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Process for producing thermoplastic elastomer composition foam body, and thermoplastic elastomer composition for foam injection molding

A technology for thermoplastic elastomers and manufacturing methods, which is applied in the field of manufacturing thermoplastic elastomer composition foams and thermoplastic elastomer compositions for foam injection molding, and can solve the problem of uneven size and shape of foaming units and decreased flexibility , large foaming unit, etc., to achieve excellent uniformity

Inactive Publication Date: 2009-07-01
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the foam of the aromatic vinyl compound-based thermoplastic elastomer composition, especially the styrene-based thermoplastic elastomer composition, by the conventional foam injection molding method, due to the large foaming unit, or due to the The size and shape of the cell are not uniform, resulting in a decrease in softness, and the fineness of the cell and the uniformity of the cell are not fully satisfactory

Method used

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  • Process for producing thermoplastic elastomer composition foam body, and thermoplastic elastomer composition for foam injection molding
  • Process for producing thermoplastic elastomer composition foam body, and thermoplastic elastomer composition for foam injection molding
  • Process for producing thermoplastic elastomer composition foam body, and thermoplastic elastomer composition for foam injection molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] (Preparation of thermoplastic elastomer composition)

[0158] 100 parts by weight of hydrogenated styrene-conjugated diene-styrene block copolymer of A-1, 70 parts by weight of B-1 acrylic resin to 1100 parts by weight of A-1100 180 parts by weight of C-1 mineral oil, 0.05 parts by weight of erucamide (NEUTRON S (trade name) manufactured by Nippon Seika Co., Ltd.) ), 0.05 parts by weight of calcium stearate and 0.15 parts by weight of antioxidant (0.1 parts by weight of IRGANOX 1010 (trade name) manufactured by Ciba Specialty Chemicals Co., Ltd., 0.05 parts by weight of Ultranox 626 (trade name) manufactured by GE Specialty Chemicals) Melting and kneading in an internal mixer, and then molding into pellets to obtain pellets of a thermoplastic elastomer composition.

[0159] (Manufacture of foam injection moldings)

[0160]The injection molding machine adopts ES2550 / 400HL-Mu Cell (clamping force 400t) made by ENGEL Company. Body central part) mold for foam injection m...

Embodiment 2

[0162] Replace the hydrogenated product of the styrene-conjugated diene-styrene block copolymer of A-1 with the hydrogenated product of the styrene-conjugated diene-styrene block copolymer of A-2 of 100 parts by weight, B -1 The propylene-based resin was 56 parts by weight with respect to 100 parts by weight of A-2, and the mineral oil of C-1 was 67 parts by weight with respect to 100 parts by weight of A-2. The evaluation results are shown in Table 1 and Table 2.

Embodiment 3

[0164] Replace the hydrogenated product of the styrene-conjugated diene-styrene block copolymer of A-1 with the hydrogenated product of the styrene-conjugated diene-styrene block copolymer of A-3 of 100 parts by weight, B -1 was 56 parts by weight of propylene-based resin with respect to 100 parts by weight of A-3, and the mineral oil of C-1 was 67 parts by weight with respect to 100 parts by weight of A-3. The evaluation results are shown in Table 1 and Table 2.

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Abstract

A process for producing a thermoplastic elastomer composition foam body is provided that includes, in sequence, a step of injecting by an injection molding machine into a cavity of a mold for injection molding a foaming agent and a thermoplastic elastomer composition comprising component (A), component (B), and component (C) below, component (B) having a content of 5 to 150 parts by weight relative to 100 parts by weight of component (A) and component (C) having a content of 5 to 300 parts by weight relative to 100 parts by weight of component (A), a step of holding for not less than 4 seconds after completion of the injection, and a step of enlarging the volume of the cavity by moving a wall face of the cavity to a predetermined position. (A): A hydrogenated product of a block copolymer comprising a block composed of an aromatic vinyl compound-based monomer unit and a block composed of a conjugated diene compound-based monomer unit, (B): a propylene resin, and (C): a mineral oil.

Description

technical field [0001] The present invention relates to a method for producing a thermoplastic elastomer composition foam and a thermoplastic elastomer composition for foam injection molding. Background technique [0002] Currently, foamed parts requiring flexibility, heat resistance, etc., such as automotive interior materials and home appliance parts, are formed of styrene-based thermoplastic elastomer compositions containing hydrogenated products of block copolymers and polypropylene-based resins as follows: A foam, the block copolymer comprising a block composed of monomer units based on an aromatic vinyl compound and a block composed of monomer units based on a conjugated diene compound. [0003] As a method for producing the foam, from the viewpoint of improving productivity, a foam injection molding method is used. For example, the following method for producing a foam is described in Japanese Patent Laid-Open No. 6-218741, which is characterized in that: (a) A styre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/04C08L53/02C08K5/00C08L23/10B29C44/38B29C45/56
Inventor 布施一芳山本裕也
Owner SUMITOMO CHEM CO LTD
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