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EPS foam recycling in China

Writer：admin Source：Zhongji Date：2011-7-21 16:06:44 Click： Label：EPS foam recycling
Introduction：Recycling is environmentally sound of the most important measures, recycling is also known
Recycling is environmentally sound of the most important measures, recycling is also known as recycling technology. At present, many domestic and foreign scientific research units of

the EPS recycling research, some of them have reached the practical level, the following pairs have reached the practical level of EPS recovery of several technical methods to be

described separately.

1, mechanical recycling

This method can be divided into simple and complex regeneration of two kinds of regeneration, simple and mainly recycled scrap materials used to produce plants, but also

easy to clean one-time use of recycled waste, its composition is relatively simple, clean,renewable materials, individually or in blending a certain percentage of the use of a new

compound, but also can use the existing technology and equipment, which is the main use and proven methods.

1, recovery of production XPS

EPS waste created by the crushed material, the obtained PS, and then melt by adding foaming agent, flame retardants, nucleating agent additive, obtained by the processing of

XPS, is widely used in building materials. Currently, the recycling technology in China has been large-scale promotion, EPS, and has become one of the main ways of recycling.

2, recycling

Foam manufacturers and substandard products may be bits and pieces through the crusher into a certain size of particles, with fresh pre-made beads mixed in the sheet metal

forming machine or packaging machine again in shape, made of various sizes and shapes of the EPS products. After production practice proved that the product performance to meet the

national standard GBl0801-2002 under the premise of the ash particles can be broken 10% ~25%, and that is, you can save raw materials, 10% ~ 25%.

3, hot-melt regeneration

Regeneration points following hot-melt process. A process is to waste EPS foam at 140 �� ~ 190 �� under constant temperature baking, so that contraction deaeration, cooling

after the smash. Baking time will produce flammable gases, the exhaust needed to take effective measures to pay attention to production safety. Another technique for the first

broken bits and pieces, and then screw propeller force added to the crushed foam extruder screw barrel in after melt extrusion, brace, cooling, pelletizing into recycled pellets.

There is also a waste EPS foam process is first immersed into the mixture of high boiling point solvents, antifoaming make it and become a gel material, and then with the modified

resin, additives mixed by the multi-stage exhaust extrusion granulator, while condensing solvent recovery. To enhance the granulation product obtained polystyrene, can be made

stationery, toys and a variety of daily necessities and electrical and electronic components. Using gel-based method of pellets made by air-dry to the solvent content of up

to 6% ~ l0%, they could still re-used to make polystyrene foam plastic products.

Second, production of light-weight thermal insulation material

After the foam has been crushed waste, through infrared radiation heating, the volume reduced to 1 / 20 below; and then mixed with a special cement, fabricated Mihua Tang-like

building materials, has been identified as non-flammable building materials. This silencing effect of building materials on average 60%, for certain frequency noise suppression can be

achieved over 90%. This material has now been used for a variety of insulated walls and ceilings.

In addition, EPS can also be made of lightweight material crushing block, interior and exterior insulation mortar and light mortar. Adhesive can also be broken soil and EPS more

than expected according to a certain side of mixing baking at a high temperature burn, EPS expected to be broken and thus burning a hollow structure made of clay brick, this brick

has a high strength and excellent insulation properties.

3, chemical recycling

Chemical recycling EPS and the environment, as to reconcile the feasibility of methods has been hampered by the attention that the method is to scrap EPS broken down into

monomers, compounds, fuel and other reusable elements, and thus truly become a closed-loop process of EPS recycling. Compared with the mechanical recovery of the method has the

following advantages: the chemical decomposition of the quality of raw materials can be comparable with the new material; In addition it has the potential of a large number of

disposal of waste, namely, to achieve recycling and is able to really control the pollution of the environment EPS . Current chemical recycling has the potential for industrial

process is the pyrolysis, gasification, hydrogenation, pyrolysis. Chemical reaction mechanism in terms of recovery although not new, but it all into practical use, there are

still many engineering problems to be resolved


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