Because of its characteristics of light weight, shock absorption, low moisture absorption, easy forming, and low price, polystyrene foams are widely used in the packaging of fragile valuables and fast foods such as instruments, household appliances, and handicrafts. Most of these packaging materials are used once, and there is a huge amount of waste. Moreover, because polystyrene has the characteristics of anti-aging, anti-corrosion and the like, it cannot be degraded by itself and disappears, thus causing increasingly serious pollution to the environment.
There have been many reports in the past few years on the recycling of styrofoam, mainly for its production of paints, adhesives, extrusion granulation and cracking recovery of monomer and other methods. In recent years, many people have invested a lot of research and proposed many new ways.
1, production of flame retardants. Some people have washed and dried the recycled polystyrene foam, dissolved it in an organic solvent, and reacted with liquid bromine to obtain a flame retardant brominated polystyrene. Compared with other organic flame retardants, brominated polystyrene does not release dioxin and other carcinogens during the combustion process, and is a good flame retardant. The brominated polystyrene flame retardant prepared by this process can be comparable to the commercial brominated polystyrene flame retardant.
2. Prepare impact plastic. In recent years, polystyrene foam pellets have been successfully prepared by foam recycling units in Beijing and other places, but the recovered pellets are brittle, have a color and transparency much lower than that of general-purpose transparent polystyrene. It is necessary to modify it to improve its performance. Some people use the linear SBS or SBS/CaCO3 compound toughening agent to toughen the recycled polystyrene foam. Experiments have shown that SBS and polystyrene have good compatibility and dispersion. Adding appropriate amounts of these tougheners can not only greatly increase the impact strength of recycled polystyrene, but also improve the blends. Molding performance.
3, production of lightweight building insulation materials. The waste polystyrene foam is broken into crushed particles with a particle size of less than 20mm, and then mixed with cement and expanded perlite powder and evenly laid on the roof for 3 days. After being naturally dried, it is leveled with a cement mortar. In order to make a concrete insulation roof. The roof is in full compliance with JGJ26-95 "Civil Building Energy Efficiency Design Standards". It has the advantages of low cost, good insulation effect, light weight, etc. It not only achieves building energy efficiency, but also achieves the purpose of recycling polystyrene foam. .
4, non-solvent heat medium defoaming recycling process. One of the difficulties in recycling polystyrene foam is that because of its low density, transportation costs account for a large part of the cost of recycling. Liu Yingjun, Zhang Songpei, etc. introduced a new technology for the defoaming recovery with non-solvent heat medium in plastics technology. The process is to put waste polystyrene foam into a defoaming tank, add heat medium heated to a certain temperature, contact it with the foam and fall into the heating tank along with the defoaming shrinkage material, and then The defoamed material can be separated from the media used to obtain a defoamed recyclate. The actual use results show that the process has very significant economic and social benefits.
5. High recovery pyrolysis process. Polystyrene thermal cracking has been studied for many years, and its cracking reaction process has also been reported, including solution degradation, catalytic degradation, metal bath degradation, and tubular reactor degradation. In these studies, the yield of styrene was mostly around 60%. In order to increase the effect of styrene degradation reaction, optimized cracking process parameters were obtained, and the yield of styrene was increased to about 70%.
6, solvent regeneration. CN1080645A is mainly designed for a waste polystyrene instant food box and designed a solvent regeneration process. The process is to dissolve the waste polystyrene foam into organic solvents such as aliphatic hydrocarbons or aromatic hydrocarbons, and the solution is allowed to stand and remove precipitated impurities and then sent to the solution. Into the evaporator, the volatile solvent can be recycled after being condensed and recovered by the condenser, and the remaining polystyrene material can be recovered through extrusion granulation. Because of the large viscosity and poor fluidity of the polymer solution, the volatilization rate of the solvent is relatively slow. The regeneration method developed by Mitsui Shipbuilding Co., Ltd. in Japan uses limonene as a solvent and solves the problem of difficult solvent removal in high-viscosity fluids, and can obtain polystyrene recycled pellets with good properties.
7, physical regeneration. The previous recycling methods all had one common drawback: the raw materials must be clean, otherwise it would bring great difficulties to the preliminary work such as cleaning, sorting, and separation. Some people crushed polystyrene foam into pellets, mixed with binders dissolved in organic solvents, and then remolded at room temperature without solvent, without heating, without the need for raw material cleaning, Sorting and separation are simple, energy-saving and environmentally friendly. With this process, waste polystyrene foam can be prepared into heat-insulating materials and building materials.
There have been many reports in the past few years on the recycling of styrofoam, mainly for its production of paints, adhesives, extrusion granulation and cracking recovery of monomer and other methods. In recent years, many people have invested a lot of research and proposed many new ways.
1, production of flame retardants. Some people have washed and dried the recycled polystyrene foam, dissolved it in an organic solvent, and reacted with liquid bromine to obtain a flame retardant brominated polystyrene. Compared with other organic flame retardants, brominated polystyrene does not release dioxin and other carcinogens during the combustion process, and is a good flame retardant. The brominated polystyrene flame retardant prepared by this process can be comparable to the commercial brominated polystyrene flame retardant.
2. Prepare impact plastic. In recent years, polystyrene foam pellets have been successfully prepared by foam recycling units in Beijing and other places, but the recovered pellets are brittle, have a color and transparency much lower than that of general-purpose transparent polystyrene. It is necessary to modify it to improve its performance. Some people use the linear SBS or SBS/CaCO3 compound toughening agent to toughen the recycled polystyrene foam. Experiments have shown that SBS and polystyrene have good compatibility and dispersion. Adding appropriate amounts of these tougheners can not only greatly increase the impact strength of recycled polystyrene, but also improve the blends. Molding performance.
3, production of lightweight building insulation materials. The waste polystyrene foam is broken into crushed particles with a particle size of less than 20mm, and then mixed with cement and expanded perlite powder and evenly laid on the roof for 3 days. After being naturally dried, it is leveled with a cement mortar. In order to make a concrete insulation roof. The roof is in full compliance with JGJ26-95 "Civil Building Energy Efficiency Design Standards". It has the advantages of low cost, good insulation effect, light weight, etc. It not only achieves building energy efficiency, but also achieves the purpose of recycling polystyrene foam. .
4, non-solvent heat medium defoaming recycling process. One of the difficulties in recycling polystyrene foam is that because of its low density, transportation costs account for a large part of the cost of recycling. Liu Yingjun, Zhang Songpei, etc. introduced a new technology for the defoaming recovery with non-solvent heat medium in plastics technology. The process is to put waste polystyrene foam into a defoaming tank, add heat medium heated to a certain temperature, contact it with the foam and fall into the heating tank along with the defoaming shrinkage material, and then The defoamed material can be separated from the media used to obtain a defoamed recyclate. The actual use results show that the process has very significant economic and social benefits.
5. High recovery pyrolysis process. Polystyrene thermal cracking has been studied for many years, and its cracking reaction process has also been reported, including solution degradation, catalytic degradation, metal bath degradation, and tubular reactor degradation. In these studies, the yield of styrene was mostly around 60%. In order to increase the effect of styrene degradation reaction, optimized cracking process parameters were obtained, and the yield of styrene was increased to about 70%.
6, solvent regeneration. CN1080645A is mainly designed for a waste polystyrene instant food box and designed a solvent regeneration process. The process is to dissolve the waste polystyrene foam into organic solvents such as aliphatic hydrocarbons or aromatic hydrocarbons, and the solution is allowed to stand and remove precipitated impurities and then sent to the solution. Into the evaporator, the volatile solvent can be recycled after being condensed and recovered by the condenser, and the remaining polystyrene material can be recovered through extrusion granulation. Because of the large viscosity and poor fluidity of the polymer solution, the volatilization rate of the solvent is relatively slow. The regeneration method developed by Mitsui Shipbuilding Co., Ltd. in Japan uses limonene as a solvent and solves the problem of difficult solvent removal in high-viscosity fluids, and can obtain polystyrene recycled pellets with good properties.
7, physical regeneration. The previous recycling methods all had one common drawback: the raw materials must be clean, otherwise it would bring great difficulties to the preliminary work such as cleaning, sorting, and separation. Some people crushed polystyrene foam into pellets, mixed with binders dissolved in organic solvents, and then remolded at room temperature without solvent, without heating, without the need for raw material cleaning, Sorting and separation are simple, energy-saving and environmentally friendly. With this process, waste polystyrene foam can be prepared into heat-insulating materials and building materials.
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2.Providing thoughtful innovations and inspirational designs for different kinds faucets.
3.Using high technical equipments and machine to process superior quality faucet and taps
4.Applying with high standard polishing and electroplating surface treatments .
5.Checking in every production processes with modern testing machines to insure the quality.
6.Employing skilled and responsible engineers and workers for faucets design and produce.
7.Establishing the key management team to satisfied the customers all all over the world .
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