Production method of extruded polystyrene foam for supercritical carbon dioxide foam insulation

A technology of extruded polystyrene and carbon dioxide, which is applied in the field of extruded polystyrene foam plastics for heat insulation, can solve the problems that the products cannot reach the qualified quality, and achieve the effects of lowering the temperature, increasing the dispersion coefficient, and increasing the outlet back pressure

Inactive Publication Date: 2012-02-22
新疆西龙土工新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention also provides a gradual mixing screw, which overcomes the deficiencies of the above-mentioned prior art, and can effectively solve the problem that the existing pusher screw cannot make the product reach acceptable quality when it is used for carbon dioxide foaming
[0008] The present invention also provides a back-pressure mixing screw, which overcomes the deficiencies of the above-mentioned prior art, and can effectively solve the problem that the existing pusher screw cannot make the product reach acceptable quality when it is used for carbon dioxide foaming

Method used

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  • Production method of extruded polystyrene foam for supercritical carbon dioxide foam insulation
  • Production method of extruded polystyrene foam for supercritical carbon dioxide foam insulation
  • Production method of extruded polystyrene foam for supercritical carbon dioxide foam insulation

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Embodiment Construction

[0033] The present invention is not limited by the following examples, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions.

[0034] Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:

[0035] as attached figure 1 As shown, first, the nucleating agent with a weight ratio of 4‰ to 7‰, the cell opener of 2% to 5%, the additive additive of 0.8% to 1.5%, and the balance of polystyrene are mixed uniformly to form a solid mixture, Then the solid mixture enters the first extruder, the pressure in the first extruder is controlled between 16Mpa and 18Mpa, the temperature is controlled between 180°C and 200°C, and the solid mixture is gradually changed by the first extruder The mixing screw fully stirs and kneads and gradually turns into a liquid mixture; the supercritical carbon dioxide with a pressure of 16Mpa to 18Mpa and a temperature of...

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Abstract

The invention relates to a method for producing extrusion molding polystyrene polyfoam for heat insulation by supercritical carbon dioxide foaming as well as a gradually-changed mixing-type screw rod and a backpressure mixing-type screw rod thereof. The method comprises the following steps: uniformly mixing a nucleating agent, a hole opening agent, an additive and polystyrene; controlling the pressure between 16 Mpa and 18 Mpa and the temperature between 180 DEG C-200 DEG C of a first extruder; controlling the pressure between 16 Mpa and 10 Mpa and the temperature between 70 DEG C-100 DEG C of a second extruder; controlling the pressure between 7 Mpa and 8 Mpa and the temperature between 50 DEG C-45 DEG C of a die head; and adding supercritical state carbon dioxide with the pressure between 16 Mpa and 18 Mpa and the temperature between 50 DEG C-60 DEG C. The invention realizes environmental-friendly foaming, eliminates the damage to an atmosphere ozone layer by Freon, reduces environmental pollution and also greatly reduces the production cost, and the cost of products per ton is reduced by 4,000 RMB or so; the quality of the extrusion molding polystyrene polyfoam is greatly improved, the flexibitity and the compressive strength of a plate are respectively improved by 20 percent, and the fire resistance is stable.

Description

1. Technical field [0001] The invention relates to the technical field of extruded polystyrene foam for heat insulation, and relates to a production method of extruded polystyrene foam for supercritical carbon dioxide foaming and heat insulation, as well as a gradual mixing screw and a back pressure mixing screw. 2. Background technology [0002] The usual extruded polystyrene foam production process for heat insulation uses freon as a blowing agent. Because freon damages the atmospheric ozone layer, according to the International Montreal Convention, our country also prohibits its use. At present, the extruded polystyrene foam board industry for heat insulation temporarily uses fluorine-containing substitutes R22 and 142B (R22 and 142B are both fluorine-containing compounds, and are currently used to replace Freon for heat insulation extrusion due to their small damage to the ozone layer. Styrofoam foam blowing agent) transition, will be completely banned by 2030. Therefor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/12C08L25/06B29C47/92B29C47/60B29C47/62B29C48/585B29C48/53B29C48/56B29C48/575B29C48/92
CPCB29C47/6068B29C47/6043B29C47/6018B29C47/6062B29C48/92B29C2948/92704B29C48/53B29C48/56B29C48/575B29C48/585B29C2948/92514B29C2948/92895
Inventor 张全刘家全孔令军
Owner 新疆西龙土工新材料股份有限公司
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