Method for recycling waste plastics containing polybrominated diphenyls and polybrominated diphenyl ethers

A polybrominated diphenyl ether and polybrominated biphenyl technology, which is applied in the field of waste plastic regeneration, can solve the problems of high equipment requirements, unsuitable for large-scale production, and can not solve the problem of plastic waste regeneration well, so as to improve separation efficiency and realize physical circulation. The effect of using

Inactive Publication Date: 2011-05-11
广东泰昊新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems in adopting this patented method to reclaim polybrominated diphenyl ether flame-retardant plastics: (1) decabromodiphenyl ether theoretically still has a solubility of 0.1 to 0.2 wt% in these solvents at room temperature, and the polybrominated diphenyl ethers below nona bromine The solubility is greater, due to the high boiling point and low volatility, most of the dissolved polybrominated diphenyl ethers cannot be removed with the solvent in the subsequent vacuum evaporation process
(2) The particle size of decabromodiphenyl ether raw materials is generally 1 to 5 microns. Experiments have found that the decabromodiphenyl ether particles in waste plastics will also partially dissolve when the plastic dissolves, resulti

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0040] Example 1

[0041] 1kg of waste HIPS (highly resistant polystyrene) particles containing 5% (weight) of decabromodiphenyl ether and 4kg of toluene were added to a 10-liter stirred tank, stirred and dissolved at room temperature for 60 minutes, and the solution was passed through a separating sieve (aperture 0.5mm) separation to obtain 4.9kg of plastic solution and 0.1kg of insoluble plastic particles, screws, glass, grit and other impurities. Pass the plastic solution through a high-speed tubular centrifuge, and separate 0.18 kg of sludge-like residue and 4.72 kg of filter solution at a speed of 10,000 rpm. Add 4 kg of toluene to the filter solution to reduce the concentration of HIPS to 10% Around, heated to 50℃, placed in frequency of 100kHz, power of 0.5W / cm 2 Under the action of the ultrasonic wave, and stir and dissolve at a speed of 500 rpm for 60 minutes, and then add it to the 8kg isopropanol stirred tank preheated to 50 ℃ at a speed of 100 ml / min for precipitation...

Example Embodiment

[0043] Example 2

[0044] 1kg of waste polystyrene (PS) containing 5% of decabromodiphenyl ether and 3% of decabrombiphenyl and 2.3kg of limonene were added to a 10-liter stirred tank, stirred and dissolved at room temperature for 60 minutes, and the solution was passed through a separating screen ( The hole diameter is 1mm), and 3.19kg of polymer solution and about 0.11kg of insoluble plastic particles and impurities such as screws, glass and gravel are obtained. The polymer solution is passed through a high-speed tubular centrifuge at a speed of 15000 rpm to separate 0.25 kg of sludge and 2.94 kg of filtrate, and then 1 kg of limonene is added to the filtrate to control the plastic concentration to about 20% , Heated to 60℃, and at the same time, the frequency is 100kHz / , the power is 0.5w / cm 2 Under the action of the ultrasonic wave, stir and dissolve for 120min at a speed of 1000 revolutions / min, and then add it to an 8kg n-propanol stirred tank preheated to 60℃ at a speed of...

Example Embodiment

[0046] Example 3

[0047] 1kg of waste HIPS containing 10% of decabromodiphenyl ether and 4kg of butyl acetate were added to a 10-liter stirred tank, stirred and dissolved at room temperature for 90 minutes, and the solution was passed through a separating screen (aperture of 0.5mm) to obtain 4.92kg of polymer Solution and 0.08kg of insoluble plastic particles, screws, glass, sand and other impurities. The polymer solution is passed through a high-speed tubular centrifuge at a speed of 10,000 rpm to separate 0.33 kg of sludge-like sludge and 4.59 kg of filtrate. Add 4.5 kg of butyl acetate to the filtrate to reduce the concentration of the plastic Reduce to about 10%, then heat to 50°C, put in frequency 50kHz, power 1.5w / cm 2 Stir and dissolve for 60 minutes under the action of the ultrasonic wave at 500 revolutions / min. Then add 100ml / min to a 9.5kg ethanol stirred tank preheated to 50℃ for precipitation. During the addition, the stirring speed of ethanol is 1000 revolutions / mi...

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Abstract

The invention discloses a method for recycling waste plastics containing polybrominated diphenyls and polybrominated diphenyl ethers, which comprises the following steps: adding waste electronic plastics into a solvent A, dissolving the waste electronic plastics at normal temperature, screening the dissolved plastic solution by using a separating screen, centrifugalizing the screened plastic solution, complementally adding the solvent A into the centrifugalized plastic solution, applying ultrasonic waves onto the solution, adding the obtained plastic solution into a solvent B, and stirring for 30-90 minutes at the rotation speed of 1000-2000 revolutions/minute under the action of ultrasonic waves of which the frequency is 20-50 kHz and the power is 0.5-1.5 W/cm<2>; and sending the plastic precipitate into a twin screw extruder, and removing the residual solvent in the precipitate at 180-220 DEG C, thereby obtaining the recycled plastic product. The mass percent of polybrominated diphenyls and polybrominated diphenyl ethers in the plastics treated by using the method provided by the invention is reduced to lower than 0.1% without great loss of physical and mechanical properties.

Description

technical field [0001] The invention relates to a regeneration method of waste plastics, in particular to the recycling of polybrominated diphenyl ether and polybrominated biphenyl flame-retardant waste plastics, and the method is suitable for the regeneration of flame-retardant waste electronic plastics. Background technique [0002] The dismantling and recycling process of waste electronic and electrical equipment produces a large amount of plastic waste. These plastics are generally added with 5-20% brominated flame retardants. Among them, polybrominated biphenyls and polybrominated diphenyl ethers have been proven to be harmful to the environment, organisms and human beings. Persistent organic pollutants that are harmful to health, so the European Union clearly stipulates in the "Directive on the Restriction of the Use of Certain Hazardous Components in Electrical and Electronic Equipment" (RoHS Directive) that all products sold in the EU market will be effective from Jul...

Claims

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Application Information

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IPC IPC(8): C08J11/08C08L25/06C08L51/04C08L55/02C08L69/00
CPCY02W30/62
Inventor 彭绍洪陈烈强赵向阳
Owner 广东泰昊新材料科技有限公司
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