Plastic pipes are widely used in water supply and drainage engineering, power and communication engineering, gas transmission engineering, agricultural irrigation engineering, industrial production and other fields in cities and buildings. In recent years, with the increase in infrastructure demand brought about by the advancement of my country's urbanization process and the expansion of the application of plastic pipes, the output of plastic pipes across the country has achieved rapid growth.
Between 2011 and 2018, my country's plastic pipe production increased from 10 million tons to 15.67 million tons, with an average annual growth rate of 6.63%. Public information shows that the overall production capacity of domestic plastic pipes has exceeded 30 million tons. There are more than 3,000 large-scale production companies in the industry, of which there are only less than 30 companies with an annual production capacity of more than 300,000 tons. Accounted for relatively small.
At present, the market share of plastic pipes in all types of pipes in the country exceeds 50%. Among them, the output of PVC pipes is the leading product, accounting for about half of the total output of plastic pipes; the output of PE pipes and PP pipes is relatively small, the output of PE accounts for about 30% of the total output of plastic pipes, and the output of PP pipes accounts for about 10% of the total output of plastic pipes. .
Rigid polyvinyl chloride (PVC-U) water supply and drainage pipes are the best-developed plastic pipe varieties in my country. The product uses PVC resin as the main raw material and adds necessary additives (including heat stabilizers, processing aids, lubricants, etc.) to form a piping system. The connection method mainly adopts two methods: special glue bonding and rubber ring expansion socket.
PE water and gas pipelines gradually emerged with the development of special materials for high-density polyethylene (HDPE) pressure pipelines in the late 1980s. By adding comonomers butene, hexene, etc. in the polymerization, the long-term compressive performance of polyethylene materials is improved. The connection methods of PE pipes are mainly hot-melt socket, hot-melt butt joint and electro-fusion connection.
PP-R pipeline is the random copolymerization of PP-R by adding ethylene monomer with a content of not more than 2% during the preparation process of PP raw material and propylene. The low-temperature brittleness of ordinary PP is improved, and the long-term hydrostatic strength and high-temperature resistance of the product are improved at the same time. The connection of PP-R pipe mainly adopts hot-melt socket connection.
Aluminum-plastic composite pipe is a composite pipe of metal and plastic. The inside and outside are plastic layers, and the middle is an aluminum layer. The plastic and aluminum layers are bonded with a hot melt adhesive layer in the middle. The connection of aluminum-plastic pipes is generally connected by copper parts.
Double-wall corrugated pipes and winding pipes are also relatively well-developed plastic pipe varieties in my country. They belong to structural wall pipes, and the difference from ordinary solid wall pipes lies in the presence of inner and outer wall structures. Mainly used for buried drainage or communication pipelines, the diameter can be more than 3m.
The inner wall is a smooth structure in order to meet the needs of conveying fluid, and the outer wall is made into a corrugated or hollow structure in order to meet the needs of buried ground and resist external pressure. Structural wall pipes can save raw materials while meeting the requirements of use. Compared with the same solid wall pipes, structural wall pipes can save 30%-50% of raw materials. The raw material can be PVC or HDPE. The connection mainly includes rubber ring sealing connection, heat shrinkable band welding and so on.
In addition to the above-mentioned plastic pipes, some other plastic pipes include jacket pipes for power transmission and chlorinated polyvinyl chloride (PVC-C) for chemical purposes, acrylonitrile butadiene styrene copolymer (ABS) ) Pipes, PE pipes and HDPE silicon core pipes used for optical fiber and communication sheathing, polyphthalamide pipes used in the automobile, mechanical and pneumatic industries, and cross-linked polyethylene (PE-X) pipes used for floor heating , Polybutene (PB) pipes and heat-resistant PERT pipes, etc.
With the development of the “four sections” of energy saving, water saving, material saving and land saving in the whole society, it will promote a larger application market for plastic pipes. Many opportunities such as pipe network transformation, sewage treatment, and water pipe network design to increase sewage reuse in buildings will further promote the promotion and application of plastic pipes.
The European Plastic Pipe Manufacturing Association (TEPPFA) has promised to use 250,000 tons of recycled materials per year in 2020. European sponsors may in the near future mandate the use of recycled materials to replace more pure raw materials.
At present, part of the pipeline recycled materials are used in non-pipeline and part of non-pressure pipelines, and the use of recycled materials is still not allowed in all pressure piping systems. Multi-layer piping systems will become a possible application area for recycled materials. Co-extruded multi-layer pipes that partially use recycled materials have similar durability compared to traditional pipes.
In the process of upgrading new plastic pipe products, modified materials and new materials will appear faster. The processing of single materials gradually shifts to modified composite materials to improve certain characteristics or comprehensive performance of the pipeline. At the same time, advanced engineering installation technologies such as trenchless technology, underwater laying technology, sand-free laying technology, and large-diameter pipeline connection technology will be widely used.
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