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Anonymous users2024-01-24PVC material is a kind of plastic decorative material, is the abbreviation of polyvinyl chloride material, PVC (Polyvinyl Chloride, referred to as PVC) resin is a thermoplastic polymer polymer polymerized by vinyl chloride monomer (Vinyl Chloride Monomer, referred to as VCM). It is made of polyvinyl chloride resin as the main raw material, adding an appropriate amount of anti-aging agent, modifier, etc., through mixing, calendering, vacuum blister and other processes. PVC is an amorphous polymer containing microcrystals with a crystallinity of 5%-10% (melting point 175 degrees).
The physical energy of PVC, such as molecular weight, crystallinity, and softening point, varies with the polymerization reaction conditions (temperature). PVC resin plastic is made by plasticizing and molding with a variety of additives such as stabilizers, plasticizers, fillers, colorants and modifiers. PVC material has the characteristics of lightweight, heat insulation, heat preservation, moisture-proof, flame retardant, and easy construction.
There are many specifications, colors, patterns, and they are highly decorative, and are widely used in production and life. For example, PVC water pipes, PVC plastic doors and windows, as well as plastic toys containing PVC, wires and cables. Due to its harm to the human body, Europe, Japan, South Korea and other countries have imposed restrictions on products using PVC as raw materials.
The outstanding advantages of general PVC resin plastic products are flame retardant, wear-resistant, chemical corrosion-resistant, low gas and water vapor, and good leakage. In addition, it is a general-purpose material with the most superior energy-to-price ratio due to comprehensive mechanical energy, product transparency, electrical insulation, heat insulation, sound reduction, and shock absorption. The defect is that it is thermally stable and has poor impact resistance, and it is easy to produce brittleness during the use of both hard and soft PVC.
Generally, PVC contains bis(2-ethylhexyl) adipate (DEHA) plasticizer that is not allowed to be used by relevant national standards, and DEHA is easy to be released at high temperatures (more than 100 degrees Celsius), which is harmful to health after contact with the human body. Because PVC is a hard plastic, to make it soft, a large amount of plasticizer must be added, and the plasticizer is easily released in a heated environment. If DEHA is used, it can interfere with the body's endocrine system, causing breast cancer in women, birth defects in newborns, decreased sperm count in men, and even mental illness.
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I and Yiyi's dad night light is not on, and the other functions are fine, this is the bulb is broken and replaced with a bulb.
L is connected to the live wire, and the remaining 4 are directly connected with the wire, and the exhaust sound is loud and the air intake sound is small.
Hurry up and turn off the power to carry out relevant inspections, first look at the line to see if there is any exposed and leakage place, generally speaking, it is your own electrical appliances. If there is a malfunction, please check it in time for repair or replacement. so as not to cause safety accidents. I hope it can help you, please adopt.
Simple, first reserve the position and size of the integrated ceiling, and then install wooden strips around the reserved position of the integrated ceiling, so that the old-fashioned bath bomb can be raised on the integrated ceiling, pay attention to the wooden strips to be fixed on the keel of the integrated ceiling.