Expandable polystyrene resin beads, process for the preparation of them, and foam made by using the same

A polystyrene and resin particle technology, applied in the field of foam, can solve the problems of low welding ratio and insufficient crack resistance.

Inactive Publication Date: 2000-01-19
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] If this method is followed, the granulation process can be omitted, which is advantageous in terms of cost. However, the obtained foam, especially the foam obtained by forming pre-expanded particles in the mold cavity, has its advantages. Body, the ratio of fusion with pre-expanded particles (welding rate) is low, and its crack resistance (falling ball impact strength) is not good enough

Method used

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  • Expandable polystyrene resin beads, process for the preparation of them, and foam made by using the same
  • Expandable polystyrene resin beads, process for the preparation of them, and foam made by using the same
  • Expandable polystyrene resin beads, process for the preparation of them, and foam made by using the same

Examples

Experimental program
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reference example 1

[0139] Reference example 1 (manufacturing polystyrene resin particles according to a polymerization method)

[0140] Add 3000 parts of aqueous dispersion medium and various ingredients to a 5-liter reactor with an inlet and a flat stirring blade in the lower part, so that the final mixture contains calcium phosphate fine powder 3000ppm, polyvinyl alcohol (づ-セノ-ル PH-20: manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) 50 ppm, sodium dodecylbenzenesulfonate 50 ppm, and stirring was started.

[0141] Then, 2.1 parts of benzoyl peroxide and 0.35 parts of methyl methacrylate-butyl acrylate copolymer (Kane-Es PA-20 manufactured by Zhongyuan Chemical Co., Ltd.) as a nucleating agent were dissolved in styrene mono In 700 parts of the body, the mixed solution is supplied to a machine such as Figure 9 In the shown droplet generating device having 5 nozzles with a diameter of 0.2 mm, a mechanical vibration of 500 Hz is applied to it so that a droplet group 8 is generated in...

Embodiment 7

[0149] Except using the polystyrene particle that reference example 1 manufactures as raw material, all the other obtain expandable polystyrene particle similarly with embodiment 1, then carry out pre-foaming and molding in mold cavity similarly with embodiment 1, A foamed molded body was obtained.

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Abstract

Foamable modified polystyrene resin particles (E) comprising a particle of a modified polystyrene resin (C) containing a blowing agent (D), wherein the modified polystyrene resin (C) comprises conjugated diene polymer rubber particles (B) dispersed uniformly throughout a polystyrene resin (A) and when the foamable modified polystyrene resin particle (E) is expanded, there is substantially no deformation of the rubber particles (B) before and after the expansion. A foamed article of a modified polystyrene resin which has a cell membrane of the modified polystyrene resin comprising a polystyrene resin and conjugated diene polymer rubber particles dispersed uniformly throughout the polystyrene resin and has a fusion rate of not less than 50 %, wherein the rubber particles maintain substantially spherical form in the cell membrane. According to the present invention, the foamed article of the modified polystyrene resin having break resistance and fusion rate which are equal to those of a high impact polystyrene foamed article can be provided at low cost.

Description

technical field [0001] The present invention relates to expandable modified polystyrene resin particles, a method for producing the same, and a foam excellent in crack resistance using the resin particles. Background technique [0002] It is known that foams obtained by impregnating polystyrene resin particles with a foaming agent to obtain expandable polystyrene resin particles and then foam molding such resin particles are prone to cracks. In order to overcome this phenomenon, someone proposes to use the method that the block copolymer of styrene and butadiene is mechanically mixed into the polystyrene resin (with reference to the publication No. Publication No.), using a resin with excellent impact resistance obtained by polymerizing styrene monomer in the presence of conjugated diene-based polymer particles, that is, so-called impact-resistant polystyrene resin (HIPS) particles (Japanese Patent Publication No. 47-18428, Japanese Patent Application Publication No. 7-9010...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/22C08J9/18
CPCC08J2351/00B29B9/10C08J2203/14C08J2325/04C08J9/18C08J9/22
Inventor 大原英一山口英宏中村京一
Owner KANEKA CORP
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