High glow wire polycarbonate composition

Abstract

The invention discloses a high glow wire polycarbonate composition, which consists of the following components in percentage by weight: 40-80% of polycarbonate, 5-50% of organopolysiloxane-polycarbonate block copolymer, 1-15% of acrylonitrile-butadiene-styrene, 1-25% of a flame retardant, 0.10-2.00% of an anti-dripping agent and 0.01-0.30% of an antioxidant. In order to solve the problem of insufficient carbonation of polycarbonate, organopolysiloxane-polycarbonate block copolymer is combined with acrylonitrile-butadiene-styrene to improve carbonation and fluidity at the same time; and GWIT israised above 875 DEG C, so that the composition has both physical strength and fluidity, makes materials conform to safety regulations, and expands the application in European and American markets.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high glow wire polyamide composition. Background technique [0002] Recently, electronic and electrical equipment tends to be lighter and thinner, which makes the coil current easy to overload and heat up, and it is too close to the shell to ignite and cause fire. The International Electrotechnical Commission (IEC) proposes new standards for such fires. IEC60335-1 clearly specifies that there is no The GWFI of supervised electrical appliances (current>0.2 ampere) must be at least ≧850°C, and the GWIT must be at least ≧775°C. However, electrical fires are still frequent, so Europe, the United States and other countries have put forward safety regulations requiring GWIT to be at least ≧850°C . At present, polycarbonate or alloy materials are mostly used for electrical casings. After burning polycarbonate or alloy materials, there are not many carbonized ...

AI Technical Summary

Problems solved by technology

[0002] Recently, electronic and electrical equipment tends to be lighter and thinner, which makes the coil current easy to overload and heat up, and it is too close to the shell to ignite and cause fire. The International Electrotechnical Commission (IEC) proposes new standards for such fires. IEC60335-1 clearly specifies that there is no The GWFI of supervised electrical appliances (current>0.2 ampere) must be at least ≧850°C, and the GWIT must be at least ≧775°C. However, electrical fires are still frequent, so Europe, the United States and other countries have put forward safety regulations requiring GWIT to be at least ≧850°C

At present, polycarbonate or alloy materials are mostly used for electrical casings. After burning polycarbonate or alloy materials, there are not many carbonized layers. After burning, there are problems such as flame dripping or burning time is too long, which makes it impossible to meet the above requirements. Need to overcome the defects of flame dripping and burning time too long

[0003] Chinese patent application CN102241881A mentioned the PC / ABS alloy of halogen-free flame-retardant high-glow wire and its preparation method. The compounding of phosphorus-nitrogen flame retardants can increase the GWIT to 850°C, but the disadvantages of phosphorus-nitrogen flame retardants In order to reduce the physical strength, the impact strength is only about 570J / m, and the temperature resistance of phosphorus nitrogen fire retardant is poor, and it is easy to generate gas gas during processing to cause surface defects

The patent application of CN102382442A mentions in the semi-permeable high glow wire ignition temperature polycarbonate composite material and its preparation method that the GWIT reaches 850°C by fluorine-based and silicon-based synergists, which improves the problem of insufficient temperature resistance, but The impact strength is only 540J / m, and the use of PC as the base material will reduce the fluidity, and it may be difficult to process thin products

Images