Halogen-free flame-retardant ethylene paste plasticizing process

Abstract

The invention provides a halogen-free flame-retardant ethylene paste plasticizing process. Raw materials comprise 82 to 105 parts of polyethylene resin particles, 0.5 to 2 parts of polypropylene, 45 to 62 parts of an inorganic flame retardant, 0.5 to 1.5 parts of an initiator, 12 to 15 parts of a plasticizer, 20 to 25 parts of a dispersant, 2 to 3 parts of nano copper oxide, 6 to 8 parts of an antioxidant and 42 to 65 parts of special conductive carbon black. The plasticization is performed by steps of ultrasonic cleaning, preliminary mixing, plastifying, mixing and energizing. According to the halogen-free flame-retardant ethylene paste plasticizing process, the nano copper oxide and the special conductive carbon black are added into the raw materials, and then the energizing procedure isadded after the mixing procedure, so that the light transmittance of a subsequent macromolecular material is greatly increased, and the application range of a subsequent polyethylene product in the field having a relatively high light transmittance requirement is expanded.

Description

technical field [0001] The invention belongs to the technical field of polymer material production, and specifically relates to a plasticizing process of a halogen-free flame-retardant vinyl paste. Background technique [0002] Polyethylene, what we usually call plastic, is a polymer material formed by the polymerization of ethylene monomers. It is a kind of organic polymer material that was produced late and developed rapidly. It has light weight, non-toxicity, and good insulation. It has excellent properties such as chemical corrosion resistance, and is mainly used for making agricultural, video and industrial packaging films, wire and cable coatings and coatings, etc. Due to its low price and wide application in production and life, the flame retardant properties of polyethylene polymer materials have become particularly important. [0003] Those skilled in the art have found through a large number of scientific researches that the flame retardancy of polyethylene can be...

AI Technical Summary

Problems solved by technology

[0003] Those skilled in the art have found through a large number of scientific researches that the flame retardancy of polyethylene can be achieved in the following ways: 1. Terminate the free radical chain reaction, replenish the active free radicals that transmit the combustion chain reaction, such as halogen flame retardant However, when it is flame retardant, it generates a large amount of smoke and produces a large amount of corrosive gas and toxic gas, which is not good for fire extinguishing, escape and recovery work; 2. Absorb the heat generated by thermal classification and reduce the system temperature, such as aluminum hydroxide, hydrogen Magnesium oxide and boric acid inorganic flame retardants; but their flame retardant effect is not good, in order to achieve a good flame retardant effect, the dosage must be increased, and a large dose of flame retardants will lead to a decrease in the mechanical properties of the matrix, and it will interact with ethylene Poor compatibility, it needs to be modified before use 3. Dilute the concentration of flammable substances and oxygen concentration to make it below the fire limit, and play a gas phase flame retardant effect, such as nitrogen-based flame retardants; but its The carbonization effect is not good; 4. Promote the carbonation of polymers, reduce the generation of flammable gases, and form a layer of homogeneous carbon layer with fluffy suction holes on the surface of the material, which plays a role in heat insulation, oxygen insulation, smoke suppression and prevention of melting. The role of drops to achieve the purpose of flame retardant, such as phosphorus flame retardants, but its fluidity is strong, the amount of smoke is large, easy to hydrolyze and poor thermal stability

[0004] Since any flame retardant alone cannot achieve a good flame retardant effect, those skilled in the art usually use several flame retardants in combination, and in order to achieve a good flame retardant effect, the flame retardant The dosage will increase accordingly within a reasonable range. The properties of each flame retardant are different. The combination of multiple flame retardants added to the organic matrix will inevitably lead to a decrease in its transparency, which will affect the apparent performance.

Images