Halogen-free reaction extruded expansible flame-proof polythene comprising organic metal complex and its preparation method

Abstract

The invention discloses a non-bittern reaction squeezing-typed bulging flame-proof polyethylene and making method with organic metal complex compound, which comprises the following parts: 65-75 percent polyethylene, 24.9-34.9 percent built reaction squeezing-typed bulging combustion inhibitor and 0.1-1 percent organic metal complex compound. The invention possesses high combustion inhibitor effect, which is fit for large scale manufacturing.

Description

1. Technical field [0001] The invention belongs to the technical field of polyolefin flame retardant products and their preparation. Specifically, the invention relates to a non-toxic polyolefin compound containing organic metal complexes and compounded reactive extrusion type intumescent flame retardants with higher flame retardant efficiency. Halogenated polyethylene and its preparation method. 2. Background technology [0002] Polyethylene (PE), as one of the most widely used general-purpose plastics, is widely used in packaging, construction, transportation, home decoration, and wire and cable due to its light weight, low toxicity, and good electrical insulation and mechanical properties. industry. However, because of its low limiting oxygen index, it is extremely flammable, which seriously affects its wide application in high flame retardant grades. Therefore, improving the flame retardancy of polyethylene has always been a research direction of scientific and technol...

AI Technical Summary

Problems solved by technology

Unfortunately, although halogenated flame retardants have the advantages of less addition and significant flame retardant effect, they used to occupy a dominant position in flame retardant polyethylene, but when they burn and decompose, they will produce toxic and shielding gases, and some brominated Aromatic flame retardants also produce highly toxic brominated dibenzoxanes and brominated dibenzofurans when burned, which not only pose a threat to human life, but also pollute the environment, and have been gradually abandoned; inorganic Hydroxides have a wide range of sources and are cheap, but their flame retardant efficiency is low. Usually, the addition amount in polyolefins needs to reach 50-70% to have a flame retardant effect. Due to the poor compatibility between inorganic hydroxides and polyolefins , in the case of such a large amount of addition, it will undoubtedly affect the physical and mechanical properties of the material; and intumescent flame retardants, such as Mi Renxi in "New Developments in Intumescent Flame-Retardant Polyethylene" ("Flame Retardant Materials and "Technology" 1992 (4): 15), the treatment of polyethylene with phosphorus-polyol-cresol formaldehyde resin introduced in the article, and the polyaryl phosphate oligomerization introduced in the book "Flame Retardant Materials and Application Technology" edited by Wang Yongqiang flame-retardant polyethylene; US4966931 discloses selecting or using melamine-modified ammonium polyphosphate and 1,3,5-triazine derivatives to form an intumescent non-halogen flame retardant polypropylene or polyethylene, Xu Jingjing said in " Research progress of phosphorus-based halogen-free flame retardants" ("Colloids and Polymers" 2005 (23): 39) introduced the application of ammonium polyphosphate in polyolefin flame retardant, although treated with these intumescent flame retardants The final polyethylene exhibits low-smoke, non-toxic, good flame-retardant effect and certain droplet resistance, but there are still problems of one kind or another to varying degrees: such as the flame-retardant effect is not ideal enough, and the droplet resistance is not enough. It needs to be improved, and the amount of flame retardant added is relatively large, because the hygroscopicity of ammonium polyphosphate will have a negative impact on the flame retardant performance, etc.

Although the self-synthesized pentaerythritol ester flame retardant is contained in the compound intumescent flame retardant, the addition amount of ammonium polyphosphate and melamine phosphate is reduced, and the adverse effect of the hygroscopicity of ammonium polyphosphate on the flame retardancy of the material is reduced. The efficiency of the flame retardant is improved, coupled with the synergistic flame retardant effect produced by the organometallic complex and the compound intumescent flame retardant, not only greatly improves the oxygen index flame retardant performance of the polyethylene material, but also greatly improves the performance of the polyethylene material. The vertical burning property of droplet resistance solves the problem that it is difficult for polyethylene materials to achieve high flame retardant levels required in the electrical and construction industries. However, the synthesis of pentaerythritol ester flame retardants requires many process steps, long preparation cycles, and difficult operation. More complex, not suitable for industrial production

Images