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PVC
What is PVC and what are its uses?
Polyvinyl chloride or PVC is one of the thermoplastic polymers that is produced in hard and flexible form. PVC is considered one of the most valuable and widely used products in the petrochemical industry, and its uses are unlimited. PVC is widely used in the construction industry due to its reasonable price and easy use. Today, PVC has become a suitable alternative to traditional materials such as wood, cement and clay in construction.
What are the uses of PVC?
Vinyl siding
• Magnetic sign of smart cards
• Vertical cutting of windows
• Gramophone records
• Construction of pipes, channels and equipment that can be installed
• Cheap bags
• Windows without view
• Production of clothes and household appliances such as curtains
• Flooring and roof construction
• Covering electric wires and cables
• Low weight game balls
• Water and sewage piping
How is PVC produced?
PVC, like polyethylene and polypropylene, is one of the most widely used polymers. This material can be easily combined with additives and softeners and structures with different characteristics can be produced from it; Including soft and flexible films to hard parts.
PVC has a reasonable price and high processability, so its use is increasing. PVC can be produced by extrusion methods (for the production of pipes, cables, profiles, granulation, etc.), rotary coating (ball production), immersion (glove production) and usual injection-pressure methods (for the production of technical and complex) produced.
Introduction of PVC additives
PVC has low thermal stability and is also a hard polymer, for its processing and also to modify the properties of the final product, it is necessary to use additives in the formulation of PVC.
The combination of PVC with additives is called compound and the process of its preparation is called compounding.
Note: PVC compounding is done in two ways: compounding-melt and solid compounding. In compound-solid, the materials are mixed together in a suitable mixer, which is in the form of a liquid mixture (in PVC paste-solvent and latex) or in the form of a solid mixture, in which case it is also called dry blend, which is in the form of a mixture It turns out uniform and so-called free-flowing.
In compounding, the molten PVC and additive after mixing by different equipment (usually PVC double extruder) are granulated and used for processing in the next step. In fact, PVC granule is also an intermediate product like PVC compound.
The compound produced in the next step enters the main process (extrusion-injection-calendering-blow extrusion, etc.) and finally the final product is made from it.
(pipe – profile – sheet – wall covering – cable – PVC leather, etc.) In some cases, this product may be an intermediate product and become a final product by another process, for example, film and sheets produced in the process Calendering may be converted into the final product in later stages (for example, by thermoforming process).
PVC composition components:
Lubricant
Softener
Thermal stabilizer
Optical stabilizer
Antioxidants
shiny
Process help
Impact modifier
Pigments
What is the effect of dop oil in the granule industry?
One of the best ways to recycle and reuse PVC products is to turn them into granules. Granule is a special form of polymer that is produced in the form of small grains and has various uses. In the process of converting PVC into granules, various additives are added to it. The purpose of this work is to increase the resistance and have a better color and shape in the final product. One of the most important additives that are added to granule compositions is DOP oil.
Among the various additives that are added to the polymer for various uses and production of different products, dop oil is one of the most important additives. This oil, which is a type of softener, is used to increase the flexibility and at the same time the resistance of the granule and to soften it. Further on this page, we introduce this oil more. We also discuss its role and impact in the granule industry
Features of this oil
DOP oil has various features that make it welcome by producers and expand its uses. Among its features are:
Insolubility in water:
One of the characteristics of DOP oil is that it does not dissolve in water. Depending on the application of the granule produced with this oil, this property can be both good and bad. But the fact that this oil does not pollute the water chemically and does not cause poisoning is considered an advantage. Apart from that, due to the large use of this oil to produce granules used in hose and cable making, not dissolving in water is both an advantage and a necessity.
light color:
Another advantage of dop oil is its bright color. The bright color makes the texture of the granule soft and flexible and gives it a suitable formability, without changing the color of the product. Many additives used in the granule industry have color and this will have a negative effect on the final colorability of the produced product.
Odorless:
One of the problems in the granule industry and petrochemical industry in general is the unpleasant smell of the additives and materials used. Fortunately, this oil has no smell and therefore there is no restriction in its use.
Dissolving in mineral oils:
dop oil dissolves in mineral oils. Considering the use of various types of these oils in the granule production process, the possibility of dissolving DOP oil is an advantage; Because it is difficult to combine with other oils