JP3452385B2 - Method for producing composite foam - Google Patents
Method for producing composite foamInfo
- Publication number
- JP3452385B2 JP3452385B2 JP28111893A JP28111893A JP3452385B2 JP 3452385 B2 JP3452385 B2 JP 3452385B2 JP 28111893 A JP28111893 A JP 28111893A JP 28111893 A JP28111893 A JP 28111893A JP 3452385 B2 JP3452385 B2 JP 3452385B2
- Authority
- JP
- Japan
- Prior art keywords
- thermoplastic resin
- resin particles
- expandable thermoplastic
- weight
- parts
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、複合発泡体の製造方法
に関する。
【０００２】
【従来の技術】熱可塑性樹脂よりなる発泡体は、自動車
内装、建材等のパネル材、断熱材として広く使用されて
いる。これら発泡体は、良好な衝撃性、耐久性、断熱性
を維持することが必要である。特公昭５４−４６２６９
号公報には、金型と金型内面に配設する表皮層用シート
を工夫して発泡性熱可塑性樹脂粒子を単独で金型内に充
填することにより、強靱にして平滑、緻密な表皮を有す
る発泡性熱可塑性樹脂を製造する技術が開示されてい
る。
【０００３】しかしながら、上記製造方法では、金型内
に配する発泡性熱可塑性樹脂は単独で用いられており、
このため高発泡させた成形品は圧縮により変形し易いと
いう欠点があった。
【０００４】
【発明が解決しようとする課題】本発明は、上記に鑑
み、圧縮強度が向上した複合発泡体を得る製造方法を提
供することを目的とする。
【０００５】
【課題を解決するための手段】本発明の要旨は、発泡性
熱可塑性樹脂粒子と非発泡性熱可塑性樹脂粒子とを混合
した後加熱成形して複合発泡体を製造するところにあ
り、粒子の軟化点温度、メルトフローインデックス及び
各粒子の混合重量比を工夫するところにある。
【０００６】本発明で使用される発泡性熱可塑性樹脂
は、熱可塑性樹脂及び分解型発泡剤によりなる。
【０００７】上記熱可塑性樹脂は特に限定されるもので
はなく、例えば、ポリエチレン、ポリプロピレン等のポ
リオレフィン、ポリスチレン、ポリ塩化ビニル、ＡＢＳ
樹脂等が挙げられる。これらは１種又は２種以上のもの
を混合して使用することができるが、２種以上のものを
混合して使用するときには、発泡性と強度とを勘案して
熱接合性のよいものを選択するのがよい。
【０００８】上記発泡剤としては、特に限定されるもの
ではなく、アゾジカルボンアミド、アゾビスイソブチロ
ニトリル、Ｎ，Ｎ′−ジニトロペンタメチレンテトラミ
ン、ｐ，ｐ′−オキシビスベンゼンスルホニルヒドラジ
ド、ｐ−トルエンスルホニルセミカルバジド、アゾジカ
ルボン酸バリウム、トリヒドラジノトリアジン、５−フ
ェニルテトラゾール等が挙げられる。上記発泡剤の添加
量は、多すぎると破泡して空隙ができることがあり、少
なすぎると得られる複合発泡体の軽量化が図れないこと
となるので、熱可塑性樹脂１００重量部に対して１〜３
０重量部が好ましい。
【０００９】上記発泡性熱可塑性樹脂には、更に必要に
応じて、ジクミルパーオキサイド、２、５−ジメチル
２、５−ジヘキサン、２、５−ジメチル−２、５−ジヘ
キシン−３等の架橋剤、架橋助剤、充填剤、可塑剤、安
定剤等を適宜加えることができる。上記発泡性熱可塑性
樹脂は、分解型発泡剤の分解温度未満の温度で混練し、
ペレット状又は粉体状に成形して発泡性熱可塑性樹脂粒
子とする。上記発泡性熱可塑性樹脂粒子の製造方法は特
に限定されず、例えば、熱可塑性樹脂に発泡剤、発泡助
剤等を添加して、タンブラーやミキサー等によりドライ
ブレンドした後、これらの混合物を押出機で混練し、ペ
レット状又は粉体状に成形して製造する方法等が挙げら
れる。
【００１０】本発明で使用される非発泡性熱可塑性樹脂
は、上記熱可塑性樹脂に必要に応じて、ジクミルパーオ
キサイド、２、５−ジメチル２、５−ジヘキサン、２、
５−ジメチル−２、５−ジヘキシン−３等の架橋剤、架
橋助剤、充填剤、可塑剤、安定剤等を適宜加えることが
できる。上記非発泡性熱可塑性樹脂は、適宜混練しペレ
ット状又は粉体状に成形して非発泡性熱可塑性樹脂粒子
とする。
【００１１】発泡性熱可塑性樹脂粒子及び非発泡性熱可
塑性樹脂粒子に使用される上記熱可塑性樹脂は同種のも
のでも異種のものでもよいが、熱接合性の悪いもの同士
を用いる場合は、圧縮強度に影響はないが、曲げ強度は
若干低下することがあるので熱接合性のよいものを選択
するのがよい。
【００１２】本発明においては、上記発泡性熱可塑性樹
脂粒子と上記非発泡性熱可塑性樹脂粒子とを予めタンブ
ラーやミキサーによりドライブレンドし、金型内に導入
して加熱発泡させる。
【００１３】上記において、非発泡性熱可塑性樹脂の軟
化点温度が発泡性熱可塑性樹脂粒子を構成する分解型発
泡剤の分解温度より高いと、発泡性熱可塑性樹脂粒子の
周囲を非発泡性熱可塑性樹脂粒子が取り囲むことができ
ず、非発泡性熱可塑性樹脂粒子による三次元網目構造が
形成できないので、非発泡性熱可塑性樹脂の軟化点温度
は発泡性熱可塑性樹脂を構成する分解型発泡剤の分解温
度より低くする必要がある。
【００１４】上記において、上記発泡性熱可塑性樹脂粒
子に比較して上記非発泡性熱可塑性樹脂粒子の流動性が
著しく悪いと、上記発泡性熱可塑性樹脂粒子の発泡膨張
を妨げるので、金型内の発泡成形温度において発泡性熱
可塑性樹脂を構成する熱可塑性樹脂のメルトフローイン
デックスが、非発泡性熱可塑性樹脂のメルトフローイン
デックスより低くなる必要がある。
【００１５】本発明の複合発泡体においては、発泡性熱
可塑性樹脂粒子に対する非発泡性熱可塑性樹脂粒子の混
合比は、小さすぎると軽量効果が期待できず、大きすぎ
ると非発泡性熱可塑性樹脂による三次元網目構造による
強度の向上が期待できないので、発泡性熱可塑性樹脂粒
子１００重量部に対して非発泡性熱可塑性樹脂粒子を３
〜１５００重量部混合する。
【００１６】本発明においては、金型内で発泡性熱可塑
性樹脂粒子と非発泡性熱可塑性樹脂粒子の混合組成物を
加熱し未発泡部分のないように充分発泡させる。金型に
圧力を加えると、異形の形状や表面に平滑性を有する複
合発泡体が得られ好適である。その後、金型を冷却して
成形後の複合発泡体のなえを防ぐとよい。
【００１７】非発泡性熱可塑性樹脂粒子に、炭素繊維又
はガラス繊維を補強繊維として混入すると、本発明の複
合発泡体は耐衝撃性に優れたものとなり好適である。上
記補強繊維は、少なすぎると補強効果がなく、多すぎる
と樹脂の流動性が悪くなり三次元網目構造が形成されな
いので、樹脂１００重量部に対して、５〜１２０重量部
加えるのがよい。好ましくは、１０〜１００重量部であ
り、より好ましくは、２０〜９０重量部である。
【００１８】上記補強繊維のモノフィラメントの直径
は、細すぎると補強効果を発揮することができず、太す
ぎると非発泡性熱可塑性樹脂粒子の流動性が失われるの
で、１〜５０μｍが好ましい。上記補強繊維の繊維長
は、短すぎると補強効果を発揮することができず、長す
ぎると非発泡性熱可塑性樹脂粒子の流動性が失われるの
で、１〜１０ｍｍが好ましく、より好ましくは２〜７ｍ
ｍである。
【００１９】
【実施例】以下に本発明の実施例を掲げて本発明を更に
詳しく説明するが、本発明はこれら実施例に限定される
ものではない。
実施例１
発泡性熱可塑性樹脂粒子：高密度ポリエチレン（旭化成
工業社製、商品名Ｂ１６１。メルトフローインデックス
＝１．２）１００重量部、アゾジカルボンアミド５重量
部、ジクミルパーオキサイド０．８重量部を、押出機に
より１７０℃で混練し、直径３ｍｍ、長さ５ｍｍの俵型
ペレット（２１０℃でのメルトフローインデックス＝
０．８）を得た。非発泡性熱可塑性樹脂粒子：高密度ポ
リエチレン（三菱油化社製、商品名ＪＹ２０。メルトフ
ローインデックス＝９、ビカット軟化点温度１２８℃、
平均粒径３ｍｍ）１００重量部を押出機により１７０℃
で混練し、直径２ｍｍ、長さ３ｍｍの俵型ペレット（２
１０℃でのメルトフローインデックス＝５）を得た。発
泡性熱可塑性樹脂粒子と非発泡性熱可塑性樹脂粒子を重
量比１：２でドライブレンドし、２１０℃に加熱された
金型内に配した。
【００２０】次に、金型を締切り、５０ｋｇ／ｃｍ2 の
加圧下で８分間、加熱加圧保持し、しかる後に金型内に
冷却水を流し、７０℃まで冷却後、金型より取り出し
た。得られた発泡体は、厚み３０ｍｍ、比重０．２３で
あり、非発泡性熱可塑性樹脂が三次元網目構造を有する
複合発泡体であった。
【００２１】実施例２
発泡性熱可塑性樹脂粒子：高密度ポリエチレン（旭化成
工業社製、商品名Ｂ１６１。メルトフローインデックス
＝１．２）１００重量部、アゾジカルボンアミド７重量
部、ジクミルパーオキサイド０．８重量部を、押出機に
より１７０℃で混練し、直径３ｍｍ、長さ５ｍｍの俵型
ペレット（２１０℃でのメルトフローインデックス＝
０．８）を得た。非発泡性熱可塑性樹脂粒子：高密度ポ
リエチレン（三菱油化社製、商品名ＪＹ２０。メルトフ
ローインデックス＝９、ビカット軟化点温度１２８℃、
平均粒径３ｍｍ）１００重量部、ガラス繊維（日東紡績
社製、商品名ＣＳ ３ＰＥ９４６。素線径１３μｍ、長
さ３ｍｍ）２０重量部を押出機により１７０℃で混練
し、直径２ｍｍ、長さ３ｍｍの俵型ペレット（２１０℃
でのメルトフローインデックス＝５）を得た。発泡性熱
可塑性樹脂粒子と非発泡性熱可塑性樹脂粒子を重量比
１：２でドライブレンドし、２１０℃に加熱された金型
内に配した。
【００２２】次に、金型を締切り、５０ｋｇ／ｃｍ2 の
加圧下で８分間、加熱加圧保持し、しかる後に金型内に
冷却水を流し７０℃まで冷却後、金型より取り出した。
得られた発泡体は、厚み３０ｍｍ、比重０．２３であ
り、非発泡性熱可塑性樹脂が三次元網目構造を有する複
合発泡体であった。
【００２３】比較例１
発泡性熱可塑性樹脂粒子：高密度ポリエチレン（旭化成
工業社製、商品名Ｂ１６１。メルトフローインデックス
＝＝１．２）１００重量部、発泡剤（アゾジカルボンア
ミド。分解温度２０８℃）７重量部、ジクミルパーオキ
サイド０．８重量部を、押出機により１７０℃で混練
し、直径３ｍｍ、長さ５ｍｍの俵型ペレット（２１０℃
でのメルトフローインデックス＝０．８）を得た。上記
発泡性熱可塑性樹脂粒子を２１０℃に加熱された金型内
に配した。
【００２４】次に、金型を締切、５０ｋｇ／ｃｍ2 の加
圧下で８分間、加熱加圧保持し、しかる後に金型内に冷
却水を流し７０℃まで冷却後、金型より取り出した。得
られた発泡体は、厚み３０ｍｍ、比重０．２３であっ
た。
【００２５】実施例及び比較例で得られた発泡体を、Ｊ
ＩＳＫ７２２０−１９８３に準拠して圧縮強度（圧縮比
例限応力）を測定し、結果を表１に示した。
【００２６】
【表１】
【００２７】
【発明の効果】本発明によれば、非発泡性熱可塑性樹脂
の三次元網目構造を有し、圧縮強度の向上した複合発泡
体が得られる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite foam. [0002] A foam made of a thermoplastic resin is widely used as a panel material for automobile interiors and building materials, and as a heat insulating material. These foams need to maintain good impact resistance, durability, and heat insulation. JP-B-54-46269
In the publication, the mold and the sheet for the skin layer to be arranged on the inner surface of the mold are devised, and the expandable thermoplastic resin particles are filled into the mold alone to obtain a tough, smooth, and dense skin. A technique for producing a foamable thermoplastic resin having the same is disclosed. [0003] However, in the above manufacturing method, the expandable thermoplastic resin disposed in the mold is used alone.
For this reason, the molded article which has been highly foamed has a drawback that it is easily deformed by compression. [0004] In view of the above, an object of the present invention is to provide a method for producing a composite foam having improved compressive strength. SUMMARY OF THE INVENTION The gist of the present invention is to produce a composite foam by mixing expandable thermoplastic resin particles and non-expandable thermoplastic resin particles, followed by heat molding. , The softening point temperature of the particles, the melt flow index and the mixing weight ratio of each particle. [0006] The foamable thermoplastic resin used in the present invention comprises a thermoplastic resin and a decomposable foaming agent. The thermoplastic resin is not particularly restricted but includes, for example, polyolefins such as polyethylene and polypropylene, polystyrene, polyvinyl chloride and ABS.
Resins. These can be used alone or in combination of two or more, but when used in combination of two or more, those having good thermal bonding properties in consideration of foamability and strength. Good to choose. The foaming agent is not particularly restricted but includes azodicarbonamide, azobisisobutyronitrile, N, N'-dinitropentamethylenetetramine, p, p'-oxybisbenzenesulfonylhydrazide, p -Toluenesulfonyl semicarbazide, barium azodicarboxylate, trihydrazinotriazine, 5-phenyltetrazole and the like. If the amount of the foaming agent is too large, the foam may be broken and voids may be formed. If the amount is too small, the weight of the obtained composite foam may not be reduced. ~ 3
0 parts by weight is preferred. The foamable thermoplastic resin may be further cross-linked, if necessary, with dicumyl peroxide, 2,5-dimethyl 2,5-dihexane, 2,5-dimethyl-2, 5-dihexine-3, or the like. Agents, crosslinking assistants, fillers, plasticizers, stabilizers and the like can be added as appropriate. The foamable thermoplastic resin is kneaded at a temperature lower than the decomposition temperature of the decomposition type foaming agent,
It is formed into a pellet or powder to obtain expandable thermoplastic resin particles. The method for producing the expandable thermoplastic resin particles is not particularly limited. For example, a foaming agent, a foaming aid, and the like are added to the thermoplastic resin, and the mixture is dry-blended using a tumbler or a mixer. And then molding into pellets or powders to produce. The non-foamable thermoplastic resin used in the present invention may be dicumyl peroxide, 2,5-dimethyl 2,5-dihexane, 2,
A crosslinking agent such as 5-dimethyl-2, 5-dihexine-3, a crosslinking aid, a filler, a plasticizer, a stabilizer, and the like can be appropriately added. The non-foamable thermoplastic resin is appropriately kneaded and formed into a pellet or powder to obtain non-foamable thermoplastic resin particles. The thermoplastic resins used for the expandable thermoplastic resin particles and the non-expandable thermoplastic resin particles may be of the same type or different types. Although there is no influence on the strength, the bending strength may be slightly reduced, so that a material having good thermal bonding properties is preferably selected. In the present invention, the expandable thermoplastic resin particles and the non-expandable thermoplastic resin particles are dry-blended by a tumbler or a mixer in advance, introduced into a mold, and heated and foamed. In the above, when the softening point temperature of the non-foamable thermoplastic resin is higher than the decomposition temperature of the decomposable foaming agent constituting the foamable thermoplastic resin particles, the surroundings of the foamable thermoplastic resin particles are heated. Since the three-dimensional network structure cannot be formed by the non-expandable thermoplastic resin particles because the non-expandable thermoplastic resin particles cannot surround the non-expandable thermoplastic resin, the softening point temperature of the non-expandable thermoplastic resin is determined by the decomposition type foaming agent constituting the expandable thermoplastic resin. Must be lower than the decomposition temperature. In the above, if the fluidity of the non-expandable thermoplastic resin particles is extremely poor as compared with the expandable thermoplastic resin particles, the expansion and expansion of the expandable thermoplastic resin particles is hindered. It is necessary that the melt flow index of the thermoplastic resin constituting the expandable thermoplastic resin is lower than the melt flow index of the non-expandable thermoplastic resin at the expansion molding temperature. In the composite foam of the present invention, if the mixing ratio of the non-expandable thermoplastic resin particles to the expandable thermoplastic resin particles is too small, a lightweight effect cannot be expected. No improvement in strength due to the three-dimensional network structure can be expected, so that 3 parts of non-expandable thermoplastic resin particles are added to 100 parts by weight of expandable thermoplastic resin particles.
〜1500 parts by weight. In the present invention, the mixed composition of the expandable thermoplastic resin particles and the non-expandable thermoplastic resin particles is heated in a mold and sufficiently expanded so that there is no unfoamed portion. When pressure is applied to the mold, a composite foam having an irregular shape and a smooth surface is obtained, which is preferable. Thereafter, the mold may be cooled to prevent the composite foam after molding from being damaged. When carbon fibers or glass fibers are mixed as reinforcing fibers into non-expandable thermoplastic resin particles, the composite foam of the present invention is excellent in impact resistance and is suitable. If the amount of the reinforcing fibers is too small, the reinforcing effect is not obtained, and if the amount is too large, the fluidity of the resin deteriorates and a three-dimensional network structure is not formed. Therefore, it is preferable to add 5 to 120 parts by weight to 100 parts by weight of the resin. Preferably, it is 10 to 100 parts by weight, more preferably 20 to 90 parts by weight. If the diameter of the monofilament of the reinforcing fiber is too small, the reinforcing effect cannot be exerted, and if it is too large, the fluidity of the non-expandable thermoplastic resin particles is lost. If the fiber length of the reinforcing fiber is too short, the reinforcing effect cannot be exhibited, and if it is too long, the fluidity of the non-foamable thermoplastic resin particles is lost, so that the length is preferably 1 to 10 mm, more preferably 2 to 10 mm. 7m
m. The present invention will be described in more detail with reference to examples of the present invention, but the present invention is not limited to these examples. Example 1 Expandable thermoplastic resin particles: 100 parts by weight of high-density polyethylene (manufactured by Asahi Kasei Corporation, trade name: B161; melt flow index = 1.2), 5 parts by weight of azodicarbonamide, 0.8 parts by weight of dicumyl peroxide Part was kneaded with an extruder at 170 ° C., and a bale-shaped pellet having a diameter of 3 mm and a length of 5 mm (melt flow index at 210 ° C. =
0.8). Non-expandable thermoplastic resin particles: high-density polyethylene (manufactured by Mitsubishi Yuka Co., Ltd., trade name: JY20. Melt flow index = 9, Vicat softening point temperature 128 ° C.,
100 parts by weight of an average particle size of 3 mm) is 170 ° C. by an extruder.
, And a bale-shaped pellet (2 mm in diameter and 3 mm in length)
A melt flow index at 10 ° C. = 5) was obtained. The expandable thermoplastic resin particles and the non-expandable thermoplastic resin particles were dry-blended at a weight ratio of 1: 2, and placed in a mold heated to 210 ° C. Next, the mold was shut off, heated and pressed under a pressure of 50 kg / cm 2 for 8 minutes, and then cooled water was poured into the mold. After cooling to 70 ° C., the mold was taken out of the mold. . The obtained foam was a composite foam having a thickness of 30 mm, a specific gravity of 0.23, and a non-foamable thermoplastic resin having a three-dimensional network structure. Example 2 Expandable thermoplastic resin particles: 100 parts by weight of high-density polyethylene (manufactured by Asahi Kasei Corporation, trade name B161; melt flow index = 1.2), 7 parts by weight of azodicarbonamide, and 0 parts of dicumyl peroxide 0.8 parts by weight were kneaded with an extruder at 170 ° C., and a bale-shaped pellet having a diameter of 3 mm and a length of 5 mm (melt flow index at 210 ° C. =
0.8). Non-expandable thermoplastic resin particles: high-density polyethylene (manufactured by Mitsubishi Yuka Co., Ltd., trade name: JY20. Melt flow index = 9, Vicat softening point temperature 128 ° C.,
100 parts by weight of an average particle size of 3 mm) and 20 parts by weight of glass fiber (trade name: CS 3PE946, manufactured by Nitto Boseki Co., Ltd .; wire diameter: 13 μm, length: 3 mm) are kneaded at 170 ° C. by an extruder to obtain a diameter of 2 mm and a length of 3 mm. Bales of pellets (210 ° C
Melt flow index = 5). The expandable thermoplastic resin particles and the non-expandable thermoplastic resin particles were dry-blended at a weight ratio of 1: 2, and placed in a mold heated to 210 ° C. Next, the mold was closed, heated and pressed under a pressure of 50 kg / cm 2 for 8 minutes, and then cooled water was poured into the mold, cooled to 70 ° C., and then taken out of the mold.
The obtained foam was a composite foam having a thickness of 30 mm, a specific gravity of 0.23, and a non-foamable thermoplastic resin having a three-dimensional network structure. Comparative Example 1 Expandable thermoplastic resin particles: 100 parts by weight of high-density polyethylene (manufactured by Asahi Kasei Corporation, trade name: B161; melt flow index == 1.2), blowing agent (azodicarbonamide, decomposition temperature: 208 ° C.) ) 7 parts by weight and 0.8 parts by weight of dicumyl peroxide were kneaded by an extruder at 170 ° C, and a bale-shaped pellet having a diameter of 3 mm and a length of 5 mm (210 ° C)
Melt flow index = 0.8). The expandable thermoplastic resin particles were placed in a mold heated to 210 ° C. Next, the mold was closed, heated and pressed under a pressure of 50 kg / cm 2 for 8 minutes, and then cooled water was poured into the mold and cooled to 70 ° C., and then taken out of the mold. The obtained foam had a thickness of 30 mm and a specific gravity of 0.23. The foams obtained in Examples and Comparative Examples were
The compressive strength (compression proportional limit stress) was measured according to ISK7220-1983, and the results are shown in Table 1. [Table 1] According to the present invention, a composite foam having a three-dimensional network structure of a non-foamable thermoplastic resin and having improved compressive strength can be obtained.
フロントページの続き (56)参考文献 特開 昭50−10868（ＪＰ，Ａ) 特開 昭49−23863（ＪＰ，Ａ) 特開 昭48−28569（ＪＰ，Ａ) 特開 平６−246745（ＪＰ，Ａ) 実開 昭49−36157（ＪＰ，Ｕ) 特公 昭47−19873（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 44/00 - 44/60,67/20 C08J 9/22 - 9/236 Continuation of the front page (56) References JP-A-50-10868 (JP, A) JP-A-49-23863 (JP, A) JP-A-48-28569 (JP, A) JP-A-6-246745 (JP) , A) Japanese Utility Model Showa 49-36157 (JP, U) JP-B 47-19873 (JP, B1) (58) Fields investigated (Int. Cl. 7 , DB name) B29C 44/00-44/60, 67/20 C08J 9/22-9/236
Claims (1)
発泡性熱可塑性樹脂粒子と非発泡性熱可塑性樹脂粒子と
を混合した後加熱成形してなる複合発泡体の製造方法に
おいて、非発泡性熱可塑性樹脂の軟化点温度が発泡性熱
可塑性樹脂粒子を構成する分解型発泡剤の分解温度より
低く、加熱成形時の温度において非発泡性熱可塑性樹脂
のメルトフローインデックスが発泡性熱可塑性樹脂粒子
を構成する熱可塑性樹脂のメルトフローインデックスよ
り大きく、発泡性熱可塑性樹脂粒子１００重量部に対し
て非発泡性熱可塑性樹脂粒子を３〜１５００重量部混合
することを特徴とする複合発泡体の製造方法。(57) [Claims 1] Composite foaming obtained by mixing expandable thermoplastic resin particles composed of a thermoplastic resin and a decomposable foaming agent and non-expandable thermoplastic resin particles, followed by heat molding. In the method for producing a body, the softening point of the non-foamable thermoplastic resin is lower than the decomposition temperature of the decomposable foaming agent constituting the foamable thermoplastic resin particles, and the melt of the non-foamable thermoplastic resin is heated at the temperature during heat molding. The flow index is larger than the melt flow index of the thermoplastic resin constituting the expandable thermoplastic resin particles, and 3 to 1500 parts by weight of the non-expandable thermoplastic resin particles are mixed with 100 parts by weight of the expandable thermoplastic resin particles. A method for producing a composite foam, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28111893A JP3452385B2 (en) | 1993-11-10 | 1993-11-10 | Method for producing composite foam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28111893A JP3452385B2 (en) | 1993-11-10 | 1993-11-10 | Method for producing composite foam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07132525A JPH07132525A (en) | 1995-05-23 |
| JP3452385B2 true JP3452385B2 (en) | 2003-09-29 |
Family
ID=17634613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28111893A Expired - Fee Related JP3452385B2 (en) | 1993-11-10 | 1993-11-10 | Method for producing composite foam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3452385B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012233132A (en) * | 2011-05-09 | 2012-11-29 | Nitto Denko Corp | Thermally expandable resin composition, thermally expandable resin sheet, foam and method for producing the same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS549223B2 (en) * | 1971-08-18 | 1979-04-23 | ||
| JPS5436620B2 (en) * | 1972-06-29 | 1979-11-10 | ||
| JPS5556017Y2 (en) * | 1972-07-04 | 1980-12-25 | ||
| JPS5010868A (en) * | 1973-06-04 | 1975-02-04 | ||
| JPH06246745A (en) * | 1993-02-23 | 1994-09-06 | Sekisui Plastics Co Ltd | Mixer for resin particles and manufacture of mixed resin molded form |
-
1993
- 1993-11-10 JP JP28111893A patent/JP3452385B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07132525A (en) | 1995-05-23 |
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