A kind of flame-retardant hdpe tube and its preparation method

Abstract

The invention discloses a flame-retardant HDPE sub-pipe and a preparation method thereof, belonging to the technical field of plastic product processing. A flame-retardant HDPE sub-pipe comprises the following components in parts by weight: 60-70 parts of HDPE resin, modified 20-25 parts of permanent aluminum hydroxide, 4-6 parts of flame retardant synergist, 3-5 parts of lubricant and 1-2 parts of antioxidant; the modified aluminum hydroxide is made from the following raw materials in parts by weight: 50-60 parts of aluminum hydroxide, 6-8 parts of medical stone powder, 1-2 parts of glycerol monostearate, 100-120 parts of isopropyl alcohol and 1-2 parts of titanate coupling agent. The modified aluminum hydroxide of the present invention can improve its compatibility with HDPE resin, so that while improving the flame retardancy of the HDPE sub-pipe, the mechanical properties of the sub-pipe will not be significantly reduced.

Description

technical field [0001] The invention relates to the technical field of plastic product processing, in particular to a flame-retardant HDPE sub-pipe and a preparation method thereof. Background technique [0002] HDPE (High Density Polyethylene) is a white powder or granular resin with good wear resistance, electrical insulation, toughness, cold resistance and anti-aging properties. It can be used as a cable insulation material. The tube is located on the outer layer of the cable, which has the function of protecting the cable and preventing the cable from being damaged; however, due to the low oxygen index of HDPE, it is flammable and will produce a large number of molten droplets with ignition ability when it burns, which will further aggravate the burning. Therefore, flame retardant treatment of HDPE materials is required. [0003] At present, the most effective way to flame retardant HDPE is to add flame retardants. Flame retardants are generally divided into halogen-bas...

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Problems solved by technology

[0002] HDPE (High Density Polyethylene) is a white powder or granular resin, which has good wear resistance, electrical insulation, toughness, cold resistance and anti-aging properties, and can be used as cable insulation materials. Cables made of HDPE The tube is located on the outer layer of the cable, which has the function of protecting the cable and preventing the cable from being damaged; however, due to the low oxygen index of HDPE, it is flammable and will produce a large number of molten droplets with ignitable ability when it burns, which will further aggravate the combustion Therefore, it is necessary to carry out flame retardant treatment on HDPE materials

[0003] At present, the most effective way to flame-retardant HDPE is to add flame retardants, which are generally divided into halogen-based flame retardants and halogen-free flame retardants; compared with halogen-free flame retardants, the addition of halogen-based flame retardants is small , the flame retardant effect is good, it will not reduce the mechanical properties and electrical properties of polymer materials, but the disadvantage of halogen flame retardants is that they will volatilize and produce a large amount of toxic gases at high temperatures, which will affect the environment and cause harm to human health. ; Although halogen-free flame retardants do not produce toxic gases, their flame retardant effect is far inferior to that of halogen-based flame retardants. To achieve the same flame retardant effect, a large amount of halogen-free flame retardants must be added, and halogen-free flame retardants The compatibility with polymers is poor, and after a large amount of addition, the mechanical strength of HDPE sub-pipes will be greatly reduced, and its service life will be reduced

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