JPH06157801A - Highly foamed polyethylene - Google Patents
Highly foamed polyethyleneInfo
- Publication number
- JPH06157801A JPH06157801A JP31970992A JP31970992A JPH06157801A JP H06157801 A JPH06157801 A JP H06157801A JP 31970992 A JP31970992 A JP 31970992A JP 31970992 A JP31970992 A JP 31970992A JP H06157801 A JPH06157801 A JP H06157801A
- Authority
- JP
- Japan
- Prior art keywords
- polyethylene
- fluorocarbon
- foaming
- foam
- layer
- 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]
【産業上の利用分野】本発明は多泡性ポリエチレンに関
するものである。FIELD OF THE INVENTION The present invention relates to a foamed polyethylene.
【０００２】本発明は、従来熱可塑性樹脂の押出成形に
使用せられる押出機に加圧が可能なアキュムレータと、
樹脂と発泡剤を高圧で混合できる混合部分を設けたＳＦ
プロセス成形機として公知の押出機を用い、ポリエチレ
ンと沸点が−１０〜−４０℃フルオロカーボンＣＦ3Ｃ
ＦＨＣＦ3，ＣＦ3ＣＦ2ＣＦ2Ｈ，ＣＦ3ＣＦ2ＣＨ3，Ｃ
Ｆ2ＨＣＦ2Ｈ,ＣＦ2ＨＣＨ3,ＣＦ3ＣＦＨ2,ＣＦ3ＣＦ2
ＣＦ3,ＣＨ3ＣＦ2ＣＨ3、または沸点が１５〜４５℃の
フルオロカーボンＣＦ3ＣＦＨＣＦＨＣＦ3，ＣＦ2ＨＣ
Ｆ2ＣＦＨ2,ＣＦ3ＣＨ2ＣＦ2Ｈ,ＣＦ3ＣＦ2ＣＦ2Ｃ
Ｈ3，(ＣＦ3)3ＣＨ,ＣＦ3ＣＦＨＣＦ2Ｈ,ＣＦ2ＨＣＦＨ
2,ＣＦ2ＨＣＦ2ＣＦ2Ｈ,ＣＦ3ＣＦ2ＣＦＨ2,ＣＦ2ＨＣ
Ｆ2ＣＨ3,ＣＨ3ＣＦ2ＣＨ3,ＣＦ3ＣＨ2ＣＦ3，ＣＦ3Ｃ
Ｆ2ＣＦ2ＣＦ3を発泡剤とし、加圧下でポリエチレンの
溶融温度以上の温度で混合し、これよりも低圧で低温の
型に射出成形することにより発泡性が良好な多泡性ポリ
エチレンを成形することができる。この多泡性ポリエチ
レンは樹脂成分としてポリエチレンのみ、発泡成分とし
てフルオロカーボンのみを含むため、廃棄後分別の必要
がなく、また熱可塑性のポリエチレンであるがゆえにリ
サイクル処理が非常に容易であるという特徴を持つ。The present invention relates to an accumulator capable of pressurizing an extruder conventionally used for extrusion molding of thermoplastic resins,
SF with a mixing part where resin and foaming agent can be mixed under high pressure
A known extruder is used as a process molding machine, and the boiling point of polyethylene is -10 to -40 ° C fluorocarbon CF 3 C.
FHCF 3 , CF 3 CF 2 CF 2 H, CF 3 CF 2 CH 3 , C
F 2 HCF 2 H, CF 2 HCH 3 , CF 3 CFH 2 , CF 3 CF 2
CF 3 , CH 3 CF 2 CH 3 , or fluorocarbon CF 3 CFHCFHCF 3 , CF 2 HC having a boiling point of 15 to 45 ° C.
F 2 CFH 2 , CF 3 CH 2 CF 2 H, CF 3 CF 2 CF 2 C
H 3 , (CF 3 ) 3 CH, CF 3 CFHCF 2 H, CF 2 HCFH
2 , CF 2 HCF 2 CF 2 H, CF 3 CF 2 CFH 2 , CF 2 HC
F 2 CH 3 , CH 3 CF 2 CH 3 , CF 3 CH 2 CF 3 , CF 3 C
Using F 2 CF 2 CF 3 as a foaming agent, mix at a temperature above the melting temperature of polyethylene under pressure, and injection-mold into a mold at a lower pressure than this to form a multi-foam polyethylene with good foamability. can do. Since this multi-foam polyethylene contains only polyethylene as a resin component and only fluorocarbon as a foaming component, there is no need for separation after disposal, and because it is a thermoplastic polyethylene, it has the characteristics that it is extremely easy to recycle. .
【０００３】また、フルオロカーボンは、分子中に塩素
を含まないためオゾン層に対する影響が非常に小さいこ
とが特徴である。Fluorocarbons are also characterized in that they have very little effect on the ozone layer because they do not contain chlorine in the molecule.
【０００４】[0004]
【従来の技術】従来、多泡性プラスチックとしてはポリ
ウレタン等の熱硬化性樹脂が広く用いられている。ポリ
ウレタンを用いた発泡材料は成形加工が容易でしかも発
泡性が非常に良好で、家庭用冷蔵庫をはじめ断熱性を必
要とされる冷凍冷蔵装置の筐体、また、耐衝撃性または
遮音性が必要とされる建材等様々な製品分野で用いられ
ている。2. Description of the Related Art Conventionally, a thermosetting resin such as polyurethane has been widely used as a foamed plastic. Foamed material using polyurethane is easy to mold and has excellent foaming property, and it is necessary to have a housing for refrigerating equipment such as household refrigerators that require heat insulation and shock resistance or sound insulation. It is used in various product fields such as construction materials.
【０００５】近年、環境問題の重要性が叫ばれ、廃棄物
の処理やフロン等の問題が指摘されている。この様な状
況の中、ポリウレタンを用いた断熱材では冷蔵庫等の筐
体の廃棄やリサイクル、そして断熱層に含まれるフロン
など多くの問題点を抱えている。In recent years, the importance of environmental problems has been emphasized, and problems such as waste treatment and chlorofluorocarbon have been pointed out. Under such circumstances, the heat insulating material using polyurethane has many problems such as disposal and recycling of the case of a refrigerator and the like, and CFC contained in the heat insulating layer.
【０００６】ポリウレタンは三次元的に架橋した熱硬化
性樹脂であるため、再生利用が難しく、コストに見合う
だけのリサイクル性は得られない。また、冷蔵庫等に成
形されたものは、ポリウレタン層が外張りと内張りの接
着層となり冷蔵庫の筐体自体の強度を維持するため重要
な役割を果たしている。このため、冷蔵庫筐体を分解し
断熱層を取り出すのに非常な労力を要する。Since polyurethane is a three-dimensionally cross-linked thermosetting resin, it is difficult to recycle it, and the recyclability commensurate with the cost cannot be obtained. In the case of a molded article such as a refrigerator, the polyurethane layer serves as an adhesive layer between the outer layer and the inner layer, and plays an important role in maintaining the strength of the refrigerator casing itself. Therefore, it takes a great deal of effort to disassemble the refrigerator casing and take out the heat insulating layer.
【０００７】一方、多泡性ポリエチレンは窒素，フロン
ＣＦＣ１１，ＣＦＣ１２を用いて発泡させたものや、ペ
ンタン，ブタン，プロパンなどの低沸点炭化水素系の揮
発性発泡剤を用いたもの、また石油エーテル，塩化ビニ
ルモノマ等の溶剤系の揮発性発泡剤を用いたもの、重炭
酸ナトリウム，炭酸アンモン等の無機系の化学発泡剤を
用いたもの、またヒドラジン系，ニトロン系，アゾ系の
化学発泡剤を用いたものや上記の発泡剤を何種類か併用
するものについては特公昭42−2277号公報のように公知
である。しかし、ＣＦＣ１１，ＣＦＣ１２等フロンは成
形性，発泡性が良好であるが、これを用いたものは大気
中に放出された場合、オゾン層破壊の危険性がある。ま
た、無機系および有機系の化学発泡剤は発泡性が良好で
あるが、発泡後ポリエチレン中に残留するため、多泡性
ポリエチレンのリサイクル使用には、問題があった。On the other hand, the multi-foam polyethylene is foamed using nitrogen, Freon CFC11, CFC12, a low-boiling hydrocarbon volatile foaming agent such as pentane, butane, propane, or petroleum ether. , Those using solvent-based volatile blowing agents such as vinyl chloride monomer, those using inorganic chemical blowing agents such as sodium bicarbonate and ammonium carbonate, and hydrazine-based, nitrone-based and azo-based chemical blowing agents. Those used and those in which several kinds of the above-mentioned foaming agents are used in combination are known as in JP-B-42-2277. However, CFCs such as CFC11 and CFC12 have good moldability and foamability, but those using them have a risk of depleting the ozone layer when released into the atmosphere. Further, although the inorganic and organic chemical foaming agents have good foaming properties, they remain in the polyethylene after foaming, so that there is a problem in recycling the multifoaming polyethylene.
【０００８】発明は上記のような断熱性，耐衝撃性，遮
音性が必要とされる構造材料に利用される多泡性プラス
チックに係る問題点を解決するために発明されたもので
ある。The invention was invented in order to solve the above-mentioned problems relating to the multi-foamed plastic used as a structural material which requires heat insulation, impact resistance and sound insulation.
【０００９】[0009]
【発明が解決しようとする課題】環境問題を考えたと
き、ポリウレタンを用いた発泡材料の問題点として、ポ
リウレタン自体の難リサイクル性による廃棄問題、発泡
体中に含まれるフロンによるオゾン層破壊の問題が挙げ
られる。In consideration of environmental problems, foaming materials using polyurethane include problems such as disposal due to the difficulty of recycling polyurethane itself, and ozone layer depletion due to CFCs contained in the foam. Is mentioned.
【００１０】本発明の目的はこの様な問題を解決するた
め、熱可塑性樹脂であるがゆえに廃棄後のリサイクル処
理が容易なポリエチレンとオゾン層を破壊することのな
い特定のフルオロカーボンを用い、リサイクル使用が容
易な発泡材料を提供することにある。In order to solve such a problem, the object of the present invention is to use polyethylene, which is a thermoplastic resin, which is easy to be recycled after disposal, and a specific fluorocarbon, which does not destroy the ozone layer, for recycling. To provide a foam material that is easy to manufacture.
【００１１】[0011]
【課題を解決するための手段】発泡材料の基材として熱
可塑性樹脂のポリエチレンを用い、溶融，成形によるリ
サイクルを容易にした。発泡剤としてオゾン層を破壊す
ることのない特定のフルオロカーボンを用いる。すなわ
ち、本発明は、従来熱可塑性樹脂の押出成形に使用せら
れる押出機に加圧が可能なアキュムレータと、樹脂と発
泡剤を高圧で混合できる混合部分を設けたＳＦプロセス
成形機として公知の押出機を用い、ポリエチレンと沸点
が−１０〜−４０℃フルオロカーボンＣＦ3ＣＦＨＣ
Ｆ3， ＣＦ3ＣＦ2ＣＦ2Ｈ，ＣＦ3ＣＦ2ＣＨ3，ＣＦ2
ＨＣＦ2Ｈ，ＣＦ2ＨＣＨ3，ＣＦ3ＣＦＨ2，ＣＦ3ＣＦ2
ＣＦ3，ＣＨ3ＣＦ2ＣＨ3、または沸点が１５〜４５℃の
フルオロカーボンＣＦ3ＣＦＨＣＦＨＣＦ3，ＣＦ2ＨＣ
Ｆ2ＣＦＨ2，ＣＦ3ＣＨ2ＣＦ2Ｈ，ＣＦ3ＣＦ2ＣＦ2ＣＨ
3，(ＣＦ3)3ＣＨ,ＣＦ3ＣＦＨＣＦ2Ｈ,ＣＦ2ＨＣＦＨ2,
ＣＦ2ＨＣＦ2ＣＦ2Ｈ,ＣＦ3ＣＦ2ＣＦＨ2,ＣＦ2ＨＣＦ2
ＣＨ3,ＣＨ3ＣＦ2ＣＨ3,ＣＦ3ＣＨ2ＣＦ3，ＣＦ3ＣＦ2
ＣＦ2ＣＦ3 を発泡剤とし、加圧下でポリエチレンの溶
融温度以上の温度で混合し、これよりも低圧で低温の型
に射出成形することにより発泡性が良好な多泡性ポリエ
チレンを成形することができる。この多泡性ポリエチレ
ンは樹脂成分としてポリエチレンのみ、発泡成分として
フルオロカーボンのみを含むため、廃棄後分別の必要が
なく、また熱可塑性のポリエチレンであるがゆえにリサ
イクル処理が非常に容易であるという特徴を持つ。[MEANS FOR SOLVING THE PROBLEMS] Polyethylene, which is a thermoplastic resin, is used as a base material of a foam material to facilitate recycling by melting and molding. A specific fluorocarbon that does not destroy the ozone layer is used as a foaming agent. That is, the present invention is known as an SF process molding machine known as an SF process molding machine provided with an accumulator capable of pressurizing an extruder conventionally used for extrusion molding of a thermoplastic resin and a mixing portion capable of mixing a resin and a foaming agent at high pressure. With a polyethylene, boiling point is -10 to -40 ℃ Fluorocarbon CF 3 CFHC
F 3 , CF 3 CF 2 CF 2 H, CF 3 CF 2 CH 3 , CF 2
HCF 2 H, CF 2 HCH 3 , CF 3 CFH 2 , CF 3 CF 2
CF 3 , CH 3 CF 2 CH 3 , or fluorocarbon CF 3 CFHCFHCF 3 , CF 2 HC having a boiling point of 15 to 45 ° C.
F 2 CFH 2 , CF 3 CH 2 CF 2 H, CF 3 CF 2 CF 2 CH
3 , (CF 3 ) 3 CH, CF 3 CFHCF 2 H, CF 2 HCFH 2 ,
CF 2 HCF 2 CF 2 H, CF 3 CF 2 CFH 2 , CF 2 HCF 2
CH 3 , CH 3 CF 2 CH 3 , CF 3 CH 2 CF 3 , CF 3 CF 2
Molding multi-foam polyethylene having good foamability by using CF 2 CF 3 as a foaming agent, mixing under pressure at a temperature above the melting temperature of polyethylene, and injection molding into a mold at a lower pressure and a lower temperature. You can Since this multi-foam polyethylene contains only polyethylene as a resin component and only fluorocarbon as a foaming component, there is no need for separation after disposal, and because it is a thermoplastic polyethylene, it has the characteristics that it is extremely easy to recycle. .
【００１２】また、フルオロカーボンは、分子中に塩素
を含まないためオゾン層に対する影響が非常に小さいこ
とが特徴である。Further, fluorocarbons are characterized in that they do not contain chlorine in the molecule and therefore have a very small effect on the ozone layer.
【００１３】[0013]
【作用】ポリウレタン，ポリエチレンの発泡剤には、従
来、ＣＦＣ１１やＣＦＣ１２等オゾン層を破壊する物質
が用いられている。特に、ＣＦＣ１２はポリエチレンの
融点以上の温度で加圧下溶融混合しＳＦプロセス成形機
等を用い成形発泡させる方法を用いるが、これと同様な
方法により容易にポリエチレンの発泡体を得られるもの
には次のようなものが挙げられる。まず、低沸点のフル
オロカーボンを表１に示した。As a foaming agent for polyurethane and polyethylene, conventionally, a substance such as CFC11 or CFC12 that destroys the ozone layer has been used. In particular, CFC12 uses a method in which it is melt-mixed under pressure at a temperature equal to or higher than the melting point of polyethylene and molded and foamed by using an SF process molding machine or the like. Something like. First, Table 1 shows low-boiling fluorocarbons.
【００１４】[0014]
【表１】 [Table 1]
【００１５】また、沸点が常温（２５℃）に近いものに
は、表２に示すものが挙げられる。Further, those having a boiling point close to room temperature (25 ° C.) include those shown in Table 2.
【００１６】[0016]
【表２】 [Table 2]
【００１７】これらフルオロカーボンの沸点は、成形後
のポリエチレン発泡体の気泡の大きさや、密度に影響す
るため、密度や気泡の大きさによって、単独で、または
何種かの混合物をポリエチレンと混合することができ
る。このフルオロカーボンは塩素を含まないため、オゾ
ン層に対する影響が小さい。また従来は発泡助剤として
アゾジカルボンアミド等有機発泡剤を用いることが多い
が、これらはポリエチレンに対しては不純物となり、リ
サイクル性を低下させる大きな原因となっていた。本発
明では、樹脂成分としてポリエチレンのみを用いている
ため、不純物が少なくリサイクル性が良好となる。Since the boiling points of these fluorocarbons affect the size and density of the cells of the polyethylene foam after molding, depending on the density and the size of the cells, it is advisable to mix them alone or in a mixture of several kinds with polyethylene. You can Since this fluorocarbon does not contain chlorine, it has a small effect on the ozone layer. Conventionally, an organic foaming agent such as azodicarbonamide is often used as a foaming auxiliary agent, but these are impurities to polyethylene, which is a major cause of lowering recyclability. In the present invention, since only polyethylene is used as the resin component, the amount of impurities is small and the recyclability is good.
【００１８】[0018]
〈実施例１〉ポリエチレンを押出機中で軟化点温度以上
の温度（１００℃−２００℃）で溶融し、加圧下ＣＦ3
ＣＦ2ＣＨ3 と良く混合した。その後、押出機より常温
常圧の金型へ押し出した。ダイス径および、混練時間の
調整により、密度０.３〜０.７ｇ／cm3 で均一で微細な
気泡を持った多泡性ポリエチレンが得られた。<Example 1> Polyethylene is melted in an extruder at a temperature (100 ° C to 200 ° C) higher than the softening point and CF 3 is applied under pressure.
Mix well with CF 2 CH 3 . Then, it was extruded from an extruder into a mold at normal temperature and pressure. By adjusting the die diameter and the kneading time, a multi-foam polyethylene having a density of 0.3 to 0.7 g / cm 3 and uniform and fine bubbles was obtained.
【００１９】〈実施例２〉実施例１に示した多泡性ポリ
エチレンを粉砕後、押出機中で１００℃−２００℃の温
度で溶融し、加圧下ＣＦ3ＣＦ2ＣＨ3 と良く混合した。
その後、押出機より常温常圧の金型へ押し出した。ダイ
ス径および、混練時間の調整により、密度０.３〜０.７
ｇ／cm3 、均一で微細な気泡を持った多泡性ポリエチレ
ンが得られた。この再生多泡性ポリエチレンの中で、再
生前のものと同じ条件で成形されたものは、密度，強
度，外観がリサイクル処理前のものとほぼ同じで、リサ
イクル処理が容易に可能であることが示された。Example 2 The foamed polyethylene shown in Example 1 was crushed, melted in an extruder at a temperature of 100 ° C. to 200 ° C., and mixed well with CF 3 CF 2 CH 3 under pressure.
Then, it was extruded from an extruder into a mold at normal temperature and pressure. By adjusting the die diameter and kneading time, the density is 0.3 to 0.7.
Polycellular polyethylene having g / cm 3 and uniform and fine bubbles was obtained. Among the recycled multi-foam polyethylene, the one molded under the same conditions as the one before recycling has almost the same density, strength, and appearance as those before the recycling process, and thus it can be easily recycled. Was shown.
【００２０】〈実施例３〉押出機中でポリエチレンを軟
化点温度以上の温度（１００℃−２００℃）で溶融し、
加圧下ＣＦ3ＣＦ2ＣＦ2Ｈ と良く混合した。その後、複
数の押出し口から常温常圧の家庭用冷凍冷蔵庫の筐体部
分に射出成形した。この筐体部分の断熱層の厚さは３０
mmでこの中に形成された多泡性ポリエチレン層は、数mm
のスキン層と均一で微細な気泡を持ったコア層から成っ
ており、未充填部分や大きなウエルドができないことを
確認した。Example 3 Polyethylene was melted in an extruder at a temperature above the softening point (100 ° C.-200 ° C.),
Mix well with CF 3 CF 2 CF 2 H under pressure. After that, injection molding was performed from a plurality of extrusion ports into a housing part of a home-use freezer-refrigerator at normal temperature and pressure. The thickness of the heat insulation layer of this housing is 30
The foamed polyethylene layer formed in this in mm is a few mm
It was confirmed that it consisted of the skin layer and the core layer having uniform and fine bubbles, and that no unfilled part or large weld could be formed.
【００２１】次に家庭用冷凍冷蔵庫の筐体の強度及び断
熱性を調べた結果、ウレタンフォームを用いた家庭用冷
凍冷蔵庫と比較し同等であった。Next, as a result of examining the strength and heat insulation of the housing of the home refrigerator-freezer, it was found to be the same as that of the household refrigerator-freezer using urethane foam.
【００２２】[0022]
【発明の効果】本発明によれば、多泡性ポリエチレンを
断熱材として家庭用冷凍冷蔵庫の筐体部分に用いたた
め、成形性が良好で、かつ強度及び断熱性もウレタンフ
ォームを用いた家庭用冷凍冷蔵庫と比較して同等であっ
た。EFFECTS OF THE INVENTION According to the present invention, since the foamed polyethylene is used as the heat insulating material in the housing part of the home refrigerator / freezer, the moldability is good, and the strength and heat insulating property are made of urethane foam for household use. It was equivalent to a refrigerator-freezer.
Claims (1)
泡させたことを特徴とする多泡性ポリエチレン。1. A multifoam polyethylene characterized in that polyethylene is foamed with fluorocarbon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31970992A JPH06157801A (en) | 1992-11-30 | 1992-11-30 | Highly foamed polyethylene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31970992A JPH06157801A (en) | 1992-11-30 | 1992-11-30 | Highly foamed polyethylene |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06157801A true JPH06157801A (en) | 1994-06-07 |
Family
ID=18113308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31970992A Pending JPH06157801A (en) | 1992-11-30 | 1992-11-30 | Highly foamed polyethylene |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06157801A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6121337A (en) * | 1990-03-23 | 2000-09-19 | E. I. Du Pont De Nemours And Company | Compositions containing 1,1,2,2-tetrafluoroethane (HFC-134) for closed-cell polymer foam production |
-
1992
- 1992-11-30 JP JP31970992A patent/JPH06157801A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6121337A (en) * | 1990-03-23 | 2000-09-19 | E. I. Du Pont De Nemours And Company | Compositions containing 1,1,2,2-tetrafluoroethane (HFC-134) for closed-cell polymer foam production |
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