Method for functionally remolding waste polystyrene

A technology of waste polystyrene and polystyrene, which is applied in the direction of plastic recycling, recycling technology, etc., can solve the problems of low quality polystyrene, high price, complicated equipment, etc. simple effect

Inactive Publication Date: 2010-05-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although there are many methods for recovering polystyrene, the method for high-grade and high-purity polystyrene that has commercial value is mainly the solvent recovery method. CN00108071.7 discloses a method for recovering polystyrene, but this The method is just to use solvent to carry out simple treatment to make it finalized, and then carry out the recovery method of cutting and granulating. It is difficult to effectively remove the organic impurities of waste polystyrene by using this method, so the quality of recovered polystyrene is low; CN1097196A discloses A regeneration method using recyclable solvents to dissolve waste polystyrene and then perform mechanical granulation, but this method has the disadvantages of long time consumption, complicated equipment, and high energy consumption; CN200510032267.X discloses a recycling method using limonene to recycle waste The method of polystyrene, but this solvent is expensive, does not have industrial value; CN200810058659.7 discloses a kind of recovery method that waste polystyrene is hot-pressed at low temperature, dissolved in a good solvent, and then melted and granulated. The disadvantage is that polystyrene may be decomposed to produce by-products during the low-temperature hot-press solvent and granulation process

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  • Method for functionally remolding waste polystyrene
  • Method for functionally remolding waste polystyrene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] a. Clean and preliminarily process the surface of waste polystyrene foam to make its volume ≤ 1cm 3 block material;

[0017] b. Add it to the chloroform solvent, the waste polystyrene foam will swell and defoam rapidly, continue to add the waste polystyrene foam until it becomes a viscous polystyrene swelling body, and place it at room temperature for 10-15 minutes;

[0018] c. Add the polystyrene swollen body into room temperature water containing sodium dodecylbenzenesulfonate at a concentration of 2.4g / liter, stir at 210rpm, start heating, and heat up at a rate of 0.5°C / min, and stop heating at 65°C Keep at constant temperature for 30 minutes;

[0019] d. Carry out solid-liquid separation by filtration, and the separated solid particles are translucent white granule finished polystyrene after drying, with a particle size of about 1mm;

[0020] e. Soak the solid polystyrene particles in propane for 10 hours to obtain expandable polystyrene particles (EPS).

[0021]...

Embodiment 2

[0023] a. Clean and preliminarily process the surface of waste polystyrene foam to make its volume ≤ 1cm 3 block material;

[0024] b. Add it into ethyl acetate solvent, the waste polystyrene foam will swell and defoam quickly, continue to add waste polystyrene foam until it becomes viscous polystyrene swelling body. Add about 7% of the treated carbon black to the swelling body, and then put it into the sonic cleaner for 15-20 minutes of ultrasonic;

[0025] c. Add the polystyrene swelling body to the normal temperature water containing fatty alcohol polyoxyethylene ether sodium sulfate with a concentration of 2.4g / liter, the stirring speed is 220rpm, start heating, the heating rate is 0.5°C / min, and stop heating when heated to 65°C Keep at constant temperature for 30 minutes;

[0026] d, then carry out solid-liquid separation by filtration. The separated solid particles are dried to become translucent black particles of finished polystyrene, with a particle size of about 1...

Embodiment 3

[0030] a. Clean and preliminarily process the surface of waste polystyrene foam to make its volume ≤ 1cm 3 block material;

[0031] b. Add it to acetone solvent, the waste polystyrene foam will swell and defoam quickly, continue to add waste polystyrene foam until it becomes a viscous polystyrene swelling body, and add about 1.5% of treated polystyrene foam to the swelling body Fe3iron tetroxide, and then put it into a sonic cleaner for ultrasonication for 15 to 20 minutes;

[0032] c. Add the polystyrene swollen body to room temperature water containing polyvinyl alcohol at a concentration of 2.4g / liter, stir at 220rpm, start heating at a heating rate of 0.5°C / min, stop heating at 65°C and keep the temperature constant for 30 minutes;

[0033] d. Carry out solid-liquid separation by filtration, and the separated solid particles are translucent brown granule finished polystyrene after drying, with a particle size of about 1mm;

[0034] e. Soak the solid polystyrene particles...

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Abstract

The invention relates to a method for functionally remolding waste polystyrene. The method includes the following steps of: preprocessing polystyrene foam, adding the preprocessed polystyrene foam to a water-fast organic solvent so as to dissolve the polystyrene foam into a polystyrene swelling body, adding the polystyrene swelling body to water containing a surface active agent, continuously stirring, heating, distilling and carrying out solid-liquid separation to obtain the finished product of polystyrene particle; and soaking the polystyrene particle in a foaming agent to obtain expandable polystyrene (EPS) particles. The used organic solvent is simple and is easy to recycle and reuse. The method not only can functionally remold the waste polystyrene, but also can conveniently prepare an antistatic black polystyrene particle and a magnetic polystyrene particle, overcomes the disadvantages of toxic solvent, high price, impure products, and the like of the traditonal method for functionally remolding the waste polystyrene and effectively solves the problem of environmental pollution caused by the waste polystyrene. The invention has the advantages of simple process of functionally remolding the waste polystyrene, low cost and high purity of product ingredients.

Description

Technical field: [0001] The invention relates to a method for functional remodeling and reuse of discarded chemical raw materials, especially a method for functional remodeling of polystyrene foam as raw material. Background technique: [0002] With the development of the plastic industry, the application of plastic products is becoming more and more extensive. The disposal of plastic waste has become a very difficult problem, and the white pollution it produces has become a global public hazard. Among various plastics, polystyrene (PS) and expanded polystyrene (EPS) are the most widely used. Currently commonly used recycling methods: 1. Recycling styrene monomer, oil and asphalt by thermal decomposition; 2. Recycling polystyrene raw materials by melt extrusion; 3. Directly crushing into granules and adding them to new materials; 4. Recycling by solvent method ; 5 Use waste polystyrene to produce coatings, adhesives and other products. At present, although there are many m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/18C08J11/06C08L25/06
CPCY02W30/62
Inventor 李俊锋张春丰庞桂花罗文化程志强王洪艳
Owner JILIN UNIV
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