Phthalic anhydride appears as a colorless to white lustrous solid in the form of needles with a mild distinctive odor. Moderately toxic by inhalation or ingestion and a skin irritant. Melting point 64°F Flash point 305°F. Forms a corrosive solution when mixed with water. Used in the manufacture of materials such as artificial resins.
Phthalic anhydride is the cyclic dicarboxylic anhydride that is the anhydride of phthalic acid. It has a role as an allergen. It is a cyclic dicarboxylic anhydride and a member of 2-benzofurans.
Phthalic anhydride is one of the most important organic chemical raw materials. Its main derivatives are dibutyl phthalate, dioctyl phthalate and diisobutyl acrylate. It is used as a plasticizer for PVC; it can also be used to produce unsaturated poly Ester resin, alkyd resin, dyes and pigments, various paints, food additives, laxatives in medicine, phenolphthalein, imipenem in pesticides, bentazone and sodium saccharin. Used as an analytical reagent and also for organic synthesis.
Storage Condition:
Phthalic Anhydride,Phthalic Anhydrid,99.5% Phthalic Anhydride,Plasticizer Mf C8H4O3 SHANDONG S-SAILING CHEMICAL CO,LTD , https://www.sdqh-chem.com
2.Used in the paint industry;
3.Insulation paint and glass fiber reinforced plastics;
4.Drugs.
How does a doorbell work?
A doorbell works by using a combination of a transformer and solenoid, along with electromagnetism, to create sound or light when the switch is activated. In wired doorbells, pressing the button completes an electrical circuit, sending current through wires to a terminal that activates a bell or chime, resulting in the familiar "ding" sound. Wireless doorbells use radio signals to trigger the doorbell sound, and some systems include a light to indicate signal reception.
Whether it's a traditional bell or a modern sound mechanism, understanding how a doorbell works involves knowing how the push switch, wire, and circuit interact. If any component fails, replacement may be necessary for proper function. The basic principle remains the same: pressing the button completes the circuit, allowing electricity to flow and activate the sound mechanism.
An electric wired doorbell operates through an electrical circuit that becomes active when the doorbell button is pressed. This allows power to reach the chimes or bell, producing the typical "ding" or "ring" sound. Some electronic doorbells also have a light that signals the button press has been registered. These systems are usually powered by batteries or connected to household wiring.
The electromagnetic principle plays a key role in how a doorbell functions. When the button is pressed, it closes the circuit, allowing current to flow through a transformer, which reduces the voltage to a safe level. This activates a solenoid with an iron core, creating a magnetic field that pulls a striker or hammer to hit the bell or chime, producing the sound.
In wireless doorbells, pressing the button sends a signal to a receiver via a transmitter. The receiver then activates the sound mechanism, often an electronic chime or recorded bell sound. These systems offer greater flexibility in installation since they don’t require extensive wiring.
Doorbells work through the interaction between electric current, magnetic fields, and mechanical movement. When the button is pressed, the circuit is completed, triggering the chime or bell. This process is fundamental to alerting occupants of someone at the door.
Power for a doorbell typically comes from the home’s electrical system through a transformer, which steps down the high voltage to a safer level. In wired systems, two wires connect the button to the transformer and chime unit. Pressing the button completes the circuit, causing the bell to ring. Wireless doorbells, on the other hand, use batteries and radio signals instead of direct electrical connections.
Doorbells produce sound by using the magnetic field from an electromagnet to activate a mechanism that strikes a bell or tone plate. The button press triggers this process, causing the striker to hit the chimes, resulting in the ringing sound. If a doorbell isn't working, it might be due to a faulty component.
Modern wireless doorbells operate on batteries and do not require a transformer, making them easier to install. They send a signal to a receiver, which then triggers the sound mechanism. Smart doorbells add features like video cameras and smartphone connectivity, enhancing home security and convenience.
Touching doorbell wires is generally safe because they operate on low voltage, usually around 16-24 volts. However, it's important to turn off the power before handling any components to avoid shocks or damage. Proper installation and maintenance ensure the doorbell functions correctly and safely.
Phthalic Anhydride(IPA) Application:
1.Plasticizer;
Appearance & Physical State:
white crystalline solid with choking odour
Density:
1.53
Melting Point:
129-132ºC
Boiling Point:
284ºC
Flash Point:
152ºC
Refractive Index:
1.646
Water Solubility:
6 g/L (20 ºC)
Vapor Pressure:
<0.01 mm Hg ( 20 °C)
Vapor Density:
5.1 (vs air)
Store at RT.