JP2014198380A - Method for manufacturing foam molding and foam molding - Google Patents

Method for manufacturing foam molding and foam molding Download PDF

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JP2014198380A
JP2014198380A JP2013073790A JP2013073790A JP2014198380A JP 2014198380 A JP2014198380 A JP 2014198380A JP 2013073790 A JP2013073790 A JP 2013073790A JP 2013073790 A JP2013073790 A JP 2013073790A JP 2014198380 A JP2014198380 A JP 2014198380A
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particles
thermoplastic polyester
polyester resin
foamed
adhesive resin
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JP6096564B2 (en
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洋一郎 福永
Yoichiro Fukunaga
洋一郎 福永
慶尚 山地
Yoshihisa Yamaji
慶尚 山地
一迅 人見
Kazutoki Hitomi
一迅 人見
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Sekisui Kasei Co Ltd
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Sekisui Plastics Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a foam molding excellent in terms of mechanical strengths (e.g., specific load, etc.), impact absorption capacity, and heat resistance.SOLUTION: In the method of the present invention for manufacturing a foam molding, 0.1-5 parts.wt. of adhesive resin particles having an average particle diameter commensurate with 1-15% of the average particle diameter of a separately prepared thermoplastic polyester resin foam particles are adhered to surfaces of the thermoplastic polyester resin foam particles with respect to 100 parts.wt. of the thermoplastic polyester resin foam particles, and after the resulting thermoplastic polyester resin foam particles have been filled into a mold, heated, and foamed, individual members of the thermoplastic polyester resin foam particles obtained by foaming the thermoplastic polyester resin foam particles are fused and integrated.

Description

本発明は、発泡成形体の製造方法及び発泡成形体に関する。   The present invention relates to a method for producing a foam molded article and a foam molded article.

省エネルギーの観点から、近年、自動車、航空機、鉄道車両などの分野においては、軽量性に劣る金属材料の代わりに、発泡成形体を一部に使用する動きが強くなっており、熱可塑性樹脂を発泡させて得られる、軽量で且つ比荷重などの機械的強度、衝撃吸収性及び耐熱性に優れた発泡成形体を製造することが企図されている。   From the viewpoint of energy saving, in recent years, in the fields of automobiles, airplanes, railway vehicles, etc., instead of metal materials that are inferior in weight, there is a strong movement to use foamed molded products in part, and foaming thermoplastic resin It is intended to produce a foamed molded article that is lightweight and has excellent mechanical strength such as specific load, shock absorption, and heat resistance.

特許文献1には、ポリスチレン樹脂もしくはポリオレフィン樹脂からなる多数の発泡粒子がエポキシ樹脂系硬化物で接合されてなる複合発泡成形体が開示されている。   Patent Document 1 discloses a composite foamed molded article in which a large number of foamed particles made of polystyrene resin or polyolefin resin are bonded with an epoxy resin-based cured product.

しかしながら、ポリスチレン樹脂及びポリオレフィン樹脂から形成された発泡成形体は、機械的強度及び耐熱性が低く、発泡成形体に荷重が加わった時に座屈してしまうなどの問題点を有している。   However, foam molded articles formed from polystyrene resin and polyolefin resin have low mechanical strength and heat resistance, and have problems such as buckling when a load is applied to the foam molded article.

特開2001−62860号公報JP 2001-62860 A

本発明は、比荷重(1g当たりの最大荷重)などの機械的強度、衝撃吸収性及び耐熱性に優れた発泡成形体の製造方法及びこの製造方法を用いて製造された発泡成形体を提供する。   The present invention provides a method for producing a foamed molded article excellent in mechanical strength such as specific load (maximum load per 1 g), shock absorption and heat resistance, and a foamed molded article produced using this production method. .

本発明の発泡成形体の製造方法は、熱可塑性ポリエステル系樹脂発泡粒子の表面に、この熱可塑性ポリエステル系樹脂発泡粒子の平均粒径に対して1〜15%の平均粒径を有する接着性樹脂粒子を上記熱可塑性ポリエステル系樹脂発泡粒子100重量部に対して0.1〜5重量部付着させた後、上記熱可塑性ポリエステル系樹脂発泡粒子を金型に充填して加熱して発泡させ、上記熱可塑性ポリエステル系樹脂発泡粒子を発泡させて得られる熱可塑性ポリエステル系樹脂発泡粒子同士を熱融着一体化させることを特徴とする。   The method for producing a foamed molded article of the present invention comprises an adhesive resin having an average particle diameter of 1 to 15% with respect to the average particle diameter of the thermoplastic polyester resin foam particles on the surface of the thermoplastic polyester resin foam particles. After 0.1 to 5 parts by weight of the particles are attached to 100 parts by weight of the thermoplastic polyester resin foam particles, the thermoplastic polyester resin foam particles are filled in a mold and heated to foam, The thermoplastic polyester resin foamed particles obtained by foaming thermoplastic polyester resin foamed particles are heat-bonded and integrated with each other.

上記熱可塑性ポリエステル系樹脂発泡粒子を構成している熱可塑性ポリエステル系樹脂は、比荷重などの機械的強度が高くて形状安定性に優れていると共に耐熱性にも優れており、ポリエチレン系樹脂やポリプロピレン系樹脂などのポリオレフィン系樹脂やスチレン系樹脂には見られない優れた性質を有している。   The thermoplastic polyester resin constituting the thermoplastic polyester resin expanded particles has high mechanical strength such as specific load, excellent shape stability and heat resistance. It has excellent properties not found in polyolefin resins such as polypropylene resins and styrene resins.

熱可塑性ポリエステル系樹脂は、ジカルボン酸と二価アルコールとが、縮合反応を行った結果得られた高分子量の線状ポリエステルである。熱可塑性ポリエステル系樹脂としては、例えば、芳香族ポリエステル樹脂、脂肪族ポリエステル樹脂などが挙げられる。   The thermoplastic polyester resin is a high molecular weight linear polyester obtained as a result of a condensation reaction between a dicarboxylic acid and a dihydric alcohol. Examples of the thermoplastic polyester resin include aromatic polyester resins and aliphatic polyester resins.

芳香族ポリエステル樹脂とは、芳香族ジカルボン酸成分とジオール成分とを含むポリエステルであり、例えば、ポリエチレンテレフタレート、ポリプロピレンテレフタレート、ポリブチレンテレフタレート、ポリシクロヘキサンジメチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンナフタレートなどが挙げられ、ポリエチレンテレフタレートが好ましい。なお、芳香族ポリエステル樹脂は、単独で用いられても二種以上が併用されてもよい。   The aromatic polyester resin is a polyester containing an aromatic dicarboxylic acid component and a diol component, such as polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polycyclohexanedimethylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, etc. And polyethylene terephthalate is preferred. In addition, an aromatic polyester resin may be used independently or 2 or more types may be used together.

なお、芳香族ポリエステル樹脂は、芳香族ジカルボン酸成分及びジオール成分以外に、例えば、トリメリット酸などのトリカルボン酸、ピロメリット酸などのテトラカルボン酸などの三価以上の多価カルボン酸やその無水物、グリセリンなどのトリオール、ペンタエリスリトールなどのテトラオールなどの三価以上の多価アルコールなどを構成成分として含有していてもよい。   In addition to the aromatic dicarboxylic acid component and the diol component, the aromatic polyester resin includes, for example, a tricarboxylic acid such as trimellitic acid such as trimellitic acid, a tetracarboxylic acid such as pyromellitic acid, or a polyvalent carboxylic acid such as tricarboxylic acid or its anhydride. Products, triols such as glycerin, and trihydric or higher polyhydric alcohols such as tetraols such as pentaerythritol may be contained as constituent components.

又、芳香族ポリエステル樹脂は、使用済のペットボトルなどから回収、再生したリサイクル材料を用いることもできる。   As the aromatic polyester resin, a recycled material recovered and recycled from a used PET bottle or the like can be used.

ポリエチレンテレフタレートは架橋剤によって架橋されていてもよい。架橋剤としては、公知のものが用いられ、例えば、無水ピロメリット酸などの酸二無水物、多官能エポキシ化合物、オキサゾリン化合物、オキサジン化合物などが挙げられる。なお、架橋剤は、単独で用いられても二種以上が併用されてもよい。   Polyethylene terephthalate may be crosslinked by a crosslinking agent. Known crosslinking agents are used, and examples thereof include acid dianhydrides such as pyromellitic anhydride, polyfunctional epoxy compounds, oxazoline compounds, and oxazine compounds. In addition, a crosslinking agent may be used independently or 2 or more types may be used together.

ポリエチレンテレフタレートを架橋剤によって架橋する場合には、押出機にポリエチレンテレフタレートと共に架橋剤を供給すればよい。押出機に供給する架橋剤の量は、少なすぎると、ポリエチレンテレフタレートの溶融時の溶融粘度が小さくなりすぎて、破泡してしまうことがあり、多すぎると、ポリエチレンテレフタレートの溶融時の溶融粘度が大きくなりすぎて、発泡体を押出発泡によって製造する場合には押出発泡が困難となることがあるので、ポリエチレンテレフタレート100重量部に対して0.01〜5重量部が好ましく、0.1〜1重量部がより好ましい。   When polyethylene terephthalate is crosslinked with a crosslinking agent, the crosslinking agent may be supplied to the extruder together with the polyethylene terephthalate. If the amount of the cross-linking agent supplied to the extruder is too small, the melt viscosity at the time of melting of the polyethylene terephthalate may become too small, and bubbles may be broken, and if it is too much, the melt viscosity at the time of melting of the polyethylene terephthalate. When the foam is produced by extrusion foaming, extrusion foaming may be difficult, so 0.01 to 5 parts by weight with respect to 100 parts by weight of polyethylene terephthalate is preferable. 1 part by weight is more preferred.

脂肪族ポリエステル樹脂としては、例えば、ポリ乳酸系樹脂などが挙げられる。ポリ乳酸系樹脂としては、乳酸がエステル結合により重合した樹脂を用いることができ、商業的な入手容易性及びポリ乳酸系樹脂粒子への発泡性付与の観点から、D−乳酸(D体)及びL−乳酸(L体)の共重合体、D−乳酸又はL−乳酸のいずれか一方の単独重合体、D−ラクチド、L−ラクチド及びDL−ラクチドからなる群から選択される1又は2以上のラクチドの開環重合体が好ましい。なお、ポリ乳酸系樹脂は、単独で用いられても二種以上が併用されてもよい。   Examples of the aliphatic polyester resin include a polylactic acid resin. As the polylactic acid-based resin, a resin in which lactic acid is polymerized by an ester bond can be used. From the viewpoint of commercial availability and imparting foamability to the polylactic acid-based resin particles, D-lactic acid (D-form) and One or more selected from the group consisting of a copolymer of L-lactic acid (L-form), a homopolymer of either D-lactic acid or L-lactic acid, D-lactide, L-lactide and DL-lactide A ring-opening polymer of lactide is preferred. In addition, polylactic acid-type resin may be used independently, or 2 or more types may be used together.

ポリ乳酸系樹脂は、成形工程及び得られる繊維強化複合体の物性に影響を与えない限り、乳酸以外の単量体成分として、例えば、グリコール酸、ヒドロキシ酪酸、ヒドロキシ吉酸、ヒドロキシカプロン酸、ヒドロキシヘプタン酸などの脂肪族ヒドロキシカルボン酸;コハク酸、アジピン酸、スベリン酸、セバシン酸、ドデカンジカルボン酸、無水コハク酸、無水アジピン酸、トリメシン酸、プロパントリカルボン酸、ピロメリット酸、無水ピロメリット酸などの脂肪族多価カルボン酸;エチレングリコール、1,4−ブタンジオール、1,6−ヘキサンジオール、1,4−シクロヘキサンジメタノール、ネオペンチルグリコール、デカメチレングリコール、グリセリン、トリメチロールプロパン、ペンタエリトリットなどの脂肪族多価アルコールなどを含有していてもよい。   As long as the polylactic acid resin does not affect the molding process and the physical properties of the resulting fiber-reinforced composite, as a monomer component other than lactic acid, for example, glycolic acid, hydroxybutyric acid, hydroxyvaleric acid, hydroxycaproic acid, hydroxy Aliphatic hydroxycarboxylic acids such as heptanoic acid; succinic acid, adipic acid, suberic acid, sebacic acid, dodecanedicarboxylic acid, succinic anhydride, adipic anhydride, trimesic acid, propanetricarboxylic acid, pyromellitic acid, pyromellitic anhydride, etc. Aliphatic polycarboxylic acid of ethylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, neopentyl glycol, decamethylene glycol, glycerin, trimethylolpropane, pentaerythritol Aliphatic polyvalent arco such as Or the like may also contain Lumpur.

ポリ乳酸系樹脂は、成形工程及び得られる繊維強化複合体の物性に影響を与えない限り、アルキル基、ビニル基、カルボニル基、芳香族基、エステル基、エーテル基、アルデヒド基、アミノ基、ニトリル基、ニトロ基などのその他の官能基を含んでいてもよい。ポリ乳酸系樹脂はイソシアネート系架橋剤などによって架橋されていてもよく、エステル結合以外の結合手により結合していてもよい。   As long as the polylactic acid resin does not affect the physical properties of the molding process and the resulting fiber reinforced composite, alkyl group, vinyl group, carbonyl group, aromatic group, ester group, ether group, aldehyde group, amino group, nitrile It may contain other functional groups such as a group and a nitro group. The polylactic acid-based resin may be crosslinked by an isocyanate-based crosslinking agent or the like, or may be bonded by a bond other than an ester bond.

熱可塑性ポリエステル系樹脂発泡粒子の製造方法としては、(1)熱可塑性ポリエステル系樹脂を押出機内に供給して物理発泡剤の存在下にて溶融混練して押出機に取り付けたノズル金型から熱可塑性ポリエステル系樹脂押出物を押出発泡させながら切断した後に冷却して熱可塑性ポリエステル系樹脂発泡粒子を製造する方法、(2)熱可塑性ポリエステル系樹脂を押出機内に供給して物理発泡剤の存在下にて溶融混練して押出機に取り付けたノズル金型から押出発泡してストランド状の熱可塑性ポリエステル系樹脂押出物を製造し、この熱可塑性ポリエステル系樹脂押出物を所定間隔毎に切断して熱可塑性ポリエステル系樹脂発泡粒子を製造する方法、(3)熱可塑性ポリエステル系樹脂を押出機内に供給して物理発泡剤の存在下にて溶融混練して押出機に取り付けた環状ダイ又はTダイから押出発泡して発泡シートを製造し、この発泡シートを切断することによって熱可塑性ポリエステル系樹脂発泡粒子を製造する方法、(4)熱可塑性ポリエステル系樹脂を押出機内に供給して物理発泡剤の存在下にて溶融混練して押出機に取り付けたノズル金型から熱可塑性ポリエステル系樹脂押出物を押出し、切断しながら冷却して発泡性熱可塑性ポリエステル系樹脂粒子を製造する方法などが挙げられる。   The thermoplastic polyester resin foam particles can be produced by (1) supplying a thermoplastic polyester resin into an extruder, melting and kneading it in the presence of a physical foaming agent, and heating from a nozzle die attached to the extruder. A method of producing a thermoplastic polyester resin foamed particle by cooling it after cutting while extruding a plastic polyester resin, (2) In the presence of a physical foaming agent by supplying the thermoplastic polyester resin into the extruder To produce a strand-shaped thermoplastic polyester resin extrudate by extruding and foaming from a nozzle die attached to an extruder, and cutting the thermoplastic polyester resin extrudate at predetermined intervals. Method for producing foamed particles of plastic polyester resin, (3) Supplying thermoplastic polyester resin into an extruder and melting in the presence of a physical foaming agent A method of producing foamed sheet by extrusion foaming from an annular die or a T-die which is kneaded and attached to an extruder, and producing foamed thermoplastic polyester resin particles by cutting the foamed sheet; (4) thermoplastic polyester -Based resin is supplied into an extruder, melt-kneaded in the presence of a physical foaming agent, and a thermoplastic polyester-based resin extrudate is extruded from a nozzle mold attached to the extruder, and cooled while being cut to produce foaming thermoplasticity Examples thereof include a method for producing polyester resin particles.

なお、上記では、熱可塑性ポリエステル系樹脂発泡粒子を予備発泡させた場合の製造方法を説明したが、必ずしも予備発泡させておく必要はない。非発泡の発泡性熱可塑性ポリエステル系樹脂粒子を製造する場合には、公知の要領で熱可塑性ポリエステル系樹脂粒子を製造し、この熱可塑性ポリエステル系樹脂粒子に物理発泡剤を公知の要領で含浸させて発泡性熱可塑性ポリエステル系樹脂粒子を製造すればよい。   In addition, although the manufacturing method at the time of carrying out preliminary foaming of the thermoplastic polyester-type resin expanded particle was demonstrated above, it is not necessary to carry out preliminary foaming necessarily. When producing non-foaming foamable thermoplastic polyester resin particles, the thermoplastic polyester resin particles are produced in a known manner, and the thermoplastic polyester resin particles are impregnated with a physical foaming agent in a known manner. Thus, foamable thermoplastic polyester resin particles may be produced.

又、化学発泡剤としては、例えば、アゾジカルボンアミド、ジニトロソペンタメチレンテトラミン、ヒドラゾイルジカルボンアミド、重炭酸ナトリウムなどが挙げられる。なお、化学発泡剤は、単独で用いられても二種以上が併用されてもよい。   Examples of the chemical foaming agent include azodicarbonamide, dinitrosopentamethylenetetramine, hydrazoyl dicarbonamide, and sodium bicarbonate. In addition, a chemical foaming agent may be used independently or 2 or more types may be used together.

物理発泡剤は、例えば、プロパン、ノルマルブタン、イソブタン、ノルマルペンタン、イソペンタン、ヘキサンなどの飽和脂肪族炭化水素、ジメチルエーテルなどのエーテル類、塩化メチル、1,1,1,2−テトラフルオロエタン、1,1−ジフルオロエタン、モノクロロジフルオロメタンなどのフロン、二酸化炭素、窒素などが挙げられ、ジメチルエーテル、プロパン、ノルマルブタン、イソブタン、二酸化炭素が好ましく、プロパン、ノルマルブタン、イソブタンがより好ましく、ノルマルブタン、イソブタンが特に好ましい。なお、物理発泡剤は、単独で用いられても二種以上が併用されてもよい。   Physical foaming agents include, for example, propane, normal butane, isobutane, normal pentane, isopentane, hexane and other saturated aliphatic hydrocarbons, ethers such as dimethyl ether, methyl chloride, 1,1,1,2-tetrafluoroethane, 1 , 1-difluoroethane, chlorofluorocarbons such as monochlorodifluoromethane, carbon dioxide, nitrogen and the like, dimethyl ether, propane, normal butane, isobutane and carbon dioxide are preferred, propane, normal butane and isobutane are more preferred, and normal butane and isobutane are preferred. Particularly preferred. In addition, a physical foaming agent may be used independently or 2 or more types may be used together.

熱可塑性ポリエステル系樹脂発泡粒子の表面に接着性樹脂粒子を付着させる。この接着性樹脂粒子を構成している接着樹脂としては、型内発泡成形時において、熱可塑性ポリエステル系樹脂発泡粒子の発泡時に溶融状態となって熱可塑性ポリエステル系樹脂発泡粒子の表面に膜状に付着し、熱可塑性ポリエステル系樹脂発泡粒子を発泡させて得られる熱可塑性ポリエステル系樹脂発泡粒子同士を接着一体化することができれば、特に限定されず、例えば、低密度ポリエチレン、ポリ酢酸ビニル、熱可塑性ポリエステル系樹脂、ポリアミド系樹脂、アイオノマー系樹脂、ポリウレタン系樹脂などの熱可塑性樹脂、エポキシ系樹脂、フェノール系樹脂、ユリア系樹脂、メラミン系樹脂、不飽和ポリエステル系樹脂などの熱硬化性樹脂などが挙げられ、熱可塑性ポリエステル系樹脂が好ましく、接着樹脂の結晶化により発泡成形体の機械的強度が向上するため、結晶性熱可塑性ポリエステル系樹脂がより好ましい。具体的には、熱可塑性ポリエステル系樹脂としては、例えば、DIC社から商品名「M8843」にて市販されているテレフタル酸を主たるジカルボン酸成分とし、ネオペンチルグリコールを主たるグリコール成分としてなる非晶性熱可塑性ポリエステル系樹脂(ガラス転移温度:65.9℃)、東京インキ社から商品名「G−125」にて市販されているテレフタル酸とアジピン酸を主たるジカルボン酸成分とし、エチレングリコールを主たるグリコール成分としてなる結晶性熱可塑性ポリエステル系樹脂(融点:100.6℃、ガラス転移温度:8.3℃)などが挙げられる。   Adhesive resin particles are adhered to the surface of the thermoplastic polyester resin foam particles. As the adhesive resin constituting the adhesive resin particles, during the foam molding in the mold, the thermoplastic polyester resin foam particles are in a molten state when foamed, and are formed into a film on the surface of the thermoplastic polyester resin foam particles. There is no particular limitation as long as the thermoplastic polyester resin foam particles obtained by adhering and foaming the thermoplastic polyester resin foam particles can be bonded and integrated with each other. For example, low density polyethylene, polyvinyl acetate, thermoplasticity Thermoplastic resins such as polyester resins, polyamide resins, ionomer resins, polyurethane resins, etc., epoxy resins, phenol resins, urea resins, melamine resins, unsaturated polyester resins, etc. Thermoplastic polyester resins are preferred, and foaming is achieved by crystallization of the adhesive resin. The mechanical strength of the body is increased, the crystalline thermoplastic polyester resin is more preferable. Specifically, as the thermoplastic polyester resin, for example, terephthalic acid commercially available from DIC under the trade name “M8843” is used as the main dicarboxylic acid component, and neopentyl glycol is used as the main glycol component. Thermoplastic polyester resin (glass transition temperature: 65.9 ° C), terephthalic acid and adipic acid commercially available from Tokyo Ink as trade name “G-125” are the main dicarboxylic acid components, and ethylene glycol is the main glycol. Examples thereof include crystalline thermoplastic polyester resins (melting point: 100.6 ° C., glass transition temperature: 8.3 ° C.) as components.

接着性樹脂粒子を構成している接着樹脂が非晶性である場合、接着樹脂のガラス転移温度は、熱可塑性ポリエステル系樹脂発泡粒子を構成している熱可塑性ポリエステル系樹脂のガラス転移温度又は融点よりも10℃低い温度以下であることが好ましく、熱可塑性ポリエステル系樹脂発泡粒子を構成している熱可塑性ポリエステル系樹脂の融点よりも20℃低い温度以下であることがより好ましく、熱可塑性ポリエステル系樹脂発泡粒子を構成している熱可塑性ポリエステル系樹脂の融点よりも30℃低い温度以下であることが特に好ましい。なお、熱可塑性ポリエステル系樹脂発泡粒子を構成している熱可塑性ポリエステル系樹脂が非晶性である場合にはガラス転移温度を、結晶性である場合には融点を採用する。   When the adhesive resin constituting the adhesive resin particles is amorphous, the glass transition temperature of the adhesive resin is the glass transition temperature or melting point of the thermoplastic polyester resin constituting the thermoplastic polyester resin foamed particles. The temperature is preferably 10 ° C. lower than the temperature, more preferably 20 ° C. lower than the melting point of the thermoplastic polyester resin constituting the thermoplastic polyester resin expanded particles, and the thermoplastic polyester It is particularly preferable that the temperature is 30 ° C. or lower than the melting point of the thermoplastic polyester resin constituting the resin foam particles. When the thermoplastic polyester resin constituting the thermoplastic polyester resin foamed particles is amorphous, the glass transition temperature is used, and when the thermoplastic polyester resin is crystalline, the melting point is used.

接着性樹脂粒子を構成している接着樹脂が結晶性である場合、接着樹脂の融点は、熱可塑性ポリエステル系樹脂発泡粒子を構成している熱可塑性ポリエステル系樹脂のガラス転移温度又は融点よりも10℃低い温度以下であることが好ましく、熱可塑性ポリエステル系樹脂発泡粒子を構成している熱可塑性ポリエステル系樹脂の融点よりも20℃低い温度以下であることがより好ましく、熱可塑性ポリエステル系樹脂発泡粒子を構成している熱可塑性ポリエステル系樹脂の融点よりも30℃低い温度以下であることが特に好ましい。なお、熱可塑性ポリエステル系樹脂発泡粒子を構成している熱可塑性ポリエステル系樹脂が非晶性である場合にはガラス転移温度を、結晶性である場合には融点を採用する。   When the adhesive resin constituting the adhesive resin particles is crystalline, the melting point of the adhesive resin is 10 higher than the glass transition temperature or melting point of the thermoplastic polyester resin constituting the thermoplastic polyester resin foamed particles. It is preferable that the temperature is lower than or equal to 0 ° C., and more preferable that the temperature is lower than or equal to 20 ° C. lower than the melting point of the thermoplastic polyester resin constituting the thermoplastic polyester resin expanded particles. It is particularly preferable that the temperature is 30 ° C. or lower than the melting point of the thermoplastic polyester-based resin constituting the. When the thermoplastic polyester resin constituting the thermoplastic polyester resin foamed particles is amorphous, the glass transition temperature is used, and when the thermoplastic polyester resin is crystalline, the melting point is used.

接着樹脂のガラス転移温度又は融点が上記温度範囲にあると、熱可塑性ポリエステル系樹脂発泡粒子の発泡時に接着性樹脂粒子が十分に溶融した状態となって熱可塑性ポリエステル系樹脂発泡粒子の表面に膜状に付着し、熱可塑性ポリエステル系樹脂発泡粒子を発泡させて得られる熱可塑性ポリエステル系樹脂発泡粒子同士を接着樹脂によって強固に一体化させることができ、得られる発泡成形体は、比荷重などの機械的強度に優れている。   When the glass transition temperature or melting point of the adhesive resin is in the above temperature range, the adhesive resin particles are sufficiently melted when the thermoplastic polyester resin foam particles are foamed, and a film is formed on the surface of the thermoplastic polyester resin foam particles. The thermoplastic polyester resin foam particles obtained by adhering to the shape and foaming the thermoplastic polyester resin foam particles can be firmly integrated with each other by an adhesive resin. Excellent mechanical strength.

熱可塑性ポリエステル系樹脂発泡粒子を構成している熱可塑性ポリエステル系樹脂のガラス転移温度及び融点は、JIS K7122:1987「プラスチックの転移熱測定方法」に記載されている方法で測定した。但し、サンプリング方法・温度条件に関しては以下のように行った。示差走査熱量計装置 DSC6220型(エスアイアイナノテクノロジー(株)製)を用いアルミニウム製測定容器の底にすきまのないよう試料を約6mg充てんして、窒素ガス流量20mL/分のもと30℃で2分間保持し、速度10℃/分で30℃から290℃まで昇温した時に得られたDSC曲線より中間点ガラス転移温度を算出した。この中間点ガラス転移温度は該規格(9.3「ガラス転移温度の求め方」)より求めた。   The glass transition temperature and melting point of the thermoplastic polyester resin constituting the thermoplastic polyester resin foamed particles were measured by the method described in JIS K7122: 1987 “Method for Measuring the Transition Heat of Plastic”. However, the sampling method and temperature conditions were as follows. Using a differential scanning calorimeter DSC6220 (made by SII Nano Technology Co., Ltd.), about 6 mg of the sample is filled at the bottom of the aluminum measurement container so that there is no gap, and the nitrogen gas flow rate is 20 mL / min at 30 ° C. The midpoint glass transition temperature was calculated from the DSC curve obtained when the temperature was raised from 30 ° C. to 290 ° C. at a rate of 10 ° C./min for 2 minutes. The midpoint glass transition temperature was determined from the standard (9.3 “How to determine the glass transition temperature”).

接着性樹脂粒子を構成している接着樹脂のガラス転移温度及び融点は、JIS K7121:1987「プラスチックの転移温度測定方法」に記載されている方法で測定した。但し、サンプリング方法・温度条件に関しては以下のように行った。示差走査熱量計装置 DSC6220型(エスアイアイナノテクノロジー(株)製)を用い、アルミニウム製測定容器の底にすきまのないよう試料を約6mg充てんして、窒素ガス流量20mL/分のもと、30℃から−40℃まで降温した後10分間保持し、−40℃から220℃まで昇温(1st Heating)、10分間保持後220℃から−40℃まで降温(Cooling)、10分間保持後−40℃から220℃まで昇温(2nd Heating)した時のDSC曲線を得た。なお、全ての昇温・降温は速度10℃/分で行い、基準物質としてアルミナを用いた。本発明において、融点とは、2nd Heating過程にみられる融解ピークのトップの温度を読みとった値であり、ガラス転移点とは、2nd Heating過程で得られたDSC曲線より中間点ガラス転移温度のことをいう。又、この中間点ガラス転移温度は該規格(9.3「ガラス転移温度の求め方」)より求めた。   The glass transition temperature and melting point of the adhesive resin constituting the adhesive resin particles were measured by the method described in JIS K7121: 1987 “Method for Measuring Plastic Transition Temperature”. However, the sampling method and temperature conditions were as follows. Using a differential scanning calorimeter DSC6220 (made by SII NanoTechnology Co., Ltd.), about 6 mg of the sample is filled so that there is no gap at the bottom of the aluminum measurement container, and the nitrogen gas flow rate is 20 mL / min. The temperature is lowered from -40 ° C to -40 ° C, held for 10 minutes, heated from -40 ° C to 220 ° C (1st Heating), held for 10 minutes, then cooled from 220 ° C to -40 ° C (Cooling), held for 10 minutes, -40 A DSC curve was obtained when the temperature was raised from 2 ° C. to 220 ° C. (2nd Heating). All the temperature increases / decreases were performed at a rate of 10 ° C./min, and alumina was used as a reference material. In the present invention, the melting point is a value obtained by reading the temperature at the top of the melting peak observed in the 2nd Heating process, and the glass transition point is the midpoint glass transition temperature from the DSC curve obtained in the 2nd Heating process. Say. The midpoint glass transition temperature was determined from the standard (9.3 “How to determine the glass transition temperature”).

熱可塑性ポリエステル系樹脂発泡粒子の表面に付着させる接着性樹脂粒子の量としては、少なすぎると、熱可塑性ポリエステル系樹脂発泡粒子を発泡させて得られる熱可塑性ポリエステル系樹脂発泡粒子同士の一体化が不十分となり、得られる発泡成形体の機械的強度又は衝撃吸収性が低下することがあり、多すぎると、発泡成形体に加わった応力が接着樹脂が障害となって隣接する発泡粒子に伝達されにくくなって発泡成形体の衝撃吸収性が低下することがあるので、熱可塑性ポリエステル系樹脂発泡粒子100重量部に対して0.1〜5重量部に限定され、0.3〜3重量部が好ましい。   If the amount of the adhesive resin particles to be adhered to the surface of the thermoplastic polyester resin foamed particles is too small, the integration of the thermoplastic polyester resin foamed particles obtained by foaming the thermoplastic polyester resin foamed particles is not possible. Insufficient, the mechanical strength or shock absorption of the resulting foamed molded product may decrease, and if it is too much, the stress applied to the foamed molded product is transferred to the adjacent foamed particles due to an obstacle to the adhesive resin. The impact absorbability of the foamed molded article may be reduced, and the amount is limited to 0.1 to 5 parts by weight with respect to 100 parts by weight of the thermoplastic polyester resin foamed particles, and 0.3 to 3 parts by weight. preferable.

熱可塑性ポリエステル系樹脂発泡粒子の表面に付着させる接着性樹脂粒子の平均粒径は、小さすぎると、接着性樹脂粒子同士が凝集し、熱可塑性ポリエステル系樹脂発泡粒子の表面への付着が不均一となり、熱可塑性ポリエステル系樹脂発泡粒子を発泡させて得られる熱可塑性ポリエステル系樹脂発泡粒子同士の接着樹脂を介した熱融着が部分的に不十分となって、発泡成形体の機械的強度又は衝撃吸収性が低下することがあり、大きすぎると、熱可塑性ポリエステル系樹脂発泡粒子の型内発泡成形時に、接着性樹脂粒子が熱可塑性ポリエステル系樹脂発泡粒子の表面に膜状に付着した状態とならず、熱可塑性ポリエステル系樹脂発泡粒子の発泡を阻害し、又は、熱可塑性ポリエステル系樹脂発泡粒子を発泡させて得られる熱可塑性ポリエステル系樹脂発泡粒子同士の熱融着を阻害することがあるので、熱可塑性ポリエステル系樹脂発泡粒子の平均粒径に対して1〜15%に限定され、1〜12%が好ましく、1〜9%がより好ましい。   If the average particle size of the adhesive resin particles to be adhered to the surface of the thermoplastic polyester resin foam particles is too small, the adhesive resin particles aggregate together, and the adhesion of the thermoplastic polyester resin foam particles to the surface is uneven. The thermal fusion through the adhesive resin between the thermoplastic polyester resin foam particles obtained by foaming the thermoplastic polyester resin foam particles is partially insufficient, the mechanical strength of the foam molded article or The impact absorbability may decrease, and if it is too large, the adhesive resin particles adhere to the surface of the thermoplastic polyester resin foam particles in the form of foamed thermoplastic polyester resin foam particles. The thermoplastic polyester obtained by inhibiting the foaming of the thermoplastic polyester resin foamed particles or by foaming the thermoplastic polyester resin foamed particles. 1 to 15% with respect to the average particle size of the thermoplastic polyester resin foamed particles, preferably 1 to 12%, and preferably 1 to 9 % Is more preferable.

熱可塑性ポリエステル系樹脂発泡粒子の平均粒径に対する接着性樹脂粒子の平均粒径の比率(平均粒径比率)は下記式に基づいて算出された値をいう。
平均粒径比率(%)=100×(接着性樹脂粒子の平均粒径)
/(熱可塑性ポリエステル系樹脂発泡粒子の平均粒径)
The ratio of the average particle diameter of the adhesive resin particles to the average particle diameter of the thermoplastic polyester resin expanded particles (average particle diameter ratio) is a value calculated based on the following formula.
Average particle diameter ratio (%) = 100 × (average particle diameter of adhesive resin particles)
/ (Average particle diameter of thermoplastic polyester resin foam particles)

なお、接着性樹脂粒子の平均粒径は、接着性樹脂粒子1gを抽出し、抽出した接着性樹脂粒子を光学顕微鏡を用いて200倍に拡大して拡大写真を撮影する。拡大写真にあらわれた接着性樹脂粒子のうち任意の20個の接着性樹脂粒子について、接着性樹脂粒子を包囲し得る最小径の真円の直径を接着性樹脂粒子の粒径とし、各接着性樹脂粒子の粒径(直径)の相加平均値を接着性樹脂粒子の平均粒径とする。なお、光学顕微鏡としては、例えば、キーエンス社から商品名「デジタルマイクロスコープ VHX−1000」にて市販されている光学顕微鏡を用いることができる。   The average particle diameter of the adhesive resin particles is obtained by extracting 1 g of the adhesive resin particles, enlarging the extracted adhesive resin particles 200 times using an optical microscope, and taking an enlarged photograph. For any 20 adhesive resin particles among the adhesive resin particles shown in the enlarged photograph, the diameter of the perfect circle that can surround the adhesive resin particles is taken as the particle diameter of the adhesive resin particles, and each adhesive property The arithmetic average value of the particle diameter (diameter) of the resin particles is defined as the average particle diameter of the adhesive resin particles. In addition, as an optical microscope, the optical microscope marketed with the brand name "digital microscope VHX-1000" from Keyence Corporation can be used, for example.

熱可塑性ポリエステル系樹脂発泡粒子の平均粒径は、熱可塑性ポリエステル系樹脂発泡粒子1gを抽出し、抽出した熱可塑性ポリエステル系樹脂発泡粒子を光学顕微鏡を用いて10倍に拡大して拡大写真を撮影する。拡大写真にあらわれた熱可塑性ポリエステル系樹脂発泡粒子のうち任意の20個の熱可塑性ポリエステル系樹脂発泡粒子について、熱可塑性ポリエステル系樹脂発泡粒子を包囲し得る最小径の真円の直径を熱可塑性ポリエステル系樹脂発泡粒子の粒径とし、各熱可塑性ポリエステル系樹脂発泡粒子の粒径(直径)の相加平均値を熱可塑性ポリエステル系樹脂発泡粒子の平均粒径とする。なお、光学顕微鏡としては、例えば、キーエンス社から商品名「デジタルマイクロスコープ VHX−1000」にて市販されている光学顕微鏡を用いることができる。   The average particle size of the thermoplastic polyester resin foam particles is 1 g of the thermoplastic polyester resin foam particles extracted, and the extracted thermoplastic polyester resin foam particles are magnified 10 times using an optical microscope to take an enlarged photograph. To do. Of the 20 thermoplastic polyester resin foam particles among the thermoplastic polyester resin foam particles shown in the enlarged photograph, the diameter of the perfect circle that can surround the thermoplastic polyester resin foam particles is the thermoplastic polyester. The average particle diameter of the thermoplastic polyester resin expanded particles is defined as the average particle diameter of the thermoplastic polyester resin expanded particles. In addition, as an optical microscope, the optical microscope marketed with the brand name "digital microscope VHX-1000" from Keyence Corporation can be used, for example.

熱可塑性ポリエステル系樹脂発泡粒子の表面に接着性樹脂粒子を付着させる方法としては、特に限定されず、例えば、(1)熱可塑性ポリエステル系樹脂発泡粒子と接着性樹脂粒子とを一つの袋内に供給し、熱可塑性ポリエステル系樹脂発泡粒子と接着性樹脂粒子を袋内で混合し、熱可塑性ポリエステル系樹脂発泡粒子の表面に静電気でもって接着性樹脂粒子を付着させる方法、(2)熱可塑性ポリエステル系樹脂発泡粒子の表面に接着性樹脂粒子の接着力でもって接着性樹脂粒子を接着させる方法などが挙げられ、簡便にて熱可塑性ポリエステル系樹脂発泡粒子の表面に均一に接着性樹脂粒子を付着させることができることから、上記(1)の方法が好ましい。   The method of attaching the adhesive resin particles to the surface of the thermoplastic polyester resin foam particles is not particularly limited. For example, (1) the thermoplastic polyester resin foam particles and the adhesive resin particles are put in one bag. Supplying the thermoplastic polyester resin foam particles and the adhesive resin particles in a bag, and attaching the adhesive resin particles to the surface of the thermoplastic polyester resin foam particles with static electricity; (2) Thermoplastic polyester Adhesive resin particles can be adhered to the surface of thermoplastic polyester resin foam particles easily and easily. Therefore, the method (1) is preferable.

上述のように、熱可塑性ポリエステル系樹脂発泡粒子の表面に接着性樹脂粒子を付着させた後、この熱可塑性ポリエステル系樹脂発泡粒子を用いて型内発泡成形を行う。先ず、熱可塑性ポリエステル系樹脂発泡粒子を金型のキャビティ内に充填する。   As described above, after the adhesive resin particles are attached to the surface of the thermoplastic polyester resin foam particles, in-mold foam molding is performed using the thermoplastic polyester resin foam particles. First, the thermoplastic polyester resin foam particles are filled into the mold cavity.

しかる後、金型のキャビティ内に水蒸気、熱風、熱水などの熱媒体を供給することによって熱可塑性ポリエステル系樹脂発泡粒子を発泡させる。この熱可塑性ポリエステル系樹脂発泡粒子の発泡時には、熱可塑性ポリエステル系樹脂発泡粒子の表面に付着している接着性樹脂粒子は溶融状態となって熱可塑性ポリエステル系樹脂発泡粒子の表面に全面的に又は部分的に膜状にひろがった状態となっている。   Thereafter, the thermoplastic polyester resin foamed particles are foamed by supplying a heat medium such as water vapor, hot air or hot water into the cavity of the mold. At the time of foaming of the thermoplastic polyester resin foamed particles, the adhesive resin particles adhering to the surface of the thermoplastic polyester resin foamed particles are in a molten state on the entire surface of the thermoplastic polyester resin foamed particles or It is in a state where it is partially expanded like a film.

この状態にて、熱可塑性ポリエステル系樹脂発泡粒子が加熱によって発泡し、熱可塑性ポリエステル系樹脂発泡粒子を発泡させて得られる熱可塑性ポリエステル系樹脂発泡粒子同士は発泡圧力によって熱融着一体化して発泡成形体を形成する。この過程において、上述のように、接着樹脂は熱可塑性ポリエステル系樹脂発泡粒子の表面に膜状にひろがっており、熱可塑性ポリエステル系樹脂発泡粒子の発泡を阻害したり、又は、熱可塑性ポリエステル系樹脂発泡粒子を発泡させて得られる熱可塑性ポリエステル系樹脂発泡粒子同士の熱融着を阻害するようなことはなく、発泡粒子同士は接着樹脂を介して隙間なく密着状態にて熱融着一体化する。   In this state, the thermoplastic polyester resin foam particles are foamed by heating, and the thermoplastic polyester resin foam particles obtained by foaming the thermoplastic polyester resin foam particles are thermally fused and integrated with each other by the foaming pressure. A molded body is formed. In this process, as described above, the adhesive resin spreads in the form of a film on the surface of the thermoplastic polyester resin foamed particles, which inhibits the foaming of the thermoplastic polyester resin foamed particles, or the thermoplastic polyester resin. The thermoplastic polyester resin obtained by foaming the foamed particles does not hinder the heat fusion between the foamed particles, and the foamed particles are heat-bonded and integrated with each other through the adhesive resin without any gaps. .

従って、得られる発泡成形体は、比荷重などの機械的強度及び衝撃吸収性に優れていると共に、熱可塑性ポリエステル系樹脂を含んでいることから優れた耐熱性を有している。   Therefore, the obtained foamed molded article is excellent in mechanical strength such as specific load and impact absorbability, and has excellent heat resistance because it contains a thermoplastic polyester resin.

そして、発泡成形体は、熱可塑性ポリエステル系樹脂発泡粒子同士が接着樹脂を介して熱融着一体化されていることから、熱可塑性ポリエステル系樹脂発泡粒子同士は強固に熱融着一体化しており、比荷重などの機械的強度に優れている。   And, since the foamed thermoplastic resin foam particles are heat-bonded and integrated with each other through an adhesive resin, the thermoplastic polyester resin foam particles are firmly and heat-bonded together. Excellent mechanical strength such as specific load.

具体的には、熱可塑性ポリエステル系樹脂発泡粒子の表面に全面的に又は部分的に接着樹脂が膜状に付着しており、この膜状の接着樹脂を介して熱可塑性ポリエステル系樹脂発泡粒子同士が熱融着一体化している。即ち、熱可塑性ポリエステル系樹脂発泡粒子同士がそれらの発泡圧力によって互いに密着しながら膜状の接着樹脂を介して強固に熱融着一体化しており、発泡成形体の熱可塑性ポリエステル系樹脂発泡粒子間に隙間は殆ど生じておらず、発泡成形体は、比荷重などの機械的強度及び衝撃吸収性に優れている。   Specifically, the adhesive resin is adhered to the surface of the thermoplastic polyester resin expanded particles entirely or partially in a film form, and the thermoplastic polyester resin expanded particles are bonded to each other through the film adhesive resin. Is integrated with heat fusion. That is, the foamed thermoplastic polyester resin particles are tightly heat-sealed and integrated with each other by a foaming adhesive resin while being in close contact with each other by their foaming pressure. There is almost no gap, and the foamed molded article is excellent in mechanical strength such as specific load and shock absorption.

本発明の発泡成形体の製造方法は、上述の如き構成を有していることから、得られる発泡成形体は、熱可塑性ポリエステル系樹脂発泡粒子同士が接着樹脂を介して熱融着一体化しているので、発泡粒子同士が強固に熱融着一体化しており、よって、発泡成形体は、優れた機械的強度、衝撃吸収性及び耐熱性を有している。   Since the method for producing a foamed molded product of the present invention has the above-described configuration, the foamed molded product is obtained by integrating the thermoplastic polyester resin foamed particles by heat fusion via an adhesive resin. Therefore, the foamed particles are firmly heat-bonded and integrated with each other. Therefore, the foamed molded article has excellent mechanical strength, shock absorption and heat resistance.

熱可塑性ポリエステル系樹脂発泡粒子の製造装置の一例を示した模式断面図である。It is the schematic cross section which showed an example of the manufacturing apparatus of a thermoplastic polyester-type resin expanded particle. マルチノズル金型を正面から見た模式図である。It is the schematic diagram which looked at the multi-nozzle mold from the front.

以下に実施例を挙げて本発明を更に詳細に説明するが、本実施例に何ら限定されるものでない。   Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the examples.

(実施例1)
図1及び図2に示した製造装置を用いた。先ず、ポリエチレンテレフタレート(イーストマンケミカル社製 商品名「EASTER−EN099」、融点:238.5℃)100重量部、ポリエチレンテレフタレートにタルクを含有させてなるマスターバッチ(ポリエチレンテレフタレート含有量:60重量%、タルク含有量:40重量%)1.8重量部及び無水ピロメリット酸0.2重量部を含むポリエチレンテレフタレート組成物を口径が65mmで且つL/D比が35の単軸押出機に供給して290℃にて溶融混練した。
Example 1
The manufacturing apparatus shown in FIGS. 1 and 2 was used. First, 100 parts by weight of polyethylene terephthalate (trade name “EASTER-EN099” manufactured by Eastman Chemical Co., Ltd., melting point: 238.5 ° C.), a master batch containing polyethylene terephthalate containing talc (polyethylene terephthalate content: 60% by weight, (Talc content: 40% by weight) A polyethylene terephthalate composition containing 1.8 parts by weight and 0.2 parts by weight of pyromellitic anhydride is fed to a single screw extruder having a diameter of 65 mm and an L / D ratio of 35. Melt kneading was performed at 290 ° C.

続いて、押出機の途中から、イソブタン35重量%及びノルマルブタン65重量%からなるブタンをポリエチレンテレフタレート100重量部に対して表1に示した所定量となるように溶融状態のポリエチレンテレフタレート組成物に圧入して、ポリエチレンテレフタレート中に均一に分散させた。   Subsequently, in the middle of the extruder, a molten polyethylene terephthalate composition containing butane composed of 35% by weight of isobutane and 65% by weight of normal butane has a predetermined amount shown in Table 1 with respect to 100 parts by weight of polyethylene terephthalate. It was press-fitted and dispersed uniformly in polyethylene terephthalate.

しかる後、押出機の前端部において、溶融状態のポリエチレンテレフタレート組成物を280℃に冷却した後、押出機の前端に取り付けたマルチノズル金型1の各ノズルからポリエチレンテレフタレート組成物を押出発泡させた。   Thereafter, the polyethylene terephthalate composition in a molten state was cooled to 280 ° C. at the front end of the extruder, and then the polyethylene terephthalate composition was extruded and foamed from each nozzle of the multi-nozzle mold 1 attached to the front end of the extruder. .

なお、マルチノズル金型1は、出口部11の直径が1mmのノズルを20個有しており、ノズルの出口部11は全て、マルチノズル金型1の前端面10に想定した、直径が139.5mmの仮想円A上に等間隔毎に配設されていた。   The multi-nozzle mold 1 has 20 nozzles having an outlet portion 11 having a diameter of 1 mm, and all the outlet portions 11 of the nozzle are assumed to have a diameter of 139 on the front end face 10 of the multi-nozzle die 1. It was arranged on a virtual circle A of 5 mm at regular intervals.

そして、回転軸2の後端部外周面には、2枚の回転刃5が回転軸2の周方向に180°の位相差でもって一体的に設けられており、各回転刃5はマルチノズル金型1の前端面10に常時、接触した状態で仮想円A上を移動するように構成されていた。   Then, two rotary blades 5 are integrally provided on the outer peripheral surface of the rear end portion of the rotary shaft 2 with a phase difference of 180 ° in the circumferential direction of the rotary shaft 2. It was configured to move on the virtual circle A while always in contact with the front end face 10 of the mold 1.

更に、冷却部材4は、正面円形状の前部41aと、この前部41aの外周縁から後方に向かって延設され且つ内径が320mmの円筒状の周壁部41bとからなる冷却ドラム41を備えていた。そして、供給管41d及び冷却ドラム41の供給口41cを通じて冷却ドラム41内に20℃の冷却水42が供給されていた。   Further, the cooling member 4 includes a cooling drum 41 including a front circular front part 41a and a cylindrical peripheral wall part 41b extending rearward from the outer peripheral edge of the front part 41a and having an inner diameter of 320 mm. It was. Then, 20 ° C. cooling water 42 was supplied into the cooling drum 41 through the supply pipe 41 d and the supply port 41 c of the cooling drum 41.

冷却水42は、供給管41dから冷却ドラム41の周壁部41bの内周面に供給される際の流速に伴う遠心力によって、冷却ドラム41の周壁部41b内周面に沿って螺旋状を描くように前方に向かって進んでおり、冷却液42は、周壁部41bの内周面に沿って進行中に、徐々に進行方向に直交する方向に広がり、その結果、冷却ドラム41の供給口41cより前方の周壁部41bの内周面は冷却液42によって全面的に被覆された状態となっていた。   The cooling water 42 is spirally drawn along the inner peripheral surface of the peripheral wall portion 41b of the cooling drum 41 by the centrifugal force accompanying the flow velocity when being supplied from the supply pipe 41d to the inner peripheral surface of the peripheral wall portion 41b of the cooling drum 41. The cooling liquid 42 gradually spreads in the direction perpendicular to the traveling direction while traveling along the inner peripheral surface of the peripheral wall portion 41b, and as a result, the supply port 41c of the cooling drum 41 The inner peripheral surface of the more peripheral wall portion 41b was in a state of being entirely covered with the coolant 42.

そして、マルチノズル金型1の前端面1aに配設した回転刃5を2500rpmの回転数で回転させてあり、マルチノズル金型1の各ノズルの出口部1bから押出発泡されたポリエチレンテレフタレート押出物を回転刃5によって切断して、予備発泡された略球状の発泡性ポリエチレンテレフタレート粒子を製造した。   The rotating blade 5 disposed on the front end face 1a of the multi-nozzle mold 1 is rotated at a rotational speed of 2500 rpm, and the polyethylene terephthalate extrudate extruded and foamed from the outlet portion 1b of each nozzle of the multi-nozzle mold 1 Was cut with a rotary blade 5 to produce pre-foamed substantially spherical expandable polyethylene terephthalate particles.

この発泡性ポリエチレンテレフタレート粒子は、回転刃5による切断応力によって外方或いは前方に向かって飛ばされ、発泡性ポリエチレンテレフタレート粒子は冷却水42中に進入して直ちに冷却され、冷却ドラム41の排出口41eを通じて冷却水42と共に排出された後、脱水機にて冷却水42と分離された。   The expandable polyethylene terephthalate particles are blown outward or forward by the cutting stress of the rotary blade 5, and the expandable polyethylene terephthalate particles enter the cooling water 42 and are immediately cooled. After being discharged together with the cooling water 42, the water was separated from the cooling water 42 by a dehydrator.

発泡性ポリエチレンテレフタレート粒子の連続気泡率、結晶化度、嵩倍率及び平均粒径は表1に示した通りであった。発泡性ポリエチレンテレフタレート粒子中におけるブタンの含有量はポリエチレンテレフタレート100重量部に対して表1に示した量だけ含有されていた。   The open cell ratio, crystallinity, bulk magnification, and average particle size of the expandable polyethylene terephthalate particles were as shown in Table 1. The butane content in the expandable polyethylene terephthalate particles was contained in the amount shown in Table 1 with respect to 100 parts by weight of polyethylene terephthalate.

金型(雄金型と雌金型)を備えた型内発泡成形機を用意した。雄金型と雌金型とを型締めした状態において、雌雄金型間には内法寸法が縦30mm×横300mm×高さ300mmの直方体形状のキャビティが形成されていた。   An in-mold foam molding machine equipped with molds (male mold and female mold) was prepared. In a state where the male mold and the female mold are clamped, a rectangular parallelepiped cavity having an internal dimension of 30 mm in length, 300 mm in width, and 300 mm in height is formed between the male and male molds.

粉末状の結晶性共重合ポリエステル樹脂(東京インキ社製 商品名「G125」、融点:100.6℃、密度:1.28g/cm3、平均粒径:0.1mm)を接着性樹脂粒子とした。 Powdered crystalline copolyester resin (trade name “G125” manufactured by Tokyo Ink Co., Ltd., melting point: 100.6 ° C., density: 1.28 g / cm 3 , average particle size: 0.1 mm) and adhesive resin particles did.

発泡性ポリエチレンテレフタレート粒子100重量部と接着性樹脂粒子0.5重量部とを一つの袋に供給し、発泡性ポリエチレンテレフタレート粒子と接着性樹脂粒子とを混合し、発泡性ポリエチレンテレフタレート粒子の表面に接着性樹脂粒子を静電気によって均一に付着させた。袋に供給した接着性樹脂粒子の全てを発泡性ポリエチレンテレフタレート粒子の表面に付着させた。   100 parts by weight of expandable polyethylene terephthalate particles and 0.5 part by weight of adhesive resin particles are supplied to one bag, and the foamable polyethylene terephthalate particles and adhesive resin particles are mixed to form the surface of the expandable polyethylene terephthalate particles. Adhesive resin particles were uniformly attached by static electricity. All of the adhesive resin particles supplied to the bag were adhered to the surface of the expandable polyethylene terephthalate particles.

表面に接着性樹脂粒子を付着させた発泡性ポリエチレンテレフタレート粒子を型内発泡成形機の金型のキャビティ内に充填して金型を型締めした。しかる後、金型のキャビティ内に105℃の水蒸気をゲージ圧力0.13MPaにて90秒間に亘って供給して発泡性ポリエチレンテレフタレート粒子を二次発泡させ、発泡性ポリエチレンテレフタレート粒子を二次発泡させて得られたポリエチレンテレフタレート発泡粒子同士をこれらの発泡圧力によって熱融着一体化させて縦30mm×横300mm×高さ300mmの直方体形状の発泡成形体を得た。   Expandable polyethylene terephthalate particles having adhesive resin particles adhered to the surface were filled into the mold cavity of the in-mold foam molding machine, and the mold was clamped. After that, 105 ° C. water vapor is supplied into the mold cavity at a gauge pressure of 0.13 MPa for 90 seconds to cause secondary expansion of the expandable polyethylene terephthalate particles, and secondary expansion of the expandable polyethylene terephthalate particles. The obtained polyethylene terephthalate foamed particles were thermally fused and integrated by these foaming pressures to obtain a rectangular solid foam-shaped molded body having a length of 30 mm × width of 300 mm × height of 300 mm.

次に、金型のキャビティ内に冷却水を供給して発泡成形体を冷却した後にキャビティを開いて発泡成形体を得た。得られた発泡成形体を大気圧下において60℃にて168時間に亘って放置(養生)して発泡成形体を得た。   Next, cooling water was supplied into the mold cavity to cool the foam molded article, and then the cavity was opened to obtain a foam molded article. The obtained foamed molded product was allowed to stand (cured) at 60 ° C. for 168 hours under atmospheric pressure to obtain a foamed molded product.

(実施例2)
接着性樹脂粒子の使用量を2.0重量部としたこと以外は実施例1と同様にして発泡成形体を得た。
(Example 2)
A foamed molded article was obtained in the same manner as in Example 1 except that the amount of the adhesive resin particles used was 2.0 parts by weight.

(実施例3)
粉末状の非晶性熱可塑性ポリエステル系樹脂(DIC社製 製品名「M−8843」、ガラス転移温度:65.9℃、密度:1.35g/cm3、平均粒径:2.0mm)を乳鉢を用いて粉砕し、平均粒径が0.1mmの接着性樹脂粒子を作製した。この接着性樹脂粒子を用いたこと以外は実施例1と同様にして発泡成形体を得た。
(Example 3)
Powdered amorphous thermoplastic polyester resin (product name “M-8843” manufactured by DIC, glass transition temperature: 65.9 ° C., density: 1.35 g / cm 3 , average particle size: 2.0 mm) It grind | pulverized using the mortar and produced the adhesive resin particle whose average particle diameter is 0.1 mm. A foamed molded article was obtained in the same manner as in Example 1 except that the adhesive resin particles were used.

(実施例4)
粉末状の非晶性熱可塑性ポリエステル系樹脂(DIC社製 製品名「M−8843」、ガラス転移温度:65.9℃、密度:1.35g/cm3、平均粒径:2.0mm)を乳鉢を用いて粉砕し、平均粒径が0.4mmの接着性樹脂粒子を作製した。この接着性樹脂粒子を用いたこと以外は実施例1と同様にして発泡成形体を得た。
Example 4
Powdered amorphous thermoplastic polyester resin (product name “M-8843” manufactured by DIC, glass transition temperature: 65.9 ° C., density: 1.35 g / cm 3 , average particle size: 2.0 mm) It grind | pulverized using the mortar and produced the adhesive resin particle whose average particle diameter is 0.4 mm. A foamed molded article was obtained in the same manner as in Example 1 except that the adhesive resin particles were used.

(実施例5)
押出機の途中から、イソブタン35重量%及びノルマルブタン65重量%からなるブタンをポリエチレンテレフタレート100重量部に対して表1に示した所定量となるように溶融状態のポリエチレンテレフタレート組成物に圧入したこと、連続気泡率、結晶化度、嵩倍率、平均粒径及びポリエチレンテレフタレート100重量部に対するブタンの含有量が表1に示した通りである発泡性ポリエチレンテレフタレート粒子を用いたこと、実施例4で作製した接着性樹脂粒子を用いたこと以外は実施例1と同様にして発泡成形体を得た。
(Example 5)
From the middle of the extruder, butane consisting of 35% by weight of isobutane and 65% by weight of normal butane was pressed into the polyethylene terephthalate composition in a molten state so as to have a predetermined amount shown in Table 1 with respect to 100 parts by weight of polyethylene terephthalate. , Produced in Example 4 using foamable polyethylene terephthalate particles whose open cell ratio, crystallinity, bulk magnification, average particle diameter, and butane content with respect to 100 parts by weight of polyethylene terephthalate are as shown in Table 1. A foamed molded product was obtained in the same manner as in Example 1 except that the adhesive resin particles thus obtained were used.

(比較例1)
発泡性ポリエチレンテレフタレート粒子の表面に接着性樹脂粒子を付着させなかったこと以外は実施例1と同様にして発泡成形体を得た。
(Comparative Example 1)
A foamed molded article was obtained in the same manner as in Example 1 except that the adhesive resin particles were not adhered to the surface of the expandable polyethylene terephthalate particles.

(比較例2)
接着性樹脂粒子の使用量を7.0重量部としたこと以外は実施例1と同様にして発泡成形体を得た。
(Comparative Example 2)
A foamed molded article was obtained in the same manner as in Example 1 except that the amount of the adhesive resin particles used was 7.0 parts by weight.

(比較例3)
粉末状の非晶性熱可塑性ポリエステル系樹脂(DIC社製 製品名「M−8843」、ガラス転移温度:65.9℃、密度:1.35g/cm3、平均粒径:2.5mm)を接着性樹脂粒子として用いたこと以外は実施例1と同様にして発泡成形体を得た。
(Comparative Example 3)
Powdered amorphous thermoplastic polyester resin (product name “M-8843” manufactured by DIC, glass transition temperature: 65.9 ° C., density: 1.35 g / cm 3 , average particle size: 2.5 mm) A foamed molded article was obtained in the same manner as in Example 1 except that it was used as adhesive resin particles.

(比較例4)
押出機の途中から、イソブタン35重量%及びノルマルブタン65重量%からなるブタンをポリエチレンテレフタレート100重量部に対して表1に示した所定量となるように溶融状態のポリエチレンテレフタレート組成物に圧入したこと、連続気泡率、結晶化度、嵩倍率、平均粒径及びポリエチレンテレフタレート100重量部に対するブタンの含有量が表1に示した通りである発泡性ポリエチレンテレフタレート粒子を用いたこと、粉末状の非晶性熱可塑性ポリエステル系樹脂(DIC社製 製品名「M−8843」、ガラス転移温度:65.9℃、密度:1.35g/cm3、平均粒径:2.0mm)を乳鉢を用いて粉砕し、平均粒径が1.5mmの接着性樹脂粒子を作製し、この接着性樹脂粒子を用いたこと以外は実施例1と同様にして発泡成形体を得た。
(Comparative Example 4)
From the middle of the extruder, butane consisting of 35% by weight of isobutane and 65% by weight of normal butane was pressed into the polyethylene terephthalate composition in a molten state so as to have a predetermined amount shown in Table 1 with respect to 100 parts by weight of polyethylene terephthalate. , Foamed polyethylene terephthalate particles having an open cell ratio, crystallinity, bulk magnification, average particle diameter, and butane content with respect to 100 parts by weight of polyethylene terephthalate as shown in Table 1, powdered amorphous A thermoplastic thermoplastic resin (product name “M-8843” manufactured by DIC, glass transition temperature: 65.9 ° C., density: 1.35 g / cm 3 , average particle size: 2.0 mm) using a mortar In the same manner as in Example 1 except that adhesive resin particles having an average particle diameter of 1.5 mm were prepared and the adhesive resin particles were used. Thus, a foamed molded product was obtained.

実施例の発泡成形体は、ポリエチレンテレフタレート発泡粒子の表面に部分的に接着樹脂が膜状に付着しており、ポリエチレンテレフタレート発泡粒子同士が膜状の接着樹脂を介して隙間なく互いに密着した状態に熱融着一体化していた。   In the foamed molded body of the example, the adhesive resin is partially attached to the surface of the polyethylene terephthalate foamed particles, and the polyethylene terephthalate foamed particles are in close contact with each other through the film-like adhesive resin without gaps. Heat fusion was integrated.

得られた発泡成形体について比荷重を下記の要領で測定し、その結果を表1に示した。   The specific load of the obtained foamed molded product was measured in the following manner, and the results are shown in Table 1.

(比荷重)
発泡成形体の曲げ試験における荷重を小型卓上試験機(日本電産シンポ社製 商品名「FGS−1000TV/1000N+FGP−100」)及び小型卓上試験機用ソフトウェア「FGS−TV Ver2」を用いて測定した。冶具は日本電産シンポ社製の「FGTT-531」を用いた。発泡成形体から縦100mm×横15mm×高さ10mmの試験片を切り出した。この試験片についてロードセル1000N、試験速度5mm/分、支持台の先端治具5Rの条件下にて最大荷重を測定し、最大荷重を試験片の重量で除して得られた値を比荷重とした。
(Specific load)
The load in the bending test of the foamed molded article was measured using a small tabletop testing machine (trade name “FGS-1000TV / 1000N + FGP-100” manufactured by Nidec Symposium) and software “FGS-TV Ver2” for a small tabletop testing machine. . As the jig, “FGTT-531” manufactured by Nidec Symposium was used. A test piece having a length of 100 mm, a width of 15 mm, and a height of 10 mm was cut out from the foam molded article. For this test piece, the maximum load was measured under the conditions of a load cell of 1000 N, a test speed of 5 mm / min, and the tip jig 5R of the support base, and the value obtained by dividing the maximum load by the weight of the test piece was taken as the specific load. did.

Figure 2014198380
Figure 2014198380

1 マルチノズル金型
2 回転軸
4 冷却部材
5 回転刃
1 Multi-nozzle mold 2 Rotating shaft 4 Cooling member 5 Rotating blade

Claims (5)

熱可塑性ポリエステル系樹脂発泡粒子の表面に、この熱可塑性ポリエステル系樹脂発泡粒子の平均粒径に対して1〜15%の平均粒径を有する接着性樹脂粒子を上記熱可塑性ポリエステル系樹脂発泡粒子100重量部に対して0.1〜5重量部付着させた後、上記熱可塑性ポリエステル系樹脂発泡粒子を金型に充填して加熱して発泡させ、上記熱可塑性ポリエステル系樹脂発泡粒子を発泡させて得られる熱可塑性ポリエステル系樹脂発泡粒子同士を熱融着一体化させることを特徴とする発泡成形体の製造方法。 Adhesive resin particles having an average particle size of 1 to 15% with respect to the average particle size of the thermoplastic polyester resin foam particles are formed on the surface of the thermoplastic polyester resin foam particles. After 0.1 to 5 parts by weight is adhered to parts by weight, the thermoplastic polyester resin expanded particles are filled in a mold and heated to foam, and the thermoplastic polyester resin expanded particles are expanded. A method for producing a foamed molded article, wherein the obtained foamed thermoplastic polyester resin particles are heat-sealed and integrated. 接着性樹脂粒子は熱可塑性ポリエステル系樹脂発泡粒子の発泡途上において溶融し、上記熱可塑性ポリエステル系樹脂発泡粒子の表面に膜状に付着した状態となることを特徴とする請求項1に記載の発泡成形体の製造方法。 2. The foaming according to claim 1, wherein the adhesive resin particles melt in the course of foaming of the thermoplastic polyester resin foamed particles, and are in a film-like state attached to the surface of the thermoplastic polyester resin foamed particles. Manufacturing method of a molded object. 接着性樹脂粒子が熱可塑性ポリエステル系樹脂であることを特徴とする請求項1又は請求項2に記載の発泡成形体の製造方法。 The method for producing a foamed molded article according to claim 1 or 2, wherein the adhesive resin particles are a thermoplastic polyester resin. 接着性樹脂粒子が結晶性熱可塑性ポリエステル系樹脂であることを特徴とする請求項3に記載の発泡成形体の製造方法。 The method for producing a foamed molded article according to claim 3, wherein the adhesive resin particles are a crystalline thermoplastic polyester resin. 請求項1〜4の何れか1項に記載の発泡成形体の製造方法により製造されてなることを特徴とする発泡成形体。 A foam molded article produced by the method for producing a foam molded article according to any one of claims 1 to 4.
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JPH1077359A (en) * 1996-07-10 1998-03-24 Mitsubishi Chem Basf Co Ltd Expanded resin bead
JP2001062860A (en) * 1999-08-25 2001-03-13 Sekisui Chem Co Ltd Composite foamed molding and manufacture thereof
WO2005037518A1 (en) * 2003-10-17 2005-04-28 Shiina Kasei Co. Method for producing plastic foamed composite
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