JPH02194037A - Open-cell polyethylene resin foam and its production - Google Patents
Open-cell polyethylene resin foam and its productionInfo
- Publication number
- JPH02194037A JPH02194037A JP1276989A JP1276989A JPH02194037A JP H02194037 A JPH02194037 A JP H02194037A JP 1276989 A JP1276989 A JP 1276989A JP 1276989 A JP1276989 A JP 1276989A JP H02194037 A JPH02194037 A JP H02194037A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- foam
- polyethylene resin
- polypropylene resin
- crosslinkable
- 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.)
- Granted
Links
- 239000006260 foam Substances 0.000 title claims abstract description 57
- 229920013716 polyethylene resin Polymers 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229920005989 resin Polymers 0.000 claims abstract description 44
- 239000011347 resin Substances 0.000 claims abstract description 44
- -1 polypropylene Polymers 0.000 claims abstract description 43
- 239000004743 Polypropylene Substances 0.000 claims abstract description 40
- 229920001155 polypropylene Polymers 0.000 claims abstract description 39
- 238000004132 cross linking Methods 0.000 claims abstract description 7
- 239000004698 Polyethylene Substances 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- 238000005187 foaming Methods 0.000 claims description 12
- 239000004604 Blowing Agent Substances 0.000 claims description 7
- 150000001451 organic peroxides Chemical class 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 229920001519 homopolymer Polymers 0.000 abstract description 4
- 229920001684 low density polyethylene Polymers 0.000 abstract description 4
- 239000004702 low-density polyethylene Substances 0.000 abstract description 4
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 abstract description 4
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 abstract description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract 1
- 239000005977 Ethylene Substances 0.000 abstract 1
- 229920001577 copolymer Polymers 0.000 abstract 1
- 229940099514 low-density polyethylene Drugs 0.000 abstract 1
- 238000007906 compression Methods 0.000 description 28
- 230000006835 compression Effects 0.000 description 27
- 238000000034 method Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 238000009408 flooring Methods 0.000 description 7
- 239000005038 ethylene vinyl acetate Substances 0.000 description 6
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 4
- 239000004088 foaming agent Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010097 foam moulding Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 description 1
- 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 1
- JHDREIKBEWQKRB-UHFFFAOYSA-N N',N',1-triphenylmethanesulfonohydrazide Chemical compound C1(=CC=CC=C1)N(NS(=O)(=O)CC1=CC=CC=C1)C1=CC=CC=C1 JHDREIKBEWQKRB-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005673 polypropylene based resin Polymers 0.000 description 1
- 229920005653 propylene-ethylene copolymer Polymers 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000007652 sheet-forming process Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
産 土の
本発明は、高い連続気泡率を有して吸音特性等に優れ、
しかも圧縮特性が良好なポリエチレン系樹脂発泡体およ
びその製造法に関する。[Detailed Description of the Invention] The present invention, which is produced using clay, has a high open cell ratio and excellent sound absorption properties.
Moreover, the present invention relates to a polyethylene resin foam having good compression properties and a method for producing the same.
災末段肢亙
近年、集合住宅等の木質床材の急速な普及に伴い、遮音
床材の開発が強く要望されている。In recent years, with the rapid spread of wooden flooring in housing complexes, there has been a strong demand for the development of sound-insulating flooring.
このような遮音床材においては、高い連続気泡率を有す
る発泡体を、床下地材として使用することが好ましい、
しかしながら、従来の連続気泡を有するポリオレフィン
発泡体は圧縮硬さが極端に低く、床下地材として使用す
るには実用的でなかった。この他にも、高い連続気泡率
と優れた圧縮特性を有する発泡体が望ま九ている分野は
多い。In such sound insulating flooring materials, it is preferable to use foam with a high open cell ratio as the flooring material.
However, conventional open-celled polyolefin foams have extremely low compression hardness, making them impractical for use as flooring materials. In addition, there are many other fields in which foams having a high open cell ratio and excellent compression properties are desired.
例えば、特公昭47−31695号公報には、圧縮率が
5%以上で、かつ圧縮回復率が85%以上を有する独立
気泡の架橋ポリオレフィン発泡体を先ず用意し、この発
泡体をガラス転移温度以下に冷却した後、圧縮して独立
気泡構造を破壊して連続気泡化せしめることが提案され
ている。For example, in Japanese Patent Publication No. 47-31695, a closed-cell crosslinked polyolefin foam having a compression rate of 5% or more and a compression recovery rate of 85% or more is first prepared, and this foam is heated to a temperature below the glass transition temperature. It has been proposed that the closed cell structure be destroyed by compression after cooling to open cells.
しかしこの方法により得られた発泡体は、弾性限界を越
えるような苛酷の圧縮工程を経るため、圧縮硬さが極端
に低下してしまう、さらに、工程が2段階となることか
ら、設備費および加工費の面でもコスト高になることは
否めなかった。However, the foam obtained by this method undergoes a severe compression process that exceeds its elastic limit, resulting in an extremely low compression hardness.Furthermore, since the process is a two-step process, equipment costs and It was undeniable that the processing costs would also be high.
また、特公昭55−42100号公報には、架橋性ポリ
オレフィン樹脂に、汎用のポリプロピレン製造時に副生
ずる無定形ポリプロピレン樹脂20〜60重量%、さら
に発泡剤、架橋剤を、発泡剤が分解しない温度で配合し
て発泡性組成物とし、これを−段加工、加熱プレス法で
発泡させて連続気泡発泡体を製造することが提案されて
いる。Furthermore, Japanese Patent Publication No. 55-42100 discloses that 20 to 60% by weight of an amorphous polypropylene resin, which is a by-product during the production of general-purpose polypropylene, and a blowing agent and a crosslinking agent are added to a crosslinkable polyolefin resin at a temperature at which the blowing agent does not decompose. It has been proposed to produce an open-cell foam by blending them into a foamable composition and foaming this by a step-processing or hot pressing method.
しかし、この方法により得られる発泡体は。However, the foam obtained by this method.
圧縮硬さが低い無定形ポリプロピレン樹脂を多量に含有
しているため、発泡体自体も圧縮硬さが著しく低く、用
途が限定されるものであった。Since it contains a large amount of amorphous polypropylene resin with low compression hardness, the foam itself also has extremely low compression hardness, which limits its uses.
さらには、ポリオレフィン樹脂と非架橋性の無定形ポリ
プロピレン樹脂とを発泡前工程のシート成形時に溶融混
合するため、発泡段階の気泡形成過程で特に重要となる
架橋に悪影響を及ぼし、均一な連続気泡を有する発泡体
の製造は困難であった。Furthermore, since polyolefin resin and non-crosslinkable amorphous polypropylene resin are melt-mixed during sheet molding in the pre-foaming process, crosslinking, which is particularly important in the cell formation process at the foaming stage, is adversely affected, and uniform open cells are not formed. It has been difficult to manufacture foams with
が しよ゛とする
本発明は、高い連続気泡率を有し、しかも圧縮特性に優
れたポリエチレン系樹脂発泡体を提供するものである。The present invention aims to provide a polyethylene resin foam having a high open cell ratio and excellent compression properties.
見匪立豊双
本発明のポリエチレン系樹脂発泡体は、(a)架橋性ポ
リエチレン系樹脂および(b)融点が架橋性ポリエチレ
ン系樹脂よりも20℃以上高く、かつ190℃以下であ
るポリプロピレン系樹脂を、(a)/[(a) + (
b)] = 40〜90重量%(b)/[(a) +
(b)] = 10〜60重量%の範囲で含み、かつ、
前記架橋性ポリエチレン系樹脂を架橋せしめるとともに
、連続気泡率が60〜90重量%であることを特徴とす
る。The polyethylene resin foam of the present invention includes (a) a crosslinkable polyethylene resin and (b) a polypropylene resin whose melting point is 20°C or more higher than the crosslinkable polyethylene resin and 190°C or lower. , (a)/[(a) + (
b)] = 40-90% by weight (b)/[(a) +
(b)]=contains in the range of 10 to 60% by weight, and
The crosslinkable polyethylene resin is crosslinked and has an open cell ratio of 60 to 90% by weight.
また、本発明のポリエチレン系樹脂発泡体の製造法は、
溶融した(a)架橋性ポリエチレン系樹脂と、熱分解型
発泡剤および有機過酸化物、さらには、(b)融点が架
橋性ポリエチレン系樹脂よりも20℃以上高く、かつ1
90℃以下である粉末状ポリプロピレン系樹脂を
(a)/[(a) + (b)] = 40〜90重量
%(b)/[(a) + (b)]ニ10〜60重量%
の範囲で混合し、(b)粉末状ポリプロピレン系樹脂を
非溶融状態にて均一に分散せしめ1次いで、加熱して(
a)架橋性ポリエチレン系樹脂を架橋させ1発泡させる
とともに、(b)粉末状ポリプロピレン系樹脂を溶融せ
しめることを特徴とする。Furthermore, the method for producing the polyethylene resin foam of the present invention includes:
The melted (a) crosslinkable polyethylene resin, the thermally decomposable blowing agent, and the organic peroxide;
Powdered polypropylene resin having a temperature of 90°C or less (a)/[(a) + (b)] = 40 to 90% by weight (b)/[(a) + (b)] 10 to 60% by weight
(b) to uniformly disperse the powdered polypropylene resin in an unmolten state;
It is characterized in that a) a crosslinkable polyethylene resin is crosslinked and foamed, and (b) a powdered polypropylene resin is melted.
以下、本発明についてさらに詳細に説明する。The present invention will be explained in more detail below.
本発明で用いられる(a)架橋性ポリエチレン系樹脂と
しては、低密度ポリエチレン、直鎖状低密度ポリエチレ
ン、高密度ポリエチレン、エチレン−酢酸ビニル共重合
体等のエチレン系共重合体などが挙げられ、これらは単
独でまたは2種以上併用して用いられる。この中でも、
特に低密度ポリエチレン、エチレン−酢酸ビニル共重合
体が好ましい。Examples of the crosslinkable polyethylene resin (a) used in the present invention include low density polyethylene, linear low density polyethylene, high density polyethylene, ethylene copolymers such as ethylene-vinyl acetate copolymer, etc. These may be used alone or in combination of two or more. Among these,
Particularly preferred are low density polyethylene and ethylene-vinyl acetate copolymer.
(b)ポリプロピレン系樹脂としては、−緒に用いられ
る架橋性ポリエチレン系樹脂よりも融点が20℃以上高
く、かつ融点が190℃以下のものが用いられ、具体例
としてプロピレンの結晶性ホモポリマー、プロピレンを
含むランダムコポリマー、ブロックコポリマー、グラフ
トコポリマー等が挙げられ、この中でも特に、プロピレ
ンの結晶性ホモポリマーが好ましい。(b) As the polypropylene resin, one whose melting point is 20°C or more higher than the crosslinkable polyethylene resin used above and 190°C or lower is used. Specific examples include crystalline homopolymer of propylene, Examples include random copolymers, block copolymers, and graft copolymers containing propylene, and among these, crystalline homopolymers of propylene are particularly preferred.
本発明において、(a)架橋性ポリエチレン系樹脂は、
(a)架橋性ポリエチレン系樹脂と(b)ポリプロピレ
ン系樹脂の合計量に対して40〜90重量%、好ましく
は60〜80重量%の量で用いられる。この量が40重
量%未満の場合には、発泡体の気泡状態が不均一で粗大
化するため、発泡体の圧縮硬さが著しく劣る。一方、9
0重量%を超えると連続気泡率が低すぎて好ましくない
。In the present invention, (a) the crosslinkable polyethylene resin is
It is used in an amount of 40 to 90% by weight, preferably 60 to 80% by weight based on the total amount of (a) crosslinkable polyethylene resin and (b) polypropylene resin. If this amount is less than 40% by weight, the cells of the foam will be non-uniform and coarse, resulting in significantly poor compression hardness of the foam. On the other hand, 9
If it exceeds 0% by weight, the open cell ratio will be too low, which is not preferable.
本発明で用いられる(b)ポリプロピレン系樹脂は、粉
体で用いられ、発泡前における溶融した(a)架橋性ポ
リエチレン系樹脂への均一分散工程においては粉体のま
まで溶融しないことが要求され、そのためには(a)架
橋性ポリエチレン系樹脂よりも20℃以上高い融点を有
することが必要であり、好ましくは30℃以上である。The (b) polypropylene resin used in the present invention is used in powder form, and is required to remain in powder form and not melt during the uniform dispersion process into the molten (a) crosslinkable polyethylene resin before foaming. For this purpose, it is necessary to have a melting point that is 20°C or more higher than (a) the crosslinkable polyethylene resin, preferably 30°C or more.
また、発泡成形工程においては、(b)ポリプロピレン
系樹脂が溶融することが必要であり、そのためには(b
)ポリプロピレン系樹脂の融点が190℃以下であるこ
とが必要である。粉末状ポリプロピレン系樹脂の平均粒
径は、300〜600μmであることが好適であり、さ
らに好ましくは450〜550μmである。平均粒径が
300μm未満の場合は、連続気泡率が高い発泡体を得
ることが困難となる。一方、平均粒径が600μmを越
えると、気泡状態が不均一で粗大化する傾向が強く、良
好な圧縮硬さを有する発泡体を得ることが困難となる。In addition, in the foam molding process, it is necessary to melt the (b) polypropylene resin, and for that purpose, (b)
) It is necessary that the melting point of the polypropylene resin is 190°C or lower. The average particle size of the powdered polypropylene resin is preferably 300 to 600 μm, more preferably 450 to 550 μm. When the average particle size is less than 300 μm, it becomes difficult to obtain a foam with a high open cell ratio. On the other hand, if the average particle size exceeds 600 μm, the cells tend to be non-uniform and coarse, making it difficult to obtain a foam having good compression hardness.
本発明のポリエチレン系樹脂発泡体は60〜90%の連
続気泡率を有し、また、1.2kg/aJ以上の圧縮硬
さを有することが望ましい、このような大きな連続気泡
率と圧縮硬さを有することにより、吸音特性等の優れた
性能が得られるとともに、強度的にも満足のゆくものが
得られる。The polyethylene resin foam of the present invention has an open cell ratio of 60 to 90%, and preferably has a compression hardness of 1.2 kg/aJ or more. By having this, not only excellent performance such as sound absorption properties can be obtained, but also satisfactory strength can be obtained.
本発明の発泡体では、その発泡成形に際して熱分解型発
泡剤が、また、架橋性ポリエチレン系樹脂の架橋に有機
過酸化物が用いられる。熱分解型発泡剤としては、アゾ
シカ−ボンアミド。In the foam of the present invention, a pyrolytic foaming agent is used during foam molding, and an organic peroxide is used for crosslinking the crosslinkable polyethylene resin. As a thermally decomposable blowing agent, azosicabonamide is used.
ジフェニルスルホン−3,3′−ジスルホヒドラジド、
ベンジルスルホン酸ジフェニルヒドラジド等が好ましい
。有機過酸化物としては、l。diphenylsulfone-3,3'-disulfohydrazide,
Benzylsulfonic acid diphenylhydrazide and the like are preferred. As an organic peroxide, l.
3−ビス(ターシャリブチルパーオキシイソプロピル)
ベンゼン、2,5−ジメチル−2,5−ジ(ターシャリ
ブチルパーオキシ)ヘキサン、ジクミルパーオキサイド
等が好適である。3-bis(tert-butylperoxyisopropyl)
Benzene, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, dicumyl peroxide and the like are preferred.
さらに連続気泡化した発泡体中には、炭酸カルシウム、
タルク、カーボンブラック等の無機物粉末、酸化防止剤
、着色剤1発泡助剤、架橋助剤、滑剤、難燃剤等の各種
添加剤を必要に応じて添加することができる。Furthermore, the open-celled foam contains calcium carbonate,
Various additives such as inorganic powders such as talc and carbon black, antioxidants, colorants, foaming aids, crosslinking aids, lubricants, and flame retardants may be added as necessary.
次に1本発明のポリエチレン系樹脂発泡体の製造法につ
いて述べる。Next, a method for producing a polyethylene resin foam according to the present invention will be described.
先ず、ポリエチレン系初詣、粉末状ポリプロピレン系樹
脂、熱分解型発泡剤および有機過酸化物、さらに必要に
応じて各種添加剤を、インターナルミキサー、バンバリ
ーミキサ−1加圧ニーダ−等の装置で均一に溶融混練し
、ついで、ロール、押出機等の装置で、シート状等の所
望の形状に成形する0例えば、−段加圧、加熱発泡の場
合は、厚さ0.5〜3.0mmの形状にシート化するこ
とが好ましい、この溶融混練−成形工程においては、粉
末ポリプロピレン系樹脂を、溶融することなく粉末状の
ままで均一に分散することが必要であり、具体的には、
例えば溶融混練工程を100〜140℃の温度で、シー
ト化等の成形工程を90〜130℃の温度で行うことが
好ましい。また、この条件は、発泡剤および架橋剤が実
質上非分解の温度条件である。First, polyethylene-based Hatsumode, powdered polypropylene-based resin, pyrolytic foaming agent, organic peroxide, and various additives as necessary are uniformly mixed in a device such as an internal mixer, Banbury mixer 1 pressure kneader, etc. The mixture is melt-kneaded and then formed into a desired shape such as a sheet using a device such as a roll or an extruder. In this melt-kneading-forming process, which is preferably formed into a sheet shape, it is necessary to uniformly disperse the powdered polypropylene resin in its powder form without melting it, and specifically,
For example, it is preferable that the melt-kneading step is carried out at a temperature of 100 to 140°C, and the forming process such as forming into a sheet is carried out at a temperature of 90 to 130°C. Moreover, this condition is a temperature condition in which the blowing agent and the crosslinking agent are substantially not decomposed.
次に、上記工程で調製した混合組成物を、例えば加圧プ
レス装置等を用いる一段加圧、加熱発泡方式により、温
度160〜190℃、圧力150〜200kg/aJで
、架橋発泡を行う。この−段加圧。Next, the mixed composition prepared in the above step is crosslinked and foamed at a temperature of 160 to 190° C. and a pressure of 150 to 200 kg/aJ, for example, by a one-stage pressurization and heat foaming method using a pressure press device or the like. This - stage pressurization.
加熱発泡により、−段の処理工程で、架橋性ポリエチレ
ン系樹脂が発泡、架橋するとともに、ポリプロピレン系
樹脂が溶融一体化し、本発明のポリエチレン系樹脂発泡
体が得られる。架橋発泡温度が160℃未満の場合は、
粉末状ポリプロピレン系樹脂が溶融せず、連続した気泡
の形成が困難となる。また、190℃を越えると、ポリ
エチレン系樹脂の気泡形成および粉末状ポリプロピレン
系樹脂の溶融が急激に進行するため。By heating and foaming, the crosslinkable polyethylene resin is foamed and crosslinked in the -stage treatment step, and the polypropylene resin is melted and integrated to obtain the polyethylene resin foam of the present invention. If the crosslinking and foaming temperature is less than 160°C,
Powdered polypropylene resin does not melt, making it difficult to form continuous bubbles. Furthermore, if the temperature exceeds 190°C, the formation of bubbles in the polyethylene resin and the melting of the powdered polypropylene resin rapidly proceed.
均一な連続気泡の形成が困難となり、得られる発泡体の
気泡が不均一で、かつ粗大化する。It becomes difficult to form uniform open cells, and the cells in the resulting foam become uneven and coarse.
このように製造されたポリエチレン系樹脂発泡体は、連
続気泡率が60〜90%であり、しかも圧縮硬さが1.
2kg/ff1以上で、吸音特性、圧縮特性ともに優れ
た発泡体である。The polyethylene resin foam produced in this way has an open cell ratio of 60 to 90% and a compression hardness of 1.
At 2 kg/ff1 or more, the foam has excellent sound absorption properties and compression properties.
粉末状ポリプロピレン系樹脂は、ポリエチレン系樹脂よ
りも融点が20℃以上高いため、シート化工程等におけ
る処理温度を適当な温度に設定することにより、ポリエ
チレン系樹脂のみが溶融し、粉末状ポリプロピレン系樹
脂はこれに溶融混和することなく、粉末のまま均一分散
される。次の一段加圧、加熱発泡工程においては、発泡
剤、架橋剤が先に、昇温下に例えば150℃付近より急
激に分解し、ポリエチレン系樹脂が架橋されるとともに
、まず独立気泡を形成する。Powdered polypropylene resin has a melting point 20°C higher than polyethylene resin, so by setting the processing temperature in the sheet forming process to an appropriate temperature, only the polyethylene resin melts and the powdered polypropylene resin melts. is uniformly dispersed as a powder without being melt-mixed. In the next one-stage pressurization and heat foaming process, the foaming agent and crosslinking agent first decompose rapidly from around 150°C under elevated temperature, and the polyethylene resin is crosslinked and first closed cells are formed. .
そして、160℃以上で粉末状ポリプロピレン系樹脂が
これら独立気泡の膜壁で溶融する。このポリプロピレン
系樹脂は非架橋性であるため、既に形成された気泡のガ
ス圧に抗しきれず、気泡が破壊されて連続気泡が形成さ
れるものと推定される。Then, at 160° C. or higher, the powdered polypropylene resin melts on the membrane walls of these closed cells. Since this polypropylene resin is non-crosslinkable, it is presumed that it cannot resist the gas pressure of the bubbles that have already been formed, and the bubbles are destroyed to form open cells.
また、気泡を連続化しても発泡体の圧縮特性に優れるこ
とは、ポリプロピレン系樹脂自体が発泡しないこと、さ
らに、ポリプロピレン系樹脂が剛性に優れていることよ
り、気泡の補強剤として作用しているものと推定される
。In addition, the reason why the foam has excellent compression properties even when the cells are made open is that the polypropylene resin itself does not foam, and because the polypropylene resin has excellent rigidity, it acts as a reinforcing agent for the cells. It is estimated that
見豆五羞果
このように、本発明によれば、従来の連続気泡を有する
発泡体に比して圧縮特性に非常に優れているため、吸音
性が要求される遮音床材等に極めて有用であるとともに
、圧縮硬さを必要とする吸水材、断熱材、濾過材、さら
には包装材等、その用途は極めて広いものである。As described above, the present invention has extremely superior compression properties compared to conventional foams with open cells, so it is extremely useful for sound-insulating flooring materials that require sound absorption properties. In addition, its uses are extremely wide, including water absorbing materials, heat insulating materials, filtration materials, and even packaging materials that require compressive hardness.
以下実施例により本発明をさら具体的に説明するが、そ
れに先立って実施例で採用した試験方法について述べる
。The present invention will be explained in more detail with reference to Examples below, but prior to that, the test methods employed in the Examples will be described.
(以下余白)
(1)見掛密度
JIS K−6767ポリエチレンフオーム試験方法に
準じ1次式で求めた。(Left below) (1) Apparent density: Determined using a linear equation according to JIS K-6767 polyethylene foam test method.
D=−W−
■
D:見掛密度(g/ al )
W:試験片の質量(g)
V:試験片の体積(an
(2)圧縮特性(圧縮硬さ)
JIS K−6767ポリエチレンフオーム試験方法に
準じ1次式で求めた。D=-W- ■ D: Apparent density (g/al) W: Mass of test piece (g) V: Volume of test piece (an) (2) Compression characteristics (compression hardness) JIS K-6767 polyethylene foam test It was calculated using a linear equation according to the method.
H=−l−
L
H:圧縮硬さ(kg/a#)
P:25%圧縮し、20秒後の荷重(kg)W:試験片
の幅(CI)
L:試験片の長さ(cm)
(以下余白)
(3)連続気泡率
ASTM−D−2856エアーピクノメーター法に準じ
次式で求めた。H=-l- L H: Compression hardness (kg/a#) P: 25% compression, load after 20 seconds (kg) W: Width of test piece (CI) L: Length of test piece (cm ) (Hereinafter, blank) (3) Open cell rate It was determined by the following formula according to the ASTM-D-2856 air pycnometer method.
■=−ヱ工−紅”−X100
S
V:連続気泡率(%)
vs:試験片の見掛の体積(cc)
ΔV:試験片の真の体積(cc)
実施例1
エチレン−酢酸ビニル共重合体として住人化学■製のエ
バテートH−2020(融点=91℃、密度: 0.9
3g/cd、メルトインデックス: 1.5g/10分
、酢酸ビニル含有量215重量%)を74.2重量部、
粉末状ポリプロピレン系樹脂として住友化学■製ノーブ
レンH1t−100(ホモポリマー)(粒径:500μ
腫、融点170℃、密度: 0.91g/aJ、メルト
インデックス: 7g/10分)を31.8重量部、発
泡剤として大塚化学■製のアゾシカ−ボンアミドAZ−
Lを5重量部、架橋剤として化薬ヌーソーmumの1,
3ビス(ターシャリブチルパーオキシイソプロピル)ベ
ンゼン[バー力ドックス14/40]を1重量部使用し
、これらをインターナルミキサーで溶融、混線後、二本
ロールでシート化し1発泡温度175℃にて一段加圧、
加熱発泡方式で発泡体を得た。得られた発泡体は後記の
第1表に示した如く、圧縮硬さ、連続気泡率いずれも優
れた発泡体であった。■=-Eko-Ken"-X100 SV: Open cell rate (%) vs: Apparent volume of test piece (cc) ΔV: True volume of test piece (cc) Example 1 Ethylene-vinyl acetate co- As a polymer, Evatate H-2020 (melting point = 91°C, density: 0.9, manufactured by Sumima Kagaku ■) was used.
3g/cd, melt index: 1.5g/10min, vinyl acetate content 215% by weight), 74.2 parts by weight,
Noblen H1t-100 (homopolymer) manufactured by Sumitomo Chemical ■ (particle size: 500μ) is used as a powdered polypropylene resin.
31.8 parts by weight of foam, melting point 170°C, density: 0.91 g/aJ, melt index: 7 g/10 min), and Azocicabonamide AZ- manufactured by Otsuka Chemical ■ as a blowing agent.
5 parts by weight of L, 1 part of Kayaku Nuso mum as a crosslinking agent,
1 part by weight of 3-bis(tert-butylperoxyisopropyl)benzene [Berriki Dox 14/40] was melted in an internal mixer, mixed, and then formed into a sheet with two rolls at a foaming temperature of 175°C. One stage pressurization,
A foam was obtained using a heating foaming method. The resulting foam was excellent in both compression hardness and open cell ratio, as shown in Table 1 below.
実施例2〜4
実施例1と同様のエチレン−酢酸ビニル共重合体と粉末
状ポリプロピレン系樹脂の配合率を第1表に示した如く
変化させ、実施例1と同様の方式で発泡体を得た。得ら
れた発泡体は、遮音床材に使用されている通常の独立気
泡発泡体の圧縮硬さより優れており、充分実用に耐える
ものであった。また、粉末状ポリプロピレン系樹脂の増
加に従い、連続気泡率は高く良好な連続気泡発泡体であ
った。Examples 2 to 4 Foams were obtained in the same manner as in Example 1 by changing the blending ratio of the same ethylene-vinyl acetate copolymer and powdered polypropylene resin as shown in Table 1. Ta. The obtained foam had a compression hardness superior to that of ordinary closed-cell foams used in sound-insulating flooring materials, and was sufficiently durable for practical use. Furthermore, as the amount of powdered polypropylene resin increased, the open cell rate was high and the open cell foam was good.
比較例1
第1表に示した如く、実施例1で使用したエチレン−酢
酸ビニル共重合体106重量部を用い、実施例1と同様
の方式で発泡体を得た。得られた発泡体は第1表に示し
た如く、連続気泡率は著しく低く、はとんど独立気泡の
発泡体であった。Comparative Example 1 As shown in Table 1, a foam was obtained in the same manner as in Example 1 using 106 parts by weight of the ethylene-vinyl acetate copolymer used in Example 1. As shown in Table 1, the resulting foam had a significantly low open cell ratio and was mostly a closed cell foam.
比較例2〜J
実施例1で使用したエチレン−酢酸ビニル共重合体およ
び粉末状ポリプロピレン系樹脂を用い第1表に示した配
合組成にて、実施例1同様の方式で発泡体を得た。得ら
れた発泡体は、粉末状ポリプロピレン系樹脂が74.2
重量部の場合、連続気泡率は高いが、圧縮硬さが著しく
低下し、床下地材等として使用できない、一方、粉末状
ポリプロピレン系樹脂が5.3重量部の場合は圧縮硬さ
には優れているが、連続気泡率が著しく低く、吸音性が
著しく劣るため、前記と同様に床下地材としての使用に
は適さない。Comparative Examples 2 to J A foam was obtained in the same manner as in Example 1 using the ethylene-vinyl acetate copolymer and powdered polypropylene resin used in Example 1 and having the composition shown in Table 1. The obtained foam has a powdery polypropylene resin of 74.2
If the amount of powdered polypropylene resin is 5.3 parts by weight, the open cell rate is high, but the compression hardness is significantly reduced and it cannot be used as a floor sub-material, etc. On the other hand, if the powdered polypropylene resin is 5.3 parts by weight, the compression hardness is excellent. However, since the open cell ratio is extremely low and the sound absorption properties are extremely poor, it is not suitable for use as a floor subfloor material, as mentioned above.
実施例5〜6
低密度ポリエチレンとして住人化学■製のF−216−
1(融点:115℃、密度: 0.92g/aI、メル
トインデックス1.2g/10分)を使用し、第1表に
示した組成にて実施例1と同様の方式で発泡体を得た。Examples 5 to 6 F-216 manufactured by Juumin Chemical Co., Ltd. as a low-density polyethylene
1 (melting point: 115°C, density: 0.92 g/aI, melt index 1.2 g/10 min), a foam was obtained in the same manner as in Example 1 with the composition shown in Table 1. .
得られた発泡体は遮音性を満足するための60%以上の
連続気泡率を確保するとともに、非常に優れた圧縮硬さ
を有する発泡体であった。The obtained foam ensured an open cell ratio of 60% or more to satisfy sound insulation properties, and had extremely excellent compression hardness.
実施例7
無機粉末として三共製粉■製の重質炭酸カルシウム[ニ
スカロン#800] (平均粒子径1.6μm)を使用
し、第1表に示した組成にて実施例1と同様の方式で発
泡体を得た。得られた発泡体は実施例1と同様良好な発
泡体であった。Example 7 Heavy calcium carbonate [Niscallon #800] manufactured by Sankyo Seifun ■ (average particle size 1.6 μm) was used as the inorganic powder, and foamed in the same manner as in Example 1 with the composition shown in Table 1. I got a body. The obtained foam was a good foam as in Example 1.
実施例8
実施例1で使用した粉末状ポリプロピレン系樹脂を粉砕
機で300μ閣に粉砕し、第1表に示した配合組成にて
実施例1と同様の方式で発泡体を得た。得られた発泡体
は実施例1と同良好な発泡体であった。Example 8 The powdered polypropylene resin used in Example 1 was ground to a size of 300 μm using a grinder, and a foam was obtained in the same manner as in Example 1 using the blending composition shown in Table 1. The obtained foam had the same good quality as Example 1.
実施例9
ペレット状ポリプロピレン系樹脂(プロピレン−エチレ
ンコポリマー)として出光石油化学■製J−650H(
ブロック共重合体)(融点:168℃、密度: 0.9
0g/d、メルトインデックス:5g/10分)を粉砕
機で600μ腸に粉砕し、第1表に示した組成にて実施
例1と同様の方式で発泡体を得た。得られた発泡体は実
施例1と比して圧縮硬さが若干低下するが、実用的には
全く問題なく、高い連続気泡率を有する発泡体が得られ
た。Example 9 J-650H (manufactured by Idemitsu Petrochemical Co., Ltd.) was used as a pelleted polypropylene resin (propylene-ethylene copolymer).
block copolymer) (melting point: 168°C, density: 0.9
0 g/d, melt index: 5 g/10 min) was ground into 600 microns using a grinder, and a foam was obtained in the same manner as in Example 1 with the composition shown in Table 1. Although the compression hardness of the obtained foam was slightly lower than that of Example 1, there was no practical problem at all, and a foam with a high open cell ratio was obtained.
以上の結果を、第1表にまとめた。The above results are summarized in Table 1.
(以下余白)(Margin below)
Claims (1)
が架橋性ポリエチレン系樹脂よりも20℃以上高く、か
つ190℃以下であるポリプロピレン系樹脂を、 (a)/[(a)+(b)]=40〜90重量%(b)
/[(a)+(b)]=10〜60重量%の範囲で含み
、かつ、前記架橋性ポリエチレン系樹脂を架橋せしめる
とともに、連続気泡率が60〜90%であることを特徴
とするポリエチレン系樹脂発泡体。 2、溶融した(a)架橋性ポリエチレン系樹脂と、熱分
解型発泡剤および有機過酸化物、さらには(b)融点が
架橋性ポリエチレン系樹脂よりも20℃以上高く、かつ
190℃以下である粉末状ポリプロピレン系樹脂とを (a)/[(a)+(b)]=40〜90重量%(b)
/[(a)+(b)]=10〜60重量%の範囲で混合
し、(b)粉末状ポリプロピレン系樹脂を非溶融状態に
て均一に分散せしめ、次いで、加熱して(a)架橋性ポ
リエチレン系樹脂を架橋させ、発泡させるとともに、(
b)粉末状ポリプロピレン系樹脂を溶融せしめることを
特徴とするポリエチレン系樹脂発泡体の製造法。[Scope of Claims] 1. (a) a crosslinkable polyethylene resin and (b) a polypropylene resin whose melting point is 20°C or more higher than the crosslinkable polyethylene resin and 190°C or lower, (a)/[ (a) + (b)] = 40-90% by weight (b)
/[(a)+(b)]=10 to 60% by weight, and the polyethylene is crosslinked with the crosslinkable polyethylene resin, and has an open cell ratio of 60 to 90%. system resin foam. 2. Melted (a) crosslinkable polyethylene resin, a thermally decomposable blowing agent and an organic peroxide, and (b) a melting point that is 20°C or more higher than the crosslinkable polyethylene resin and 190°C or less Powdered polypropylene resin (a)/[(a)+(b)]=40 to 90% by weight (b)
/[(a)+(b)]=10 to 60% by weight, (b) powdered polypropylene resin is uniformly dispersed in an unmolten state, and then heated to (a) crosslink In addition to crosslinking and foaming polyethylene resin,
b) A method for producing a polyethylene resin foam, which comprises melting a powdered polypropylene resin.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1012769A JP2673310B2 (en) | 1989-01-20 | 1989-01-20 | Method for producing polyethylene resin foam having open cells |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1012769A JP2673310B2 (en) | 1989-01-20 | 1989-01-20 | Method for producing polyethylene resin foam having open cells |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02194037A true JPH02194037A (en) | 1990-07-31 |
JP2673310B2 JP2673310B2 (en) | 1997-11-05 |
Family
ID=11814611
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1012769A Expired - Lifetime JP2673310B2 (en) | 1989-01-20 | 1989-01-20 | Method for producing polyethylene resin foam having open cells |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2673310B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1752485A1 (en) | 2005-08-08 | 2007-02-14 | Alveo AG | Soft polyolefin foams with high heat resistance |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2174771A4 (en) | 2007-06-27 | 2013-06-05 | Asahi Fibreglass Co | Foam board of polyolefin resin, and method for production thereof |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6264530A (en) * | 1985-09-17 | 1987-03-23 | Serutekuno:Kk | Manufacture of open-cell foam of polyethylene or ethylene copolymer |
-
1989
- 1989-01-20 JP JP1012769A patent/JP2673310B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6264530A (en) * | 1985-09-17 | 1987-03-23 | Serutekuno:Kk | Manufacture of open-cell foam of polyethylene or ethylene copolymer |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1752485A1 (en) | 2005-08-08 | 2007-02-14 | Alveo AG | Soft polyolefin foams with high heat resistance |
Also Published As
Publication number | Publication date |
---|---|
JP2673310B2 (en) | 1997-11-05 |
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