JP2003261707A - Method for producing resin foam - Google Patents
Method for producing resin foamInfo
- Publication number
- JP2003261707A JP2003261707A JP2002062187A JP2002062187A JP2003261707A JP 2003261707 A JP2003261707 A JP 2003261707A JP 2002062187 A JP2002062187 A JP 2002062187A JP 2002062187 A JP2002062187 A JP 2002062187A JP 2003261707 A JP2003261707 A JP 2003261707A
- Authority
- JP
- Japan
- Prior art keywords
- resin foam
- pressure
- inert fluid
- molding machine
- pressure container
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3461—Making or treating expandable particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3442—Mixing, kneading or conveying the foamable material
- B29C44/3446—Feeding the blowing agent
- B29C44/3453—Feeding the blowing agent to solid plastic material
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、超臨界流体を用
いて樹脂発泡体を製造する方法に関し、特にその製造装
置の簡略化が図れるようにしたものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a resin foam using a supercritical fluid, and in particular, to simplify the production apparatus thereof.
【０００２】[0002]
【従来の技術】二酸化炭素（ＣＯ2）、窒素（Ｎ2）など
の不活性流体からなる超臨界流体を発泡剤として使用し
て、発泡ポリスチレン、発泡ポリエチレンなどの樹脂発
泡体を製造することは周知であり、例えば米国特許第４
４７３６６５号公報、米国特許第５１５８９８６号公
報、特開平８−１１１９０号公報、特開平８−８５１２
９号公報、特開平１０−１７５２４８号公報などに開示
がなされている。2. Description of the Related Art It is not possible to manufacture resin foams such as expanded polystyrene and expanded polyethylene by using a supercritical fluid composed of an inert fluid such as carbon dioxide (CO 2 ) and nitrogen (N 2 ) as a foaming agent. Well known, for example US Pat.
473665, U.S. Pat. No. 5,158,986, JP-A-8-11190, and JP-A-8-8512.
No. 9 and Japanese Patent Application Laid-Open No. 10-175248.
【０００３】しかしながら、これらの先行発明にあって
は、いずれも大型で特殊な製造装置を必要とし、莫大な
設備コストを要し、作業効率も悪いという不都合があ
る。例えば、特開平１０−１７５２４８号公報に記載の
製法は、第１押出機と第２押出機とを用い、第１押出機
のシリンダー内に高圧不活性流体供給装置から高圧の超
臨界状態の二酸化炭素を圧入し、シリンダー内の溶融樹
脂に超臨界状態の二酸化炭素を溶解せしめ、ついでこれ
を第２押出機に送り込んで混練りし、第２押出機からダ
イスに送り込んで、ここで減圧して溶融樹脂を発泡せし
め、発泡ポリスチレンなどの樹脂発泡体とするものであ
る。However, these prior inventions have the disadvantages that they require a large-scale and special manufacturing apparatus, enormous equipment costs, and poor work efficiency. For example, the manufacturing method described in Japanese Patent Laid-Open No. 10-175248 uses a first extruder and a second extruder, and a high pressure superfluid dioxide from a high pressure inert fluid supply device is fed into the cylinder of the first extruder. Carbon is pressed in to dissolve carbon dioxide in the supercritical state in the molten resin in the cylinder, and then this is sent to the second extruder for kneading and then sent from the second extruder to the die where it is depressurized. A molten resin is foamed to form a resin foam such as expanded polystyrene.
【０００４】このような製造方法では、第１押出機のシ
リンダー内に二酸化炭素を供給するため、この二酸化炭
素の注入圧力は、シリンダー内の樹脂圧力に二酸化炭素
を超臨界状態に保つための圧力を加えた高圧力、例えば
７〜２０ＭＰａとしなければならない。このため、第１
押出機のシリンダーの耐圧を高める必要があるととも
に、二酸化炭素を注入するための高圧不活性流体供給装
置の吐出圧力も高くする必要があり、製造設備が高価と
なる不都合がある。また、シリンダー内の溶融樹脂の圧
力が高くなるので、押出作業が安定して行えない欠点も
ある。In such a manufacturing method, since carbon dioxide is supplied into the cylinder of the first extruder, the injection pressure of this carbon dioxide is the pressure for maintaining the carbon dioxide in the supercritical state at the resin pressure in the cylinder. Must be set to a high pressure, for example, 7 to 20 MPa. Therefore, the first
Since it is necessary to increase the pressure resistance of the cylinder of the extruder and also to increase the discharge pressure of the high-pressure inert fluid supply device for injecting carbon dioxide, there is a disadvantage that the manufacturing equipment becomes expensive. Further, since the pressure of the molten resin in the cylinder becomes high, there is a drawback that the extrusion work cannot be performed stably.
【０００５】[0005]
【発明が解決しようとする課題】よって、本発明におけ
る課題は、二酸化炭素などの超臨界流体を発泡剤として
用いて樹脂発泡体を製造する際、簡略化された製造装置
によっても従来と同等の樹脂発泡体を製造できるように
することにある。SUMMARY OF THE INVENTION Therefore, the object of the present invention is to produce a resin foam using a supercritical fluid such as carbon dioxide as a foaming agent, even if a simplified manufacturing apparatus is used. It is to be able to manufacture a resin foam.
【０００６】[0006]
【課題を解決するための手段】かかる課題を解決するた
め、請求項１にかかる発明は、熱可塑性樹脂の粉粒体を
圧力容器に入れ、この圧力容器内に不活性流体を注入
し、この不活性流体を超臨界状態として粉粒体に含浸せ
しめ、ついでこの状態の粉粒体を圧力容器から取り出し
て、成形機に投入し成形、発泡せしめることを特徴とす
る樹脂発泡体の製法である。In order to solve the above-mentioned problems, the invention according to claim 1 puts a granular material of a thermoplastic resin into a pressure container, and injects an inert fluid into the pressure container. A method for producing a resin foam characterized by impregnating a powder or granular material with an inert fluid in a supercritical state, then taking out the powder or granular material in this state from a pressure container, charging it into a molding machine, and molding and foaming. .
【０００７】請求項２にかかる発明は、不活性流体が二
酸化炭素であることを特徴とする請求項１記載の樹脂発
泡体の製法である。請求項３にかかる発明は、成形機に
よる成形が押出機による電線の押出被覆であることを特
徴とする請求項１または２記載の樹脂発泡体の製法であ
る。The invention according to claim 2 is the method for producing a resin foam according to claim 1, wherein the inert fluid is carbon dioxide. The invention according to claim 3 is the method for producing a resin foam according to claim 1 or 2, wherein the molding by the molding machine is extrusion coating of the electric wire by the extruder.
【０００８】[0008]
【発明の実施の形態】以下、本発明を詳しく説明する。
本発明で使用される熱可塑性樹脂としては、特に限定さ
れず、ポリスチレン、スチレン・ブタジエン共重合体、
アクリロニトリル・スチレン共重合体、アクリロニトリ
ル・ブタジエン・スチレン共重合体などのスチレン系樹
脂、ポリエチレン、ポリプロピレン、エチレン・プロピ
レン共重合体、エチレン・酢酸ビニル共重合体、エチレ
ン・エチルアクリレート共重合体、ポリ塩化ビニル、ポ
リ塩化ビニリデン、ポリブテン、ポリカーボネイト、ポ
リアセタール、ポリフェニレンオキサイド、ポリビニル
アルコール、ポリメチルメタクリレート、ポリエチレン
テレフタレート、ポリブチレンテレフタレート、ポリア
ミド、ポリイミド、フッ素樹脂、ポリエーテルサルフォ
ン、ポリエーテルエーテルケトンなどの１種または２種
以上の混合物が用いられる。BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below.
The thermoplastic resin used in the present invention is not particularly limited, polystyrene, styrene-butadiene copolymer,
Acrylonitrile / styrene copolymers, acrylonitrile / butadiene / styrene copolymers and other styrene resins, polyethylene, polypropylene, ethylene / propylene copolymers, ethylene / vinyl acetate copolymers, ethylene / ethyl acrylate copolymers, polychlorination One of vinyl, polyvinylidene chloride, polybutene, polycarbonate, polyacetal, polyphenylene oxide, polyvinyl alcohol, polymethyl methacrylate, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyimide, fluororesin, polyether sulfone, polyether ether ketone, etc. or Mixtures of two or more are used.
【０００９】また、この熱可塑性樹脂には、ポリマー成
分だけではなく、各種配合剤、添加物が配合、添加され
たものも含まれる。このような配合剤、添加剤として
は、無機充填剤、無機難燃剤、有機難燃剤、老化防止
剤、紫外線吸収剤、帯電防止剤、可塑剤、滑剤、ポリマ
ー系補強剤、着色剤、防かび剤などが挙げられる。The thermoplastic resin includes not only a polymer component but also a mixture of various compounding agents and additives. Such compounding agents and additives include inorganic fillers, inorganic flame retardants, organic flame retardants, antiaging agents, ultraviolet absorbers, antistatic agents, plasticizers, lubricants, polymer-based reinforcing agents, colorants, and fungicides. Agents and the like.
【００１０】また、本発明における粉粒体とは、上記熱
可塑性樹脂の平均粒径が０．００１〜０．１ｍｍの範囲
にある粉末、粒、ペレット、タブレットなどの粒子を指
称し、その個々の粒子の形態はいかなるものであっても
よく、押出成形、射出成形などの成形原料となりうる形
状であれば特に限られない。The powder or granule in the present invention refers to particles such as powder, granules, pellets and tablets in which the thermoplastic resin has an average particle diameter in the range of 0.001 to 0.1 mm. The particles may be in any form and are not particularly limited as long as they can be used as a forming raw material for extrusion molding, injection molding and the like.
【００１１】さらに、本発明において発泡剤として用い
られる不活性流体には、上記熱可塑性樹脂と反応しない
二酸化炭素、窒素、アルゴン、ヘリウムなどが挙げられ
るが、超臨界状態となる温度、圧力が低く、取り扱いが
容易で、樹脂への浸透性に優れ、価格も安価な二酸化炭
素がもっとも好ましい。この不活性流体には、助剤とし
てエタノール、メタノールなどのアルコール類を溶解性
向上の目的のために、０．０５〜１０ｗｔ％程度添加し
てもよい。Further, the inert fluid used as the foaming agent in the present invention includes carbon dioxide, nitrogen, argon, helium, etc., which do not react with the above-mentioned thermoplastic resin, but the temperature and pressure of the supercritical state are low. Most preferred is carbon dioxide, which is easy to handle, has excellent permeability to resins, and is inexpensive. Alcohols such as ethanol and methanol may be added to the inert fluid as auxiliary agents in an amount of about 0.05 to 10 wt% for the purpose of improving solubility.
【００１２】次に、本発明の製法を具体的に説明する。
まず、図１に示すような圧力容器１を用意する。この圧
力容器１は、ステンレス鋼などの鋼材からなる耐圧性の
容器であり、その上部には粉粒体を出し入れするための
蓋２が開閉可能にかつ密閉可能に設けられている。Next, the manufacturing method of the present invention will be specifically described.
First, a pressure vessel 1 as shown in FIG. 1 is prepared. The pressure vessel 1 is a pressure-resistant vessel made of a steel material such as stainless steel, and a lid 2 for loading and unloading powder particles is provided on the upper portion of the pressure vessel 1 in an openable and closable manner.
【００１３】また、この圧力容器１には、その内部に不
活性流体を供給するための供給パイプ３の一端が接続さ
れ、この供給パイプの他端３は昇圧ポンプ４を介して不
活性流体の供給源であるガスボンベ５に接続されてい
る。また、供給パイプ３には、不活性流体の流量、圧力
を調整する制御弁６が設けられている。さらに、圧力容
器１内部の不活性流体を臨界温度以上に加熱するための
ヒーター（図示略）が圧力容器１に取り付けられてい
る。Further, one end of a supply pipe 3 for supplying an inert fluid to the inside of the pressure vessel 1 is connected, and the other end 3 of the supply pipe is connected to the pressure vessel 1 via a booster pump 4 to store the inert fluid. It is connected to a gas cylinder 5 which is a supply source. Further, the supply pipe 3 is provided with a control valve 6 for adjusting the flow rate and pressure of the inert fluid. Further, a heater (not shown) for heating the inert fluid inside the pressure vessel 1 to a temperature above the critical temperature is attached to the pressure vessel 1.
【００１４】次に、この圧力容器１に熱可塑性樹脂の粉
粒体を投入する。実際には、布袋やネット、金属製かご
などに粉粒体を詰めて、これを圧力容器１内に入れるな
どの方法が取り扱いの点で好ましい。こののち、圧力容
器１の蓋２を閉じて、圧力容器１を密閉してから供給パ
イプ３から二酸化炭素などの不活性流体を、ガスボンベ
５から昇圧ポンプ４で加圧して圧力容器１内に供給す
る。不活性流体の圧力、流量は、制御弁６で適宜調節さ
れる。Next, a powder or granular material of thermoplastic resin is put into the pressure vessel 1. In practice, a method of packing a powder bag in a cloth bag, a net, a metal basket, or the like and putting it in the pressure vessel 1 is preferable in terms of handling. After that, the lid 2 of the pressure container 1 is closed, the pressure container 1 is sealed, and then an inert fluid such as carbon dioxide is supplied from the gas cylinder 5 to the inside of the pressure container 1 by pressurizing with a booster pump 4. To do. The pressure and flow rate of the inert fluid are appropriately adjusted by the control valve 6.
【００１５】ここで供給される不活性流体は、供給され
る時点で超臨界状態であってもよいし、圧力容器１内に
供給された後に超臨界状態としてもよい。圧力容器１内
の超臨界状態の不活性流体の圧力、温度は、使用される
不活性流体によって異なるが、二酸化炭素の場合には、
圧力７．５３ＭＰａ以上、温度３１．４℃以上とされ
る。圧力容器１内の不活性流体を超臨界状態とし、ある
いは超臨界状態を維持するためには、その内部の圧力を
不活性粒体の供給圧力で制御し、温度をヒーターで制御
することで行われる。The inert fluid supplied here may be in a supercritical state at the time of being supplied, or may be in a supercritical state after being supplied into the pressure vessel 1. The pressure and temperature of the supercritical inert fluid in the pressure vessel 1 differ depending on the inert fluid used, but in the case of carbon dioxide,
The pressure is 7.53 MPa or more and the temperature is 31.4 ° C. or more. In order to bring the inert fluid in the pressure vessel 1 into the supercritical state or to maintain the supercritical state, the internal pressure is controlled by the supply pressure of the inert particles, and the temperature is controlled by the heater. Be seen.
【００１６】超臨界状態の不活性流体の粉粒体への含浸
時間は、５〜５００分程度とされ、ほぼ含浸量が飽和と
なるように調節される。一般に、超臨界状態の不活性流
体は、粘度が極めて低く、物質への浸透性が非常に高い
ので、圧力容器１内での撹拌は原則的に不要であるが、
適宜撹拌を行うようにしてもよい。The impregnation time of the supercritical inert fluid into the granular material is about 5 to 500 minutes, and is adjusted so that the impregnated amount is almost saturated. Generally, since an inert fluid in a supercritical state has an extremely low viscosity and an extremely high permeability to a substance, stirring in the pressure vessel 1 is basically unnecessary, but
You may make it agitate suitably.
【００１７】かくして、圧力容器１内の粉粒体には、超
臨界状態の不活性流体が浸透してゆき、その含浸量は、
粉粒体の重量の３〜１０ｗｔ％程度となる。Thus, the inert fluid in the supercritical state penetrates into the granular material in the pressure vessel 1, and the impregnated amount is
It becomes about 3 to 10 wt% of the weight of the powder or granular material.
【００１８】ついで、圧力容器１の蓋２を開いて内部の
圧力を開放し、内部の粉粒体を取り出す。この圧力の開
放により粉粒体に含浸されている超臨界状態の不活性流
体が気体に変化して粉粒体から放散されてゆくが、その
すべてが放散するのではなく、圧力解放後、常温で１０
０分以内であれば、含浸されている不活性流体の約３ｗ
ｔ％程度が粉粒体内部に残っている。Then, the lid 2 of the pressure vessel 1 is opened to release the internal pressure, and the internal granular material is taken out. When the pressure is released, the supercritical inert fluid impregnated in the powder and granules is transformed into a gas and is diffused from the powder and granules, but not all of it is diffused. In 10
Within 0 minutes, about 3w of impregnated inert fluid
About t% remains inside the granular material.
【００１９】次に、この粉粒体を速やかに押出機、射出
成型機などの成形機のホッパーに投入し、その粉粒体を
なす熱可塑性樹脂の種類に応じた成形条件で押出成形、
射出成形などを行う。この成形の際には、成形機のシリ
ンダー内の圧力、温度は、通常不活性流体の超臨界状態
の圧力および温度以上となっているので、シリンダー内
で溶融樹脂から不活性流体が抜け出ることはない。Next, this powder or granular material is rapidly charged into a hopper of a molding machine such as an extruder or an injection molding machine, and extrusion molding is carried out under molding conditions according to the kind of the thermoplastic resin forming the powder or granular material.
Injection molding is performed. At the time of this molding, the pressure and temperature in the cylinder of the molding machine are usually higher than the pressure and temperature in the supercritical state of the inert fluid, so the inert fluid cannot escape from the molten resin in the cylinder. Absent.
【００２０】そして、押出機の押出ダイあるいは射出成
型機の射出金型において、溶融樹脂の圧力が開放される
ことで、溶融樹脂に含浸されている超臨界状態の不活性
流体が気化し、この気化した不活性流体の圧力により溶
融樹脂が発泡して樹脂発泡体が得られる。When the pressure of the molten resin is released in the extrusion die of the extruder or the injection mold of the injection molding machine, the supercritical inert fluid impregnated in the molten resin is vaporized, The pressure of the vaporized inert fluid causes the molten resin to foam to obtain a resin foam.
【００２１】この成形に際して、成形機としてクロスヘ
ッドダイを装着した押出機を用い、クロスヘッドダイの
マンドレルに導体を連続的に送り込み、溶融樹脂を被覆
すれば、この導体上に発泡樹脂体からなる絶縁体が被覆
された絶縁電線が得られる。また、Ｔダイを装着した押
出機を用いれば、シート状の樹脂発泡体を得ることがで
き、射出成形機を用いれば、射出金型のキャビティの形
状に応じた形状の樹脂発泡体の成形品が得られる。In this molding, an extruder equipped with a crosshead die is used as a molding machine, a conductor is continuously fed into the mandrel of the crosshead die, and a molten resin is coated on the conductor to form a foamed resin body. An insulated electric wire coated with an insulator is obtained. If an extruder equipped with a T die is used, a sheet-shaped resin foam can be obtained, and if an injection molding machine is used, a resin foam molded product having a shape corresponding to the shape of the cavity of the injection mold. Is obtained.
【００２２】このようにして得られた樹脂発泡体は、発
泡倍率が５〜１５倍、発泡セルの平均径が１〜３００μ
ｍ、平均セル密度が５×１０8〜１×１０11個／ｃｍ3で
あり、均一な発泡形態を有するものとなり、従来の製法
によるものと同等の品質を持つものが製造できる。The resin foam thus obtained has an expansion ratio of 5 to 15 and an average diameter of the foam cells of 1 to 300 μm.
m, the average cell density is 5 × 10 8 to 1 × 10 11 cells / cm 3 , and the cells have a uniform foaming form, and those having the same quality as those produced by the conventional production method can be produced.
【００２３】このような樹脂発泡体の製法によれば、成
形機には、通常の押出機や射出成型機がそのまま使用で
きる。また、超臨界状態の不活性流体の含浸に用いられ
る圧力容器１は、不活性流体の超臨界状態となる圧力お
よび温度に耐える程度であればよく、例えば二酸化炭素
の場合には、圧力７．３５ＭＰａ、温度３１．５℃以上
であればよいので、耐圧耐熱性がさほど高いものでなく
ともよく、さらには昇圧ポンプ４も高能力で高価なもの
でなくてもよく、これらの設備に要する費用を安価にす
ることができる。According to such a method for producing a resin foam, an ordinary extruder or injection molding machine can be used as it is as a molding machine. Further, the pressure vessel 1 used for impregnating the inert fluid in the supercritical state has only to withstand the pressure and temperature at which the inert fluid becomes the supercritical state. For example, in the case of carbon dioxide, the pressure is 7. Since the pressure resistance and heat resistance do not have to be so high since the pressure is 35 MPa and the temperature is 31.5 ° C. or higher, the booster pump 4 does not have to have high performance and high cost, and the cost required for these facilities. Can be cheaper.
【００２４】さらに、成形機での成形条件は、通常の条
件となるので、成形が行いやすく、成形効率が低下する
こともない。また、得られる樹脂発泡体は均一な発泡形
態を有し、品質の良好なものが生産できる。また、得ら
れる発泡体には、不活性流体がほとんど残らないので、
電気的特性が良好であり、アゾジカルボンアミドなどの
化学発泡剤を使用して製造した樹脂発泡体のように、化
学発泡剤の分解物が残って誘電特性などの電気的特性が
低下するなどの不都合もない。Further, since the molding conditions in the molding machine are the usual conditions, the molding is easy and the molding efficiency does not decrease. In addition, the obtained resin foam has a uniform foaming form and can be produced with good quality. Also, since almost no inert fluid remains in the obtained foam,
It has good electrical properties, such as resin foam produced using a chemical foaming agent such as azodicarbonamide, the decomposition products of the chemical foaming agent remain and the electrical characteristics such as dielectric properties deteriorate. There is no inconvenience.
【００２５】以下、具体例を示す。低密度ポリエチレン
のペレット（平均粒径２ｍｍ）２００ｇを、ステンレス
鋼製で内容量５１０ｍｌの圧力容器に入れ、この圧力容
器に液化二酸化炭素１２０ｇを供給し、圧力容器内の圧
力を８ＭＰａ、温度を４０℃として、二酸化炭素を超臨
界状態としてペレットに含浸した。A specific example is shown below. 200 g of low-density polyethylene pellets (average particle diameter 2 mm) were placed in a pressure vessel made of stainless steel and having an internal capacity of 510 ml, 120 g of liquefied carbon dioxide was supplied to this pressure vessel, the pressure in the pressure vessel was 8 MPa, and the temperature was 40 The pellet was impregnated with carbon dioxide in a supercritical state at 0 ° C.
【００２６】含浸時間３０分経過後、ペレットを圧力容
器から取り出し、直ちにクロスヘッドダイ装着押出機の
ホッパーに投入して、温度１９０℃、圧力１０ＭＰａ、
スクリュウ回転数８０ｒｐｍで混練りし、クロスヘッド
ダイのマンドレル内に連続的に送られる径０．５ｍｍの
導体上に押出被覆し、厚さ０．８ｍｍの発泡ポリエチレ
ンからなる絶縁体を有する絶縁電線を製造した。After the impregnation time of 30 minutes, the pellets were taken out of the pressure vessel and immediately put into the hopper of the extruder equipped with a crosshead die, and the temperature was 190 ° C. and the pressure was 10 MPa.
Kneading at a screw rotation speed of 80 rpm, extrusion coating on a conductor with a diameter of 0.5 mm that is continuously fed into the mandrel of the crosshead die, and an insulated wire having an insulator made of expanded polyethylene with a thickness of 0.8 mm Manufactured.
【００２７】この絶縁電線の絶縁体をなす発泡ポリエチ
レンの発泡倍率は１０倍で、平均セル径は５μｍで、平
均セル密度は１０9個／ｃｍ3であった。また、この発泡
ポリエチレンからなる絶縁体の誘電特性を測定したとこ
ろ、誘電率は１．５（２５℃．１ＭＨｚ）であり、誘電
正接（ｔａｎδ）は０．０１（％）であった。The expanded polyethylene forming the insulator of this insulated wire had a foaming ratio of 10 times, an average cell diameter of 5 μm, and an average cell density of 10 9 cells / cm 3 . When the dielectric properties of the foamed polyethylene insulator were measured, the dielectric constant was 1.5 (25 ° C. 0.1 MHz) and the dielectric loss tangent (tan δ) was 0.01 (%).
【００２８】[0028]
【発明の効果】以上説明したように、本発明の樹脂発泡
体の製法は、熱可塑性樹脂の粉粒体を圧力容器に入れ、
この圧力容器内に不活性流体を注入し、この不活性流体
を超臨界状態として粉粒体に含浸せしめ、ついでこの状
態の粉粒体を圧力容器から取り出して、成形機に投入し
成形、発泡せしめるものであるので、従来の超臨界流体
を利用した樹脂発泡体の製法に比較して、特殊な製作費
用が嵩む製造設備を用いる必要がなく、製造コストを低
減することができる。As described above, the method for producing the resin foam of the present invention is as follows.
Inject an inert fluid into this pressure container, impregnate this inert fluid into a supercritical state to impregnate the granular material, then take out the granular material in this state from the pressure container, insert it into a molding machine, form, foam Therefore, compared with the conventional method for manufacturing a resin foam using a supercritical fluid, it is not necessary to use a special manufacturing facility that requires a high manufacturing cost, and the manufacturing cost can be reduced.
【００２９】また、成形機における成形条件も通常の条
件でよく、作業効率が低下することもなく、さらには従
来の製法で製造された樹脂発泡体と同等の品質を有する
ものが製造できる。Further, the molding conditions in the molding machine may be ordinary conditions, the working efficiency does not decrease, and the resin foam having the same quality as the resin foam manufactured by the conventional manufacturing method can be manufactured.
【図１】本発明の樹脂発泡体の製法に用いられる圧力容
器の例を示す概略構成図である。FIG. 1 is a schematic configuration diagram showing an example of a pressure vessel used in a method for producing a resin foam of the present invention.
１・・・圧力容器。 1 ... Pressure vessel.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ２９Ｌ 31:34 Ｂ２９Ｌ 31:34 Ｃ０８Ｌ 101:00 Ｃ０８Ｌ 101:00 Ｆターム(参考） 4F074 AA20 BA32 BA86 CA24 CA34 CA35 CB51 CC32Y CC34Y CC45Y DA02 DA03 DA24 DA48 4F207 AA07 AB02 AD03 AD15 AG03 AG20 AH35 KA01 KA11 KB18 KL58 KL84 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) B29L 31:34 B29L 31:34 C08L 101: 00 C08L 101: 00 F term (reference) 4F074 AA20 BA32 BA86 CA24 CA34 CA35 CB51 CC32Y CC34Y CC45Y DA02 DA03 DA24 DA48 4F207 AA07 AB02 AD03 AD15 AG03 AG20 AH35 KA01 KA11 KB18 KL58 KL84
Claims (3)
この圧力容器内に不活性流体を注入し、この不活性流体
を超臨界状態として粉粒体に含浸せしめ、ついでこの状
態の粉粒体を圧力容器から取り出して、成形機に投入し
成形、発泡せしめることを特徴とする樹脂発泡体の製
法。1. A thermoplastic resin powder is placed in a pressure vessel,
Inject an inert fluid into this pressure container, impregnate this inert fluid into a supercritical state to impregnate the granular material, then take out the granular material in this state from the pressure container, insert it into a molding machine, form, foam A method for producing a resin foam, which is characterized by hardening.
とする請求項１記載の樹脂発泡体の製法。2. The method for producing a resin foam according to claim 1, wherein the inert fluid is carbon dioxide.
出被覆であることを特徴とする請求項１または２記載の
樹脂発泡体の製法。3. The method for producing a resin foam according to claim 1, wherein the molding by a molding machine is extrusion coating of an electric wire by an extruder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002062187A JP2003261707A (en) | 2002-03-07 | 2002-03-07 | Method for producing resin foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002062187A JP2003261707A (en) | 2002-03-07 | 2002-03-07 | Method for producing resin foam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003261707A true JP2003261707A (en) | 2003-09-19 |
Family
ID=29196083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002062187A Withdrawn JP2003261707A (en) | 2002-03-07 | 2002-03-07 | Method for producing resin foam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003261707A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100719487B1 (en) | 2006-04-20 | 2007-05-18 | 한국에너지기술연구원 | Manufacturing method for polyolefin forming material using supercritical fluid |
| WO2008026373A1 (en) * | 2006-08-31 | 2008-03-06 | Japan Science And Technology Agency | Methods of printing on molded resin and molded thermoplastic resins |
| JP2011097578A (en) * | 2009-09-30 | 2011-05-12 | Nitto Denko Corp | Low dielectric sheet for two-dimensional communication, production method therefor, and sheet structure for communication |
| JP2014150571A (en) * | 2009-09-30 | 2014-08-21 | Nitto Denko Corp | Low dielectric sheet for two-dimensional communication, method of manufacturing the same, and sheet structure for communication |
| EP3055353B1 (en) | 2013-10-11 | 2017-08-02 | Basf Se | Method for producing expanded thermoplastic elastomer particles |
| WO2019086144A1 (en) * | 2017-10-31 | 2019-05-09 | Linde Aktiengesellschaft | Method for impregnation a polymeric granulate with a physical blowing agent |
| CN109955423A (en) * | 2019-04-30 | 2019-07-02 | 广东奔迪新材料科技有限公司 | A kind of large-scale ultrahigh pressure thermoplastic polymer foaming and forming apparatus and its method |
| EP3643739A4 (en) * | 2018-09-06 | 2020-12-30 | Guangdong Speed New Material Technology Co., ltd | Method for preparing foamed product of moldless three-dimensional structure by means of supercritical fluid |
| EP3647014A4 (en) * | 2018-09-08 | 2021-05-26 | Guangdong Speed New Material Technology Co., ltd | In-mold foam molding device for thermoplastic polymer particle, and molding method therefor |
-
2002
- 2002-03-07 JP JP2002062187A patent/JP2003261707A/en not_active Withdrawn
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100719487B1 (en) | 2006-04-20 | 2007-05-18 | 한국에너지기술연구원 | Manufacturing method for polyolefin forming material using supercritical fluid |
| WO2008026373A1 (en) * | 2006-08-31 | 2008-03-06 | Japan Science And Technology Agency | Methods of printing on molded resin and molded thermoplastic resins |
| JP2011097578A (en) * | 2009-09-30 | 2011-05-12 | Nitto Denko Corp | Low dielectric sheet for two-dimensional communication, production method therefor, and sheet structure for communication |
| CN102549949A (en) * | 2009-09-30 | 2012-07-04 | 日东电工株式会社 | Low dielectric sheet for 2-d communication, production method therefor, and sheet structure for communication |
| JP2014150571A (en) * | 2009-09-30 | 2014-08-21 | Nitto Denko Corp | Low dielectric sheet for two-dimensional communication, method of manufacturing the same, and sheet structure for communication |
| US10392488B2 (en) | 2013-10-11 | 2019-08-27 | Basf Se | Method for producing expanded thermoplastic elastomer particles |
| EP3055353B1 (en) | 2013-10-11 | 2017-08-02 | Basf Se | Method for producing expanded thermoplastic elastomer particles |
| WO2019086144A1 (en) * | 2017-10-31 | 2019-05-09 | Linde Aktiengesellschaft | Method for impregnation a polymeric granulate with a physical blowing agent |
| US11780118B2 (en) | 2017-10-31 | 2023-10-10 | Messer Industries Usa, Inc. | Method for impregnation a polymeric granulate with a physical blowing agent |
| EP3643739A4 (en) * | 2018-09-06 | 2020-12-30 | Guangdong Speed New Material Technology Co., ltd | Method for preparing foamed product of moldless three-dimensional structure by means of supercritical fluid |
| EP3647014A4 (en) * | 2018-09-08 | 2021-05-26 | Guangdong Speed New Material Technology Co., ltd | In-mold foam molding device for thermoplastic polymer particle, and molding method therefor |
| CN109955423A (en) * | 2019-04-30 | 2019-07-02 | 广东奔迪新材料科技有限公司 | A kind of large-scale ultrahigh pressure thermoplastic polymer foaming and forming apparatus and its method |
| CN109955423B (en) * | 2019-04-30 | 2024-04-02 | 广东奔迪新材料科技有限公司 | Large-scale ultrahigh-pressure thermoplastic polymer foaming molding device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3953558A (en) | Method of moulding foamed synthetic resin pellets of polyolefine | |
| Altan | Thermoplastic foams: Processing, manufacturing, and characterization | |
| KR100339311B1 (en) | Addition method of supercritical carbon dioxide, and production process of expanded thermoplastic resin product by making use of the addition method | |
| US4255368A (en) | Structural foam molding process | |
| TWI673156B (en) | Single-phase solution molding method | |
| US7083403B2 (en) | Apparatus for supplying a resin material to an injection molding machine | |
| Yusa et al. | A new microcellular foam injection‐molding technology using non‐supercritical fluid physical blowing agents | |
| CN105829049A (en) | Apparatus And Method For The Production Of Expanded Foam Embryos | |
| US9080023B2 (en) | Foam molding method, foaming agent and foamed plastic | |
| JPS583836A (en) | Method and device for extruding foamed product | |
| JP2003261707A (en) | Method for producing resin foam | |
| EP1393879B1 (en) | Forming device for thermoplastic resin formed part | |
| WO2001068346A1 (en) | Method and device for injection-molding thermoplastic resin formed product | |
| WO2005105404A1 (en) | Molding method and apparatus for expandable polymer resin | |
| JPH0885129A (en) | Method and apparatus for producing foamed structure | |
| WO1996025281A1 (en) | Polymeric foam preparation | |
| JP3780236B2 (en) | How to store gas-penetrated material | |
| JPS5912455B2 (en) | Method and apparatus for producing polyolefin synthetic resin foam moldings | |
| JPH0885128A (en) | Method and apparatus for producing thermoplastic resin foamed molded object | |
| JP2002264164A (en) | Resin composition for injection foaming | |
| JP2003039512A (en) | Thermoplastic resin foamed molded object | |
| JP2002337186A (en) | Method for supplying material to injection molding machine or extrusion machine | |
| JP2603859B2 (en) | Method for producing injection molded foam | |
| Goodship et al. | Microcellular foaming with supercritical CO2 in injection moulding | |
| Taskin | Polymeric Foams: Materials, Technology, and Applications |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20050510 |