JP2000309659A - Production of regenerated foaming styrenic resin particle, regenerated foaming styrenic resin particle obtained by the production method, and molding of the foaming styrenic resin - Google Patents
Production of regenerated foaming styrenic resin particle, regenerated foaming styrenic resin particle obtained by the production method, and molding of the foaming styrenic resinInfo
- Publication number
- JP2000309659A JP2000309659A JP11774199A JP11774199A JP2000309659A JP 2000309659 A JP2000309659 A JP 2000309659A JP 11774199 A JP11774199 A JP 11774199A JP 11774199 A JP11774199 A JP 11774199A JP 2000309659 A JP2000309659 A JP 2000309659A
- Authority
- JP
- Japan
- Prior art keywords
- styrenic resin
- styrene
- regenerated
- resin particles
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Molding Of Porous Articles (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
Description
【０００１】[0001]
【発明に属する技術分野】本発明は、流動性（メルトフ
ローインデックス）が５〜１５g／１０分の範囲にある
発泡性スチレン系樹脂を、押出機でペレットにした後、
発泡剤を含浸して得られる再生発泡性スチレン系樹脂粒
子の製造法、この製造法により得られる再生発泡性スチ
レン系樹脂粒子及び発泡スチレン系樹脂成形品に関す
る。BACKGROUND OF THE INVENTION The present invention relates to a foamable styrene resin having a fluidity (melt flow index) in a range of 5 to 15 g / 10 min.
The present invention relates to a method for producing regenerated foamable styrene resin particles obtained by impregnating a foaming agent, a regenerated foamable styrene resin particle obtained by the production method, and a foamed styrene resin molded article.
【０００２】[0002]
【従来の技術】従来より、スチレン系樹脂の果たす役割
は大きく、生活用品から工業材料まで多方面に使用され
ている。スチレン系樹脂の製造法としては、スチレンモ
ノマーを水性媒体中に懸濁させ、重合開始剤または熱に
よりラジカル重合して樹脂粒子を得る方法、またはスチ
レンモノマーを塊状重合あるいは乳化重合してペレット
状とする方法等が知られている。2. Description of the Related Art Conventionally, styrene resins play a large role, and are used in various fields from household goods to industrial materials. As a method for producing a styrene-based resin, a method in which a styrene monomer is suspended in an aqueous medium and radical polymerization is performed by a polymerization initiator or heat to obtain resin particles, or a method in which the styrene monomer is subjected to bulk polymerization or emulsion polymerization to form a pellet. There are known methods.
【０００３】近年、発泡性スチレン系樹脂粒子の製造時
の規格外品及び発泡スチレン系樹脂成形体の廃棄物を資
源として再利用するリサイクルする技術、または高付加
価値品の開発は盛んになっている。スチレン系樹脂発泡
成形体は使用後は焼却処分されるか、または熱収縮さ
れ、熱収縮塊の形で回収される。製造時の規格外品、熱
収縮された熱収縮塊等は、主に射出成形による雑貨品、
押出成形による建材等の限られた用途にのみ利用され、
その用途の拡大が急がれている。[0003] In recent years, there has been active development of technologies for recycling non-standardized products during the production of expandable styrenic resin particles and wastes of foamed styrenic resin molded products as resources, or high value-added products. I have. After use, the styrene-based resin foam molded article is incinerated or heat-shrinked, and is recovered in the form of a heat-shrinkable mass. Non-standard products at the time of manufacture, heat-shrinkable heat-shrinkable lump, etc. are mainly miscellaneous goods by injection molding,
Used only for limited applications such as building materials by extrusion,
Its use is urgently expanding.
【０００４】一方、リサイクルという定義から、発泡性
スチレン系樹脂粒子を発泡成形し、最終的にスチレン系
樹脂発泡成形体として使用されたスチレン系樹脂を、ス
チレン系樹脂粒子として利用するのではなく、発泡性ス
チレン系樹脂粒子として再利用することが好ましいと考
えられる。しかし、現在のところスチレン系樹脂発泡成
形体から回収された熱収縮塊を発泡性スチレン系樹脂粒
子として工業的に再生されている例は少ない。[0004] On the other hand, from the definition of recycling, foamable styrene resin particles are not foamed, and the styrene resin finally used as the styrene resin foam molded article is not used as styrene resin particles. It is considered that it is preferable to reuse as expandable styrene resin particles. However, at present, there are few examples in which a heat-shrinkable lump recovered from a styrene-based resin foam molded article is industrially regenerated as expandable styrene-based resin particles.
【０００５】発泡スチレン系樹脂成形品の熱収縮塊等か
ら発泡性スチレン系樹脂粒子を再生する方法として、上
記熱収縮塊を粉砕し押出機でペレット状にして、これに
発泡剤を含浸する方法が最も一般的であると考えられ
る。しかし、押出機においてストラント゛タ゛イス／ヘ゜レタイサ゛ーでペ
レット状とした場合、樹脂はヘ゜レタイサ゛ーの巻き込み回転に
より、延伸方向に引っ張り応力が加わり、冷却、固化し
て得られるスチレン系樹脂には延伸ひずみが生じる。こ
のため、発泡剤を含浸すると樹脂が軟化されると同時に
延伸ひずみの緩和が起こり、得られた発泡性スチレン系
樹脂は延伸方向に収縮し、発泡性スチレン系樹脂粒子の
形状が扁平状となる問題があった。[0005] As a method for regenerating expandable styrene resin particles from a heat-shrinkable mass of a foamed styrene-based resin molded article, a method in which the heat-shrinkable mass is pulverized, formed into pellets by an extruder, and impregnated with a foaming agent. Is considered the most common. However, when the extruder is used to form pellets with a strand type / pelletizer, the resin is subjected to a tensile stress in the stretching direction due to the rotation of the pelletizer, and a stretching strain is generated in the styrene resin obtained by cooling and solidifying. For this reason, when the foaming agent is impregnated, the resin is softened and the stretching strain is relaxed at the same time, and the obtained expandable styrene resin contracts in the stretching direction, and the shape of the expandable styrene resin particles becomes flat. There was a problem.
【０００６】そこで、ペレットに延伸応力を加えぬよう
に、ダイスから押し出された樹脂をダイス面で回転カッ
ターによりカットするミニペレット法や、押出機内で溶
融した樹脂に発泡剤を圧入して実質的に未発泡の状態で
ペレット状に押し出すクエンチ法（ガス含浸法）などが
開発されたが生産性が悪い上にコスト面で不利であり、
工業的に実用化することは難しいと考えられる。[0006] Therefore, a mini-pellet method in which the resin extruded from the die is cut by a rotary cutter on the die surface so as not to apply stretching stress to the pellet, or a foaming agent is pressed into the molten resin in the extruder to substantially reduce the pressure. A quench method (gas impregnation method), which extrudes pellets in an unfoamed state, has been developed, but this method is disadvantageous in terms of productivity and cost.
It is considered difficult to commercialize it industrially.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、上記のミニ
ペレット法またははクエンチ法を用いずに、比較的生産
能力の高い押出機（ストラント゛タ゛イス／ヘ゜レタイサ゛ー）によりペレ
ット状にした後、発泡剤を含浸させて発泡性スチレン系
樹脂粒子とした場合、その形状が扁平状でなく球状の再
生発泡性スチレン系樹脂粒子を得る製造法、この製造法
により得られる再生発泡性スチレン系樹脂粒子及びこの
粒子を発泡成形して得られる発泡スチレン系樹脂成形品
を提供するものである。SUMMARY OF THE INVENTION The present invention relates to a foaming agent which is prepared by using an extruder (strand type / pelletizer) having a relatively high production capacity without using the above-mentioned mini-pellet method or quench method. When the foamed styrene-based resin particles are impregnated with the styrene resin particles, a method for obtaining regenerated foamable styrene-based resin particles whose shape is not flat but spherical is used. An object of the present invention is to provide a foamed styrene resin molded article obtained by foaming and molding particles.
【０００８】[0008]
【課題を解決するための手段】本発明は、樹脂流動性
（メルトフローインデックス）が５〜１５g／１０分の
範囲にある発泡性スチレン系樹脂を、押出機の加熱温度
を２２０〜２６０℃としてペレットにした後、発泡剤を
含浸する再生発泡性スチレン系樹脂粒子の製造法、この
製造法により得られる再生発泡性スチレン系樹脂粒子及
び発泡スチレン系樹脂成形品に関する。According to the present invention, a foamable styrene resin having a resin flowability (melt flow index) in the range of 5 to 15 g / 10 minutes is prepared by setting the extruder to a heating temperature of 220 to 260 ° C. The present invention relates to a method for producing regenerated foamable styrene-based resin particles which are formed into pellets and impregnated with a foaming agent, a regenerated foamable styrene-based resin particle obtained by the production method, and a molded article of expanded styrene-based resin.
【０００９】本発明においては、ペレットの直径が押出
機のダイス径に対して、０．４〜０．６であることが好
ましい。また、本発明においては、ペレットの長さが押
出機のダイス径に対して、０．７〜１．０であることが
好ましい。In the present invention, the diameter of the pellet is preferably 0.4 to 0.6 with respect to the die diameter of the extruder. In the present invention, the length of the pellet is preferably 0.7 to 1.0 with respect to the die diameter of the extruder.
【００１０】[0010]
【発明の実施の形態】次に、本発明の再生発泡性スチレ
ン系樹脂粒子の製造法、この製造法により得られる再生
発泡性スチレン系樹脂粒子及び発泡スチレン系成形品の
実施の形態について説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a method for producing regenerated foamable styrene resin particles of the present invention, and regenerated foamable styrene resin particles and a foamed styrene molded article obtained by the production method will be described. .
【００１１】本発明における樹脂流動性（メルトフロー
インデックス）の測定は、JIS K 7210 に準じて行なわ
れる。すなわち、発泡性スチレン系樹脂に２００℃で５
kgf／cm2の荷重をかけ、１ｍｍの円筒から１０分間に流
れ出る樹脂量を測定した。本発明におけるスチレン系樹
脂の樹脂流動性は５〜１５g/10分の範囲とされる。樹脂
流動性が５g/10分未満であると、得られた再生発泡性ス
チレン系樹脂粒子の形状がタマゴ状となってしまい、ま
た１５g/10分を超えると、スチレン系樹脂が過度に軟化
されるため、カット不良で所定の大きさのペレットを得
ることが出来ない。The measurement of the resin fluidity (melt flow index) in the present invention is performed according to JIS K7210. That is, at 200 ° C., 5
A load of kgf / cm 2 was applied, and the amount of resin flowing out of the 1 mm cylinder in 10 minutes was measured. The resin flowability of the styrenic resin in the present invention is in the range of 5 to 15 g / 10 minutes. When the resin fluidity is less than 5 g / 10 minutes, the shape of the obtained regenerated foamable styrene-based resin particles becomes egg-like, and when the resin flowability exceeds 15 g / 10 minutes, the styrene-based resin is excessively softened. Therefore, pellets of a predetermined size cannot be obtained due to defective cutting.
【００１２】本発明においては、スチレン系樹脂発泡成
形体の熱収縮塊またはビーズ状のスチレン系樹脂をストラン
ト゛タ゛イス／ヘ゜レタイサ゛ー方式の押出機でペレットにする際、押
出機の加熱温度は２２０〜２６０℃の範囲とされる。上
記の加熱温度では延伸方向に引っ張り応力が加わりにく
く、得られるスチレン系樹脂には延伸ひずみが残留しに
くいため、発泡剤を含浸して得られる再生発泡性スチレ
ン系樹脂粒子は収縮がなく球状となる。加熱温度が２２
０℃未満では、樹脂に引っ張り応力が加わり延伸ひずみ
が残留するため、発泡剤を含浸して得られる再生発泡性
スチレン系樹脂粒子は収縮し扁平状となる。また加熱温
度が２６０℃を超えると、樹脂が過度に軟化されるため
カット不良を引き起こす。In the present invention, when extruding a heat-shrinkable lump or bead-like styrene-based resin of a styrene-based resin foam molded article into pellets with a strand type / pelletizer type extruder, the heating temperature of the extruder is 220 to 260 ° C. Range. At the above heating temperature, tensile stress is not easily applied in the stretching direction, and stretching strain hardly remains in the obtained styrene-based resin, so that the regenerated foamable styrene-based resin particles obtained by impregnating with a blowing agent do not shrink and have a spherical shape. Become. Heating temperature is 22
If the temperature is lower than 0 ° C., since tensile stress is applied to the resin and stretching strain remains, the regenerated foamable styrene resin particles obtained by impregnating the foaming agent shrink and become flat. On the other hand, if the heating temperature exceeds 260 ° C., the resin is excessively softened, resulting in poor cutting.
【００１３】本発明においては、スチレン系樹脂のペレ
ットの直径は押出機のダイス径に対して０．４〜０．６
にカットすることが好ましい。ペレットの直径が押出機
のダイス径に対して０．４未満では、延伸方向に引張り
応力が加わり、発泡剤を含浸すると、発泡粒子の形状が
扁平状になる傾向があり、また０．６を超えると、粒子
の体積が大きくなりスチレン系樹脂粒子の中心部分に芯
とよばれる未含浸部分ができ、予備発泡した際に、一つ
の発泡粒子内に発泡部分と未発泡部分が混在する傾向が
ある。In the present invention, the diameter of the styrene resin pellet is 0.4 to 0.6 with respect to the die diameter of the extruder.
It is preferable to cut into pieces. If the diameter of the pellet is less than 0.4 with respect to the die diameter of the extruder, a tensile stress is applied in the stretching direction, and when the foaming agent is impregnated, the shape of the foamed particles tends to be flat, and 0.6 If it exceeds, the volume of the particles becomes large and an unimpregnated portion called a core is formed at the center of the styrene-based resin particles, and when pre-expanded, the expanded portion and the unexpanded portion tend to be mixed in one expanded particle. is there.
【００１４】本発明においては、スチレン系樹脂のペレ
ットの長さは、ダイス径に対して０．７〜１．０にカッ
トすることが好ましい。ペレットの長さがダイス径に対
して０．７未満では、発泡剤を含浸すると、発泡粒子形
状が円盤状になる傾向があり、また１．０を超えると、
発泡剤を含浸して得た再生発泡性スチレン系樹脂粒子の
形状が長細くタマゴ状となってしまい、予備発泡粒子と
し金型内に充填するときに、肉厚の薄い部分がある場合
に発泡粒子が均一に充填せず、外観の良好な成形品が得
られない傾向がある。In the present invention, the length of the styrene resin pellet is preferably cut to 0.7 to 1.0 with respect to the die diameter. If the length of the pellet is less than 0.7 with respect to the die diameter, when the foaming agent is impregnated, the foamed particle shape tends to be disc-shaped, and when it exceeds 1.0,
The regenerated expandable styrenic resin particles obtained by impregnating the foaming agent become long and slender egg-shaped, and when pre-expanded particles are filled into the mold, foaming occurs when there is a thin part. There is a tendency that the particles are not uniformly filled and a molded article having good appearance is not obtained.
【００１５】本発明におけるスチレン系樹脂とは、スチ
レンを主成分として５０重量％以上含む共重合体、また
はポリスチレンを５０重量％以上を有する樹脂混合物を
いう。スチレンと共重合させうる共重合成分として、ア
クリロニトル、ブタジエン、アクリル酸エステル、メタ
クリル酸、無水マレイン酸等が挙げられ、ポリスチレン
と混合しうる樹脂としては、ポリアクリロニトリル、ポ
リブタジエン、ポリアクリル酸エステル、ポリメタクリ
ル酸エステル、ポリエチレン、ポリ酢酸ビニル等が挙げ
られる。The styrenic resin in the present invention refers to a copolymer containing styrene as a main component at 50% by weight or more, or a resin mixture containing polystyrene at 50% by weight or more. Examples of copolymerizable components that can be copolymerized with styrene include acrylonitrile, butadiene, acrylates, methacrylic acid, and maleic anhydride.Examples of resins that can be mixed with polystyrene include polyacrylonitrile, polybutadiene, polyacrylate, and polyacrylate. Examples include methacrylic acid esters, polyethylene, polyvinyl acetate and the like.
【００１６】本発明におけるスチレン系樹脂には、通常
成形材料を製造する際に添加される顔料、滑剤、酸化防
止剤、紫外線吸収剤などが含まれていてもよい。また、
スチレン系樹脂を主成分とした樹脂材料に他の素材、例
えば、ガラス、炭素、炭酸カルシウム、タルクなど無機
物、金、銀、銅などの金属類が混合されていてもよい。The styrenic resin in the present invention may contain a pigment, a lubricant, an antioxidant, an ultraviolet absorber and the like which are usually added when manufacturing a molding material. Also,
Other materials, for example, inorganic materials such as glass, carbon, calcium carbonate, and talc, and metals such as gold, silver, and copper may be mixed with a resin material containing a styrene-based resin as a main component.
【００１７】本発明におけるペレットへの発泡剤の含浸
は、ペレットを有機高分子系分散剤を含む水性媒体中に
懸濁させた状態で、加熱保持し発泡剤を圧入する方法に
より行われる。この工程に使用する装置としては、攪拌
羽根付きの耐圧反応容器が好ましい。The impregnation of the pellets with the blowing agent in the present invention is carried out by a method in which the pellets are suspended in an aqueous medium containing an organic polymer dispersant, heated and held, and the blowing agent is injected. As a device used in this step, a pressure-resistant reaction vessel equipped with a stirring blade is preferable.
【００１８】本発明における発泡剤を含浸する分散剤
は、有機高分子系分散剤や難溶性無機塩などが使用さ
れ、両者を併用することも出来る。有機高分子系分散剤
としては、ポリビニルアルコール、ポリビニルプロリド
ン等が挙げられ、その使用量は発泡性スチレン系樹脂に
対して０．００５〜０．１重量％が好ましく、難溶性無
機塩としてはリン酸マグネシウム、ピロリン酸マグネシ
ウム、リン酸三カルシウム等を挙げられ、その使用量は
発泡性スチレン系樹脂に対して０．１〜１重量％の範囲
内で使用することが好ましい。またこれら分散剤と微量
の界面活性剤を併用しても良い。As the dispersant for impregnating the foaming agent in the present invention, an organic polymer-based dispersant, a hardly soluble inorganic salt, or the like is used, and both may be used in combination. Examples of the organic polymer-based dispersant include polyvinyl alcohol, polyvinyl prolidone, and the like. The amount of the organic polymer-based dispersant is preferably 0.005 to 0.1% by weight based on the expandable styrene resin. Examples thereof include magnesium phosphate, magnesium pyrophosphate, and tricalcium phosphate, and the use amount thereof is preferably in the range of 0.1 to 1% by weight based on the expandable styrene resin. These dispersants may be used in combination with a trace amount of a surfactant.
【００１９】本発明で用いられる発泡剤としては、例え
ばプロパン、ｎ−ブタン、イソブタン、ペンタン、ヘキ
サン、へプタン、石油エーテル等の脂肪族炭化水素及び
シクロペンタン、シクロヘキサン等の環状脂肪族炭化水
素などを挙げることができる。発泡剤の添加量は、発泡
性スチレン系樹脂に対して６〜１２重量％が好ましく、
８〜１０重量％がより好ましい。発泡剤の添加量が６重
量％未満では、得られた再生発泡性スチレン系樹脂を加
熱して予備発泡粒子とする際、発泡能力が不十分となり
高倍率に発泡できない傾向があり、また１２重量％を越
えると懸濁の安定が低下し、合一粒子が生じやすくな
り、かつ得られた予備発泡粒子の気泡径が大きくなっ
て、機械的物性の低下を招く傾向がある。Examples of the foaming agent used in the present invention include aliphatic hydrocarbons such as propane, n-butane, isobutane, pentane, hexane, heptane and petroleum ether, and cyclic aliphatic hydrocarbons such as cyclopentane and cyclohexane. Can be mentioned. The amount of the foaming agent is preferably 6 to 12% by weight based on the foamable styrene resin.
8 to 10% by weight is more preferred. When the added amount of the foaming agent is less than 6% by weight, when the obtained regenerated foamable styrenic resin is heated to obtain pre-expanded particles, the foaming ability tends to be insufficient and foaming at a high magnification tends to be impossible, and 12% by weight. %, The stability of the suspension is reduced, coalesced particles are likely to be formed, and the bubble diameter of the obtained pre-expanded particles tends to increase, leading to a decrease in mechanical properties.
【００２０】本発明における発泡剤の含浸温度は、９０
〜１３０℃が好ましく、１００〜１２０℃がより好まし
い。含浸温度が９０℃未満であると、得られる再生発泡
性スチレン系樹脂粒子が球状とならない傾向があり、ま
た１３０℃を超えると、懸濁の安定性が低下し、合一粒
子が生じやすくなる傾向がある。また発泡剤の含浸時間
は、５時間以上が好ましく、６時間以上がより好まし
い。含浸時間が５時間未満であると、得られた再生発泡
性スチレン系樹脂粒子が球状とならない傾向がある。The impregnation temperature of the blowing agent in the present invention is 90
To 130 ° C is preferable, and 100 to 120 ° C is more preferable. When the impregnation temperature is less than 90 ° C., the obtained regenerated foamable styrene-based resin particles tend not to be spherical, and when the temperature exceeds 130 ° C., the stability of the suspension is reduced, and coalesced particles are easily generated. Tend. The impregnation time of the foaming agent is preferably 5 hours or more, more preferably 6 hours or more. When the impregnation time is less than 5 hours, the obtained regenerated foamable styrene resin particles tend not to be spherical.
【００２１】本発明においては、上記水性媒体中に通常
用いられる可塑剤、気泡調整剤等を添加することができ
る。可塑剤としてはスチレン単量体、トルエン、エチル
ベンゼン、パラフィン等、気泡調整剤としてはアミド化
合物、非イオン系の界面活性剤等を挙げられる。In the present invention, a plasticizer, a cell regulator and the like which are usually used can be added to the aqueous medium. Examples of the plasticizer include styrene monomer, toluene, ethylbenzene, paraffin and the like, and examples of the cell regulator include an amide compound and a nonionic surfactant.
【００２２】本発明において得られた再生発泡性スチレ
ン系樹脂粒子は、脱水、乾燥した後、適宜分級され、ま
た改質剤により表面被覆することができる。これらの諸
工程は従来既知の方法が適用できる。The regenerated foamable styrenic resin particles obtained in the present invention can be appropriately classified after dewatering and drying, and can be surface-coated with a modifier. Conventionally known methods can be applied to these various steps.
【００２３】[0023]
【実施例】次に実施例により本発明を詳細に説明する
が、本発明はこれらにより制限されるものではない。Next, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto.
【００２４】実施例１ 樹脂流動性（メルトフローインデックス）が５．１g／
１０分の発泡性ポリスチレン樹脂１２００ｇを、押出機
（池貝鉄鋼株式会社製、ＰＣＭ−３０）のストランドダ
イスの径が３ｍｍのものを用いて、加熱温度２４０℃で
押し出した後、ペレタイザーにより、ペレットの直径が
１．５ｍｍ、長さが２．３ｍｍとなるようカットした。
内容積４リットルのオートクレーブに水２１００ｇ及び
懸濁剤としてポリビニルアルコール（日本合成化学工業
製、ゴーセノール KH-20）２５ｇ、リン酸三カルシウム
６３ｇ、活性剤としてドデシルベンゼンスルホン酸ナト
リウム１．３ｇを加えて水性媒体とした。次に上記のペ
レット９００ｇを攪拌速度３００ｒｐｍで懸濁した。そ
の後９０℃まで一定昇温し混合ブタン（ｉーブタン／ｎ
ーブタン比＝４／６：重量比）を４３ｇづつ、２回に分
けて圧入し、１１５℃まで昇温して８時間以上保持し、
３０℃以下になるまで冷却して取り出し、再生発泡性ス
チレン系樹脂粒子を得た。Example 1 Resin fluidity (melt flow index) was 5.1 g /
After extruding 1200 g of expandable polystyrene resin for 10 minutes at a heating temperature of 240 ° C. by using an extruder (PCM-30, manufactured by Ikegai Iron and Steel Co., Ltd.) having a diameter of 3 mm, the pelletizing was performed by a pelletizer. Cutting was performed so that the diameter was 1.5 mm and the length was 2.3 mm.
To an autoclave having an inner volume of 4 liters, 2100 g of water, 25 g of polyvinyl alcohol (Gohsenol KH-20, manufactured by Nippon Synthetic Chemical Industry) as a suspending agent, 63 g of tricalcium phosphate, and 1.3 g of sodium dodecylbenzenesulfonate as an activator were added. An aqueous medium was used. Next, 900 g of the above pellets were suspended at a stirring speed of 300 rpm. Thereafter, the temperature was raised to 90 ° C. and the mixed butane (i-butane / n
(Butane ratio = 4/6: weight ratio) was press-fitted in two portions of 43 g each, heated to 115 ° C. and held for 8 hours or more.
The mixture was cooled to 30 ° C. or lower and taken out to obtain regenerated foamable styrene resin particles.
【００２５】得られた再生発泡性スチレン系樹脂粒子は
球状であった。この再生発泡性スチレン系樹脂粒子を内
容積３５リットルのバッチ発泡機に投入し、吹き込み蒸
気圧０．３kgf／cm2で、嵩密度０．０２g／cm3の予備発
泡粒子を得た。得られた予備発泡粒子を２４時間放置し
た後、発泡スチレン系樹脂成形機（ダイセン工業製、Ｖ
Ｓ−５００）を用いて発泡成形品を得た。得られた発泡
成形品は、発泡粒子同士の融着も良く、外観の良好なも
のであった。試験結果をまとめて表１に示す。The regenerated foamable styrene resin particles obtained were spherical. The regenerated foamable styrene-based resin particles were charged into a batch foaming machine having an internal volume of 35 liters, and pre-expanded particles having a blown vapor pressure of 0.3 kgf / cm 2 and a bulk density of 0.02 g / cm 3 were obtained. After leaving the obtained pre-expanded particles for 24 hours, a foamed styrene resin molding machine (manufactured by Daisen Industries, V
S-500) to obtain a foam molded article. The obtained foamed molded product had good fusion between the foamed particles and had a good appearance. Table 1 summarizes the test results.
【００２６】実施例２ 樹脂流動性（メルトフローインデックス）が７．７g／
１０分の発泡性ポリスチレン樹脂１２００ｇを、加熱温
度２４０℃で押し出し、ペレットの直径が１．４ｍｍ、
長さが２．２ｍｍとなるようカットした以外は実施例１
と同様にして再生発泡性スチレン系樹脂粒子を製造し
た。Example 2 Resin fluidity (melt flow index) was 7.7 g /
1200 g of expandable polystyrene resin for 10 minutes was extruded at a heating temperature of 240 ° C., and the pellet diameter was 1.4 mm.
Example 1 except that the length was cut to be 2.2 mm.
In the same manner as in the above, regenerated foamable styrene resin particles were produced.
【００２７】得られた再生発泡性スチレン系樹脂粒子の
形状は球形であり、発泡成形体にしたときの融着性、外
観とも良好であった。試験結果をまとめて表１に示す。The shape of the regenerated foamable styrene resin particles obtained was spherical, and both the fusion property and the appearance of the foamed molded article were good. Table 1 summarizes the test results.
【００２８】実施例３ 樹脂流動性（メルトフローインデックス）が１３．４g
／１０分の発泡性ポリスチレン樹脂１２００ｇを、加熱
温度２４０℃で押し出し、ペレットの直径が１．８ｍ
ｍ、長さが２．８ｍｍとなるようカットした以外は実施
例１と同様にして再生発泡性スチレン系樹脂粒子を製造
した。Example 3 Resin fluidity (melt flow index) is 13.4 g
The extrudable polystyrene resin (1200 g) was extruded at a heating temperature of 240 ° C. and the pellet diameter was 1.8 m.
Regenerated foamable styrene resin particles were produced in the same manner as in Example 1 except that the m and the length were cut to be 2.8 mm.
【００２９】得られた再生発泡性スチレン系樹脂粒子の
形状は球形であり、発泡成形体にしたときの融着性、外
観とも良好であった。試験結果をまとめて表１に示す。The shape of the regenerated foamable styrenic resin particles obtained was spherical, and the fusion-adhesion and appearance of the foamed molded article were good. Table 1 summarizes the test results.
【００３０】比較例１ 樹脂流動性（メルトフローインデックス）が７．６g／
１０分の発泡性ポリスチレン樹脂１２００ｇを、加熱温
度２００℃で押し出し、ペレットの直径が１．５ｍｍ、
長さが２．８ｍｍとなるようカットした。上記ペレット
を実施例１と同様にして再生発泡性スチレン系樹脂粒子
を製造した。Comparative Example 1 Resin fluidity (melt flow index) was 7.6 g /
1200 g of expandable polystyrene resin for 10 minutes was extruded at a heating temperature of 200 ° C., and the pellet diameter was 1.5 mm.
It cut so that length might be set to 2.8 mm. Regenerated foamable styrene resin particles were produced from the above pellets in the same manner as in Example 1.
【００３１】得られた再生発泡性スチレン系樹脂粒子の
形状は扁平となっており、それを予備発泡粒子として金
型内に充填したとき、型の肉厚が薄い部分では発泡粒子
が均一に充填せず、良好な発泡成形品が得られなかっ
た。試験結果をまとめて表１に示す。The shape of the obtained regenerated foamable styrene resin particles is flat, and when the regenerated foamable styrene resin particles are filled in a mold as pre-expanded particles, the foamed particles are uniformly filled in a portion where the thickness of the mold is small. No good foamed molded product was obtained. Table 1 summarizes the test results.
【００３２】比較例２ 樹脂流動性（メルトフローインデックス）が３．１g／
１０分の発泡性ポリスチレン樹脂１２００ｇを、加熱温
度２００℃で押し出し、ペレットの直径が１．６ｍｍ、
長さが２．８ｍｍとなるようカットした以外は実施例１
と同様にして再生発泡性スチレン系樹脂粒子を製造し
た。Comparative Example 2 Resin fluidity (melt flow index) was 3.1 g /
Extruded 1200 g of expandable polystyrene resin for 10 minutes at a heating temperature of 200 ° C., the pellet diameter was 1.6 mm,
Example 1 except that the length was cut to be 2.8 mm.
In the same manner as in the above, regenerated foamable styrene resin particles were produced.
【００３３】得られた再生発泡性スチレン系樹脂粒子の
形状は扁平となっており、それを予備発泡粒子として金
型内に充填したとき、型の肉厚が薄い部分では発泡粒子
が均一に充填せず、良好な成形品が得られなかった。試
験結果をまとめて表１に示す。The shape of the obtained regenerated foamable styrene resin particles is flat, and when the regenerated foamable styrene resin particles are filled in a mold as pre-expanded particles, the foamed particles are uniformly filled in a portion where the thickness of the mold is small. No good molded product was obtained. Table 1 summarizes the test results.
【００３４】比較例３ 樹脂流動性（メルトフローインデックス）が１３．７g
／１０分の発泡性ポリスチレン樹脂１２００ｇを、加熱
温度を２００℃で押し出し、ペレットの直径が１．８ｍ
ｍ、長さが３．０ｍｍとなるようカットした以外は実施
例１と同様にして再生発泡性スチレン系樹脂粒子を製造
した。Comparative Example 3 Resin fluidity (melt flow index) was 13.7 g.
The extrudable polystyrene resin (1200 g) was extruded at a heating temperature of 200 ° C. and the pellet diameter was 1.8 m.
Regenerated foamable styrene resin particles were produced in the same manner as in Example 1 except that the m and the length were cut to be 3.0 mm.
【００３５】得られた再生発泡性スチレン系樹脂粒子の
形状は扁平となっており、それを予備発泡粒子として金
型内に充填したとき、型の肉厚が薄い部分では発泡粒子
が均一に充填せず、良好な成形品が得られなかった。試
験結果をまとめて表１に示す。The obtained regenerated foamable styrene resin particles have a flat shape, and when they are filled in a mold as pre-expanded particles, the foamed particles are uniformly filled in a portion where the thickness of the mold is small. No good molded product was obtained. Table 1 summarizes the test results.
【００３６】比較例４ 樹脂流動性（メルトフローインデックス）が３．０g／
１０分の発泡性ポリスチレン樹脂１２００ｇを、加熱温
度を２４０℃で押し出し、ペレットの直径が１．８ｍ
ｍ、長さが３．５ｍｍとなるようカットした。上記ペレ
ットを実施例１と同様にして再生発泡性スチレン系樹脂
粒子を製造した。Comparative Example 4 Resin fluidity (melt flow index) was 3.0 g /
A heating temperature of 240 ° C. extruded 1200 g of expandable polystyrene resin for 10 minutes, and the pellet diameter was 1.8 m.
m, and cut so as to have a length of 3.5 mm. Regenerated foamable styrene resin particles were produced from the above pellets in the same manner as in Example 1.
【００３７】得られた再生発泡性スチレン系樹脂粒子の
形状はタマゴ状となっており、それを予備発泡粒子して
成形体したとき、融着が良好であるが、成形品外観に凹
部が多かった。試験結果をまとめて表１に示す。The regenerated foamable styrenic resin particles obtained have an egg-like shape. When they are pre-expanded and molded into a compact, the fusion is good, but the appearance of the molded product has many recesses. Was. Table 1 summarizes the test results.
【００３８】比較例５ 樹脂流動性（メルトフローインデックス）が１６．０g
／１０分の発泡性ポリスチレン樹脂１２００ｇを、加熱
温度２４０℃で押し出したが、樹脂が過度に軟化され、
カット不良で所定の大きさのペレットを得ることが出来
なかった。試験結果をまとめて表１に示す。Comparative Example 5 Resin fluidity (melt flow index) was 16.0 g.
1200 g of expandable polystyrene resin of / 10 min was extruded at a heating temperature of 240 ° C., but the resin was excessively softened,
Pellets of a predetermined size could not be obtained due to poor cutting. Table 1 summarizes the test results.
【００３９】[0039]
【表１】 [Table 1]
【００４０】[0040]
【発明の効果】本発明により得られる再生発泡性スチレ
ン系樹脂粒子は球状であり、これにより外観及び融着が
良好な発泡スチレン系樹脂成形品を得ることができる。The regenerated foamable styrene-based resin particles obtained by the present invention are spherical, whereby a foamed styrene-based resin molded article having good appearance and fusion can be obtained.
───────────────────────────────────────────────────── 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） Ｂ２９Ｋ 25:00 105:04 Ｃ０８Ｌ 25:06 (72)発明者 中岫 弘 千葉県市原市五井南海岸14番地 日立化成 工業株式会社五井工場内 (72)発明者 服部 勇 千葉県市原市五井南海岸14番地 日立化成 工業株式会社五井工場内 Ｆターム(参考） 4F074 AA09 AA12 AA17 AA32 AA41 BA36 BA37 BA38 BA39 BA40 BC01 CA23 CA34 CA35 CA38 CA39 CA48 CA49 CA51 CC04X CC05X CC24X CC32X CC32Y CC45 4F201 AA13 AC01 AG20 AH26 AH48 BA02 BC01 BC13 BC17 BC19 BC21 BD05 BL12 BL42 BL48 4F212 AA13 AC01 AG20 AH26 AH48 UA01 UB01 UE30 4F301 AA15 AD02 AD10 BA01 BA21 BC26 BD08 BF16 BF29 BF32 CA09 CA11 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) B29K 25:00 105: 04 C08L 25:06 (72) Inventor Hiroshi Nakaikui 14 Goi south coast, Ichihara city, Chiba prefecture Address Hitachi Chemical Industry Co., Ltd. Goi Plant (72) Inventor Isamu Hattori 14 Goi South Coast, Ichihara City, Chiba Prefecture Hitachi Chemical Co., Ltd. Goi Plant F-term (reference) 4F074 AA09 AA12 AA17 AA32 AA41 BA36 BA37 BA38 BA39 BA40 BC01 CA23 CA34 CA35 CA38 CA39 CA48 CA49 CA51 CC04X CC05X CC24X CC32X CC32Y CC45 4F201 AA13 AC01 AG20 AH26 AH48 BA02 BC01 BC13 BC17 BC19 BC21 BD05 BL12 BL42 BL48 4F212 AA13 AC01 AG20 AH26 AH48 UA01 UB01 BA30 AD01 BA01 UE30 4BF301 CA09 CA11
Claims (5)
ス）が５〜１５g／１０分の範囲にある発泡性スチレン
系樹脂を、押出機の加熱温度を２２０〜２６０℃として
ペレットにした後、発泡剤を含浸することを特徴とする
再生発泡性スチレン系樹脂粒子の製造法。An extrudable styrenic resin having a resin flowability (melt flow index) in the range of 5 to 15 g / 10 minutes is pelletized at an extruder heating temperature of 220 to 260 ° C. A method for producing regenerated foamable styrenic resin particles, characterized by impregnating.
して、０．４〜０．６とした請求項１記載の再生発泡性
スチレン系樹脂粒子の製造法。2. The method for producing regenerated expandable styrene resin particles according to claim 1, wherein the diameter of the pellets is 0.4 to 0.6 with respect to the die diameter of the extruder.
して、０．７〜１．０とした請求項１または２に記載の
再生発泡性スチレン系樹脂粒子の製造法。3. The method for producing regenerated expandable styrene resin particles according to claim 1, wherein the length of the pellets is 0.7 to 1.0 with respect to the die diameter of the extruder.
造法により得られる再生発泡性スチレン系樹脂粒子。4. Regenerated foamable styrene-based resin particles obtained by the production method according to claim 1.
樹脂粒子を発泡成形して得られる発泡スチレン系樹脂成
形品。5. A foamed styrene-based resin molded product obtained by foam-molding the recycled foamable styrene-based resin particles according to claim 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11774199A JP4261676B2 (en) | 1999-04-26 | 1999-04-26 | Production method of regenerated foaming styrene resin particles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11774199A JP4261676B2 (en) | 1999-04-26 | 1999-04-26 | Production method of regenerated foaming styrene resin particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000309659A true JP2000309659A (en) | 2000-11-07 |
| JP4261676B2 JP4261676B2 (en) | 2009-04-30 |
Family
ID=14719164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11774199A Expired - Fee Related JP4261676B2 (en) | 1999-04-26 | 1999-04-26 | Production method of regenerated foaming styrene resin particles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4261676B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004020167A1 (en) * | 2002-08-28 | 2004-03-11 | Jfe Engineering Corporation | Method for recycling foamed polystyrol resin |
| JP2009235250A (en) * | 2008-03-27 | 2009-10-15 | Kaneka Corp | Method for producing foamable styrenic resin particles |
| JP2009242543A (en) * | 2008-03-31 | 2009-10-22 | Kaneka Corp | Method for producing foamable styrenic resin particle |
| CN101701073B (en) * | 2009-11-05 | 2012-05-30 | 吉林大学 | Method for functionally remolding waste polystyrene |
| JP2012167267A (en) * | 2011-01-26 | 2012-09-06 | Sekisui Plastics Co Ltd | Foamable polystyrene-based resin particle and method for producing the same and foam molded product |
| JP2013227537A (en) * | 2012-03-27 | 2013-11-07 | Sekisui Plastics Co Ltd | Foamable polystyrene-based resin particle, manufacturing method thereof, preliminary foamed particle, and foamed molding |
| WO2024071231A1 (en) * | 2022-09-28 | 2024-04-04 | 積水化成品工業株式会社 | Recycled foamable styrene-based resin particle manufacturing method, recycled foamable styrene-based resin particles, recycled pre-foamed styrene-based resin particles, and recycled styrene-based resin-foamed molded body |
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1999
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004020167A1 (en) * | 2002-08-28 | 2004-03-11 | Jfe Engineering Corporation | Method for recycling foamed polystyrol resin |
| JP2009235250A (en) * | 2008-03-27 | 2009-10-15 | Kaneka Corp | Method for producing foamable styrenic resin particles |
| JP2009242543A (en) * | 2008-03-31 | 2009-10-22 | Kaneka Corp | Method for producing foamable styrenic resin particle |
| CN101701073B (en) * | 2009-11-05 | 2012-05-30 | 吉林大学 | Method for functionally remolding waste polystyrene |
| JP2012167267A (en) * | 2011-01-26 | 2012-09-06 | Sekisui Plastics Co Ltd | Foamable polystyrene-based resin particle and method for producing the same and foam molded product |
| WO2013111368A1 (en) * | 2012-01-26 | 2013-08-01 | 積水化成品工業株式会社 | Expandable polystyrene-type resin particles and method for producing same, and molded foam |
| JP2013227537A (en) * | 2012-03-27 | 2013-11-07 | Sekisui Plastics Co Ltd | Foamable polystyrene-based resin particle, manufacturing method thereof, preliminary foamed particle, and foamed molding |
| WO2024071231A1 (en) * | 2022-09-28 | 2024-04-04 | 積水化成品工業株式会社 | Recycled foamable styrene-based resin particle manufacturing method, recycled foamable styrene-based resin particles, recycled pre-foamed styrene-based resin particles, and recycled styrene-based resin-foamed molded body |
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| Publication number | Publication date |
|---|---|
| JP4261676B2 (en) | 2009-04-30 |
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