What you need to know about PVC and PVC pipes
Polyvinyl chloride (PVC) is a widely used plastic. At present, it is one of the most valuable products of the petrochemical industry. Generally more than 50% of man-made PVC is used in construction; Because PVC is cheap and easy to bond.
In recent years, PVC has replaced traditional building materials such as wood, cement and pottery in many areas. Despite the emergence of an ideal material in construction, there are still concerns about the cost of PVC for the natural environment and human health.
Many uses for PVC include: vinyl siding, magnetic card marking, vertical window cutting, turntables, pipes, plumbing, ducts and fixtures, inexpensive bags, dark windows (invisible) and in soft form for There are clothes, furniture or accessories such as curtains, flooring and roofing, electrical cable casings, light play balls.
It is also a material that is often used for water and sewage piping due to its natural cheapness and flexibility.
Writing Shaping Techniques
Mixing different materials is done by these mixers. Of course, it should be noted that there is a possibility of practical problems in mixing stabilizers, lubricants, pigments and باید their amount should be relatively small.
They are usually of the type of sheet making machines.
Includes one or more rotary drill screws.
To make long sheets of rubber and thermoplastics, softened resin is passed between two or more cylinders.
Shaping at low pressure:
Molding by pressure and injection is very fast and is used to prepare molded objects with small and medium dimensions Injection molding, extrusion and thermal forming are other methods.
Polyvinyl chloride was accidentally discovered in two small locations in the 19th century. First in 1835 by the artist Victor Regnalt and in 1872 by Eugene Bowman. In both cases the polymer was exposed when the white solid inside the vinyl chloride flask was exposed to sunlight.
Polyvinyl chloride is formed by the polymerization of vinyl chloride monomer. Commercial production of most PVC is mainly done by suspension polymerization and less mass and emulsion polymers are used and solution polymerization is rarely used.
Polyvinyl chloride has a low crystallinity but is strong due to the large polymer chains (the result of large chlorine extraction). The TG is high at 81 ° C, but the TG is not high enough to interfere with the process in a variety of ways. It is relatively unstable to heat and light and emits hydrogen chloride.
This substance has detrimental effects on the properties of hand objects (electrical components) in addition to physiological effects. PVC is a hard plastic that becomes soft and flexible by the addition of lubricants. The most commonly used is phthalate.
Prior to the twentieth century, Russian chemists Ivan Strae Mislensky and Fritz Klit of the German electron chemistry company Grishim both tried to use PVC in commercial products, but problems with the process, hardness and sometimes fragility of the polymer thwarted their efforts. In 1926, BF Goodrich of Waldo Simon developed a method of softening PVC by mixing it with various additives. The result was flexible materials that were easy to process and soon became popular in commercial applications.
U-PVC (Unplasticized Polyvinyl Chloride)
There are also by-products that are extruded profiles based on high impact resistance polyvinyl chloride (PVC) that have a white exterior surface and are used in the construction of doors and windows used in the exterior wall of the building.
Profiles can be made entirely of raw materials or have a core of waste or recycled material that can be coated with hard PVC and coagulated.
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