having a thermal decomposition temperature in the range of 150 to 180 ° C. You. The amount of the foaming agent to be added can be appropriately determined according to the desired expansion ratio.
It is used in the range of 1 to 20 parts by weight with respect to 00 parts by weight.
【００１０】気泡膜強度調整剤としては、従来、整泡剤
と称する化合物、例えば、シリコーン油等を用いること
ができる。シリコーン油の中でも、表面張力の大きいも
の程、気泡微細になりやすい。ポリオレフィン系樹脂に
対する添加量は、樹脂成分の合計量１００重量部に対し
て、０．１〜５重量部が好ましい。０．１重量部より少
ないと、均一な発泡体が得られず、５重量部より多いと
ブリード現象が生じる。As the foam film strength adjusting agent, a compound conventionally referred to as a foam stabilizer, for example, silicone oil can be used. Among silicone oils, those having a higher surface tension are more likely to become fine bubbles. The amount added to the polyolefin resin is preferably 0.1 to 5 parts by weight based on 100 parts by weight of the total amount of the resin components. If the amount is less than 0.1 part by weight, a uniform foam cannot be obtained. If the amount is more than 5 parts by weight, a bleeding phenomenon occurs.
【００１１】破泡剤としては、タルクのような角状物で
ある無機物粉末や、ウィスカーやミルドァイバーのよう
な針状物が、気泡膜を発泡工程中で破る作用があるもの
と推定され、効果的である。破泡剤の添加量は、樹脂成
分の合計量１００重量部に対して、１０〜３０重量部が
好ましい。As the foam breaking agent, it is presumed that inorganic powder such as talc or other inorganic substances or needles such as whiskers or mill fibers have an action of breaking the foam film during the foaming process. It is a target. The addition amount of the foaming agent is preferably 10 to 30 parts by weight based on 100 parts by weight of the total amount of the resin component.
【００１２】架橋助剤としては、キノンジオキシム、ト
リメチロールプロパントリメタクリレート、トリメチロ
ールプロパントリアクリレート等を挙げることができ
る。これらの架橋助剤の添加割合は、所望の架橋度合い
等に応じて適宜定めることができるが、樹脂成分の合計
量１００重量部に対して、通常、０．１〜３重量部の範
囲が好ましい。Examples of the crosslinking aid include quinone dioxime, trimethylolpropane trimethacrylate, and trimethylolpropane triacrylate. The addition ratio of these crosslinking aids can be appropriately determined according to the desired degree of crosslinking and the like, but is usually preferably in the range of 0.1 to 3 parts by weight based on 100 parts by weight of the total amount of the resin components. .
【００１３】各種添加剤としては、例えば、酸化防止
剤、重合調整剤、帯電防止剤、顔料、発泡助剤等のもの
がある。The various additives include, for example, antioxidants, polymerization regulators, antistatic agents, pigments, foaming aids and the like.
【００１４】なお、上述した有機過酸化物架橋剤を用い
る化学架橋法の場合、発泡性シートのゲル分率（架橋
度）が４０〜６０％となるように架橋剤、架橋助剤等の
添加剤量を調整することが好ましい。ゲル分率が過少で
あるとベタツキが生じて、耐熱性を得ることができず発
泡時の気泡膜強度が不十分で高発泡化が図れない。逆に
過大であると気泡膜強度が強過ぎて、独立気泡化が顕著
となる。また、他の架橋法、例えばシラン架橋法や電子
線等の放射線照射架橋法を用いることもできる。In the case of the chemical crosslinking method using the above-mentioned organic peroxide crosslinking agent, the addition of a crosslinking agent, a crosslinking assistant, etc. is carried out so that the gel fraction (crosslinking degree) of the foamable sheet becomes 40 to 60%. It is preferable to adjust the dosage. If the gel fraction is too small, stickiness occurs, heat resistance cannot be obtained, and the foam film strength at the time of foaming is insufficient, so that high foaming cannot be achieved. Conversely, if it is excessively large, the strength of the cell membrane is too strong, and the formation of closed cells becomes remarkable. Further, other crosslinking methods, for example, a silane crosslinking method or a radiation irradiation crosslinking method such as an electron beam can also be used.
【００１５】材料の混練法としては、ポリオレフィン系
樹脂、架橋剤、発泡剤、気泡膜強度調整剤、破泡剤及び
所望の各種添加剤を架橋剤の分解温度または、発泡剤の
分解温度未満で、バンバリーミキサー、ロール、押出機
（単軸、多軸）等を用いて溶融混練し、最終的にダイス
を介してシート形状に成形する。As a method for kneading the materials, a polyolefin resin, a cross-linking agent, a foaming agent, a cell membrane strength modifier, a foam-breaking agent and various additives are added at a decomposition temperature of the cross-linking agent or lower than the decomposition temperature of the foaming agent. The mixture is melt-kneaded using a Banbury mixer, a roll, an extruder (single-screw, multi-screw) or the like, and finally formed into a sheet shape through a die.
【００１６】[0016]
【実施例】次に、本発明に係わるポリオレフィン系樹脂
連続気泡発泡体の製造方法の実施形態を実施例に基づき
説明する。 実施例１ 次記の表１に示すように、酢酸ビニル成分が１３重量
％、ＭＩが２０ｇ／１０分エチレン−酢酸ビニル共重合
体１００重量部、架橋剤としてジクミルパーオキサイド
０．６重量部、発泡剤としてアゾジカルボンアミド系発
泡剤（熱分解温度；１６９℃ 永和化成工業（株）製）
２０重量部、気泡膜強度調整剤として、シリコーン系界
面活性剤０．５重量部、破泡剤として、タルクを１０重
量部、酸化防止剤として、イルガノックス１０１０を
０．１重量部、架橋助剤として、トリメチロールプロパ
ントリメタクリレートを０．１重量部となるように配合
し、ＫＣＭ混練装置を用いて１２０℃で混練した後、外
径約５ｍｍのペレットを作製した。次に、この方法によ
って得られたペレットを、スクリュー径９０ｍｍの単軸
押出機のホッパーに投入し、シートダイを用いて厚み約
２．５ｍｍで樹脂及び発泡剤の分散性が良好なシート
（幅、４００ｍｍ）を成形した。この時の押出量は、５
０Ｋｇ／Ｈｒであった。 （発泡性シートの作製条件） スクリュー仕様 ：Ｌ／Ｄ；２６ スクリュー回転数：５０ｒｐｍ シリンダー温度 ：C1/C2/C3/C4/C5；95/105/113/110/1
00℃ アダプター温度 ：ＡＤ；１１０℃ ダイス温度 ：D1/D2/D3；１１２／１１０／１１０Next, an embodiment of the method for producing a polyolefin resin open cell foam according to the present invention will be described based on examples. Example 1 As shown in Table 1 below, a vinyl acetate component was 13% by weight, an MI was 20 g / 10 minutes, 100 parts by weight of an ethylene-vinyl acetate copolymer, and 0.6 parts by weight of dicumyl peroxide was used as a crosslinking agent. An azodicarbonamide-based blowing agent as a blowing agent (thermal decomposition temperature: 169 ° C, manufactured by Eiwa Chemical Co., Ltd.)
20 parts by weight, 0.5 part by weight of a silicone surfactant as a foam film strength modifier, 10 parts by weight of talc as a foam breaker, 0.1 part by weight of Irganox 1010 as an antioxidant, As an agent, trimethylolpropane trimethacrylate was blended in an amount of 0.1 part by weight, kneaded at 120 ° C. using a KCM kneading apparatus, and pellets having an outer diameter of about 5 mm were produced. Next, the pellets obtained by this method are put into a hopper of a single-screw extruder having a screw diameter of 90 mm, and a sheet (width, 400 mm). The extrusion rate at this time is 5
It was 0 Kg / Hr. (Production conditions of foamable sheet) Screw specification: L / D; 26 Screw rotation speed: 50 rpm Cylinder temperature: C1 / C2 / C3 / C4 / C5; 95/105/113/110/1
00 ° C Adapter temperature: AD; 110 ° C Dice temperature: D1 / D2 / D3; 112/110/110
【００１７】続いて、押出成形して得られたシートをテ
フロンシートからなる搬送材と共に、２００〜２３０℃
の熱風式加熱炉に入れ、約８ｍ／分のライン速度で加熱
し発泡させた後、この発泡体を十分冷却した後、発泡倍
率約２７倍、吸水量０．４３（ｇ／ｃｍ ）でフクレ、
凹凸等がない外観が良好な発泡体を得た。得られた発泡
体の主な特性を表−１に示す。 実施例２ 発泡剤の熱分解温度が１５０℃の発泡剤を用いた以外、
実施例１と同様にしてポリオレフィン発泡体を得た。得
られた発泡体の主な特性を表−１に示す。 実施例３ 破泡剤として、タルクを２０重量部添加した以外、実施
例１と同様にしてポリオレフィン発泡体を得た。得られ
た発泡体の主な特性を表−１に示す。 実施例４ 破泡剤として、ホウ酸アルミニウムウィスカーを用いた
以外、実施例１と同様にしてポリオレフィン発泡体を得
た。得られた発泡体の主な特性を表−１に示す。 実施例５ 実施例１のエチレン−酢酸ビニル共重合体８０重量部に
対して、低密度ポリエチレンを２０重量部混合した以
外、実施例１と同様にしてポリオレフィン発泡体を得
た。得られた発泡体の主な特性を表−１に示す。 実施例６ ＭＩが２０ｇ／１０分で、ＶＡ分が２０重量％のエチレ
ン−酢酸ビニル共重合体を用いた以外、実施例１と同様
して、ポリオレフィン発泡体を得た。得られた発泡体の
主な特性を表−１に示す。 比較例１ ＭＩが２０ｇ／１０分で、ＶＡ分が２８重量％のエチレ
ン−酢酸ビニル共重合体を用いた以外、実施例１と同様
して、ポリオレフィン発泡体を得た。得られた発泡体
は、実施例には表れなかった表面にフクレが発生し、ま
た、実施例に比べ、発泡倍率、吸水量が劣っていた。得
られた発泡体の主な特性を表−１に示す。 比較例２ ＭＩが３ｇ／１０分で、ＶＡ分が５重量％のエチレン−
酢酸ビニル共重合体を用いた以外、実施例１と同様し
て、ポリオレフィン発泡体を得た。得られた発泡体は、
実施例には表れなかった表面に凹凸が発生し、また、実
施例に比べ、発泡倍率、吸水量が劣っていた。特に、吸
水量は、殆どなく独立気泡発泡体であった。得られた発
泡体の主な特性を表−１に示す。なお、本発明のポリオ
レフィン系樹脂連続気泡発泡体の製造方法を、上述のよ
うな実施例及び比較例を挙げて説明したが、これらの実
施例に限定されるものではない。Subsequently, the sheet obtained by extrusion molding is placed at 200 to 230 ° C. together with a carrier made of Teflon sheet.
After heating and foaming at a line speed of about 8 m / min, the foam was sufficiently cooled, and then foamed at a foaming ratio of about 27 and a water absorption of 0.43 (g / cm 2). ,
A foam having good appearance without irregularities was obtained. Table 1 shows the main characteristics of the obtained foam. Example 2 Except for using a foaming agent having a thermal decomposition temperature of 150 ° C.
A polyolefin foam was obtained in the same manner as in Example 1. Table 1 shows the main characteristics of the obtained foam. Example 3 A polyolefin foam was obtained in the same manner as in Example 1, except that 20 parts by weight of talc was added as a foam breaking agent. Table 1 shows the main characteristics of the obtained foam. Example 4 A polyolefin foam was obtained in the same manner as in Example 1, except that aluminum borate whiskers were used as a foam breaking agent. Table 1 shows the main characteristics of the obtained foam. Example 5 A polyolefin foam was obtained in the same manner as in Example 1 except that 20 parts by weight of low-density polyethylene was mixed with 80 parts by weight of the ethylene-vinyl acetate copolymer of Example 1. Table 1 shows the main characteristics of the obtained foam. Example 6 A polyolefin foam was obtained in the same manner as in Example 1 except that an ethylene-vinyl acetate copolymer having an MI of 20 g / 10 minutes and a VA of 20% by weight was used. Table 1 shows the main characteristics of the obtained foam. Comparative Example 1 A polyolefin foam was obtained in the same manner as in Example 1, except that an ethylene-vinyl acetate copolymer having an MI of 20 g / 10 minutes and a VA content of 28% by weight was used. In the obtained foam, blisters were generated on the surface which did not appear in the examples, and the foaming ratio and water absorption were inferior to the examples. Table 1 shows the main characteristics of the obtained foam. Comparative Example 2 Ethylene having an MI of 3 g / 10 min and a VA of 5 wt%
A polyolefin foam was obtained in the same manner as in Example 1 except that a vinyl acetate copolymer was used. The resulting foam is
Irregularities occurred on the surface which did not appear in the examples, and the foaming ratio and water absorption were inferior to the examples. In particular, there was almost no water absorption, and it was a closed-cell foam. Table 1 shows the main characteristics of the obtained foam. The method for producing a polyolefin-based resin open-cell foam of the present invention has been described with reference to the above-described examples and comparative examples, but the present invention is not limited to these examples.
【００１８】[0018]
【表１】 [Table 1]
【００１９】[0019]
【発明の効果】本発明によれば、エチレン−酢酸ビニル
共重合体を含むポリオレフィン系樹脂１００重量部、発
泡剤として熱分解型の化学発泡剤を１〜２０重量部、有
機過酸化物架橋剤を０．２〜５重量部からなる架橋発泡
組成物に、気泡膜強度調整剤０．１〜５重量部及び破泡
剤として、無機物粉末１０〜３０重量部を添加すること
により、高倍率で、フクレや凹凸のない外観良好なポリ
オレフィン系樹脂連続気泡発泡体を製造することができ
る。この連続気泡発泡体は、連続気泡の特徴である吸水
量が極めて高く、また、圧縮力開放後の復元性が良い。
従って、本発明の製造方法により得られた連続気泡発泡
体は、シール材、パッキング材、吸油材、緩衝材等に好
ましく用いることができる。According to the present invention, 100 parts by weight of a polyolefin resin containing an ethylene-vinyl acetate copolymer, 1 to 20 parts by weight of a thermal decomposition type chemical blowing agent as a blowing agent, an organic peroxide crosslinking agent By adding 0.1 to 5 parts by weight of a cell membrane strength modifier and 10 to 30 parts by weight of an inorganic powder as a foam breaking agent to a crosslinked foaming composition comprising 0.2 to 5 parts by weight, It is possible to produce a polyolefin resin open cell foam having good appearance without swelling and unevenness. This open-cell foam has an extremely high water absorption, which is a characteristic of open cells, and has good resilience after releasing the compressive force.
Therefore, the open-cell foam obtained by the production method of the present invention can be preferably used as a sealing material, a packing material, an oil absorbing material, a cushioning material, and the like.
Claims (2)
オレフィン系樹脂１００重量部、熱分解型の化学発泡剤
を１〜２０重量部、有機過酸化物架橋剤を０．２〜５重
量部からなる架橋発泡組成物に、気泡膜強度調整剤０．
１〜５重量部及び破泡剤として無機物粉末１０〜３０重
量部を添加して得た成形体を常圧下に加熱して架橋発泡
させることを特徴とするポリオレフィン系樹脂連続気泡
発泡体の製造方法。1. A polyolefin resin containing an ethylene-vinyl acetate copolymer in an amount of 100 parts by weight, a thermal decomposition type chemical blowing agent in an amount of 1 to 20 parts by weight, and an organic peroxide crosslinking agent in an amount of 0.2 to 5 parts by weight. To the crosslinked foamed composition of the present invention.
A method for producing an open-cell foam of a polyolefin-based resin, wherein a molded article obtained by adding 1 to 5 parts by weight and 10 to 30 parts by weight of an inorganic powder as a foam breaking agent is crosslinked and foamed by heating under normal pressure. .
系樹脂の溶融温度以上の温度に熱分解開始温度を有する
ものである請求項１記載のポリオレフィン系樹脂連続気
泡発泡体の製造方法。2. The method for producing an open-cell polyolefin resin foam according to claim 1, wherein the thermal decomposition type chemical foaming agent has a thermal decomposition initiation temperature at a temperature not lower than the melting temperature of the polyolefin resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12077397A JPH10310654A (en) | 1997-05-12 | 1997-05-12 | Production of open-celled polyolefin-based resin foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12077397A JPH10310654A (en) | 1997-05-12 | 1997-05-12 | Production of open-celled polyolefin-based resin foam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10310654A true JPH10310654A (en) | 1998-11-24 |
Family
ID=14794653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12077397A Pending JPH10310654A (en) | 1997-05-12 | 1997-05-12 | Production of open-celled polyolefin-based resin foam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10310654A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1491574A1 (en) * | 2003-06-25 | 2004-12-29 | Hyung Jun Park | Blown, foamed, crosslinked ethylene vinyl acetate based film, shoe components using the same, and method for manufacturing thereof |
| JP2011208045A (en) * | 2010-03-30 | 2011-10-20 | Nitto Denko Corp | Foaming composition for filling, foaming member for filling and foam for filling |
| WO2013077390A1 (en) * | 2011-11-24 | 2013-05-30 | スズキ株式会社 | Molding die and molding method |
-
1997
- 1997-05-12 JP JP12077397A patent/JPH10310654A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1491574A1 (en) * | 2003-06-25 | 2004-12-29 | Hyung Jun Park | Blown, foamed, crosslinked ethylene vinyl acetate based film, shoe components using the same, and method for manufacturing thereof |
| JP2011208045A (en) * | 2010-03-30 | 2011-10-20 | Nitto Denko Corp | Foaming composition for filling, foaming member for filling and foam for filling |
| US8673423B2 (en) | 2010-03-30 | 2014-03-18 | Nitto Denko Corporation | Foaming composition for filling, foaming member for filling, and foam for filling |
| WO2013077390A1 (en) * | 2011-11-24 | 2013-05-30 | スズキ株式会社 | Molding die and molding method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0238100B2 (en) | ||
| CN110655702A (en) | Preparation method of polyethylene foam material and polyethylene foam material prepared by same | |
| JP2001348452A (en) | Polyolefinic resin foam and manufacturing method therefor | |
| JPH10310654A (en) | Production of open-celled polyolefin-based resin foam | |
| JPS6049657B2 (en) | Method for producing open-cell crosslinked ethylene resin foam | |
| JP2673310B2 (en) | Method for producing polyethylene resin foam having open cells | |
| JPH059325A (en) | Production of crosslinked foam of olefinic elastomer composition | |
| JP2005133045A (en) | Foam-forming resin composition, foamed body and method for forming the same | |
| JPH07330935A (en) | Crystalline polyolefin foam | |
| JPH08109277A (en) | Cross-linked polyolefin resin foam | |
| JP4009774B2 (en) | Cross-linked polyethylene resin foam and production method thereof | |
| JP3047623B2 (en) | Composition for crosslinked polyolefin resin foam | |
| JPH07138397A (en) | Foamed propylene resin molding and its preparation | |
| JPH0735446B2 (en) | Composition for open-cell olefin resin foam | |
| JPH04342743A (en) | Composition for open-cell type propylene-based resin foam | |
| JPS6315834A (en) | Polyolefin resin foam and composition therefor | |
| JP3763879B2 (en) | Polyolefin resin cross-linked foam | |
| JP3565791B2 (en) | Method for producing heat-resistant polyethylene foam | |
| JP3306189B2 (en) | Olefin resin composition for foaming | |
| JPS63159450A (en) | Production of expandable ethylene resin bead | |
| JPH04363338A (en) | Production of polyolefin-crosslinked foamed product | |
| JPH07157586A (en) | Compression-resistant cross-linked resin foam | |
| JPH08311229A (en) | Polyolefin resin foam | |
| JPS6153015A (en) | Manufacture of polyolefin cellular body | |
| JPS6264530A (en) | Manufacture of open-cell foam of polyethylene or ethylene copolymer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Effective date: 20040510 Free format text: JAPANESE INTERMEDIATE CODE: A621 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20060315 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20060323 |
|
| A02 | Decision of refusal |
Effective date: 20060727 Free format text: JAPANESE INTERMEDIATE CODE: A02 |