本発明の請求項1に記載の発泡成形体は、一般式M2O・nSiO2(但し、Mはナトリウムやカリウムのアルカリ金属を示し、nはモル比を示す)で表される水溶性アルカリ珪酸塩を処理して形成した発泡剤を熱可塑性樹脂材と接触させた状態で前記熱可塑性樹脂材の溶融温度で発泡させてできた発泡成形体において、前記熱可塑性樹脂はスーパーエンジニアリングプラスチックであって、前記発泡剤が発泡して形成された多数個の気泡部の表面を前記スーパーエンジニアリングプラスチックで被覆するとともに前記多数個の気泡部間を連結させてできたことを特徴とする。同請求項2に記載の発泡成形体は、請求項1において、前記発泡剤は、硼砂、硼酸などの硼素化合物や水酸化マグネシウム、水酸化カルシウム、水酸化アルミニウムなどの水溶性金属化合物を1種または2種以上組み合わせて、水溶性アルカリ珪酸塩に混合し処理して形成した発泡剤であることを特徴とする。同請求項3に記載の発泡成形体の製造方法は、一般式M2O・nSiO2(但し、Mはナトリウムやカリウムのアルカリ金属を示し、nはモル比を示す)で表される水溶性アルカリ珪酸塩を処理して形成した発泡剤を熱可塑性樹脂材の存在状態で前記熱可塑性樹脂材の溶融温度で発泡させる発泡成形体の製造方法において、一般式M2O・nSiO2(但し、Mはナトリウムやカリウムのアルカリ金属を示し、nはモル比を示す)で表される水溶性アルカリ珪酸塩を処理して形成した発泡剤を熱可塑性樹脂材の存在状態で前記熱可塑性樹脂材の溶融温度で発泡させる発泡成形体の製造方法において、前記熱可塑性樹脂はスーパーエンジニアリングプラスチックであって、前記水溶性アルカリ珪酸塩としてモル比が2〜3.2の珪酸ナトリウム水溶液を用い、前記モル比が2〜3.2の珪酸ナトリウム水溶液を乾燥させて5〜30重量%の含水分量とする珪酸ナトリウム固体を粉砕して粒子状の発泡剤を得る発泡剤形成工程と、前記粒子状の発泡剤と前記スーパーエンジニアリングプラスチックとを混合して混合物とする混合工程と、前記混合物を前記スーパーエンジニアリングプラスチックの融点以上の温度で加熱して前記発泡剤を発泡させて多数個の気泡部を形成するとともに前記気泡部の外周に前記溶融したスーパーエンジニアリングプラスチックの被膜を形成する加熱発泡工程と、冷却することにより前記溶融したスーパーエンジニアリングプラスチックの被膜が固化して多数個の気泡部間を前記被膜で連結させてできた発泡成形体を得る冷却工程とからなることを特徴とする。同請求項4に記載の発泡成形体の製造方法は、請求項3において、前記発泡剤形成工程において、硼砂、硼酸などの硼素化合物や水酸化マグネシウム、水酸化カルシウム、水酸化アルミニウムなどの水溶性金属化合物を1種または2種以上組み合わせて前記水溶性アルカリ珪酸塩に混合し処理して粒子状の発泡剤を得ることを特徴とする。The foamed molded product according to claim 1 of the present invention is a water-soluble alkali silicate represented by the general formula M2O · nSiO2 (where M represents an alkali metal of sodium or potassium and n represents a molar ratio). In a foamed molded product formed by foaming a foaming agent formed by treatment at a melting temperature of the thermoplastic resin material in a state of being in contact with the thermoplastic resin material, the thermoplastic resin is a super engineering plastic and is described above. It is characterized in that the surface of a large number of bubble portions formed by foaming a foaming agent is covered with the super engineering plastic and the large number of bubble portions are connected to each other. The foamed molded product according to claim 2 is the foamed product according to claim 1, wherein the foaming agent is one kind of a boron compound such as borax and boric acid and a water-soluble metal compound such as magnesium hydroxide, calcium hydroxide and aluminum hydroxide. Alternatively, it is a foaming agent formed by combining two or more kinds and mixing them with a water-soluble alkaline silicate. The method for producing a foamed molded product according to claim 3 is a water-soluble alkaline silicate represented by the general formula M2O · nSiO2 (where M represents an alkali metal of sodium or potassium and n represents a molar ratio). In the method for producing a foamed molded product in which the foaming agent formed by the above treatment is foamed at the melting temperature of the thermoplastic resin material in the presence of the thermoplastic resin material, the general formula M2O · nSiO2 (where M is sodium or potassium). Foaming agent formed by treating a water-soluble alkali silicate represented by (n) indicating an alkali metal and n indicating a molar ratio is foamed at the melting temperature of the thermoplastic resin material in the presence of the thermoplastic resin material. In the method for producing a molded product, the thermoplastic resin is a super engineering plastic, and a sodium silicate aqueous solution having a molar ratio of 2 to 3.2 is used as the water-soluble alkaline silicate, and the molar ratio is 2 to 3.2. The foaming agent forming step of drying the sodium silicate aqueous solution to obtain a particulate foaming agent by crushing the sodium silicate solid having a water content of 5 to 30% by weight, the particulate foaming agent and the super engineering plastic . And the mixing step of mixing the mixture to form a mixture, and heating the mixture at a temperature equal to or higher than the melting point of the super engineering plastic to foam the foaming agent to form a large number of bubble portions, and the outer periphery of the bubble portions. and heating and foaming step of forming a film of molten super engineering plastics, the molten coating super engineering plastics have Deki by between multiple solidified pieces of bubble portion is connected with the coating foam moldings by cooling It is characterized by comprising a cooling step to obtain. The method for producing a foamed molded product according to claim 4 is the method for producing a foamed molded product according to claim 3, wherein in the foaming agent forming step , a boron compound such as borosand and boric acid and water-soluble such as magnesium hydroxide, calcium hydroxide and aluminum hydroxide are used. It is characterized in that one kind or a combination of two or more kinds of metal compounds are mixed with the water-soluble alkaline silicate and treated to obtain a granular foaming agent .
本発明の発泡成形体は、一般式M2O・nSiO2(但し、Mはナトリウムやカリウムのアルカリ金属を示し、nはモル比を示す)で表される水溶性アルカリ珪酸塩を処理して形成した発泡剤を熱可塑性樹脂材と接触させた状態で前記熱可塑性樹脂材の溶融温度で発泡させてできた発泡成形体において、前記熱可塑性樹脂にスーパーエンジニアリングプラスチックであって、前記発泡剤が発泡して形成された多数個の気泡部の表面を前記スーパーエンジニアリングプラスチックで被覆するとともに前記多数個の気泡部間を連結させてできた発泡成形体であるので、さらに、硼砂、硼酸などの硼素化合物や水酸化マグネシウム、水酸化カルシウム、水酸化アルミニウムなどの水溶性金属化合物を1種または2種以上組み合わせて前記水溶性アルカリ珪酸塩に混合し処理して形成した発泡剤が発泡して形成された多数個の気泡部の表面を前記スーパーエンジニアリングプラスチックで被覆するとともに前記多数個の気泡部間を連結させてできた発泡成形体であるので、また、その製造方法を提供することにより、PPS樹脂などのスーパーエンジニアリングプラスチックを用いて多数個の気泡部を確保できて、緩衝材、断熱材、吸音材、ろ過材または電気絶縁材に有用であり、自動車、飛行機、搬送器機などの軽量化に役立て省エネルギー対策の一旦を担うことができる。The foamed molded product of the present invention is a foam formed by treating a water-soluble alkali silicate represented by the general formula M2O · nSiO2 (where M represents an alkali metal of sodium or potassium and n represents a molar ratio). In a foamed molded product formed by foaming the agent at the melting temperature of the thermoplastic resin material in a state of being in contact with the thermoplastic resin material, the thermoplastic resin is a super engineering plastic and the foaming agent foams. Since it is a foamed molded product formed by covering the surface of a large number of formed bubble portions with the super engineering plastic and connecting the large number of bubble portions , further, boron compounds such as borosand and boric acid and water are used. A large number of foaming agents formed by mixing one or more water-soluble metal compounds such as magnesium oxide, calcium hydroxide, and aluminum hydroxide with the water-soluble alkali silicate and treating it. Since it is a foamed molded product formed by covering the surface of the bubble portion of the above with the super engineering plastic and connecting the large number of the bubble portions, by providing a method for producing the foam molded body, a super such as PPS resin can be provided. A large number of air bubbles can be secured by using engineering plastic, which is useful for cushioning materials, heat insulating materials, sound absorbing materials, filtering materials or electrical insulating materials, and is useful for weight reduction of automobiles, airplanes, conveyors, etc. You can take charge once.