Flame retardant plastics
There are many flame retardant grade plastics, which are prepared by modification on the basis of raw materials, such as flame retardant ABS, flame retardant HIPS, flame retardant PP, flame retardant PE, flame retardant PET, flame retardant PBT, flame retardant PC, flame retardant PC/ABS alloy, and so on. Now there are still many halogen-free flame retardant studies, but the product stability and flame retardant effect need to be improved. The test methods of flame retardant materials mainly include: the commonly used test methods of flame retardant materials, including horizontal and vertical combustion method, oxygen index method, NBS smoke box method, thermal analysis method, cone calorimeter method, etc. The simplest way is to burn directly, to see directly whether it will extinguish or continue to burn, the burning time and so on.
Flame retardant PP, flame retardant PE, flame retardant PC, flame retardant PA, flame retardant ABS, flame retardant PBT, flame retardant PET, flame retardant masterbatch, and many more! Polybutylece terephthalate (PBT) is a milky translucent to opaque crystalline thermoplastic polyester. It has high heat resistance, toughness, fatigue resistance, self-lubrication, low friction coefficient, low weather resistance and water absorption, only 0.1%. It still maintains various physical properties (including electrical properties) and electrical insulation in wet environment, but its volume resistance and dielectric loss are large. Resistance to hot water, alkali, acid, oil, but vulnerable to halogenated hydrocarbons erosion, poor hydrolysis resistance, rapid crystallization at low temperature, good formability. The disadvantages are low notch impact strength and high shrinkage. Therefore, most of them are modified by glass fiber reinforced or inorganic filling. Their tensile strength and bending strength can be more than doubled, and the thermal deformation temperature can be greatly increased. It can work for a long time at 140 C. The longitudinal and transverse shrinkage of glass fiber reinforced products are inconsistent, which makes the products warp easily.
PBT crystallization speed is fast, the most suitable processing method is injection moulding, other methods are extrusion, blow moulding, coating and various secondary processing moulding, pre-drying before moulding, moisture content to be reduced to 0.02%. PBT (enhanced and modified PBT) is mainly used in automotive, electronic and electrical appliances, industrial machinery, polymer alloys and blending industries. For example, as the distributor, body parts, igniter coil skeleton, insulation cover, exhaust system parts, motorcycle igniter, electronic and electrical industries such as TV deflection coil, picture tube and potentiometer bracket, sound output transformer skeleton, adapter skeleton, switch connectors, fans, refrigerators, washing machine end caps, axle sleeves. In addition, there are transport machinery parts, sewing machine and textile machinery parts, clock shell, mirror barrel, electric iron cover, mercury lampshade, baking oven parts, electric tool parts, shielding sleeve and so on. The test methods of flame retardant materials mainly include: the commonly used test methods of flame retardant materials, including horizontal and vertical combustion method, oxygen index method, NBS smoke box method, thermal analysis method, cone calorimeter method, etc. The simplest way is to burn directly, to see directly whether it will extinguish or continue to burn, the burning time and so on.
