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Method for producing polystyrene extruded sheets by using carbon dioxide foaming agent

A technology of polystyrene and carbon dioxide, which is applied in a field especially involving the use of carbon dioxide, a production of polystyrene foam extruded board, which can solve the problems of polystyrene extruded board restrictions and other issues

Inactive Publication Date: 2011-08-24
南京法宁格节能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the future, the use of Freon series as a blowing agent to produce extruded polystyrene board (XPS) will be severely restricted

Method used

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  • Method for producing polystyrene extruded sheets by using carbon dioxide foaming agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] When the foaming agent other than carbon dioxide is azodicarbonamide (AC) solid chemical foaming agent, mix 100Kg of polystyrene particles with 1Kg of azodicarbonamide (AC), 2.5Kg of processing aid talcum powder, yellow 0.5 Kg of parent material is fully mixed in the mixer, directly added to the hopper of the extruder through the feeder, and heated by the No. 1 extruder to raise the temperature to above 180°C for polystyrene, so that the polystyrene material is melted and mixed , to form a polymer melt, inject 3Kg of carbon dioxide foaming agent into the polymer melt at the middle position along the direction of the screw extruder path, form a foamable gel, and increase the temperature by adjusting the No. 1 extruder High system pressure, the pressure is 8 ~ 15MPa, the blowing agent is mixed with the polystyrene melt, this pressure is enough to prevent the formed plastic gel from actually foaming or enough to prevent the blowing agent in the foamable gel from losing unif...

Embodiment 2

[0023] When the foaming agent other than carbon dioxide is sodium bicarbonate and citric acid solid chemical foaming agent, polystyrene particles 100Kg, sodium bicarbonate 1Kg, citric acid 0.5Kg, talcum powder 1Kg, cyclohexabromododecane 0.5Kg is fully mixed in the mixer, directly added to the hopper of the extruder through the feeder, and heated by the No. 1 extruder to raise the temperature to above 180°C for polystyrene, so that the polystyrene material is melted and mixed. To form a polymer melt, inject 1Kg of carbon dioxide foaming agent into the polymer melt at the middle position along the path of the screw extruder to form a foamable gel, and increase the temperature by adjusting the No. 1 extruder System pressure, the pressure is 8 ~ 15MPa, the foaming agent is mixed with the polystyrene melt, this pressure is enough to prevent the formed plastic gel from actually foaming or enough to prevent the foaming agent in the foamable gel from losing uniformity dispersion. Af...

Embodiment 3

[0025] When the foaming agent other than carbon dioxide is ethanol liquid physical foaming agent, 100Kg of polystyrene particles, 0.5Kg of cyclohexabromododecane, and 0.5Kg of blue mother are fully mixed in the mixer, and then passed through the feeding machine. Add it directly into the hopper of the extruder, heat it through the No. 1 extruder to raise the temperature to above 180°C for polystyrene, melt and mix the polystyrene material to form a polymer melt, mix 1Kg of ethanol with 2.5Kg of carbon dioxide , at the middle position along the path of the screw extruder, inject it into the polymer melt to form a foamable gel, and increase the system pressure by adjusting the No. 1 extruder, the pressure is 8-15MPa, and the The blowing agent is mixed with the polystyrene melt at a pressure sufficient to prevent the resulting plastic gel from actually foaming or to prevent loss of uniform dispersion of the blowing agent within the foamable gel. After the No. 2 extruder and static...

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PUM

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Abstract

The invention discloses a method for producing polystyrene extruded sheets by using a carbon dioxide foaming agent, which relates to a method for producing polystyrene extruded sheets. In the method, a polystyrene melt is used as a main ingredient, carbon dioxide is used as a main foaming agent, and a polymer melt of at least one of other foaming agents is used. The method comprises: mixing polystyrene particles and a processing assistant in a stirring and loading machine, feeding the mixture into a feed hopper of a first extruder, and heating in the first extruder to melt and mix the polystyrene material to obtain a polymer melt; mixing carbon dioxide with other foaming agents, and injecting the mixture into the melt from the middle section of the first extruder by using a foaming agent injection system to obtain foamable gel; raising the pressure of the system by regulating the first extruder to mixing the foaming agents and the polystyrene melt; and mixing and cooling in a second extruder and a static mixer to reduce the temperature of the gel to an optimal foaming temperature, and extruding the cooled gel through a mold to obtain the polystyrene extruded sheets.

Description

technical field [0001] The present invention uses a carbon dioxide foaming agent to produce polystyrene extruded board method relates to a method of producing polystyrene foam extruded board, especially in the absence of Freon series foaming agent, by using one or more other The foaming agent improves the appearance and performance of the obtained extruded polystyrene board, and the method for producing extruded polystyrene board (XPS). More particularly it relates to a process for the production of extruded polystyrene board (XPS) using carbon dioxide as the primary blowing agent. Background technique [0002] At present, in the conventional production of extruded polystyrene board (XPS) by extrusion process, Freon (CFC, HCFC, HFC, etc.) is commonly used, such as HCFC-142b (1-chloro-1,1-difluoroethane) , HCFC-22 (one chlorodifluoromethane), this kind of foaming agent has a relatively serious damage to the ozone layer, and is also a strong greenhouse gas, which has a certai...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08J9/14C08J9/06C08J9/10C08J9/08C08L25/06B29C47/00
Inventor 郭鑫齐杜小刚
Owner 南京法宁格节能科技股份有限公司
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