With the rapid development of petrochemical industry and the continuous progress of plastic processing technology, various plastic products have been more and more widely used in national production and people's daily life since the 1950s and 1960s, and quite a few of them have become the best substitutes for traditional materials. Compared with traditional metal pipes and cement pipes, plastic pipes are light in weight (only1/6 ~110 of metal pipes), corrosion-resistant, low in water flow resistance (the energy consumption of water delivery is reduced by more than 5%), good in comprehensive energy saving (the energy consumption of manufacturing is reduced by 75%), convenient in transportation and installation, and long in service life (30.
According to the statistics of China Plastics Processing Industry Association, at present, the annual growth rate of plastic pipes in China has reached 15%, ranking first in the world, which has aroused widespread concern in the industry. This development speed is gratifying, which indicates the huge market capacity and the prosperity of the whole industry. At the same time, with the rapid development of plastic pipe industry in recent years, the varieties of plastic pipe are also increasing.
In recent years, the number of plastic pipe production enterprises in our province is also increasing, but most enterprises still have a big gap with developed provinces in plastic industry in production scale and technology. The following only describes the plastic pipes and fittings that can be produced in our province from the following aspects.
1. What are the main types, present situation and application fields of plastic pipes in our province?
(1) rigid polyvinyl chloride (PVC-U) pipe?
This kind of pipe is mainly used for urban water supply, urban drainage, building drainage, building water supply and other transportation pipelines, wire and cable sleeves, etc. At present, our province is mainly used for water supply and drainage pipelines and rainwater pipelines in buildings. ?
1. Rigid PVC pipe for water supply?
There are few manufacturers in our province. With the decrease of the usage of this kind of pipe (generally less than ∮ 1 10) in buildings, the large-diameter pipe (more than ∮200) is mainly used for outdoor water supply pipes, and there are only two or three small manufacturers, so the production situation is not ideal. In our province, rigid PVC pipes are often replaced by polyethylene water supply pipes with better performance because of their own weaknesses. ?
2. Rigid PVC pipes for drainage?
It is one of the varieties with large dosage, including:
(1) Ordinary solid wall rigid PVC pipe?
This kind of pipe is the earliest plastic pipe used for building drainage, and it is still in use at present. There are about a dozen production enterprises in our province, most of which use "raw materials" to produce pipes (light color), and some enterprises use recycled materials to produce raw materials (generally gray). Solid-wall rigid PVC pipes are also used for rainwater pipes for building external drainage, but their formula and product performance requirements are different from those for building internal drainage. ?
(2) Core foamed rigid PVC pipe?
This kind of pipe is a kind of hard PVC pipe developed and applied several years ago. Compared with ordinary solid wall rigid PVC pipes, they are light in weight and have a certain noise reduction effect, so they are widely used in drainage pipes in buildings and are popular for a while. However, the current consumption is gradually decreasing, because the noise reduction effect of this pipe is not ideal (unless it is specially made), and the market is chaotic, and there are many inferior products. There are nearly ten production enterprises in our province, the production scale is not large, and some of them are now in a state of suspension or semi-suspension. ?
(3) Single-wall and double-wall inner spiral rigid PVC pipes and double-wall rigid PVC pipes
These pipes make the varieties of hard PVC pipes developed in recent two years have the advantages of good noise reduction effect (especially double-wall spiral hard PVC pipes) and better noise reduction effect and high strength when used with soft pipes in the inner layer. Although the price is relatively expensive, it has been recognized and accepted by users who pursue high quality, and the development prospect is good. Generally, the double-wall inner spiral rigid PVC pipe is used together with the double-wall rigid PVC pipe, and the double-wall inner spiral rigid PVC pipe is used as the main pipe of the riser. The representative manufacturer is Harbin Building Plastics Factory. ?
3. Rigid PVC pipe for wire and cable bushing?
There are several manufacturers in our province, and some manufacturers use the leftover materials of door and window profiles to produce this kind of pipe, which is mainly used in construction projects. ?
(2) polyethylene (PE) pipe?
Polyethylene (PE) pipes are mainly used for transportation pipelines such as city gas, city water supply, city drainage and building water supply. ?
1. Ordinary polyethylene pipe?
This is one of the most traditional plastic pipes, which can be divided into high density polyethylene (HDPE), low density polyethylene (LDPE) and linear low density polyethylene (LLDPE) according to the different raw materials used. HDPE pipes are mainly used for water supply pipes, rural drilling pipes and outer sheath pipes of communication cables. LDPE pipes are mainly used for water supply pipes and farmland irrigation pipes. There are many production enterprises in our province, all over the cities and counties of the province, with large production capacity, but small output. Moreover, there are many small-caliber pipes (∮ 1 10mm or less) and few large-caliber pipes. Daxing Plastic Products Co., Ltd. has a production line introduced in the 1980s to produce PE pipes with diameters less than 800 mm.. ?
2. Crosslinked polyethylene pipe?
Crosslinked polyethylene pipes are mainly divided into silane crosslinked polyethylene pipes, peroxide crosslinked polyethylene pipes and irradiation crosslinked polyethylene pipes. The first two kinds of pipes have manufacturers in our province. Due to the popularity of floor radiant heating in the cold area of northern China, crosslinked polyethylene pipes have developed rapidly in recent 1 ~ 2 years, and the number of manufacturers has been increasing, especially the peroxide crosslinked polyethylene pipes have less investment in production equipment and low product prices, which quickly occupy the market. There are more than a dozen enterprises producing crosslinked polyethylene pipes in our province, most of which are peroxide crosslinked polyethylene pipes. ?
3. Polyethylene pipe is wound on the structural wall?
According to the different product structure after winding, it can be divided into several types. The most common products are pipes similar to double-walled corrugated pipes, which are mainly used for drilling wells in rural areas. There are many production enterprises in our province, mainly in Harbin, with pipe specifications below 600 mm, and the other is a double-walled pipe with smooth inner and outer walls, which is mainly used for municipal drainage. At present, there are only two or three production enterprises, and the production scale is not large. The pipeline specification is less than ∮ 1500mm. Another company is introducing a pipe with a diameter of ∮ 2,000mm, which has a very broad application prospect in the municipal field. The main manufacturers of the above two kinds of pipes are Harbin Special Plastic Products Co., Ltd.. ?
4. Polyethylene double-walled corrugated pipe?
At present, there are only a few small-diameter polyethylene double-walled corrugated pipe manufacturers in our province, which are mainly used for the casing of communication cables. Large-diameter high-density polyethylene extruded double-wall corrugated pipe has been introduced into the production line, and a production enterprise is setting up a project, the main application field is municipal drainage.
5. Flame retardant polyethylene for wire and cable casing?
It is made of low density polyethylene as raw material, and is extruded by adding flame retardant or flame retardant masterbatch, which is mainly used for wire and cable sleeves in buildings. Many manufacturers, including 1 ~ 2 large enterprises, mostly use recycled polyethylene as the main raw material, and some enterprises also produce counterfeit flame retardant pipes. ?
6. High-density polyethylene outer protective tube for thermal insulation pipeline?
This kind of pipe is used as the outer protective pipe of polyurethane foam prefabricated directly buried thermal insulation pipe, which is mainly used for municipal heating pipeline. There are nearly ten enterprises in our province that produce polyurethane foam prefabricated directly buried insulation pipes. Most enterprises produce polyethylene outer protective pipes and insulation pipes, and the maximum diameter of polyethylene outer protective pipes is about ∮1000 mm. ..
7. Polyethylene pipes for gas pipelines?
This kind of pipe was developed and used earlier, and it is mainly used for gas pipelines outside buildings. The production requirements of this pipe are strict, and the raw material used is medium density polyethylene (MDPE), which needs to be imported. There are 2 ~ 3 main production enterprises in our province, and the production scale is not large. ?
8. Silicon core tube?
Silicon core pipe is a kind of pipe made of high density polyethylene (HDPE) and silicon-containing materials, which is mainly used for the sleeve of optical fiber communication cable. There are only 2 ~ 3 production enterprises in our province, and one enterprise in Daqing uses imported equipment to produce silicon core tubes. ?
(3) Polypropylene pipes?
Polypropylene pipes can be divided into three categories: 1. Homopolypropylene (PP-H) is also called type I polypropylene; 2. Block copolymer polypropylene (PP-B) is also called type II polypropylene; 3. Random copolymerized polypropylene (PP-R) is also called type III polypropylene. PP-B pipe and PP-R pipe are varieties developed and rapidly applied in recent years, which are mainly used for building water supply (cold and hot water) pipes. There are few enterprises producing PP-H pipes in our province, but PP-B pipes and PP-R pipes have experienced a period of rapid growth in recent two years, so enterprises should add these two pipes first. At present, there are more than a dozen production enterprises in our province, but the production scale is not large, the production situation is good and bad, and the market is chaotic. Enterprises with relatively large production scale and using imported raw materials mainly include Mudanjiang Huaneng Plastic Steel Manufacturing Co., Ltd.
(4) Composite plastic pipe?
1. aluminum-plastic composite pipe?
Aluminum-plastic composite pipes are divided into lap welded aluminum-plastic composite pipes and butt welded aluminum-plastic composite pipes, both of which are produced in our province. Aluminum-plastic composite pipe has experienced ups and downs in the whole country, and so has our province. A few years ago, during the boom, several enterprises in our province were producing, but now there are very few normal production. Moreover, the only imported aluminum-plastic composite pipe production line in Zhaodong, our province, has not been in normal production since it was put into production this year. ?
2. Steel wire reinforced composite pipe?
This kind of pipe is made of steel wire and plastic by winding or weaving, including:
(1) Small diameter steel wire reinforced composite pipe?
This kind of pipe is made of steel wire woven into plastic pipe and then compounded with plastic. It can be divided into polyethylene steel wire reinforced composite pipe and crosslinked polyethylene steel wire reinforced composite pipe. At present, it can produce pipes with pipe diameters less than ∮75mm, which are mainly used in high-pressure resistant pipeline systems and high-temperature resistant heating pipeline systems. Only Heilongjiang Xingye Plastic Products Co., Ltd. produces this kind of pipe in our province. ?
(2) Large diameter steel wire reinforced polyethylene composite pipe for water supply?
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