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Method for recycling waste verelite sponge plastics

A waste polystyrene and foamed plastic technology, applied in the direction of plastic recycling and recycling technology, can solve the problems of complex operation process, volatile, flammable and explosive, etc., and achieve the effect of simple equipment and low cost

Inactive Publication Date: 2008-04-02
SHENZHEN FEIYANG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The used solvent of polystyrene foam plastic (EPS) reclaiming by solvent method at present is generally acetone, ethyl acetate, dimethylbenzene, chlorobenzene, halogenated hydrocarbon etc., utilize these solvents to reclaim EPS and mainly there are two big problems: one, because The selected solvent has a low boiling point and is volatile, so it is flammable and explosive, and there are potential safety hazards; secondly, the solvent used is generally more toxic and has an impact on human health
Its operation process is complicated, and there is also the problem of using low boiling point solvents for processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Remove heavier impurities such as metals, stones, gravel, etc. in the waste EPS by wind blowing, and after simple crushing, pass through a sieve with a hole diameter of 80 mm to obtain 350 grams of clean EPS, and dissolve the EPS to 900 In the reactor of gram NME (produced by our company), stir under normal temperature and pressure to dissolve, add 100 grams of silica gel after dissolving, stir evenly again, then leave for 12 hours. After the decolorization was completed, the material was filtered to obtain 1235 grams of filtrate. Add 1400 grams of water to the filtrate, after adding water, stratification occurs, the lower layer is NME, and the upper layer is water and styrene resin. First, NME is separated, and the styrene resin and water are separated from the water and the styrene resin through a filter press device. After the filter cake is dried, it is pulverized and granulated to obtain 325 grams of off-white polystyrene resin. The moisture in the dimethyl nylona...

Embodiment 2

[0027] Remove heavier impurities such as metals, stones, gravel, etc. in waste EPS by wind blowing. After simple crushing, pass through a sieve with a hole diameter of 80 mm to obtain 300 grams of clean EPS. Dissolve the EPS to 900 In the reaction kettle of gram NME (produced by our company), stir under normal temperature and pressure to dissolve, add 120 grams of diatomaceous earth after dissolving, stir evenly again, then place 18 hours. After the decolorization was completed, the material was filtered to obtain 1185 grams of filtrate. Add 1000 grams of water to the filtrate, after adding water, stratification occurs, the lower layer is NME, and the upper layer is water and styrene resin. First NME is separated, and the styrene resin and water are separated from the water and the styrene resin through a filter press device, and the filter cake is dried, pulverized, and granulated to obtain 295 grams of off-white polystyrene resin. The moisture in the dimethyl nylonate can b...

Embodiment 3

[0029] Remove heavy impurities such as metals, stones, gravel, etc. in the waste EPS by wind blowing, and after simple crushing, pass through a sieve with a hole diameter of 80mm to obtain 300 grams of clean EPS, and dissolve EPS to contain 900 grams In the reaction kettle of NME (produced by our company), stir under normal temperature and pressure to dissolve, add 50 grams of activated carbon after the dissolution is completed, stir evenly, and then place it for 24 hours. After the decolorization was completed, the material was filtered to obtain 1185 grams of filtrate. Add 800 grams of water to the filtrate, after adding water, stratification occurs, the lower layer is NME, and the upper layer is water and styrene resin. First NME is separated, and the styrene resin and water are separated from the water and the styrene resin through a filter press device, and the filter cake is dried, pulverized, and granulated to obtain 296 grams of off-white polystyrene resin. The moistu...

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PUM

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Abstract

The present invention discloses a method of using solvent to recycle waste polystyrene foam. A method of recycling waste polystyrene foam comprises: the impurities in the waste polystyrene foam is eliminated; the waste polystyrene foam is crushed and screened through a screen net of a hole-diameter of 50mm to 80mm; the waste polystyrene foam screened in the step (1) is added into nylon acidic dimethyl. The dissolution solution can be prepared after the stirring the polystyrene foam at the room temperature and under the normal pressure to completely dissolve the polystyrene foam. Then water of 70 percent to 150 percent of the total weight is added into the dissolution solution for delamination; the nylon acidic dimethyl and polystyrene resin are separated. The separated polystyrene resin is then dried, crushed, and granulated. The present invention has the simple method, the secure and environmentally protective process, and is suitable for industrialized large-scale application.

Description

technical field [0001] The invention relates to a method for recycling waste polystyrene foam plastics, in particular to a method for recycling waste polystyrene foam plastics with a solvent. Background technique [0002] Polystyrene foam (Expanded Polystyrene, referred to as EPS) is widely used in packaging, heat preservation, It is one of the most widely used plastics in the world today in the fields of waterproof, heat insulation, shock absorption, etc. At present, most of the fast food utensils used in our country are polystyrene foam fast food utensils. A large number of discarded foam plastic fast food utensils are scattered along the traffic, rivers and lakes, tourist attractions, streets and alleys, forming the well-known "white pollution". Because polystyrene has the characteristics of anti-aging and anti-corrosion, it is not easy to rot in nature, and it is not easy to be degraded by microorganisms. Even if it is buried deeply, it will pollute groundwater sources,...

Claims

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Application Information

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IPC IPC(8): C08J11/18C08F112/08
CPCY02W30/62
Inventor 卢亭枫肖增钧
Owner SHENZHEN FEIYANG IND CO LTD
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