Production method of expanded polyethylene/polystyrene beads

A technology for foaming polyethylene and polystyrene particles, applied in the field of foaming materials, can solve problems such as weak mechanical rigidity of materials, and achieve the effects of improving production efficiency, high production efficiency and foaming ratio, and reducing production costs.

Active Publication Date: 2017-04-26
无锡道石新材料有限公司
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  • Abstract
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Problems solved by technology

However, because the molecular chain of EPE material is mostly o

Method used

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  • Production method of expanded polyethylene/polystyrene beads
  • Production method of expanded polyethylene/polystyrene beads
  • Production method of expanded polyethylene/polystyrene beads

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] Table one is the batch list of main material (listed in the table as parts by weight)

[0025]

[0026]

[0027] Table two is a list of auxiliary ingredients (listed as parts by weight in the table)

[0028]

[0029] Dispersants can be selected from kaolin, calcium phosphate, etc., defoamers can be selected from silane defoamers, surfactants can be selected from calcium stearate, sodium dodecylbenzenesulfonate, cetyltrimethylammonium bromide Wait.

[0030] Table 3 Pressurization pressure and schedule

[0031]

[0032] The pressurization method adopts the injection of supercritical CO 2 , for gasification and pressurization. Under the same pressure, the uniformity of foamed polyethylene / polystyrene cells can be effectively controlled by adopting segmented pressure, and the expansion of foamed polyethylene / polystyrene can also be improved...

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Abstract

The invention discloses a production method of expanded polyethylene/polystyrene beads. The production method is characterized by comprising the following steps: (1) uniformly mixing polyethylene resin, polystyrene resin, a compatilizer, a crystallization nucleation adjuvant and other processing adjuvants, and carrying out mixing, extrusion, drawing and granulation through an extruder to prepare modified polyethylene/polystyrene particles; and (2) feeding the modified polyethylene/polystyrene particles into a reaction kettle, injecting supercritical CO2, segmentally pressurizing step by step under heating to enable gas to fully penetrate into the modified polyethylene/polystyrene resin, generating internal pressure for outward expansion, and then instantly releasing the pressure to be equal to the atmospheric pressure after certain time to obtain the expanded polyethylene/polystyrene beads with a certain ratio. The production method overcomes the shortcomings of low bonding strength among the EPS beads and low rigidity of EPE. Meanwhile, the foaming process is low in production cost, high in production efficiency and favorable for implementing industrialization, and can be widely applied to the fields of automotive interior trim parts, packaging materials, building materials, heat isolation materials and the like.

Description

technical field [0001] The invention relates to the field of foamed materials, in particular to foamed polyethylene / polystyrene beads. Background technique [0002] As a traditional foaming material, expanded polystyrene (EPS) is favored by domestic and foreign manufacturers for its excellent heat insulation and mechanical rigidity, and its output accounts for more than 95% of the foamed products industry. However, there is a fatal defect in EPS foam beads, that is, the adhesion between beads is poor after being processed into products. Expanded polyethylene (EPE) is a new type of environmentally friendly material with excellent heat insulation, compression resistance, and cushioning properties. Compared with EPS, the bonding strength between EPE particles is stronger. However, because the molecular chain of EPE material is mostly olefin structure, the mechanical rigidity of the material is weak. [0003] The foamed polyethylene / polystyrene composite material not only has ...

Claims

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Application Information

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IPC IPC(8): C08J9/18C08J9/12C08L23/06C08L51/04C08L53/02C08K13/02C08K3/22C08K3/26C08K3/38C08K3/34C08K5/098C08K5/092C08K5/09
Inventor 倪忠斌陈明清刘士荣张红武侯荣杰
Owner 无锡道石新材料有限公司
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