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Recovery method of physical foaming agent

A technology of physical foaming agent and recycling method, applied in plastic recycling, recycling technology, mechanical material recycling, etc., can solve the problem of low foaming agent recovery rate, and achieve the effect of reducing overflow, high recycling rate and reducing damage

Inactive Publication Date: 2010-12-01
CHINA ELECTRONICS ENG DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for recovering foaming agent, which is used to solve the problem of low recovery rate of foaming agent in the foam material existing in the prior art

Method used

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  • Recovery method of physical foaming agent
  • Recovery method of physical foaming agent
  • Recovery method of physical foaming agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 100 kg of polyurethane foam containing 5% by weight of CFC-11 as blowing agent was charged into the closed apparatus at room temperature (25°C). Then use a fan to make the inside of the airtight device be in a negative pressure state of 10kPa. Pulverize the polyurethane foam under the above-mentioned negative pressure until the average particle size of the foam reaches 2mm, and then keep it at room temperature until the cooling recovery rate is less than or equal to 1ml / min. The released foaming agent enters the refrigerator connected to the closed device through the pipeline under the action of negative pressure. The cooling temperature of the refrigerator is 10°C. After the foaming agent is liquefied, it is injected into the CFC-11 storage tank by the pressure pump at a pressure of 1000kPa. middle. The recovery amount of CFC-11 is 4.5kg, and the recovery rate is 90%.

Embodiment 2

[0022] 100 kg of polyurethane foam containing 5% by weight of CFC-11 as blowing agent was charged into the closed apparatus. Then use a fan to make the inside of the airtight device be in a negative pressure state of 10kPa. Heat the closed apparatus to 40°C. Pulverize the polyurethane foam in this state until the average particle diameter of the foam reaches 2mm, and then keep it at this temperature until the cooling recovery rate is less than or equal to 0.5ml / min. The released foaming agent enters the refrigerator connected to the closed device through the pipeline under the action of negative pressure. The cooling temperature of the refrigerator is 10°C. After the foaming agent is liquefied, it is injected into the CFC-11 storage tank by the pressure pump at a pressure of 1000kPa. middle. The recovery amount of CFC-11 is 4.65kg, and the recovery rate is 93%.

Embodiment 3～7、 comparative example 1

[0024] Except having pulverized the polyurethane foam at the temperature shown in Table 1, it carried out similarly to Example 2. Table 1 shows the recovery amount and recovery rate of CFC-11.

[0025] Table 1

[0026]

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PUM

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Abstract

The invention relates to a recovery method of a physical foaming agent. The recovery method comprises the following steps of: crushing a material containing the physical foaming agent in a closed or / and negative pressure state until the average grain size is smaller than 2 mm; and cooling and recovering the released physical foaming agent. The recovery method is easier to release the foaming agent in the foaming material without leakage so that the foaming agent is high in recovery rate and scarcely overflows in case of recovery and further lessens injury to the environment or the body health of human beings.

Description

technical field [0001] The present invention relates to a recovery method of physical blowing agent. Background technique [0002] The physical foaming agent forms foam pores through the change of the physical form of a certain substance, that is, the expansion of compressed gas, the volatilization of liquid or the dissolution of solid. Commonly used physical blowing agents are low-boiling alkanes and chlorofluorocarbons. Specifically including n-pentane, n-hexane, n-heptane, petroleum ether, trichlorofluoromethane (abbreviated as CFC-11), dichlorodifluoromethane (abbreviated as CFC-12), dichlorotetrafluoroethane (abbreviated as CFC-12), 114) etc. Materials using these blowing agents will generate a large amount of volatile organic compounds (VOCs) when they are recycled or discarded, and even generate a large amount of CFCs (chlorofluorocarbons) that cause global warming and ozone layer damage. For example, most of the polyurethane foams widely used in waste refrigerator...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B17/04C08L75/04C08J9/14
CPCY02W30/52Y02W30/62
Inventor 穆京祥陈利韩业斌廉启合杨敬增丁涛
Owner CHINA ELECTRONICS ENG DESIGN INST