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Details
The substance corresponding to 9003-53-6 is polyvinyl chloride (Polyvinyl Chloride, abbreviated as PVC). Here is a detailed description:
Basic Information
- Chemical Structure: It is formed by the free radical polymerization of vinyl chloride monomer (VCM). It is a linear high-molecular polymer with a large number of chlorine atoms on the molecular chain. Its chemical formula can be expressed as (C?H?Cl)?.
- Appearance: Depending on the polymerization process and additives, the appearance varies. Unplasticized polyvinyl chloride (rigid PVC) is a white powdery or granular solid with high hardness; plasticized polyvinyl chloride (flexible PVC) can present a flexible film-like, sheet-like or other molded product forms.
- Physical Properties
- Density: The density of rigid PVC is generally between 1.35 - 1.45g/cm³. For flexible PVC, due to the addition of plasticizers and other additives, the density is between 1.15 - 1.35g/cm³.
- Glass Transition Temperature (Tg): Approximately 80 - 85℃. Below Tg, PVC presents a glassy state with high hardness and brittleness; above Tg, it gradually becomes soft.
- Solubility: It is insoluble in water and difficult to dissolve in most organic solvents such as ethanol and acetone at room temperature, but it can be dissolved in specific organic solvents such as cyclohexanone and tetrahydrofuran.
Main Uses
- Construction Field: It is one of the most widely used plastic building materials, used to manufacture door and window profiles, pipes (such as drainage pipes, water supply pipes, threading pipes, etc.), waterproofing membranes, decorative panels, etc. PVC pipes have the advantages of strong corrosion resistance, light weight, and convenient installation; PVC door and window profiles have good heat insulation and sound insulation properties.
- Packaging Industry: It is made into various packaging materials. For example, PVC films are used for the packaging of food, medicine, and daily necessities, which can play the role of moisture prevention, oxidation prevention, and extending the shelf life; PVC sheets can be made into packaging boxes, blister shells, etc. through processes such as blister and injection molding.
- Electronics and Electrical Appliances Field: It is used as the insulating layer and sheath material of wires and cables, which can effectively prevent current leakage and external interference, and also has good flame retardancy; it is also used to manufacture electrical enclosures, sockets, switches and other components.
- Clothing and Home Furnishing Field: Flexible PVC can be made into artificial leather for the surface decoration of clothing, bags, furniture, etc.; it can also be used to make various household items such as floor mats, bathroom mats, curtains, etc.
- Medical Field: Some medical devices such as infusion bags, blood bags, catheters, etc. will use PVC materials. However, due to the possible release of harmful substances (such as the plasticizer phthalate esters) during its production and use, its application in the medical field has been restricted to a certain extent in recent years.
Production Method
It is mainly through suspension polymerization, emulsion polymerization, bulk polymerization, and microsuspension polymerization. The suspension polymerization method is the most commonly used method. In the aqueous phase, vinyl chloride monomer undergoes polymerization reaction under the action of initiators, dispersants, etc., and the generated PVC particles are suspended in water, and the finished product is obtained after processes such as filtration and drying.
Safety and Environmental Impact
- Safety: Polyvinyl chloride itself is non-toxic, but the plasticizers, stabilizers and other additives added during the processing may have potential safety hazards. For example, phthalate plasticizers may interfere with the human endocrine system.
- Environmental Impact: PVC is not easy to degrade naturally, and discarded PVC products will cause white pollution; incinerating PVC will produce highly toxic substances such as dioxins, which will cause serious harm to the environment and human health. However, at present, there are some recycling and treatment technologies, such as physical recycling and chemical recycling, to reduce the impact of PVC waste on the environment.
See More Isooctyl stearate Properties
Hazard Identification
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Handling and Storage
Precautions for safe handling
Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.
Conditions for safe storage, including any incompatibilities
Store the container tightly closed in a dry, cool and well-ventilated place. Store apart from foodstuff containers or incompatible materials.
See More Isooctyl stearate Safety Data Sheet
China (Mainland)