| abstract |
The invention relates to a scratch-proof flame-retardant polypropylene composition with low sink mark for an appliance socket, which comprises the following raw materials calculated according to parts by mass: 100 parts of polypropylene, 1 to 20 parts of flame retardant, 1 to 10 parts of flame-retardant synergist, 1 to 20 parts of inorganic filler, 1 to 10 parts of master batches of a foaming agent, 0.2 to 5 parts of scratch-proof agent, 0.2 to 1 part of antioxidant and 0.2 to 0.5 part of processing aid. A preparation method comprises the following steps of: firstly, weighing each component except for the master batches of the foaming agent according to a proportion, adding into a double-screw extrusion machine from a feeding port at the speed of 60 to 200g/min after mixing fully, controlling the rotating speed of screws at 100 to 500 revolutions/minute, setting a heating area of the double-screw extrusion machine at 160 to 250 DEG C, extruding, granulating so as to obtain a semi-finished product and blending the semi-finished product and the master batches of the foaming agent so as to obtain the scratch-proof flame-retardant polypropylene composition with the low sink mark. The composition disclosed by the invention has low cost and good flame retardance, thermal stability and scratch-proof performance; and moreover, the sink mark is not obvious after the composition is formed. |