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Learn PPR, understand PPR!
Source:Baidu Encyclopedia | Author:wxyanyang | Published time: 2014-11-02 | 1187 Views | Share:

Basic introduction:

PP-R English name is polypropylene random (copolymer), PP-R is short for polypropylene random copolymer, has also been used for cooling water pipes and hot water dedicated transport material. PP-R pipe called three polypropylene tubes, random copolymer polypropylene, using random copolymer polypropylene can be extruded into the pipe through, can also be injection molded into the tube. A polypropylene is a polypropylene random copolymer, which is the basic structure of the polymer chain to be modified by the addition of different types of monomer molecules. Ethylene is the most commonly used monomers, which cause changes in the physical properties of polypropylene. Homopolymers compared pp, random copolymers improved optical properties (increased transparency and reduced haze), improved impact resistance, increased flexibility, and reduce the melting temperature, thus reducing the temperature of the thermal fusion ; while the chemical stability, water vapor barrier properties, and organoleptic properties (low taste and odor) is substantially the same aspects of the homopolymer. For use in blow molding, injection molding, film and sheet extrusion processing areas, as food packaging materials, pharmaceutical packaging materials and consumer staples.

PPR Development:
PPR pipe Compared with traditional cast iron pipe, galvanized steel, cement pipes and other pipes, with energy and materials, environmental protection, lightweight, high strength, corrosion resistance, smooth wall without fouling, simple construction and maintenance, long life and other advantages, widely used in building water supply and drainage, urban and rural construction, municipal, industrial and agricultural areas of water supply and drainage, city gas, electricity and cable jacket, industrial fluid transport, agriculture and irrigation.
In recent years, with the construction, municipal engineering, water conservancy, agriculture and industrial sectors increasing market demand, China PPR pipe industry has shown a trend of rapid development. According to the survey, 2009 plastic pipe production capacity of 5.804 million tons, an increase of 18.9% from January to September 2010 production of 5.528 million tons of plastic pipe, an increase of 28.23%. Meanwhile, with consumer products and environmental protection, health, durability and other aspects of the quality requirements continue to increase, China's plastic pipe production increased at the same time, the continuous improvement of product quality, technological progress continues to accelerate industry, brand-scale enterprises continue to increase, new materials, new structures are emerging varieties, advanced system design concepts emerging, product functionality more obvious applications to be further widened. Analysts believe that China is currently the proportion of plastic pipe market share in all of the pipeline has been over 30%.

To 2015, the country new construction, renovation, expansion project, 85% building sewer plastic pipes, building rainwater drains 80 percent of the plastic tube, plastic tube city sewer usage reaches 50%, building water supply, hot water supply and heating pipes 85% plastic pipe, city water pipe (DN400mm below) 80% of the plastic pipe, rural water supply pipe 90% of the plastic tube, city gas plastic pipe (low pressure tube) to reach 40% of the amount of applications, building wire threading sheathing 90% of the plastic tube. It is predicted that the production of plastic pipe of five-second period will remain at around 10% growth rate, to 2015, the national production capacity is expected to be close to 12 million tons of plastic pipes, plastic pipes in various national market share of over pipeline 60%.
PP-R pipe called a total of three types of polypropylene pipes, polypropylene random copolymer, random copolymer polypropylene by using extruded into tubing, injection molded into the tube. Europe in the early 1990s the development and application of new plastic pipe products. PP-R is the late 1980s, the use of gas-phase copolymerization process makes about 5% PP molecular chains of polymerized uniformly at random (random copolymer) and a new generation of pipe materials. High strength, impact resistance and has good long-term creep properties. Meanwhile pipe has excellent resistance to chemical corrosion, is not soluble at room temperature, in any known solvent, in addition to the decoration, is more suitable for chemical transport of chemical fluids other places. Life of up to 50 years, the market does not have any kind of cheaper materials can replace it.

Types of uses:
PP-R Aluminum steady plastic tube:
Steady aluminum plastic pipe product set metal pipe and plastic pipe advantages in one, suitable for conveying medium temperature is high, equipped with special oxygen barrier and clear conditions required for a wide range of applications, especially for doing surface mounted radiator heating system pipes.
Decoration PP-R hot and cold water:
PPR piping systems meet the water needs of home improvement under normal conditions of use, can be widely used in all kinds of home improvement feedwater piping systems.

Chemical structure:
PP random copolymer of ethylene molecules typically containing 1- 7% (wt.) And 99- 93% (by weight) of the propylene molecules. In the polymer chain, and ethylene molecules randomly inserted into the middle of propylene molecules. In such a random or statistical copolymers, the majority (typically 75%) of the single molecule of ethylene is incorporated into the insert, called the X3 group (three consecutive ethylene [CH2] are sequentially arranged in the main {TodayHot} chain), which can also be seen as an ethylene molecule inserted in the middle of two propylene molecules.
Another 25% of the ethylene molecule is inserted into the multi-way integrated into the main chain, also known as X5 group, because there are five consecutive methylene groups (two ethylene molecules together two propylene molecules inserted in the middle). X5 is difficult to distinguish, and higher groups, such as X7, X9 and so on. In view of this, the XS and higher ethylene content group together statistics for> X3%.
Randomness ratio X3 / X5 can be measured. X3 more groups when the percentage is large, it will significantly reduce the crystallinity of the copolymer, the final properties of the random copolymer which is a great influence. Very high levels of ethylene in the copolymer of polymer crystallinity, similar to the effects of high when the random polypropylene content.

PP random copolymer differs from homopolymer because of random insertion of the ethylene polymer backbone hinder the crystal-type arrangement of molecules of the polymer molecule. Reduced crystallinity of the copolymer is changed due to the physical properties of: a random copolymer with a PP homopolymer reduced stiffness compared to improve impact resistance, better transparency. The ethylene copolymer as well as lower melting temperature, which has become their advantages when applied in certain areas.
Random copolymer may contain more leather extract and random PP, as well as a much higher ethylene content polymer chain. This higher extract content can be leather, depending on the polymerization process, to varying degrees in all commodities copolymer material and meet the Federal Food Administration (FDA) for food contact regulations on {HotTag} cause difficulties.

Material properties:
Physical properties:Generally, a random PP copolymer to PP homopolymer and good flexural rigidity is low. Them when the temperature dropped 32 ° F, but also to maintain a moderate impact strength, and when the temperature dropped to -4 ° F, will be limited usefulness. Flexural modulus (1% secant modulus of strain) copolymer is in the range of 483 ~ 1034MPa, and the homopolymer in the range of 1034 ~ 1379MPa. Effect of molecular weight of the PP copolymer material is not as rigid PP homopolymer is large. Izod notched impact strength is generally within 0.8 to 1.4 ft · lb / inch.
Chemical properties:PP random copolymer acid. Action of a base, an alcohol, a low-boiling hydrocarbon solvents and many organic chemicals have a strong resistance. At room temperature, PP copolymer is essentially insoluble in most organic solvents. Moreover, when exposed to soap, lye soap. Aqueous reagents and alcohols, they are not like many other polymers that would happen environmental stress cracking damage. When in contact with certain chemicals, especially liquid hydrocarbons. Chlorinated organics and strong oxidizing agents, can cause surface cracks or swelling. Non-polar compounds are generally more readily than the polar compound is absorbed by the polypropylene. Only the molecules of carbon, hydrogen, no harmful toxic elements are present.
Barrier properties:PP homopolymers and copolymers have a very low water vapor permeability (0.5 g / ml / 100 square inches / 24 hours). These properties can be improved by orientation. Stretch blow molded polypropylene bottles have already improved resistance to water vapor permeability to 0.3, oxygen permeability to 2500.
Electrical properties:Generally, polypropylene has good electrical properties, including: high dielectric strength, low dielectric constant and low dissipation factor; however, the general choice homopolymer power applications.

Material properties:
PP-R pipe as a new pipe, has the following characteristics:
1, the production energy saving PP-R pipe is only 20% of steel, and its low thermal conductivity [0.2W / (mK)], is only 1/200 of steel pipe, used in hot water systems will greatly reduce heat loss.
2, corrosion, scaling, health, wall using non-toxic PP-R pipe can be removed using a galvanized steel caused by fouling, water rust caused by the "secondary pollution." Because PP-R component simple, basic ingredients for carbon and hydrogen, in line with food hygiene regulations, non-toxic, more suitable for potable water delivery.
3, heat, pressure, temperature and long life of long-term use of PP-R pipes up to 95 ℃, short-term use temperature up to 120 ℃. The temperature is 70 ℃, working pressure of 1.2MPa conditions, long-term continuous use, life expectancy up to 50 years.
4, lightweight, high strength, fluid resistance PP-R pipe density is only 1/8 of the metal pipe, resistant to pressure test the strength of up 5MPa, and good toughness, impact resistance. The smooth wall, no rust, no scaling, fluid resistance. The main technical indicators PP-R pipes are as follows: density of 0.9g / cm3 elastic modulus (20 ℃) 800MPa thermal expansion coefficient of 1.8 × 10-4 / K thermal conductivity of 0.2W / (mK) longitudinal shrinkage of 2% impact hydraulic test short-term trials ≤10% breakage rate 1h, hoop stress 16MPa no leakage of long-term 95 ℃, 1000h, hoop stress 3.5MPa no leakage table 1 performance comparison of several pipe material.
PP-R pipe in addition to general plastic tube with a light weight, corrosion resistant, non-scaling, long life and other characteristics, but also has the following main features:
1, non-toxic, and health. PP-R materials only molecules of carbon, hydrogen, no harmful toxic elements exist, reliable health, not only for the hot and cold water pipes, but also for pure drinking water systems.
2, thermal insulation. PP-R pipe thermal conductivity of 0.21w / mk, steel is only 1/200.
3, preferably heat resistance. Vicat softening point of PP-R pipe 131.5 ℃. The maximum operating temperature up to 95 ℃, can meet the construction requirements specification drainage water heating systems.
4, long life. PP-R pipe in the working temperature of 70 ℃, working pressure (PN) 1.OMPa conditions, the service life of up to 50 years; at room temperature (20 ℃) life of up to 100 years.
5, easy to install, reliable connection. PP-R has good weldability, pipes, fittings can be hot melt and fused connection, easy installation, the joint firm, its parts is greater than the strength of the connection strength of the pipe itself.
6, the material is recyclable. PP-R waste by cleaning, after crushing recycling in pipe, tube production. The amount of recycled material does not exceed 10% of the total, does not affect product quality.

Main purpose:
1, building hot and cold water systems, including central heating systems;
2, building heating systems, including flooring, siding and radiant heating systems;
3, can be directly purified drinking water supply systems;
4, Central (central) air-conditioning systems;
5, transfer or discharge of chemical mediators and other industrial piping systems.

Selection principles:
1, note the use of the pipeline overall coefficient C (ie safety factor) to determine:
General situations, and long-term continuous so that the temperature <70 ℃, optional C = 1.25; on important occasions, and the long-term continuous use temperature ≥70 ℃, and possibly a long time to run at higher temperatures, optional C = 1.5;
2, for the cold water (≤40 ℃) system, the choice of P.N1.0 ~ 1.6MPa pipes and fittings; for hot water system used ≥PN2.0MPa pipes and fittings.
3. After considering the above three principles, pipe fittings shall be not more than SDR SDR pipe wall thickness of the pipe that is not less than the same size pipe wall thickness.