In the process of modernization of human society, data plays a vital role. As the three major materials used in human civilization and society: metals, inorganic non-metals, and organic composite materials (including polymer materials), it has laid a solid material foundation for the advancement of human society and the improvement of people's living standards. Polymer materials are a new subject and development point in material science. This important branch of science has opened up a new field of chemical research in the 20th century, and provided new ways and new ideas for the development and enrichment of artificial substances. Recalling the development history of polymer science, it is not difficult to see that a new polymer material is presented every 5-10 years, and a new polymer industry is born every 10-20 years, which fully reflects the strong strength of this discipline. Vitality and vitality. Polymer materials are undoubtedly a successful model in the development of chemical science, and a milestone with epoch-making significance in the development of material science. The appearance of polymer materials has changed the tradition that the material life of human society has always relied on natural rewards for millions of years, and has completed the combination and manufacture of artificial substances with different layouts and functions according to human perseverance and needs. It presents the material civilization that has changed the 20th century and promoted the progress of human society. Today's polymer materials (resin, rubber, and fiber) together with steel, cement, and wood constitute the four basic materials in modern civilization, and become information, energy, industry, agriculture, transportation, and even aerospace and oceans. Data that are indispensable in various important areas of the national economy, such as development, penetrate into all aspects of human life. Let's talk about the position and effect of plastic in the development of human civilization and society. PET film

1. The use of plastics in agriculture

China is a developing agricultural country and a country with relatively scarce water and soil resources. In China's 9.6 million square kilometers of land, the arable land area is only 10%, which is 1/2 of the international per capita arable land area; China is also a water-poor country, and the per capita water resources are only 1/1 of the international per capita level. 4. It is listed as one of the 13 countries with the poorest water in the world. In the past 30 years, under the great attention and promotion of the Chinese government, equipment agriculture and water-saving irrigation have been in the ascendant, and water and soil resources have been reasonably maintained and used, during which plastics have played a vital role. The shed film, mulch film, sunshade net, insect-proof net, turnover box, tray, seedling device, silage film, etc. used in equipment agriculture; Irrigation pipes, drip irrigation pipes, etc. are all made of polyethylene, polypropylene, polyvinyl chloride, EVA and other materials. The use of agricultural plastics shortens the growth cycle of crops, improves the output value of crops and the utilization rate of land, saves water and soil resources, and is of great significance to ensuring China's food security. PET release film

Second, the use of plastics in the field of construction

The area of newly built dwellings in towns and villages in China increased from 92 million square meters in 1980, 170 million square meters in 1990, 549 million square meters in 2000, and 821 million square meters in 2009. In the past 30 years, it has increased by more than 8 times, and the area of newly built houses in China has accounted for 50% of the international total. China's forest area only accounts for 4.6% of the world's. The per capita forest area is less than 1/4 of the international average level, ranking 134th in the world, but the current excessive logging of wood is still quite serious. In order to alleviate the shortage of wood, the contribution of plastics has contributed greatly to the development of the construction field. In doors and windows, because of the use of PVC doors and windows, its air tightness, water tightness, sound insulation, heat insulation, weather resistance, corrosion resistance, stiffness, decoration, application and repairability are better than ordinary steel and aluminum alloy doors and windows. , 30% to 50% energy saving, the current annual market demand for plastic doors and windows in China is 1.5 million tons. Plastic profiles have the advantages of light weight, corrosion resistance, pressure resistance, weather resistance, good water fluidity, easy processing equipment, and long service life. Following the pace of China's continuous acceleration of modern urban construction, it has strengthened the disposal of sewage resources. , In the construction of heating, water and gas supply systems, the domestic demand for plastic pipes in the market is increasing at an annual rate of more than 12%. In 2010, the output value of China's plastic pipes reached 4.5 million tons. By 2015, it will reach 6 million tons, and China will become the country with the largest amount of plastic pipes in the world. It can be seen that the weight of plastics in the national economic construction. Clear PET

Third, the application of plastics in the field of automobiles

China's automobile industry is an important pillar industry of the national economy. Because of its low cost and high efficiency in the processing and molding process, plastics can be recycled and reused after use. In-process resource-saving and environmentally friendly documentation. Automotive plastics cover PP, PVC, ABS, PA, PC, PE, etc. The largest type of PP is increasing at an annual rate of 2.2% to 2.8%. The use of plastics to manufacture automotive parts instead of metal and alloy material parts not only makes The exterior design of automobiles is more user-friendly and diversified, improving safety, comfort and viewing, facilitating installation and repair, and more importantly, reducing vehicle weight, fuel consumption and hydrocarbon emissions. For every 125kg lighter in the car, every liter of fuel can travel an extra kilometer. A 1% reduction in the weight of a car can save 1% of fuel, and a 1% reduction in the moving parts of a car can save 2% of fuel. Internationally, the amount of plastic used in automobiles has become an important symbol to measure the development level of a country's automobiles. Currently, the amount of plastic used in European luxury cars reaches 150-250 kg/car, while the amount of plastic in national brand cars is only 80-100 kg/car. vehicles, but at an alarming rate. According to the American Average Fuel Economy (CAFE) evaluation: for every 10% reduction in the weight of the car, the fuel consumption can be reduced by 6% to 8%. Plastics are gradually becoming the best material for vehicle lightweighting.

Fourth, the application of plastics in medical and food packaging

In 2009, China's pharmaceutical plastic products consumption amounted to 13.5 billion yuan, and the specific consumption share was 22% for low-density polyethylene, 20% for polyvinyl chloride, 20% for polystyrene, 12% for high-density polyethylene, and 10% for polypropylene. We can use ultra-high molecular weight polyethylene to manufacture artificial hip joints, bone nails, etc.; use polytetrafluoroethylene to manufacture artificial hearts, lungs, blood vessels, cardiac membranes, various control organs and artificial skin; Propylene, non-toxic polyvinyl chloride, etc. are used to manufacture syringes, blood transfusion bags, etc.; ABS can be used to manufacture surgical tools and outer casings of diagnostic instruments.

The amount of plastic used for food packaging accounts for 25% of the total output value of plastics. Among them, PET and PEN bottles are mainly used for beverage packaging, and oriented polypropylene film and polyvinylidene chloride film are mainly used for food packaging. There are also polystyrene foam lunch boxes that will be lifted on May 1, 2013. white PET

Talking about the use of plastic is really beautiful. But as we all know, the use of plastic is a double-edged sword, which can benefit mankind and consume resources. For plastics, oil is currently the main raw material, and production processes using natural gas and coal as raw materials are also being studied and developed. However, from an international perspective, the development period of oil, natural gas and coal is only 40 years, 60 years and 225 years, therefore, plastics should be used where they are most needed, use their strengths, learn from each other, make the best use of everything, and recycle. We advocate a conservation-minded society, and let the huge scientific invention of plastic continue to benefit society and future generations.