Halogen free flame-proof composite material of polythene and preparation method thereof

Abstract

The invention provides a halogen-free flame retardant polyethylene composite material, which is characterized by consisting of the following raw materials in weight portion: 74.3 to 41.5 portions of polyethylene; 0.2 to 1.5 portions of heat stabilizer; 0.3 to 1 portion of light stabilizer; 0.2 to 1 portion of processing aid; 23 to 50 portions of halogen-free flame retardant; and 2 to 5 portions of nanometer addition agent. The invention also provides a method for preparing the composite material. Compared with the prior halogen-free flame retardant polyethylene, the composite material greatly improves the flame retardant performance of polyethylene due to the addition of the nanometer addition agent, and reduces the usage of the halogen-free flame retardant; besides, the obtained polyethylene has better mechanical properties, smoother surface and faster extrusion.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant polyethylene composite material and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] Polyethylene (PE) is the thermoplastic plastic with the largest amount. It has excellent electrical insulation, low temperature resistance, easy processing and molding, excellent chemical stability and dielectric properties. It is widely used in films, daily necessities, pipes, wires and cables. application. The development of polyethylene in my country is very fast, with an average annual output growth rate of 11.55%. With the improvement of people's requirements for the performance of plastic products, the research and application of flame retardant polyethylene have also been developed rapidly. The early research on flame-retardant polyethylene mostly used halogen-containing flame retardants. This type of flame retardant has the advantages of g...

AI Technical Summary

Problems solved by technology

[0003] Domestic research on halogen-free flame-retardant polyethylene uses Al(OH) 3 , Mg(OH) 2 There are many studies on flame retardants, Al(OH) 3 , Mg(OH) 2 It is currently recognized as a flame retardant with three functions of flame retardancy, smoke suppression and filling. It has the advantages of non-toxic, non-corrosive, good stability, non-volatile, and does not produce toxic gases at high temperatures, and it is cheap. It has a wide range of sources, but as a flame retardant, it also has the disadvantages of large filling amount, decreased mechanical properties, and poor processability

Use Al(OH) alone 3 , Mg(OH) 2 As a flame retardant filled polyethylene, the oxygen index of flame retardant polyethylene increases with Al(OH) 3 , Mg(OH) 2 The filling amount increases and improves, but at low filling amount (less than 50%), the flame retardant effect is not obvious, and only a large amount of filling can achieve a certain flame retardant effect

Judging from the current research status of flame-retardant polyethylene in China, it is difficult for the flame-retardant and mechanical properties of a single halogen-free flame-retardant polyethylene to meet the requirements of the product at the same time, and the imported flame retardant is expensive, so in recent years, it is difficult to use Al (OH) 3 , Mg(OH) 2 More and more attention has been paid to the research of flame retardant synergistic system with synergistic effect

The polyethylene flame retardant synergists that have been studied more are mainly red phosphorus and phosphide, but the effect is not very significant during use.