What is the plastic：
Plastic for the synthesis of macromolecular polymer (polymer) , which also can be called a polymer or macromolecules (macromolecules), and is generally known as the plastic (plastics) or resin (resin), are free to change form style. Raw materials in synthesis or condensation reaction is the use of monomer polymerization material, by the synthetic resin and packing, plasticizer, stabilizer, lubricants, pigment consisting of additive.
Plastic resin is the main ingredient. Resin the term was originally named by lipid secretion produced by the plants and animals, such as rosin, such as shellac, resin refers to the polymer has not been mixed with various additives. Plastic resin accounts for about 40% ~ 100% of the total weight. The basic performance mainly depends on the resin's nature of plastic, but the additive also plays an important role. Some plastics are basically composed of synthetic resin, less or no additives, such as acrylic, polystyrene, etc. So-called plastic, actually it is one of the synthetic resin, similar shape with the natural resin of pine resin, synthetic but because through chemical method, and is called "plastic.
The advantages of plastic：
1. Most of the plastic corrosion resistance is strong, does not react with acid, alkali.
2. Plastic manufacturing cost is low.
3. Durable, waterproof, light.
4. Easy to be with molding into different shapes.
5. Is a good insulator.
6. Plastic can be used for the preparation of fuel oil and fuel gas, so that we can reduce oil consumption.
The disadvantages of plastic：
1. Recycling waste plastic, classification is very difficult, and economic not worthwhile.
2. The plastic is easy to burn and produce poisonous gas when burning. Polystyrene combustion generated when toluene, for example, will this matter a small amount of lead to blindness, suction have the symptom such as vomiting, PVC combustion will produce toxic hydrogen chloride gas, in addition to burning, is the environment of high temperature, can lead to plastic decomposition of toxic components, such as benzene.
3. The plastic is made from petroleum refining products, oil resources are limited.
4. Plastic is buried in the ground hundreds, thousands or even tens of thousands of years, also does not decay.
5. Plastic poor heat resistance, etc, easy to aging.
Due to unable to natural degradation plastics, it has become the no. 1 enemy of mankind, also has led to the tragedy of many animals die. Monkeys at the zoo, for example, pelicans, animals such as dolphins, will ingest visitors with throw bottles 1, finally because without digesting and painful way to die; Looks beautiful pure surface, approached the see, really gone with the wind, crammed with all sorts of unable to oceans contain plastic, more than in the Dead Sea birds samples of intestines, discovered all sorts of plastic cannot be digested.
Plastic packaging materials with light weight, good strength, impact resistance and transparency, moistureproof, beautiful, stable chemical performance, good toughness and corrosion resistance, etc, in the packaging field widely replaced metal, wood, paper, glass, leather, etc., as a result, the plastic packaging to reduce the pressure of resources in our country, the energy plays an irreplaceable role. Plastic packaging materials, however, has a fatal weakness, namely its natural degradation time is long, some 100 years. Plastic not easy degradability, leading to its wastes exist for a long time. And tend to consume a discarded, so the plastic packaging waste become an increasingly prominent environmental problems, formed the so-called "white pollution", for the human environment caused great pressure, therefore, of plastic packaging waste recycling is imminent.
How to reduce the harm of plastic：（Recovery and utilization）
The recycling of waste plastic can produce economic benefits and social effect.
A.Save energy content of waste plastics in municipal solid waste is the highest it mostly from oil but it is in the process of manufacturing lot of energy consumption accounts for about 83% ~ 94% of total process occupy larger proportion. Let it per kilogram of plastic contains less energy of 17.8 MJ how 100 ~ 108.6 MJ discarded waste plastic is abandoned and the practical value of the energy. When the waste plastic recycling to make all kinds of renewable products, such as general packaging material can save 85% ~ 94% of its energy saves oil raw materials used in the manufacture of resins and resin manufacturing energy consumption so the recycling of waste plastics are worth it.burning waste plastics can be recycled energy, of course, but not as efficient as those made from recycled products. Another and and big demand insufficient plastic raw materials for the above conditions waste plastic recycle material can be used as a secondary source.
B.To reduce or reduce the harm done by the waste plastic products although plastic has brought enormous material wealth to mankind the advent of but the emergence of large amounts of waste and to put forward a great challenge. "White pollution" gradually affect human beautiful environment hamper the human security caused serious pollution.
1. environment the waste plastic increase gradually pile up garbage non-perishable places and point pollution is increasing.
2. burning waste plastic garbage can gain some energy but it will produce large amounts of carbon dioxide and hydrogen cyanide. Harmful material such as furan compounds still can cause acid rain, greenhouse effect, etc improper handling can cause secondary pollution to the nature environment.
3. waste plastic into the soil unfavorable decomposition it will prevent soil venting capability of soil deteriorate affect crop growth.
4. waste plastic drifting to the rivers ocean on the other hand affects the ship sailing fish swallow plastic on the other hand will death together the remaining waste plastic Marine for river ships sailing brings security hidden danger.
5. from the aesthetic point of view large amounts of waste plastic will destroy the city community cultural landscape arbitrarily dismissed directly affect the community economic development and investment of city development.
C.Limit the rise in oil prices raise oil prices of waste plastic recycling is a driving force. The price of plastic raw materials rise with the rise in oil prices. New plastic products price is recycling renewable products price much higher meets the requirement conditions of renewable products its price advantage of the potential is considerable.
D.Waste plastic recycling products is economically convenient using waste plastics can be made into a certain quality of recycled products though performance of new products less color appearance to de-escalate but the prices are much lower than those of the new products and renewable products in some departments such as agriculture is very important area of construction and industrial use is not a problem.
E.Waste plastic composite.
1.Fuel,the high heat value on account of the waste plastic material made of the fuel is also valuable. What cleaning separation treatment is no recycling of mixed waste plastics can be burned in the incinerator recycling its divergence of heat energy. It can produce heat uniform solid fuel also could be liquefied into oil again made into liquid fuel but used to burning chlorinity of which should be controlled below 0.4%. Common method is to old and broken into powder or powder in harmonic into slurry as fuel this fuel has high flammable calorific value low gray scale after burning.
2.Made of multi-function resin adhesive available waste plastics in the production of multi-function resin glue, wood glue, printing rubber such as PS dissolved in benzene or other homologue and halogenated organic solvent series can be made into multiple coating and adhesive preparation craft wash crushing, drying PS foam dissolved in xylene or toluene - the mixture of petrol. If join thickening agent can be made into waste water, such as new waterproof coating and adhesive this technology worth doing the coating is suitable for concrete and paper products will glue the waterproof coating.
3.Anti-seepage leakproof agent it mainly in the waste plastic foam as a raw material configuration a small amount of plasticizer its plasticizing was produced by hot melt technology fast dry quickly has good sealing adhesion acidproof alkali anti-aging cost low benefits well and its waterproof and considerably more than plastic anticorrosive grease and oil of asphalt service life can reach more than 20 years.
4.Rust inhibitor use recycled plastic production with embroidered rust inhibitor low-cost can be directly coated embellish and penetration rust corrosion protection of steel surface can also be applied to civilian furniture surface paint.
