The invention and application of plastic pipes is a revolution in the global pipeline industry. It is used to replace the traditional pipes such as cast iron pipes, galvanized steel pipes and cement pipes. It solves the problems of secondary pollution and chemical corrosion protection of drinking water and effectively protects groundwater resources from pollution. Compared with traditional cast iron pipes, galvanized steel pipes and cement pipes, plastic pipes have the advantages of energy saving, environmental protection, light weight, high strength, corrosion resistance, smooth inner wall without scaling, simple construction and maintenance, long service life, etc. They can be widely used in building water supply and drainage, urban and rural water supply and drainage, urban gas, electric power and optical cable sheath, industrial fluid transportation, agricultural irrigation and other construction industries. Municipal, industrial and agricultural fields.
The domestic and foreign economic situation is complex and changeable, the market demand continues to be weak, the whole plastic industry performance is low, but with domestic housing construction and municipal engineering stabilizing domestic demand, water conservancy construction policy vigorously supporting, rural drinking water safety system construction and building materials going to the countryside to promote the upgrading of plastic pipe demand, gas supply system and heating consumption trend demand increment, the plastic pipe industry still performance. Good momentum of development has been achieved.
In recent years, the dosage of crosslinked polyethylene (PE-X), ultra-high molecular weight polyethylene (UHMWPE), heat-resistant polyethylene (PE-RT), modified polyvinyl chloride (pvc-M) and other materials has increased rapidly; pipes with different raw materials, such as solid-wall pipes, corrugated pipes, ribbed pipes, winding pipes, core foamed pipes, spiral pipes, etc., have been continuously developed and applied; domestic practical new models and patents for plastic pipes have exceeded 1500. Item: UHMWPE pipes, steel-plastic composite winding pipes for large diameter drainage, plastic-metal composite pipes and so on have a certain international advanced level.
However, in the process of high-speed development, there are also excess capacity, homogeneity of products, large proportion of general and middle-grade products, imperfect product standard system and raw materials such as domestic special resins and auxiliaries that can not meet production needs. Some functional pipeline products such as FPVC, PVC-O PVC pipe, high-pressure reinforced thermoplastic pipe (RPT), winding fusion increase. There are many problems in the production technology of strong PE pressure pipe and self-reinforced PE pipe, such as the obvious gap between foreign countries and so on.