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Current market situation analysis of thermoplastic pipes
[China Building Materials Network] Current status of thermoplastic pipes on the market
1. The current status of thermoplastic pipes on the market
Thermoplastic pipes on the market are generally divided into two categories, one is a single-material plastic pipe, and the other is a metal and plastic composite pipe.
1.1 Single material plastic pipe
1.1.1 Polyvinyl chloride pipe (PVC)
Unplasticized unplasticized polyvinyl chloride pipe (UPVC) is mainly used in water supply and drainage pipes, which is usually used in cold water pipes. In addition, chlorinated polyethylene pipe (CPVC) is a plastic pipe with good heat resistance obtained by processing vinyl chloride resin. It has good heat resistance, aging resistance, and chemical corrosion resistance. It is especially suitable for conveying heat. Water, sewage, waste liquid and other media.
UPVC pipes can usually be bonded with adhesives, or flexible connection with rubber rings. This kind of pipe is the first plastic pipe to be promoted and used in China and the most used at present. .
The pipe is available within Φ16-710mm.
1.1.2 Polyethylene pipe (PE)
PE pipes are distinguished by density. There are low density polyethylene pipes (LDPE), medium density polyethylene pipes (MPVC), and high density polyethylene pipes (HDPE).
LDPE pipe has good flexibility, elongation, impact resistance, chemical resistance and high frequency insulation. It is mainly used for farmland irrigation and drainage. HDPE pipe has high strength and rigidity. MDPE pipe also has good flexibility and creep resistance. The latter two pipes, especially HDPE pipes, are widely used in urban gas and water supply pipelines.
In the national standard of PE pipe products for water supply, the pipes are divided into three grades: PE63, PE80, and PE100. They can maintain the minimum strength of 6.3MPa, 8.0MPa, and 10.0MPa after 50 years at 20°C. The maximum allowable design stress is 5MPa, 6.3MPa, and 8MPa respectively. At present, the specifications of domestic products are between Φ16-160mm, and the maximum can reach Φ400mm.
1.1.3 Cross-linked polyethylene pipe (PEX)
Cross-linked polyethylene is a chemical or physical method to modify the linear molecular structure of ordinary polyethylene into a three-dimensional cross-linked network structure, which has excellent temperature adaptability (-70-110°C) and pressure resistance (burst pressure 6MPa ), stability and durability (service life of more than 50 years), and has the advantages of non-toxic, no bacteria breeding. However, the cross-linked polyethylene pipe contains water for a long time and has a slight peculiar smell. Cross-linked polyethylene pipes are mainly used for indoor hot water pipes and ground radiant heating pipes. The supply specifications of domestic PEX pipes are between Φ10-32mm, and a small amount can reach Φ63mm. The connecting pipe fittings generally use clamped copper joints or snap ring copper joints, but also ABS pipe fittings, POM pipe fittings, and ultra-high molecular polyethylene pipe fittings.
1.1.4 Modified polypropylene pipe
Polypropylene pipe (PP) is non-toxic and inexpensive, but has poor impact strength. It is not ideal as a water supply pipe. Polypropylene is modified by copolymerization to improve the impact strength of the pipe. There are three types of modified polypropylene pipes, namely, homopolymer polypropylene pipe (PP-H), block copolymer polypropylene pipe (PP-B), and random copolymer polypropylene pipe (PP-R). This kind of pipe is soft, easy to install, good sealing, corrosion resistant and long service life. The pipe fittings are connected by welding. PP-R pipe is the third generation of modified polypropylene. It uses random copolymerization to make PE randomly and uniformly polymerize in the PP molecular chain. It has better impact resistance, temperature change resistance and creep resistance than PP-B.变性。 Variable performance. Mainly used for indoor hot water pipes and ground radiation heating systems. The current domestic product specifications are between Φ20-63mm.
1.1.5ABS tube
ABS tube is a thermoplastic composed of three monomer copolymers of acrylonitrile, butadiene and styrene. It has the characteristics of high quality and durability. Among them, acrylonitrile has heat resistance, aging resistance, and chemical resistance; butadiene has the properties of impact resistance, high toughness, and low temperature characteristics; styrene has the characteristics of easy construction and smooth pipe surface. The pipe fittings are connected by cold glue welding method, which is generally used for indoor hot water pipes and water treatment dosing pipes.
1.1.6 Polybutene pipe (PB)
Polybutene is a kind of high molecular inert polymer, it has high temperature resistance (can be used safely between -20℃～95℃), durability, chemical stability, plasticity, and unique creep resistance Performance, tasteless and mirrorless. There are three ways to connect B pipe and fittings, namely copper joint clamping connection, hot-melt plug-in connection, and electric fusion connection. Mainly used in indoor hot and cold water and heating pipes.
According to relevant reports, in the United States, where PB pipes were widely used in the 1970s, a series of rapid cracking blasting accidents occurred in the pipeline in the past decade. It is still unclear whether this accident is caused by the pipe itself or the quality of the pipe fittings made of polyoxymethylene. The United States has banned the promotion of the use of such pipes, which should arouse our attention.
1.2 composite pipe
1.2.1 Aluminum-plastic composite pipe (PAP)
Aluminum-plastic composite pipe is a new type of composite pipe manufactured by extrusion molding process. It is composed of polyethylene layer (or cross-linked polyethylene)-adhesive layer-aluminum layer-adhesive layer-polyethylene layer (or cross-linked Polyethylene) five-layer structure. Among them, the aluminum layer is formed by lap welding and butt welding. The pipe fittings are mainly clamped copper joints, which are used in indoor cold and hot water pipes and floor radiation heating systems. The specifications currently available on the market are between Φ14～32mm.
Article source: China Building Materials Network www.bmlink.com
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While adding stabilizers to improve the chemical stability and strength of pvc pipes, the sound insulation performance of the plastic itself has been greatly weakened. Therefore, in the current situation of reliable mechanical performance of pvc drainage pipes, how to solve the problem of sound insulation and noise reduction has become a top priority. The author believes that we can start with the noise source and adopt the following improvement measures to improve its sound insulation performance:
①It is made into double-wall hollow sound-proof PVC drainage pipe
The special equipment for PVC pipe extrusion is modified, an intermediate mold is added between the inner and outer jacket, and the outer mold is modified to increase the intermediate distance to form a hollow cavity between the two walls, so that the plasticity of PVC will not be changed. But it can increase the damping of the pipe along the flow direction, thereby increasing
Strong sound insulation effect.
Using single-wall double-material PVC pipe
On the basis of the original single-wall PVC pipe, a secondary formula is carried out, that is, the porous sound-absorbing material formed by plastic foaming technology is used to increase the wall thickness to achieve the purpose of increasing the damping along the outer wall direction, so as to obtain a good sound insulation effect. A set of equipment needs to be added, thus increasing the manufacturing cost.
Muffled PVC drainage pipe
The PVC pipe is made into a muffled drainage pipe with spiral fins attached to the inner wall. At this time, its outer wall is still a PVC hard plastic pipe (to ensure the required strength of the drainage pipe), but a certain width of flexible and strong soft is attached to the inner wall Plastic spiral belt, which unloads part of the impact pressure of the water flow onto the spiral belt, thereby buffering the pipe wall.
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What is the difference between PVC water supply pipe and PVC drainage pipe
1. Different purposes: one for water supply and one for drainage. PVC water supply pipes are mainly used for: a. Indoor water supply and reclaimed water systems for civil and industrial buildings; b. Buried water supply systems for residential quarters and factories; c. Urban water supply pipeline systems; d. Water treatment plant water treatment pipeline systems; e. Marine aquaculture; f. Garden irrigation, well sinking and other industrial pipes. PVC drainage pipes are mainly used for building drainage and domestic sewage drainage.
2. Different specifications: PVC water supply pipes have more specifications and models, and PVC drainage pipes have relatively fewer specifications and models, because the drainage system itself does not require too many specifications. Even with the same model (outer diameter), the wall thickness of the water supply pipe and the drain pipe are often different, because the water supply pipe requires pressure, and the drain pipe usually does not need to consider the pressure.
3. The price is different: This will not be explained in detail, and the specific price can be consulted by each manufacturer.
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