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Remodeling method of polystyrene plastic granules

A technology of polystyrene plastic and polystyrene, which is applied in the field of remolding polystyrene plastic particles, can solve the problems of single function, low quality polystyrene, and long time-consuming, etc., and achieve simple processing technology and good flame retardancy Performance, the effect of improving the resistivity

Pending Publication Date: 2021-06-11
陈志益
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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
CN200910217812.0 discloses a method for functionalized remodeling of waste polystyrene, which can not only reshape waste polystyrene, but also facilitate the preparation of antistatic black polystyrene particles and magnetic polystyrene Ethylene granules overcome the shortcomings of the existing waste polystyrene functional remodeling methods, such as toxic solvents, high prices, and impure products.
However, the mechanical properties of polystyrene prepared by the above method are poor, the function is single, and especially the flame retardancy is insufficient, so it is necessary to study a method for remodeling polystyrene plastic particles

Method used

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  • Remodeling method of polystyrene plastic granules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for remodeling polystyrene plastic particles, comprising the following steps:

[0029] a. Remove the dirt adhering to the surface of the pre-remodeled polystyrene foam to make the volume ≤ 1cm 3 block material;

[0030] b. Place the prepared block in a water-insoluble organic solvent to dissolve it into a polystyrene swelling body; the organic solvent is benzene;

[0031] c. Put the polystyrene swelling body in room temperature water containing sodium dodecylbenzenesulfonate with a concentration of 2.8g / L, heat while stirring, control the stirring speed at 250rpm, heat to 75°C, stop heating and keep the constant temperature for 45min. The heating rate is controlled at 0.8°C / min;

[0032] d. Solid-liquid separation is carried out by filtration, and the separated solid particles are dried into translucent white polystyrene particles with a particle size of about 1mm;

[0033] e, then soak the solid polystyrene particles in the foaming agent, and soak for 12 ho...

Embodiment 2

[0050] A method for remodeling polystyrene plastic particles, comprising the following steps:

[0051] a. Remove the dirt adhering to the surface of the pre-remodeled polystyrene foam to make the volume ≤ 1cm 3 block material;

[0052] b. Place the prepared block in a water-insoluble organic solvent to dissolve it into a polystyrene swelling body; the organic solvent is benzene, toluene, xylene or chloroform;

[0053] c. Put the polystyrene swelling body in room temperature water containing sodium dodecylbenzenesulfonate with a concentration of 3.0g / L, heat while stirring, control the stirring speed at 200rpm, heat to 80°C, stop heating and keep the constant temperature for 30min. The heating rate is controlled at 1°C / min;

[0054] d. Solid-liquid separation is carried out by filtration, and the separated solid particles are dried into translucent white polystyrene particles with a particle size of about 1mm;

[0055] e, then soak the solid polystyrene particles in the foam...

Embodiment 3

[0071] A method for remodeling polystyrene plastic particles, comprising the following steps:

[0072] a. Remove the dirt adhering to the surface of the pre-remodeled polystyrene foam to make the volume ≤ 1cm 3 block material;

[0073] b. Place the prepared block in a water-insoluble organic solvent to dissolve it into a polystyrene swelling body; the organic solvent is chloroform;

[0074] c. Put the polystyrene swelling body in room temperature water containing sodium dodecylbenzenesulfonate with a concentration of 2.4g / L, heat while stirring, control the stirring speed at 300rpm, heat to 70°C, stop heating and keep the constant temperature for 50min, The heating rate is controlled at 0.5°C / min;

[0075] d. Solid-liquid separation is carried out by filtration, and the separated solid particles are dried into translucent white polystyrene particles with a particle size of about 1mm;

[0076] e, then soak the solid polystyrene particles in the foaming agent, and soak for 13...

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Abstract

The invention discloses a polystyrene plastic particle remodeling method, which comprises: removing dirt from pre-remodeled polystyrene foam, dissolving the polystyrene foam in an organic solvent, heating the solution in warm water containing sodium dodecyl benzene sulfonate, and carrying out solid-liquid separation to obtain polystyrene granules; then soaking polystyrene granules into a foaming agent to obtain expandable polystyrene granules, mixing a flame retardant, hydrophobic silicon dioxide and an inorganic coating material to obtain slurry, coating the expandable polystyrene granules with the slurry, and curing the material to obtain flame-retardant granules; and finally, treating the flame-retardant granules by adopting a mixed solvent and modified graphene to obtain the polystyrene plastic granules. The remodeled polystyrene plastic granules not only have very good flame retardant property, but also have the advantages of simple treatment process, low cost and high conductivity. Herein, the boron-doped graphene is adopted to replace undoped conventional graphene, so that the resistivity can be effectively improved to two orders of magnitude.

Description

technical field [0001] The invention relates to the technical field of polystyrene plastics, in particular to a method for remolding polystyrene plastic particles. Background technique [0002] As a general-purpose thermoplastic resin, polystyrene has good performance and processability, and has been widely used in various fields of people's production and life. For example, expandable polystyrene is mostly used for heat preservation, heat insulation, shockproof and packaging. Waste expandable polystyrene in my country is an important source of white pollution, and it is in urgent need of recycling and high-value reuse. [0003] 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. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/06C08K9/04C08K3/04C08K9/06C08K3/36C08K9/00C08K3/26C08J9/14C08J9/00
CPCC08J9/141C08J9/009C08J2325/06C08J2203/14C08K9/04C08K3/042C08K9/06C08K3/36C08K9/00C08K3/26
Inventor 胡森川杨曦罗万象陈志益
Owner 陈志益
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