Regeneration method of waste plastic containing polybrominated biphenyls and poly brominated diphenyl ethers

A technology of decabromodiphenyl ether and plastics, which is applied in the field of separation and regeneration of bromine-containing flame-retardant styrene-based plastics. Separation is easy to carry out, realizes resource reuse, and the effect of complete separation

Active Publication Date: 2016-01-13
韶关鑫山塑料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Since most brominated flame retardants are difficult to dissolve in organic solvents, the dissolution process has a large diffusion resistance, so directly dissolving and separating brominated flame retardants from plastics has low efficiency and poor debromination effect
[0007] 2. Although the use of pressure and supercritical fluid can improve the solubility, the operating conditions are harsh and not suitable for large-scale industrial applications
[0008] 3. Use solvent to convert solid plastic into plastic solution for regeneration, and eliminate small particles of decabromodiphenyl ether in the solution by adding fresh solvent to achieve the purpose of improving the separation effect, which will cause excessive use of solvent and affect the recovery bad process
[0009] 4. The existing technology cannot distinguish between toxic and non-toxic brominated flame retardants. The separated flame retardants are a mixture of various brominated flame retardants. Since some of the flame retardants are still beneficial to value, further processing is required to Realize its resource utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] During the sorting process, 1kg of bromine-containing flame-retardant plastic waste with a size of 0.1~1cm was added to 4.5kg of toluene, stirred and dissolved in a 10-liter stirred tank at room temperature for 60min, and the solution was separated by a sieve (aperture of 0.1mm) Separate to obtain 5.10 kg of plastic solution and 0.40 kg of insoluble plastic particles with impurities. The analysis found that the solution contained 10.00wt% of HIPS, PS plastic, 1.00wt% of decabromodiphenyl ether, 0.60wt% of decabromodiphenylethane, 0.60wt% of antimony trioxide, 0.20wt% of six Bromocyclododecane, 0.12% polybrominated diphenyl ether (excluding decabromodiphenyl ether).

[0040] The plastic solution is heated to 95°C, the decabromodiphenyl ether particles in the plastic solution are completely dissolved, and 50 grams of antimony trioxide and decabromodiphenyl ethane mixture are obtained by hot filtration with a filter with a pore size of 0.01 mm. At a rate of 5℃ / min, reduce th...

Embodiment 2

[0044] During the sorting process, 1kg of bromine-containing flame-retardant plastic wastes with a size of 0.1~1cm were added to 4.5kg of limonene, stirred and dissolved in a 10-liter stirred tank at room temperature for 60 minutes, and the solution was separated by a sieve (aperture of 0.1mm) After separation, 5.10 kg of plastic solution and 0.40 kg of insoluble plastic particles and impurities are obtained. The analysis found that the solution contained 10.00wt% of HIPS, PS plastic, 1.00wt% of decabromodiphenyl ether, 0.60wt% of decabromodiphenylethane, 0.60wt% of antimony trioxide, 0.20wt% of six Bromocyclododecane, 0.12% polybrominated diphenyl ether (excluding decabromodiphenyl ether).

[0045] The plastic solution is heated to 80°C, the decabromodiphenyl ether particles in the plastic solution are completely dissolved, and 50 grams of antimony trioxide and decabromodiphenyl ethane mixture are obtained by hot filtration with a filter with a pore size of 0.01 mm, and the temp...

Embodiment 3

[0049] Example 1 Take 1kg of bromine-containing flame-retardant ABS plastic and add it to 4.5kg of methyl ethyl ketone, stir and dissolve it in a 10-liter stirred tank at room temperature for 60 minutes, and separate the solution with a separation sieve (aperture of 0.1mm) to obtain 5.00kg of plastic Solution and 0.50kg of insoluble plastic particles and impurities. The analysis found that the solution contained 10.00wt% of ABS plastic, 0.70wt% of tetrabromobisphenol A, 0.30wt% of decabromodiphenyl ether, 0.60wt% of antimony trioxide, and 0.60wt% of decabromodiphenyl Ethane, 0.12% polybrominated diphenyl ether (excluding decabromodiphenyl ether).

[0050] The plastic solution is heated to 60°C, the decabromodiphenyl ether particles in the plastic solution are completely dissolved, and the mixture of antimony trioxide and decabromodiphenyl ethane 55 grams is obtained by hot filtration with a filter with a pore size of 0.01 mm. At a rate of 5°C / min, reduce the solution to 0°C, slo...

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Abstract

The invention relates to a regeneration method of waste plastic containing polybrominated biphenyls and poly brominated diphenyl ethers, and discloses a method for separating and regenerating flame-retardant styrene plastic containing bromine. The method comprises the steps that the waste flame-retardant styrene plastic containing the bromine is added to solvent A, and the styrene plastic of the waste flame-retardant styrene plastic containing the bromine is dissolved; a dissolved plastic solution passes through a screen sieve, an obtained plastic solution is heated, decabromodiphenyl ether is dissolved, and antimonous oxide and the like are removed through heat filtration; the solution obtained through heat filtration is decreased to 0 DEG C; solvent B is added; aging is conducted on the solution at 0 DEG C; small-granule crystals are eliminated; separation is conducted through a centrifuge, and decabromodiphenyl ether granules are obtained; the solution is increased to range from 20 DEG C to 50 DEG C, the solvent B is added, the plastic is precipitated out, and separation of the plastic and toxic flame retardants is achieved; obtained sediments are sent to an extruder, residual solvent in the sediments is removed, and a regenerated plastic product is obtained. According to the regeneration method of the waste plastic containing the polybrominated biphenyls and the poly brominated diphenyl ethers, separation of the toxic brominated flame retardants and non-toxic brominated flame retardants is achieved, and meanwhile the purpose of resource utilization of the waste electronic plastic and brominated flame retardants is achieved.

Description

Technical field [0001] The invention relates to the separation of plastic waste materials, in particular to a method for the separation and regeneration of bromine-containing flame-retardant styrene plastics; in particular, it relates to the regeneration of polystyrene from bromine-containing flame-retardant styrene plastics produced by sorting Styrenic plastics such as ethylene (PS), high impact polystyrene (HIPS), styrene-butadiene-acrylonitrile (ABS), etc., at the same time realize the combination of toxic brominated flame retardants and non-toxic brominated flame retardants Separate. Background technique [0002] The dismantling of waste electronic and electrical equipment produces a large amount of flame-retardant plastic waste. At present, density separation, x-fluorescence spectrum recognition and other technologies are used to sort them into bromine-containing and non-bromine-containing waste plastics, and bromine-free plastics can be used Recycling technology of ordinar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/08C08L25/04C08L25/06C08L51/04C08L55/02
CPCY02W30/62
Inventor 张木娣陈永芳彭绍洪
Owner 韶关鑫山塑料有限公司
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